bfd/elfxx-x86.h

   1 /* x86 specific support for ELF
   2    Copyright (C) 2017-2018 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).
  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 relative relocation should be generated.  GOT reference to
 166    global symbol in PIC will lead to dynamic symbol.  It becomes a
 167    problem when "time" or "times" is defined as a variable in an
 168    executable, clashing with functions of the same name in libc.  If a
 169    symbol isn't undefined weak symbol, don't make it dynamic in PIC and
 170    generate relative relocation.  */
 171 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \
 172   ((H)->dynindx == -1 \
 173    && !(H)->forced_local \
 174    && (H)->root.type != bfd_link_hash_undefweak \
 175    && bfd_link_pic (INFO))
 176
 177 /* TRUE if this is a pointer reference to a local IFUNC.  */
 178 #define POINTER_LOCAL_IFUNC_P(INFO, H) \
 179   ((H)->dynindx == -1 \
 180    || (H)->forced_local \
 181    || bfd_link_executable (INFO))
 182
 183 /* TRUE if this is a PLT reference to a local IFUNC.  */
 184 #define PLT_LOCAL_IFUNC_P(INFO, H) \
 185   ((H)->dynindx == -1 \
 186    || ((bfd_link_executable (INFO) \
 187         || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
 188         && (H)->def_regular \
 189         && (H)->type == STT_GNU_IFUNC))
 190
 191 /* TRUE if TLS IE->LE transition is OK.  */
 192 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
 193   (bfd_link_executable (INFO) \
 194    && (H) != NULL \
 195    && (H)->dynindx == -1 \
 196    && (TLS_TYPE & GOT_TLS_IE))
 197
 198 /* Verify that the symbol has an entry in the procedure linkage table.  */
 199 #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \
 200   do \
 201     { \
 202       if (((H)->dynindx == -1 \
 203            && !LOCAL_UNDEFWEAK \
 204            && !(((H)->forced_local || bfd_link_executable (INFO)) \
 205                 && (H)->def_regular \
 206                 && (H)->type == STT_GNU_IFUNC)) \
 207           || (PLT) == NULL \
 208           || (GOTPLT) == NULL \
 209           || (RELPLT) == NULL) \
 210         abort (); \
 211     } \
 212   while (0);
 213
 214 /* Verify that the symbol supports copy relocation.  */
 215 #define VERIFY_COPY_RELOC(H, HTAB) \
 216   do \
 217     { \
 218       if ((H)->dynindx == -1 \
 219           || ((H)->root.type != bfd_link_hash_defined \
 220               && (H)->root.type != bfd_link_hash_defweak) \
 221           || (HTAB)->elf.srelbss == NULL \
 222           || (HTAB)->elf.sreldynrelro == NULL) \
 223         abort (); \
 224     } \
 225   while (0);
 226
 227 /* x86 ELF linker hash entry.  */
 228
 229 struct elf_x86_link_hash_entry
 230 {
 231   struct elf_link_hash_entry elf;
 232
 233   /* Track dynamic relocs copied for this symbol.  */
 234   struct elf_dyn_relocs *dyn_relocs;
 235
 236   unsigned char tls_type;
 237
 238   /* Bit 0: Symbol has no GOT nor PLT relocations.
 239      Bit 1: Symbol has non-GOT/non-PLT relocations in text sections.
 240      zero_undefweak is initialized to 1 and undefined weak symbol
 241      should be resolved to 0 if zero_undefweak > 0.  */
 242   unsigned int zero_undefweak : 2;
 243
 244   /* Don't call finish_dynamic_symbol on this symbol.  */
 245   unsigned int no_finish_dynamic_symbol : 1;
 246
 247   /* TRUE if symbol is __tls_get_addr.  */
 248   unsigned int tls_get_addr : 1;
 249
 250   /* TRUE if symbol is defined as a protected symbol.  */
 251   unsigned int def_protected : 1;
 252
 253   /* 0: Symbol references are unknown.
 254      1: Symbol references aren't local.
 255      2: Symbol references are local.
 256    */
 257   unsigned int local_ref : 2;
 258
 259   /* TRUE if symbol is defined by linker.  */
 260   unsigned int linker_def : 1;
 261
 262   /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
 263      only used by i386.  */
 264   unsigned int gotoff_ref : 1;
 265
 266   /* TRUE if a weak symbol with a real definition needs a copy reloc.
