1 /* CRIS-specific support for 32-bit ELF. 2 Copyright (C) 2000-2018 Free Software Foundation, Inc. 3 Contributed by Axis Communications AB. 4 Written by Hans-Peter Nilsson, based on elf32-fr30.c 5 PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c. 6 7 This file is part of BFD, the Binary File Descriptor library. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 22 MA 02110-1301, USA. */ 23 24 #include "sysdep.h" 25 #include "bfd.h" 26 #include "libbfd.h" 27 #include "elf-bfd.h" 28 #include "elf/cris.h" 29 #include <limits.h> 30 31 bfd_reloc_status_type 32 cris_elf_pcrel_reloc (bfd *, arelent *, asymbol *, void *, 33 asection *, bfd *, char **); 34 static bfd_boolean 35 cris_elf_set_mach_from_flags (bfd *, unsigned long); 36 37 /* Forward declarations. */ 38 static reloc_howto_type cris_elf_howto_table [] = 39 { 40 /* This reloc does nothing. */ 41 HOWTO (R_CRIS_NONE, /* type */ 42 0, /* rightshift */ 43 3, /* size (0 = byte, 1 = short, 2 = long) */ 44 0, /* bitsize */ 45 FALSE, /* pc_relative */ 46 0, /* bitpos */ 47 complain_overflow_dont, /* complain_on_overflow */ 48 bfd_elf_generic_reloc, /* special_function */ 49 "R_CRIS_NONE", /* name */ 50 FALSE, /* partial_inplace */ 51 0, /* src_mask */ 52 0, /* dst_mask */ 53 FALSE), /* pcrel_offset */ 54 55 /* An 8 bit absolute relocation. */ 56 HOWTO (R_CRIS_8, /* type */ 57 0, /* rightshift */ 58 0, /* size (0 = byte, 1 = short, 2 = long) */ 59 8, /* bitsize */ 60 FALSE, /* pc_relative */ 61 0, /* bitpos */ 62 complain_overflow_bitfield, /* complain_on_overflow */ 63 bfd_elf_generic_reloc, /* special_function */ 64 "R_CRIS_8", /* name */ 65 FALSE, /* partial_inplace */ 66 0x0000, /* src_mask */ 67 0x00ff, /* dst_mask */ 68 FALSE), /* pcrel_offset */ 69 70 /* A 16 bit absolute relocation. */ 71 HOWTO (R_CRIS_16, /* type */ 72 0, /* rightshift */ 73 1, /* size (0 = byte, 1 = short, 2 = long) */ 74 16, /* bitsize */ 75 FALSE, /* pc_relative */ 76 0, /* bitpos */ 77 complain_overflow_bitfield, /* complain_on_overflow */ 78 bfd_elf_generic_reloc, /* special_function */ 79 "R_CRIS_16", /* name */ 80 FALSE, /* partial_inplace */ 81 0x00000000, /* src_mask */ 82 0x0000ffff, /* dst_mask */ 83 FALSE), /* pcrel_offset */ 84 85 /* A 32 bit absolute relocation. */ 86 HOWTO (R_CRIS_32, /* type */ 87 0, /* rightshift */ 88 2, /* size (0 = byte, 1 = short, 2 = long) */ 89 32, /* bitsize */ 90 FALSE, /* pc_relative */ 91 0, /* bitpos */ 92 /* We don't want overflow complaints for 64-bit vma builds 93 for e.g. sym+0x40000000 (or actually sym-0xc0000000 in 94 32-bit ELF) where sym=0xc0001234. 95 Don't do this for the PIC relocs, as we don't expect to 96 see them with large offsets. */ 97 complain_overflow_dont, /* complain_on_overflow */ 98 bfd_elf_generic_reloc, /* special_function */ 99 "R_CRIS_32", /* name */ 100 FALSE, /* partial_inplace */ 101 0x00000000, /* src_mask */ 102 0xffffffff, /* dst_mask */ 103 FALSE), /* pcrel_offset */ 104 105 /* An 8 bit PC-relative relocation. */ 106 HOWTO (R_CRIS_8_PCREL, /* type */ 107 0, /* rightshift */ 108 0, /* size (0 = byte, 1 = short, 2 = long) */ 109 8, /* bitsize */ 110 TRUE, /* pc_relative */ 111 0, /* bitpos */ 112 complain_overflow_bitfield, /* complain_on_overflow */ 113 cris_elf_pcrel_reloc, /* special_function */ 114 "R_CRIS_8_PCREL", /* name */ 115 FALSE, /* partial_inplace */ 116 0x0000, /* src_mask */ 117 0x00ff, /* dst_mask */ 118 TRUE), /* pcrel_offset */ 119 120 /* A 16 bit PC-relative relocation. */ 121 HOWTO (R_CRIS_16_PCREL, /* type */ 122 0, /* rightshift */ 123 1, /* size (0 = byte, 1 = short, 2 = long) */ 124 16, /* bitsize */ 125 TRUE, /* pc_relative */ 126 0, /* bitpos */ 127 complain_overflow_bitfield, /* complain_on_overflow */ 128 cris_elf_pcrel_reloc, /* special_function */ 129 "R_CRIS_16_PCREL", /* name */ 130 FALSE, /* partial_inplace */ 131 0x00000000, /* src_mask */ 132 0x0000ffff, /* dst_mask */ 133 TRUE), /* pcrel_offset */ 134 135 /* A 32 bit PC-relative relocation. */ 136 HOWTO (R_CRIS_32_PCREL, /* type */ 137 0, /* rightshift */ 138 2, /* size (0 = byte, 1 = short, 2 = long) */ 139 32, /* bitsize */ 140 TRUE, /* pc_relative */ 141 0, /* bitpos */ 142 complain_overflow_bitfield, /* complain_on_overflow */ 143 cris_elf_pcrel_reloc, /* special_function */ 144 "R_CRIS_32_PCREL", /* name */ 145 FALSE, /* partial_inplace */ 146 0x00000000, /* src_mask */ 147 0xffffffff, /* dst_mask */ 148 TRUE), /* pcrel_offset */ 149 150 /* GNU extension to record C++ vtable hierarchy. */ 151 HOWTO (R_CRIS_GNU_VTINHERIT, /* type */ 152 0, /* rightshift */ 153 2, /* size (0 = byte, 1 = short, 2 = long) */ 154 0, /* bitsize */ 155 FALSE, /* pc_relative */ 156 0, /* bitpos */ 157 complain_overflow_dont, /* complain_on_overflow */ 158 NULL, /* special_function */ 159 "R_CRIS_GNU_VTINHERIT", /* name */ 160 FALSE, /* partial_inplace */ 161 0, /* src_mask */ 162 0, /* dst_mask */ 163 FALSE), /* pcrel_offset */ 164 165 /* GNU extension to record C++ vtable member usage. */ 166 HOWTO (R_CRIS_GNU_VTENTRY, /* type */ 167 0, /* rightshift */ 168 2, /* size (0 = byte, 1 = short, 2 = long) */ 169 0, /* bitsize */ 170 FALSE, /* pc_relative */ 171 0, /* bitpos */ 172 complain_overflow_dont, /* complain_on_overflow */ 173 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 174 "R_CRIS_GNU_VTENTRY", /* name */ 175 FALSE, /* partial_inplace */ 176 0, /* src_mask */ 177 0, /* dst_mask */ 178 FALSE), /* pcrel_offset */ 179 180 /* This is used only by the dynamic linker. The symbol should exist 181 both in the object being run and in some shared library. The 182 dynamic linker copies the data addressed by the symbol from the 183 shared library into the object, because the object being 184 run has to have the data at some particular address. */ 185 HOWTO (R_CRIS_COPY, /* type */ 186 0, /* rightshift */ 187 2, /* size (0 = byte, 1 = short, 2 = long) */ 188 32, /* bitsize */ 189 FALSE, /* pc_relative */ 190 0, /* bitpos */ 191 complain_overflow_bitfield, /* complain_on_overflow */ 192 bfd_elf_generic_reloc, /* special_function */ 193 "R_CRIS_COPY", /* name */ 194 FALSE, /* partial_inplace */ 195 0, /* src_mask */ 196 0, /* dst_mask */ 197 FALSE), /* pcrel_offset */ 198 199 /* Like R_CRIS_32, but used when setting global offset table entries. */ 200 HOWTO (R_CRIS_GLOB_DAT, /* type */ 201 0, /* rightshift */ 202 2, /* size (0 = byte, 1 = short, 2 = long) */ 203 32, /* bitsize */ 204 FALSE, /* pc_relative */ 205 0, /* bitpos */ 206 complain_overflow_bitfield, /* complain_on_overflow */ 207 bfd_elf_generic_reloc, /* special_function */ 208 "R_CRIS_GLOB_DAT", /* name */ 209 FALSE, /* partial_inplace */ 210 0, /* src_mask */ 211 0xffffffff, /* dst_mask */ 212 FALSE), /* pcrel_offset */ 213 214 /* Marks a procedure linkage table entry for a symbol. */ 215 HOWTO (R_CRIS_JUMP_SLOT, /* type */ 216 0, /* rightshift */ 217 2, /* size (0 = byte, 1 = short, 2 = long) */ 218 32, /* bitsize */ 219 FALSE, /* pc_relative */ 220 0, /* bitpos */ 221 complain_overflow_bitfield, /* complain_on_overflow */ 222 bfd_elf_generic_reloc, /* special_function */ 223 "R_CRIS_JUMP_SLOT", /* name */ 224 FALSE, /* partial_inplace */ 225 0, /* src_mask */ 226 0, /* dst_mask */ 227 FALSE), /* pcrel_offset */ 228 229 /* Used only by the dynamic linker. When the object is run, this 230 longword is set to the load address of the object, plus the 231 addend. */ 232 HOWTO (R_CRIS_RELATIVE, /* type */ 233 0, /* rightshift */ 234 2, /* size (0 = byte, 1 = short, 2 = long) */ 235 32, /* bitsize */ 236 FALSE, /* pc_relative */ 237 0, /* bitpos */ 238 complain_overflow_bitfield, /* complain_on_overflow */ 239 bfd_elf_generic_reloc, /* special_function */ 240 "R_CRIS_RELATIVE", /* name */ 241 FALSE, /* partial_inplace */ 242 0, /* src_mask */ 243 0xffffffff, /* dst_mask */ 244 FALSE), /* pcrel_offset */ 245 246 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */ 247 HOWTO (R_CRIS_16_GOT, /* type */ 248 0, /* rightshift */ 249 1, /* size (0 = byte, 1 = short, 2 = long) */ 250 16, /* bitsize */ 251 FALSE, /* pc_relative */ 252 0, /* bitpos */ 253 complain_overflow_bitfield, /* complain_on_overflow */ 254 bfd_elf_generic_reloc, /* special_function */ 255 "R_CRIS_16_GOT", /* name */ 256 FALSE, /* partial_inplace */ 257 0, /* src_mask */ 258 0xffff, /* dst_mask */ 259 FALSE), /* pcrel_offset */ 260 261 HOWTO (R_CRIS_32_GOT, /* type */ 262 0, /* rightshift */ 263 2, /* size (0 = byte, 1 = short, 2 = long) */ 264 32, /* bitsize */ 265 FALSE, /* pc_relative */ 266 0, /* bitpos */ 267 complain_overflow_bitfield, /* complain_on_overflow */ 268 bfd_elf_generic_reloc, /* special_function */ 269 "R_CRIS_32_GOT", /* name */ 270 FALSE, /* partial_inplace */ 271 0, /* src_mask */ 272 0xffffffff, /* dst_mask */ 273 FALSE), /* pcrel_offset */ 274 275 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of 276 the GOT table for the symbol. */ 277 HOWTO (R_CRIS_16_GOTPLT, /* type */ 278 0, /* rightshift */ 279 1, /* size (0 = byte, 1 = short, 2 = long) */ 280 16, /* bitsize */ 281 FALSE, /* pc_relative */ 282 0, /* bitpos */ 283 complain_overflow_bitfield, /* complain_on_overflow */ 284 bfd_elf_generic_reloc, /* special_function */ 285 "R_CRIS_16_GOTPLT", /* name */ 286 FALSE, /* partial_inplace */ 287 0, /* src_mask */ 288 0xffff, /* dst_mask */ 289 FALSE), /* pcrel_offset */ 290 291 HOWTO (R_CRIS_32_GOTPLT, /* type */ 292 0, /* rightshift */ 293 2, /* size (0 = byte, 1 = short, 2 = long) */ 294 32, /* bitsize */ 295 FALSE, /* pc_relative */ 296 0, /* bitpos */ 297 complain_overflow_bitfield, /* complain_on_overflow */ 298 bfd_elf_generic_reloc, /* special_function */ 299 "R_CRIS_32_GOTPLT", /* name */ 300 FALSE, /* partial_inplace */ 301 0, /* src_mask */ 302 0xffffffff, /* dst_mask */ 303 FALSE), /* pcrel_offset */ 304 305 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should 306 be necessary. */ 307 HOWTO (R_CRIS_32_GOTREL, /* type */ 308 0, /* rightshift */ 309 2, /* size (0 = byte, 1 = short, 2 = long) */ 310 32, /* bitsize */ 311 FALSE, /* pc_relative */ 312 0, /* bitpos */ 313 complain_overflow_bitfield, /* complain_on_overflow */ 314 bfd_elf_generic_reloc, /* special_function */ 315 "R_CRIS_32_GOTREL", /* name */ 316 FALSE, /* partial_inplace */ 317 0, /* src_mask */ 318 0xffffffff, /* dst_mask */ 319 FALSE), /* pcrel_offset */ 320 321 /* A 32-bit offset from GOT to entry for this symbol in PLT and request 322 to create PLT entry for symbol. */ 323 HOWTO (R_CRIS_32_PLT_GOTREL, /* type */ 324 0, /* rightshift */ 325 2, /* size (0 = byte, 1 = short, 2 = long) */ 326 32, /* bitsize */ 327 FALSE, /* pc_relative */ 328 0, /* bitpos */ 329 complain_overflow_bitfield, /* complain_on_overflow */ 330 bfd_elf_generic_reloc, /* special_function */ 331 "R_CRIS_32_PLT_GOTREL", /* name */ 332 FALSE, /* partial_inplace */ 333 0, /* src_mask */ 334 0xffffffff, /* dst_mask */ 335 FALSE), /* pcrel_offset */ 336 337 /* A 32-bit offset from PC (location after the relocation) + addend to 338 entry for this symbol in PLT and request to create PLT entry for 339 symbol. */ 340 HOWTO (R_CRIS_32_PLT_PCREL, /* type */ 341 0, /* rightshift */ 342 2, /* size (0 = byte, 1 = short, 2 = long) */ 343 32, /* bitsize */ 344 TRUE, /* pc_relative */ 345 0, /* bitpos */ 346 complain_overflow_bitfield, /* complain_on_overflow */ 347 cris_elf_pcrel_reloc, /* special_function */ 348 "R_CRIS_32_PLT_PCREL", /* name */ 349 FALSE, /* partial_inplace */ 350 0, /* src_mask */ 351 0xffffffff, /* dst_mask */ 352 TRUE), /* pcrel_offset */ 353 354 /* We don't handle these in any special manner and cross-format 355 linking is not supported; just recognize them enough to pass them 356 around. FIXME: do the same for most PIC relocs and add sanity 357 tests to actually refuse gracefully to handle these and PIC 358 relocs for cross-format linking. */ 359 #define TLSHOWTO32(name) \ 360 HOWTO (name, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, \ 361 bfd_elf_generic_reloc, #name, FALSE, 0, 0xffffffff, FALSE) 362 #define TLSHOWTO16X(name, X) \ 363 HOWTO (name, 0, 1, 16, FALSE, 0, complain_overflow_ ## X, \ 364 bfd_elf_generic_reloc, #name, FALSE, 0, 0xffff, FALSE) 365 #define TLSHOWTO16(name) TLSHOWTO16X(name, unsigned) 366 #define TLSHOWTO16S(name) TLSHOWTO16X(name, signed) 367 368 TLSHOWTO32 (R_CRIS_32_GOT_GD), 369 TLSHOWTO16 (R_CRIS_16_GOT_GD), 370 TLSHOWTO32 (R_CRIS_32_GD), 371 TLSHOWTO32 (R_CRIS_DTP), 372 TLSHOWTO32 (R_CRIS_32_DTPREL), 373 TLSHOWTO16S (R_CRIS_16_DTPREL), 374 TLSHOWTO32 (R_CRIS_32_GOT_TPREL), 375 TLSHOWTO16S (R_CRIS_16_GOT_TPREL), 376 TLSHOWTO32 (R_CRIS_32_TPREL), 377 TLSHOWTO16S (R_CRIS_16_TPREL), 378 TLSHOWTO32 (R_CRIS_DTPMOD), 379 TLSHOWTO32 (R_CRIS_32_IE) 380 }; 381 382 /* Map BFD reloc types to CRIS ELF reloc types. */ 383 384 struct cris_reloc_map 385 { 386 bfd_reloc_code_real_type bfd_reloc_val; 387 unsigned int cris_reloc_val; 388 }; 389 390 static const struct cris_reloc_map cris_reloc_map [] = 391 { 392 { BFD_RELOC_NONE, R_CRIS_NONE }, 393 { BFD_RELOC_8, R_CRIS_8 }, 394 { BFD_RELOC_16, R_CRIS_16 }, 395 { BFD_RELOC_32, R_CRIS_32 }, 396 { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL }, 397 { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL }, 398 { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL }, 399 { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT }, 400 { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY }, 401 { BFD_RELOC_CRIS_COPY, R_CRIS_COPY }, 402 { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT }, 403 { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT }, 404 { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE }, 405 { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT }, 406 { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT }, 407 { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT }, 408 { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT }, 409 { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL }, 410 { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL }, 411 { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL }, 412 { BFD_RELOC_CRIS_32_GOT_GD, R_CRIS_32_GOT_GD }, 413 { BFD_RELOC_CRIS_16_GOT_GD, R_CRIS_16_GOT_GD }, 414 { BFD_RELOC_CRIS_32_GD, R_CRIS_32_GD }, 415 { BFD_RELOC_CRIS_DTP, R_CRIS_DTP }, 416 { BFD_RELOC_CRIS_32_DTPREL, R_CRIS_32_DTPREL }, 417 { BFD_RELOC_CRIS_16_DTPREL, R_CRIS_16_DTPREL }, 418 { BFD_RELOC_CRIS_32_GOT_TPREL, R_CRIS_32_GOT_TPREL }, 419 { BFD_RELOC_CRIS_16_GOT_TPREL, R_CRIS_16_GOT_TPREL }, 420 { BFD_RELOC_CRIS_32_TPREL, R_CRIS_32_TPREL }, 421 { BFD_RELOC_CRIS_16_TPREL, R_CRIS_16_TPREL }, 422 { BFD_RELOC_CRIS_DTPMOD, R_CRIS_DTPMOD }, 423 { BFD_RELOC_CRIS_32_IE, R_CRIS_32_IE } 424 }; 425 426 static reloc_howto_type * 427 cris_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 428 bfd_reloc_code_real_type code) 429 { 430 unsigned int i; 431 432 for (i = 0; i < sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); i++) 433 if (cris_reloc_map [i].bfd_reloc_val == code) 434 return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val]; 435 436 return NULL; 437 } 438 439 static reloc_howto_type * 440 cris_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 441 { 442 unsigned int i; 443 444 for (i = 0; 445 i < sizeof (cris_elf_howto_table) / sizeof (cris_elf_howto_table[0]); 446 i++) 447 if (cris_elf_howto_table[i].name != NULL 448 && strcasecmp (cris_elf_howto_table[i].name, r_name) == 0) 449 return &cris_elf_howto_table[i]; 450 451 return NULL; 452 } 453 454 /* Set the howto pointer for an CRIS ELF reloc. */ 455 456 static bfd_boolean 457 cris_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, 458 arelent * cache_ptr, 459 Elf_Internal_Rela * dst) 460 { 461 enum elf_cris_reloc_type r_type; 462 463 r_type = ELF32_R_TYPE (dst->r_info); 464 if (r_type >= R_CRIS_max) 465 { 466 /* xgettext:c-format */ 467 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 468 abfd, r_type); 469 bfd_set_error (bfd_error_bad_value); 470 return FALSE; 471 } 472 cache_ptr->howto = & cris_elf_howto_table [r_type]; 473 return TRUE; 474 } 475 476 bfd_reloc_status_type 477 cris_elf_pcrel_reloc (bfd *abfd ATTRIBUTE_UNUSED, 478 arelent *reloc_entry, 479 asymbol *symbol, 480 void * data ATTRIBUTE_UNUSED, 481 asection *input_section, 482 bfd *output_bfd, 483 char **error_message ATTRIBUTE_UNUSED) 484 { 485 /* By default (using only bfd_elf_generic_reloc when linking to 486 non-ELF formats) PC-relative relocs are relative to the beginning 487 of the reloc. CRIS PC-relative relocs are relative to the position 488 *after* the reloc because that's what pre-CRISv32 PC points to 489 after reading an insn field with that reloc. (For CRISv32, PC is 490 actually relative to the start of the insn, but we keep the old 491 definition.) Still, we use as much generic machinery as we can. 492 493 Only adjust when doing a final link. */ 494 if (output_bfd == (bfd *) NULL) 495 reloc_entry->addend -= 1 << reloc_entry->howto->size; 496 497 return 498 bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 499 input_section, output_bfd, error_message); 500 } 501 502 /* Support for core dump NOTE sections. 