1 /* PowerPC-specific support for 32-bit ELF 2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. 4 Written by Ian Lance Taylor, Cygnus Support. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the 20 Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 21 Boston, MA 02110-1301, USA. */ 22 23 24 /* This file is based on a preliminary PowerPC ELF ABI. The 25 information may not match the final PowerPC ELF ABI. It includes 26 suggestions from the in-progress Embedded PowerPC ABI, and that 27 information may also not match. */ 28 29 #include "sysdep.h" 30 #include <stdarg.h> 31 #include "bfd.h" 32 #include "bfdlink.h" 33 #include "libbfd.h" 34 #include "elf-bfd.h" 35 #include "elf/ppc.h" 36 #include "elf32-ppc.h" 37 #include "elf-vxworks.h" 38 39 /* RELA relocations are used here. */ 40 41 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc 42 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 43 static bfd_reloc_status_type ppc_elf_unhandled_reloc 44 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 45 46 /* Branch prediction bit for branch taken relocs. */ 47 #define BRANCH_PREDICT_BIT 0x200000 48 /* Mask to set RA in memory instructions. */ 49 #define RA_REGISTER_MASK 0x001f0000 50 /* Value to shift register by to insert RA. */ 51 #define RA_REGISTER_SHIFT 16 52 53 /* The name of the dynamic interpreter. This is put in the .interp 54 section. */ 55 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 56 57 /* For old-style PLT. */ 58 /* The number of single-slot PLT entries (the rest use two slots). */ 59 #define PLT_NUM_SINGLE_ENTRIES 8192 60 61 /* For new-style .glink and .plt. */ 62 #define GLINK_PLTRESOLVE 16*4 63 #define GLINK_ENTRY_SIZE 4*4 64 65 /* VxWorks uses its own plt layout, filled in by the static linker. */ 66 67 /* The standard VxWorks PLT entry. */ 68 #define VXWORKS_PLT_ENTRY_SIZE 32 69 static const bfd_vma ppc_elf_vxworks_plt_entry 70 [VXWORKS_PLT_ENTRY_SIZE / 4] = 71 { 72 0x3d800000, /* lis r12,0 */ 73 0x818c0000, /* lwz r12,0(r12) */ 74 0x7d8903a6, /* mtctr r12 */ 75 0x4e800420, /* bctr */ 76 0x39600000, /* li r11,0 */ 77 0x48000000, /* b 14 <.PLT0resolve+0x4> */ 78 0x60000000, /* nop */ 79 0x60000000, /* nop */ 80 }; 81 static const bfd_vma ppc_elf_vxworks_pic_plt_entry 82 [VXWORKS_PLT_ENTRY_SIZE / 4] = 83 { 84 0x3d9e0000, /* addis r12,r30,0 */ 85 0x818c0000, /* lwz r12,0(r12) */ 86 0x7d8903a6, /* mtctr r12 */ 87 0x4e800420, /* bctr */ 88 0x39600000, /* li r11,0 */ 89 0x48000000, /* b 14 <.PLT0resolve+0x4> 14: R_PPC_REL24 .PLTresolve */ 90 0x60000000, /* nop */ 91 0x60000000, /* nop */ 92 }; 93 94 /* The initial VxWorks PLT entry. */ 95 #define VXWORKS_PLT_INITIAL_ENTRY_SIZE 32 96 static const bfd_vma ppc_elf_vxworks_plt0_entry 97 [VXWORKS_PLT_INITIAL_ENTRY_SIZE / 4] = 98 { 99 0x3d800000, /* lis r12,0 */ 100 0x398c0000, /* addi r12,r12,0 */ 101 0x800c0008, /* lwz r0,8(r12) */ 102 0x7c0903a6, /* mtctr r0 */ 103 0x818c0004, /* lwz r12,4(r12) */ 104 0x4e800420, /* bctr */ 105 0x60000000, /* nop */ 106 0x60000000, /* nop */ 107 }; 108 static const bfd_vma ppc_elf_vxworks_pic_plt0_entry 109 [VXWORKS_PLT_INITIAL_ENTRY_SIZE / 4] = 110 { 111 0x819e0008, /* lwz r12,8(r30) */ 112 0x7d8903a6, /* mtctr r12 */ 113 0x819e0004, /* lwz r12,4(r30) */ 114 0x4e800420, /* bctr */ 115 0x60000000, /* nop */ 116 0x60000000, /* nop */ 117 0x60000000, /* nop */ 118 0x60000000, /* nop */ 119 }; 120 121 /* For executables, we have some additional relocations in 122 .rela.plt.unloaded, for the kernel loader. */ 123 124 /* The number of non-JMP_SLOT relocations per PLT0 slot. */ 125 #define VXWORKS_PLT_NON_JMP_SLOT_RELOCS 3 126 /* The number of relocations in the PLTResolve slot. */ 127 #define VXWORKS_PLTRESOLVE_RELOCS 2 128 /* The number of relocations in the PLTResolve slot when when creating 129 a shared library. */ 130 #define VXWORKS_PLTRESOLVE_RELOCS_SHLIB 0 131 132 /* Some instructions. */ 133 #define ADDIS_11_11 0x3d6b0000 134 #define ADDIS_11_30 0x3d7e0000 135 #define ADDIS_12_12 0x3d8c0000 136 #define ADDI_11_11 0x396b0000 137 #define ADD_0_11_11 0x7c0b5a14 138 #define ADD_11_0_11 0x7d605a14 139 #define B 0x48000000 140 #define BCL_20_31 0x429f0005 141 #define BCTR 0x4e800420 142 #define LIS_11 0x3d600000 143 #define LIS_12 0x3d800000 144 #define LWZU_0_12 0x840c0000 145 #define LWZ_0_12 0x800c0000 146 #define LWZ_11_11 0x816b0000 147 #define LWZ_11_30 0x817e0000 148 #define LWZ_12_12 0x818c0000 149 #define MFLR_0 0x7c0802a6 150 #define MFLR_12 0x7d8802a6 151 #define MTCTR_0 0x7c0903a6 152 #define MTCTR_11 0x7d6903a6 153 #define MTLR_0 0x7c0803a6 154 #define NOP 0x60000000 155 #define SUB_11_11_12 0x7d6c5850 156 157 /* Offset of tp and dtp pointers from start of TLS block. */ 158 #define TP_OFFSET 0x7000 159 #define DTP_OFFSET 0x8000 160 161 /* The value of a defined global symbol. */ 162 #define SYM_VAL(SYM) \ 163 ((SYM)->root.u.def.section->output_section->vma \ 164 + (SYM)->root.u.def.section->output_offset \ 165 + (SYM)->root.u.def.value) 166 167 static reloc_howto_type *ppc_elf_howto_table[R_PPC_max]; 168 169 static reloc_howto_type ppc_elf_howto_raw[] = { 170 /* This reloc does nothing. */ 171 HOWTO (R_PPC_NONE, /* type */ 172 0, /* rightshift */ 173 2, /* size (0 = byte, 1 = short, 2 = long) */ 174 32, /* bitsize */ 175 FALSE, /* pc_relative */ 176 0, /* bitpos */ 177 complain_overflow_bitfield, /* complain_on_overflow */ 178 bfd_elf_generic_reloc, /* special_function */ 179 "R_PPC_NONE", /* name */ 180 FALSE, /* partial_inplace */ 181 0, /* src_mask */ 182 0, /* dst_mask */ 183 FALSE), /* pcrel_offset */ 184 185 /* A standard 32 bit relocation. */ 186 HOWTO (R_PPC_ADDR32, /* type */ 187 0, /* rightshift */ 188 2, /* size (0 = byte, 1 = short, 2 = long) */ 189 32, /* bitsize */ 190 FALSE, /* pc_relative */ 191 0, /* bitpos */ 192 complain_overflow_bitfield, /* complain_on_overflow */ 193 bfd_elf_generic_reloc, /* special_function */ 194 "R_PPC_ADDR32", /* name */ 195 FALSE, /* partial_inplace */ 196 0, /* src_mask */ 197 0xffffffff, /* dst_mask */ 198 FALSE), /* pcrel_offset */ 199 200 /* An absolute 26 bit branch; the lower two bits must be zero. 201 FIXME: we don't check that, we just clear them. */ 202 HOWTO (R_PPC_ADDR24, /* type */ 203 0, /* rightshift */ 204 2, /* size (0 = byte, 1 = short, 2 = long) */ 205 26, /* bitsize */ 206 FALSE, /* pc_relative */ 207 0, /* bitpos */ 208 complain_overflow_bitfield, /* complain_on_overflow */ 209 bfd_elf_generic_reloc, /* special_function */ 210 "R_PPC_ADDR24", /* name */ 211 FALSE, /* partial_inplace */ 212 0, /* src_mask */ 213 0x3fffffc, /* dst_mask */ 214 FALSE), /* pcrel_offset */ 215 216 /* A standard 16 bit relocation. */ 217 HOWTO (R_PPC_ADDR16, /* type */ 218 0, /* rightshift */ 219 1, /* size (0 = byte, 1 = short, 2 = long) */ 220 16, /* bitsize */ 221 FALSE, /* pc_relative */ 222 0, /* bitpos */ 223 complain_overflow_bitfield, /* complain_on_overflow */ 224 bfd_elf_generic_reloc, /* special_function */ 225 "R_PPC_ADDR16", /* name */ 226 FALSE, /* partial_inplace */ 227 0, /* src_mask */ 228 0xffff, /* dst_mask */ 229 FALSE), /* pcrel_offset */ 230 231 /* A 16 bit relocation without overflow. */ 232 HOWTO (R_PPC_ADDR16_LO, /* type */ 233 0, /* rightshift */ 234 1, /* size (0 = byte, 1 = short, 2 = long) */ 235 16, /* bitsize */ 236 FALSE, /* pc_relative */ 237 0, /* bitpos */ 238 complain_overflow_dont,/* complain_on_overflow */ 239 bfd_elf_generic_reloc, /* special_function */ 240 "R_PPC_ADDR16_LO", /* name */ 241 FALSE, /* partial_inplace */ 242 0, /* src_mask */ 243 0xffff, /* dst_mask */ 244 FALSE), /* pcrel_offset */ 245 246 /* The high order 16 bits of an address. */ 247 HOWTO (R_PPC_ADDR16_HI, /* type */ 248 16, /* rightshift */ 249 1, /* size (0 = byte, 1 = short, 2 = long) */ 250 16, /* bitsize */ 251 FALSE, /* pc_relative */ 252 0, /* bitpos */ 253 complain_overflow_dont, /* complain_on_overflow */ 254 bfd_elf_generic_reloc, /* special_function */ 255 "R_PPC_ADDR16_HI", /* name */ 256 FALSE, /* partial_inplace */ 257 0, /* src_mask */ 258 0xffff, /* dst_mask */ 259 FALSE), /* pcrel_offset */ 260 261 /* The high order 16 bits of an address, plus 1 if the contents of 262 the low 16 bits, treated as a signed number, is negative. */ 263 HOWTO (R_PPC_ADDR16_HA, /* type */ 264 16, /* rightshift */ 265 1, /* size (0 = byte, 1 = short, 2 = long) */ 266 16, /* bitsize */ 267 FALSE, /* pc_relative */ 268 0, /* bitpos */ 269 complain_overflow_dont, /* complain_on_overflow */ 270 ppc_elf_addr16_ha_reloc, /* special_function */ 271 "R_PPC_ADDR16_HA", /* name */ 272 FALSE, /* partial_inplace */ 273 0, /* src_mask */ 274 0xffff, /* dst_mask */ 275 FALSE), /* pcrel_offset */ 276 277 /* An absolute 16 bit branch; the lower two bits must be zero. 278 FIXME: we don't check that, we just clear them. */ 279 HOWTO (R_PPC_ADDR14, /* type */ 280 0, /* rightshift */ 281 2, /* size (0 = byte, 1 = short, 2 = long) */ 282 16, /* bitsize */ 283 FALSE, /* pc_relative */ 284 0, /* bitpos */ 285 complain_overflow_bitfield, /* complain_on_overflow */ 286 bfd_elf_generic_reloc, /* special_function */ 287 "R_PPC_ADDR14", /* name */ 288 FALSE, /* partial_inplace */ 289 0, /* src_mask */ 290 0xfffc, /* dst_mask */ 291 FALSE), /* pcrel_offset */ 292 293 /* An absolute 16 bit branch, for which bit 10 should be set to 294 indicate that the branch is expected to be taken. The lower two 295 bits must be zero. */ 296 HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */ 297 0, /* rightshift */ 298 2, /* size (0 = byte, 1 = short, 2 = long) */ 299 16, /* bitsize */ 300 FALSE, /* pc_relative */ 301 0, /* bitpos */ 302 complain_overflow_bitfield, /* complain_on_overflow */ 303 bfd_elf_generic_reloc, /* special_function */ 304 "R_PPC_ADDR14_BRTAKEN",/* name */ 305 FALSE, /* partial_inplace */ 306 0, /* src_mask */ 307 0xfffc, /* dst_mask */ 308 FALSE), /* pcrel_offset */ 309 310 /* An absolute 16 bit branch, for which bit 10 should be set to 311 indicate that the branch is not expected to be taken. The lower 312 two bits must be zero. */ 313 HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */ 314 0, /* rightshift */ 315 2, /* size (0 = byte, 1 = short, 2 = long) */ 316 16, /* bitsize */ 317 FALSE, /* pc_relative */ 318 0, /* bitpos */ 319 complain_overflow_bitfield, /* complain_on_overflow */ 320 bfd_elf_generic_reloc, /* special_function */ 321 "R_PPC_ADDR14_BRNTAKEN",/* name */ 322 FALSE, /* partial_inplace */ 323 0, /* src_mask */ 324 0xfffc, /* dst_mask */ 325 FALSE), /* pcrel_offset */ 326 327 /* A relative 26 bit branch; the lower two bits must be zero. */ 328 HOWTO (R_PPC_REL24, /* type */ 329 0, /* rightshift */ 330 2, /* size (0 = byte, 1 = short, 2 = long) */ 331 26, /* bitsize */ 332 TRUE, /* pc_relative */ 333 0, /* bitpos */ 334 complain_overflow_signed, /* complain_on_overflow */ 335 bfd_elf_generic_reloc, /* special_function */ 336 "R_PPC_REL24", /* name */ 337 FALSE, /* partial_inplace */ 338 0, /* src_mask */ 339 0x3fffffc, /* dst_mask */ 340 TRUE), /* pcrel_offset */ 341 342 /* A relative 16 bit branch; the lower two bits must be zero. */ 343 HOWTO (R_PPC_REL14, /* type */ 344 0, /* rightshift */ 345 2, /* size (0 = byte, 1 = short, 2 = long) */ 346 16, /* bitsize */ 347 TRUE, /* pc_relative */ 348 0, /* bitpos */ 349 complain_overflow_signed, /* complain_on_overflow */ 350 bfd_elf_generic_reloc, /* special_function */ 351 "R_PPC_REL14", /* name */ 352 FALSE, /* partial_inplace */ 353 0, /* src_mask */ 354 0xfffc, /* dst_mask */ 355 TRUE), /* pcrel_offset */ 356 357 /* A relative 16 bit branch. Bit 10 should be set to indicate that 358 the branch is expected to be taken. The lower two bits must be 359 zero. */ 360 HOWTO (R_PPC_REL14_BRTAKEN, /* type */ 361 0, /* rightshift */ 362 2, /* size (0 = byte, 1 = short, 2 = long) */ 363 16, /* bitsize */ 364 TRUE, /* pc_relative */ 365 0, /* bitpos */ 366 complain_overflow_signed, /* complain_on_overflow */ 367 bfd_elf_generic_reloc, /* special_function */ 368 "R_PPC_REL14_BRTAKEN", /* name */ 369 FALSE, /* partial_inplace */ 370 0, /* src_mask */ 371 0xfffc, /* dst_mask */ 372 TRUE), /* pcrel_offset */ 373 374 /* A relative 16 bit branch. Bit 10 should be set to indicate that 375 the branch is not expected to be taken. The lower two bits must 376 be zero. */ 377 HOWTO (R_PPC_REL14_BRNTAKEN, /* type */ 378 0, /* rightshift */ 379 2, /* size (0 = byte, 1 = short, 2 = long) */ 380 16, /* bitsize */ 381 TRUE, /* pc_relative */ 382 0, /* bitpos */ 383 complain_overflow_signed, /* complain_on_overflow */ 384 bfd_elf_generic_reloc, /* special_function */ 385 "R_PPC_REL14_BRNTAKEN",/* name */ 386 FALSE, /* partial_inplace */ 387 0, /* src_mask */ 388 0xfffc, /* dst_mask */ 389 TRUE), /* pcrel_offset */ 390 391 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the 392 symbol. */ 393 HOWTO (R_PPC_GOT16, /* type */ 394 0, /* rightshift */ 395 1, /* size (0 = byte, 1 = short, 2 = long) */ 396 16, /* bitsize */ 397 FALSE, /* pc_relative */ 398 0, /* bitpos */ 399 complain_overflow_signed, /* complain_on_overflow */ 400 bfd_elf_generic_reloc, /* special_function */ 401 "R_PPC_GOT16", /* name */ 402 FALSE, /* partial_inplace */ 403 0, /* src_mask */ 404 0xffff, /* dst_mask */ 405 FALSE), /* pcrel_offset */ 406 407 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for 408 the symbol. */ 409 HOWTO (R_PPC_GOT16_LO, /* type */ 410 0, /* rightshift */ 411 1, /* size (0 = byte, 1 = short, 2 = long) */ 412 16, /* bitsize */ 413 FALSE, /* pc_relative */ 414 0, /* bitpos */ 415 complain_overflow_dont, /* complain_on_overflow */ 416 bfd_elf_generic_reloc, /* special_function */ 417 "R_PPC_GOT16_LO", /* name */ 418 FALSE, /* partial_inplace */ 419 0, /* src_mask */ 420 0xffff, /* dst_mask */ 421 FALSE), /* pcrel_offset */ 422 423 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for 424 the symbol. */ 425 HOWTO (R_PPC_GOT16_HI, /* type */ 426 16, /* rightshift */ 427 1, /* size (0 = byte, 1 = short, 2 = long) */ 428 16, /* bitsize */ 429 FALSE, /* pc_relative */ 430 0, /* bitpos */ 431 complain_overflow_bitfield, /* complain_on_overflow */ 432 bfd_elf_generic_reloc, /* special_function */ 433 "R_PPC_GOT16_HI", /* name */ 434 FALSE, /* partial_inplace */ 435 0, /* src_mask */ 436 0xffff, /* dst_mask */ 437 FALSE), /* pcrel_offset */ 438 439 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for 440 the symbol. */ 441 HOWTO (R_PPC_GOT16_HA, /* type */ 442 16, /* rightshift */ 443 1, /* size (0 = byte, 1 = short, 2 = long) */ 444 16, /* bitsize */ 445 FALSE, /* pc_relative */ 446 0, /* bitpos */ 447 complain_overflow_bitfield, /* complain_on_overflow */ 448 ppc_elf_addr16_ha_reloc, /* special_function */ 449 "R_PPC_GOT16_HA", /* name */ 450 FALSE, /* partial_inplace */ 451 0, /* src_mask */ 452 0xffff, /* dst_mask */ 453 FALSE), /* pcrel_offset */ 454 455 /* Like R_PPC_REL24, but referring to the procedure linkage table 456 entry for the symbol. */ 457 HOWTO (R_PPC_PLTREL24, /* type */ 458 0, /* rightshift */ 459 2, /* size (0 = byte, 1 = short, 2 = long) */ 460 26, /* bitsize */ 461 TRUE, /* pc_relative */ 462 0, /* bitpos */ 463 complain_overflow_signed, /* complain_on_overflow */ 464 bfd_elf_generic_reloc, /* special_function */ 465 "R_PPC_PLTREL24", /* name */ 466 FALSE, /* partial_inplace */ 467 0, /* src_mask */ 468 0x3fffffc, /* dst_mask */ 469 TRUE), /* pcrel_offset */ 470 471 /* This is used only by the dynamic linker. The symbol should exist 472 both in the object being run and in some shared library. The 473 dynamic linker copies the data addressed by the symbol from the 474 shared library into the object, because the object being 475 run has to have the data at some particular address. */ 476 HOWTO (R_PPC_COPY, /* type */ 477 0, /* rightshift */ 478 2, /* size (0 = byte, 1 = short, 2 = long) */ 479 32, /* bitsize */ 480 FALSE, /* pc_relative */ 481 0, /* bitpos */ 482 complain_overflow_bitfield, /* complain_on_overflow */ 483 bfd_elf_generic_reloc, /* special_function */ 484 "R_PPC_COPY", /* name */ 485 FALSE, /* partial_inplace */ 486 0, /* src_mask */ 487 0, /* dst_mask */ 488 FALSE), /* pcrel_offset */ 489 490 /* Like R_PPC_ADDR32, but used when setting global offset table 491 entries. */ 492 HOWTO (R_PPC_GLOB_DAT, /* type */ 493 0, /* rightshift */ 494 2, /* size (0 = byte, 1 = short, 2 = long) */ 495 32, /* bitsize */ 496 FALSE, /* pc_relative */ 497 0, /* bitpos */ 498 complain_overflow_bitfield, /* complain_on_overflow */ 499 bfd_elf_generic_reloc, /* special_function */ 500 "R_PPC_GLOB_DAT", /* name */ 501 FALSE, /* partial_inplace */ 502 0, /* src_mask */ 503 0xffffffff, /* dst_mask */ 504 FALSE), /* pcrel_offset */ 505 506 /* Marks a procedure linkage table entry for a symbol. */ 507 HOWTO (R_PPC_JMP_SLOT, /* type */ 508 0, /* rightshift */ 509 2, /* size (0 = byte, 1 = short, 2 = long) */ 510 32, /* bitsize */ 511 FALSE, /* pc_relative */ 512 0, /* bitpos */ 513 complain_overflow_bitfield, /* complain_on_overflow */ 514 bfd_elf_generic_reloc, /* special_function */ 515 "R_PPC_JMP_SLOT", /* name */ 516 FALSE, /* partial_inplace */ 517 0, /* src_mask */ 518 0, /* dst_mask */ 519 FALSE), /* pcrel_offset */ 520 521 /* Used only by the dynamic linker. When the object is run, this 522 longword is set to the load address of the object, plus the 523 addend. */ 524 HOWTO (R_PPC_RELATIVE, /* type */ 525 0, /* rightshift */ 526 2, /* size (0 = byte, 1 = short, 2 = long) */ 527 32, /* bitsize */ 528 FALSE, /* pc_relative */ 529 0, /* bitpos */ 530 complain_overflow_bitfield, /* complain_on_overflow */ 531 bfd_elf_generic_reloc, /* special_function */ 532 "R_PPC_RELATIVE", /* name */ 533 FALSE, /* partial_inplace */ 534 0, /* src_mask */ 535 0xffffffff, /* dst_mask */ 536 FALSE), /* pcrel_offset */ 537 538 /* Like R_PPC_REL24, but uses the value of the symbol within the 539 object rather than the final value. Normally used for 540 _GLOBAL_OFFSET_TABLE_. */ 541 HOWTO (R_PPC_LOCAL24PC, /* type */ 542 0, /* rightshift */ 543 2, /* size (0 = byte, 1 = short, 2 = long) */ 544 26, /* bitsize */ 545 TRUE, /* pc_relative */ 546 0, /* bitpos */ 547 complain_overflow_signed, /* complain_on_overflow */ 548 bfd_elf_generic_reloc, /* special_function */ 549 "R_PPC_LOCAL24PC", /* name */ 550 FALSE, /* partial_inplace */ 551 0, /* src_mask */ 552 0x3fffffc, /* dst_mask */ 553 TRUE), /* pcrel_offset */ 554 555 /* Like R_PPC_ADDR32, but may be unaligned. */ 556 HOWTO (R_PPC_UADDR32, /* type */ 557 0, /* rightshift */ 558 2, /* size (0 = byte, 1 = short, 2 = long) */ 559 32, /* bitsize */ 560 FALSE, /* pc_relative */ 561 0, /* bitpos */ 562 complain_overflow_bitfield, /* complain_on_overflow */ 563 bfd_elf_generic_reloc, /* special_function */ 564 "R_PPC_UADDR32", /* name */ 565 FALSE, /* partial_inplace */ 566 0, /* src_mask */ 567 0xffffffff, /* dst_mask */ 568 FALSE), /* pcrel_offset */ 569 570 /* Like R_PPC_ADDR16, but may be unaligned. */ 571 HOWTO (R_PPC_UADDR16, /* type */ 572 0, /* rightshift */ 573 1, /* size (0 = byte, 1 = short, 2 = long) */ 574 16, /* bitsize */ 575 FALSE, /* pc_relative */ 576 0, /* bitpos */ 577 complain_overflow_bitfield, /* complain_on_overflow */ 578 bfd_elf_generic_reloc, /* special_function */ 579 "R_PPC_UADDR16", /* name */ 580 FALSE, /* partial_inplace */ 581 0, /* src_mask */ 582 0xffff, /* dst_mask */ 583 FALSE), /* pcrel_offset */ 584 585 /* 32-bit PC relative */ 586 HOWTO (R_PPC_REL32, /* type */ 587 0, /* rightshift */ 588 2, /* size (0 = byte, 1 = short, 2 = long) */ 589 32, /* bitsize */ 590 TRUE, /* pc_relative */ 591 0, /* bitpos */ 592 complain_overflow_bitfield, /* complain_on_overflow */ 593 bfd_elf_generic_reloc, /* special_function */ 594 "R_PPC_REL32", /* name */ 595 FALSE, /* partial_inplace */ 596 0, /* src_mask */ 597 0xffffffff, /* dst_mask */ 598 TRUE), /* pcrel_offset */ 599 600 /* 32-bit relocation to the symbol's procedure linkage table. 601 FIXME: not supported. */ 602 HOWTO (R_PPC_PLT32, /* type */ 603 0, /* rightshift */ 604 2, /* size (0 = byte, 1 = short, 2 = long) */ 605 32, /* bitsize */ 606 FALSE, /* pc_relative */ 607 0, /* bitpos */ 608 complain_overflow_bitfield, /* complain_on_overflow */ 609 bfd_elf_generic_reloc, /* special_function */ 610 "R_PPC_PLT32", /* name */ 611 FALSE, /* partial_inplace */ 612 0, /* src_mask */ 613 0, /* dst_mask */ 614 FALSE), /* pcrel_offset */ 615 616 /* 32-bit PC relative relocation to the symbol's procedure linkage table. 617 FIXME: not supported. */ 618 HOWTO (R_PPC_PLTREL32, /* type */ 619 0, /* rightshift */ 620 2, /* size (0 = byte, 1 = short, 2 = long) */ 621 32, /* bitsize */ 622 TRUE, /* pc_relative */ 623 0, /* bitpos */ 624 complain_overflow_bitfield, /* complain_on_overflow */ 625 bfd_elf_generic_reloc, /* special_function */ 626 "R_PPC_PLTREL32", /* name */ 627 FALSE, /* partial_inplace */ 628 0, /* src_mask */ 629 0, /* dst_mask */ 630 TRUE), /* pcrel_offset */ 631 632 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for 633 the symbol. */ 634 HOWTO (R_PPC_PLT16_LO, /* type */ 635 0, /* rightshift */ 636 1, /* size (0 = byte, 1 = short, 2 = long) */ 637 16, /* bitsize */ 638 FALSE, /* pc_relative */ 639 0, /* bitpos */ 640 complain_overflow_dont, /* complain_on_overflow */ 641 bfd_elf_generic_reloc, /* special_function */ 642 "R_PPC_PLT16_LO", /* name */ 643 FALSE, /* partial_inplace */ 644 0, /* src_mask */ 645 0xffff, /* dst_mask */ 646 FALSE), /* pcrel_offset */ 647 648 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for 649 the symbol. */ 650 HOWTO (R_PPC_PLT16_HI, /* type */ 651 16, /* rightshift */ 652 1, /* size (0 = byte, 1 = short, 2 = long) */ 653 16, /* bitsize */ 654 FALSE, /* pc_relative */ 655 0, /* bitpos */ 656 complain_overflow_bitfield, /* complain_on_overflow */ 657 bfd_elf_generic_reloc, /* special_function */ 658 "R_PPC_PLT16_HI", /* name */ 659 FALSE, /* partial_inplace */ 660 0, /* src_mask */ 661 0xffff, /* dst_mask */ 662 FALSE), /* pcrel_offset */ 663 664 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for 665 the symbol. */ 666 HOWTO (R_PPC_PLT16_HA, /* type */ 667 16, /* rightshift */ 668 1, /* size (0 = byte, 1 = short, 2 = long) */ 669 16, /* bitsize */ 670 FALSE, /* pc_relative */ 671 0, /* bitpos */ 672 complain_overflow_bitfield, /* complain_on_overflow */ 673 ppc_elf_addr16_ha_reloc, /* special_function */ 674 "R_PPC_PLT16_HA", /* name */ 675 FALSE, /* partial_inplace */ 676 0, /* src_mask */ 677 0xffff, /* dst_mask */ 678 FALSE), /* pcrel_offset */ 679 680 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with 681 small data items. */ 682 HOWTO (R_PPC_SDAREL16, /* type */ 683 0, /* rightshift */ 684 1, /* size (0 = byte, 1 = short, 2 = long) */ 685 16, /* bitsize */ 686 FALSE, /* pc_relative */ 687 0, /* bitpos */ 688 complain_overflow_signed, /* complain_on_overflow */ 689 bfd_elf_generic_reloc, /* special_function */ 690 "R_PPC_SDAREL16", /* name */ 691 FALSE, /* partial_inplace */ 692 0, /* src_mask */ 693 0xffff, /* dst_mask */ 694 FALSE), /* pcrel_offset */ 695 696 /* 16-bit section relative relocation. */ 697 HOWTO (R_PPC_SECTOFF, /* type */ 698 0, /* rightshift */ 699 1, /* size (0 = byte, 1 = short, 2 = long) */ 700 16, /* bitsize */ 701 FALSE, /* pc_relative */ 702 0, /* bitpos */ 703 complain_overflow_bitfield, /* complain_on_overflow */ 704 bfd_elf_generic_reloc, /* special_function */ 705 "R_PPC_SECTOFF", /* name */ 706 FALSE, /* partial_inplace */ 707 0, /* src_mask */ 708 0xffff, /* dst_mask */ 709 FALSE), /* pcrel_offset */ 710 711 /* 16-bit lower half section relative relocation. */ 712 HOWTO (R_PPC_SECTOFF_LO, /* type */ 713 0, /* rightshift */ 714 1, /* size (0 = byte, 1 = short, 2 = long) */ 715 16, /* bitsize */ 716 FALSE, /* pc_relative */ 717 0, /* bitpos */ 718 complain_overflow_dont, /* complain_on_overflow */ 719 bfd_elf_generic_reloc, /* special_function */ 720 "R_PPC_SECTOFF_LO", /* name */ 721 FALSE, /* partial_inplace */ 722 0, /* src_mask */ 723 0xffff, /* dst_mask */ 724 FALSE), /* pcrel_offset */ 725 726 /* 16-bit upper half section relative relocation. */ 727 HOWTO (R_PPC_SECTOFF_HI, /* type */ 728 16, /* rightshift */ 729 1, /* size (0 = byte, 1 = short, 2 = long) */ 730 16, /* bitsize */ 731 FALSE, /* pc_relative */ 732 0, /* bitpos */ 733 complain_overflow_bitfield, /* complain_on_overflow */ 734 bfd_elf_generic_reloc, /* special_function */ 735 "R_PPC_SECTOFF_HI", /* name */ 736 FALSE, /* partial_inplace */ 737 0, /* src_mask */ 738 0xffff, /* dst_mask */ 739 FALSE), /* pcrel_offset */ 740 741 /* 16-bit upper half adjusted section relative relocation. */ 742 HOWTO (R_PPC_SECTOFF_HA, /* type */ 743 16, /* rightshift */ 744 1, /* size (0 = byte, 1 = short, 2 = long) */ 745 16, /* bitsize */ 746 FALSE, /* pc_relative */ 747 0, /* bitpos */ 748 complain_overflow_bitfield, /* complain_on_overflow */ 749 ppc_elf_addr16_ha_reloc, /* special_function */ 750 "R_PPC_SECTOFF_HA", /* name */ 751 FALSE, /* partial_inplace */ 752 0, /* src_mask */ 753 0xffff, /* dst_mask */ 754 FALSE), /* pcrel_offset */ 755 756 /* Marker reloc for TLS. */ 757 HOWTO (R_PPC_TLS, 758 0, /* rightshift */ 759 2, /* size (0 = byte, 1 = short, 2 = long) */ 760 32, /* bitsize */ 761 FALSE, /* pc_relative */ 762 0, /* bitpos */ 763 complain_overflow_dont, /* complain_on_overflow */ 764 bfd_elf_generic_reloc, /* special_function */ 765 "R_PPC_TLS", /* name */ 766 FALSE, /* partial_inplace */ 767 0, /* src_mask */ 768 0, /* dst_mask */ 769 FALSE), /* pcrel_offset */ 770 771 /* Computes the load module index of the load module that contains the 772 definition of its TLS sym. */ 773 HOWTO (R_PPC_DTPMOD32, 774 0, /* rightshift */ 775 2, /* size (0 = byte, 1 = short, 2 = long) */ 776 32, /* bitsize */ 777 FALSE, /* pc_relative */ 778 0, /* bitpos */ 779 complain_overflow_dont, /* complain_on_overflow */ 780 ppc_elf_unhandled_reloc, /* special_function */ 781 "R_PPC_DTPMOD32", /* name */ 782 FALSE, /* partial_inplace */ 783 0, /* src_mask */ 784 0xffffffff, /* dst_mask */ 785 FALSE), /* pcrel_offset */ 786 787 /* Computes a dtv-relative displacement, the difference between the value 788 of sym+add and the base address of the thread-local storage block that 789 contains the definition of sym, minus 0x8000. */ 790 HOWTO (R_PPC_DTPREL32, 791 0, /* rightshift */ 792 2, /* size (0 = byte, 1 = short, 2 = long) */ 793 32, /* bitsize */ 794 FALSE, /* pc_relative */ 795 0, /* bitpos */ 796 complain_overflow_dont, /* complain_on_overflow */ 797 ppc_elf_unhandled_reloc, /* special_function */ 798 "R_PPC_DTPREL32", /* name */ 799 FALSE, /* partial_inplace */ 800 0, /* src_mask */ 801 0xffffffff, /* dst_mask */ 802 FALSE), /* pcrel_offset */ 803 804 /* A 16 bit dtprel reloc. */ 805 HOWTO (R_PPC_DTPREL16, 806 0, /* rightshift */ 807 1, /* size (0 = byte, 1 = short, 2 = long) */ 808 16, /* bitsize */ 809 FALSE, /* pc_relative */ 810 0, /* bitpos */ 811 complain_overflow_signed, /* complain_on_overflow */ 812 ppc_elf_unhandled_reloc, /* special_function */ 813 "R_PPC_DTPREL16", /* name */ 814 FALSE, /* partial_inplace */ 815 0, /* src_mask */ 816 0xffff, /* dst_mask */ 817 FALSE), /* pcrel_offset */ 818 819 /* Like DTPREL16, but no overflow. */ 820 HOWTO (R_PPC_DTPREL16_LO, 821 0, /* rightshift */ 822 1, /* size (0 = byte, 1 = short, 2 = long) */ 823 16, /* bitsize */ 824 FALSE, /* pc_relative */ 825 0, /* bitpos */ 826 complain_overflow_dont, /* complain_on_overflow */ 827 ppc_elf_unhandled_reloc, /* special_function */ 828 "R_PPC_DTPREL16_LO", /* name */ 829 FALSE, /* partial_inplace */ 830 0, /* src_mask */ 831 0xffff, /* dst_mask */ 832 FALSE), /* pcrel_offset */ 833 834 /* Like DTPREL16_LO, but next higher group of 16 bits. */ 835 HOWTO (R_PPC_DTPREL16_HI, 836 16, /* rightshift */ 837 1, /* size (0 = byte, 1 = short, 2 = long) */ 838 16, /* bitsize */ 839 FALSE, /* pc_relative */ 840 0, /* bitpos */ 841 complain_overflow_dont, /* complain_on_overflow */ 842 ppc_elf_unhandled_reloc, /* special_function */ 843 "R_PPC_DTPREL16_HI", /* name */ 844 FALSE, /* partial_inplace */ 845 0, /* src_mask */ 846 0xffff, /* dst_mask */ 847 FALSE), /* pcrel_offset */ 848 849 /* Like DTPREL16_HI, but adjust for low 16 bits. */ 850 HOWTO (R_PPC_DTPREL16_HA, 851 16, /* rightshift */ 852 1, /* size (0 = byte, 1 = short, 2 = long) */ 853 16, /* bitsize */ 854 FALSE, /* pc_relative */ 855 0, /* bitpos */ 856 complain_overflow_dont, /* complain_on_overflow */ 857 ppc_elf_unhandled_reloc, /* special_function */ 858 "R_PPC_DTPREL16_HA", /* name */ 859 FALSE, /* partial_inplace */ 860 0, /* src_mask */ 861 0xffff, /* dst_mask */ 862 FALSE), /* pcrel_offset */ 863 864 /* Computes a tp-relative displacement, the difference between the value of 865 sym+add and the value of the thread pointer (r13). */ 866 HOWTO (R_PPC_TPREL32, 867 0, /* rightshift */ 868 2, /* size (0 = byte, 1 = short, 2 = long) */ 869 32, /* bitsize */ 870 FALSE, /* pc_relative */ 871 0, /* bitpos */ 872 complain_overflow_dont, /* complain_on_overflow */ 873 ppc_elf_unhandled_reloc, /* special_function */ 874 "R_PPC_TPREL32", /* name */ 875 FALSE, /* partial_inplace */ 876 0, /* src_mask */ 877 0xffffffff, /* dst_mask */ 878 FALSE), /* pcrel_offset */ 879 880 /* A 16 bit tprel reloc. */ 881 HOWTO (R_PPC_TPREL16, 882 0, /* rightshift */ 883 1, /* size (0 = byte, 1 = short, 2 = long) */ 884 16, /* bitsize */ 885 FALSE, /* pc_relative */ 886 0, /* bitpos */ 887 complain_overflow_signed, /* complain_on_overflow */ 888 ppc_elf_unhandled_reloc, /* special_function */ 889 "R_PPC_TPREL16", /* name */ 890 FALSE, /* partial_inplace */ 891 0, /* src_mask */ 892 0xffff, /* dst_mask */ 893 FALSE), /* pcrel_offset */ 894 895 /* Like TPREL16, but no overflow. */ 896 HOWTO (R_PPC_TPREL16_LO, 897 0, /* rightshift */ 898 1, /* size (0 = byte, 1 = short, 2 = long) */ 899 16, /* bitsize */ 900 FALSE, /* pc_relative */ 901 0, /* bitpos */ 902 complain_overflow_dont, /* complain_on_overflow */ 903 ppc_elf_unhandled_reloc, /* special_function */ 904 "R_PPC_TPREL16_LO", /* name */ 905 FALSE, /* partial_inplace */ 906 0, /* src_mask */ 907 0xffff, /* dst_mask */ 908 FALSE), /* pcrel_offset */ 909 910 /* Like TPREL16_LO, but next higher group of 16 bits. */ 911 HOWTO (R_PPC_TPREL16_HI, 912 16, /* rightshift */ 913 1, /* size (0 = byte, 1 = short, 2 = long) */ 914 16, /* bitsize */ 915 FALSE, /* pc_relative */ 916 0, /* bitpos */ 917 complain_overflow_dont, /* complain_on_overflow */ 918 ppc_elf_unhandled_reloc, /* special_function */ 919 "R_PPC_TPREL16_HI", /* name */ 920 FALSE, /* partial_inplace */ 921 0, /* src_mask */ 922 0xffff, /* dst_mask */ 923 FALSE), /* pcrel_offset */ 924 925 /* Like TPREL16_HI, but adjust for low 16 bits. */ 926 HOWTO (R_PPC_TPREL16_HA, 927 16, /* rightshift */ 928 1, /* size (0 = byte, 1 = short, 2 = long) */ 929 16, /* bitsize */ 930 FALSE, /* pc_relative */ 931 0, /* bitpos */ 932 complain_overflow_dont, /* complain_on_overflow */ 933 ppc_elf_unhandled_reloc, /* special_function */ 934 "R_PPC_TPREL16_HA", /* name */ 935 FALSE, /* partial_inplace */ 936 0, /* src_mask */ 937 0xffff, /* dst_mask */ 938 FALSE), /* pcrel_offset */ 939 940 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 941 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset 942 to the first entry. */ 943 HOWTO (R_PPC_GOT_TLSGD16, 944 0, /* rightshift */ 945 1, /* size (0 = byte, 1 = short, 2 = long) */ 946 16, /* bitsize */ 947 FALSE, /* pc_relative */ 948 0, /* bitpos */ 949 complain_overflow_signed, /* complain_on_overflow */ 950 ppc_elf_unhandled_reloc, /* special_function */ 951 "R_PPC_GOT_TLSGD16", /* name */ 952 FALSE, /* partial_inplace */ 953 0, /* src_mask */ 954 0xffff, /* dst_mask */ 955 FALSE), /* pcrel_offset */ 956 957 /* Like GOT_TLSGD16, but no overflow. */ 958 HOWTO (R_PPC_GOT_TLSGD16_LO, 959 0, /* rightshift */ 960 1, /* size (0 = byte, 1 = short, 2 = long) */ 961 16, /* bitsize */ 962 FALSE, /* pc_relative */ 963 0, /* bitpos */ 964 complain_overflow_dont, /* complain_on_overflow */ 965 ppc_elf_unhandled_reloc, /* special_function */ 966 "R_PPC_GOT_TLSGD16_LO", /* name */ 967 FALSE, /* partial_inplace */ 968 0, /* src_mask */ 969 0xffff, /* dst_mask */ 970 FALSE), /* pcrel_offset */ 971 972 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */ 973 HOWTO (R_PPC_GOT_TLSGD16_HI, 974 16, /* rightshift */ 975 1, /* size (0 = byte, 1 = short, 2 = long) */ 976 16, /* bitsize */ 977 FALSE, /* pc_relative */ 978 0, /* bitpos */ 979 complain_overflow_dont, /* complain_on_overflow */ 980 ppc_elf_unhandled_reloc, /* special_function */ 981 "R_PPC_GOT_TLSGD16_HI", /* name */ 982 FALSE, /* partial_inplace */ 983 0, /* src_mask */ 984 0xffff, /* dst_mask */ 985 FALSE), /* pcrel_offset */ 986 987 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */ 988 HOWTO (R_PPC_GOT_TLSGD16_HA, 989 16, /* rightshift */ 990 1, /* size (0 = byte, 1 = short, 2 = long) */ 991 16, /* bitsize */ 992 FALSE, /* pc_relative */ 993 0, /* bitpos */ 994 complain_overflow_dont, /* complain_on_overflow */ 995 ppc_elf_unhandled_reloc, /* special_function */ 996 "R_PPC_GOT_TLSGD16_HA", /* name */ 997 FALSE, /* partial_inplace */ 998 0, /* src_mask */ 999 0xffff, /* dst_mask */ 1000 FALSE), /* pcrel_offset */ 1001 1002 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1003 with values (sym+add)@dtpmod and zero, and computes the offset to the 1004 first entry. */ 1005 HOWTO (R_PPC_GOT_TLSLD16, 1006 0, /* rightshift */ 1007 1, /* size (0 = byte, 1 = short, 2 = long) */ 1008 16, /* bitsize */ 1009 FALSE, /* pc_relative */ 1010 0, /* bitpos */ 1011 complain_overflow_signed, /* complain_on_overflow */ 1012 ppc_elf_unhandled_reloc, /* special_function */ 1013 "R_PPC_GOT_TLSLD16", /* name */ 1014 FALSE, /* partial_inplace */ 1015 0, /* src_mask */ 1016 0xffff, /* dst_mask */ 1017 FALSE), /* pcrel_offset */ 1018 1019 /* Like GOT_TLSLD16, but no overflow. */ 1020 HOWTO (R_PPC_GOT_TLSLD16_LO, 1021 0, /* rightshift */ 1022 1, /* size (0 = byte, 1 = short, 2 = long) */ 1023 16, /* bitsize */ 1024 FALSE, /* pc_relative */ 1025 0, /* bitpos */ 1026 complain_overflow_dont, /* complain_on_overflow */ 1027 ppc_elf_unhandled_reloc, /* special_function */ 1028 "R_PPC_GOT_TLSLD16_LO", /* name */ 1029 FALSE, /* partial_inplace */ 1030 0, /* src_mask */ 1031 0xffff, /* dst_mask */ 1032 FALSE), /* pcrel_offset */ 1033 1034 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */ 1035 HOWTO (R_PPC_GOT_TLSLD16_HI, 1036 16, /* rightshift */ 1037 1, /* size (0 = byte, 1 = short, 2 = long) */ 1038 16, /* bitsize */ 1039 FALSE, /* pc_relative */ 1040 0, /* bitpos */ 1041 complain_overflow_dont, /* complain_on_overflow */ 1042 ppc_elf_unhandled_reloc, /* special_function */ 1043 "R_PPC_GOT_TLSLD16_HI", /* name */ 1044 FALSE, /* partial_inplace */ 1045 0, /* src_mask */ 1046 0xffff, /* dst_mask */ 1047 FALSE), /* pcrel_offset */ 1048 1049 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */ 1050 HOWTO (R_PPC_GOT_TLSLD16_HA, 1051 16, /* rightshift */ 1052 1, /* size (0 = byte, 1 = short, 2 = long) */ 1053 16, /* bitsize */ 1054 FALSE, /* pc_relative */ 1055 0, /* bitpos */ 1056 complain_overflow_dont, /* complain_on_overflow */ 1057 ppc_elf_unhandled_reloc, /* special_function */ 1058 "R_PPC_GOT_TLSLD16_HA", /* name */ 1059 FALSE, /* partial_inplace */ 1060 0, /* src_mask */ 1061 0xffff, /* dst_mask */ 1062 FALSE), /* pcrel_offset */ 1063 1064 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes 1065 the offset to the entry. */ 1066 HOWTO (R_PPC_GOT_DTPREL16, 1067 0, /* rightshift */ 1068 1, /* size (0 = byte, 1 = short, 2 = long) */ 1069 16, /* bitsize */ 1070 FALSE, /* pc_relative */ 1071 0, /* bitpos */ 1072 complain_overflow_signed, /* complain_on_overflow */ 1073 ppc_elf_unhandled_reloc, /* special_function */ 1074 "R_PPC_GOT_DTPREL16", /* name */ 1075 FALSE, /* partial_inplace */ 1076 0, /* src_mask */ 1077 0xffff, /* dst_mask */ 1078 FALSE), /* pcrel_offset */ 1079 1080 /* Like GOT_DTPREL16, but no overflow. */ 1081 HOWTO (R_PPC_GOT_DTPREL16_LO, 1082 0, /* rightshift */ 1083 1, /* size (0 = byte, 1 = short, 2 = long) */ 1084 16, /* bitsize */ 1085 FALSE, /* pc_relative */ 1086 0, /* bitpos */ 1087 complain_overflow_dont, /* complain_on_overflow */ 1088 ppc_elf_unhandled_reloc, /* special_function */ 1089 "R_PPC_GOT_DTPREL16_LO", /* name */ 1090 FALSE, /* partial_inplace */ 1091 0, /* src_mask */ 1092 0xffff, /* dst_mask */ 1093 FALSE), /* pcrel_offset */ 1094 1095 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */ 1096 HOWTO (R_PPC_GOT_DTPREL16_HI, 1097 16, /* rightshift */ 1098 1, /* size (0 = byte, 1 = short, 2 = long) */ 1099 16, /* bitsize */ 1100 FALSE, /* pc_relative */ 1101 0, /* bitpos */ 1102 complain_overflow_dont, /* complain_on_overflow */ 1103 ppc_elf_unhandled_reloc, /* special_function */ 1104 "R_PPC_GOT_DTPREL16_HI", /* name */ 1105 FALSE, /* partial_inplace */ 1106 0, /* src_mask */ 1107 0xffff, /* dst_mask */ 1108 FALSE), /* pcrel_offset */ 1109 1110 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */ 1111 HOWTO (R_PPC_GOT_DTPREL16_HA, 1112 16, /* rightshift */ 1113 1, /* size (0 = byte, 1 = short, 2 = long) */ 1114 16, /* bitsize */ 1115 FALSE, /* pc_relative */ 1116 0, /* bitpos */ 1117 complain_overflow_dont, /* complain_on_overflow */ 1118 ppc_elf_unhandled_reloc, /* special_function */ 1119 "R_PPC_GOT_DTPREL16_HA", /* name */ 1120 FALSE, /* partial_inplace */ 1121 0, /* src_mask */ 1122 0xffff, /* dst_mask */ 1123 FALSE), /* pcrel_offset */ 1124 1125 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the 1126 offset to the entry. */ 1127 HOWTO (R_PPC_GOT_TPREL16, 1128 0, /* rightshift */ 1129 1, /* size (0 = byte, 1 = short, 2 = long) */ 1130 16, /* bitsize */ 1131 FALSE, /* pc_relative */ 1132 0, /* bitpos */ 1133 complain_overflow_signed, /* complain_on_overflow */ 1134 ppc_elf_unhandled_reloc, /* special_function */ 1135 "R_PPC_GOT_TPREL16", /* name */ 1136 FALSE, /* partial_inplace */ 1137 0, /* src_mask */ 1138 0xffff, /* dst_mask */ 1139 FALSE), /* pcrel_offset */ 1140 1141 /* Like GOT_TPREL16, but no overflow. */ 1142 HOWTO (R_PPC_GOT_TPREL16_LO, 1143 0, /* rightshift */ 1144 1, /* size (0 = byte, 1 = short, 2 = long) */ 1145 16, /* bitsize */ 1146 FALSE, /* pc_relative */ 1147 0, /* bitpos */ 1148 complain_overflow_dont, /* complain_on_overflow */ 1149 ppc_elf_unhandled_reloc, /* special_function */ 1150 "R_PPC_GOT_TPREL16_LO", /* name */ 1151 FALSE, /* partial_inplace */ 1152 0, /* src_mask */ 1153 0xffff, /* dst_mask */ 1154 FALSE), /* pcrel_offset */ 1155 1156 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */ 1157 HOWTO (R_PPC_GOT_TPREL16_HI, 1158 16, /* rightshift */ 1159 1, /* size (0 = byte, 1 = short, 2 = long) */ 1160 16, /* bitsize */ 1161 FALSE, /* pc_relative */ 1162 0, /* bitpos */ 1163 complain_overflow_dont, /* complain_on_overflow */ 1164 ppc_elf_unhandled_reloc, /* special_function */ 1165 "R_PPC_GOT_TPREL16_HI", /* name */ 1166 FALSE, /* partial_inplace */ 1167 0, /* src_mask */ 1168 0xffff, /* dst_mask */ 1169 FALSE), /* pcrel_offset */ 1170 1171 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */ 1172 HOWTO (R_PPC_GOT_TPREL16_HA, 1173 16, /* rightshift */ 1174 1, /* size (0 = byte, 1 = short, 2 = long) */ 1175 16, /* bitsize */ 1176 FALSE, /* pc_relative */ 1177 0, /* bitpos */ 1178 complain_overflow_dont, /* complain_on_overflow */ 1179 ppc_elf_unhandled_reloc, /* special_function */ 1180 "R_PPC_GOT_TPREL16_HA", /* name */ 1181 FALSE, /* partial_inplace */ 1182 0, /* src_mask */ 1183 0xffff, /* dst_mask */ 1184 FALSE), /* pcrel_offset */ 1185 1186 /* The remaining relocs are from the Embedded ELF ABI, and are not 1187 in the SVR4 ELF ABI. */ 1188 1189 /* 32 bit value resulting from the addend minus the symbol. */ 1190 HOWTO (R_PPC_EMB_NADDR32, /* type */ 1191 0, /* rightshift */ 1192 2, /* size (0 = byte, 1 = short, 2 = long) */ 1193 32, /* bitsize */ 1194 FALSE, /* pc_relative */ 1195 0, /* bitpos */ 1196 complain_overflow_bitfield, /* complain_on_overflow */ 1197 bfd_elf_generic_reloc, /* special_function */ 1198 "R_PPC_EMB_NADDR32", /* name */ 1199 FALSE, /* partial_inplace */ 1200 0, /* src_mask */ 1201 0xffffffff, /* dst_mask */ 1202 FALSE), /* pcrel_offset */ 1203 1204 /* 16 bit value resulting from the addend minus the symbol. */ 1205 HOWTO (R_PPC_EMB_NADDR16, /* type */ 1206 0, /* rightshift */ 1207 1, /* size (0 = byte, 1 = short, 2 = long) */ 1208 16, /* bitsize */ 1209 FALSE, /* pc_relative */ 1210 0, /* bitpos */ 1211 complain_overflow_bitfield, /* complain_on_overflow */ 1212 bfd_elf_generic_reloc, /* special_function */ 1213 "R_PPC_EMB_NADDR16", /* name */ 1214 FALSE, /* partial_inplace */ 1215 0, /* src_mask */ 1216 0xffff, /* dst_mask */ 1217 FALSE), /* pcrel_offset */ 1218 1219 /* 16 bit value resulting from the addend minus the symbol. */ 1220 HOWTO (R_PPC_EMB_NADDR16_LO, /* type */ 1221 0, /* rightshift */ 1222 1, /* size (0 = byte, 1 = short, 2 = long) */ 1223 16, /* bitsize */ 1224 FALSE, /* pc_relative */ 1225 0, /* bitpos */ 1226 complain_overflow_dont,/* complain_on_overflow */ 1227 bfd_elf_generic_reloc, /* special_function */ 1228 "R_PPC_EMB_ADDR16_LO", /* name */ 1229 FALSE, /* partial_inplace */ 1230 0, /* src_mask */ 1231 0xffff, /* dst_mask */ 1232 FALSE), /* pcrel_offset */ 1233 1234 /* The high order 16 bits of the addend minus the symbol. */ 1235 HOWTO (R_PPC_EMB_NADDR16_HI, /* type */ 1236 16, /* rightshift */ 1237 1, /* size (0 = byte, 1 = short, 2 = long) */ 1238 16, /* bitsize */ 1239 FALSE, /* pc_relative */ 1240 0, /* bitpos */ 1241 complain_overflow_dont, /* complain_on_overflow */ 1242 bfd_elf_generic_reloc, /* special_function */ 1243 "R_PPC_EMB_NADDR16_HI", /* name */ 1244 FALSE, /* partial_inplace */ 1245 0, /* src_mask */ 1246 0xffff, /* dst_mask */ 1247 FALSE), /* pcrel_offset */ 1248 1249 /* The high order 16 bits of the result of the addend minus the address, 1250 plus 1 if the contents of the low 16 bits, treated as a signed number, 1251 is negative. */ 1252 HOWTO (R_PPC_EMB_NADDR16_HA, /* type */ 1253 16, /* rightshift */ 1254 1, /* size (0 = byte, 1 = short, 2 = long) */ 1255 16, /* bitsize */ 1256 FALSE, /* pc_relative */ 1257 0, /* bitpos */ 1258 complain_overflow_dont, /* complain_on_overflow */ 1259 ppc_elf_addr16_ha_reloc, /* special_function */ 1260 "R_PPC_EMB_NADDR16_HA", /* name */ 1261 FALSE, /* partial_inplace */ 1262 0, /* src_mask */ 1263 0xffff, /* dst_mask */ 1264 FALSE), /* pcrel_offset */ 1265 1266 /* 16 bit value resulting from allocating a 4 byte word to hold an 1267 address in the .sdata section, and returning the offset from 1268 _SDA_BASE_ for that relocation. */ 1269 HOWTO (R_PPC_EMB_SDAI16, /* type */ 1270 0, /* rightshift */ 1271 1, /* size (0 = byte, 1 = short, 2 = long) */ 1272 16, /* bitsize */ 1273 FALSE, /* pc_relative */ 1274 0, /* bitpos */ 1275 complain_overflow_bitfield, /* complain_on_overflow */ 1276 bfd_elf_generic_reloc, /* special_function */ 1277 "R_PPC_EMB_SDAI16", /* name */ 1278 FALSE, /* partial_inplace */ 1279 0, /* src_mask */ 1280 0xffff, /* dst_mask */ 1281 FALSE), /* pcrel_offset */ 1282 1283 /* 16 bit value resulting from allocating a 4 byte word to hold an 1284 address in the .sdata2 section, and returning the offset from 1285 _SDA2_BASE_ for that relocation. */ 1286 HOWTO (R_PPC_EMB_SDA2I16, /* type */ 1287 0, /* rightshift */ 1288 1, /* size (0 = byte, 1 = short, 2 = long) */ 1289 16, /* bitsize */ 1290 FALSE, /* pc_relative */ 1291 0, /* bitpos */ 1292 complain_overflow_bitfield, /* complain_on_overflow */ 1293 bfd_elf_generic_reloc, /* special_function */ 1294 "R_PPC_EMB_SDA2I16", /* name */ 1295 FALSE, /* partial_inplace */ 1296 0, /* src_mask */ 1297 0xffff, /* dst_mask */ 1298 FALSE), /* pcrel_offset */ 1299 1300 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with 1301 small data items. */ 1302 HOWTO (R_PPC_EMB_SDA2REL, /* type */ 1303 0, /* rightshift */ 1304 1, /* size (0 = byte, 1 = short, 2 = long) */ 1305 16, /* bitsize */ 1306 FALSE, /* pc_relative */ 1307 0, /* bitpos */ 1308 complain_overflow_signed, /* complain_on_overflow */ 1309 bfd_elf_generic_reloc, /* special_function */ 1310 "R_PPC_EMB_SDA2REL", /* name */ 1311 FALSE, /* partial_inplace */ 1312 0, /* src_mask */ 1313 0xffff, /* dst_mask */ 1314 FALSE), /* pcrel_offset */ 1315 1316 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit 1317 signed offset from the appropriate base, and filling in the register 1318 field with the appropriate register (0, 2, or 13). */ 1319 HOWTO (R_PPC_EMB_SDA21, /* type */ 1320 0, /* rightshift */ 1321 2, /* size (0 = byte, 1 = short, 2 = long) */ 1322 16, /* bitsize */ 1323 FALSE, /* pc_relative */ 1324 0, /* bitpos */ 1325 complain_overflow_signed, /* complain_on_overflow */ 1326 bfd_elf_generic_reloc, /* special_function */ 1327 "R_PPC_EMB_SDA21", /* name */ 1328 FALSE, /* partial_inplace */ 1329 0, /* src_mask */ 1330 0xffff, /* dst_mask */ 1331 FALSE), /* pcrel_offset */ 1332 1333 /* Relocation not handled: R_PPC_EMB_MRKREF */ 1334 /* Relocation not handled: R_PPC_EMB_RELSEC16 */ 1335 /* Relocation not handled: R_PPC_EMB_RELST_LO */ 1336 /* Relocation not handled: R_PPC_EMB_RELST_HI */ 1337 /* Relocation not handled: R_PPC_EMB_RELST_HA */ 1338 /* Relocation not handled: R_PPC_EMB_BIT_FLD */ 1339 1340 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling 1341 in the 16 bit signed offset from the appropriate base, and filling in the 1342 register field with the appropriate register (0, 2, or 13). */ 1343 HOWTO (R_PPC_EMB_RELSDA, /* type */ 1344 0, /* rightshift */ 1345 1, /* size (0 = byte, 1 = short, 2 = long) */ 1346 16, /* bitsize */ 1347 TRUE, /* pc_relative */ 1348 0, /* bitpos */ 1349 complain_overflow_signed, /* complain_on_overflow */ 1350 bfd_elf_generic_reloc, /* special_function */ 1351 "R_PPC_EMB_RELSDA", /* name */ 1352 FALSE, /* partial_inplace */ 1353 0, /* src_mask */ 1354 0xffff, /* dst_mask */ 1355 FALSE), /* pcrel_offset */ 1356 1357 /* A 16 bit relative relocation. */ 1358 HOWTO (R_PPC_REL16, /* type */ 1359 0, /* rightshift */ 1360 1, /* size (0 = byte, 1 = short, 2 = long) */ 1361 16, /* bitsize */ 1362 TRUE, /* pc_relative */ 1363 0, /* bitpos */ 1364 complain_overflow_bitfield, /* complain_on_overflow */ 1365 bfd_elf_generic_reloc, /* special_function */ 1366 "R_PPC_REL16", /* name */ 1367 FALSE, /* partial_inplace */ 1368 0, /* src_mask */ 1369 0xffff, /* dst_mask */ 1370 TRUE), /* pcrel_offset */ 1371 1372 /* A 16 bit relative relocation without overflow. */ 1373 HOWTO (R_PPC_REL16_LO, /* type */ 1374 0, /* rightshift */ 1375 1, /* size (0 = byte, 1 = short, 2 = long) */ 1376 16, /* bitsize */ 1377 TRUE, /* pc_relative */ 1378 0, /* bitpos */ 1379 complain_overflow_dont,/* complain_on_overflow */ 1380 bfd_elf_generic_reloc, /* special_function */ 1381 "R_PPC_REL16_LO", /* name */ 1382 FALSE, /* partial_inplace */ 1383 0, /* src_mask */ 1384 0xffff, /* dst_mask */ 1385 TRUE), /* pcrel_offset */ 1386 1387 /* The high order 16 bits of a relative address. */ 1388 HOWTO (R_PPC_REL16_HI, /* type */ 1389 16, /* rightshift */ 1390 1, /* size (0 = byte, 1 = short, 2 = long) */ 1391 16, /* bitsize */ 1392 TRUE, /* pc_relative */ 1393 0, /* bitpos */ 1394 complain_overflow_dont, /* complain_on_overflow */ 1395 bfd_elf_generic_reloc, /* special_function */ 1396 "R_PPC_REL16_HI", /* name */ 1397 FALSE, /* partial_inplace */ 1398 0, /* src_mask */ 1399 0xffff, /* dst_mask */ 1400 TRUE), /* pcrel_offset */ 1401 1402 /* The high order 16 bits of a relative address, plus 1 if the contents of 1403 the low 16 bits, treated as a signed number, is negative. */ 1404 HOWTO (R_PPC_REL16_HA, /* type */ 1405 16, /* rightshift */ 1406 1, /* size (0 = byte, 1 = short, 2 = long) */ 1407 16, /* bitsize */ 1408 TRUE, /* pc_relative */ 1409 0, /* bitpos */ 1410 complain_overflow_dont, /* complain_on_overflow */ 1411 ppc_elf_addr16_ha_reloc, /* special_function */ 1412 "R_PPC_REL16_HA", /* name */ 1413 FALSE, /* partial_inplace */ 1414 0, /* src_mask */ 1415 0xffff, /* dst_mask */ 1416 TRUE), /* pcrel_offset */ 1417 1418 /* GNU extension to record C++ vtable hierarchy. */ 1419 HOWTO (R_PPC_GNU_VTINHERIT, /* type */ 1420 0, /* rightshift */ 1421 0, /* size (0 = byte, 1 = short, 2 = long) */ 1422 0, /* bitsize */ 1423 FALSE, /* pc_relative */ 1424 0, /* bitpos */ 1425 complain_overflow_dont, /* complain_on_overflow */ 1426 NULL, /* special_function */ 1427 "R_PPC_GNU_VTINHERIT", /* name */ 1428 FALSE, /* partial_inplace */ 1429 0, /* src_mask */ 1430 0, /* dst_mask */ 1431 FALSE), /* pcrel_offset */ 1432 1433 /* GNU extension to record C++ vtable member usage. */ 1434 HOWTO (R_PPC_GNU_VTENTRY, /* type */ 1435 0, /* rightshift */ 1436 0, /* size (0 = byte, 1 = short, 2 = long) */ 1437 0, /* bitsize */ 1438 FALSE, /* pc_relative */ 1439 0, /* bitpos */ 1440 complain_overflow_dont, /* complain_on_overflow */ 1441 NULL, /* special_function */ 1442 "R_PPC_GNU_VTENTRY", /* name */ 1443 FALSE, /* partial_inplace */ 1444 0, /* src_mask */ 1445 0, /* dst_mask */ 1446 FALSE), /* pcrel_offset */ 1447 1448 /* Phony reloc to handle AIX style TOC entries. */ 1449 HOWTO (R_PPC_TOC16, /* type */ 1450 0, /* rightshift */ 1451 1, /* size (0 = byte, 1 = short, 2 = long) */ 1452 16, /* bitsize */ 1453 FALSE, /* pc_relative */ 1454 0, /* bitpos */ 1455 complain_overflow_signed, /* complain_on_overflow */ 1456 bfd_elf_generic_reloc, /* special_function */ 1457 "R_PPC_TOC16", /* name */ 1458 FALSE, /* partial_inplace */ 1459 0, /* src_mask */ 1460 0xffff, /* dst_mask */ 1461 FALSE), /* pcrel_offset */ 1462 }; 1463 1464 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */ 1465 1466 static void 1467 ppc_elf_howto_init (void) 1468 { 1469 unsigned int i, type; 1470 1471 for (i = 0; 1472 i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); 1473 i++) 1474 { 1475 type = ppc_elf_howto_raw[i].type; 1476 if (type >= (sizeof (ppc_elf_howto_table) 1477 / sizeof (ppc_elf_howto_table[0]))) 1478 abort (); 1479 ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i]; 1480 } 1481 } 1482 1483 static reloc_howto_type * 1484 ppc_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1485 bfd_reloc_code_real_type code) 1486 { 1487 enum elf_ppc_reloc_type r; 1488 1489 /* Initialize howto table if not already done. */ 1490 if (!ppc_elf_howto_table[R_PPC_ADDR32]) 1491 ppc_elf_howto_init (); 1492 1493 switch (code) 1494 { 1495 default: 1496 return NULL; 1497 1498 case BFD_RELOC_NONE: r = R_PPC_NONE; break; 1499 case BFD_RELOC_32: r = R_PPC_ADDR32; break; 1500 case BFD_RELOC_PPC_BA26: r = R_PPC_ADDR24; break; 1501 case BFD_RELOC_16: r = R_PPC_ADDR16; break; 1502 case BFD_RELOC_LO16: r = R_PPC_ADDR16_LO; break; 1503 case BFD_RELOC_HI16: r = R_PPC_ADDR16_HI; break; 1504 case BFD_RELOC_HI16_S: r = R_PPC_ADDR16_HA; break; 1505 case BFD_RELOC_PPC_BA16: r = R_PPC_ADDR14; break; 1506 case BFD_RELOC_PPC_BA16_BRTAKEN: r = R_PPC_ADDR14_BRTAKEN; break; 1507 case BFD_RELOC_PPC_BA16_BRNTAKEN: r = R_PPC_ADDR14_BRNTAKEN; break; 1508 case BFD_RELOC_PPC_B26: r = R_PPC_REL24; break; 1509 case BFD_RELOC_PPC_B16: r = R_PPC_REL14; break; 1510 case BFD_RELOC_PPC_B16_BRTAKEN: r = R_PPC_REL14_BRTAKEN; break; 1511 case BFD_RELOC_PPC_B16_BRNTAKEN: r = R_PPC_REL14_BRNTAKEN; break; 1512 case BFD_RELOC_16_GOTOFF: r = R_PPC_GOT16; break; 1513 case BFD_RELOC_LO16_GOTOFF: r = R_PPC_GOT16_LO; break; 1514 case BFD_RELOC_HI16_GOTOFF: r = R_PPC_GOT16_HI; break; 1515 case BFD_RELOC_HI16_S_GOTOFF: r = R_PPC_GOT16_HA; break; 1516 case BFD_RELOC_24_PLT_PCREL: r = R_PPC_PLTREL24; break; 1517 case BFD_RELOC_PPC_COPY: r = R_PPC_COPY; break; 1518 case BFD_RELOC_PPC_GLOB_DAT: r = R_PPC_GLOB_DAT; break; 1519 case BFD_RELOC_PPC_LOCAL24PC: r = R_PPC_LOCAL24PC; break; 1520 case BFD_RELOC_32_PCREL: r = R_PPC_REL32; break; 1521 case BFD_RELOC_32_PLTOFF: r = R_PPC_PLT32; break; 1522 case BFD_RELOC_32_PLT_PCREL: r = R_PPC_PLTREL32; break; 1523 case BFD_RELOC_LO16_PLTOFF: r = R_PPC_PLT16_LO; break; 1524 case BFD_RELOC_HI16_PLTOFF: r = R_PPC_PLT16_HI; break; 1525 case BFD_RELOC_HI16_S_PLTOFF: r = R_PPC_PLT16_HA; break; 1526 case BFD_RELOC_GPREL16: r = R_PPC_SDAREL16; break; 1527 case BFD_RELOC_16_BASEREL: r = R_PPC_SECTOFF; break; 1528 case BFD_RELOC_LO16_BASEREL: r = R_PPC_SECTOFF_LO; break; 1529 case BFD_RELOC_HI16_BASEREL: r = R_PPC_SECTOFF_HI; break; 1530 case BFD_RELOC_HI16_S_BASEREL: r = R_PPC_SECTOFF_HA; break; 1531 case BFD_RELOC_CTOR: r = R_PPC_ADDR32; break; 1532 case BFD_RELOC_PPC_TOC16: r = R_PPC_TOC16; break; 1533 case BFD_RELOC_PPC_TLS: r = R_PPC_TLS; break; 1534 case BFD_RELOC_PPC_DTPMOD: r = R_PPC_DTPMOD32; break; 1535 case BFD_RELOC_PPC_TPREL16: r = R_PPC_TPREL16; break; 1536 case BFD_RELOC_PPC_TPREL16_LO: r = R_PPC_TPREL16_LO; break; 1537 case BFD_RELOC_PPC_TPREL16_HI: r = R_PPC_TPREL16_HI; break; 1538 case BFD_RELOC_PPC_TPREL16_HA: r = R_PPC_TPREL16_HA; break; 1539 case BFD_RELOC_PPC_TPREL: r = R_PPC_TPREL32; break; 1540 case BFD_RELOC_PPC_DTPREL16: r = R_PPC_DTPREL16; break; 1541 case BFD_RELOC_PPC_DTPREL16_LO: r = R_PPC_DTPREL16_LO; break; 1542 case BFD_RELOC_PPC_DTPREL16_HI: r = R_PPC_DTPREL16_HI; break; 1543 case BFD_RELOC_PPC_DTPREL16_HA: r = R_PPC_DTPREL16_HA; break; 1544 case BFD_RELOC_PPC_DTPREL: r = R_PPC_DTPREL32; break; 1545 case BFD_RELOC_PPC_GOT_TLSGD16: r = R_PPC_GOT_TLSGD16; break; 1546 case BFD_RELOC_PPC_GOT_TLSGD16_LO: r = R_PPC_GOT_TLSGD16_LO; break; 1547 case BFD_RELOC_PPC_GOT_TLSGD16_HI: r = R_PPC_GOT_TLSGD16_HI; break; 1548 case BFD_RELOC_PPC_GOT_TLSGD16_HA: r = R_PPC_GOT_TLSGD16_HA; break; 1549 case BFD_RELOC_PPC_GOT_TLSLD16: r = R_PPC_GOT_TLSLD16; break; 1550 case BFD_RELOC_PPC_GOT_TLSLD16_LO: r = R_PPC_GOT_TLSLD16_LO; break; 1551 case BFD_RELOC_PPC_GOT_TLSLD16_HI: r = R_PPC_GOT_TLSLD16_HI; break; 1552 case BFD_RELOC_PPC_GOT_TLSLD16_HA: r = R_PPC_GOT_TLSLD16_HA; break; 1553 case BFD_RELOC_PPC_GOT_TPREL16: r = R_PPC_GOT_TPREL16; break; 1554 case BFD_RELOC_PPC_GOT_TPREL16_LO: r = R_PPC_GOT_TPREL16_LO; break; 1555 case BFD_RELOC_PPC_GOT_TPREL16_HI: r = R_PPC_GOT_TPREL16_HI; break; 1556 case BFD_RELOC_PPC_GOT_TPREL16_HA: r = R_PPC_GOT_TPREL16_HA; break; 1557 case BFD_RELOC_PPC_GOT_DTPREL16: r = R_PPC_GOT_DTPREL16; break; 1558 case BFD_RELOC_PPC_GOT_DTPREL16_LO: r = R_PPC_GOT_DTPREL16_LO; break; 1559 case BFD_RELOC_PPC_GOT_DTPREL16_HI: r = R_PPC_GOT_DTPREL16_HI; break; 1560 case BFD_RELOC_PPC_GOT_DTPREL16_HA: r = R_PPC_GOT_DTPREL16_HA; break; 1561 case BFD_RELOC_PPC_EMB_NADDR32: r = R_PPC_EMB_NADDR32; break; 1562 case BFD_RELOC_PPC_EMB_NADDR16: r = R_PPC_EMB_NADDR16; break; 1563 case BFD_RELOC_PPC_EMB_NADDR16_LO: r = R_PPC_EMB_NADDR16_LO; break; 1564 case BFD_RELOC_PPC_EMB_NADDR16_HI: r = R_PPC_EMB_NADDR16_HI; break; 1565 case BFD_RELOC_PPC_EMB_NADDR16_HA: r = R_PPC_EMB_NADDR16_HA; break; 1566 case BFD_RELOC_PPC_EMB_SDAI16: r = R_PPC_EMB_SDAI16; break; 1567 case BFD_RELOC_PPC_EMB_SDA2I16: r = R_PPC_EMB_SDA2I16; break; 1568 case BFD_RELOC_PPC_EMB_SDA2REL: r = R_PPC_EMB_SDA2REL; break; 1569 case BFD_RELOC_PPC_EMB_SDA21: r = R_PPC_EMB_SDA21; break; 1570 case BFD_RELOC_PPC_EMB_MRKREF: r = R_PPC_EMB_MRKREF; break; 1571 case BFD_RELOC_PPC_EMB_RELSEC16: r = R_PPC_EMB_RELSEC16; break; 1572 case BFD_RELOC_PPC_EMB_RELST_LO: r = R_PPC_EMB_RELST_LO; break; 1573 case BFD_RELOC_PPC_EMB_RELST_HI: r = R_PPC_EMB_RELST_HI; break; 1574 case BFD_RELOC_PPC_EMB_RELST_HA: r = R_PPC_EMB_RELST_HA; break; 1575 case BFD_RELOC_PPC_EMB_BIT_FLD: r = R_PPC_EMB_BIT_FLD; break; 1576 case BFD_RELOC_PPC_EMB_RELSDA: r = R_PPC_EMB_RELSDA; break; 1577 case BFD_RELOC_16_PCREL: r = R_PPC_REL16; break; 1578 case BFD_RELOC_LO16_PCREL: r = R_PPC_REL16_LO; break; 1579 case BFD_RELOC_HI16_PCREL: r = R_PPC_REL16_HI; break; 1580 case BFD_RELOC_HI16_S_PCREL: r = R_PPC_REL16_HA; break; 1581 case BFD_RELOC_VTABLE_INHERIT: r = R_PPC_GNU_VTINHERIT; break; 1582 case BFD_RELOC_VTABLE_ENTRY: r = R_PPC_GNU_VTENTRY; break; 1583 } 1584 1585 return ppc_elf_howto_table[r]; 1586 }; 1587 1588 static reloc_howto_type * 1589 ppc_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1590 const char *r_name) 1591 { 1592 unsigned int i; 1593 1594 for (i = 0; 1595 i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); 1596 i++) 1597 if (ppc_elf_howto_raw[i].name != NULL 1598 && strcasecmp (ppc_elf_howto_raw[i].name, r_name) == 0) 1599 return &ppc_elf_howto_raw[i]; 1600 1601 return NULL; 1602 } 1603 1604 /* Set the howto pointer for a PowerPC ELF reloc. */ 1605 1606 static void 1607 ppc_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 1608 arelent *cache_ptr, 1609 Elf_Internal_Rela *dst) 1610 { 1611 /* Initialize howto table if not already done. */ 1612 if (!ppc_elf_howto_table[R_PPC_ADDR32]) 1613 ppc_elf_howto_init (); 1614 1615 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max); 1616 cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)]; 1617 1618 /* Just because the above assert didn't trigger doesn't mean that 1619 ELF32_R_TYPE (dst->r_info) is necessarily a valid relocation. */ 1620 if (!cache_ptr->howto) 1621 { 1622 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 1623 abfd, ELF32_R_TYPE (dst->r_info)); 1624 bfd_set_error (bfd_error_bad_value); 1625 1626 cache_ptr->howto = ppc_elf_howto_table[R_PPC_NONE]; 1627 } 1628 } 1629 1630 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */ 1631 1632 static bfd_reloc_status_type 1633 ppc_elf_addr16_ha_reloc (bfd *abfd ATTRIBUTE_UNUSED, 1634 arelent *reloc_entry, 1635 asymbol *symbol, 1636 void *data ATTRIBUTE_UNUSED, 1637 asection *input_section, 1638 bfd *output_bfd, 1639 char **error_message ATTRIBUTE_UNUSED) 1640 { 1641 bfd_vma relocation; 1642 1643 if (output_bfd != NULL) 1644 { 1645 reloc_entry->address += input_section->output_offset; 1646 return bfd_reloc_ok; 1647 } 1648 1649 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1650 return bfd_reloc_outofrange; 1651 1652 if (bfd_is_com_section (symbol->section)) 1653 relocation = 0; 1654 else 1655 relocation = symbol->value; 1656 1657 relocation += symbol->section->output_section->vma; 1658 relocation += symbol->section->output_offset; 1659 relocation += reloc_entry->addend; 1660 if (reloc_entry->howto->pc_relative) 1661 relocation -= reloc_entry->address; 1662 1663 reloc_entry->addend += (relocation & 0x8000) << 1; 1664 1665 return bfd_reloc_continue; 1666 } 1667 1668 static bfd_reloc_status_type 1669 ppc_elf_unhandled_reloc (bfd *abfd, 1670 arelent *reloc_entry, 1671 asymbol *symbol, 1672 void *data, 1673 asection *input_section, 1674 bfd *output_bfd, 1675 char **error_message) 1676 { 1677 /* If this is a relocatable link (output_bfd test tells us), just 1678 call the generic function. Any adjustment will be done at final 1679 link time. */ 1680 if (output_bfd != NULL) 1681 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1682 input_section, output_bfd, error_message); 1683 1684 if (error_message != NULL) 1685 { 1686 static char buf[60]; 1687 sprintf (buf, _("generic linker can't handle %s"), 1688 reloc_entry->howto->name); 1689 *error_message = buf; 1690 } 1691 return bfd_reloc_dangerous; 1692 } 1693 1694 /* Sections created by the linker. */ 1695 1696 typedef struct elf_linker_section 1697 { 1698 /* Pointer to the bfd section. */ 1699 asection *section; 1700 /* Section name. */ 1701 const char *name; 1702 /* Associated bss section name. */ 1703 const char *bss_name; 1704 /* Associated symbol name. */ 1705 const char *sym_name; 1706 /* Associated symbol. */ 1707 struct elf_link_hash_entry *sym; 1708 } elf_linker_section_t; 1709 1710 /* Linked list of allocated pointer entries. This hangs off of the 1711 symbol lists, and provides allows us to return different pointers, 1712 based on different addend's. */ 1713 1714 typedef struct elf_linker_section_pointers 1715 { 1716 /* next allocated pointer for this symbol */ 1717 struct elf_linker_section_pointers *next; 1718 /* offset of pointer from beginning of section */ 1719 bfd_vma offset; 1720 /* addend used */ 1721 bfd_vma addend; 1722 /* which linker section this is */ 1723 elf_linker_section_t *lsect; 1724 } elf_linker_section_pointers_t; 1725 1726 struct ppc_elf_obj_tdata 1727 { 1728 struct elf_obj_tdata elf; 1729 1730 /* A mapping from local symbols to offsets into the various linker 1731 sections added. This is index by the symbol index. */ 1732 elf_linker_section_pointers_t **linker_section_pointers; 1733 1734 /* Flags used to auto-detect plt type. */ 1735 unsigned int makes_plt_call : 1; 1736 unsigned int has_rel16 : 1; 1737 }; 1738 1739 #define ppc_elf_tdata(bfd) \ 1740 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any) 1741 1742 #define elf_local_ptr_offsets(bfd) \ 1743 (ppc_elf_tdata (bfd)->linker_section_pointers) 1744 1745 #define is_ppc_elf(bfd) \ 1746 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 1747 && elf_object_id (bfd) == PPC32_ELF_TDATA) 1748 1749 /* Override the generic function because we store some extras. */ 1750 1751 static bfd_boolean 1752 ppc_elf_mkobject (bfd *abfd) 1753 { 1754 return bfd_elf_allocate_object (abfd, sizeof (struct ppc_elf_obj_tdata), 1755 PPC32_ELF_TDATA); 1756 } 1757 1758 /* Fix bad default arch selected for a 32 bit input bfd when the 1759 default is 64 bit. */ 1760 1761 static bfd_boolean 1762 ppc_elf_object_p (bfd *abfd) 1763 { 1764 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 64) 1765 { 1766 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd); 1767 1768 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS32) 1769 { 1770 /* Relies on arch after 64 bit default being 32 bit default. */ 1771 abfd->arch_info = abfd->arch_info->next; 1772 BFD_ASSERT (abfd->arch_info->bits_per_word == 32); 1773 } 1774 } 1775 return TRUE; 1776 } 1777 1778 /* Function to set whether a module needs the -mrelocatable bit set. */ 1779 1780 static bfd_boolean 1781 ppc_elf_set_private_flags (bfd *abfd, flagword flags) 1782 { 1783 BFD_ASSERT (!elf_flags_init (abfd) 1784 || elf_elfheader (abfd)->e_flags == flags); 1785 1786 elf_elfheader (abfd)->e_flags = flags; 1787 elf_flags_init (abfd) = TRUE; 1788 return TRUE; 1789 } 1790 1791 /* Support for core dump NOTE sections. */ 1792 1793 static bfd_boolean 1794 ppc_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 1795 { 1796 int offset; 1797 unsigned int size; 1798 1799 switch (note->descsz) 1800 { 1801 default: 1802 return FALSE; 1803 1804 case 268: /* Linux/PPC. */ 1805 /* pr_cursig */ 1806 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 1807 1808 /* pr_pid */ 1809 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 1810 1811 /* pr_reg */ 1812 offset = 72; 1813 size = 192; 1814 1815 break; 1816 } 1817 1818 /* Make a ".reg/999" section. */ 1819 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 1820 size, note->descpos + offset); 1821 } 1822 1823 static bfd_boolean 1824 ppc_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 1825 { 1826 switch (note->descsz) 1827 { 1828 default: 1829 return FALSE; 1830 1831 case 128: /* Linux/PPC elf_prpsinfo. */ 1832 elf_tdata (abfd)->core_program 1833 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16); 1834 elf_tdata (abfd)->core_command 1835 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80); 1836 } 1837 1838 /* Note that for some reason, a spurious space is tacked 1839 onto the end of the args in some (at least one anyway) 1840 implementations, so strip it off if it exists. */ 1841 1842 { 1843 char *command = elf_tdata (abfd)->core_command; 1844 int n = strlen (command); 1845 1846 if (0 < n && command[n - 1] == ' ') 1847 command[n - 1] = '\0'; 1848 } 1849 1850 return TRUE; 1851 } 1852 1853 static char * 1854 ppc_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type, ...) 