 267      When there is a weak symbol with a real definition, the processor
 268      independent code will have arranged for us to see the real
 269      definition first.  We need to copy the needs_copy bit from the
 270      real definition and check it when allowing copy reloc in PIE.  This
 271      is only used by x86-64.  */
 272   unsigned int needs_copy : 1;
 273
 274   /* Information about the GOT PLT entry. Filled when there are both
 275      GOT and PLT relocations against the same function.  */
 276   union gotplt_union plt_got;
 277
 278   /* Information about the second PLT entry.   */
 279   union gotplt_union plt_second;
 280
 281   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 282      starting at the end of the jump table.  */
 283   bfd_vma tlsdesc_got;
 284 };
 285
 286 struct elf_x86_lazy_plt_layout
 287 {
 288   /* The first entry in an absolute lazy procedure linkage table looks
 289      like this.  */
 290   const bfd_byte *plt0_entry;
 291   unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */
 292
 293   /* Later entries in an absolute lazy procedure linkage table look
 294      like this.  */
 295   const bfd_byte *plt_entry;
 296   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 297
 298   /* Offsets into plt0_entry that are to be replaced with GOT[1] and
 299      GOT[2].  */
 300   unsigned int plt0_got1_offset;
 301   unsigned int plt0_got2_offset;
 302
 303   /* Offset of the end of the PC-relative instruction containing
 304      plt0_got2_offset.  This is for x86-64 only.  */
 305   unsigned int plt0_got2_insn_end;
 306
 307   /* Offsets into plt_entry that are to be replaced with...  */
 308   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 309   unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
 310   unsigned int plt_plt_offset;    /* ... offset to start of .plt. */
 311
 312   /* Length of the PC-relative instruction containing plt_got_offset.
 313      This is used for x86-64 only.  */
 314   unsigned int plt_got_insn_size;
 315
 316   /* Offset of the end of the PC-relative jump to plt0_entry.  This is
 317      used for x86-64 only.  */
 318   unsigned int plt_plt_insn_end;
 319
 320   /* Offset into plt_entry where the initial value of the GOT entry
 321      points.  */
 322   unsigned int plt_lazy_offset;
 323
 324   /* The first entry in a PIC lazy procedure linkage table looks like
 325      this.  */
 326   const bfd_byte *pic_plt0_entry;
 327
 328   /* Subsequent entries in a PIC lazy procedure linkage table look
 329      like this.  */
 330   const bfd_byte *pic_plt_entry;
 331
 332   /* .eh_frame covering the lazy .plt section.  */
 333   const bfd_byte *eh_frame_plt;
 334   unsigned int eh_frame_plt_size;
 335 };
 336
 337 struct elf_x86_non_lazy_plt_layout
 338 {
 339   /* Entries in an absolute non-lazy procedure linkage table look like
 340      this.  */
 341   const bfd_byte *plt_entry;
 342   /* Entries in a PIC non-lazy procedure linkage table look like this.  */
 343   const bfd_byte *pic_plt_entry;
 344
 345   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 346
 347   /* Offsets into plt_entry that are to be replaced with...  */
 348   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 349
 350   /* Length of the PC-relative instruction containing plt_got_offset.
 351      This is used for x86-64 only.  */
 352   unsigned int plt_got_insn_size;
 353
 354   /* .eh_frame covering the non-lazy .plt section.  */
 355   const bfd_byte *eh_frame_plt;
 356   unsigned int eh_frame_plt_size;
 357 };
 358
 359 struct elf_x86_plt_layout
 360 {
 361   /* The first entry in a lazy procedure linkage table looks like this.
 362      This is only used for i386 where absolute PLT0 and PIC PLT0 are
 363      different.  */
 364   const bfd_byte *plt0_entry;
 365   /* Entries in a procedure linkage table look like this.  */
 366   const bfd_byte *plt_entry;
 367   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 368
 369   /* 1 has PLT0.  */
 370   unsigned int has_plt0;
 371
 372   /* Offsets into plt_entry that are to be replaced with...  */
 373   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 374
 375   /* Length of the PC-relative instruction containing plt_got_offset.