503 The slightly unintuitive code layout is an attempt to keep at least 504 some similarities with other ports, hoping to simplify general 505 changes, while still keeping Linux/CRIS and Linux/CRISv32 code apart. */ 506 507 static bfd_boolean 508 cris_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 509 { 510 int offset; 511 size_t size; 512 513 if (bfd_get_mach (abfd) == bfd_mach_cris_v32) 514 switch (note->descsz) 515 { 516 default: 517 return FALSE; 518 519 case 202: /* Linux/CRISv32 */ 520 /* pr_cursig */ 521 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 522 523 /* pr_pid */ 524 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 22); 525 526 /* pr_reg */ 527 offset = 70; 528 size = 128; 529 530 break; 531 } 532 else 533 switch (note->descsz) 534 { 535 default: 536 return FALSE; 537 538 case 214: /* Linux/CRIS */ 539 /* pr_cursig */ 540 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 541 542 /* pr_pid */ 543 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 22); 544 545 /* pr_reg */ 546 offset = 70; 547 size = 140; 548 549 break; 550 } 551 552 /* Make a ".reg/999" section. */ 553 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 554 size, note->descpos + offset); 555 } 556 557 static bfd_boolean 558 cris_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 559 { 560 if (bfd_get_mach (abfd) == bfd_mach_cris_v32) 561 switch (note->descsz) 562 { 563 default: 564 return FALSE; 565 566 case 124: /* Linux/CRISv32 elf_prpsinfo */ 567 elf_tdata (abfd)->core->program 568 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 569 elf_tdata (abfd)->core->command 570 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 571 } 572 else 573 switch (note->descsz) 574 { 575 default: 576 return FALSE; 577 578 case 124: /* Linux/CRIS elf_prpsinfo */ 579 elf_tdata (abfd)->core->program 580 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 581 elf_tdata (abfd)->core->command 582 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 583 } 584 585 /* Note that for some reason, a spurious space is tacked 586 onto the end of the args in some (at least one anyway) 587 implementations, so strip it off if it exists. */ 588 589 { 590 char *command = elf_tdata (abfd)->core->command; 591 int n = strlen (command); 592 593 if (0 < n && command[n - 1] == ' ') 594 command[n - 1] = '\0'; 595 } 596 597 return TRUE; 598 } 599 600 /* The name of the dynamic interpreter. This is put in the .interp 601 section. */ 602 603 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 604 605 /* The size in bytes of an entry in the procedure linkage table. */ 606 607 #define PLT_ENTRY_SIZE 20 608 #define PLT_ENTRY_SIZE_V32 26 609 610 /* The first entry in an absolute procedure linkage table looks like this. */ 611 612 static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] = 613 { 614 0xfc, 0xe1, 615 0x7e, 0x7e, /* push mof. */ 616 0x7f, 0x0d, /* (dip [pc+]) */ 617 0, 0, 0, 0, /* Replaced with address of .got + 4. */ 618 0x30, 0x7a, /* move [...],mof */ 619 0x7f, 0x0d, /* (dip [pc+]) */ 620 0, 0, 0, 0, /* Replaced with address of .got + 8. */ 621 0x30, 0x09 /* jump [...] */ 622 }; 623 624 static const bfd_byte elf_cris_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = 625 { 626 0x84, 0xe2, /* subq 4,$sp */ 627 0x6f, 0xfe, /* move.d 0,$acr */ 628 0, 0, 0, 0, /* Replaced by address of .got + 4. */ 629 0x7e, 0x7a, /* move $mof,[$sp] */ 630 0x3f, 0x7a, /* move [$acr],$mof */ 631 0x04, 0xf2, /* addq 4,acr */ 632 0x6f, 0xfa, /* move.d [$acr],$acr */ 633 0xbf, 0x09, /* jump $acr */ 634 0xb0, 0x05, /* nop */ 635 0, 0 /* Pad out to 26 bytes. */ 636 }; 637 638 /* Subsequent entries in an absolute procedure linkage table look like 639 this. */ 640 641 static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] = 642 { 643 0x7f, 0x0d, /* (dip [pc+]) */ 644 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 645 0x30, 0x09, /* jump [...] */ 646 0x3f, 0x7e, /* move [pc+],mof */ 647 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 648 0x2f, 0xfe, /* add.d [pc+],pc */ 649 0xec, 0xff, 650 0xff, 0xff /* Replaced with offset to start of .plt. */ 651 }; 652 653 static const bfd_byte elf_cris_plt_entry_v32[PLT_ENTRY_SIZE_V32] = 654 { 655 0x6f, 0xfe, /* move.d 0,$acr */ 656 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 657 0x6f, 0xfa, /* move.d [$acr],$acr */ 658 0xbf, 0x09, /* jump $acr */ 659 0xb0, 0x05, /* nop */ 660 0x3f, 0x7e, /* move 0,mof */ 661 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 662 0xbf, 0x0e, /* ba start_of_plt0_entry */ 663 0, 0, 0, 0, /* Replaced with offset to plt0 entry. */ 664 0xb0, 0x05 /* nop */ 665 }; 666 667 /* The first entry in a PIC procedure linkage table looks like this. */ 668 669 static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] = 670 { 671 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */ 672 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */ 673 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */ 674 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */ 675 }; 676 677 static const bfd_byte elf_cris_pic_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = 678 { 679 0x84, 0xe2, /* subq 4,$sp */ 680 0x04, 0x01, /* addoq 4,$r0,$acr */ 681 0x7e, 0x7a, /* move $mof,[$sp] */ 682 0x3f, 0x7a, /* move [$acr],$mof */ 683 0x04, 0xf2, /* addq 4,$acr */ 684 0x6f, 0xfa, /* move.d [$acr],$acr */ 685 0xbf, 0x09, /* jump $acr */ 686 0xb0, 0x05, /* nop */ 687 0, 0, /* Pad out to 26 bytes. */ 688 0, 0, 0, 0, 689 0, 0, 0, 0 690 }; 691 692 /* Subsequent entries in a PIC procedure linkage table look like this. */ 693 694 static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] = 695 { 696 0x6f, 0x0d, /* (bdap [pc+].d,r0) */ 697 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 698 0x30, 0x09, /* jump [...] */ 699 0x3f, 0x7e, /* move [pc+],mof */ 700 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 701 0x2f, 0xfe, /* add.d [pc+],pc */ 702 0xec, 0xff, /* Replaced with offset to start of .plt. */ 703 0xff, 0xff 704 }; 705 706 static const bfd_byte elf_cris_pic_plt_entry_v32[PLT_ENTRY_SIZE_V32] = 707 { 708 0x6f, 0x0d, /* addo.d 0,$r0,$acr */ 709 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 710 0x6f, 0xfa, /* move.d [$acr],$acr */ 711 0xbf, 0x09, /* jump $acr */ 712 0xb0, 0x05, /* nop */ 713 0x3f, 0x7e, /* move relocoffs,$mof */ 714 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 715 0xbf, 0x0e, /* ba start_of_plt */ 716 0, 0, 0, 0, /* Replaced with offset to start of .plt. */ 717 0xb0, 0x05 /* nop */ 718 }; 719 720 /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits 721 (and most other PIC/shlib stuff). Check that we don't drift away 722 without reason. 723 724 The CRIS linker, like the m68k and i386 linkers (and probably the rest 725 too) needs to keep track of the number of relocs that it decides to 726 copy in check_relocs for each symbol. This is so that it can discard 727 PC relative relocs if it doesn't need them when linking with 728 -Bsymbolic. We store the information in a field extending the regular 729 ELF linker hash table. */ 730 731 /* This structure keeps track of the number of PC relative relocs we have 732 copied for a given symbol. */ 733 734 struct elf_cris_pcrel_relocs_copied 735 { 736 /* Next section. */ 737 struct elf_cris_pcrel_relocs_copied *next; 738 739 /* A section in dynobj. */ 740 asection *section; 741 742 /* Number of relocs copied in this section. */ 743 bfd_size_type count; 744 745 /* Example of reloc being copied, for message. */ 746 enum elf_cris_reloc_type r_type; 747 }; 748 749 /* CRIS ELF linker hash entry. */ 750 751 struct elf_cris_link_hash_entry 752 { 753 struct elf_link_hash_entry root; 754 755 /* Number of PC relative relocs copied for this symbol. */ 756 struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied; 757 758 /* The GOTPLT references are CRIS-specific; the goal is to avoid having 759 both a general GOT and a PLT-specific GOT entry for the same symbol, 760 when it is referenced both as a function and as a function pointer. 761 762 Number of GOTPLT references for a function. */ 763 bfd_signed_vma gotplt_refcount; 764 765 /* Actual GOTPLT index for this symbol, if applicable, or zero if not 766 (zero is never used as an index). FIXME: We should be able to fold 767 this with gotplt_refcount in a union, like the got and plt unions in 768 elf_link_hash_entry. */ 769 bfd_size_type gotplt_offset; 770 771 /* The root.got.refcount is the sum of the regular reference counts 772 (this) and those members below. We have to keep a separate count 773 to track when we've found the first (or last) reference to a 774 regular got entry. The offset is in root.got.offset. */ 775 bfd_signed_vma reg_got_refcount; 776 777 /* Similar to the above, the number of reloc references to this 778 symbols that need a R_CRIS_32_TPREL slot. The offset is in 779 root.got.offset, because this and .dtp_refcount can't validly 780 happen when there's also a regular GOT entry; that's invalid 781 input for which an error is emitted. */ 782 bfd_signed_vma tprel_refcount; 783 784 /* Similar to the above, the number of reloc references to this 785 symbols that need a R_CRIS_DTP slot. The offset is in 786 root.got.offset; plus 4 if .tprel_refcount > 0. */ 787 bfd_signed_vma dtp_refcount; 788 }; 789 790 static bfd_boolean 791 elf_cris_discard_excess_dso_dynamics (struct elf_cris_link_hash_entry *, 792 void * ); 793 static bfd_boolean 794 elf_cris_discard_excess_program_dynamics (struct elf_cris_link_hash_entry *, 795 void *); 796 797 /* The local_got_refcounts and local_got_offsets are a multiple of 798 LSNUM in size, namely LGOT_ALLOC_NELTS_FOR(LSNUM) (plus one for the 799 refcount for GOT itself, see code), with the summary / group offset 800 for local symbols located at offset N, reference counts for 801 ordinary (address) relocs at offset N + LSNUM, for R_CRIS_DTP 802 relocs at offset N + 2*LSNUM, and for R_CRIS_32_TPREL relocs at N + 803 3*LSNUM. */ 804 805 #define LGOT_REG_NDX(x) ((x) + symtab_hdr->sh_info) 806 #define LGOT_DTP_NDX(x) ((x) + 2 * symtab_hdr->sh_info) 807 #define LGOT_TPREL_NDX(x) ((x) + 3 * symtab_hdr->sh_info) 808 #define LGOT_ALLOC_NELTS_FOR(x) ((x) * 4) 809 810 /* CRIS ELF linker hash table. */ 811 812 struct elf_cris_link_hash_table 813 { 814 struct elf_link_hash_table root; 815 816 /* We can't use the PLT offset and calculate to get the GOTPLT offset, 817 since we try and avoid creating GOTPLT:s when there's already a GOT. 818 Instead, we keep and update the next available index here. */ 819 bfd_size_type next_gotplt_entry; 820 821 /* The number of R_CRIS_32_DTPREL and R_CRIS_16_DTPREL that have 822 been seen for any input; if != 0, then the constant-offset 823 R_CRIS_DTPMOD is needed for this DSO/executable. This turns 824 negative at relocation, so that we don't need an extra flag for 825 when the reloc is output. */ 826 bfd_signed_vma dtpmod_refcount; 827 }; 828 829 /* Traverse a CRIS ELF linker hash table. */ 830 831 #define elf_cris_link_hash_traverse(table, func, info) \ 832 (elf_link_hash_traverse \ 833 (&(table)->root, \ 834 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ 835 (info))) 836 837 /* Get the CRIS ELF linker hash table from a link_info structure. */ 838 839 #define elf_cris_hash_table(p) \ 840 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 841 == CRIS_ELF_DATA ? ((struct elf_cris_link_hash_table *) ((p)->hash)) : NULL) 842 843 /* Get the CRIS ELF linker hash entry from a regular hash entry (the 844 "parent class"). The .root reference is just a simple type 845 check on the argument. */ 846 847 #define elf_cris_hash_entry(p) \ 848 ((struct elf_cris_link_hash_entry *) (&(p)->root)) 849 850 /* Create an entry in a CRIS ELF linker hash table. */ 851 852 static struct bfd_hash_entry * 853 elf_cris_link_hash_newfunc (struct bfd_hash_entry *entry, 854 struct bfd_hash_table *table, 855 const char *string) 856 { 857 struct elf_cris_link_hash_entry *ret = 858 (struct elf_cris_link_hash_entry *) entry; 859 860 /* Allocate the structure if it has not already been allocated by a 861 subclass. */ 862 if (ret == (struct elf_cris_link_hash_entry *) NULL) 863 ret = ((struct elf_cris_link_hash_entry *) 864 bfd_hash_allocate (table, 865 sizeof (struct elf_cris_link_hash_entry))); 866 if (ret == (struct elf_cris_link_hash_entry *) NULL) 867 return (struct bfd_hash_entry *) ret; 868 869 /* Call the allocation method of the superclass. */ 870 ret = ((struct elf_cris_link_hash_entry *) 871 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 872 table, string)); 873 if (ret != (struct elf_cris_link_hash_entry *) NULL) 874 { 875 ret->pcrel_relocs_copied = NULL; 876 ret->gotplt_refcount = 0; 877 ret->gotplt_offset = 0; 878 ret->dtp_refcount = 0; 879 ret->tprel_refcount = 0; 880 ret->reg_got_refcount = 0; 881 } 882 883 return (struct bfd_hash_entry *) ret; 884 } 885 886 /* Create a CRIS ELF linker hash table. */ 887 888 static struct bfd_link_hash_table * 889 elf_cris_link_hash_table_create (bfd *abfd) 890 { 891 struct elf_cris_link_hash_table *ret; 892 bfd_size_type amt = sizeof (struct elf_cris_link_hash_table); 893 894 ret = ((struct elf_cris_link_hash_table *) bfd_zmalloc (amt)); 895 if (ret == (struct elf_cris_link_hash_table *) NULL) 896 return NULL; 897 898 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 899 elf_cris_link_hash_newfunc, 900 sizeof (struct elf_cris_link_hash_entry), 901 CRIS_ELF_DATA)) 902 { 903 free (ret); 904 return NULL; 905 } 906 907 /* Initialize to skip over the first three entries in the gotplt; they 908 are used for run-time symbol evaluation. */ 909 ret->next_gotplt_entry = 12; 910 911 return &ret->root.root; 912 } 913 914 /* Perform a single relocation. By default we use the standard BFD 915 routines, with a few tweaks. */ 916 917 static bfd_reloc_status_type 918 cris_final_link_relocate (reloc_howto_type * howto, 919 bfd * input_bfd, 920 asection * input_section, 921 bfd_byte * contents, 922 Elf_Internal_Rela * rel, 923 bfd_vma relocation) 924 { 925 bfd_reloc_status_type r; 926 enum elf_cris_reloc_type r_type = ELF32_R_TYPE (rel->r_info); 927 928 /* PC-relative relocations are relative to the position *after* 929 the reloc. Note that for R_CRIS_8_PCREL the adjustment is 930 not a single byte, since PC must be 16-bit-aligned. */ 931 switch (r_type) 932 { 933 /* Check that the 16-bit GOT relocs are positive. */ 934 case R_CRIS_16_GOTPLT: 935 case R_CRIS_16_GOT: 936 if ((bfd_signed_vma) relocation < 0) 937 return bfd_reloc_overflow; 938 break; 939 940 case R_CRIS_32_PLT_PCREL: 941 case R_CRIS_32_PCREL: 942 relocation -= 2; 943 /* Fall through. */ 944 case R_CRIS_8_PCREL: 945 case R_CRIS_16_PCREL: 946 relocation -= 2; 947 break; 948 949 default: 950 break; 951 } 952 953 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 954 contents, rel->r_offset, 955 relocation, rel->r_addend); 956 return r; 957 } 958 959 960 /* The number of errors left before we stop outputting reloc-specific 961 explanatory messages. By coincidence, this works nicely together 962 with the default number of messages you'll get from LD about 963 "relocation truncated to fit" messages before you get an 964 "additional relocation overflows omitted from the output". */ 965 static int additional_relocation_error_msg_count = 10; 966 967 /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was 968 copied, for further comments. */ 969 970 static bfd_boolean 971 cris_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 972 struct bfd_link_info *info, 973 bfd *input_bfd, 974 asection *input_section, 975 bfd_byte *contents, 976 Elf_Internal_Rela *relocs, 977 Elf_Internal_Sym *local_syms, 978 asection **local_sections) 979 { 980 struct elf_cris_link_hash_table * htab; 981 bfd *dynobj; 982 Elf_Internal_Shdr *symtab_hdr; 983 struct elf_link_hash_entry **sym_hashes; 984 bfd_vma *local_got_offsets; 985 asection *sgot; 986 asection *splt; 987 asection *sreloc; 988 Elf_Internal_Rela *rel; 989 Elf_Internal_Rela *relend; 990 asection *srelgot; 991 992 htab = elf_cris_hash_table (info); 993 if (htab == NULL) 994 return FALSE; 995 996 dynobj = htab->root.dynobj; 997 local_got_offsets = elf_local_got_offsets (input_bfd); 998 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 999 sym_hashes = elf_sym_hashes (input_bfd); 1000 relend = relocs + input_section->reloc_count; 1001 1002 sgot = NULL; 1003 splt = NULL; 1004 sreloc = NULL; 1005 srelgot = NULL; 1006 1007 if (dynobj != NULL) 1008 { 1009 splt = htab->root.splt; 1010 sgot = htab->root.sgot; 1011 } 1012 1013 for (rel = relocs; rel < relend; rel ++) 1014 { 1015 reloc_howto_type *howto; 1016 unsigned long r_symndx; 1017 Elf_Internal_Sym *sym; 1018 asection *sec; 1019 struct elf_link_hash_entry *h; 1020 bfd_vma relocation; 1021 bfd_reloc_status_type r; 1022 const char *symname = NULL; 1023 enum elf_cris_reloc_type r_type; 1024 bfd_boolean resolved_to_zero; 1025 1026 r_type = ELF32_R_TYPE (rel->r_info); 1027 1028 if ( r_type == R_CRIS_GNU_VTINHERIT 1029 || r_type == R_CRIS_GNU_VTENTRY) 1030 continue; 1031 1032 r_symndx = ELF32_R_SYM (rel->r_info); 1033 howto = cris_elf_howto_table + r_type; 1034 h = NULL; 1035 sym = NULL; 1036 sec = NULL; 1037 1038 if (r_symndx < symtab_hdr->sh_info) 1039 { 1040 sym = local_syms + r_symndx; 1041 sec = local_sections [r_symndx]; 1042 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1043 1044 symname = (bfd_elf_string_from_elf_section 1045 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 1046 if (symname == NULL) 1047 symname = bfd_section_name (input_bfd, sec); 1048 } 1049 else 1050 { 1051 bfd_boolean warned, ignored; 1052 bfd_boolean unresolved_reloc; 1053 1054 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1055 r_symndx, symtab_hdr, sym_hashes, 1056 h, sec, relocation, 1057 unresolved_reloc, warned, ignored); 1058 1059 symname = h->root.root.string; 1060 1061 if (unresolved_reloc 1062 /* Perhaps we should detect the cases that 1063 sec->output_section is expected to be NULL like i386 and 1064 m68k, but apparently (and according to elfxx-ia64.c) all 1065 valid cases are where the symbol is defined in a shared 1066 object which we link dynamically against. This includes 1067 PLT relocs for which we've created a PLT entry and other 1068 relocs for which we're prepared to create dynamic 1069 relocations. 