1 /* 32-bit ELF support for ARM 2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 3 2008 Free Software Foundation, Inc. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "libiberty.h" 25 #include "libbfd.h" 26 #include "elf-bfd.h" 27 #include "elf-vxworks.h" 28 #include "elf/arm.h" 29 30 /* Return the relocation section associated with NAME. HTAB is the 31 bfd's elf32_arm_link_hash_entry. */ 32 #define RELOC_SECTION(HTAB, NAME) \ 33 ((HTAB)->use_rel ? ".rel" NAME : ".rela" NAME) 34 35 /* Return size of a relocation entry. HTAB is the bfd's 36 elf32_arm_link_hash_entry. */ 37 #define RELOC_SIZE(HTAB) \ 38 ((HTAB)->use_rel \ 39 ? sizeof (Elf32_External_Rel) \ 40 : sizeof (Elf32_External_Rela)) 41 42 /* Return function to swap relocations in. HTAB is the bfd's 43 elf32_arm_link_hash_entry. */ 44 #define SWAP_RELOC_IN(HTAB) \ 45 ((HTAB)->use_rel \ 46 ? bfd_elf32_swap_reloc_in \ 47 : bfd_elf32_swap_reloca_in) 48 49 /* Return function to swap relocations out. HTAB is the bfd's 50 elf32_arm_link_hash_entry. */ 51 #define SWAP_RELOC_OUT(HTAB) \ 52 ((HTAB)->use_rel \ 53 ? bfd_elf32_swap_reloc_out \ 54 : bfd_elf32_swap_reloca_out) 55 56 #define elf_info_to_howto 0 57 #define elf_info_to_howto_rel elf32_arm_info_to_howto 58 59 #define ARM_ELF_ABI_VERSION 0 60 #define ARM_ELF_OS_ABI_VERSION ELFOSABI_ARM 61 62 static struct elf_backend_data elf32_arm_vxworks_bed; 63 64 /* Note: code such as elf32_arm_reloc_type_lookup expect to use e.g. 65 R_ARM_PC24 as an index into this, and find the R_ARM_PC24 HOWTO 66 in that slot. */ 67 68 static reloc_howto_type elf32_arm_howto_table_1[] = 69 { 70 /* No relocation. */ 71 HOWTO (R_ARM_NONE, /* type */ 72 0, /* rightshift */ 73 0, /* size (0 = byte, 1 = short, 2 = long) */ 74 0, /* bitsize */ 75 FALSE, /* pc_relative */ 76 0, /* bitpos */ 77 complain_overflow_dont,/* complain_on_overflow */ 78 bfd_elf_generic_reloc, /* special_function */ 79 "R_ARM_NONE", /* name */ 80 FALSE, /* partial_inplace */ 81 0, /* src_mask */ 82 0, /* dst_mask */ 83 FALSE), /* pcrel_offset */ 84 85 HOWTO (R_ARM_PC24, /* type */ 86 2, /* rightshift */ 87 2, /* size (0 = byte, 1 = short, 2 = long) */ 88 24, /* bitsize */ 89 TRUE, /* pc_relative */ 90 0, /* bitpos */ 91 complain_overflow_signed,/* complain_on_overflow */ 92 bfd_elf_generic_reloc, /* special_function */ 93 "R_ARM_PC24", /* name */ 94 FALSE, /* partial_inplace */ 95 0x00ffffff, /* src_mask */ 96 0x00ffffff, /* dst_mask */ 97 TRUE), /* pcrel_offset */ 98 99 /* 32 bit absolute */ 100 HOWTO (R_ARM_ABS32, /* type */ 101 0, /* rightshift */ 102 2, /* size (0 = byte, 1 = short, 2 = long) */ 103 32, /* bitsize */ 104 FALSE, /* pc_relative */ 105 0, /* bitpos */ 106 complain_overflow_bitfield,/* complain_on_overflow */ 107 bfd_elf_generic_reloc, /* special_function */ 108 "R_ARM_ABS32", /* name */ 109 FALSE, /* partial_inplace */ 110 0xffffffff, /* src_mask */ 111 0xffffffff, /* dst_mask */ 112 FALSE), /* pcrel_offset */ 113 114 /* standard 32bit pc-relative reloc */ 115 HOWTO (R_ARM_REL32, /* type */ 116 0, /* rightshift */ 117 2, /* size (0 = byte, 1 = short, 2 = long) */ 118 32, /* bitsize */ 119 TRUE, /* pc_relative */ 120 0, /* bitpos */ 121 complain_overflow_bitfield,/* complain_on_overflow */ 122 bfd_elf_generic_reloc, /* special_function */ 123 "R_ARM_REL32", /* name */ 124 FALSE, /* partial_inplace */ 125 0xffffffff, /* src_mask */ 126 0xffffffff, /* dst_mask */ 127 TRUE), /* pcrel_offset */ 128 129 /* 8 bit absolute - R_ARM_LDR_PC_G0 in AAELF */ 130 HOWTO (R_ARM_LDR_PC_G0, /* type */ 131 0, /* rightshift */ 132 0, /* size (0 = byte, 1 = short, 2 = long) */ 133 32, /* bitsize */ 134 TRUE, /* pc_relative */ 135 0, /* bitpos */ 136 complain_overflow_dont,/* complain_on_overflow */ 137 bfd_elf_generic_reloc, /* special_function */ 138 "R_ARM_LDR_PC_G0", /* name */ 139 FALSE, /* partial_inplace */ 140 0xffffffff, /* src_mask */ 141 0xffffffff, /* dst_mask */ 142 TRUE), /* pcrel_offset */ 143 144 /* 16 bit absolute */ 145 HOWTO (R_ARM_ABS16, /* type */ 146 0, /* rightshift */ 147 1, /* size (0 = byte, 1 = short, 2 = long) */ 148 16, /* bitsize */ 149 FALSE, /* pc_relative */ 150 0, /* bitpos */ 151 complain_overflow_bitfield,/* complain_on_overflow */ 152 bfd_elf_generic_reloc, /* special_function */ 153 "R_ARM_ABS16", /* name */ 154 FALSE, /* partial_inplace */ 155 0x0000ffff, /* src_mask */ 156 0x0000ffff, /* dst_mask */ 157 FALSE), /* pcrel_offset */ 158 159 /* 12 bit absolute */ 160 HOWTO (R_ARM_ABS12, /* type */ 161 0, /* rightshift */ 162 2, /* size (0 = byte, 1 = short, 2 = long) */ 163 12, /* bitsize */ 164 FALSE, /* pc_relative */ 165 0, /* bitpos */ 166 complain_overflow_bitfield,/* complain_on_overflow */ 167 bfd_elf_generic_reloc, /* special_function */ 168 "R_ARM_ABS12", /* name */ 169 FALSE, /* partial_inplace */ 170 0x00000fff, /* src_mask */ 171 0x00000fff, /* dst_mask */ 172 FALSE), /* pcrel_offset */ 173 174 HOWTO (R_ARM_THM_ABS5, /* type */ 175 6, /* rightshift */ 176 1, /* size (0 = byte, 1 = short, 2 = long) */ 177 5, /* bitsize */ 178 FALSE, /* pc_relative */ 179 0, /* bitpos */ 180 complain_overflow_bitfield,/* complain_on_overflow */ 181 bfd_elf_generic_reloc, /* special_function */ 182 "R_ARM_THM_ABS5", /* name */ 183 FALSE, /* partial_inplace */ 184 0x000007e0, /* src_mask */ 185 0x000007e0, /* dst_mask */ 186 FALSE), /* pcrel_offset */ 187 188 /* 8 bit absolute */ 189 HOWTO (R_ARM_ABS8, /* type */ 190 0, /* rightshift */ 191 0, /* size (0 = byte, 1 = short, 2 = long) */ 192 8, /* bitsize */ 193 FALSE, /* pc_relative */ 194 0, /* bitpos */ 195 complain_overflow_bitfield,/* complain_on_overflow */ 196 bfd_elf_generic_reloc, /* special_function */ 197 "R_ARM_ABS8", /* name */ 198 FALSE, /* partial_inplace */ 199 0x000000ff, /* src_mask */ 200 0x000000ff, /* dst_mask */ 201 FALSE), /* pcrel_offset */ 202 203 HOWTO (R_ARM_SBREL32, /* type */ 204 0, /* rightshift */ 205 2, /* size (0 = byte, 1 = short, 2 = long) */ 206 32, /* bitsize */ 207 FALSE, /* pc_relative */ 208 0, /* bitpos */ 209 complain_overflow_dont,/* complain_on_overflow */ 210 bfd_elf_generic_reloc, /* special_function */ 211 "R_ARM_SBREL32", /* name */ 212 FALSE, /* partial_inplace */ 213 0xffffffff, /* src_mask */ 214 0xffffffff, /* dst_mask */ 215 FALSE), /* pcrel_offset */ 216 217 HOWTO (R_ARM_THM_CALL, /* type */ 218 1, /* rightshift */ 219 2, /* size (0 = byte, 1 = short, 2 = long) */ 220 25, /* bitsize */ 221 TRUE, /* pc_relative */ 222 0, /* bitpos */ 223 complain_overflow_signed,/* complain_on_overflow */ 224 bfd_elf_generic_reloc, /* special_function */ 225 "R_ARM_THM_CALL", /* name */ 226 FALSE, /* partial_inplace */ 227 0x07ff07ff, /* src_mask */ 228 0x07ff07ff, /* dst_mask */ 229 TRUE), /* pcrel_offset */ 230 231 HOWTO (R_ARM_THM_PC8, /* type */ 232 1, /* rightshift */ 233 1, /* size (0 = byte, 1 = short, 2 = long) */ 234 8, /* bitsize */ 235 TRUE, /* pc_relative */ 236 0, /* bitpos */ 237 complain_overflow_signed,/* complain_on_overflow */ 238 bfd_elf_generic_reloc, /* special_function */ 239 "R_ARM_THM_PC8", /* name */ 240 FALSE, /* partial_inplace */ 241 0x000000ff, /* src_mask */ 242 0x000000ff, /* dst_mask */ 243 TRUE), /* pcrel_offset */ 244 245 HOWTO (R_ARM_BREL_ADJ, /* type */ 246 1, /* rightshift */ 247 1, /* size (0 = byte, 1 = short, 2 = long) */ 248 32, /* bitsize */ 249 FALSE, /* pc_relative */ 250 0, /* bitpos */ 251 complain_overflow_signed,/* complain_on_overflow */ 252 bfd_elf_generic_reloc, /* special_function */ 253 "R_ARM_BREL_ADJ", /* name */ 254 FALSE, /* partial_inplace */ 255 0xffffffff, /* src_mask */ 256 0xffffffff, /* dst_mask */ 257 FALSE), /* pcrel_offset */ 258 259 HOWTO (R_ARM_SWI24, /* type */ 260 0, /* rightshift */ 261 0, /* size (0 = byte, 1 = short, 2 = long) */ 262 0, /* bitsize */ 263 FALSE, /* pc_relative */ 264 0, /* bitpos */ 265 complain_overflow_signed,/* complain_on_overflow */ 266 bfd_elf_generic_reloc, /* special_function */ 267 "R_ARM_SWI24", /* name */ 268 FALSE, /* partial_inplace */ 269 0x00000000, /* src_mask */ 270 0x00000000, /* dst_mask */ 271 FALSE), /* pcrel_offset */ 272 273 HOWTO (R_ARM_THM_SWI8, /* type */ 274 0, /* rightshift */ 275 0, /* size (0 = byte, 1 = short, 2 = long) */ 276 0, /* bitsize */ 277 FALSE, /* pc_relative */ 278 0, /* bitpos */ 279 complain_overflow_signed,/* complain_on_overflow */ 280 bfd_elf_generic_reloc, /* special_function */ 281 "R_ARM_SWI8", /* name */ 282 FALSE, /* partial_inplace */ 283 0x00000000, /* src_mask */ 284 0x00000000, /* dst_mask */ 285 FALSE), /* pcrel_offset */ 286 287 /* BLX instruction for the ARM. */ 288 HOWTO (R_ARM_XPC25, /* type */ 289 2, /* rightshift */ 290 2, /* size (0 = byte, 1 = short, 2 = long) */ 291 25, /* bitsize */ 292 TRUE, /* pc_relative */ 293 0, /* bitpos */ 294 complain_overflow_signed,/* complain_on_overflow */ 295 bfd_elf_generic_reloc, /* special_function */ 296 "R_ARM_XPC25", /* name */ 297 FALSE, /* partial_inplace */ 298 0x00ffffff, /* src_mask */ 299 0x00ffffff, /* dst_mask */ 300 TRUE), /* pcrel_offset */ 301 302 /* BLX instruction for the Thumb. */ 303 HOWTO (R_ARM_THM_XPC22, /* type */ 304 2, /* rightshift */ 305 2, /* size (0 = byte, 1 = short, 2 = long) */ 306 22, /* bitsize */ 307 TRUE, /* pc_relative */ 308 0, /* bitpos */ 309 complain_overflow_signed,/* complain_on_overflow */ 310 bfd_elf_generic_reloc, /* special_function */ 311 "R_ARM_THM_XPC22", /* name */ 312 FALSE, /* partial_inplace */ 313 0x07ff07ff, /* src_mask */ 314 0x07ff07ff, /* dst_mask */ 315 TRUE), /* pcrel_offset */ 316 317 /* Dynamic TLS relocations. */ 318 319 HOWTO (R_ARM_TLS_DTPMOD32, /* type */ 320 0, /* rightshift */ 321 2, /* size (0 = byte, 1 = short, 2 = long) */ 322 32, /* bitsize */ 323 FALSE, /* pc_relative */ 324 0, /* bitpos */ 325 complain_overflow_bitfield,/* complain_on_overflow */ 326 bfd_elf_generic_reloc, /* special_function */ 327 "R_ARM_TLS_DTPMOD32", /* name */ 328 TRUE, /* partial_inplace */ 329 0xffffffff, /* src_mask */ 330 0xffffffff, /* dst_mask */ 331 FALSE), /* pcrel_offset */ 332 333 HOWTO (R_ARM_TLS_DTPOFF32, /* type */ 334 0, /* rightshift */ 335 2, /* size (0 = byte, 1 = short, 2 = long) */ 336 32, /* bitsize */ 337 FALSE, /* pc_relative */ 338 0, /* bitpos */ 339 complain_overflow_bitfield,/* complain_on_overflow */ 340 bfd_elf_generic_reloc, /* special_function */ 341 "R_ARM_TLS_DTPOFF32", /* name */ 342 TRUE, /* partial_inplace */ 343 0xffffffff, /* src_mask */ 344 0xffffffff, /* dst_mask */ 345 FALSE), /* pcrel_offset */ 346 347 HOWTO (R_ARM_TLS_TPOFF32, /* type */ 348 0, /* rightshift */ 349 2, /* size (0 = byte, 1 = short, 2 = long) */ 350 32, /* bitsize */ 351 FALSE, /* pc_relative */ 352 0, /* bitpos */ 353 complain_overflow_bitfield,/* complain_on_overflow */ 354 bfd_elf_generic_reloc, /* special_function */ 355 "R_ARM_TLS_TPOFF32", /* name */ 356 TRUE, /* partial_inplace */ 357 0xffffffff, /* src_mask */ 358 0xffffffff, /* dst_mask */ 359 FALSE), /* pcrel_offset */ 360 361 /* Relocs used in ARM Linux */ 362 363 HOWTO (R_ARM_COPY, /* type */ 364 0, /* rightshift */ 365 2, /* size (0 = byte, 1 = short, 2 = long) */ 366 32, /* bitsize */ 367 FALSE, /* pc_relative */ 368 0, /* bitpos */ 369 complain_overflow_bitfield,/* complain_on_overflow */ 370 bfd_elf_generic_reloc, /* special_function */ 371 "R_ARM_COPY", /* name */ 372 TRUE, /* partial_inplace */ 373 0xffffffff, /* src_mask */ 374 0xffffffff, /* dst_mask */ 375 FALSE), /* pcrel_offset */ 376 377 HOWTO (R_ARM_GLOB_DAT, /* type */ 378 0, /* rightshift */ 379 2, /* size (0 = byte, 1 = short, 2 = long) */ 380 32, /* bitsize */ 381 FALSE, /* pc_relative */ 382 0, /* bitpos */ 383 complain_overflow_bitfield,/* complain_on_overflow */ 384 bfd_elf_generic_reloc, /* special_function */ 385 "R_ARM_GLOB_DAT", /* name */ 386 TRUE, /* partial_inplace */ 387 0xffffffff, /* src_mask */ 388 0xffffffff, /* dst_mask */ 389 FALSE), /* pcrel_offset */ 390 391 HOWTO (R_ARM_JUMP_SLOT, /* type */ 392 0, /* rightshift */ 393 2, /* size (0 = byte, 1 = short, 2 = long) */ 394 32, /* bitsize */ 395 FALSE, /* pc_relative */ 396 0, /* bitpos */ 397 complain_overflow_bitfield,/* complain_on_overflow */ 398 bfd_elf_generic_reloc, /* special_function */ 399 "R_ARM_JUMP_SLOT", /* name */ 400 TRUE, /* partial_inplace */ 401 0xffffffff, /* src_mask */ 402 0xffffffff, /* dst_mask */ 403 FALSE), /* pcrel_offset */ 404 405 HOWTO (R_ARM_RELATIVE, /* type */ 406 0, /* rightshift */ 407 2, /* size (0 = byte, 1 = short, 2 = long) */ 408 32, /* bitsize */ 409 FALSE, /* pc_relative */ 410 0, /* bitpos */ 411 complain_overflow_bitfield,/* complain_on_overflow */ 412 bfd_elf_generic_reloc, /* special_function */ 413 "R_ARM_RELATIVE", /* name */ 414 TRUE, /* partial_inplace */ 415 0xffffffff, /* src_mask */ 416 0xffffffff, /* dst_mask */ 417 FALSE), /* pcrel_offset */ 418 419 HOWTO (R_ARM_GOTOFF32, /* type */ 420 0, /* rightshift */ 421 2, /* size (0 = byte, 1 = short, 2 = long) */ 422 32, /* bitsize */ 423 FALSE, /* pc_relative */ 424 0, /* bitpos */ 425 complain_overflow_bitfield,/* complain_on_overflow */ 426 bfd_elf_generic_reloc, /* special_function */ 427 "R_ARM_GOTOFF32", /* name */ 428 TRUE, /* partial_inplace */ 429 0xffffffff, /* src_mask */ 430 0xffffffff, /* dst_mask */ 431 FALSE), /* pcrel_offset */ 432 433 HOWTO (R_ARM_GOTPC, /* type */ 434 0, /* rightshift */ 435 2, /* size (0 = byte, 1 = short, 2 = long) */ 436 32, /* bitsize */ 437 TRUE, /* pc_relative */ 438 0, /* bitpos */ 439 complain_overflow_bitfield,/* complain_on_overflow */ 440 bfd_elf_generic_reloc, /* special_function */ 441 "R_ARM_GOTPC", /* name */ 442 TRUE, /* partial_inplace */ 443 0xffffffff, /* src_mask */ 444 0xffffffff, /* dst_mask */ 445 TRUE), /* pcrel_offset */ 446 447 HOWTO (R_ARM_GOT32, /* type */ 448 0, /* rightshift */ 449 2, /* size (0 = byte, 1 = short, 2 = long) */ 450 32, /* bitsize */ 451 FALSE, /* pc_relative */ 452 0, /* bitpos */ 453 complain_overflow_bitfield,/* complain_on_overflow */ 454 bfd_elf_generic_reloc, /* special_function */ 455 "R_ARM_GOT32", /* name */ 456 TRUE, /* partial_inplace */ 457 0xffffffff, /* src_mask */ 458 0xffffffff, /* dst_mask */ 459 FALSE), /* pcrel_offset */ 460 461 HOWTO (R_ARM_PLT32, /* type */ 462 2, /* rightshift */ 463 2, /* size (0 = byte, 1 = short, 2 = long) */ 464 24, /* bitsize */ 465 TRUE, /* pc_relative */ 466 0, /* bitpos */ 467 complain_overflow_bitfield,/* complain_on_overflow */ 468 bfd_elf_generic_reloc, /* special_function */ 469 "R_ARM_PLT32", /* name */ 470 FALSE, /* partial_inplace */ 471 0x00ffffff, /* src_mask */ 472 0x00ffffff, /* dst_mask */ 473 TRUE), /* pcrel_offset */ 474 475 HOWTO (R_ARM_CALL, /* type */ 476 2, /* rightshift */ 477 2, /* size (0 = byte, 1 = short, 2 = long) */ 478 24, /* bitsize */ 479 TRUE, /* pc_relative */ 480 0, /* bitpos */ 481 complain_overflow_signed,/* complain_on_overflow */ 482 bfd_elf_generic_reloc, /* special_function */ 483 "R_ARM_CALL", /* name */ 484 FALSE, /* partial_inplace */ 485 0x00ffffff, /* src_mask */ 486 0x00ffffff, /* dst_mask */ 487 TRUE), /* pcrel_offset */ 488 489 HOWTO (R_ARM_JUMP24, /* type */ 490 2, /* rightshift */ 491 2, /* size (0 = byte, 1 = short, 2 = long) */ 492 24, /* bitsize */ 493 TRUE, /* pc_relative */ 494 0, /* bitpos */ 495 complain_overflow_signed,/* complain_on_overflow */ 496 bfd_elf_generic_reloc, /* special_function */ 497 "R_ARM_JUMP24", /* name */ 498 FALSE, /* partial_inplace */ 499 0x00ffffff, /* src_mask */ 500 0x00ffffff, /* dst_mask */ 501 TRUE), /* pcrel_offset */ 502 503 HOWTO (R_ARM_THM_JUMP24, /* type */ 504 1, /* rightshift */ 505 2, /* size (0 = byte, 1 = short, 2 = long) */ 506 24, /* bitsize */ 507 TRUE, /* pc_relative */ 508 0, /* bitpos */ 509 complain_overflow_signed,/* complain_on_overflow */ 510 bfd_elf_generic_reloc, /* special_function */ 511 "R_ARM_THM_JUMP24", /* name */ 512 FALSE, /* partial_inplace */ 513 0x07ff2fff, /* src_mask */ 514 0x07ff2fff, /* dst_mask */ 515 TRUE), /* pcrel_offset */ 516 517 HOWTO (R_ARM_BASE_ABS, /* type */ 518 0, /* rightshift */ 519 2, /* size (0 = byte, 1 = short, 2 = long) */ 520 32, /* bitsize */ 521 FALSE, /* pc_relative */ 522 0, /* bitpos */ 523 complain_overflow_dont,/* complain_on_overflow */ 524 bfd_elf_generic_reloc, /* special_function */ 525 "R_ARM_BASE_ABS", /* name */ 526 FALSE, /* partial_inplace */ 527 0xffffffff, /* src_mask */ 528 0xffffffff, /* dst_mask */ 529 FALSE), /* pcrel_offset */ 530 531 HOWTO (R_ARM_ALU_PCREL7_0, /* type */ 532 0, /* rightshift */ 533 2, /* size (0 = byte, 1 = short, 2 = long) */ 534 12, /* bitsize */ 535 TRUE, /* pc_relative */ 536 0, /* bitpos */ 537 complain_overflow_dont,/* complain_on_overflow */ 538 bfd_elf_generic_reloc, /* special_function */ 539 "R_ARM_ALU_PCREL_7_0", /* name */ 540 FALSE, /* partial_inplace */ 541 0x00000fff, /* src_mask */ 542 0x00000fff, /* dst_mask */ 543 TRUE), /* pcrel_offset */ 544 545 HOWTO (R_ARM_ALU_PCREL15_8, /* type */ 546 0, /* rightshift */ 547 2, /* size (0 = byte, 1 = short, 2 = long) */ 548 12, /* bitsize */ 549 TRUE, /* pc_relative */ 550 8, /* bitpos */ 551 complain_overflow_dont,/* complain_on_overflow */ 552 bfd_elf_generic_reloc, /* special_function */ 553 "R_ARM_ALU_PCREL_15_8",/* name */ 554 FALSE, /* partial_inplace */ 555 0x00000fff, /* src_mask */ 556 0x00000fff, /* dst_mask */ 557 TRUE), /* pcrel_offset */ 558 559 HOWTO (R_ARM_ALU_PCREL23_15, /* type */ 560 0, /* rightshift */ 561 2, /* size (0 = byte, 1 = short, 2 = long) */ 562 12, /* bitsize */ 563 TRUE, /* pc_relative */ 564 16, /* bitpos */ 565 complain_overflow_dont,/* complain_on_overflow */ 566 bfd_elf_generic_reloc, /* special_function */ 567 "R_ARM_ALU_PCREL_23_15",/* name */ 568 FALSE, /* partial_inplace */ 569 0x00000fff, /* src_mask */ 570 0x00000fff, /* dst_mask */ 571 TRUE), /* pcrel_offset */ 572 573 HOWTO (R_ARM_LDR_SBREL_11_0, /* type */ 574 0, /* rightshift */ 575 2, /* size (0 = byte, 1 = short, 2 = long) */ 576 12, /* bitsize */ 577 FALSE, /* pc_relative */ 578 0, /* bitpos */ 579 complain_overflow_dont,/* complain_on_overflow */ 580 bfd_elf_generic_reloc, /* special_function */ 581 "R_ARM_LDR_SBREL_11_0",/* name */ 582 FALSE, /* partial_inplace */ 583 0x00000fff, /* src_mask */ 584 0x00000fff, /* dst_mask */ 585 FALSE), /* pcrel_offset */ 586 587 HOWTO (R_ARM_ALU_SBREL_19_12, /* type */ 588 0, /* rightshift */ 589 2, /* size (0 = byte, 1 = short, 2 = long) */ 590 8, /* bitsize */ 591 FALSE, /* pc_relative */ 592 12, /* bitpos */ 593 complain_overflow_dont,/* complain_on_overflow */ 594 bfd_elf_generic_reloc, /* special_function */ 595 "R_ARM_ALU_SBREL_19_12",/* name */ 596 FALSE, /* partial_inplace */ 597 0x000ff000, /* src_mask */ 598 0x000ff000, /* dst_mask */ 599 FALSE), /* pcrel_offset */ 600 601 HOWTO (R_ARM_ALU_SBREL_27_20, /* type */ 602 0, /* rightshift */ 603 2, /* size (0 = byte, 1 = short, 2 = long) */ 604 8, /* bitsize */ 605 FALSE, /* pc_relative */ 606 20, /* bitpos */ 607 complain_overflow_dont,/* complain_on_overflow */ 608 bfd_elf_generic_reloc, /* special_function */ 609 "R_ARM_ALU_SBREL_27_20",/* name */ 610 FALSE, /* partial_inplace */ 611 0x0ff00000, /* src_mask */ 612 0x0ff00000, /* dst_mask */ 613 FALSE), /* pcrel_offset */ 614 615 HOWTO (R_ARM_TARGET1, /* type */ 616 0, /* rightshift */ 617 2, /* size (0 = byte, 1 = short, 2 = long) */ 618 32, /* bitsize */ 619 FALSE, /* pc_relative */ 620 0, /* bitpos */ 621 complain_overflow_dont,/* complain_on_overflow */ 622 bfd_elf_generic_reloc, /* special_function */ 623 "R_ARM_TARGET1", /* name */ 624 FALSE, /* partial_inplace */ 625 0xffffffff, /* src_mask */ 626 0xffffffff, /* dst_mask */ 627 FALSE), /* pcrel_offset */ 628 629 HOWTO (R_ARM_ROSEGREL32, /* type */ 630 0, /* rightshift */ 631 2, /* size (0 = byte, 1 = short, 2 = long) */ 632 32, /* bitsize */ 633 FALSE, /* pc_relative */ 634 0, /* bitpos */ 635 complain_overflow_dont,/* complain_on_overflow */ 636 bfd_elf_generic_reloc, /* special_function */ 637 "R_ARM_ROSEGREL32", /* name */ 638 FALSE, /* partial_inplace */ 639 0xffffffff, /* src_mask */ 640 0xffffffff, /* dst_mask */ 641 FALSE), /* pcrel_offset */ 642 643 HOWTO (R_ARM_V4BX, /* type */ 644 0, /* rightshift */ 645 2, /* size (0 = byte, 1 = short, 2 = long) */ 646 32, /* bitsize */ 647 FALSE, /* pc_relative */ 648 0, /* bitpos */ 649 complain_overflow_dont,/* complain_on_overflow */ 650 bfd_elf_generic_reloc, /* special_function */ 651 "R_ARM_V4BX", /* name */ 652 FALSE, /* partial_inplace */ 653 0xffffffff, /* src_mask */ 654 0xffffffff, /* dst_mask */ 655 FALSE), /* pcrel_offset */ 656 657 HOWTO (R_ARM_TARGET2, /* type */ 658 0, /* rightshift */ 659 2, /* size (0 = byte, 1 = short, 2 = long) */ 660 32, /* bitsize */ 661 FALSE, /* pc_relative */ 662 0, /* bitpos */ 663 complain_overflow_signed,/* complain_on_overflow */ 664 bfd_elf_generic_reloc, /* special_function */ 665 "R_ARM_TARGET2", /* name */ 666 FALSE, /* partial_inplace */ 667 0xffffffff, /* src_mask */ 668 0xffffffff, /* dst_mask */ 669 TRUE), /* pcrel_offset */ 670 671 HOWTO (R_ARM_PREL31, /* type */ 672 0, /* rightshift */ 673 2, /* size (0 = byte, 1 = short, 2 = long) */ 674 31, /* bitsize */ 675 TRUE, /* pc_relative */ 676 0, /* bitpos */ 677 complain_overflow_signed,/* complain_on_overflow */ 678 bfd_elf_generic_reloc, /* special_function */ 679 "R_ARM_PREL31", /* name */ 680 FALSE, /* partial_inplace */ 681 0x7fffffff, /* src_mask */ 682 0x7fffffff, /* dst_mask */ 683 TRUE), /* pcrel_offset */ 684 685 HOWTO (R_ARM_MOVW_ABS_NC, /* type */ 686 0, /* rightshift */ 687 2, /* size (0 = byte, 1 = short, 2 = long) */ 688 16, /* bitsize */ 689 FALSE, /* pc_relative */ 690 0, /* bitpos */ 691 complain_overflow_dont,/* complain_on_overflow */ 692 bfd_elf_generic_reloc, /* special_function */ 693 "R_ARM_MOVW_ABS_NC", /* name */ 694 FALSE, /* partial_inplace */ 695 0x000f0fff, /* src_mask */ 696 0x000f0fff, /* dst_mask */ 697 FALSE), /* pcrel_offset */ 698 699 HOWTO (R_ARM_MOVT_ABS, /* type */ 700 0, /* rightshift */ 701 2, /* size (0 = byte, 1 = short, 2 = long) */ 702 16, /* bitsize */ 703 FALSE, /* pc_relative */ 704 0, /* bitpos */ 705 complain_overflow_bitfield,/* complain_on_overflow */ 706 bfd_elf_generic_reloc, /* special_function */ 707 "R_ARM_MOVT_ABS", /* name */ 708 FALSE, /* partial_inplace */ 709 0x000f0fff, /* src_mask */ 710 0x000f0fff, /* dst_mask */ 711 FALSE), /* pcrel_offset */ 712 713 HOWTO (R_ARM_MOVW_PREL_NC, /* type */ 714 0, /* rightshift */ 715 2, /* size (0 = byte, 1 = short, 2 = long) */ 716 16, /* bitsize */ 717 TRUE, /* pc_relative */ 718 0, /* bitpos */ 719 complain_overflow_dont,/* complain_on_overflow */ 720 bfd_elf_generic_reloc, /* special_function */ 721 "R_ARM_MOVW_PREL_NC", /* name */ 722 FALSE, /* partial_inplace */ 723 0x000f0fff, /* src_mask */ 724 0x000f0fff, /* dst_mask */ 725 TRUE), /* pcrel_offset */ 726 727 HOWTO (R_ARM_MOVT_PREL, /* type */ 728 0, /* rightshift */ 729 2, /* size (0 = byte, 1 = short, 2 = long) */ 730 16, /* bitsize */ 731 TRUE, /* pc_relative */ 732 0, /* bitpos */ 733 complain_overflow_bitfield,/* complain_on_overflow */ 734 bfd_elf_generic_reloc, /* special_function */ 735 "R_ARM_MOVT_PREL", /* name */ 736 FALSE, /* partial_inplace */ 737 0x000f0fff, /* src_mask */ 738 0x000f0fff, /* dst_mask */ 739 TRUE), /* pcrel_offset */ 740 741 HOWTO (R_ARM_THM_MOVW_ABS_NC, /* type */ 742 0, /* rightshift */ 743 2, /* size (0 = byte, 1 = short, 2 = long) */ 744 16, /* bitsize */ 745 FALSE, /* pc_relative */ 746 0, /* bitpos */ 747 complain_overflow_dont,/* complain_on_overflow */ 748 bfd_elf_generic_reloc, /* special_function */ 749 "R_ARM_THM_MOVW_ABS_NC",/* name */ 750 FALSE, /* partial_inplace */ 751 0x040f70ff, /* src_mask */ 752 0x040f70ff, /* dst_mask */ 753 FALSE), /* pcrel_offset */ 754 755 HOWTO (R_ARM_THM_MOVT_ABS, /* type */ 756 0, /* rightshift */ 757 2, /* size (0 = byte, 1 = short, 2 = long) */ 758 16, /* bitsize */ 759 FALSE, /* pc_relative */ 760 0, /* bitpos */ 761 complain_overflow_bitfield,/* complain_on_overflow */ 762 bfd_elf_generic_reloc, /* special_function */ 763 "R_ARM_THM_MOVT_ABS", /* name */ 764 FALSE, /* partial_inplace */ 765 0x040f70ff, /* src_mask */ 766 0x040f70ff, /* dst_mask */ 767 FALSE), /* pcrel_offset */ 768 769 HOWTO (R_ARM_THM_MOVW_PREL_NC,/* type */ 770 0, /* rightshift */ 771 2, /* size (0 = byte, 1 = short, 2 = long) */ 772 16, /* bitsize */ 773 TRUE, /* pc_relative */ 774 0, /* bitpos */ 775 complain_overflow_dont,/* complain_on_overflow */ 776 bfd_elf_generic_reloc, /* special_function */ 777 "R_ARM_THM_MOVW_PREL_NC",/* name */ 778 FALSE, /* partial_inplace */ 779 0x040f70ff, /* src_mask */ 780 0x040f70ff, /* dst_mask */ 781 TRUE), /* pcrel_offset */ 782 783 HOWTO (R_ARM_THM_MOVT_PREL, /* type */ 784 0, /* rightshift */ 785 2, /* size (0 = byte, 1 = short, 2 = long) */ 786 16, /* bitsize */ 787 TRUE, /* pc_relative */ 788 0, /* bitpos */ 789 complain_overflow_bitfield,/* complain_on_overflow */ 790 bfd_elf_generic_reloc, /* special_function */ 791 "R_ARM_THM_MOVT_PREL", /* name */ 792 FALSE, /* partial_inplace */ 793 0x040f70ff, /* src_mask */ 794 0x040f70ff, /* dst_mask */ 795 TRUE), /* pcrel_offset */ 796 797 HOWTO (R_ARM_THM_JUMP19, /* type */ 798 1, /* rightshift */ 799 2, /* size (0 = byte, 1 = short, 2 = long) */ 800 19, /* bitsize */ 801 TRUE, /* pc_relative */ 802 0, /* bitpos */ 803 complain_overflow_signed,/* complain_on_overflow */ 804 bfd_elf_generic_reloc, /* special_function */ 805 "R_ARM_THM_JUMP19", /* name */ 806 FALSE, /* partial_inplace */ 807 0x043f2fff, /* src_mask */ 808 0x043f2fff, /* dst_mask */ 809 TRUE), /* pcrel_offset */ 810 811 HOWTO (R_ARM_THM_JUMP6, /* type */ 812 1, /* rightshift */ 813 1, /* size (0 = byte, 1 = short, 2 = long) */ 814 6, /* bitsize */ 815 TRUE, /* pc_relative */ 816 0, /* bitpos */ 817 complain_overflow_unsigned,/* complain_on_overflow */ 818 bfd_elf_generic_reloc, /* special_function */ 819 "R_ARM_THM_JUMP6", /* name */ 820 FALSE, /* partial_inplace */ 821 0x02f8, /* src_mask */ 822 0x02f8, /* dst_mask */ 823 TRUE), /* pcrel_offset */ 824 825 /* These are declared as 13-bit signed relocations because we can 826 address -4095 .. 4095(base) by altering ADDW to SUBW or vice 827 versa. */ 828 HOWTO (R_ARM_THM_ALU_PREL_11_0,/* type */ 829 0, /* rightshift */ 830 2, /* size (0 = byte, 1 = short, 2 = long) */ 831 13, /* bitsize */ 832 TRUE, /* pc_relative */ 833 0, /* bitpos */ 834 complain_overflow_dont,/* complain_on_overflow */ 835 bfd_elf_generic_reloc, /* special_function */ 836 "R_ARM_THM_ALU_PREL_11_0",/* name */ 837 FALSE, /* partial_inplace */ 838 0xffffffff, /* src_mask */ 839 0xffffffff, /* dst_mask */ 840 TRUE), /* pcrel_offset */ 841 842 HOWTO (R_ARM_THM_PC12, /* type */ 843 0, /* rightshift */ 844 2, /* size (0 = byte, 1 = short, 2 = long) */ 845 13, /* bitsize */ 846 TRUE, /* pc_relative */ 847 0, /* bitpos */ 848 complain_overflow_dont,/* complain_on_overflow */ 849 bfd_elf_generic_reloc, /* special_function */ 850 "R_ARM_THM_PC12", /* name */ 851 FALSE, /* partial_inplace */ 852 0xffffffff, /* src_mask */ 853 0xffffffff, /* dst_mask */ 854 TRUE), /* pcrel_offset */ 855 856 HOWTO (R_ARM_ABS32_NOI, /* type */ 857 0, /* rightshift */ 858 2, /* size (0 = byte, 1 = short, 2 = long) */ 859 32, /* bitsize */ 860 FALSE, /* pc_relative */ 861 0, /* bitpos */ 862 complain_overflow_dont,/* complain_on_overflow */ 863 bfd_elf_generic_reloc, /* special_function */ 864 "R_ARM_ABS32_NOI", /* name */ 865 FALSE, /* partial_inplace */ 866 0xffffffff, /* src_mask */ 867 0xffffffff, /* dst_mask */ 868 FALSE), /* pcrel_offset */ 869 870 HOWTO (R_ARM_REL32_NOI, /* type */ 871 0, /* rightshift */ 872 2, /* size (0 = byte, 1 = short, 2 = long) */ 873 32, /* bitsize */ 874 TRUE, /* pc_relative */ 875 0, /* bitpos */ 876 complain_overflow_dont,/* complain_on_overflow */ 877 bfd_elf_generic_reloc, /* special_function */ 878 "R_ARM_REL32_NOI", /* name */ 879 FALSE, /* partial_inplace */ 880 0xffffffff, /* src_mask */ 881 0xffffffff, /* dst_mask */ 882 FALSE), /* pcrel_offset */ 883 884 /* Group relocations. */ 885 886 HOWTO (R_ARM_ALU_PC_G0_NC, /* type */ 887 0, /* rightshift */ 888 2, /* size (0 = byte, 1 = short, 2 = long) */ 889 32, /* bitsize */ 890 TRUE, /* pc_relative */ 891 0, /* bitpos */ 892 complain_overflow_dont,/* complain_on_overflow */ 893 bfd_elf_generic_reloc, /* special_function */ 894 "R_ARM_ALU_PC_G0_NC", /* name */ 895 FALSE, /* partial_inplace */ 896 0xffffffff, /* src_mask */ 897 0xffffffff, /* dst_mask */ 898 TRUE), /* pcrel_offset */ 899 900 HOWTO (R_ARM_ALU_PC_G0, /* type */ 901 0, /* rightshift */ 902 2, /* size (0 = byte, 1 = short, 2 = long) */ 903 32, /* bitsize */ 904 TRUE, /* pc_relative */ 905 0, /* bitpos */ 906 complain_overflow_dont,/* complain_on_overflow */ 907 bfd_elf_generic_reloc, /* special_function */ 908 "R_ARM_ALU_PC_G0", /* name */ 909 FALSE, /* partial_inplace */ 910 0xffffffff, /* src_mask */ 911 0xffffffff, /* dst_mask */ 912 TRUE), /* pcrel_offset */ 913 914 HOWTO (R_ARM_ALU_PC_G1_NC, /* type */ 915 0, /* rightshift */ 916 2, /* size (0 = byte, 1 = short, 2 = long) */ 917 32, /* bitsize */ 918 TRUE, /* pc_relative */ 919 0, /* bitpos */ 920 complain_overflow_dont,/* complain_on_overflow */ 921 bfd_elf_generic_reloc, /* special_function */ 922 "R_ARM_ALU_PC_G1_NC", /* name */ 923 FALSE, /* partial_inplace */ 924 0xffffffff, /* src_mask */ 925 0xffffffff, /* dst_mask */ 926 TRUE), /* pcrel_offset */ 927 928 HOWTO (R_ARM_ALU_PC_G1, /* type */ 929 0, /* rightshift */ 930 2, /* size (0 = byte, 1 = short, 2 = long) */ 931 32, /* bitsize */ 932 TRUE, /* pc_relative */ 933 0, /* bitpos */ 934 complain_overflow_dont,/* complain_on_overflow */ 935 bfd_elf_generic_reloc, /* special_function */ 936 "R_ARM_ALU_PC_G1", /* name */ 937 FALSE, /* partial_inplace */ 938 0xffffffff, /* src_mask */ 939 0xffffffff, /* dst_mask */ 940 TRUE), /* pcrel_offset */ 941 942 HOWTO (R_ARM_ALU_PC_G2, /* type */ 943 0, /* rightshift */ 944 2, /* size (0 = byte, 1 = short, 2 = long) */ 945 32, /* bitsize */ 946 TRUE, /* pc_relative */ 947 0, /* bitpos */ 948 complain_overflow_dont,/* complain_on_overflow */ 949 bfd_elf_generic_reloc, /* special_function */ 950 "R_ARM_ALU_PC_G2", /* name */ 951 FALSE, /* partial_inplace */ 952 0xffffffff, /* src_mask */ 953 0xffffffff, /* dst_mask */ 954 TRUE), /* pcrel_offset */ 955 956 HOWTO (R_ARM_LDR_PC_G1, /* type */ 957 0, /* rightshift */ 958 2, /* size (0 = byte, 1 = short, 2 = long) */ 959 32, /* bitsize */ 960 TRUE, /* pc_relative */ 961 0, /* bitpos */ 962 complain_overflow_dont,/* complain_on_overflow */ 963 bfd_elf_generic_reloc, /* special_function */ 964 "R_ARM_LDR_PC_G1", /* name */ 965 FALSE, /* partial_inplace */ 966 0xffffffff, /* src_mask */ 967 0xffffffff, /* dst_mask */ 968 TRUE), /* pcrel_offset */ 969 970 HOWTO (R_ARM_LDR_PC_G2, /* type */ 971 0, /* rightshift */ 972 2, /* size (0 = byte, 1 = short, 2 = long) */ 973 32, /* bitsize */ 974 TRUE, /* pc_relative */ 975 0, /* bitpos */ 976 complain_overflow_dont,/* complain_on_overflow */ 977 bfd_elf_generic_reloc, /* special_function */ 978 "R_ARM_LDR_PC_G2", /* name */ 979 FALSE, /* partial_inplace */ 980 0xffffffff, /* src_mask */ 981 0xffffffff, /* dst_mask */ 982 TRUE), /* pcrel_offset */ 983 984 HOWTO (R_ARM_LDRS_PC_G0, /* type */ 985 0, /* rightshift */ 986 2, /* size (0 = byte, 1 = short, 2 = long) */ 987 32, /* bitsize */ 988 TRUE, /* pc_relative */ 989 0, /* bitpos */ 990 complain_overflow_dont,/* complain_on_overflow */ 991 bfd_elf_generic_reloc, /* special_function */ 992 "R_ARM_LDRS_PC_G0", /* name */ 993 FALSE, /* partial_inplace */ 994 0xffffffff, /* src_mask */ 995 0xffffffff, /* dst_mask */ 996 TRUE), /* pcrel_offset */ 997 998 HOWTO (R_ARM_LDRS_PC_G1, /* type */ 999 0, /* rightshift */ 1000 2, /* size (0 = byte, 1 = short, 2 = long) */ 1001 32, /* bitsize */ 1002 TRUE, /* pc_relative */ 1003 0, /* bitpos */ 1004 complain_overflow_dont,/* complain_on_overflow */ 1005 bfd_elf_generic_reloc, /* special_function */ 1006 "R_ARM_LDRS_PC_G1", /* name */ 1007 FALSE, /* partial_inplace */ 1008 0xffffffff, /* src_mask */ 1009 0xffffffff, /* dst_mask */ 1010 TRUE), /* pcrel_offset */ 1011 1012 HOWTO (R_ARM_LDRS_PC_G2, /* type */ 1013 0, /* rightshift */ 1014 2, /* size (0 = byte, 1 = short, 2 = long) */ 1015 32, /* bitsize */ 1016 TRUE, /* pc_relative */ 1017 0, /* bitpos */ 1018 complain_overflow_dont,/* complain_on_overflow */ 1019 bfd_elf_generic_reloc, /* special_function */ 1020 "R_ARM_LDRS_PC_G2", /* name */ 1021 FALSE, /* partial_inplace */ 1022 0xffffffff, /* src_mask */ 1023 0xffffffff, /* dst_mask */ 1024 TRUE), /* pcrel_offset */ 1025 1026 HOWTO (R_ARM_LDC_PC_G0, /* type */ 1027 0, /* rightshift */ 1028 2, /* size (0 = byte, 1 = short, 2 = long) */ 1029 32, /* bitsize */ 1030 TRUE, /* pc_relative */ 1031 0, /* bitpos */ 1032 complain_overflow_dont,/* complain_on_overflow */ 1033 bfd_elf_generic_reloc, /* special_function */ 1034 "R_ARM_LDC_PC_G0", /* name */ 1035 FALSE, /* partial_inplace */ 1036 0xffffffff, /* src_mask */ 1037 0xffffffff, /* dst_mask */ 1038 TRUE), /* pcrel_offset */ 1039 1040 HOWTO (R_ARM_LDC_PC_G1, /* type */ 1041 0, /* rightshift */ 1042 2, /* size (0 = byte, 1 = short, 2 = long) */ 1043 32, /* bitsize */ 1044 TRUE, /* pc_relative */ 1045 0, /* bitpos */ 1046 complain_overflow_dont,/* complain_on_overflow */ 1047 bfd_elf_generic_reloc, /* special_function */ 1048 "R_ARM_LDC_PC_G1", /* name */ 1049 FALSE, /* partial_inplace */ 1050 0xffffffff, /* src_mask */ 1051 0xffffffff, /* dst_mask */ 1052 TRUE), /* pcrel_offset */ 1053 1054 HOWTO (R_ARM_LDC_PC_G2, /* type */ 1055 0, /* rightshift */ 1056 2, /* size (0 = byte, 1 = short, 2 = long) */ 1057 32, /* bitsize */ 1058 TRUE, /* pc_relative */ 1059 0, /* bitpos */ 1060 complain_overflow_dont,/* complain_on_overflow */ 1061 bfd_elf_generic_reloc, /* special_function */ 1062 "R_ARM_LDC_PC_G2", /* name */ 1063 FALSE, /* partial_inplace */ 1064 0xffffffff, /* src_mask */ 1065 0xffffffff, /* dst_mask */ 1066 TRUE), /* pcrel_offset */ 1067 1068 HOWTO (R_ARM_ALU_SB_G0_NC, /* type */ 1069 0, /* rightshift */ 1070 2, /* size (0 = byte, 1 = short, 2 = long) */ 1071 32, /* bitsize */ 1072 TRUE, /* pc_relative */ 1073 0, /* bitpos */ 1074 complain_overflow_dont,/* complain_on_overflow */ 1075 bfd_elf_generic_reloc, /* special_function */ 1076 "R_ARM_ALU_SB_G0_NC", /* name */ 1077 FALSE, /* partial_inplace */ 1078 0xffffffff, /* src_mask */ 1079 0xffffffff, /* dst_mask */ 1080 TRUE), /* pcrel_offset */ 1081 1082 HOWTO (R_ARM_ALU_SB_G0, /* type */ 1083 0, /* rightshift */ 1084 2, /* size (0 = byte, 1 = short, 2 = long) */ 1085 32, /* bitsize */ 1086 TRUE, /* pc_relative */ 1087 0, /* bitpos */ 1088 complain_overflow_dont,/* complain_on_overflow */ 1089 bfd_elf_generic_reloc, /* special_function */ 1090 "R_ARM_ALU_SB_G0", /* name */ 1091 FALSE, /* partial_inplace */ 1092 0xffffffff, /* src_mask */ 1093 0xffffffff, /* dst_mask */ 1094 TRUE), /* pcrel_offset */ 1095 1096 HOWTO (R_ARM_ALU_SB_G1_NC, /* type */ 1097 0, /* rightshift */ 1098 2, /* size (0 = byte, 1 = short, 2 = long) */ 1099 32, /* bitsize */ 1100 TRUE, /* pc_relative */ 1101 0, /* bitpos */ 1102 complain_overflow_dont,/* complain_on_overflow */ 1103 bfd_elf_generic_reloc, /* special_function */ 1104 "R_ARM_ALU_SB_G1_NC", /* name */ 1105 FALSE, /* partial_inplace */ 1106 0xffffffff, /* src_mask */ 1107 0xffffffff, /* dst_mask */ 1108 TRUE), /* pcrel_offset */ 1109 1110 HOWTO (R_ARM_ALU_SB_G1, /* type */ 1111 0, /* rightshift */ 1112 2, /* size (0 = byte, 1 = short, 2 = long) */ 1113 32, /* bitsize */ 1114 TRUE, /* pc_relative */ 1115 0, /* bitpos */ 1116 complain_overflow_dont,/* complain_on_overflow */ 1117 bfd_elf_generic_reloc, /* special_function */ 1118 "R_ARM_ALU_SB_G1", /* name */ 1119 FALSE, /* partial_inplace */ 1120 0xffffffff, /* src_mask */ 1121 0xffffffff, /* dst_mask */ 1122 TRUE), /* pcrel_offset */ 1123 1124 HOWTO (R_ARM_ALU_SB_G2, /* type */ 1125 0, /* rightshift */ 1126 2, /* size (0 = byte, 1 = short, 2 = long) */ 1127 32, /* bitsize */ 1128 TRUE, /* pc_relative */ 1129 0, /* bitpos */ 1130 complain_overflow_dont,/* complain_on_overflow */ 1131 bfd_elf_generic_reloc, /* special_function */ 1132 "R_ARM_ALU_SB_G2", /* name */ 1133 FALSE, /* partial_inplace */ 1134 0xffffffff, /* src_mask */ 1135 0xffffffff, /* dst_mask */ 1136 TRUE), /* pcrel_offset */ 1137 1138 HOWTO (R_ARM_LDR_SB_G0, /* type */ 1139 0, /* rightshift */ 1140 2, /* size (0 = byte, 1 = short, 2 = long) */ 1141 32, /* bitsize */ 1142 TRUE, /* pc_relative */ 1143 0, /* bitpos */ 1144 complain_overflow_dont,/* complain_on_overflow */ 1145 bfd_elf_generic_reloc, /* special_function */ 1146 "R_ARM_LDR_SB_G0", /* name */ 1147 FALSE, /* partial_inplace */ 1148 0xffffffff, /* src_mask */ 1149 0xffffffff, /* dst_mask */ 1150 TRUE), /* pcrel_offset */ 1151 1152 HOWTO (R_ARM_LDR_SB_G1, /* type */ 1153 0, /* rightshift */ 1154 2, /* size (0 = byte, 1 = short, 2 = long) */ 1155 32, /* bitsize */ 1156 TRUE, /* pc_relative */ 1157 0, /* bitpos */ 1158 complain_overflow_dont,/* complain_on_overflow */ 1159 bfd_elf_generic_reloc, /* special_function */ 1160 "R_ARM_LDR_SB_G1", /* name */ 1161 FALSE, /* partial_inplace */ 1162 0xffffffff, /* src_mask */ 1163 0xffffffff, /* dst_mask */ 1164 TRUE), /* pcrel_offset */ 1165 1166 HOWTO (R_ARM_LDR_SB_G2, /* type */ 1167 0, /* rightshift */ 1168 2, /* size (0 = byte, 1 = short, 2 = long) */ 1169 32, /* bitsize */ 1170 TRUE, /* pc_relative */ 1171 0, /* bitpos */ 1172 complain_overflow_dont,/* complain_on_overflow */ 1173 bfd_elf_generic_reloc, /* special_function */ 1174 "R_ARM_LDR_SB_G2", /* name */ 1175 FALSE, /* partial_inplace */ 1176 0xffffffff, /* src_mask */ 1177 0xffffffff, /* dst_mask */ 1178 TRUE), /* pcrel_offset */ 1179 1180 HOWTO (R_ARM_LDRS_SB_G0, /* type */ 1181 0, /* rightshift */ 1182 2, /* size (0 = byte, 1 = short, 2 = long) */ 1183 32, /* bitsize */ 1184 TRUE, /* pc_relative */ 1185 0, /* bitpos */ 1186 complain_overflow_dont,/* complain_on_overflow */ 1187 bfd_elf_generic_reloc, /* special_function */ 1188 "R_ARM_LDRS_SB_G0", /* name */ 1189 FALSE, /* partial_inplace */ 1190 0xffffffff, /* src_mask */ 1191 0xffffffff, /* dst_mask */ 1192 TRUE), /* pcrel_offset */ 1193 1194 HOWTO (R_ARM_LDRS_SB_G1, /* type */ 1195 0, /* rightshift */ 1196 2, /* size (0 = byte, 1 = short, 2 = long) */ 1197 32, /* bitsize */ 1198 TRUE, /* pc_relative */ 1199 0, /* bitpos */ 1200 complain_overflow_dont,/* complain_on_overflow */ 1201 bfd_elf_generic_reloc, /* special_function */ 1202 "R_ARM_LDRS_SB_G1", /* name */ 1203 FALSE, /* partial_inplace */ 1204 0xffffffff, /* src_mask */ 1205 0xffffffff, /* dst_mask */ 1206 TRUE), /* pcrel_offset */ 1207 1208 HOWTO (R_ARM_LDRS_SB_G2, /* type */ 1209 0, /* rightshift */ 1210 2, /* size (0 = byte, 1 = short, 2 = long) */ 1211 32, /* bitsize */ 1212 TRUE, /* pc_relative */ 1213 0, /* bitpos */ 1214 complain_overflow_dont,/* complain_on_overflow */ 1215 bfd_elf_generic_reloc, /* special_function */ 1216 "R_ARM_LDRS_SB_G2", /* name */ 1217 FALSE, /* partial_inplace */ 1218 0xffffffff, /* src_mask */ 1219 0xffffffff, /* dst_mask */ 1220 TRUE), /* pcrel_offset */ 1221 1222 HOWTO (R_ARM_LDC_SB_G0, /* type */ 1223 0, /* rightshift */ 1224 2, /* size (0 = byte, 1 = short, 2 = long) */ 1225 32, /* bitsize */ 1226 TRUE, /* pc_relative */ 1227 0, /* bitpos */ 1228 complain_overflow_dont,/* complain_on_overflow */ 1229 bfd_elf_generic_reloc, /* special_function */ 1230 "R_ARM_LDC_SB_G0", /* name */ 1231 FALSE, /* partial_inplace */ 1232 0xffffffff, /* src_mask */ 1233 0xffffffff, /* dst_mask */ 1234 TRUE), /* pcrel_offset */ 1235 1236 HOWTO (R_ARM_LDC_SB_G1, /* type */ 1237 0, /* rightshift */ 1238 2, /* size (0 = byte, 1 = short, 2 = long) */ 1239 32, /* bitsize */ 1240 TRUE, /* pc_relative */ 1241 0, /* bitpos */ 1242 complain_overflow_dont,/* complain_on_overflow */ 1243 bfd_elf_generic_reloc, /* special_function */ 1244 "R_ARM_LDC_SB_G1", /* name */ 1245 FALSE, /* partial_inplace */ 1246 0xffffffff, /* src_mask */ 1247 0xffffffff, /* dst_mask */ 1248 TRUE), /* pcrel_offset */ 1249 1250 HOWTO (R_ARM_LDC_SB_G2, /* type */ 1251 0, /* rightshift */ 1252 2, /* size (0 = byte, 1 = short, 2 = long) */ 1253 32, /* bitsize */ 1254 TRUE, /* pc_relative */ 1255 0, /* bitpos */ 1256 complain_overflow_dont,/* complain_on_overflow */ 1257 bfd_elf_generic_reloc, /* special_function */ 1258 "R_ARM_LDC_SB_G2", /* name */ 1259 FALSE, /* partial_inplace */ 1260 0xffffffff, /* src_mask */ 1261 0xffffffff, /* dst_mask */ 1262 TRUE), /* pcrel_offset */ 1263 1264 /* End of group relocations. */ 1265 1266 HOWTO (R_ARM_MOVW_BREL_NC, /* type */ 1267 0, /* rightshift */ 1268 2, /* size (0 = byte, 1 = short, 2 = long) */ 1269 16, /* bitsize */ 1270 FALSE, /* pc_relative */ 1271 0, /* bitpos */ 1272 complain_overflow_dont,/* complain_on_overflow */ 1273 bfd_elf_generic_reloc, /* special_function */ 1274 "R_ARM_MOVW_BREL_NC", /* name */ 1275 FALSE, /* partial_inplace */ 1276 0x0000ffff, /* src_mask */ 1277 0x0000ffff, /* dst_mask */ 1278 FALSE), /* pcrel_offset */ 1279 1280 HOWTO (R_ARM_MOVT_BREL, /* type */ 1281 0, /* rightshift */ 1282 2, /* size (0 = byte, 1 = short, 2 = long) */ 1283 16, /* bitsize */ 1284 FALSE, /* pc_relative */ 1285 0, /* bitpos */ 1286 complain_overflow_bitfield,/* complain_on_overflow */ 1287 bfd_elf_generic_reloc, /* special_function */ 1288 "R_ARM_MOVT_BREL", /* name */ 1289 FALSE, /* partial_inplace */ 1290 0x0000ffff, /* src_mask */ 1291 0x0000ffff, /* dst_mask */ 1292 FALSE), /* pcrel_offset */ 1293 1294 HOWTO (R_ARM_MOVW_BREL, /* type */ 1295 0, /* rightshift */ 1296 2, /* size (0 = byte, 1 = short, 2 = long) */ 1297 16, /* bitsize */ 1298 FALSE, /* pc_relative */ 1299 0, /* bitpos */ 1300 complain_overflow_dont,/* complain_on_overflow */ 1301 bfd_elf_generic_reloc, /* special_function */ 1302 "R_ARM_MOVW_BREL", /* name */ 1303 FALSE, /* partial_inplace */ 1304 0x0000ffff, /* src_mask */ 1305 0x0000ffff, /* dst_mask */ 1306 FALSE), /* pcrel_offset */ 1307 1308 HOWTO (R_ARM_THM_MOVW_BREL_NC,/* type */ 1309 0, /* rightshift */ 1310 2, /* size (0 = byte, 1 = short, 2 = long) */ 1311 16, /* bitsize */ 1312 FALSE, /* pc_relative */ 1313 0, /* bitpos */ 1314 complain_overflow_dont,/* complain_on_overflow */ 1315 bfd_elf_generic_reloc, /* special_function */ 1316 "R_ARM_THM_MOVW_BREL_NC",/* name */ 1317 FALSE, /* partial_inplace */ 1318 0x040f70ff, /* src_mask */ 1319 0x040f70ff, /* dst_mask */ 1320 FALSE), /* pcrel_offset */ 1321 1322 HOWTO (R_ARM_THM_MOVT_BREL, /* type */ 1323 0, /* rightshift */ 1324 2, /* size (0 = byte, 1 = short, 2 = long) */ 1325 16, /* bitsize */ 1326 FALSE, /* pc_relative */ 1327 0, /* bitpos */ 1328 complain_overflow_bitfield,/* complain_on_overflow */ 1329 bfd_elf_generic_reloc, /* special_function */ 1330 "R_ARM_THM_MOVT_BREL", /* name */ 1331 FALSE, /* partial_inplace */ 1332 0x040f70ff, /* src_mask */ 1333 0x040f70ff, /* dst_mask */ 1334 FALSE), /* pcrel_offset */ 1335 1336 HOWTO (R_ARM_THM_MOVW_BREL, /* type */ 1337 0, /* rightshift */ 1338 2, /* size (0 = byte, 1 = short, 2 = long) */ 1339 16, /* bitsize */ 1340 FALSE, /* pc_relative */ 1341 0, /* bitpos */ 1342 complain_overflow_dont,/* complain_on_overflow */ 1343 bfd_elf_generic_reloc, /* special_function */ 1344 "R_ARM_THM_MOVW_BREL", /* name */ 1345 FALSE, /* partial_inplace */ 1346 0x040f70ff, /* src_mask */ 1347 0x040f70ff, /* dst_mask */ 1348 FALSE), /* pcrel_offset */ 1349 1350 EMPTY_HOWTO (90), /* Unallocated. */ 1351 EMPTY_HOWTO (91), 1352 EMPTY_HOWTO (92), 1353 EMPTY_HOWTO (93), 1354 1355 HOWTO (R_ARM_PLT32_ABS, /* type */ 1356 0, /* rightshift */ 1357 2, /* size (0 = byte, 1 = short, 2 = long) */ 1358 32, /* bitsize */ 1359 FALSE, /* pc_relative */ 1360 0, /* bitpos */ 1361 complain_overflow_dont,/* complain_on_overflow */ 1362 bfd_elf_generic_reloc, /* special_function */ 1363 "R_ARM_PLT32_ABS", /* name */ 1364 FALSE, /* partial_inplace */ 1365 0xffffffff, /* src_mask */ 1366 0xffffffff, /* dst_mask */ 1367 FALSE), /* pcrel_offset */ 1368 1369 HOWTO (R_ARM_GOT_ABS, /* type */ 1370 0, /* rightshift */ 1371 2, /* size (0 = byte, 1 = short, 2 = long) */ 1372 32, /* bitsize */ 1373 FALSE, /* pc_relative */ 1374 0, /* bitpos */ 1375 complain_overflow_dont,/* complain_on_overflow */ 1376 bfd_elf_generic_reloc, /* special_function */ 1377 "R_ARM_GOT_ABS", /* name */ 1378 FALSE, /* partial_inplace */ 1379 0xffffffff, /* src_mask */ 1380 0xffffffff, /* dst_mask */ 1381 FALSE), /* pcrel_offset */ 1382 1383 HOWTO (R_ARM_GOT_PREL, /* type */ 1384 0, /* rightshift */ 1385 2, /* size (0 = byte, 1 = short, 2 = long) */ 1386 32, /* bitsize */ 1387 TRUE, /* pc_relative */ 1388 0, /* bitpos */ 1389 complain_overflow_dont, /* complain_on_overflow */ 1390 bfd_elf_generic_reloc, /* special_function */ 1391 "R_ARM_GOT_PREL", /* name */ 1392 FALSE, /* partial_inplace */ 1393 0xffffffff, /* src_mask */ 1394 0xffffffff, /* dst_mask */ 1395 TRUE), /* pcrel_offset */ 1396 1397 HOWTO (R_ARM_GOT_BREL12, /* type */ 1398 0, /* rightshift */ 1399 2, /* size (0 = byte, 1 = short, 2 = long) */ 1400 12, /* bitsize */ 1401 FALSE, /* pc_relative */ 1402 0, /* bitpos */ 1403 complain_overflow_bitfield,/* complain_on_overflow */ 1404 bfd_elf_generic_reloc, /* special_function */ 1405 "R_ARM_GOT_BREL12", /* name */ 1406 FALSE, /* partial_inplace */ 1407 0x00000fff, /* src_mask */ 1408 0x00000fff, /* dst_mask */ 1409 FALSE), /* pcrel_offset */ 1410 1411 HOWTO (R_ARM_GOTOFF12, /* type */ 1412 0, /* rightshift */ 1413 2, /* size (0 = byte, 1 = short, 2 = long) */ 1414 12, /* bitsize */ 1415 FALSE, /* pc_relative */ 1416 0, /* bitpos */ 1417 complain_overflow_bitfield,/* complain_on_overflow */ 1418 bfd_elf_generic_reloc, /* special_function */ 1419 "R_ARM_GOTOFF12", /* name */ 1420 FALSE, /* partial_inplace */ 1421 0x00000fff, /* src_mask */ 1422 0x00000fff, /* dst_mask */ 1423 FALSE), /* pcrel_offset */ 1424 1425 EMPTY_HOWTO (R_ARM_GOTRELAX), /* reserved for future GOT-load optimizations */ 1426 1427 /* GNU extension to record C++ vtable member usage */ 1428 HOWTO (R_ARM_GNU_VTENTRY, /* type */ 1429 0, /* rightshift */ 1430 2, /* size (0 = byte, 1 = short, 2 = long) */ 1431 0, /* bitsize */ 1432 FALSE, /* pc_relative */ 1433 0, /* bitpos */ 1434 complain_overflow_dont, /* complain_on_overflow */ 1435 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 1436 "R_ARM_GNU_VTENTRY", /* name */ 1437 FALSE, /* partial_inplace */ 1438 0, /* src_mask */ 1439 0, /* dst_mask */ 1440 FALSE), /* pcrel_offset */ 1441 1442 /* GNU extension to record C++ vtable hierarchy */ 1443 HOWTO (R_ARM_GNU_VTINHERIT, /* type */ 1444 0, /* rightshift */ 1445 2, /* size (0 = byte, 1 = short, 2 = long) */ 1446 0, /* bitsize */ 1447 FALSE, /* pc_relative */ 1448 0, /* bitpos */ 1449 complain_overflow_dont, /* complain_on_overflow */ 1450 NULL, /* special_function */ 1451 "R_ARM_GNU_VTINHERIT", /* name */ 1452 FALSE, /* partial_inplace */ 1453 0, /* src_mask */ 1454 0, /* dst_mask */ 1455 FALSE), /* pcrel_offset */ 1456 1457 HOWTO (R_ARM_THM_JUMP11, /* type */ 1458 1, /* rightshift */ 1459 1, /* size (0 = byte, 1 = short, 2 = long) */ 1460 11, /* bitsize */ 1461 TRUE, /* pc_relative */ 1462 0, /* bitpos */ 1463 complain_overflow_signed, /* complain_on_overflow */ 1464 bfd_elf_generic_reloc, /* special_function */ 1465 "R_ARM_THM_JUMP11", /* name */ 1466 FALSE, /* partial_inplace */ 1467 0x000007ff, /* src_mask */ 1468 0x000007ff, /* dst_mask */ 1469 TRUE), /* pcrel_offset */ 1470 1471 HOWTO (R_ARM_THM_JUMP8, /* type */ 1472 1, /* rightshift */ 1473 1, /* size (0 = byte, 1 = short, 2 = long) */ 1474 8, /* bitsize */ 1475 TRUE, /* pc_relative */ 1476 0, /* bitpos */ 1477 complain_overflow_signed, /* complain_on_overflow */ 1478 bfd_elf_generic_reloc, /* special_function */ 1479 "R_ARM_THM_JUMP8", /* name */ 1480 FALSE, /* partial_inplace */ 1481 0x000000ff, /* src_mask */ 1482 0x000000ff, /* dst_mask */ 1483 TRUE), /* pcrel_offset */ 1484 1485 /* TLS relocations */ 1486 HOWTO (R_ARM_TLS_GD32, /* type */ 1487 0, /* rightshift */ 1488 2, /* size (0 = byte, 1 = short, 2 = long) */ 1489 32, /* bitsize */ 1490 FALSE, /* pc_relative */ 1491 0, /* bitpos */ 1492 complain_overflow_bitfield,/* complain_on_overflow */ 1493 NULL, /* special_function */ 1494 "R_ARM_TLS_GD32", /* name */ 1495 TRUE, /* partial_inplace */ 1496 0xffffffff, /* src_mask */ 1497 0xffffffff, /* dst_mask */ 1498 FALSE), /* pcrel_offset */ 1499 1500 HOWTO (R_ARM_TLS_LDM32, /* type */ 1501 0, /* rightshift */ 1502 2, /* size (0 = byte, 1 = short, 2 = long) */ 1503 32, /* bitsize */ 1504 FALSE, /* pc_relative */ 1505 0, /* bitpos */ 1506 complain_overflow_bitfield,/* complain_on_overflow */ 1507 bfd_elf_generic_reloc, /* special_function */ 1508 "R_ARM_TLS_LDM32", /* name */ 1509 TRUE, /* partial_inplace */ 1510 0xffffffff, /* src_mask */ 1511 0xffffffff, /* dst_mask */ 1512 FALSE), /* pcrel_offset */ 1513 1514 HOWTO (R_ARM_TLS_LDO32, /* type */ 1515 0, /* rightshift */ 1516 2, /* size (0 = byte, 1 = short, 2 = long) */ 1517 32, /* bitsize */ 1518 FALSE, /* pc_relative */ 1519 0, /* bitpos */ 1520 complain_overflow_bitfield,/* complain_on_overflow */ 1521 bfd_elf_generic_reloc, /* special_function */ 1522 "R_ARM_TLS_LDO32", /* name */ 1523 TRUE, /* partial_inplace */ 1524 0xffffffff, /* src_mask */ 1525 0xffffffff, /* dst_mask */ 1526 FALSE), /* pcrel_offset */ 1527 1528 HOWTO (R_ARM_TLS_IE32, /* type */ 1529 0, /* rightshift */ 1530 2, /* size (0 = byte, 1 = short, 2 = long) */ 1531 32, /* bitsize */ 1532 FALSE, /* pc_relative */ 1533 0, /* bitpos */ 1534 complain_overflow_bitfield,/* complain_on_overflow */ 1535 NULL, /* special_function */ 1536 "R_ARM_TLS_IE32", /* name */ 1537 TRUE, /* partial_inplace */ 1538 0xffffffff, /* src_mask */ 1539 0xffffffff, /* dst_mask */ 1540 FALSE), /* pcrel_offset */ 1541 1542 HOWTO (R_ARM_TLS_LE32, /* type */ 1543 0, /* rightshift */ 1544 2, /* size (0 = byte, 1 = short, 2 = long) */ 1545 32, /* bitsize */ 1546 FALSE, /* pc_relative */ 1547 0, /* bitpos */ 1548 complain_overflow_bitfield,/* complain_on_overflow */ 1549 bfd_elf_generic_reloc, /* special_function */ 1550 "R_ARM_TLS_LE32", /* name */ 1551 TRUE, /* partial_inplace */ 1552 0xffffffff, /* src_mask */ 1553 0xffffffff, /* dst_mask */ 1554 FALSE), /* pcrel_offset */ 1555 1556 HOWTO (R_ARM_TLS_LDO12, /* type */ 1557 0, /* rightshift */ 1558 2, /* size (0 = byte, 1 = short, 2 = long) */ 1559 12, /* bitsize */ 1560 FALSE, /* pc_relative */ 1561 0, /* bitpos */ 1562 complain_overflow_bitfield,/* complain_on_overflow */ 1563 bfd_elf_generic_reloc, /* special_function */ 1564 "R_ARM_TLS_LDO12", /* name */ 1565 FALSE, /* partial_inplace */ 1566 0x00000fff, /* src_mask */ 1567 0x00000fff, /* dst_mask */ 1568 FALSE), /* pcrel_offset */ 1569 1570 HOWTO (R_ARM_TLS_LE12, /* type */ 1571 0, /* rightshift */ 1572 2, /* size (0 = byte, 1 = short, 2 = long) */ 1573 12, /* bitsize */ 1574 FALSE, /* pc_relative */ 1575 0, /* bitpos */ 1576 complain_overflow_bitfield,/* complain_on_overflow */ 1577 bfd_elf_generic_reloc, /* special_function */ 1578 "R_ARM_TLS_LE12", /* name */ 1579 FALSE, /* partial_inplace */ 1580 0x00000fff, /* src_mask */ 1581 0x00000fff, /* dst_mask */ 1582 FALSE), /* pcrel_offset */ 1583 1584 HOWTO (R_ARM_TLS_IE12GP, /* type */ 1585 0, /* rightshift */ 1586 2, /* size (0 = byte, 1 = short, 2 = long) */ 1587 12, /* bitsize */ 1588 FALSE, /* pc_relative */ 1589 0, /* bitpos */ 1590 complain_overflow_bitfield,/* complain_on_overflow */ 1591 bfd_elf_generic_reloc, /* special_function */ 1592 "R_ARM_TLS_IE12GP", /* name */ 1593 FALSE, /* partial_inplace */ 1594 0x00000fff, /* src_mask */ 1595 0x00000fff, /* dst_mask */ 1596 FALSE), /* pcrel_offset */ 1597 }; 1598 1599 /* 112-127 private relocations 1600 128 R_ARM_ME_TOO, obsolete 1601 129-255 unallocated in AAELF. 