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 /* 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).  At this point we have not seen all the input files, so it
  80    is possible that DEF_REGULAR is not set now but will be set later (it
  81    is never cleared).  In case of a weak definition, DEF_REGULAR may be
  82    cleared later by a strong definition in a shared library.  We account
  83    for that possibility below by storing information in the relocs_copied
  84    field of the hash table entry.  A similar situation occurs when
  85    creating shared libraries and symbol visibility changes render the
  86    symbol local.
  87
  88    If on the other hand, we are creating an executable, we may need to
  89    keep relocations for symbols satisfied by a dynamic library if we
  90    manage to avoid copy relocs for the symbol.
  91
  92    We also need to generate dynamic pointer relocation against
  93    STT_GNU_IFUNC symbol in the non-code section.  */
  94 #define NEED_DYNAMIC_RELOCATION_P(INFO, H, SEC, R_TYPE, POINTER_TYPE) \
  95   ((bfd_link_pic (INFO) \
  96     && (! X86_PCREL_TYPE_P (R_TYPE) \
  97         || ((H) != NULL \
  98             && (! (bfd_link_pie (INFO) \
  99                    || SYMBOLIC_BIND ((INFO), (H))) \
 100                 || (H)->root.type == bfd_link_hash_defweak \
 101                 || !(H)->def_regular)))) \
 102                 || ((H) != NULL \
 103                     && (H)->type == STT_GNU_IFUNC \
 104                     && (R_TYPE) == POINTER_TYPE \
 105                     && ((SEC)->flags & SEC_CODE) == 0) \
 106                     || (ELIMINATE_COPY_RELOCS \
 107                         && !bfd_link_pic (INFO) \
 108                         && (H) != NULL \
 109                         && ((H)->root.type == bfd_link_hash_defweak \
 110                             || !(H)->def_regular)))
 111
 112 /* TRUE if dynamic relocation should be generated.  Don't copy a
 113    pc-relative relocation into the output file if the symbol needs
 114    copy reloc or the symbol is undefined when building executable.
 115    Copy dynamic function pointer relocations.  Don't generate dynamic
 116    relocations against resolved undefined weak symbols in PIE, except
 117    when PC32_RELOC is TRUE.  Undefined weak symbol is bound locally
 118    when PIC is false.  */
 119 #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \
 120                                       NEED_COPY_RELOC_IN_PIE, \
 121                                       RESOLVED_TO_ZERO, PC32_RELOC) \
 122   ((bfd_link_pic (INFO) \
 123     && !(NEED_COPY_RELOC_IN_PIE) \
 124     && ((EH) == NULL \
 125         || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \
 126              && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \
 127             || (EH)->elf.root.type != bfd_link_hash_undefweak)) \
 128     && ((!X86_PCREL_TYPE_P (R_TYPE) \
 129          && !X86_SIZE_TYPE_P (R_TYPE)) \
 130          || ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \
 131    || (ELIMINATE_COPY_RELOCS \
 132        && !bfd_link_pic (INFO) \
 133        && (EH) != NULL \
 134        && (EH)->elf.dynindx != -1 \
 135        && (!(EH)->elf.non_got_ref \
 136            || ((EH)->elf.root.type == bfd_link_hash_undefweak \
 137                && !(RESOLVED_TO_ZERO))) \
 138                && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \
 139                    || (EH)->elf.root.type == bfd_link_hash_undefined)))
 140
 141 /* TRUE if this input relocation should be copied to output.  H->dynindx
 142    may be -1 if this symbol was marked to become local.  */
 143 #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \
 144   ((H) != NULL \
 145    && (H)->dynindx != -1 \
 146    && (X86_PCREL_TYPE_P (R_TYPE) \
 147        || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
 148        || !(H)->def_regular))
 149
 150 /* TRUE if this is actually a static link, or it is a -Bsymbolic link