1070 1071 For now, new situations cause us to just err when 1072 sec->output_offset is NULL but the object with the symbol 1073 is *not* dynamically linked against. Thus this will 1074 automatically remind us so we can see if there are other 1075 valid cases we need to revisit. */ 1076 && (sec->owner->flags & DYNAMIC) != 0) 1077 relocation = 0; 1078 1079 else if (h->root.type == bfd_link_hash_defined 1080 || h->root.type == bfd_link_hash_defweak) 1081 { 1082 /* Here follow the cases where the relocation value must 1083 be zero (or when further handling is simplified when 1084 zero). I can't claim to understand the various 1085 conditions and they weren't described in the files 1086 where I copied them from (elf32-m68k.c and 1087 elf32-i386.c), but let's mention examples of where 1088 they happen. FIXME: Perhaps define and use a 1089 dynamic_symbol_p function like ia64. 1090 1091 - When creating a shared library, we can have an 1092 ordinary relocation for a symbol defined in a shared 1093 library (perhaps the one we create). We then make 1094 the relocation value zero, as the value seen now will 1095 be added into the relocation addend in this shared 1096 library, but must be handled only at dynamic-link 1097 time. FIXME: Not sure this example covers the 1098 h->elf_link_hash_flags test, though it's there in 1099 other targets. */ 1100 if (bfd_link_pic (info) 1101 && ((!SYMBOLIC_BIND (info, h) && h->dynindx != -1) 1102 || !h->def_regular) 1103 && (input_section->flags & SEC_ALLOC) != 0 1104 && (r_type == R_CRIS_8 1105 || r_type == R_CRIS_16 1106 || r_type == R_CRIS_32 1107 || r_type == R_CRIS_8_PCREL 1108 || r_type == R_CRIS_16_PCREL 1109 || r_type == R_CRIS_32_PCREL)) 1110 relocation = 0; 1111 else if (!bfd_link_relocatable (info) && unresolved_reloc 1112 && (_bfd_elf_section_offset (output_bfd, info, 1113 input_section, 1114 rel->r_offset) 1115 != (bfd_vma) -1)) 1116 { 1117 _bfd_error_handler 1118 /* xgettext:c-format */ 1119 (_("%pB, section %pA: unresolvable relocation %s against symbol `%s'"), 1120 input_bfd, 1121 input_section, 1122 cris_elf_howto_table[r_type].name, 1123 symname); 1124 bfd_set_error (bfd_error_bad_value); 1125 return FALSE; 1126 } 1127 } 1128 } 1129 1130 if (sec != NULL && discarded_section (sec)) 1131 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1132 rel, 1, relend, howto, 0, contents); 1133 1134 if (bfd_link_relocatable (info)) 1135 continue; 1136 1137 resolved_to_zero = (h != NULL 1138 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); 1139 1140 switch (r_type) 1141 { 1142 case R_CRIS_16_GOTPLT: 1143 case R_CRIS_32_GOTPLT: 1144 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT, 1145 but we require a PLT, and the PLT handling will take care of 1146 filling in the PLT-specific GOT entry. For the GOT offset, 1147 calculate it as we do when filling it in for the .got.plt 1148 section. If we don't have a PLT, punt to GOT handling. */ 1149 if (h != NULL 1150 && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0) 1151 { 1152 asection *sgotplt = htab->root.sgotplt; 1153 bfd_vma got_offset; 1154 1155 BFD_ASSERT (h->dynindx != -1); 1156 BFD_ASSERT (sgotplt != NULL); 1157 1158 got_offset 1159 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; 1160 1161 relocation = got_offset; 1162 break; 1163 } 1164 1165 /* We didn't make a PLT entry for this symbol. Maybe everything is 1166 folded into the GOT. Other than folding, this happens when 1167 statically linking PIC code, or when using -Bsymbolic. Check 1168 that we instead have a GOT entry as done for us by 1169 elf_cris_adjust_dynamic_symbol, and drop through into the 1170 ordinary GOT cases. This must not happen for the 1171 executable, because any reference it does to a function 1172 that is satisfied by a DSO must generate a PLT. We assume 1173 these call-specific relocs don't address non-functions. */ 1174 if (h != NULL 1175 && (h->got.offset == (bfd_vma) -1 1176 || (!bfd_link_pic (info) 1177 && !(h->def_regular 1178 || (!h->def_dynamic 1179 && h->root.type == bfd_link_hash_undefweak))))) 1180 { 1181 _bfd_error_handler 1182 ((h->got.offset == (bfd_vma) -1) 1183 /* xgettext:c-format */ 1184 ? _("%pB, section %pA: no PLT nor GOT for relocation %s" 1185 " against symbol `%s'") 1186 /* xgettext:c-format */ 1187 : _("%pB, section %pA: no PLT for relocation %s" 1188 " against symbol `%s'"), 1189 input_bfd, 1190 input_section, 1191 cris_elf_howto_table[r_type].name, 1192 (symname != NULL && symname[0] != '\0' 1193 ? symname : _("[whose name is lost]"))); 1194 1195 /* FIXME: Perhaps blaming input is not the right thing to 1196 do; this is probably an internal error. But it is true 1197 that we didn't like that particular input. */ 1198 bfd_set_error (bfd_error_bad_value); 1199 return FALSE; 1200 } 1201 /* Fall through. */ 1202 1203 /* The size of the actual relocation is not used here; we only 1204 fill in the GOT table here. */ 1205 case R_CRIS_16_GOT: 1206 case R_CRIS_32_GOT: 1207 { 1208 bfd_vma off; 1209 1210 /* Note that despite using RELA relocations, the .got contents 1211 is always filled in with the link-relative relocation 1212 value; the addend. */ 1213 1214 if (h != NULL) 1215 { 1216 off = h->got.offset; 1217 BFD_ASSERT (off != (bfd_vma) -1); 1218 1219 if (!elf_hash_table (info)->dynamic_sections_created 1220 || (! bfd_link_pic (info) 1221 && (h->def_regular 1222 || h->type == STT_FUNC 1223 || h->needs_plt)) 1224 || (bfd_link_pic (info) 1225 && (SYMBOLIC_BIND (info, h) || h->dynindx == -1) 1226 && h->def_regular)) 1227 { 1228 /* This wasn't checked above for ! bfd_link_pic (info), but 1229 must hold there if we get here; the symbol must 1230 be defined in the regular program or be undefweak 1231 or be a function or otherwise need a PLT. */ 1232 BFD_ASSERT (!elf_hash_table (info)->dynamic_sections_created 1233 || bfd_link_pic (info) 1234 || h->def_regular 1235 || h->type == STT_FUNC 1236 || h->needs_plt 1237 || h->root.type == bfd_link_hash_undefweak); 1238 1239 /* This is actually a static link, or it is a 1240 -Bsymbolic link and the symbol is defined locally, 1241 or is undefweak, or the symbol was forced to be 1242 local because of a version file, or we're not 1243 creating a dynamic object. We must initialize this 1244 entry in the global offset table. Since the offset 1245 must always be a multiple of 4, we use the least 1246 significant bit to record whether we have 1247 initialized it already. 1248 1249 If this GOT entry should be runtime-initialized, we 1250 will create a .rela.got relocation entry to 1251 initialize the value. This is done in the 1252 finish_dynamic_symbol routine. */ 1253 if ((off & 1) != 0) 1254 off &= ~1; 1255 else 1256 { 1257 bfd_put_32 (output_bfd, relocation, 1258 sgot->contents + off); 1259 h->got.offset |= 1; 1260 } 1261 } 1262 } 1263 else 1264 { 1265 BFD_ASSERT (local_got_offsets != NULL 1266 && local_got_offsets[r_symndx] != (bfd_vma) -1); 1267 1268 off = local_got_offsets[r_symndx]; 1269 1270 /* The offset must always be a multiple of 4. We use 1271 the least significant bit to record whether we have 1272 already generated the necessary reloc. */ 1273 if ((off & 1) != 0) 1274 off &= ~1; 1275 else 1276 { 1277 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1278 1279 if (bfd_link_pic (info)) 1280 { 1281 Elf_Internal_Rela outrel; 1282 bfd_byte *loc; 1283 1284 srelgot = htab->root.srelgot; 1285 BFD_ASSERT (srelgot != NULL); 1286 1287 outrel.r_offset = (sgot->output_section->vma 1288 + sgot->output_offset 1289 + off); 1290 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1291 outrel.r_addend = relocation; 1292 loc = srelgot->contents; 1293 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 1294 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1295 } 1296 1297 local_got_offsets[r_symndx] |= 1; 1298 } 1299 } 1300 1301 relocation = sgot->output_offset + off; 1302 if (rel->r_addend != 0) 1303 { 1304 /* We can't do anything for a relocation which is against 1305 a symbol *plus offset*. GOT holds relocations for 1306 symbols. Make this an error; the compiler isn't 1307 allowed to pass us these kinds of things. */ 1308 if (h == NULL) 1309 _bfd_error_handler 1310 /* xgettext:c-format */ 1311 (_("%pB, section %pA: relocation %s with non-zero addend" 1312 " %" PRId64 " against local symbol"), 1313 input_bfd, 1314 input_section, 1315 cris_elf_howto_table[r_type].name, 1316 (int64_t) rel->r_addend); 1317 else 1318 _bfd_error_handler 1319 /* xgettext:c-format */ 1320 (_("%pB, section %pA: relocation %s with non-zero addend" 1321 " %" PRId64 " against symbol `%s'"), 1322 input_bfd, 1323 input_section, 1324 cris_elf_howto_table[r_type].name, 1325 (int64_t) rel->r_addend, 1326 symname[0] != '\0' ? symname : _("[whose name is lost]")); 1327 1328 bfd_set_error (bfd_error_bad_value); 1329 return FALSE; 1330 } 1331 } 1332 break; 1333 1334 case R_CRIS_32_GOTREL: 1335 /* This relocation must only be performed against local symbols. 1336 It's also ok when we link a program and the symbol is either 1337 defined in an ordinary (non-DSO) object or is undefined weak. */ 1338 if (h != NULL 1339 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1340 && !(!bfd_link_pic (info) 1341 && (h->def_regular 1342 || (!h->def_dynamic 1343 && h->root.type == bfd_link_hash_undefweak)))) 1344 { 1345 _bfd_error_handler 1346 /* xgettext:c-format */ 1347 (_("%pB, section %pA: relocation %s is" 1348 " not allowed for global symbol: `%s'"), 1349 input_bfd, 1350 input_section, 1351 cris_elf_howto_table[r_type].name, 1352 symname); 1353 bfd_set_error (bfd_error_bad_value); 1354 return FALSE; 1355 } 1356 1357 /* This can happen if we get a link error with the input ELF 1358 variant mismatching the output variant. Emit an error so 1359 it's noticed if it happens elsewhere. */ 1360 if (sgot == NULL) 1361 { 1362 _bfd_error_handler 1363 /* xgettext:c-format */ 1364 (_("%pB, section %pA: relocation %s with no GOT created"), 1365 input_bfd, 1366 input_section, 1367 cris_elf_howto_table[r_type].name); 1368 bfd_set_error (bfd_error_bad_value); 1369 return FALSE; 1370 } 1371 1372 /* This relocation is like a PC-relative one, except the 1373 reference point is the location of GOT. Note that 1374 sgot->output_offset is not involved in this calculation. We 1375 always want the start of entire .got section, not the 1376 position after the reserved header. */ 1377 relocation -= sgot->output_section->vma; 1378 break; 1379 1380 case R_CRIS_32_PLT_PCREL: 1381 /* Relocation is to the entry for this symbol in the 1382 procedure linkage table. */ 1383 1384 /* Resolve a PLT_PCREL reloc against a local symbol directly, 1385 without using the procedure linkage table. */ 1386 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1387 break; 1388 1389 if (h->plt.offset == (bfd_vma) -1 1390 || splt == NULL) 1391 { 1392 /* We didn't make a PLT entry for this symbol. This 1393 happens when statically linking PIC code, or when 1394 using -Bsymbolic. */ 1395 break; 1396 } 1397 1398 relocation = (splt->output_section->vma 1399 + splt->output_offset 1400 + h->plt.offset); 1401 break; 1402 1403 case R_CRIS_32_PLT_GOTREL: 1404 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the 1405 start of the .got section. See also comment at 1406 R_CRIS_32_GOT. */ 1407 relocation -= sgot->output_section->vma; 1408 1409 /* Resolve a PLT_GOTREL reloc against a local symbol directly, 1410 without using the procedure linkage table. */ 1411 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1412 break; 1413 1414 if (h->plt.offset == (bfd_vma) -1 1415 || splt == NULL) 1416 { 1417 /* We didn't make a PLT entry for this symbol. This 1418 happens when statically linking PIC code, or when 1419 using -Bsymbolic. */ 1420 break; 1421 } 1422 1423 relocation = (splt->output_section->vma 1424 + splt->output_offset 1425 + h->plt.offset 1426 - sgot->output_section->vma); 1427 break; 1428 1429 case R_CRIS_8_PCREL: 1430 case R_CRIS_16_PCREL: 1431 case R_CRIS_32_PCREL: 1432 /* If the symbol was local, we need no shlib-specific handling. */ 1433 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1434 || h->dynindx == -1) 1435 break; 1436 1437 /* Fall through. */ 1438 case R_CRIS_8: 1439 case R_CRIS_16: 1440 case R_CRIS_32: 1441 if (bfd_link_pic (info) 1442 && !resolved_to_zero 1443 && r_symndx != STN_UNDEF 1444 && (input_section->flags & SEC_ALLOC) != 0 1445 && ((r_type != R_CRIS_8_PCREL 1446 && r_type != R_CRIS_16_PCREL 1447 && r_type != R_CRIS_32_PCREL) 1448 || (!SYMBOLIC_BIND (info, h) 1449 || (h != NULL && !h->def_regular)))) 1450 { 1451 Elf_Internal_Rela outrel; 1452 bfd_byte *loc; 1453 bfd_boolean skip, relocate; 1454 1455 /* When generating a shared object, these relocations 1456 are copied into the output file to be resolved at run 1457 time. */ 1458 1459 if (sreloc == NULL) 1460 { 1461 sreloc = _bfd_elf_get_dynamic_reloc_section 1462 (dynobj, input_section, /*rela?*/ TRUE); 1463 /* The section should have been created in cris_elf_check_relocs, 1464 but that function will not be called for objects which fail in 1465 cris_elf_merge_private_bfd_data. */ 1466 if (sreloc == NULL) 1467 { 1468 bfd_set_error (bfd_error_bad_value); 1469 return FALSE; 1470 } 1471 } 1472 1473 skip = FALSE; 1474 relocate = FALSE; 1475 1476 outrel.r_offset = 1477 _bfd_elf_section_offset (output_bfd, info, input_section, 1478 rel->r_offset); 1479 if (outrel.r_offset == (bfd_vma) -1) 1480 skip = TRUE; 1481 else if (outrel.r_offset == (bfd_vma) -2 1482 /* For now, undefined weak symbols with non-default 1483 visibility (yielding 0), like exception info for 1484 discarded sections, will get a R_CRIS_NONE 1485 relocation rather than no relocation, because we 1486 notice too late that the symbol doesn't need a 1487 relocation. */ 1488 || (h != NULL 1489 && h->root.type == bfd_link_hash_undefweak 1490 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)) 1491 skip = TRUE, relocate = TRUE; 1492 outrel.r_offset += (input_section->output_section->vma 1493 + input_section->output_offset); 1494 1495 if (skip) 1496 memset (&outrel, 0, sizeof outrel); 1497 /* h->dynindx may be -1 if the symbol was marked to 1498 become local. */ 1499 else if (h != NULL 1500 && ((!SYMBOLIC_BIND (info, h) && h->dynindx != -1) 1501 || !h->def_regular)) 1502 { 1503 BFD_ASSERT (h->dynindx != -1); 1504 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1505 outrel.r_addend = relocation + rel->r_addend; 1506 } 1507 else 1508 { 1509 outrel.r_addend = relocation + rel->r_addend; 1510 1511 if (r_type == R_CRIS_32) 1512 { 1513 relocate = TRUE; 1514 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1515 } 1516 else 1517 { 1518 long indx; 1519 1520 if (bfd_is_abs_section (sec)) 1521 indx = 0; 1522 else if (sec == NULL || sec->owner == NULL) 1523 { 1524 bfd_set_error (bfd_error_bad_value); 1525 return FALSE; 1526 } 1527 else 1528 { 1529 asection *osec; 1530 1531 /* We are turning this relocation into one 1532 against a section symbol. It would be 1533 proper to subtract the symbol's value, 1534 osec->vma, from the emitted reloc addend, 1535 but ld.so expects buggy relocs. */ 1536 osec = sec->output_section; 1537 indx = elf_section_data (osec)->dynindx; 1538 if (indx == 0) 1539 { 1540 osec = htab->root.text_index_section; 1541 indx = elf_section_data (osec)->dynindx; 1542 } 1543 BFD_ASSERT (indx != 0); 1544 } 1545 1546 outrel.r_info = ELF32_R_INFO (indx, r_type); 1547 } 1548 } 1549 1550 loc = sreloc->contents; 1551 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1552 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1553 1554 /* This reloc will be computed at runtime, so there's no 1555 need to do anything now, except for R_CRIS_32 relocations 1556 that have been turned into R_CRIS_RELATIVE. */ 1557 if (!relocate) 1558 continue; 1559 } 1560 1561 break; 1562 1563 case R_CRIS_16_DTPREL: 1564 case R_CRIS_32_DTPREL: 1565 /* This relocation must only be performed against local 1566 symbols, or to sections that are not loadable. It's also 1567 ok when we link a program and the symbol is defined in an 1568 ordinary (non-DSO) object (if it's undefined there, we've 1569 already seen an error). */ 1570 if (h != NULL 1571 && (input_section->flags & SEC_ALLOC) != 0 1572 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1573 && (bfd_link_pic (info) 1574 || (!h->def_regular 1575 && h->root.type != bfd_link_hash_undefined))) 1576 { 1577 _bfd_error_handler 1578 ((h->root.type == bfd_link_hash_undefined) 1579 /* We shouldn't get here for GCC-emitted code. */ 1580 /* xgettext:c-format */ 1581 ? _("%pB, section %pA: relocation %s has an undefined" 1582 " reference to `%s', perhaps a declaration mixup?") 