1855 { 1856 switch (note_type) 1857 { 1858 default: 1859 return NULL; 1860 1861 case NT_PRPSINFO: 1862 { 1863 char data[128]; 1864 va_list ap; 1865 1866 va_start (ap, note_type); 1867 memset (data, 0, 32); 1868 strncpy (data + 32, va_arg (ap, const char *), 16); 1869 strncpy (data + 48, va_arg (ap, const char *), 80); 1870 va_end (ap); 1871 return elfcore_write_note (abfd, buf, bufsiz, 1872 "CORE", note_type, data, sizeof (data)); 1873 } 1874 1875 case NT_PRSTATUS: 1876 { 1877 char data[268]; 1878 va_list ap; 1879 long pid; 1880 int cursig; 1881 const void *greg; 1882 1883 va_start (ap, note_type); 1884 memset (data, 0, 72); 1885 pid = va_arg (ap, long); 1886 bfd_put_32 (abfd, pid, data + 24); 1887 cursig = va_arg (ap, int); 1888 bfd_put_16 (abfd, cursig, data + 12); 1889 greg = va_arg (ap, const void *); 1890 memcpy (data + 72, greg, 192); 1891 memset (data + 264, 0, 4); 1892 va_end (ap); 1893 return elfcore_write_note (abfd, buf, bufsiz, 1894 "CORE", note_type, data, sizeof (data)); 1895 } 1896 } 1897 } 1898 1899 /* Return address for Ith PLT stub in section PLT, for relocation REL 1900 or (bfd_vma) -1 if it should not be included. */ 1901 1902 static bfd_vma 1903 ppc_elf_plt_sym_val (bfd_vma i ATTRIBUTE_UNUSED, 1904 const asection *plt ATTRIBUTE_UNUSED, 1905 const arelent *rel) 1906 { 1907 return rel->address; 1908 } 1909 1910 /* Handle a PowerPC specific section when reading an object file. This 1911 is called when bfd_section_from_shdr finds a section with an unknown 1912 type. */ 1913 1914 static bfd_boolean 1915 ppc_elf_section_from_shdr (bfd *abfd, 1916 Elf_Internal_Shdr *hdr, 1917 const char *name, 1918 int shindex) 1919 { 1920 asection *newsect; 1921 flagword flags; 1922 1923 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) 1924 return FALSE; 1925 1926 newsect = hdr->bfd_section; 1927 flags = bfd_get_section_flags (abfd, newsect); 1928 if (hdr->sh_flags & SHF_EXCLUDE) 1929 flags |= SEC_EXCLUDE; 1930 1931 if (hdr->sh_type == SHT_ORDERED) 1932 flags |= SEC_SORT_ENTRIES; 1933 1934 bfd_set_section_flags (abfd, newsect, flags); 1935 return TRUE; 1936 } 1937 1938 /* Set up any other section flags and such that may be necessary. */ 1939 1940 static bfd_boolean 1941 ppc_elf_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 1942 Elf_Internal_Shdr *shdr, 1943 asection *asect) 1944 { 1945 if ((asect->flags & (SEC_GROUP | SEC_EXCLUDE)) == SEC_EXCLUDE) 1946 shdr->sh_flags |= SHF_EXCLUDE; 1947 1948 if ((asect->flags & SEC_SORT_ENTRIES) != 0) 1949 shdr->sh_type = SHT_ORDERED; 1950 1951 return TRUE; 1952 } 1953 1954 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we 1955 need to bump up the number of section headers. */ 1956 1957 static int 1958 ppc_elf_additional_program_headers (bfd *abfd, 1959 struct bfd_link_info *info ATTRIBUTE_UNUSED) 1960 { 1961 asection *s; 1962 int ret = 0; 1963 1964 s = bfd_get_section_by_name (abfd, ".sbss2"); 1965 if (s != NULL && (s->flags & SEC_ALLOC) != 0) 1966 ++ret; 1967 1968 s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0"); 1969 if (s != NULL && (s->flags & SEC_ALLOC) != 0) 1970 ++ret; 1971 1972 return ret; 1973 } 1974 1975 /* Add extra PPC sections -- Note, for now, make .sbss2 and 1976 .PPC.EMB.sbss0 a normal section, and not a bss section so 1977 that the linker doesn't crater when trying to make more than 1978 2 sections. */ 1979 1980 static const struct bfd_elf_special_section ppc_elf_special_sections[] = 1981 { 1982 { STRING_COMMA_LEN (".plt"), 0, SHT_NOBITS, SHF_ALLOC + SHF_EXECINSTR }, 1983 { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 1984 { STRING_COMMA_LEN (".sbss2"), -2, SHT_PROGBITS, SHF_ALLOC }, 1985 { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 1986 { STRING_COMMA_LEN (".sdata2"), -2, SHT_PROGBITS, SHF_ALLOC }, 1987 { STRING_COMMA_LEN (".tags"), 0, SHT_ORDERED, SHF_ALLOC }, 1988 { STRING_COMMA_LEN (".PPC.EMB.apuinfo"), 0, SHT_NOTE, 0 }, 1989 { STRING_COMMA_LEN (".PPC.EMB.sbss0"), 0, SHT_PROGBITS, SHF_ALLOC }, 1990 { STRING_COMMA_LEN (".PPC.EMB.sdata0"), 0, SHT_PROGBITS, SHF_ALLOC }, 1991 { NULL, 0, 0, 0, 0 } 1992 }; 1993 1994 /* This is what we want for new plt/got. */ 1995 static struct bfd_elf_special_section ppc_alt_plt = 1996 { STRING_COMMA_LEN (".plt"), 0, SHT_PROGBITS, SHF_ALLOC }; 1997 1998 static const struct bfd_elf_special_section * 1999 ppc_elf_get_sec_type_attr (bfd *abfd ATTRIBUTE_UNUSED, asection *sec) 2000 { 2001 const struct bfd_elf_special_section *ssect; 2002 2003 /* See if this is one of the special sections. */ 2004 if (sec->name == NULL) 2005 return NULL; 2006 2007 ssect = _bfd_elf_get_special_section (sec->name, ppc_elf_special_sections, 2008 sec->use_rela_p); 2009 if (ssect != NULL) 2010 { 2011 if (ssect == ppc_elf_special_sections && (sec->flags & SEC_LOAD) != 0) 2012 ssect = &ppc_alt_plt; 2013 return ssect; 2014 } 2015 2016 return _bfd_elf_get_sec_type_attr (abfd, sec); 2017 } 2018 2019 /* Very simple linked list structure for recording apuinfo values. */ 2020 typedef struct apuinfo_list 2021 { 2022 struct apuinfo_list *next; 2023 unsigned long value; 2024 } 2025 apuinfo_list; 2026 2027 static apuinfo_list *head; 2028 2029 2030 static void 2031 apuinfo_list_init (void) 2032 { 2033 head = NULL; 2034 } 2035 2036 static void 2037 apuinfo_list_add (unsigned long value) 2038 { 2039 apuinfo_list *entry = head; 2040 2041 while (entry != NULL) 2042 { 2043 if (entry->value == value) 2044 return; 2045 entry = entry->next; 2046 } 2047 2048 entry = bfd_malloc (sizeof (* entry)); 2049 if (entry == NULL) 2050 return; 2051 2052 entry->value = value; 2053 entry->next = head; 2054 head = entry; 2055 } 2056 2057 static unsigned 2058 apuinfo_list_length (void) 2059 { 2060 apuinfo_list *entry; 2061 unsigned long count; 2062 2063 for (entry = head, count = 0; 2064 entry; 2065 entry = entry->next) 2066 ++ count; 2067 2068 return count; 2069 } 2070 2071 static inline unsigned long 2072 apuinfo_list_element (unsigned long number) 2073 { 2074 apuinfo_list * entry; 2075 2076 for (entry = head; 2077 entry && number --; 2078 entry = entry->next) 2079 ; 2080 2081 return entry ? entry->value : 0; 2082 } 2083 2084 static void 2085 apuinfo_list_finish (void) 2086 { 2087 apuinfo_list *entry; 2088 2089 for (entry = head; entry;) 2090 { 2091 apuinfo_list *next = entry->next; 2092 free (entry); 2093 entry = next; 2094 } 2095 2096 head = NULL; 2097 } 2098 2099 #define APUINFO_SECTION_NAME ".PPC.EMB.apuinfo" 2100 #define APUINFO_LABEL "APUinfo" 2101 2102 /* Scan the input BFDs and create a linked list of 2103 the APUinfo values that will need to be emitted. */ 2104 2105 static void 2106 ppc_elf_begin_write_processing (bfd *abfd, struct bfd_link_info *link_info) 2107 { 2108 bfd *ibfd; 2109 asection *asec; 2110 char *buffer; 2111 unsigned num_input_sections; 2112 bfd_size_type output_section_size; 2113 unsigned i; 2114 unsigned num_entries; 2115 unsigned long offset; 2116 unsigned long length; 2117 const char *error_message = NULL; 2118 2119 if (link_info == NULL) 2120 return; 2121 2122 /* Scan the input bfds, looking for apuinfo sections. */ 2123 num_input_sections = 0; 2124 output_section_size = 0; 2125 2126 for (ibfd = link_info->input_bfds; ibfd; ibfd = ibfd->link_next) 2127 { 2128 asec = bfd_get_section_by_name (ibfd, APUINFO_SECTION_NAME); 2129 if (asec) 2130 { 2131 ++ num_input_sections; 2132 output_section_size += asec->size; 2133 } 2134 } 2135 2136 /* We need at least one input sections 2137 in order to make merging worthwhile. */ 2138 if (num_input_sections < 1) 2139 return; 2140 2141 /* Just make sure that the output section exists as well. */ 2142 asec = bfd_get_section_by_name (abfd, APUINFO_SECTION_NAME); 2143 if (asec == NULL) 2144 return; 2145 2146 /* Allocate a buffer for the contents of the input sections. */ 2147 buffer = bfd_malloc (output_section_size); 2148 if (buffer == NULL) 2149 return; 2150 2151 offset = 0; 2152 apuinfo_list_init (); 2153 2154 /* Read in the input sections contents. */ 2155 for (ibfd = link_info->input_bfds; ibfd; ibfd = ibfd->link_next) 2156 { 2157 unsigned long datum; 2158 char *ptr; 2159 2160 asec = bfd_get_section_by_name (ibfd, APUINFO_SECTION_NAME); 2161 if (asec == NULL) 2162 continue; 2163 2164 length = asec->size; 2165 if (length < 24) 2166 { 2167 error_message = _("corrupt or empty %s section in %B"); 2168 goto fail; 2169 } 2170 2171 if (bfd_seek (ibfd, asec->filepos, SEEK_SET) != 0 2172 || (bfd_bread (buffer + offset, length, ibfd) != length)) 2173 { 2174 error_message = _("unable to read in %s section from %B"); 2175 goto fail; 2176 } 2177 2178 /* Process the contents of the section. */ 2179 ptr = buffer + offset; 2180 error_message = _("corrupt %s section in %B"); 2181 2182 /* Verify the contents of the header. Note - we have to 2183 extract the values this way in order to allow for a 2184 host whose endian-ness is different from the target. */ 2185 datum = bfd_get_32 (ibfd, ptr); 2186 if (datum != sizeof APUINFO_LABEL) 2187 goto fail; 2188 2189 datum = bfd_get_32 (ibfd, ptr + 8); 2190 if (datum != 0x2) 2191 goto fail; 2192 2193 if (strcmp (ptr + 12, APUINFO_LABEL) != 0) 2194 goto fail; 2195 2196 /* Get the number of bytes used for apuinfo entries. */ 2197 datum = bfd_get_32 (ibfd, ptr + 4); 2198 if (datum + 20 != length) 2199 goto fail; 2200 2201 /* Make sure that we do not run off the end of the section. */ 2202 if (offset + length > output_section_size) 2203 goto fail; 2204 2205 /* Scan the apuinfo section, building a list of apuinfo numbers. */ 2206 for (i = 0; i < datum; i += 4) 2207 apuinfo_list_add (bfd_get_32 (ibfd, ptr + 20 + i)); 2208 2209 /* Update the offset. */ 2210 offset += length; 2211 } 2212 2213 error_message = NULL; 2214 2215 /* Compute the size of the output section. */ 2216 num_entries = apuinfo_list_length (); 2217 output_section_size = 20 + num_entries * 4; 2218 2219 asec = bfd_get_section_by_name (abfd, APUINFO_SECTION_NAME); 2220 2221 if (! bfd_set_section_size (abfd, asec, output_section_size)) 2222 ibfd = abfd, 2223 error_message = _("warning: unable to set size of %s section in %B"); 2224 2225 fail: 2226 free (buffer); 2227 2228 if (error_message) 2229 (*_bfd_error_handler) (error_message, ibfd, APUINFO_SECTION_NAME); 2230 } 2231 2232 /* Prevent the output section from accumulating the input sections' 2233 contents. We have already stored this in our linked list structure. */ 2234 2235 static bfd_boolean 2236 ppc_elf_write_section (bfd *abfd ATTRIBUTE_UNUSED, 2237 struct bfd_link_info *link_info ATTRIBUTE_UNUSED, 2238 asection *asec, 2239 bfd_byte *contents ATTRIBUTE_UNUSED) 2240 { 2241 return (apuinfo_list_length () 2242 && strcmp (asec->name, APUINFO_SECTION_NAME) == 0); 2243 } 2244 2245 /* Finally we can generate the output section. */ 2246 2247 static void 2248 ppc_elf_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED) 2249 { 2250 bfd_byte *buffer; 2251 asection *asec; 2252 unsigned i; 2253 unsigned num_entries; 2254 bfd_size_type length; 2255 2256 asec = bfd_get_section_by_name (abfd, APUINFO_SECTION_NAME); 2257 if (asec == NULL) 2258 return; 2259 2260 if (apuinfo_list_length () == 0) 2261 return; 2262 2263 length = asec->size; 2264 if (length < 20) 2265 return; 2266 2267 buffer = bfd_malloc (length); 2268 if (buffer == NULL) 2269 { 2270 (*_bfd_error_handler) 2271 (_("failed to allocate space for new APUinfo section.")); 2272 return; 2273 } 2274 2275 /* Create the apuinfo header. */ 2276 num_entries = apuinfo_list_length (); 2277 bfd_put_32 (abfd, sizeof APUINFO_LABEL, buffer); 2278 bfd_put_32 (abfd, num_entries * 4, buffer + 4); 2279 bfd_put_32 (abfd, 0x2, buffer + 8); 2280 strcpy ((char *) buffer + 12, APUINFO_LABEL); 2281 2282 length = 20; 2283 for (i = 0; i < num_entries; i++) 2284 { 2285 bfd_put_32 (abfd, apuinfo_list_element (i), buffer + length); 2286 length += 4; 2287 } 2288 2289 if (length != asec->size) 2290 (*_bfd_error_handler) (_("failed to compute new APUinfo section.")); 2291 2292 if (! bfd_set_section_contents (abfd, asec, buffer, (file_ptr) 0, length)) 2293 (*_bfd_error_handler) (_("failed to install new APUinfo section.")); 2294 2295 free (buffer); 2296 2297 apuinfo_list_finish (); 2298 } 2299 2300 static bfd_boolean 2301 is_pic_glink_stub (bfd *abfd, asection *glink, bfd_vma off) 2302 { 2303 bfd_byte buf[16]; 2304 unsigned int insn; 2305 2306 if (!bfd_get_section_contents (abfd, glink, buf, off, 16)) 2307 return FALSE; 2308 2309 insn = bfd_get_32 (abfd, buf); 2310 if ((insn & 0xffff0000) == LWZ_11_30 2311 && bfd_get_32 (abfd, buf + 4) == MTCTR_11 2312 && bfd_get_32 (abfd, buf + 8) == BCTR) 2313 return TRUE; 2314 2315 if ((insn & 0xffff0000) == ADDIS_11_30 2316 && (bfd_get_32 (abfd, buf + 4) & 0xffff0000) == LWZ_11_11 2317 && bfd_get_32 (abfd, buf + 8) == MTCTR_11 2318 && bfd_get_32 (abfd, buf + 12) == BCTR) 2319 return TRUE; 2320 return FALSE; 2321 } 2322 2323 static bfd_boolean 2324 section_covers_vma (bfd *abfd ATTRIBUTE_UNUSED, asection *section, void *ptr) 2325 { 2326 bfd_vma vma = *(bfd_vma *) ptr; 2327 return ((section->flags & SEC_ALLOC) != 0 2328 && section->vma <= vma 2329 && vma < section->vma + section->size); 2330 } 2331 2332 static long 2333 ppc_elf_get_synthetic_symtab (bfd *abfd, long symcount, asymbol **syms, 2334 long dynsymcount, asymbol **dynsyms, 2335 asymbol **ret) 2336 { 2337 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); 2338 asection *plt, *relplt, *dynamic, *glink; 2339 bfd_vma glink_vma = 0; 2340 bfd_vma resolv_vma = 0; 2341 bfd_vma stub_vma; 2342 asymbol *s; 2343 arelent *p; 2344 long count, i; 2345 size_t size; 2346 char *names; 2347 bfd_byte buf[4]; 2348 2349 *ret = NULL; 2350 2351 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) 2352 return 0; 2353 2354 if (dynsymcount <= 0) 2355 return 0; 2356 2357 relplt = bfd_get_section_by_name (abfd, ".rela.plt"); 2358 if (relplt == NULL) 2359 return 0; 2360 2361 plt = bfd_get_section_by_name (abfd, ".plt"); 2362 if (plt == NULL) 2363 return 0; 2364 2365 /* Call common code to handle old-style executable PLTs. */ 2366 if (elf_section_flags (plt) & SHF_EXECINSTR) 2367 return _bfd_elf_get_synthetic_symtab (abfd, symcount, syms, 2368 dynsymcount, dynsyms, ret); 2369 2370 /* If this object was prelinked, the prelinker stored the address 2371 of .glink at got[1]. If it wasn't prelinked, got[1] will be zero. */ 2372 dynamic = bfd_get_section_by_name (abfd, ".dynamic"); 2373 if (dynamic != NULL) 2374 { 2375 bfd_byte *dynbuf, *extdyn, *extdynend; 2376 size_t extdynsize; 2377 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *); 2378 2379 if (!bfd_malloc_and_get_section (abfd, dynamic, &dynbuf)) 2380 return -1; 2381 2382 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn; 2383 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in; 2384 2385 extdyn = dynbuf; 2386 extdynend = extdyn + dynamic->size; 2387 for (; extdyn < extdynend; extdyn += extdynsize) 2388 { 2389 Elf_Internal_Dyn dyn; 2390 (*swap_dyn_in) (abfd, extdyn, &dyn); 2391 2392 if (dyn.d_tag == DT_NULL) 2393 break; 2394 2395 if (dyn.d_tag == DT_PPC_GOT) 2396 { 2397 unsigned int g_o_t = dyn.d_un.d_val; 2398 asection *got = bfd_get_section_by_name (abfd, ".got"); 2399 if (got != NULL 2400 && bfd_get_section_contents (abfd, got, buf, 2401 g_o_t - got->vma + 4, 4)) 2402 glink_vma = bfd_get_32 (abfd, buf); 2403 break; 2404 } 2405 } 2406 free (dynbuf); 2407 } 2408 2409 /* Otherwise we read the first plt entry. */ 2410 if (glink_vma == 0) 2411 { 2412 if (bfd_get_section_contents (abfd, plt, buf, 0, 4)) 2413 glink_vma = bfd_get_32 (abfd, buf); 2414 } 2415 2416 if (glink_vma == 0) 2417 return 0; 2418 2419 /* The .glink section usually does not survive the final 2420 link; search for the section (usually .text) where the 2421 glink stubs now reside. */ 2422 glink = bfd_sections_find_if (abfd, section_covers_vma, &glink_vma); 2423 if (glink == NULL) 2424 return 0; 2425 2426 /* Determine glink PLT resolver by reading the relative branch 2427 from the first glink stub. */ 2428 if (bfd_get_section_contents (abfd, glink, buf, 2429 glink_vma - glink->vma, 4)) 2430 { 2431 unsigned int insn = bfd_get_32 (abfd, buf); 2432 2433 /* The first glink stub may either branch to the resolver ... */ 2434 insn ^= B; 2435 if ((insn & ~0x3fffffc) == 0) 2436 resolv_vma = glink_vma + (insn ^ 0x2000000) - 0x2000000; 2437 2438 /* ... or fall through a bunch of NOPs. */ 2439 else if ((insn ^ B ^ NOP) == 0) 2440 for (i = 4; 2441 bfd_get_section_contents (abfd, glink, buf, 2442 glink_vma - glink->vma + i, 4); 2443 i += 4) 2444 if (bfd_get_32 (abfd, buf) != NOP) 2445 { 2446 resolv_vma = glink_vma + i; 2447 break; 2448 } 2449 } 2450 2451 count = relplt->size / sizeof (Elf32_External_Rela); 2452 stub_vma = glink_vma - (bfd_vma) count * 16; 2453 /* If the stubs are those for -shared/-pie then we might have 2454 multiple stubs for each plt entry. If that is the case then 2455 there is no way to associate stubs with their plt entries short 2456 of figuring out the GOT pointer value used in the stub. */ 2457 if (!bfd_get_section_contents (abfd, glink, buf, 2458 stub_vma - glink->vma, 4) 2459 || ((bfd_get_32 (abfd, buf) & 0xffff0000) != LIS_11 2460 && is_pic_glink_stub (abfd, glink, stub_vma - glink->vma - 16))) 2461 return 0; 2462 2463 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; 2464 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE)) 2465 return -1; 2466 2467 size = count * sizeof (asymbol); 2468 p = relplt->relocation; 2469 for (i = 0; i < count; i++, p++) 2470 size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt"); 2471 2472 size += sizeof (asymbol) + sizeof ("__glink"); 2473 2474 if (resolv_vma) 2475 size += sizeof (asymbol) + sizeof ("__glink_PLTresolve"); 2476 2477 s = *ret = bfd_malloc (size); 2478 if (s == NULL) 2479 return -1; 2480 2481 names = (char *) (s + count + 1 + (resolv_vma != 0)); 2482 p = relplt->relocation; 2483 for (i = 0; i < count; i++, p++) 2484 { 2485 size_t len; 2486 2487 *s = **p->sym_ptr_ptr; 2488 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since 2489 we are defining a symbol, ensure one of them is set. */ 2490 if ((s->flags & BSF_LOCAL) == 0) 2491 s->flags |= BSF_GLOBAL; 2492 s->flags |= BSF_SYNTHETIC; 2493 s->section = glink; 2494 s->value = stub_vma - glink->vma; 2495 s->name = names; 2496 s->udata.p = NULL; 2497 len = strlen ((*p->sym_ptr_ptr)->name); 2498 memcpy (names, (*p->sym_ptr_ptr)->name, len); 2499 names += len; 2500 memcpy (names, "@plt", sizeof ("@plt")); 2501 names += sizeof ("@plt"); 2502 ++s; 2503 stub_vma += 16; 2504 } 2505 2506 /* Add a symbol at the start of the glink branch table. */ 2507 memset (s, 0, sizeof *s); 2508 s->the_bfd = abfd; 2509 s->flags = BSF_GLOBAL | BSF_SYNTHETIC; 2510 s->section = glink; 2511 s->value = glink_vma - glink->vma; 2512 s->name = names; 2513 memcpy (names, "__glink", sizeof ("__glink")); 2514 names += sizeof ("__glink"); 2515 s++; 2516 count++; 2517 2518 if (resolv_vma) 2519 { 2520 /* Add a symbol for the glink PLT resolver. */ 2521 memset (s, 0, sizeof *s); 2522 s->the_bfd = abfd; 2523 s->flags = BSF_GLOBAL | BSF_SYNTHETIC; 2524 s->section = glink; 2525 s->value = resolv_vma - glink->vma; 2526 s->name = names; 2527 memcpy (names, "__glink_PLTresolve", sizeof ("__glink_PLTresolve")); 2528 names += sizeof ("__glink_PLTresolve"); 2529 s++; 2530 count++; 2531 } 2532 2533 return count; 2534 } 2535 2536 /* The following functions are specific to the ELF linker, while 2537 functions above are used generally. They appear in this file more 2538 or less in the order in which they are called. eg. 2539 ppc_elf_check_relocs is called early in the link process, 2540 ppc_elf_finish_dynamic_sections is one of the last functions 2541 called. */ 2542 2543 /* The PPC linker needs to keep track of the number of relocs that it 2544 decides to copy as dynamic relocs in check_relocs for each symbol. 2545 This is so that it can later discard them if they are found to be 2546 unnecessary. We store the information in a field extending the 2547 regular ELF linker hash table. */ 2548 2549 struct ppc_elf_dyn_relocs 2550 { 2551 struct ppc_elf_dyn_relocs *next; 2552 2553 /* The input section of the reloc. */ 2554 asection *sec; 2555 2556 /* Total number of relocs copied for the input section. */ 2557 bfd_size_type count; 2558 2559 /* Number of pc-relative relocs copied for the input section. */ 2560 bfd_size_type pc_count; 2561 }; 2562 2563 /* Track PLT entries needed for a given symbol. We might need more 2564 than one glink entry per symbol. */ 2565 struct plt_entry 2566 { 2567 struct plt_entry *next; 2568 2569 /* -fPIC uses multiple GOT sections, one per file, called ".got2". 2570 This field stores the offset into .got2 used to initialise the 2571 GOT pointer reg. It will always be at least 32768 (and for 2572 current gcc this is the only offset used). */ 2573 bfd_vma addend; 2574 2575 /* The .got2 section. */ 2576 asection *sec; 2577 2578 /* PLT refcount or offset. */ 2579 union 2580 { 2581 bfd_signed_vma refcount; 2582 bfd_vma offset; 2583 } plt; 2584 2585 /* .glink stub offset. */ 2586 bfd_vma glink_offset; 2587 }; 2588 2589 /* Of those relocs that might be copied as dynamic relocs, this function 2590 selects those that must be copied when linking a shared library, 2591 even when the symbol is local. */ 2592 2593 static int 2594 must_be_dyn_reloc (struct bfd_link_info *info, 2595 enum elf_ppc_reloc_type r_type) 2596 { 2597 switch (r_type) 2598 { 2599 default: 2600 return 1; 2601 2602 case R_PPC_REL24: 2603 case R_PPC_REL14: 2604 case R_PPC_REL14_BRTAKEN: 2605 case R_PPC_REL14_BRNTAKEN: 2606 case R_PPC_REL32: 2607 return 0; 2608 2609 case R_PPC_TPREL32: 2610 case R_PPC_TPREL16: 2611 case R_PPC_TPREL16_LO: 2612 case R_PPC_TPREL16_HI: 2613 case R_PPC_TPREL16_HA: 2614 return !info->executable; 2615 } 2616 } 2617 2618 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 2619 copying dynamic variables from a shared lib into an app's dynbss 2620 section, and instead use a dynamic relocation to point into the 2621 shared lib. */ 2622 #define ELIMINATE_COPY_RELOCS 1 2623 2624 /* PPC ELF linker hash entry. */ 2625 2626 struct ppc_elf_link_hash_entry 2627 { 2628 struct elf_link_hash_entry elf; 2629 2630 /* If this symbol is used in the linker created sections, the processor 2631 specific backend uses this field to map the field into the offset 2632 from the beginning of the section. */ 2633 elf_linker_section_pointers_t *linker_section_pointer; 2634 2635 /* Track dynamic relocs copied for this symbol. */ 2636 struct ppc_elf_dyn_relocs *dyn_relocs; 2637 2638 /* Contexts in which symbol is used in the GOT (or TOC). 2639 TLS_GD .. TLS_TLS bits are or'd into the mask as the 2640 corresponding relocs are encountered during check_relocs. 2641 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to 2642 indicate the corresponding GOT entry type is not needed. */ 2643 #define TLS_GD 1 /* GD reloc. */ 2644 #define TLS_LD 2 /* LD reloc. */ 2645 #define TLS_TPREL 4 /* TPREL reloc, => IE. */ 2646 #define TLS_DTPREL 8 /* DTPREL reloc, => LD. */ 2647 #define TLS_TLS 16 /* Any TLS reloc. */ 2648 #define TLS_TPRELGD 32 /* TPREL reloc resulting from GD->IE. */ 2649 char tls_mask; 2650 2651 /* Nonzero if we have seen a small data relocation referring to this 2652 symbol. */ 2653 unsigned char has_sda_refs; 2654 }; 2655 2656 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent)) 2657 2658 /* PPC ELF linker hash table. */ 2659 2660 struct ppc_elf_link_hash_table 2661 { 2662 struct elf_link_hash_table elf; 2663 2664 /* Short-cuts to get to dynamic linker sections. */ 2665 asection *got; 2666 asection *relgot; 2667 asection *glink; 2668 asection *plt; 2669 asection *relplt; 2670 asection *dynbss; 2671 asection *relbss; 2672 asection *dynsbss; 2673 asection *relsbss; 2674 elf_linker_section_t sdata[2]; 2675 asection *sbss; 2676 2677 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */ 2678 asection *srelplt2; 2679 2680 /* The .got.plt section (VxWorks only)*/ 2681 asection *sgotplt; 2682 2683 /* Shortcut to __tls_get_addr. */ 2684 struct elf_link_hash_entry *tls_get_addr; 2685 2686 /* The bfd that forced an old-style PLT. */ 2687 bfd *old_bfd; 2688 2689 /* TLS local dynamic got entry handling. */ 2690 union { 2691 bfd_signed_vma refcount; 2692 bfd_vma offset; 2693 } tlsld_got; 2694 2695 /* Offset of PltResolve function in glink. */ 2696 bfd_vma glink_pltresolve; 2697 2698 /* Size of reserved GOT entries. */ 2699 unsigned int got_header_size; 2700 /* Non-zero if allocating the header left a gap. */ 2701 unsigned int got_gap; 2702 2703 /* The type of PLT we have chosen to use. */ 2704 enum ppc_elf_plt_type plt_type; 2705 2706 /* Set if we should emit symbols for stubs. */ 2707 unsigned int emit_stub_syms:1; 2708 2709 /* True if the target system is VxWorks. */ 2710 unsigned int is_vxworks:1; 2711 2712 /* The size of PLT entries. */ 2713 int plt_entry_size; 2714 /* The distance between adjacent PLT slots. */ 2715 int plt_slot_size; 2716 /* The size of the first PLT entry. */ 2717 int plt_initial_entry_size; 2718 2719 /* Small local sym to section mapping cache. */ 2720 struct sym_sec_cache sym_sec; 2721 }; 2722 2723 /* Get the PPC ELF linker hash table from a link_info structure. */ 2724 2725 #define ppc_elf_hash_table(p) \ 2726 ((struct ppc_elf_link_hash_table *) (p)->hash) 2727 2728 /* Create an entry in a PPC ELF linker hash table. */ 2729 2730 static struct bfd_hash_entry * 2731 ppc_elf_link_hash_newfunc (struct bfd_hash_entry *entry, 2732 struct bfd_hash_table *table, 2733 const char *string) 2734 { 2735 /* Allocate the structure if it has not already been allocated by a 2736 subclass. */ 2737 if (entry == NULL) 2738 { 2739 entry = bfd_hash_allocate (table, 2740 sizeof (struct ppc_elf_link_hash_entry)); 2741 if (entry == NULL) 2742 return entry; 2743 } 2744 2745 /* Call the allocation method of the superclass. */ 2746 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 2747 if (entry != NULL) 2748 { 2749 ppc_elf_hash_entry (entry)->linker_section_pointer = NULL; 2750 ppc_elf_hash_entry (entry)->dyn_relocs = NULL; 2751 ppc_elf_hash_entry (entry)->tls_mask = 0; 2752 } 2753 2754 return entry; 2755 } 2756 2757 /* Create a PPC ELF linker hash table. */ 2758 2759 static struct bfd_link_hash_table * 2760 ppc_elf_link_hash_table_create (bfd *abfd) 2761 { 2762 struct ppc_elf_link_hash_table *ret; 2763 2764 ret = bfd_zmalloc (sizeof (struct ppc_elf_link_hash_table)); 2765 if (ret == NULL) 2766 return NULL; 2767 2768 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, 2769 ppc_elf_link_hash_newfunc, 2770 sizeof (struct ppc_elf_link_hash_entry))) 2771 { 2772 free (ret); 2773 return NULL; 2774 } 2775 2776 ret->elf.init_plt_refcount.refcount = 0; 2777 ret->elf.init_plt_refcount.glist = NULL; 2778 ret->elf.init_plt_offset.offset = 0; 2779 ret->elf.init_plt_offset.glist = NULL; 2780 2781 ret->sdata[0].name = ".sdata"; 2782 ret->sdata[0].sym_name = "_SDA_BASE_"; 2783 ret->sdata[0].bss_name = ".sbss"; 2784 2785 ret->sdata[1].name = ".sdata2"; 2786 ret->sdata[1].sym_name = "_SDA2_BASE_"; 2787 ret->sdata[1].bss_name = ".sbss2"; 2788 2789 ret->plt_entry_size = 12; 2790 ret->plt_slot_size = 8; 2791 ret->plt_initial_entry_size = 72; 2792 2793 return &ret->elf.root; 2794 } 2795 2796 /* Create .got and the related sections. */ 2797 2798 static bfd_boolean 2799 ppc_elf_create_got (bfd *abfd, struct bfd_link_info *info) 2800 { 2801 struct ppc_elf_link_hash_table *htab; 2802 asection *s; 2803 flagword flags; 2804 2805 if (!_bfd_elf_create_got_section (abfd, info)) 2806 return FALSE; 2807 2808 htab = ppc_elf_hash_table (info); 2809 htab->got = s = bfd_get_section_by_name (abfd, ".got"); 2810 if (s == NULL) 2811 abort (); 2812 2813 if (htab->is_vxworks) 2814 { 2815 htab->sgotplt = bfd_get_section_by_name (abfd, ".got.plt"); 2816 if (!htab->sgotplt) 2817 abort (); 2818 } 2819 else 2820 { 2821 /* The powerpc .got has a blrl instruction in it. Mark it 2822 executable. */ 2823 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS 2824 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 2825 if (!bfd_set_section_flags (abfd, s, flags)) 2826 return FALSE; 2827 } 2828 2829 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2830 | SEC_LINKER_CREATED | SEC_READONLY); 2831 htab->relgot = bfd_make_section_with_flags (abfd, ".rela.got", flags); 2832 if (!htab->relgot 2833 || ! bfd_set_section_alignment (abfd, htab->relgot, 2)) 2834 return FALSE; 2835 2836 return TRUE; 2837 } 2838 2839 /* We have to create .dynsbss and .rela.sbss here so that they get mapped 2840 to output sections (just like _bfd_elf_create_dynamic_sections has 2841 to create .dynbss and .rela.bss). */ 2842 2843 static bfd_boolean 2844 ppc_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2845 { 2846 struct ppc_elf_link_hash_table *htab; 2847 asection *s; 2848 flagword flags; 2849 2850 htab = ppc_elf_hash_table (info); 2851 2852 if (htab->got == NULL 2853 && !ppc_elf_create_got (abfd, info)) 2854 return FALSE; 2855 2856 if (!_bfd_elf_create_dynamic_sections (abfd, info)) 2857 return FALSE; 2858 2859 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_HAS_CONTENTS 2860 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 2861 2862 s = bfd_make_section_anyway_with_flags (abfd, ".glink", flags | SEC_CODE); 2863 htab->glink = s; 2864 if (s == NULL 2865 || !bfd_set_section_alignment (abfd, s, 4)) 2866 return FALSE; 2867 2868 htab->dynbss = bfd_get_section_by_name (abfd, ".dynbss"); 2869 s = bfd_make_section_with_flags (abfd, ".dynsbss", 2870 SEC_ALLOC | SEC_LINKER_CREATED); 2871 htab->dynsbss = s; 2872 if (s == NULL) 2873 return FALSE; 2874 2875 if (! info->shared) 2876 { 2877 htab->relbss = bfd_get_section_by_name (abfd, ".rela.bss"); 2878 s = bfd_make_section_with_flags (abfd, ".rela.sbss", flags); 2879 htab->relsbss = s; 2880 if (s == NULL 2881 || ! bfd_set_section_alignment (abfd, s, 2)) 2882 return FALSE; 2883 } 2884 2885 if (htab->is_vxworks 2886 && !elf_vxworks_create_dynamic_sections (abfd, info, &htab->srelplt2)) 2887 return FALSE; 2888 2889 htab->relplt = bfd_get_section_by_name (abfd, ".rela.plt"); 2890 htab->plt = s = bfd_get_section_by_name (abfd, ".plt"); 2891 if (s == NULL) 2892 abort (); 2893 2894 flags = SEC_ALLOC | SEC_CODE | SEC_LINKER_CREATED; 2895 if (htab->plt_type == PLT_VXWORKS) 2896 /* The VxWorks PLT is a loaded section with contents. */ 2897 flags |= SEC_HAS_CONTENTS | SEC_LOAD | SEC_READONLY; 2898 return bfd_set_section_flags (abfd, s, flags); 2899 } 2900 2901 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 2902 2903 static void 2904 ppc_elf_copy_indirect_symbol (struct bfd_link_info *info, 2905 struct elf_link_hash_entry *dir, 2906 struct elf_link_hash_entry *ind) 2907 { 2908 struct ppc_elf_link_hash_entry *edir, *eind; 2909 2910 edir = (struct ppc_elf_link_hash_entry *) dir; 2911 eind = (struct ppc_elf_link_hash_entry *) ind; 2912 2913 if (eind->dyn_relocs != NULL) 2914 { 2915 if (edir->dyn_relocs != NULL) 2916 { 2917 struct ppc_elf_dyn_relocs **pp; 2918 struct ppc_elf_dyn_relocs *p; 2919 2920 /* Add reloc counts against the indirect sym to the direct sym 2921 list. Merge any entries against the same section. */ 2922 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 2923 { 2924 struct ppc_elf_dyn_relocs *q; 2925 2926 for (q = edir->dyn_relocs; q != NULL; q = q->next) 2927 if (q->sec == p->sec) 2928 { 2929 q->pc_count += p->pc_count; 2930 q->count += p->count; 2931 *pp = p->next; 2932 break; 2933 } 2934 if (q == NULL) 2935 pp = &p->next; 2936 } 2937 *pp = edir->dyn_relocs; 2938 } 2939 2940 edir->dyn_relocs = eind->dyn_relocs; 2941 eind->dyn_relocs = NULL; 2942 } 2943 2944 edir->tls_mask |= eind->tls_mask; 2945 edir->has_sda_refs |= eind->has_sda_refs; 2946 2947 /* If called to transfer flags for a weakdef during processing 2948 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 2949 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 2950 if (!