 151    and the symbol is defined locally, or the symbol was forced to be
 152    local because of a version file.  */
 153 #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \
 154   (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \
 155                                      bfd_link_pic (INFO), (H)) \
 156    || (bfd_link_pic (INFO) \
 157        && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \
 158        || (ELF_ST_VISIBILITY ((H)->other) \
 159            && (H)->root.type == bfd_link_hash_undefweak))
 160
 161 /* TRUE if relative relocation should be generated.  GOT reference to
 162    global symbol in PIC will lead to dynamic symbol.  It becomes a
 163    problem when "time" or "times" is defined as a variable in an
 164    executable, clashing with functions of the same name in libc.  If a
 165    symbol isn't undefined weak symbol, don't make it dynamic in PIC and
 166    generate relative relocation.  */
 167 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \
 168   ((H)->dynindx == -1 \
 169    && !(H)->forced_local \
 170    && (H)->root.type != bfd_link_hash_undefweak \
 171    && bfd_link_pic (INFO))
 172
 173 /* TRUE if this is a pointer reference to a local IFUNC.  */
 174 #define POINTER_LOCAL_IFUNC_P(INFO, H) \
 175   ((H)->dynindx == -1 \
 176    || (H)->forced_local \
 177    || bfd_link_executable (INFO))
 178
 179 /* TRUE if this is a PLT reference to a local IFUNC.  */
 180 #define PLT_LOCAL_IFUNC_P(INFO, H) \
 181   ((H)->dynindx == -1 \
 182    || ((bfd_link_executable (INFO) \
 183         || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
 184         && (H)->def_regular \
 185         && (H)->type == STT_GNU_IFUNC))
 186
 187 /* TRUE if TLS IE->LE transition is OK.  */
 188 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
 189   (bfd_link_executable (INFO) \
 190    && (H) != NULL \
 191    && (H)->dynindx == -1 \
 192    && (TLS_TYPE & GOT_TLS_IE))
 193
 194 /* Verify that the symbol has an entry in the procedure linkage table.  */
 195 #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \
 196   do \
 197     { \
 198       if (((H)->dynindx == -1 \
 199            && !LOCAL_UNDEFWEAK \
 200            && !(((H)->forced_local || bfd_link_executable (INFO)) \
 201                 && (H)->def_regular \
 202                 && (H)->type == STT_GNU_IFUNC)) \
 203           || (PLT) == NULL \
 204           || (GOTPLT) == NULL \
 205           || (RELPLT) == NULL) \
 206         abort (); \
 207     } \
 208   while (0);
 209
 210 /* Verify that the symbol supports copy relocation.  */
 211 #define VERIFY_COPY_RELOC(H, HTAB) \
 212   do \
 213     { \
 214       if ((H)->dynindx == -1 \
 215           || ((H)->root.type != bfd_link_hash_defined \
 216               && (H)->root.type != bfd_link_hash_defweak) \
 217           || (HTAB)->elf.srelbss == NULL \
 218           || (HTAB)->elf.sreldynrelro == NULL) \
 219         abort (); \
 220     } \
 221   while (0);
 222
 223 /* x86 ELF linker hash entry.  */
 224
 225 struct elf_x86_link_hash_entry
 226 {
 227   struct elf_link_hash_entry elf;
 228
 229   /* Track dynamic relocs copied for this symbol.  */
 230   struct elf_dyn_relocs *dyn_relocs;
 231
 232   unsigned char tls_type;
 233
 234   /* Bit 0: Symbol has no GOT nor PLT relocations.
 235      Bit 1: Symbol has non-GOT/non-PLT relocations in text sections.
 236      zero_undefweak is initialized to 1 and undefined weak symbol
 237      should be resolved to 0 if zero_undefweak > 0.  */
 238   unsigned int zero_undefweak : 2;
 239
 240   /* Don't call finish_dynamic_symbol on this symbol.  */
 241   unsigned int no_finish_dynamic_symbol : 1;
 242
 243   /* TRUE if symbol is __tls_get_addr.  */
 244   unsigned int tls_get_addr : 1;
 245
 246   /* TRUE if symbol is defined as a protected symbol.  */
 247   unsigned int def_protected : 1;
 248
 249   /* 0: Symbol references are unknown.
 250      1: Symbol references aren't local.