1583 /* xgettext:c-format */ 1584 : _("%pB, section %pA: relocation %s is" 1585 " not allowed for `%s', a global symbol with default" 1586 " visibility, perhaps a declaration mixup?"), 1587 input_bfd, 1588 input_section, 1589 cris_elf_howto_table[r_type].name, 1590 symname != NULL && symname[0] != '\0' 1591 ? symname : _("[whose name is lost]")); 1592 bfd_set_error (bfd_error_bad_value); 1593 return FALSE; 1594 } 1595 1596 BFD_ASSERT ((input_section->flags & SEC_ALLOC) == 0 1597 || htab->dtpmod_refcount != 0); 1598 1599 /* Fill in a R_CRIS_DTPMOD reloc at offset 3 if we haven't 1600 already done so. Note that we do this in .got.plt, not 1601 in .got, as .got.plt contains the first part, still the 1602 reloc is against .got, because the linker script directs 1603 (is required to direct) them both into .got. */ 1604 if (htab->dtpmod_refcount > 0 1605 && (input_section->flags & SEC_ALLOC) != 0) 1606 { 1607 asection *sgotplt = htab->root.sgotplt; 1608 BFD_ASSERT (sgotplt != NULL); 1609 1610 if (bfd_link_pic (info)) 1611 { 1612 Elf_Internal_Rela outrel; 1613 bfd_byte *loc; 1614 1615 srelgot = htab->root.srelgot; 1616 BFD_ASSERT (srelgot != NULL); 1617 loc = srelgot->contents; 1618 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 1619 1620 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 12); 1621 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 16); 1622 outrel.r_offset = (sgotplt->output_section->vma 1623 + sgotplt->output_offset 1624 + 12); 1625 outrel.r_info = ELF32_R_INFO (0, R_CRIS_DTPMOD); 1626 outrel.r_addend = 0; 1627 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1628 } 1629 else 1630 { 1631 /* For an executable, the GOT entry contents is known. */ 1632 bfd_put_32 (output_bfd, (bfd_vma) 1, sgotplt->contents + 12); 1633 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 16); 1634 } 1635 1636 /* Reverse the sign to mark that we've emitted the 1637 required GOT entry. */ 1638 htab->dtpmod_refcount = - htab->dtpmod_refcount; 1639 } 1640 1641 /* The relocation is the offset from the start of the module 1642 TLS block to the (local) symbol. */ 1643 relocation -= elf_hash_table (info)->tls_sec == NULL 1644 ? 0 : elf_hash_table (info)->tls_sec->vma; 1645 break; 1646 1647 case R_CRIS_32_GD: 1648 if (bfd_link_pic (info)) 1649 { 1650 bfd_set_error (bfd_error_invalid_operation); 1651 1652 /* We've already informed in cris_elf_check_relocs that 1653 this is an error. */ 1654 return FALSE; 1655 } 1656 /* Fall through. */ 1657 1658 case R_CRIS_16_GOT_GD: 1659 case R_CRIS_32_GOT_GD: 1660 if (rel->r_addend != 0) 1661 { 1662 /* We can't do anything for a relocation which is against a 1663 symbol *plus offset*. The GOT holds relocations for 1664 symbols. Make this an error; the compiler isn't allowed 1665 to pass us these kinds of things. */ 1666 _bfd_error_handler 1667 /* xgettext:c-format */ 1668 (_("%pB, section %pA: relocation %s with non-zero addend" 1669 " %" PRId64 " against symbol `%s'"), 1670 input_bfd, 1671 input_section, 1672 cris_elf_howto_table[r_type].name, 1673 (int64_t) rel->r_addend, 1674 symname[0] != '\0' ? symname : _("[whose name is lost]")); 1675 1676 bfd_set_error (bfd_error_bad_value); 1677 return FALSE; 1678 } 1679 1680 if (!bfd_link_pic (info) 1681 && (h == NULL || h->def_regular || ELF_COMMON_DEF_P (h))) 1682 { 1683 /* Known contents of the GOT. */ 1684 bfd_vma off; 1685 1686 /* The symbol is defined in the program, so just write 1687 (1, known_tpoffset) into the GOT. */ 1688 relocation -= elf_hash_table (info)->tls_sec->vma; 1689 1690 if (h != NULL) 1691 { 1692 off = elf_cris_hash_entry (h)->tprel_refcount > 0 1693 ? h->got.offset + 4 : h->got.offset; 1694 } 1695 else 1696 { 1697 off = local_got_offsets[r_symndx]; 1698 if (local_got_offsets[LGOT_TPREL_NDX (r_symndx)]) 1699 off += 4; 1700 } 1701 1702 /* We use bit 1 of the offset as a flag for GOT entry with 1703 the R_CRIS_DTP reloc, setting it when we've emitted the 1704 GOT entry and reloc. Bit 0 is used for R_CRIS_32_TPREL 1705 relocs. */ 1706 if ((off & 2) == 0) 1707 { 1708 off &= ~3; 1709 1710 if (h != NULL) 1711 h->got.offset |= 2; 1712 else 1713 local_got_offsets[r_symndx] |= 2; 1714 1715 bfd_put_32 (output_bfd, 1, sgot->contents + off); 1716 bfd_put_32 (output_bfd, relocation, sgot->contents + off + 4); 1717 } 1718 else 1719 off &= ~3; 1720 1721 relocation = sgot->output_offset + off 1722 + (r_type == R_CRIS_32_GD ? sgot->output_section->vma : 0); 1723 } 1724 else 1725 { 1726 /* Not all parts of the GOT entry are known; emit a real 1727 relocation. */ 1728 bfd_vma off; 1729 1730 if (h != NULL) 1731 off = elf_cris_hash_entry (h)->tprel_refcount > 0 1732 ? h->got.offset + 4 : h->got.offset; 1733 else 1734 { 1735 off = local_got_offsets[r_symndx]; 1736 if (local_got_offsets[LGOT_TPREL_NDX (r_symndx)]) 1737 off += 4; 1738 } 1739 1740 /* See above re bit 1 and bit 0 usage. */ 1741 if ((off & 2) == 0) 1742 { 1743 Elf_Internal_Rela outrel; 1744 bfd_byte *loc; 1745 1746 off &= ~3; 1747 1748 if (h != NULL) 1749 h->got.offset |= 2; 1750 else 1751 local_got_offsets[r_symndx] |= 2; 1752 1753 /* Clear the target contents of the GOT (just as a 1754 gesture; it's already cleared on allocation): this 1755 relocation is not like the other dynrelocs. */ 1756 bfd_put_32 (output_bfd, 0, sgot->contents + off); 1757 bfd_put_32 (output_bfd, 0, sgot->contents + off + 4); 1758 1759 srelgot = htab->root.srelgot; 1760 BFD_ASSERT (srelgot != NULL); 1761 1762 if (h != NULL && h->dynindx != -1) 1763 { 1764 outrel.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_DTP); 1765 relocation = 0; 1766 } 1767 else 1768 { 1769 outrel.r_info = ELF32_R_INFO (0, R_CRIS_DTP); 1770 1771 /* NULL if we had an error. */ 1772 relocation -= elf_hash_table (info)->tls_sec == NULL 1773 ? 0 : elf_hash_table (info)->tls_sec->vma; 1774 } 1775 1776 outrel.r_offset = (sgot->output_section->vma 1777 + sgot->output_offset 1778 + off); 1779 outrel.r_addend = relocation; 1780 loc = srelgot->contents; 1781 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 1782 1783 /* NULL if we had an error. */ 1784 if (srelgot->contents != NULL) 1785 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1786 } 1787 else 1788 off &= ~3; 1789 1790 relocation = sgot->output_offset + off 1791 + (r_type == R_CRIS_32_GD ? sgot->output_section->vma : 0); 1792 } 1793 1794 /* The GOT-relative offset to the GOT entry is the 1795 relocation, or for R_CRIS_32_GD, the actual address of 1796 the GOT entry. */ 1797 break; 1798 1799 case R_CRIS_32_IE: 1800 if (bfd_link_pic (info)) 1801 { 1802 bfd_set_error (bfd_error_invalid_operation); 1803 1804 /* We've already informed in cris_elf_check_relocs that 1805 this is an error. */ 1806 return FALSE; 1807 } 1808 /* Fall through. */ 1809 1810 case R_CRIS_32_GOT_TPREL: 1811 case R_CRIS_16_GOT_TPREL: 1812 if (rel->r_addend != 0) 1813 { 1814 /* We can't do anything for a relocation which is 1815 against a symbol *plus offset*. GOT holds 1816 relocations for symbols. Make this an error; the 1817 compiler isn't allowed to pass us these kinds of 1818 things. */ 1819 _bfd_error_handler 1820 /* xgettext:c-format */ 1821 (_("%pB, section %pA: relocation %s with non-zero addend" 1822 " %" PRId64 " against symbol `%s'"), 1823 input_bfd, 1824 input_section, 1825 cris_elf_howto_table[r_type].name, 1826 (int64_t) rel->r_addend, 1827 symname[0] != '\0' ? symname : _("[whose name is lost]")); 1828 bfd_set_error (bfd_error_bad_value); 1829 return FALSE; 1830 } 1831 1832 if (!bfd_link_pic (info) 1833 && (h == NULL || h->def_regular || ELF_COMMON_DEF_P (h))) 1834 { 1835 /* Known contents of the GOT. */ 1836 bfd_vma off; 1837 1838 /* The symbol is defined in the program, so just write 1839 the -prog_tls_size+known_tpoffset into the GOT. */ 1840 relocation -= elf_hash_table (info)->tls_sec->vma; 1841 relocation -= elf_hash_table (info)->tls_size; 1842 1843 if (h != NULL) 1844 off = h->got.offset; 1845 else 1846 off = local_got_offsets[r_symndx]; 1847 1848 /* Bit 0 is used to mark whether we've emitted the required 1849 entry (and if needed R_CRIS_32_TPREL reloc). Bit 1 1850 is used similarly for R_CRIS_DTP, see above. */ 1851 if ((off & 1) == 0) 1852 { 1853 off &= ~3; 1854 1855 if (h != NULL) 1856 h->got.offset |= 1; 1857 else 1858 local_got_offsets[r_symndx] |= 1; 1859 1860 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1861 } 1862 else 1863 off &= ~3; 1864 1865 relocation = sgot->output_offset + off 1866 + (r_type == R_CRIS_32_IE ? sgot->output_section->vma : 0); 1867 } 1868 else 1869 { 1870 /* Emit a real relocation. */ 1871 bfd_vma off; 1872 1873 if (h != NULL) 1874 off = h->got.offset; 1875 else 1876 off = local_got_offsets[r_symndx]; 1877 1878 /* See above re usage of bit 0 and 1. */ 1879 if ((off & 1) == 0) 1880 { 1881 Elf_Internal_Rela outrel; 1882 bfd_byte *loc; 1883 1884 off &= ~3; 1885 1886 if (h != NULL) 1887 h->got.offset |= 1; 1888 else 1889 local_got_offsets[r_symndx] |= 1; 1890 1891 srelgot = htab->root.srelgot; 1892 BFD_ASSERT (srelgot != NULL); 1893 1894 if (h != NULL && h->dynindx != -1) 1895 { 1896 outrel.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_32_TPREL); 1897 relocation = 0; 1898 } 1899 else 1900 { 1901 outrel.r_info = ELF32_R_INFO (0, R_CRIS_32_TPREL); 1902 1903 /* NULL if we had an error. */ 1904 relocation -= elf_hash_table (info)->tls_sec == NULL 1905 ? 0 : elf_hash_table (info)->tls_sec->vma; 1906 } 1907 1908 /* Just "define" the initial contents in some 1909 semi-logical way. */ 1910 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1911 1912 outrel.r_offset = (sgot->output_section->vma 1913 + sgot->output_offset 1914 + off); 1915 outrel.r_addend = relocation; 1916 loc = srelgot->contents; 1917 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 1918 /* NULL if we had an error. */ 1919 if (srelgot->contents != NULL) 1920 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1921 } 1922 else 1923 off &= ~3; 1924 1925 relocation = sgot->output_offset + off 1926 + (r_type == R_CRIS_32_IE ? sgot->output_section->vma : 0); 1927 } 1928 1929 /* The GOT-relative offset to the GOT entry is the relocation, 1930 or for R_CRIS_32_GD, the actual address of the GOT entry. */ 1931 break; 1932 1933 case R_CRIS_16_TPREL: 1934 case R_CRIS_32_TPREL: 1935 /* This relocation must only be performed against symbols 1936 defined in an ordinary (non-DSO) object. */ 1937 if (bfd_link_pic (info)) 1938 { 1939 bfd_set_error (bfd_error_invalid_operation); 1940 1941 /* We've already informed in cris_elf_check_relocs that 1942 this is an error. */ 1943 return FALSE; 1944 } 1945 1946 if (h != NULL 1947 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1948 && !(h->def_regular || ELF_COMMON_DEF_P (h)) 1949 /* If it's undefined, then an error message has already 1950 been emitted. */ 1951 && h->root.type != bfd_link_hash_undefined) 1952 { 1953 _bfd_error_handler 1954 /* xgettext:c-format */ 1955 (_("%pB, section %pA: relocation %s is" 1956 " not allowed for symbol: `%s'" 1957 " which is defined outside the program," 1958 " perhaps a declaration mixup?"), 1959 input_bfd, 1960 input_section, 1961 cris_elf_howto_table[r_type].name, 1962 symname); 1963 bfd_set_error (bfd_error_bad_value); 1964 return FALSE; 1965 } 1966 1967 /* NULL if we had an error. */ 1968 relocation -= elf_hash_table (info)->tls_sec == NULL 1969 ? 0 1970 : (elf_hash_table (info)->tls_sec->vma 1971 + elf_hash_table (info)->tls_size); 1972 1973 /* The TLS-relative offset is the relocation. */ 1974 break; 1975 1976 default: 1977 BFD_FAIL (); 1978 return FALSE; 1979 } 1980 1981 r = cris_final_link_relocate (howto, input_bfd, input_section, 1982 contents, rel, relocation); 1983 1984 if (r != bfd_reloc_ok) 1985 { 1986 const char * msg = (const char *) NULL; 1987 1988 switch (r) 1989 { 1990 case bfd_reloc_overflow: 1991 (*info->callbacks->reloc_overflow) 1992 (info, (h ? &h->root : NULL), symname, howto->name, 1993 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1994 if (additional_relocation_error_msg_count > 0) 1995 { 1996 additional_relocation_error_msg_count--; 1997 switch (r_type) 1998 { 1999 case R_CRIS_16_GOTPLT: 2000 case R_CRIS_16_GOT: 2001 2002 /* Not just TLS is involved here, so we make 2003 generation and message depend on -fPIC/-fpic 2004 only. */ 2005 case R_CRIS_16_GOT_TPREL: 2006 case R_CRIS_16_GOT_GD: 2007 _bfd_error_handler 2008 (_("(too many global variables for -fpic:" 2009 " recompile with -fPIC)")); 2010 break; 2011 2012 case R_CRIS_16_TPREL: 2013 case R_CRIS_16_DTPREL: 2014 _bfd_error_handler 2015 (_("(thread-local data too big for -fpic or" 2016 " -msmall-tls: recompile with -fPIC or" 2017 " -mno-small-tls)")); 2018 break; 2019 2020 /* No known cause for overflow for other relocs. */ 2021 default: 2022 break; 2023 } 2024 } 2025 break; 2026 2027 case bfd_reloc_undefined: 2028 (*info->callbacks->undefined_symbol) 2029 (info, symname, input_bfd, input_section, rel->r_offset, TRUE); 2030 break; 2031 2032 case bfd_reloc_outofrange: 2033 msg = _("internal error: out of range error"); 2034 break; 2035 2036 case bfd_reloc_notsupported: 2037 msg = _("internal error: unsupported relocation error"); 2038 break; 2039 2040 case bfd_reloc_dangerous: 2041 msg = _("internal error: dangerous relocation"); 2042 break; 2043 2044 default: 2045 msg = _("internal error: unknown error"); 2046 break; 2047 } 2048 2049 if (msg) 2050 (*info->callbacks->warning) (info, msg, symname, input_bfd, 2051 input_section, rel->r_offset); 2052 } 2053 } 2054 2055 return TRUE; 2056 } 2057 2058 /* Finish up dynamic symbol handling. We set the contents of various 2059 dynamic sections here. */ 2060 2061 static bfd_boolean 2062 elf_cris_finish_dynamic_symbol (bfd *output_bfd, 2063 struct bfd_link_info *info, 2064 struct elf_link_hash_entry *h, 2065 Elf_Internal_Sym *sym) 2066 { 2067 struct elf_cris_link_hash_table * htab; 2068 2069 /* Where in the plt entry to put values. */ 2070 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16; 2071 2072 /* What offset to add to the distance to the first PLT entry for the 2073 value at plt_off3. */ 2074 int plt_off3_value_bias = 4; 2075 2076 /* Where in the PLT entry the call-dynlink-stub is (happens to be same 2077 for PIC and non-PIC for v32 and pre-v32). */ 2078 int plt_stub_offset = 8; 2079 int plt_entry_size = PLT_ENTRY_SIZE; 2080 const bfd_byte *plt_entry = elf_cris_plt_entry; 2081 const bfd_byte *plt_pic_entry = elf_cris_pic_plt_entry; 2082 2083 htab = elf_cris_hash_table (info); 2084 if (htab == NULL) 2085 return FALSE; 2086 2087 /* Adjust the various PLT entry offsets. */ 2088 if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) 2089 { 2090 plt_off2 = 14; 2091 plt_off3 = 20; 2092 plt_off3_value_bias = -2; 2093 plt_stub_offset = 12; 2094 plt_entry_size = PLT_ENTRY_SIZE_V32; 2095 plt_entry = elf_cris_plt_entry_v32; 2096 plt_pic_entry = elf_cris_pic_plt_entry_v32; 2097 } 2098 2099 if (h->plt.offset != (bfd_vma) -1) 2100 { 2101 asection *splt; 2102 asection *sgotplt; 2103 asection *srela; 2104 bfd_vma got_base; 2105 2106 bfd_vma gotplt_offset 2107 = elf_cris_hash_entry (h)->gotplt_offset; 2108 Elf_Internal_Rela rela; 2109 bfd_byte *loc; 2110 bfd_boolean has_gotplt = gotplt_offset != 0; 2111 2112 /* Get the index in the .rela.plt relocations for the .got.plt 2113 entry that corresponds to this symbol. 2114 We have to count backwards here, and the result is only valid 2115 as an index into .rela.plt. We also have to undo the effect 2116 of the R_CRIS_DTPMOD entry at .got index 3 (offset 12 into 2117 .got.plt) for which gotplt_offset is adjusted, because while 2118 that entry goes into .got.plt, its relocation goes into 2119 .rela.got, not .rela.plt. (It's not PLT-specific; not to be 2120 processed as part of the runtime lazy .rela.plt relocation). 