bfd/elfxx-x86.h

   1 /* x86 specific support for ELF
   2    Copyright (C) 2017 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 "bfd_stdint.h"
  27 #include "hashtab.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 /* Is a undefined weak symbol which is resolved to 0.  Reference to an
  53    undefined weak symbol is resolved to 0 when building executable if
  54    it isn't dynamic and
  55    1. Has non-GOT/non-PLT relocations in text section.  Or
  56    2. Has no GOT/PLT relocation.
  57    Local undefined weak symbol is always resolved to 0.
  58  */
  59 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
  60   ((EH)->elf.root.type == bfd_link_hash_undefweak                \
  61    && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf)            \
  62        || (bfd_link_executable (INFO)                            \
  63            && (!(EH)->has_got_reloc                              \
  64                || (EH)->has_non_got_reloc))))
  65
  66 /* Should copy relocation be generated for a symbol.  Don't generate
  67    copy relocation against a protected symbol defined in a shared
  68    object with GNU_PROPERTY_NO_COPY_ON_PROTECTED.  */
  69 #define SYMBOL_NO_COPYRELOC(INFO, EH) \
  70   ((EH)->def_protected \
  71    && ((EH)->elf.root.type == bfd_link_hash_defined \
  72        || (EH)->elf.root.type == bfd_link_hash_defweak) \
  73    && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
  74    && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
  75    && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
  76
  77 /* TRUE if dynamic relocation is needed.  If we are creating a shared
  78    library, and this is a reloc against a global symbol, or a non PC
  79    relative reloc against a local symbol, then we need to copy the reloc
  80    into the shared library.  However, if we are linking with -Bsymbolic,
  81    we do not need to copy a reloc against a global symbol which is
  82    defined in an object we are including in the link (i.e., DEF_REGULAR
  83    is set).  At this point we have not seen all the input files, so it
  84    is possible that DEF_REGULAR is not set now but will be set later (it
  85    is never cleared).  In case of a weak definition, DEF_REGULAR may be
  86    cleared later by a strong definition in a shared library.  We account
  87    for that possibility below by storing information in the relocs_copied
  88    field of the hash table entry.  A similar situation occurs when
  89    creating shared libraries and symbol visibility changes render the
  90    symbol local.
  91
  92    If on the other hand, we are creating an executable, we may need to
  93    keep relocations for symbols satisfied by a dynamic library if we
  94    manage to avoid copy relocs for the symbol.
  95
  96    We also need to generate dynamic pointer relocation against
  97    STT_GNU_IFUNC symbol in the non-code section.  */
  98 #define NEED_DYNAMIC_RELOCATION_P(INFO, H, SEC, R_TYPE, POINTER_TYPE) \
  99   ((bfd_link_pic (INFO) \
 100     && (! X86_PCREL_TYPE_P (R_TYPE) \
 101         || ((H) != NULL \
 102             && (! (bfd_link_pie (INFO) \
 103                    || SYMBOLIC_BIND ((INFO), (H))) \
 104                 || (H)->root.type == bfd_link_hash_defweak \
 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)->func_pointer_refcount > 0 \
 141            || ((EH)->elf.root.type == bfd_link_hash_undefweak \
 142                && !(RESOLVED_TO_ZERO))) \
 143                && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \
 144                    || (EH)->elf.root.type == bfd_link_hash_undefined)))
 145
 146 /* TRUE if this input relocation should be copied to output.  H->dynindx
 147    may be -1 if this symbol was marked to become local.  */
 148 #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \
 149   ((H) != NULL \
 150    && (H)->dynindx != -1 \
 151    && (X86_PCREL_TYPE_P (R_TYPE) \
 152        || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
 153        || !(H)->def_regular))
 154
 155 /* TRUE if this is actually a static link, or it is a -Bsymbolic link
 156    and the symbol is defined locally, or the symbol was forced to be
 157    local because of a version file.  */
 158 #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \
 159   (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \
 160                                      bfd_link_pic (INFO), (H)) \
 161    || (bfd_link_pic (INFO) \
 162        && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \
 163        || (ELF_ST_VISIBILITY ((H)->other) \
 164            && (H)->root.type == bfd_link_hash_undefweak))
 165
 166 /* TRUE if relative relocation should be generated.  GOT reference to
 167    global symbol in PIC will lead to dynamic symbol.  It becomes a
 168    problem when "time" or "times" is defined as a variable in an
 169    executable, clashing with functions of the same name in libc.  If a
 170    symbol isn't undefined weak symbol, don't make it dynamic in PIC and