 251      2: Symbol references are local.
 252    */
 253   unsigned int local_ref : 2;
 254
 255   /* TRUE if symbol is defined by linker.  */
 256   unsigned int linker_def : 1;
 257
 258   /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
 259      only used by i386.  */
 260   unsigned int gotoff_ref : 1;
 261
 262   /* TRUE if a weak symbol with a real definition needs a copy reloc.
 263      When there is a weak symbol with a real definition, the processor
 264      independent code will have arranged for us to see the real
 265      definition first.  We need to copy the needs_copy bit from the
 266      real definition and check it when allowing copy reloc in PIE.  This
 267      is only used by x86-64.  */
 268   unsigned int needs_copy : 1;
 269
 270   /* Information about the GOT PLT entry. Filled when there are both
 271      GOT and PLT relocations against the same function.  */
 272   union gotplt_union plt_got;
 273
 274   /* Information about the second PLT entry.   */
 275   union gotplt_union plt_second;
 276
 277   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 278      starting at the end of the jump table.  */
 279   bfd_vma tlsdesc_got;
 280 };
 281
 282 struct elf_x86_lazy_plt_layout
 283 {
 284   /* The first entry in an absolute lazy procedure linkage table looks
 285      like this.  */
 286   const bfd_byte *plt0_entry;
 287   unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */
 288
 289   /* Later entries in an absolute lazy procedure linkage table look
 290      like this.  */
 291   const bfd_byte *plt_entry;
 292   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 293
 294   /* Offsets into plt0_entry that are to be replaced with GOT[1] and
 295      GOT[2].  */
 296   unsigned int plt0_got1_offset;
 297   unsigned int plt0_got2_offset;
 298
 299   /* Offset of the end of the PC-relative instruction containing
 300      plt0_got2_offset.  This is for x86-64 only.  */
 301   unsigned int plt0_got2_insn_end;
 302
 303   /* Offsets into plt_entry that are to be replaced with...  */
 304   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 305   unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
 306   unsigned int plt_plt_offset;    /* ... offset to start of .plt. */
 307
 308   /* Length of the PC-relative instruction containing plt_got_offset.
 309      This is used for x86-64 only.  */
 310   unsigned int plt_got_insn_size;
 311
 312   /* Offset of the end of the PC-relative jump to plt0_entry.  This is
 313      used for x86-64 only.  */
 314   unsigned int plt_plt_insn_end;
 315
 316   /* Offset into plt_entry where the initial value of the GOT entry
 317      points.  */
 318   unsigned int plt_lazy_offset;
 319
 320   /* The first entry in a PIC lazy procedure linkage table looks like
 321      this.  */
 322   const bfd_byte *pic_plt0_entry;
 323
 324   /* Subsequent entries in a PIC lazy procedure linkage table look
 325      like this.  */
 326   const bfd_byte *pic_plt_entry;
 327
 328   /* .eh_frame covering the lazy .plt section.  */
 329   const bfd_byte *eh_frame_plt;
 330   unsigned int eh_frame_plt_size;
 331 };
 332
 333 struct elf_x86_non_lazy_plt_layout
 334 {
 335   /* Entries in an absolute non-lazy procedure linkage table look like
 336      this.  */
 337   const bfd_byte *plt_entry;
 338   /* Entries in a PIC non-lazy procedure linkage table look like this.  */
 339   const bfd_byte *pic_plt_entry;
 340
 341   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 342
 343   /* Offsets into plt_entry that are to be replaced with...  */
 344   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 345
 346   /* Length of the PC-relative instruction containing plt_got_offset.
 347      This is used for x86-64 only.  */
 348   unsigned int plt_got_insn_size;
 349
 350   /* .eh_frame covering the non-lazy .plt section.  */
 351   const bfd_byte *eh_frame_plt;
 352   unsigned int eh_frame_plt_size;
 353 };
 354
 355 struct elf_x86_plt_layout
 356 {
 357   /* The first entry in a lazy procedure linkage table looks like this.
