1/* x86 specific support for ELF 2 Copyright (C) 2017-2020 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21#include "sysdep.h" 22#include "bfd.h" 23#include "bfdlink.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "hashtab.h" 27#include "elf-linker-x86.h" 28 29#define PLT_CIE_LENGTH 20 30#define PLT_FDE_LENGTH 36 31#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 32#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 33 34#define ABI_64_P(abfd) \ 35 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64) 36 37/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 38 copying dynamic variables from a shared lib into an app's dynbss 39 section, and instead use a dynamic relocation to point into the 40 shared lib. */ 41#define ELIMINATE_COPY_RELOCS 1 42 43#define elf_x86_hash_table(p, id) \ 44 (is_elf_hash_table ((p)->hash) \ 45 && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \ 46 ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL) 47 48/* Will references to this symbol always be local in this object? */ 49#define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \ 50 _bfd_x86_elf_link_symbol_references_local ((INFO), (H)) 51 52/* TRUE if an undefined weak symbol should be resolved to 0. Local 53 undefined weak symbol is always resolved to 0. Reference to an 54 undefined weak symbol is resolved to 0 in executable if undefined 55 weak symbol should be resolved to 0 (zero_undefweak > 0). */ 56#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \ 57 ((EH)->elf.root.type == bfd_link_hash_undefweak \ 58 && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \ 59 || (bfd_link_executable (INFO) \ 60 && (EH)->zero_undefweak > 0))) 61 62/* Should copy relocation be generated for a symbol. Don't generate 63 copy relocation against a protected symbol defined in a shared 64 object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */ 65#define SYMBOL_NO_COPYRELOC(INFO, EH) \ 66 ((EH)->def_protected \ 67 && ((EH)->elf.root.type == bfd_link_hash_defined \ 68 || (EH)->elf.root.type == bfd_link_hash_defweak) \ 69 && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \ 70 && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \ 71 && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0) 72 73/* TRUE if dynamic relocation is needed. If we are creating a shared 74 library, and this is a reloc against a global symbol, or a non PC 75 relative reloc against a local symbol, then we need to copy the reloc 76 into the shared library. However, if we are linking with -Bsymbolic, 77 we do not need to copy a reloc against a global symbol which is 78 defined in an object we are including in the link (i.e., DEF_REGULAR 79 is set). 80 81 If PCREL_PLT is true, don't generate dynamic relocation in PIE for 82 PC-relative relocation against a dynamic function definition in data 83 section when PLT address can be used. 84 85 If on the other hand, we are creating an executable, we may need to 86 keep relocations for symbols satisfied by a dynamic library if we 87 manage to avoid copy relocs for the symbol. 88 89 We also need to generate dynamic pointer relocation against 90 STT_GNU_IFUNC symbol in the non-code section. */ 91#define NEED_DYNAMIC_RELOCATION_P(INFO, PCREL_PLT, H, SEC, R_TYPE, \ 92 POINTER_TYPE) \ 93 ((bfd_link_pic (INFO) \ 94 && (! X86_PCREL_TYPE_P (R_TYPE) \ 95 || ((H) != NULL \ 96 && (! (bfd_link_pie (INFO) \ 97 || SYMBOLIC_BIND ((INFO), (H))) \ 98 || (H)->root.type == bfd_link_hash_defweak \ 99 || (!(bfd_link_pie (INFO) \ 100 && (PCREL_PLT) \ 101 && (H)->plt.refcount > 0 \ 102 && ((SEC)->flags & SEC_CODE) == 0 \ 103 && (H)->type == STT_FUNC \ 104 && (H)->def_dynamic) \ 105 && !