 171    generate relative relocation.  */
 172 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \
 173   ((H)->dynindx == -1 \
 174    && !(H)->forced_local \
 175    && (H)->root.type != bfd_link_hash_undefweak \
 176    && bfd_link_pic (INFO))
 177
 178 /* TRUE if this is a pointer reference to a local IFUNC.  */
 179 #define POINTER_LOCAL_IFUNC_P(INFO, H) \
 180   ((H)->dynindx == -1 \
 181    || (H)->forced_local \
 182    || bfd_link_executable (INFO))
 183
 184 /* TRUE if this is a PLT reference to a local IFUNC.  */
 185 #define PLT_LOCAL_IFUNC_P(INFO, H) \
 186   ((H)->dynindx == -1 \
 187    || ((bfd_link_executable (INFO) \
 188         || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
 189         && (H)->def_regular \
 190         && (H)->type == STT_GNU_IFUNC))
 191
 192 /* TRUE if TLS IE->LE transition is OK.  */
 193 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
 194   (bfd_link_executable (INFO) \
 195    && (H) != NULL \
 196    && (H)->dynindx == -1 \
 197    && (TLS_TYPE & GOT_TLS_IE))
 198
 199 /* Verify that the symbol has an entry in the procedure linkage table.  */
 200 #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \
 201   if (((H)->dynindx == -1 \
 202        && !LOCAL_UNDEFWEAK \
 203        && !(((H)->forced_local || bfd_link_executable (INFO)) \
 204             && (H)->def_regular \
 205             && (H)->type == STT_GNU_IFUNC)) \
 206       || (PLT) == NULL \
 207       || (GOTPLT) == NULL \
 208       || (RELPLT) == NULL) \
 209     abort ();
 210
 211 /* x86 ELF linker hash entry.  */
 212
 213 struct elf_x86_link_hash_entry
 214 {
 215   struct elf_link_hash_entry elf;
 216
 217   /* Track dynamic relocs copied for this symbol.  */
 218   struct elf_dyn_relocs *dyn_relocs;
 219
 220   unsigned char tls_type;
 221
 222   /* TRUE if symbol has GOT or PLT relocations.  */
 223   unsigned int has_got_reloc : 1;
 224
 225   /* TRUE if symbol has non-GOT/non-PLT relocations in text sections.  */
 226   unsigned int has_non_got_reloc : 1;
 227
 228   /* Don't call finish_dynamic_symbol on this symbol.  */
 229   unsigned int no_finish_dynamic_symbol : 1;
 230
 231   /* TRUE if symbol is __tls_get_addr.  */
 232   unsigned int tls_get_addr : 1;
 233
 234   /* TRUE if symbol is defined as a protected symbol.  */
 235   unsigned int def_protected : 1;
 236
 237   /* 0: Symbol references are unknown.
 238      1: Symbol references aren't local.
 239      2: Symbol references are local.
 240    */
 241   unsigned int local_ref : 2;
 242
 243   /* TRUE if symbol is defined by linker.  */
 244   unsigned int linker_def : 1;
 245
 246   /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
 247      only used by i386.  */
 248   unsigned int gotoff_ref : 1;
 249
 250   /* TRUE if a weak symbol with a real definition needs a copy reloc.
 251      When there is a weak symbol with a real definition, the processor
 252      independent code will have arranged for us to see the real
 253      definition first.  We need to copy the needs_copy bit from the
 254      real definition and check it when allowing copy reloc in PIE.  This
 255      is only used by x86-64.  */
 256   unsigned int needs_copy : 1;
 257
 258   /* Reference count of C/C++ function pointer relocations in read-write
 259      section which can be resolved at run-time.  */
 260   bfd_signed_vma func_pointer_refcount;
 261
 262   /* Information about the GOT PLT entry. Filled when there are both
 263      GOT and PLT relocations against the same function.  */
 264   union gotplt_union plt_got;
 265
 266   /* Information about the second PLT entry.   */
 267   union gotplt_union plt_second;
 268
 269   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 270      starting at the end of the jump table.  */
 271   bfd_vma tlsdesc_got;
 272 };
 273
 274 struct elf_x86_lazy_plt_layout
 275 {
 276   /* The first entry in an absolute lazy procedure linkage table looks
 277      like this.  */
 278   const bfd_byte *plt0_entry;
 279   unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */
 280
 281   /* Later entries in an absolute lazy procedure linkage table look
 282      like this.  */
 283   const bfd_byte *plt_entry;
 284   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 285
 286   /* Offsets into plt0_entry that are to be replaced with GOT[1] and
 287      GOT[2].  */
 288   unsigned int plt0_got1_offset;
 289   unsigned int plt0_got2_offset;
 290
 291   /* Offset of the end of the PC-relative instruction containing
 292      plt0_got2_offset.  This is for x86-64 only.  */
 293   unsigned int plt0_got2_insn_end;
 294
 295   /* Offsets into plt_entry that are to be replaced with...  */
 296   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 297   unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
 298   unsigned int plt_plt_offset;    /* ... offset to start of .plt. */
 299
 300   /* Length of the PC-relative instruction containing plt_got_offset.