 358      This is only used for i386 where absolute PLT0 and PIC PLT0 are
 359      different.  */
 360   const bfd_byte *plt0_entry;
 361   /* Entries in a procedure linkage table look like this.  */
 362   const bfd_byte *plt_entry;
 363   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 364
 365   /* 1 has PLT0.  */
 366   unsigned int has_plt0;
 367
 368   /* Offsets into plt_entry that are to be replaced with...  */
 369   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 370
 371   /* Length of the PC-relative instruction containing plt_got_offset.
 372      This is only used for x86-64.  */
 373   unsigned int plt_got_insn_size;
 374
 375   /* .eh_frame covering the .plt section.  */
 376   const bfd_byte *eh_frame_plt;
 377   unsigned int eh_frame_plt_size;
 378 };
 379
 380 /* Values in tls_type of x86 ELF linker hash entry.  */
 381 #define GOT_UNKNOWN     0
 382 #define GOT_NORMAL      1
 383 #define GOT_TLS_GD      2
 384 #define GOT_TLS_IE      4
 385 #define GOT_TLS_IE_POS  5
 386 #define GOT_TLS_IE_NEG  6
 387 #define GOT_TLS_IE_BOTH 7
 388 #define GOT_TLS_GDESC   8
 389 #define GOT_TLS_GD_BOTH_P(type) \
 390   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 391 #define GOT_TLS_GD_P(type) \
 392   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 393 #define GOT_TLS_GDESC_P(type) \
 394   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 395 #define GOT_TLS_GD_ANY_P(type) \
 396   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 397
 398 #define elf_x86_hash_entry(ent) \
 399   ((struct elf_x86_link_hash_entry *)(ent))
 400
 401 enum elf_x86_target_os
 402 {
 403   is_normal,
 404   is_vxworks,
 405   is_nacl
 406 };
 407
 408 /* x86 ELF linker hash table.  */
 409
 410 struct elf_x86_link_hash_table
 411 {
 412   struct elf_link_hash_table elf;
 413
 414   /* Short-cuts to get to dynamic linker sections.  */
 415   asection *interp;
 416   asection *plt_eh_frame;
 417   asection *plt_second;
 418   asection *plt_second_eh_frame;
 419   asection *plt_got;
 420   asection *plt_got_eh_frame;
 421
 422   /* Parameters describing PLT generation, lazy or non-lazy.  */
 423   struct elf_x86_plt_layout plt;
 424
 425   /* Parameters describing lazy PLT generation.  */
 426   const struct elf_x86_lazy_plt_layout *lazy_plt;
 427
 428   /* Parameters describing non-lazy PLT generation.  */
 429   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 430
 431   union
 432   {
 433     bfd_signed_vma refcount;
 434     bfd_vma offset;
 435   } tls_ld_or_ldm_got;
 436
 437   /* The amount of space used by the jump slots in the GOT.  */
 438   bfd_vma sgotplt_jump_table_size;
 439
 440   /* Small local sym cache.  */
 441   struct sym_cache sym_cache;
 442
 443   /* _TLS_MODULE_BASE_ symbol.  */
 444   struct bfd_link_hash_entry *tls_module_base;
 445
 446   /* Used by local STT_GNU_IFUNC symbols.  */
 447   htab_t loc_hash_table;
 448   void * loc_hash_memory;
 449
 450   /* The offset into sgot of the GOT entry used by the PLT entry
 451      above.  */
 452   bfd_vma tlsdesc_got;
 453
 454   /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
 455   bfd_vma next_jump_slot_index;
 456   /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
 457   bfd_vma next_irelative_index;
 458
 459   /* TRUE if there are dynamic relocs against IFUNC symbols that apply
 460      to read-only sections.  */
 461   bfd_boolean readonly_dynrelocs_against_ifunc;
 462
 463   /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
 464      This is used for i386 only.  */
 465   asection *srelplt2;
 466
 467   /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
 468      is only used for i386.  */
 469   bfd_vma next_tls_desc_index;
 470
 471   /* The offset into splt of the PLT entry for the TLS descriptor
 472      resolver.  Special values are 0, if not necessary (or not found