2121 FIXME: There be literal constants here... */ 2122 bfd_vma rela_plt_index 2123 = (htab->dtpmod_refcount != 0 2124 ? gotplt_offset/4 - 2 - 3 : gotplt_offset/4 - 3); 2125 2126 /* Get the offset into the .got table of the entry that corresponds 2127 to this function. Note that we embed knowledge that "incoming" 2128 .got goes after .got.plt in the output without padding (pointer 2129 aligned). However, that knowledge is present in several other 2130 places too. */ 2131 bfd_vma got_offset 2132 = (has_gotplt 2133 ? gotplt_offset 2134 : h->got.offset + htab->next_gotplt_entry); 2135 2136 /* This symbol has an entry in the procedure linkage table. Set it 2137 up. */ 2138 2139 BFD_ASSERT (h->dynindx != -1); 2140 2141 splt = htab->root.splt; 2142 sgotplt = htab->root.sgotplt; 2143 srela = htab->root.srelplt; 2144 BFD_ASSERT (splt != NULL && sgotplt != NULL 2145 && (! has_gotplt || srela != NULL)); 2146 2147 got_base = sgotplt->output_section->vma + sgotplt->output_offset; 2148 2149 /* Fill in the entry in the procedure linkage table. */ 2150 if (! bfd_link_pic (info)) 2151 { 2152 memcpy (splt->contents + h->plt.offset, plt_entry, 2153 plt_entry_size); 2154 2155 /* We need to enter the absolute address of the GOT entry here. */ 2156 bfd_put_32 (output_bfd, got_base + got_offset, 2157 splt->contents + h->plt.offset + plt_off1); 2158 } 2159 else 2160 { 2161 memcpy (splt->contents + h->plt.offset, plt_pic_entry, 2162 plt_entry_size); 2163 bfd_put_32 (output_bfd, got_offset, 2164 splt->contents + h->plt.offset + plt_off1); 2165 } 2166 2167 /* Fill in the plt entry and make a relocation, if this is a "real" 2168 PLT entry. */ 2169 if (has_gotplt) 2170 { 2171 /* Fill in the offset to the reloc table. */ 2172 bfd_put_32 (output_bfd, 2173 rela_plt_index * sizeof (Elf32_External_Rela), 2174 splt->contents + h->plt.offset + plt_off2); 2175 2176 /* Fill in the offset to the first PLT entry, where to "jump". */ 2177 bfd_put_32 (output_bfd, 2178 - (h->plt.offset + plt_off3 + plt_off3_value_bias), 2179 splt->contents + h->plt.offset + plt_off3); 2180 2181 /* Fill in the entry in the global offset table with the address of 2182 the relocating stub. */ 2183 bfd_put_32 (output_bfd, 2184 (splt->output_section->vma 2185 + splt->output_offset 2186 + h->plt.offset 2187 + plt_stub_offset), 2188 sgotplt->contents + got_offset); 2189 2190 /* Fill in the entry in the .rela.plt section. */ 2191 rela.r_offset = (sgotplt->output_section->vma 2192 + sgotplt->output_offset 2193 + got_offset); 2194 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT); 2195 rela.r_addend = 0; 2196 loc = srela->contents + rela_plt_index * sizeof (Elf32_External_Rela); 2197 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 2198 } 2199 2200 if (!h->def_regular) 2201 { 2202 /* Mark the symbol as undefined, rather than as defined in 2203 the .plt section. Leave the value alone. */ 2204 sym->st_shndx = SHN_UNDEF; 2205 2206 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't 2207 know whether resetting the value is significant; if it really 2208 is, rather than a quirk or bug in the sparc port, then I 2209 believe we'd see this elsewhere. */ 2210 /* If the symbol is weak, we do need to clear the value. 2211 Otherwise, the PLT entry would provide a definition for 2212 the symbol even if the symbol wasn't defined anywhere, 2213 and so the symbol would never be NULL. */ 2214 if (!h->ref_regular_nonweak) 2215 sym->st_value = 0; 2216 } 2217 } 2218 2219 /* For an ordinary program, we emit .got relocs only for symbols that 2220 are in the dynamic-symbols table and are either defined by the 2221 program or are undefined weak symbols, or are function symbols 2222 where we do not output a PLT: the PLT reloc was output above and all 2223 references to the function symbol are redirected to the PLT. */ 2224 if (h->got.offset != (bfd_vma) -1 2225 && (elf_cris_hash_entry (h)->reg_got_refcount > 0) 2226 && (bfd_link_pic (info) 2227 || (h->dynindx != -1 2228 && h->plt.offset == (bfd_vma) -1 2229 && !h->def_regular 2230 && h->root.type != bfd_link_hash_undefweak))) 2231 { 2232 asection *sgot; 2233 asection *srela; 2234 Elf_Internal_Rela rela; 2235 bfd_byte *loc; 2236 bfd_byte *where; 2237 2238 /* This symbol has an entry in the global offset table. Set it up. */ 2239 2240 sgot = htab->root.sgot; 2241 srela = htab->root.srelgot; 2242 BFD_ASSERT (sgot != NULL && srela != NULL); 2243 2244 rela.r_offset = (sgot->output_section->vma 2245 + sgot->output_offset 2246 + (h->got.offset &~ (bfd_vma) 1)); 2247 2248 /* If this is a static link, or it is a -Bsymbolic link and the 2249 symbol is defined locally or was forced to be local because 2250 of a version file, we just want to emit a RELATIVE reloc. 2251 The entry in the global offset table will already have been 2252 initialized in the relocate_section function. */ 2253 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1); 2254 if (! elf_hash_table (info)->dynamic_sections_created 2255 || (bfd_link_pic (info) 2256 && (SYMBOLIC_BIND (info, h) || h->dynindx == -1) 2257 && h->def_regular)) 2258 { 2259 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 2260 rela.r_addend = bfd_get_signed_32 (output_bfd, where); 2261 } 2262 else 2263 { 2264 bfd_put_32 (output_bfd, (bfd_vma) 0, where); 2265 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT); 2266 rela.r_addend = 0; 2267 } 2268 2269 loc = srela->contents; 2270 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 2271 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 2272 } 2273 2274 if (h->needs_copy) 2275 { 2276 asection *s; 2277 Elf_Internal_Rela rela; 2278 bfd_byte *loc; 2279 2280 /* This symbol needs a copy reloc. Set it up. */ 2281 2282 BFD_ASSERT (h->dynindx != -1 2283 && (h->root.type == bfd_link_hash_defined 2284 || h->root.type == bfd_link_hash_defweak)); 2285 2286 if (h->root.u.def.section == htab->root.sdynrelro) 2287 s = htab->root.sreldynrelro; 2288 else 2289 s = htab->root.srelbss; 2290 2291 rela.r_offset = (h->root.u.def.value 2292 + h->root.u.def.section->output_section->vma 2293 + h->root.u.def.section->output_offset); 2294 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY); 2295 rela.r_addend = 0; 2296 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 2297 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 2298 } 2299 2300 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 2301 if (h == elf_hash_table (info)->hdynamic 2302 || h == elf_hash_table (info)->hgot) 2303 sym->st_shndx = SHN_ABS; 2304 2305 return TRUE; 2306 } 2307 2308 /* Finish up the dynamic sections. Do *not* emit relocs here, as their 2309 offsets were changed, as part of -z combreloc handling, from those we 2310 computed. */ 2311 2312 static bfd_boolean 2313 elf_cris_finish_dynamic_sections (bfd *output_bfd, 2314 struct bfd_link_info *info) 2315 { 2316 bfd *dynobj; 2317 asection *sgot; 2318 asection *sdyn; 2319 2320 dynobj = elf_hash_table (info)->dynobj; 2321 2322 sgot = elf_hash_table (info)->sgotplt; 2323 BFD_ASSERT (sgot != NULL); 2324 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 2325 2326 if (elf_hash_table (info)->dynamic_sections_created) 2327 { 2328 asection *splt; 2329 Elf32_External_Dyn *dyncon, *dynconend; 2330 2331 splt = elf_hash_table (info)->splt; 2332 BFD_ASSERT (splt != NULL && sdyn != NULL); 2333 2334 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2335 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2336 for (; dyncon < dynconend; dyncon++) 2337 { 2338 Elf_Internal_Dyn dyn; 2339 asection *s; 2340 2341 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2342 2343 switch (dyn.d_tag) 2344 { 2345 default: 2346 break; 2347 2348 case DT_PLTGOT: 2349 dyn.d_un.d_ptr = sgot->output_section->vma + sgot->output_offset; 2350 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2351 break; 2352 2353 case DT_JMPREL: 2354 /* Yes, we *can* have a .plt and no .plt.rela, for instance 2355 if all symbols are found in the .got (not .got.plt). */ 2356 s = elf_hash_table (info)->srelplt; 2357 dyn.d_un.d_ptr = s != NULL ? (s->output_section->vma 2358 + s->output_offset) : 0; 2359 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2360 break; 2361 2362 case DT_PLTRELSZ: 2363 s = elf_hash_table (info)->srelplt; 2364 if (s == NULL) 2365 dyn.d_un.d_val = 0; 2366 else 2367 dyn.d_un.d_val = s->size; 2368 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2369 break; 2370 } 2371 } 2372 2373 /* Fill in the first entry in the procedure linkage table. */ 2374 if (splt->size > 0) 2375 { 2376 if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) 2377 { 2378 if (bfd_link_pic (info)) 2379 memcpy (splt->contents, elf_cris_pic_plt0_entry_v32, 2380 PLT_ENTRY_SIZE_V32); 2381 else 2382 { 2383 memcpy (splt->contents, elf_cris_plt0_entry_v32, 2384 PLT_ENTRY_SIZE_V32); 2385 bfd_put_32 (output_bfd, 2386 sgot->output_section->vma 2387 + sgot->output_offset + 4, 2388 splt->contents + 4); 2389 2390 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2391 = PLT_ENTRY_SIZE_V32; 2392 } 2393 } 2394 else 2395 { 2396 if (bfd_link_pic (info)) 2397 memcpy (splt->contents, elf_cris_pic_plt0_entry, 2398 PLT_ENTRY_SIZE); 2399 else 2400 { 2401 memcpy (splt->contents, elf_cris_plt0_entry, 2402 PLT_ENTRY_SIZE); 2403 bfd_put_32 (output_bfd, 2404 sgot->output_section->vma 2405 + sgot->output_offset + 4, 2406 splt->contents + 6); 2407 bfd_put_32 (output_bfd, 2408 sgot->output_section->vma 2409 + sgot->output_offset + 8, 2410 splt->contents + 14); 2411 2412 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2413 = PLT_ENTRY_SIZE; 2414 } 2415 } 2416 } 2417 } 2418 2419 /* Fill in the first three entries in the global offset table. */ 2420 if (sgot->size > 0) 2421 { 2422 if (sdyn == NULL) 2423 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2424 else 2425 bfd_put_32 (output_bfd, 2426 sdyn->output_section->vma + sdyn->output_offset, 2427 sgot->contents); 2428 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 2429 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 2430 } 2431 2432 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2433 2434 return TRUE; 2435 } 2436 2437 /* Return the section that should be marked against GC for a given 2438 relocation. */ 2439 2440 static asection * 2441 cris_elf_gc_mark_hook (asection *sec, 2442 struct bfd_link_info *info, 2443 Elf_Internal_Rela *rel, 2444 struct elf_link_hash_entry *h, 2445 Elf_Internal_Sym *sym) 2446 { 2447 enum elf_cris_reloc_type r_type = ELF32_R_TYPE (rel->r_info); 2448 if (h != NULL) 2449 switch (r_type) 2450 { 2451 case R_CRIS_GNU_VTINHERIT: 2452 case R_CRIS_GNU_VTENTRY: 2453 return NULL; 2454 2455 default: 2456 break; 2457 } 2458 2459 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2460 } 2461 2462 /* The elf_backend_plt_sym_val hook function. */ 2463 2464 static bfd_vma 2465 cris_elf_plt_sym_val (bfd_vma i ATTRIBUTE_UNUSED, const asection *plt, 2466 const arelent *rel) 2467 { 2468 bfd_size_type plt_entry_size; 2469 bfd_size_type pltoffs; 2470 bfd *abfd = plt->owner; 2471 2472 /* Same for CRIS and CRIS v32; see elf_cris_(|pic_)plt_entry(|_v32)[]. */ 2473 bfd_size_type plt_entry_got_offset = 2; 2474 bfd_size_type plt_sec_size; 2475 bfd_size_type got_vma_for_dyn; 2476 asection *got; 2477 2478 /* FIXME: the .got section should be readily available also when 2479 we're not linking. */ 2480 if ((got = bfd_get_section_by_name (abfd, ".got")) == NULL) 2481 return (bfd_vma) -1; 2482 2483 plt_sec_size = bfd_section_size (plt->owner, plt); 2484 plt_entry_size 2485 = (bfd_get_mach (abfd) == bfd_mach_cris_v32 2486 ? PLT_ENTRY_SIZE_V32 : PLT_ENTRY_SIZE); 2487 2488 /* Data in PLT is GOT-relative for DYN, but absolute for EXE. */ 2489 got_vma_for_dyn = (abfd->flags & EXEC_P) ? 0 : got->vma; 2490 2491 /* Because we can have merged GOT entries; a single .got entry for 2492 both GOT and the PLT part of the GOT (.got.plt), the index of the 2493 reloc in .rela.plt is not the same as the index in the PLT. 2494 Instead, we have to hunt down the GOT offset in the PLT that 2495 corresponds to that of this reloc. Unfortunately, we will only 2496 be called for the .rela.plt relocs, so we'll miss synthetic 2497 symbols for .plt entries with merged GOT entries. (FIXME: 2498 fixable by providing our own bfd_elf32_get_synthetic_symtab. 2499 Doesn't seem worthwile at time of this writing.) FIXME: we've 2500 gone from O(1) to O(N) (N number of PLT entries) for finding each 2501 PLT address. Shouldn't matter in practice though. */ 2502 2503 for (pltoffs = plt_entry_size; 2504 pltoffs < plt_sec_size; 2505 pltoffs += plt_entry_size) 2506 { 2507 bfd_size_type got_offset; 2508 bfd_byte gotoffs_raw[4]; 2509 2510 if (!bfd_get_section_contents (abfd, (asection *) plt, gotoffs_raw, 2511 pltoffs + plt_entry_got_offset, 2512 sizeof (gotoffs_raw))) 2513 return (bfd_vma) -1; 2514 2515 got_offset = bfd_get_32 (abfd, gotoffs_raw); 2516 if (got_offset + got_vma_for_dyn == rel->address) 2517 return plt->vma + pltoffs; 2518 } 2519 2520 /* While it's tempting to BFD_ASSERT that we shouldn't get here, 2521 that'd not be graceful behavior for invalid input. */ 2522 return (bfd_vma) -1; 2523 } 2524 2525 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 2526 entry but we found we will not create any. Called when we find we will 2527 not have any PLT for this symbol, by for example 2528 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link, 2529 or elf_cris_size_dynamic_sections if no dynamic sections will be 2530 created (we're only linking static objects). */ 2531 2532 static bfd_boolean 2533 elf_cris_adjust_gotplt_to_got (struct elf_cris_link_hash_entry *h, void * p) 2534 { 2535 struct bfd_link_info *info = (struct bfd_link_info *) p; 2536 2537 /* A GOTPLT reloc, when activated, is supposed to be included into 2538 the PLT refcount, when the symbol isn't set-or-forced local. */ 2539 BFD_ASSERT (h->gotplt_refcount == 0 2540 || h->root.plt.refcount == -1 2541 || h->gotplt_refcount <= h->root.plt.refcount); 2542 2543 /* If nobody wanted a GOTPLT with this symbol, we're done. */ 2544 if (h->gotplt_refcount <= 0) 2545 return TRUE; 2546 2547 if (h->reg_got_refcount > 0) 2548 { 2549 /* There's a GOT entry for this symbol. Just adjust the refcounts. 2550 Probably not necessary at this stage, but keeping them accurate 2551 helps avoiding surprises later. */ 2552 h->root.got.refcount += h->gotplt_refcount; 2553 h->reg_got_refcount += h->gotplt_refcount; 2554 h->gotplt_refcount = 0; 2555 } 2556 else 2557 { 2558 /* No GOT entry for this symbol. We need to create one. */ 2559 asection *sgot; 2560 asection *srelgot; 2561 2562 sgot = elf_hash_table (info)->sgot; 2563 srelgot = elf_hash_table (info)->srelgot; 2564 2565 /* Put accurate refcounts there. */ 2566 BFD_ASSERT (h->root.got.refcount >= 0); 2567 h->root.got.refcount += h->gotplt_refcount; 2568 h->reg_got_refcount = h->gotplt_refcount; 2569 2570 h->gotplt_refcount = 0; 2571 2572 /* We always have a .got and a .rela.got section if there were 2573 GOTPLT relocs in input. */ 2574 BFD_ASSERT (sgot != NULL && srelgot != NULL); 2575 2576 /* Allocate space in the .got section. */ 2577 sgot->size += 4; 2578 2579 /* Allocate relocation space. */ 2580 srelgot->size += sizeof (Elf32_External_Rela); 2581 } 2582 2583 return TRUE; 2584 } 2585 2586 /* Try to fold PLT entries with GOT entries. There are two cases when we 2587 want to do this: 2588 2589 - When all PLT references are GOTPLT references, and there are GOT 2590 references, and this is not the executable. We don't have to 2591 generate a PLT at all. 2592 2593 - When there are both (ordinary) PLT references and GOT references, 2594 and this isn't the executable. 2595 We want to make the PLT reference use the ordinary GOT entry rather 2596 than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry, 2597 since the GOT entry will have to be resolved at startup anyway. 