(H)->def_regular))))) \ 106 || ((H) != NULL \ 107 && (H)->type == STT_GNU_IFUNC \ 108 && (R_TYPE) == POINTER_TYPE \ 109 && ((SEC)->flags & SEC_CODE) == 0) \ 110 || (ELIMINATE_COPY_RELOCS \ 111 && !bfd_link_pic (INFO) \ 112 && (H) != NULL \ 113 && ((H)->root.type == bfd_link_hash_defweak \ 114 || !(H)->def_regular))) 115 116/* TRUE if dynamic relocation should be generated. Don't copy a 117 pc-relative relocation into the output file if the symbol needs 118 copy reloc or the symbol is undefined when building executable. 119 Copy dynamic function pointer relocations. Don't generate dynamic 120 relocations against resolved undefined weak symbols in PIE, except 121 when PC32_RELOC is TRUE. Undefined weak symbol is bound locally 122 when PIC is false. */ 123#define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \ 124 NEED_COPY_RELOC_IN_PIE, \ 125 RESOLVED_TO_ZERO, PC32_RELOC) \ 126 ((bfd_link_pic (INFO) \ 127 && !(NEED_COPY_RELOC_IN_PIE) \ 128 && ((EH) == NULL \ 129 || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \ 130 && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \ 131 || (EH)->elf.root.type != bfd_link_hash_undefweak)) \ 132 && ((!X86_PCREL_TYPE_P (R_TYPE) \ 133 && !X86_SIZE_TYPE_P (R_TYPE)) \ 134 || ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \ 135 || (ELIMINATE_COPY_RELOCS \ 136 && !bfd_link_pic (INFO) \ 137 && (EH) != NULL \ 138 && (EH)->elf.dynindx != -1 \ 139 && (!(EH)->elf.non_got_ref \ 140 || ((EH)->elf.root.type == bfd_link_hash_undefweak \ 141 && !(RESOLVED_TO_ZERO))) \ 142 && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \ 143 || (EH)->elf.root.type == bfd_link_hash_undefined))) 144 145/* TRUE if this input relocation should be copied to output. H->dynindx 146 may be -1 if this symbol was marked to become local. */ 147#define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \ 148 ((H) != NULL \ 149 && (H)->dynindx != -1 \ 150 && (X86_PCREL_TYPE_P (R_TYPE) \ 151 || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \ 152 || !(H)->def_regular)) 153 154/* TRUE if this is actually a static link, or it is a -Bsymbolic link 155 and the symbol is defined locally, or the symbol was forced to be 156 local because of a version file. */ 157#define RESOLVED_LOCALLY_P(INFO, H, HTAB) \ 158 (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \ 159 bfd_link_pic (INFO), (H)) \ 160 || (bfd_link_pic (INFO) \ 161 && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \ 162 || (ELF_ST_VISIBILITY ((H)->other) \ 163 && (H)->root.type == bfd_link_hash_undefweak)) 164 165/* TRUE if this symbol isn't defined by a shared object. */ 166#define SYMBOL_DEFINED_NON_SHARED_P(H) \ 167 ((H)->def_regular \ 168 || (H)->root.linker_def \ 169 || (H)->root.ldscript_def \ 170 || ((struct elf_x86_link_hash_entry *) (H))->linker_def \ 171 || ELF_COMMON_DEF_P (H)) 172 173/* TRUE if relative relocation should be generated. GOT reference to 174 global symbol in PIC will lead to dynamic symbol. It becomes a 175 problem when "time" or "times" is defined as a variable in an 176 executable, clashing with functions of the same name in libc. If a 177 symbol isn't undefined weak symbol, don't make it dynamic in PIC and 178 generate relative relocation. */ 179#define GENERATE_RELATIVE_RELOC_P(INFO, H) \ 180 ((H)->dynindx == -1 \ 181 && !