1602 1603 249-255 extended, currently unused, relocations: */ 1604 1605 static reloc_howto_type elf32_arm_howto_table_2[4] = 1606 { 1607 HOWTO (R_ARM_RREL32, /* type */ 1608 0, /* rightshift */ 1609 0, /* size (0 = byte, 1 = short, 2 = long) */ 1610 0, /* bitsize */ 1611 FALSE, /* pc_relative */ 1612 0, /* bitpos */ 1613 complain_overflow_dont,/* complain_on_overflow */ 1614 bfd_elf_generic_reloc, /* special_function */ 1615 "R_ARM_RREL32", /* name */ 1616 FALSE, /* partial_inplace */ 1617 0, /* src_mask */ 1618 0, /* dst_mask */ 1619 FALSE), /* pcrel_offset */ 1620 1621 HOWTO (R_ARM_RABS32, /* type */ 1622 0, /* rightshift */ 1623 0, /* size (0 = byte, 1 = short, 2 = long) */ 1624 0, /* bitsize */ 1625 FALSE, /* pc_relative */ 1626 0, /* bitpos */ 1627 complain_overflow_dont,/* complain_on_overflow */ 1628 bfd_elf_generic_reloc, /* special_function */ 1629 "R_ARM_RABS32", /* name */ 1630 FALSE, /* partial_inplace */ 1631 0, /* src_mask */ 1632 0, /* dst_mask */ 1633 FALSE), /* pcrel_offset */ 1634 1635 HOWTO (R_ARM_RPC24, /* type */ 1636 0, /* rightshift */ 1637 0, /* size (0 = byte, 1 = short, 2 = long) */ 1638 0, /* bitsize */ 1639 FALSE, /* pc_relative */ 1640 0, /* bitpos */ 1641 complain_overflow_dont,/* complain_on_overflow */ 1642 bfd_elf_generic_reloc, /* special_function */ 1643 "R_ARM_RPC24", /* name */ 1644 FALSE, /* partial_inplace */ 1645 0, /* src_mask */ 1646 0, /* dst_mask */ 1647 FALSE), /* pcrel_offset */ 1648 1649 HOWTO (R_ARM_RBASE, /* type */ 1650 0, /* rightshift */ 1651 0, /* size (0 = byte, 1 = short, 2 = long) */ 1652 0, /* bitsize */ 1653 FALSE, /* pc_relative */ 1654 0, /* bitpos */ 1655 complain_overflow_dont,/* complain_on_overflow */ 1656 bfd_elf_generic_reloc, /* special_function */ 1657 "R_ARM_RBASE", /* name */ 1658 FALSE, /* partial_inplace */ 1659 0, /* src_mask */ 1660 0, /* dst_mask */ 1661 FALSE) /* pcrel_offset */ 1662 }; 1663 1664 static reloc_howto_type * 1665 elf32_arm_howto_from_type (unsigned int r_type) 1666 { 1667 if (r_type < ARRAY_SIZE (elf32_arm_howto_table_1)) 1668 return &elf32_arm_howto_table_1[r_type]; 1669 1670 if (r_type >= R_ARM_RREL32 1671 && r_type < R_ARM_RREL32 + ARRAY_SIZE (elf32_arm_howto_table_2)) 1672 return &elf32_arm_howto_table_2[r_type - R_ARM_RREL32]; 1673 1674 return NULL; 1675 } 1676 1677 static void 1678 elf32_arm_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED, arelent * bfd_reloc, 1679 Elf_Internal_Rela * elf_reloc) 1680 { 1681 unsigned int r_type; 1682 1683 r_type = ELF32_R_TYPE (elf_reloc->r_info); 1684 bfd_reloc->howto = elf32_arm_howto_from_type (r_type); 1685 } 1686 1687 struct elf32_arm_reloc_map 1688 { 1689 bfd_reloc_code_real_type bfd_reloc_val; 1690 unsigned char elf_reloc_val; 1691 }; 1692 1693 /* All entries in this list must also be present in elf32_arm_howto_table. */ 1694 static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] = 1695 { 1696 {BFD_RELOC_NONE, R_ARM_NONE}, 1697 {BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24}, 1698 {BFD_RELOC_ARM_PCREL_CALL, R_ARM_CALL}, 1699 {BFD_RELOC_ARM_PCREL_JUMP, R_ARM_JUMP24}, 1700 {BFD_RELOC_ARM_PCREL_BLX, R_ARM_XPC25}, 1701 {BFD_RELOC_THUMB_PCREL_BLX, R_ARM_THM_XPC22}, 1702 {BFD_RELOC_32, R_ARM_ABS32}, 1703 {BFD_RELOC_32_PCREL, R_ARM_REL32}, 1704 {BFD_RELOC_8, R_ARM_ABS8}, 1705 {BFD_RELOC_16, R_ARM_ABS16}, 1706 {BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12}, 1707 {BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5}, 1708 {BFD_RELOC_THUMB_PCREL_BRANCH25, R_ARM_THM_JUMP24}, 1709 {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_CALL}, 1710 {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_JUMP11}, 1711 {BFD_RELOC_THUMB_PCREL_BRANCH20, R_ARM_THM_JUMP19}, 1712 {BFD_RELOC_THUMB_PCREL_BRANCH9, R_ARM_THM_JUMP8}, 1713 {BFD_RELOC_THUMB_PCREL_BRANCH7, R_ARM_THM_JUMP6}, 1714 {BFD_RELOC_ARM_GLOB_DAT, R_ARM_GLOB_DAT}, 1715 {BFD_RELOC_ARM_JUMP_SLOT, R_ARM_JUMP_SLOT}, 1716 {BFD_RELOC_ARM_RELATIVE, R_ARM_RELATIVE}, 1717 {BFD_RELOC_ARM_GOTOFF, R_ARM_GOTOFF32}, 1718 {BFD_RELOC_ARM_GOTPC, R_ARM_GOTPC}, 1719 {BFD_RELOC_ARM_GOT32, R_ARM_GOT32}, 1720 {BFD_RELOC_ARM_PLT32, R_ARM_PLT32}, 1721 {BFD_RELOC_ARM_TARGET1, R_ARM_TARGET1}, 1722 {BFD_RELOC_ARM_ROSEGREL32, R_ARM_ROSEGREL32}, 1723 {BFD_RELOC_ARM_SBREL32, R_ARM_SBREL32}, 1724 {BFD_RELOC_ARM_PREL31, R_ARM_PREL31}, 1725 {BFD_RELOC_ARM_TARGET2, R_ARM_TARGET2}, 1726 {BFD_RELOC_ARM_PLT32, R_ARM_PLT32}, 1727 {BFD_RELOC_ARM_TLS_GD32, R_ARM_TLS_GD32}, 1728 {BFD_RELOC_ARM_TLS_LDO32, R_ARM_TLS_LDO32}, 1729 {BFD_RELOC_ARM_TLS_LDM32, R_ARM_TLS_LDM32}, 1730 {BFD_RELOC_ARM_TLS_DTPMOD32, R_ARM_TLS_DTPMOD32}, 1731 {BFD_RELOC_ARM_TLS_DTPOFF32, R_ARM_TLS_DTPOFF32}, 1732 {BFD_RELOC_ARM_TLS_TPOFF32, R_ARM_TLS_TPOFF32}, 1733 {BFD_RELOC_ARM_TLS_IE32, R_ARM_TLS_IE32}, 1734 {BFD_RELOC_ARM_TLS_LE32, R_ARM_TLS_LE32}, 1735 {BFD_RELOC_VTABLE_INHERIT, R_ARM_GNU_VTINHERIT}, 1736 {BFD_RELOC_VTABLE_ENTRY, R_ARM_GNU_VTENTRY}, 1737 {BFD_RELOC_ARM_MOVW, R_ARM_MOVW_ABS_NC}, 1738 {BFD_RELOC_ARM_MOVT, R_ARM_MOVT_ABS}, 1739 {BFD_RELOC_ARM_MOVW_PCREL, R_ARM_MOVW_PREL_NC}, 1740 {BFD_RELOC_ARM_MOVT_PCREL, R_ARM_MOVT_PREL}, 1741 {BFD_RELOC_ARM_THUMB_MOVW, R_ARM_THM_MOVW_ABS_NC}, 1742 {BFD_RELOC_ARM_THUMB_MOVT, R_ARM_THM_MOVT_ABS}, 1743 {BFD_RELOC_ARM_THUMB_MOVW_PCREL, R_ARM_THM_MOVW_PREL_NC}, 1744 {BFD_RELOC_ARM_THUMB_MOVT_PCREL, R_ARM_THM_MOVT_PREL}, 1745 {BFD_RELOC_ARM_ALU_PC_G0_NC, R_ARM_ALU_PC_G0_NC}, 1746 {BFD_RELOC_ARM_ALU_PC_G0, R_ARM_ALU_PC_G0}, 1747 {BFD_RELOC_ARM_ALU_PC_G1_NC, R_ARM_ALU_PC_G1_NC}, 1748 {BFD_RELOC_ARM_ALU_PC_G1, R_ARM_ALU_PC_G1}, 1749 {BFD_RELOC_ARM_ALU_PC_G2, R_ARM_ALU_PC_G2}, 1750 {BFD_RELOC_ARM_LDR_PC_G0, R_ARM_LDR_PC_G0}, 1751 {BFD_RELOC_ARM_LDR_PC_G1, R_ARM_LDR_PC_G1}, 1752 {BFD_RELOC_ARM_LDR_PC_G2, R_ARM_LDR_PC_G2}, 1753 {BFD_RELOC_ARM_LDRS_PC_G0, R_ARM_LDRS_PC_G0}, 1754 {BFD_RELOC_ARM_LDRS_PC_G1, R_ARM_LDRS_PC_G1}, 1755 {BFD_RELOC_ARM_LDRS_PC_G2, R_ARM_LDRS_PC_G2}, 1756 {BFD_RELOC_ARM_LDC_PC_G0, R_ARM_LDC_PC_G0}, 1757 {BFD_RELOC_ARM_LDC_PC_G1, R_ARM_LDC_PC_G1}, 1758 {BFD_RELOC_ARM_LDC_PC_G2, R_ARM_LDC_PC_G2}, 1759 {BFD_RELOC_ARM_ALU_SB_G0_NC, R_ARM_ALU_SB_G0_NC}, 1760 {BFD_RELOC_ARM_ALU_SB_G0, R_ARM_ALU_SB_G0}, 1761 {BFD_RELOC_ARM_ALU_SB_G1_NC, R_ARM_ALU_SB_G1_NC}, 1762 {BFD_RELOC_ARM_ALU_SB_G1, R_ARM_ALU_SB_G1}, 1763 {BFD_RELOC_ARM_ALU_SB_G2, R_ARM_ALU_SB_G2}, 1764 {BFD_RELOC_ARM_LDR_SB_G0, R_ARM_LDR_SB_G0}, 1765 {BFD_RELOC_ARM_LDR_SB_G1, R_ARM_LDR_SB_G1}, 1766 {BFD_RELOC_ARM_LDR_SB_G2, R_ARM_LDR_SB_G2}, 1767 {BFD_RELOC_ARM_LDRS_SB_G0, R_ARM_LDRS_SB_G0}, 1768 {BFD_RELOC_ARM_LDRS_SB_G1, R_ARM_LDRS_SB_G1}, 1769 {BFD_RELOC_ARM_LDRS_SB_G2, R_ARM_LDRS_SB_G2}, 1770 {BFD_RELOC_ARM_LDC_SB_G0, R_ARM_LDC_SB_G0}, 1771 {BFD_RELOC_ARM_LDC_SB_G1, R_ARM_LDC_SB_G1}, 1772 {BFD_RELOC_ARM_LDC_SB_G2, R_ARM_LDC_SB_G2}, 1773 {BFD_RELOC_ARM_V4BX, R_ARM_V4BX} 1774 }; 1775 1776 static reloc_howto_type * 1777 elf32_arm_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1778 bfd_reloc_code_real_type code) 1779 { 1780 unsigned int i; 1781 1782 for (i = 0; i < ARRAY_SIZE (elf32_arm_reloc_map); i ++) 1783 if (elf32_arm_reloc_map[i].bfd_reloc_val == code) 1784 return elf32_arm_howto_from_type (elf32_arm_reloc_map[i].elf_reloc_val); 1785 1786 return NULL; 1787 } 1788 1789 static reloc_howto_type * 1790 elf32_arm_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1791 const char *r_name) 1792 { 1793 unsigned int i; 1794 1795 for (i = 0; i < ARRAY_SIZE (elf32_arm_howto_table_1); i++) 1796 if (elf32_arm_howto_table_1[i].name != NULL 1797 && strcasecmp (elf32_arm_howto_table_1[i].name, r_name) == 0) 1798 return &elf32_arm_howto_table_1[i]; 1799 1800 for (i = 0; i < ARRAY_SIZE (elf32_arm_howto_table_2); i++) 1801 if (elf32_arm_howto_table_2[i].name != NULL 1802 && strcasecmp (elf32_arm_howto_table_2[i].name, r_name) == 0) 1803 return &elf32_arm_howto_table_2[i]; 1804 1805 return NULL; 1806 } 1807 1808 /* Support for core dump NOTE sections. */ 1809 1810 static bfd_boolean 1811 elf32_arm_nabi_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 1812 { 1813 int offset; 1814 size_t size; 1815 1816 switch (note->descsz) 1817 { 1818 default: 1819 return FALSE; 1820 1821 case 148: /* Linux/ARM 32-bit. */ 1822 /* pr_cursig */ 1823 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 1824 1825 /* pr_pid */ 1826 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 1827 1828 /* pr_reg */ 1829 offset = 72; 1830 size = 72; 1831 1832 break; 1833 } 1834 1835 /* Make a ".reg/999" section. */ 1836 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 1837 size, note->descpos + offset); 1838 } 1839 1840 static bfd_boolean 1841 elf32_arm_nabi_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 1842 { 1843 switch (note->descsz) 1844 { 1845 default: 1846 return FALSE; 1847 1848 case 124: /* Linux/ARM elf_prpsinfo. */ 1849 elf_tdata (abfd)->core_program 1850 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 1851 elf_tdata (abfd)->core_command 1852 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 1853 } 1854 1855 /* Note that for some reason, a spurious space is tacked 1856 onto the end of the args in some (at least one anyway) 1857 implementations, so strip it off if it exists. */ 1858 { 1859 char *command = elf_tdata (abfd)->core_command; 1860 int n = strlen (command); 1861 1862 if (0 < n && command[n - 1] == ' ') 1863 command[n - 1] = '\0'; 1864 } 1865 1866 return TRUE; 1867 } 1868 1869 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_vec 1870 #define TARGET_LITTLE_NAME "elf32-littlearm" 1871 #define TARGET_BIG_SYM bfd_elf32_bigarm_vec 1872 #define TARGET_BIG_NAME "elf32-bigarm" 1873 1874 #define elf_backend_grok_prstatus elf32_arm_nabi_grok_prstatus 1875 #define elf_backend_grok_psinfo elf32_arm_nabi_grok_psinfo 1876 1877 typedef unsigned long int insn32; 1878 typedef unsigned short int insn16; 1879 1880 /* In lieu of proper flags, assume all EABIv4 or later objects are 1881 interworkable. */ 1882 #define INTERWORK_FLAG(abfd) \ 1883 (EF_ARM_EABI_VERSION (elf_elfheader (abfd)->e_flags) >= EF_ARM_EABI_VER4 \ 1884 || (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK)) 1885 1886 /* The linker script knows the section names for placement. 1887 The entry_names are used to do simple name mangling on the stubs. 1888 Given a function name, and its type, the stub can be found. The 1889 name can be changed. The only requirement is the %s be present. */ 1890 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" 1891 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" 1892 1893 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" 1894 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" 1895 1896 #define VFP11_ERRATUM_VENEER_SECTION_NAME ".vfp11_veneer" 1897 #define VFP11_ERRATUM_VENEER_ENTRY_NAME "__vfp11_veneer_%x" 1898 1899 #define ARM_BX_GLUE_SECTION_NAME ".v4_bx" 1900 #define ARM_BX_GLUE_ENTRY_NAME "__bx_r%d" 1901 1902 #define STUB_ENTRY_NAME "__%s_veneer" 1903 1904 /* The name of the dynamic interpreter. This is put in the .interp 1905 section. */ 1906 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 1907 1908 #ifdef FOUR_WORD_PLT 1909 1910 /* The first entry in a procedure linkage table looks like 1911 this. It is set up so that any shared library function that is 1912 called before the relocation has been set up calls the dynamic 1913 linker first. */ 1914 static const bfd_vma elf32_arm_plt0_entry [] = 1915 { 1916 0xe52de004, /* str lr, [sp, #-4]! */ 1917 0xe59fe010, /* ldr lr, [pc, #16] */ 1918 0xe08fe00e, /* add lr, pc, lr */ 1919 0xe5bef008, /* ldr pc, [lr, #8]! */ 1920 }; 1921 1922 /* Subsequent entries in a procedure linkage table look like 1923 this. */ 1924 static const bfd_vma elf32_arm_plt_entry [] = 1925 { 1926 0xe28fc600, /* add ip, pc, #NN */ 1927 0xe28cca00, /* add ip, ip, #NN */ 1928 0xe5bcf000, /* ldr pc, [ip, #NN]! */ 1929 0x00000000, /* unused */ 1930 }; 1931 1932 #else 1933 1934 /* The first entry in a procedure linkage table looks like 1935 this. It is set up so that any shared library function that is 1936 called before the relocation has been set up calls the dynamic 1937 linker first. */ 1938 static const bfd_vma elf32_arm_plt0_entry [] = 1939 { 1940 0xe52de004, /* str lr, [sp, #-4]! */ 1941 0xe59fe004, /* ldr lr, [pc, #4] */ 1942 0xe08fe00e, /* add lr, pc, lr */ 1943 0xe5bef008, /* ldr pc, [lr, #8]! */ 1944 0x00000000, /* &GOT[0] - . */ 1945 }; 1946 1947 /* Subsequent entries in a procedure linkage table look like 1948 this. */ 1949 static const bfd_vma elf32_arm_plt_entry [] = 1950 { 1951 0xe28fc600, /* add ip, pc, #0xNN00000 */ 1952 0xe28cca00, /* add ip, ip, #0xNN000 */ 1953 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */ 1954 }; 1955 1956 #endif 1957 1958 /* The format of the first entry in the procedure linkage table 1959 for a VxWorks executable. */ 1960 static const bfd_vma elf32_arm_vxworks_exec_plt0_entry[] = 1961 { 1962 0xe52dc008, /* str ip,[sp,#-8]! */ 1963 0xe59fc000, /* ldr ip,[pc] */ 1964 0xe59cf008, /* ldr pc,[ip,#8] */ 1965 0x00000000, /* .long _GLOBAL_OFFSET_TABLE_ */ 1966 }; 1967 1968 /* The format of subsequent entries in a VxWorks executable. */ 1969 static const bfd_vma elf32_arm_vxworks_exec_plt_entry[] = 1970 { 1971 0xe59fc000, /* ldr ip,[pc] */ 1972 0xe59cf000, /* ldr pc,[ip] */ 1973 0x00000000, /* .long @got */ 1974 0xe59fc000, /* ldr ip,[pc] */ 1975 0xea000000, /* b _PLT */ 1976 0x00000000, /* .long @pltindex*sizeof(Elf32_Rela) */ 1977 }; 1978 1979 /* The format of entries in a VxWorks shared library. */ 1980 static const bfd_vma elf32_arm_vxworks_shared_plt_entry[] = 1981 { 1982 0xe59fc000, /* ldr ip,[pc] */ 1983 0xe79cf009, /* ldr pc,[ip,r9] */ 1984 0x00000000, /* .long @got */ 1985 0xe59fc000, /* ldr ip,[pc] */ 1986 0xe599f008, /* ldr pc,[r9,#8] */ 1987 0x00000000, /* .long @pltindex*sizeof(Elf32_Rela) */ 1988 }; 1989 1990 /* An initial stub used if the PLT entry is referenced from Thumb code. */ 1991 #define PLT_THUMB_STUB_SIZE 4 1992 static const bfd_vma elf32_arm_plt_thumb_stub [] = 1993 { 1994 0x4778, /* bx pc */ 1995 0x46c0 /* nop */ 1996 }; 1997 1998 /* The entries in a PLT when using a DLL-based target with multiple 1999 address spaces. */ 2000 static const bfd_vma elf32_arm_symbian_plt_entry [] = 2001 { 2002 0xe51ff004, /* ldr pc, [pc, #-4] */ 2003 0x00000000, /* dcd R_ARM_GLOB_DAT(X) */ 2004 }; 2005 2006 #define ARM_MAX_FWD_BRANCH_OFFSET ((((1 << 23) - 1) << 2) + 8) 2007 #define ARM_MAX_BWD_BRANCH_OFFSET ((-((1 << 23) << 2)) + 8) 2008 #define THM_MAX_FWD_BRANCH_OFFSET ((1 << 22) -2 + 4) 2009 #define THM_MAX_BWD_BRANCH_OFFSET (-(1 << 22) + 4) 2010 #define THM2_MAX_FWD_BRANCH_OFFSET (((1 << 24) - 2) + 4) 2011 #define THM2_MAX_BWD_BRANCH_OFFSET (-(1 << 24) + 4) 2012 2013 static const bfd_vma arm_long_branch_stub[] = 2014 { 2015 0xe51ff004, /* ldr pc, [pc, #-4] */ 2016 0x00000000, /* dcd R_ARM_ABS32(X) */ 2017 }; 2018 2019 static const bfd_vma arm_thumb_v4t_long_branch_stub[] = 2020 { 2021 0xe59fc000, /* ldr ip, [pc, #0] */ 2022 0xe12fff1c, /* bx ip */ 2023 0x00000000, /* dcd R_ARM_ABS32(X) */ 2024 }; 2025 2026 static const bfd_vma arm_thumb_thumb_long_branch_stub[] = 2027 { 2028 0x4e02b540, /* push {r6, lr} */ 2029 /* ldr r6, [pc, #8] */ 2030 0x473046fe, /* mov lr, pc */ 2031 /* bx r6 */ 2032 0xbf00bd40, /* pop {r6, pc} */ 2033 /* nop */ 2034 0x00000000, /* dcd R_ARM_ABS32(X) */ 2035 }; 2036 2037 static const bfd_vma arm_thumb_arm_v4t_long_branch_stub[] = 2038 { 2039 0x4e03b540, /* push {r6, lr} */ 2040 /* ldr r6, [pc, #12] */ 2041 0x473046fe, /* mov lr, pc */ 2042 /* bx r6 */ 2043 0xe8bd4040, /* pop {r6, pc} */ 2044 0xe12fff1e, /* bx lr */ 2045 0x00000000, /* dcd R_ARM_ABS32(X) */ 2046 }; 2047 2048 static const bfd_vma arm_thumb_arm_v4t_short_branch_stub[] = 2049 { 2050 0x46c04778, /* bx pc */ 2051 /* nop */ 2052 0xea000000, /* b (X) */ 2053 }; 2054 2055 static const bfd_vma arm_pic_long_branch_stub[] = 2056 { 2057 0xe59fc000, /* ldr r12, [pc] */ 2058 0xe08ff00c, /* add pc, pc, ip */ 2059 0x00000000, /* dcd R_ARM_REL32(X) */ 2060 }; 2061 2062 /* Section name for stubs is the associated section name plus this 2063 string. */ 2064 #define STUB_SUFFIX ".stub" 2065 2066 enum elf32_arm_stub_type 2067 { 2068 arm_stub_none, 2069 arm_stub_long_branch, 2070 arm_thumb_v4t_stub_long_branch, 2071 arm_thumb_thumb_stub_long_branch, 2072 arm_thumb_arm_v4t_stub_long_branch, 2073 arm_thumb_arm_v4t_stub_short_branch, 2074 arm_stub_pic_long_branch, 2075 }; 2076 2077 struct elf32_arm_stub_hash_entry 2078 { 2079 /* Base hash table entry structure. */ 2080 struct bfd_hash_entry root; 2081 2082 /* The stub section. */ 2083 asection *stub_sec; 2084 2085 /* Offset within stub_sec of the beginning of this stub. */ 2086 bfd_vma stub_offset; 2087 2088 /* Given the symbol's value and its section we can determine its final 2089 value when building the stubs (so the stub knows where to jump). */ 2090 bfd_vma target_value; 2091 asection *target_section; 2092 2093 enum elf32_arm_stub_type stub_type; 2094 2095 /* The symbol table entry, if any, that this was derived from. */ 2096 struct elf32_arm_link_hash_entry *h; 2097 2098 /* Destination symbol type (STT_ARM_TFUNC, ...) */ 2099 unsigned char st_type; 2100 2101 /* Where this stub is being called from, or, in the case of combined 2102 stub sections, the first input section in the group. */ 2103 asection *id_sec; 2104 2105 /* The name for the local symbol at the start of this stub. The 2106 stub name in the hash table has to be unique; this does not, so 2107 it can be friendlier. */ 2108 char *output_name; 2109 }; 2110 2111 /* Used to build a map of a section. This is required for mixed-endian 2112 code/data. */ 2113 2114 typedef struct elf32_elf_section_map 2115 { 2116 bfd_vma vma; 2117 char type; 2118 } 2119 elf32_arm_section_map; 2120 2121 /* Information about a VFP11 erratum veneer, or a branch to such a veneer. */ 2122 2123 typedef enum 2124 { 2125 VFP11_ERRATUM_BRANCH_TO_ARM_VENEER, 2126 VFP11_ERRATUM_BRANCH_TO_THUMB_VENEER, 2127 VFP11_ERRATUM_ARM_VENEER, 2128 VFP11_ERRATUM_THUMB_VENEER 2129 } 2130 elf32_vfp11_erratum_type; 2131 2132 typedef struct elf32_vfp11_erratum_list 2133 { 2134 struct elf32_vfp11_erratum_list *next; 2135 bfd_vma vma; 2136 union 2137 { 2138 struct 2139 { 2140 struct elf32_vfp11_erratum_list *veneer; 2141 unsigned int vfp_insn; 2142 } b; 2143 struct 2144 { 2145 struct elf32_vfp11_erratum_list *branch; 2146 unsigned int id; 2147 } v; 2148 } u; 2149 elf32_vfp11_erratum_type type; 2150 } 2151 elf32_vfp11_erratum_list; 2152 2153 typedef struct _arm_elf_section_data 2154 { 2155 struct bfd_elf_section_data elf; 2156 unsigned int mapcount; 2157 unsigned int mapsize; 2158 elf32_arm_section_map *map; 2159 unsigned int erratumcount; 2160 elf32_vfp11_erratum_list *erratumlist; 2161 } 2162 _arm_elf_section_data; 2163 2164 #define elf32_arm_section_data(sec) \ 2165 ((_arm_elf_section_data *) elf_section_data (sec)) 2166 2167 /* The size of the thread control block. */ 2168 #define TCB_SIZE 8 2169 2170 struct elf_arm_obj_tdata 2171 { 2172 struct elf_obj_tdata root; 2173 2174 /* tls_type for each local got entry. */ 2175 char *local_got_tls_type; 2176 2177 /* Zero to warn when linking objects with incompatible enum sizes. */ 2178 int no_enum_size_warning; 2179 2180 /* Zero to warn when linking objects with incompatible wchar_t sizes. */ 2181 int no_wchar_size_warning; 2182 }; 2183 2184 #define elf_arm_tdata(bfd) \ 2185 ((struct elf_arm_obj_tdata *) (bfd)->tdata.any) 2186 2187 #define elf32_arm_local_got_tls_type(bfd) \ 2188 (elf_arm_tdata (bfd)->local_got_tls_type) 2189 2190 #define is_arm_elf(bfd) \ 2191 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 2192 && elf_tdata (bfd) != NULL \ 2193 && elf_object_id (bfd) == ARM_ELF_TDATA) 2194 2195 static bfd_boolean 2196 elf32_arm_mkobject (bfd *abfd) 2197 { 2198 return bfd_elf_allocate_object (abfd, sizeof (struct elf_arm_obj_tdata), 2199 ARM_ELF_TDATA); 2200 } 2201 2202 /* The ARM linker needs to keep track of the number of relocs that it 2203 decides to copy in check_relocs for each symbol. This is so that 2204 it can discard PC relative relocs if it doesn't need them when 2205 linking with -Bsymbolic. We store the information in a field 2206 extending the regular ELF linker hash table. */ 2207 2208 /* This structure keeps track of the number of relocs we have copied 2209 for a given symbol. */ 2210 struct elf32_arm_relocs_copied 2211 { 2212 /* Next section. */ 2213 struct elf32_arm_relocs_copied * next; 2214 /* A section in dynobj. */ 2215 asection * section; 2216 /* Number of relocs copied in this section. */ 2217 bfd_size_type count; 2218 /* Number of PC-relative relocs copied in this section. */ 2219 bfd_size_type pc_count; 2220 }; 2221 2222 #define elf32_arm_hash_entry(ent) ((struct elf32_arm_link_hash_entry *)(ent)) 2223 2224 /* Arm ELF linker hash entry. */ 2225 struct elf32_arm_link_hash_entry 2226 { 2227 struct elf_link_hash_entry root; 2228 2229 /* Number of PC relative relocs copied for this symbol. */ 2230 struct elf32_arm_relocs_copied * relocs_copied; 2231 2232 /* We reference count Thumb references to a PLT entry separately, 2233 so that we can emit the Thumb trampoline only if needed. */ 2234 bfd_signed_vma plt_thumb_refcount; 2235 2236 /* Some references from Thumb code may be eliminated by BL->BLX 2237 conversion, so record them separately. */ 2238 bfd_signed_vma plt_maybe_thumb_refcount; 2239 2240 /* Since PLT entries have variable size if the Thumb prologue is 2241 used, we need to record the index into .got.plt instead of 2242 recomputing it from the PLT offset. */ 2243 bfd_signed_vma plt_got_offset; 2244 2245 #define GOT_UNKNOWN 0 2246 #define GOT_NORMAL 1 2247 #define GOT_TLS_GD 2 2248 #define GOT_TLS_IE 4 2249 unsigned char tls_type; 2250 2251 /* The symbol marking the real symbol location for exported thumb 2252 symbols with Arm stubs. */ 2253 struct elf_link_hash_entry *export_glue; 2254 2255 /* A pointer to the most recently used stub hash entry against this 2256 symbol. */ 2257 struct elf32_arm_stub_hash_entry *stub_cache; 2258 }; 2259 2260 /* Traverse an arm ELF linker hash table. */ 2261 #define elf32_arm_link_hash_traverse(table, func, info) \ 2262 (elf_link_hash_traverse \ 2263 (&(table)->root, \ 2264 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ 2265 (info))) 2266 2267 /* Get the ARM elf linker hash table from a link_info structure. */ 2268 #define elf32_arm_hash_table(info) \ 2269 ((struct elf32_arm_link_hash_table *) ((info)->hash)) 2270 2271 #define arm_stub_hash_lookup(table, string, create, copy) \ 2272 ((struct elf32_arm_stub_hash_entry *) \ 2273 bfd_hash_lookup ((table), (string), (create), (copy))) 2274 2275 /* ARM ELF linker hash table. */ 2276 struct elf32_arm_link_hash_table 2277 { 2278 /* The main hash table. */ 2279 struct elf_link_hash_table root; 2280 2281 /* The size in bytes of the section containing the Thumb-to-ARM glue. */ 2282 bfd_size_type thumb_glue_size; 2283 2284 /* The size in bytes of the section containing the ARM-to-Thumb glue. */ 2285 bfd_size_type arm_glue_size; 2286 2287 /* The size in bytes of section containing the ARMv4 BX veneers. */ 2288 bfd_size_type bx_glue_size; 2289 2290 /* Offsets of ARMv4 BX veneers. Bit1 set if present, and Bit0 set when 2291 veneer has been populated. */ 2292 bfd_vma bx_glue_offset[15]; 2293 2294 /* The size in bytes of the section containing glue for VFP11 erratum 2295 veneers. */ 2296 bfd_size_type vfp11_erratum_glue_size; 2297 2298 /* An arbitrary input BFD chosen to hold the glue sections. */ 2299 bfd * bfd_of_glue_owner; 2300 2301 /* Nonzero to output a BE8 image. */ 2302 int byteswap_code; 2303 2304 /* Zero if R_ARM_TARGET1 means R_ARM_ABS32. 2305 Nonzero if R_ARM_TARGET1 means R_ARM_REL32. */ 2306 int target1_is_rel; 2307 2308 /* The relocation to use for R_ARM_TARGET2 relocations. */ 2309 int target2_reloc; 2310 2311 /* 0 = Ignore R_ARM_V4BX. 2312 1 = Convert BX to MOV PC. 2313 2 = Generate v4 interworing stubs. */ 2314 int fix_v4bx; 2315 2316 /* Nonzero if the ARM/Thumb BLX instructions are available for use. */ 2317 int use_blx; 2318 2319 /* What sort of code sequences we should look for which may trigger the 2320 VFP11 denorm erratum. */ 2321 bfd_arm_vfp11_fix vfp11_fix; 2322 2323 /* Global counter for the number of fixes we have emitted. */ 2324 int num_vfp11_fixes; 2325 2326 /* Nonzero to force PIC branch veneers. */ 2327 int pic_veneer; 2328 2329 /* The number of bytes in the initial entry in the PLT. */ 2330 bfd_size_type plt_header_size; 2331 2332 /* The number of bytes in the subsequent PLT etries. */ 2333 bfd_size_type plt_entry_size; 2334 2335 /* True if the target system is VxWorks. */ 2336 int vxworks_p; 2337 2338 /* True if the target system is Symbian OS. */ 2339 int symbian_p; 2340 2341 /* True if the target uses REL relocations. */ 2342 int use_rel; 2343 2344 /* Short-cuts to get to dynamic linker sections. */ 2345 asection *sgot; 2346 asection *sgotplt; 2347 asection *srelgot; 2348 asection *splt; 2349 asection *srelplt; 2350 asection *sdynbss; 2351 asection *srelbss; 2352 2353 /* The (unloaded but important) VxWorks .rela.plt.unloaded section. */ 2354 asection *srelplt2; 2355 2356 /* Data for R_ARM_TLS_LDM32 relocations. */ 2357 union 2358 { 2359 bfd_signed_vma refcount; 2360 bfd_vma offset; 2361 } tls_ldm_got; 2362 2363 /* Small local sym to section mapping cache. */ 2364 struct sym_sec_cache sym_sec; 2365 2366 /* For convenience in allocate_dynrelocs. */ 2367 bfd * obfd; 2368 2369 /* The stub hash table. */ 2370 struct bfd_hash_table stub_hash_table; 2371 2372 /* Linker stub bfd. */ 2373 bfd *stub_bfd; 2374 2375 /* Linker call-backs. */ 2376 asection * (*add_stub_section) (const char *, asection *); 2377 void (*layout_sections_again) (void); 2378 2379 /* Array to keep track of which stub sections have been created, and 2380 information on stub grouping. */ 2381 struct map_stub 2382 { 2383 /* This is the section to which stubs in the group will be 2384 attached. */ 2385 asection *link_sec; 2386 /* The stub section. */ 2387 asection *stub_sec; 2388 } *stub_group; 2389 2390 /* Assorted information used by elf32_arm_size_stubs. */ 2391 unsigned int bfd_count; 2392 int top_index; 2393 asection **input_list; 2394 }; 2395 2396 /* Create an entry in an ARM ELF linker hash table. */ 2397 2398 static struct bfd_hash_entry * 2399 elf32_arm_link_hash_newfunc (struct bfd_hash_entry * entry, 2400 struct bfd_hash_table * table, 2401 const char * string) 2402 { 2403 struct elf32_arm_link_hash_entry * ret = 2404 (struct elf32_arm_link_hash_entry *) entry; 2405 2406 /* Allocate the structure if it has not already been allocated by a 2407 subclass. */ 2408 if (ret == NULL) 2409 ret = bfd_hash_allocate (table, sizeof (struct elf32_arm_link_hash_entry)); 2410 if (ret == NULL) 2411 return (struct bfd_hash_entry *) ret; 2412 2413 /* Call the allocation method of the superclass. */ 2414 ret = ((struct elf32_arm_link_hash_entry *) 2415 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 2416 table, string)); 2417 if (ret != NULL) 2418 { 2419 ret->relocs_copied = NULL; 2420 ret->tls_type = GOT_UNKNOWN; 2421 ret->plt_thumb_refcount = 0; 2422 ret->plt_maybe_thumb_refcount = 0; 2423 ret->plt_got_offset = -1; 2424 ret->export_glue = NULL; 2425 2426 ret->stub_cache = NULL; 2427 } 2428 2429 return (struct bfd_hash_entry *) ret; 2430 } 2431 2432 /* Initialize an entry in the stub hash table. */ 2433 2434 static struct bfd_hash_entry * 2435 stub_hash_newfunc (struct bfd_hash_entry *entry, 2436 struct bfd_hash_table *table, 2437 const char *string) 2438 { 2439 /* Allocate the structure if it has not already been allocated by a 2440 subclass. */ 2441 if (entry == NULL) 2442 { 2443 entry = bfd_hash_allocate (table, 2444 sizeof (struct elf32_arm_stub_hash_entry)); 2445 if (entry == NULL) 2446 return entry; 2447 } 2448 2449 /* Call the allocation method of the superclass. */ 2450 entry = bfd_hash_newfunc (entry, table, string); 2451 if (entry != NULL) 2452 { 2453 struct elf32_arm_stub_hash_entry *eh; 2454 2455 /* Initialize the local fields. */ 2456 eh = (struct elf32_arm_stub_hash_entry *) entry; 2457 eh->stub_sec = NULL; 2458 eh->stub_offset = 0; 2459 eh->target_value = 0; 2460 eh->target_section = NULL; 2461 eh->stub_type = arm_stub_none; 2462 eh->h = NULL; 2463 eh->id_sec = NULL; 2464 } 2465 2466 return entry; 2467 } 2468 2469 /* Return true if NAME is the name of the relocation section associated 2470 with S. */ 2471 2472 static bfd_boolean 2473 reloc_section_p (struct elf32_arm_link_hash_table *htab, 2474 const char *name, asection *s) 2475 { 2476 if (htab->use_rel) 2477 return CONST_STRNEQ (name, ".rel") && strcmp (s->name, name + 4) == 0; 2478 else 2479 return CONST_STRNEQ (name, ".rela") && strcmp (s->name, name + 5) == 0; 2480 } 2481 2482 /* Create .got, .gotplt, and .rel(a).got sections in DYNOBJ, and set up 2483 shortcuts to them in our hash table. */ 2484 2485 static bfd_boolean 2486 create_got_section (bfd *dynobj, struct bfd_link_info *info) 2487 { 2488 struct elf32_arm_link_hash_table *htab; 2489 2490 htab = elf32_arm_hash_table (info); 2491 /* BPABI objects never have a GOT, or associated sections. */ 2492 if (htab->symbian_p) 2493 return TRUE; 2494 2495 if (! _bfd_elf_create_got_section (dynobj, info)) 2496 return FALSE; 2497 2498 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 2499 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 2500 if (!htab->sgot || !htab->sgotplt) 2501 abort (); 2502 2503 htab->srelgot = bfd_make_section_with_flags (dynobj, 2504 RELOC_SECTION (htab, ".got"), 2505 (SEC_ALLOC | SEC_LOAD 2506 | SEC_HAS_CONTENTS 2507 | SEC_IN_MEMORY 2508 | SEC_LINKER_CREATED 2509 | SEC_READONLY)); 2510 if (htab->srelgot == NULL 2511 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) 2512 return FALSE; 2513 return TRUE; 2514 } 2515 2516 /* Create .plt, .rel(a).plt, .got, .got.plt, .rel(a).got, .dynbss, and 2517 .rel(a).bss sections in DYNOBJ, and set up shortcuts to them in our 2518 hash table. */ 2519 2520 static bfd_boolean 2521 elf32_arm_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 2522 { 2523 struct elf32_arm_link_hash_table *htab; 2524 2525 htab = elf32_arm_hash_table (info); 2526 if (!htab->sgot && !create_got_section (dynobj, info)) 2527 return FALSE; 2528 2529 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 2530 return FALSE; 2531 2532 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 2533 htab->srelplt = bfd_get_section_by_name (dynobj, 2534 RELOC_SECTION (htab, ".plt")); 2535 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 2536 if (!info->shared) 2537 htab->srelbss = bfd_get_section_by_name (dynobj, 2538 RELOC_SECTION (htab, ".bss")); 2539 2540 if (htab->vxworks_p) 2541 { 2542 if (!elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2)) 2543 return FALSE; 2544 2545 if (info->shared) 2546 { 2547 htab->plt_header_size = 0; 2548 htab->plt_entry_size 2549 = 4 * ARRAY_SIZE (elf32_arm_vxworks_shared_plt_entry); 2550 } 2551 else 2552 { 2553 htab->plt_header_size 2554 = 4 * ARRAY_SIZE (elf32_arm_vxworks_exec_plt0_entry); 2555 htab->plt_entry_size 2556 = 4 * ARRAY_SIZE (elf32_arm_vxworks_exec_plt_entry); 2557 } 2558 } 2559 2560 if (!htab->splt 2561 || !htab->srelplt 2562 || !htab->sdynbss 2563 || (!info->shared && !htab->srelbss)) 2564 abort (); 2565 2566 return TRUE; 2567 } 2568 2569 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 2570 2571 static void 2572 elf32_arm_copy_indirect_symbol (struct bfd_link_info *info, 2573 struct elf_link_hash_entry *dir, 2574 struct elf_link_hash_entry *ind) 2575 { 2576 struct elf32_arm_link_hash_entry *edir, *eind; 2577 2578 edir = (struct elf32_arm_link_hash_entry *) dir; 2579 eind = (struct elf32_arm_link_hash_entry *) ind; 2580 2581 if (eind->relocs_copied != NULL) 2582 { 2583 if (edir->relocs_copied != NULL) 2584 { 2585 struct elf32_arm_relocs_copied **pp; 2586 struct elf32_arm_relocs_copied *p; 2587 2588 /* Add reloc counts against the indirect sym to the direct sym 2589 list. Merge any entries against the same section. */ 2590 for (pp = &eind->relocs_copied; (p = *pp) != NULL; ) 2591 { 2592 struct elf32_arm_relocs_copied *q; 2593 2594 for (q = edir->relocs_copied; q != NULL; q = q->next) 2595 if (q->section == p->section) 2596 { 2597 q->pc_count += p->pc_count; 2598 q->count += p->count; 2599 *pp = p->next; 2600 break; 2601 } 2602 if (q == NULL) 2603 pp = &p->next; 2604 } 2605 *pp = edir->relocs_copied; 2606 } 2607 2608 edir->relocs_copied = eind->relocs_copied; 2609 eind->relocs_copied = NULL; 2610 } 2611 2612 if (ind->root.type == bfd_link_hash_indirect) 2613 { 2614 /* Copy over PLT info. */ 2615 edir->plt_thumb_refcount += eind->plt_thumb_refcount; 2616 eind->plt_thumb_refcount = 0; 2617 edir->plt_maybe_thumb_refcount += eind->plt_maybe_thumb_refcount; 2618 eind->plt_maybe_thumb_refcount = 0; 2619 2620 if (dir->got.refcount <= 0) 2621 { 2622 edir->tls_type = eind->tls_type; 2623 eind->tls_type = GOT_UNKNOWN; 2624 } 2625 } 2626 2627 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 2628 } 2629 2630 /* Create an ARM elf linker hash table. */ 2631 2632 static struct bfd_link_hash_table * 2633 elf32_arm_link_hash_table_create (bfd *abfd) 2634 { 2635 struct elf32_arm_link_hash_table *ret; 2636 bfd_size_type amt = sizeof (struct elf32_arm_link_hash_table); 2637 2638 ret = bfd_malloc (amt); 2639 if (ret == NULL) 2640 return NULL; 2641 2642 if (!_bfd_elf_link_hash_table_init (& ret->root, abfd, 2643 elf32_arm_link_hash_newfunc, 2644 sizeof (struct elf32_arm_link_hash_entry))) 2645 { 2646 free (ret); 2647 return NULL; 2648 } 2649 2650 ret->sgot = NULL; 2651 ret->sgotplt = NULL; 2652 ret->srelgot = NULL; 2653 ret->splt = NULL; 2654 ret->srelplt = NULL; 2655 ret->sdynbss = NULL; 2656 ret->srelbss = NULL; 2657 ret->srelplt2 = NULL; 2658 ret->thumb_glue_size = 0; 2659 ret->arm_glue_size = 0; 2660 ret->bx_glue_size = 0; 2661 memset (ret->bx_glue_offset, 0, sizeof (ret->bx_glue_offset)); 2662 ret->vfp11_fix = BFD_ARM_VFP11_FIX_NONE; 2663 ret->vfp11_erratum_glue_size = 0; 2664 ret->num_vfp11_fixes = 0; 2665 ret->bfd_of_glue_owner = NULL; 2666 ret->byteswap_code = 0; 2667 ret->target1_is_rel = 0; 2668 ret->target2_reloc = R_ARM_NONE; 2669 #ifdef FOUR_WORD_PLT 2670 ret->plt_header_size = 16; 2671 ret->plt_entry_size = 16; 2672 #else 2673 ret->plt_header_size = 20; 2674 ret->plt_entry_size = 12; 2675 #endif 2676 ret->fix_v4bx = 0; 2677 ret->use_blx = 0; 2678 ret->vxworks_p = 0; 2679 ret->symbian_p = 0; 2680 ret->use_rel = 1; 2681 ret->sym_sec.abfd = NULL; 2682 ret->obfd = abfd; 2683 ret->tls_ldm_got.refcount = 0; 2684 ret->stub_bfd = NULL; 2685 ret->add_stub_section = NULL; 2686 ret->layout_sections_again = NULL; 2687 ret->stub_group = NULL; 2688 ret->bfd_count = 0; 2689 ret->top_index = 0; 2690 ret->input_list = NULL; 2691 2692 if (!bfd_hash_table_init (&ret->stub_hash_table, stub_hash_newfunc, 2693 sizeof (struct elf32_arm_stub_hash_entry))) 2694 { 2695 free (ret); 2696 return NULL; 2697 } 2698 2699 return &ret->root.root; 2700 } 2701 2702 /* Free the derived linker hash table. */ 2703 2704 static void 2705 elf32_arm_hash_table_free (struct bfd_link_hash_table *hash) 2706 { 2707 struct elf32_arm_link_hash_table *ret 2708 = (struct elf32_arm_link_hash_table *) hash; 2709 2710 bfd_hash_table_free (&ret->stub_hash_table); 2711 _bfd_generic_link_hash_table_free (hash); 2712 } 2713 2714 /* Determine if we're dealing with a Thumb only architecture. */ 2715 2716 static bfd_boolean 2717 using_thumb_only (struct elf32_arm_link_hash_table *globals) 2718 { 2719 int arch = bfd_elf_get_obj_attr_int (globals->obfd, OBJ_ATTR_PROC, 2720 Tag_CPU_arch); 2721 int profile; 2722 2723 if (arch != TAG_CPU_ARCH_V7) 2724 return FALSE; 2725 2726 profile = bfd_elf_get_obj_attr_int (globals->obfd, OBJ_ATTR_PROC, 2727 Tag_CPU_arch_profile); 2728 2729 return profile == 'M'; 2730 } 2731 2732 /* Determine if we're dealing with a Thumb-2 object. */ 2733 2734 static bfd_boolean 2735 using_thumb2 (struct elf32_arm_link_hash_table *globals) 2736 { 2737 int arch = bfd_elf_get_obj_attr_int (globals->obfd, OBJ_ATTR_PROC, 2738 Tag_CPU_arch); 2739 return arch == TAG_CPU_ARCH_V6T2 || arch >= TAG_CPU_ARCH_V7; 2740 } 2741 2742 static bfd_boolean 2743 arm_stub_is_thumb (enum elf32_arm_stub_type stub_type) 2744 { 2745 switch (stub_type) 2746 { 2747 case arm_thumb_thumb_stub_long_branch: 2748 case arm_thumb_arm_v4t_stub_long_branch: 2749 case arm_thumb_arm_v4t_stub_short_branch: 2750 return TRUE; 2751 case arm_stub_none: 2752 BFD_FAIL (); 2753 return FALSE; 2754 break; 2755 default: 2756 return FALSE; 2757 } 2758 } 2759 2760 /* Determine the type of stub needed, if any, for a call. */ 2761 2762 static enum elf32_arm_stub_type 2763 arm_type_of_stub (struct bfd_link_info *info, 2764 asection *input_sec, 2765 const Elf_Internal_Rela *rel, 2766 unsigned char st_type, 2767 struct elf32_arm_link_hash_entry *hash, 2768 bfd_vma destination, 2769 asection *sym_sec, 2770 bfd *input_bfd, 2771 const char *name) 2772 { 2773 bfd_vma location; 2774 bfd_signed_vma branch_offset; 2775 unsigned int r_type; 2776 struct elf32_arm_link_hash_table * globals; 2777 int thumb2; 2778 int thumb_only; 2779 enum elf32_arm_stub_type stub_type = arm_stub_none; 2780 2781 /* We don't know the actual type of destination in case it is of 2782 type STT_SECTION: give up. */ 2783 if (st_type == STT_SECTION) 2784 return stub_type; 2785 2786 globals = elf32_arm_hash_table (info); 2787 2788 thumb_only = using_thumb_only (globals); 2789 2790 thumb2 = using_thumb2 (globals); 2791 2792 /* Determine where the call point is. */ 2793 location = (input_sec->output_offset 2794 + input_sec->output_section->vma 2795 + rel->r_offset); 2796 2797 branch_offset = (bfd_signed_vma)(destination - location); 2798 2799 r_type = ELF32_R_TYPE (rel->r_info); 2800 2801 /* If the call will go through a PLT entry then we do not need 2802 glue. */ 2803 if (globals->splt != NULL && hash != NULL && hash->root.plt.offset != (bfd_vma) -1) 2804 return stub_type; 2805 2806 if (r_type == R_ARM_THM_CALL) 2807 { 2808 if ((!thumb2 2809 && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET 2810 || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) 2811 || (thumb2 2812 && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET 2813 || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) 2814 || ((st_type != STT_ARM_TFUNC) && !globals->use_blx)) 2815 { 2816 if (st_type == STT_ARM_TFUNC) 2817 { 2818 /* Thumb to thumb. */ 2819 if (!thumb_only) 2820 { 2821 stub_type = (info->shared | globals->pic_veneer) 2822 ? ((globals->use_blx) 2823 ? arm_stub_pic_long_branch 2824 : arm_stub_none) 2825 : (globals->use_blx) 2826 ? arm_stub_long_branch 2827 : arm_stub_none; 2828 } 2829 else 2830 { 2831 stub_type = (info->shared | globals->pic_veneer) 2832 ? arm_stub_none 2833 : (globals->use_blx) 2834 ? arm_thumb_thumb_stub_long_branch 2835 : arm_stub_none; 2836 } 2837 } 2838 else 2839 { 2840 /* Thumb to arm. */ 2841 if (sym_sec != NULL 2842 && sym_sec->owner != NULL 2843 && !INTERWORK_FLAG (sym_sec->owner)) 2844 { 2845 (*_bfd_error_handler) 2846 (_("%B(%s): warning: interworking not enabled.\n" 2847 " first occurrence: %B: Thumb call to ARM"), 2848 sym_sec->owner, input_bfd, name); 2849 } 2850 2851 stub_type = (info->shared | globals->pic_veneer) 2852 ? ((globals->use_blx) 2853 ? arm_stub_pic_long_branch 2854 : arm_stub_none) 2855 : (globals->use_blx) 2856 ? arm_stub_long_branch 2857 : arm_thumb_arm_v4t_stub_long_branch; 2858 2859 /* Handle v4t short branches. */ 2860 if ((stub_type == arm_thumb_arm_v4t_stub_long_branch) 2861 && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET) 2862 && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET)) 2863 stub_type = arm_thumb_arm_v4t_stub_short_branch; 2864 } 2865 } 2866 } 2867 else if (r_type == R_ARM_CALL) 2868 { 2869 if (st_type == STT_ARM_TFUNC) 2870 { 2871 /* Arm to thumb. */ 2872 2873 if (sym_sec != NULL 2874 && sym_sec->owner != NULL 2875 && !INTERWORK_FLAG (sym_sec->owner)) 2876 { 2877 (*_bfd_error_handler) 2878 (_("%B(%s): warning: interworking not enabled.\n" 2879 " first occurrence: %B: Thumb call to ARM"), 2880 sym_sec->owner, input_bfd, name); 2881 } 2882 2883 /* We have an extra 2-bytes reach because of 2884 the mode change (bit 24 (H) of BLX encoding). */ 2885 if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2) 2886 || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) 2887 || !globals->use_blx) 2888 { 2889 stub_type = (info->shared | globals->pic_veneer) 2890 ? arm_stub_pic_long_branch 2891 : (globals->use_blx) 2892 ? arm_stub_long_branch 2893 : arm_thumb_v4t_stub_long_branch; 2894 } 2895 } 2896 else 2897 { 2898 /* Arm to arm. */ 2899 if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET 2900 || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)) 2901 { 2902 stub_type = (info->shared | globals->pic_veneer) 2903 ? arm_stub_pic_long_branch 2904 : arm_stub_long_branch; 2905 } 2906 } 2907 } 2908 2909 return stub_type; 2910 } 2911 2912 /* Build a name for an entry in the stub hash table. */ 2913 2914 static char * 2915 elf32_arm_stub_name (const asection *input_section, 2916 const asection *sym_sec, 2917 const struct elf32_arm_link_hash_entry *hash, 2918 const Elf_Internal_Rela *rel) 2919 { 2920 char *stub_name; 2921 bfd_size_type len; 2922 2923 if (hash) 2924 { 2925 len = 8 + 1 + strlen (hash->root.root.root.string) + 1 + 8 + 1; 2926 stub_name = bfd_malloc (len); 2927 if (stub_name != NULL) 2928 sprintf (stub_name, "%08x_%s+%x", 2929 input_section->id & 0xffffffff, 2930 hash->root.root.root.string, 2931 (int) rel->r_addend & 0xffffffff); 2932 } 2933 else 2934 { 2935 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 2936 stub_name = bfd_malloc (len); 2937 if (stub_name != NULL) 2938 sprintf (stub_name, "%08x_%x:%x+%x", 2939 input_section->id & 0xffffffff, 2940 sym_sec->id & 0xffffffff, 2941 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff, 2942 (int) rel->r_addend & 0xffffffff); 2943 } 2944 2945 return stub_name; 2946 } 2947 2948 /* Look up an entry in the stub hash. Stub entries are cached because 2949 creating the stub name takes a bit of time. */ 2950 2951 static struct elf32_arm_stub_hash_entry * 2952 elf32_arm_get_stub_entry (const asection *input_section, 2953 const asection *sym_sec, 2954 struct elf_link_hash_entry *hash, 2955 const Elf_Internal_Rela *rel, 2956 struct elf32_arm_link_hash_table *htab) 2957 { 2958 struct elf32_arm_stub_hash_entry *stub_entry; 2959 struct elf32_arm_link_hash_entry *h = (struct elf32_arm_link_hash_entry *) hash; 2960 const asection *id_sec; 2961 2962 if ((input_section->flags & SEC_CODE) == 0) 2963 return NULL; 2964 2965 /* If this input section is part of a group of sections sharing one 2966 stub section, then use the id of the first section in the group. 