2598 2599 Though the latter case is handled when room for the PLT is allocated, 2600 not here. 2601 2602 By folding into the GOT, we may need a round-trip to a PLT in the 2603 executable for calls, a loss in performance. Still, losing a 2604 reloc is a win in size and at least in start-up time. 2605 2606 Note that this function is called before symbols are forced local by 2607 version scripts. The differing cases are handled by 2608 elf_cris_hide_symbol. */ 2609 2610 static bfd_boolean 2611 elf_cris_try_fold_plt_to_got (struct elf_cris_link_hash_entry *h, void * p) 2612 { 2613 struct bfd_link_info *info = (struct bfd_link_info *) p; 2614 2615 /* If there are no GOT references for this symbol, we can't fold any 2616 other reference so there's nothing to do. Likewise if there are no 2617 PLT references; GOTPLT references included. */ 2618 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0) 2619 return TRUE; 2620 2621 /* GOTPLT relocs are supposed to be included into the PLT refcount. */ 2622 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount); 2623 2624 if (h->gotplt_refcount == h->root.plt.refcount) 2625 { 2626 /* The only PLT references are GOTPLT references, and there are GOT 2627 references. Convert PLT to GOT references. */ 2628 if (! elf_cris_adjust_gotplt_to_got (h, info)) 2629 return FALSE; 2630 2631 /* Clear the PLT references, so no PLT will be created. */ 2632 h->root.plt.offset = (bfd_vma) -1; 2633 } 2634 2635 return TRUE; 2636 } 2637 2638 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc 2639 to use a GOT entry (and create one) rather than requiring a GOTPLT 2640 entry. */ 2641 2642 static void 2643 elf_cris_hide_symbol (struct bfd_link_info *info, 2644 struct elf_link_hash_entry *h, 2645 bfd_boolean force_local) 2646 { 2647 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info); 2648 2649 _bfd_elf_link_hash_hide_symbol (info, h, force_local); 2650 } 2651 2652 /* Adjust a symbol defined by a dynamic object and referenced by a 2653 regular object. The current definition is in some section of the 2654 dynamic object, but we're not including those sections. We have to 2655 change the definition to something the rest of the link can 2656 understand. */ 2657 2658 static bfd_boolean 2659 elf_cris_adjust_dynamic_symbol (struct bfd_link_info *info, 2660 struct elf_link_hash_entry *h) 2661 { 2662 struct elf_cris_link_hash_table * htab; 2663 bfd *dynobj; 2664 asection *s; 2665 asection *srel; 2666 bfd_size_type plt_entry_size; 2667 2668 htab = elf_cris_hash_table (info); 2669 if (htab == NULL) 2670 return FALSE; 2671 2672 dynobj = htab->root.dynobj; 2673 2674 /* Make sure we know what is going on here. */ 2675 BFD_ASSERT (dynobj != NULL 2676 && (h->needs_plt 2677 || h->is_weakalias 2678 || (h->def_dynamic 2679 && h->ref_regular 2680 && !h->def_regular))); 2681 2682 plt_entry_size 2683 = (bfd_get_mach (dynobj) == bfd_mach_cris_v32 2684 ? PLT_ENTRY_SIZE_V32 : PLT_ENTRY_SIZE); 2685 2686 /* If this is a function, put it in the procedure linkage table. We 2687 will fill in the contents of the procedure linkage table later, 2688 when we know the address of the .got section. */ 2689 if (h->type == STT_FUNC 2690 || h->needs_plt) 2691 { 2692 /* If we link a program (not a DSO), we'll get rid of unnecessary 2693 PLT entries; we point to the actual symbols -- even for pic 2694 relocs, because a program built with -fpic should have the same 2695 result as one built without -fpic, specifically considering weak 2696 symbols. 2697 FIXME: m68k and i386 differ here, for unclear reasons. */ 2698 if (! bfd_link_pic (info) 2699 && !h->def_dynamic) 2700 { 2701 /* This case can occur if we saw a PLT reloc in an input file, 2702 but the symbol was not defined by a dynamic object. In such 2703 a case, we don't actually need to build a procedure linkage 2704 table, and we can just do an absolute or PC reloc instead, or 2705 change a .got.plt index to a .got index for GOTPLT relocs. */ 2706 BFD_ASSERT (h->needs_plt); 2707 h->needs_plt = 0; 2708 h->plt.offset = (bfd_vma) -1; 2709 return 2710 elf_cris_adjust_gotplt_to_got ((struct 2711 elf_cris_link_hash_entry *) h, 2712 info); 2713 } 2714 2715 /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT; 2716 where a pointer-equivalent symbol was unimportant (i.e. more 2717 like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid 2718 of the PLT. We can't for the executable, because the GOT 2719 entries will point to the PLT there (and be constant). */ 2720 if (bfd_link_pic (info) 2721 && !elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry*) 2722 h, info)) 2723 return FALSE; 2724 2725 /* GC or folding may have rendered this entry unused. */ 2726 if (h->plt.refcount <= 0) 2727 { 2728 h->needs_plt = 0; 2729 h->plt.offset = (bfd_vma) -1; 2730 return TRUE; 2731 } 2732 2733 /* Make sure this symbol is output as a dynamic symbol. */ 2734 if (h->dynindx == -1) 2735 { 2736 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2737 return FALSE; 2738 } 2739 2740 s = htab->root.splt; 2741 BFD_ASSERT (s != NULL); 2742 2743 /* If this is the first .plt entry, make room for the special 2744 first entry. */ 2745 if (s->size == 0) 2746 s->size += plt_entry_size; 2747 2748 /* If this symbol is not defined in a regular file, and we are 2749 not generating a shared library, then set the symbol to this 2750 location in the .plt. */ 2751 if (!bfd_link_pic (info) 2752 && !h->def_regular) 2753 { 2754 h->root.u.def.section = s; 2755 h->root.u.def.value = s->size; 2756 } 2757 2758 /* If there's already a GOT entry, use that, not a .got.plt. A 2759 GOT field still has a reference count when we get here; it's 2760 not yet changed to an offset. We can't do this for an 2761 executable, because then the reloc associated with the PLT 2762 would get a non-PLT reloc pointing to the PLT. FIXME: Move 2763 this to elf_cris_try_fold_plt_to_got. */ 2764 if (bfd_link_pic (info) && h->got.refcount > 0) 2765 { 2766 h->got.refcount += h->plt.refcount; 2767 2768 /* Mark the PLT offset to use the GOT entry by setting the low 2769 bit in the plt offset; it is always a multiple of 2770 plt_entry_size (which is at least a multiple of 2). */ 2771 BFD_ASSERT ((s->size % plt_entry_size) == 0); 2772 2773 /* Change the PLT refcount to an offset. */ 2774 h->plt.offset = s->size; 2775 2776 /* By not setting gotplt_offset (i.e. it remains at 0), we signal 2777 that the got entry should be used instead. */ 2778 BFD_ASSERT (((struct elf_cris_link_hash_entry *) 2779 h)->gotplt_offset == 0); 2780 2781 /* Make room for this entry. */ 2782 s->size += plt_entry_size; 2783 2784 return TRUE; 2785 } 2786 2787 /* No GOT reference for this symbol; prepare for an ordinary PLT. */ 2788 h->plt.offset = s->size; 2789 2790 /* Make room for this entry. */ 2791 s->size += plt_entry_size; 2792 2793 /* We also need to make an entry in the .got.plt section, which 2794 will be placed in the .got section by the linker script. */ 2795 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset 2796 = htab->next_gotplt_entry; 2797 htab->next_gotplt_entry += 4; 2798 2799 s = htab->root.sgotplt; 2800 BFD_ASSERT (s != NULL); 2801 s->size += 4; 2802 2803 /* We also need to make an entry in the .rela.plt section. */ 2804 2805 s = htab->root.srelplt; 2806 BFD_ASSERT (s != NULL); 2807 s->size += sizeof (Elf32_External_Rela); 2808 2809 return TRUE; 2810 } 2811 2812 /* Reinitialize the plt offset now that it is not used as a reference 2813 count any more. */ 2814 h->plt.offset = (bfd_vma) -1; 2815 2816 /* If this is a weak symbol, and there is a real definition, the 2817 processor independent code will have arranged for us to see the 2818 real definition first, and we can just use the same value. */ 2819 if (h->is_weakalias) 2820 { 2821 struct elf_link_hash_entry *def = weakdef (h); 2822 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 2823 h->root.u.def.section = def->root.u.def.section; 2824 h->root.u.def.value = def->root.u.def.value; 2825 return TRUE; 2826 } 2827 2828 /* This is a reference to a symbol defined by a dynamic object which 2829 is not a function. */ 2830 2831 /* If we are creating a shared library, we must presume that the 2832 only references to the symbol are via the global offset table. 2833 For such cases we need not do anything here; the relocations will 2834 be handled correctly by relocate_section. */ 2835 if (bfd_link_pic (info)) 2836 return TRUE; 2837 2838 /* If there are no references to this symbol that do not use the 2839 GOT, we don't need to generate a copy reloc. */ 2840 if (!h->non_got_ref) 2841 return TRUE; 2842 2843 /* We must allocate the symbol in our .dynbss section, which will 2844 become part of the .bss section of the executable. There will be 2845 an entry for this symbol in the .dynsym section. The dynamic 2846 object will contain position independent code, so all references 2847 from the dynamic object to this symbol will go through the global 2848 offset table. The dynamic linker will use the .dynsym entry to 2849 determine the address it must put in the global offset table, so 2850 both the dynamic object and the regular object will refer to the 2851 same memory location for the variable. */ 2852 2853 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to 2854 copy the initial value out of the dynamic object and into the 2855 runtime process image. We need to remember the offset into the 2856 .rela.bss section we are going to use. */ 2857 2858 if ((h->root.u.def.section->flags & SEC_READONLY) != 0) 2859 { 2860 s = htab->root.sdynrelro; 2861 srel = htab->root.sreldynrelro; 2862 } 2863 else 2864 { 2865 s = htab->root.sdynbss; 2866 srel = htab->root.srelbss; 2867 } 2868 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 2869 { 2870 BFD_ASSERT (srel != NULL); 2871 srel->size += sizeof (Elf32_External_Rela); 2872 h->needs_copy = 1; 2873 } 2874 2875 BFD_ASSERT (s != NULL); 2876 2877 return _bfd_elf_adjust_dynamic_copy (info, h, s); 2878 } 2879 2880 /* Adjust our "subclass" elements for an indirect symbol. */ 2881 2882 static void 2883 elf_cris_copy_indirect_symbol (struct bfd_link_info *info, 2884 struct elf_link_hash_entry *dir, 2885 struct elf_link_hash_entry *ind) 2886 { 2887 struct elf_cris_link_hash_entry *edir, *eind; 2888 2889 edir = (struct elf_cris_link_hash_entry *) dir; 2890 eind = (struct elf_cris_link_hash_entry *) ind; 2891 2892 /* Only indirect symbols are replaced; we're not interested in 2893 updating any of EIND's fields for other symbols. */ 2894 if (eind->root.root.type != bfd_link_hash_indirect) 2895 { 2896 /* Still, we need to copy flags for e.g. weak definitions. */ 2897 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 2898 return; 2899 } 2900 2901 BFD_ASSERT (edir->gotplt_offset == 0 || eind->gotplt_offset == 0); 2902 2903 #define XMOVOPZ(F, OP, Z) edir->F OP eind->F; eind->F = Z 2904 #define XMOVE(F) XMOVOPZ (F, +=, 0) 2905 if (eind->pcrel_relocs_copied != NULL) 2906 { 2907 if (edir->pcrel_relocs_copied != NULL) 2908 { 2909 struct elf_cris_pcrel_relocs_copied **pp; 2910 struct elf_cris_pcrel_relocs_copied *p; 2911 2912 /* Add reloc counts against the indirect sym to the direct sym 2913 list. Merge any entries against the same section. */ 2914 for (pp = &eind->pcrel_relocs_copied; *pp != NULL;) 2915 { 2916 struct elf_cris_pcrel_relocs_copied *q; 2917 p = *pp; 2918 for (q = edir->pcrel_relocs_copied; q != NULL; q = q->next) 2919 if (q->section == p->section) 2920 { 2921 q->count += p->count; 2922 *pp = p->next; 2923 break; 2924 } 2925 if (q == NULL) 2926 pp = &p->next; 2927 } 2928 *pp = edir->pcrel_relocs_copied; 2929 } 2930 XMOVOPZ (pcrel_relocs_copied, =, NULL); 2931 } 2932 XMOVE (gotplt_refcount); 2933 XMOVE (gotplt_offset); 2934 XMOVE (reg_got_refcount); 2935 XMOVE (tprel_refcount); 2936 XMOVE (dtp_refcount); 2937 #undef XMOVE 2938 #undef XMOVOPZ 2939 2940 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 2941 } 2942 2943 /* Look through the relocs for a section during the first phase. */ 2944 2945 static bfd_boolean 2946 cris_elf_check_relocs (bfd *abfd, 2947 struct bfd_link_info *info, 2948 asection *sec, 2949 const Elf_Internal_Rela *relocs) 2950 { 2951 struct elf_cris_link_hash_table * htab; 2952 bfd *dynobj; 2953 Elf_Internal_Shdr *symtab_hdr; 2954 struct elf_link_hash_entry **sym_hashes; 2955 bfd_signed_vma *local_got_refcounts; 2956 const Elf_Internal_Rela *rel; 2957 const Elf_Internal_Rela *rel_end; 2958 asection *sgot; 2959 asection *srelgot; 2960 asection *sreloc; 2961 2962 if (bfd_link_relocatable (info)) 2963 return TRUE; 2964 2965 htab = elf_cris_hash_table (info); 2966 if (htab == NULL) 2967 return FALSE; 2968 2969 dynobj = elf_hash_table (info)->dynobj; 2970 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2971 sym_hashes = elf_sym_hashes (abfd); 2972 local_got_refcounts = elf_local_got_refcounts (abfd); 2973 2974 sgot = NULL; 2975 srelgot = NULL; 2976 sreloc = NULL; 2977 2978 rel_end = relocs + sec->reloc_count; 2979 for (rel = relocs; rel < rel_end; rel++) 2980 { 2981 struct elf_link_hash_entry *h; 2982 unsigned long r_symndx; 2983 enum elf_cris_reloc_type r_type; 2984 bfd_signed_vma got_element_size = 4; 2985 unsigned long r_symndx_lgot = INT_MAX; 2986 2987 r_symndx = ELF32_R_SYM (rel->r_info); 2988 if (r_symndx < symtab_hdr->sh_info) 2989 { 2990 h = NULL; 2991 r_symndx_lgot = LGOT_REG_NDX (r_symndx); 2992 } 2993 else 2994 { 2995 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2996 while (h->root.type == bfd_link_hash_indirect 2997 || h->root.type == bfd_link_hash_warning) 2998 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2999 } 3000 3001 r_type = ELF32_R_TYPE (rel->r_info); 3002 3003 /* Some relocs require linker-created sections; we need to hang them 3004 on the first input bfd we found that contained dynamic relocs. */ 3005 switch (r_type) 3006 { 3007 case R_CRIS_32_DTPREL: 3008 if ((sec->flags & SEC_ALLOC) == 0) 3009 /* This'd be a .dtpreld entry in e.g. debug info. We have 3010 several different switch statements below, but none of 3011 that is needed; we need no preparations for resolving 3012 R_CRIS_32_DTPREL into a non-allocated section (debug 3013 info), so let's just move on to the next 3014 relocation. */ 3015 continue; 3016 /* Fall through. */ 3017 case R_CRIS_16_DTPREL: 3018 /* The first .got.plt entry is right after the R_CRIS_DTPMOD 3019 entry at index 3. */ 3020 if (htab->dtpmod_refcount == 0) 3021 htab->next_gotplt_entry += 8; 3022 3023 htab->dtpmod_refcount++; 3024 /* Fall through. */ 3025 3026 case R_CRIS_32_IE: 3027 case R_CRIS_32_GD: 3028 case R_CRIS_16_GOT_GD: 3029 case R_CRIS_32_GOT_GD: 3030 case R_CRIS_32_GOT_TPREL: 3031 case R_CRIS_16_GOT_TPREL: 3032 case R_CRIS_16_GOT: 3033 case R_CRIS_32_GOT: 3034 case R_CRIS_32_GOTREL: 3035 case R_CRIS_32_PLT_GOTREL: 3036 case R_CRIS_32_PLT_PCREL: 3037 case R_CRIS_16_GOTPLT: 3038 case R_CRIS_32_GOTPLT: 3039 if (dynobj == NULL) 3040 { 3041 elf_hash_table (info)->dynobj = dynobj = abfd; 3042 3043 /* We could handle this if we can get a handle on the 3044 output bfd in elf_cris_adjust_dynamic_symbol. Failing 3045 that, we must insist on dynobj being a specific mach. */ 3046 if (bfd_get_mach (dynobj) == bfd_mach_cris_v10_v32) 3047 { 3048 _bfd_error_handler 3049 /* xgettext:c-format */ 3050 (_("%pB, section %pA: v10/v32 compatible object" 3051 " must not contain a PIC relocation"), 3052 abfd, sec); 3053 return FALSE; 3054 } 3055 } 3056 3057 if (sgot == NULL) 3058 { 3059 /* We may have a dynobj but no .got section, if machine- 3060 independent parts of the linker found a reason to create 3061 a dynobj. We want to create the .got section now, so we 3062 can assume it's always present whenever there's a dynobj. 3063 It's ok to call this function more than once. */ 3064 if (!