(H)->forced_local \ 182 && (H)->root.type != bfd_link_hash_undefweak \ 183 && bfd_link_pic (INFO)) 184 185/* TRUE if this is a pointer reference to a local IFUNC. */ 186#define POINTER_LOCAL_IFUNC_P(INFO, H) \ 187 ((H)->dynindx == -1 \ 188 || (H)->forced_local \ 189 || bfd_link_executable (INFO)) 190 191/* TRUE if this is a PLT reference to a local IFUNC. */ 192#define PLT_LOCAL_IFUNC_P(INFO, H) \ 193 ((H)->dynindx == -1 \ 194 || ((bfd_link_executable (INFO) \ 195 || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \ 196 && (H)->def_regular \ 197 && (H)->type == STT_GNU_IFUNC)) 198 199/* TRUE if TLS IE->LE transition is OK. */ 200#define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \ 201 (bfd_link_executable (INFO) \ 202 && (H) != NULL \ 203 && (H)->dynindx == -1 \ 204 && (TLS_TYPE & GOT_TLS_IE)) 205 206/* Verify that the symbol has an entry in the procedure linkage table. */ 207#define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \ 208 do \ 209 { \ 210 if (((H)->dynindx == -1 \ 211 && !LOCAL_UNDEFWEAK \ 212 && !(((H)->forced_local || bfd_link_executable (INFO)) \ 213 && (H)->def_regular \ 214 && (H)->type == STT_GNU_IFUNC)) \ 215 || (PLT) == NULL \ 216 || (GOTPLT) == NULL \ 217 || (RELPLT) == NULL) \ 218 abort (); \ 219 } \ 220 while (0); 221 222/* Verify that the symbol supports copy relocation. */ 223#define VERIFY_COPY_RELOC(H, HTAB) \ 224 do \ 225 { \ 226 if ((H)->dynindx == -1 \ 227 || ((H)->root.type != bfd_link_hash_defined \ 228 && (H)->root.type != bfd_link_hash_defweak) \ 229 || (HTAB)->elf.srelbss == NULL \ 230 || (HTAB)->elf.sreldynrelro == NULL) \ 231 abort (); \ 232 } \ 233 while (0); 234 235/* x86 ELF linker hash entry. */ 236 237struct elf_x86_link_hash_entry 238{ 239 struct elf_link_hash_entry elf; 240 241 /* Track dynamic relocs copied for this symbol. */ 242 struct elf_dyn_relocs *dyn_relocs; 243 244 unsigned char tls_type; 245 246 /* Bit 0: Symbol has no GOT nor PLT relocations. 247 Bit 1: Symbol has non-GOT/non-PLT relocations in text sections. 248 zero_undefweak is initialized to 1 and undefined weak symbol 249 should be resolved to 0 if zero_undefweak > 0. */ 250 unsigned int zero_undefweak : 2; 251 252 /* Don't call finish_dynamic_symbol on this symbol. */ 253 unsigned int no_finish_dynamic_symbol : 1; 254 255 /* TRUE if symbol is __tls_get_addr. */ 256 unsigned int tls_get_addr : 1; 257 258 /* TRUE if symbol is defined as a protected symbol. */ 259 unsigned int def_protected : 1; 260 261 /* 0: Symbol references are unknown. 262 1: Symbol references aren't local. 263 2: Symbol references are local. 264 */ 265 unsigned int local_ref : 2; 266 267 /* TRUE if symbol is defined by linker. */ 268 unsigned int linker_def : 1; 269 270 /* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is 271 only used by i386. */ 272 unsigned int gotoff_ref : 1; 273 274 /* TRUE if a weak symbol with a real definition needs a copy reloc. 275 When there is a weak symbol with a real definition, the processor 276 independent code will have arranged for us to see the real 277 definition first. We need to copy the needs_copy bit from the 278 real definition and check it when allowing copy reloc in PIE. This 279 is only used by x86-64. */ 280 unsigned int needs_copy : 1; 281 282 /* Information about the GOT PLT entry. Filled when there are both 283 GOT and PLT relocations against the same function. */ 284 union gotplt_union plt_got; 285 286 /* Information about the second PLT entry. */ 287 union gotplt_union plt_second; 288 289 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 290 starting at the end of the jump table. */ 291 bfd_vma tlsdesc_got; 292}; 293 294struct elf_x86_lazy_plt_layout 295{ 296 /* The first entry in a lazy procedure linkage table looks like this. */ 297 const bfd_byte *plt0_entry; 298 unsigned int plt0_entry_size; /* Size of PLT0 entry. */ 299 300 /* Later entries in a lazy procedure linkage table look like this. */ 301 const