(ELIMINATE_COPY_RELOCS 2951 && eind->elf.root.type != bfd_link_hash_indirect 2952 && edir->elf.dynamic_adjusted)) 2953 edir->elf.non_got_ref |= eind->elf.non_got_ref; 2954 2955 edir->elf.ref_dynamic |= eind->elf.ref_dynamic; 2956 edir->elf.ref_regular |= eind->elf.ref_regular; 2957 edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak; 2958 edir->elf.needs_plt |= eind->elf.needs_plt; 2959 edir->elf.pointer_equality_needed |= eind->elf.pointer_equality_needed; 2960 2961 /* If we were called to copy over info for a weak sym, that's all. */ 2962 if (eind->elf.root.type != bfd_link_hash_indirect) 2963 return; 2964 2965 /* Copy over the GOT refcount entries that we may have already seen to 2966 the symbol which just became indirect. */ 2967 edir->elf.got.refcount += eind->elf.got.refcount; 2968 eind->elf.got.refcount = 0; 2969 2970 /* And plt entries. */ 2971 if (eind->elf.plt.plist != NULL) 2972 { 2973 if (edir->elf.plt.plist != NULL) 2974 { 2975 struct plt_entry **entp; 2976 struct plt_entry *ent; 2977 2978 for (entp = &eind->elf.plt.plist; (ent = *entp) != NULL; ) 2979 { 2980 struct plt_entry *dent; 2981 2982 for (dent = edir->elf.plt.plist; dent != NULL; dent = dent->next) 2983 if (dent->sec == ent->sec && dent->addend == ent->addend) 2984 { 2985 dent->plt.refcount += ent->plt.refcount; 2986 *entp = ent->next; 2987 break; 2988 } 2989 if (dent == NULL) 2990 entp = &ent->next; 2991 } 2992 *entp = edir->elf.plt.plist; 2993 } 2994 2995 edir->elf.plt.plist = eind->elf.plt.plist; 2996 eind->elf.plt.plist = NULL; 2997 } 2998 2999 if (eind->elf.dynindx != -1) 3000 { 3001 if (edir->elf.dynindx != -1) 3002 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 3003 edir->elf.dynstr_index); 3004 edir->elf.dynindx = eind->elf.dynindx; 3005 edir->elf.dynstr_index = eind->elf.dynstr_index; 3006 eind->elf.dynindx = -1; 3007 eind->elf.dynstr_index = 0; 3008 } 3009 } 3010 3011 /* Hook called by the linker routine which adds symbols from an object 3012 file. We use it to put .comm items in .sbss, and not .bss. */ 3013 3014 static bfd_boolean 3015 ppc_elf_add_symbol_hook (bfd *abfd, 3016 struct bfd_link_info *info, 3017 Elf_Internal_Sym *sym, 3018 const char **namep ATTRIBUTE_UNUSED, 3019 flagword *flagsp ATTRIBUTE_UNUSED, 3020 asection **secp, 3021 bfd_vma *valp) 3022 { 3023 if (sym->st_shndx == SHN_COMMON 3024 && !info->relocatable 3025 && is_ppc_elf (info->output_bfd) 3026 && sym->st_size <= elf_gp_size (abfd)) 3027 { 3028 /* Common symbols less than or equal to -G nn bytes are automatically 3029 put into .sbss. */ 3030 struct ppc_elf_link_hash_table *htab; 3031 3032 htab = ppc_elf_hash_table (info); 3033 if (htab->sbss == NULL) 3034 { 3035 flagword flags = SEC_IS_COMMON | SEC_LINKER_CREATED; 3036 3037 if (!htab->elf.dynobj) 3038 htab->elf.dynobj = abfd; 3039 3040 htab->sbss = bfd_make_section_anyway_with_flags (htab->elf.dynobj, 3041 ".sbss", 3042 flags); 3043 if (htab->sbss == NULL) 3044 return FALSE; 3045 } 3046 3047 *secp = htab->sbss; 3048 *valp = sym->st_size; 3049 } 3050 3051 return TRUE; 3052 } 3053 3054 static bfd_boolean 3055 create_sdata_sym (struct ppc_elf_link_hash_table *htab, 3056 elf_linker_section_t *lsect) 3057 { 3058 lsect->sym = elf_link_hash_lookup (&htab->elf, lsect->sym_name, 3059 TRUE, FALSE, TRUE); 3060 if (lsect->sym == NULL) 3061 return FALSE; 3062 if (lsect->sym->root.type == bfd_link_hash_new) 3063 lsect->sym->non_elf = 0; 3064 lsect->sym->ref_regular = 1; 3065 return TRUE; 3066 } 3067 3068 /* Create a special linker section. */ 3069 3070 static bfd_boolean 3071 ppc_elf_create_linker_section (bfd *abfd, 3072 struct bfd_link_info *info, 3073 flagword flags, 3074 elf_linker_section_t *lsect) 3075 { 3076 struct ppc_elf_link_hash_table *htab = ppc_elf_hash_table (info); 3077 asection *s; 3078 3079 flags |= (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3080 | SEC_LINKER_CREATED); 3081 3082 /* Record the first bfd that needs the special sections. */ 3083 if (!htab->elf.dynobj) 3084 htab->elf.dynobj = abfd; 3085 3086 s = bfd_make_section_anyway_with_flags (htab->elf.dynobj, 3087 lsect->name, 3088 flags); 3089 if (s == NULL 3090 || !bfd_set_section_alignment (htab->elf.dynobj, s, 2)) 3091 return FALSE; 3092 lsect->section = s; 3093 3094 return create_sdata_sym (htab, lsect); 3095 } 3096 3097 /* Find a linker generated pointer with a given addend and type. */ 3098 3099 static elf_linker_section_pointers_t * 3100 elf_find_pointer_linker_section 3101 (elf_linker_section_pointers_t *linker_pointers, 3102 bfd_vma addend, 3103 elf_linker_section_t *lsect) 3104 { 3105 for ( ; linker_pointers != NULL; linker_pointers = linker_pointers->next) 3106 if (lsect == linker_pointers->lsect && addend == linker_pointers->addend) 3107 return linker_pointers; 3108 3109 return NULL; 3110 } 3111 3112 /* Allocate a pointer to live in a linker created section. */ 3113 3114 static bfd_boolean 3115 elf_create_pointer_linker_section (bfd *abfd, 3116 elf_linker_section_t *lsect, 3117 struct elf_link_hash_entry *h, 3118 const Elf_Internal_Rela *rel) 3119 { 3120 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL; 3121 elf_linker_section_pointers_t *linker_section_ptr; 3122 unsigned long r_symndx = ELF32_R_SYM (rel->r_info); 3123 bfd_size_type amt; 3124 3125 BFD_ASSERT (lsect != NULL); 3126 3127 /* Is this a global symbol? */ 3128 if (h != NULL) 3129 { 3130 struct ppc_elf_link_hash_entry *eh; 3131 3132 /* Has this symbol already been allocated? If so, our work is done. */ 3133 eh = (struct ppc_elf_link_hash_entry *) h; 3134 if (elf_find_pointer_linker_section (eh->linker_section_pointer, 3135 rel->r_addend, 3136 lsect)) 3137 return TRUE; 3138 3139 ptr_linker_section_ptr = &eh->linker_section_pointer; 3140 } 3141 else 3142 { 3143 BFD_ASSERT (is_ppc_elf (abfd)); 3144 3145 /* Allocation of a pointer to a local symbol. */ 3146 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd); 3147 3148 /* Allocate a table to hold the local symbols if first time. */ 3149 if (!ptr) 3150 { 3151 unsigned int num_symbols = elf_symtab_hdr (abfd).sh_info; 3152 3153 amt = num_symbols; 3154 amt *= sizeof (elf_linker_section_pointers_t *); 3155 ptr = bfd_zalloc (abfd, amt); 3156 3157 if (!ptr) 3158 return FALSE; 3159 3160 elf_local_ptr_offsets (abfd) = ptr; 3161 } 3162 3163 /* Has this symbol already been allocated? If so, our work is done. */ 3164 if (elf_find_pointer_linker_section (ptr[r_symndx], 3165 rel->r_addend, 3166 lsect)) 3167 return TRUE; 3168 3169 ptr_linker_section_ptr = &ptr[r_symndx]; 3170 } 3171 3172 /* Allocate space for a pointer in the linker section, and allocate 3173 a new pointer record from internal memory. */ 3174 BFD_ASSERT (ptr_linker_section_ptr != NULL); 3175 amt = sizeof (elf_linker_section_pointers_t); 3176 linker_section_ptr = bfd_alloc (abfd, amt); 3177 3178 if (!linker_section_ptr) 3179 return FALSE; 3180 3181 linker_section_ptr->next = *ptr_linker_section_ptr; 3182 linker_section_ptr->addend = rel->r_addend; 3183 linker_section_ptr->lsect = lsect; 3184 *ptr_linker_section_ptr = linker_section_ptr; 3185 3186 linker_section_ptr->offset = lsect->section->size; 3187 lsect->section->size += 4; 3188 3189 #ifdef DEBUG 3190 fprintf (stderr, 3191 "Create pointer in linker section %s, offset = %ld, section size = %ld\n", 3192 lsect->name, (long) linker_section_ptr->offset, 3193 (long) lsect->section->size); 3194 #endif 3195 3196 return TRUE; 3197 } 3198 3199 static bfd_boolean 3200 update_local_sym_info (bfd *abfd, 3201 Elf_Internal_Shdr *symtab_hdr, 3202 unsigned long r_symndx, 3203 int tls_type) 3204 { 3205 bfd_signed_vma *local_got_refcounts = elf_local_got_refcounts (abfd); 3206 char *local_got_tls_masks; 3207 3208 if (local_got_refcounts == NULL) 3209 { 3210 bfd_size_type size = symtab_hdr->sh_info; 3211 3212 size *= sizeof (*local_got_refcounts) + sizeof (*local_got_tls_masks); 3213 local_got_refcounts = bfd_zalloc (abfd, size); 3214 if (local_got_refcounts == NULL) 3215 return FALSE; 3216 elf_local_got_refcounts (abfd) = local_got_refcounts; 3217 } 3218 3219 local_got_refcounts[r_symndx] += 1; 3220 local_got_tls_masks = (char *) (local_got_refcounts + symtab_hdr->sh_info); 3221 local_got_tls_masks[r_symndx] |= tls_type; 3222 return TRUE; 3223 } 3224 3225 static bfd_boolean 3226 update_plt_info (bfd *abfd, struct elf_link_hash_entry *h, 3227 asection *sec, bfd_vma addend) 3228 { 3229 struct plt_entry *ent; 3230 3231 if (addend < 32768) 3232 sec = NULL; 3233 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 3234 if (ent->sec == sec && ent->addend == addend) 3235 break; 3236 if (ent == NULL) 3237 { 3238 bfd_size_type amt = sizeof (*ent); 3239 ent = bfd_alloc (abfd, amt); 3240 if (ent == NULL) 3241 return FALSE; 3242 ent->next = h->plt.plist; 3243 ent->sec = sec; 3244 ent->addend = addend; 3245 ent->plt.refcount = 0; 3246 h->plt.plist = ent; 3247 } 3248 ent->plt.refcount += 1; 3249 return TRUE; 3250 } 3251 3252 static struct plt_entry * 3253 find_plt_ent (struct elf_link_hash_entry *h, asection *sec, bfd_vma addend) 3254 { 3255 struct plt_entry *ent; 3256 3257 if (addend < 32768) 3258 sec = NULL; 3259 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 3260 if (ent->sec == sec && ent->addend == addend) 3261 break; 3262 return ent; 3263 } 3264 3265 static void 3266 bad_shared_reloc (bfd *abfd, enum elf_ppc_reloc_type r_type) 3267 { 3268 (*_bfd_error_handler) 3269 (_("%B: relocation %s cannot be used when making a shared object"), 3270 abfd, 3271 ppc_elf_howto_table[r_type]->name); 3272 bfd_set_error (bfd_error_bad_value); 3273 } 3274 3275 /* Look through the relocs for a section during the first phase, and 3276 allocate space in the global offset table or procedure linkage 3277 table. */ 3278 3279 static bfd_boolean 3280 ppc_elf_check_relocs (bfd *abfd, 3281 struct bfd_link_info *info, 3282 asection *sec, 3283 const Elf_Internal_Rela *relocs) 3284 { 3285 struct ppc_elf_link_hash_table *htab; 3286 Elf_Internal_Shdr *symtab_hdr; 3287 struct elf_link_hash_entry **sym_hashes; 3288 const Elf_Internal_Rela *rel; 3289 const Elf_Internal_Rela *rel_end; 3290 asection *got2, *sreloc; 3291 3292 if (info->relocatable) 3293 return TRUE; 3294 3295 /* Don't do anything special with non-loaded, non-alloced sections. 3296 In particular, any relocs in such sections should not affect GOT 3297 and PLT reference counting (ie. we don't allow them to create GOT 3298 or PLT entries), there's no possibility or desire to optimize TLS 3299 relocs, and there's not much point in propagating relocs to shared 3300 libs that the dynamic linker won't relocate. */ 3301 if ((sec->flags & SEC_ALLOC) == 0) 3302 return TRUE; 3303 3304 #ifdef DEBUG 3305 _bfd_error_handler ("ppc_elf_check_relocs called for section %A in %B", 3306 sec, abfd); 3307 #endif 3308 3309 BFD_ASSERT (is_ppc_elf (abfd)); 3310 3311 /* Initialize howto table if not already done. */ 3312 if (!ppc_elf_howto_table[R_PPC_ADDR32]) 3313 ppc_elf_howto_init (); 3314 3315 htab = ppc_elf_hash_table (info); 3316 symtab_hdr = &elf_symtab_hdr (abfd); 3317 sym_hashes = elf_sym_hashes (abfd); 3318 got2 = bfd_get_section_by_name (abfd, ".got2"); 3319 sreloc = NULL; 3320 3321 rel_end = relocs + sec->reloc_count; 3322 for (rel = relocs; rel < rel_end; rel++) 3323 { 3324 unsigned long r_symndx; 3325 enum elf_ppc_reloc_type r_type; 3326 struct elf_link_hash_entry *h; 3327 int tls_type = 0; 3328 3329 r_symndx = ELF32_R_SYM (rel->r_info); 3330 if (r_symndx < symtab_hdr->sh_info) 3331 h = NULL; 3332 else 3333 { 3334 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 3335 while (h->root.type == bfd_link_hash_indirect 3336 || h->root.type == bfd_link_hash_warning) 3337 h = (struct elf_link_hash_entry *) h->root.u.i.link; 3338 } 3339 3340 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got. 3341 This shows up in particular in an R_PPC_ADDR32 in the eabi 3342 startup code. */ 3343 if (h != NULL 3344 && htab->got == NULL 3345 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3346 { 3347 if (htab->elf.dynobj == NULL) 3348 htab->elf.dynobj = abfd; 3349 if (!ppc_elf_create_got (htab->elf.dynobj, info)) 3350 return FALSE; 3351 BFD_ASSERT (h == htab->elf.hgot); 3352 } 3353 3354 r_type = ELF32_R_TYPE (rel->r_info); 3355 switch (r_type) 3356 { 3357 case R_PPC_GOT_TLSLD16: 3358 case R_PPC_GOT_TLSLD16_LO: 3359 case R_PPC_GOT_TLSLD16_HI: 3360 case R_PPC_GOT_TLSLD16_HA: 3361 tls_type = TLS_TLS | TLS_LD; 3362 goto dogottls; 3363 3364 case R_PPC_GOT_TLSGD16: 3365 case R_PPC_GOT_TLSGD16_LO: 3366 case R_PPC_GOT_TLSGD16_HI: 3367 case R_PPC_GOT_TLSGD16_HA: 3368 tls_type = TLS_TLS | TLS_GD; 3369 goto dogottls; 3370 3371 case R_PPC_GOT_TPREL16: 3372 case R_PPC_GOT_TPREL16_LO: 3373 case R_PPC_GOT_TPREL16_HI: 3374 case R_PPC_GOT_TPREL16_HA: 3375 if (!info->executable) 3376 info->flags |= DF_STATIC_TLS; 3377 tls_type = TLS_TLS | TLS_TPREL; 3378 goto dogottls; 3379 3380 case R_PPC_GOT_DTPREL16: 3381 case R_PPC_GOT_DTPREL16_LO: 3382 case R_PPC_GOT_DTPREL16_HI: 3383 case R_PPC_GOT_DTPREL16_HA: 3384 tls_type = TLS_TLS | TLS_DTPREL; 3385 dogottls: 3386 sec->has_tls_reloc = 1; 3387 /* Fall thru */ 3388 3389 /* GOT16 relocations */ 3390 case R_PPC_GOT16: 3391 case R_PPC_GOT16_LO: 3392 case R_PPC_GOT16_HI: 3393 case R_PPC_GOT16_HA: 3394 /* This symbol requires a global offset table entry. */ 3395 if (htab->got == NULL) 3396 { 3397 if (htab->elf.dynobj == NULL) 3398 htab->elf.dynobj = abfd; 3399 if (!ppc_elf_create_got (htab->elf.dynobj, info)) 3400 return FALSE; 3401 } 3402 if (h != NULL) 3403 { 3404 h->got.refcount += 1; 3405 ppc_elf_hash_entry (h)->tls_mask |= tls_type; 3406 } 3407 else 3408 /* This is a global offset table entry for a local symbol. */ 3409 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, tls_type)) 3410 return FALSE; 3411 break; 3412 3413 /* Indirect .sdata relocation. */ 3414 case R_PPC_EMB_SDAI16: 3415 if (info->shared) 3416 { 3417 bad_shared_reloc (abfd, r_type); 3418 return FALSE; 3419 } 3420 if (htab->sdata[0].section == NULL 3421 && !ppc_elf_create_linker_section (abfd, info, 0, 3422 &htab->sdata[0])) 3423 return FALSE; 3424 if (!elf_create_pointer_linker_section (abfd, &htab->sdata[0], 3425 h, rel)) 3426 return FALSE; 3427 if (h != NULL) 3428 { 3429 ppc_elf_hash_entry (h)->has_sda_refs = TRUE; 3430 h->non_got_ref = TRUE; 3431 } 3432 break; 3433 3434 /* Indirect .sdata2 relocation. */ 3435 case R_PPC_EMB_SDA2I16: 3436 if (info->shared) 3437 { 3438 bad_shared_reloc (abfd, r_type); 3439 return FALSE; 3440 } 3441 if (htab->sdata[1].section == NULL 3442 && !ppc_elf_create_linker_section (abfd, info, SEC_READONLY, 3443 &htab->sdata[1])) 3444 return FALSE; 3445 if (!elf_create_pointer_linker_section (abfd, &htab->sdata[1], 3446 h, rel)) 3447 return FALSE; 3448 if (h != NULL) 3449 { 3450 ppc_elf_hash_entry (h)->has_sda_refs = TRUE; 3451 h->non_got_ref = TRUE; 3452 } 3453 break; 3454 3455 case R_PPC_SDAREL16: 3456 if (info->shared) 3457 { 3458 bad_shared_reloc (abfd, r_type); 3459 return FALSE; 3460 } 3461 if (htab->sdata[0].sym == NULL 3462 && !create_sdata_sym (htab, &htab->sdata[0])) 3463 return FALSE; 3464 if (h != NULL) 3465 { 3466 ppc_elf_hash_entry (h)->has_sda_refs = TRUE; 3467 h->non_got_ref = TRUE; 3468 } 3469 break; 3470 3471 case R_PPC_EMB_SDA2REL: 3472 if (info->shared) 3473 { 3474 bad_shared_reloc (abfd, r_type); 3475 return FALSE; 3476 } 3477 if (htab->sdata[1].sym == NULL 3478 && !create_sdata_sym (htab, &htab->sdata[1])) 3479 return FALSE; 3480 if (h != NULL) 3481 { 3482 ppc_elf_hash_entry (h)->has_sda_refs = TRUE; 3483 h->non_got_ref = TRUE; 3484 } 3485 break; 3486 3487 case R_PPC_EMB_SDA21: 3488 case R_PPC_EMB_RELSDA: 3489 if (info->shared) 3490 { 3491 bad_shared_reloc (abfd, r_type); 3492 return FALSE; 3493 } 3494 if (htab->sdata[0].sym == NULL 3495 && !create_sdata_sym (htab, &htab->sdata[0])) 3496 return FALSE; 3497 if (htab->sdata[1].sym == NULL 3498 && !create_sdata_sym (htab, &htab->sdata[1])) 3499 return FALSE; 3500 if (h != NULL) 3501 { 3502 ppc_elf_hash_entry (h)->has_sda_refs = TRUE; 3503 h->non_got_ref = TRUE; 3504 } 3505 break; 3506 3507 case R_PPC_EMB_NADDR32: 3508 case R_PPC_EMB_NADDR16: 3509 case R_PPC_EMB_NADDR16_LO: 3510 case R_PPC_EMB_NADDR16_HI: 3511 case R_PPC_EMB_NADDR16_HA: 3512 if (info->shared) 3513 { 3514 bad_shared_reloc (abfd, r_type); 3515 return FALSE; 3516 } 3517 if (h != NULL) 3518 h->non_got_ref = TRUE; 3519 break; 3520 3521 case R_PPC_PLT32: 3522 case R_PPC_PLTREL24: 3523 case R_PPC_PLTREL32: 3524 case R_PPC_PLT16_LO: 3525 case R_PPC_PLT16_HI: 3526 case R_PPC_PLT16_HA: 3527 #ifdef DEBUG 3528 fprintf (stderr, "Reloc requires a PLT entry\n"); 3529 #endif 3530 /* This symbol requires a procedure linkage table entry. We 3531 actually build the entry in finish_dynamic_symbol, 3532 because this might be a case of linking PIC code without 3533 linking in any dynamic objects, in which case we don't 3534 need to generate a procedure linkage table after all. */ 3535 3536 if (h == NULL) 3537 { 3538 /* It does not make sense to have a procedure linkage 3539 table entry for a local symbol. */ 3540 (*_bfd_error_handler) (_("%B(%A+0x%lx): %s reloc against " 3541 "local symbol"), 3542 abfd, 3543 sec, 3544 (long) rel->r_offset, 3545 ppc_elf_howto_table[r_type]->name); 3546 bfd_set_error (bfd_error_bad_value); 3547 return FALSE; 3548 } 3549 else 3550 { 3551 bfd_vma addend = 0; 3552 3553 if (r_type == R_PPC_PLTREL24) 3554 { 3555 ppc_elf_tdata (abfd)->makes_plt_call = 1; 3556 addend = rel->r_addend; 3557 } 3558 h->needs_plt = 1; 3559 if (!update_plt_info (abfd, h, got2, addend)) 3560 return FALSE; 3561 } 3562 break; 3563 3564 /* The following relocations don't need to propagate the 3565 relocation if linking a shared object since they are 3566 section relative. */ 3567 case R_PPC_SECTOFF: 3568 case R_PPC_SECTOFF_LO: 3569 case R_PPC_SECTOFF_HI: 3570 case R_PPC_SECTOFF_HA: 3571 case R_PPC_DTPREL16: 3572 case R_PPC_DTPREL16_LO: 3573 case R_PPC_DTPREL16_HI: 3574 case R_PPC_DTPREL16_HA: 3575 case R_PPC_TOC16: 3576 break; 3577 3578 case R_PPC_REL16: 3579 case R_PPC_REL16_LO: 3580 case R_PPC_REL16_HI: 3581 case R_PPC_REL16_HA: 3582 ppc_elf_tdata (abfd)->has_rel16 = 1; 3583 break; 3584 3585 /* These are just markers. */ 3586 case R_PPC_TLS: 3587 case R_PPC_EMB_MRKREF: 3588 case R_PPC_NONE: 3589 case R_PPC_max: 3590 break; 3591 3592 /* These should only appear in dynamic objects. */ 3593 case R_PPC_COPY: 3594 case R_PPC_GLOB_DAT: 3595 case R_PPC_JMP_SLOT: 3596 case R_PPC_RELATIVE: 3597 break; 3598 3599 /* These aren't handled yet. We'll report an error later. */ 3600 case R_PPC_ADDR30: 3601 case R_PPC_EMB_RELSEC16: 3602 case R_PPC_EMB_RELST_LO: 3603 case R_PPC_EMB_RELST_HI: 3604 case R_PPC_EMB_RELST_HA: 3605 case R_PPC_EMB_BIT_FLD: 3606 break; 3607 3608 /* This refers only to functions defined in the shared library. */ 3609 case R_PPC_LOCAL24PC: 3610 if (h && h == htab->elf.hgot && htab->plt_type == PLT_UNSET) 3611 { 3612 htab->plt_type = PLT_OLD; 3613 htab->old_bfd = abfd; 3614 } 3615 break; 3616 3617 /* This relocation describes the C++ object vtable hierarchy. 3618 Reconstruct it for later use during GC. */ 3619 case R_PPC_GNU_VTINHERIT: 3620 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 3621 return FALSE; 3622 break; 3623 3624 /* This relocation describes which C++ vtable entries are actually 3625 used. Record for later use during GC. */ 3626 case R_PPC_GNU_VTENTRY: 3627 BFD_ASSERT (h != NULL); 3628 if (h != NULL 3629 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 3630 return FALSE; 3631 break; 3632 3633 /* We shouldn't really be seeing these. */ 3634 case R_PPC_TPREL32: 3635 case R_PPC_TPREL16: 3636 case R_PPC_TPREL16_LO: 3637 case R_PPC_TPREL16_HI: 3638 case R_PPC_TPREL16_HA: 3639 if (!info->executable) 3640 info->flags |= DF_STATIC_TLS; 3641 goto dodyn; 3642 3643 /* Nor these. */ 3644 case R_PPC_DTPMOD32: 3645 case R_PPC_DTPREL32: 3646 goto dodyn; 3647 3648 case R_PPC_REL32: 3649 if (h == NULL 3650 && got2 != NULL 3651 && (sec->flags & SEC_CODE) != 0 3652 && (info->shared || info->pie) 3653 && htab->plt_type == PLT_UNSET) 3654 { 3655 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before 3656 the start of a function, which assembles to a REL32 3657 reference to .got2. If we detect one of these, then 3658 force the old PLT layout because the linker cannot 3659 reliably deduce the GOT pointer value needed for 3660 PLT call stubs. */ 3661 asection *s; 3662 3663 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, sec, 3664 r_symndx); 3665 if (s == got2) 3666 { 3667 htab->plt_type = PLT_OLD; 3668 htab->old_bfd = abfd; 3669 } 3670 } 3671 if (h == NULL || h == htab->elf.hgot) 3672 break; 3673 /* fall through */ 3674 3675 case R_PPC_ADDR32: 3676 case R_PPC_ADDR16: 3677 case R_PPC_ADDR16_LO: 3678 case R_PPC_ADDR16_HI: 3679 case R_PPC_ADDR16_HA: 3680 case R_PPC_UADDR32: 3681 case R_PPC_UADDR16: 3682 if (h != NULL && !info->shared) 3683 { 3684 /* We may need a plt entry if the symbol turns out to be 3685 a function defined in a dynamic object. */ 3686 if (!update_plt_info (abfd, h, NULL, 0)) 3687 return FALSE; 3688 3689 /* We may need a copy reloc too. */ 3690 h->non_got_ref = 1; 3691 h->pointer_equality_needed = 1; 3692 } 3693 goto dodyn; 3694 3695 case R_PPC_REL24: 3696 case R_PPC_REL14: 3697 case R_PPC_REL14_BRTAKEN: 3698 case R_PPC_REL14_BRNTAKEN: 3699 if (h == NULL) 3700 break; 3701 if (h == htab->elf.hgot) 3702 { 3703 if (htab->plt_type == PLT_UNSET) 3704 { 3705 htab->plt_type = PLT_OLD; 3706 htab->old_bfd = abfd; 3707 } 3708 break; 3709 } 3710 /* fall through */ 3711 3712 case R_PPC_ADDR24: 3713 case R_PPC_ADDR14: 3714 case R_PPC_ADDR14_BRTAKEN: 3715 case R_PPC_ADDR14_BRNTAKEN: 3716 if (h != NULL && !info->shared) 3717 { 3718 /* We may need a plt entry if the symbol turns out to be 3719 a function defined in a dynamic object. */ 3720 if (!update_plt_info (abfd, h, NULL, 0)) 3721 return FALSE; 3722 break; 3723 } 3724 3725 dodyn: 3726 /* If we are creating a shared library, and this is a reloc 3727 against a global symbol, or a non PC relative reloc 3728 against a local symbol, then we need to copy the reloc 3729 into the shared library. However, if we are linking with 3730 -Bsymbolic, we do not need to copy a reloc against a 3731 global symbol which is defined in an object we are 3732 including in the link (i.e., DEF_REGULAR is set). At 3733 this point we have not seen all the input files, so it is 3734 possible that DEF_REGULAR is not set now but will be set 3735 later (it is never cleared). In case of a weak definition, 3736 DEF_REGULAR may be cleared later by a strong definition in 3737 a shared library. We account for that possibility below by 3738 storing information in the dyn_relocs field of the hash 3739 table entry. A similar situation occurs when creating 3740 shared libraries and symbol visibility changes render the 3741 symbol local. 3742 3743 If on the other hand, we are creating an executable, we 3744 may need to keep relocations for symbols satisfied by a 3745 dynamic library if we manage to avoid copy relocs for the 3746 symbol. */ 3747 if ((info->shared 3748 && (must_be_dyn_reloc (info, r_type) 3749 || (h != NULL 3750 && (! info->symbolic 3751 || h->root.type == bfd_link_hash_defweak 3752 || !h->def_regular)))) 3753 || (ELIMINATE_COPY_RELOCS 3754 && !info->shared 3755 && h != NULL 3756 && (h->root.type == bfd_link_hash_defweak 3757 || !h->def_regular))) 3758 { 3759 struct ppc_elf_dyn_relocs *p; 3760 struct ppc_elf_dyn_relocs **head; 3761 3762 #ifdef DEBUG 3763 fprintf (stderr, 3764 "ppc_elf_check_relocs needs to " 3765 "create relocation for %s\n", 3766 (h && h->root.root.string 3767 ? h->root.root.string : "<unknown>")); 3768 #endif 3769 if (sreloc == NULL) 3770 { 3771 const char *name; 3772 3773 name = (bfd_elf_string_from_elf_section 3774 (abfd, 3775 elf_elfheader (abfd)->e_shstrndx, 3776 elf_section_data (sec)->rel_hdr.sh_name)); 3777 if (name == NULL) 3778 return FALSE; 3779 3780 BFD_ASSERT (CONST_STRNEQ (name, ".rela") 3781 && strcmp (bfd_get_section_name (abfd, sec), 3782 name + 5) == 0); 3783 3784 if (htab->elf.dynobj == NULL) 3785 htab->elf.dynobj = abfd; 3786 sreloc = bfd_get_section_by_name (htab->elf.dynobj, name); 3787 if (sreloc == NULL) 3788 { 3789 flagword flags; 3790 3791 flags = (SEC_HAS_CONTENTS | SEC_READONLY 3792 | SEC_IN_MEMORY | SEC_LINKER_CREATED 3793 | SEC_ALLOC | SEC_LOAD); 3794 sreloc = bfd_make_section_with_flags (htab->elf.dynobj, 3795 name, 3796 flags); 3797 if (sreloc == NULL 3798 || ! bfd_set_section_alignment (htab->elf.dynobj, 3799 sreloc, 2)) 3800 return FALSE; 3801 } 3802 elf_section_data (sec)->sreloc = sreloc; 3803 } 3804 3805 /* If this is a global symbol, we count the number of 3806 relocations we need for this symbol. */ 3807 if (h != NULL) 3808 { 3809 head = &ppc_elf_hash_entry (h)->dyn_relocs; 3810 } 3811 else 3812 { 3813 /* Track dynamic relocs needed for local syms too. 3814 We really need local syms available to do this 3815 easily. Oh well. */ 3816 3817 asection *s; 3818 void *vpp; 3819 3820 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 3821 sec, r_symndx); 3822 if (s == NULL) 3823 return FALSE; 3824 3825 vpp = &elf_section_data (s)->local_dynrel; 3826 head = (struct ppc_elf_dyn_relocs **) vpp; 3827 } 3828 3829 p = *head; 3830 if (p == NULL || p->sec != sec) 3831 { 3832 p = bfd_alloc (htab->elf.dynobj, sizeof *p); 3833 if (p == NULL) 3834 return FALSE; 3835 p->next = *head; 3836 *head = p; 3837 p->sec = sec; 3838 p->count = 0; 3839 p->pc_count = 0; 3840 } 3841 3842 p->count += 1; 3843 if (!must_be_dyn_reloc (info, r_type)) 3844 p->pc_count += 1; 3845 } 3846 3847 break; 3848 } 3849 } 3850 3851 return TRUE; 3852 } 3853 3854 3855 /* Merge object attributes from IBFD into OBFD. Raise an error if 3856 there are conflicting attributes. */ 3857 static bfd_boolean 3858 ppc_elf_merge_obj_attributes (bfd *ibfd, bfd *obfd) 3859 { 3860 obj_attribute *in_attr, *in_attrs; 3861 obj_attribute *out_attr, *out_attrs; 3862 3863 if (!elf_known_obj_attributes_proc (obfd)[0].i) 3864 { 3865 /* This is the first object. Copy the attributes. */ 3866 _bfd_elf_copy_obj_attributes (ibfd, obfd); 3867 3868 /* Use the Tag_null value to indicate the attributes have been 3869 initialized. */ 3870 elf_known_obj_attributes_proc (obfd)[0].i = 1; 3871 3872 return TRUE; 3873 } 3874 3875 in_attrs = elf_known_obj_attributes (ibfd)[OBJ_ATTR_GNU]; 3876 out_attrs = elf_known_obj_attributes (obfd)[OBJ_ATTR_GNU]; 3877 3878 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge 3879 non-conflicting ones. */ 3880 in_attr = &in_attrs[Tag_GNU_Power_ABI_FP]; 3881 out_attr = &out_attrs[Tag_GNU_Power_ABI_FP]; 3882 if (in_attr->i != out_attr->i) 3883 { 3884 out_attr->type = 1; 3885 if (out_attr->i == 0) 3886 out_attr->i = in_attr->i; 3887 else if (in_attr->i == 0) 3888 ; 3889 else if (out_attr->i == 1 && in_attr->i == 2) 3890 _bfd_error_handler 3891 (_("Warning: %B uses hard float, %B uses soft float"), obfd, ibfd); 3892 else if (out_attr->i == 1 && in_attr->i == 3) 3893 _bfd_error_handler 3894 (_("Warning: %B uses double-precision hard float, %B uses single-precision hard float"), 3895 obfd, ibfd); 3896 else if (out_attr->i == 3 && in_attr->i == 1) 3897 _bfd_error_handler 3898 (_("Warning: %B uses double-precision hard float, %B uses single-precision hard float"), 3899 ibfd, obfd); 3900 else if (out_attr->i == 3 && in_attr->i == 2) 3901 _bfd_error_handler 3902 (_("Warning: %B uses soft float, %B uses single-precision hard float"), 3903 ibfd, obfd); 3904 else if (out_attr->i == 2 && (in_attr->i == 1 || in_attr->i == 3)) 3905 _bfd_error_handler 3906 (_("Warning: %B uses hard float, %B uses soft float"), ibfd, obfd); 3907 else if (in_attr->i > 3) 3908 _bfd_error_handler 3909 (_("Warning: %B uses unknown floating point ABI %d"), ibfd, 3910 in_attr->i); 3911 else 3912 _bfd_error_handler 3913 (_("Warning: %B uses unknown floating point ABI %d"), obfd, 3914 out_attr->i); 3915 } 3916 3917 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and 3918 merge non-conflicting ones. */ 3919 in_attr = &in_attrs[Tag_GNU_Power_ABI_Vector]; 3920 out_attr = &out_attrs[Tag_GNU_Power_ABI_Vector]; 3921 if (in_attr->i != out_attr->i) 3922 { 3923 const char *in_abi = NULL, *out_abi = NULL; 3924 3925 switch (in_attr->i) 3926 { 3927 case 1: in_abi = "generic"; break; 3928 case 2: in_abi = "AltiVec"; break; 3929 case 3: in_abi = "SPE"; break; 3930 } 3931 3932 switch (out_attr->i) 3933 { 3934 case 1: out_abi = "generic"; break; 3935 case 2: out_abi = "AltiVec"; break; 3936 case 3: out_abi = "SPE"; break; 3937 } 3938 3939 out_attr->type = 1; 3940 if (out_attr->i == 0) 3941 out_attr->i = in_attr->i; 3942 else if (in_attr->i == 0) 3943 ; 3944 /* For now, allow generic to transition to AltiVec or SPE 3945 without a warning. If GCC marked files with their stack 3946 alignment and used don't-care markings for files which are 3947 not affected by the vector ABI, we could warn about this 3948 case too. */ 3949 else if (out_attr->i == 1) 3950 out_attr->i = in_attr->i; 3951 else if (in_attr->i == 1) 3952 ; 3953 else if (in_abi == NULL) 3954 _bfd_error_handler 3955 (_("Warning: %B uses unknown vector ABI %d"), ibfd, 3956 in_attr->i); 3957 else if (out_abi == NULL) 3958 _bfd_error_handler 3959 (_("Warning: %B uses unknown vector ABI %d"), obfd, 3960 in_attr->i); 3961 else 3962 _bfd_error_handler 3963 (_("Warning: %B uses vector ABI \"%s\", %B uses \"%s\""), 3964 ibfd, obfd, in_abi, out_abi); 3965 } 3966 3967 /* Check for conflicting Tag_GNU_Power_ABI_Struct_Return attributes 3968 and merge non-conflicting ones. */ 3969 in_attr = &in_attrs[Tag_GNU_Power_ABI_Struct_Return]; 3970 out_attr = &out_attrs[Tag_GNU_Power_ABI_Struct_Return]; 3971 if (in_attr->i != out_attr->i) 3972 { 3973 out_attr->type = 1; 3974 if (out_attr->i == 0) 3975 out_attr->i = in_attr->i; 3976 else if (in_attr->i == 0) 3977 ; 3978 else if (out_attr->i == 1 && in_attr->i == 2) 3979 _bfd_error_handler 3980 (_("Warning: %B uses r3/r4 for small structure returns, %B uses memory"), obfd, ibfd); 3981 else if (out_attr->i == 2 && in_attr->i == 1) 3982 _bfd_error_handler 3983 (_("Warning: %B uses r3/r4 for small structure returns, %B uses memory"), ibfd, obfd); 3984 else if (in_attr->i > 2) 3985 _bfd_error_handler 3986 (_("Warning: %B uses unknown small structure return convention %d"), ibfd, 3987 in_attr->i); 3988 else 3989 _bfd_error_handler 3990 (_("Warning: %B uses unknown small structure return convention %d"), obfd, 3991 out_attr->i); 3992 } 3993 3994 /* Merge Tag_compatibility attributes and any common GNU ones. */ 3995 _bfd_elf_merge_object_attributes (ibfd, obfd); 3996 3997 return TRUE; 3998 } 3999 4000 /* Merge backend specific data from an object file to the output 4001 object file when linking. */ 4002 4003 static bfd_boolean 4004 ppc_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 4005 { 4006 flagword old_flags; 4007 flagword new_flags; 4008 bfd_boolean error; 4009 4010 if (!is_ppc_elf (ibfd) || !is_ppc_elf (obfd)) 4011 return TRUE; 4012 4013 /* Check if we have the same endianess. */ 4014 if (! _bfd_generic_verify_endian_match (ibfd, obfd)) 4015 return FALSE; 4016 4017 if (!ppc_elf_merge_obj_attributes (ibfd, obfd)) 4018 return FALSE; 4019 4020 new_flags = elf_elfheader (ibfd)->e_flags; 4021 old_flags = elf_elfheader (obfd)->e_flags; 4022 if (!elf_flags_init (obfd)) 4023 { 4024 /* First call, no flags set. */ 4025 elf_flags_init (obfd) = TRUE; 4026 elf_elfheader (obfd)->e_flags = new_flags; 4027 } 4028 4029 /* Compatible flags are ok. */ 4030 else if (new_flags == old_flags) 4031 ; 4032 4033 /* Incompatible flags. */ 4034 else 4035 { 4036 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib 4037 to be linked with either. */ 4038 error = FALSE; 4039 if ((new_flags & EF_PPC_RELOCATABLE) != 0 4040 && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0) 4041 { 4042 error = TRUE; 4043 (*_bfd_error_handler) 4044 (_("%B: compiled with -mrelocatable and linked with " 4045 "modules compiled normally"), ibfd); 4046 } 4047 else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0 4048 && (old_flags & EF_PPC_RELOCATABLE) != 0) 4049 { 4050 error = TRUE; 4051 (*_bfd_error_handler) 4052 (_("%B: compiled normally and linked with " 4053 "modules compiled with -mrelocatable"), ibfd); 4054 } 4055 4056 /* The output is -mrelocatable-lib iff both the input files are. */ 4057 if (! (new_flags & EF_PPC_RELOCATABLE_LIB)) 4058 elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB; 4059 4060 /* The output is -mrelocatable iff it can't be -mrelocatable-lib, 4061 but each input file is either -mrelocatable or -mrelocatable-lib. */ 4062 if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB) 4063 && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)) 4064 && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))) 4065 elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE; 4066 4067 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if 4068 any module uses it. */ 4069 elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB); 4070 4071 new_flags &= ~(EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB); 4072 old_flags &= ~(EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB); 4073 4074 /* Warn about any other mismatches. */ 4075 if (new_flags != old_flags) 4076 { 4077 error = TRUE; 4078 (*_bfd_error_handler) 4079 (_("%B: uses different e_flags (0x%lx) fields " 4080 "than previous modules (0x%lx)"), 4081 ibfd, (long) new_flags, (long) old_flags); 4082 } 4083 4084 if (error) 4085 { 4086 bfd_set_error (bfd_error_bad_value); 4087 return FALSE; 4088 } 4089 } 4090 4091 return TRUE; 4092 } 4093 4094 /* Choose which PLT scheme to use, and set .plt flags appropriately. 