 473      to be necessary yet), and -1 if needed but not determined
 474      yet.  This is only used for x86-64.  */
 475   bfd_vma tlsdesc_plt;
 476
 477    /* Value used to fill the unused bytes of the first PLT entry.  This
 478       is only used for i386.  */
 479   bfd_byte plt0_pad_byte;
 480
 481   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 482   bfd_vma (*r_sym) (bfd_vma);
 483   bfd_boolean (*is_reloc_section) (const char *);
 484   enum elf_target_id target_id;
 485   enum elf_x86_target_os target_os;
 486   unsigned int sizeof_reloc;
 487   unsigned int dt_reloc;
 488   unsigned int dt_reloc_sz;
 489   unsigned int dt_reloc_ent;
 490   unsigned int got_entry_size;
 491   unsigned int pointer_r_type;
 492   int dynamic_interpreter_size;
 493   const char *dynamic_interpreter;
 494   const char *tls_get_addr;
 495 };
 496
 497 /* Architecture-specific backend data for x86.  */
 498
 499 struct elf_x86_backend_data
 500 {
 501   /* Target system.  */
 502   enum elf_x86_target_os target_os;
 503 };
 504
 505 #define get_elf_x86_backend_data(abfd) \
 506   ((const struct elf_x86_backend_data *) \
 507    get_elf_backend_data (abfd)->arch_data)
 508
 509 struct elf_x86_init_table
 510 {
 511   /* The lazy PLT layout.  */
 512   const struct elf_x86_lazy_plt_layout *lazy_plt;
 513
 514   /* The non-lazy PLT layout.  */
 515   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 516
 517   /* The lazy PLT layout for IBT.  */
 518   const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
 519
 520   /* The non-lazy PLT layout for IBT.  */
 521   const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
 522
 523   bfd_byte plt0_pad_byte;
 524
 525   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 526   bfd_vma (*r_sym) (bfd_vma);
 527 };
 528
 529 struct elf_x86_obj_tdata
 530 {
 531   struct elf_obj_tdata root;
 532
 533   /* tls_type for each local got entry.  */
 534   char *local_got_tls_type;
 535
 536   /* GOTPLT entries for TLS descriptors.  */
 537   bfd_vma *local_tlsdesc_gotent;
 538 };
 539
 540 enum elf_x86_plt_type
 541 {
 542   plt_non_lazy = 0,
 543   plt_lazy = 1 << 0,
 544   plt_pic = 1 << 1,
 545   plt_second = 1 << 2,
 546   plt_unknown = -1
 547 };
 548
 549 struct elf_x86_plt
 550 {
 551   const char *name;
 552   asection *sec;
 553   bfd_byte *contents;
 554   enum elf_x86_plt_type type;
 555   unsigned int plt_got_offset;
 556   unsigned int plt_entry_size;
 557   unsigned int plt_got_insn_size;       /* Only used for x86-64.  */
 558   long count;
 559 };
 560
 561 #define elf_x86_tdata(abfd) \
 562   ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
 563
 564 #define elf_x86_local_got_tls_type(abfd) \
 565   (elf_x86_tdata (abfd)->local_got_tls_type)
 566
 567 #define elf_x86_local_tlsdesc_gotent(abfd) \
 568   (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
 569
 570 #define elf_x86_compute_jump_table_size(htab) \
 571   ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
 572
 573 #define is_x86_elf(bfd, htab)                           \
 574   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 575    && elf_tdata (bfd) != NULL                           \
 576    && elf_object_id (bfd) == (htab)->target_id)
 577
 578 extern bfd_boolean _bfd_x86_elf_mkobject
 579   (bfd *);
 580
 581 extern void _bfd_x86_elf_set_tls_module_base
 582   (struct bfd_link_info *);
 583
 584 extern bfd_vma _bfd_x86_elf_dtpoff_base
 585   (struct bfd_link_info *);
 586
 587 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
 588   (struct elf_link_hash_entry *, void *);
 589
 590 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
 591   (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
 592    bfd_boolean);
 593
 594 extern hashval_t _bfd_x86_elf_local_htab_hash