bfd_byte *plt_entry; 302 unsigned int plt_entry_size; /* Size of each PLT entry. */ 303 304 /* The TLSDESC entry in a lazy procedure linkage table looks like 305 this. This is for x86-64 only. */ 306 const bfd_byte *plt_tlsdesc_entry; 307 unsigned int plt_tlsdesc_entry_size; /* Size of TLSDESC entry. */ 308 309 /* Offsets into the TLSDESC entry that are to be replaced with 310 GOT+8 and GOT+TDG. These are for x86-64 only. */ 311 unsigned int plt_tlsdesc_got1_offset; 312 unsigned int plt_tlsdesc_got2_offset; 313 314 /* Offset of the end of the PC-relative instructions containing 315 plt_tlsdesc_got1_offset and plt_tlsdesc_got2_offset. These 316 are for x86-64 only. */ 317 unsigned int plt_tlsdesc_got1_insn_end; 318 unsigned int plt_tlsdesc_got2_insn_end; 319 320 /* Offsets into plt0_entry that are to be replaced with GOT[1] and 321 GOT[2]. */ 322 unsigned int plt0_got1_offset; 323 unsigned int plt0_got2_offset; 324 325 /* Offset of the end of the PC-relative instruction containing 326 plt0_got2_offset. This is for x86-64 only. */ 327 unsigned int plt0_got2_insn_end; 328 329 /* Offsets into plt_entry that are to be replaced with... */ 330 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 331 unsigned int plt_reloc_offset; /* ... offset into relocation table. */ 332 unsigned int plt_plt_offset; /* ... offset to start of .plt. */ 333 334 /* Length of the PC-relative instruction containing plt_got_offset. 335 This is used for x86-64 only. */ 336 unsigned int plt_got_insn_size; 337 338 /* Offset of the end of the PC-relative jump to plt0_entry. This is 339 used for x86-64 only. */ 340 unsigned int plt_plt_insn_end; 341 342 /* Offset into plt_entry where the initial value of the GOT entry 343 points. */ 344 unsigned int plt_lazy_offset; 345 346 /* The first entry in a PIC lazy procedure linkage table looks like 347 this. */ 348 const bfd_byte *pic_plt0_entry; 349 350 /* Subsequent entries in a PIC lazy procedure linkage table look 351 like this. */ 352 const bfd_byte *pic_plt_entry; 353 354 /* .eh_frame covering the lazy .plt section. */ 355 const bfd_byte *eh_frame_plt; 356 unsigned int eh_frame_plt_size; 357}; 358 359struct elf_x86_non_lazy_plt_layout 360{ 361 /* Entries in a non-lazy procedure linkage table look like this. */ 362 const bfd_byte *plt_entry; 363 /* Entries in a PIC non-lazy procedure linkage table look like this. 364 This is only used for i386 where absolute PLT and PIC PLT are 365 different. */ 366 const bfd_byte *pic_plt_entry; 367 368 unsigned int plt_entry_size; /* Size of each PLT entry. */ 369 370 /* Offsets into plt_entry that are to be replaced with... */ 371 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 372 373 /* Length of the PC-relative instruction containing plt_got_offset. 374 This is used for x86-64 only. */ 375 unsigned int plt_got_insn_size; 376 377 /* .eh_frame covering the non-lazy .plt section. */ 378 const bfd_byte *eh_frame_plt; 379 unsigned int eh_frame_plt_size; 380}; 381 382struct elf_x86_plt_layout 383{ 384 /* The first entry in a lazy procedure linkage table looks like this. */ 385 const bfd_byte *plt0_entry; 386 /* Entries in a procedure linkage table look like this. */ 387 const bfd_byte *plt_entry; 388 unsigned int plt_entry_size; /* Size of each PLT entry. */ 389 390 /* 1 has PLT0. */ 391 unsigned int has_plt0; 392 393 /* Offsets into plt_entry that are to be replaced with... */ 394 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 395 396 /* Length of the PC-relative instruction containing plt_got_offset. 