2967 Stub names need to include a section id, as there may well be 2968 more than one stub used to reach say, printf, and we need to 2969 distinguish between them. */ 2970 id_sec = htab->stub_group[input_section->id].link_sec; 2971 2972 if (h != NULL && h->stub_cache != NULL 2973 && h->stub_cache->h == h 2974 && h->stub_cache->id_sec == id_sec) 2975 { 2976 stub_entry = h->stub_cache; 2977 } 2978 else 2979 { 2980 char *stub_name; 2981 2982 stub_name = elf32_arm_stub_name (id_sec, sym_sec, h, rel); 2983 if (stub_name == NULL) 2984 return NULL; 2985 2986 stub_entry = arm_stub_hash_lookup (&htab->stub_hash_table, 2987 stub_name, FALSE, FALSE); 2988 if (h != NULL) 2989 h->stub_cache = stub_entry; 2990 2991 free (stub_name); 2992 } 2993 2994 return stub_entry; 2995 } 2996 2997 /* Add a new stub entry to the stub hash. Not all fields of the new 2998 stub entry are initialised. */ 2999 3000 static struct elf32_arm_stub_hash_entry * 3001 elf32_arm_add_stub (const char *stub_name, 3002 asection *section, 3003 struct elf32_arm_link_hash_table *htab) 3004 { 3005 asection *link_sec; 3006 asection *stub_sec; 3007 struct elf32_arm_stub_hash_entry *stub_entry; 3008 3009 link_sec = htab->stub_group[section->id].link_sec; 3010 stub_sec = htab->stub_group[section->id].stub_sec; 3011 if (stub_sec == NULL) 3012 { 3013 stub_sec = htab->stub_group[link_sec->id].stub_sec; 3014 if (stub_sec == NULL) 3015 { 3016 size_t namelen; 3017 bfd_size_type len; 3018 char *s_name; 3019 3020 namelen = strlen (link_sec->name); 3021 len = namelen + sizeof (STUB_SUFFIX); 3022 s_name = bfd_alloc (htab->stub_bfd, len); 3023 if (s_name == NULL) 3024 return NULL; 3025 3026 memcpy (s_name, link_sec->name, namelen); 3027 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX)); 3028 stub_sec = (*htab->add_stub_section) (s_name, link_sec); 3029 if (stub_sec == NULL) 3030 return NULL; 3031 htab->stub_group[link_sec->id].stub_sec = stub_sec; 3032 } 3033 htab->stub_group[section->id].stub_sec = stub_sec; 3034 } 3035 3036 /* Enter this entry into the linker stub hash table. */ 3037 stub_entry = arm_stub_hash_lookup (&htab->stub_hash_table, stub_name, 3038 TRUE, FALSE); 3039 if (stub_entry == NULL) 3040 { 3041 (*_bfd_error_handler) (_("%s: cannot create stub entry %s"), 3042 section->owner, 3043 stub_name); 3044 return NULL; 3045 } 3046 3047 stub_entry->stub_sec = stub_sec; 3048 stub_entry->stub_offset = 0; 3049 stub_entry->id_sec = link_sec; 3050 3051 return stub_entry; 3052 } 3053 3054 /* Store an Arm insn into an output section not processed by 3055 elf32_arm_write_section. */ 3056 3057 static void 3058 put_arm_insn (struct elf32_arm_link_hash_table * htab, 3059 bfd * output_bfd, bfd_vma val, void * ptr) 3060 { 3061 if (htab->byteswap_code != bfd_little_endian (output_bfd)) 3062 bfd_putl32 (val, ptr); 3063 else 3064 bfd_putb32 (val, ptr); 3065 } 3066 3067 /* Store a 16-bit Thumb insn into an output section not processed by 3068 elf32_arm_write_section. */ 3069 3070 static void 3071 put_thumb_insn (struct elf32_arm_link_hash_table * htab, 3072 bfd * output_bfd, bfd_vma val, void * ptr) 3073 { 3074 if (htab->byteswap_code != bfd_little_endian (output_bfd)) 3075 bfd_putl16 (val, ptr); 3076 else 3077 bfd_putb16 (val, ptr); 3078 } 3079 3080 static bfd_boolean 3081 arm_build_one_stub (struct bfd_hash_entry *gen_entry, 3082 void * in_arg) 3083 { 3084 struct elf32_arm_stub_hash_entry *stub_entry; 3085 struct bfd_link_info *info; 3086 struct elf32_arm_link_hash_table *htab; 3087 asection *stub_sec; 3088 bfd *stub_bfd; 3089 bfd_vma stub_addr; 3090 bfd_byte *loc; 3091 bfd_vma sym_value; 3092 int template_size; 3093 int size; 3094 const bfd_vma *template; 3095 int i; 3096 struct elf32_arm_link_hash_table * globals; 3097 3098 /* Massage our args to the form they really have. */ 3099 stub_entry = (struct elf32_arm_stub_hash_entry *) gen_entry; 3100 info = (struct bfd_link_info *) in_arg; 3101 3102 globals = elf32_arm_hash_table (info); 3103 3104 htab = elf32_arm_hash_table (info); 3105 stub_sec = stub_entry->stub_sec; 3106 3107 /* Make a note of the offset within the stubs for this entry. */ 3108 stub_entry->stub_offset = stub_sec->size; 3109 loc = stub_sec->contents + stub_entry->stub_offset; 3110 3111 stub_bfd = stub_sec->owner; 3112 3113 /* This is the address of the start of the stub. */ 3114 stub_addr = stub_sec->output_section->vma + stub_sec->output_offset 3115 + stub_entry->stub_offset; 3116 3117 /* This is the address of the stub destination. */ 3118 sym_value = (stub_entry->target_value 3119 + stub_entry->target_section->output_offset 3120 + stub_entry->target_section->output_section->vma); 3121 3122 switch (stub_entry->stub_type) 3123 { 3124 case arm_stub_long_branch: 3125 template = arm_long_branch_stub; 3126 template_size = (sizeof (arm_long_branch_stub) / sizeof (bfd_vma)) * 4; 3127 break; 3128 case arm_thumb_v4t_stub_long_branch: 3129 template = arm_thumb_v4t_long_branch_stub; 3130 template_size = (sizeof (arm_thumb_v4t_long_branch_stub) / sizeof (bfd_vma)) * 4; 3131 break; 3132 case arm_thumb_thumb_stub_long_branch: 3133 template = arm_thumb_thumb_long_branch_stub; 3134 template_size = (sizeof (arm_thumb_thumb_long_branch_stub) / sizeof (bfd_vma)) * 4; 3135 break; 3136 case arm_thumb_arm_v4t_stub_long_branch: 3137 template = arm_thumb_arm_v4t_long_branch_stub; 3138 template_size = (sizeof (arm_thumb_arm_v4t_long_branch_stub) / sizeof (bfd_vma)) * 4; 3139 break; 3140 case arm_thumb_arm_v4t_stub_short_branch: 3141 template = arm_thumb_arm_v4t_short_branch_stub; 3142 template_size = (sizeof(arm_thumb_arm_v4t_short_branch_stub) / sizeof (bfd_vma)) * 4; 3143 break; 3144 case arm_stub_pic_long_branch: 3145 template = arm_pic_long_branch_stub; 3146 template_size = (sizeof (arm_pic_long_branch_stub) / sizeof (bfd_vma)) * 4; 3147 break; 3148 default: 3149 BFD_FAIL (); 3150 return FALSE; 3151 } 3152 3153 size = 0; 3154 for (i = 0; i < (template_size / 4); i++) 3155 { 3156 /* A 0 pattern is a placeholder, every other pattern is an 3157 instruction. */ 3158 if (template[i] != 0) 3159 put_arm_insn (globals, stub_bfd, template[i], loc + size); 3160 else 3161 bfd_put_32 (stub_bfd, template[i], loc + size); 3162 3163 size += 4; 3164 } 3165 stub_sec->size += size; 3166 3167 /* Destination is Thumb. Force bit 0 to 1 to reflect this. */ 3168 if (stub_entry->st_type == STT_ARM_TFUNC) 3169 sym_value |= 1; 3170 3171 switch (stub_entry->stub_type) 3172 { 3173 case arm_stub_long_branch: 3174 _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32), 3175 stub_bfd, stub_sec, stub_sec->contents, 3176 stub_entry->stub_offset + 4, sym_value, 0); 3177 break; 3178 case arm_thumb_v4t_stub_long_branch: 3179 _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32), 3180 stub_bfd, stub_sec, stub_sec->contents, 3181 stub_entry->stub_offset + 8, sym_value, 0); 3182 break; 3183 case arm_thumb_thumb_stub_long_branch: 3184 _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32), 3185 stub_bfd, stub_sec, stub_sec->contents, 3186 stub_entry->stub_offset + 12, sym_value, 0); 3187 break; 3188 case arm_thumb_arm_v4t_stub_long_branch: 3189 _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32), 3190 stub_bfd, stub_sec, stub_sec->contents, 3191 stub_entry->stub_offset + 16, sym_value, 0); 3192 break; 3193 case arm_thumb_arm_v4t_stub_short_branch: 3194 { 3195 long int rel_offset; 3196 static const insn32 t2a3_b_insn = 0xea000000; 3197 3198 rel_offset = sym_value - (stub_addr + 8 + 4); 3199 3200 put_arm_insn (globals, stub_bfd, 3201 (bfd_vma) t2a3_b_insn | ((rel_offset >> 2) & 0x00FFFFFF), 3202 loc + 4); 3203 } 3204 break; 3205 3206 case arm_stub_pic_long_branch: 3207 /* We want the value relative to the address 8 bytes from the 3208 start of the stub. */ 3209 _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_REL32), 3210 stub_bfd, stub_sec, stub_sec->contents, 3211 stub_entry->stub_offset + 8, sym_value, 0); 3212 break; 3213 default: 3214 break; 3215 } 3216 3217 return TRUE; 3218 } 3219 3220 /* As above, but don't actually build the stub. Just bump offset so 3221 we know stub section sizes. */ 3222 3223 static bfd_boolean 3224 arm_size_one_stub (struct bfd_hash_entry *gen_entry, 3225 void * in_arg) 3226 { 3227 struct elf32_arm_stub_hash_entry *stub_entry; 3228 struct elf32_arm_link_hash_table *htab; 3229 const bfd_vma *template; 3230 int template_size; 3231 int size; 3232 int i; 3233 3234 /* Massage our args to the form they really have. */ 3235 stub_entry = (struct elf32_arm_stub_hash_entry *) gen_entry; 3236 htab = (struct elf32_arm_link_hash_table *) in_arg; 3237 3238 switch (stub_entry->stub_type) 3239 { 3240 case arm_stub_long_branch: 3241 template = arm_long_branch_stub; 3242 template_size = (sizeof (arm_long_branch_stub) / sizeof (bfd_vma)) * 4; 3243 break; 3244 case arm_thumb_v4t_stub_long_branch: 3245 template = arm_thumb_v4t_long_branch_stub; 3246 template_size = (sizeof (arm_thumb_v4t_long_branch_stub) / sizeof (bfd_vma)) * 4; 3247 break; 3248 case arm_thumb_thumb_stub_long_branch: 3249 template = arm_thumb_thumb_long_branch_stub; 3250 template_size = (sizeof (arm_thumb_thumb_long_branch_stub) / sizeof (bfd_vma)) * 4; 3251 break; 3252 case arm_thumb_arm_v4t_stub_long_branch: 3253 template = arm_thumb_arm_v4t_long_branch_stub; 3254 template_size = (sizeof (arm_thumb_arm_v4t_long_branch_stub) / sizeof (bfd_vma)) * 4; 3255 break; 3256 case arm_thumb_arm_v4t_stub_short_branch: 3257 template = arm_thumb_arm_v4t_short_branch_stub; 3258 template_size = (sizeof(arm_thumb_arm_v4t_short_branch_stub) / sizeof (bfd_vma)) * 4; 3259 break; 3260 case arm_stub_pic_long_branch: 3261 template = arm_pic_long_branch_stub; 3262 template_size = (sizeof (arm_pic_long_branch_stub) / sizeof (bfd_vma)) * 4; 3263 break; 3264 default: 3265 BFD_FAIL (); 3266 return FALSE; 3267 break; 3268 } 3269 3270 size = 0; 3271 for (i = 0; i < (template_size / 4); i++) 3272 size += 4; 3273 size = (size + 7) & ~7; 3274 stub_entry->stub_sec->size += size; 3275 return TRUE; 3276 } 3277 3278 /* External entry points for sizing and building linker stubs. */ 3279 3280 /* Set up various things so that we can make a list of input sections 3281 for each output section included in the link. Returns -1 on error, 3282 0 when no stubs will be needed, and 1 on success. */ 3283 3284 int 3285 elf32_arm_setup_section_lists (bfd *output_bfd, 3286 struct bfd_link_info *info) 3287 { 3288 bfd *input_bfd; 3289 unsigned int bfd_count; 3290 int top_id, top_index; 3291 asection *section; 3292 asection **input_list, **list; 3293 bfd_size_type amt; 3294 struct elf32_arm_link_hash_table *htab = elf32_arm_hash_table (info); 3295 3296 if (! is_elf_hash_table (htab)) 3297 return 0; 3298 3299 /* Count the number of input BFDs and find the top input section id. */ 3300 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; 3301 input_bfd != NULL; 3302 input_bfd = input_bfd->link_next) 3303 { 3304 bfd_count += 1; 3305 for (section = input_bfd->sections; 3306 section != NULL; 3307 section = section->next) 3308 { 3309 if (top_id < section->id) 3310 top_id = section->id; 3311 } 3312 } 3313 htab->bfd_count = bfd_count; 3314 3315 amt = sizeof (struct map_stub) * (top_id + 1); 3316 htab->stub_group = bfd_zmalloc (amt); 3317 if (htab->stub_group == NULL) 3318 return -1; 3319 3320 /* We can't use output_bfd->section_count here to find the top output 3321 section index as some sections may have been removed, and 3322 _bfd_strip_section_from_output doesn't renumber the indices. */ 3323 for (section = output_bfd->sections, top_index = 0; 3324 section != NULL; 3325 section = section->next) 3326 { 3327 if (top_index < section->index) 3328 top_index = section->index; 3329 } 3330 3331 htab->top_index = top_index; 3332 amt = sizeof (asection *) * (top_index + 1); 3333 input_list = bfd_malloc (amt); 3334 htab->input_list = input_list; 3335 if (input_list == NULL) 3336 return -1; 3337 3338 /* For sections we aren't interested in, mark their entries with a 3339 value we can check later. */ 3340 list = input_list + top_index; 3341 do 3342 *list = bfd_abs_section_ptr; 3343 while (list-- != input_list); 3344 3345 for (section = output_bfd->sections; 3346 section != NULL; 3347 section = section->next) 3348 { 3349 if ((section->flags & SEC_CODE) != 0) 3350 input_list[section->index] = NULL; 3351 } 3352 3353 return 1; 3354 } 3355 3356 /* The linker repeatedly calls this function for each input section, 3357 in the order that input sections are linked into output sections. 3358 Build lists of input sections to determine groupings between which 3359 we may insert linker stubs. */ 3360 3361 void 3362 elf32_arm_next_input_section (struct bfd_link_info *info, 3363 asection *isec) 3364 { 3365 struct elf32_arm_link_hash_table *htab = elf32_arm_hash_table (info); 3366 3367 if (isec->output_section->index <= htab->top_index) 3368 { 3369 asection **list = htab->input_list + isec->output_section->index; 3370 3371 if (*list != bfd_abs_section_ptr) 3372 { 3373 /* Steal the link_sec pointer for our list. */ 3374 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) 3375 /* This happens to make the list in reverse order, 3376 which is what we want. */ 3377 PREV_SEC (isec) = *list; 3378 *list = isec; 3379 } 3380 } 3381 } 3382 3383 /* See whether we can group stub sections together. Grouping stub 3384 sections may result in fewer stubs. More importantly, we need to 3385 put all .init* and .fini* stubs at the beginning of the .init or 3386 .fini output sections respectively, because glibc splits the 3387 _init and _fini functions into multiple parts. Putting a stub in 3388 the middle of a function is not a good idea. */ 3389 3390 static void 3391 group_sections (struct elf32_arm_link_hash_table *htab, 3392 bfd_size_type stub_group_size, 3393 bfd_boolean stubs_always_before_branch) 3394 { 3395 asection **list = htab->input_list + htab->top_index; 3396 3397 do 3398 { 3399 asection *tail = *list; 3400 3401 if (tail == bfd_abs_section_ptr) 3402 continue; 3403 3404 while (tail != NULL) 3405 { 3406 asection *curr; 3407 asection *prev; 3408 bfd_size_type total; 3409 3410 curr = tail; 3411 total = tail->size; 3412 while ((prev = PREV_SEC (curr)) != NULL 3413 && ((total += curr->output_offset - prev->output_offset) 3414 < stub_group_size)) 3415 curr = prev; 3416 3417 /* OK, the size from the start of CURR to the end is less 3418 than stub_group_size and thus can be handled by one stub 3419 section. (Or the tail section is itself larger than 3420 stub_group_size, in which case we may be toast.) 3421 We should really be keeping track of the total size of 3422 stubs added here, as stubs contribute to the final output 3423 section size. */ 3424 do 3425 { 3426 prev = PREV_SEC (tail); 3427 /* Set up this stub group. */ 3428 htab->stub_group[tail->id].link_sec = curr; 3429 } 3430 while (tail != curr && (tail = prev) != NULL); 3431 3432 /* But wait, there's more! Input sections up to stub_group_size 3433 bytes before the stub section can be handled by it too. */ 3434 if (!stubs_always_before_branch) 3435 { 3436 total = 0; 3437 while (prev != NULL 3438 && ((total += tail->output_offset - prev->output_offset) 3439 < stub_group_size)) 3440 { 3441 tail = prev; 3442 prev = PREV_SEC (tail); 3443 htab->stub_group[tail->id].link_sec = curr; 3444 } 3445 } 3446 tail = prev; 3447 } 3448 } 3449 while (list-- != htab->input_list); 3450 3451 free (htab->input_list); 3452 #undef PREV_SEC 3453 } 3454 3455 /* Determine and set the size of the stub section for a final link. 3456 3457 The basic idea here is to examine all the relocations looking for 3458 PC-relative calls to a target that is unreachable with a "bl" 3459 instruction. */ 3460 3461 bfd_boolean 3462 elf32_arm_size_stubs (bfd *output_bfd, 3463 bfd *stub_bfd, 3464 struct bfd_link_info *info, 3465 bfd_signed_vma group_size, 3466 asection * (*add_stub_section) (const char *, asection *), 3467 void (*layout_sections_again) (void)) 3468 { 3469 bfd_size_type stub_group_size; 3470 bfd_boolean stubs_always_before_branch; 3471 bfd_boolean stub_changed = 0; 3472 struct elf32_arm_link_hash_table *htab = elf32_arm_hash_table (info); 3473 3474 /* Propagate mach to stub bfd, because it may not have been 3475 finalized when we created stub_bfd. */ 3476 bfd_set_arch_mach (stub_bfd, bfd_get_arch (output_bfd), 3477 bfd_get_mach (output_bfd)); 3478 3479 /* Stash our params away. */ 3480 htab->stub_bfd = stub_bfd; 3481 htab->add_stub_section = add_stub_section; 3482 htab->layout_sections_again = layout_sections_again; 3483 stubs_always_before_branch = group_size < 0; 3484 if (group_size < 0) 3485 stub_group_size = -group_size; 3486 else 3487 stub_group_size = group_size; 3488 3489 if (stub_group_size == 1) 3490 { 3491 /* Default values. */ 3492 /* Thumb branch range is +-4MB has to be used as the default 3493 maximum size (a given section can contain both ARM and Thumb 3494 code, so the worst case has to be taken into account). 3495 3496 This value is 24K less than that, which allows for 2025 3497 12-byte stubs. If we exceed that, then we will fail to link. 3498 The user will have to relink with an explicit group size 3499 option. */ 3500 stub_group_size = 4170000; 3501 } 3502 3503 group_sections (htab, stub_group_size, stubs_always_before_branch); 3504 3505 while (1) 3506 { 3507 bfd *input_bfd; 3508 unsigned int bfd_indx; 3509 asection *stub_sec; 3510 3511 for (input_bfd = info->input_bfds, bfd_indx = 0; 3512 input_bfd != NULL; 3513 input_bfd = input_bfd->link_next, bfd_indx++) 3514 { 3515 Elf_Internal_Shdr *symtab_hdr; 3516 asection *section; 3517 Elf_Internal_Sym *local_syms = NULL; 3518 3519 /* We'll need the symbol table in a second. */ 3520 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3521 if (symtab_hdr->sh_info == 0) 3522 continue; 3523 3524 /* Walk over each section attached to the input bfd. */ 3525 for (section = input_bfd->sections; 3526 section != NULL; 3527 section = section->next) 3528 { 3529 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 3530 3531 /* If there aren't any relocs, then there's nothing more 3532 to do. */ 3533 if ((section->flags & SEC_RELOC) == 0 3534 || section->reloc_count == 0 3535 || (section->flags & SEC_CODE) == 0) 3536 continue; 3537 3538 /* If this section is a link-once section that will be 3539 discarded, then don't create any stubs. */ 3540 if (section->output_section == NULL 3541 || section->output_section->owner != output_bfd) 3542 continue; 3543 3544 /* Get the relocs. */ 3545 internal_relocs 3546 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, 3547 NULL, info->keep_memory); 3548 if (internal_relocs == NULL) 3549 goto error_ret_free_local; 3550 3551 /* Now examine each relocation. */ 3552 irela = internal_relocs; 3553 irelaend = irela + section->reloc_count; 3554 for (; irela < irelaend; irela++) 3555 { 3556 unsigned int r_type, r_indx; 3557 enum elf32_arm_stub_type stub_type; 3558 struct elf32_arm_stub_hash_entry *stub_entry; 3559 asection *sym_sec; 3560 bfd_vma sym_value; 3561 bfd_vma destination; 3562 struct elf32_arm_link_hash_entry *hash; 3563 const char *sym_name; 3564 char *stub_name; 3565 const asection *id_sec; 3566 unsigned char st_type; 3567 3568 r_type = ELF32_R_TYPE (irela->r_info); 3569 r_indx = ELF32_R_SYM (irela->r_info); 3570 3571 if (r_type >= (unsigned int) R_ARM_max) 3572 { 3573 bfd_set_error (bfd_error_bad_value); 3574 error_ret_free_internal: 3575 if (elf_section_data (section)->relocs == NULL) 3576 free (internal_relocs); 3577 goto error_ret_free_local; 3578 } 3579 3580 /* Only look for stubs on call instructions. */ 3581 if ((r_type != (unsigned int) R_ARM_CALL) 3582 && (r_type != (unsigned int) R_ARM_THM_CALL)) 3583 continue; 3584 3585 /* Now determine the call target, its name, value, 3586 section. */ 3587 sym_sec = NULL; 3588 sym_value = 0; 3589 destination = 0; 3590 hash = NULL; 3591 sym_name = NULL; 3592 if (r_indx < symtab_hdr->sh_info) 3593 { 3594 /* It's a local symbol. */ 3595 Elf_Internal_Sym *sym; 3596 Elf_Internal_Shdr *hdr; 3597 3598 if (local_syms == NULL) 3599 { 3600 local_syms 3601 = (Elf_Internal_Sym *) symtab_hdr->contents; 3602 if (local_syms == NULL) 3603 local_syms 3604 = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 3605 symtab_hdr->sh_info, 0, 3606 NULL, NULL, NULL); 3607 if (local_syms == NULL) 3608 goto error_ret_free_internal; 3609 } 3610 3611 sym = local_syms + r_indx; 3612 hdr = elf_elfsections (input_bfd)[sym->st_shndx]; 3613 sym_sec = hdr->bfd_section; 3614 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) 3615 sym_value = sym->st_value; 3616 destination = (sym_value + irela->r_addend 3617 + sym_sec->output_offset 3618 + sym_sec->output_section->vma); 3619 st_type = ELF_ST_TYPE (sym->st_info); 3620 sym_name 3621 = bfd_elf_string_from_elf_section (input_bfd, 3622 symtab_hdr->sh_link, 3623 sym->st_name); 3624 } 3625 else 3626 { 3627 /* It's an external symbol. */ 3628 int e_indx; 3629 3630 e_indx = r_indx - symtab_hdr->sh_info; 3631 hash = ((struct elf32_arm_link_hash_entry *) 3632 elf_sym_hashes (input_bfd)[e_indx]); 3633 3634 while (hash->root.root.type == bfd_link_hash_indirect 3635 || hash->root.root.type == bfd_link_hash_warning) 3636 hash = ((struct elf32_arm_link_hash_entry *) 3637 hash->root.root.u.i.link); 3638 3639 if (hash->root.root.type == bfd_link_hash_defined 3640 || hash->root.root.type == bfd_link_hash_defweak) 3641 { 3642 sym_sec = hash->root.root.u.def.section; 3643 sym_value = hash->root.root.u.def.value; 3644 if (sym_sec->output_section != NULL) 3645 destination = (sym_value + irela->r_addend 3646 + sym_sec->output_offset 3647 + sym_sec->output_section->vma); 3648 } 3649 else if (hash->root.root.type == bfd_link_hash_undefweak 3650 || hash->root.root.type == bfd_link_hash_undefined) 3651 /* For a shared library, these will need a PLT stub, 3652 which is treated separately. 3653 For absolute code, they cannot be handled. */ 3654 continue; 3655 else 3656 { 3657 bfd_set_error (bfd_error_bad_value); 3658 goto error_ret_free_internal; 3659 } 3660 st_type = ELF_ST_TYPE (hash->root.type); 3661 sym_name = hash->root.root.root.string; 3662 } 3663 3664 /* Determine what (if any) linker stub is needed. */ 3665 stub_type = arm_type_of_stub (info, section, irela, st_type, 3666 hash, destination, sym_sec, 3667 input_bfd, sym_name); 3668 if (stub_type == arm_stub_none) 3669 continue; 3670 3671 /* Support for grouping stub sections. */ 3672 id_sec = htab->stub_group[section->id].link_sec; 3673 3674 /* Get the name of this stub. */ 3675 stub_name = elf32_arm_stub_name (id_sec, sym_sec, hash, irela); 3676 if (!stub_name) 3677 goto error_ret_free_internal; 3678 3679 stub_entry = arm_stub_hash_lookup (&htab->stub_hash_table, 3680 stub_name, 3681 FALSE, FALSE); 3682 if (stub_entry != NULL) 3683 { 3684 /* The proper stub has already been created. */ 3685 free (stub_name); 3686 continue; 3687 } 3688 3689 stub_entry = elf32_arm_add_stub (stub_name, section, htab); 3690 if (stub_entry == NULL) 3691 { 3692 free (stub_name); 3693 goto error_ret_free_internal; 3694 } 3695 3696 stub_entry->target_value = sym_value; 3697 stub_entry->target_section = sym_sec; 3698 stub_entry->stub_type = stub_type; 3699 stub_entry->h = hash; 3700 stub_entry->st_type = st_type; 3701 3702 if (sym_name == NULL) 3703 sym_name = "unnamed"; 3704 stub_entry->output_name 3705 = bfd_alloc (htab->stub_bfd, 3706 sizeof (THUMB2ARM_GLUE_ENTRY_NAME) 3707 + strlen (sym_name)); 3708 if (stub_entry->output_name == NULL) 3709 { 3710 free (stub_name); 3711 goto error_ret_free_internal; 3712 } 3713 3714 /* For historical reasons, use the existing names for 3715 ARM-to-Thumb and Thumb-to-ARM stubs. */ 3716 if (r_type == (unsigned int) R_ARM_THM_CALL 3717 && st_type != STT_ARM_TFUNC) 3718 sprintf (stub_entry->output_name, THUMB2ARM_GLUE_ENTRY_NAME, 3719 sym_name); 3720 else if (r_type == (unsigned int) R_ARM_CALL 3721 && st_type == STT_ARM_TFUNC) 3722 sprintf (stub_entry->output_name, ARM2THUMB_GLUE_ENTRY_NAME, 3723 sym_name); 3724 else 3725 sprintf (stub_entry->output_name, STUB_ENTRY_NAME, 3726 sym_name); 3727 3728 stub_changed = TRUE; 3729 } 3730 3731 /* We're done with the internal relocs, free them. */ 3732 if (elf_section_data (section)->relocs == NULL) 3733 free (internal_relocs); 3734 } 3735 } 3736 3737 if (!stub_changed) 3738 break; 3739 3740 /* OK, we've added some stubs. Find out the new size of the 3741 stub sections. */ 3742 for (stub_sec = htab->stub_bfd->sections; 3743 stub_sec != NULL; 3744 stub_sec = stub_sec->next) 3745 stub_sec->size = 0; 3746 3747 bfd_hash_traverse (&htab->stub_hash_table, arm_size_one_stub, htab); 3748 3749 /* Ask the linker to do its stuff. */ 3750 (*htab->layout_sections_again) (); 3751 stub_changed = FALSE; 3752 } 3753 3754 return TRUE; 3755 3756 error_ret_free_local: 3757 return FALSE; 3758 } 3759 3760 /* Build all the stubs associated with the current output file. The 3761 stubs are kept in a hash table attached to the main linker hash 3762 table. We also set up the .plt entries for statically linked PIC 3763 functions here. This function is called via arm_elf_finish in the 3764 linker. */ 3765 3766 bfd_boolean 3767 elf32_arm_build_stubs (struct bfd_link_info *info) 3768 { 3769 asection *stub_sec; 3770 struct bfd_hash_table *table; 3771 struct elf32_arm_link_hash_table *htab; 3772 3773 htab = elf32_arm_hash_table (info); 3774 3775 for (stub_sec = htab->stub_bfd->sections; 3776 stub_sec != NULL; 3777 stub_sec = stub_sec->next) 3778 { 3779 bfd_size_type size; 3780 3781 /* Ignore non-stub sections. */ 3782 if (!strstr (stub_sec->name, STUB_SUFFIX)) 3783 continue; 3784 3785 /* Allocate memory to hold the linker stubs. */ 3786 size = stub_sec->size; 3787 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); 3788 if (stub_sec->contents == NULL && size != 0) 3789 return FALSE; 3790 stub_sec->size = 0; 3791 } 3792 3793 /* Build the stubs as directed by the stub hash table. */ 3794 table = &htab->stub_hash_table; 3795 bfd_hash_traverse (table, arm_build_one_stub, info); 3796 3797 return TRUE; 3798 } 3799 3800 /* Locate the Thumb encoded calling stub for NAME. */ 3801 3802 static struct elf_link_hash_entry * 3803 find_thumb_glue (struct bfd_link_info *link_info, 3804 const char *name, 3805 char **error_message) 3806 { 3807 char *tmp_name; 3808 struct elf_link_hash_entry *hash; 3809 struct elf32_arm_link_hash_table *hash_table; 3810 3811 /* We need a pointer to the armelf specific hash table. */ 3812 hash_table = elf32_arm_hash_table (link_info); 3813 3814 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 3815 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); 3816 3817 BFD_ASSERT (tmp_name); 3818 3819 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); 3820 3821 hash = elf_link_hash_lookup 3822 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); 3823 3824 if (hash == NULL 3825 && asprintf (error_message, _("unable to find THUMB glue '%s' for '%s'"), 3826 tmp_name, name) == -1) 3827 *error_message = (char *) bfd_errmsg (bfd_error_system_call); 3828 3829 free (tmp_name); 3830 3831 return hash; 3832 } 3833 3834 /* Locate the ARM encoded calling stub for NAME. */ 3835 3836 static struct elf_link_hash_entry * 3837 find_arm_glue (struct bfd_link_info *link_info, 3838 const char *name, 3839 char **error_message) 3840 { 3841 char *tmp_name; 3842 struct elf_link_hash_entry *myh; 3843 struct elf32_arm_link_hash_table *hash_table; 3844 3845 /* We need a pointer to the elfarm specific hash table. */ 3846 hash_table = elf32_arm_hash_table (link_info); 3847 3848 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 3849 + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); 3850 3851 BFD_ASSERT (tmp_name); 3852 3853 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); 3854 3855 myh = elf_link_hash_lookup 3856 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); 3857 3858 if (myh == NULL 3859 && asprintf (error_message, _("unable to find ARM glue '%s' for '%s'"), 3860 tmp_name, name) == -1) 3861 *error_message = (char *) bfd_errmsg (bfd_error_system_call); 3862 3863 free (tmp_name); 3864 3865 return myh; 3866 } 3867 3868 /* ARM->Thumb glue (static images): 3869 3870 .arm 3871 __func_from_arm: 3872 ldr r12, __func_addr 3873 bx r12 3874 __func_addr: 3875 .word func @ behave as if you saw a ARM_32 reloc. 3876 3877 (v5t static images) 3878 .arm 3879 __func_from_arm: 3880 ldr pc, __func_addr 3881 __func_addr: 3882 .word func @ behave as if you saw a ARM_32 reloc. 3883 3884 (relocatable images) 3885 .arm 3886 __func_from_arm: 3887 ldr r12, __func_offset 3888 add r12, r12, pc 3889 bx r12 3890 __func_offset: 3891 .word func - . */ 3892 3893 #define ARM2THUMB_STATIC_GLUE_SIZE 12 3894 static const insn32 a2t1_ldr_insn = 0xe59fc000; 3895 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; 3896 static const insn32 a2t3_func_addr_insn = 0x00000001; 3897 3898 #define ARM2THUMB_V5_STATIC_GLUE_SIZE 8 3899 static const insn32 a2t1v5_ldr_insn = 0xe51ff004; 3900 static const insn32 a2t2v5_func_addr_insn = 0x00000001; 3901 3902 #define ARM2THUMB_PIC_GLUE_SIZE 16 3903 static const insn32 a2t1p_ldr_insn = 0xe59fc004; 3904 static const insn32 a2t2p_add_pc_insn = 0xe08cc00f; 3905 static const insn32 a2t3p_bx_r12_insn = 0xe12fff1c; 3906 3907 /* Thumb->ARM: Thumb->(non-interworking aware) ARM 3908 3909 .thumb .thumb 3910 .align 2 .align 2 3911 __func_from_thumb: __func_from_thumb: 3912 bx pc push {r6, lr} 3913 nop ldr r6, __func_addr 3914 .arm mov lr, pc 3915 b func bx r6 3916 .arm 3917 ;; back_to_thumb 3918 ldmia r13! {r6, lr} 3919 bx lr 3920 __func_addr: 3921 .word func */ 3922 3923 #define THUMB2ARM_GLUE_SIZE 8 3924 static const insn16 t2a1_bx_pc_insn = 0x4778; 3925 static const insn16 t2a2_noop_insn = 0x46c0; 3926 static const insn32 t2a3_b_insn = 0xea000000; 3927 3928 #define VFP11_ERRATUM_VENEER_SIZE 8 3929 3930 #define ARM_BX_VENEER_SIZE 12 3931 static const insn32 armbx1_tst_insn = 0xe3100001; 3932 static const insn32 armbx2_moveq_insn = 0x01a0f000; 3933 static const insn32 armbx3_bx_insn = 0xe12fff10; 3934 3935 #ifndef ELFARM_NABI_C_INCLUDED 3936 static void 3937 arm_allocate_glue_section_space (bfd * abfd, bfd_size_type size, const char * name) 3938 { 3939 asection * s; 3940 bfd_byte * contents; 3941 3942 if (size == 0) 3943 return; 3944 3945 BFD_ASSERT (abfd != NULL); 3946 3947 s = bfd_get_section_by_name (abfd, name); 3948 BFD_ASSERT (s != NULL); 3949 3950 contents = bfd_alloc (abfd, size); 3951 3952 BFD_ASSERT (s->size == size); 3953 s->contents = contents; 3954 } 3955 3956 bfd_boolean 3957 bfd_elf32_arm_allocate_interworking_sections (struct bfd_link_info * info) 3958 { 3959 struct elf32_arm_link_hash_table * globals; 3960 3961 globals = elf32_arm_hash_table (info); 3962 BFD_ASSERT (globals != NULL); 3963 3964 arm_allocate_glue_section_space (globals->bfd_of_glue_owner, 3965 globals->arm_glue_size, 3966 ARM2THUMB_GLUE_SECTION_NAME); 3967 3968 arm_allocate_glue_section_space (globals->bfd_of_glue_owner, 3969 globals->thumb_glue_size, 3970 THUMB2ARM_GLUE_SECTION_NAME); 3971 3972 arm_allocate_glue_section_space (globals->bfd_of_glue_owner, 3973 globals->vfp11_erratum_glue_size, 3974 VFP11_ERRATUM_VENEER_SECTION_NAME); 3975 3976 arm_allocate_glue_section_space (globals->bfd_of_glue_owner, 3977 globals->bx_glue_size, 3978 ARM_BX_GLUE_SECTION_NAME); 3979 3980 return TRUE; 3981 } 3982 3983 /* Allocate space and symbols for calling a Thumb function from Arm mode. 3984 returns the symbol identifying the stub. */ 3985 3986 static struct elf_link_hash_entry * 3987 record_arm_to_thumb_glue (struct bfd_link_info * link_info, 3988 struct elf_link_hash_entry * h) 3989 { 3990 const char * name = h->root.root.string; 3991 asection * s; 3992 char * tmp_name; 3993 struct elf_link_hash_entry * myh; 3994 struct bfd_link_hash_entry * bh; 3995 struct elf32_arm_link_hash_table * globals; 3996 bfd_vma val; 3997 bfd_size_type size; 3998 3999 globals = elf32_arm_hash_table (link_info); 4000 4001 BFD_ASSERT (globals != NULL); 4002 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 4003 4004 s = bfd_get_section_by_name 4005 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); 4006 4007 BFD_ASSERT (s != NULL); 4008 4009 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); 4010 4011 BFD_ASSERT (tmp_name); 4012 4013 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); 4014 4015 myh = elf_link_hash_lookup 4016 (&(globals)->root, tmp_name, FALSE, FALSE, TRUE); 4017 4018 if (myh != NULL) 4019 { 4020 /* We've already seen this guy. */ 4021 free (tmp_name); 4022 return myh; 4023 } 4024 4025 /* The only trick here is using hash_table->arm_glue_size as the value. 4026 Even though the section isn't allocated yet, this is where we will be 4027 putting it. The +1 on the value marks that the stub has not been 4028 output yet - not that it is a Thumb function. */ 4029 bh = NULL; 4030 val = globals->arm_glue_size + 1; 4031 _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, 4032 tmp_name, BSF_GLOBAL, s, val, 4033 NULL, TRUE, FALSE, &bh); 4034 4035 myh = (struct elf_link_hash_entry *) bh; 4036 myh->type = ELF_ST_INFO (STB_LOCAL, STT_FUNC); 4037 myh->forced_local = 1; 4038 4039 free (tmp_name); 4040 4041 if (link_info->shared || globals->root.is_relocatable_executable 4042 || globals->pic_veneer) 4043 size = ARM2THUMB_PIC_GLUE_SIZE; 4044 else if (globals->use_blx) 4045 size = ARM2THUMB_V5_STATIC_GLUE_SIZE; 4046 else 4047 size = ARM2THUMB_STATIC_GLUE_SIZE; 4048 4049 s->size += size; 4050 globals->arm_glue_size += size; 4051 4052 return myh; 4053 } 4054 4055 static void 4056 record_thumb_to_arm_glue (struct bfd_link_info *link_info, 4057 struct elf_link_hash_entry *h) 4058 { 4059 const char *name = h->root.root.string; 4060 asection *s; 4061 char *tmp_name; 4062 struct elf_link_hash_entry *myh; 4063 struct bfd_link_hash_entry *bh; 4064 struct elf32_arm_link_hash_table *hash_table; 4065 bfd_vma val; 4066 4067 hash_table = elf32_arm_hash_table (link_info); 4068 4069 BFD_ASSERT (hash_table != NULL); 4070 BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); 4071 4072 s = bfd_get_section_by_name 4073 (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); 4074 4075 BFD_ASSERT (s != NULL); 4076 4077 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 4078 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); 4079 4080 BFD_ASSERT (tmp_name); 4081 4082 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); 4083 4084 myh = elf_link_hash_lookup 4085 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); 4086 4087 if (myh != NULL) 4088 { 4089 /* We've already seen this guy. */ 4090 free (tmp_name); 4091 return; 4092 } 4093 4094 /* The only trick here is using hash_table->thumb_glue_size as the value. 4095 Even though the section isn't allocated yet, this is where we will be 4096 putting it. The +1 on the value marks that the stub has not been 4097 output yet - not that it is a Thumb function. */ 4098 bh = NULL; 4099 val = hash_table->thumb_glue_size + 1; 4100 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, 4101 tmp_name, BSF_GLOBAL, s, val, 4102 NULL, TRUE, FALSE, &bh); 4103 4104 /* If we mark it 'Thumb', the disassembler will do a better job. */ 4105 myh = (struct elf_link_hash_entry *) bh; 4106 myh->type = ELF_ST_INFO (STB_LOCAL, STT_ARM_TFUNC); 4107 myh->forced_local = 1; 4108 4109 free (tmp_name); 4110 4111 #define CHANGE_TO_ARM "__%s_change_to_arm" 4112 #define BACK_FROM_ARM "__%s_back_from_arm" 4113 4114 /* Allocate another symbol to mark where we switch to Arm mode. */ 4115 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 4116 + strlen (CHANGE_TO_ARM) + 1); 4117 4118 BFD_ASSERT (tmp_name); 4119 4120 sprintf (tmp_name, CHANGE_TO_ARM, name); 4121 4122 bh = NULL; 4123 val = hash_table->thumb_glue_size + 4, 4124 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, 4125 tmp_name, BSF_LOCAL, s, val, 4126 NULL, TRUE, FALSE, &bh); 4127 4128 free (tmp_name); 4129 4130 s->size += THUMB2ARM_GLUE_SIZE; 4131 hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; 4132 } 4133 4134 4135 /* Allocate space for ARMv4 BX veneers. */ 4136 4137 static void 4138 record_arm_bx_glue (struct bfd_link_info * link_info, int reg) 4139 { 4140 asection * s; 4141 struct elf32_arm_link_hash_table *globals; 4142 char *tmp_name; 4143 struct elf_link_hash_entry *myh; 4144 struct bfd_link_hash_entry *bh; 4145 bfd_vma val; 4146 4147 /* BX PC does not need a veneer. */ 4148 if (reg == 15) 4149 return; 4150 4151 globals = elf32_arm_hash_table (link_info); 4152 4153 BFD_ASSERT (globals != NULL); 4154 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 4155 4156 /* Check if this veneer has already been allocated. */ 4157 if (globals->bx_glue_offset[reg]) 4158 return; 4159 4160 s = bfd_get_section_by_name 4161 (globals->bfd_of_glue_owner, ARM_BX_GLUE_SECTION_NAME); 4162 4163 BFD_ASSERT (s != NULL); 4164 4165 /* Add symbol for veneer. */ 4166 tmp_name = bfd_malloc ((bfd_size_type) strlen (ARM_BX_GLUE_ENTRY_NAME) + 1); 4167 4168 BFD_ASSERT (tmp_name); 4169 4170 sprintf (tmp_name, ARM_BX_GLUE_ENTRY_NAME, reg); 4171 4172 myh = elf_link_hash_lookup 4173 (&(globals)->root, tmp_name, FALSE, FALSE, FALSE); 4174 4175 BFD_ASSERT (myh == NULL); 4176 4177 bh = NULL; 4178 val = globals->bx_glue_size; 4179 _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, 4180 tmp_name, BSF_FUNCTION | BSF_LOCAL, s, val, 4181 NULL, TRUE, FALSE, &bh); 4182 4183 myh = (struct elf_link_hash_entry *) bh; 4184 myh->type = ELF_ST_INFO (STB_LOCAL, STT_FUNC); 4185 myh->forced_local = 1; 4186 4187 s->size += ARM_BX_VENEER_SIZE; 4188 globals->bx_glue_offset[reg] = globals->bx_glue_size | 2; 4189 globals->bx_glue_size += ARM_BX_VENEER_SIZE; 4190 } 4191 4192 4193 /* Add an entry to the code/data map for section SEC. */ 4194 4195 static void 4196 elf32_arm_section_map_add (asection *sec, char type, bfd_vma vma) 4197 { 4198 struct _arm_elf_section_data *sec_data = elf32_arm_section_data (sec); 4199 unsigned int newidx; 4200 4201 if (sec_data->map == NULL) 4202 { 4203 sec_data->map = bfd_malloc (sizeof (elf32_arm_section_map)); 4204 sec_data->mapcount = 0; 4205 sec_data->mapsize = 1; 4206 } 4207 4208 newidx = sec_data->mapcount++; 4209 4210 if (sec_data->mapcount > sec_data->mapsize) 4211 { 4212 sec_data->mapsize *= 2; 4213 sec_data->map = bfd_realloc_or_free (sec_data->map, sec_data->mapsize 4214 * sizeof (elf32_arm_section_map)); 4215 } 4216 4217 if (sec_data->map) 4218 { 4219 sec_data->map[newidx].vma = vma; 4220 sec_data->map[newidx].type = type; 4221 } 4222 } 4223 4224 4225 /* Record information about a VFP11 denorm-erratum veneer. Only ARM-mode 4226 veneers are handled for now. */ 4227 4228 static bfd_vma 4229 record_vfp11_erratum_veneer (struct bfd_link_info *link_info, 4230 elf32_vfp11_erratum_list *branch, 4231 bfd *branch_bfd, 4232 asection *branch_sec, 4233 unsigned int offset) 4234 { 4235 asection *s; 4236 struct elf32_arm_link_hash_table *hash_table; 4237 char *tmp_name; 4238 struct elf_link_hash_entry *myh; 4239 struct bfd_link_hash_entry *bh; 4240 bfd_vma val; 4241 struct _arm_elf_section_data *sec_data; 4242 int errcount; 4243 elf32_vfp11_erratum_list *newerr; 4244 4245 hash_table = elf32_arm_hash_table (link_info); 4246 4247 BFD_ASSERT (hash_table != NULL); 4248 BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); 4249 4250 s = bfd_get_section_by_name 4251 (hash_table->bfd_of_glue_owner, VFP11_ERRATUM_VENEER_SECTION_NAME); 4252 4253 sec_data = elf32_arm_section_data (s); 4254 4255 BFD_ASSERT (s != NULL); 4256 4257 tmp_name = bfd_malloc ((bfd_size_type) strlen 4258 (VFP11_ERRATUM_VENEER_ENTRY_NAME) + 10); 4259 4260 BFD_ASSERT (tmp_name); 4261 4262 sprintf (tmp_name, VFP11_ERRATUM_VENEER_ENTRY_NAME, 4263 hash_table->num_vfp11_fixes); 4264 4265 myh = elf_link_hash_lookup 4266 (&(hash_table)->root, tmp_name, FALSE, FALSE, FALSE); 4267 4268 BFD_ASSERT (myh == NULL); 4269 4270 bh = NULL; 4271 val = hash_table->vfp11_erratum_glue_size; 4272 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, 4273 tmp_name, BSF_FUNCTION | BSF_LOCAL, s, val, 4274 NULL, TRUE, FALSE, &bh); 4275 4276 myh = (struct elf_link_hash_entry *) bh; 4277 myh->type = ELF_ST_INFO (STB_LOCAL, STT_FUNC); 4278 myh->forced_local = 1; 4279 4280 /* Link veneer back to calling location. */ 4281 errcount = ++(sec_data->erratumcount); 4282 newerr = bfd_zmalloc (sizeof (elf32_vfp11_erratum_list)); 4283 4284 newerr->type = VFP11_ERRATUM_ARM_VENEER; 4285 newerr->vma = -1; 4286 newerr->u.v.branch = branch; 4287 newerr->u.v.id = hash_table->num_vfp11_fixes; 4288 branch->u.b.veneer = newerr; 4289 4290 newerr->next = sec_data->erratumlist; 4291 sec_data->erratumlist = newerr; 4292 4293 /* A symbol for the return from the veneer. */ 4294 sprintf (tmp_name, VFP11_ERRATUM_VENEER_ENTRY_NAME "_r", 4295 hash_table->num_vfp11_fixes); 4296 4297 myh = elf_link_hash_lookup 4298 (&(hash_table)->root, tmp_name, FALSE, FALSE, FALSE); 4299 4300 if (myh != NULL) 4301 abort (); 4302 4303 bh = NULL; 4304 val = offset + 4; 4305 _bfd_generic_link_add_one_symbol (link_info, branch_bfd, tmp_name, BSF_LOCAL, 4306 branch_sec, val, NULL, TRUE, FALSE, &bh); 4307 4308 myh = (struct elf_link_hash_entry *) bh; 4309 myh->type = ELF_ST_INFO (STB_LOCAL, STT_FUNC); 4310 myh->forced_local = 1; 4311 4312 free (tmp_name); 4313 4314 /* Generate a mapping symbol for the veneer section, and explicitly add an 4315 entry for that symbol to the code/data map for the section. */ 4316 if (hash_table->vfp11_erratum_glue_size == 0) 4317 { 4318 bh = NULL; 4319 /* FIXME: Creates an ARM symbol. Thumb mode will need attention if it 4320 ever requires this erratum fix. */ 4321 _bfd_generic_link_add_one_symbol (link_info, 4322 hash_table->bfd_of_glue_owner, "$a", 4323 BSF_LOCAL, s, 0, NULL, 4324 TRUE, FALSE, &bh); 4325 4326 myh = (struct elf_link_hash_entry *) bh; 4327 myh->type = ELF_ST_INFO (STB_LOCAL, STT_NOTYPE); 4328 myh->forced_local = 1; 4329 4330 /* The elf32_arm_init_maps function only cares about symbols from input 4331 BFDs. We must make a note of this generated mapping symbol 4332 ourselves so that code byteswapping works properly in 4333 elf32_arm_write_section. */ 4334 elf32_arm_section_map_add (s, 'a', 0); 4335 } 4336 4337 s->size += VFP11_ERRATUM_VENEER_SIZE; 4338 hash_table->vfp11_erratum_glue_size += VFP11_ERRATUM_VENEER_SIZE; 4339 hash_table->num_vfp11_fixes++; 4340 4341 /* The offset of the veneer. */ 4342 return val; 4343 } 4344 4345 /* Note: we do not include the flag SEC_LINKER_CREATED, as that 4346 would prevent elf_link_input_bfd() from processing the contents 4347 of the section. */ 4348 #define ARM_GLUE_SECTION_FLAGS \ 4349 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY) 4350 4351 /* Create a fake section for use by the ARM backend of the linker. */ 4352 4353 static bfd_boolean 4354 arm_make_glue_section (bfd * abfd, const char * name) 4355 { 4356 asection * sec; 4357 4358 sec = bfd_get_section_by_name (abfd, name); 4359 if (sec != NULL) 4360 /* Already made. */ 4361 return TRUE; 4362 4363 sec = bfd_make_section_with_flags (abfd, name, ARM_GLUE_SECTION_FLAGS); 4364 4365 if (sec == NULL 4366 || !bfd_set_section_alignment (abfd, sec, 2)) 4367 return FALSE; 4368 4369 /* Set the gc mark to prevent the section from being removed by garbage 4370 collection, despite the fact that no relocs refer to this section. */ 4371 sec->gc_mark = 1; 4372 4373 return TRUE; 4374 } 4375 4376 /* Add the glue sections to ABFD. This function is called from the 4377 linker scripts in ld/emultempl/{armelf}.em. */ 4378 4379 bfd_boolean 4380 bfd_elf32_arm_add_glue_sections_to_bfd (bfd *abfd, 4381 struct bfd_link_info *info) 4382 { 4383 /* If we are only performing a partial 4384 link do not bother adding the glue. */ 4385 if (info->relocatable) 4386 return TRUE; 4387 4388 /* Linker stubs don't need glue. */ 4389 if (!strcmp (abfd->filename, "linker stubs")) 4390 return TRUE; 4391 4392 return arm_make_glue_section (abfd, ARM2THUMB_GLUE_SECTION_NAME) 4393 && arm_make_glue_section (abfd, THUMB2ARM_GLUE_SECTION_NAME) 4394 && arm_make_glue_section (abfd, VFP11_ERRATUM_VENEER_SECTION_NAME) 4395 && arm_make_glue_section (abfd, ARM_BX_GLUE_SECTION_NAME); 4396 } 4397 4398 /* Select a BFD to be used to hold the sections used by the glue code. 4399 This function is called from the linker scripts in ld/emultempl/ 4400 {armelf/pe}.em. */ 4401 4402 bfd_boolean 4403 bfd_elf32_arm_get_bfd_for_interworking (bfd *abfd, struct bfd_link_info *info) 4404 { 4405 struct elf32_arm_link_hash_table *globals; 4406 4407 /* If we are only performing a partial link 4408 do not bother getting a bfd to hold the glue. */ 4409 if (info->relocatable) 4410 return TRUE; 4411 4412 /* Make sure we don't attach the glue sections to a dynamic object. */ 4413 BFD_ASSERT (!