 301      This is used for x86-64 only.  */
 302   unsigned int plt_got_insn_size;
 303
 304   /* Offset of the end of the PC-relative jump to plt0_entry.  This is
 305      used for x86-64 only.  */
 306   unsigned int plt_plt_insn_end;
 307
 308   /* Offset into plt_entry where the initial value of the GOT entry
 309      points.  */
 310   unsigned int plt_lazy_offset;
 311
 312   /* The first entry in a PIC lazy procedure linkage table looks like
 313      this.  */
 314   const bfd_byte *pic_plt0_entry;
 315
 316   /* Subsequent entries in a PIC lazy procedure linkage table look
 317      like this.  */
 318   const bfd_byte *pic_plt_entry;
 319
 320   /* .eh_frame covering the lazy .plt section.  */
 321   const bfd_byte *eh_frame_plt;
 322   unsigned int eh_frame_plt_size;
 323 };
 324
 325 struct elf_x86_non_lazy_plt_layout
 326 {
 327   /* Entries in an absolute non-lazy procedure linkage table look like
 328      this.  */
 329   const bfd_byte *plt_entry;
 330   /* Entries in a PIC non-lazy procedure linkage table look like this.  */
 331   const bfd_byte *pic_plt_entry;
 332
 333   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 334
 335   /* Offsets into plt_entry that are to be replaced with...  */
 336   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 337
 338   /* Length of the PC-relative instruction containing plt_got_offset.
 339      This is used for x86-64 only.  */
 340   unsigned int plt_got_insn_size;
 341
 342   /* .eh_frame covering the non-lazy .plt section.  */
 343   const bfd_byte *eh_frame_plt;
 344   unsigned int eh_frame_plt_size;
 345 };
 346
 347 struct elf_x86_plt_layout
 348 {
 349   /* The first entry in a lazy procedure linkage table looks like this.
 350      This is only used for i386 where absolute PLT0 and PIC PLT0 are
 351      different.  */
 352   const bfd_byte *plt0_entry;
 353   /* Entries in a procedure linkage table look like this.  */
 354   const bfd_byte *plt_entry;
 355   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 356
 357   /* 1 has PLT0.  */
 358   unsigned int has_plt0;
 359
 360   /* Offsets into plt_entry that are to be replaced with...  */
 361   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 362
 363   /* Length of the PC-relative instruction containing plt_got_offset.
 364      This is only used for x86-64.  */
 365   unsigned int plt_got_insn_size;
 366
 367   /* .eh_frame covering the .plt section.  */
 368   const bfd_byte *eh_frame_plt;
 369   unsigned int eh_frame_plt_size;
 370 };
 371
 372 /* Values in tls_type of x86 ELF linker hash entry.  */
 373 #define GOT_UNKNOWN     0
 374 #define GOT_NORMAL      1
 375 #define GOT_TLS_GD      2
 376 #define GOT_TLS_IE      4
 377 #define GOT_TLS_IE_POS  5
 378 #define GOT_TLS_IE_NEG  6
 379 #define GOT_TLS_IE_BOTH 7
 380 #define GOT_TLS_GDESC   8
 381 #define GOT_TLS_GD_BOTH_P(type) \
 382   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 383 #define GOT_TLS_GD_P(type) \
 384   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 385 #define GOT_TLS_GDESC_P(type) \
 386   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 387 #define GOT_TLS_GD_ANY_P(type) \
 388   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 389
 390 #define elf_x86_hash_entry(ent) \
 391   ((struct elf_x86_link_hash_entry *)(ent))
 392
 393 /* x86 ELF linker hash table.  */
 394
 395 struct elf_x86_link_hash_table
 396 {
 397   struct elf_link_hash_table elf;
 398
 399   /* Short-cuts to get to dynamic linker sections.  */
 400   asection *interp;
 401   asection *plt_eh_frame;
 402   asection *plt_second;
 403   asection *plt_second_eh_frame;
 404   asection *plt_got;
 405   asection *plt_got_eh_frame;
 406
 407   /* Parameters describing PLT generation, lazy or non-lazy.  */
 408   struct elf_x86_plt_layout plt;
 409
 410   /* Parameters describing lazy PLT generation.  */
 411   const struct elf_x86_lazy_plt_layout *lazy_plt;
 412
 413   /* Parameters describing non-lazy PLT generation.  */
 414   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 415
 416   union
 417   {
 418     bfd_signed_vma refcount;
 419     bfd_vma offset;
 420   } tls_ld_or_ldm_got;
 421
 422   /* The amount of space used by the jump slots in the GOT.  */