397 This is only used for x86-64. */ 398 unsigned int plt_got_insn_size; 399 400 /* Alignment of the .iplt section. */ 401 unsigned int iplt_alignment; 402 403 /* .eh_frame covering the .plt section. */ 404 const bfd_byte *eh_frame_plt; 405 unsigned int eh_frame_plt_size; 406}; 407 408/* Values in tls_type of x86 ELF linker hash entry. */ 409#define GOT_UNKNOWN 0 410#define GOT_NORMAL 1 411#define GOT_TLS_GD 2 412#define GOT_TLS_IE 4 413#define GOT_TLS_IE_POS 5 414#define GOT_TLS_IE_NEG 6 415#define GOT_TLS_IE_BOTH 7 416#define GOT_TLS_GDESC 8 417#define GOT_TLS_GD_BOTH_P(type) \ 418 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 419#define GOT_TLS_GD_P(type) \ 420 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 421#define GOT_TLS_GDESC_P(type) \ 422 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 423#define GOT_TLS_GD_ANY_P(type) \ 424 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 425 426#define elf_x86_hash_entry(ent) \ 427 ((struct elf_x86_link_hash_entry *)(ent)) 428 429enum elf_x86_target_os 430{ 431 is_normal, 432 is_solaris, 433 is_vxworks, 434 is_nacl 435}; 436 437/* x86 ELF linker hash table. */ 438 439struct elf_x86_link_hash_table 440{ 441 struct elf_link_hash_table elf; 442 443 /* Short-cuts to get to dynamic linker sections. */ 444 asection *interp; 445 asection *plt_eh_frame; 446 asection *plt_second; 447 asection *plt_second_eh_frame; 448 asection *plt_got; 449 asection *plt_got_eh_frame; 450 451 /* Parameters describing PLT generation, lazy or non-lazy. */ 452 struct elf_x86_plt_layout plt; 453 454 /* Parameters describing lazy PLT generation. */ 455 const struct elf_x86_lazy_plt_layout *lazy_plt; 456 457 /* Parameters describing non-lazy PLT generation. */ 458 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 459 460 union 461 { 462 bfd_signed_vma refcount; 463 bfd_vma offset; 464 } tls_ld_or_ldm_got; 465 466 /* The amount of space used by the jump slots in the GOT. */ 467 bfd_vma sgotplt_jump_table_size; 468 469 /* Small local sym cache. */ 470 struct sym_cache sym_cache; 471 472 /* _TLS_MODULE_BASE_ symbol. */ 473 struct bfd_link_hash_entry *tls_module_base; 474 475 /* Used by local STT_GNU_IFUNC symbols. */ 476 htab_t loc_hash_table; 477 void * loc_hash_memory; 478 479 /* The offset into sgot of the GOT entry used by the PLT entry 480 above. */ 481 bfd_vma tlsdesc_got; 482 483 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */ 484 bfd_vma next_jump_slot_index; 485 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */ 486 bfd_vma next_irelative_index; 487 488 /* TRUE if there are dynamic relocs against IFUNC symbols that apply 489 to read-only sections. */ 490 bfd_boolean readonly_dynrelocs_against_ifunc; 491 492 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. 493 This is used for i386 only. */ 494 asection *srelplt2; 495 496 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This 497 is only used for i386. */ 498 bfd_vma next_tls_desc_index; 499 500 /* The offset into splt of the PLT entry for the TLS descriptor 501 resolver. Special values are 0, if not necessary (or not found 502 to be necessary yet), and -1 if needed but not determined 503 yet. This is only used for x86-64. */ 504 bfd_vma tlsdesc_plt; 505 506 /* Value used to fill the unused bytes of the first PLT entry. This 507 is only used for i386. */ 508 bfd_byte plt0_pad_byte; 509 510 /* TRUE if GOT is referenced. */ 511 unsigned int got_referenced : 1; 512 513 /* TRUE if PLT is PC-relative. PLT in PDE and PC-relative PLT in PIE 514 can be used as function address. 