4095 Returns -1 on error, 0 for old PLT, 1 for new PLT. */ 4096 int 4097 ppc_elf_select_plt_layout (bfd *output_bfd ATTRIBUTE_UNUSED, 4098 struct bfd_link_info *info, 4099 enum ppc_elf_plt_type plt_style, 4100 int emit_stub_syms) 4101 { 4102 struct ppc_elf_link_hash_table *htab; 4103 flagword flags; 4104 4105 htab = ppc_elf_hash_table (info); 4106 4107 if (htab->plt_type == PLT_UNSET) 4108 { 4109 if (plt_style == PLT_OLD) 4110 htab->plt_type = PLT_OLD; 4111 else 4112 { 4113 bfd *ibfd; 4114 enum ppc_elf_plt_type plt_type = plt_style; 4115 4116 /* Look through the reloc flags left by ppc_elf_check_relocs. 4117 Use the old style bss plt if a file makes plt calls 4118 without using the new relocs, and if ld isn't given 4119 --secure-plt and we never see REL16 relocs. */ 4120 if (plt_type == PLT_UNSET) 4121 plt_type = PLT_OLD; 4122 for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link_next) 4123 if (is_ppc_elf (ibfd)) 4124 { 4125 if (ppc_elf_tdata (ibfd)->has_rel16) 4126 plt_type = PLT_NEW; 4127 else if (ppc_elf_tdata (ibfd)->makes_plt_call) 4128 { 4129 plt_type = PLT_OLD; 4130 htab->old_bfd = ibfd; 4131 break; 4132 } 4133 } 4134 htab->plt_type = plt_type; 4135 } 4136 } 4137 if (htab->plt_type == PLT_OLD && plt_style == PLT_NEW) 4138 info->callbacks->info (_("Using bss-plt due to %B"), htab->old_bfd); 4139 4140 htab->emit_stub_syms = emit_stub_syms; 4141 4142 BFD_ASSERT (htab->plt_type != PLT_VXWORKS); 4143 4144 if (htab->plt_type == PLT_NEW) 4145 { 4146 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 4147 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 4148 4149 /* The new PLT is a loaded section. */ 4150 if (htab->plt != NULL 4151 && !bfd_set_section_flags (htab->elf.dynobj, htab->plt, flags)) 4152 return -1; 4153 4154 /* The new GOT is not executable. */ 4155 if (htab->got != NULL 4156 && !bfd_set_section_flags (htab->elf.dynobj, htab->got, flags)) 4157 return -1; 4158 } 4159 else 4160 { 4161 /* Stop an unused .glink section from affecting .text alignment. */ 4162 if (htab->glink != NULL 4163 && !bfd_set_section_alignment (htab->elf.dynobj, htab->glink, 0)) 4164 return -1; 4165 } 4166 return htab->plt_type == PLT_NEW; 4167 } 4168 4169 /* Return the section that should be marked against GC for a given 4170 relocation. */ 4171 4172 static asection * 4173 ppc_elf_gc_mark_hook (asection *sec, 4174 struct bfd_link_info *info, 4175 Elf_Internal_Rela *rel, 4176 struct elf_link_hash_entry *h, 4177 Elf_Internal_Sym *sym) 4178 { 4179 if (h != NULL) 4180 switch (ELF32_R_TYPE (rel->r_info)) 4181 { 4182 case R_PPC_GNU_VTINHERIT: 4183 case R_PPC_GNU_VTENTRY: 4184 return NULL; 4185 } 4186 4187 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 4188 } 4189 4190 /* Update the got, plt and dynamic reloc reference counts for the 4191 section being removed. */ 4192 4193 static bfd_boolean 4194 ppc_elf_gc_sweep_hook (bfd *abfd, 4195 struct bfd_link_info *info, 4196 asection *sec, 4197 const Elf_Internal_Rela *relocs) 4198 { 4199 struct ppc_elf_link_hash_table *htab; 4200 Elf_Internal_Shdr *symtab_hdr; 4201 struct elf_link_hash_entry **sym_hashes; 4202 bfd_signed_vma *local_got_refcounts; 4203 const Elf_Internal_Rela *rel, *relend; 4204 asection *got2; 4205 4206 if (info->relocatable) 4207 return TRUE; 4208 4209 if ((sec->flags & SEC_ALLOC) == 0) 4210 return TRUE; 4211 4212 elf_section_data (sec)->local_dynrel = NULL; 4213 4214 htab = ppc_elf_hash_table (info); 4215 symtab_hdr = &elf_symtab_hdr (abfd); 4216 sym_hashes = elf_sym_hashes (abfd); 4217 local_got_refcounts = elf_local_got_refcounts (abfd); 4218 got2 = bfd_get_section_by_name (abfd, ".got2"); 4219 4220 relend = relocs + sec->reloc_count; 4221 for (rel = relocs; rel < relend; rel++) 4222 { 4223 unsigned long r_symndx; 4224 enum elf_ppc_reloc_type r_type; 4225 struct elf_link_hash_entry *h = NULL; 4226 4227 r_symndx = ELF32_R_SYM (rel->r_info); 4228 if (r_symndx >= symtab_hdr->sh_info) 4229 { 4230 struct ppc_elf_dyn_relocs **pp, *p; 4231 struct ppc_elf_link_hash_entry *eh; 4232 4233 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4234 while (h->root.type == bfd_link_hash_indirect 4235 || h->root.type == bfd_link_hash_warning) 4236 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4237 eh = (struct ppc_elf_link_hash_entry *) h; 4238 4239 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 4240 if (p->sec == sec) 4241 { 4242 /* Everything must go for SEC. */ 4243 *pp = p->next; 4244 break; 4245 } 4246 } 4247 4248 r_type = ELF32_R_TYPE (rel->r_info); 4249 switch (r_type) 4250 { 4251 case R_PPC_GOT_TLSLD16: 4252 case R_PPC_GOT_TLSLD16_LO: 4253 case R_PPC_GOT_TLSLD16_HI: 4254 case R_PPC_GOT_TLSLD16_HA: 4255 case R_PPC_GOT_TLSGD16: 4256 case R_PPC_GOT_TLSGD16_LO: 4257 case R_PPC_GOT_TLSGD16_HI: 4258 case R_PPC_GOT_TLSGD16_HA: 4259 case R_PPC_GOT_TPREL16: 4260 case R_PPC_GOT_TPREL16_LO: 4261 case R_PPC_GOT_TPREL16_HI: 4262 case R_PPC_GOT_TPREL16_HA: 4263 case R_PPC_GOT_DTPREL16: 4264 case R_PPC_GOT_DTPREL16_LO: 4265 case R_PPC_GOT_DTPREL16_HI: 4266 case R_PPC_GOT_DTPREL16_HA: 4267 case R_PPC_GOT16: 4268 case R_PPC_GOT16_LO: 4269 case R_PPC_GOT16_HI: 4270 case R_PPC_GOT16_HA: 4271 if (h != NULL) 4272 { 4273 if (h->got.refcount > 0) 4274 h->got.refcount--; 4275 } 4276 else if (local_got_refcounts != NULL) 4277 { 4278 if (local_got_refcounts[r_symndx] > 0) 4279 local_got_refcounts[r_symndx]--; 4280 } 4281 break; 4282 4283 case R_PPC_REL24: 4284 case R_PPC_REL14: 4285 case R_PPC_REL14_BRTAKEN: 4286 case R_PPC_REL14_BRNTAKEN: 4287 case R_PPC_REL32: 4288 if (h == NULL || h == htab->elf.hgot) 4289 break; 4290 /* Fall thru */ 4291 4292 case R_PPC_ADDR32: 4293 case R_PPC_ADDR24: 4294 case R_PPC_ADDR16: 4295 case R_PPC_ADDR16_LO: 4296 case R_PPC_ADDR16_HI: 4297 case R_PPC_ADDR16_HA: 4298 case R_PPC_ADDR14: 4299 case R_PPC_ADDR14_BRTAKEN: 4300 case R_PPC_ADDR14_BRNTAKEN: 4301 case R_PPC_UADDR32: 4302 case R_PPC_UADDR16: 4303 if (info->shared) 4304 break; 4305 4306 case R_PPC_PLT32: 4307 case R_PPC_PLTREL24: 4308 case R_PPC_PLTREL32: 4309 case R_PPC_PLT16_LO: 4310 case R_PPC_PLT16_HI: 4311 case R_PPC_PLT16_HA: 4312 if (h != NULL) 4313 { 4314 bfd_vma addend = r_type == R_PPC_PLTREL24 ? rel->r_addend : 0; 4315 struct plt_entry *ent = find_plt_ent (h, got2, addend); 4316 if (ent->plt.refcount > 0) 4317 ent->plt.refcount -= 1; 4318 } 4319 break; 4320 4321 default: 4322 break; 4323 } 4324 } 4325 return TRUE; 4326 } 4327 4328 /* Set plt output section type, htab->tls_get_addr, and call the 4329 generic ELF tls_setup function. */ 4330 4331 asection * 4332 ppc_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) 4333 { 4334 struct ppc_elf_link_hash_table *htab; 4335 4336 htab = ppc_elf_hash_table (info); 4337 if (htab->plt_type == PLT_NEW 4338 && htab->plt != NULL 4339 && htab->plt->output_section != NULL) 4340 { 4341 elf_section_type (htab->plt->output_section) = SHT_PROGBITS; 4342 elf_section_flags (htab->plt->output_section) = SHF_ALLOC + SHF_WRITE; 4343 } 4344 4345 htab->tls_get_addr = elf_link_hash_lookup (&htab->elf, "__tls_get_addr", 4346 FALSE, FALSE, TRUE); 4347 return _bfd_elf_tls_setup (obfd, info); 4348 } 4349 4350 /* Return TRUE iff REL is a branch reloc with a global symbol matching 4351 HASH. */ 4352 4353 static bfd_boolean 4354 branch_reloc_hash_match (const bfd *ibfd, 4355 const Elf_Internal_Rela *rel, 4356 const struct elf_link_hash_entry *hash) 4357 { 4358 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (ibfd); 4359 enum elf_ppc_reloc_type r_type = ELF32_R_TYPE (rel->r_info); 4360 unsigned int r_symndx = ELF32_R_SYM (rel->r_info); 4361 4362 if (r_symndx >= symtab_hdr->sh_info 4363 && (r_type == R_PPC_PLTREL24 4364 || r_type == R_PPC_LOCAL24PC 4365 || r_type == R_PPC_REL14 4366 || r_type == R_PPC_REL14_BRTAKEN 4367 || r_type == R_PPC_REL14_BRNTAKEN 4368 || r_type == R_PPC_REL24 4369 || r_type == R_PPC_ADDR24 4370 || r_type == R_PPC_ADDR14 4371 || r_type == R_PPC_ADDR14_BRTAKEN 4372 || r_type == R_PPC_ADDR14_BRNTAKEN)) 4373 { 4374 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd); 4375 struct elf_link_hash_entry *h; 4376 4377 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4378 while (h->root.type == bfd_link_hash_indirect 4379 || h->root.type == bfd_link_hash_warning) 4380 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4381 if (h == hash) 4382 return TRUE; 4383 } 4384 return FALSE; 4385 } 4386 4387 /* Run through all the TLS relocs looking for optimization 4388 opportunities. */ 4389 4390 bfd_boolean 4391 ppc_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED, 4392 struct bfd_link_info *info) 4393 { 4394 bfd *ibfd; 4395 asection *sec; 4396 struct ppc_elf_link_hash_table *htab; 4397 int pass; 4398 4399 if (info->relocatable || !info->executable) 4400 return TRUE; 4401 4402 htab = ppc_elf_hash_table (info); 4403 /* Make two passes through the relocs. First time check that tls 4404 relocs involved in setting up a tls_get_addr call are indeed 4405 followed by such a call. If they are not, exclude them from 4406 the optimizations done on the second pass. */ 4407 for (pass = 0; pass < 2; ++pass) 4408 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 4409 { 4410 Elf_Internal_Sym *locsyms = NULL; 4411 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (ibfd); 4412 4413 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 4414 if (sec->has_tls_reloc && !bfd_is_abs_section (sec->output_section)) 4415 { 4416 Elf_Internal_Rela *relstart, *rel, *relend; 4417 4418 /* Read the relocations. */ 4419 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 4420 info->keep_memory); 4421 if (relstart == NULL) 4422 return FALSE; 4423 4424 relend = relstart + sec->reloc_count; 4425 for (rel = relstart; rel < relend; rel++) 4426 { 4427 enum elf_ppc_reloc_type r_type; 4428 unsigned long r_symndx; 4429 struct elf_link_hash_entry *h = NULL; 4430 char *tls_mask; 4431 char tls_set, tls_clear; 4432 bfd_boolean is_local; 4433 int expecting_tls_get_addr; 4434 bfd_signed_vma *got_count; 4435 4436 r_symndx = ELF32_R_SYM (rel->r_info); 4437 if (r_symndx >= symtab_hdr->sh_info) 4438 { 4439 struct elf_link_hash_entry **sym_hashes; 4440 4441 sym_hashes = elf_sym_hashes (ibfd); 4442 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4443 while (h->root.type == bfd_link_hash_indirect 4444 || h->root.type == bfd_link_hash_warning) 4445 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4446 } 4447 4448 expecting_tls_get_addr = 0; 4449 is_local = FALSE; 4450 if (h == NULL 4451 || !h->def_dynamic) 4452 is_local = TRUE; 4453 4454 r_type = ELF32_R_TYPE (rel->r_info); 4455 switch (r_type) 4456 { 4457 case R_PPC_GOT_TLSLD16: 4458 case R_PPC_GOT_TLSLD16_LO: 4459 expecting_tls_get_addr = 1; 4460 /* Fall thru */ 4461 4462 case R_PPC_GOT_TLSLD16_HI: 4463 case R_PPC_GOT_TLSLD16_HA: 4464 /* These relocs should never be against a symbol 4465 defined in a shared lib. Leave them alone if 4466 that turns out to be the case. */ 4467 if (!is_local) 4468 continue; 4469 4470 /* LD -> LE */ 4471 tls_set = 0; 4472 tls_clear = TLS_LD; 4473 break; 4474 4475 case R_PPC_GOT_TLSGD16: 4476 case R_PPC_GOT_TLSGD16_LO: 4477 expecting_tls_get_addr = 1; 4478 /* Fall thru */ 4479 4480 case R_PPC_GOT_TLSGD16_HI: 4481 case R_PPC_GOT_TLSGD16_HA: 4482 if (is_local) 4483 /* GD -> LE */ 4484 tls_set = 0; 4485 else 4486 /* GD -> IE */ 4487 tls_set = TLS_TLS | TLS_TPRELGD; 4488 tls_clear = TLS_GD; 4489 break; 4490 4491 case R_PPC_GOT_TPREL16: 4492 case R_PPC_GOT_TPREL16_LO: 4493 case R_PPC_GOT_TPREL16_HI: 4494 case R_PPC_GOT_TPREL16_HA: 4495 if (is_local) 4496 { 4497 /* IE -> LE */ 4498 tls_set = 0; 4499 tls_clear = TLS_TPREL; 4500 break; 4501 } 4502 else 4503 continue; 4504 4505 default: 4506 continue; 4507 } 4508 4509 if (pass == 0) 4510 { 4511 if (!expecting_tls_get_addr) 4512 continue; 4513 4514 if (rel + 1 < relend 4515 && branch_reloc_hash_match (ibfd, rel + 1, 4516 htab->tls_get_addr)) 4517 continue; 4518 4519 /* Uh oh, we didn't find the expected call. We 4520 could just mark this symbol to exclude it 4521 from tls optimization but it's safer to skip 4522 the entire section. */ 4523 sec->has_tls_reloc = 0; 4524 break; 4525 } 4526 4527 if (h != NULL) 4528 { 4529 tls_mask = &ppc_elf_hash_entry (h)->tls_mask; 4530 got_count = &h->got.refcount; 4531 } 4532 else 4533 { 4534 Elf_Internal_Sym *sym; 4535 bfd_signed_vma *lgot_refs; 4536 char *lgot_masks; 4537 4538 if (locsyms == NULL) 4539 { 4540 locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; 4541 if (locsyms == NULL) 4542 locsyms = bfd_elf_get_elf_syms (ibfd, symtab_hdr, 4543 symtab_hdr->sh_info, 4544 0, NULL, NULL, NULL); 4545 if (locsyms == NULL) 4546 { 4547 if (elf_section_data (sec)->relocs != relstart) 4548 free (relstart); 4549 return FALSE; 4550 } 4551 } 4552 sym = locsyms + r_symndx; 4553 lgot_refs = elf_local_got_refcounts (ibfd); 4554 if (lgot_refs == NULL) 4555 abort (); 4556 lgot_masks = (char *) (lgot_refs + symtab_hdr->sh_info); 4557 tls_mask = &lgot_masks[r_symndx]; 4558 got_count = &lgot_refs[r_symndx]; 4559 } 4560 4561 if (tls_set == 0) 4562 { 4563 /* We managed to get rid of a got entry. */ 4564 if (*got_count > 0) 4565 *got_count -= 1; 4566 } 4567 4568 if (expecting_tls_get_addr) 4569 { 4570 struct plt_entry *ent; 4571 4572 ent = find_plt_ent (htab->tls_get_addr, NULL, 0); 4573 if (ent != NULL && ent->plt.refcount > 0) 4574 ent->plt.refcount -= 1; 4575 } 4576 4577 *tls_mask |= tls_set; 4578 *tls_mask &= ~tls_clear; 4579 } 4580 4581 if (elf_section_data (sec)->relocs != relstart) 4582 free (relstart); 4583 } 4584 4585 if (locsyms != NULL 4586 && (symtab_hdr->contents != (unsigned char *) locsyms)) 4587 { 4588 if (!info->keep_memory) 4589 free (locsyms); 4590 else 4591 symtab_hdr->contents = (unsigned char *) locsyms; 4592 } 4593 } 4594 return TRUE; 4595 } 4596 4597 /* Return true if we have dynamic relocs that apply to read-only sections. */ 4598 4599 static bfd_boolean 4600 readonly_dynrelocs (struct elf_link_hash_entry *h) 4601 { 4602 struct ppc_elf_dyn_relocs *p; 4603 4604 for (p = ppc_elf_hash_entry (h)->dyn_relocs; p != NULL; p = p->next) 4605 { 4606 asection *s = p->sec->output_section; 4607 4608 if (s != NULL 4609 && ((s->flags & (SEC_READONLY | SEC_ALLOC)) 4610 == (SEC_READONLY | SEC_ALLOC))) 4611 return TRUE; 4612 } 4613 return FALSE; 4614 } 4615 4616 /* Adjust a symbol defined by a dynamic object and referenced by a 4617 regular object. The current definition is in some section of the 4618 dynamic object, but we're not including those sections. We have to 4619 change the definition to something the rest of the link can 4620 understand. */ 4621 4622 static bfd_boolean 4623 ppc_elf_adjust_dynamic_symbol (struct bfd_link_info *info, 4624 struct elf_link_hash_entry *h) 4625 { 4626 struct ppc_elf_link_hash_table *htab; 4627 asection *s; 4628 4629 #ifdef DEBUG 4630 fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", 4631 h->root.root.string); 4632 #endif 4633 4634 /* Make sure we know what is going on here. */ 4635 htab = ppc_elf_hash_table (info); 4636 BFD_ASSERT (htab->elf.dynobj != NULL 4637 && (h->needs_plt 4638 || h->u.weakdef != NULL 4639 || (h->def_dynamic 4640 && h->ref_regular 4641 && !h->def_regular))); 4642 4643 /* Deal with function syms. */ 4644 if (h->type == STT_FUNC 4645 || h->needs_plt) 4646 { 4647 /* Clear procedure linkage table information for any symbol that 4648 won't need a .plt entry. */ 4649 struct plt_entry *ent; 4650 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 4651 if (ent->plt.refcount > 0) 4652 break; 4653 if (ent == NULL 4654 || SYMBOL_CALLS_LOCAL (info, h) 4655 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 4656 && h->root.type == bfd_link_hash_undefweak)) 4657 { 4658 /* A PLT entry is not required/allowed when: 4659 4660 1. We are not using ld.so; because then the PLT entry 4661 can't be set up, so we can't use one. In this case, 4662 ppc_elf_adjust_dynamic_symbol won't even be called. 4663 4664 2. GC has rendered the entry unused. 4665 4666 3. We know for certain that a call to this symbol 4667 will go to this object, or will remain undefined. */ 4668 h->plt.plist = NULL; 4669 h->needs_plt = 0; 4670 } 4671 else 4672 { 4673 /* After adjust_dynamic_symbol, non_got_ref set means that 4674 dyn_relocs for this symbol should be discarded. 4675 If we get here we know we are making a PLT entry for this 4676 symbol, and in an executable we'd normally resolve 4677 relocations against this symbol to the PLT entry. Allow 4678 dynamic relocs if the reference is weak, and the dynamic 4679 relocs will not cause text relocation. */ 4680 if (!h->ref_regular_nonweak 4681 && h->non_got_ref 4682 && !htab->is_vxworks 4683 && !ppc_elf_hash_entry (h)->has_sda_refs 4684 && !readonly_dynrelocs (h)) 4685 h->non_got_ref = 0; 4686 } 4687 return TRUE; 4688 } 4689 else 4690 h->plt.plist = NULL; 4691 4692 /* If this is a weak symbol, and there is a real definition, the 4693 processor independent code will have arranged for us to see the 4694 real definition first, and we can just use the same value. */ 4695 if (h->u.weakdef != NULL) 4696 { 4697 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 4698 || h->u.weakdef->root.type == bfd_link_hash_defweak); 4699 h->root.u.def.section = h->u.weakdef->root.u.def.section; 4700 h->root.u.def.value = h->u.weakdef->root.u.def.value; 4701 if (ELIMINATE_COPY_RELOCS) 4702 h->non_got_ref = h->u.weakdef->non_got_ref; 4703 return TRUE; 4704 } 4705 4706 /* This is a reference to a symbol defined by a dynamic object which 4707 is not a function. */ 4708 4709 /* If we are creating a shared library, we must presume that the 4710 only references to the symbol are via the global offset table. 4711 For such cases we need not do anything here; the relocations will 4712 be handled correctly by relocate_section. */ 4713 if (info->shared) 4714 return TRUE; 4715 4716 /* If there are no references to this symbol that do not use the 4717 GOT, we don't need to generate a copy reloc. */ 4718 if (!h->non_got_ref) 4719 return TRUE; 4720 4721 /* If we didn't find any dynamic relocs in read-only sections, then 4722 we'll be keeping the dynamic relocs and avoiding the copy reloc. 4723 We can't do this if there are any small data relocations. This 4724 doesn't work on VxWorks, where we can not have dynamic 4725 relocations (other than copy and jump slot relocations) in an 4726 executable. */ 4727 if (ELIMINATE_COPY_RELOCS 4728 && !ppc_elf_hash_entry (h)->has_sda_refs 4729 && !htab->is_vxworks 4730 && !h->def_regular 4731 && !readonly_dynrelocs (h)) 4732 { 4733 h->non_got_ref = 0; 4734 return TRUE; 4735 } 4736 4737 if (h->size == 0) 4738 { 4739 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 4740 h->root.root.string); 4741 return TRUE; 4742 } 4743 4744 /* We must allocate the symbol in our .dynbss section, which will 4745 become part of the .bss section of the executable. There will be 4746 an entry for this symbol in the .dynsym section. The dynamic 4747 object will contain position independent code, so all references 4748 from the dynamic object to this symbol will go through the global 4749 offset table. The dynamic linker will use the .dynsym entry to 4750 determine the address it must put in the global offset table, so 4751 both the dynamic object and the regular object will refer to the 4752 same memory location for the variable. 4753 4754 Of course, if the symbol is referenced using SDAREL relocs, we 4755 must instead allocate it in .sbss. */ 4756 4757 if (ppc_elf_hash_entry (h)->has_sda_refs) 4758 s = htab->dynsbss; 4759 else 4760 s = htab->dynbss; 4761 BFD_ASSERT (s != NULL); 4762 4763 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to 4764 copy the initial value out of the dynamic object and into the 4765 runtime process image. We need to remember the offset into the 4766 .rela.bss section we are going to use. */ 4767 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 4768 { 4769 asection *srel; 4770 4771 if (ppc_elf_hash_entry (h)->has_sda_refs) 4772 srel = htab->relsbss; 4773 else 4774 srel = htab->relbss; 4775 BFD_ASSERT (srel != NULL); 4776 srel->size += sizeof (Elf32_External_Rela); 4777 h->needs_copy = 1; 4778 } 4779 4780 return _bfd_elf_adjust_dynamic_copy (h, s); 4781 } 4782 4783 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is 4784 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0, 4785 specifying the addend on the plt relocation. For -fpic code, the sym 4786 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC 4787 xxxxxxxx.got2.plt_pic32.<callee>. */ 4788 4789 static bfd_boolean 4790 add_stub_sym (struct plt_entry *ent, 4791 struct elf_link_hash_entry *h, 4792 struct bfd_link_info *info) 4793 { 4794 struct elf_link_hash_entry *sh; 4795 size_t len1, len2, len3; 4796 char *name; 4797 const char *stub; 4798 struct ppc_elf_link_hash_table *htab = ppc_elf_hash_table (info); 4799 4800 if (info->shared || info->pie) 4801 stub = ".plt_pic32."; 4802 else 4803 stub = ".plt_call32."; 4804 4805 len1 = strlen (h->root.root.string); 4806 len2 = strlen (stub); 4807 len3 = 0; 4808 if (ent->sec) 4809 len3 = strlen (ent->sec->name); 4810 name = bfd_malloc (len1 + len2 + len3 + 9); 4811 if (name == NULL) 4812 return FALSE; 4813 sprintf (name, "%08x", (unsigned) ent->addend & 0xffffffff); 4814 if (ent->sec) 4815 memcpy (name + 8, ent->sec->name, len3); 4816 memcpy (name + 8 + len3, stub, len2); 4817 memcpy (name + 8 + len3 + len2, h->root.root.string, len1 + 1); 4818 sh = elf_link_hash_lookup (&htab->elf, name, TRUE, FALSE, FALSE); 4819 if (sh == NULL) 4820 return FALSE; 4821 if (sh->root.type == bfd_link_hash_new) 4822 { 4823 sh->root.type = bfd_link_hash_defined; 4824 sh->root.u.def.section = htab->glink; 4825 sh->root.u.def.value = ent->glink_offset; 4826 sh->ref_regular = 1; 4827 sh->def_regular = 1; 4828 sh->ref_regular_nonweak = 1; 4829 sh->forced_local = 1; 4830 sh->non_elf = 0; 4831 } 4832 return TRUE; 4833 } 4834 4835 /* Allocate NEED contiguous space in .got, and return the offset. 4836 Handles allocation of the got header when crossing 32k. */ 4837 4838 static bfd_vma 4839 allocate_got (struct ppc_elf_link_hash_table *htab, unsigned int need) 4840 { 4841 bfd_vma where; 4842 unsigned int max_before_header; 4843 4844 if (htab->plt_type == PLT_VXWORKS) 4845 { 4846 where = htab->got->size; 4847 htab->got->size += need; 4848 } 4849 else 4850 { 4851 max_before_header = htab->plt_type == PLT_NEW ? 32768 : 32764; 4852 if (need <= htab->got_gap) 4853 { 4854 where = max_before_header - htab->got_gap; 4855 htab->got_gap -= need; 4856 } 4857 else 4858 { 4859 if (htab->got->size + need > max_before_header 4860 && htab->got->size <= max_before_header) 4861 { 4862 htab->got_gap = max_before_header - htab->got->size; 4863 htab->got->size = max_before_header + htab->got_header_size; 4864 } 4865 where = htab->got->size; 4866 htab->got->size += need; 4867 } 4868 } 4869 return where; 4870 } 4871 4872 /* Allocate space in associated reloc sections for dynamic relocs. */ 4873 4874 static bfd_boolean 4875 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 4876 { 4877 struct bfd_link_info *info = inf; 4878 struct ppc_elf_link_hash_entry *eh; 4879 struct ppc_elf_link_hash_table *htab; 4880 struct ppc_elf_dyn_relocs *p; 4881 4882 if (h->root.type == bfd_link_hash_indirect) 4883 return TRUE; 4884 4885 if (h->root.type == bfd_link_hash_warning) 4886 /* When warning symbols are created, they **replace** the "real" 4887 entry in the hash table, thus we never get to see the real 4888 symbol in a hash traversal. So look at it now. */ 4889 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4890 4891 htab = ppc_elf_hash_table (info); 4892 if (htab->elf.dynamic_sections_created) 4893 { 4894 struct plt_entry *ent; 4895 bfd_boolean doneone = FALSE; 4896 bfd_vma plt_offset = 0, glink_offset = 0; 4897 4898 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 4899 if (ent->plt.refcount > 0) 4900 { 4901 /* Make sure this symbol is output as a dynamic symbol. */ 4902 if (h->dynindx == -1 4903 && !h->forced_local) 4904 { 4905 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 4906 return FALSE; 4907 } 4908 4909 if (info->shared 4910 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 4911 { 4912 asection *s = htab->plt; 4913 4914 if (htab->plt_type == PLT_NEW) 4915 { 4916 if (!doneone) 4917 { 4918 plt_offset = s->size; 4919 s->size += 4; 4920 } 4921 ent->plt.offset = plt_offset; 4922 4923 s = htab->glink; 4924 if (!doneone || info->shared || info->pie) 4925 { 4926 glink_offset = s->size; 4927 s->size += GLINK_ENTRY_SIZE; 4928 } 4929 if (!doneone 4930 && !info->shared 4931 && h->def_dynamic 4932 && !h->def_regular) 4933 { 4934 h->root.u.def.section = s; 4935 h->root.u.def.value = glink_offset; 4936 } 4937 ent->glink_offset = glink_offset; 4938 4939 if (htab->emit_stub_syms 4940 && !add_stub_sym (ent, h, info)) 4941 return FALSE; 4942 } 4943 else 4944 { 4945 if (!doneone) 4946 { 4947 /* If this is the first .plt entry, make room 4948 for the special first entry. */ 4949 if (s->size == 0) 4950 s->size += htab->plt_initial_entry_size; 4951 4952 /* The PowerPC PLT is actually composed of two 4953 parts, the first part is 2 words (for a load 4954 and a jump), and then there is a remaining 4955 word available at the end. */ 4956 plt_offset = (htab->plt_initial_entry_size 4957 + (htab->plt_slot_size 4958 * ((s->size 4959 - htab->plt_initial_entry_size) 4960 / htab->plt_entry_size))); 4961 4962 /* If this symbol is not defined in a regular 4963 file, and we are not generating a shared 4964 library, then set the symbol to this location 4965 in the .plt. This is required to make 4966 function pointers compare as equal between 4967 the normal executable and the shared library. */ 4968 if (! info->shared 4969 && h->def_dynamic 4970 && !h->def_regular) 4971 { 4972 h->root.u.def.section = s; 4973 h->root.u.def.value = plt_offset; 4974 } 4975 4976 /* Make room for this entry. */ 4977 s->size += htab->plt_entry_size; 4978 /* After the 8192nd entry, room for two entries 4979 is allocated. */ 4980 if (htab->plt_type == PLT_OLD 4981 && (s->size - htab->plt_initial_entry_size) 4982 / htab->plt_entry_size 4983 > PLT_NUM_SINGLE_ENTRIES) 4984 s->size += htab->plt_entry_size; 4985 } 4986 ent->plt.offset = plt_offset; 4987 } 4988 4989 /* We also need to make an entry in the .rela.plt section. */ 4990 if (!doneone) 4991 { 4992 htab->relplt->size += sizeof (Elf32_External_Rela); 4993 4994 if (htab->plt_type == PLT_VXWORKS) 4995 { 4996 /* Allocate space for the unloaded relocations. */ 4997 if (!info->shared) 4998 { 4999 if (ent->plt.offset 5000 == (bfd_vma) htab->plt_initial_entry_size) 5001 { 5002 htab->srelplt2->size 5003 += sizeof (Elf32_External_Rela) 5004 * VXWORKS_PLTRESOLVE_RELOCS; 5005 } 5006 5007 htab->srelplt2->size 5008 += sizeof (Elf32_External_Rela) 5009 * VXWORKS_PLT_NON_JMP_SLOT_RELOCS; 5010 } 5011 5012 /* Every PLT entry has an associated GOT entry in 5013 .got.plt. */ 5014 htab->sgotplt->size += 4; 5015 } 5016 doneone = TRUE; 5017 } 5018 } 5019 else 5020 ent->plt.offset = (bfd_vma) -1; 5021 } 5022 else 5023 ent->plt.offset = (bfd_vma) -1; 5024 5025 if (!doneone) 5026 { 5027 h->plt.plist = NULL; 5028 h->needs_plt = 0; 5029 } 5030 } 5031 else 5032 { 5033 h->plt.plist = NULL; 5034 h->needs_plt = 0; 5035 } 5036 5037 eh = (struct ppc_elf_link_hash_entry *) h; 5038 if (eh->elf.got.refcount > 0) 5039 { 5040 bfd_boolean dyn; 5041 unsigned int need; 5042 5043 /* Make sure this symbol is output as a dynamic symbol. */ 5044 if (eh->elf.dynindx == -1 5045 && !eh->elf.forced_local 5046 && htab->elf.dynamic_sections_created) 5047 { 5048 if (!bfd_elf_link_record_dynamic_symbol (info, &eh->elf)) 5049 return FALSE; 5050 } 5051 5052 need = 0; 5053 if ((eh->tls_mask & TLS_TLS) != 0) 5054 { 5055 if ((eh->tls_mask & TLS_LD) != 0) 5056 { 5057 if (!eh->elf.def_dynamic) 5058 /* We'll just use htab->tlsld_got.offset. This should 5059 always be the case. It's a little odd if we have 5060 a local dynamic reloc against a non-local symbol. */ 5061 htab->tlsld_got.refcount += 1; 5062 else 5063 need += 8; 5064 } 5065 if ((eh->tls_mask & TLS_GD) != 0) 5066 need += 8; 5067 if ((eh->tls_mask & (TLS_TPREL | TLS_TPRELGD)) != 0) 5068 need += 4; 5069 if ((eh->tls_mask & TLS_DTPREL) != 0) 5070 need += 4; 5071 } 5072 else 5073 need += 4; 5074 if (need == 0) 5075 eh->elf.got.offset = (bfd_vma) -1; 5076 else 5077 { 5078 eh->elf.got.offset = allocate_got (htab, need); 5079 dyn = htab->elf.dynamic_sections_created; 5080 if ((info->shared 5081 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, &eh->elf)) 5082 && (ELF_ST_VISIBILITY (eh->elf.other) == STV_DEFAULT 5083 || eh->elf.root.type != bfd_link_hash_undefweak)) 5084 { 5085 /* All the entries we allocated need relocs. 