(abfd->flags & DYNAMIC)); 4414 4415 globals = elf32_arm_hash_table (info); 4416 4417 BFD_ASSERT (globals != NULL); 4418 4419 if (globals->bfd_of_glue_owner != NULL) 4420 return TRUE; 4421 4422 /* Save the bfd for later use. */ 4423 globals->bfd_of_glue_owner = abfd; 4424 4425 return TRUE; 4426 } 4427 4428 static void 4429 check_use_blx (struct elf32_arm_link_hash_table *globals) 4430 { 4431 if (bfd_elf_get_obj_attr_int (globals->obfd, OBJ_ATTR_PROC, 4432 Tag_CPU_arch) > 2) 4433 globals->use_blx = 1; 4434 } 4435 4436 bfd_boolean 4437 bfd_elf32_arm_process_before_allocation (bfd *abfd, 4438 struct bfd_link_info *link_info) 4439 { 4440 Elf_Internal_Shdr *symtab_hdr; 4441 Elf_Internal_Rela *internal_relocs = NULL; 4442 Elf_Internal_Rela *irel, *irelend; 4443 bfd_byte *contents = NULL; 4444 4445 asection *sec; 4446 struct elf32_arm_link_hash_table *globals; 4447 4448 /* If we are only performing a partial link do not bother 4449 to construct any glue. */ 4450 if (link_info->relocatable) 4451 return TRUE; 4452 4453 /* Here we have a bfd that is to be included on the link. We have a 4454 hook to do reloc rummaging, before section sizes are nailed down. */ 4455 globals = elf32_arm_hash_table (link_info); 4456 4457 BFD_ASSERT (globals != NULL); 4458 4459 check_use_blx (globals); 4460 4461 if (globals->byteswap_code && !bfd_big_endian (abfd)) 4462 { 4463 _bfd_error_handler (_("%B: BE8 images only valid in big-endian mode."), 4464 abfd); 4465 return FALSE; 4466 } 4467 4468 /* PR 5398: If we have not decided to include any loadable sections in 4469 the output then we will not have a glue owner bfd. This is OK, it 4470 just means that there is nothing else for us to do here. */ 4471 if (globals->bfd_of_glue_owner == NULL) 4472 return TRUE; 4473 4474 /* Rummage around all the relocs and map the glue vectors. */ 4475 sec = abfd->sections; 4476 4477 if (sec == NULL) 4478 return TRUE; 4479 4480 for (; sec != NULL; sec = sec->next) 4481 { 4482 if (sec->reloc_count == 0) 4483 continue; 4484 4485 if ((sec->flags & SEC_EXCLUDE) != 0) 4486 continue; 4487 4488 symtab_hdr = & elf_symtab_hdr (abfd); 4489 4490 /* Load the relocs. */ 4491 internal_relocs 4492 = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, FALSE); 4493 4494 if (internal_relocs == NULL) 4495 goto error_return; 4496 4497 irelend = internal_relocs + sec->reloc_count; 4498 for (irel = internal_relocs; irel < irelend; irel++) 4499 { 4500 long r_type; 4501 unsigned long r_index; 4502 4503 struct elf_link_hash_entry *h; 4504 4505 r_type = ELF32_R_TYPE (irel->r_info); 4506 r_index = ELF32_R_SYM (irel->r_info); 4507 4508 /* These are the only relocation types we care about. */ 4509 if ( r_type != R_ARM_PC24 4510 && r_type != R_ARM_PLT32 4511 && r_type != R_ARM_JUMP24 4512 && r_type != R_ARM_THM_JUMP24 4513 && (r_type != R_ARM_V4BX || globals->fix_v4bx < 2)) 4514 continue; 4515 4516 /* Get the section contents if we haven't done so already. */ 4517 if (contents == NULL) 4518 { 4519 /* Get cached copy if it exists. */ 4520 if (elf_section_data (sec)->this_hdr.contents != NULL) 4521 contents = elf_section_data (sec)->this_hdr.contents; 4522 else 4523 { 4524 /* Go get them off disk. */ 4525 if (! bfd_malloc_and_get_section (abfd, sec, &contents)) 4526 goto error_return; 4527 } 4528 } 4529 4530 if (r_type == R_ARM_V4BX) 4531 { 4532 int reg; 4533 4534 reg = bfd_get_32 (abfd, contents + irel->r_offset) & 0xf; 4535 record_arm_bx_glue (link_info, reg); 4536 continue; 4537 } 4538 4539 /* If the relocation is not against a symbol it cannot concern us. */ 4540 h = NULL; 4541 4542 /* We don't care about local symbols. */ 4543 if (r_index < symtab_hdr->sh_info) 4544 continue; 4545 4546 /* This is an external symbol. */ 4547 r_index -= symtab_hdr->sh_info; 4548 h = (struct elf_link_hash_entry *) 4549 elf_sym_hashes (abfd)[r_index]; 4550 4551 /* If the relocation is against a static symbol it must be within 4552 the current section and so cannot be a cross ARM/Thumb relocation. */ 4553 if (h == NULL) 4554 continue; 4555 4556 /* If the call will go through a PLT entry then we do not need 4557 glue. */ 4558 if (globals->splt != NULL && h->plt.offset != (bfd_vma) -1) 4559 continue; 4560 4561 switch (r_type) 4562 { 4563 case R_ARM_PC24: 4564 case R_ARM_PLT32: 4565 case R_ARM_JUMP24: 4566 /* This one is a call from arm code. We need to look up 4567 the target of the call. If it is a thumb target, we 4568 insert glue. */ 4569 if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC 4570 && !(r_type == R_ARM_CALL && globals->use_blx)) 4571 record_arm_to_thumb_glue (link_info, h); 4572 break; 4573 4574 case R_ARM_THM_JUMP24: 4575 /* This one is a call from thumb code. We look 4576 up the target of the call. If it is not a thumb 4577 target, we insert glue. */ 4578 if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC 4579 && !(globals->use_blx && r_type == R_ARM_THM_CALL) 4580 && h->root.type != bfd_link_hash_undefweak) 4581 record_thumb_to_arm_glue (link_info, h); 4582 break; 4583 4584 default: 4585 abort (); 4586 } 4587 } 4588 4589 if (contents != NULL 4590 && elf_section_data (sec)->this_hdr.contents != contents) 4591 free (contents); 4592 contents = NULL; 4593 4594 if (internal_relocs != NULL 4595 && elf_section_data (sec)->relocs != internal_relocs) 4596 free (internal_relocs); 4597 internal_relocs = NULL; 4598 } 4599 4600 return TRUE; 4601 4602 error_return: 4603 if (contents != NULL 4604 && elf_section_data (sec)->this_hdr.contents != contents) 4605 free (contents); 4606 if (internal_relocs != NULL 4607 && elf_section_data (sec)->relocs != internal_relocs) 4608 free (internal_relocs); 4609 4610 return FALSE; 4611 } 4612 #endif 4613 4614 4615 /* Initialise maps of ARM/Thumb/data for input BFDs. */ 4616 4617 void 4618 bfd_elf32_arm_init_maps (bfd *abfd) 4619 { 4620 Elf_Internal_Sym *isymbuf; 4621 Elf_Internal_Shdr *hdr; 4622 unsigned int i, localsyms; 4623 4624 if ((abfd->flags & DYNAMIC) != 0) 4625 return; 4626 4627 hdr = & elf_symtab_hdr (abfd); 4628 localsyms = hdr->sh_info; 4629 4630 /* Obtain a buffer full of symbols for this BFD. The hdr->sh_info field 4631 should contain the number of local symbols, which should come before any 4632 global symbols. Mapping symbols are always local. */ 4633 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, localsyms, 0, NULL, NULL, 4634 NULL); 4635 4636 /* No internal symbols read? Skip this BFD. */ 4637 if (isymbuf == NULL) 4638 return; 4639 4640 for (i = 0; i < localsyms; i++) 4641 { 4642 Elf_Internal_Sym *isym = &isymbuf[i]; 4643 asection *sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 4644 const char *name; 4645 4646 if (sec != NULL 4647 && ELF_ST_BIND (isym->st_info) == STB_LOCAL) 4648 { 4649 name = bfd_elf_string_from_elf_section (abfd, 4650 hdr->sh_link, isym->st_name); 4651 4652 if (bfd_is_arm_special_symbol_name (name, 4653 BFD_ARM_SPECIAL_SYM_TYPE_MAP)) 4654 elf32_arm_section_map_add (sec, name[1], isym->st_value); 4655 } 4656 } 4657 } 4658 4659 4660 void 4661 bfd_elf32_arm_set_vfp11_fix (bfd *obfd, struct bfd_link_info *link_info) 4662 { 4663 struct elf32_arm_link_hash_table *globals = elf32_arm_hash_table (link_info); 4664 obj_attribute *out_attr = elf_known_obj_attributes_proc (obfd); 4665 4666 /* We assume that ARMv7+ does not need the VFP11 denorm erratum fix. */ 4667 if (out_attr[Tag_CPU_arch].i >= TAG_CPU_ARCH_V7) 4668 { 4669 switch (globals->vfp11_fix) 4670 { 4671 case BFD_ARM_VFP11_FIX_DEFAULT: 4672 case BFD_ARM_VFP11_FIX_NONE: 4673 globals->vfp11_fix = BFD_ARM_VFP11_FIX_NONE; 4674 break; 4675 4676 default: 4677 /* Give a warning, but do as the user requests anyway. */ 4678 (*_bfd_error_handler) (_("%B: warning: selected VFP11 erratum " 4679 "workaround is not necessary for target architecture"), obfd); 4680 } 4681 } 4682 else if (globals->vfp11_fix == BFD_ARM_VFP11_FIX_DEFAULT) 4683 /* For earlier architectures, we might need the workaround, but do not 4684 enable it by default. If users is running with broken hardware, they 4685 must enable the erratum fix explicitly. */ 4686 globals->vfp11_fix = BFD_ARM_VFP11_FIX_NONE; 4687 } 4688 4689 4690 enum bfd_arm_vfp11_pipe 4691 { 4692 VFP11_FMAC, 4693 VFP11_LS, 4694 VFP11_DS, 4695 VFP11_BAD 4696 }; 4697 4698 /* Return a VFP register number. This is encoded as RX:X for single-precision 4699 registers, or X:RX for double-precision registers, where RX is the group of 4700 four bits in the instruction encoding and X is the single extension bit. 4701 RX and X fields are specified using their lowest (starting) bit. The return 4702 value is: 4703 4704 0...31: single-precision registers s0...s31 4705 32...63: double-precision registers d0...d31. 4706 4707 Although X should be zero for VFP11 (encoding d0...d15 only), we might 4708 encounter VFP3 instructions, so we allow the full range for DP registers. */ 4709 4710 static unsigned int 4711 bfd_arm_vfp11_regno (unsigned int insn, bfd_boolean is_double, unsigned int rx, 4712 unsigned int x) 4713 { 4714 if (is_double) 4715 return (((insn >> rx) & 0xf) | (((insn >> x) & 1) << 4)) + 32; 4716 else 4717 return (((insn >> rx) & 0xf) << 1) | ((insn >> x) & 1); 4718 } 4719 4720 /* Set bits in *WMASK according to a register number REG as encoded by 4721 bfd_arm_vfp11_regno(). Ignore d16-d31. */ 4722 4723 static void 4724 bfd_arm_vfp11_write_mask (unsigned int *wmask, unsigned int reg) 4725 { 4726 if (reg < 32) 4727 *wmask |= 1 << reg; 4728 else if (reg < 48) 4729 *wmask |= 3 << ((reg - 32) * 2); 4730 } 4731 4732 /* Return TRUE if WMASK overwrites anything in REGS. */ 4733 4734 static bfd_boolean 4735 bfd_arm_vfp11_antidependency (unsigned int wmask, int *regs, int numregs) 4736 { 4737 int i; 4738 4739 for (i = 0; i < numregs; i++) 4740 { 4741 unsigned int reg = regs[i]; 4742 4743 if (reg < 32 && (wmask & (1 << reg)) != 0) 4744 return TRUE; 4745 4746 reg -= 32; 4747 4748 if (reg >= 16) 4749 continue; 4750 4751 if ((wmask & (3 << (reg * 2))) != 0) 4752 return TRUE; 4753 } 4754 4755 return FALSE; 4756 } 4757 4758 /* In this function, we're interested in two things: finding input registers 4759 for VFP data-processing instructions, and finding the set of registers which 4760 arbitrary VFP instructions may write to. We use a 32-bit unsigned int to 4761 hold the written set, so FLDM etc. are easy to deal with (we're only 4762 interested in 32 SP registers or 16 dp registers, due to the VFP version 4763 implemented by the chip in question). DP registers are marked by setting 4764 both SP registers in the write mask). */ 4765 4766 static enum bfd_arm_vfp11_pipe 4767 bfd_arm_vfp11_insn_decode (unsigned int insn, unsigned int *destmask, int *regs, 4768 int *numregs) 4769 { 4770 enum bfd_arm_vfp11_pipe pipe = VFP11_BAD; 4771 bfd_boolean is_double = ((insn & 0xf00) == 0xb00) ? 1 : 0; 4772 4773 if ((insn & 0x0f000e10) == 0x0e000a00) /* A data-processing insn. */ 4774 { 4775 unsigned int pqrs; 4776 unsigned int fd = bfd_arm_vfp11_regno (insn, is_double, 12, 22); 4777 unsigned int fm = bfd_arm_vfp11_regno (insn, is_double, 0, 5); 4778 4779 pqrs = ((insn & 0x00800000) >> 20) 4780 | ((insn & 0x00300000) >> 19) 4781 | ((insn & 0x00000040) >> 6); 4782 4783 switch (pqrs) 4784 { 4785 case 0: /* fmac[sd]. */ 4786 case 1: /* fnmac[sd]. */ 4787 case 2: /* fmsc[sd]. */ 4788 case 3: /* fnmsc[sd]. */ 4789 pipe = VFP11_FMAC; 4790 bfd_arm_vfp11_write_mask (destmask, fd); 4791 regs[0] = fd; 4792 regs[1] = bfd_arm_vfp11_regno (insn, is_double, 16, 7); /* Fn. */ 4793 regs[2] = fm; 4794 *numregs = 3; 4795 break; 4796 4797 case 4: /* fmul[sd]. */ 4798 case 5: /* fnmul[sd]. */ 4799 case 6: /* fadd[sd]. */ 4800 case 7: /* fsub[sd]. */ 4801 pipe = VFP11_FMAC; 4802 goto vfp_binop; 4803 4804 case 8: /* fdiv[sd]. */ 4805 pipe = VFP11_DS; 4806 vfp_binop: 4807 bfd_arm_vfp11_write_mask (destmask, fd); 4808 regs[0] = bfd_arm_vfp11_regno (insn, is_double, 16, 7); /* Fn. */ 4809 regs[1] = fm; 4810 *numregs = 2; 4811 break; 4812 4813 case 15: /* extended opcode. */ 4814 { 4815 unsigned int extn = ((insn >> 15) & 0x1e) 4816 | ((insn >> 7) & 1); 4817 4818 switch (extn) 4819 { 4820 case 0: /* fcpy[sd]. */ 4821 case 1: /* fabs[sd]. */ 4822 case 2: /* fneg[sd]. */ 4823 case 8: /* fcmp[sd]. */ 4824 case 9: /* fcmpe[sd]. */ 4825 case 10: /* fcmpz[sd]. */ 4826 case 11: /* fcmpez[sd]. */ 4827 case 16: /* fuito[sd]. */ 4828 case 17: /* fsito[sd]. */ 4829 case 24: /* ftoui[sd]. */ 4830 case 25: /* ftouiz[sd]. */ 4831 case 26: /* ftosi[sd]. */ 4832 case 27: /* ftosiz[sd]. */ 4833 /* These instructions will not bounce due to underflow. */ 4834 *numregs = 0; 4835 pipe = VFP11_FMAC; 4836 break; 4837 4838 case 3: /* fsqrt[sd]. */ 4839 /* fsqrt cannot underflow, but it can (perhaps) overwrite 4840 registers to cause the erratum in previous instructions. */ 4841 bfd_arm_vfp11_write_mask (destmask, fd); 4842 pipe = VFP11_DS; 4843 break; 4844 4845 case 15: /* fcvt{ds,sd}. */ 4846 { 4847 int rnum = 0; 4848 4849 bfd_arm_vfp11_write_mask (destmask, fd); 4850 4851 /* Only FCVTSD can underflow. */ 4852 if ((insn & 0x100) != 0) 4853 regs[rnum++] = fm; 4854 4855 *numregs = rnum; 4856 4857 pipe = VFP11_FMAC; 4858 } 4859 break; 4860 4861 default: 4862 return VFP11_BAD; 4863 } 4864 } 4865 break; 4866 4867 default: 4868 return VFP11_BAD; 4869 } 4870 } 4871 /* Two-register transfer. */ 4872 else if ((insn & 0x0fe00ed0) == 0x0c400a10) 4873 { 4874 unsigned int fm = bfd_arm_vfp11_regno (insn, is_double, 0, 5); 4875 4876 if ((insn & 0x100000) == 0) 4877 { 4878 if (is_double) 4879 bfd_arm_vfp11_write_mask (destmask, fm); 4880 else 4881 { 4882 bfd_arm_vfp11_write_mask (destmask, fm); 4883 bfd_arm_vfp11_write_mask (destmask, fm + 1); 4884 } 4885 } 4886 4887 pipe = VFP11_LS; 4888 } 4889 else if ((insn & 0x0e100e00) == 0x0c100a00) /* A load insn. */ 4890 { 4891 int fd = bfd_arm_vfp11_regno (insn, is_double, 12, 22); 4892 unsigned int puw = ((insn >> 21) & 0x1) | (((insn >> 23) & 3) << 1); 4893 4894 switch (puw) 4895 { 4896 case 0: /* Two-reg transfer. We should catch these above. */ 4897 abort (); 4898 4899 case 2: /* fldm[sdx]. */ 4900 case 3: 4901 case 5: 4902 { 4903 unsigned int i, offset = insn & 0xff; 4904 4905 if (is_double) 4906 offset >>= 1; 4907 4908 for (i = fd; i < fd + offset; i++) 4909 bfd_arm_vfp11_write_mask (destmask, i); 4910 } 4911 break; 4912 4913 case 4: /* fld[sd]. */ 4914 case 6: 4915 bfd_arm_vfp11_write_mask (destmask, fd); 4916 break; 4917 4918 default: 4919 return VFP11_BAD; 4920 } 4921 4922 pipe = VFP11_LS; 4923 } 4924 /* Single-register transfer. Note L==0. */ 4925 else if ((insn & 0x0f100e10) == 0x0e000a10) 4926 { 4927 unsigned int opcode = (insn >> 21) & 7; 4928 unsigned int fn = bfd_arm_vfp11_regno (insn, is_double, 16, 7); 4929 4930 switch (opcode) 4931 { 4932 case 0: /* fmsr/fmdlr. */ 4933 case 1: /* fmdhr. */ 4934 /* Mark fmdhr and fmdlr as writing to the whole of the DP 4935 destination register. I don't know if this is exactly right, 4936 but it is the conservative choice. */ 4937 bfd_arm_vfp11_write_mask (destmask, fn); 4938 break; 4939 4940 case 7: /* fmxr. */ 4941 break; 4942 } 4943 4944 pipe = VFP11_LS; 4945 } 4946 4947 return pipe; 4948 } 4949 4950 4951 static int elf32_arm_compare_mapping (const void * a, const void * b); 4952 4953 4954 /* Look for potentially-troublesome code sequences which might trigger the 4955 VFP11 denormal/antidependency erratum. See, e.g., the ARM1136 errata sheet 4956 (available from ARM) for details of the erratum. A short version is 4957 described in ld.texinfo. */ 4958 4959 bfd_boolean 4960 bfd_elf32_arm_vfp11_erratum_scan (bfd *abfd, struct bfd_link_info *link_info) 4961 { 4962 asection *sec; 4963 bfd_byte *contents = NULL; 4964 int state = 0; 4965 int regs[3], numregs = 0; 4966 struct elf32_arm_link_hash_table *globals = elf32_arm_hash_table (link_info); 4967 int use_vector = (globals->vfp11_fix == BFD_ARM_VFP11_FIX_VECTOR); 4968 4969 /* We use a simple FSM to match troublesome VFP11 instruction sequences. 4970 The states transition as follows: 4971 4972 0 -> 1 (vector) or 0 -> 2 (scalar) 4973 A VFP FMAC-pipeline instruction has been seen. Fill 4974 regs[0]..regs[numregs-1] with its input operands. Remember this 4975 instruction in 'first_fmac'. 4976 4977 1 -> 2 4978 Any instruction, except for a VFP instruction which overwrites 4979 regs[*]. 4980 4981 1 -> 3 [ -> 0 ] or 4982 2 -> 3 [ -> 0 ] 4983 A VFP instruction has been seen which overwrites any of regs[*]. 4984 We must make a veneer! Reset state to 0 before examining next 4985 instruction. 4986 4987 2 -> 0 4988 If we fail to match anything in state 2, reset to state 0 and reset 4989 the instruction pointer to the instruction after 'first_fmac'. 4990 4991 If the VFP11 vector mode is in use, there must be at least two unrelated 4992 instructions between anti-dependent VFP11 instructions to properly avoid 4993 triggering the erratum, hence the use of the extra state 1. */ 4994 4995 /* If we are only performing a partial link do not bother 4996 to construct any glue. */ 4997 if (link_info->relocatable) 4998 return TRUE; 4999 5000 /* Skip if this bfd does not correspond to an ELF image. */ 5001 if (! is_arm_elf (abfd)) 5002 return TRUE; 5003 5004 /* We should have chosen a fix type by the time we get here. */ 5005 BFD_ASSERT (globals->vfp11_fix != BFD_ARM_VFP11_FIX_DEFAULT); 5006 5007 if (globals->vfp11_fix == BFD_ARM_VFP11_FIX_NONE) 5008 return TRUE; 5009 5010 for (sec = abfd->sections; sec != NULL; sec = sec->next) 5011 { 5012 unsigned int i, span, first_fmac = 0, veneer_of_insn = 0; 5013 struct _arm_elf_section_data *sec_data; 5014 5015 /* If we don't have executable progbits, we're not interested in this 5016 section. Also skip if section is to be excluded. */ 5017 if (elf_section_type (sec) != SHT_PROGBITS 5018 || (elf_section_flags (sec) & SHF_EXECINSTR) == 0 5019 || (sec->flags & SEC_EXCLUDE) != 0 5020 || strcmp (sec->name, VFP11_ERRATUM_VENEER_SECTION_NAME) == 0) 5021 continue; 5022 5023 sec_data = elf32_arm_section_data (sec); 5024 5025 if (sec_data->mapcount == 0) 5026 continue; 5027 5028 if (elf_section_data (sec)->this_hdr.contents != NULL) 5029 contents = elf_section_data (sec)->this_hdr.contents; 5030 else if (! bfd_malloc_and_get_section (abfd, sec, &contents)) 5031 goto error_return; 5032 5033 qsort (sec_data->map, sec_data->mapcount, sizeof (elf32_arm_section_map), 5034 elf32_arm_compare_mapping); 5035 5036 for (span = 0; span < sec_data->mapcount; span++) 5037 { 5038 unsigned int span_start = sec_data->map[span].vma; 5039 unsigned int span_end = (span == sec_data->mapcount - 1) 5040 ? sec->size : sec_data->map[span + 1].vma; 5041 char span_type = sec_data->map[span].type; 5042 5043 /* FIXME: Only ARM mode is supported at present. We may need to 5044 support Thumb-2 mode also at some point. */ 5045 if (span_type != 'a') 5046 continue; 5047 5048 for (i = span_start; i < span_end;) 5049 { 5050 unsigned int next_i = i + 4; 5051 unsigned int insn = bfd_big_endian (abfd) 5052 ? (contents[i] << 24) 5053 | (contents[i + 1] << 16) 5054 | (contents[i + 2] << 8) 5055 | contents[i + 3] 5056 : (contents[i + 3] << 24) 5057 | (contents[i + 2] << 16) 5058 | (contents[i + 1] << 8) 5059 | contents[i]; 5060 unsigned int writemask = 0; 5061 enum bfd_arm_vfp11_pipe pipe; 5062 5063 switch (state) 5064 { 5065 case 0: 5066 pipe = bfd_arm_vfp11_insn_decode (insn, &writemask, regs, 5067 &numregs); 5068 /* I'm assuming the VFP11 erratum can trigger with denorm 5069 operands on either the FMAC or the DS pipeline. This might 5070 lead to slightly overenthusiastic veneer insertion. */ 5071 if (pipe == VFP11_FMAC || pipe == VFP11_DS) 5072 { 5073 state = use_vector ? 1 : 2; 5074 first_fmac = i; 5075 veneer_of_insn = insn; 5076 } 5077 break; 5078 5079 case 1: 5080 { 5081 int other_regs[3], other_numregs; 5082 pipe = bfd_arm_vfp11_insn_decode (insn, &writemask, 5083 other_regs, 5084 &other_numregs); 5085 if (pipe != VFP11_BAD 5086 && bfd_arm_vfp11_antidependency (writemask, regs, 5087 numregs)) 5088 state = 3; 5089 else 5090 state = 2; 5091 } 5092 break; 5093 5094 case 2: 5095 { 5096 int other_regs[3], other_numregs; 5097 pipe = bfd_arm_vfp11_insn_decode (insn, &writemask, 5098 other_regs, 5099 &other_numregs); 5100 if (pipe != VFP11_BAD 5101 && bfd_arm_vfp11_antidependency (writemask, regs, 5102 numregs)) 5103 state = 3; 5104 else 5105 { 5106 state = 0; 5107 next_i = first_fmac + 4; 5108 } 5109 } 5110 break; 5111 5112 case 3: 5113 abort (); /* Should be unreachable. */ 5114 } 5115 5116 if (state == 3) 5117 { 5118 elf32_vfp11_erratum_list *newerr 5119 = bfd_zmalloc (sizeof (elf32_vfp11_erratum_list)); 5120 int errcount; 5121 5122 errcount = ++(elf32_arm_section_data (sec)->erratumcount); 5123 5124 newerr->u.b.vfp_insn = veneer_of_insn; 5125 5126 switch (span_type) 5127 { 5128 case 'a': 5129 newerr->type = VFP11_ERRATUM_BRANCH_TO_ARM_VENEER; 5130 break; 5131 5132 default: 5133 abort (); 5134 } 5135 5136 record_vfp11_erratum_veneer (link_info, newerr, abfd, sec, 5137 first_fmac); 5138 5139 newerr->vma = -1; 5140 5141 newerr->next = sec_data->erratumlist; 5142 sec_data->erratumlist = newerr; 5143 5144 state = 0; 5145 } 5146 5147 i = next_i; 5148 } 5149 } 5150 5151 if (contents != NULL 5152 && elf_section_data (sec)->this_hdr.contents != contents) 5153 free (contents); 5154 contents = NULL; 5155 } 5156 5157 return TRUE; 5158 5159 error_return: 5160 if (contents != NULL 5161 && elf_section_data (sec)->this_hdr.contents != contents) 5162 free (contents); 5163 5164 return FALSE; 5165 } 5166 5167 /* Find virtual-memory addresses for VFP11 erratum veneers and return locations 5168 after sections have been laid out, using specially-named symbols. */ 5169 5170 void 5171 bfd_elf32_arm_vfp11_fix_veneer_locations (bfd *abfd, 5172 struct bfd_link_info *link_info) 5173 { 5174 asection *sec; 5175 struct elf32_arm_link_hash_table *globals; 5176 char *tmp_name; 5177 5178 if (link_info->relocatable) 5179 return; 5180 5181 /* Skip if this bfd does not correspond to an ELF image. */ 5182 if (! is_arm_elf (abfd)) 5183 return; 5184 5185 globals = elf32_arm_hash_table (link_info); 5186 5187 tmp_name = bfd_malloc ((bfd_size_type) strlen 5188 (VFP11_ERRATUM_VENEER_ENTRY_NAME) + 10); 5189 5190 for (sec = abfd->sections; sec != NULL; sec = sec->next) 5191 { 5192 struct _arm_elf_section_data *sec_data = elf32_arm_section_data (sec); 5193 elf32_vfp11_erratum_list *errnode = sec_data->erratumlist; 5194 5195 for (; errnode != NULL; errnode = errnode->next) 5196 { 5197 struct elf_link_hash_entry *myh; 5198 bfd_vma vma; 5199 5200 switch (errnode->type) 5201 { 5202 case VFP11_ERRATUM_BRANCH_TO_ARM_VENEER: 5203 case VFP11_ERRATUM_BRANCH_TO_THUMB_VENEER: 5204 /* Find veneer symbol. */ 5205 sprintf (tmp_name, VFP11_ERRATUM_VENEER_ENTRY_NAME, 5206 errnode->u.b.veneer->u.v.id); 5207 5208 myh = elf_link_hash_lookup 5209 (&(globals)->root, tmp_name, FALSE, FALSE, TRUE); 5210 5211 if (myh == NULL) 5212 (*_bfd_error_handler) (_("%B: unable to find VFP11 veneer " 5213 "`%s'"), abfd, tmp_name); 5214 5215 vma = myh->root.u.def.section->output_section->vma 5216 + myh->root.u.def.section->output_offset 5217 + myh->root.u.def.value; 5218 5219 errnode->u.b.veneer->vma = vma; 5220 break; 5221 5222 case VFP11_ERRATUM_ARM_VENEER: 5223 case VFP11_ERRATUM_THUMB_VENEER: 5224 /* Find return location. */ 5225 sprintf (tmp_name, VFP11_ERRATUM_VENEER_ENTRY_NAME "_r", 5226 errnode->u.v.id); 5227 5228 myh = elf_link_hash_lookup 5229 (&(globals)->root, tmp_name, FALSE, FALSE, TRUE); 5230 5231 if (myh == NULL) 5232 (*_bfd_error_handler) (_("%B: unable to find VFP11 veneer " 5233 "`%s'"), abfd, tmp_name); 5234 5235 vma = myh->root.u.def.section->output_section->vma 5236 + myh->root.u.def.section->output_offset 5237 + myh->root.u.def.value; 5238 5239 errnode->u.v.branch->vma = vma; 5240 break; 5241 5242 default: 5243 abort (); 5244 } 5245 } 5246 } 5247 5248 free (tmp_name); 5249 } 5250 5251 5252 /* Set target relocation values needed during linking. */ 5253 5254 void 5255 bfd_elf32_arm_set_target_relocs (struct bfd *output_bfd, 5256 struct bfd_link_info *link_info, 5257 int target1_is_rel, 5258 char * target2_type, 5259 int fix_v4bx, 5260 int use_blx, 5261 bfd_arm_vfp11_fix vfp11_fix, 5262 int no_enum_warn, int no_wchar_warn, 5263 int pic_veneer) 5264 { 5265 struct elf32_arm_link_hash_table *globals; 5266 5267 globals = elf32_arm_hash_table (link_info); 5268 5269 globals->target1_is_rel = target1_is_rel; 5270 if (strcmp (target2_type, "rel") == 0) 5271 globals->target2_reloc = R_ARM_REL32; 5272 else if (strcmp (target2_type, "abs") == 0) 5273 globals->target2_reloc = R_ARM_ABS32; 5274 else if (strcmp (target2_type, "got-rel") == 0) 5275 globals->target2_reloc = R_ARM_GOT_PREL; 5276 else 5277 { 5278 _bfd_error_handler (_("Invalid TARGET2 relocation type '%s'."), 5279 target2_type); 5280 } 5281 globals->fix_v4bx = fix_v4bx; 5282 globals->use_blx |= use_blx; 5283 globals->vfp11_fix = vfp11_fix; 5284 globals->pic_veneer = pic_veneer; 5285 5286 BFD_ASSERT (is_arm_elf (output_bfd)); 5287 elf_arm_tdata (output_bfd)->no_enum_size_warning = no_enum_warn; 5288 elf_arm_tdata (output_bfd)->no_wchar_size_warning = no_wchar_warn; 5289 } 5290 5291 /* Replace the target offset of a Thumb bl or b.w instruction. */ 5292 5293 static void 5294 insert_thumb_branch (bfd *abfd, long int offset, bfd_byte *insn) 5295 { 5296 bfd_vma upper; 5297 bfd_vma lower; 5298 int reloc_sign; 5299 5300 BFD_ASSERT ((offset & 1) == 0); 5301 5302 upper = bfd_get_16 (abfd, insn); 5303 lower = bfd_get_16 (abfd, insn + 2); 5304 reloc_sign = (offset < 0) ? 1 : 0; 5305 upper = (upper & ~(bfd_vma) 0x7ff) 5306 | ((offset >> 12) & 0x3ff) 5307 | (reloc_sign << 10); 5308 lower = (lower & ~(bfd_vma) 0x2fff) 5309 | (((!((offset >> 23) & 1)) ^ reloc_sign) << 13) 5310 | (((!((offset >> 22) & 1)) ^ reloc_sign) << 11) 5311 | ((offset >> 1) & 0x7ff); 5312 bfd_put_16 (abfd, upper, insn); 5313 bfd_put_16 (abfd, lower, insn + 2); 5314 } 5315 5316 /* Thumb code calling an ARM function. */ 5317 5318 static int 5319 elf32_thumb_to_arm_stub (struct bfd_link_info * info, 5320 const char * name, 5321 bfd * input_bfd, 5322 bfd * output_bfd, 5323 asection * input_section, 5324 bfd_byte * hit_data, 5325 asection * sym_sec, 5326 bfd_vma offset, 5327 bfd_signed_vma addend, 5328 bfd_vma val, 5329 char **error_message) 5330 { 5331 asection * s = 0; 5332 bfd_vma my_offset; 5333 long int ret_offset; 5334 struct elf_link_hash_entry * myh; 5335 struct elf32_arm_link_hash_table * globals; 5336 5337 myh = find_thumb_glue (info, name, error_message); 5338 if (myh == NULL) 5339 return FALSE; 5340 5341 globals = elf32_arm_hash_table (info); 5342 5343 BFD_ASSERT (globals != NULL); 5344 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 5345 5346 my_offset = myh->root.u.def.value; 5347 5348 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 5349 THUMB2ARM_GLUE_SECTION_NAME); 5350 5351 BFD_ASSERT (s != NULL); 5352 BFD_ASSERT (s->contents != NULL); 5353 BFD_ASSERT (s->output_section != NULL); 5354 5355 if ((my_offset & 0x01) == 0x01) 5356 { 5357 if (sym_sec != NULL 5358 && sym_sec->owner != NULL 5359 && !INTERWORK_FLAG (sym_sec->owner)) 5360 { 5361 (*_bfd_error_handler) 5362 (_("%B(%s): warning: interworking not enabled.\n" 5363 " first occurrence: %B: thumb call to arm"), 5364 sym_sec->owner, input_bfd, name); 5365 5366 return FALSE; 5367 } 5368 5369 --my_offset; 5370 myh->root.u.def.value = my_offset; 5371 5372 put_thumb_insn (globals, output_bfd, (bfd_vma) t2a1_bx_pc_insn, 5373 s->contents + my_offset); 5374 5375 put_thumb_insn (globals, output_bfd, (bfd_vma) t2a2_noop_insn, 5376 s->contents + my_offset + 2); 5377 5378 ret_offset = 5379 /* Address of destination of the stub. */ 5380 ((bfd_signed_vma) val) 5381 - ((bfd_signed_vma) 5382 /* Offset from the start of the current section 5383 to the start of the stubs. */ 5384 (s->output_offset 5385 /* Offset of the start of this stub from the start of the stubs. */ 5386 + my_offset 5387 /* Address of the start of the current section. */ 5388 + s->output_section->vma) 5389 /* The branch instruction is 4 bytes into the stub. */ 5390 + 4 5391 /* ARM branches work from the pc of the instruction + 8. */ 5392 + 8); 5393 5394 put_arm_insn (globals, output_bfd, 5395 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), 5396 s->contents + my_offset + 4); 5397 } 5398 5399 BFD_ASSERT (my_offset <= globals->thumb_glue_size); 5400 5401 /* Now go back and fix up the original BL insn to point to here. */ 5402 ret_offset = 5403 /* Address of where the stub is located. */ 5404 (s->output_section->vma + s->output_offset + my_offset) 5405 /* Address of where the BL is located. */ 5406 - (input_section->output_section->vma + input_section->output_offset 5407 + offset) 5408 /* Addend in the relocation. */ 5409 - addend 5410 /* Biassing for PC-relative addressing. */ 5411 - 8; 5412 5413 insert_thumb_branch (input_bfd, ret_offset, hit_data - input_section->vma); 5414 5415 return TRUE; 5416 } 5417 5418 /* Populate an Arm to Thumb stub. Returns the stub symbol. */ 5419 5420 static struct elf_link_hash_entry * 5421 elf32_arm_create_thumb_stub (struct bfd_link_info * info, 5422 const char * name, 5423 bfd * input_bfd, 5424 bfd * output_bfd, 5425 asection * sym_sec, 5426 bfd_vma val, 5427 asection * s, 5428 char ** error_message) 5429 { 5430 bfd_vma my_offset; 5431 long int ret_offset; 5432 struct elf_link_hash_entry * myh; 5433 struct elf32_arm_link_hash_table * globals; 5434 5435 myh = find_arm_glue (info, name, error_message); 5436 if (myh == NULL) 5437 return NULL; 5438 5439 globals = elf32_arm_hash_table (info); 5440 5441 BFD_ASSERT (globals != NULL); 5442 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 5443 5444 my_offset = myh->root.u.def.value; 5445 5446 if ((my_offset & 0x01) == 0x01) 5447 { 5448 if (sym_sec != NULL 5449 && sym_sec->owner != NULL 5450 && !INTERWORK_FLAG (sym_sec->owner)) 5451 { 5452 (*_bfd_error_handler) 5453 (_("%B(%s): warning: interworking not enabled.\n" 5454 " first occurrence: %B: arm call to thumb"), 5455 sym_sec->owner, input_bfd, name); 5456 } 5457 5458 --my_offset; 5459 myh->root.u.def.value = my_offset; 5460 5461 if (info->shared || globals->root.is_relocatable_executable 5462 || globals->pic_veneer) 5463 { 5464 /* For relocatable objects we can't use absolute addresses, 5465 so construct the address from a relative offset. */ 5466 /* TODO: If the offset is small it's probably worth 5467 constructing the address with adds. */ 5468 put_arm_insn (globals, output_bfd, (bfd_vma) a2t1p_ldr_insn, 5469 s->contents + my_offset); 5470 put_arm_insn (globals, output_bfd, (bfd_vma) a2t2p_add_pc_insn, 5471 s->contents + my_offset + 4); 5472 put_arm_insn (globals, output_bfd, (bfd_vma) a2t3p_bx_r12_insn, 5473 s->contents + my_offset + 8); 5474 /* Adjust the offset by 4 for the position of the add, 5475 and 8 for the pipeline offset. */ 5476 ret_offset = (val - (s->output_offset 5477 + s->output_section->vma 5478 + my_offset + 12)) 5479 | 1; 5480 bfd_put_32 (output_bfd, ret_offset, 5481 s->contents + my_offset + 12); 5482 } 5483 else if (globals->use_blx) 5484 { 5485 put_arm_insn (globals, output_bfd, (bfd_vma) a2t1v5_ldr_insn, 5486 s->contents + my_offset); 5487 5488 /* It's a thumb address. Add the low order bit. */ 5489 bfd_put_32 (output_bfd, val | a2t2v5_func_addr_insn, 5490 s->contents + my_offset + 4); 5491 } 5492 else 5493 { 5494 put_arm_insn (globals, output_bfd, (bfd_vma) a2t1_ldr_insn, 5495 s->contents + my_offset); 5496 5497 put_arm_insn (globals, output_bfd, (bfd_vma) a2t2_bx_r12_insn, 5498 s->contents + my_offset + 4); 5499 5500 /* It's a thumb address. Add the low order bit. */ 5501 bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, 5502 s->contents + my_offset + 8); 5503 5504 my_offset += 12; 5505 } 5506 } 5507 5508 BFD_ASSERT (my_offset <= globals->arm_glue_size); 5509 5510 return myh; 5511 } 5512 5513 /* Arm code calling a Thumb function. */ 5514 5515 static int 5516 elf32_arm_to_thumb_stub (struct bfd_link_info * info, 5517 const char * name, 5518 bfd * input_bfd, 5519 bfd * output_bfd, 5520 asection * input_section, 5521 bfd_byte * hit_data, 5522 asection * sym_sec, 5523 bfd_vma offset, 5524 bfd_signed_vma addend, 5525 bfd_vma val, 5526 char **error_message) 5527 { 5528 unsigned long int tmp; 5529 bfd_vma my_offset; 5530 asection * s; 5531 long int ret_offset; 5532 struct elf_link_hash_entry * myh; 5533 struct elf32_arm_link_hash_table * globals; 5534 5535 globals = elf32_arm_hash_table (info); 5536 5537 BFD_ASSERT (globals != NULL); 5538 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 5539 5540 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 5541 ARM2THUMB_GLUE_SECTION_NAME); 5542 BFD_ASSERT (s != NULL); 5543 BFD_ASSERT (s->contents != NULL); 5544 BFD_ASSERT (s->output_section != NULL); 5545 5546 myh = elf32_arm_create_thumb_stub (info, name, input_bfd, output_bfd, 5547 sym_sec, val, s, error_message); 5548 if (!myh) 5549 return FALSE; 5550 5551 my_offset = myh->root.u.def.value; 5552 tmp = bfd_get_32 (input_bfd, hit_data); 5553 tmp = tmp & 0xFF000000; 5554 5555 /* Somehow these are both 4 too far, so subtract 8. */ 5556 ret_offset = (s->output_offset 5557 + my_offset 5558 + s->output_section->vma 5559 - (input_section->output_offset 5560 + input_section->output_section->vma 5561 + offset + addend) 5562 - 8); 5563 5564 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); 5565 5566 bfd_put_32 (output_bfd, (bfd_vma) tmp, hit_data - input_section->vma); 5567 5568 return TRUE; 5569 } 5570 5571 /* Populate Arm stub for an exported Thumb function. */ 5572 5573 static bfd_boolean 5574 elf32_arm_to_thumb_export_stub (struct elf_link_hash_entry *h, void * inf) 5575 { 5576 struct bfd_link_info * info = (struct bfd_link_info *) inf; 5577 asection * s; 5578 struct elf_link_hash_entry * myh; 5579 struct elf32_arm_link_hash_entry *eh; 5580 struct elf32_arm_link_hash_table * globals; 5581 asection *sec; 5582 bfd_vma val; 5583 char *error_message; 5584 5585 eh = elf32_arm_hash_entry (h); 5586 /* Allocate stubs for exported Thumb functions on v4t. */ 5587 if (eh->export_glue == NULL) 5588 return TRUE; 5589 5590 globals = elf32_arm_hash_table (info); 5591 5592 BFD_ASSERT (globals != NULL); 5593 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 5594 5595 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 5596 ARM2THUMB_GLUE_SECTION_NAME); 5597 BFD_ASSERT (s != NULL); 5598 BFD_ASSERT (s->contents != NULL); 5599 BFD_ASSERT (s->output_section != NULL); 5600 5601 sec = eh->export_glue->root.u.def.section; 5602 5603 BFD_ASSERT (sec->output_section != NULL); 5604 5605 val = eh->export_glue->root.u.def.value + sec->output_offset 5606 + sec->output_section->vma; 5607 5608 myh = elf32_arm_create_thumb_stub (info, h->root.root.string, 5609 h->root.u.def.section->owner, 5610 globals->obfd, sec, val, s, 5611 &error_message); 5612 BFD_ASSERT (myh); 5613 return TRUE; 5614 } 5615 5616 /* Populate ARMv4 BX veneers. Returns the absolute adress of the veneer. */ 5617 5618 static bfd_vma 5619 elf32_arm_bx_glue (struct bfd_link_info * info, int reg) 5620 { 5621 bfd_byte *p; 5622 bfd_vma glue_addr; 5623 asection *s; 5624 struct elf32_arm_link_hash_table *globals; 5625 5626 globals = elf32_arm_hash_table (info); 5627 5628 BFD_ASSERT (globals != NULL); 5629 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 5630 5631 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 5632 ARM_BX_GLUE_SECTION_NAME); 5633 BFD_ASSERT (s != NULL); 5634 BFD_ASSERT (s->contents != NULL); 5635 BFD_ASSERT (s->output_section != NULL); 5636 5637 BFD_ASSERT (globals->bx_glue_offset[reg] & 2); 5638 5639 glue_addr = globals->bx_glue_offset[reg] & ~(bfd_vma)3; 5640 5641 if ((globals->bx_glue_offset[reg] & 1) == 0) 5642 { 5643 p = s->contents + glue_addr; 5644 bfd_put_32 (globals->obfd, armbx1_tst_insn + (reg << 16), p); 5645 bfd_put_32 (globals->obfd, armbx2_moveq_insn + reg, p + 4); 5646 bfd_put_32 (globals->obfd, armbx3_bx_insn + reg, p + 8); 5647 globals->bx_glue_offset[reg] |= 1; 5648 } 5649 5650 return glue_addr + s->output_section->vma + s->output_offset; 5651 } 5652 5653 /* Generate Arm stubs for exported Thumb symbols. */ 5654 static void 5655 elf32_arm_begin_write_processing (bfd *abfd ATTRIBUTE_UNUSED, 5656 struct bfd_link_info *link_info) 5657 { 5658 struct elf32_arm_link_hash_table * globals; 5659 5660 if (link_info == NULL) 5661 /* Ignore this if we are not called by the ELF backend linker. */ 5662 return; 5663 5664 globals = elf32_arm_hash_table (link_info); 5665 /* If blx is available then exported Thumb symbols are OK and there is 5666 nothing to do. */ 5667 if (globals->use_blx) 5668 return; 5669 5670 elf_link_hash_traverse (&globals->root, elf32_arm_to_thumb_export_stub, 5671 link_info); 5672 } 5673 5674 /* Some relocations map to different relocations depending on the 5675 target. Return the real relocation. */ 5676 5677 static int 5678 arm_real_reloc_type (struct elf32_arm_link_hash_table * globals, 5679 int r_type) 5680 { 5681 switch (r_type) 5682 { 5683 case R_ARM_TARGET1: 5684 if (globals->target1_is_rel) 5685 return R_ARM_REL32; 5686 else 5687 return R_ARM_ABS32; 5688 5689 case R_ARM_TARGET2: 5690 return globals->target2_reloc; 5691 5692 default: 5693 return r_type; 5694 } 5695 } 5696 5697 /* Return the base VMA address which should be subtracted from real addresses 5698 when resolving @dtpoff relocation. 5699 This is PT_TLS segment p_vaddr. */ 5700 5701 static bfd_vma 5702 dtpoff_base (struct bfd_link_info *info) 5703 { 5704 /* If tls_sec is NULL, we should have signalled an error already. */ 5705 if (elf_hash_table (info)->tls_sec == NULL) 5706 return 0; 5707 return elf_hash_table (info)->tls_sec->vma; 5708 } 5709 5710 /* Return the relocation value for @tpoff relocation 5711 if STT_TLS virtual address is ADDRESS. */ 5712 5713 static bfd_vma 5714 tpoff (struct bfd_link_info *info, bfd_vma address) 5715 { 5716 struct elf_link_hash_table *htab = elf_hash_table (info); 5717 bfd_vma base; 5718 5719 /* If tls_sec is NULL, we should have signalled an error already. */ 5720 if (htab->tls_sec == NULL) 5721 return 0; 5722 base = align_power ((bfd_vma) TCB_SIZE, htab->tls_sec->alignment_power); 5723 return address - htab->tls_sec->vma + base; 5724 } 5725 5726 /* Perform an R_ARM_ABS12 relocation on the field pointed to by DATA. 5727 VALUE is the relocation value. */ 5728 5729 static bfd_reloc_status_type 5730 elf32_arm_abs12_reloc (bfd *abfd, void *data, bfd_vma value) 5731 { 5732 if (value > 0xfff) 5733 return bfd_reloc_overflow; 5734 5735 value |= bfd_get_32 (abfd, data) & 0xfffff000; 5736 bfd_put_32 (abfd, value, data); 5737 return bfd_reloc_ok; 5738 } 5739 5740 /* For a given value of n, calculate the value of G_n as required to 5741 deal with group relocations. We return it in the form of an 5742 encoded constant-and-rotation, together with the final residual. If n is 5743 specified as less than zero, then final_residual is filled with the 5744 input value and no further action is performed. */ 5745 5746 static bfd_vma 5747 calculate_group_reloc_mask (bfd_vma value, int n, bfd_vma *final_residual) 5748 { 5749 int current_n; 5750 bfd_vma g_n; 5751 bfd_vma encoded_g_n = 0; 5752 bfd_vma residual = value; /* Also known as Y_n. */ 5753 5754 for (current_n = 0; current_n <= n; current_n++) 5755 { 5756 int shift; 5757 5758 /* Calculate which part of the value to mask. */ 5759 if (residual == 0) 5760 shift = 0; 5761 else 5762 { 5763 int msb; 5764 5765 /* Determine the most significant bit in the residual and 5766 align the resulting value to a 2-bit boundary. */ 5767 for (msb = 30; msb >= 0; msb -= 2) 5768 if (residual & (3 << msb)) 5769 break; 5770 5771 /* The desired shift is now (msb - 6), or zero, whichever 5772 is the greater. */ 5773 shift = msb - 6; 5774 if (shift < 0) 5775 shift = 0; 5776 } 5777 5778 /* Calculate g_n in 32-bit as well as encoded constant+rotation form. */ 5779 g_n = residual & (0xff << shift); 5780 encoded_g_n = (g_n >> shift) 5781 | ((g_n <= 0xff ? 0 : (32 - shift) / 2) << 8); 5782 5783 /* Calculate the residual for the next time around. */ 5784 residual &= ~g_n; 5785 } 5786 5787 *final_residual = residual; 5788 5789 return encoded_g_n; 5790 } 5791 5792 /* Given an ARM instruction, determine whether it is an ADD or a SUB. 5793 Returns 1 if it is an ADD, -1 if it is a SUB, and 0 otherwise. */ 5794 5795 static int 5796 identify_add_or_sub (bfd_vma insn) 5797 { 5798 int opcode = insn & 0x1e00000; 5799 5800 if (opcode == 1 << 23) /* ADD */ 5801 return 1; 5802 5803 if (opcode == 1 << 22) /* SUB */ 5804 return -1; 5805 5806 return 0; 5807 } 5808 5809 /* Perform a relocation as part of a final link. */ 5810 5811 static bfd_reloc_status_type 5812 elf32_arm_final_link_relocate (reloc_howto_type * howto, 5813 bfd * input_bfd, 5814 bfd * output_bfd, 5815 asection * input_section, 5816 bfd_byte * contents, 5817 Elf_Internal_Rela * rel, 5818 bfd_vma value, 5819 struct bfd_link_info * info, 5820 asection * sym_sec, 5821 const char * sym_name, 5822 int sym_flags, 5823 struct elf_link_hash_entry * h, 5824 bfd_boolean * unresolved_reloc_p, 5825 char ** error_message) 5826 { 5827 unsigned long r_type = howto->type; 5828 unsigned long r_symndx; 5829 bfd_byte * hit_data = contents + rel->r_offset; 5830 bfd * dynobj = NULL; 5831 Elf_Internal_Shdr * symtab_hdr; 5832 struct elf_link_hash_entry ** sym_hashes; 5833 bfd_vma * local_got_offsets; 5834 asection * sgot = NULL; 5835 asection * splt = NULL; 5836 asection * sreloc = NULL; 5837 bfd_vma addend; 5838 bfd_signed_vma signed_addend; 5839 struct elf32_arm_link_hash_table * globals; 5840 5841 globals = elf32_arm_hash_table (info); 5842 5843 BFD_ASSERT (is_arm_elf (input_bfd)); 5844 5845 /* Some relocation types map to different relocations depending on the 5846 target. We pick the right one here. */ 5847 r_type = arm_real_reloc_type (globals, r_type); 5848 if (r_type != howto->type) 5849 howto = elf32_arm_howto_from_type (r_type); 5850 5851 /* If the start address has been set, then set the EF_ARM_HASENTRY 5852 flag. Setting this more than once is redundant, but the cost is 5853 not too high, and it keeps the code simple. 5854 5855 The test is done here, rather than somewhere else, because the 5856 start address is only set just before the final link commences. 5857 5858 Note - if the user deliberately sets a start address of 0, the 5859 flag will not be set. */ 5860 if (bfd_get_start_address (output_bfd) != 0) 5861 elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY; 5862 5863 dynobj = elf_hash_table (info)->dynobj; 5864 if (dynobj) 5865 { 5866 sgot = bfd_get_section_by_name (dynobj, ".got"); 5867 splt = bfd_get_section_by_name (dynobj, ".plt"); 5868 } 5869 symtab_hdr = & elf_symtab_hdr (input_bfd); 5870 sym_hashes = elf_sym_hashes (input_bfd); 5871 local_got_offsets = elf_local_got_offsets (input_bfd); 5872 r_symndx = ELF32_R_SYM (rel->r_info); 5873 5874 if (globals->use_rel) 5875 { 5876 addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; 5877 5878 if (addend & ((howto->src_mask + 1) >> 1)) 5879 { 5880 signed_addend = -1; 5881 signed_addend &= ~ howto->src_mask; 5882 signed_addend |= addend; 5883 } 5884 else 5885 signed_addend = addend; 5886 } 5887 else 5888 addend = signed_addend = rel->r_addend; 5889 5890 switch (r_type) 5891 { 5892 case R_ARM_NONE: 5893 /* We don't need to find a value for this symbol. It's just a 5894 marker. */ 5895 *unresolved_reloc_p = FALSE; 5896 return bfd_reloc_ok; 5897 5898 case R_ARM_ABS12: 5899 if (!globals->vxworks_p) 5900 return elf32_arm_abs12_reloc (input_bfd, hit_data, value + addend); 5901 5902 case R_ARM_PC24: 5903 case R_ARM_ABS32: 5904 case R_ARM_ABS32_NOI: 5905 case R_ARM_REL32: 5906 case R_ARM_REL32_NOI: 5907 case R_ARM_CALL: 5908 case R_ARM_JUMP24: 5909 case R_ARM_XPC25: 5910 case R_ARM_PREL31: 5911 case R_ARM_PLT32: 5912 /* Handle relocations which should use the PLT entry. ABS32/REL32 5913 will use the symbol's value, which may point to a PLT entry, but we 5914 don't need to handle that here. If we created a PLT entry, all 5915 branches in this object should go to it. */ 5916 if ((r_type != R_ARM_ABS32 && r_type != R_ARM_REL32 5917 && r_type != R_ARM_ABS32_NOI && r_type != R_ARM_REL32_NOI) 5918 && h != NULL 5919 && splt != NULL 5920 && h->plt.offset != (bfd_vma) -1) 5921 { 5922 /* If we've created a .plt section, and assigned a PLT entry to 5923 this function, it should not be known to bind locally. If 5924 it were, we would have cleared the PLT entry. */ 5925 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h)); 5926 5927 value = (splt->output_section->vma 5928 + splt->output_offset 5929 + h->plt.offset); 5930 *unresolved_reloc_p = FALSE; 5931 return _bfd_final_link_relocate (howto, input_bfd, input_section, 5932 contents, rel->r_offset, value, 5933 rel->r_addend); 5934 } 5935 5936 /* When generating a shared object or relocatable executable, these 5937 relocations are copied into the output file to be resolved at 5938 run time. */ 5939 if ((info->shared || globals->root.is_relocatable_executable) 5940 && (input_section->flags & SEC_ALLOC) 5941 && !(elf32_arm_hash_table (info)->vxworks_p 5942 && strcmp (input_section->output_section->name, 5943 ".tls_vars") == 0) 5944 && ((r_type != R_ARM_REL32 && r_type != R_ARM_REL32_NOI) 5945 || !SYMBOL_CALLS_LOCAL (info, h)) 5946 && (h == NULL 5947 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 5948 || h->root.type != bfd_link_hash_undefweak) 5949 && r_type != R_ARM_PC24 5950 && r_type != R_ARM_CALL 5951 && r_type != R_ARM_JUMP24 5952 && r_type != R_ARM_PREL31 5953 && r_type != R_ARM_PLT32) 5954 { 5955 Elf_Internal_Rela outrel; 5956 bfd_byte *loc; 5957 bfd_boolean skip, relocate; 5958 5959 *unresolved_reloc_p = FALSE; 5960 5961 if (sreloc == NULL) 5962 { 5963 const char * name; 5964 5965 name = (bfd_elf_string_from_elf_section 5966 (input_bfd, 5967 elf_elfheader (input_bfd)->e_shstrndx, 5968 elf_section_data (input_section)->rel_hdr.sh_name)); 5969 if (name == NULL) 5970 return bfd_reloc_notsupported; 5971 5972 BFD_ASSERT (reloc_section_p (globals, name, input_section)); 5973 5974 sreloc = bfd_get_section_by_name (dynobj, name); 5975 BFD_ASSERT (sreloc != NULL); 5976 } 5977 5978 skip = FALSE; 5979 relocate = FALSE; 5980 5981 outrel.r_addend = addend; 5982 outrel.r_offset = 5983 _bfd_elf_section_offset (output_bfd, info, input_section, 5984 rel->r_offset); 5985 if (outrel.r_offset == (bfd_vma) -1) 5986 skip = TRUE; 5987 else if (outrel.r_offset == (bfd_vma) -2) 5988 skip = TRUE, relocate = TRUE; 5989 outrel.r_offset += (input_section->output_section->vma 5990 + input_section->output_offset); 5991 5992 if (skip) 5993 memset (&outrel, 0, sizeof outrel); 5994 else if (h != NULL 5995 && h->dynindx != -1 5996 && (!info->shared 5997 || !info->symbolic 5998 || !h->def_regular)) 5999 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 6000 else 6001 { 6002 int symbol; 6003 6004 /* This symbol is local, or marked to become local. */ 6005 if (sym_flags == STT_ARM_TFUNC) 6006 value |= 1; 6007 if (globals->symbian_p) 6008 { 6009 asection *osec; 6010 6011 /* On Symbian OS, the data segment and text segement 6012 can be relocated independently. Therefore, we 6013 must indicate the segment to which this 6014 relocation is relative. The BPABI allows us to 6015 use any symbol in the right segment; we just use 6016 the section symbol as it is convenient. (We 6017 cannot use the symbol given by "h" directly as it 6018 will not appear in the dynamic symbol table.) 