_bfd_elf_create_got_section (dynobj, info)) 3065 return FALSE; 3066 3067 sgot = elf_hash_table (info)->sgot; 3068 srelgot = elf_hash_table (info)->srelgot; 3069 } 3070 3071 if (local_got_refcounts == NULL) 3072 { 3073 bfd_size_type amt; 3074 3075 /* We use index local_got_refcounts[-1] to count all 3076 GOT-relative relocations that do not have explicit 3077 GOT entries. */ 3078 amt = LGOT_ALLOC_NELTS_FOR (symtab_hdr->sh_info) + 1; 3079 amt *= sizeof (bfd_signed_vma); 3080 local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt)); 3081 if (local_got_refcounts == NULL) 3082 return FALSE; 3083 3084 local_got_refcounts++; 3085 elf_local_got_refcounts (abfd) = local_got_refcounts; 3086 } 3087 break; 3088 3089 default: 3090 break; 3091 } 3092 3093 /* Warn and error for invalid input. */ 3094 switch (r_type) 3095 { 3096 case R_CRIS_32_IE: 3097 case R_CRIS_32_TPREL: 3098 case R_CRIS_16_TPREL: 3099 case R_CRIS_32_GD: 3100 if (bfd_link_pic (info)) 3101 { 3102 _bfd_error_handler 3103 /* xgettext:c-format */ 3104 (_("%pB, section %pA:\n relocation %s not valid" 3105 " in a shared object;" 3106 " typically an option mixup, recompile with -fPIC"), 3107 abfd, 3108 sec, 3109 cris_elf_howto_table[r_type].name); 3110 /* Don't return FALSE here; we want messages for all of 3111 these and the error behavior is ungraceful 3112 anyway. */ 3113 } 3114 default: 3115 break; 3116 } 3117 3118 switch (r_type) 3119 { 3120 case R_CRIS_32_GD: 3121 case R_CRIS_16_GOT_GD: 3122 case R_CRIS_32_GOT_GD: 3123 /* These are requests for tls_index entries, run-time R_CRIS_DTP. */ 3124 got_element_size = 8; 3125 r_symndx_lgot = LGOT_DTP_NDX (r_symndx); 3126 break; 3127 3128 case R_CRIS_16_DTPREL: 3129 case R_CRIS_32_DTPREL: 3130 /* These two just request for the constant-index 3131 module-local tls_index-sized GOT entry, which we add 3132 elsewhere. */ 3133 break; 3134 3135 case R_CRIS_32_IE: 3136 case R_CRIS_32_GOT_TPREL: 3137 case R_CRIS_16_GOT_TPREL: 3138 r_symndx_lgot = LGOT_TPREL_NDX (r_symndx); 3139 3140 /* Those relocs also require that a DSO is of type 3141 Initial Exec. Like other targets, we don't reset this 3142 flag even if the relocs are GC:ed away. */ 3143 if (bfd_link_pic (info)) 3144 info->flags |= DF_STATIC_TLS; 3145 break; 3146 3147 /* Let's list the other assembler-generated TLS-relocs too, 3148 just to show that they're not forgotten. */ 3149 case R_CRIS_16_TPREL: 3150 case R_CRIS_32_TPREL: 3151 default: 3152 break; 3153 } 3154 3155 switch (r_type) 3156 { 3157 case R_CRIS_16_GOTPLT: 3158 case R_CRIS_32_GOTPLT: 3159 /* Mark that we need a GOT entry if the PLT entry (and its GOT 3160 entry) is eliminated. We can only do this for a non-local 3161 symbol. */ 3162 if (h != NULL) 3163 { 3164 elf_cris_hash_entry (h)->gotplt_refcount++; 3165 goto handle_gotplt_reloc; 3166 } 3167 /* If h is NULL then this is a local symbol, and we must make a 3168 GOT entry for it, so handle it like a GOT reloc. */ 3169 /* Fall through. */ 3170 3171 case R_CRIS_32_IE: 3172 case R_CRIS_32_GD: 3173 case R_CRIS_16_GOT_GD: 3174 case R_CRIS_32_GOT_GD: 3175 case R_CRIS_32_GOT_TPREL: 3176 case R_CRIS_16_GOT_TPREL: 3177 case R_CRIS_16_GOT: 3178 case R_CRIS_32_GOT: 3179 /* This symbol requires a global offset table entry. */ 3180 if (h != NULL) 3181 { 3182 if (h->got.refcount == 0) 3183 { 3184 /* Make sure this symbol is output as a dynamic symbol. */ 3185 if (h->dynindx == -1) 3186 { 3187 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 3188 return FALSE; 3189 } 3190 } 3191 3192 /* Update the sum of reloc counts for this symbol. */ 3193 h->got.refcount++; 3194 3195 switch (r_type) 3196 { 3197 case R_CRIS_16_GOT: 3198 case R_CRIS_32_GOT: 3199 if (elf_cris_hash_entry (h)->reg_got_refcount == 0) 3200 { 3201 /* Allocate space in the .got section. */ 3202 sgot->size += got_element_size; 3203 /* Allocate relocation space. */ 3204 srelgot->size += sizeof (Elf32_External_Rela); 3205 } 3206 elf_cris_hash_entry (h)->reg_got_refcount++; 3207 break; 3208 3209 case R_CRIS_32_GD: 3210 case R_CRIS_16_GOT_GD: 3211 case R_CRIS_32_GOT_GD: 3212 if (elf_cris_hash_entry (h)->dtp_refcount == 0) 3213 { 3214 /* Allocate space in the .got section. */ 3215 sgot->size += got_element_size; 3216 /* Allocate relocation space. */ 3217 srelgot->size += sizeof (Elf32_External_Rela); 3218 } 3219 elf_cris_hash_entry (h)->dtp_refcount++; 3220 break; 3221 3222 case R_CRIS_32_IE: 3223 case R_CRIS_32_GOT_TPREL: 3224 case R_CRIS_16_GOT_TPREL: 3225 if (elf_cris_hash_entry (h)->tprel_refcount == 0) 3226 { 3227 /* Allocate space in the .got section. */ 3228 sgot->size += got_element_size; 3229 /* Allocate relocation space. */ 3230 srelgot->size += sizeof (Elf32_External_Rela); 3231 } 3232 elf_cris_hash_entry (h)->tprel_refcount++; 3233 break; 3234 3235 default: 3236 BFD_FAIL (); 3237 break; 3238 } 3239 } 3240 else 3241 { 3242 /* This is a global offset table entry for a local symbol. */ 3243 if (local_got_refcounts[r_symndx_lgot] == 0) 3244 { 3245 sgot->size += got_element_size; 3246 if (bfd_link_pic (info)) 3247 { 3248 /* If we are generating a shared object, we need 3249 to output a R_CRIS_RELATIVE reloc so that the 3250 dynamic linker can adjust this GOT entry. 3251 Similarly for non-regular got entries. */ 3252 srelgot->size += sizeof (Elf32_External_Rela); 3253 } 3254 } 3255 /* Update the reloc-specific count. */ 3256 local_got_refcounts[r_symndx_lgot]++; 3257 3258 /* This one is the sum of all the others. */ 3259 local_got_refcounts[r_symndx]++; 3260 } 3261 break; 3262 3263 case R_CRIS_16_DTPREL: 3264 case R_CRIS_32_DTPREL: 3265 case R_CRIS_32_GOTREL: 3266 /* This reference requires a global offset table. 3267 FIXME: The actual refcount isn't used currently; the .got 3268 section can't be removed if there were any references in the 3269 input. */ 3270 local_got_refcounts[-1]++; 3271 break; 3272 3273 handle_gotplt_reloc: 3274 3275 case R_CRIS_32_PLT_GOTREL: 3276 /* This reference requires a global offset table. */ 3277 local_got_refcounts[-1]++; 3278 /* Fall through. */ 3279 3280 case R_CRIS_32_PLT_PCREL: 3281 /* This symbol requires a procedure linkage table entry. We 3282 actually build the entry in adjust_dynamic_symbol, 3283 because this might be a case of linking PIC code which is 3284 never referenced by a dynamic object, in which case we 3285 don't need to generate a procedure linkage table entry 3286 after all. */ 3287 3288 /* Beware: if we'd check for visibility of the symbol here 3289 (and not marking the need for a PLT when non-visible), we'd 3290 get into trouble with keeping handling consistent with 3291 regards to relocs found before definition and GOTPLT 3292 handling. Eliminable PLT entries will be dealt with later 3293 anyway. */ 3294 if (h == NULL) 3295 continue; 3296 3297 h->needs_plt = 1; 3298 3299 /* If the symbol is forced local, the refcount is unavailable. */ 3300 if (h->plt.refcount != -1) 3301 h->plt.refcount++; 3302 break; 3303 3304 case R_CRIS_8: 3305 case R_CRIS_16: 3306 case R_CRIS_32: 3307 /* Let's help debug shared library creation. Any of these 3308 relocs *can* be used in shared libs, but pages containing 3309 them cannot be shared, so they're not appropriate for 3310 common use. Don't warn for sections we don't care about, 3311 such as debug sections or non-constant sections. We 3312 can't help tables of (global) function pointers, for 3313 example, though they must be emitted in a (writable) data 3314 section to avoid having impure text sections. */ 3315 if (bfd_link_pic (info) 3316 && (sec->flags & SEC_ALLOC) != 0 3317 && (sec->flags & SEC_READONLY) != 0) 3318 { 3319 /* FIXME: How do we make this optionally a warning only? */ 3320 _bfd_error_handler 3321 /* xgettext:c-format */ 3322 (_("%pB, section %pA: relocation %s should not" 3323 " be used in a shared object; recompile with -fPIC"), 3324 abfd, 3325 sec, 3326 cris_elf_howto_table[r_type].name); 3327 } 3328 3329 /* We don't need to handle relocs into sections not going into 3330 the "real" output. */ 3331 if ((sec->flags & SEC_ALLOC) == 0) 3332 break; 3333 3334 if (h != NULL) 3335 { 3336 h->non_got_ref = 1; 3337 3338 /* Make sure a plt entry is created for this symbol if it 3339 turns out to be a function defined by a dynamic object. */ 3340 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 3341 h->plt.refcount++; 3342 } 3343 3344 /* If we are creating a shared library and this is not a local 3345 symbol, we need to copy the reloc into the shared library. 3346 However when linking with -Bsymbolic and this is a global 3347 symbol which is defined in an object we are including in the 3348 link (i.e., DEF_REGULAR is set), then we can resolve the 3349 reloc directly. At this point we have not seen all the input 3350 files, so it is possible that DEF_REGULAR is not set now but 3351 will be set later (it is never cleared). In case of a weak 3352 definition, DEF_REGULAR may be cleared later by a strong 3353 definition in a shared library. We account for that 3354 possibility below by storing information in the relocs_copied 3355 field of the hash table entry. A similar situation occurs 3356 when creating shared libraries and symbol visibility changes 3357 render the symbol local. */ 3358 3359 /* No need to do anything if we're not creating a shared object. */ 3360 if (! bfd_link_pic (info) 3361 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 3362 break; 3363 3364 /* We may need to create a reloc section in the dynobj and made room 3365 for this reloc. */ 3366 if (sreloc == NULL) 3367 { 3368 sreloc = _bfd_elf_make_dynamic_reloc_section 3369 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 3370 3371 if (sreloc == NULL) 3372 return FALSE; 3373 } 3374 3375 if (sec->flags & SEC_READONLY) 3376 info->flags |= DF_TEXTREL; 3377 3378 sreloc->size += sizeof (Elf32_External_Rela); 3379 break; 3380 3381 case R_CRIS_8_PCREL: 3382 case R_CRIS_16_PCREL: 3383 case R_CRIS_32_PCREL: 3384 if (h != NULL) 3385 { 3386 h->non_got_ref = 1; 3387 3388 /* Make sure a plt entry is created for this symbol if it 3389 turns out to be a function defined by a dynamic object. */ 3390 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 3391 h->plt.refcount++; 3392 } 3393 3394 /* If we are creating a shared library and this is not a local 3395 symbol, we need to copy the reloc into the shared library. 3396 However when linking with -Bsymbolic and this is a global 3397 symbol which is defined in an object we are including in the 3398 link (i.e., DEF_REGULAR is set), then we can resolve the 3399 reloc directly. At this point we have not seen all the input 3400 files, so it is possible that DEF_REGULAR is not set now but 3401 will be set later (it is never cleared). In case of a weak 3402 definition, DEF_REGULAR may be cleared later by a strong 3403 definition in a shared library. We account for that 3404 possibility below by storing information in the relocs_copied 3405 field of the hash table entry. A similar situation occurs 3406 when creating shared libraries and symbol visibility changes 3407 render the symbol local. */ 3408 3409 /* No need to do anything if we're not creating a shared object. */ 3410 if (! bfd_link_pic (info)) 3411 break; 3412 3413 /* We don't need to handle relocs into sections not going into 3414 the "real" output. */ 3415 if ((sec->flags & SEC_ALLOC) == 0) 3416 break; 3417 3418 /* If the symbol is local, then we know already we can 3419 eliminate the reloc. */ 3420 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 3421 break; 3422 3423 /* If this is with -Bsymbolic and the symbol isn't weak, and 3424 is defined by an ordinary object (the ones we include in 3425 this shared library) then we can also eliminate the 3426 reloc. See comment above for more eliminable cases which 3427 we can't identify at this time. */ 3428 if (SYMBOLIC_BIND (info, h) 3429 && h->root.type != bfd_link_hash_defweak 3430 && h->def_regular) 3431 break; 3432 3433 /* We may need to create a reloc section in the dynobj and made room 3434 for this reloc. */ 3435 if (sreloc == NULL) 3436 { 3437 sreloc = _bfd_elf_make_dynamic_reloc_section 3438 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 3439 3440 if (sreloc == NULL) 3441 return FALSE; 3442 } 3443 3444 sreloc->size += sizeof (Elf32_External_Rela); 3445 3446 /* We count the number of PC relative relocations we have 3447 entered for this symbol, so that we can discard them 3448 again if the symbol is later defined by a regular object. 3449 We know that h is really a pointer to an 3450 elf_cris_link_hash_entry. */ 3451 { 3452 struct elf_cris_link_hash_entry *eh; 3453 struct elf_cris_pcrel_relocs_copied *p; 3454 3455 eh = elf_cris_hash_entry (h); 3456 3457 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 3458 if (p->section == sec) 3459 break; 3460 3461 if (p == NULL) 3462 { 3463 p = ((struct elf_cris_pcrel_relocs_copied *) 3464 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 3465 if (p == NULL) 3466 return FALSE; 3467 p->next = eh->pcrel_relocs_copied; 3468 eh->pcrel_relocs_copied = p; 3469 p->section = sec; 3470 p->count = 0; 3471 p->r_type = r_type; 3472 } 3473 3474 ++p->count; 3475 } 3476 break; 3477 3478 /* This relocation describes the C++ object vtable hierarchy. 3479 Reconstruct it for later use during GC. */ 3480 case R_CRIS_GNU_VTINHERIT: 3481 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 3482 return FALSE; 3483 break; 3484 3485 /* This relocation describes which C++ vtable entries are actually 3486 used. Record for later use during GC. */ 3487 case R_CRIS_GNU_VTENTRY: 3488 BFD_ASSERT (h != NULL); 3489 if (h != NULL 3490 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 3491 return FALSE; 3492 break; 3493 3494 case R_CRIS_16_TPREL: 3495 case R_CRIS_32_TPREL: 3496 /* Already warned above, when necessary. */ 3497 break; 3498 3499 default: 3500 /* Other relocs do not appear here. */ 3501 bfd_set_error (bfd_error_bad_value); 3502 return FALSE; 3503 } 3504 } 3505 3506 return TRUE; 3507 } 3508 3509 /* Set the sizes of the dynamic sections. */ 3510 3511 static bfd_boolean 3512 elf_cris_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 3513 struct bfd_link_info *info) 3514 { 3515 struct elf_cris_link_hash_table * htab; 3516 bfd *dynobj; 3517 asection *s; 3518 bfd_boolean plt; 3519 bfd_boolean relocs; 3520 3521 htab = elf_cris_hash_table (info); 3522 if (htab == NULL) 3523 return FALSE; 3524 3525 dynobj = htab->root.dynobj; 3526 BFD_ASSERT (dynobj != NULL); 3527 3528 if (htab->root.dynamic_sections_created) 3529 { 3530 /* Set the contents of the .interp section to the interpreter. */ 3531 if (bfd_link_executable (info) && !info->nointerp) 3532 { 3533 s = bfd_get_linker_section (dynobj, ".interp"); 3534 BFD_ASSERT (s != NULL); 3535 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 3536 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 3537 } 3538 } 3539 else 3540 { 3541 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */ 3542 elf_cris_link_hash_traverse (htab, elf_cris_adjust_gotplt_to_got, 3543 info); 3544 3545 /* We may have created entries in the .rela.got section. 3546 However, if we are not creating the dynamic sections, we will 3547 not actually use these entries. Reset the size of .rela.got, 3548 which will cause it to get stripped from the output file 3549 below. */ 3550 s = htab->root.srelgot; 3551 if (s != NULL) 3552 s->size = 0; 3553 } 3554 3555 /* If this is a -Bsymbolic shared link, then we need to discard all PC 3556 relative relocs against symbols defined in a regular object. We 3557 allocated space for them in the check_relocs routine, but we will not 3558 fill them in in the relocate_section routine. We also discard space 3559 for relocs that have become for local symbols due to symbol 3560 visibility changes. For programs, we discard space for relocs for 3561 symbols not referenced by any dynamic object. */ 3562 if (bfd_link_pic (info)) 3563 elf_cris_link_hash_traverse (htab, 3564 elf_cris_discard_excess_dso_dynamics, 3565 info); 3566 else 3567 elf_cris_link_hash_traverse (htab, 3568 elf_cris_discard_excess_program_dynamics, 3569 info); 3570 3571 /* The check_relocs and adjust_dynamic_symbol entry points have 3572 determined the sizes of the various dynamic sections. Allocate 3573 memory for them. */ 3574 plt = FALSE; 3575 relocs = FALSE; 3576 for (s = dynobj->sections; s != NULL; s = s->next) 3577 { 3578 const char *name; 3579 3580 if ((s->flags & SEC_LINKER_CREATED) == 0) 3581 continue; 3582 3583 /* It's OK to base decisions on the section name, because none 3584 of the dynobj section names depend upon the input files. */ 3585 name = bfd_get_section_name (dynobj, s); 3586 3587 if (strcmp (name, ".plt") == 0) 3588 { 3589 /* Remember whether there is a PLT. */ 3590 plt = s->size != 0; 3591 } 3592 else if (strcmp (name, ".got.plt") == 0) 3593 { 3594 /* The .got.plt contains the .got header as well as the 3595 actual .got.plt contents. The .got header may contain a 3596 R_CRIS_DTPMOD entry at index 3. */ 3597 s->size += htab->dtpmod_refcount != 0 3598 ? 8 : 0; 3599 } 3600 else if (CONST_STRNEQ (name, ".rela")) 3601 { 3602 if (strcmp (name, ".rela.got") == 0 3603 && htab->dtpmod_refcount != 0 3604 && bfd_link_pic (info)) 3605 s->size += sizeof (Elf32_External_Rela); 3606 3607 if (s->size != 0) 3608 { 3609 /* Remember whether there are any reloc sections other 3610 than .rela.plt. */ 3611 if (strcmp (name, ".rela.plt") != 0) 3612 relocs = TRUE; 3613 3614 /* We use the reloc_count field as a counter if we need 3615 to copy relocs into the output file. */ 3616 s->reloc_count = 0; 3617 } 3618 } 3619 else if (! CONST_STRNEQ (name, ".got") 3620 && strcmp (name, ".dynbss") != 0 3621 && s != htab->root.sdynrelro) 3622 { 3623 /* It's not one of our sections, so don't allocate space. */ 3624 continue; 3625 } 3626 3627 if (s->size == 0) 3628 { 3629 /* If we don't need this section, strip it from the 3630 output file. This is mostly to handle .rela.bss and 3631 .rela.plt. We must create both sections in 3632 create_dynamic_sections, because they must be created 3633 before the linker maps input sections to output 3634 sections. The linker does that before 3635 adjust_dynamic_symbol is called, and it is that 3636 function which decides whether anything needs to go 3637 into these sections. */ 3638 s->flags |= SEC_EXCLUDE; 3639 continue; 3640 } 3641 3642 if ((s->flags & SEC_HAS_CONTENTS) == 0) 3643 continue; 3644 3645 /* Allocate memory for the section contents. We use bfd_zalloc here 3646 in case unused entries are not reclaimed before the section's 3647 contents are written out. This should not happen, but this way 3648 if it does, we will not write out garbage. For reloc sections, 3649 this will make entries have the type R_CRIS_NONE. */ 3650 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 3651 if (s->contents == NULL) 3652 return FALSE; 3653 } 3654 3655 if (elf_hash_table (info)->dynamic_sections_created) 3656 { 3657 /* Add some entries to the .dynamic section. We fill in the 3658 values later, in elf_cris_finish_dynamic_sections, but we 3659 must add the entries now so that we get the correct size for 3660 the .dynamic section. The DT_DEBUG entry is filled in by the 3661 dynamic linker and used by the debugger. */ 3662 #define add_dynamic_entry(TAG, VAL) \ 3663 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3664 3665 if (!bfd_link_pic (info)) 3666 { 3667 if (!add_dynamic_entry (DT_DEBUG, 0)) 3668 return FALSE; 3669 } 3670 3671 if (plt) 3672 { 3673 if (!add_dynamic_entry (DT_PLTGOT, 0) 3674 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3675 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3676 || !add_dynamic_entry (DT_JMPREL, 0)) 3677 return FALSE; 3678 } 3679 3680 if (relocs) 3681 { 3682 if (!add_dynamic_entry (DT_RELA, 0) 3683 || !add_dynamic_entry (DT_RELASZ, 0) 3684 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3685 return FALSE; 3686 } 3687 3688 if ((info->flags & DF_TEXTREL) != 0) 3689 { 3690 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3691 return FALSE; 3692 info->flags |= DF_TEXTREL; 3693 } 3694 } 3695 #undef add_dynamic_entry 3696 3697 return TRUE; 3698 } 3699 3700 /* This function is called via elf_cris_link_hash_traverse if we are 3701 creating a shared object. In the -Bsymbolic case, it discards the 3702 space allocated to copy PC relative relocs against symbols which 3703 are defined in regular objects. For the normal non-symbolic case, 3704 we also discard space for relocs that have become local due to 3705 symbol visibility changes. We allocated space for them in the 3706 check_relocs routine, but we won't fill them in in the 3707 relocate_section routine. */ 3708 3709 static bfd_boolean 3710 elf_cris_discard_excess_dso_dynamics (struct elf_cris_link_hash_entry *h, 3711 void * inf) 3712 { 3713 struct elf_cris_pcrel_relocs_copied *s; 3714 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3715 3716 /* If a symbol has been forced local or we have found a regular 3717 definition for the symbolic link case, then we won't be needing 3718 any relocs. */ 3719 if (h->root.def_regular 3720 && (h->root.forced_local 3721 || SYMBOLIC_BIND (info, &h->root))) 3722 { 3723 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 3724 { 3725 asection *sreloc 3726 = _bfd_elf_get_dynamic_reloc_section (elf_hash_table (info) 3727 ->dynobj, 3728 s->section, 3729 /*rela?