515 516 NB: i386 has non-PIC PLT and PIC PLT. Only non-PIC PLT in PDE can 517 be used as function address. PIC PLT in PIE can't be used as 518 function address. */ 519 unsigned int pcrel_plt : 1; 520 521 bfd_vma (*r_info) (bfd_vma, bfd_vma); 522 bfd_vma (*r_sym) (bfd_vma); 523 bfd_boolean (*is_reloc_section) (const char *); 524 enum elf_target_id target_id; 525 enum elf_x86_target_os target_os; 526 unsigned int sizeof_reloc; 527 unsigned int dt_reloc; 528 unsigned int dt_reloc_sz; 529 unsigned int dt_reloc_ent; 530 unsigned int got_entry_size; 531 unsigned int pointer_r_type; 532 int dynamic_interpreter_size; 533 const char *dynamic_interpreter; 534 const char *tls_get_addr; 535 536 /* Options passed from the linker. */ 537 struct elf_linker_x86_params *params; 538}; 539 540/* Architecture-specific backend data for x86. */ 541 542struct elf_x86_backend_data 543{ 544 /* Target system. */ 545 enum elf_x86_target_os target_os; 546}; 547 548#define get_elf_x86_backend_data(abfd) \ 549 ((const struct elf_x86_backend_data *) \ 550 get_elf_backend_data (abfd)->arch_data) 551 552struct elf_x86_init_table 553{ 554 /* The lazy PLT layout. */ 555 const struct elf_x86_lazy_plt_layout *lazy_plt; 556 557 /* The non-lazy PLT layout. */ 558 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 559 560 /* The lazy PLT layout for IBT. */ 561 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; 562 563 /* The non-lazy PLT layout for IBT. */ 564 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; 565 566 bfd_byte plt0_pad_byte; 567 568 bfd_vma (*r_info) (bfd_vma, bfd_vma); 569 bfd_vma (*r_sym) (bfd_vma); 570}; 571 572struct elf_x86_obj_tdata 573{ 574 struct elf_obj_tdata root; 575 576 /* tls_type for each local got entry. */ 577 char *local_got_tls_type; 578 579 /* GOTPLT entries for TLS descriptors. */ 580 bfd_vma *local_tlsdesc_gotent; 581}; 582 583enum elf_x86_plt_type 584{ 585 plt_non_lazy = 0, 586 plt_lazy = 1 << 0, 587 plt_pic = 1 << 1, 588 plt_second = 1 << 2, 589 plt_unknown = -1 590}; 591 592struct elf_x86_plt 593{ 594 const char *name; 595 asection *sec; 596 bfd_byte *contents; 597 enum elf_x86_plt_type type; 598 unsigned int plt_got_offset; 599 unsigned int plt_entry_size; 600 unsigned int plt_got_insn_size; /* Only used for x86-64. */ 601 long count; 602}; 603 604#define elf_x86_tdata(abfd) \ 605 ((struct elf_x86_obj_tdata *) (abfd)->tdata.any) 606 607#define elf_x86_local_got_tls_type(abfd) \ 608 (elf_x86_tdata (abfd)->local_got_tls_type) 609 610#define elf_x86_local_tlsdesc_gotent(abfd) \ 611 (elf_x86_tdata (abfd)->local_tlsdesc_gotent) 612 613#define elf_x86_compute_jump_table_size(htab) \ 614 ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size) 615 616#define is_x86_elf(bfd, htab) \ 617 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 618 && elf_tdata (bfd) != NULL \ 619 && elf_object_id (bfd) == (htab)->target_id) 620 621extern bfd_boolean _bfd_x86_elf_mkobject 622 (bfd *); 623 624extern void _bfd_x86_elf_set_tls_module_base 625 (struct bfd_link_info *); 626 627extern bfd_vma _bfd_x86_elf_dtpoff_base 628 (struct bfd_link_info *); 629 630extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs 631 (struct elf_link_hash_entry *, void *); 632 633extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash 634 (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *, 635 bfd_boolean); 636 637extern hashval_t _bfd_x86_elf_local_htab_hash 638 (const void *); 639 640extern int _bfd_x86_elf_local_htab_eq 641 (const void *, const void *); 642 643extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc 644 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 645 646extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create 647 (bfd *); 648 649extern int _bfd_x86_elf_compare_relocs 650 (const void *, const void *); 651 652extern