 423   bfd_vma sgotplt_jump_table_size;
 424
 425   /* Small local sym cache.  */
 426   struct sym_cache sym_cache;
 427
 428   /* _TLS_MODULE_BASE_ symbol.  */
 429   struct bfd_link_hash_entry *tls_module_base;
 430
 431   /* Used by local STT_GNU_IFUNC symbols.  */
 432   htab_t loc_hash_table;
 433   void * loc_hash_memory;
 434
 435   /* The offset into sgot of the GOT entry used by the PLT entry
 436      above.  */
 437   bfd_vma tlsdesc_got;
 438
 439   /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
 440   bfd_vma next_jump_slot_index;
 441   /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
 442   bfd_vma next_irelative_index;
 443
 444   /* TRUE if there are dynamic relocs against IFUNC symbols that apply
 445      to read-only sections.  */
 446   bfd_boolean readonly_dynrelocs_against_ifunc;
 447
 448   /* TRUE if this is a VxWorks x86 target.  This is only used for
 449      i386.  */
 450   bfd_boolean is_vxworks;
 451
 452   /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
 453      This is used for i386 only.  */
 454   asection *srelplt2;
 455
 456   /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
 457      is only used for i386.  */
 458   bfd_vma next_tls_desc_index;
 459
 460   /* The offset into splt of the PLT entry for the TLS descriptor
 461      resolver.  Special values are 0, if not necessary (or not found
 462      to be necessary yet), and -1 if needed but not determined
 463      yet.  This is only used for x86-64.  */
 464   bfd_vma tlsdesc_plt;
 465
 466   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 467   bfd_vma (*r_sym) (bfd_vma);
 468   bfd_boolean (*is_reloc_section) (const char *);
 469   enum elf_target_id target_id;
 470   unsigned int sizeof_reloc;
 471   unsigned int dt_reloc;
 472   unsigned int dt_reloc_sz;
 473   unsigned int dt_reloc_ent;
 474   unsigned int got_entry_size;
 475   unsigned int pointer_r_type;
 476   int dynamic_interpreter_size;
 477   const char *dynamic_interpreter;
 478   const char *tls_get_addr;
 479 };
 480
 481 struct elf_x86_init_table
 482 {
 483   /* The lazy PLT layout.  */
 484   const struct elf_x86_lazy_plt_layout *lazy_plt;
 485
 486   /* The non-lazy PLT layout.  */
 487   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 488
 489   /* The lazy PLT layout for IBT.  */
 490   const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
 491
 492   /* The non-lazy PLT layout for IBT.  */
 493   const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
 494
 495   /* TRUE if this is a normal x86 target.  */
 496   bfd_boolean normal_target;
 497
 498   /* TRUE if this is a VxWorks x86 target.  */
 499   bfd_boolean is_vxworks;
 500
 501   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 502   bfd_vma (*r_sym) (bfd_vma);
 503 };
 504
 505 struct elf_x86_obj_tdata
 506 {
 507   struct elf_obj_tdata root;
 508
 509   /* tls_type for each local got entry.  */
 510   char *local_got_tls_type;
 511
 512   /* GOTPLT entries for TLS descriptors.  */
 513   bfd_vma *local_tlsdesc_gotent;
 514 };
 515
 516 enum elf_x86_plt_type
 517 {
 518   plt_non_lazy = 0,
 519   plt_lazy = 1 << 0,
 520   plt_pic = 1 << 1,
 521   plt_second = 1 << 2,
 522   plt_unknown = -1
 523 };
 524
 525 struct elf_x86_plt
 526 {
 527   const char *name;
 528   asection *sec;
 529   bfd_byte *contents;
 530   enum elf_x86_plt_type type;
 531   unsigned int plt_got_offset;
 532   unsigned int plt_entry_size;
 533   unsigned int plt_got_insn_size;       /* Only used for x86-64.  */
 534   long count;
 535 };
 536
 537 #define elf_x86_tdata(abfd) \
 538   ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
 539
 540 #define elf_x86_local_got_tls_type(abfd) \
 541   (elf_x86_tdata (abfd)->local_got_tls_type)
 542
 543 #define elf_x86_local_tlsdesc_gotent(abfd) \
 544   (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
 545
 546 #define elf_x86_compute_jump_table_size(htab) \
 547   ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
 548
 549 #define is_x86_elf(bfd, htab)                           \
 550   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 551    && elf_tdata (bfd) != NULL                           \