6019 6020 Note that the dynamic linker ignores the section 6021 symbol value, so we don't subtract osec->vma 6022 from the emitted reloc addend. */ 6023 if (sym_sec) 6024 osec = sym_sec->output_section; 6025 else 6026 osec = input_section->output_section; 6027 symbol = elf_section_data (osec)->dynindx; 6028 if (symbol == 0) 6029 { 6030 struct elf_link_hash_table *htab = elf_hash_table (info); 6031 6032 if ((osec->flags & SEC_READONLY) == 0 6033 && htab->data_index_section != NULL) 6034 osec = htab->data_index_section; 6035 else 6036 osec = htab->text_index_section; 6037 symbol = elf_section_data (osec)->dynindx; 6038 } 6039 BFD_ASSERT (symbol != 0); 6040 } 6041 else 6042 /* On SVR4-ish systems, the dynamic loader cannot 6043 relocate the text and data segments independently, 6044 so the symbol does not matter. */ 6045 symbol = 0; 6046 outrel.r_info = ELF32_R_INFO (symbol, R_ARM_RELATIVE); 6047 if (globals->use_rel) 6048 relocate = TRUE; 6049 else 6050 outrel.r_addend += value; 6051 } 6052 6053 loc = sreloc->contents; 6054 loc += sreloc->reloc_count++ * RELOC_SIZE (globals); 6055 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 6056 6057 /* If this reloc is against an external symbol, we do not want to 6058 fiddle with the addend. Otherwise, we need to include the symbol 6059 value so that it becomes an addend for the dynamic reloc. */ 6060 if (! relocate) 6061 return bfd_reloc_ok; 6062 6063 return _bfd_final_link_relocate (howto, input_bfd, input_section, 6064 contents, rel->r_offset, value, 6065 (bfd_vma) 0); 6066 } 6067 else switch (r_type) 6068 { 6069 case R_ARM_ABS12: 6070 return elf32_arm_abs12_reloc (input_bfd, hit_data, value + addend); 6071 6072 case R_ARM_XPC25: /* Arm BLX instruction. */ 6073 case R_ARM_CALL: 6074 case R_ARM_JUMP24: 6075 case R_ARM_PC24: /* Arm B/BL instruction. */ 6076 case R_ARM_PLT32: 6077 { 6078 bfd_vma from; 6079 bfd_signed_vma branch_offset; 6080 struct elf32_arm_stub_hash_entry *stub_entry = NULL; 6081 6082 from = (input_section->output_section->vma 6083 + input_section->output_offset 6084 + rel->r_offset); 6085 branch_offset = (bfd_signed_vma)(value - from); 6086 6087 if (r_type == R_ARM_XPC25) 6088 { 6089 /* Check for Arm calling Arm function. */ 6090 /* FIXME: Should we translate the instruction into a BL 6091 instruction instead ? */ 6092 if (sym_flags != STT_ARM_TFUNC) 6093 (*_bfd_error_handler) 6094 (_("\%B: Warning: Arm BLX instruction targets Arm function '%s'."), 6095 input_bfd, 6096 h ? h->root.root.string : "(local)"); 6097 } 6098 else if (r_type != R_ARM_CALL) 6099 { 6100 /* Check for Arm calling Thumb function. */ 6101 if (sym_flags == STT_ARM_TFUNC) 6102 { 6103 if (elf32_arm_to_thumb_stub (info, sym_name, input_bfd, 6104 output_bfd, input_section, 6105 hit_data, sym_sec, rel->r_offset, 6106 signed_addend, value, 6107 error_message)) 6108 return bfd_reloc_ok; 6109 else 6110 return bfd_reloc_dangerous; 6111 } 6112 } 6113 6114 /* Check if a stub has to be inserted because the 6115 destination is too far or we are changing mode. */ 6116 if (r_type == R_ARM_CALL) 6117 { 6118 if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET 6119 || branch_offset < ARM_MAX_BWD_BRANCH_OFFSET 6120 || sym_flags == STT_ARM_TFUNC) 6121 { 6122 /* The target is out of reach, so redirect the 6123 branch to the local stub for this function. */ 6124 6125 stub_entry = elf32_arm_get_stub_entry (input_section, 6126 sym_sec, h, 6127 rel, globals); 6128 if (stub_entry != NULL) 6129 value = (stub_entry->stub_offset 6130 + stub_entry->stub_sec->output_offset 6131 + stub_entry->stub_sec->output_section->vma); 6132 } 6133 } 6134 6135 /* The ARM ELF ABI says that this reloc is computed as: S - P + A 6136 where: 6137 S is the address of the symbol in the relocation. 6138 P is address of the instruction being relocated. 6139 A is the addend (extracted from the instruction) in bytes. 6140 6141 S is held in 'value'. 6142 P is the base address of the section containing the 6143 instruction plus the offset of the reloc into that 6144 section, ie: 6145 (input_section->output_section->vma + 6146 input_section->output_offset + 6147 rel->r_offset). 6148 A is the addend, converted into bytes, ie: 6149 (signed_addend * 4) 6150 6151 Note: None of these operations have knowledge of the pipeline 6152 size of the processor, thus it is up to the assembler to 6153 encode this information into the addend. */ 6154 value -= (input_section->output_section->vma 6155 + input_section->output_offset); 6156 value -= rel->r_offset; 6157 if (globals->use_rel) 6158 value += (signed_addend << howto->size); 6159 else 6160 /* RELA addends do not have to be adjusted by howto->size. */ 6161 value += signed_addend; 6162 6163 signed_addend = value; 6164 signed_addend >>= howto->rightshift; 6165 6166 /* A branch to an undefined weak symbol is turned into a jump to 6167 the next instruction. */ 6168 if (h && h->root.type == bfd_link_hash_undefweak) 6169 { 6170 value = (bfd_get_32 (input_bfd, hit_data) & 0xf0000000) 6171 | 0x0affffff; 6172 } 6173 else 6174 { 6175 /* Perform a signed range check. */ 6176 if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1)) 6177 || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1))) 6178 return bfd_reloc_overflow; 6179 6180 addend = (value & 2); 6181 6182 value = (signed_addend & howto->dst_mask) 6183 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); 6184 6185 /* Set the H bit in the BLX instruction. */ 6186 if (sym_flags == STT_ARM_TFUNC) 6187 { 6188 if (addend) 6189 value |= (1 << 24); 6190 else 6191 value &= ~(bfd_vma)(1 << 24); 6192 } 6193 if (r_type == R_ARM_CALL) 6194 { 6195 /* Select the correct instruction (BL or BLX). */ 6196 /* Only if we are not handling a BL to a stub. In this 6197 case, mode switching is performed by the stub. */ 6198 if (sym_flags == STT_ARM_TFUNC && !stub_entry) 6199 value |= (1 << 28); 6200 else 6201 { 6202 value &= ~(bfd_vma)(1 << 28); 6203 value |= (1 << 24); 6204 } 6205 } 6206 } 6207 } 6208 break; 6209 6210 case R_ARM_ABS32: 6211 value += addend; 6212 if (sym_flags == STT_ARM_TFUNC) 6213 value |= 1; 6214 break; 6215 6216 case R_ARM_ABS32_NOI: 6217 value += addend; 6218 break; 6219 6220 case R_ARM_REL32: 6221 value += addend; 6222 if (sym_flags == STT_ARM_TFUNC) 6223 value |= 1; 6224 value -= (input_section->output_section->vma 6225 + input_section->output_offset + rel->r_offset); 6226 break; 6227 6228 case R_ARM_REL32_NOI: 6229 value += addend; 6230 value -= (input_section->output_section->vma 6231 + input_section->output_offset + rel->r_offset); 6232 break; 6233 6234 case R_ARM_PREL31: 6235 value -= (input_section->output_section->vma 6236 + input_section->output_offset + rel->r_offset); 6237 value += signed_addend; 6238 if (! h || h->root.type != bfd_link_hash_undefweak) 6239 { 6240 /* Check for overflow. */ 6241 if ((value ^ (value >> 1)) & (1 << 30)) 6242 return bfd_reloc_overflow; 6243 } 6244 value &= 0x7fffffff; 6245 value |= (bfd_get_32 (input_bfd, hit_data) & 0x80000000); 6246 if (sym_flags == STT_ARM_TFUNC) 6247 value |= 1; 6248 break; 6249 } 6250 6251 bfd_put_32 (input_bfd, value, hit_data); 6252 return bfd_reloc_ok; 6253 6254 case R_ARM_ABS8: 6255 value += addend; 6256 if ((long) value > 0x7f || (long) value < -0x80) 6257 return bfd_reloc_overflow; 6258 6259 bfd_put_8 (input_bfd, value, hit_data); 6260 return bfd_reloc_ok; 6261 6262 case R_ARM_ABS16: 6263 value += addend; 6264 6265 if ((long) value > 0x7fff || (long) value < -0x8000) 6266 return bfd_reloc_overflow; 6267 6268 bfd_put_16 (input_bfd, value, hit_data); 6269 return bfd_reloc_ok; 6270 6271 case R_ARM_THM_ABS5: 6272 /* Support ldr and str instructions for the thumb. */ 6273 if (globals->use_rel) 6274 { 6275 /* Need to refetch addend. */ 6276 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; 6277 /* ??? Need to determine shift amount from operand size. */ 6278 addend >>= howto->rightshift; 6279 } 6280 value += addend; 6281 6282 /* ??? Isn't value unsigned? */ 6283 if ((long) value > 0x1f || (long) value < -0x10) 6284 return bfd_reloc_overflow; 6285 6286 /* ??? Value needs to be properly shifted into place first. */ 6287 value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; 6288 bfd_put_16 (input_bfd, value, hit_data); 6289 return bfd_reloc_ok; 6290 6291 case R_ARM_THM_ALU_PREL_11_0: 6292 /* Corresponds to: addw.w reg, pc, #offset (and similarly for subw). */ 6293 { 6294 bfd_vma insn; 6295 bfd_signed_vma relocation; 6296 6297 insn = (bfd_get_16 (input_bfd, hit_data) << 16) 6298 | bfd_get_16 (input_bfd, hit_data + 2); 6299 6300 if (globals->use_rel) 6301 { 6302 signed_addend = (insn & 0xff) | ((insn & 0x7000) >> 4) 6303 | ((insn & (1 << 26)) >> 15); 6304 if (insn & 0xf00000) 6305 signed_addend = -signed_addend; 6306 } 6307 6308 relocation = value + signed_addend; 6309 relocation -= (input_section->output_section->vma 6310 + input_section->output_offset 6311 + rel->r_offset); 6312 6313 value = abs (relocation); 6314 6315 if (value >= 0x1000) 6316 return bfd_reloc_overflow; 6317 6318 insn = (insn & 0xfb0f8f00) | (value & 0xff) 6319 | ((value & 0x700) << 4) 6320 | ((value & 0x800) << 15); 6321 if (relocation < 0) 6322 insn |= 0xa00000; 6323 6324 bfd_put_16 (input_bfd, insn >> 16, hit_data); 6325 bfd_put_16 (input_bfd, insn & 0xffff, hit_data + 2); 6326 6327 return bfd_reloc_ok; 6328 } 6329 6330 case R_ARM_THM_PC12: 6331 /* Corresponds to: ldr.w reg, [pc, #offset]. */ 6332 { 6333 bfd_vma insn; 6334 bfd_signed_vma relocation; 6335 6336 insn = (bfd_get_16 (input_bfd, hit_data) << 16) 6337 | bfd_get_16 (input_bfd, hit_data + 2); 6338 6339 if (globals->use_rel) 6340 { 6341 signed_addend = insn & 0xfff; 6342 if (!(insn & (1 << 23))) 6343 signed_addend = -signed_addend; 6344 } 6345 6346 relocation = value + signed_addend; 6347 relocation -= (input_section->output_section->vma 6348 + input_section->output_offset 6349 + rel->r_offset); 6350 6351 value = abs (relocation); 6352 6353 if (value >= 0x1000) 6354 return bfd_reloc_overflow; 6355 6356 insn = (insn & 0xff7ff000) | value; 6357 if (relocation >= 0) 6358 insn |= (1 << 23); 6359 6360 bfd_put_16 (input_bfd, insn >> 16, hit_data); 6361 bfd_put_16 (input_bfd, insn & 0xffff, hit_data + 2); 6362 6363 return bfd_reloc_ok; 6364 } 6365 6366 case R_ARM_THM_XPC22: 6367 case R_ARM_THM_CALL: 6368 case R_ARM_THM_JUMP24: 6369 /* Thumb BL (branch long instruction). */ 6370 { 6371 bfd_vma relocation; 6372 bfd_vma reloc_sign; 6373 bfd_boolean overflow = FALSE; 6374 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); 6375 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); 6376 bfd_signed_vma reloc_signed_max; 6377 bfd_signed_vma reloc_signed_min; 6378 bfd_vma check; 6379 bfd_signed_vma signed_check; 6380 int bitsize; 6381 int thumb2 = using_thumb2 (globals); 6382 6383 /* A branch to an undefined weak symbol is turned into a jump to 6384 the next instruction unless a PLT entry will be created. */ 6385 if (h && h->root.type == bfd_link_hash_undefweak 6386 && !(splt != NULL && h->plt.offset != (bfd_vma) -1)) 6387 { 6388 bfd_put_16 (input_bfd, 0xe000, hit_data); 6389 bfd_put_16 (input_bfd, 0xbf00, hit_data + 2); 6390 return bfd_reloc_ok; 6391 } 6392 6393 /* Fetch the addend. We use the Thumb-2 encoding (backwards compatible 6394 with Thumb-1) involving the J1 and J2 bits. */ 6395 if (globals->use_rel) 6396 { 6397 bfd_vma s = (upper_insn & (1 << 10)) >> 10; 6398 bfd_vma upper = upper_insn & 0x3ff; 6399 bfd_vma lower = lower_insn & 0x7ff; 6400 bfd_vma j1 = (lower_insn & (1 << 13)) >> 13; 6401 bfd_vma j2 = (lower_insn & (1 << 11)) >> 11; 6402 bfd_vma i1 = j1 ^ s ? 0 : 1; 6403 bfd_vma i2 = j2 ^ s ? 0 : 1; 6404 6405 addend = (i1 << 23) | (i2 << 22) | (upper << 12) | (lower << 1); 6406 /* Sign extend. */ 6407 addend = (addend | ((s ? 0 : 1) << 24)) - (1 << 24); 6408 6409 signed_addend = addend; 6410 } 6411 6412 if (r_type == R_ARM_THM_XPC22) 6413 { 6414 /* Check for Thumb to Thumb call. */ 6415 /* FIXME: Should we translate the instruction into a BL 6416 instruction instead ? */ 6417 if (sym_flags == STT_ARM_TFUNC) 6418 (*_bfd_error_handler) 6419 (_("%B: Warning: Thumb BLX instruction targets thumb function '%s'."), 6420 input_bfd, 6421 h ? h->root.root.string : "(local)"); 6422 } 6423 else 6424 { 6425 /* If it is not a call to Thumb, assume call to Arm. 6426 If it is a call relative to a section name, then it is not a 6427 function call at all, but rather a long jump. Calls through 6428 the PLT do not require stubs. */ 6429 if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION 6430 && (h == NULL || splt == NULL 6431 || h->plt.offset == (bfd_vma) -1)) 6432 { 6433 if (globals->use_blx && r_type == R_ARM_THM_CALL) 6434 { 6435 /* Convert BL to BLX. */ 6436 lower_insn = (lower_insn & ~0x1000) | 0x0800; 6437 } 6438 else if (r_type != R_ARM_THM_CALL) 6439 { 6440 if (elf32_thumb_to_arm_stub 6441 (info, sym_name, input_bfd, output_bfd, input_section, 6442 hit_data, sym_sec, rel->r_offset, signed_addend, value, 6443 error_message)) 6444 return bfd_reloc_ok; 6445 else 6446 return bfd_reloc_dangerous; 6447 } 6448 } 6449 else if (sym_flags == STT_ARM_TFUNC && globals->use_blx 6450 && r_type == R_ARM_THM_CALL) 6451 { 6452 /* Make sure this is a BL. */ 6453 lower_insn |= 0x1800; 6454 } 6455 } 6456 6457 /* Handle calls via the PLT. */ 6458 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1) 6459 { 6460 value = (splt->output_section->vma 6461 + splt->output_offset 6462 + h->plt.offset); 6463 if (globals->use_blx && r_type == R_ARM_THM_CALL) 6464 { 6465 /* If the Thumb BLX instruction is available, convert the 6466 BL to a BLX instruction to call the ARM-mode PLT entry. */ 6467 lower_insn = (lower_insn & ~0x1000) | 0x0800; 6468 } 6469 else 6470 /* Target the Thumb stub before the ARM PLT entry. */ 6471 value -= PLT_THUMB_STUB_SIZE; 6472 *unresolved_reloc_p = FALSE; 6473 } 6474 6475 if (r_type == R_ARM_THM_CALL) 6476 { 6477 /* Check if a stub has to be inserted because the destination 6478 is too far. */ 6479 bfd_vma from; 6480 bfd_signed_vma branch_offset; 6481 struct elf32_arm_stub_hash_entry *stub_entry = NULL; 6482 6483 from = (input_section->output_section->vma 6484 + input_section->output_offset 6485 + rel->r_offset); 6486 branch_offset = (bfd_signed_vma)(value - from); 6487 6488 if ((!thumb2 6489 && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET 6490 || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) 6491 || 6492 (thumb2 6493 && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET 6494 || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) 6495 || ((sym_flags != STT_ARM_TFUNC) && !globals->use_blx)) 6496 { 6497 /* The target is out of reach or we are changing modes, so 6498 redirect the branch to the local stub for this 6499 function. */ 6500 stub_entry = elf32_arm_get_stub_entry (input_section, 6501 sym_sec, h, 6502 rel, globals); 6503 if (stub_entry != NULL) 6504 value = (stub_entry->stub_offset 6505 + stub_entry->stub_sec->output_offset 6506 + stub_entry->stub_sec->output_section->vma); 6507 6508 /* If this call becomes a call to Arm, force BLX. */ 6509 if (globals->use_blx) 6510 { 6511 if ((stub_entry 6512 && !arm_stub_is_thumb (stub_entry->stub_type)) 6513 || (sym_flags != STT_ARM_TFUNC)) 6514 lower_insn = (lower_insn & ~0x1000) | 0x0800; 6515 } 6516 } 6517 } 6518 6519 relocation = value + signed_addend; 6520 6521 relocation -= (input_section->output_section->vma 6522 + input_section->output_offset 6523 + rel->r_offset); 6524 6525 check = relocation >> howto->rightshift; 6526 6527 /* If this is a signed value, the rightshift just dropped 6528 leading 1 bits (assuming twos complement). */ 6529 if ((bfd_signed_vma) relocation >= 0) 6530 signed_check = check; 6531 else 6532 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); 6533 6534 /* Calculate the permissable maximum and minimum values for 6535 this relocation according to whether we're relocating for 6536 Thumb-2 or not. */ 6537 bitsize = howto->bitsize; 6538 if (!thumb2) 6539 bitsize -= 2; 6540 reloc_signed_max = ((1 << (bitsize - 1)) - 1) >> howto->rightshift; 6541 reloc_signed_min = ~reloc_signed_max; 6542 6543 /* Assumes two's complement. */ 6544 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) 6545 overflow = TRUE; 6546 6547 if ((lower_insn & 0x5000) == 0x4000) 6548 /* For a BLX instruction, make sure that the relocation is rounded up 6549 to a word boundary. This follows the semantics of the instruction 6550 which specifies that bit 1 of the target address will come from bit 6551 1 of the base address. */ 6552 relocation = (relocation + 2) & ~ 3; 6553 6554 /* Put RELOCATION back into the insn. Assumes two's complement. 6555 We use the Thumb-2 encoding, which is safe even if dealing with 6556 a Thumb-1 instruction by virtue of our overflow check above. */ 6557 reloc_sign = (signed_check < 0) ? 1 : 0; 6558 upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) 6559 | ((relocation >> 12) & 0x3ff) 6560 | (reloc_sign << 10); 6561 lower_insn = (lower_insn & ~(bfd_vma) 0x2fff) 6562 | (((!((relocation >> 23) & 1)) ^ reloc_sign) << 13) 6563 | (((!((relocation >> 22) & 1)) ^ reloc_sign) << 11) 6564 | ((relocation >> 1) & 0x7ff); 6565 6566 /* Put the relocated value back in the object file: */ 6567 bfd_put_16 (input_bfd, upper_insn, hit_data); 6568 bfd_put_16 (input_bfd, lower_insn, hit_data + 2); 6569 6570 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); 6571 } 6572 break; 6573 6574 case R_ARM_THM_JUMP19: 6575 /* Thumb32 conditional branch instruction. */ 6576 { 6577 bfd_vma relocation; 6578 bfd_boolean overflow = FALSE; 6579 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); 6580 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); 6581 bfd_signed_vma reloc_signed_max = 0xffffe; 6582 bfd_signed_vma reloc_signed_min = -0x100000; 6583 bfd_signed_vma signed_check; 6584 6585 /* Need to refetch the addend, reconstruct the top three bits, 6586 and squish the two 11 bit pieces together. */ 6587 if (globals->use_rel) 6588 { 6589 bfd_vma S = (upper_insn & 0x0400) >> 10; 6590 bfd_vma upper = (upper_insn & 0x003f); 6591 bfd_vma J1 = (lower_insn & 0x2000) >> 13; 6592 bfd_vma J2 = (lower_insn & 0x0800) >> 11; 6593 bfd_vma lower = (lower_insn & 0x07ff); 6594 6595 upper |= J1 << 6; 6596 upper |= J2 << 7; 6597 upper |= (!S) << 8; 6598 upper -= 0x0100; /* Sign extend. */ 6599 6600 addend = (upper << 12) | (lower << 1); 6601 signed_addend = addend; 6602 } 6603 6604 /* Handle calls via the PLT. */ 6605 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1) 6606 { 6607 value = (splt->output_section->vma 6608 + splt->output_offset 6609 + h->plt.offset); 6610 /* Target the Thumb stub before the ARM PLT entry. */ 6611 value -= PLT_THUMB_STUB_SIZE; 6612 *unresolved_reloc_p = FALSE; 6613 } 6614 6615 /* ??? Should handle interworking? GCC might someday try to 6616 use this for tail calls. */ 6617 6618 relocation = value + signed_addend; 6619 relocation -= (input_section->output_section->vma 6620 + input_section->output_offset 6621 + rel->r_offset); 6622 signed_check = (bfd_signed_vma) relocation; 6623 6624 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) 6625 overflow = TRUE; 6626 6627 /* Put RELOCATION back into the insn. */ 6628 { 6629 bfd_vma S = (relocation & 0x00100000) >> 20; 6630 bfd_vma J2 = (relocation & 0x00080000) >> 19; 6631 bfd_vma J1 = (relocation & 0x00040000) >> 18; 6632 bfd_vma hi = (relocation & 0x0003f000) >> 12; 6633 bfd_vma lo = (relocation & 0x00000ffe) >> 1; 6634 6635 upper_insn = (upper_insn & 0xfbc0) | (S << 10) | hi; 6636 lower_insn = (lower_insn & 0xd000) | (J1 << 13) | (J2 << 11) | lo; 6637 } 6638 6639 /* Put the relocated value back in the object file: */ 6640 bfd_put_16 (input_bfd, upper_insn, hit_data); 6641 bfd_put_16 (input_bfd, lower_insn, hit_data + 2); 6642 6643 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); 6644 } 6645 6646 case R_ARM_THM_JUMP11: 6647 case R_ARM_THM_JUMP8: 6648 case R_ARM_THM_JUMP6: 6649 /* Thumb B (branch) instruction). */ 6650 { 6651 bfd_signed_vma relocation; 6652 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; 6653 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; 6654 bfd_signed_vma signed_check; 6655 6656 /* CZB cannot jump backward. */ 6657 if (r_type == R_ARM_THM_JUMP6) 6658 reloc_signed_min = 0; 6659 6660 if (globals->use_rel) 6661 { 6662 /* Need to refetch addend. */ 6663 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; 6664 if (addend & ((howto->src_mask + 1) >> 1)) 6665 { 6666 signed_addend = -1; 6667 signed_addend &= ~ howto->src_mask; 6668 signed_addend |= addend; 6669 } 6670 else 6671 signed_addend = addend; 6672 /* The value in the insn has been right shifted. We need to 6673 undo this, so that we can perform the address calculation 6674 in terms of bytes. */ 6675 signed_addend <<= howto->rightshift; 6676 } 6677 relocation = value + signed_addend; 6678 6679 relocation -= (input_section->output_section->vma 6680 + input_section->output_offset 6681 + rel->r_offset); 6682 6683 relocation >>= howto->rightshift; 6684 signed_check = relocation; 6685 6686 if (r_type == R_ARM_THM_JUMP6) 6687 relocation = ((relocation & 0x0020) << 4) | ((relocation & 0x001f) << 3); 6688 else 6689 relocation &= howto->dst_mask; 6690 relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask)); 6691 6692 bfd_put_16 (input_bfd, relocation, hit_data); 6693 6694 /* Assumes two's complement. */ 6695 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) 6696 return bfd_reloc_overflow; 6697 6698 return bfd_reloc_ok; 6699 } 6700 6701 case R_ARM_ALU_PCREL7_0: 6702 case R_ARM_ALU_PCREL15_8: 6703 case R_ARM_ALU_PCREL23_15: 6704 { 6705 bfd_vma insn; 6706 bfd_vma relocation; 6707 6708 insn = bfd_get_32 (input_bfd, hit_data); 6709 if (globals->use_rel) 6710 { 6711 /* Extract the addend. */ 6712 addend = (insn & 0xff) << ((insn & 0xf00) >> 7); 6713 signed_addend = addend; 6714 } 6715 relocation = value + signed_addend; 6716 6717 relocation -= (input_section->output_section->vma 6718 + input_section->output_offset 6719 + rel->r_offset); 6720 insn = (insn & ~0xfff) 6721 | ((howto->bitpos << 7) & 0xf00) 6722 | ((relocation >> howto->bitpos) & 0xff); 6723 bfd_put_32 (input_bfd, value, hit_data); 6724 } 6725 return bfd_reloc_ok; 6726 6727 case R_ARM_GNU_VTINHERIT: 6728 case R_ARM_GNU_VTENTRY: 6729 return bfd_reloc_ok; 6730 6731 case R_ARM_GOTOFF32: 6732 /* Relocation is relative to the start of the 6733 global offset table. */ 6734 6735 BFD_ASSERT (sgot != NULL); 6736 if (sgot == NULL) 6737 return bfd_reloc_notsupported; 6738 6739 /* If we are addressing a Thumb function, we need to adjust the 6740 address by one, so that attempts to call the function pointer will 6741 correctly interpret it as Thumb code. */ 6742 if (sym_flags == STT_ARM_TFUNC) 6743 value += 1; 6744 6745 /* Note that sgot->output_offset is not involved in this 6746 calculation. We always want the start of .got. If we 6747 define _GLOBAL_OFFSET_TABLE in a different way, as is 6748 permitted by the ABI, we might have to change this 6749 calculation. */ 6750 value -= sgot->output_section->vma; 6751 return _bfd_final_link_relocate (howto, input_bfd, input_section, 6752 contents, rel->r_offset, value, 6753 rel->r_addend); 6754 6755 case R_ARM_GOTPC: 6756 /* Use global offset table as symbol value. */ 6757 BFD_ASSERT (sgot != NULL); 6758 6759 if (sgot == NULL) 6760 return bfd_reloc_notsupported; 6761 6762 *unresolved_reloc_p = FALSE; 6763 value = sgot->output_section->vma; 6764 return _bfd_final_link_relocate (howto, input_bfd, input_section, 6765 contents, rel->r_offset, value, 6766 rel->r_addend); 6767 6768 case R_ARM_GOT32: 6769 case R_ARM_GOT_PREL: 6770 /* Relocation is to the entry for this symbol in the 6771 global offset table. */ 6772 if (sgot == NULL) 6773 return bfd_reloc_notsupported; 6774 6775 if (h != NULL) 6776 { 6777 bfd_vma off; 6778 bfd_boolean dyn; 6779 6780 off = h->got.offset; 6781 BFD_ASSERT (off != (bfd_vma) -1); 6782 dyn = globals->root.dynamic_sections_created; 6783 6784 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 6785 || (info->shared 6786 && SYMBOL_REFERENCES_LOCAL (info, h)) 6787 || (ELF_ST_VISIBILITY (h->other) 6788 && h->root.type == bfd_link_hash_undefweak)) 6789 { 6790 /* This is actually a static link, or it is a -Bsymbolic link 6791 and the symbol is defined locally. We must initialize this 6792 entry in the global offset table. Since the offset must 6793 always be a multiple of 4, we use the least significant bit 6794 to record whether we have initialized it already. 6795 6796 When doing a dynamic link, we create a .rel(a).got relocation 6797 entry to initialize the value. This is done in the 6798 finish_dynamic_symbol routine. */ 6799 if ((off & 1) != 0) 6800 off &= ~1; 6801 else 6802 { 6803 /* If we are addressing a Thumb function, we need to 6804 adjust the address by one, so that attempts to 6805 call the function pointer will correctly 6806 interpret it as Thumb code. */ 6807 if (sym_flags == STT_ARM_TFUNC) 6808 value |= 1; 6809 6810 bfd_put_32 (output_bfd, value, sgot->contents + off); 6811 h->got.offset |= 1; 6812 } 6813 } 6814 else 6815 *unresolved_reloc_p = FALSE; 6816 6817 value = sgot->output_offset + off; 6818 } 6819 else 6820 { 6821 bfd_vma off; 6822 6823 BFD_ASSERT (local_got_offsets != NULL && 6824 local_got_offsets[r_symndx] != (bfd_vma) -1); 6825 6826 off = local_got_offsets[r_symndx]; 6827 6828 /* The offset must always be a multiple of 4. We use the 6829 least significant bit to record whether we have already 6830 generated the necessary reloc. */ 6831 if ((off & 1) != 0) 6832 off &= ~1; 6833 else 6834 { 6835 /* If we are addressing a Thumb function, we need to 6836 adjust the address by one, so that attempts to 6837 call the function pointer will correctly 6838 interpret it as Thumb code. */ 6839 if (sym_flags == STT_ARM_TFUNC) 6840 value |= 1; 6841 6842 if (globals->use_rel) 6843 bfd_put_32 (output_bfd, value, sgot->contents + off); 6844 6845 if (info->shared) 6846 { 6847 asection * srelgot; 6848 Elf_Internal_Rela outrel; 6849 bfd_byte *loc; 6850 6851 srelgot = (bfd_get_section_by_name 6852 (dynobj, RELOC_SECTION (globals, ".got"))); 6853 BFD_ASSERT (srelgot != NULL); 6854 6855 outrel.r_addend = addend + value; 6856 outrel.r_offset = (sgot->output_section->vma 6857 + sgot->output_offset 6858 + off); 6859 outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); 6860 loc = srelgot->contents; 6861 loc += srelgot->reloc_count++ * RELOC_SIZE (globals); 6862 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 6863 } 6864 6865 local_got_offsets[r_symndx] |= 1; 6866 } 6867 6868 value = sgot->output_offset + off; 6869 } 6870 if (r_type != R_ARM_GOT32) 6871 value += sgot->output_section->vma; 6872 6873 return _bfd_final_link_relocate (howto, input_bfd, input_section, 6874 contents, rel->r_offset, value, 6875 rel->r_addend); 6876 6877 case R_ARM_TLS_LDO32: 6878 value = value - dtpoff_base (info); 6879 6880 return _bfd_final_link_relocate (howto, input_bfd, input_section, 6881 contents, rel->r_offset, value, 6882 rel->r_addend); 6883 6884 case R_ARM_TLS_LDM32: 6885 { 6886 bfd_vma off; 6887 6888 if (globals->sgot == NULL) 6889 abort (); 6890 6891 off = globals->tls_ldm_got.offset; 6892 6893 if ((off & 1) != 0) 6894 off &= ~1; 6895 else 6896 { 6897 /* If we don't know the module number, create a relocation 6898 for it. */ 6899 if (info->shared) 6900 { 6901 Elf_Internal_Rela outrel; 6902 bfd_byte *loc; 6903 6904 if (globals->srelgot == NULL) 6905 abort (); 6906 6907 outrel.r_addend = 0; 6908 outrel.r_offset = (globals->sgot->output_section->vma 6909 + globals->sgot->output_offset + off); 6910 outrel.r_info = ELF32_R_INFO (0, R_ARM_TLS_DTPMOD32); 6911 6912 if (globals->use_rel) 6913 bfd_put_32 (output_bfd, outrel.r_addend, 6914 globals->sgot->contents + off); 6915 6916 loc = globals->srelgot->contents; 6917 loc += globals->srelgot->reloc_count++ * RELOC_SIZE (globals); 6918 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 6919 } 6920 else 6921 bfd_put_32 (output_bfd, 1, globals->sgot->contents + off); 6922 6923 globals->tls_ldm_got.offset |= 1; 6924 } 6925 6926 value = globals->sgot->output_section->vma + globals->sgot->output_offset + off 6927 - (input_section->output_section->vma + input_section->output_offset + rel->r_offset); 6928 6929 return _bfd_final_link_relocate (howto, input_bfd, input_section, 6930 contents, rel->r_offset, value, 6931 rel->r_addend); 6932 } 6933 6934 case R_ARM_TLS_GD32: 6935 case R_ARM_TLS_IE32: 6936 { 6937 bfd_vma off; 6938 int indx; 6939 char tls_type; 6940 6941 if (globals->sgot == NULL) 6942 abort (); 6943 6944 indx = 0; 6945 if (h != NULL) 6946 { 6947 bfd_boolean dyn; 6948 dyn = globals->root.dynamic_sections_created; 6949 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 6950 && (!info->shared 6951 || !SYMBOL_REFERENCES_LOCAL (info, h))) 6952 { 6953 *unresolved_reloc_p = FALSE; 6954 indx = h->dynindx; 6955 } 6956 off = h->got.offset; 6957 tls_type = ((struct elf32_arm_link_hash_entry *) h)->tls_type; 6958 } 6959 else 6960 { 6961 if (local_got_offsets == NULL) 6962 abort (); 6963 off = local_got_offsets[r_symndx]; 6964 tls_type = elf32_arm_local_got_tls_type (input_bfd)[r_symndx]; 6965 } 6966 6967 if (tls_type == GOT_UNKNOWN) 6968 abort (); 6969 6970 if ((off & 1) != 0) 6971 off &= ~1; 6972 else 6973 { 6974 bfd_boolean need_relocs = FALSE; 6975 Elf_Internal_Rela outrel; 6976 bfd_byte *loc = NULL; 6977 int cur_off = off; 6978 6979 /* The GOT entries have not been initialized yet. Do it 6980 now, and emit any relocations. If both an IE GOT and a 6981 GD GOT are necessary, we emit the GD first. */ 6982 6983 if ((info->shared || indx != 0) 6984 && (h == NULL 6985 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 6986 || h->root.type != bfd_link_hash_undefweak)) 6987 { 6988 need_relocs = TRUE; 6989 if (globals->srelgot == NULL) 6990 abort (); 6991 loc = globals->srelgot->contents; 6992 loc += globals->srelgot->reloc_count * RELOC_SIZE (globals); 6993 } 6994 6995 if (tls_type & GOT_TLS_GD) 6996 { 6997 if (need_relocs) 6998 { 6999 outrel.r_addend = 0; 7000 outrel.r_offset = (globals->sgot->output_section->vma 7001 + globals->sgot->output_offset 7002 + cur_off); 7003 outrel.r_info = ELF32_R_INFO (indx, R_ARM_TLS_DTPMOD32); 7004 7005 if (globals->use_rel) 7006 bfd_put_32 (output_bfd, outrel.r_addend, 7007 globals->sgot->contents + cur_off); 7008 7009 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 7010 globals->srelgot->reloc_count++; 7011 loc += RELOC_SIZE (globals); 7012 7013 if (indx == 0) 7014 bfd_put_32 (output_bfd, value - dtpoff_base (info), 7015 globals->sgot->contents + cur_off + 4); 7016 else 7017 { 7018 outrel.r_addend = 0; 7019 outrel.r_info = ELF32_R_INFO (indx, 7020 R_ARM_TLS_DTPOFF32); 7021 outrel.r_offset += 4; 7022 7023 if (globals->use_rel) 7024 bfd_put_32 (output_bfd, outrel.r_addend, 7025 globals->sgot->contents + cur_off + 4); 7026 7027 7028 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 7029 globals->srelgot->reloc_count++; 7030 loc += RELOC_SIZE (globals); 7031 } 7032 } 7033 else 7034 { 7035 /* If we are not emitting relocations for a 7036 general dynamic reference, then we must be in a 7037 static link or an executable link with the 7038 symbol binding locally. Mark it as belonging 7039 to module 1, the executable. */ 7040 bfd_put_32 (output_bfd, 1, 7041 globals->sgot->contents + cur_off); 7042 bfd_put_32 (output_bfd, value - dtpoff_base (info), 7043 globals->sgot->contents + cur_off + 4); 7044 } 7045 7046 cur_off += 8; 7047 } 7048 7049 if (tls_type & GOT_TLS_IE) 7050 { 7051 if (need_relocs) 7052 { 7053 if (indx == 0) 7054 outrel.r_addend = value - dtpoff_base (info); 7055 else 7056 outrel.r_addend = 0; 7057 outrel.r_offset = (globals->sgot->output_section->vma 7058 + globals->sgot->output_offset 7059 + cur_off); 7060 outrel.r_info = ELF32_R_INFO (indx, R_ARM_TLS_TPOFF32); 7061 7062 if (globals->use_rel) 7063 bfd_put_32 (output_bfd, outrel.r_addend, 7064 globals->sgot->contents + cur_off); 7065 7066 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 7067 globals->srelgot->reloc_count++; 7068 loc += RELOC_SIZE (globals); 7069 } 7070 else 7071 bfd_put_32 (output_bfd, tpoff (info, value), 7072 globals->sgot->contents + cur_off); 7073 cur_off += 4; 7074 } 7075 7076 if (h != NULL) 7077 h->got.offset |= 1; 7078 else 7079 local_got_offsets[r_symndx] |= 1; 7080 } 7081 7082 if ((tls_type & GOT_TLS_GD) && r_type != R_ARM_TLS_GD32) 7083 off += 8; 7084 value = globals->sgot->output_section->vma + globals->sgot->output_offset + off 7085 - (input_section->output_section->vma + input_section->output_offset + rel->r_offset); 7086 7087 return _bfd_final_link_relocate (howto, input_bfd, input_section, 7088 contents, rel->r_offset, value, 7089 rel->r_addend); 7090 } 7091 7092 case R_ARM_TLS_LE32: 7093 if (info->shared) 7094 { 7095 (*_bfd_error_handler) 7096 (_("%B(%A+0x%lx): R_ARM_TLS_LE32 relocation not permitted in shared object"), 7097 input_bfd, input_section, 7098 (long) rel->r_offset, howto->name); 7099 return FALSE; 7100 } 7101 else 7102 value = tpoff (info, value); 7103 7104 return _bfd_final_link_relocate (howto, input_bfd, input_section, 7105 contents, rel->r_offset, value, 7106 rel->r_addend); 7107 7108 case R_ARM_V4BX: 7109 if (globals->fix_v4bx) 7110 { 7111 bfd_vma insn = bfd_get_32 (input_bfd, hit_data); 7112 7113 /* Ensure that we have a BX instruction. */ 7114 BFD_ASSERT ((insn & 0x0ffffff0) == 0x012fff10); 7115 7116 if (globals->fix_v4bx == 2 && (insn & 0xf) != 0xf) 7117 { 7118 /* Branch to veneer. */ 7119 bfd_vma glue_addr; 7120 glue_addr = elf32_arm_bx_glue (info, insn & 0xf); 7121 glue_addr -= input_section->output_section->vma 7122 + input_section->output_offset 7123 + rel->r_offset + 8; 7124 insn = (insn & 0xf0000000) | 0x0a000000 7125 | ((glue_addr >> 2) & 0x00ffffff); 7126 } 7127 else 7128 { 7129 /* Preserve Rm (lowest four bits) and the condition code 7130 (highest four bits). Other bits encode MOV PC,Rm. */ 7131 insn = (insn & 0xf000000f) | 0x01a0f000; 7132 } 7133 7134 bfd_put_32 (input_bfd, insn, hit_data); 7135 } 7136 return bfd_reloc_ok; 7137 7138 case R_ARM_MOVW_ABS_NC: 7139 case R_ARM_MOVT_ABS: 7140 case R_ARM_MOVW_PREL_NC: 7141 case R_ARM_MOVT_PREL: 7142 /* Until we properly support segment-base-relative addressing then 7143 we assume the segment base to be zero, as for the group relocations. 7144 Thus R_ARM_MOVW_BREL_NC has the same semantics as R_ARM_MOVW_ABS_NC 7145 and R_ARM_MOVT_BREL has the same semantics as R_ARM_MOVT_ABS. */ 7146 case R_ARM_MOVW_BREL_NC: 7147 case R_ARM_MOVW_BREL: 7148 case R_ARM_MOVT_BREL: 7149 { 7150 bfd_vma insn = bfd_get_32 (input_bfd, hit_data); 7151 7152 if (globals->use_rel) 7153 { 7154 addend = ((insn >> 4) & 0xf000) | (insn & 0xfff); 7155 signed_addend = (addend ^ 0x8000) - 0x8000; 7156 } 7157 7158 value += signed_addend; 7159 7160 if (r_type == R_ARM_MOVW_PREL_NC || r_type == R_ARM_MOVT_PREL) 7161 value -= (input_section->output_section->vma 7162 + input_section->output_offset + rel->r_offset); 7163 7164 if (r_type == R_ARM_MOVW_BREL && value >= 0x10000) 7165 return bfd_reloc_overflow; 7166 7167 if (sym_flags == STT_ARM_TFUNC) 7168 value |= 1; 7169 7170 if (r_type == R_ARM_MOVT_ABS || r_type == R_ARM_MOVT_PREL 7171 || r_type == R_ARM_MOVT_BREL) 7172 value >>= 16; 7173 7174 insn &= 0xfff0f000; 7175 insn |= value & 0xfff; 7176 insn |= (value & 0xf000) << 4; 7177 bfd_put_32 (input_bfd, insn, hit_data); 7178 } 7179 return bfd_reloc_ok; 7180 7181 case R_ARM_THM_MOVW_ABS_NC: 7182 case R_ARM_THM_MOVT_ABS: 7183 case R_ARM_THM_MOVW_PREL_NC: 7184 case R_ARM_THM_MOVT_PREL: 7185 /* Until we properly support segment-base-relative addressing then 7186 we assume the segment base to be zero, as for the above relocations. 7187 Thus R_ARM_THM_MOVW_BREL_NC has the same semantics as 7188 R_ARM_THM_MOVW_ABS_NC and R_ARM_THM_MOVT_BREL has the same semantics 7189 as R_ARM_THM_MOVT_ABS. */ 7190 case R_ARM_THM_MOVW_BREL_NC: 7191 case R_ARM_THM_MOVW_BREL: 7192 case R_ARM_THM_MOVT_BREL: 7193 { 7194 bfd_vma insn; 7195 7196 insn = bfd_get_16 (input_bfd, hit_data) << 16; 7197 insn |= bfd_get_16 (input_bfd, hit_data + 2); 7198 7199 if (globals->use_rel) 7200 { 7201 addend = ((insn >> 4) & 0xf000) 7202 | ((insn >> 15) & 0x0800) 7203 | ((insn >> 4) & 0x0700) 7204 | (insn & 0x00ff); 7205 signed_addend = (addend ^ 0x8000) - 0x8000; 7206 } 7207 7208 value += signed_addend; 7209 7210 if (r_type == R_ARM_THM_MOVW_PREL_NC || r_type == R_ARM_THM_MOVT_PREL) 7211 value -= (input_section->output_section->vma 7212 + input_section->output_offset + rel->r_offset); 7213 7214 if (r_type == R_ARM_THM_MOVW_BREL && value >= 0x10000) 7215 return bfd_reloc_overflow; 7216 7217 if (sym_flags == STT_ARM_TFUNC) 7218 value |= 1; 7219 7220 if (r_type == R_ARM_THM_MOVT_ABS || r_type == R_ARM_THM_MOVT_PREL 7221 || r_type == R_ARM_THM_MOVT_BREL) 7222 value >>= 16; 7223 7224 insn &= 0xfbf08f00; 7225 insn |= (value & 0xf000) << 4; 7226 insn |= (value & 0x0800) << 15; 7227 insn |= (value & 0x0700) << 4; 7228 insn |= (value & 0x00ff); 7229 7230 bfd_put_16 (input_bfd, insn >> 16, hit_data); 7231 bfd_put_16 (input_bfd, insn & 0xffff, hit_data + 2); 7232 } 7233 return bfd_reloc_ok; 7234 7235 case R_ARM_ALU_PC_G0_NC: 7236 case R_ARM_ALU_PC_G1_NC: 7237 case R_ARM_ALU_PC_G0: 7238 case R_ARM_ALU_PC_G1: 7239 case R_ARM_ALU_PC_G2: 7240 case R_ARM_ALU_SB_G0_NC: 7241 case R_ARM_ALU_SB_G1_NC: 7242 case R_ARM_ALU_SB_G0: 7243 case R_ARM_ALU_SB_G1: 7244 case R_ARM_ALU_SB_G2: 7245 { 7246 bfd_vma insn = bfd_get_32 (input_bfd, hit_data); 7247 bfd_vma pc = input_section->output_section->vma 7248 + input_section->output_offset + rel->r_offset; 7249 /* sb should be the origin of the *segment* containing the symbol. 7250 It is not clear how to obtain this OS-dependent value, so we 7251 make an arbitrary choice of zero. */ 7252 bfd_vma sb = 0; 7253 bfd_vma residual; 7254 bfd_vma g_n; 7255 bfd_signed_vma signed_value; 7256 int group = 0; 7257 7258 /* Determine which group of bits to select. */ 7259 switch (r_type) 7260 { 7261 case R_ARM_ALU_PC_G0_NC: 7262 case R_ARM_ALU_PC_G0: 7263 case R_ARM_ALU_SB_G0_NC: 7264 case R_ARM_ALU_SB_G0: 7265 group = 0; 7266 break; 7267 7268 case R_ARM_ALU_PC_G1_NC: 7269 case R_ARM_ALU_PC_G1: 7270 case R_ARM_ALU_SB_G1_NC: 7271 case R_ARM_ALU_SB_G1: 7272 group = 1; 7273 break; 7274 7275 case R_ARM_ALU_PC_G2: 7276 case R_ARM_ALU_SB_G2: 7277 group = 2; 7278 break; 7279 7280 default: 7281 abort (); 7282 } 7283 7284 /* If REL, extract the addend from the insn. If RELA, it will 7285 have already been fetched for us. */ 7286 if (globals->use_rel) 7287 { 7288 int negative; 7289 bfd_vma constant = insn & 0xff; 7290 bfd_vma rotation = (insn & 0xf00) >> 8; 7291 7292 if (rotation == 0) 7293 signed_addend = constant; 7294 else 7295 { 7296 /* Compensate for the fact that in the instruction, the 7297 rotation is stored in multiples of 2 bits. */ 7298 rotation *= 2; 7299 7300 /* Rotate "constant" right by "rotation" bits. */ 7301 signed_addend = (constant >> rotation) | 7302 (constant << (8 * sizeof (bfd_vma) - rotation)); 7303 } 7304 7305 /* Determine if the instruction is an ADD or a SUB. 7306 (For REL, this determines the sign of the addend.) */ 7307 negative = identify_add_or_sub (insn); 7308 if (negative == 0) 7309 { 7310 (*_bfd_error_handler) 7311 (_("%B(%A+0x%lx): Only ADD or SUB instructions are allowed for ALU group relocations"), 7312 input_bfd, input_section, 7313 (long) rel->r_offset, howto->name); 7314 return bfd_reloc_overflow; 7315 } 7316 7317 signed_addend *= negative; 7318 } 7319 7320 /* Compute the value (X) to go in the place. */ 7321 if (r_type == R_ARM_ALU_PC_G0_NC 7322 || r_type == R_ARM_ALU_PC_G1_NC 7323 || r_type == R_ARM_ALU_PC_G0 7324 || r_type == R_ARM_ALU_PC_G1 7325 || r_type == R_ARM_ALU_PC_G2) 7326 /* PC relative. */ 7327 signed_value = value - pc + signed_addend; 7328 else 7329 /* Section base relative. */ 7330 signed_value = value - sb + signed_addend; 7331 7332 /* If the target symbol is a Thumb function, then set the 7333 Thumb bit in the address. */ 7334 if (sym_flags == STT_ARM_TFUNC) 7335 signed_value |= 1; 7336 7337 /* Calculate the value of the relevant G_n, in encoded 7338 constant-with-rotation format. */ 7339 g_n = calculate_group_reloc_mask (abs (signed_value), group, 7340 &residual); 7341 7342 /* Check for overflow if required. */ 7343 if ((r_type == R_ARM_ALU_PC_G0 7344 || r_type == R_ARM_ALU_PC_G1 7345 || r_type == R_ARM_ALU_PC_G2 7346 || r_type == R_ARM_ALU_SB_G0 7347 || r_type == R_ARM_ALU_SB_G1 7348 || r_type == R_ARM_ALU_SB_G2) && residual != 0) 7349 { 7350 (*_bfd_error_handler) 7351 (_("%B(%A+0x%lx): Overflow whilst splitting 0x%lx for group relocation %s"), 7352 input_bfd, input_section, 7353 (long) rel->r_offset, abs (signed_value), howto->name); 7354 return bfd_reloc_overflow; 7355 } 7356 7357 /* Mask out the value and the ADD/SUB part of the opcode; take care 7358 not to destroy the S bit. */ 7359 insn &= 0xff1ff000; 7360 7361 /* Set the opcode according to whether the value to go in the 7362 place is negative. */ 7363 if (signed_value < 0) 7364 insn |= 1 << 22; 7365 else 7366 insn |= 1 << 23; 7367 7368 /* Encode the offset. */ 7369 insn |= g_n; 7370 7371 bfd_put_32 (input_bfd, insn, hit_data); 7372 } 7373 return bfd_reloc_ok; 7374 7375 case R_ARM_LDR_PC_G0: 7376 case R_ARM_LDR_PC_G1: 7377 case R_ARM_LDR_PC_G2: 7378 case R_ARM_LDR_SB_G0: 7379 case R_ARM_LDR_SB_G1: 7380 case R_ARM_LDR_SB_G2: 7381 { 7382 bfd_vma insn = bfd_get_32 (input_bfd, hit_data); 7383 bfd_vma pc = input_section->output_section->vma 7384 + input_section->output_offset + rel->r_offset; 7385 bfd_vma sb = 0; /* See note above. */ 7386 bfd_vma residual; 7387 bfd_signed_vma signed_value; 7388 int group = 0; 7389 7390 /* Determine which groups of bits to calculate. */ 7391 switch (r_type) 7392 { 7393 case R_ARM_LDR_PC_G0: 7394 case R_ARM_LDR_SB_G0: 7395 group = 0; 7396 break; 7397 7398 case R_ARM_LDR_PC_G1: 7399 case R_ARM_LDR_SB_G1: 7400 group = 1; 7401 break; 7402 7403 case R_ARM_LDR_PC_G2: 7404 case R_ARM_LDR_SB_G2: 7405 group = 2; 7406 break; 7407 7408 default: 7409 abort (); 7410 } 7411 7412 /* If REL, extract the addend from the insn. If RELA, it will 7413 have already been fetched for us. */ 7414 if (globals->use_rel) 7415 { 7416 int negative = (insn & (1 << 23)) ? 1 : -1; 7417 signed_addend = negative * (insn & 0xfff); 7418 } 7419 7420 /* Compute the value (X) to go in the place. */ 7421 if (r_type == R_ARM_LDR_PC_G0 7422 || r_type == R_ARM_LDR_PC_G1 7423 || r_type == R_ARM_LDR_PC_G2) 7424 /* PC relative. */ 7425 signed_value = value - pc + signed_addend; 7426 else 7427 /* Section base relative. */ 7428 signed_value = value - sb + signed_addend; 7429 7430 /* Calculate the value of the relevant G_{n-1} to obtain 7431 the residual at that stage. */ 7432 calculate_group_reloc_mask (abs (signed_value), group - 1, &residual); 7433 7434 /* Check for overflow. */ 7435 if (residual >= 0x1000) 7436 { 7437 (*_bfd_error_handler) 7438 (_("%B(%A+0x%lx): Overflow whilst splitting 0x%lx for group relocation %s"), 7439 input_bfd, input_section, 7440 (long) rel->r_offset, abs (signed_value), howto->name); 7441 return bfd_reloc_overflow; 7442 } 7443 7444 /* Mask out the value and U bit. */ 7445 insn &= 0xff7ff000; 7446 7447 /* Set the U bit if the value to go in the place is non-negative. */ 7448 if (signed_value >= 0) 7449 insn |= 1 << 23; 7450 7451 /* Encode the offset. */ 7452 insn |= residual; 7453 7454 bfd_put_32 (input_bfd, insn, hit_data); 7455 } 7456 return bfd_reloc_ok; 7457 7458 case R_ARM_LDRS_PC_G0: 7459 case R_ARM_LDRS_PC_G1: 7460 case R_ARM_LDRS_PC_G2: 7461 case R_ARM_LDRS_SB_G0: 7462 case R_ARM_LDRS_SB_G1: 7463 case R_ARM_LDRS_SB_G2: 7464 { 7465 bfd_vma insn = bfd_get_32 (input_bfd, hit_data); 7466 bfd_vma pc = input_section->output_section->vma 7467 + input_section->output_offset + rel->r_offset; 7468 bfd_vma sb = 0; /* See note above. */ 7469 bfd_vma residual; 7470 bfd_signed_vma signed_value; 7471 int group = 0; 7472 7473 /* Determine which groups of bits to calculate. */ 7474 switch (r_type) 7475 { 7476 case R_ARM_LDRS_PC_G0: 7477 case R_ARM_LDRS_SB_G0: 7478 group = 0; 7479 break; 7480 7481 case R_ARM_LDRS_PC_G1: 7482 case R_ARM_LDRS_SB_G1: 7483 group = 1; 7484 break; 7485 7486 case R_ARM_LDRS_PC_G2: 7487 case R_ARM_LDRS_SB_G2: 7488 group = 2; 7489 break; 7490 7491 default: 7492 abort (); 7493 } 7494 7495 /* If REL, extract the addend from the insn. If RELA, it will 7496 have already been fetched for us. */ 7497 if (globals->use_rel) 7498 { 7499 int negative = (insn & (1 << 23)) ? 1 : -1; 7500 signed_addend = negative * (((insn & 0xf00) >> 4) + (insn & 0xf)); 7501 } 7502 7503 /* Compute the value (X) to go in the place. */ 7504 if (r_type == R_ARM_LDRS_PC_G0 7505 || r_type == R_ARM_LDRS_PC_G1 7506 || r_type == R_ARM_LDRS_PC_G2) 7507 /* PC relative. */ 7508 signed_value = value - pc + signed_addend; 7509 else 7510 /* Section base relative. */ 7511 signed_value = value - sb + signed_addend; 7512 7513 /* Calculate the value of the relevant G_{n-1} to obtain 7514 the residual at that stage. */ 7515 calculate_group_reloc_mask (abs (signed_value), group - 1, &residual); 7516 7517 /* Check for overflow. */ 7518 if (residual >= 0x100) 7519 { 7520 (*_bfd_error_handler) 7521 (_("%B(%A+0x%lx): Overflow whilst splitting 0x%lx for group relocation %s"), 7522 input_bfd, input_section, 7523 (long) rel->r_offset, abs (signed_value), howto->name); 7524 return bfd_reloc_overflow; 7525 } 7526 7527 /* Mask out the value and U bit. */ 7528 insn &= 0xff7ff0f0; 7529 7530 /* Set the U bit if the value to go in the place is non-negative. */ 7531 if (signed_value >= 0) 7532 insn |= 1 << 23; 7533 7534 /* Encode the offset. */ 7535 insn |= ((residual & 0xf0) << 4) | (residual & 0xf); 7536 7537 bfd_put_32 (input_bfd, insn, hit_data); 7538 } 7539 return bfd_reloc_ok; 7540 7541 case R_ARM_LDC_PC_G0: 7542 case R_ARM_LDC_PC_G1: 7543 case R_ARM_LDC_PC_G2: 7544 case R_ARM_LDC_SB_G0: 7545 case R_ARM_LDC_SB_G1: 7546 case R_ARM_LDC_SB_G2: 7547 { 7548 bfd_vma insn = bfd_get_32 (input_bfd, hit_data); 7549 bfd_vma pc = input_section->output_section->vma 7550 + input_section->output_offset + rel->r_offset; 7551 bfd_vma sb = 0; /* See note above. */ 7552 bfd_vma residual; 7553 bfd_signed_vma signed_value; 7554 int group = 0; 7555 7556 /* Determine which groups of bits to calculate. */ 7557 switch (r_type) 7558 { 7559 case R_ARM_LDC_PC_G0: 7560 case R_ARM_LDC_SB_G0: 7561 group = 0; 7562 break; 7563 7564 case R_ARM_LDC_PC_G1: 7565 case R_ARM_LDC_SB_G1: 7566 group = 1; 7567 break; 7568 7569 case R_ARM_LDC_PC_G2: 7570 case R_ARM_LDC_SB_G2: 7571 group = 2; 7572 break; 7573 7574 default: 7575 abort (); 7576 } 7577 7578 /* If REL, extract the addend from the insn. If RELA, it will 7579 have already been fetched for us. */ 7580 if (globals->use_rel) 7581 { 7582 int negative = (insn & (1 << 23)) ? 