 595   (const void *);
 596
 597 extern int _bfd_x86_elf_local_htab_eq
 598   (const void *, const void *);
 599
 600 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
 601   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 602
 603 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
 604   (bfd *);
 605
 606 extern int _bfd_x86_elf_compare_relocs
 607   (const void *, const void *);
 608
 609 extern bfd_boolean _bfd_x86_elf_link_check_relocs
 610   (bfd *, struct bfd_link_info *);
 611
 612 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
 613   (bfd *, struct bfd_link_info *);
 614
 615 extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections
 616   (bfd *, struct bfd_link_info *);
 617
 618 extern bfd_boolean _bfd_x86_elf_always_size_sections
 619   (bfd *, struct bfd_link_info *);
 620
 621 extern void _bfd_x86_elf_merge_symbol_attribute
 622   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 623    bfd_boolean, bfd_boolean);
 624
 625 extern void _bfd_x86_elf_copy_indirect_symbol
 626   (struct bfd_link_info *, struct elf_link_hash_entry *,
 627    struct elf_link_hash_entry *);
 628
 629 extern bfd_boolean _bfd_x86_elf_fixup_symbol
 630   (struct bfd_link_info *, struct elf_link_hash_entry *);
 631
 632 extern bfd_boolean _bfd_x86_elf_hash_symbol
 633   (struct elf_link_hash_entry *);
 634
 635 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
 636   (struct bfd_link_info *, struct elf_link_hash_entry *);
 637
 638 extern void _bfd_x86_elf_hide_symbol
 639   (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
 640
 641 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
 642   (struct bfd_link_info *, struct elf_link_hash_entry *);
 643
 644 extern asection * _bfd_x86_elf_gc_mark_hook
 645   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
 646    struct elf_link_hash_entry *, Elf_Internal_Sym *);
 647
 648 extern long _bfd_x86_elf_get_synthetic_symtab
 649   (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
 650    asymbol **);
 651
 652 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
 653   (bfd *, unsigned int, bfd_byte *, unsigned int);
 654
 655 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
 656   (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
 657
 658 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
 659   (struct bfd_link_info *, struct elf_x86_init_table *);
 660
 661 #define bfd_elf64_mkobject \
 662   _bfd_x86_elf_mkobject
 663 #define bfd_elf32_mkobject \
 664   _bfd_x86_elf_mkobject
 665 #define bfd_elf64_bfd_link_hash_table_create \
 666   _bfd_x86_elf_link_hash_table_create
 667 #define bfd_elf32_bfd_link_hash_table_create \
 668   _bfd_x86_elf_link_hash_table_create
 669 #define bfd_elf64_bfd_link_check_relocs \
 670   _bfd_x86_elf_link_check_relocs
 671 #define bfd_elf32_bfd_link_check_relocs \
 672   _bfd_x86_elf_link_check_relocs
 673
 674 #define elf_backend_size_dynamic_sections \
 675   _bfd_x86_elf_size_dynamic_sections
 676 #define elf_backend_always_size_sections \
 677   _bfd_x86_elf_always_size_sections
 678 #define elf_backend_merge_symbol_attribute \
 679   _bfd_x86_elf_merge_symbol_attribute
 680 #define elf_backend_copy_indirect_symbol \
 681   _bfd_x86_elf_copy_indirect_symbol
 682 #define elf_backend_fixup_symbol \
 683   _bfd_x86_elf_fixup_symbol
 684 #define elf_backend_hash_symbol \
 685   _bfd_x86_elf_hash_symbol
 686 #define elf_backend_adjust_dynamic_symbol \
 687   _bfd_x86_elf_adjust_dynamic_symbol
 688 #define elf_backend_gc_mark_hook \
 689   _bfd_x86_elf_gc_mark_hook
 690 #define elf_backend_omit_section_dynsym \
 691   ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
 692 #define elf_backend_parse_gnu_properties \
 693   _bfd_x86_elf_parse_gnu_properties
 694 #define elf_backend_merge_gnu_properties \
 695   _bfd_x86_elf_merge_gnu_properties