5086 Except LD only needs one. */ 5087 if ((eh->tls_mask & TLS_LD) != 0 5088 && eh->elf.def_dynamic) 5089 need -= 4; 5090 htab->relgot->size += need * (sizeof (Elf32_External_Rela) / 4); 5091 } 5092 } 5093 } 5094 else 5095 eh->elf.got.offset = (bfd_vma) -1; 5096 5097 if (eh->dyn_relocs == NULL 5098 || !htab->elf.dynamic_sections_created) 5099 return TRUE; 5100 5101 /* In the shared -Bsymbolic case, discard space allocated for 5102 dynamic pc-relative relocs against symbols which turn out to be 5103 defined in regular objects. For the normal shared case, discard 5104 space for relocs that have become local due to symbol visibility 5105 changes. */ 5106 5107 if (info->shared) 5108 { 5109 /* Relocs that use pc_count are those that appear on a call insn, 5110 or certain REL relocs (see must_be_dyn_reloc) that can be 5111 generated via assembly. We want calls to protected symbols to 5112 resolve directly to the function rather than going via the plt. 5113 If people want function pointer comparisons to work as expected 5114 then they should avoid writing weird assembly. */ 5115 if (SYMBOL_CALLS_LOCAL (info, h)) 5116 { 5117 struct ppc_elf_dyn_relocs **pp; 5118 5119 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 5120 { 5121 p->count -= p->pc_count; 5122 p->pc_count = 0; 5123 if (p->count == 0) 5124 *pp = p->next; 5125 else 5126 pp = &p->next; 5127 } 5128 } 5129 5130 if (htab->is_vxworks) 5131 { 5132 struct ppc_elf_dyn_relocs **pp; 5133 5134 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 5135 { 5136 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) 5137 *pp = p->next; 5138 else 5139 pp = &p->next; 5140 } 5141 } 5142 5143 /* Discard relocs on undefined symbols that must be local. */ 5144 if (eh->dyn_relocs != NULL 5145 && h->root.type == bfd_link_hash_undefined 5146 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN 5147 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)) 5148 eh->dyn_relocs = NULL; 5149 5150 /* Also discard relocs on undefined weak syms with non-default 5151 visibility. */ 5152 if (eh->dyn_relocs != NULL 5153 && h->root.type == bfd_link_hash_undefweak) 5154 { 5155 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 5156 eh->dyn_relocs = NULL; 5157 5158 /* Make sure undefined weak symbols are output as a dynamic 5159 symbol in PIEs. */ 5160 else if (h->dynindx == -1 5161 && !h->forced_local) 5162 { 5163 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 5164 return FALSE; 5165 } 5166 } 5167 } 5168 else if (ELIMINATE_COPY_RELOCS) 5169 { 5170 /* For the non-shared case, discard space for relocs against 5171 symbols which turn out to need copy relocs or are not 5172 dynamic. */ 5173 5174 if (!h->non_got_ref 5175 && !h->def_regular) 5176 { 5177 /* Make sure this symbol is output as a dynamic symbol. 5178 Undefined weak syms won't yet be marked as dynamic. */ 5179 if (h->dynindx == -1 5180 && !h->forced_local) 5181 { 5182 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 5183 return FALSE; 5184 } 5185 5186 /* If that succeeded, we know we'll be keeping all the 5187 relocs. */ 5188 if (h->dynindx != -1) 5189 goto keep; 5190 } 5191 5192 eh->dyn_relocs = NULL; 5193 5194 keep: ; 5195 } 5196 5197 /* Finally, allocate space. */ 5198 for (p = eh->dyn_relocs; p != NULL; p = p->next) 5199 { 5200 asection *sreloc = elf_section_data (p->sec)->sreloc; 5201 sreloc->size += p->count * sizeof (Elf32_External_Rela); 5202 } 5203 5204 return TRUE; 5205 } 5206 5207 /* Set DF_TEXTREL if we find any dynamic relocs that apply to 5208 read-only sections. */ 5209 5210 static bfd_boolean 5211 maybe_set_textrel (struct elf_link_hash_entry *h, void *info) 5212 { 5213 if (h->root.type == bfd_link_hash_indirect) 5214 return TRUE; 5215 5216 if (h->root.type == bfd_link_hash_warning) 5217 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5218 5219 if (readonly_dynrelocs (h)) 5220 { 5221 ((struct bfd_link_info *) info)->flags |= DF_TEXTREL; 5222 5223 /* Not an error, just cut short the traversal. */ 5224 return FALSE; 5225 } 5226 return TRUE; 5227 } 5228 5229 /* Set the sizes of the dynamic sections. */ 5230 5231 static bfd_boolean 5232 ppc_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 5233 struct bfd_link_info *info) 5234 { 5235 struct ppc_elf_link_hash_table *htab; 5236 asection *s; 5237 bfd_boolean relocs; 5238 bfd *ibfd; 5239 5240 #ifdef DEBUG 5241 fprintf (stderr, "ppc_elf_size_dynamic_sections called\n"); 5242 #endif 5243 5244 htab = ppc_elf_hash_table (info); 5245 BFD_ASSERT (htab->elf.dynobj != NULL); 5246 5247 if (elf_hash_table (info)->dynamic_sections_created) 5248 { 5249 /* Set the contents of the .interp section to the interpreter. */ 5250 if (info->executable) 5251 { 5252 s = bfd_get_section_by_name (htab->elf.dynobj, ".interp"); 5253 BFD_ASSERT (s != NULL); 5254 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 5255 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 5256 } 5257 } 5258 5259 if (htab->plt_type == PLT_OLD) 5260 htab->got_header_size = 16; 5261 else if (htab->plt_type == PLT_NEW) 5262 htab->got_header_size = 12; 5263 5264 /* Set up .got offsets for local syms, and space for local dynamic 5265 relocs. */ 5266 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 5267 { 5268 bfd_signed_vma *local_got; 5269 bfd_signed_vma *end_local_got; 5270 char *lgot_masks; 5271 bfd_size_type locsymcount; 5272 Elf_Internal_Shdr *symtab_hdr; 5273 5274 if (!is_ppc_elf (ibfd)) 5275 continue; 5276 5277 for (s = ibfd->sections; s != NULL; s = s->next) 5278 { 5279 struct ppc_elf_dyn_relocs *p; 5280 5281 for (p = ((struct ppc_elf_dyn_relocs *) 5282 elf_section_data (s)->local_dynrel); 5283 p != NULL; 5284 p = p->next) 5285 { 5286 if (!bfd_is_abs_section (p->sec) 5287 && bfd_is_abs_section (p->sec->output_section)) 5288 { 5289 /* Input section has been discarded, either because 5290 it is a copy of a linkonce section or due to 5291 linker script /DISCARD/, so we'll be discarding 5292 the relocs too. */ 5293 } 5294 else if (htab->is_vxworks 5295 && strcmp (p->sec->output_section->name, 5296 ".tls_vars") == 0) 5297 { 5298 /* Relocations in vxworks .tls_vars sections are 5299 handled specially by the loader. */ 5300 } 5301 else if (p->count != 0) 5302 { 5303 elf_section_data (p->sec)->sreloc->size 5304 += p->count * sizeof (Elf32_External_Rela); 5305 if ((p->sec->output_section->flags 5306 & (SEC_READONLY | SEC_ALLOC)) 5307 == (SEC_READONLY | SEC_ALLOC)) 5308 info->flags |= DF_TEXTREL; 5309 } 5310 } 5311 } 5312 5313 local_got = elf_local_got_refcounts (ibfd); 5314 if (!local_got) 5315 continue; 5316 5317 symtab_hdr = &elf_symtab_hdr (ibfd); 5318 locsymcount = symtab_hdr->sh_info; 5319 end_local_got = local_got + locsymcount; 5320 lgot_masks = (char *) end_local_got; 5321 for (; local_got < end_local_got; ++local_got, ++lgot_masks) 5322 if (*local_got > 0) 5323 { 5324 unsigned int need = 0; 5325 if ((*lgot_masks & TLS_TLS) != 0) 5326 { 5327 if ((*lgot_masks & TLS_GD) != 0) 5328 need += 8; 5329 if ((*lgot_masks & TLS_LD) != 0) 5330 htab->tlsld_got.refcount += 1; 5331 if ((*lgot_masks & (TLS_TPREL | TLS_TPRELGD)) != 0) 5332 need += 4; 5333 if ((*lgot_masks & TLS_DTPREL) != 0) 5334 need += 4; 5335 } 5336 else 5337 need += 4; 5338 if (need == 0) 5339 *local_got = (bfd_vma) -1; 5340 else 5341 { 5342 *local_got = allocate_got (htab, need); 5343 if (info->shared) 5344 htab->relgot->size += (need 5345 * (sizeof (Elf32_External_Rela) / 4)); 5346 } 5347 } 5348 else 5349 *local_got = (bfd_vma) -1; 5350 } 5351 5352 /* Allocate space for global sym dynamic relocs. */ 5353 elf_link_hash_traverse (elf_hash_table (info), allocate_dynrelocs, info); 5354 5355 if (htab->tlsld_got.refcount > 0) 5356 { 5357 htab->tlsld_got.offset = allocate_got (htab, 8); 5358 if (info->shared) 5359 htab->relgot->size += sizeof (Elf32_External_Rela); 5360 } 5361 else 5362 htab->tlsld_got.offset = (bfd_vma) -1; 5363 5364 if (htab->got != NULL && htab->plt_type != PLT_VXWORKS) 5365 { 5366 unsigned int g_o_t = 32768; 5367 5368 /* If we haven't allocated the header, do so now. When we get here, 5369 for old plt/got the got size will be 0 to 32764 (not allocated), 5370 or 32780 to 65536 (header allocated). For new plt/got, the 5371 corresponding ranges are 0 to 32768 and 32780 to 65536. */ 5372 if (htab->got->size <= 32768) 5373 { 5374 g_o_t = htab->got->size; 5375 if (htab->plt_type == PLT_OLD) 5376 g_o_t += 4; 5377 htab->got->size += htab->got_header_size; 5378 } 5379 5380 htab->elf.hgot->root.u.def.value = g_o_t; 5381 } 5382 5383 if (htab->glink != NULL && htab->glink->size != 0) 5384 { 5385 htab->glink_pltresolve = htab->glink->size; 5386 /* Space for the branch table. */ 5387 htab->glink->size += htab->glink->size / (GLINK_ENTRY_SIZE / 4) - 4; 5388 /* Pad out to align the start of PLTresolve. */ 5389 htab->glink->size += -htab->glink->size & 15; 5390 htab->glink->size += GLINK_PLTRESOLVE; 5391 5392 if (htab->emit_stub_syms) 5393 { 5394 struct elf_link_hash_entry *sh; 5395 sh = elf_link_hash_lookup (&htab->elf, "__glink", 5396 TRUE, FALSE, FALSE); 5397 if (sh == NULL) 5398 return FALSE; 5399 if (sh->root.type == bfd_link_hash_new) 5400 { 5401 sh->root.type = bfd_link_hash_defined; 5402 sh->root.u.def.section = htab->glink; 5403 sh->root.u.def.value = htab->glink_pltresolve; 5404 sh->ref_regular = 1; 5405 sh->def_regular = 1; 5406 sh->ref_regular_nonweak = 1; 5407 sh->forced_local = 1; 5408 sh->non_elf = 0; 5409 } 5410 sh = elf_link_hash_lookup (&htab->elf, "__glink_PLTresolve", 5411 TRUE, FALSE, FALSE); 5412 if (sh == NULL) 5413 return FALSE; 5414 if (sh->root.type == bfd_link_hash_new) 5415 { 5416 sh->root.type = bfd_link_hash_defined; 5417 sh->root.u.def.section = htab->glink; 5418 sh->root.u.def.value = htab->glink->size - GLINK_PLTRESOLVE; 5419 sh->ref_regular = 1; 5420 sh->def_regular = 1; 5421 sh->ref_regular_nonweak = 1; 5422 sh->forced_local = 1; 5423 sh->non_elf = 0; 5424 } 5425 } 5426 } 5427 5428 /* We've now determined the sizes of the various dynamic sections. 5429 Allocate memory for them. */ 5430 relocs = FALSE; 5431 for (s = htab->elf.dynobj->sections; s != NULL; s = s->next) 5432 { 5433 bfd_boolean strip_section = TRUE; 5434 5435 if ((s->flags & SEC_LINKER_CREATED) == 0) 5436 continue; 5437 5438 if (s == htab->plt 5439 || s == htab->glink 5440 || s == htab->got 5441 || s == htab->sgotplt 5442 || s == htab->sbss 5443 || s == htab->dynbss 5444 || s == htab->dynsbss) 5445 { 5446 /* We'd like to strip these sections if they aren't needed, but if 5447 we've exported dynamic symbols from them we must leave them. 5448 It's too late to tell BFD to get rid of the symbols. */ 5449 if ((s == htab->plt || s == htab->got) && htab->elf.hplt != NULL) 5450 strip_section = FALSE; 5451 /* Strip this section if we don't need it; see the 5452 comment below. */ 5453 } 5454 else if (s == htab->sdata[0].section 5455 || s == htab->sdata[1].section) 5456 { 5457 /* Strip these too. */ 5458 } 5459 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 5460 { 5461 if (s->size != 0) 5462 { 5463 /* Remember whether there are any relocation sections. */ 5464 relocs = TRUE; 5465 5466 /* We use the reloc_count field as a counter if we need 5467 to copy relocs into the output file. */ 5468 s->reloc_count = 0; 5469 } 5470 } 5471 else 5472 { 5473 /* It's not one of our sections, so don't allocate space. */ 5474 continue; 5475 } 5476 5477 if (s->size == 0 && strip_section) 5478 { 5479 /* If we don't need this section, strip it from the 5480 output file. This is mostly to handle .rela.bss and 5481 .rela.plt. We must create both sections in 5482 create_dynamic_sections, because they must be created 5483 before the linker maps input sections to output 5484 sections. The linker does that before 5485 adjust_dynamic_symbol is called, and it is that 5486 function which decides whether anything needs to go 5487 into these sections. */ 5488 s->flags |= SEC_EXCLUDE; 5489 continue; 5490 } 5491 5492 if ((s->flags & SEC_HAS_CONTENTS) == 0) 5493 continue; 5494 5495 /* Allocate memory for the section contents. */ 5496 s->contents = bfd_zalloc (htab->elf.dynobj, s->size); 5497 if (s->contents == NULL) 5498 return FALSE; 5499 } 5500 5501 if (htab->elf.dynamic_sections_created) 5502 { 5503 /* Add some entries to the .dynamic section. We fill in the 5504 values later, in ppc_elf_finish_dynamic_sections, but we 5505 must add the entries now so that we get the correct size for 5506 the .dynamic section. The DT_DEBUG entry is filled in by the 5507 dynamic linker and used by the debugger. */ 5508 #define add_dynamic_entry(TAG, VAL) \ 5509 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 5510 5511 if (info->executable) 5512 { 5513 if (!add_dynamic_entry (DT_DEBUG, 0)) 5514 return FALSE; 5515 } 5516 5517 if (htab->plt != NULL && htab->plt->size != 0) 5518 { 5519 if (!add_dynamic_entry (DT_PLTGOT, 0) 5520 || !add_dynamic_entry (DT_PLTRELSZ, 0) 5521 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 5522 || !add_dynamic_entry (DT_JMPREL, 0)) 5523 return FALSE; 5524 } 5525 5526 if (htab->glink != NULL && htab->glink->size != 0) 5527 { 5528 if (!add_dynamic_entry (DT_PPC_GOT, 0)) 5529 return FALSE; 5530 } 5531 5532 if (relocs) 5533 { 5534 if (!add_dynamic_entry (DT_RELA, 0) 5535 || !add_dynamic_entry (DT_RELASZ, 0) 5536 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 5537 return FALSE; 5538 } 5539 5540 /* If any dynamic relocs apply to a read-only section, then we 5541 need a DT_TEXTREL entry. */ 5542 if ((info->flags & DF_TEXTREL) == 0) 5543 elf_link_hash_traverse (elf_hash_table (info), maybe_set_textrel, 5544 info); 5545 5546 if ((info->flags & DF_TEXTREL) != 0) 5547 { 5548 if (!add_dynamic_entry (DT_TEXTREL, 0)) 5549 return FALSE; 5550 } 5551 if (htab->is_vxworks 5552 && !elf_vxworks_add_dynamic_entries (output_bfd, info)) 5553 return FALSE; 5554 } 5555 #undef add_dynamic_entry 5556 5557 return TRUE; 5558 } 5559 5560 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 5561 5562 static bfd_boolean 5563 ppc_elf_hash_symbol (struct elf_link_hash_entry *h) 5564 { 5565 if (h->plt.plist != NULL 5566 && !h->def_regular 5567 && (!h->pointer_equality_needed 5568 || !h->ref_regular_nonweak)) 5569 return FALSE; 5570 5571 return _bfd_elf_hash_symbol (h); 5572 } 5573 5574 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0])) 5575 5576 static const int shared_stub_entry[] = 5577 { 5578 0x7c0802a6, /* mflr 0 */ 5579 0x429f0005, /* bcl 20, 31, .Lxxx */ 5580 0x7d6802a6, /* mflr 11 */ 5581 0x3d6b0000, /* addis 11, 11, (xxx-.Lxxx)@ha */ 5582 0x396b0018, /* addi 11, 11, (xxx-.Lxxx)@l */ 5583 0x7c0803a6, /* mtlr 0 */ 5584 0x7d6903a6, /* mtctr 11 */ 5585 0x4e800420, /* bctr */ 5586 }; 5587 5588 static const int stub_entry[] = 5589 { 5590 0x3d600000, /* lis 11,xxx@ha */ 5591 0x396b0000, /* addi 11,11,xxx@l */ 5592 0x7d6903a6, /* mtctr 11 */ 5593 0x4e800420, /* bctr */ 5594 }; 5595 5596 static bfd_boolean 5597 ppc_elf_relax_section (bfd *abfd, 5598 asection *isec, 5599 struct bfd_link_info *link_info, 5600 bfd_boolean *again) 5601 { 5602 struct one_fixup 5603 { 5604 struct one_fixup *next; 5605 asection *tsec; 5606 bfd_vma toff; 5607 bfd_vma trampoff; 5608 }; 5609 5610 Elf_Internal_Shdr *symtab_hdr; 5611 bfd_byte *contents = NULL; 5612 Elf_Internal_Sym *isymbuf = NULL; 5613 Elf_Internal_Rela *internal_relocs = NULL; 5614 Elf_Internal_Rela *irel, *irelend; 5615 struct one_fixup *fixups = NULL; 5616 unsigned changes = 0; 5617 struct ppc_elf_link_hash_table *htab; 5618 bfd_size_type trampoff; 5619 asection *got2; 5620 5621 *again = FALSE; 5622 5623 /* Nothing to do if there are no relocations, and no need to do 5624 anything with non-alloc sections. */ 5625 if ((isec->flags & SEC_ALLOC) == 0 5626 || (isec->flags & SEC_RELOC) == 0 5627 || isec->reloc_count == 0) 5628 return TRUE; 5629 5630 trampoff = (isec->size + 3) & (bfd_vma) -4; 5631 /* Space for a branch around any trampolines. */ 5632 trampoff += 4; 5633 5634 symtab_hdr = &elf_symtab_hdr (abfd); 5635 5636 /* Get a copy of the native relocations. */ 5637 internal_relocs = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, 5638 link_info->keep_memory); 5639 if (internal_relocs == NULL) 5640 goto error_return; 5641 5642 htab = ppc_elf_hash_table (link_info); 5643 got2 = bfd_get_section_by_name (abfd, ".got2"); 5644 5645 irelend = internal_relocs + isec->reloc_count; 5646 for (irel = internal_relocs; irel < irelend; irel++) 5647 { 5648 unsigned long r_type = ELF32_R_TYPE (irel->r_info); 5649 bfd_vma symaddr, reladdr, toff, roff; 5650 asection *tsec; 5651 struct one_fixup *f; 5652 size_t insn_offset = 0; 5653 bfd_vma max_branch_offset, val; 5654 bfd_byte *hit_addr; 5655 unsigned long t0; 5656 unsigned char sym_type; 5657 5658 switch (r_type) 5659 { 5660 case R_PPC_REL24: 5661 case R_PPC_LOCAL24PC: 5662 case R_PPC_PLTREL24: 5663 max_branch_offset = 1 << 25; 5664 break; 5665 5666 case R_PPC_REL14: 5667 case R_PPC_REL14_BRTAKEN: 5668 case R_PPC_REL14_BRNTAKEN: 5669 max_branch_offset = 1 << 15; 5670 break; 5671 5672 default: 5673 continue; 5674 } 5675 5676 /* Get the value of the symbol referred to by the reloc. */ 5677 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 5678 { 5679 /* A local symbol. */ 5680 Elf_Internal_Sym *isym; 5681 5682 /* Read this BFD's local symbols. */ 5683 if (isymbuf == NULL) 5684 { 5685 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 5686 if (isymbuf == NULL) 5687 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 5688 symtab_hdr->sh_info, 0, 5689 NULL, NULL, NULL); 5690 if (isymbuf == 0) 5691 goto error_return; 5692 } 5693 isym = isymbuf + ELF32_R_SYM (irel->r_info); 5694 if (isym->st_shndx == SHN_UNDEF) 5695 continue; /* We can't do anything with undefined symbols. */ 5696 else if (isym->st_shndx == SHN_ABS) 5697 tsec = bfd_abs_section_ptr; 5698 else if (isym->st_shndx == SHN_COMMON) 5699 tsec = bfd_com_section_ptr; 5700 else 5701 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 5702 5703 toff = isym->st_value; 5704 sym_type = ELF_ST_TYPE (isym->st_info); 5705 } 5706 else 5707 { 5708 /* Global symbol handling. */ 5709 unsigned long indx; 5710 struct elf_link_hash_entry *h; 5711 5712 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 5713 h = elf_sym_hashes (abfd)[indx]; 5714 5715 while (h->root.type == bfd_link_hash_indirect 5716 || h->root.type == bfd_link_hash_warning) 5717 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5718 5719 tsec = NULL; 5720 toff = 0; 5721 if (r_type == R_PPC_PLTREL24 5722 && htab->plt != NULL) 5723 { 5724 struct plt_entry *ent = find_plt_ent (h, got2, irel->r_addend); 5725 5726 if (ent != NULL) 5727 { 5728 if (htab->plt_type == PLT_NEW) 5729 { 5730 tsec = htab->glink; 5731 toff = ent->glink_offset; 5732 } 5733 else 5734 { 5735 tsec = htab->plt; 5736 toff = ent->plt.offset; 5737 } 5738 } 5739 } 5740 if (tsec != NULL) 5741 ; 5742 else if (h->root.type == bfd_link_hash_defined 5743 || h->root.type == bfd_link_hash_defweak) 5744 { 5745 tsec = h->root.u.def.section; 5746 toff = h->root.u.def.value; 5747 } 5748 else 5749 continue; 5750 5751 sym_type = h->type; 5752 } 5753 5754 /* If the branch and target are in the same section, you have 5755 no hope of adding stubs. We'll error out later should the 5756 branch overflow. */ 5757 if (tsec == isec) 5758 continue; 5759 5760 /* There probably isn't any reason to handle symbols in 5761 SEC_MERGE sections; SEC_MERGE doesn't seem a likely 5762 attribute for a code section, and we are only looking at 5763 branches. However, implement it correctly here as a 5764 reference for other target relax_section functions. */ 5765 if (0 && tsec->sec_info_type == ELF_INFO_TYPE_MERGE) 5766 { 5767 /* At this stage in linking, no SEC_MERGE symbol has been 5768 adjusted, so all references to such symbols need to be 5769 passed through _bfd_merged_section_offset. (Later, in 5770 relocate_section, all SEC_MERGE symbols *except* for 5771 section symbols have been adjusted.) 5772 5773 gas may reduce relocations against symbols in SEC_MERGE 5774 sections to a relocation against the section symbol when 5775 the original addend was zero. When the reloc is against 5776 a section symbol we should include the addend in the 5777 offset passed to _bfd_merged_section_offset, since the 5778 location of interest is the original symbol. On the 5779 other hand, an access to "sym+addend" where "sym" is not 5780 a section symbol should not include the addend; Such an 5781 access is presumed to be an offset from "sym"; The 5782 location of interest is just "sym". */ 5783 if (sym_type == STT_SECTION) 5784 toff += irel->r_addend; 5785 5786 toff = _bfd_merged_section_offset (abfd, &tsec, 5787 elf_section_data (tsec)->sec_info, 5788 toff); 5789 5790 if (sym_type != STT_SECTION) 5791 toff += irel->r_addend; 5792 } 5793 /* PLTREL24 addends are special. */ 5794 else if (r_type != R_PPC_PLTREL24) 5795 toff += irel->r_addend; 5796 5797 /* Attempted -shared link of non-pic code loses. */ 5798 if (tsec->output_section == NULL) 5799 continue; 5800 5801 symaddr = tsec->output_section->vma + tsec->output_offset + toff; 5802 5803 roff = irel->r_offset; 5804 reladdr = isec->output_section->vma + isec->output_offset + roff; 5805 5806 /* If the branch is in range, no need to do anything. */ 5807 if (symaddr - reladdr + max_branch_offset < 2 * max_branch_offset) 5808 continue; 5809 5810 /* Look for an existing fixup to this address. */ 5811 for (f = fixups; f ; f = f->next) 5812 if (f->tsec == tsec && f->toff == toff) 5813 break; 5814 5815 if (f == NULL) 5816 { 5817 size_t size; 5818 unsigned long stub_rtype; 5819 5820 val = trampoff - roff; 5821 if (val >= max_branch_offset) 5822 /* Oh dear, we can't reach a trampoline. Don't try to add 5823 one. We'll report an error later. */ 5824 continue; 5825 5826 if (link_info->shared) 5827 { 5828 size = 4 * ARRAY_SIZE (shared_stub_entry); 5829 insn_offset = 12; 5830 stub_rtype = R_PPC_RELAX32PC; 5831 } 5832 else 5833 { 5834 size = 4 * ARRAY_SIZE (stub_entry); 5835 insn_offset = 0; 5836 stub_rtype = R_PPC_RELAX32; 5837 } 5838 5839 if (R_PPC_RELAX32_PLT - R_PPC_RELAX32 5840 != R_PPC_RELAX32PC_PLT - R_PPC_RELAX32PC) 5841 abort (); 5842 if (tsec == htab->plt 5843 || tsec == htab->glink) 5844 stub_rtype += R_PPC_RELAX32_PLT - R_PPC_RELAX32; 5845 5846 /* Hijack the old relocation. Since we need two 5847 relocations for this use a "composite" reloc. */ 5848 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 5849 stub_rtype); 5850 irel->r_offset = trampoff + insn_offset; 5851 if (r_type == R_PPC_PLTREL24) 5852 irel->r_addend = 0; 5853 5854 /* Record the fixup so we don't do it again this section. */ 5855 f = bfd_malloc (sizeof (*f)); 5856 f->next = fixups; 5857 f->tsec = tsec; 5858 f->toff = toff; 5859 f->trampoff = trampoff; 5860 fixups = f; 5861 5862 trampoff += size; 5863 changes++; 5864 } 5865 else 5866 { 5867 val = f->trampoff - roff; 5868 if (val >= max_branch_offset) 5869 continue; 5870 5871 /* Nop out the reloc, since we're finalizing things here. */ 5872 irel->r_info = ELF32_R_INFO (0, R_PPC_NONE); 5873 } 5874 5875 /* Get the section contents. */ 5876 if (contents == NULL) 5877 { 5878 /* Get cached copy if it exists. */ 5879 if (elf_section_data (isec)->this_hdr.contents != NULL) 5880 contents = elf_section_data (isec)->this_hdr.contents; 5881 else 5882 { 5883 /* Go get them off disk. */ 5884 if (!bfd_malloc_and_get_section (abfd, isec, &contents)) 5885 goto error_return; 5886 } 5887 } 5888 5889 /* Fix up the existing branch to hit the trampoline. */ 5890 hit_addr = contents + roff; 5891 switch (r_type) 5892 { 5893 case R_PPC_REL24: 5894 case R_PPC_LOCAL24PC: 5895 case R_PPC_PLTREL24: 5896 t0 = bfd_get_32 (abfd, hit_addr); 5897 t0 &= ~0x3fffffc; 5898 t0 |= val & 0x3fffffc; 5899 bfd_put_32 (abfd, t0, hit_addr); 5900 break; 5901 5902 case R_PPC_REL14: 5903 case R_PPC_REL14_BRTAKEN: 5904 case R_PPC_REL14_BRNTAKEN: 5905 t0 = bfd_get_32 (abfd, hit_addr); 5906 t0 &= ~0xfffc; 5907 t0 |= val & 0xfffc; 5908 bfd_put_32 (abfd, t0, hit_addr); 5909 break; 5910 } 5911 } 5912 5913 /* Write out the trampolines. */ 5914 if (fixups != NULL) 5915 { 5916 const int *stub; 5917 bfd_byte *dest; 5918 bfd_vma val; 5919 int i, size; 5920 5921 do 5922 { 5923 struct one_fixup *f = fixups; 5924 fixups = fixups->next; 5925 free (f); 5926 } 5927 while (fixups); 5928 5929 contents = bfd_realloc_or_free (contents, trampoff); 5930 if (contents == NULL) 5931 goto error_return; 5932 5933 isec->size = (isec->size + 3) & (bfd_vma) -4; 5934 /* Branch around the trampolines. */ 5935 val = B + trampoff - isec->size; 5936 dest = contents + isec->size; 5937 isec->size = trampoff; 5938 bfd_put_32 (abfd, val, dest); 5939 dest += 4; 5940 5941 if (link_info->shared) 5942 { 5943 stub = shared_stub_entry; 5944 size = ARRAY_SIZE (shared_stub_entry); 5945 } 5946 else 5947 { 5948 stub = stub_entry; 5949 size = ARRAY_SIZE (stub_entry); 5950 } 5951 5952 i = 0; 5953 while (dest < contents + trampoff) 5954 { 5955 bfd_put_32 (abfd, stub[i], dest); 5956 i++; 5957 if (i == size) 5958 i = 0; 5959 dest += 4; 5960 } 5961 BFD_ASSERT (i == 0); 5962 } 5963 5964 if (isymbuf != NULL 5965 && symtab_hdr->contents != (unsigned char *) isymbuf) 5966 { 5967 if (! link_info->keep_memory) 5968 free (isymbuf); 5969 else 5970 { 5971 /* Cache the symbols for elf_link_input_bfd. */ 5972 symtab_hdr->contents = (unsigned char *) isymbuf; 5973 } 5974 } 5975 5976 if (contents != NULL 5977 && elf_section_data (isec)->this_hdr.contents != contents) 5978 { 5979 if (!changes && !link_info->keep_memory) 5980 free (contents); 5981 else 5982 { 5983 /* Cache the section contents for elf_link_input_bfd. */ 5984 elf_section_data (isec)->this_hdr.contents = contents; 5985 } 5986 } 5987 5988 if (changes != 0) 5989 { 5990 /* Append sufficient NOP relocs so we can write out relocation 5991 information for the trampolines. */ 5992 Elf_Internal_Rela *new_relocs = bfd_malloc ((changes + isec->reloc_count) 5993 * sizeof (*new_relocs)); 5994 unsigned ix; 5995 5996 if (!new_relocs) 5997 goto error_return; 5998 memcpy (new_relocs, internal_relocs, 5999 isec->reloc_count * sizeof (*new_relocs)); 6000 for (ix = changes; ix--;) 6001 { 6002 irel = new_relocs + ix + isec->reloc_count; 6003 6004 irel->r_info = ELF32_R_INFO (0, R_PPC_NONE); 6005 } 6006 if (internal_relocs != elf_section_data (isec)->relocs) 6007 free (internal_relocs); 6008 elf_section_data (isec)->relocs = new_relocs; 6009 isec->reloc_count += changes; 6010 elf_section_data (isec)->rel_hdr.sh_size 6011 += changes * elf_section_data (isec)->rel_hdr.sh_entsize; 6012 } 6013 else if (elf_section_data (isec)->relocs != internal_relocs) 6014 free (internal_relocs); 6015 6016 *again = changes != 0; 6017 return TRUE; 6018 6019 error_return: 6020 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 6021 free (isymbuf); 6022 if (contents != NULL 6023 && elf_section_data (isec)->this_hdr.contents != contents) 6024 free (contents); 6025 if (internal_relocs != NULL 6026 && elf_section_data (isec)->relocs != internal_relocs) 6027 free (internal_relocs); 6028 return FALSE; 6029 } 6030 6031 /* What to do when ld finds relocations against symbols defined in 6032 discarded sections. */ 6033 6034 static unsigned int 6035 ppc_elf_action_discarded (asection *sec) 6036 { 6037 if (strcmp (".fixup", sec->name) == 0) 6038 return 0; 6039 6040 if (strcmp (".got2", sec->name) == 0) 6041 return 0; 6042 6043 return _bfd_elf_default_action_discarded (sec); 6044 } 6045 6046 /* Fill in the address for a pointer generated in a linker section. */ 6047 6048 static bfd_vma 6049 elf_finish_pointer_linker_section (bfd *input_bfd, 6050 elf_linker_section_t *lsect, 6051 struct elf_link_hash_entry *h, 6052 bfd_vma relocation, 6053 const Elf_Internal_Rela *rel) 6054 { 6055 elf_linker_section_pointers_t *linker_section_ptr; 6056 6057 BFD_ASSERT (lsect != NULL); 6058 6059 if (h != NULL) 6060 { 6061 /* Handle global symbol. */ 6062 struct ppc_elf_link_hash_entry *eh; 6063 6064 eh = (struct ppc_elf_link_hash_entry *) h; 6065 BFD_ASSERT (eh->elf.def_regular); 6066 linker_section_ptr = eh->linker_section_pointer; 6067 } 6068 else 6069 { 6070 /* Handle local symbol. */ 6071 unsigned long r_symndx = ELF32_R_SYM (rel->r_info); 6072 6073 BFD_ASSERT (is_ppc_elf (input_bfd)); 6074 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL); 6075 linker_section_ptr = elf_local_ptr_offsets (input_bfd)[r_symndx]; 6076 } 6077 6078 linker_section_ptr = elf_find_pointer_linker_section (linker_section_ptr, 6079 rel->r_addend, 6080 lsect); 6081 BFD_ASSERT (linker_section_ptr != NULL); 6082 6083 /* Offset will always be a multiple of four, so use the bottom bit 6084 as a "written" flag. */ 6085 if ((linker_section_ptr->offset & 1) == 0) 6086 { 6087 bfd_put_32 (lsect->section->owner, 6088 relocation + linker_section_ptr->addend, 6089 lsect->section->contents + linker_section_ptr->offset); 6090 linker_section_ptr->offset += 1; 6091 } 6092 6093 relocation = (lsect->section->output_offset 6094 + linker_section_ptr->offset - 1 6095 - 0x8000); 6096 6097 #ifdef DEBUG 6098 fprintf (stderr, 6099 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n", 6100 lsect->name, (long) relocation, (long) relocation); 6101 #endif 6102 6103 /* Subtract out the addend, because it will get added back in by the normal 6104 processing. */ 6105 return relocation - linker_section_ptr->addend; 6106 } 6107 6108 /* The RELOCATE_SECTION function is called by the ELF backend linker 6109 to handle the relocations for a section. 6110 6111 The relocs are always passed as Rela structures; if the section 6112 actually uses Rel structures, the r_addend field will always be 6113 zero. 6114 6115 This function is responsible for adjust the section contents as 6116 necessary, and (if using Rela relocs and generating a 6117 relocatable output file) adjusting the reloc addend as 6118 necessary. 6119 6120 This function does not have to worry about setting the reloc 6121 address or the reloc symbol index. 6122 6123 LOCAL_SYMS is a pointer to the swapped in local symbols. 6124 6125 LOCAL_SECTIONS is an array giving the section in the input file 6126 corresponding to the st_shndx field of each local symbol. 6127 6128 The global hash table entry for the global symbols can be found 6129 via elf_sym_hashes (input_bfd). 