 376      This is only used for x86-64.  */
 377   unsigned int plt_got_insn_size;
 378
 379   /* .eh_frame covering the .plt section.  */
 380   const bfd_byte *eh_frame_plt;
 381   unsigned int eh_frame_plt_size;
 382 };
 383
 384 /* Values in tls_type of x86 ELF linker hash entry.  */
 385 #define GOT_UNKNOWN     0
 386 #define GOT_NORMAL      1
 387 #define GOT_TLS_GD      2
 388 #define GOT_TLS_IE      4
 389 #define GOT_TLS_IE_POS  5
 390 #define GOT_TLS_IE_NEG  6
 391 #define GOT_TLS_IE_BOTH 7
 392 #define GOT_TLS_GDESC   8
 393 #define GOT_TLS_GD_BOTH_P(type) \
 394   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 395 #define GOT_TLS_GD_P(type) \
 396   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 397 #define GOT_TLS_GDESC_P(type) \
 398   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 399 #define GOT_TLS_GD_ANY_P(type) \
 400   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 401
 402 #define elf_x86_hash_entry(ent) \
 403   ((struct elf_x86_link_hash_entry *)(ent))
 404
 405 enum elf_x86_target_os
 406 {
 407   is_normal,
 408   is_solaris,
 409   is_vxworks,
 410   is_nacl
 411 };
 412
 413 /* x86 ELF linker hash table.  */
 414
 415 struct elf_x86_link_hash_table
 416 {
 417   struct elf_link_hash_table elf;
 418
 419   /* Short-cuts to get to dynamic linker sections.  */
 420   asection *interp;
 421   asection *plt_eh_frame;
 422   asection *plt_second;
 423   asection *plt_second_eh_frame;
 424   asection *plt_got;
 425   asection *plt_got_eh_frame;
 426
 427   /* Parameters describing PLT generation, lazy or non-lazy.  */
 428   struct elf_x86_plt_layout plt;
 429
 430   /* Parameters describing lazy PLT generation.  */
 431   const struct elf_x86_lazy_plt_layout *lazy_plt;
 432
 433   /* Parameters describing non-lazy PLT generation.  */
 434   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 435
 436   union
 437   {
 438     bfd_signed_vma refcount;
 439     bfd_vma offset;
 440   } tls_ld_or_ldm_got;
 441
 442   /* The amount of space used by the jump slots in the GOT.  */
 443   bfd_vma sgotplt_jump_table_size;
 444
 445   /* Small local sym cache.  */
 446   struct sym_cache sym_cache;
 447
 448   /* _TLS_MODULE_BASE_ symbol.  */
 449   struct bfd_link_hash_entry *tls_module_base;
 450
 451   /* Used by local STT_GNU_IFUNC symbols.  */
 452   htab_t loc_hash_table;
 453   void * loc_hash_memory;
 454
 455   /* The offset into sgot of the GOT entry used by the PLT entry
 456      above.  */
 457   bfd_vma tlsdesc_got;
 458
 459   /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
 460   bfd_vma next_jump_slot_index;
 461   /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
 462   bfd_vma next_irelative_index;
 463
 464   /* TRUE if there are dynamic relocs against IFUNC symbols that apply
 465      to read-only sections.  */
 466   bfd_boolean readonly_dynrelocs_against_ifunc;
 467
 468   /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
 469      This is used for i386 only.  */
 470   asection *srelplt2;
 471
 472   /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
 473      is only used for i386.  */
 474   bfd_vma next_tls_desc_index;
 475
 476   /* The offset into splt of the PLT entry for the TLS descriptor
 477      resolver.  Special values are 0, if not necessary (or not found
 478      to be necessary yet), and -1 if needed but not determined
 479      yet.  This is only used for x86-64.  */
 480   bfd_vma tlsdesc_plt;
 481
 482    /* Value used to fill the unused bytes of the first PLT entry.  This
 483       is only used for i386.  */
 484   bfd_byte plt0_pad_byte;
 485
 486   /* TRUE if GOT is referenced.  */
 487   unsigned int got_referenced : 1;
 488
 489   /* TRUE if PLT is PC-relative.  PLT in PDE and PC-relative PLT in PIE
 490      can be used as function address.