 552    && elf_object_id (bfd) == (htab)->target_id)
 553
 554 extern bfd_boolean _bfd_x86_elf_mkobject
 555   (bfd *);
 556
 557 extern void _bfd_x86_elf_set_tls_module_base
 558   (struct bfd_link_info *);
 559
 560 extern bfd_vma _bfd_x86_elf_dtpoff_base
 561   (struct bfd_link_info *);
 562
 563 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
 564   (struct elf_link_hash_entry *, void *);
 565
 566 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
 567   (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
 568    bfd_boolean);
 569
 570 extern hashval_t _bfd_x86_elf_local_htab_hash
 571   (const void *);
 572
 573 extern int _bfd_x86_elf_local_htab_eq
 574   (const void *, const void *);
 575
 576 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
 577   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 578
 579 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
 580   (bfd *);
 581
 582 extern int _bfd_x86_elf_compare_relocs
 583   (const void *, const void *);
 584
 585 extern bfd_boolean _bfd_x86_elf_link_check_relocs
 586   (bfd *, struct bfd_link_info *);
 587
 588 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
 589   (bfd *, struct bfd_link_info *);
 590
 591 extern bfd_boolean _bfd_x86_elf_always_size_sections
 592   (bfd *, struct bfd_link_info *);
 593
 594 extern void _bfd_x86_elf_merge_symbol_attribute
 595   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 596    bfd_boolean, bfd_boolean);
 597
 598 extern void _bfd_x86_elf_copy_indirect_symbol
 599   (struct bfd_link_info *, struct elf_link_hash_entry *,
 600    struct elf_link_hash_entry *);
 601
 602 extern bfd_boolean _bfd_x86_elf_fixup_symbol
 603   (struct bfd_link_info *, struct elf_link_hash_entry *);
 604
 605 extern bfd_boolean _bfd_x86_elf_hash_symbol
 606   (struct elf_link_hash_entry *);
 607
 608 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
 609   (struct bfd_link_info *, struct elf_link_hash_entry *);
 610
 611 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
 612   (struct bfd_link_info *, struct elf_link_hash_entry *);
 613
 614 extern asection * _bfd_x86_elf_gc_mark_hook
 615   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
 616    struct elf_link_hash_entry *, Elf_Internal_Sym *);
 617
 618 extern long _bfd_x86_elf_get_synthetic_symtab
 619   (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
 620    asymbol **);
 621
 622 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
 623   (bfd *, unsigned int, bfd_byte *, unsigned int);
 624
 625 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
 626   (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
 627
 628 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
 629   (struct bfd_link_info *, struct elf_x86_init_table *);
 630
 631 #define bfd_elf64_mkobject \
 632   _bfd_x86_elf_mkobject
 633 #define bfd_elf32_mkobject \
 634   _bfd_x86_elf_mkobject
 635 #define bfd_elf64_bfd_link_hash_table_create \
 636   _bfd_x86_elf_link_hash_table_create
 637 #define bfd_elf32_bfd_link_hash_table_create \
 638   _bfd_x86_elf_link_hash_table_create
 639 #define bfd_elf64_bfd_link_check_relocs \
 640   _bfd_x86_elf_link_check_relocs
 641 #define bfd_elf32_bfd_link_check_relocs \
 642   _bfd_x86_elf_link_check_relocs
 643
 644 #define elf_backend_size_dynamic_sections \
 645   _bfd_x86_elf_size_dynamic_sections
 646 #define elf_backend_always_size_sections \
 647   _bfd_x86_elf_always_size_sections
 648 #define elf_backend_merge_symbol_attribute \
 649   _bfd_x86_elf_merge_symbol_attribute
 650 #define elf_backend_copy_indirect_symbol \
 651   _bfd_x86_elf_copy_indirect_symbol
 652 #define elf_backend_fixup_symbol \
 653   _bfd_x86_elf_fixup_symbol
 654 #define elf_backend_hash_symbol \
 655   _bfd_x86_elf_hash_symbol
 656 #define elf_backend_adjust_dynamic_symbol \
 657   _bfd_x86_elf_adjust_dynamic_symbol
 658 #define elf_backend_gc_mark_hook \
 659   _bfd_x86_elf_gc_mark_hook
 660 #define elf_backend_omit_section_dynsym \
 661   ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
 662 #define elf_backend_parse_gnu_properties \
 663   _bfd_x86_elf_parse_gnu_properties
 664 #define elf_backend_merge_gnu_properties \
 665   _bfd_x86_elf_merge_gnu_properties