1 : -1; 7583 signed_addend = negative * ((insn & 0xff) << 2); 7584 } 7585 7586 /* Compute the value (X) to go in the place. */ 7587 if (r_type == R_ARM_LDC_PC_G0 7588 || r_type == R_ARM_LDC_PC_G1 7589 || r_type == R_ARM_LDC_PC_G2) 7590 /* PC relative. */ 7591 signed_value = value - pc + signed_addend; 7592 else 7593 /* Section base relative. */ 7594 signed_value = value - sb + signed_addend; 7595 7596 /* Calculate the value of the relevant G_{n-1} to obtain 7597 the residual at that stage. */ 7598 calculate_group_reloc_mask (abs (signed_value), group - 1, &residual); 7599 7600 /* Check for overflow. (The absolute value to go in the place must be 7601 divisible by four and, after having been divided by four, must 7602 fit in eight bits.) */ 7603 if ((residual & 0x3) != 0 || residual >= 0x400) 7604 { 7605 (*_bfd_error_handler) 7606 (_("%B(%A+0x%lx): Overflow whilst splitting 0x%lx for group relocation %s"), 7607 input_bfd, input_section, 7608 (long) rel->r_offset, abs (signed_value), howto->name); 7609 return bfd_reloc_overflow; 7610 } 7611 7612 /* Mask out the value and U bit. */ 7613 insn &= 0xff7fff00; 7614 7615 /* Set the U bit if the value to go in the place is non-negative. */ 7616 if (signed_value >= 0) 7617 insn |= 1 << 23; 7618 7619 /* Encode the offset. */ 7620 insn |= residual >> 2; 7621 7622 bfd_put_32 (input_bfd, insn, hit_data); 7623 } 7624 return bfd_reloc_ok; 7625 7626 default: 7627 return bfd_reloc_notsupported; 7628 } 7629 } 7630 7631 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ 7632 static void 7633 arm_add_to_rel (bfd * abfd, 7634 bfd_byte * address, 7635 reloc_howto_type * howto, 7636 bfd_signed_vma increment) 7637 { 7638 bfd_signed_vma addend; 7639 7640 if (howto->type == R_ARM_THM_CALL 7641 || howto->type == R_ARM_THM_JUMP24) 7642 { 7643 int upper_insn, lower_insn; 7644 int upper, lower; 7645 7646 upper_insn = bfd_get_16 (abfd, address); 7647 lower_insn = bfd_get_16 (abfd, address + 2); 7648 upper = upper_insn & 0x7ff; 7649 lower = lower_insn & 0x7ff; 7650 7651 addend = (upper << 12) | (lower << 1); 7652 addend += increment; 7653 addend >>= 1; 7654 7655 upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); 7656 lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); 7657 7658 bfd_put_16 (abfd, (bfd_vma) upper_insn, address); 7659 bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2); 7660 } 7661 else 7662 { 7663 bfd_vma contents; 7664 7665 contents = bfd_get_32 (abfd, address); 7666 7667 /* Get the (signed) value from the instruction. */ 7668 addend = contents & howto->src_mask; 7669 if (addend & ((howto->src_mask + 1) >> 1)) 7670 { 7671 bfd_signed_vma mask; 7672 7673 mask = -1; 7674 mask &= ~ howto->src_mask; 7675 addend |= mask; 7676 } 7677 7678 /* Add in the increment, (which is a byte value). */ 7679 switch (howto->type) 7680 { 7681 default: 7682 addend += increment; 7683 break; 7684 7685 case R_ARM_PC24: 7686 case R_ARM_PLT32: 7687 case R_ARM_CALL: 7688 case R_ARM_JUMP24: 7689 addend <<= howto->size; 7690 addend += increment; 7691 7692 /* Should we check for overflow here ? */ 7693 7694 /* Drop any undesired bits. */ 7695 addend >>= howto->rightshift; 7696 break; 7697 } 7698 7699 contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); 7700 7701 bfd_put_32 (abfd, contents, address); 7702 } 7703 } 7704 7705 #define IS_ARM_TLS_RELOC(R_TYPE) \ 7706 ((R_TYPE) == R_ARM_TLS_GD32 \ 7707 || (R_TYPE) == R_ARM_TLS_LDO32 \ 7708 || (R_TYPE) == R_ARM_TLS_LDM32 \ 7709 || (R_TYPE) == R_ARM_TLS_DTPOFF32 \ 7710 || (R_TYPE) == R_ARM_TLS_DTPMOD32 \ 7711 || (R_TYPE) == R_ARM_TLS_TPOFF32 \ 7712 || (R_TYPE) == R_ARM_TLS_LE32 \ 7713 || (R_TYPE) == R_ARM_TLS_IE32) 7714 7715 /* Relocate an ARM ELF section. */ 7716 7717 static bfd_boolean 7718 elf32_arm_relocate_section (bfd * output_bfd, 7719 struct bfd_link_info * info, 7720 bfd * input_bfd, 7721 asection * input_section, 7722 bfd_byte * contents, 7723 Elf_Internal_Rela * relocs, 7724 Elf_Internal_Sym * local_syms, 7725 asection ** local_sections) 7726 { 7727 Elf_Internal_Shdr *symtab_hdr; 7728 struct elf_link_hash_entry **sym_hashes; 7729 Elf_Internal_Rela *rel; 7730 Elf_Internal_Rela *relend; 7731 const char *name; 7732 struct elf32_arm_link_hash_table * globals; 7733 7734 globals = elf32_arm_hash_table (info); 7735 7736 symtab_hdr = & elf_symtab_hdr (input_bfd); 7737 sym_hashes = elf_sym_hashes (input_bfd); 7738 7739 rel = relocs; 7740 relend = relocs + input_section->reloc_count; 7741 for (; rel < relend; rel++) 7742 { 7743 int r_type; 7744 reloc_howto_type * howto; 7745 unsigned long r_symndx; 7746 Elf_Internal_Sym * sym; 7747 asection * sec; 7748 struct elf_link_hash_entry * h; 7749 bfd_vma relocation; 7750 bfd_reloc_status_type r; 7751 arelent bfd_reloc; 7752 char sym_type; 7753 bfd_boolean unresolved_reloc = FALSE; 7754 char *error_message = NULL; 7755 7756 r_symndx = ELF32_R_SYM (rel->r_info); 7757 r_type = ELF32_R_TYPE (rel->r_info); 7758 r_type = arm_real_reloc_type (globals, r_type); 7759 7760 if ( r_type == R_ARM_GNU_VTENTRY 7761 || r_type == R_ARM_GNU_VTINHERIT) 7762 continue; 7763 7764 bfd_reloc.howto = elf32_arm_howto_from_type (r_type); 7765 howto = bfd_reloc.howto; 7766 7767 h = NULL; 7768 sym = NULL; 7769 sec = NULL; 7770 7771 if (r_symndx < symtab_hdr->sh_info) 7772 { 7773 sym = local_syms + r_symndx; 7774 sym_type = ELF32_ST_TYPE (sym->st_info); 7775 sec = local_sections[r_symndx]; 7776 if (globals->use_rel) 7777 { 7778 relocation = (sec->output_section->vma 7779 + sec->output_offset 7780 + sym->st_value); 7781 if (!info->relocatable 7782 && (sec->flags & SEC_MERGE) 7783 && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 7784 { 7785 asection *msec; 7786 bfd_vma addend, value; 7787 7788 switch (r_type) 7789 { 7790 case R_ARM_MOVW_ABS_NC: 7791 case R_ARM_MOVT_ABS: 7792 value = bfd_get_32 (input_bfd, contents + rel->r_offset); 7793 addend = ((value & 0xf0000) >> 4) | (value & 0xfff); 7794 addend = (addend ^ 0x8000) - 0x8000; 7795 break; 7796 7797 case R_ARM_THM_MOVW_ABS_NC: 7798 case R_ARM_THM_MOVT_ABS: 7799 value = bfd_get_16 (input_bfd, contents + rel->r_offset) 7800 << 16; 7801 value |= bfd_get_16 (input_bfd, 7802 contents + rel->r_offset + 2); 7803 addend = ((value & 0xf7000) >> 4) | (value & 0xff) 7804 | ((value & 0x04000000) >> 15); 7805 addend = (addend ^ 0x8000) - 0x8000; 7806 break; 7807 7808 default: 7809 if (howto->rightshift 7810 || (howto->src_mask & (howto->src_mask + 1))) 7811 { 7812 (*_bfd_error_handler) 7813 (_("%B(%A+0x%lx): %s relocation against SEC_MERGE section"), 7814 input_bfd, input_section, 7815 (long) rel->r_offset, howto->name); 7816 return FALSE; 7817 } 7818 7819 value = bfd_get_32 (input_bfd, contents + rel->r_offset); 7820 7821 /* Get the (signed) value from the instruction. */ 7822 addend = value & howto->src_mask; 7823 if (addend & ((howto->src_mask + 1) >> 1)) 7824 { 7825 bfd_signed_vma mask; 7826 7827 mask = -1; 7828 mask &= ~ howto->src_mask; 7829 addend |= mask; 7830 } 7831 break; 7832 } 7833 7834 msec = sec; 7835 addend = 7836 _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend) 7837 - relocation; 7838 addend += msec->output_section->vma + msec->output_offset; 7839 7840 /* Cases here must match those in the preceeding 7841 switch statement. */ 7842 switch (r_type) 7843 { 7844 case R_ARM_MOVW_ABS_NC: 7845 case R_ARM_MOVT_ABS: 7846 value = (value & 0xfff0f000) | ((addend & 0xf000) << 4) 7847 | (addend & 0xfff); 7848 bfd_put_32 (input_bfd, value, contents + rel->r_offset); 7849 break; 7850 7851 case R_ARM_THM_MOVW_ABS_NC: 7852 case R_ARM_THM_MOVT_ABS: 7853 value = (value & 0xfbf08f00) | ((addend & 0xf700) << 4) 7854 | (addend & 0xff) | ((addend & 0x0800) << 15); 7855 bfd_put_16 (input_bfd, value >> 16, 7856 contents + rel->r_offset); 7857 bfd_put_16 (input_bfd, value, 7858 contents + rel->r_offset + 2); 7859 break; 7860 7861 default: 7862 value = (value & ~ howto->dst_mask) 7863 | (addend & howto->dst_mask); 7864 bfd_put_32 (input_bfd, value, contents + rel->r_offset); 7865 break; 7866 } 7867 } 7868 } 7869 else 7870 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 7871 } 7872 else 7873 { 7874 bfd_boolean warned; 7875 7876 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 7877 r_symndx, symtab_hdr, sym_hashes, 7878 h, sec, relocation, 7879 unresolved_reloc, warned); 7880 7881 sym_type = h->type; 7882 } 7883 7884 if (sec != NULL && elf_discarded_section (sec)) 7885 { 7886 /* For relocs against symbols from removed linkonce sections, 7887 or sections discarded by a linker script, we just want the 7888 section contents zeroed. Avoid any special processing. */ 7889 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 7890 rel->r_info = 0; 7891 rel->r_addend = 0; 7892 continue; 7893 } 7894 7895 if (info->relocatable) 7896 { 7897 /* This is a relocatable link. We don't have to change 7898 anything, unless the reloc is against a section symbol, 7899 in which case we have to adjust according to where the 7900 section symbol winds up in the output section. */ 7901 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 7902 { 7903 if (globals->use_rel) 7904 arm_add_to_rel (input_bfd, contents + rel->r_offset, 7905 howto, (bfd_signed_vma) sec->output_offset); 7906 else 7907 rel->r_addend += sec->output_offset; 7908 } 7909 continue; 7910 } 7911 7912 if (h != NULL) 7913 name = h->root.root.string; 7914 else 7915 { 7916 name = (bfd_elf_string_from_elf_section 7917 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 7918 if (name == NULL || *name == '\0') 7919 name = bfd_section_name (input_bfd, sec); 7920 } 7921 7922 if (r_symndx != 0 7923 && r_type != R_ARM_NONE 7924 && (h == NULL 7925 || h->root.type == bfd_link_hash_defined 7926 || h->root.type == bfd_link_hash_defweak) 7927 && IS_ARM_TLS_RELOC (r_type) != (sym_type == STT_TLS)) 7928 { 7929 (*_bfd_error_handler) 7930 ((sym_type == STT_TLS 7931 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 7932 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), 7933 input_bfd, 7934 input_section, 7935 (long) rel->r_offset, 7936 howto->name, 7937 name); 7938 } 7939 7940 r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, 7941 input_section, contents, rel, 7942 relocation, info, sec, name, 7943 (h ? ELF_ST_TYPE (h->type) : 7944 ELF_ST_TYPE (sym->st_info)), h, 7945 &unresolved_reloc, &error_message); 7946 7947 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 7948 because such sections are not SEC_ALLOC and thus ld.so will 7949 not process them. */ 7950 if (unresolved_reloc 7951 && !((input_section->flags & SEC_DEBUGGING) != 0 7952 && h->def_dynamic)) 7953 { 7954 (*_bfd_error_handler) 7955 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 7956 input_bfd, 7957 input_section, 7958 (long) rel->r_offset, 7959 howto->name, 7960 h->root.root.string); 7961 return FALSE; 7962 } 7963 7964 if (r != bfd_reloc_ok) 7965 { 7966 switch (r) 7967 { 7968 case bfd_reloc_overflow: 7969 /* If the overflowing reloc was to an undefined symbol, 7970 we have already printed one error message and there 7971 is no point complaining again. */ 7972 if ((! h || 7973 h->root.type != bfd_link_hash_undefined) 7974 && (!((*info->callbacks->reloc_overflow) 7975 (info, (h ? &h->root : NULL), name, howto->name, 7976 (bfd_vma) 0, input_bfd, input_section, 7977 rel->r_offset)))) 7978 return FALSE; 7979 break; 7980 7981 case bfd_reloc_undefined: 7982 if (!((*info->callbacks->undefined_symbol) 7983 (info, name, input_bfd, input_section, 7984 rel->r_offset, TRUE))) 7985 return FALSE; 7986 break; 7987 7988 case bfd_reloc_outofrange: 7989 error_message = _("out of range"); 7990 goto common_error; 7991 7992 case bfd_reloc_notsupported: 7993 error_message = _("unsupported relocation"); 7994 goto common_error; 7995 7996 case bfd_reloc_dangerous: 7997 /* error_message should already be set. */ 7998 goto common_error; 7999 8000 default: 8001 error_message = _("unknown error"); 8002 /* Fall through. */ 8003 8004 common_error: 8005 BFD_ASSERT (error_message != NULL); 8006 if (!((*info->callbacks->reloc_dangerous) 8007 (info, error_message, input_bfd, input_section, 8008 rel->r_offset))) 8009 return FALSE; 8010 break; 8011 } 8012 } 8013 } 8014 8015 return TRUE; 8016 } 8017 8018 /* Set the right machine number. */ 8019 8020 static bfd_boolean 8021 elf32_arm_object_p (bfd *abfd) 8022 { 8023 unsigned int mach; 8024 8025 mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION); 8026 8027 if (mach != bfd_mach_arm_unknown) 8028 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); 8029 8030 else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT) 8031 bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312); 8032 8033 else 8034 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); 8035 8036 return TRUE; 8037 } 8038 8039 /* Function to keep ARM specific flags in the ELF header. */ 8040 8041 static bfd_boolean 8042 elf32_arm_set_private_flags (bfd *abfd, flagword flags) 8043 { 8044 if (elf_flags_init (abfd) 8045 && elf_elfheader (abfd)->e_flags != flags) 8046 { 8047 if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) 8048 { 8049 if (flags & EF_ARM_INTERWORK) 8050 (*_bfd_error_handler) 8051 (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"), 8052 abfd); 8053 else 8054 _bfd_error_handler 8055 (_("Warning: Clearing the interworking flag of %B due to outside request"), 8056 abfd); 8057 } 8058 } 8059 else 8060 { 8061 elf_elfheader (abfd)->e_flags = flags; 8062 elf_flags_init (abfd) = TRUE; 8063 } 8064 8065 return TRUE; 8066 } 8067 8068 /* Copy backend specific data from one object module to another. */ 8069 8070 static bfd_boolean 8071 elf32_arm_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 8072 { 8073 flagword in_flags; 8074 flagword out_flags; 8075 8076 if (! is_arm_elf (ibfd) || ! is_arm_elf (obfd)) 8077 return TRUE; 8078 8079 in_flags = elf_elfheader (ibfd)->e_flags; 8080 out_flags = elf_elfheader (obfd)->e_flags; 8081 8082 if (elf_flags_init (obfd) 8083 && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN 8084 && in_flags != out_flags) 8085 { 8086 /* Cannot mix APCS26 and APCS32 code. */ 8087 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) 8088 return FALSE; 8089 8090 /* Cannot mix float APCS and non-float APCS code. */ 8091 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) 8092 return FALSE; 8093 8094 /* If the src and dest have different interworking flags 8095 then turn off the interworking bit. */ 8096 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) 8097 { 8098 if (out_flags & EF_ARM_INTERWORK) 8099 _bfd_error_handler 8100 (_("Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"), 8101 obfd, ibfd); 8102 8103 in_flags &= ~EF_ARM_INTERWORK; 8104 } 8105 8106 /* Likewise for PIC, though don't warn for this case. */ 8107 if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC)) 8108 in_flags &= ~EF_ARM_PIC; 8109 } 8110 8111 elf_elfheader (obfd)->e_flags = in_flags; 8112 elf_flags_init (obfd) = TRUE; 8113 8114 /* Also copy the EI_OSABI field. */ 8115 elf_elfheader (obfd)->e_ident[EI_OSABI] = 8116 elf_elfheader (ibfd)->e_ident[EI_OSABI]; 8117 8118 /* Copy object attributes. */ 8119 _bfd_elf_copy_obj_attributes (ibfd, obfd); 8120 8121 return TRUE; 8122 } 8123 8124 /* Values for Tag_ABI_PCS_R9_use. */ 8125 enum 8126 { 8127 AEABI_R9_V6, 8128 AEABI_R9_SB, 8129 AEABI_R9_TLS, 8130 AEABI_R9_unused 8131 }; 8132 8133 /* Values for Tag_ABI_PCS_RW_data. */ 8134 enum 8135 { 8136 AEABI_PCS_RW_data_absolute, 8137 AEABI_PCS_RW_data_PCrel, 8138 AEABI_PCS_RW_data_SBrel, 8139 AEABI_PCS_RW_data_unused 8140 }; 8141 8142 /* Values for Tag_ABI_enum_size. */ 8143 enum 8144 { 8145 AEABI_enum_unused, 8146 AEABI_enum_short, 8147 AEABI_enum_wide, 8148 AEABI_enum_forced_wide 8149 }; 8150 8151 /* Determine whether an object attribute tag takes an integer, a 8152 string or both. */ 8153 8154 static int 8155 elf32_arm_obj_attrs_arg_type (int tag) 8156 { 8157 if (tag == Tag_compatibility) 8158 return 3; 8159 else if (tag == 4 || tag == 5) 8160 return 2; 8161 else if (tag < 32) 8162 return 1; 8163 else 8164 return (tag & 1) != 0 ? 2 : 1; 8165 } 8166 8167 /* Merge EABI object attributes from IBFD into OBFD. Raise an error if there 8168 are conflicting attributes. */ 8169 8170 static bfd_boolean 8171 elf32_arm_merge_eabi_attributes (bfd *ibfd, bfd *obfd) 8172 { 8173 obj_attribute *in_attr; 8174 obj_attribute *out_attr; 8175 obj_attribute_list *in_list; 8176 /* Some tags have 0 = don't care, 1 = strong requirement, 8177 2 = weak requirement. */ 8178 static const int order_312[3] = {3, 1, 2}; 8179 /* For use with Tag_VFP_arch. */ 8180 static const int order_01243[5] = {0, 1, 2, 4, 3}; 8181 int i; 8182 8183 if (!elf_known_obj_attributes_proc (obfd)[0].i) 8184 { 8185 /* This is the first object. Copy the attributes. */ 8186 _bfd_elf_copy_obj_attributes (ibfd, obfd); 8187 8188 /* Use the Tag_null value to indicate the attributes have been 8189 initialized. */ 8190 elf_known_obj_attributes_proc (obfd)[0].i = 1; 8191 8192 return TRUE; 8193 } 8194 8195 in_attr = elf_known_obj_attributes_proc (ibfd); 8196 out_attr = elf_known_obj_attributes_proc (obfd); 8197 /* This needs to happen before Tag_ABI_FP_number_model is merged. */ 8198 if (in_attr[Tag_ABI_VFP_args].i != out_attr[Tag_ABI_VFP_args].i) 8199 { 8200 /* Ignore mismatches if teh object doesn't use floating point. */ 8201 if (out_attr[Tag_ABI_FP_number_model].i == 0) 8202 out_attr[Tag_ABI_VFP_args].i = in_attr[Tag_ABI_VFP_args].i; 8203 else if (in_attr[Tag_ABI_FP_number_model].i != 0) 8204 { 8205 _bfd_error_handler 8206 (_("ERROR: %B uses VFP register arguments, %B does not"), 8207 ibfd, obfd); 8208 return FALSE; 8209 } 8210 } 8211 8212 for (i = 4; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++) 8213 { 8214 /* Merge this attribute with existing attributes. */ 8215 switch (i) 8216 { 8217 case Tag_CPU_raw_name: 8218 case Tag_CPU_name: 8219 /* Use whichever has the greatest architecture requirements. We 8220 won't necessarily have both the above tags, so make sure input 8221 name is non-NULL. */ 8222 if (in_attr[Tag_CPU_arch].i > out_attr[Tag_CPU_arch].i 8223 && in_attr[i].s) 8224 out_attr[i].s = _bfd_elf_attr_strdup (obfd, in_attr[i].s); 8225 break; 8226 8227 case Tag_ABI_optimization_goals: 8228 case Tag_ABI_FP_optimization_goals: 8229 /* Use the first value seen. */ 8230 break; 8231 8232 case Tag_CPU_arch: 8233 case Tag_ARM_ISA_use: 8234 case Tag_THUMB_ISA_use: 8235 case Tag_WMMX_arch: 8236 case Tag_NEON_arch: 8237 /* ??? Do NEON and WMMX conflict? */ 8238 case Tag_ABI_FP_rounding: 8239 case Tag_ABI_FP_denormal: 8240 case Tag_ABI_FP_exceptions: 8241 case Tag_ABI_FP_user_exceptions: 8242 case Tag_ABI_FP_number_model: 8243 case Tag_ABI_align8_preserved: 8244 case Tag_ABI_HardFP_use: 8245 /* Use the largest value specified. */ 8246 if (in_attr[i].i > out_attr[i].i) 8247 out_attr[i].i = in_attr[i].i; 8248 break; 8249 8250 case Tag_CPU_arch_profile: 8251 /* Warn if conflicting architecture profiles used. */ 8252 if (out_attr[i].i && in_attr[i].i && in_attr[i].i != out_attr[i].i) 8253 { 8254 _bfd_error_handler 8255 (_("ERROR: %B: Conflicting architecture profiles %c/%c"), 8256 ibfd, in_attr[i].i, out_attr[i].i); 8257 return FALSE; 8258 } 8259 if (in_attr[i].i) 8260 out_attr[i].i = in_attr[i].i; 8261 break; 8262 case Tag_VFP_arch: 8263 if (in_attr[i].i > 4 || out_attr[i].i > 4 8264 || order_01243[in_attr[i].i] > order_01243[out_attr[i].i]) 8265 out_attr[i].i = in_attr[i].i; 8266 break; 8267 case Tag_PCS_config: 8268 if (out_attr[i].i == 0) 8269 out_attr[i].i = in_attr[i].i; 8270 else if (in_attr[i].i != 0 && out_attr[i].i != 0) 8271 { 8272 /* It's sometimes ok to mix different configs, so this is only 8273 a warning. */ 8274 _bfd_error_handler 8275 (_("Warning: %B: Conflicting platform configuration"), ibfd); 8276 } 8277 break; 8278 case Tag_ABI_PCS_R9_use: 8279 if (in_attr[i].i != out_attr[i].i 8280 && out_attr[i].i != AEABI_R9_unused 8281 && in_attr[i].i != AEABI_R9_unused) 8282 { 8283 _bfd_error_handler 8284 (_("ERROR: %B: Conflicting use of R9"), ibfd); 8285 return FALSE; 8286 } 8287 if (out_attr[i].i == AEABI_R9_unused) 8288 out_attr[i].i = in_attr[i].i; 8289 break; 8290 case Tag_ABI_PCS_RW_data: 8291 if (in_attr[i].i == AEABI_PCS_RW_data_SBrel 8292 && out_attr[Tag_ABI_PCS_R9_use].i != AEABI_R9_SB 8293 && out_attr[Tag_ABI_PCS_R9_use].i != AEABI_R9_unused) 8294 { 8295 _bfd_error_handler 8296 (_("ERROR: %B: SB relative addressing conflicts with use of R9"), 8297 ibfd); 8298 return FALSE; 8299 } 8300 /* Use the smallest value specified. */ 8301 if (in_attr[i].i < out_attr[i].i) 8302 out_attr[i].i = in_attr[i].i; 8303 break; 8304 case Tag_ABI_PCS_RO_data: 8305 /* Use the smallest value specified. */ 8306 if (in_attr[i].i < out_attr[i].i) 8307 out_attr[i].i = in_attr[i].i; 8308 break; 8309 case Tag_ABI_PCS_GOT_use: 8310 if (in_attr[i].i > 2 || out_attr[i].i > 2 8311 || order_312[in_attr[i].i] < order_312[out_attr[i].i]) 8312 out_attr[i].i = in_attr[i].i; 8313 break; 8314 case Tag_ABI_PCS_wchar_t: 8315 if (out_attr[i].i && in_attr[i].i && out_attr[i].i != in_attr[i].i 8316 && !elf_arm_tdata (obfd)->no_wchar_size_warning) 8317 { 8318 _bfd_error_handler 8319 (_("warning: %B uses %u-byte wchar_t yet the output is to use %u-byte wchar_t; use of wchar_t values across objects may fail"), 8320 ibfd, in_attr[i].i, out_attr[i].i); 8321 } 8322 else if (in_attr[i].i && !out_attr[i].i) 8323 out_attr[i].i = in_attr[i].i; 8324 break; 8325 case Tag_ABI_align8_needed: 8326 /* ??? Check against Tag_ABI_align8_preserved. */ 8327 if (in_attr[i].i > 2 || out_attr[i].i > 2 8328 || order_312[in_attr[i].i] < order_312[out_attr[i].i]) 8329 out_attr[i].i = in_attr[i].i; 8330 break; 8331 case Tag_ABI_enum_size: 8332 if (in_attr[i].i != AEABI_enum_unused) 8333 { 8334 if (out_attr[i].i == AEABI_enum_unused 8335 || out_attr[i].i == AEABI_enum_forced_wide) 8336 { 8337 /* The existing object is compatible with anything. 8338 Use whatever requirements the new object has. */ 8339 out_attr[i].i = in_attr[i].i; 8340 } 8341 else if (in_attr[i].i != AEABI_enum_forced_wide 8342 && out_attr[i].i != in_attr[i].i 8343 && !elf_arm_tdata (obfd)->no_enum_size_warning) 8344 { 8345 const char *aeabi_enum_names[] = 8346 { "", "variable-size", "32-bit", "" }; 8347 _bfd_error_handler 8348 (_("warning: %B uses %s enums yet the output is to use %s enums; use of enum values across objects may fail"), 8349 ibfd, aeabi_enum_names[in_attr[i].i], 8350 aeabi_enum_names[out_attr[i].i]); 8351 } 8352 } 8353 break; 8354 case Tag_ABI_VFP_args: 8355 /* Aready done. */ 8356 break; 8357 case Tag_ABI_WMMX_args: 8358 if (in_attr[i].i != out_attr[i].i) 8359 { 8360 _bfd_error_handler 8361 (_("ERROR: %B uses iWMMXt register arguments, %B does not"), 8362 ibfd, obfd); 8363 return FALSE; 8364 } 8365 break; 8366 default: /* All known attributes should be explicitly covered. */ 8367 abort (); 8368 } 8369 8370 if (in_attr[i].type && !out_attr[i].type) 8371 switch (in_attr[i].type) 8372 { 8373 case 1: 8374 if (out_attr[i].i) 8375 out_attr[i].type = 1; 8376 break; 8377 8378 case 2: 8379 if (out_attr[i].s) 8380 out_attr[i].type = 2; 8381 break; 8382 8383 default: 8384 abort (); 8385 } 8386 } 8387 8388 /* Merge Tag_compatibility attributes and any common GNU ones. */ 8389 _bfd_elf_merge_object_attributes (ibfd, obfd); 8390 8391 /* Check for any attributes not known on ARM. */ 8392 in_list = elf_other_obj_attributes_proc (ibfd); 8393 while (in_list && in_list->tag == Tag_compatibility) 8394 in_list = in_list->next; 8395 8396 for (; in_list; in_list = in_list->next) 8397 { 8398 if ((in_list->tag & 128) < 64) 8399 { 8400 _bfd_error_handler 8401 (_("Warning: %B: Unknown EABI object attribute %d"), 8402 ibfd, in_list->tag); 8403 break; 8404 } 8405 } 8406 return TRUE; 8407 } 8408 8409 8410 /* Return TRUE if the two EABI versions are incompatible. */ 8411 8412 static bfd_boolean 8413 elf32_arm_versions_compatible (unsigned iver, unsigned over) 8414 { 8415 /* v4 and v5 are the same spec before and after it was released, 8416 so allow mixing them. */ 8417 if ((iver == EF_ARM_EABI_VER4 && over == EF_ARM_EABI_VER5) 8418 || (iver == EF_ARM_EABI_VER5 && over == EF_ARM_EABI_VER4)) 8419 return TRUE; 8420 8421 return (iver == over); 8422 } 8423 8424 /* Merge backend specific data from an object file to the output 8425 object file when linking. */ 8426 8427 static bfd_boolean 8428 elf32_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd) 8429 { 8430 flagword out_flags; 8431 flagword in_flags; 8432 bfd_boolean flags_compatible = TRUE; 8433 asection *sec; 8434 8435 /* Check if we have the same endianess. */ 8436 if (! _bfd_generic_verify_endian_match (ibfd, obfd)) 8437 return FALSE; 8438 8439 if (! is_arm_elf (ibfd) || ! is_arm_elf (obfd)) 8440 return TRUE; 8441 8442 if (!elf32_arm_merge_eabi_attributes (ibfd, obfd)) 8443 return FALSE; 8444 8445 /* The input BFD must have had its flags initialised. */ 8446 /* The following seems bogus to me -- The flags are initialized in 8447 the assembler but I don't think an elf_flags_init field is 8448 written into the object. */ 8449 /* BFD_ASSERT (elf_flags_init (ibfd)); */ 8450 8451 in_flags = elf_elfheader (ibfd)->e_flags; 8452 out_flags = elf_elfheader (obfd)->e_flags; 8453 8454 /* In theory there is no reason why we couldn't handle this. However 8455 in practice it isn't even close to working and there is no real 8456 reason to want it. */ 8457 if (EF_ARM_EABI_VERSION (in_flags) >= EF_ARM_EABI_VER4 8458 && !(ibfd->flags & DYNAMIC) 8459 && (in_flags & EF_ARM_BE8)) 8460 { 8461 _bfd_error_handler (_("ERROR: %B is already in final BE8 format"), 8462 ibfd); 8463 return FALSE; 8464 } 8465 8466 if (!elf_flags_init (obfd)) 8467 { 8468 /* If the input is the default architecture and had the default 8469 flags then do not bother setting the flags for the output 8470 architecture, instead allow future merges to do this. If no 8471 future merges ever set these flags then they will retain their 8472 uninitialised values, which surprise surprise, correspond 8473 to the default values. */ 8474 if (bfd_get_arch_info (ibfd)->the_default 8475 && elf_elfheader (ibfd)->e_flags == 0) 8476 return TRUE; 8477 8478 elf_flags_init (obfd) = TRUE; 8479 elf_elfheader (obfd)->e_flags = in_flags; 8480 8481 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 8482 && bfd_get_arch_info (obfd)->the_default) 8483 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); 8484 8485 return TRUE; 8486 } 8487 8488 /* Determine what should happen if the input ARM architecture 8489 does not match the output ARM architecture. */ 8490 if (! bfd_arm_merge_machines (ibfd, obfd)) 8491 return FALSE; 8492 8493 /* Identical flags must be compatible. */ 8494 if (in_flags == out_flags) 8495 return TRUE; 8496 8497 /* Check to see if the input BFD actually contains any sections. If 8498 not, its flags may not have been initialised either, but it 8499 cannot actually cause any incompatiblity. Do not short-circuit 8500 dynamic objects; their section list may be emptied by 8501 elf_link_add_object_symbols. 8502 8503 Also check to see if there are no code sections in the input. 8504 In this case there is no need to check for code specific flags. 8505 XXX - do we need to worry about floating-point format compatability 8506 in data sections ? */ 8507 if (!(ibfd->flags & DYNAMIC)) 8508 { 8509 bfd_boolean null_input_bfd = TRUE; 8510 bfd_boolean only_data_sections = TRUE; 8511 8512 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 8513 { 8514 /* Ignore synthetic glue sections. */ 8515 if (strcmp (sec->name, ".glue_7") 8516 && strcmp (sec->name, ".glue_7t")) 8517 { 8518 if ((bfd_get_section_flags (ibfd, sec) 8519 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) 8520 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) 8521 only_data_sections = FALSE; 8522 8523 null_input_bfd = FALSE; 8524 break; 8525 } 8526 } 8527 8528 if (null_input_bfd || only_data_sections) 8529 return TRUE; 8530 } 8531 8532 /* Complain about various flag mismatches. */ 8533 if (!elf32_arm_versions_compatible (EF_ARM_EABI_VERSION (in_flags), 8534 EF_ARM_EABI_VERSION (out_flags))) 8535 { 8536 _bfd_error_handler 8537 (_("ERROR: Source object %B has EABI version %d, but target %B has EABI version %d"), 8538 ibfd, obfd, 8539 (in_flags & EF_ARM_EABIMASK) >> 24, 8540 (out_flags & EF_ARM_EABIMASK) >> 24); 8541 return FALSE; 8542 } 8543 8544 /* Not sure what needs to be checked for EABI versions >= 1. */ 8545 /* VxWorks libraries do not use these flags. */ 8546 if (get_elf_backend_data (obfd) != &elf32_arm_vxworks_bed 8547 && get_elf_backend_data (ibfd) != &elf32_arm_vxworks_bed 8548 && EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) 8549 { 8550 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) 8551 { 8552 _bfd_error_handler 8553 (_("ERROR: %B is compiled for APCS-%d, whereas target %B uses APCS-%d"), 8554 ibfd, obfd, 8555 in_flags & EF_ARM_APCS_26 ? 26 : 32, 8556 out_flags & EF_ARM_APCS_26 ? 26 : 32); 8557 flags_compatible = FALSE; 8558 } 8559 8560 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) 8561 { 8562 if (in_flags & EF_ARM_APCS_FLOAT) 8563 _bfd_error_handler 8564 (_("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers"), 8565 ibfd, obfd); 8566 else 8567 _bfd_error_handler 8568 (_("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers"), 8569 ibfd, obfd); 8570 8571 flags_compatible = FALSE; 8572 } 8573 8574 if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT)) 8575 { 8576 if (in_flags & EF_ARM_VFP_FLOAT) 8577 _bfd_error_handler 8578 (_("ERROR: %B uses VFP instructions, whereas %B does not"), 8579 ibfd, obfd); 8580 else 8581 _bfd_error_handler 8582 (_("ERROR: %B uses FPA instructions, whereas %B does not"), 8583 ibfd, obfd); 8584 8585 flags_compatible = FALSE; 8586 } 8587 8588 if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT)) 8589 { 8590 if (in_flags & EF_ARM_MAVERICK_FLOAT) 8591 _bfd_error_handler 8592 (_("ERROR: %B uses Maverick instructions, whereas %B does not"), 8593 ibfd, obfd); 8594 else 8595 _bfd_error_handler 8596 (_("ERROR: %B does not use Maverick instructions, whereas %B does"), 8597 ibfd, obfd); 8598 8599 flags_compatible = FALSE; 8600 } 8601 8602 #ifdef EF_ARM_SOFT_FLOAT 8603 if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT)) 8604 { 8605 /* We can allow interworking between code that is VFP format 8606 layout, and uses either soft float or integer regs for 8607 passing floating point arguments and results. We already 8608 know that the APCS_FLOAT flags match; similarly for VFP 8609 flags. */ 8610 if ((in_flags & EF_ARM_APCS_FLOAT) != 0 8611 || (in_flags & EF_ARM_VFP_FLOAT) == 0) 8612 { 8613 if (in_flags & EF_ARM_SOFT_FLOAT) 8614 _bfd_error_handler 8615 (_("ERROR: %B uses software FP, whereas %B uses hardware FP"), 8616 ibfd, obfd); 8617 else 8618 _bfd_error_handler 8619 (_("ERROR: %B uses hardware FP, whereas %B uses software FP"), 8620 ibfd, obfd); 8621 8622 flags_compatible = FALSE; 8623 } 8624 } 8625 #endif 8626 8627 /* Interworking mismatch is only a warning. */ 8628 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) 8629 { 8630 if (in_flags & EF_ARM_INTERWORK) 8631 { 8632 _bfd_error_handler 8633 (_("Warning: %B supports interworking, whereas %B does not"), 8634 ibfd, obfd); 8635 } 8636 else 8637 { 8638 _bfd_error_handler 8639 (_("Warning: %B does not support interworking, whereas %B does"), 8640 ibfd, obfd); 8641 } 8642 } 8643 } 8644 8645 return flags_compatible; 8646 } 8647 8648 /* Display the flags field. */ 8649 8650 static bfd_boolean 8651 elf32_arm_print_private_bfd_data (bfd *abfd, void * ptr) 8652 { 8653 FILE * file = (FILE *) ptr; 8654 unsigned long flags; 8655 8656 BFD_ASSERT (abfd != NULL && ptr != NULL); 8657 8658 /* Print normal ELF private data. */ 8659 _bfd_elf_print_private_bfd_data (abfd, ptr); 8660 8661 flags = elf_elfheader (abfd)->e_flags; 8662 /* Ignore init flag - it may not be set, despite the flags field 8663 containing valid data. */ 8664 8665 /* xgettext:c-format */ 8666 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 8667 8668 switch (EF_ARM_EABI_VERSION (flags)) 8669 { 8670 case EF_ARM_EABI_UNKNOWN: 8671 /* The following flag bits are GNU extensions and not part of the 8672 official ARM ELF extended ABI. Hence they are only decoded if 8673 the EABI version is not set. */ 8674 if (flags & EF_ARM_INTERWORK) 8675 fprintf (file, _(" [interworking enabled]")); 8676 8677 if (flags & EF_ARM_APCS_26) 8678 fprintf (file, " [APCS-26]"); 8679 else 8680 fprintf (file, " [APCS-32]"); 8681 8682 if (flags & EF_ARM_VFP_FLOAT) 8683 fprintf (file, _(" [VFP float format]")); 8684 else if (flags & EF_ARM_MAVERICK_FLOAT) 8685 fprintf (file, _(" [Maverick float format]")); 8686 else 8687 fprintf (file, _(" [FPA float format]")); 8688 8689 if (flags & EF_ARM_APCS_FLOAT) 8690 fprintf (file, _(" [floats passed in float registers]")); 8691 8692 if (flags & EF_ARM_PIC) 8693 fprintf (file, _(" [position independent]")); 8694 8695 if (flags & EF_ARM_NEW_ABI) 8696 fprintf (file, _(" [new ABI]")); 8697 8698 if (flags & EF_ARM_OLD_ABI) 8699 fprintf (file, _(" [old ABI]")); 8700 8701 if (flags & EF_ARM_SOFT_FLOAT) 8702 fprintf (file, _(" [software FP]")); 8703 8704 flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT 8705 | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI 8706 | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT 8707 | EF_ARM_MAVERICK_FLOAT); 8708 break; 8709 8710 case EF_ARM_EABI_VER1: 8711 fprintf (file, _(" [Version1 EABI]")); 8712 8713 if (flags & EF_ARM_SYMSARESORTED) 8714 fprintf (file, _(" [sorted symbol table]")); 8715 else 8716 fprintf (file, _(" [unsorted symbol table]")); 8717 8718 flags &= ~ EF_ARM_SYMSARESORTED; 8719 break; 8720 8721 case EF_ARM_EABI_VER2: 8722 fprintf (file, _(" [Version2 EABI]")); 8723 8724 if (flags & EF_ARM_SYMSARESORTED) 8725 fprintf (file, _(" [sorted symbol table]")); 8726 else 8727 fprintf (file, _(" [unsorted symbol table]")); 8728 8729 if (flags & EF_ARM_DYNSYMSUSESEGIDX) 8730 fprintf (file, _(" [dynamic symbols use segment index]")); 8731 8732 if (flags & EF_ARM_MAPSYMSFIRST) 8733 fprintf (file, _(" [mapping symbols precede others]")); 8734 8735 flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX 8736 | EF_ARM_MAPSYMSFIRST); 8737 break; 8738 8739 case EF_ARM_EABI_VER3: 8740 fprintf (file, _(" [Version3 EABI]")); 8741 break; 8742 8743 case EF_ARM_EABI_VER4: 8744 fprintf (file, _(" [Version4 EABI]")); 8745 goto eabi; 8746 8747 case EF_ARM_EABI_VER5: 8748 fprintf (file, _(" [Version5 EABI]")); 8749 eabi: 8750 if (flags & EF_ARM_BE8) 8751 fprintf (file, _(" [BE8]")); 8752 8753 if (flags & EF_ARM_LE8) 8754 fprintf (file, _(" [LE8]")); 8755 8756 flags &= ~(EF_ARM_LE8 | EF_ARM_BE8); 8757 break; 8758 8759 default: 8760 fprintf (file, _(" <EABI version unrecognised>")); 8761 break; 8762 } 8763 8764 flags &= ~ EF_ARM_EABIMASK; 8765 8766 if (flags & EF_ARM_RELEXEC) 8767 fprintf (file, _(" [relocatable executable]")); 8768 8769 if (flags & EF_ARM_HASENTRY) 8770 fprintf (file, _(" [has entry point]")); 8771 8772 flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); 8773 8774 if (flags) 8775 fprintf (file, _("<Unrecognised flag bits set>")); 8776 8777 fputc ('\n', file); 8778 8779 return TRUE; 8780 } 8781 8782 static int 8783 elf32_arm_get_symbol_type (Elf_Internal_Sym * elf_sym, int type) 8784 { 8785 switch (ELF_ST_TYPE (elf_sym->st_info)) 8786 { 8787 case STT_ARM_TFUNC: 8788 return ELF_ST_TYPE (elf_sym->st_info); 8789 8790 case STT_ARM_16BIT: 8791 /* If the symbol is not an object, return the STT_ARM_16BIT flag. 8792 This allows us to distinguish between data used by Thumb instructions 8793 and non-data (which is probably code) inside Thumb regions of an 8794 executable. */ 8795 if (type != STT_OBJECT && type != STT_TLS) 8796 return ELF_ST_TYPE (elf_sym->st_info); 8797 break; 8798 8799 default: 8800 break; 8801 } 8802 8803 return type; 8804 } 8805 8806 static asection * 8807 elf32_arm_gc_mark_hook (asection *sec, 8808 struct bfd_link_info *info, 8809 Elf_Internal_Rela *rel, 8810 struct elf_link_hash_entry *h, 8811 Elf_Internal_Sym *sym) 8812 { 8813 if (h != NULL) 8814 switch (ELF32_R_TYPE (rel->r_info)) 8815 { 8816 case R_ARM_GNU_VTINHERIT: 8817 case R_ARM_GNU_VTENTRY: 8818 return NULL; 8819 } 8820 8821 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 8822 } 8823 8824 /* Update the got entry reference counts for the section being removed. */ 8825 8826 static bfd_boolean 8827 elf32_arm_gc_sweep_hook (bfd * abfd, 8828 struct bfd_link_info * info, 8829 asection * sec, 8830 const Elf_Internal_Rela * relocs) 8831 { 8832 Elf_Internal_Shdr *symtab_hdr; 8833 struct elf_link_hash_entry **sym_hashes; 8834 bfd_signed_vma *local_got_refcounts; 8835 const Elf_Internal_Rela *rel, *relend; 8836 struct elf32_arm_link_hash_table * globals; 8837 8838 if (info->relocatable) 8839 return TRUE; 8840 8841 globals = elf32_arm_hash_table (info); 8842 8843 elf_section_data (sec)->local_dynrel = NULL; 8844 8845 symtab_hdr = & elf_symtab_hdr (abfd); 8846 sym_hashes = elf_sym_hashes (abfd); 8847 local_got_refcounts = elf_local_got_refcounts (abfd); 8848 8849 check_use_blx (globals); 8850 8851 relend = relocs + sec->reloc_count; 8852 for (rel = relocs; rel < relend; rel++) 8853 { 8854 unsigned long r_symndx; 8855 struct elf_link_hash_entry *h = NULL; 8856 int r_type; 8857 8858 r_symndx = ELF32_R_SYM (rel->r_info); 8859 if (r_symndx >= symtab_hdr->sh_info) 8860 { 8861 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 8862 while (h->root.type == bfd_link_hash_indirect 8863 || h->root.type == bfd_link_hash_warning) 8864 h = (struct elf_link_hash_entry *) h->root.u.i.link; 8865 } 8866 8867 r_type = ELF32_R_TYPE (rel->r_info); 8868 r_type = arm_real_reloc_type (globals, r_type); 8869 switch (r_type) 8870 { 8871 case R_ARM_GOT32: 8872 case R_ARM_GOT_PREL: 8873 case R_ARM_TLS_GD32: 8874 case R_ARM_TLS_IE32: 8875 if (h != NULL) 8876 { 8877 if (h->got.refcount > 0) 8878 h->got.refcount -= 1; 8879 } 8880 else if (local_got_refcounts != NULL) 8881 { 8882 if (local_got_refcounts[r_symndx] > 0) 8883 local_got_refcounts[r_symndx] -= 1; 8884 } 8885 break; 8886 8887 case R_ARM_TLS_LDM32: 8888 elf32_arm_hash_table (info)->tls_ldm_got.refcount -= 1; 8889 break; 8890 8891 case R_ARM_ABS32: 8892 case R_ARM_ABS32_NOI: 8893 case R_ARM_REL32: 8894 case R_ARM_REL32_NOI: 8895 case R_ARM_PC24: 8896 case R_ARM_PLT32: 8897 case R_ARM_CALL: 8898 case R_ARM_JUMP24: 8899 case R_ARM_PREL31: 8900 case R_ARM_THM_CALL: 8901 case R_ARM_THM_JUMP24: 8902 case R_ARM_THM_JUMP19: 8903 case R_ARM_MOVW_ABS_NC: 8904 case R_ARM_MOVT_ABS: 8905 case R_ARM_MOVW_PREL_NC: 8906 case R_ARM_MOVT_PREL: 8907 case R_ARM_THM_MOVW_ABS_NC: 8908 case R_ARM_THM_MOVT_ABS: 8909 case R_ARM_THM_MOVW_PREL_NC: 8910 case R_ARM_THM_MOVT_PREL: 8911 /* Should the interworking branches be here also? */ 8912 8913 if (h != NULL) 8914 { 8915 struct elf32_arm_link_hash_entry *eh; 8916 struct elf32_arm_relocs_copied **pp; 8917 struct elf32_arm_relocs_copied *p; 8918 8919 eh = (struct elf32_arm_link_hash_entry *) h; 8920 8921 if (h->plt.refcount > 0) 8922 { 8923 h->plt.refcount -= 1; 8924 if (r_type == R_ARM_THM_CALL) 8925 eh->plt_maybe_thumb_refcount--; 8926 8927 if (r_type == R_ARM_THM_JUMP24 8928 || r_type == R_ARM_THM_JUMP19) 8929 eh->plt_thumb_refcount--; 8930 } 8931 8932 if (r_type == R_ARM_ABS32 8933 || r_type == R_ARM_REL32 8934 || r_type == R_ARM_ABS32_NOI 8935 || r_type == R_ARM_REL32_NOI) 8936 { 8937 for (pp = &eh->relocs_copied; (p = *pp) != NULL; 8938 pp = &p->next) 8939 if (p->section == sec) 8940 { 8941 p->count -= 1; 8942 if (ELF32_R_TYPE (rel->r_info) == R_ARM_REL32 8943 || ELF32_R_TYPE (rel->r_info) == R_ARM_REL32_NOI) 8944 p->pc_count -= 1; 8945 if (p->count == 0) 8946 *pp = p->next; 8947 break; 8948 } 8949 } 8950 } 8951 break; 8952 8953 default: 8954 break; 8955 } 8956 } 8957 8958 return TRUE; 8959 } 8960 8961 /* Look through the relocs for a section during the first phase. */ 8962 8963 static bfd_boolean 8964 elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info, 8965 asection *sec, const Elf_Internal_Rela *relocs) 8966 { 8967 Elf_Internal_Shdr *symtab_hdr; 8968 struct elf_link_hash_entry **sym_hashes; 8969 const Elf_Internal_Rela *rel; 8970 const Elf_Internal_Rela *rel_end; 8971 bfd *dynobj; 8972 asection *sreloc; 8973 bfd_vma *local_got_offsets; 8974 struct elf32_arm_link_hash_table *htab; 8975 bfd_boolean needs_plt; 8976 8977 if (info->relocatable) 8978 return TRUE; 8979 8980 BFD_ASSERT (is_arm_elf (abfd)); 8981 8982 htab = elf32_arm_hash_table (info); 8983 sreloc = NULL; 8984 8985 /* Create dynamic sections for relocatable executables so that we can 8986 copy relocations. */ 8987 if (htab->root.is_relocatable_executable 8988 && ! htab->root.dynamic_sections_created) 8989 { 8990 if (! _bfd_elf_link_create_dynamic_sections (abfd, info)) 8991 return FALSE; 8992 } 8993 8994 dynobj = elf_hash_table (info)->dynobj; 8995 local_got_offsets = elf_local_got_offsets (abfd); 8996 8997 symtab_hdr = & elf_symtab_hdr (abfd); 8998 sym_hashes = elf_sym_hashes (abfd); 8999 9000 rel_end = relocs + sec->reloc_count; 9001 for (rel = relocs; rel < rel_end; rel++) 9002 { 9003 struct elf_link_hash_entry *h; 9004 struct elf32_arm_link_hash_entry *eh; 9005 unsigned long r_symndx; 9006 int r_type; 9007 9008 r_symndx = ELF32_R_SYM (rel->r_info); 9009 r_type = ELF32_R_TYPE (rel->r_info); 9010 r_type = arm_real_reloc_type (htab, r_type); 9011 9012 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 9013 { 9014 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), abfd, 9015 r_symndx); 9016 return FALSE; 9017 } 9018 9019 if (r_symndx < symtab_hdr->sh_info) 9020 h = NULL; 9021 else 9022 { 9023 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 9024 while (h->root.type == bfd_link_hash_indirect 9025 || h->root.type == bfd_link_hash_warning) 9026 h = (struct elf_link_hash_entry *) h->root.u.i.link; 9027 } 9028 9029 eh = (struct elf32_arm_link_hash_entry *) h; 9030 9031 switch (r_type) 9032 { 9033 case R_ARM_GOT32: 9034 case R_ARM_GOT_PREL: 9035 case R_ARM_TLS_GD32: 9036 case R_ARM_TLS_IE32: 9037 /* This symbol requires a global offset table entry. */ 9038 { 9039 int tls_type, old_tls_type; 9040 9041 switch (r_type) 9042 { 9043 case R_ARM_TLS_GD32: tls_type = GOT_TLS_GD; break; 9044 case R_ARM_TLS_IE32: tls_type = GOT_TLS_IE; break; 9045 default: tls_type = GOT_NORMAL; break; 9046 } 9047 9048 if (h != NULL) 9049 { 9050 h->got.refcount++; 9051 old_tls_type = elf32_arm_hash_entry (h)->tls_type; 9052 } 9053 else 9054 { 9055 bfd_signed_vma *local_got_refcounts; 9056 9057 /* This is a global offset table entry for a local symbol. */ 9058 local_got_refcounts = elf_local_got_refcounts (abfd); 9059 if (local_got_refcounts == NULL) 9060 { 9061 bfd_size_type size; 9062 9063 size = symtab_hdr->sh_info; 9064 size *= (sizeof (bfd_signed_vma) + sizeof (char)); 9065 local_got_refcounts = bfd_zalloc (abfd, size); 9066 if (local_got_refcounts == NULL) 9067 return FALSE; 9068 elf_local_got_refcounts (abfd) = local_got_refcounts; 9069 elf32_arm_local_got_tls_type (abfd) 9070 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 9071 } 9072 local_got_refcounts[r_symndx] += 1; 9073 old_tls_type = elf32_arm_local_got_tls_type (abfd) [r_symndx]; 9074 } 9075 9076 /* We will already have issued an error message if there is a 9077 TLS / non-TLS mismatch, based on the symbol type. We don't 9078 support any linker relaxations. So just combine any TLS 9079 types needed. */ 9080 if (old_tls_type != GOT_UNKNOWN && old_tls_type != GOT_NORMAL 9081 && tls_type != GOT_NORMAL) 9082 tls_type |= old_tls_type; 9083 9084 if (old_tls_type != tls_type) 9085 { 9086 if (h != NULL) 9087 elf32_arm_hash_entry (h)->tls_type = tls_type; 9088 else 9089 elf32_arm_local_got_tls_type (abfd) [r_symndx] = tls_type; 9090 } 9091 } 9092 /* Fall through. */ 9093 9094 case R_ARM_TLS_LDM32: 9095 if (r_type == R_ARM_TLS_LDM32) 9096 htab->tls_ldm_got.refcount++; 9097 /* Fall through. */ 9098 9099 case R_ARM_GOTOFF32: 9100 case R_ARM_GOTPC: 9101 if (htab->sgot == NULL) 9102 { 9103 if (htab->root.dynobj == NULL) 9104 htab->root.dynobj = abfd; 9105 if (!create_got_section (htab->root.dynobj, info)) 9106 return FALSE; 9107 } 9108 break; 9109 9110 case R_ARM_ABS12: 9111 /* VxWorks uses dynamic R_ARM_ABS12 relocations for 9112 ldr __GOTT_INDEX__ offsets. */ 9113 if (!htab->vxworks_p) 9114 break; 9115 /* Fall through. */ 9116 9117 case R_ARM_PC24: 9118 case R_ARM_PLT32: 9119 case R_ARM_CALL: 9120 case R_ARM_JUMP24: 9121 case R_ARM_PREL31: 9122 case R_ARM_THM_CALL: 9123 case R_ARM_THM_JUMP24: 9124 case R_ARM_THM_JUMP19: 9125 needs_plt = 1; 9126 goto normal_reloc; 9127 9128 case R_ARM_ABS32: 9129 case R_ARM_ABS32_NOI: 9130 case R_ARM_REL32: 9131 case R_ARM_REL32_NOI: 9132 case R_ARM_MOVW_ABS_NC: 9133 case R_ARM_MOVT_ABS: 9134 case R_ARM_MOVW_PREL_NC: 9135 case R_ARM_MOVT_PREL: 9136 case R_ARM_THM_MOVW_ABS_NC: 9137 case R_ARM_THM_MOVT_ABS: 9138 case R_ARM_THM_MOVW_PREL_NC: 9139 case R_ARM_THM_MOVT_PREL: 9140 needs_plt = 0; 9141 normal_reloc: 9142 9143 /* Should the interworking branches be listed here? */ 9144 if (h != NULL) 9145 { 9146 /* If this reloc is in a read-only section, we might 9147 need a copy reloc. We can't check reliably at this 9148 stage whether the section is read-only, as input 9149 sections have not yet been mapped to output sections. 9150 Tentatively set the flag for now, and correct in 9151 adjust_dynamic_symbol. */ 9152 if (!info->shared) 9153 h->non_got_ref = 1; 9154 9155 /* We may need a .plt entry if the function this reloc 9156 refers to is in a different object. We can't tell for 9157 sure yet, because something later might force the 9158 symbol local. */ 9159 if (needs_plt) 9160 h->needs_plt = 1; 9161 9162 /* If we create a PLT entry, this relocation will reference 9163 it, even if it's an ABS32 relocation. */ 9164 h->plt.refcount += 1; 9165 9166 /* It's too early to use htab->use_blx here, so we have to 9167 record possible blx references separately from 9168 relocs that definitely need a thumb stub. */ 9169 9170 if (r_type == R_ARM_THM_CALL) 9171 eh->plt_maybe_thumb_refcount += 1; 9172 9173 if (r_type == R_ARM_THM_JUMP24 9174 || r_type == R_ARM_THM_JUMP19) 9175 eh->plt_thumb_refcount += 1; 9176 } 9177 9178 /* If we are creating a shared library or relocatable executable, 9179 and this is a reloc against a global symbol, or a non PC 9180 relative reloc against a local symbol, then we need to copy 9181 the reloc into the shared library. However, if we are linking 9182 with -Bsymbolic, we do not need to copy a reloc against a 9183 global symbol which is defined in an object we are 9184 including in the link (i.e., DEF_REGULAR is set). At 9185 this point we have not seen all the input files, so it is 9186 possible that DEF_REGULAR is not set now but will be set 9187 later (it is never cleared). We account for that 9188 possibility below by storing information in the 9189 relocs_copied field of the hash table entry. */ 9190 if ((info->shared || htab->root.is_relocatable_executable) 9191 && (sec->flags & SEC_ALLOC) != 0 9192 && ((r_type == R_ARM_ABS32 || r_type == R_ARM_ABS32_NOI) 9193 || (h != NULL && ! h->needs_plt 9194 && (! info->symbolic || ! h->def_regular)))) 9195 { 9196 struct elf32_arm_relocs_copied *p, **head; 9197 9198 /* When creating a shared object, we must copy these 9199 reloc types into the output file. We create a reloc 9200 section in dynobj and make room for this reloc. */ 9201 if (sreloc == NULL) 9202 { 9203 const char * name; 9204 9205 name = (bfd_elf_string_from_elf_section 9206 (abfd, 9207 elf_elfheader (abfd)->e_shstrndx, 9208 elf_section_data (sec)->rel_hdr.sh_name)); 9209 if (name == NULL) 9210 return FALSE; 9211 9212 BFD_ASSERT (reloc_section_p (htab, name, sec)); 9213 9214 sreloc = bfd_get_section_by_name (dynobj, name); 9215 if (sreloc == NULL) 9216 { 9217 flagword flags; 9218 9219 flags = (SEC_HAS_CONTENTS | SEC_READONLY 9220 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 9221 if ((sec->flags & SEC_ALLOC) != 0 9222 /* BPABI objects never have dynamic 9223 relocations mapped. */ 9224 && !htab->symbian_p) 9225 flags |= SEC_ALLOC | SEC_LOAD; 9226 sreloc = bfd_make_section_with_flags (dynobj, 9227 name, 9228 flags); 9229 if (sreloc == NULL 9230 || ! bfd_set_section_alignment (dynobj, sreloc, 2)) 9231 return FALSE; 9232 } 9233 9234 elf_section_data (sec)->sreloc = sreloc; 9235 } 9236 9237 /* If this is a global symbol, we count the number of 9238 relocations we need for this symbol. */ 9239 if (h != NULL) 9240 { 9241 head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied; 9242 } 9243 else 9244 { 9245 /* Track dynamic relocs needed for local syms too. 9246 We really need local syms available to do this 9247 easily. Oh well. */ 9248 9249 asection *s; 9250 void *vpp; 9251 9252 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 9253 sec, r_symndx); 9254 if (s == NULL) 9255 return FALSE; 9256 9257 vpp = &elf_section_data (s)->local_dynrel; 9258 head = (struct elf32_arm_relocs_copied **) vpp; 9259 } 9260 9261 p = *head; 9262 if (p == NULL || p->section != sec) 9263 { 9264 bfd_size_type amt = sizeof *p; 9265 9266 p = bfd_alloc (htab->root.dynobj, amt); 9267 if (p == NULL) 9268 return FALSE; 9269 p->next = *head; 9270 *head = p; 9271 p->section = sec; 9272 p->count = 0; 9273 p->pc_count = 0; 9274 } 9275 9276 if (r_type == R_ARM_REL32 || r_type == R_ARM_REL32_NOI) 9277 p->pc_count += 1; 9278 p->count += 1; 9279 } 9280 break; 9281 9282 /* This relocation describes the C++ object vtable hierarchy. 