*/ TRUE); 3730 sreloc->size -= s->count * sizeof (Elf32_External_Rela); 3731 } 3732 return TRUE; 3733 } 3734 3735 /* If we have accounted for PC-relative relocs for read-only 3736 sections, now is the time to warn for them. We can't do it in 3737 cris_elf_check_relocs, because we don't know the status of all 3738 symbols at that time (and it's common to force symbols local 3739 late). */ 3740 3741 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 3742 if ((s->section->flags & SEC_READONLY) != 0) 3743 { 3744 /* FIXME: How do we make this optionally a warning only? */ 3745 _bfd_error_handler 3746 /* xgettext:c-format */ 3747 (_("%pB, section `%pA', to symbol `%s':" 3748 " relocation %s should not be used" 3749 " in a shared object; recompile with -fPIC"), 3750 s->section->owner, 3751 s->section, 3752 h->root.root.root.string, 3753 cris_elf_howto_table[s->r_type].name); 3754 3755 info->flags |= DF_TEXTREL; 3756 } 3757 3758 return TRUE; 3759 } 3760 3761 /* This function is called via elf_cris_link_hash_traverse if we are *not* 3762 creating a shared object. We discard space for relocs for symbols put 3763 in the .got, but which we found we do not have to resolve at run-time. */ 3764 3765 static bfd_boolean 3766 elf_cris_discard_excess_program_dynamics (struct elf_cris_link_hash_entry *h, 3767 void * inf) 3768 { 3769 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3770 3771 /* If we're not creating a shared library and have a symbol which is 3772 referred to by .got references, but the symbol is defined locally, 3773 (or rather, not defined by a DSO) then lose the reloc for the .got 3774 (don't allocate room for it). Likewise for relocs for something 3775 for which we create a PLT. */ 3776 if (!h->root.def_dynamic 3777 || h->root.plt.refcount > 0) 3778 { 3779 if (h->reg_got_refcount > 0 3780 /* The size of this section is only valid and in sync with the 3781 various reference counts if we do dynamic; don't decrement it 3782 otherwise. */ 3783 && elf_hash_table (info)->dynamic_sections_created) 3784 { 3785 bfd *dynobj = elf_hash_table (info)->dynobj; 3786 asection *srelgot = elf_hash_table (info)->srelgot; 3787 3788 BFD_ASSERT (dynobj != NULL); 3789 BFD_ASSERT (srelgot != NULL); 3790 3791 srelgot->size -= sizeof (Elf32_External_Rela); 3792 } 3793 3794 /* If the locally-defined symbol isn't used by a DSO, then we don't 3795 have to export it as a dynamic symbol. This was already done for 3796 functions; doing this for all symbols would presumably not 3797 introduce new problems. Of course we don't do this if we're 3798 exporting all dynamic symbols, or all data symbols, regardless of 3799 them being referenced or not. */ 3800 if (! (info->export_dynamic 3801 || (h->root.type != STT_FUNC && info->dynamic_data)) 3802 && h->root.dynindx != -1 3803 && !h->root.dynamic 3804 && !h->root.def_dynamic 3805 && !h->root.ref_dynamic) 3806 { 3807 h->root.dynindx = -1; 3808 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 3809 h->root.dynstr_index); 3810 } 3811 } 3812 3813 return TRUE; 3814 } 3815 3816 /* Reject a file depending on presence and expectation of prefixed 3817 underscores on symbols. */ 3818 3819 static bfd_boolean 3820 cris_elf_object_p (bfd *abfd) 3821 { 3822 if (! cris_elf_set_mach_from_flags (abfd, elf_elfheader (abfd)->e_flags)) 3823 return FALSE; 3824 3825 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)) 3826 return (bfd_get_symbol_leading_char (abfd) == '_'); 3827 else 3828 return (bfd_get_symbol_leading_char (abfd) == 0); 3829 } 3830 3831 /* Mark presence or absence of leading underscore. Set machine type 3832 flags from mach type. */ 3833 3834 static void 3835 cris_elf_final_write_processing (bfd *abfd, 3836 bfd_boolean linker ATTRIBUTE_UNUSED) 3837 { 3838 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 3839 3840 e_flags &= ~EF_CRIS_UNDERSCORE; 3841 if (bfd_get_symbol_leading_char (abfd) == '_') 3842 e_flags |= EF_CRIS_UNDERSCORE; 3843 3844 switch (bfd_get_mach (abfd)) 3845 { 3846 case bfd_mach_cris_v0_v10: 3847 e_flags |= EF_CRIS_VARIANT_ANY_V0_V10; 3848 break; 3849 3850 case bfd_mach_cris_v10_v32: 3851 e_flags |= EF_CRIS_VARIANT_COMMON_V10_V32; 3852 break; 3853 3854 case bfd_mach_cris_v32: 3855 e_flags |= EF_CRIS_VARIANT_V32; 3856 break; 3857 3858 default: 3859 _bfd_abort (__FILE__, __LINE__, 3860 _("unexpected machine number")); 3861 } 3862 3863 elf_elfheader (abfd)->e_flags = e_flags; 3864 } 3865 3866 /* Set the mach type from e_flags value. */ 3867 3868 static bfd_boolean 3869 cris_elf_set_mach_from_flags (bfd *abfd, 3870 unsigned long flags) 3871 { 3872 switch (flags & EF_CRIS_VARIANT_MASK) 3873 { 3874 case EF_CRIS_VARIANT_ANY_V0_V10: 3875 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v0_v10); 3876 break; 3877 3878 case EF_CRIS_VARIANT_V32: 3879 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v32); 3880 break; 3881 3882 case EF_CRIS_VARIANT_COMMON_V10_V32: 3883 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v10_v32); 3884 break; 3885 3886 default: 3887 /* Since we don't recognize them, we obviously can't support them 3888 with this code; we'd have to require that all future handling 3889 would be optional. */ 3890 bfd_set_error (bfd_error_wrong_format); 3891 return FALSE; 3892 } 3893 3894 return TRUE; 3895 } 3896 3897 /* Display the flags field. */ 3898 3899 static bfd_boolean 3900 cris_elf_print_private_bfd_data (bfd *abfd, void * ptr) 3901 { 3902 FILE *file = (FILE *) ptr; 3903 3904 BFD_ASSERT (abfd != NULL && ptr != NULL); 3905 3906 _bfd_elf_print_private_bfd_data (abfd, ptr); 3907 3908 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 3909 3910 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE) 3911 fprintf (file, _(" [symbols have a _ prefix]")); 3912 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) 3913 == EF_CRIS_VARIANT_COMMON_V10_V32) 3914 fprintf (file, _(" [v10 and v32]")); 3915 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) 3916 == EF_CRIS_VARIANT_V32) 3917 fprintf (file, _(" [v32]")); 3918 3919 fputc ('\n', file); 3920 return TRUE; 3921 } 3922 3923 /* Don't mix files with and without a leading underscore. */ 3924 3925 static bfd_boolean 3926 cris_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 3927 { 3928 bfd *obfd = info->output_bfd; 3929 int imach, omach; 3930 3931 if (! _bfd_generic_verify_endian_match (ibfd, info)) 3932 return FALSE; 3933 3934 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 3935 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 3936 return TRUE; 3937 3938 imach = bfd_get_mach (ibfd); 3939 3940 if (! elf_flags_init (obfd)) 3941 { 3942 /* This happens when ld starts out with a 'blank' output file. */ 3943 elf_flags_init (obfd) = TRUE; 3944 3945 /* We ignore the linker-set mach, and instead set it according to 3946 the first input file. This would also happen if we could 3947 somehow filter out the OUTPUT_ARCH () setting from elf.sc. 3948 This allows us to keep the same linker config across 3949 cris(v0..v10) and crisv32. The drawback is that we can't force 3950 the output type, which might be a sane thing to do for a 3951 v10+v32 compatibility object. */ 3952 if (! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) 3953 return FALSE; 3954 } 3955 3956 if (bfd_get_symbol_leading_char (ibfd) 3957 != bfd_get_symbol_leading_char (obfd)) 3958 { 3959 _bfd_error_handler 3960 (bfd_get_symbol_leading_char (ibfd) == '_' 3961 ? _("%pB: uses _-prefixed symbols, but writing file with non-prefixed symbols") 3962 : _("%pB: uses non-prefixed symbols, but writing file with _-prefixed symbols"), 3963 ibfd); 3964 bfd_set_error (bfd_error_bad_value); 3965 return FALSE; 3966 } 3967 3968 omach = bfd_get_mach (obfd); 3969 3970 if (imach != omach) 3971 { 3972 /* We can get an incompatible combination only if either is 3973 bfd_mach_cris_v32, and the other one isn't compatible. */ 3974 if ((imach == bfd_mach_cris_v32 3975 && omach != bfd_mach_cris_v10_v32) 3976 || (omach == bfd_mach_cris_v32 3977 && imach != bfd_mach_cris_v10_v32)) 3978 { 3979 _bfd_error_handler 3980 ((imach == bfd_mach_cris_v32) 3981 ? _("%pB contains CRIS v32 code, incompatible" 3982 " with previous objects") 3983 : _("%pB contains non-CRIS-v32 code, incompatible" 3984 " with previous objects"), 3985 ibfd); 3986 bfd_set_error (bfd_error_bad_value); 3987 return FALSE; 3988 } 3989 3990 /* We don't have to check the case where the input is compatible 3991 with v10 and v32, because the output is already known to be set 3992 to the other (compatible) mach. */ 3993 if (omach == bfd_mach_cris_v10_v32 3994 && ! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) 3995 return FALSE; 3996 } 3997 3998 return TRUE; 3999 } 4000 4001 /* Do side-effects of e_flags copying to obfd. */ 4002 4003 static bfd_boolean 4004 cris_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 4005 { 4006 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 4007 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 4008 return TRUE; 4009 4010 /* Call the base function. */ 4011 if (!_bfd_elf_copy_private_bfd_data (ibfd, obfd)) 4012 return FALSE; 4013 4014 /* Do what we really came here for. */ 4015 return bfd_set_arch_mach (obfd, bfd_arch_cris, bfd_get_mach (ibfd)); 4016 } 4017 4018 static enum elf_reloc_type_class 4019 elf_cris_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 4020 const asection *rel_sec ATTRIBUTE_UNUSED, 4021 const Elf_Internal_Rela *rela) 4022 { 4023 enum elf_cris_reloc_type r_type = ELF32_R_TYPE (rela->r_info); 4024 switch (r_type) 4025 { 4026 case R_CRIS_RELATIVE: 4027 return reloc_class_relative; 4028 case R_CRIS_JUMP_SLOT: 4029 return reloc_class_plt; 4030 case R_CRIS_COPY: 4031 return reloc_class_copy; 4032 default: 4033 return reloc_class_normal; 4034 } 4035 } 4036 4037 /* The elf_backend_got_elt_size worker. For one symbol, we can have up to 4038 two GOT entries from three types with two different sizes. We handle 4039 it as a single entry, so we can use the regular offset-calculation 4040 machinery. */ 4041 4042 static bfd_vma 4043 elf_cris_got_elt_size (bfd *abfd ATTRIBUTE_UNUSED, 4044 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4045 struct elf_link_hash_entry *hr, 4046 bfd *ibfd, 4047 unsigned long symndx) 4048 { 4049 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) hr; 4050 bfd_vma eltsiz = 0; 4051 4052 /* We may have one regular GOT entry or up to two TLS GOT 4053 entries. */ 4054 if (h == NULL) 4055 { 4056 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 4057 bfd_signed_vma *local_got_refcounts = elf_local_got_refcounts (ibfd); 4058 4059 BFD_ASSERT (local_got_refcounts != NULL); 4060 4061 if (local_got_refcounts[LGOT_REG_NDX (symndx)] > 0) 4062 { 4063 /* We can't have a variable referred to both as a regular 4064 variable and through TLS relocs. */ 4065 BFD_ASSERT (local_got_refcounts[LGOT_DTP_NDX (symndx)] == 0 4066 && local_got_refcounts[LGOT_TPREL_NDX (symndx)] == 0); 4067 return 4; 4068 } 4069 4070 if (local_got_refcounts[LGOT_DTP_NDX (symndx)] > 0) 4071 eltsiz += 8; 4072 4073 if (local_got_refcounts[LGOT_TPREL_NDX (symndx)] > 0) 4074 eltsiz += 4; 4075 } 4076 else 4077 { 4078 struct elf_cris_link_hash_entry *hh = elf_cris_hash_entry (h); 4079 if (hh->reg_got_refcount > 0) 4080 { 4081 /* The actual error-on-input is emitted elsewhere. */ 4082 BFD_ASSERT (hh->dtp_refcount == 0 && hh->tprel_refcount == 0); 4083 return 4; 4084 } 4085 4086 if (hh->dtp_refcount > 0) 4087 eltsiz += 8; 4088 4089 if (hh->tprel_refcount > 0) 4090 eltsiz += 4; 4091 } 4092 4093 /* We're only called when h->got.refcount is non-zero, so we must 4094 have a non-zero size. */ 4095 BFD_ASSERT (eltsiz != 0); 4096 return eltsiz; 4097 } 4098 4099 #define ELF_ARCH bfd_arch_cris 4100 #define ELF_TARGET_ID CRIS_ELF_DATA 4101 #define ELF_MACHINE_CODE EM_CRIS 4102 #define ELF_MAXPAGESIZE 0x2000 4103 4104 #define TARGET_LITTLE_SYM cris_elf32_vec 4105 #define TARGET_LITTLE_NAME "elf32-cris" 4106 #define elf_symbol_leading_char 0 4107 4108 #define elf_info_to_howto_rel NULL 4109 #define elf_info_to_howto cris_info_to_howto_rela 4110 #define elf_backend_relocate_section cris_elf_relocate_section 4111 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook 4112 #define elf_backend_plt_sym_val cris_elf_plt_sym_val 4113 #define elf_backend_check_relocs cris_elf_check_relocs 4114 #define elf_backend_grok_prstatus cris_elf_grok_prstatus 4115 #define elf_backend_grok_psinfo cris_elf_grok_psinfo 4116 4117 #define elf_backend_can_gc_sections 1 4118 #define elf_backend_can_refcount 1 4119 4120 #define elf_backend_object_p cris_elf_object_p 4121 #define elf_backend_final_write_processing \ 4122 cris_elf_final_write_processing 4123 #define bfd_elf32_bfd_print_private_bfd_data \ 4124 cris_elf_print_private_bfd_data 4125 #define bfd_elf32_bfd_merge_private_bfd_data \ 4126 cris_elf_merge_private_bfd_data 4127 #define bfd_elf32_bfd_copy_private_bfd_data \ 4128 cris_elf_copy_private_bfd_data 4129 4130 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup 4131 #define bfd_elf32_bfd_reloc_name_lookup cris_reloc_name_lookup 4132 4133 #define bfd_elf32_bfd_link_hash_table_create \ 4134 elf_cris_link_hash_table_create 4135 #define elf_backend_adjust_dynamic_symbol \ 4136 elf_cris_adjust_dynamic_symbol 4137 #define elf_backend_copy_indirect_symbol \ 4138 elf_cris_copy_indirect_symbol 4139 #define elf_backend_size_dynamic_sections \ 4140 elf_cris_size_dynamic_sections 4141 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4142 #define elf_backend_finish_dynamic_symbol \ 4143 elf_cris_finish_dynamic_symbol 4144 #define elf_backend_finish_dynamic_sections \ 4145 elf_cris_finish_dynamic_sections 4146 #define elf_backend_create_dynamic_sections \ 4147 _bfd_elf_create_dynamic_sections 4148 #define bfd_elf32_bfd_final_link \ 4149 bfd_elf_gc_common_final_link 4150 #define elf_backend_hide_symbol elf_cris_hide_symbol 4151 #define elf_backend_reloc_type_class elf_cris_reloc_type_class 4152 4153 #define elf_backend_want_got_plt 1 4154 #define elf_backend_plt_readonly 1 4155 #define elf_backend_want_plt_sym 0 4156 #define elf_backend_got_header_size 12 4157 #define elf_backend_got_elt_size elf_cris_got_elt_size 4158 #define elf_backend_dtrel_excludes_plt 1 4159 #define elf_backend_want_dynrelro 1 4160 4161 /* Later, we my want to optimize RELA entries into REL entries for dynamic 4162 linking and libraries (if it's a win of any significance). Until then, 4163 take the easy route. */ 4164 #define elf_backend_may_use_rel_p 0 4165 #define elf_backend_may_use_rela_p 1 4166 #define elf_backend_rela_normal 1 4167 4168 #define elf_backend_linux_prpsinfo32_ugid16 TRUE 4169 4170 #include "elf32-target.h" 4171 4172 #undef TARGET_LITTLE_SYM 4173 #undef TARGET_LITTLE_NAME 4174 #undef elf_symbol_leading_char 4175 4176 #define TARGET_LITTLE_SYM cris_elf32_us_vec 4177 #define TARGET_LITTLE_NAME "elf32-us-cris" 4178 #define elf_symbol_leading_char '_' 4179 #undef elf32_bed 4180 #define elf32_bed elf32_us_cris_bed 4181 4182 #include "elf32-target.h" 4183