6130 6131 When generating relocatable output, this function must handle 6132 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 6133 going to be the section symbol corresponding to the output 6134 section, which means that the addend must be adjusted 6135 accordingly. */ 6136 6137 static bfd_boolean 6138 ppc_elf_relocate_section (bfd *output_bfd, 6139 struct bfd_link_info *info, 6140 bfd *input_bfd, 6141 asection *input_section, 6142 bfd_byte *contents, 6143 Elf_Internal_Rela *relocs, 6144 Elf_Internal_Sym *local_syms, 6145 asection **local_sections) 6146 { 6147 Elf_Internal_Shdr *symtab_hdr; 6148 struct elf_link_hash_entry **sym_hashes; 6149 struct ppc_elf_link_hash_table *htab; 6150 Elf_Internal_Rela *rel; 6151 Elf_Internal_Rela *relend; 6152 Elf_Internal_Rela outrel; 6153 bfd_byte *loc; 6154 asection *got2, *sreloc = NULL; 6155 bfd_vma *local_got_offsets; 6156 bfd_boolean ret = TRUE; 6157 bfd_vma d_offset = (bfd_big_endian (output_bfd) ? 2 : 0); 6158 bfd_boolean is_vxworks_tls; 6159 6160 #ifdef DEBUG 6161 _bfd_error_handler ("ppc_elf_relocate_section called for %B section %A, " 6162 "%ld relocations%s", 6163 input_bfd, input_section, 6164 (long) input_section->reloc_count, 6165 (info->relocatable) ? " (relocatable)" : ""); 6166 #endif 6167 6168 got2 = bfd_get_section_by_name (input_bfd, ".got2"); 6169 6170 /* Initialize howto table if not already done. */ 6171 if (!ppc_elf_howto_table[R_PPC_ADDR32]) 6172 ppc_elf_howto_init (); 6173 6174 htab = ppc_elf_hash_table (info); 6175 local_got_offsets = elf_local_got_offsets (input_bfd); 6176 symtab_hdr = &elf_symtab_hdr (input_bfd); 6177 sym_hashes = elf_sym_hashes (input_bfd); 6178 /* We have to handle relocations in vxworks .tls_vars sections 6179 specially, because the dynamic loader is 'weird'. */ 6180 is_vxworks_tls = (htab->is_vxworks && info->shared 6181 && !strcmp (input_section->output_section->name, 6182 ".tls_vars")); 6183 rel = relocs; 6184 relend = relocs + input_section->reloc_count; 6185 for (; rel < relend; rel++) 6186 { 6187 enum elf_ppc_reloc_type r_type; 6188 bfd_vma addend; 6189 bfd_reloc_status_type r; 6190 Elf_Internal_Sym *sym; 6191 asection *sec; 6192 struct elf_link_hash_entry *h; 6193 const char *sym_name; 6194 reloc_howto_type *howto; 6195 unsigned long r_symndx; 6196 bfd_vma relocation; 6197 bfd_vma branch_bit, insn, from; 6198 bfd_boolean unresolved_reloc; 6199 bfd_boolean warned; 6200 unsigned int tls_type, tls_mask, tls_gd; 6201 6202 r_type = ELF32_R_TYPE (rel->r_info); 6203 sym = NULL; 6204 sec = NULL; 6205 h = NULL; 6206 unresolved_reloc = FALSE; 6207 warned = FALSE; 6208 r_symndx = ELF32_R_SYM (rel->r_info); 6209 6210 if (r_symndx < symtab_hdr->sh_info) 6211 { 6212 sym = local_syms + r_symndx; 6213 sec = local_sections[r_symndx]; 6214 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, sec); 6215 6216 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 6217 } 6218 else 6219 { 6220 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 6221 r_symndx, symtab_hdr, sym_hashes, 6222 h, sec, relocation, 6223 unresolved_reloc, warned); 6224 6225 sym_name = h->root.root.string; 6226 } 6227 6228 if (sec != NULL && elf_discarded_section (sec)) 6229 { 6230 /* For relocs against symbols from removed linkonce sections, 6231 or sections discarded by a linker script, we just want the 6232 section contents zeroed. Avoid any special processing. */ 6233 howto = NULL; 6234 if (r_type < R_PPC_max) 6235 howto = ppc_elf_howto_table[r_type]; 6236 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 6237 rel->r_info = 0; 6238 rel->r_addend = 0; 6239 continue; 6240 } 6241 6242 if (info->relocatable) 6243 { 6244 if (got2 != NULL 6245 && r_type == R_PPC_PLTREL24 6246 && rel->r_addend >= 32768) 6247 { 6248 /* R_PPC_PLTREL24 is rather special. If non-zero, the 6249 addend specifies the GOT pointer offset within .got2. */ 6250 rel->r_addend += got2->output_offset; 6251 } 6252 continue; 6253 } 6254 6255 /* TLS optimizations. Replace instruction sequences and relocs 6256 based on information we collected in tls_optimize. We edit 6257 RELOCS so that --emit-relocs will output something sensible 6258 for the final instruction stream. */ 6259 tls_mask = 0; 6260 tls_gd = 0; 6261 if (IS_PPC_TLS_RELOC (r_type)) 6262 { 6263 if (h != NULL) 6264 tls_mask = ((struct ppc_elf_link_hash_entry *) h)->tls_mask; 6265 else if (local_got_offsets != NULL) 6266 { 6267 char *lgot_masks; 6268 lgot_masks = (char *) (local_got_offsets + symtab_hdr->sh_info); 6269 tls_mask = lgot_masks[r_symndx]; 6270 } 6271 } 6272 6273 /* Ensure reloc mapping code below stays sane. */ 6274 if ((R_PPC_GOT_TLSLD16 & 3) != (R_PPC_GOT_TLSGD16 & 3) 6275 || (R_PPC_GOT_TLSLD16_LO & 3) != (R_PPC_GOT_TLSGD16_LO & 3) 6276 || (R_PPC_GOT_TLSLD16_HI & 3) != (R_PPC_GOT_TLSGD16_HI & 3) 6277 || (R_PPC_GOT_TLSLD16_HA & 3) != (R_PPC_GOT_TLSGD16_HA & 3) 6278 || (R_PPC_GOT_TLSLD16 & 3) != (R_PPC_GOT_TPREL16 & 3) 6279 || (R_PPC_GOT_TLSLD16_LO & 3) != (R_PPC_GOT_TPREL16_LO & 3) 6280 || (R_PPC_GOT_TLSLD16_HI & 3) != (R_PPC_GOT_TPREL16_HI & 3) 6281 || (R_PPC_GOT_TLSLD16_HA & 3) != (R_PPC_GOT_TPREL16_HA & 3)) 6282 abort (); 6283 switch (r_type) 6284 { 6285 default: 6286 break; 6287 6288 case R_PPC_GOT_TPREL16: 6289 case R_PPC_GOT_TPREL16_LO: 6290 if (tls_mask != 0 6291 && (tls_mask & TLS_TPREL) == 0) 6292 { 6293 bfd_vma insn; 6294 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - d_offset); 6295 insn &= 31 << 21; 6296 insn |= 0x3c020000; /* addis 0,2,0 */ 6297 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - d_offset); 6298 r_type = R_PPC_TPREL16_HA; 6299 rel->r_info = ELF32_R_INFO (r_symndx, r_type); 6300 } 6301 break; 6302 6303 case R_PPC_TLS: 6304 if (tls_mask != 0 6305 && (tls_mask & TLS_TPREL) == 0) 6306 { 6307 bfd_vma insn, rtra; 6308 insn = bfd_get_32 (output_bfd, contents + rel->r_offset); 6309 if ((insn & ((31 << 26) | (31 << 11))) 6310 == ((31 << 26) | (2 << 11))) 6311 rtra = insn & ((1 << 26) - (1 << 16)); 6312 else if ((insn & ((31 << 26) | (31 << 16))) 6313 == ((31 << 26) | (2 << 16))) 6314 rtra = (insn & (31 << 21)) | ((insn & (31 << 11)) << 5); 6315 else 6316 abort (); 6317 if ((insn & ((1 << 11) - (1 << 1))) == 266 << 1) 6318 /* add -> addi. */ 6319 insn = 14 << 26; 6320 else if ((insn & (31 << 1)) == 23 << 1 6321 && ((insn & (31 << 6)) < 14 << 6 6322 || ((insn & (31 << 6)) >= 16 << 6 6323 && (insn & (31 << 6)) < 24 << 6))) 6324 /* load and store indexed -> dform. */ 6325 insn = (32 | ((insn >> 6) & 31)) << 26; 6326 else if ((insn & (31 << 1)) == 21 << 1 6327 && (insn & (0x1a << 6)) == 0) 6328 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */ 6329 insn = (((58 | ((insn >> 6) & 4)) << 26) 6330 | ((insn >> 6) & 1)); 6331 else if ((insn & (31 << 1)) == 21 << 1 6332 && (insn & ((1 << 11) - (1 << 1))) == 341 << 1) 6333 /* lwax -> lwa. */ 6334 insn = (58 << 26) | 2; 6335 else 6336 abort (); 6337 insn |= rtra; 6338 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 6339 r_type = R_PPC_TPREL16_LO; 6340 rel->r_info = ELF32_R_INFO (r_symndx, r_type); 6341 6342 /* Was PPC_TLS which sits on insn boundary, now 6343 PPC_TPREL16_LO which is at low-order half-word. */ 6344 rel->r_offset += d_offset; 6345 } 6346 break; 6347 6348 case R_PPC_GOT_TLSGD16_HI: 6349 case R_PPC_GOT_TLSGD16_HA: 6350 tls_gd = TLS_TPRELGD; 6351 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 6352 goto tls_gdld_hi; 6353 break; 6354 6355 case R_PPC_GOT_TLSLD16_HI: 6356 case R_PPC_GOT_TLSLD16_HA: 6357 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 6358 { 6359 tls_gdld_hi: 6360 if ((tls_mask & tls_gd) != 0) 6361 r_type = (((r_type - (R_PPC_GOT_TLSGD16 & 3)) & 3) 6362 + R_PPC_GOT_TPREL16); 6363 else 6364 { 6365 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 6366 rel->r_offset -= d_offset; 6367 r_type = R_PPC_NONE; 6368 } 6369 rel->r_info = ELF32_R_INFO (r_symndx, r_type); 6370 } 6371 break; 6372 6373 case R_PPC_GOT_TLSGD16: 6374 case R_PPC_GOT_TLSGD16_LO: 6375 tls_gd = TLS_TPRELGD; 6376 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 6377 goto tls_ldgd_opt; 6378 break; 6379 6380 case R_PPC_GOT_TLSLD16: 6381 case R_PPC_GOT_TLSLD16_LO: 6382 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 6383 { 6384 unsigned int insn1, insn2; 6385 bfd_vma offset; 6386 6387 tls_ldgd_opt: 6388 offset = rel[1].r_offset; 6389 if ((tls_mask & tls_gd) != 0) 6390 { 6391 /* IE */ 6392 insn1 = bfd_get_32 (output_bfd, 6393 contents + rel->r_offset - d_offset); 6394 insn1 &= (1 << 26) - 1; 6395 insn1 |= 32 << 26; /* lwz */ 6396 insn2 = 0x7c631214; /* add 3,3,2 */ 6397 rel[1].r_info 6398 = ELF32_R_INFO (ELF32_R_SYM (rel[1].r_info), R_PPC_NONE); 6399 r_type = (((r_type - (R_PPC_GOT_TLSGD16 & 3)) & 3) 6400 + R_PPC_GOT_TPREL16); 6401 rel->r_info = ELF32_R_INFO (r_symndx, r_type); 6402 } 6403 else 6404 { 6405 /* LE */ 6406 insn1 = 0x3c620000; /* addis 3,2,0 */ 6407 insn2 = 0x38630000; /* addi 3,3,0 */ 6408 if (tls_gd == 0) 6409 { 6410 /* Was an LD reloc. */ 6411 for (r_symndx = 0; 6412 r_symndx < symtab_hdr->sh_info; 6413 r_symndx++) 6414 if (local_sections[r_symndx] == sec) 6415 break; 6416 if (r_symndx >= symtab_hdr->sh_info) 6417 r_symndx = 0; 6418 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 6419 if (r_symndx != 0) 6420 rel->r_addend -= (local_syms[r_symndx].st_value 6421 + sec->output_offset 6422 + sec->output_section->vma); 6423 } 6424 r_type = R_PPC_TPREL16_HA; 6425 rel->r_info = ELF32_R_INFO (r_symndx, r_type); 6426 rel[1].r_info = ELF32_R_INFO (r_symndx, 6427 R_PPC_TPREL16_LO); 6428 rel[1].r_offset += d_offset; 6429 rel[1].r_addend = rel->r_addend; 6430 } 6431 bfd_put_32 (output_bfd, insn1, 6432 contents + rel->r_offset - d_offset); 6433 bfd_put_32 (output_bfd, insn2, contents + offset); 6434 if (tls_gd == 0) 6435 { 6436 /* We changed the symbol on an LD reloc. Start over 6437 in order to get h, sym, sec etc. right. */ 6438 rel--; 6439 continue; 6440 } 6441 } 6442 break; 6443 } 6444 6445 /* Handle other relocations that tweak non-addend part of insn. */ 6446 branch_bit = 0; 6447 switch (r_type) 6448 { 6449 default: 6450 break; 6451 6452 /* Branch taken prediction relocations. */ 6453 case R_PPC_ADDR14_BRTAKEN: 6454 case R_PPC_REL14_BRTAKEN: 6455 branch_bit = BRANCH_PREDICT_BIT; 6456 /* Fall thru */ 6457 6458 /* Branch not taken prediction relocations. */ 6459 case R_PPC_ADDR14_BRNTAKEN: 6460 case R_PPC_REL14_BRNTAKEN: 6461 insn = bfd_get_32 (output_bfd, contents + rel->r_offset); 6462 insn &= ~BRANCH_PREDICT_BIT; 6463 insn |= branch_bit; 6464 6465 from = (rel->r_offset 6466 + input_section->output_offset 6467 + input_section->output_section->vma); 6468 6469 /* Invert 'y' bit if not the default. */ 6470 if ((bfd_signed_vma) (relocation + rel->r_addend - from) < 0) 6471 insn ^= BRANCH_PREDICT_BIT; 6472 6473 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 6474 break; 6475 } 6476 6477 addend = rel->r_addend; 6478 tls_type = 0; 6479 howto = NULL; 6480 if (r_type < R_PPC_max) 6481 howto = ppc_elf_howto_table[r_type]; 6482 switch (r_type) 6483 { 6484 default: 6485 (*_bfd_error_handler) 6486 (_("%B: unknown relocation type %d for symbol %s"), 6487 input_bfd, (int) r_type, sym_name); 6488 6489 bfd_set_error (bfd_error_bad_value); 6490 ret = FALSE; 6491 continue; 6492 6493 case R_PPC_NONE: 6494 case R_PPC_TLS: 6495 case R_PPC_EMB_MRKREF: 6496 case R_PPC_GNU_VTINHERIT: 6497 case R_PPC_GNU_VTENTRY: 6498 continue; 6499 6500 /* GOT16 relocations. Like an ADDR16 using the symbol's 6501 address in the GOT as relocation value instead of the 6502 symbol's value itself. Also, create a GOT entry for the 6503 symbol and put the symbol value there. */ 6504 case R_PPC_GOT_TLSGD16: 6505 case R_PPC_GOT_TLSGD16_LO: 6506 case R_PPC_GOT_TLSGD16_HI: 6507 case R_PPC_GOT_TLSGD16_HA: 6508 tls_type = TLS_TLS | TLS_GD; 6509 goto dogot; 6510 6511 case R_PPC_GOT_TLSLD16: 6512 case R_PPC_GOT_TLSLD16_LO: 6513 case R_PPC_GOT_TLSLD16_HI: 6514 case R_PPC_GOT_TLSLD16_HA: 6515 tls_type = TLS_TLS | TLS_LD; 6516 goto dogot; 6517 6518 case R_PPC_GOT_TPREL16: 6519 case R_PPC_GOT_TPREL16_LO: 6520 case R_PPC_GOT_TPREL16_HI: 6521 case R_PPC_GOT_TPREL16_HA: 6522 tls_type = TLS_TLS | TLS_TPREL; 6523 goto dogot; 6524 6525 case R_PPC_GOT_DTPREL16: 6526 case R_PPC_GOT_DTPREL16_LO: 6527 case R_PPC_GOT_DTPREL16_HI: 6528 case R_PPC_GOT_DTPREL16_HA: 6529 tls_type = TLS_TLS | TLS_DTPREL; 6530 goto dogot; 6531 6532 case R_PPC_GOT16: 6533 case R_PPC_GOT16_LO: 6534 case R_PPC_GOT16_HI: 6535 case R_PPC_GOT16_HA: 6536 dogot: 6537 { 6538 /* Relocation is to the entry for this symbol in the global 6539 offset table. */ 6540 bfd_vma off; 6541 bfd_vma *offp; 6542 unsigned long indx; 6543 6544 if (htab->got == NULL) 6545 abort (); 6546 6547 indx = 0; 6548 if (tls_type == (TLS_TLS | TLS_LD) 6549 && (h == NULL 6550 || !h->def_dynamic)) 6551 offp = &htab->tlsld_got.offset; 6552 else if (h != NULL) 6553 { 6554 bfd_boolean dyn; 6555 dyn = htab->elf.dynamic_sections_created; 6556 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 6557 || (info->shared 6558 && SYMBOL_REFERENCES_LOCAL (info, h))) 6559 /* This is actually a static link, or it is a 6560 -Bsymbolic link and the symbol is defined 6561 locally, or the symbol was forced to be local 6562 because of a version file. */ 6563 ; 6564 else 6565 { 6566 indx = h->dynindx; 6567 unresolved_reloc = FALSE; 6568 } 6569 offp = &h->got.offset; 6570 } 6571 else 6572 { 6573 if (local_got_offsets == NULL) 6574 abort (); 6575 offp = &local_got_offsets[r_symndx]; 6576 } 6577 6578 /* The offset must always be a multiple of 4. We use the 6579 least significant bit to record whether we have already 6580 processed this entry. */ 6581 off = *offp; 6582 if ((off & 1) != 0) 6583 off &= ~1; 6584 else 6585 { 6586 unsigned int tls_m = (tls_mask 6587 & (TLS_LD | TLS_GD | TLS_DTPREL 6588 | TLS_TPREL | TLS_TPRELGD)); 6589 6590 if (offp == &htab->tlsld_got.offset) 6591 tls_m = TLS_LD; 6592 else if (h == NULL 6593 || !h->def_dynamic) 6594 tls_m &= ~TLS_LD; 6595 6596 /* We might have multiple got entries for this sym. 6597 Initialize them all. */ 6598 do 6599 { 6600 int tls_ty = 0; 6601 6602 if ((tls_m & TLS_LD) != 0) 6603 { 6604 tls_ty = TLS_TLS | TLS_LD; 6605 tls_m &= ~TLS_LD; 6606 } 6607 else if ((tls_m & TLS_GD) != 0) 6608 { 6609 tls_ty = TLS_TLS | TLS_GD; 6610 tls_m &= ~TLS_GD; 6611 } 6612 else if ((tls_m & TLS_DTPREL) != 0) 6613 { 6614 tls_ty = TLS_TLS | TLS_DTPREL; 6615 tls_m &= ~TLS_DTPREL; 6616 } 6617 else if ((tls_m & (TLS_TPREL | TLS_TPRELGD)) != 0) 6618 { 6619 tls_ty = TLS_TLS | TLS_TPREL; 6620 tls_m = 0; 6621 } 6622 6623 /* Generate relocs for the dynamic linker. */ 6624 if ((info->shared || indx != 0) 6625 && (offp == &htab->tlsld_got.offset 6626 || h == NULL 6627 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 6628 || h->root.type != bfd_link_hash_undefweak)) 6629 { 6630 outrel.r_offset = (htab->got->output_section->vma 6631 + htab->got->output_offset 6632 + off); 6633 outrel.r_addend = 0; 6634 if (tls_ty & (TLS_LD | TLS_GD)) 6635 { 6636 outrel.r_info = ELF32_R_INFO (indx, R_PPC_DTPMOD32); 6637 if (tls_ty == (TLS_TLS | TLS_GD)) 6638 { 6639 loc = htab->relgot->contents; 6640 loc += (htab->relgot->reloc_count++ 6641 * sizeof (Elf32_External_Rela)); 6642 bfd_elf32_swap_reloca_out (output_bfd, 6643 &outrel, loc); 6644 outrel.r_offset += 4; 6645 outrel.r_info 6646 = ELF32_R_INFO (indx, R_PPC_DTPREL32); 6647 } 6648 } 6649 else if (tls_ty == (TLS_TLS | TLS_DTPREL)) 6650 outrel.r_info = ELF32_R_INFO (indx, R_PPC_DTPREL32); 6651 else if (tls_ty == (TLS_TLS | TLS_TPREL)) 6652 outrel.r_info = ELF32_R_INFO (indx, R_PPC_TPREL32); 6653 else if (indx == 0) 6654 outrel.r_info = ELF32_R_INFO (indx, R_PPC_RELATIVE); 6655 else 6656 outrel.r_info = ELF32_R_INFO (indx, R_PPC_GLOB_DAT); 6657 if (indx == 0 && tls_ty != (TLS_TLS | TLS_LD)) 6658 { 6659 outrel.r_addend += relocation; 6660 if (tls_ty & (TLS_GD | TLS_DTPREL | TLS_TPREL)) 6661 outrel.r_addend -= htab->elf.tls_sec->vma; 6662 } 6663 loc = htab->relgot->contents; 6664 loc += (htab->relgot->reloc_count++ 6665 * sizeof (Elf32_External_Rela)); 6666 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 6667 } 6668 6669 /* Init the .got section contents if we're not 6670 emitting a reloc. */ 6671 else 6672 { 6673 bfd_vma value = relocation; 6674 6675 if (tls_ty == (TLS_TLS | TLS_LD)) 6676 value = 1; 6677 else if (tls_ty != 0) 6678 { 6679 value -= htab->elf.tls_sec->vma + DTP_OFFSET; 6680 if (tls_ty == (TLS_TLS | TLS_TPREL)) 6681 value += DTP_OFFSET - TP_OFFSET; 6682 6683 if (tls_ty == (TLS_TLS | TLS_GD)) 6684 { 6685 bfd_put_32 (output_bfd, value, 6686 htab->got->contents + off + 4); 6687 value = 1; 6688 } 6689 } 6690 bfd_put_32 (output_bfd, value, 6691 htab->got->contents + off); 6692 } 6693 6694 off += 4; 6695 if (tls_ty & (TLS_LD | TLS_GD)) 6696 off += 4; 6697 } 6698 while (tls_m != 0); 6699 6700 off = *offp; 6701 *offp = off | 1; 6702 } 6703 6704 if (off >= (bfd_vma) -2) 6705 abort (); 6706 6707 if ((tls_type & TLS_TLS) != 0) 6708 { 6709 if (tls_type != (TLS_TLS | TLS_LD)) 6710 { 6711 if ((tls_mask & TLS_LD) != 0 6712 && !(h == NULL 6713 || !h->def_dynamic)) 6714 off += 8; 6715 if (tls_type != (TLS_TLS | TLS_GD)) 6716 { 6717 if ((tls_mask & TLS_GD) != 0) 6718 off += 8; 6719 if (tls_type != (TLS_TLS | TLS_DTPREL)) 6720 { 6721 if ((tls_mask & TLS_DTPREL) != 0) 6722 off += 4; 6723 } 6724 } 6725 } 6726 } 6727 6728 relocation = (htab->got->output_section->vma 6729 + htab->got->output_offset 6730 + off 6731 - SYM_VAL (htab->elf.hgot)); 6732 6733 /* Addends on got relocations don't make much sense. 6734 x+off@got is actually x@got+off, and since the got is 6735 generated by a hash table traversal, the value in the 6736 got at entry m+n bears little relation to the entry m. */ 6737 if (addend != 0) 6738 (*_bfd_error_handler) 6739 (_("%B(%A+0x%lx): non-zero addend on %s reloc against `%s'"), 6740 input_bfd, 6741 input_section, 6742 (long) rel->r_offset, 6743 howto->name, 6744 sym_name); 6745 } 6746 break; 6747 6748 /* Relocations that need no special processing. */ 6749 case R_PPC_LOCAL24PC: 6750 /* It makes no sense to point a local relocation 6751 at a symbol not in this object. */ 6752 if (unresolved_reloc) 6753 { 6754 if (! (*info->callbacks->undefined_symbol) (info, 6755 h->root.root.string, 6756 input_bfd, 6757 input_section, 6758 rel->r_offset, 6759 TRUE)) 6760 return FALSE; 6761 continue; 6762 } 6763 break; 6764 6765 case R_PPC_DTPREL16: 6766 case R_PPC_DTPREL16_LO: 6767 case R_PPC_DTPREL16_HI: 6768 case R_PPC_DTPREL16_HA: 6769 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 6770 break; 6771 6772 /* Relocations that may need to be propagated if this is a shared 6773 object. */ 6774 case R_PPC_TPREL16: 6775 case R_PPC_TPREL16_LO: 6776 case R_PPC_TPREL16_HI: 6777 case R_PPC_TPREL16_HA: 6778 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 6779 /* The TPREL16 relocs shouldn't really be used in shared 6780 libs as they will result in DT_TEXTREL being set, but 6781 support them anyway. */ 6782 goto dodyn; 6783 6784 case R_PPC_TPREL32: 6785 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 6786 goto dodyn; 6787 6788 case R_PPC_DTPREL32: 6789 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 6790 goto dodyn; 6791 6792 case R_PPC_DTPMOD32: 6793 relocation = 1; 6794 addend = 0; 6795 goto dodyn; 6796 6797 case R_PPC_REL16: 6798 case R_PPC_REL16_LO: 6799 case R_PPC_REL16_HI: 6800 case R_PPC_REL16_HA: 6801 break; 6802 6803 case R_PPC_REL32: 6804 if (h == NULL || h == htab->elf.hgot) 6805 break; 6806 /* fall through */ 6807 6808 case R_PPC_ADDR32: 6809 case R_PPC_ADDR16: 6810 case R_PPC_ADDR16_LO: 6811 case R_PPC_ADDR16_HI: 6812 case R_PPC_ADDR16_HA: 6813 case R_PPC_UADDR32: 6814 case R_PPC_UADDR16: 6815 goto dodyn; 6816 6817 case R_PPC_REL24: 6818 case R_PPC_REL14: 6819 case R_PPC_REL14_BRTAKEN: 6820 case R_PPC_REL14_BRNTAKEN: 6821 /* If these relocations are not to a named symbol, they can be 6822 handled right here, no need to bother the dynamic linker. */ 6823 if (SYMBOL_CALLS_LOCAL (info, h) 6824 || h == htab->elf.hgot) 6825 break; 6826 /* fall through */ 6827 6828 case R_PPC_ADDR24: 6829 case R_PPC_ADDR14: 6830 case R_PPC_ADDR14_BRTAKEN: 6831 case R_PPC_ADDR14_BRNTAKEN: 6832 if (h != NULL && !info->shared) 6833 break; 6834 /* fall through */ 6835 6836 dodyn: 6837 if ((input_section->flags & SEC_ALLOC) == 0 6838 || is_vxworks_tls) 6839 break; 6840 6841 if ((info->shared 6842 && !(h != NULL 6843 && ((h->root.type == bfd_link_hash_undefined 6844 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN 6845 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)) 6846 || (h->root.type == bfd_link_hash_undefweak 6847 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT))) 6848 && (must_be_dyn_reloc (info, r_type) 6849 || !SYMBOL_CALLS_LOCAL (info, h))) 6850 || (ELIMINATE_COPY_RELOCS 6851 && !info->shared 6852 && h != NULL 6853 && h->dynindx != -1 6854 && !h->non_got_ref 6855 && !h->def_regular)) 6856 { 6857 int skip; 6858 6859 #ifdef DEBUG 6860 fprintf (stderr, "ppc_elf_relocate_section needs to " 6861 "create relocation for %s\n", 6862 (h && h->root.root.string 6863 ? h->root.root.string : "<unknown>")); 6864 #endif 6865 6866 /* When generating a shared object, these relocations 6867 are copied into the output file to be resolved at run 6868 time. */ 6869 if (sreloc == NULL) 6870 { 6871 const char *name; 6872 6873 name = (bfd_elf_string_from_elf_section 6874 (input_bfd, 6875 elf_elfheader (input_bfd)->e_shstrndx, 6876 elf_section_data (input_section)->rel_hdr.sh_name)); 6877 if (name == NULL) 6878 return FALSE; 6879 6880 BFD_ASSERT (CONST_STRNEQ (name, ".rela") 6881 && strcmp (bfd_get_section_name (input_bfd, 6882 input_section), 6883 name + 5) == 0); 6884 6885 sreloc = bfd_get_section_by_name (htab->elf.dynobj, name); 6886 BFD_ASSERT (sreloc != NULL); 6887 } 6888 6889 skip = 0; 6890 outrel.r_offset = 6891 _bfd_elf_section_offset (output_bfd, info, input_section, 6892 rel->r_offset); 6893 if (outrel.r_offset == (bfd_vma) -1 6894 || outrel.r_offset == (bfd_vma) -2) 6895 skip = (int) outrel.r_offset; 6896 outrel.r_offset += (input_section->output_section->vma 6897 + input_section->output_offset); 6898 6899 if (skip) 6900 memset (&outrel, 0, sizeof outrel); 6901 else if ((h != NULL 6902 && (h->root.type == bfd_link_hash_undefined 6903 || h->root.type == bfd_link_hash_undefweak)) 6904 || !SYMBOL_REFERENCES_LOCAL (info, h)) 6905 { 6906 unresolved_reloc = FALSE; 6907 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 6908 outrel.r_addend = rel->r_addend; 6909 } 6910 else 6911 { 6912 outrel.r_addend = relocation + rel->r_addend; 6913 6914 if (r_type == R_PPC_ADDR32) 6915 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE); 6916 else 6917 { 6918 long indx = 0; 6919 6920 if (r_symndx == 0 || bfd_is_abs_section (sec)) 6921 ; 6922 else if (sec == NULL || sec->owner == NULL) 6923 { 6924 bfd_set_error (bfd_error_bad_value); 6925 ret = FALSE; 6926 } 6927 else 6928 { 6929 asection *osec; 6930 6931 /* We are turning this relocation into one 6932 against a section symbol. It would be 6933 proper to subtract the symbol's value, 6934 osec->vma, from the emitted reloc addend, 6935 but ld.so expects buggy relocs. */ 6936 osec = sec->output_section; 6937 indx = elf_section_data (osec)->dynindx; 6938 if (indx == 0) 6939 { 6940 osec = htab->elf.text_index_section; 6941 indx = elf_section_data (osec)->dynindx; 6942 } 6943 BFD_ASSERT (indx != 0); 6944 #ifdef DEBUG 6945 if (indx == 0) 6946 printf ("indx=%ld section=%s flags=%08x name=%s\n", 6947 indx, osec->name, osec->flags, 6948 h->root.root.string); 6949 #endif 6950 } 6951 6952 outrel.r_info = ELF32_R_INFO (indx, r_type); 6953 } 6954 } 6955 6956 loc = sreloc->contents; 6957 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 6958 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 6959 6960 if (skip == -1) 6961 continue; 6962 6963 /* This reloc will be computed at runtime. We clear the memory 6964 so that it contains predictable value. */ 6965 if (! skip 6966 && ((input_section->flags & SEC_ALLOC) != 0 6967 || ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE)) 6968 { 6969 relocation = howto->pc_relative ? outrel.r_offset : 0; 6970 addend = 0; 6971 break; 6972 } 6973 } 6974 break; 6975 6976 case R_PPC_RELAX32PC_PLT: 6977 case R_PPC_RELAX32_PLT: 6978 { 6979 struct plt_entry *ent = find_plt_ent (h, got2, addend); 6980 6981 if (htab->plt_type == PLT_NEW) 6982 relocation = (htab->glink->output_section->vma 6983 + htab->glink->output_offset 6984 + ent->glink_offset); 6985 else 6986 relocation = (htab->plt->output_section->vma 6987 + htab->plt->output_offset 6988 + ent->plt.offset); 6989 } 6990 if (r_type == R_PPC_RELAX32_PLT) 6991 goto relax32; 6992 /* Fall thru */ 6993 6994 case R_PPC_RELAX32PC: 6995 relocation -= (input_section->output_section->vma 6996 + input_section->output_offset 6997 + rel->r_offset - 4); 6998 /* Fall thru */ 6999 7000 case R_PPC_RELAX32: 7001 relax32: 7002 { 7003 unsigned long t0; 7004 unsigned long t1; 7005 7006 t0 = bfd_get_32 (output_bfd, contents + rel->r_offset); 7007 t1 = bfd_get_32 (output_bfd, contents + rel->r_offset + 4); 7008 7009 /* We're clearing the bits for R_PPC_ADDR16_HA 7010 and R_PPC_ADDR16_LO here. */ 7011 t0 &= ~0xffff; 7012 t1 &= ~0xffff; 7013 7014 /* t0 is HA, t1 is LO */ 7015 relocation += addend; 7016 t0 |= ((relocation + 0x8000) >> 16) & 0xffff; 7017 t1 |= relocation & 0xffff; 7018 7019 bfd_put_32 (output_bfd, t0, contents + rel->r_offset); 7020 bfd_put_32 (output_bfd, t1, contents + rel->r_offset + 4); 7021 7022 /* Rewrite the reloc and convert one of the trailing nop 7023 relocs to describe this relocation. */ 7024 BFD_ASSERT (ELF32_R_TYPE (relend[-1].r_info) == R_PPC_NONE); 7025 /* The relocs are at the bottom 2 bytes */ 7026 rel[0].r_offset += 2; 7027 memmove (rel + 1, rel, (relend - rel - 1) * sizeof (*rel)); 7028 rel[0].r_info = ELF32_R_INFO (r_symndx, R_PPC_ADDR16_HA); 7029 rel[1].r_offset += 4; 7030 rel[1].r_info = ELF32_R_INFO (r_symndx, R_PPC_ADDR16_LO); 7031 rel++; 7032 } 7033 continue; 7034 7035 /* Indirect .sdata relocation. */ 7036 case R_PPC_EMB_SDAI16: 7037 BFD_ASSERT (htab->sdata[0].section != NULL); 7038 relocation 7039 = elf_finish_pointer_linker_section (input_bfd, &htab->sdata[0], 7040 h, relocation, rel); 7041 break; 7042 7043 /* Indirect .sdata2 relocation. */ 7044 case R_PPC_EMB_SDA2I16: 7045 BFD_ASSERT (htab->sdata[1].section != NULL); 7046 relocation 7047 = elf_finish_pointer_linker_section (input_bfd, &htab->sdata[1], 7048 h, relocation, rel); 7049 break; 7050 7051 /* Handle the TOC16 reloc. We want to use the offset within the .got 7052 section, not the actual VMA. This is appropriate when generating 7053 an embedded ELF object, for which the .got section acts like the 7054 AIX .toc section. */ 7055 case R_PPC_TOC16: /* phony GOT16 relocations */ 7056 if (sec == NULL || sec->output_section == NULL) 7057 { 7058 unresolved_reloc = TRUE; 7059 break; 7060 } 7061 BFD_ASSERT (strcmp (bfd_get_section_name (abfd, sec), ".got") == 0 7062 || strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0); 7063 7064 addend -= sec->output_section->vma + sec->output_offset + 0x8000; 7065 break; 7066 7067 case R_PPC_PLTREL24: 7068 /* Relocation is to the entry for this symbol in the 7069 procedure linkage table. */ 7070 { 7071 struct plt_entry *ent = find_plt_ent (h, got2, addend); 7072 7073 addend = 0; 7074 if (ent == NULL 7075 || htab->plt == NULL) 7076 { 7077 /* We didn't make a PLT entry for this symbol. This 7078 happens when statically linking PIC code, or when 7079 using -Bsymbolic. */ 7080 break; 7081 } 7082 7083 unresolved_reloc = FALSE; 7084 if (htab->plt_type == PLT_NEW) 7085 relocation = (htab->glink->output_section->vma 7086 + htab->glink->output_offset 7087 + ent->glink_offset); 7088 else 7089 relocation = (htab->plt->output_section->vma 7090 + htab->plt->output_offset 7091 + ent->plt.offset); 7092 } 7093 break; 7094 7095 /* Relocate against _SDA_BASE_. */ 7096 case R_PPC_SDAREL16: 7097 { 7098 const char *name; 7099 7100 if (sec == NULL || sec->output_section == NULL) 7101 { 7102 unresolved_reloc = TRUE; 7103 break; 7104 } 7105 7106 name = bfd_get_section_name (abfd, sec->output_section); 7107 if (! ((CONST_STRNEQ (name, ".sdata") 7108 && (name[6] == 0 || name[6] == '.')) 7109 || (CONST_STRNEQ (name, ".sbss") 7110 && (name[5] == 0 || name[5] == '.')))) 7111 { 7112 (*_bfd_error_handler) 7113 (_("%B: the target (%s) of a %s relocation is " 7114 "in the wrong output section (%s)"), 7115 input_bfd, 7116 sym_name, 7117 howto->name, 7118 name); 7119 } 7120 addend -= SYM_VAL (htab->sdata[0].sym); 7121 } 7122 break; 7123 7124 /* Relocate against _SDA2_BASE_. */ 7125 case R_PPC_EMB_SDA2REL: 7126 { 7127 const char *name; 7128 7129 if (sec == NULL || sec->output_section == NULL) 7130 { 7131 unresolved_reloc = TRUE; 7132 break; 7133 } 7134 7135 name = bfd_get_section_name (abfd, sec->output_section); 7136 if (! (CONST_STRNEQ (name, ".sdata2") 7137 || CONST_STRNEQ (name, ".sbss2"))) 7138 { 7139 (*_bfd_error_handler) 7140 (_("%B: the target (%s) of a %s relocation is " 7141 "in the wrong output section (%s)"), 7142 input_bfd, 7143 sym_name, 7144 howto->name, 7145 name); 7146 7147 bfd_set_error (bfd_error_bad_value); 7148 ret = FALSE; 7149 continue; 7150 } 7151 addend -= SYM_VAL (htab->sdata[1].sym); 7152 } 7153 break; 7154 7155 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */ 7156 case R_PPC_EMB_SDA21: 7157 case R_PPC_EMB_RELSDA: 7158 { 7159 const char *name; 7160 int reg; 7161 7162 if (sec == NULL || sec->output_section == NULL) 7163 { 7164 unresolved_reloc = TRUE; 7165 break; 7166 } 7167 7168 name = bfd_get_section_name (abfd, sec->output_section); 7169 if (((CONST_STRNEQ (name, ".sdata") 7170 && (name[6] == 0 || name[6] == '.')) 7171 || (CONST_STRNEQ (name, ".sbss") 7172 && (name[5] == 0 || name[5] == '.')))) 7173 { 7174 reg = 13; 7175 addend -= SYM_VAL (htab->sdata[0].sym); 7176 } 7177 else if (CONST_STRNEQ (name, ".sdata2") 7178 || CONST_STRNEQ (name, ".sbss2")) 7179 { 7180 reg = 2; 7181 addend -= SYM_VAL (htab->sdata[1].sym); 7182 } 7183 else if (strcmp (name, ".PPC.EMB.sdata0") == 0 7184 || strcmp (name, ".PPC.EMB.sbss0") == 0) 7185 { 7186 reg = 0; 7187 } 7188 else 7189 { 7190 (*_bfd_error_handler) 7191 (_("%B: the target (%s) of a %s relocation is " 7192 "in the wrong output section (%s)"), 7193 input_bfd, 7194 sym_name, 7195 howto->name, 7196 name); 7197 7198 bfd_set_error (bfd_error_bad_value); 7199 ret = FALSE; 7200 continue; 7201 } 7202 7203 if (r_type == R_PPC_EMB_SDA21) 7204 { /* fill in register field */ 7205 insn = bfd_get_32 (output_bfd, contents + rel->r_offset); 7206 insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT); 7207 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 7208 } 7209 } 7210 break; 7211 7212 /* Relocate against the beginning of the section. */ 7213 case R_PPC_SECTOFF: 7214 case R_PPC_SECTOFF_LO: 7215 case R_PPC_SECTOFF_HI: 7216 case R_PPC_SECTOFF_HA: 7217 if (sec == NULL || sec->output_section == NULL) 7218 { 7219 unresolved_reloc = TRUE; 7220 break; 7221 } 7222 addend -= sec->output_section->vma; 7223 break; 7224 7225 /* Negative relocations. */ 7226 case R_PPC_EMB_NADDR32: 7227 case R_PPC_EMB_NADDR16: 7228 case R_PPC_EMB_NADDR16_LO: 7229 case R_PPC_EMB_NADDR16_HI: 7230 case R_PPC_EMB_NADDR16_HA: 7231 addend -= 2 * relocation; 7232 break; 7233 7234 case R_PPC_COPY: 7235 case R_PPC_GLOB_DAT: 7236 case R_PPC_JMP_SLOT: 7237 case R_PPC_RELATIVE: 7238 case R_PPC_PLT32: 7239 case R_PPC_PLTREL32: 7240 case R_PPC_PLT16_LO: 7241 case R_PPC_PLT16_HI: 7242 case R_PPC_PLT16_HA: 7243 case R_PPC_ADDR30: 7244 case R_PPC_EMB_RELSEC16: 7245 case R_PPC_EMB_RELST_LO: 7246 case R_PPC_EMB_RELST_HI: 7247 case R_PPC_EMB_RELST_HA: 7248 case R_PPC_EMB_BIT_FLD: 7249 (*_bfd_error_handler) 7250 (_("%B: relocation %s is not yet supported for symbol %s."), 7251 input_bfd, 7252 howto->name, 7253 sym_name); 7254 7255 bfd_set_error (bfd_error_invalid_operation); 7256 ret = FALSE; 7257 continue; 7258 } 7259 7260 /* Do any further special processing. */ 7261 switch (r_type) 7262 { 7263 default: 7264 break; 7265 7266 case R_PPC_ADDR16_HA: 7267 case R_PPC_REL16_HA: 7268 case R_PPC_SECTOFF_HA: 7269 case R_PPC_TPREL16_HA: 7270 case R_PPC_DTPREL16_HA: 7271 case R_PPC_EMB_NADDR16_HA: 7272 case R_PPC_EMB_RELST_HA: 7273 /* It's just possible that this symbol is a weak symbol 7274 that's not actually defined anywhere. In that case, 7275 'sec' would be NULL, and we should leave the symbol 7276 alone (it will be set to zero elsewhere in the link). */ 7277 if (sec == NULL) 7278 break; 7279 /* Fall thru */ 7280 7281 case R_PPC_PLT16_HA: 7282 case R_PPC_GOT16_HA: 7283 case R_PPC_GOT_TLSGD16_HA: 7284 case R_PPC_GOT_TLSLD16_HA: 7285 case R_PPC_GOT_TPREL16_HA: 7286 case R_PPC_GOT_DTPREL16_HA: 7287 /* Add 0x10000 if sign bit in 0:15 is set. 7288 Bits 0:15 are not used. */ 7289 addend += 0x8000; 7290 break; 7291 } 7292 7293 #ifdef DEBUG 7294 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, " 7295 "offset = %ld, addend = %ld\n", 7296 howto->name, 7297 (int) r_type, 7298 sym_name, 7299 r_symndx, 7300 (long) rel->r_offset, 7301 (long) addend); 7302 #endif 7303 7304 if (unresolved_reloc 7305 && !