9283 Reconstruct it for later use during GC. */ 9284 case R_ARM_GNU_VTINHERIT: 9285 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 9286 return FALSE; 9287 break; 9288 9289 /* This relocation describes which C++ vtable entries are actually 9290 used. Record for later use during GC. */ 9291 case R_ARM_GNU_VTENTRY: 9292 BFD_ASSERT (h != NULL); 9293 if (h != NULL 9294 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 9295 return FALSE; 9296 break; 9297 } 9298 } 9299 9300 return TRUE; 9301 } 9302 9303 /* Unwinding tables are not referenced directly. This pass marks them as 9304 required if the corresponding code section is marked. */ 9305 9306 static bfd_boolean 9307 elf32_arm_gc_mark_extra_sections (struct bfd_link_info *info, 9308 elf_gc_mark_hook_fn gc_mark_hook) 9309 { 9310 bfd *sub; 9311 Elf_Internal_Shdr **elf_shdrp; 9312 bfd_boolean again; 9313 9314 /* Marking EH data may cause additional code sections to be marked, 9315 requiring multiple passes. */ 9316 again = TRUE; 9317 while (again) 9318 { 9319 again = FALSE; 9320 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) 9321 { 9322 asection *o; 9323 9324 if (! is_arm_elf (sub)) 9325 continue; 9326 9327 elf_shdrp = elf_elfsections (sub); 9328 for (o = sub->sections; o != NULL; o = o->next) 9329 { 9330 Elf_Internal_Shdr *hdr; 9331 9332 hdr = &elf_section_data (o)->this_hdr; 9333 if (hdr->sh_type == SHT_ARM_EXIDX 9334 && hdr->sh_link 9335 && hdr->sh_link < elf_numsections (sub) 9336 && !o->gc_mark 9337 && elf_shdrp[hdr->sh_link]->bfd_section->gc_mark) 9338 { 9339 again = TRUE; 9340 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook)) 9341 return FALSE; 9342 } 9343 } 9344 } 9345 } 9346 9347 return TRUE; 9348 } 9349 9350 /* Treat mapping symbols as special target symbols. */ 9351 9352 static bfd_boolean 9353 elf32_arm_is_target_special_symbol (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym) 9354 { 9355 return bfd_is_arm_special_symbol_name (sym->name, 9356 BFD_ARM_SPECIAL_SYM_TYPE_ANY); 9357 } 9358 9359 /* This is a copy of elf_find_function() from elf.c except that 9360 ARM mapping symbols are ignored when looking for function names 9361 and STT_ARM_TFUNC is considered to a function type. */ 9362 9363 static bfd_boolean 9364 arm_elf_find_function (bfd * abfd ATTRIBUTE_UNUSED, 9365 asection * section, 9366 asymbol ** symbols, 9367 bfd_vma offset, 9368 const char ** filename_ptr, 9369 const char ** functionname_ptr) 9370 { 9371 const char * filename = NULL; 9372 asymbol * func = NULL; 9373 bfd_vma low_func = 0; 9374 asymbol ** p; 9375 9376 for (p = symbols; *p != NULL; p++) 9377 { 9378 elf_symbol_type *q; 9379 9380 q = (elf_symbol_type *) *p; 9381 9382 switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) 9383 { 9384 default: 9385 break; 9386 case STT_FILE: 9387 filename = bfd_asymbol_name (&q->symbol); 9388 break; 9389 case STT_FUNC: 9390 case STT_ARM_TFUNC: 9391 case STT_NOTYPE: 9392 /* Skip mapping symbols. */ 9393 if ((q->symbol.flags & BSF_LOCAL) 9394 && bfd_is_arm_special_symbol_name (q->symbol.name, 9395 BFD_ARM_SPECIAL_SYM_TYPE_ANY)) 9396 continue; 9397 /* Fall through. */ 9398 if (bfd_get_section (&q->symbol) == section 9399 && q->symbol.value >= low_func 9400 && q->symbol.value <= offset) 9401 { 9402 func = (asymbol *) q; 9403 low_func = q->symbol.value; 9404 } 9405 break; 9406 } 9407 } 9408 9409 if (func == NULL) 9410 return FALSE; 9411 9412 if (filename_ptr) 9413 *filename_ptr = filename; 9414 if (functionname_ptr) 9415 *functionname_ptr = bfd_asymbol_name (func); 9416 9417 return TRUE; 9418 } 9419 9420 9421 /* Find the nearest line to a particular section and offset, for error 9422 reporting. This code is a duplicate of the code in elf.c, except 9423 that it uses arm_elf_find_function. */ 9424 9425 static bfd_boolean 9426 elf32_arm_find_nearest_line (bfd * abfd, 9427 asection * section, 9428 asymbol ** symbols, 9429 bfd_vma offset, 9430 const char ** filename_ptr, 9431 const char ** functionname_ptr, 9432 unsigned int * line_ptr) 9433 { 9434 bfd_boolean found = FALSE; 9435 9436 /* We skip _bfd_dwarf1_find_nearest_line since no known ARM toolchain uses it. */ 9437 9438 if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, 9439 filename_ptr, functionname_ptr, 9440 line_ptr, 0, 9441 & elf_tdata (abfd)->dwarf2_find_line_info)) 9442 { 9443 if (!*functionname_ptr) 9444 arm_elf_find_function (abfd, section, symbols, offset, 9445 *filename_ptr ? NULL : filename_ptr, 9446 functionname_ptr); 9447 9448 return TRUE; 9449 } 9450 9451 if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, 9452 & found, filename_ptr, 9453 functionname_ptr, line_ptr, 9454 & elf_tdata (abfd)->line_info)) 9455 return FALSE; 9456 9457 if (found && (*functionname_ptr || *line_ptr)) 9458 return TRUE; 9459 9460 if (symbols == NULL) 9461 return FALSE; 9462 9463 if (! arm_elf_find_function (abfd, section, symbols, offset, 9464 filename_ptr, functionname_ptr)) 9465 return FALSE; 9466 9467 *line_ptr = 0; 9468 return TRUE; 9469 } 9470 9471 static bfd_boolean 9472 elf32_arm_find_inliner_info (bfd * abfd, 9473 const char ** filename_ptr, 9474 const char ** functionname_ptr, 9475 unsigned int * line_ptr) 9476 { 9477 bfd_boolean found; 9478 found = _bfd_dwarf2_find_inliner_info (abfd, filename_ptr, 9479 functionname_ptr, line_ptr, 9480 & elf_tdata (abfd)->dwarf2_find_line_info); 9481 return found; 9482 } 9483 9484 /* Adjust a symbol defined by a dynamic object and referenced by a 9485 regular object. The current definition is in some section of the 9486 dynamic object, but we're not including those sections. We have to 9487 change the definition to something the rest of the link can 9488 understand. */ 9489 9490 static bfd_boolean 9491 elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info, 9492 struct elf_link_hash_entry * h) 9493 { 9494 bfd * dynobj; 9495 asection * s; 9496 struct elf32_arm_link_hash_entry * eh; 9497 struct elf32_arm_link_hash_table *globals; 9498 9499 globals = elf32_arm_hash_table (info); 9500 dynobj = elf_hash_table (info)->dynobj; 9501 9502 /* Make sure we know what is going on here. */ 9503 BFD_ASSERT (dynobj != NULL 9504 && (h->needs_plt 9505 || h->u.weakdef != NULL 9506 || (h->def_dynamic 9507 && h->ref_regular 9508 && !h->def_regular))); 9509 9510 eh = (struct elf32_arm_link_hash_entry *) h; 9511 9512 /* If this is a function, put it in the procedure linkage table. We 9513 will fill in the contents of the procedure linkage table later, 9514 when we know the address of the .got section. */ 9515 if (h->type == STT_FUNC || h->type == STT_ARM_TFUNC 9516 || h->needs_plt) 9517 { 9518 if (h->plt.refcount <= 0 9519 || SYMBOL_CALLS_LOCAL (info, h) 9520 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 9521 && h->root.type == bfd_link_hash_undefweak)) 9522 { 9523 /* This case can occur if we saw a PLT32 reloc in an input 9524 file, but the symbol was never referred to by a dynamic 9525 object, or if all references were garbage collected. In 9526 such a case, we don't actually need to build a procedure 9527 linkage table, and we can just do a PC24 reloc instead. */ 9528 h->plt.offset = (bfd_vma) -1; 9529 eh->plt_thumb_refcount = 0; 9530 eh->plt_maybe_thumb_refcount = 0; 9531 h->needs_plt = 0; 9532 } 9533 9534 return TRUE; 9535 } 9536 else 9537 { 9538 /* It's possible that we incorrectly decided a .plt reloc was 9539 needed for an R_ARM_PC24 or similar reloc to a non-function sym 9540 in check_relocs. We can't decide accurately between function 9541 and non-function syms in check-relocs; Objects loaded later in 9542 the link may change h->type. So fix it now. */ 9543 h->plt.offset = (bfd_vma) -1; 9544 eh->plt_thumb_refcount = 0; 9545 eh->plt_maybe_thumb_refcount = 0; 9546 } 9547 9548 /* If this is a weak symbol, and there is a real definition, the 9549 processor independent code will have arranged for us to see the 9550 real definition first, and we can just use the same value. */ 9551 if (h->u.weakdef != NULL) 9552 { 9553 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 9554 || h->u.weakdef->root.type == bfd_link_hash_defweak); 9555 h->root.u.def.section = h->u.weakdef->root.u.def.section; 9556 h->root.u.def.value = h->u.weakdef->root.u.def.value; 9557 return TRUE; 9558 } 9559 9560 /* If there are no non-GOT references, we do not need a copy 9561 relocation. */ 9562 if (!h->non_got_ref) 9563 return TRUE; 9564 9565 /* This is a reference to a symbol defined by a dynamic object which 9566 is not a function. */ 9567 9568 /* If we are creating a shared library, we must presume that the 9569 only references to the symbol are via the global offset table. 9570 For such cases we need not do anything here; the relocations will 9571 be handled correctly by relocate_section. Relocatable executables 9572 can reference data in shared objects directly, so we don't need to 9573 do anything here. */ 9574 if (info->shared || globals->root.is_relocatable_executable) 9575 return TRUE; 9576 9577 if (h->size == 0) 9578 { 9579 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 9580 h->root.root.string); 9581 return TRUE; 9582 } 9583 9584 /* We must allocate the symbol in our .dynbss section, which will 9585 become part of the .bss section of the executable. There will be 9586 an entry for this symbol in the .dynsym section. The dynamic 9587 object will contain position independent code, so all references 9588 from the dynamic object to this symbol will go through the global 9589 offset table. The dynamic linker will use the .dynsym entry to 9590 determine the address it must put in the global offset table, so 9591 both the dynamic object and the regular object will refer to the 9592 same memory location for the variable. */ 9593 s = bfd_get_section_by_name (dynobj, ".dynbss"); 9594 BFD_ASSERT (s != NULL); 9595 9596 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to 9597 copy the initial value out of the dynamic object and into the 9598 runtime process image. We need to remember the offset into the 9599 .rel(a).bss section we are going to use. */ 9600 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 9601 { 9602 asection *srel; 9603 9604 srel = bfd_get_section_by_name (dynobj, RELOC_SECTION (globals, ".bss")); 9605 BFD_ASSERT (srel != NULL); 9606 srel->size += RELOC_SIZE (globals); 9607 h->needs_copy = 1; 9608 } 9609 9610 return _bfd_elf_adjust_dynamic_copy (h, s); 9611 } 9612 9613 /* Allocate space in .plt, .got and associated reloc sections for 9614 dynamic relocs. */ 9615 9616 static bfd_boolean 9617 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 9618 { 9619 struct bfd_link_info *info; 9620 struct elf32_arm_link_hash_table *htab; 9621 struct elf32_arm_link_hash_entry *eh; 9622 struct elf32_arm_relocs_copied *p; 9623 bfd_signed_vma thumb_refs; 9624 9625 eh = (struct elf32_arm_link_hash_entry *) h; 9626 9627 if (h->root.type == bfd_link_hash_indirect) 9628 return TRUE; 9629 9630 if (h->root.type == bfd_link_hash_warning) 9631 /* When warning symbols are created, they **replace** the "real" 9632 entry in the hash table, thus we never get to see the real 9633 symbol in a hash traversal. So look at it now. */ 9634 h = (struct elf_link_hash_entry *) h->root.u.i.link; 9635 9636 info = (struct bfd_link_info *) inf; 9637 htab = elf32_arm_hash_table (info); 9638 9639 if (htab->root.dynamic_sections_created 9640 && h->plt.refcount > 0) 9641 { 9642 /* Make sure this symbol is output as a dynamic symbol. 9643 Undefined weak syms won't yet be marked as dynamic. */ 9644 if (h->dynindx == -1 9645 && !h->forced_local) 9646 { 9647 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 9648 return FALSE; 9649 } 9650 9651 if (info->shared 9652 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 9653 { 9654 asection *s = htab->splt; 9655 9656 /* If this is the first .plt entry, make room for the special 9657 first entry. */ 9658 if (s->size == 0) 9659 s->size += htab->plt_header_size; 9660 9661 h->plt.offset = s->size; 9662 9663 /* If we will insert a Thumb trampoline before this PLT, leave room 9664 for it. */ 9665 thumb_refs = eh->plt_thumb_refcount; 9666 if (!htab->use_blx) 9667 thumb_refs += eh->plt_maybe_thumb_refcount; 9668 9669 if (thumb_refs > 0) 9670 { 9671 h->plt.offset += PLT_THUMB_STUB_SIZE; 9672 s->size += PLT_THUMB_STUB_SIZE; 9673 } 9674 9675 /* If this symbol is not defined in a regular file, and we are 9676 not generating a shared library, then set the symbol to this 9677 location in the .plt. This is required to make function 9678 pointers compare as equal between the normal executable and 9679 the shared library. */ 9680 if (! info->shared 9681 && !h->def_regular) 9682 { 9683 h->root.u.def.section = s; 9684 h->root.u.def.value = h->plt.offset; 9685 9686 /* Make sure the function is not marked as Thumb, in case 9687 it is the target of an ABS32 relocation, which will 9688 point to the PLT entry. */ 9689 if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC) 9690 h->type = ELF_ST_INFO (ELF_ST_BIND (h->type), STT_FUNC); 9691 } 9692 9693 /* Make room for this entry. */ 9694 s->size += htab->plt_entry_size; 9695 9696 if (!htab->symbian_p) 9697 { 9698 /* We also need to make an entry in the .got.plt section, which 9699 will be placed in the .got section by the linker script. */ 9700 eh->plt_got_offset = htab->sgotplt->size; 9701 htab->sgotplt->size += 4; 9702 } 9703 9704 /* We also need to make an entry in the .rel(a).plt section. */ 9705 htab->srelplt->size += RELOC_SIZE (htab); 9706 9707 /* VxWorks executables have a second set of relocations for 9708 each PLT entry. They go in a separate relocation section, 9709 which is processed by the kernel loader. */ 9710 if (htab->vxworks_p && !info->shared) 9711 { 9712 /* There is a relocation for the initial PLT entry: 9713 an R_ARM_32 relocation for _GLOBAL_OFFSET_TABLE_. */ 9714 if (h->plt.offset == htab->plt_header_size) 9715 htab->srelplt2->size += RELOC_SIZE (htab); 9716 9717 /* There are two extra relocations for each subsequent 9718 PLT entry: an R_ARM_32 relocation for the GOT entry, 9719 and an R_ARM_32 relocation for the PLT entry. */ 9720 htab->srelplt2->size += RELOC_SIZE (htab) * 2; 9721 } 9722 } 9723 else 9724 { 9725 h->plt.offset = (bfd_vma) -1; 9726 h->needs_plt = 0; 9727 } 9728 } 9729 else 9730 { 9731 h->plt.offset = (bfd_vma) -1; 9732 h->needs_plt = 0; 9733 } 9734 9735 if (h->got.refcount > 0) 9736 { 9737 asection *s; 9738 bfd_boolean dyn; 9739 int tls_type = elf32_arm_hash_entry (h)->tls_type; 9740 int indx; 9741 9742 /* Make sure this symbol is output as a dynamic symbol. 9743 Undefined weak syms won't yet be marked as dynamic. */ 9744 if (h->dynindx == -1 9745 && !h->forced_local) 9746 { 9747 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 9748 return FALSE; 9749 } 9750 9751 if (!htab->symbian_p) 9752 { 9753 s = htab->sgot; 9754 h->got.offset = s->size; 9755 9756 if (tls_type == GOT_UNKNOWN) 9757 abort (); 9758 9759 if (tls_type == GOT_NORMAL) 9760 /* Non-TLS symbols need one GOT slot. */ 9761 s->size += 4; 9762 else 9763 { 9764 if (tls_type & GOT_TLS_GD) 9765 /* R_ARM_TLS_GD32 needs 2 consecutive GOT slots. */ 9766 s->size += 8; 9767 if (tls_type & GOT_TLS_IE) 9768 /* R_ARM_TLS_IE32 needs one GOT slot. */ 9769 s->size += 4; 9770 } 9771 9772 dyn = htab->root.dynamic_sections_created; 9773 9774 indx = 0; 9775 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 9776 && (!info->shared 9777 || !SYMBOL_REFERENCES_LOCAL (info, h))) 9778 indx = h->dynindx; 9779 9780 if (tls_type != GOT_NORMAL 9781 && (info->shared || indx != 0) 9782 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 9783 || h->root.type != bfd_link_hash_undefweak)) 9784 { 9785 if (tls_type & GOT_TLS_IE) 9786 htab->srelgot->size += RELOC_SIZE (htab); 9787 9788 if (tls_type & GOT_TLS_GD) 9789 htab->srelgot->size += RELOC_SIZE (htab); 9790 9791 if ((tls_type & GOT_TLS_GD) && indx != 0) 9792 htab->srelgot->size += RELOC_SIZE (htab); 9793 } 9794 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 9795 || h->root.type != bfd_link_hash_undefweak) 9796 && (info->shared 9797 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 9798 htab->srelgot->size += RELOC_SIZE (htab); 9799 } 9800 } 9801 else 9802 h->got.offset = (bfd_vma) -1; 9803 9804 /* Allocate stubs for exported Thumb functions on v4t. */ 9805 if (!htab->use_blx && h->dynindx != -1 9806 && h->def_regular 9807 && ELF_ST_TYPE (h->type) == STT_ARM_TFUNC 9808 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 9809 { 9810 struct elf_link_hash_entry * th; 9811 struct bfd_link_hash_entry * bh; 9812 struct elf_link_hash_entry * myh; 9813 char name[1024]; 9814 asection *s; 9815 bh = NULL; 9816 /* Create a new symbol to regist the real location of the function. */ 9817 s = h->root.u.def.section; 9818 sprintf (name, "__real_%s", h->root.root.string); 9819 _bfd_generic_link_add_one_symbol (info, s->owner, 9820 name, BSF_GLOBAL, s, 9821 h->root.u.def.value, 9822 NULL, TRUE, FALSE, &bh); 9823 9824 myh = (struct elf_link_hash_entry *) bh; 9825 myh->type = ELF_ST_INFO (STB_LOCAL, STT_ARM_TFUNC); 9826 myh->forced_local = 1; 9827 eh->export_glue = myh; 9828 th = record_arm_to_thumb_glue (info, h); 9829 /* Point the symbol at the stub. */ 9830 h->type = ELF_ST_INFO (ELF_ST_BIND (h->type), STT_FUNC); 9831 h->root.u.def.section = th->root.u.def.section; 9832 h->root.u.def.value = th->root.u.def.value & ~1; 9833 } 9834 9835 if (eh->relocs_copied == NULL) 9836 return TRUE; 9837 9838 /* In the shared -Bsymbolic case, discard space allocated for 9839 dynamic pc-relative relocs against symbols which turn out to be 9840 defined in regular objects. For the normal shared case, discard 9841 space for pc-relative relocs that have become local due to symbol 9842 visibility changes. */ 9843 9844 if (info->shared || htab->root.is_relocatable_executable) 9845 { 9846 /* The only relocs that use pc_count are R_ARM_REL32 and 9847 R_ARM_REL32_NOI, which will appear on something like 9848 ".long foo - .". We want calls to protected symbols to resolve 9849 directly to the function rather than going via the plt. If people 9850 want function pointer comparisons to work as expected then they 9851 should avoid writing assembly like ".long foo - .". */ 9852 if (SYMBOL_CALLS_LOCAL (info, h)) 9853 { 9854 struct elf32_arm_relocs_copied **pp; 9855 9856 for (pp = &eh->relocs_copied; (p = *pp) != NULL; ) 9857 { 9858 p->count -= p->pc_count; 9859 p->pc_count = 0; 9860 if (p->count == 0) 9861 *pp = p->next; 9862 else 9863 pp = &p->next; 9864 } 9865 } 9866 9867 if (elf32_arm_hash_table (info)->vxworks_p) 9868 { 9869 struct elf32_arm_relocs_copied **pp; 9870 9871 for (pp = &eh->relocs_copied; (p = *pp) != NULL; ) 9872 { 9873 if (strcmp (p->section->output_section->name, ".tls_vars") == 0) 9874 *pp = p->next; 9875 else 9876 pp = &p->next; 9877 } 9878 } 9879 9880 /* Also discard relocs on undefined weak syms with non-default 9881 visibility. */ 9882 if (eh->relocs_copied != NULL 9883 && h->root.type == bfd_link_hash_undefweak) 9884 { 9885 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 9886 eh->relocs_copied = NULL; 9887 9888 /* Make sure undefined weak symbols are output as a dynamic 9889 symbol in PIEs. */ 9890 else if (h->dynindx == -1 9891 && !h->forced_local) 9892 { 9893 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 9894 return FALSE; 9895 } 9896 } 9897 9898 else if (htab->root.is_relocatable_executable && h->dynindx == -1 9899 && h->root.type == bfd_link_hash_new) 9900 { 9901 /* Output absolute symbols so that we can create relocations 9902 against them. For normal symbols we output a relocation 9903 against the section that contains them. */ 9904 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 9905 return FALSE; 9906 } 9907 9908 } 9909 else 9910 { 9911 /* For the non-shared case, discard space for relocs against 9912 symbols which turn out to need copy relocs or are not 9913 dynamic. */ 9914 9915 if (!h->non_got_ref 9916 && ((h->def_dynamic 9917 && !h->def_regular) 9918 || (htab->root.dynamic_sections_created 9919 && (h->root.type == bfd_link_hash_undefweak 9920 || h->root.type == bfd_link_hash_undefined)))) 9921 { 9922 /* Make sure this symbol is output as a dynamic symbol. 9923 Undefined weak syms won't yet be marked as dynamic. */ 9924 if (h->dynindx == -1 9925 && !h->forced_local) 9926 { 9927 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 9928 return FALSE; 9929 } 9930 9931 /* If that succeeded, we know we'll be keeping all the 9932 relocs. */ 9933 if (h->dynindx != -1) 9934 goto keep; 9935 } 9936 9937 eh->relocs_copied = NULL; 9938 9939 keep: ; 9940 } 9941 9942 /* Finally, allocate space. */ 9943 for (p = eh->relocs_copied; p != NULL; p = p->next) 9944 { 9945 asection *sreloc = elf_section_data (p->section)->sreloc; 9946 sreloc->size += p->count * RELOC_SIZE (htab); 9947 } 9948 9949 return TRUE; 9950 } 9951 9952 /* Find any dynamic relocs that apply to read-only sections. */ 9953 9954 static bfd_boolean 9955 elf32_arm_readonly_dynrelocs (struct elf_link_hash_entry * h, void * inf) 9956 { 9957 struct elf32_arm_link_hash_entry * eh; 9958 struct elf32_arm_relocs_copied * p; 9959 9960 if (h->root.type == bfd_link_hash_warning) 9961 h = (struct elf_link_hash_entry *) h->root.u.i.link; 9962 9963 eh = (struct elf32_arm_link_hash_entry *) h; 9964 for (p = eh->relocs_copied; p != NULL; p = p->next) 9965 { 9966 asection *s = p->section; 9967 9968 if (s != NULL && (s->flags & SEC_READONLY) != 0) 9969 { 9970 struct bfd_link_info *info = (struct bfd_link_info *) inf; 9971 9972 if (info->warn_shared_textrel) 9973 (*_bfd_error_handler) 9974 (_("warning: dynamic relocation in readonly section `%s'"), 9975 h->root.root.string); 9976 info->flags |= DF_TEXTREL; 9977 9978 /* Not an error, just cut short the traversal. */ 9979 return FALSE; 9980 } 9981 } 9982 return TRUE; 9983 } 9984 9985 void 9986 bfd_elf32_arm_set_byteswap_code (struct bfd_link_info *info, 9987 int byteswap_code) 9988 { 9989 struct elf32_arm_link_hash_table *globals; 9990 9991 globals = elf32_arm_hash_table (info); 9992 globals->byteswap_code = byteswap_code; 9993 } 9994 9995 /* Set the sizes of the dynamic sections. */ 9996 9997 static bfd_boolean 9998 elf32_arm_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, 9999 struct bfd_link_info * info) 10000 { 10001 bfd * dynobj; 10002 asection * s; 10003 bfd_boolean plt; 10004 bfd_boolean relocs; 10005 bfd *ibfd; 10006 struct elf32_arm_link_hash_table *htab; 10007 10008 htab = elf32_arm_hash_table (info); 10009 dynobj = elf_hash_table (info)->dynobj; 10010 BFD_ASSERT (dynobj != NULL); 10011 check_use_blx (htab); 10012 10013 if (elf_hash_table (info)->dynamic_sections_created) 10014 { 10015 /* Set the contents of the .interp section to the interpreter. */ 10016 if (info->executable) 10017 { 10018 s = bfd_get_section_by_name (dynobj, ".interp"); 10019 BFD_ASSERT (s != NULL); 10020 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 10021 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 10022 } 10023 } 10024 10025 /* Set up .got offsets for local syms, and space for local dynamic 10026 relocs. */ 10027 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 10028 { 10029 bfd_signed_vma *local_got; 10030 bfd_signed_vma *end_local_got; 10031 char *local_tls_type; 10032 bfd_size_type locsymcount; 10033 Elf_Internal_Shdr *symtab_hdr; 10034 asection *srel; 10035 bfd_boolean is_vxworks = elf32_arm_hash_table (info)->vxworks_p; 10036 10037 if (! is_arm_elf (ibfd)) 10038 continue; 10039 10040 for (s = ibfd->sections; s != NULL; s = s->next) 10041 { 10042 struct elf32_arm_relocs_copied *p; 10043 10044 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 10045 { 10046 if (!bfd_is_abs_section (p->section) 10047 && bfd_is_abs_section (p->section->output_section)) 10048 { 10049 /* Input section has been discarded, either because 10050 it is a copy of a linkonce section or due to 10051 linker script /DISCARD/, so we'll be discarding 10052 the relocs too. */ 10053 } 10054 else if (is_vxworks 10055 && strcmp (p->section->output_section->name, 10056 ".tls_vars") == 0) 10057 { 10058 /* Relocations in vxworks .tls_vars sections are 10059 handled specially by the loader. */ 10060 } 10061 else if (p->count != 0) 10062 { 10063 srel = elf_section_data (p->section)->sreloc; 10064 srel->size += p->count * RELOC_SIZE (htab); 10065 if ((p->section->output_section->flags & SEC_READONLY) != 0) 10066 info->flags |= DF_TEXTREL; 10067 } 10068 } 10069 } 10070 10071 local_got = elf_local_got_refcounts (ibfd); 10072 if (!local_got) 10073 continue; 10074 10075 symtab_hdr = & elf_symtab_hdr (ibfd); 10076 locsymcount = symtab_hdr->sh_info; 10077 end_local_got = local_got + locsymcount; 10078 local_tls_type = elf32_arm_local_got_tls_type (ibfd); 10079 s = htab->sgot; 10080 srel = htab->srelgot; 10081 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 10082 { 10083 if (*local_got > 0) 10084 { 10085 *local_got = s->size; 10086 if (*local_tls_type & GOT_TLS_GD) 10087 /* TLS_GD relocs need an 8-byte structure in the GOT. */ 10088 s->size += 8; 10089 if (*local_tls_type & GOT_TLS_IE) 10090 s->size += 4; 10091 if (*local_tls_type == GOT_NORMAL) 10092 s->size += 4; 10093 10094 if (info->shared || *local_tls_type == GOT_TLS_GD) 10095 srel->size += RELOC_SIZE (htab); 10096 } 10097 else 10098 *local_got = (bfd_vma) -1; 10099 } 10100 } 10101 10102 if (htab->tls_ldm_got.refcount > 0) 10103 { 10104 /* Allocate two GOT entries and one dynamic relocation (if necessary) 10105 for R_ARM_TLS_LDM32 relocations. */ 10106 htab->tls_ldm_got.offset = htab->sgot->size; 10107 htab->sgot->size += 8; 10108 if (info->shared) 10109 htab->srelgot->size += RELOC_SIZE (htab); 10110 } 10111 else 10112 htab->tls_ldm_got.offset = -1; 10113 10114 /* Allocate global sym .plt and .got entries, and space for global 10115 sym dynamic relocs. */ 10116 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info); 10117 10118 /* Here we rummage through the found bfds to collect glue information. */ 10119 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 10120 { 10121 if (! is_arm_elf (ibfd)) 10122 continue; 10123 10124 /* Initialise mapping tables for code/data. */ 10125 bfd_elf32_arm_init_maps (ibfd); 10126 10127 if (!bfd_elf32_arm_process_before_allocation (ibfd, info) 10128 || !bfd_elf32_arm_vfp11_erratum_scan (ibfd, info)) 10129 /* xgettext:c-format */ 10130 _bfd_error_handler (_("Errors encountered processing file %s"), 10131 ibfd->filename); 10132 } 10133 10134 /* The check_relocs and adjust_dynamic_symbol entry points have 10135 determined the sizes of the various dynamic sections. Allocate 10136 memory for them. */ 10137 plt = FALSE; 10138 relocs = FALSE; 10139 for (s = dynobj->sections; s != NULL; s = s->next) 10140 { 10141 const char * name; 10142 10143 if ((s->flags & SEC_LINKER_CREATED) == 0) 10144 continue; 10145 10146 /* It's OK to base decisions on the section name, because none 10147 of the dynobj section names depend upon the input files. */ 10148 name = bfd_get_section_name (dynobj, s); 10149 10150 if (strcmp (name, ".plt") == 0) 10151 { 10152 /* Remember whether there is a PLT. */ 10153 plt = s->size != 0; 10154 } 10155 else if (CONST_STRNEQ (name, ".rel")) 10156 { 10157 if (s->size != 0) 10158 { 10159 /* Remember whether there are any reloc sections other 10160 than .rel(a).plt and .rela.plt.unloaded. */ 10161 if (s != htab->srelplt && s != htab->srelplt2) 10162 relocs = TRUE; 10163 10164 /* We use the reloc_count field as a counter if we need 10165 to copy relocs into the output file. */ 10166 s->reloc_count = 0; 10167 } 10168 } 10169 else if (! CONST_STRNEQ (name, ".got") 10170 && strcmp (name, ".dynbss") != 0) 10171 { 10172 /* It's not one of our sections, so don't allocate space. */ 10173 continue; 10174 } 10175 10176 if (s->size == 0) 10177 { 10178 /* If we don't need this section, strip it from the 10179 output file. This is mostly to handle .rel(a).bss and 10180 .rel(a).plt. We must create both sections in 10181 create_dynamic_sections, because they must be created 10182 before the linker maps input sections to output 10183 sections. The linker does that before 10184 adjust_dynamic_symbol is called, and it is that 10185 function which decides whether anything needs to go 10186 into these sections. */ 10187 s->flags |= SEC_EXCLUDE; 10188 continue; 10189 } 10190 10191 if ((s->flags & SEC_HAS_CONTENTS) == 0) 10192 continue; 10193 10194 /* Allocate memory for the section contents. */ 10195 s->contents = bfd_zalloc (dynobj, s->size); 10196 if (s->contents == NULL) 10197 return FALSE; 10198 } 10199 10200 if (elf_hash_table (info)->dynamic_sections_created) 10201 { 10202 /* Add some entries to the .dynamic section. We fill in the 10203 values later, in elf32_arm_finish_dynamic_sections, but we 10204 must add the entries now so that we get the correct size for 10205 the .dynamic section. The DT_DEBUG entry is filled in by the 10206 dynamic linker and used by the debugger. */ 10207 #define add_dynamic_entry(TAG, VAL) \ 10208 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 10209 10210 if (info->executable) 10211 { 10212 if (!add_dynamic_entry (DT_DEBUG, 0)) 10213 return FALSE; 10214 } 10215 10216 if (plt) 10217 { 10218 if ( !add_dynamic_entry (DT_PLTGOT, 0) 10219 || !add_dynamic_entry (DT_PLTRELSZ, 0) 10220 || !add_dynamic_entry (DT_PLTREL, 10221 htab->use_rel ? DT_REL : DT_RELA) 10222 || !add_dynamic_entry (DT_JMPREL, 0)) 10223 return FALSE; 10224 } 10225 10226 if (relocs) 10227 { 10228 if (htab->use_rel) 10229 { 10230 if (!add_dynamic_entry (DT_REL, 0) 10231 || !add_dynamic_entry (DT_RELSZ, 0) 10232 || !add_dynamic_entry (DT_RELENT, RELOC_SIZE (htab))) 10233 return FALSE; 10234 } 10235 else 10236 { 10237 if (!add_dynamic_entry (DT_RELA, 0) 10238 || !add_dynamic_entry (DT_RELASZ, 0) 10239 || !add_dynamic_entry (DT_RELAENT, RELOC_SIZE (htab))) 10240 return FALSE; 10241 } 10242 } 10243 10244 /* If any dynamic relocs apply to a read-only section, 10245 then we need a DT_TEXTREL entry. */ 10246 if ((info->flags & DF_TEXTREL) == 0) 10247 elf_link_hash_traverse (& htab->root, elf32_arm_readonly_dynrelocs, 10248 info); 10249 10250 if ((info->flags & DF_TEXTREL) != 0) 10251 { 10252 if (!add_dynamic_entry (DT_TEXTREL, 0)) 10253 return FALSE; 10254 } 10255 if (htab->vxworks_p 10256 && !elf_vxworks_add_dynamic_entries (output_bfd, info)) 10257 return FALSE; 10258 } 10259 #undef add_dynamic_entry 10260 10261 return TRUE; 10262 } 10263 10264 /* Finish up dynamic symbol handling. We set the contents of various 10265 dynamic sections here. */ 10266 10267 static bfd_boolean 10268 elf32_arm_finish_dynamic_symbol (bfd * output_bfd, 10269 struct bfd_link_info * info, 10270 struct elf_link_hash_entry * h, 10271 Elf_Internal_Sym * sym) 10272 { 10273 bfd * dynobj; 10274 struct elf32_arm_link_hash_table *htab; 10275 struct elf32_arm_link_hash_entry *eh; 10276 10277 dynobj = elf_hash_table (info)->dynobj; 10278 htab = elf32_arm_hash_table (info); 10279 eh = (struct elf32_arm_link_hash_entry *) h; 10280 10281 if (h->plt.offset != (bfd_vma) -1) 10282 { 10283 asection * splt; 10284 asection * srel; 10285 bfd_byte *loc; 10286 bfd_vma plt_index; 10287 Elf_Internal_Rela rel; 10288 10289 /* This symbol has an entry in the procedure linkage table. Set 10290 it up. */ 10291 10292 BFD_ASSERT (h->dynindx != -1); 10293 10294 splt = bfd_get_section_by_name (dynobj, ".plt"); 10295 srel = bfd_get_section_by_name (dynobj, RELOC_SECTION (htab, ".plt")); 10296 BFD_ASSERT (splt != NULL && srel != NULL); 10297 10298 /* Fill in the entry in the procedure linkage table. */ 10299 if (htab->symbian_p) 10300 { 10301 put_arm_insn (htab, output_bfd, 10302 elf32_arm_symbian_plt_entry[0], 10303 splt->contents + h->plt.offset); 10304 bfd_put_32 (output_bfd, 10305 elf32_arm_symbian_plt_entry[1], 10306 splt->contents + h->plt.offset + 4); 10307 10308 /* Fill in the entry in the .rel.plt section. */ 10309 rel.r_offset = (splt->output_section->vma 10310 + splt->output_offset 10311 + h->plt.offset + 4); 10312 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); 10313 10314 /* Get the index in the procedure linkage table which 10315 corresponds to this symbol. This is the index of this symbol 10316 in all the symbols for which we are making plt entries. The 10317 first entry in the procedure linkage table is reserved. */ 10318 plt_index = ((h->plt.offset - htab->plt_header_size) 10319 / htab->plt_entry_size); 10320 } 10321 else 10322 { 10323 bfd_vma got_offset, got_address, plt_address; 10324 bfd_vma got_displacement; 10325 asection * sgot; 10326 bfd_byte * ptr; 10327 10328 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 10329 BFD_ASSERT (sgot != NULL); 10330 10331 /* Get the offset into the .got.plt table of the entry that 10332 corresponds to this function. */ 10333 got_offset = eh->plt_got_offset; 10334 10335 /* Get the index in the procedure linkage table which 10336 corresponds to this symbol. This is the index of this symbol 10337 in all the symbols for which we are making plt entries. The 10338 first three entries in .got.plt are reserved; after that 10339 symbols appear in the same order as in .plt. */ 10340 plt_index = (got_offset - 12) / 4; 10341 10342 /* Calculate the address of the GOT entry. */ 10343 got_address = (sgot->output_section->vma 10344 + sgot->output_offset 10345 + got_offset); 10346 10347 /* ...and the address of the PLT entry. */ 10348 plt_address = (splt->output_section->vma 10349 + splt->output_offset 10350 + h->plt.offset); 10351 10352 ptr = htab->splt->contents + h->plt.offset; 10353 if (htab->vxworks_p && info->shared) 10354 { 10355 unsigned int i; 10356 bfd_vma val; 10357 10358 for (i = 0; i != htab->plt_entry_size / 4; i++, ptr += 4) 10359 { 10360 val = elf32_arm_vxworks_shared_plt_entry[i]; 10361 if (i == 2) 10362 val |= got_address - sgot->output_section->vma; 10363 if (i == 5) 10364 val |= plt_index * RELOC_SIZE (htab); 10365 if (i == 2 || i == 5) 10366 bfd_put_32 (output_bfd, val, ptr); 10367 else 10368 put_arm_insn (htab, output_bfd, val, ptr); 10369 } 10370 } 10371 else if (htab->vxworks_p) 10372 { 10373 unsigned int i; 10374 bfd_vma val; 10375 10376 for (i = 0; i != htab->plt_entry_size / 4; i++, ptr += 4) 10377 { 10378 val = elf32_arm_vxworks_exec_plt_entry[i]; 10379 if (i == 2) 10380 val |= got_address; 10381 if (i == 4) 10382 val |= 0xffffff & -((h->plt.offset + i * 4 + 8) >> 2); 10383 if (i == 5) 10384 val |= plt_index * RELOC_SIZE (htab); 10385 if (i == 2 || i == 5) 10386 bfd_put_32 (output_bfd, val, ptr); 10387 else 10388 put_arm_insn (htab, output_bfd, val, ptr); 10389 } 10390 10391 loc = (htab->srelplt2->contents 10392 + (plt_index * 2 + 1) * RELOC_SIZE (htab)); 10393 10394 /* Create the .rela.plt.unloaded R_ARM_ABS32 relocation 10395 referencing the GOT for this PLT entry. */ 10396 rel.r_offset = plt_address + 8; 10397 rel.r_info = ELF32_R_INFO (htab->root.hgot->indx, R_ARM_ABS32); 10398 rel.r_addend = got_offset; 10399 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 10400 loc += RELOC_SIZE (htab); 10401 10402 /* Create the R_ARM_ABS32 relocation referencing the 10403 beginning of the PLT for this GOT entry. */ 10404 rel.r_offset = got_address; 10405 rel.r_info = ELF32_R_INFO (htab->root.hplt->indx, R_ARM_ABS32); 10406 rel.r_addend = 0; 10407 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 10408 } 10409 else 10410 { 10411 bfd_signed_vma thumb_refs; 10412 /* Calculate the displacement between the PLT slot and the 10413 entry in the GOT. The eight-byte offset accounts for the 10414 value produced by adding to pc in the first instruction 10415 of the PLT stub. */ 10416 got_displacement = got_address - (plt_address + 8); 10417 10418 BFD_ASSERT ((got_displacement & 0xf0000000) == 0); 10419 10420 thumb_refs = eh->plt_thumb_refcount; 10421 if (!htab->use_blx) 10422 thumb_refs += eh->plt_maybe_thumb_refcount; 10423 10424 if (thumb_refs > 0) 10425 { 10426 put_thumb_insn (htab, output_bfd, 10427 elf32_arm_plt_thumb_stub[0], ptr - 4); 10428 put_thumb_insn (htab, output_bfd, 10429 elf32_arm_plt_thumb_stub[1], ptr - 2); 10430 } 10431 10432 put_arm_insn (htab, output_bfd, 10433 elf32_arm_plt_entry[0] 10434 | ((got_displacement & 0x0ff00000) >> 20), 10435 ptr + 0); 10436 put_arm_insn (htab, output_bfd, 10437 elf32_arm_plt_entry[1] 10438 | ((got_displacement & 0x000ff000) >> 12), 10439 ptr+ 4); 10440 put_arm_insn (htab, output_bfd, 10441 elf32_arm_plt_entry[2] 10442 | (got_displacement & 0x00000fff), 10443 ptr + 8); 10444 #ifdef FOUR_WORD_PLT 10445 bfd_put_32 (output_bfd, elf32_arm_plt_entry[3], ptr + 12); 10446 #endif 10447 } 10448 10449 /* Fill in the entry in the global offset table. */ 10450 bfd_put_32 (output_bfd, 10451 (splt->output_section->vma 10452 + splt->output_offset), 10453 sgot->contents + got_offset); 10454 10455 /* Fill in the entry in the .rel(a).plt section. */ 10456 rel.r_addend = 0; 10457 rel.r_offset = got_address; 10458 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); 10459 } 10460 10461 loc = srel->contents + plt_index * RELOC_SIZE (htab); 10462 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 10463 10464 if (!h->def_regular) 10465 { 10466 /* Mark the symbol as undefined, rather than as defined in 10467 the .plt section. Leave the value alone. */ 10468 sym->st_shndx = SHN_UNDEF; 10469 /* If the symbol is weak, we do need to clear the value. 10470 Otherwise, the PLT entry would provide a definition for 10471 the symbol even if the symbol wasn't defined anywhere, 10472 and so the symbol would never be NULL. */ 10473 if (!h->ref_regular_nonweak) 10474 sym->st_value = 0; 10475 } 10476 } 10477 10478 if (h->got.offset != (bfd_vma) -1 10479 && (elf32_arm_hash_entry (h)->tls_type & GOT_TLS_GD) == 0 10480 && (elf32_arm_hash_entry (h)->tls_type & GOT_TLS_IE) == 0) 10481 { 10482 asection * sgot; 10483 asection * srel; 10484 Elf_Internal_Rela rel; 10485 bfd_byte *loc; 10486 bfd_vma offset; 10487 10488 /* This symbol has an entry in the global offset table. Set it 10489 up. */ 10490 sgot = bfd_get_section_by_name (dynobj, ".got"); 10491 srel = bfd_get_section_by_name (dynobj, RELOC_SECTION (htab, ".got")); 10492 BFD_ASSERT (sgot != NULL && srel != NULL); 10493 10494 offset = (h->got.offset & ~(bfd_vma) 1); 10495 rel.r_addend = 0; 10496 rel.r_offset = (sgot->output_section->vma 10497 + sgot->output_offset 10498 + offset); 10499 10500 /* If this is a static link, or it is a -Bsymbolic link and the 10501 symbol is defined locally or was forced to be local because 10502 of a version file, we just want to emit a RELATIVE reloc. 10503 The entry in the global offset table will already have been 10504 initialized in the relocate_section function. */ 10505 if (info->shared 10506 && SYMBOL_REFERENCES_LOCAL (info, h)) 10507 { 10508 BFD_ASSERT ((h->got.offset & 1) != 0); 10509 rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); 10510 if (!htab->use_rel) 10511 { 10512 rel.r_addend = bfd_get_32 (output_bfd, sgot->contents + offset); 10513 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + offset); 10514 } 10515 } 10516 else 10517 { 10518 BFD_ASSERT ((h->got.offset & 1) == 0); 10519 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + offset); 10520 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); 10521 } 10522 10523 loc = srel->contents + srel->reloc_count++ * RELOC_SIZE (htab); 10524 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 10525 } 10526 10527 if (h->needs_copy) 10528 { 10529 asection * s; 10530 Elf_Internal_Rela rel; 10531 bfd_byte *loc; 10532 10533 /* This symbol needs a copy reloc. Set it up. */ 10534 BFD_ASSERT (h->dynindx != -1 10535 && (h->root.type == bfd_link_hash_defined 10536 || h->root.type == bfd_link_hash_defweak)); 10537 10538 s = bfd_get_section_by_name (h->root.u.def.section->owner, 10539 RELOC_SECTION (htab, ".bss")); 10540 BFD_ASSERT (s != NULL); 10541 10542 rel.r_addend = 0; 10543 rel.r_offset = (h->root.u.def.value 10544 + h->root.u.def.section->output_section->vma 10545 + h->root.u.def.section->output_offset); 10546 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); 10547 loc = s->contents + s->reloc_count++ * RELOC_SIZE (htab); 10548 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 10549 } 10550 10551 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. On VxWorks, 10552 the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it is relative 10553 to the ".got" section. */ 10554 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 10555 || (!htab->vxworks_p && h == htab->root.hgot)) 10556 sym->st_shndx = SHN_ABS; 10557 10558 return TRUE; 10559 } 10560 10561 /* Finish up the dynamic sections. */ 10562 10563 static bfd_boolean 10564 elf32_arm_finish_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info) 10565 { 10566 bfd * dynobj; 10567 asection * sgot; 10568 asection * sdyn; 10569 10570 dynobj = elf_hash_table (info)->dynobj; 10571 10572 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 10573 BFD_ASSERT (elf32_arm_hash_table (info)->symbian_p || sgot != NULL); 10574 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 10575 10576 if (elf_hash_table (info)->dynamic_sections_created) 10577 { 10578 asection *splt; 10579 Elf32_External_Dyn *dyncon, *dynconend; 10580 struct elf32_arm_link_hash_table *htab; 10581 10582 htab = elf32_arm_hash_table (info); 10583 splt = bfd_get_section_by_name (dynobj, ".plt"); 10584 BFD_ASSERT (splt != NULL && sdyn != NULL); 10585 10586 dyncon = (Elf32_External_Dyn *) sdyn->contents; 10587 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 10588 10589 for (; dyncon < dynconend; dyncon++) 10590 { 10591 Elf_Internal_Dyn dyn; 10592 const char * name; 10593 asection * s; 10594 10595 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 10596 10597 switch (dyn.d_tag) 10598 { 10599 unsigned int type; 10600 10601 default: 10602 if (htab->vxworks_p 10603 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn)) 10604 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 10605 break; 10606 10607 case DT_HASH: 10608 name = ".hash"; 10609 goto get_vma_if_bpabi; 10610 case DT_STRTAB: 10611 name = ".dynstr"; 10612 goto get_vma_if_bpabi; 10613 case DT_SYMTAB: 10614 name = ".dynsym"; 10615 goto get_vma_if_bpabi; 10616 case DT_VERSYM: 10617 name = ".gnu.version"; 10618 goto get_vma_if_bpabi; 10619 case DT_VERDEF: 10620 name = ".gnu.version_d"; 10621 goto get_vma_if_bpabi; 10622 case DT_VERNEED: 10623 name = ".gnu.version_r"; 10624 goto get_vma_if_bpabi; 10625 10626 case DT_PLTGOT: 10627 name = ".got"; 10628 goto get_vma; 10629 case DT_JMPREL: 10630 name = RELOC_SECTION (htab, ".plt"); 10631 get_vma: 10632 s = bfd_get_section_by_name (output_bfd, name); 10633 BFD_ASSERT (s != NULL); 10634 if (!htab->symbian_p) 10635 dyn.d_un.d_ptr = s->vma; 10636 else 10637 /* In the BPABI, tags in the PT_DYNAMIC section point 10638 at the file offset, not the memory address, for the 10639 convenience of the post linker. */ 10640 dyn.d_un.d_ptr = s->filepos; 10641 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 10642 break; 10643 10644 get_vma_if_bpabi: 10645 if (htab->symbian_p) 10646 goto get_vma; 10647 break; 10648 10649 case DT_PLTRELSZ: 10650 s = bfd_get_section_by_name (output_bfd, 10651 RELOC_SECTION (htab, ".plt")); 10652 BFD_ASSERT (s != NULL); 10653 dyn.d_un.d_val = s->size; 10654 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 10655 break; 10656 10657 case DT_RELSZ: 10658 case DT_RELASZ: 10659 if (!htab->symbian_p) 10660 { 10661 /* My reading of the SVR4 ABI indicates that the 10662 procedure linkage table relocs (DT_JMPREL) should be 10663 included in the overall relocs (DT_REL). This is 10664 what Solaris does. However, UnixWare can not handle 10665 that case. Therefore, we override the DT_RELSZ entry 10666 here to make it not include the JMPREL relocs. Since 10667 the linker script arranges for .rel(a).plt to follow all 10668 other relocation sections, we don't have to worry 10669 about changing the DT_REL entry. */ 10670 s = bfd_get_section_by_name (output_bfd, 10671 RELOC_SECTION (htab, ".plt")); 10672 if (s != NULL) 10673 dyn.d_un.d_val -= s->size; 10674 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 10675 break; 10676 } 10677 /* Fall through. */ 10678 10679 case DT_REL: 10680 case DT_RELA: 10681 /* In the BPABI, the DT_REL tag must point at the file 10682 offset, not the VMA, of the first relocation 10683 section. So, we use code similar to that in 10684 elflink.c, but do not check for SHF_ALLOC on the 10685 relcoation section, since relocations sections are 10686 never allocated under the BPABI. The comments above 10687 about Unixware notwithstanding, we include all of the 10688 relocations here. */ 10689 if (htab->symbian_p) 10690 { 10691 unsigned int i; 10692 type = ((dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ) 10693 ? SHT_REL : SHT_RELA); 10694 dyn.d_un.d_val = 0; 10695 for (i = 1; i < elf_numsections (output_bfd); i++) 10696 { 10697 Elf_Internal_Shdr *hdr 10698 = elf_elfsections (output_bfd)[i]; 10699 if (hdr->sh_type == type) 10700 { 10701 if (dyn.d_tag == DT_RELSZ 10702 || dyn.d_tag == DT_RELASZ) 10703 dyn.d_un.d_val += hdr->sh_size; 10704 else if ((ufile_ptr) hdr->sh_offset 10705 <= dyn.d_un.d_val - 1) 10706 dyn.d_un.d_val = hdr->sh_offset; 10707 } 10708 } 10709 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 10710 } 10711 break; 10712 10713 /* Set the bottom bit of DT_INIT/FINI if the 10714 corresponding function is Thumb. */ 10715 case DT_INIT: 10716 name = info->init_function; 10717 goto get_sym; 10718 case DT_FINI: 10719 name = info->fini_function; 10720 get_sym: 10721 /* If it wasn't set by elf_bfd_final_link 10722 then there is nothing to adjust. */ 10723 if (dyn.d_un.d_val != 0) 10724 { 10725 struct elf_link_hash_entry * eh; 10726 10727 eh = elf_link_hash_lookup (elf_hash_table (info), name, 10728 FALSE, FALSE, TRUE); 10729 if (eh != NULL 10730 && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC) 10731 { 10732 dyn.d_un.d_val |= 1; 10733 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 10734 } 10735 } 10736 break; 10737 } 10738 } 10739 10740 /* Fill in the first entry in the procedure linkage table. */ 10741 if (splt->size > 0 && elf32_arm_hash_table (info)->plt_header_size) 10742 { 10743 const bfd_vma *plt0_entry; 10744 bfd_vma got_address, plt_address, got_displacement; 10745 10746 /* Calculate the addresses of the GOT and PLT. */ 10747 got_address = sgot->output_section->vma + sgot->output_offset; 10748 plt_address = splt->output_section->vma + splt->output_offset; 10749 10750 if (htab->vxworks_p) 10751 { 10752 /* The VxWorks GOT is relocated by the dynamic linker. 