bfd_boolean _bfd_x86_elf_link_check_relocs 653 (bfd *, struct bfd_link_info *); 654 655extern bfd_boolean _bfd_x86_elf_size_dynamic_sections 656 (bfd *, struct bfd_link_info *); 657 658extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections 659 (bfd *, struct bfd_link_info *); 660 661extern bfd_boolean _bfd_x86_elf_always_size_sections 662 (bfd *, struct bfd_link_info *); 663 664extern void _bfd_x86_elf_merge_symbol_attribute 665 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, 666 bfd_boolean, bfd_boolean); 667 668extern void _bfd_x86_elf_copy_indirect_symbol 669 (struct bfd_link_info *, struct elf_link_hash_entry *, 670 struct elf_link_hash_entry *); 671 672extern bfd_boolean _bfd_x86_elf_fixup_symbol 673 (struct bfd_link_info *, struct elf_link_hash_entry *); 674 675extern bfd_boolean _bfd_x86_elf_hash_symbol 676 (struct elf_link_hash_entry *); 677 678extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol 679 (struct bfd_link_info *, struct elf_link_hash_entry *); 680 681extern void _bfd_x86_elf_hide_symbol 682 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 683 684extern bfd_boolean _bfd_x86_elf_link_symbol_references_local 685 (struct bfd_link_info *, struct elf_link_hash_entry *); 686 687extern asection * _bfd_x86_elf_gc_mark_hook 688 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 689 struct elf_link_hash_entry *, Elf_Internal_Sym *); 690 691extern long _bfd_x86_elf_get_synthetic_symtab 692 (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **, 693 asymbol **); 694 695extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties 696 (bfd *, unsigned int, bfd_byte *, unsigned int); 697 698extern bfd_boolean _bfd_x86_elf_merge_gnu_properties 699 (struct bfd_link_info *, bfd *, bfd *, elf_property *, elf_property *); 700 701extern void _bfd_x86_elf_link_fixup_gnu_properties 702 (struct bfd_link_info *, elf_property_list **); 703 704extern bfd * _bfd_x86_elf_link_setup_gnu_properties 705 (struct bfd_link_info *, struct elf_x86_init_table *); 706 707extern void _bfd_x86_elf_link_fixup_ifunc_symbol 708 (struct bfd_link_info *, struct elf_x86_link_hash_table *, 709 struct elf_link_hash_entry *, Elf_Internal_Sym *sym); 710 711#define bfd_elf64_mkobject \ 712 _bfd_x86_elf_mkobject 713#define bfd_elf32_mkobject \ 714 _bfd_x86_elf_mkobject 715#define bfd_elf64_bfd_link_hash_table_create \ 716 _bfd_x86_elf_link_hash_table_create 717#define bfd_elf32_bfd_link_hash_table_create \ 718 _bfd_x86_elf_link_hash_table_create 719#define bfd_elf64_bfd_link_check_relocs \ 720 _bfd_x86_elf_link_check_relocs 721#define bfd_elf32_bfd_link_check_relocs \ 722 _bfd_x86_elf_link_check_relocs 723 724#define elf_backend_size_dynamic_sections \ 725 _bfd_x86_elf_size_dynamic_sections 726#define elf_backend_always_size_sections \ 727 _bfd_x86_elf_always_size_sections 728#define elf_backend_merge_symbol_attribute \ 729 _bfd_x86_elf_merge_symbol_attribute 730#define elf_backend_copy_indirect_symbol \ 731 _bfd_x86_elf_copy_indirect_symbol 732#define elf_backend_fixup_symbol \ 733 _bfd_x86_elf_fixup_symbol 734#define elf_backend_hash_symbol \ 735 _bfd_x86_elf_hash_symbol 736#define elf_backend_adjust_dynamic_symbol \ 737 _bfd_x86_elf_adjust_dynamic_symbol 738#define elf_backend_gc_mark_hook \ 739 _bfd_x86_elf_gc_mark_hook 740#define elf_backend_omit_section_dynsym \ 741 _bfd_elf_omit_section_dynsym_all 742#define elf_backend_parse_gnu_properties \ 743 _bfd_x86_elf_parse_gnu_properties 744#define elf_backend_merge_gnu_properties \ 745 _bfd_x86_elf_merge_gnu_properties 746#define elf_backend_fixup_gnu_properties \ 747 _bfd_x86_elf_link_fixup_gnu_properties 748