((input_section->flags & SEC_DEBUGGING) != 0 7306 && h->def_dynamic)) 7307 { 7308 (*_bfd_error_handler) 7309 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 7310 input_bfd, 7311 input_section, 7312 (long) rel->r_offset, 7313 howto->name, 7314 sym_name); 7315 ret = FALSE; 7316 } 7317 7318 r = _bfd_final_link_relocate (howto, 7319 input_bfd, 7320 input_section, 7321 contents, 7322 rel->r_offset, 7323 relocation, 7324 addend); 7325 7326 if (r != bfd_reloc_ok) 7327 { 7328 if (r == bfd_reloc_overflow) 7329 { 7330 if (warned) 7331 continue; 7332 if (h != NULL 7333 && h->root.type == bfd_link_hash_undefweak 7334 && howto->pc_relative) 7335 { 7336 /* Assume this is a call protected by other code that 7337 detect the symbol is undefined. If this is the case, 7338 we can safely ignore the overflow. If not, the 7339 program is hosed anyway, and a little warning isn't 7340 going to help. */ 7341 7342 continue; 7343 } 7344 7345 if (! (*info->callbacks->reloc_overflow) (info, 7346 (h ? &h->root : NULL), 7347 sym_name, 7348 howto->name, 7349 rel->r_addend, 7350 input_bfd, 7351 input_section, 7352 rel->r_offset)) 7353 return FALSE; 7354 } 7355 else 7356 { 7357 (*_bfd_error_handler) 7358 (_("%B(%A+0x%lx): %s reloc against `%s': error %d"), 7359 input_bfd, input_section, 7360 (long) rel->r_offset, howto->name, sym_name, (int) r); 7361 ret = FALSE; 7362 } 7363 } 7364 } 7365 7366 #ifdef DEBUG 7367 fprintf (stderr, "\n"); 7368 #endif 7369 7370 return ret; 7371 } 7372 7373 #define PPC_LO(v) ((v) & 0xffff) 7374 #define PPC_HI(v) (((v) >> 16) & 0xffff) 7375 #define PPC_HA(v) PPC_HI ((v) + 0x8000) 7376 7377 /* Finish up dynamic symbol handling. We set the contents of various 7378 dynamic sections here. */ 7379 7380 static bfd_boolean 7381 ppc_elf_finish_dynamic_symbol (bfd *output_bfd, 7382 struct bfd_link_info *info, 7383 struct elf_link_hash_entry *h, 7384 Elf_Internal_Sym *sym) 7385 { 7386 struct ppc_elf_link_hash_table *htab; 7387 struct plt_entry *ent; 7388 bfd_boolean doneone; 7389 7390 #ifdef DEBUG 7391 fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s", 7392 h->root.root.string); 7393 #endif 7394 7395 htab = ppc_elf_hash_table (info); 7396 BFD_ASSERT (htab->elf.dynobj != NULL); 7397 7398 doneone = FALSE; 7399 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 7400 if (ent->plt.offset != (bfd_vma) -1) 7401 { 7402 if (!doneone) 7403 { 7404 Elf_Internal_Rela rela; 7405 bfd_byte *loc; 7406 bfd_vma reloc_index; 7407 7408 if (htab->plt_type == PLT_NEW) 7409 reloc_index = ent->plt.offset / 4; 7410 else 7411 { 7412 reloc_index = ((ent->plt.offset - htab->plt_initial_entry_size) 7413 / htab->plt_slot_size); 7414 if (reloc_index > PLT_NUM_SINGLE_ENTRIES 7415 && htab->plt_type == PLT_OLD) 7416 reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2; 7417 } 7418 7419 /* This symbol has an entry in the procedure linkage table. 7420 Set it up. */ 7421 if (htab->plt_type == PLT_VXWORKS) 7422 { 7423 bfd_vma got_offset; 7424 const bfd_vma *plt_entry; 7425 7426 /* The first three entries in .got.plt are reserved. */ 7427 got_offset = (reloc_index + 3) * 4; 7428 7429 /* Use the right PLT. */ 7430 plt_entry = info->shared ? ppc_elf_vxworks_pic_plt_entry 7431 : ppc_elf_vxworks_plt_entry; 7432 7433 /* Fill in the .plt on VxWorks. */ 7434 if (info->shared) 7435 { 7436 bfd_put_32 (output_bfd, 7437 plt_entry[0] | PPC_HA (got_offset), 7438 htab->plt->contents + ent->plt.offset + 0); 7439 bfd_put_32 (output_bfd, 7440 plt_entry[1] | PPC_LO (got_offset), 7441 htab->plt->contents + ent->plt.offset + 4); 7442 } 7443 else 7444 { 7445 bfd_vma got_loc = got_offset + SYM_VAL (htab->elf.hgot); 7446 7447 bfd_put_32 (output_bfd, 7448 plt_entry[0] | PPC_HA (got_loc), 7449 htab->plt->contents + ent->plt.offset + 0); 7450 bfd_put_32 (output_bfd, 7451 plt_entry[1] | PPC_LO (got_loc), 7452 htab->plt->contents + ent->plt.offset + 4); 7453 } 7454 7455 bfd_put_32 (output_bfd, plt_entry[2], 7456 htab->plt->contents + ent->plt.offset + 8); 7457 bfd_put_32 (output_bfd, plt_entry[3], 7458 htab->plt->contents + ent->plt.offset + 12); 7459 7460 /* This instruction is an immediate load. The value loaded is 7461 the byte offset of the R_PPC_JMP_SLOT relocation from the 7462 start of the .rela.plt section. The value is stored in the 7463 low-order 16 bits of the load instruction. */ 7464 /* NOTE: It appears that this is now an index rather than a 7465 prescaled offset. */ 7466 bfd_put_32 (output_bfd, 7467 plt_entry[4] | reloc_index, 7468 htab->plt->contents + ent->plt.offset + 16); 7469 /* This instruction is a PC-relative branch whose target is 7470 the start of the PLT section. The address of this branch 7471 instruction is 20 bytes beyond the start of this PLT entry. 7472 The address is encoded in bits 6-29, inclusive. The value 7473 stored is right-shifted by two bits, permitting a 26-bit 7474 offset. */ 7475 bfd_put_32 (output_bfd, 7476 (plt_entry[5] 7477 | (-(ent->plt.offset + 20) & 0x03fffffc)), 7478 htab->plt->contents + ent->plt.offset + 20); 7479 bfd_put_32 (output_bfd, plt_entry[6], 7480 htab->plt->contents + ent->plt.offset + 24); 7481 bfd_put_32 (output_bfd, plt_entry[7], 7482 htab->plt->contents + ent->plt.offset + 28); 7483 7484 /* Fill in the GOT entry corresponding to this PLT slot with 7485 the address immediately after the the "bctr" instruction 7486 in this PLT entry. */ 7487 bfd_put_32 (output_bfd, (htab->plt->output_section->vma 7488 + htab->plt->output_offset 7489 + ent->plt.offset + 16), 7490 htab->sgotplt->contents + got_offset); 7491 7492 if (!info->shared) 7493 { 7494 /* Fill in a couple of entries in .rela.plt.unloaded. */ 7495 loc = htab->srelplt2->contents 7496 + ((VXWORKS_PLTRESOLVE_RELOCS + reloc_index 7497 * VXWORKS_PLT_NON_JMP_SLOT_RELOCS) 7498 * sizeof (Elf32_External_Rela)); 7499 7500 /* Provide the @ha relocation for the first instruction. */ 7501 rela.r_offset = (htab->plt->output_section->vma 7502 + htab->plt->output_offset 7503 + ent->plt.offset + 2); 7504 rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 7505 R_PPC_ADDR16_HA); 7506 rela.r_addend = got_offset; 7507 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 7508 loc += sizeof (Elf32_External_Rela); 7509 7510 /* Provide the @l relocation for the second instruction. */ 7511 rela.r_offset = (htab->plt->output_section->vma 7512 + htab->plt->output_offset 7513 + ent->plt.offset + 6); 7514 rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 7515 R_PPC_ADDR16_LO); 7516 rela.r_addend = got_offset; 7517 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 7518 loc += sizeof (Elf32_External_Rela); 7519 7520 /* Provide a relocation for the GOT entry corresponding to this 7521 PLT slot. Point it at the middle of the .plt entry. */ 7522 rela.r_offset = (htab->sgotplt->output_section->vma 7523 + htab->sgotplt->output_offset 7524 + got_offset); 7525 rela.r_info = ELF32_R_INFO (htab->elf.hplt->indx, 7526 R_PPC_ADDR32); 7527 rela.r_addend = ent->plt.offset + 16; 7528 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 7529 } 7530 7531 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT. 7532 In particular, the offset for the relocation is not the 7533 address of the PLT entry for this function, as specified 7534 by the ABI. Instead, the offset is set to the address of 7535 the GOT slot for this function. See EABI 4.4.4.1. */ 7536 rela.r_offset = (htab->sgotplt->output_section->vma 7537 + htab->sgotplt->output_offset 7538 + got_offset); 7539 7540 } 7541 else 7542 { 7543 rela.r_offset = (htab->plt->output_section->vma 7544 + htab->plt->output_offset 7545 + ent->plt.offset); 7546 if (htab->plt_type == PLT_OLD) 7547 { 7548 /* We don't need to fill in the .plt. The ppc dynamic 7549 linker will fill it in. */ 7550 } 7551 else 7552 { 7553 bfd_vma val = (htab->glink_pltresolve + ent->plt.offset 7554 + htab->glink->output_section->vma 7555 + htab->glink->output_offset); 7556 bfd_put_32 (output_bfd, val, 7557 htab->plt->contents + ent->plt.offset); 7558 } 7559 } 7560 7561 /* Fill in the entry in the .rela.plt section. */ 7562 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT); 7563 rela.r_addend = 0; 7564 7565 loc = (htab->relplt->contents 7566 + reloc_index * sizeof (Elf32_External_Rela)); 7567 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 7568 7569 if (!h->def_regular) 7570 { 7571 /* Mark the symbol as undefined, rather than as 7572 defined in the .plt section. Leave the value if 7573 there were any relocations where pointer equality 7574 matters (this is a clue for the dynamic linker, to 7575 make function pointer comparisons work between an 7576 application and shared library), otherwise set it 7577 to zero. */ 7578 sym->st_shndx = SHN_UNDEF; 7579 if (!h->pointer_equality_needed) 7580 sym->st_value = 0; 7581 else if (!h->ref_regular_nonweak) 7582 { 7583 /* This breaks function pointer comparisons, but 7584 that is better than breaking tests for a NULL 7585 function pointer. */ 7586 sym->st_value = 0; 7587 } 7588 } 7589 doneone = TRUE; 7590 } 7591 7592 if (htab->plt_type == PLT_NEW) 7593 { 7594 bfd_vma plt; 7595 unsigned char *p; 7596 7597 plt = (ent->plt.offset 7598 + htab->plt->output_section->vma 7599 + htab->plt->output_offset); 7600 p = (unsigned char *) htab->glink->contents + ent->glink_offset; 7601 7602 if (info->shared || info->pie) 7603 { 7604 bfd_vma got = 0; 7605 7606 if (ent->addend >= 32768) 7607 got = (ent->addend 7608 + ent->sec->output_section->vma 7609 + ent->sec->output_offset); 7610 else if (htab->elf.hgot != NULL) 7611 got = SYM_VAL (htab->elf.hgot); 7612 7613 plt -= got; 7614 7615 if (plt + 0x8000 < 0x10000) 7616 { 7617 bfd_put_32 (output_bfd, LWZ_11_30 + PPC_LO (plt), p); 7618 p += 4; 7619 bfd_put_32 (output_bfd, MTCTR_11, p); 7620 p += 4; 7621 bfd_put_32 (output_bfd, BCTR, p); 7622 p += 4; 7623 bfd_put_32 (output_bfd, NOP, p); 7624 p += 4; 7625 } 7626 else 7627 { 7628 bfd_put_32 (output_bfd, ADDIS_11_30 + PPC_HA (plt), p); 7629 p += 4; 7630 bfd_put_32 (output_bfd, LWZ_11_11 + PPC_LO (plt), p); 7631 p += 4; 7632 bfd_put_32 (output_bfd, MTCTR_11, p); 7633 p += 4; 7634 bfd_put_32 (output_bfd, BCTR, p); 7635 p += 4; 7636 } 7637 } 7638 else 7639 { 7640 bfd_put_32 (output_bfd, LIS_11 + PPC_HA (plt), p); 7641 p += 4; 7642 bfd_put_32 (output_bfd, LWZ_11_11 + PPC_LO (plt), p); 7643 p += 4; 7644 bfd_put_32 (output_bfd, MTCTR_11, p); 7645 p += 4; 7646 bfd_put_32 (output_bfd, BCTR, p); 7647 p += 4; 7648 7649 /* We only need one non-PIC glink stub. */ 7650 break; 7651 } 7652 } 7653 else 7654 break; 7655 } 7656 7657 if (h->needs_copy) 7658 { 7659 asection *s; 7660 Elf_Internal_Rela rela; 7661 bfd_byte *loc; 7662 7663 /* This symbols needs a copy reloc. Set it up. */ 7664 7665 #ifdef DEBUG 7666 fprintf (stderr, ", copy"); 7667 #endif 7668 7669 BFD_ASSERT (h->dynindx != -1); 7670 7671 if (ppc_elf_hash_entry (h)->has_sda_refs) 7672 s = htab->relsbss; 7673 else 7674 s = htab->relbss; 7675 BFD_ASSERT (s != NULL); 7676 7677 rela.r_offset = SYM_VAL (h); 7678 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY); 7679 rela.r_addend = 0; 7680 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 7681 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 7682 } 7683 7684 #ifdef DEBUG 7685 fprintf (stderr, "\n"); 7686 #endif 7687 7688 /* Mark some specially defined symbols as absolute. */ 7689 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 7690 || (!htab->is_vxworks 7691 && (h == htab->elf.hgot 7692 || strcmp (h->root.root.string, 7693 "_PROCEDURE_LINKAGE_TABLE_") == 0))) 7694 sym->st_shndx = SHN_ABS; 7695 7696 return TRUE; 7697 } 7698 7699 static enum elf_reloc_type_class 7700 ppc_elf_reloc_type_class (const Elf_Internal_Rela *rela) 7701 { 7702 switch (ELF32_R_TYPE (rela->r_info)) 7703 { 7704 case R_PPC_RELATIVE: 7705 return reloc_class_relative; 7706 case R_PPC_REL24: 7707 case R_PPC_ADDR24: 7708 case R_PPC_JMP_SLOT: 7709 return reloc_class_plt; 7710 case R_PPC_COPY: 7711 return reloc_class_copy; 7712 default: 7713 return reloc_class_normal; 7714 } 7715 } 7716 7717 /* Finish up the dynamic sections. */ 7718 7719 static bfd_boolean 7720 ppc_elf_finish_dynamic_sections (bfd *output_bfd, 7721 struct bfd_link_info *info) 7722 { 7723 asection *sdyn; 7724 asection *splt; 7725 struct ppc_elf_link_hash_table *htab; 7726 bfd_vma got; 7727 bfd *dynobj; 7728 bfd_boolean ret = TRUE; 7729 7730 #ifdef DEBUG 7731 fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n"); 7732 #endif 7733 7734 htab = ppc_elf_hash_table (info); 7735 dynobj = elf_hash_table (info)->dynobj; 7736 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 7737 if (htab->is_vxworks) 7738 splt = bfd_get_section_by_name (dynobj, ".plt"); 7739 else 7740 splt = NULL; 7741 7742 got = 0; 7743 if (htab->elf.hgot != NULL) 7744 got = SYM_VAL (htab->elf.hgot); 7745 7746 if (htab->elf.dynamic_sections_created) 7747 { 7748 Elf32_External_Dyn *dyncon, *dynconend; 7749 7750 BFD_ASSERT (htab->plt != NULL && sdyn != NULL); 7751 7752 dyncon = (Elf32_External_Dyn *) sdyn->contents; 7753 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 7754 for (; dyncon < dynconend; dyncon++) 7755 { 7756 Elf_Internal_Dyn dyn; 7757 asection *s; 7758 7759 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 7760 7761 switch (dyn.d_tag) 7762 { 7763 case DT_PLTGOT: 7764 if (htab->is_vxworks) 7765 s = htab->sgotplt; 7766 else 7767 s = htab->plt; 7768 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 7769 break; 7770 7771 case DT_PLTRELSZ: 7772 dyn.d_un.d_val = htab->relplt->size; 7773 break; 7774 7775 case DT_JMPREL: 7776 s = htab->relplt; 7777 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 7778 break; 7779 7780 case DT_PPC_GOT: 7781 dyn.d_un.d_ptr = got; 7782 break; 7783 7784 case DT_RELASZ: 7785 if (htab->is_vxworks) 7786 { 7787 if (htab->relplt) 7788 dyn.d_un.d_ptr -= htab->relplt->size; 7789 break; 7790 } 7791 continue; 7792 7793 default: 7794 if (htab->is_vxworks 7795 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn)) 7796 break; 7797 continue; 7798 } 7799 7800 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 7801 } 7802 } 7803 7804 if (htab->got != NULL) 7805 { 7806 if (htab->elf.hgot->root.u.def.section == htab->got 7807 || htab->elf.hgot->root.u.def.section == htab->sgotplt) 7808 { 7809 unsigned char *p = htab->elf.hgot->root.u.def.section->contents; 7810 7811 p += htab->elf.hgot->root.u.def.value; 7812 if (htab->plt_type == PLT_OLD) 7813 { 7814 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 7815 so that a function can easily find the address of 7816 _GLOBAL_OFFSET_TABLE_. */ 7817 BFD_ASSERT (htab->elf.hgot->root.u.def.value - 4 7818 < htab->elf.hgot->root.u.def.section->size); 7819 bfd_put_32 (output_bfd, 0x4e800021, p - 4); 7820 } 7821 7822 if (sdyn != NULL) 7823 { 7824 bfd_vma val = sdyn->output_section->vma + sdyn->output_offset; 7825 BFD_ASSERT (htab->elf.hgot->root.u.def.value 7826 < htab->elf.hgot->root.u.def.section->size); 7827 bfd_put_32 (output_bfd, val, p); 7828 } 7829 } 7830 else 7831 { 7832 (*_bfd_error_handler) (_("%s not defined in linker created %s"), 7833 htab->elf.hgot->root.root.string, 7834 (htab->sgotplt != NULL 7835 ? htab->sgotplt->name : htab->got->name)); 7836 bfd_set_error (bfd_error_bad_value); 7837 ret = FALSE; 7838 } 7839 7840 elf_section_data (htab->got->output_section)->this_hdr.sh_entsize = 4; 7841 } 7842 7843 /* Fill in the first entry in the VxWorks procedure linkage table. */ 7844 if (splt && splt->size > 0) 7845 { 7846 /* Use the right PLT. */ 7847 static const bfd_vma *plt_entry = NULL; 7848 plt_entry = info->shared ? 7849 ppc_elf_vxworks_pic_plt0_entry : ppc_elf_vxworks_plt0_entry; 7850 7851 if (!info->shared) 7852 { 7853 bfd_vma got_value = SYM_VAL (htab->elf.hgot); 7854 7855 bfd_put_32 (output_bfd, plt_entry[0] | PPC_HA (got_value), 7856 splt->contents + 0); 7857 bfd_put_32 (output_bfd, plt_entry[1] | PPC_LO (got_value), 7858 splt->contents + 4); 7859 } 7860 else 7861 { 7862 bfd_put_32 (output_bfd, plt_entry[0], splt->contents + 0); 7863 bfd_put_32 (output_bfd, plt_entry[1], splt->contents + 4); 7864 } 7865 bfd_put_32 (output_bfd, plt_entry[2], splt->contents + 8); 7866 bfd_put_32 (output_bfd, plt_entry[3], splt->contents + 12); 7867 bfd_put_32 (output_bfd, plt_entry[4], splt->contents + 16); 7868 bfd_put_32 (output_bfd, plt_entry[5], splt->contents + 20); 7869 bfd_put_32 (output_bfd, plt_entry[6], splt->contents + 24); 7870 bfd_put_32 (output_bfd, plt_entry[7], splt->contents + 28); 7871 7872 if (! info->shared) 7873 { 7874 Elf_Internal_Rela rela; 7875 bfd_byte *loc; 7876 7877 loc = htab->srelplt2->contents; 7878 7879 /* Output the @ha relocation for the first instruction. */ 7880 rela.r_offset = (htab->plt->output_section->vma 7881 + htab->plt->output_offset 7882 + 2); 7883 rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_PPC_ADDR16_HA); 7884 rela.r_addend = 0; 7885 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 7886 loc += sizeof (Elf32_External_Rela); 7887 7888 /* Output the @l relocation for the second instruction. */ 7889 rela.r_offset = (htab->plt->output_section->vma 7890 + htab->plt->output_offset 7891 + 6); 7892 rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_PPC_ADDR16_LO); 7893 rela.r_addend = 0; 7894 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 7895 loc += sizeof (Elf32_External_Rela); 7896 7897 /* Fix up the remaining relocations. They may have the wrong 7898 symbol index for _G_O_T_ or _P_L_T_ depending on the order 7899 in which symbols were output. */ 7900 while (loc < htab->srelplt2->contents + htab->srelplt2->size) 7901 { 7902 Elf_Internal_Rela rel; 7903 7904 bfd_elf32_swap_reloc_in (output_bfd, loc, &rel); 7905 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_PPC_ADDR16_HA); 7906 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 7907 loc += sizeof (Elf32_External_Rela); 7908 7909 bfd_elf32_swap_reloc_in (output_bfd, loc, &rel); 7910 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_PPC_ADDR16_LO); 7911 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 7912 loc += sizeof (Elf32_External_Rela); 7913 7914 bfd_elf32_swap_reloc_in (output_bfd, loc, &rel); 7915 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_PPC_ADDR32); 7916 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 7917 loc += sizeof (Elf32_External_Rela); 7918 } 7919 } 7920 } 7921 7922 if (htab->glink != NULL && htab->glink->contents != NULL) 7923 { 7924 unsigned char *p; 7925 unsigned char *endp; 7926 bfd_vma res0; 7927 unsigned int i; 7928 7929 /* 7930 * PIC glink code is the following: 7931 * 7932 * # ith PLT code stub. 7933 * addis 11,30,(plt+(i-1)*4-got)@ha 7934 * lwz 11,(plt+(i-1)*4-got)@l(11) 7935 * mtctr 11 7936 * bctr 7937 * 7938 * # A table of branches, one for each plt entry. 7939 * # The idea is that the plt call stub loads ctr and r11 with these 7940 * # addresses, so (r11 - res_0) gives the plt index * 4. 7941 * res_0: b PLTresolve 7942 * res_1: b PLTresolve 7943 * . 7944 * # Some number of entries towards the end can be nops 7945 * res_n_m3: nop 7946 * res_n_m2: nop 7947 * res_n_m1: 7948 * 7949 * PLTresolve: 7950 * addis 11,11,(1f-res_0)@ha 7951 * mflr 0 7952 * bcl 20,31,1f 7953 * 1: addi 11,11,(1b-res_0)@l 7954 * mflr 12 7955 * mtlr 0 7956 * sub 11,11,12 # r11 = index * 4 7957 * addis 12,12,(got+4-1b)@ha 7958 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve 7959 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address 7960 * mtctr 0 7961 * add 0,11,11 7962 * add 11,0,11 # r11 = index * 12 = reloc offset. 7963 * bctr 7964 */ 7965 static const unsigned int pic_plt_resolve[] = 7966 { 7967 ADDIS_11_11, 7968 MFLR_0, 7969 BCL_20_31, 7970 ADDI_11_11, 7971 MFLR_12, 7972 MTLR_0, 7973 SUB_11_11_12, 7974 ADDIS_12_12, 7975 LWZ_0_12, 7976 LWZ_12_12, 7977 MTCTR_0, 7978 ADD_0_11_11, 7979 ADD_11_0_11, 7980 BCTR, 7981 NOP, 7982 NOP 7983 }; 7984 7985 /* 7986 * Non-PIC glink code is a little simpler. 7987 * 7988 * # ith PLT code stub. 7989 * lis 11,(plt+(i-1)*4)@ha 7990 * lwz 11,(plt+(i-1)*4)@l(11) 7991 * mtctr 11 7992 * bctr 7993 * 7994 * The branch table is the same, then comes 7995 * 7996 * PLTresolve: 7997 * lis 12,(got+4)@ha 7998 * addis 11,11,(-res_0)@ha 7999 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve 8000 * addi 11,11,(-res_0)@l # r11 = index * 4 8001 * mtctr 0 8002 * add 0,11,11 8003 * lwz 12,(got+8)@l(12) # got[2] contains the map address 8004 * add 11,0,11 # r11 = index * 12 = reloc offset. 8005 * bctr 8006 */ 8007 static const unsigned int plt_resolve[] = 8008 { 8009 LIS_12, 8010 ADDIS_11_11, 8011 LWZ_0_12, 8012 ADDI_11_11, 8013 MTCTR_0, 8014 ADD_0_11_11, 8015 LWZ_12_12, 8016 ADD_11_0_11, 8017 BCTR, 8018 NOP, 8019 NOP, 8020 NOP, 8021 NOP, 8022 NOP, 8023 NOP, 8024 NOP 8025 }; 8026 8027 if (ARRAY_SIZE (pic_plt_resolve) != GLINK_PLTRESOLVE / 4) 8028 abort (); 8029 if (ARRAY_SIZE (plt_resolve) != GLINK_PLTRESOLVE / 4) 8030 abort (); 8031 8032 /* Build the branch table, one for each plt entry (less one), 8033 and perhaps some padding. */ 8034 p = htab->glink->contents; 8035 p += htab->glink_pltresolve; 8036 endp = htab->glink->contents; 8037 endp += htab->glink->size - GLINK_PLTRESOLVE; 8038 while (p < endp - 8 * 4) 8039 { 8040 bfd_put_32 (output_bfd, B + endp - p, p); 8041 p += 4; 8042 } 8043 while (p < endp) 8044 { 8045 bfd_put_32 (output_bfd, NOP, p); 8046 p += 4; 8047 } 8048 8049 res0 = (htab->glink_pltresolve 8050 + htab->glink->output_section->vma 8051 + htab->glink->output_offset); 8052 8053 /* Last comes the PLTresolve stub. */ 8054 if (info->shared || info->pie) 8055 { 8056 bfd_vma bcl; 8057 8058 for (i = 0; i < ARRAY_SIZE (pic_plt_resolve); i++) 8059 { 8060 bfd_put_32 (output_bfd, pic_plt_resolve[i], p); 8061 p += 4; 8062 } 8063 p -= 4 * ARRAY_SIZE (pic_plt_resolve); 8064 8065 bcl = (htab->glink->size - GLINK_PLTRESOLVE + 3*4 8066 + htab->glink->output_section->vma 8067 + htab->glink->output_offset); 8068 8069 bfd_put_32 (output_bfd, 8070 ADDIS_11_11 + PPC_HA (bcl - res0), p + 0*4); 8071 bfd_put_32 (output_bfd, 8072 ADDI_11_11 + PPC_LO (bcl - res0), p + 3*4); 8073 bfd_put_32 (output_bfd, 8074 ADDIS_12_12 + PPC_HA (got + 4 - bcl), p + 7*4); 8075 if (PPC_HA (got + 4 - bcl) == PPC_HA (got + 8 - bcl)) 8076 { 8077 bfd_put_32 (output_bfd, 8078 LWZ_0_12 + PPC_LO (got + 4 - bcl), p + 8*4); 8079 bfd_put_32 (output_bfd, 8080 LWZ_12_12 + PPC_LO (got + 8 - bcl), p + 9*4); 8081 } 8082 else 8083 { 8084 bfd_put_32 (output_bfd, 8085 LWZU_0_12 + PPC_LO (got + 4 - bcl), p + 8*4); 8086 bfd_put_32 (output_bfd, 8087 LWZ_12_12 + 4, p + 9*4); 8088 } 8089 } 8090 else 8091 { 8092 for (i = 0; i < ARRAY_SIZE (plt_resolve); i++) 8093 { 8094 bfd_put_32 (output_bfd, plt_resolve[i], p); 8095 p += 4; 8096 } 8097 p -= 4 * ARRAY_SIZE (plt_resolve); 8098 8099 bfd_put_32 (output_bfd, 8100 LIS_12 + PPC_HA (got + 4), p + 0*4); 8101 bfd_put_32 (output_bfd, 8102 ADDIS_11_11 + PPC_HA (-res0), p + 1*4); 8103 bfd_put_32 (output_bfd, 8104 ADDI_11_11 + PPC_LO (-res0), p + 3*4); 8105 if (PPC_HA (got + 4) == PPC_HA (got + 8)) 8106 { 8107 bfd_put_32 (output_bfd, 8108 LWZ_0_12 + PPC_LO (got + 4), p + 2*4); 8109 bfd_put_32 (output_bfd, 8110 LWZ_12_12 + PPC_LO (got + 8), p + 6*4); 8111 } 8112 else 8113 { 8114 bfd_put_32 (output_bfd, 8115 LWZU_0_12 + PPC_LO (got + 4), p + 2*4); 8116 bfd_put_32 (output_bfd, 8117 LWZ_12_12 + 4, p + 6*4); 8118 } 8119 } 8120 } 8121 8122 return ret; 8123 } 8124 8125 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec 8126 #define TARGET_LITTLE_NAME "elf32-powerpcle" 8127 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec 8128 #define TARGET_BIG_NAME "elf32-powerpc" 8129 #define ELF_ARCH bfd_arch_powerpc 8130 #define ELF_MACHINE_CODE EM_PPC 8131 #ifdef __QNXTARGET__ 8132 #define ELF_MAXPAGESIZE 0x1000 8133 #else 8134 #define ELF_MAXPAGESIZE 0x10000 8135 #endif 8136 #define ELF_MINPAGESIZE 0x1000 8137 #define ELF_COMMONPAGESIZE 0x1000 8138 #define elf_info_to_howto ppc_elf_info_to_howto 8139 8140 #ifdef EM_CYGNUS_POWERPC 8141 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC 8142 #endif 8143 8144 #ifdef EM_PPC_OLD 8145 #define ELF_MACHINE_ALT2 EM_PPC_OLD 8146 #endif 8147 8148 #define elf_backend_plt_not_loaded 1 8149 #define elf_backend_can_gc_sections 1 8150 #define elf_backend_can_refcount 1 8151 #define elf_backend_rela_normal 1 8152 8153 #define bfd_elf32_mkobject ppc_elf_mkobject 8154 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data 8155 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section 8156 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup 8157 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup 8158 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags 8159 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create 8160 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab 8161 8162 #define elf_backend_object_p ppc_elf_object_p 8163 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook 8164 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook 8165 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr 8166 #define elf_backend_relocate_section ppc_elf_relocate_section 8167 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections 8168 #define elf_backend_check_relocs ppc_elf_check_relocs 8169 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol 8170 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol 8171 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook 8172 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections 8173 #define elf_backend_hash_symbol ppc_elf_hash_symbol 8174 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol 8175 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections 8176 #define elf_backend_fake_sections ppc_elf_fake_sections 8177 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers 8178 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus 8179 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo 8180 #define elf_backend_write_core_note ppc_elf_write_core_note 8181 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class 8182 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing 8183 #define elf_backend_final_write_processing ppc_elf_final_write_processing 8184 #define elf_backend_write_section ppc_elf_write_section 8185 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr 8186 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val 8187 #define elf_backend_action_discarded ppc_elf_action_discarded 8188 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 8189 8190 #include "elf32-target.h" 8191 8192 /* VxWorks Target */ 8193 8194 #undef TARGET_LITTLE_SYM 8195 #undef TARGET_LITTLE_NAME 8196 8197 #undef TARGET_BIG_SYM 8198 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec 8199 #undef TARGET_BIG_NAME 8200 #define TARGET_BIG_NAME "elf32-powerpc-vxworks" 8201 8202 /* VxWorks uses the elf default section flags for .plt. */ 8203 static const struct bfd_elf_special_section * 8204 ppc_elf_vxworks_get_sec_type_attr (bfd *abfd ATTRIBUTE_UNUSED, asection *sec) 8205 { 8206 if (sec->name == NULL) 8207 return NULL; 8208 8209 if (strcmp (sec->name, ".plt") == 0) 8210 return _bfd_elf_get_sec_type_attr (abfd, sec); 8211 8212 return ppc_elf_get_sec_type_attr (abfd, sec); 8213 } 8214 8215 /* Like ppc_elf_link_hash_table_create, but overrides 8216 appropriately for VxWorks. */ 8217 static struct bfd_link_hash_table * 8218 ppc_elf_vxworks_link_hash_table_create (bfd *abfd) 8219 { 8220 struct bfd_link_hash_table *ret; 8221 8222 ret = ppc_elf_link_hash_table_create (abfd); 8223 if (ret) 8224 { 8225 struct ppc_elf_link_hash_table *htab 8226 = (struct ppc_elf_link_hash_table *)ret; 8227 htab->is_vxworks = 1; 8228 htab->plt_type = PLT_VXWORKS; 8229 htab->plt_entry_size = VXWORKS_PLT_ENTRY_SIZE; 8230 htab->plt_slot_size = VXWORKS_PLT_ENTRY_SIZE; 8231 htab->plt_initial_entry_size = VXWORKS_PLT_INITIAL_ENTRY_SIZE; 8232 } 8233 return ret; 8234 } 8235 8236 /* Tweak magic VxWorks symbols as they are loaded. */ 8237 static bfd_boolean 8238 ppc_elf_vxworks_add_symbol_hook (bfd *abfd, 8239 struct bfd_link_info *info, 8240 Elf_Internal_Sym *sym, 8241 const char **namep ATTRIBUTE_UNUSED, 8242 flagword *flagsp ATTRIBUTE_UNUSED, 8243 asection **secp, 8244 bfd_vma *valp) 8245 { 8246 if (!elf_vxworks_add_symbol_hook(abfd, info, sym,namep, flagsp, secp, 8247 valp)) 8248 return FALSE; 8249 8250 return ppc_elf_add_symbol_hook(abfd, info, sym,namep, flagsp, secp, valp); 8251 } 8252 8253 static void 8254 ppc_elf_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker) 8255 { 8256 ppc_elf_final_write_processing(abfd, linker); 8257 elf_vxworks_final_write_processing(abfd, linker); 8258 } 8259 8260 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so 8261 define it. */ 8262 #undef elf_backend_want_plt_sym 8263 #define elf_backend_want_plt_sym 1 8264 #undef elf_backend_want_got_plt 8265 #define elf_backend_want_got_plt 1 8266 #undef elf_backend_got_symbol_offset 8267 #define elf_backend_got_symbol_offset 0 8268 #undef elf_backend_plt_not_loaded 8269 #define elf_backend_plt_not_loaded 0 8270 #undef elf_backend_plt_readonly 8271 #define elf_backend_plt_readonly 1 8272 #undef elf_backend_got_header_size 8273 #define elf_backend_got_header_size 12 8274 8275 #undef bfd_elf32_get_synthetic_symtab 8276 8277 #undef bfd_elf32_bfd_link_hash_table_create 8278 #define bfd_elf32_bfd_link_hash_table_create \ 8279 ppc_elf_vxworks_link_hash_table_create 8280 #undef elf_backend_add_symbol_hook 8281 #define elf_backend_add_symbol_hook \ 8282 ppc_elf_vxworks_add_symbol_hook 8283 #undef elf_backend_link_output_symbol_hook 8284 #define elf_backend_link_output_symbol_hook \ 8285 elf_vxworks_link_output_symbol_hook 8286 #undef elf_backend_final_write_processing 8287 #define elf_backend_final_write_processing \ 8288 ppc_elf_vxworks_final_write_processing 8289 #undef elf_backend_get_sec_type_attr 8290 #define elf_backend_get_sec_type_attr \ 8291 ppc_elf_vxworks_get_sec_type_attr 8292 #undef elf_backend_emit_relocs 8293 #define elf_backend_emit_relocs \ 8294 elf_vxworks_emit_relocs 8295 8296 #undef elf32_bed 8297 #define elf32_bed ppc_elf_vxworks_bed 8298 8299 #include "elf32-target.h" 8300