10753 Therefore, we must emit relocations rather than simply 10754 computing the values now. */ 10755 Elf_Internal_Rela rel; 10756 10757 plt0_entry = elf32_arm_vxworks_exec_plt0_entry; 10758 put_arm_insn (htab, output_bfd, plt0_entry[0], 10759 splt->contents + 0); 10760 put_arm_insn (htab, output_bfd, plt0_entry[1], 10761 splt->contents + 4); 10762 put_arm_insn (htab, output_bfd, plt0_entry[2], 10763 splt->contents + 8); 10764 bfd_put_32 (output_bfd, got_address, splt->contents + 12); 10765 10766 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_. */ 10767 rel.r_offset = plt_address + 12; 10768 rel.r_info = ELF32_R_INFO (htab->root.hgot->indx, R_ARM_ABS32); 10769 rel.r_addend = 0; 10770 SWAP_RELOC_OUT (htab) (output_bfd, &rel, 10771 htab->srelplt2->contents); 10772 } 10773 else 10774 { 10775 got_displacement = got_address - (plt_address + 16); 10776 10777 plt0_entry = elf32_arm_plt0_entry; 10778 put_arm_insn (htab, output_bfd, plt0_entry[0], 10779 splt->contents + 0); 10780 put_arm_insn (htab, output_bfd, plt0_entry[1], 10781 splt->contents + 4); 10782 put_arm_insn (htab, output_bfd, plt0_entry[2], 10783 splt->contents + 8); 10784 put_arm_insn (htab, output_bfd, plt0_entry[3], 10785 splt->contents + 12); 10786 10787 #ifdef FOUR_WORD_PLT 10788 /* The displacement value goes in the otherwise-unused 10789 last word of the second entry. */ 10790 bfd_put_32 (output_bfd, got_displacement, splt->contents + 28); 10791 #else 10792 bfd_put_32 (output_bfd, got_displacement, splt->contents + 16); 10793 #endif 10794 } 10795 } 10796 10797 /* UnixWare sets the entsize of .plt to 4, although that doesn't 10798 really seem like the right value. */ 10799 if (splt->output_section->owner == output_bfd) 10800 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; 10801 10802 if (htab->vxworks_p && !info->shared && htab->splt->size > 0) 10803 { 10804 /* Correct the .rel(a).plt.unloaded relocations. They will have 10805 incorrect symbol indexes. */ 10806 int num_plts; 10807 unsigned char *p; 10808 10809 num_plts = ((htab->splt->size - htab->plt_header_size) 10810 / htab->plt_entry_size); 10811 p = htab->srelplt2->contents + RELOC_SIZE (htab); 10812 10813 for (; num_plts; num_plts--) 10814 { 10815 Elf_Internal_Rela rel; 10816 10817 SWAP_RELOC_IN (htab) (output_bfd, p, &rel); 10818 rel.r_info = ELF32_R_INFO (htab->root.hgot->indx, R_ARM_ABS32); 10819 SWAP_RELOC_OUT (htab) (output_bfd, &rel, p); 10820 p += RELOC_SIZE (htab); 10821 10822 SWAP_RELOC_IN (htab) (output_bfd, p, &rel); 10823 rel.r_info = ELF32_R_INFO (htab->root.hplt->indx, R_ARM_ABS32); 10824 SWAP_RELOC_OUT (htab) (output_bfd, &rel, p); 10825 p += RELOC_SIZE (htab); 10826 } 10827 } 10828 } 10829 10830 /* Fill in the first three entries in the global offset table. */ 10831 if (sgot) 10832 { 10833 if (sgot->size > 0) 10834 { 10835 if (sdyn == NULL) 10836 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 10837 else 10838 bfd_put_32 (output_bfd, 10839 sdyn->output_section->vma + sdyn->output_offset, 10840 sgot->contents); 10841 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 10842 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 10843 } 10844 10845 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 10846 } 10847 10848 return TRUE; 10849 } 10850 10851 static void 10852 elf32_arm_post_process_headers (bfd * abfd, struct bfd_link_info * link_info ATTRIBUTE_UNUSED) 10853 { 10854 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ 10855 struct elf32_arm_link_hash_table *globals; 10856 10857 i_ehdrp = elf_elfheader (abfd); 10858 10859 if (EF_ARM_EABI_VERSION (i_ehdrp->e_flags) == EF_ARM_EABI_UNKNOWN) 10860 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_ARM; 10861 else 10862 i_ehdrp->e_ident[EI_OSABI] = 0; 10863 i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; 10864 10865 if (link_info) 10866 { 10867 globals = elf32_arm_hash_table (link_info); 10868 if (globals->byteswap_code) 10869 i_ehdrp->e_flags |= EF_ARM_BE8; 10870 } 10871 } 10872 10873 static enum elf_reloc_type_class 10874 elf32_arm_reloc_type_class (const Elf_Internal_Rela *rela) 10875 { 10876 switch ((int) ELF32_R_TYPE (rela->r_info)) 10877 { 10878 case R_ARM_RELATIVE: 10879 return reloc_class_relative; 10880 case R_ARM_JUMP_SLOT: 10881 return reloc_class_plt; 10882 case R_ARM_COPY: 10883 return reloc_class_copy; 10884 default: 10885 return reloc_class_normal; 10886 } 10887 } 10888 10889 /* Set the right machine number for an Arm ELF file. */ 10890 10891 static bfd_boolean 10892 elf32_arm_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr) 10893 { 10894 if (hdr->sh_type == SHT_NOTE) 10895 *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS; 10896 10897 return TRUE; 10898 } 10899 10900 static void 10901 elf32_arm_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED) 10902 { 10903 bfd_arm_update_notes (abfd, ARM_NOTE_SECTION); 10904 } 10905 10906 /* Return TRUE if this is an unwinding table entry. */ 10907 10908 static bfd_boolean 10909 is_arm_elf_unwind_section_name (bfd * abfd ATTRIBUTE_UNUSED, const char * name) 10910 { 10911 return (CONST_STRNEQ (name, ELF_STRING_ARM_unwind) 10912 || CONST_STRNEQ (name, ELF_STRING_ARM_unwind_once)); 10913 } 10914 10915 10916 /* Set the type and flags for an ARM section. We do this by 10917 the section name, which is a hack, but ought to work. */ 10918 10919 static bfd_boolean 10920 elf32_arm_fake_sections (bfd * abfd, Elf_Internal_Shdr * hdr, asection * sec) 10921 { 10922 const char * name; 10923 10924 name = bfd_get_section_name (abfd, sec); 10925 10926 if (is_arm_elf_unwind_section_name (abfd, name)) 10927 { 10928 hdr->sh_type = SHT_ARM_EXIDX; 10929 hdr->sh_flags |= SHF_LINK_ORDER; 10930 } 10931 return TRUE; 10932 } 10933 10934 /* Handle an ARM specific section when reading an object file. This is 10935 called when bfd_section_from_shdr finds a section with an unknown 10936 type. */ 10937 10938 static bfd_boolean 10939 elf32_arm_section_from_shdr (bfd *abfd, 10940 Elf_Internal_Shdr * hdr, 10941 const char *name, 10942 int shindex) 10943 { 10944 /* There ought to be a place to keep ELF backend specific flags, but 10945 at the moment there isn't one. We just keep track of the 10946 sections by their name, instead. Fortunately, the ABI gives 10947 names for all the ARM specific sections, so we will probably get 10948 away with this. */ 10949 switch (hdr->sh_type) 10950 { 10951 case SHT_ARM_EXIDX: 10952 case SHT_ARM_PREEMPTMAP: 10953 case SHT_ARM_ATTRIBUTES: 10954 break; 10955 10956 default: 10957 return FALSE; 10958 } 10959 10960 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) 10961 return FALSE; 10962 10963 return TRUE; 10964 } 10965 10966 /* A structure used to record a list of sections, independently 10967 of the next and prev fields in the asection structure. */ 10968 typedef struct section_list 10969 { 10970 asection * sec; 10971 struct section_list * next; 10972 struct section_list * prev; 10973 } 10974 section_list; 10975 10976 /* Unfortunately we need to keep a list of sections for which 10977 an _arm_elf_section_data structure has been allocated. This 10978 is because it is possible for functions like elf32_arm_write_section 10979 to be called on a section which has had an elf_data_structure 10980 allocated for it (and so the used_by_bfd field is valid) but 10981 for which the ARM extended version of this structure - the 10982 _arm_elf_section_data structure - has not been allocated. */ 10983 static section_list * sections_with_arm_elf_section_data = NULL; 10984 10985 static void 10986 record_section_with_arm_elf_section_data (asection * sec) 10987 { 10988 struct section_list * entry; 10989 10990 entry = bfd_malloc (sizeof (* entry)); 10991 if (entry == NULL) 10992 return; 10993 entry->sec = sec; 10994 entry->next = sections_with_arm_elf_section_data; 10995 entry->prev = NULL; 10996 if (entry->next != NULL) 10997 entry->next->prev = entry; 10998 sections_with_arm_elf_section_data = entry; 10999 } 11000 11001 static struct section_list * 11002 find_arm_elf_section_entry (asection * sec) 11003 { 11004 struct section_list * entry; 11005 static struct section_list * last_entry = NULL; 11006 11007 /* This is a short cut for the typical case where the sections are added 11008 to the sections_with_arm_elf_section_data list in forward order and 11009 then looked up here in backwards order. This makes a real difference 11010 to the ld-srec/sec64k.exp linker test. */ 11011 entry = sections_with_arm_elf_section_data; 11012 if (last_entry != NULL) 11013 { 11014 if (last_entry->sec == sec) 11015 entry = last_entry; 11016 else if (last_entry->next != NULL 11017 && last_entry->next->sec == sec) 11018 entry = last_entry->next; 11019 } 11020 11021 for (; entry; entry = entry->next) 11022 if (entry->sec == sec) 11023 break; 11024 11025 if (entry) 11026 /* Record the entry prior to this one - it is the entry we are most 11027 likely to want to locate next time. Also this way if we have been 11028 called from unrecord_section_with_arm_elf_section_data() we will not 11029 be caching a pointer that is about to be freed. */ 11030 last_entry = entry->prev; 11031 11032 return entry; 11033 } 11034 11035 static _arm_elf_section_data * 11036 get_arm_elf_section_data (asection * sec) 11037 { 11038 struct section_list * entry; 11039 11040 entry = find_arm_elf_section_entry (sec); 11041 11042 if (entry) 11043 return elf32_arm_section_data (entry->sec); 11044 else 11045 return NULL; 11046 } 11047 11048 static void 11049 unrecord_section_with_arm_elf_section_data (asection * sec) 11050 { 11051 struct section_list * entry; 11052 11053 entry = find_arm_elf_section_entry (sec); 11054 11055 if (entry) 11056 { 11057 if (entry->prev != NULL) 11058 entry->prev->next = entry->next; 11059 if (entry->next != NULL) 11060 entry->next->prev = entry->prev; 11061 if (entry == sections_with_arm_elf_section_data) 11062 sections_with_arm_elf_section_data = entry->next; 11063 free (entry); 11064 } 11065 } 11066 11067 11068 typedef struct 11069 { 11070 void *finfo; 11071 struct bfd_link_info *info; 11072 asection *sec; 11073 int sec_shndx; 11074 bfd_boolean (*func) (void *, const char *, Elf_Internal_Sym *, 11075 asection *, struct elf_link_hash_entry *); 11076 } output_arch_syminfo; 11077 11078 enum map_symbol_type 11079 { 11080 ARM_MAP_ARM, 11081 ARM_MAP_THUMB, 11082 ARM_MAP_DATA 11083 }; 11084 11085 11086 /* Output a single mapping symbol. */ 11087 11088 static bfd_boolean 11089 elf32_arm_output_map_sym (output_arch_syminfo *osi, 11090 enum map_symbol_type type, 11091 bfd_vma offset) 11092 { 11093 static const char *names[3] = {"$a", "$t", "$d"}; 11094 struct elf32_arm_link_hash_table *htab; 11095 Elf_Internal_Sym sym; 11096 11097 htab = elf32_arm_hash_table (osi->info); 11098 sym.st_value = osi->sec->output_section->vma 11099 + osi->sec->output_offset 11100 + offset; 11101 sym.st_size = 0; 11102 sym.st_other = 0; 11103 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_NOTYPE); 11104 sym.st_shndx = osi->sec_shndx; 11105 if (!osi->func (osi->finfo, names[type], &sym, osi->sec, NULL)) 11106 return FALSE; 11107 return TRUE; 11108 } 11109 11110 11111 /* Output mapping symbols for PLT entries associated with H. */ 11112 11113 static bfd_boolean 11114 elf32_arm_output_plt_map (struct elf_link_hash_entry *h, void *inf) 11115 { 11116 output_arch_syminfo *osi = (output_arch_syminfo *) inf; 11117 struct elf32_arm_link_hash_table *htab; 11118 struct elf32_arm_link_hash_entry *eh; 11119 bfd_vma addr; 11120 11121 htab = elf32_arm_hash_table (osi->info); 11122 11123 if (h->root.type == bfd_link_hash_indirect) 11124 return TRUE; 11125 11126 if (h->root.type == bfd_link_hash_warning) 11127 /* When warning symbols are created, they **replace** the "real" 11128 entry in the hash table, thus we never get to see the real 11129 symbol in a hash traversal. So look at it now. */ 11130 h = (struct elf_link_hash_entry *) h->root.u.i.link; 11131 11132 if (h->plt.offset == (bfd_vma) -1) 11133 return TRUE; 11134 11135 eh = (struct elf32_arm_link_hash_entry *) h; 11136 addr = h->plt.offset; 11137 if (htab->symbian_p) 11138 { 11139 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) 11140 return FALSE; 11141 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 4)) 11142 return FALSE; 11143 } 11144 else if (htab->vxworks_p) 11145 { 11146 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) 11147 return FALSE; 11148 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 8)) 11149 return FALSE; 11150 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr + 12)) 11151 return FALSE; 11152 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 20)) 11153 return FALSE; 11154 } 11155 else 11156 { 11157 bfd_signed_vma thumb_refs; 11158 11159 thumb_refs = eh->plt_thumb_refcount; 11160 if (!htab->use_blx) 11161 thumb_refs += eh->plt_maybe_thumb_refcount; 11162 11163 if (thumb_refs > 0) 11164 { 11165 if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr - 4)) 11166 return FALSE; 11167 } 11168 #ifdef FOUR_WORD_PLT 11169 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) 11170 return FALSE; 11171 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 12)) 11172 return FALSE; 11173 #else 11174 /* A three-word PLT with no Thumb thunk contains only Arm code, 11175 so only need to output a mapping symbol for the first PLT entry and 11176 entries with thumb thunks. */ 11177 if (thumb_refs > 0 || addr == 20) 11178 { 11179 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) 11180 return FALSE; 11181 } 11182 #endif 11183 } 11184 11185 return TRUE; 11186 } 11187 11188 /* Output a single local symbol for a generated stub. */ 11189 11190 static bfd_boolean 11191 elf32_arm_output_stub_sym (output_arch_syminfo *osi, const char *name, 11192 bfd_vma offset, bfd_vma size) 11193 { 11194 struct elf32_arm_link_hash_table *htab; 11195 Elf_Internal_Sym sym; 11196 11197 htab = elf32_arm_hash_table (osi->info); 11198 sym.st_value = osi->sec->output_section->vma 11199 + osi->sec->output_offset 11200 + offset; 11201 sym.st_size = size; 11202 sym.st_other = 0; 11203 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FUNC); 11204 sym.st_shndx = osi->sec_shndx; 11205 if (!osi->func (osi->finfo, name, &sym, osi->sec, NULL)) 11206 return FALSE; 11207 return TRUE; 11208 } 11209 11210 static bfd_boolean 11211 arm_map_one_stub (struct bfd_hash_entry * gen_entry, 11212 void * in_arg) 11213 { 11214 struct elf32_arm_stub_hash_entry *stub_entry; 11215 struct bfd_link_info *info; 11216 struct elf32_arm_link_hash_table *htab; 11217 asection *stub_sec; 11218 bfd_vma addr; 11219 char *stub_name; 11220 output_arch_syminfo *osi; 11221 11222 /* Massage our args to the form they really have. */ 11223 stub_entry = (struct elf32_arm_stub_hash_entry *) gen_entry; 11224 osi = (output_arch_syminfo *) in_arg; 11225 11226 info = osi->info; 11227 11228 htab = elf32_arm_hash_table (info); 11229 stub_sec = stub_entry->stub_sec; 11230 11231 /* Ensure this stub is attached to the current section being 11232 processed. */ 11233 if (stub_sec != osi->sec) 11234 return TRUE; 11235 11236 addr = (bfd_vma) stub_entry->stub_offset; 11237 stub_name = stub_entry->output_name; 11238 11239 switch (stub_entry->stub_type) 11240 { 11241 case arm_stub_long_branch: 11242 if (!elf32_arm_output_stub_sym (osi, stub_name, addr, 8)) 11243 return FALSE; 11244 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) 11245 return FALSE; 11246 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 4)) 11247 return FALSE; 11248 break; 11249 case arm_thumb_v4t_stub_long_branch: 11250 if (!elf32_arm_output_stub_sym (osi, stub_name, addr, 12)) 11251 return FALSE; 11252 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) 11253 return FALSE; 11254 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 8)) 11255 return FALSE; 11256 break; 11257 case arm_thumb_thumb_stub_long_branch: 11258 if (!elf32_arm_output_stub_sym (osi, stub_name, addr | 1, 16)) 11259 return FALSE; 11260 if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr)) 11261 return FALSE; 11262 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 12)) 11263 return FALSE; 11264 break; 11265 case arm_thumb_arm_v4t_stub_long_branch: 11266 if (!elf32_arm_output_stub_sym (osi, stub_name, addr | 1, 20)) 11267 return FALSE; 11268 if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr)) 11269 return FALSE; 11270 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr + 8)) 11271 return FALSE; 11272 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 16)) 11273 return FALSE; 11274 break; 11275 case arm_thumb_arm_v4t_stub_short_branch: 11276 if (!elf32_arm_output_stub_sym (osi, stub_name, addr | 1, 8)) 11277 return FALSE; 11278 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr + 4)) 11279 return FALSE; 11280 break; 11281 case arm_stub_pic_long_branch: 11282 if (!elf32_arm_output_stub_sym (osi, stub_name, addr, 12)) 11283 return FALSE; 11284 if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) 11285 return FALSE; 11286 if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 8)) 11287 return FALSE; 11288 break; 11289 default: 11290 BFD_FAIL (); 11291 } 11292 11293 return TRUE; 11294 } 11295 11296 /* Output mapping symbols for linker generated sections. */ 11297 11298 static bfd_boolean 11299 elf32_arm_output_arch_local_syms (bfd *output_bfd, 11300 struct bfd_link_info *info, 11301 void *finfo, 11302 bfd_boolean (*func) (void *, const char *, 11303 Elf_Internal_Sym *, 11304 asection *, 11305 struct elf_link_hash_entry *)) 11306 { 11307 output_arch_syminfo osi; 11308 struct elf32_arm_link_hash_table *htab; 11309 bfd_vma offset; 11310 bfd_size_type size; 11311 11312 htab = elf32_arm_hash_table (info); 11313 check_use_blx (htab); 11314 11315 osi.finfo = finfo; 11316 osi.info = info; 11317 osi.func = func; 11318 11319 /* ARM->Thumb glue. */ 11320 if (htab->arm_glue_size > 0) 11321 { 11322 osi.sec = bfd_get_section_by_name (htab->bfd_of_glue_owner, 11323 ARM2THUMB_GLUE_SECTION_NAME); 11324 11325 osi.sec_shndx = _bfd_elf_section_from_bfd_section 11326 (output_bfd, osi.sec->output_section); 11327 if (info->shared || htab->root.is_relocatable_executable 11328 || htab->pic_veneer) 11329 size = ARM2THUMB_PIC_GLUE_SIZE; 11330 else if (htab->use_blx) 11331 size = ARM2THUMB_V5_STATIC_GLUE_SIZE; 11332 else 11333 size = ARM2THUMB_STATIC_GLUE_SIZE; 11334 11335 for (offset = 0; offset < htab->arm_glue_size; offset += size) 11336 { 11337 elf32_arm_output_map_sym (&osi, ARM_MAP_ARM, offset); 11338 elf32_arm_output_map_sym (&osi, ARM_MAP_DATA, offset + size - 4); 11339 } 11340 } 11341 11342 /* Thumb->ARM glue. */ 11343 if (htab->thumb_glue_size > 0) 11344 { 11345 osi.sec = bfd_get_section_by_name (htab->bfd_of_glue_owner, 11346 THUMB2ARM_GLUE_SECTION_NAME); 11347 11348 osi.sec_shndx = _bfd_elf_section_from_bfd_section 11349 (output_bfd, osi.sec->output_section); 11350 size = THUMB2ARM_GLUE_SIZE; 11351 11352 for (offset = 0; offset < htab->thumb_glue_size; offset += size) 11353 { 11354 elf32_arm_output_map_sym (&osi, ARM_MAP_THUMB, offset); 11355 elf32_arm_output_map_sym (&osi, ARM_MAP_ARM, offset + 4); 11356 } 11357 } 11358 11359 /* ARMv4 BX veneers. */ 11360 if (htab->bx_glue_size > 0) 11361 { 11362 osi.sec = bfd_get_section_by_name (htab->bfd_of_glue_owner, 11363 ARM_BX_GLUE_SECTION_NAME); 11364 11365 osi.sec_shndx = _bfd_elf_section_from_bfd_section 11366 (output_bfd, osi.sec->output_section); 11367 11368 elf32_arm_output_map_sym (&osi, ARM_MAP_ARM, 0); 11369 } 11370 11371 /* Long calls stubs. */ 11372 if (htab->stub_bfd && htab->stub_bfd->sections) 11373 { 11374 asection* stub_sec; 11375 11376 for (stub_sec = htab->stub_bfd->sections; 11377 stub_sec != NULL; 11378 stub_sec = stub_sec->next) 11379 { 11380 /* Ignore non-stub sections. */ 11381 if (!strstr (stub_sec->name, STUB_SUFFIX)) 11382 continue; 11383 11384 osi.sec = stub_sec; 11385 11386 osi.sec_shndx = _bfd_elf_section_from_bfd_section 11387 (output_bfd, osi.sec->output_section); 11388 11389 bfd_hash_traverse (&htab->stub_hash_table, arm_map_one_stub, &osi); 11390 } 11391 } 11392 11393 /* Finally, output mapping symbols for the PLT. */ 11394 if (!htab->splt || htab->splt->size == 0) 11395 return TRUE; 11396 11397 osi.sec_shndx = _bfd_elf_section_from_bfd_section (output_bfd, 11398 htab->splt->output_section); 11399 osi.sec = htab->splt; 11400 /* Output mapping symbols for the plt header. SymbianOS does not have a 11401 plt header. */ 11402 if (htab->vxworks_p) 11403 { 11404 /* VxWorks shared libraries have no PLT header. */ 11405 if (!info->shared) 11406 { 11407 if (!elf32_arm_output_map_sym (&osi, ARM_MAP_ARM, 0)) 11408 return FALSE; 11409 if (!elf32_arm_output_map_sym (&osi, ARM_MAP_DATA, 12)) 11410 return FALSE; 11411 } 11412 } 11413 else if (!htab->symbian_p) 11414 { 11415 if (!elf32_arm_output_map_sym (&osi, ARM_MAP_ARM, 0)) 11416 return FALSE; 11417 #ifndef FOUR_WORD_PLT 11418 if (!elf32_arm_output_map_sym (&osi, ARM_MAP_DATA, 16)) 11419 return FALSE; 11420 #endif 11421 } 11422 11423 elf_link_hash_traverse (&htab->root, elf32_arm_output_plt_map, (void *) &osi); 11424 return TRUE; 11425 } 11426 11427 /* Allocate target specific section data. */ 11428 11429 static bfd_boolean 11430 elf32_arm_new_section_hook (bfd *abfd, asection *sec) 11431 { 11432 if (!sec->used_by_bfd) 11433 { 11434 _arm_elf_section_data *sdata; 11435 bfd_size_type amt = sizeof (*sdata); 11436 11437 sdata = bfd_zalloc (abfd, amt); 11438 if (sdata == NULL) 11439 return FALSE; 11440 sec->used_by_bfd = sdata; 11441 } 11442 11443 record_section_with_arm_elf_section_data (sec); 11444 11445 return _bfd_elf_new_section_hook (abfd, sec); 11446 } 11447 11448 11449 /* Used to order a list of mapping symbols by address. */ 11450 11451 static int 11452 elf32_arm_compare_mapping (const void * a, const void * b) 11453 { 11454 const elf32_arm_section_map *amap = (const elf32_arm_section_map *) a; 11455 const elf32_arm_section_map *bmap = (const elf32_arm_section_map *) b; 11456 11457 if (amap->vma > bmap->vma) 11458 return 1; 11459 else if (amap->vma < bmap->vma) 11460 return -1; 11461 else if (amap->type > bmap->type) 11462 /* Ensure results do not depend on the host qsort for objects with 11463 multiple mapping symbols at the same address by sorting on type 11464 after vma. */ 11465 return 1; 11466 else if (amap->type < bmap->type) 11467 return -1; 11468 else 11469 return 0; 11470 } 11471 11472 11473 /* Do code byteswapping. Return FALSE afterwards so that the section is 11474 written out as normal. */ 11475 11476 static bfd_boolean 11477 elf32_arm_write_section (bfd *output_bfd, 11478 struct bfd_link_info *link_info, 11479 asection *sec, 11480 bfd_byte *contents) 11481 { 11482 int mapcount, errcount; 11483 _arm_elf_section_data *arm_data; 11484 struct elf32_arm_link_hash_table *globals = elf32_arm_hash_table (link_info); 11485 elf32_arm_section_map *map; 11486 elf32_vfp11_erratum_list *errnode; 11487 bfd_vma ptr; 11488 bfd_vma end; 11489 bfd_vma offset = sec->output_section->vma + sec->output_offset; 11490 bfd_byte tmp; 11491 int i; 11492 11493 /* If this section has not been allocated an _arm_elf_section_data 11494 structure then we cannot record anything. */ 11495 arm_data = get_arm_elf_section_data (sec); 11496 if (arm_data == NULL) 11497 return FALSE; 11498 11499 mapcount = arm_data->mapcount; 11500 map = arm_data->map; 11501 errcount = arm_data->erratumcount; 11502 11503 if (errcount != 0) 11504 { 11505 unsigned int endianflip = bfd_big_endian (output_bfd) ? 3 : 0; 11506 11507 for (errnode = arm_data->erratumlist; errnode != 0; 11508 errnode = errnode->next) 11509 { 11510 bfd_vma index = errnode->vma - offset; 11511 11512 switch (errnode->type) 11513 { 11514 case VFP11_ERRATUM_BRANCH_TO_ARM_VENEER: 11515 { 11516 bfd_vma branch_to_veneer; 11517 /* Original condition code of instruction, plus bit mask for 11518 ARM B instruction. */ 11519 unsigned int insn = (errnode->u.b.vfp_insn & 0xf0000000) 11520 | 0x0a000000; 11521 11522 /* The instruction is before the label. */ 11523 index -= 4; 11524 11525 /* Above offset included in -4 below. */ 11526 branch_to_veneer = errnode->u.b.veneer->vma 11527 - errnode->vma - 4; 11528 11529 if ((signed) branch_to_veneer < -(1 << 25) 11530 || (signed) branch_to_veneer >= (1 << 25)) 11531 (*_bfd_error_handler) (_("%B: error: VFP11 veneer out of " 11532 "range"), output_bfd); 11533 11534 insn |= (branch_to_veneer >> 2) & 0xffffff; 11535 contents[endianflip ^ index] = insn & 0xff; 11536 contents[endianflip ^ (index + 1)] = (insn >> 8) & 0xff; 11537 contents[endianflip ^ (index + 2)] = (insn >> 16) & 0xff; 11538 contents[endianflip ^ (index + 3)] = (insn >> 24) & 0xff; 11539 } 11540 break; 11541 11542 case VFP11_ERRATUM_ARM_VENEER: 11543 { 11544 bfd_vma branch_from_veneer; 11545 unsigned int insn; 11546 11547 /* Take size of veneer into account. */ 11548 branch_from_veneer = errnode->u.v.branch->vma 11549 - errnode->vma - 12; 11550 11551 if ((signed) branch_from_veneer < -(1 << 25) 11552 || (signed) branch_from_veneer >= (1 << 25)) 11553 (*_bfd_error_handler) (_("%B: error: VFP11 veneer out of " 11554 "range"), output_bfd); 11555 11556 /* Original instruction. */ 11557 insn = errnode->u.v.branch->u.b.vfp_insn; 11558 contents[endianflip ^ index] = insn & 0xff; 11559 contents[endianflip ^ (index + 1)] = (insn >> 8) & 0xff; 11560 contents[endianflip ^ (index + 2)] = (insn >> 16) & 0xff; 11561 contents[endianflip ^ (index + 3)] = (insn >> 24) & 0xff; 11562 11563 /* Branch back to insn after original insn. */ 11564 insn = 0xea000000 | ((branch_from_veneer >> 2) & 0xffffff); 11565 contents[endianflip ^ (index + 4)] = insn & 0xff; 11566 contents[endianflip ^ (index + 5)] = (insn >> 8) & 0xff; 11567 contents[endianflip ^ (index + 6)] = (insn >> 16) & 0xff; 11568 contents[endianflip ^ (index + 7)] = (insn >> 24) & 0xff; 11569 } 11570 break; 11571 11572 default: 11573 abort (); 11574 } 11575 } 11576 } 11577 11578 if (mapcount == 0) 11579 return FALSE; 11580 11581 if (globals->byteswap_code) 11582 { 11583 qsort (map, mapcount, sizeof (* map), elf32_arm_compare_mapping); 11584 11585 ptr = map[0].vma; 11586 for (i = 0; i < mapcount; i++) 11587 { 11588 if (i == mapcount - 1) 11589 end = sec->size; 11590 else 11591 end = map[i + 1].vma; 11592 11593 switch (map[i].type) 11594 { 11595 case 'a': 11596 /* Byte swap code words. */ 11597 while (ptr + 3 < end) 11598 { 11599 tmp = contents[ptr]; 11600 contents[ptr] = contents[ptr + 3]; 11601 contents[ptr + 3] = tmp; 11602 tmp = contents[ptr + 1]; 11603 contents[ptr + 1] = contents[ptr + 2]; 11604 contents[ptr + 2] = tmp; 11605 ptr += 4; 11606 } 11607 break; 11608 11609 case 't': 11610 /* Byte swap code halfwords. */ 11611 while (ptr + 1 < end) 11612 { 11613 tmp = contents[ptr]; 11614 contents[ptr] = contents[ptr + 1]; 11615 contents[ptr + 1] = tmp; 11616 ptr += 2; 11617 } 11618 break; 11619 11620 case 'd': 11621 /* Leave data alone. */ 11622 break; 11623 } 11624 ptr = end; 11625 } 11626 } 11627 11628 free (map); 11629 arm_data->mapcount = 0; 11630 arm_data->mapsize = 0; 11631 arm_data->map = NULL; 11632 unrecord_section_with_arm_elf_section_data (sec); 11633 11634 return FALSE; 11635 } 11636 11637 static void 11638 unrecord_section_via_map_over_sections (bfd * abfd ATTRIBUTE_UNUSED, 11639 asection * sec, 11640 void * ignore ATTRIBUTE_UNUSED) 11641 { 11642 unrecord_section_with_arm_elf_section_data (sec); 11643 } 11644 11645 static bfd_boolean 11646 elf32_arm_close_and_cleanup (bfd * abfd) 11647 { 11648 if (abfd->sections) 11649 bfd_map_over_sections (abfd, 11650 unrecord_section_via_map_over_sections, 11651 NULL); 11652 11653 return _bfd_elf_close_and_cleanup (abfd); 11654 } 11655 11656 static bfd_boolean 11657 elf32_arm_bfd_free_cached_info (bfd * abfd) 11658 { 11659 if (abfd->sections) 11660 bfd_map_over_sections (abfd, 11661 unrecord_section_via_map_over_sections, 11662 NULL); 11663 11664 return _bfd_free_cached_info (abfd); 11665 } 11666 11667 /* Display STT_ARM_TFUNC symbols as functions. */ 11668 11669 static void 11670 elf32_arm_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, 11671 asymbol *asym) 11672 { 11673 elf_symbol_type *elfsym = (elf_symbol_type *) asym; 11674 11675 if (ELF_ST_TYPE (elfsym->internal_elf_sym.st_info) == STT_ARM_TFUNC) 11676 elfsym->symbol.flags |= BSF_FUNCTION; 11677 } 11678 11679 11680 /* Mangle thumb function symbols as we read them in. */ 11681 11682 static bfd_boolean 11683 elf32_arm_swap_symbol_in (bfd * abfd, 11684 const void *psrc, 11685 const void *pshn, 11686 Elf_Internal_Sym *dst) 11687 { 11688 if (!bfd_elf32_swap_symbol_in (abfd, psrc, pshn, dst)) 11689 return FALSE; 11690 11691 /* New EABI objects mark thumb function symbols by setting the low bit of 11692 the address. Turn these into STT_ARM_TFUNC. */ 11693 if (ELF_ST_TYPE (dst->st_info) == STT_FUNC 11694 && (dst->st_value & 1)) 11695 { 11696 dst->st_info = ELF_ST_INFO (ELF_ST_BIND (dst->st_info), STT_ARM_TFUNC); 11697 dst->st_value &= ~(bfd_vma) 1; 11698 } 11699 return TRUE; 11700 } 11701 11702 11703 /* Mangle thumb function symbols as we write them out. */ 11704 11705 static void 11706 elf32_arm_swap_symbol_out (bfd *abfd, 11707 const Elf_Internal_Sym *src, 11708 void *cdst, 11709 void *shndx) 11710 { 11711 Elf_Internal_Sym newsym; 11712 11713 /* We convert STT_ARM_TFUNC symbols into STT_FUNC with the low bit 11714 of the address set, as per the new EABI. We do this unconditionally 11715 because objcopy does not set the elf header flags until after 11716 it writes out the symbol table. */ 11717 if (ELF_ST_TYPE (src->st_info) == STT_ARM_TFUNC) 11718 { 11719 newsym = *src; 11720 newsym.st_info = ELF_ST_INFO (ELF_ST_BIND (src->st_info), STT_FUNC); 11721 if (newsym.st_shndx != SHN_UNDEF) 11722 { 11723 /* Do this only for defined symbols. At link type, the static 11724 linker will simulate the work of dynamic linker of resolving 11725 symbols and will carry over the thumbness of found symbols to 11726 the output symbol table. It's not clear how it happens, but 11727 the thumbness of undefined symbols can well be different at 11728 runtime, and writing '1' for them will be confusing for users 11729 and possibly for dynamic linker itself. 11730 */ 11731 newsym.st_value |= 1; 11732 } 11733 11734 src = &newsym; 11735 } 11736 bfd_elf32_swap_symbol_out (abfd, src, cdst, shndx); 11737 } 11738 11739 /* Add the PT_ARM_EXIDX program header. */ 11740 11741 static bfd_boolean 11742 elf32_arm_modify_segment_map (bfd *abfd, 11743 struct bfd_link_info *info ATTRIBUTE_UNUSED) 11744 { 11745 struct elf_segment_map *m; 11746 asection *sec; 11747 11748 sec = bfd_get_section_by_name (abfd, ".ARM.exidx"); 11749 if (sec != NULL && (sec->flags & SEC_LOAD) != 0) 11750 { 11751 /* If there is already a PT_ARM_EXIDX header, then we do not 11752 want to add another one. This situation arises when running 11753 "strip"; the input binary already has the header. */ 11754 m = elf_tdata (abfd)->segment_map; 11755 while (m && m->p_type != PT_ARM_EXIDX) 11756 m = m->next; 11757 if (!m) 11758 { 11759 m = bfd_zalloc (abfd, sizeof (struct elf_segment_map)); 11760 if (m == NULL) 11761 return FALSE; 11762 m->p_type = PT_ARM_EXIDX; 11763 m->count = 1; 11764 m->sections[0] = sec; 11765 11766 m->next = elf_tdata (abfd)->segment_map; 11767 elf_tdata (abfd)->segment_map = m; 11768 } 11769 } 11770 11771 return TRUE; 11772 } 11773 11774 /* We may add a PT_ARM_EXIDX program header. */ 11775 11776 static int 11777 elf32_arm_additional_program_headers (bfd *abfd, 11778 struct bfd_link_info *info ATTRIBUTE_UNUSED) 11779 { 11780 asection *sec; 11781 11782 sec = bfd_get_section_by_name (abfd, ".ARM.exidx"); 11783 if (sec != NULL && (sec->flags & SEC_LOAD) != 0) 11784 return 1; 11785 else 11786 return 0; 11787 } 11788 11789 /* We have two function types: STT_FUNC and STT_ARM_TFUNC. */ 11790 11791 static bfd_boolean 11792 elf32_arm_is_function_type (unsigned int type) 11793 { 11794 return (type == STT_FUNC) || (type == STT_ARM_TFUNC); 11795 } 11796 11797 /* We use this to override swap_symbol_in and swap_symbol_out. */ 11798 const struct elf_size_info elf32_arm_size_info = 11799 { 11800 sizeof (Elf32_External_Ehdr), 11801 sizeof (Elf32_External_Phdr), 11802 sizeof (Elf32_External_Shdr), 11803 sizeof (Elf32_External_Rel), 11804 sizeof (Elf32_External_Rela), 11805 sizeof (Elf32_External_Sym), 11806 sizeof (Elf32_External_Dyn), 11807 sizeof (Elf_External_Note), 11808 4, 11809 1, 11810 32, 2, 11811 ELFCLASS32, EV_CURRENT, 11812 bfd_elf32_write_out_phdrs, 11813 bfd_elf32_write_shdrs_and_ehdr, 11814 bfd_elf32_checksum_contents, 11815 bfd_elf32_write_relocs, 11816 elf32_arm_swap_symbol_in, 11817 elf32_arm_swap_symbol_out, 11818 bfd_elf32_slurp_reloc_table, 11819 bfd_elf32_slurp_symbol_table, 11820 bfd_elf32_swap_dyn_in, 11821 bfd_elf32_swap_dyn_out, 11822 bfd_elf32_swap_reloc_in, 11823 bfd_elf32_swap_reloc_out, 11824 bfd_elf32_swap_reloca_in, 11825 bfd_elf32_swap_reloca_out 11826 }; 11827 11828 #define ELF_ARCH bfd_arch_arm 11829 #define ELF_MACHINE_CODE EM_ARM 11830 #ifdef __QNXTARGET__ 11831 #define ELF_MAXPAGESIZE 0x1000 11832 #else 11833 #define ELF_MAXPAGESIZE 0x8000 11834 #endif 11835 #define ELF_MINPAGESIZE 0x1000 11836 #define ELF_COMMONPAGESIZE 0x1000 11837 11838 #define bfd_elf32_mkobject elf32_arm_mkobject 11839 11840 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data 11841 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data 11842 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags 11843 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data 11844 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create 11845 #define bfd_elf32_bfd_link_hash_table_free elf32_arm_hash_table_free 11846 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup 11847 #define bfd_elf32_bfd_reloc_name_lookup elf32_arm_reloc_name_lookup 11848 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line 11849 #define bfd_elf32_find_inliner_info elf32_arm_find_inliner_info 11850 #define bfd_elf32_new_section_hook elf32_arm_new_section_hook 11851 #define bfd_elf32_bfd_is_target_special_symbol elf32_arm_is_target_special_symbol 11852 #define bfd_elf32_close_and_cleanup elf32_arm_close_and_cleanup 11853 #define bfd_elf32_bfd_free_cached_info elf32_arm_bfd_free_cached_info 11854 11855 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type 11856 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook 11857 #define elf_backend_gc_mark_extra_sections elf32_arm_gc_mark_extra_sections 11858 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook 11859 #define elf_backend_check_relocs elf32_arm_check_relocs 11860 #define elf_backend_relocate_section elf32_arm_relocate_section 11861 #define elf_backend_write_section elf32_arm_write_section 11862 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol 11863 #define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections 11864 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol 11865 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections 11866 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections 11867 #define elf_backend_init_index_section _bfd_elf_init_2_index_sections 11868 #define elf_backend_post_process_headers elf32_arm_post_process_headers 11869 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class 11870 #define elf_backend_object_p elf32_arm_object_p 11871 #define elf_backend_section_flags elf32_arm_section_flags 11872 #define elf_backend_fake_sections elf32_arm_fake_sections 11873 #define elf_backend_section_from_shdr elf32_arm_section_from_shdr 11874 #define elf_backend_final_write_processing elf32_arm_final_write_processing 11875 #define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol 11876 #define elf_backend_symbol_processing elf32_arm_symbol_processing 11877 #define elf_backend_size_info elf32_arm_size_info 11878 #define elf_backend_modify_segment_map elf32_arm_modify_segment_map 11879 #define elf_backend_additional_program_headers elf32_arm_additional_program_headers 11880 #define elf_backend_output_arch_local_syms elf32_arm_output_arch_local_syms 11881 #define elf_backend_begin_write_processing elf32_arm_begin_write_processing 11882 #define elf_backend_is_function_type elf32_arm_is_function_type 11883 11884 #define elf_backend_can_refcount 1 11885 #define elf_backend_can_gc_sections 1 11886 #define elf_backend_plt_readonly 1 11887 #define elf_backend_want_got_plt 1 11888 #define elf_backend_want_plt_sym 0 11889 #define elf_backend_may_use_rel_p 1 11890 #define elf_backend_may_use_rela_p 0 11891 #define elf_backend_default_use_rela_p 0 11892 11893 #define elf_backend_got_header_size 12 11894 11895 #undef elf_backend_obj_attrs_vendor 11896 #define elf_backend_obj_attrs_vendor "aeabi" 11897 #undef elf_backend_obj_attrs_section 11898 #define elf_backend_obj_attrs_section ".ARM.attributes" 11899 #undef elf_backend_obj_attrs_arg_type 11900 #define elf_backend_obj_attrs_arg_type elf32_arm_obj_attrs_arg_type 11901 #undef elf_backend_obj_attrs_section_type 11902 #define elf_backend_obj_attrs_section_type SHT_ARM_ATTRIBUTES 11903 11904 #include "elf32-target.h" 11905 11906 /* VxWorks Targets. */ 11907 11908 #undef TARGET_LITTLE_SYM 11909 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_vxworks_vec 11910 #undef TARGET_LITTLE_NAME 11911 #define TARGET_LITTLE_NAME "elf32-littlearm-vxworks" 11912 #undef TARGET_BIG_SYM 11913 #define TARGET_BIG_SYM bfd_elf32_bigarm_vxworks_vec 11914 #undef TARGET_BIG_NAME 11915 #define TARGET_BIG_NAME "elf32-bigarm-vxworks" 11916 11917 /* Like elf32_arm_link_hash_table_create -- but overrides 11918 appropriately for VxWorks. */ 11919 11920 static struct bfd_link_hash_table * 11921 elf32_arm_vxworks_link_hash_table_create (bfd *abfd) 11922 { 11923 struct bfd_link_hash_table *ret; 11924 11925 ret = elf32_arm_link_hash_table_create (abfd); 11926 if (ret) 11927 { 11928 struct elf32_arm_link_hash_table *htab 11929 = (struct elf32_arm_link_hash_table *) ret; 11930 htab->use_rel = 0; 11931 htab->vxworks_p = 1; 11932 } 11933 return ret; 11934 } 11935 11936 static void 11937 elf32_arm_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker) 11938 { 11939 elf32_arm_final_write_processing (abfd, linker); 11940 elf_vxworks_final_write_processing (abfd, linker); 11941 } 11942 11943 #undef elf32_bed 11944 #define elf32_bed elf32_arm_vxworks_bed 11945 11946 #undef bfd_elf32_bfd_link_hash_table_create 11947 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_vxworks_link_hash_table_create 11948 #undef elf_backend_add_symbol_hook 11949 #define elf_backend_add_symbol_hook elf_vxworks_add_symbol_hook 11950 #undef elf_backend_final_write_processing 11951 #define elf_backend_final_write_processing elf32_arm_vxworks_final_write_processing 11952 #undef elf_backend_emit_relocs 11953 #define elf_backend_emit_relocs elf_vxworks_emit_relocs 11954 11955 #undef elf_backend_may_use_rel_p 11956 #define elf_backend_may_use_rel_p 0 11957 #undef elf_backend_may_use_rela_p 11958 #define elf_backend_may_use_rela_p 1 11959 #undef elf_backend_default_use_rela_p 11960 #define elf_backend_default_use_rela_p 1 11961 #undef elf_backend_want_plt_sym 11962 #define elf_backend_want_plt_sym 1 11963 #undef ELF_MAXPAGESIZE 11964 #define ELF_MAXPAGESIZE 0x1000 11965 11966 #include "elf32-target.h" 11967 11968 11969 /* Symbian OS Targets. */ 11970 11971 #undef TARGET_LITTLE_SYM 11972 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_symbian_vec 11973 #undef TARGET_LITTLE_NAME 11974 #define TARGET_LITTLE_NAME "elf32-littlearm-symbian" 11975 #undef TARGET_BIG_SYM 11976 #define TARGET_BIG_SYM bfd_elf32_bigarm_symbian_vec 11977 #undef TARGET_BIG_NAME 11978 #define TARGET_BIG_NAME "elf32-bigarm-symbian" 11979 11980 /* Like elf32_arm_link_hash_table_create -- but overrides 11981 appropriately for Symbian OS. */ 11982 11983 static struct bfd_link_hash_table * 11984 elf32_arm_symbian_link_hash_table_create (bfd *abfd) 11985 { 11986 struct bfd_link_hash_table *ret; 11987 11988 ret = elf32_arm_link_hash_table_create (abfd); 11989 if (ret) 11990 { 11991 struct elf32_arm_link_hash_table *htab 11992 = (struct elf32_arm_link_hash_table *)ret; 11993 /* There is no PLT header for Symbian OS. */ 11994 htab->plt_header_size = 0; 11995 /* The PLT entries are each one instruction and one word. */ 11996 htab->plt_entry_size = 4 * ARRAY_SIZE (elf32_arm_symbian_plt_entry); 11997 htab->symbian_p = 1; 11998 /* Symbian uses armv5t or above, so use_blx is always true. */ 11999 htab->use_blx = 1; 12000 htab->root.is_relocatable_executable = 1; 12001 } 12002 return ret; 12003 } 12004 12005 static const struct bfd_elf_special_section 12006 elf32_arm_symbian_special_sections[] = 12007 { 12008 /* In a BPABI executable, the dynamic linking sections do not go in 12009 the loadable read-only segment. The post-linker may wish to 12010 refer to these sections, but they are not part of the final 12011 program image. */ 12012 { STRING_COMMA_LEN (".dynamic"), 0, SHT_DYNAMIC, 0 }, 12013 { STRING_COMMA_LEN (".dynstr"), 0, SHT_STRTAB, 0 }, 12014 { STRING_COMMA_LEN (".dynsym"), 0, SHT_DYNSYM, 0 }, 12015 { STRING_COMMA_LEN (".got"), 0, SHT_PROGBITS, 0 }, 12016 { STRING_COMMA_LEN (".hash"), 0, SHT_HASH, 0 }, 12017 /* These sections do not need to be writable as the SymbianOS 12018 postlinker will arrange things so that no dynamic relocation is 12019 required. */ 12020 { STRING_COMMA_LEN (".init_array"), 0, SHT_INIT_ARRAY, SHF_ALLOC }, 12021 { STRING_COMMA_LEN (".fini_array"), 0, SHT_FINI_ARRAY, SHF_ALLOC }, 12022 { STRING_COMMA_LEN (".preinit_array"), 0, SHT_PREINIT_ARRAY, SHF_ALLOC }, 12023 { NULL, 0, 0, 0, 0 } 12024 }; 12025 12026 static void 12027 elf32_arm_symbian_begin_write_processing (bfd *abfd, 12028 struct bfd_link_info *link_info) 12029 { 12030 /* BPABI objects are never loaded directly by an OS kernel; they are 12031 processed by a postlinker first, into an OS-specific format. If 12032 the D_PAGED bit is set on the file, BFD will align segments on 12033 page boundaries, so that an OS can directly map the file. With 12034 BPABI objects, that just results in wasted space. In addition, 12035 because we clear the D_PAGED bit, map_sections_to_segments will 12036 recognize that the program headers should not be mapped into any 12037 loadable segment. */ 12038 abfd->flags &= ~D_PAGED; 12039 elf32_arm_begin_write_processing (abfd, link_info); 12040 } 12041 12042 static bfd_boolean 12043 elf32_arm_symbian_modify_segment_map (bfd *abfd, 12044 struct bfd_link_info *info) 12045 { 12046 struct elf_segment_map *m; 12047 asection *dynsec; 12048 12049 /* BPABI shared libraries and executables should have a PT_DYNAMIC 12050 segment. However, because the .dynamic section is not marked 12051 with SEC_LOAD, the generic ELF code will not create such a 12052 segment. */ 12053 dynsec = bfd_get_section_by_name (abfd, ".dynamic"); 12054 if (dynsec) 12055 { 12056 for (m = elf_tdata (abfd)->segment_map; m != NULL; m = m->next) 12057 if (m->p_type == PT_DYNAMIC) 12058 break; 12059 12060 if (m == NULL) 12061 { 12062 m = _bfd_elf_make_dynamic_segment (abfd, dynsec); 12063 m->next = elf_tdata (abfd)->segment_map; 12064 elf_tdata (abfd)->segment_map = m; 12065 } 12066 } 12067 12068 /* Also call the generic arm routine. */ 12069 return elf32_arm_modify_segment_map (abfd, info); 12070 } 12071 12072 /* Return address for Ith PLT stub in section PLT, for relocation REL 12073 or (bfd_vma) -1 if it should not be included. */ 12074 12075 static bfd_vma 12076 elf32_arm_symbian_plt_sym_val (bfd_vma i, const asection *plt, 12077 const arelent *rel ATTRIBUTE_UNUSED) 12078 { 12079 return plt->vma + 4 * ARRAY_SIZE (elf32_arm_symbian_plt_entry) * i; 12080 } 12081 12082 12083 #undef elf32_bed 12084 #define elf32_bed elf32_arm_symbian_bed 12085 12086 /* The dynamic sections are not allocated on SymbianOS; the postlinker 12087 will process them and then discard them. */ 12088 #undef ELF_DYNAMIC_SEC_FLAGS 12089 #define ELF_DYNAMIC_SEC_FLAGS \ 12090 (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED) 12091 12092 #undef elf_backend_add_symbol_hook 12093 #undef elf_backend_emit_relocs 12094 12095 #undef bfd_elf32_bfd_link_hash_table_create 12096 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_symbian_link_hash_table_create 12097 #undef elf_backend_special_sections 12098 #define elf_backend_special_sections elf32_arm_symbian_special_sections 12099 #undef elf_backend_begin_write_processing 12100 #define elf_backend_begin_write_processing elf32_arm_symbian_begin_write_processing 12101 #undef elf_backend_final_write_processing 12102 #define elf_backend_final_write_processing elf32_arm_final_write_processing 12103 12104 #undef elf_backend_modify_segment_map 12105 #define elf_backend_modify_segment_map elf32_arm_symbian_modify_segment_map 12106 12107 /* There is no .got section for BPABI objects, and hence no header. */ 12108 #undef elf_backend_got_header_size 12109 #define elf_backend_got_header_size 0 12110 12111 /* Similarly, there is no .got.plt section. */ 12112 #undef elf_backend_want_got_plt 12113 #define elf_backend_want_got_plt 0 12114 12115 #undef elf_backend_plt_sym_val 12116 #define elf_backend_plt_sym_val elf32_arm_symbian_plt_sym_val 12117 12118 #undef elf_backend_may_use_rel_p 12119 #define elf_backend_may_use_rel_p 1 12120 #undef elf_backend_may_use_rela_p 12121 #define elf_backend_may_use_rela_p 0 12122 #undef elf_backend_default_use_rela_p 12123 #define elf_backend_default_use_rela_p 0 12124 #undef elf_backend_want_plt_sym 12125 #define elf_backend_want_plt_sym 0 12126 #undef ELF_MAXPAGESIZE 12127 #define ELF_MAXPAGESIZE 0x8000 12128 12129 #include "elf32-target.h" 12130