 491
 492      NB: i386 has non-PIC PLT and PIC PLT.  Only non-PIC PLT in PDE can
 493      be used as function address.  PIC PLT in PIE can't be used as
 494      function address.  */
 495   unsigned int pcrel_plt : 1;
 496
 497   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 498   bfd_vma (*r_sym) (bfd_vma);
 499   bfd_boolean (*is_reloc_section) (const char *);
 500   enum elf_target_id target_id;
 501   enum elf_x86_target_os target_os;
 502   unsigned int sizeof_reloc;
 503   unsigned int dt_reloc;
 504   unsigned int dt_reloc_sz;
 505   unsigned int dt_reloc_ent;
 506   unsigned int got_entry_size;
 507   unsigned int pointer_r_type;
 508   int dynamic_interpreter_size;
 509   const char *dynamic_interpreter;
 510   const char *tls_get_addr;
 511 };
 512
 513 /* Architecture-specific backend data for x86.  */
 514
 515 struct elf_x86_backend_data
 516 {
 517   /* Target system.  */
 518   enum elf_x86_target_os target_os;
 519 };
 520
 521 #define get_elf_x86_backend_data(abfd) \
 522   ((const struct elf_x86_backend_data *) \
 523    get_elf_backend_data (abfd)->arch_data)
 524
 525 struct elf_x86_init_table
 526 {
 527   /* The lazy PLT layout.  */
 528   const struct elf_x86_lazy_plt_layout *lazy_plt;
 529
 530   /* The non-lazy PLT layout.  */
 531   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 532
 533   /* The lazy PLT layout for IBT.  */
 534   const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
 535
 536   /* The non-lazy PLT layout for IBT.  */
 537   const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
 538
 539   bfd_byte plt0_pad_byte;
 540
 541   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 542   bfd_vma (*r_sym) (bfd_vma);
 543 };
 544
 545 struct elf_x86_obj_tdata
 546 {
 547   struct elf_obj_tdata root;
 548
 549   /* tls_type for each local got entry.  */
 550   char *local_got_tls_type;
 551
 552   /* GOTPLT entries for TLS descriptors.  */
 553   bfd_vma *local_tlsdesc_gotent;
 554 };
 555
 556 enum elf_x86_plt_type
 557 {
 558   plt_non_lazy = 0,
 559   plt_lazy = 1 << 0,
 560   plt_pic = 1 << 1,
 561   plt_second = 1 << 2,
 562   plt_unknown = -1
 563 };
 564
 565 struct elf_x86_plt
 566 {
 567   const char *name;
 568   asection *sec;
 569   bfd_byte *contents;
 570   enum elf_x86_plt_type type;
 571   unsigned int plt_got_offset;
 572   unsigned int plt_entry_size;
 573   unsigned int plt_got_insn_size;       /* Only used for x86-64.  */
 574   long count;
 575 };
 576
 577 #define elf_x86_tdata(abfd) \
 578   ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
 579
 580 #define elf_x86_local_got_tls_type(abfd) \
 581   (elf_x86_tdata (abfd)->local_got_tls_type)
 582
 583 #define elf_x86_local_tlsdesc_gotent(abfd) \
 584   (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
 585
 586 #define elf_x86_compute_jump_table_size(htab) \
 587   ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
 588
 589 #define is_x86_elf(bfd, htab)                           \
 590   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 591    && elf_tdata (bfd) != NULL                           \
 592    && elf_object_id (bfd) == (htab)->target_id)
 593
 594 extern bfd_boolean _bfd_x86_elf_mkobject
 595   (bfd *);
 596
 597 extern void _bfd_x86_elf_set_tls_module_base
 598   (struct bfd_link_info *);
 599
 600 extern bfd_vma _bfd_x86_elf_dtpoff_base
 601   (struct bfd_link_info *);
 602
 603 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
 604   (struct elf_link_hash_entry *, void *);
 605
 606 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
 607   (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
 608    bfd_boolean);
 609
 610 extern hashval_t _bfd_x86_elf_local_htab_hash
 611   (const void *);
 612
 613 extern int _bfd_x86_elf_local_htab_eq
 614   (const void *, const void *);
 615
 616 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
 617   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 618
 619 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
 620   (bfd *);
 621
 622 extern int _bfd_x86_elf_compare_relocs
 623   (const void *, const void *);
 624
 625 extern bfd_boolean _bfd_x86_elf_link_check_relocs
 626   (bfd *, struct bfd_link_info *);
 627
 628 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
 629   (bfd *, struct bfd_link_info *);
 630
 631 extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections
 632   (bfd *, struct bfd_link_info *);
 633
 634 extern bfd_boolean _bfd_x86_elf_always_size_sections
 635   (bfd *, struct bfd_link_info *);
 636
 637 extern void _bfd_x86_elf_merge_symbol_attribute
 638   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 639    bfd_boolean, bfd_boolean);
 640
 641 extern void _bfd_x86_elf_copy_indirect_symbol
 642   (struct bfd_link_info *, struct elf_link_hash_entry *,
 643    struct elf_link_hash_entry *);
 644
 645 extern bfd_boolean _bfd_x86_elf_fixup_symbol
 646   (struct bfd_link_info *, struct elf_link_hash_entry *);
 647
 648 extern bfd_boolean _bfd_x86_elf_hash_symbol
 649   (struct elf_link_hash_entry *);
 650
 651 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
 652   (struct bfd_link_info *, struct elf_link_hash_entry *);
 653
 654 extern void _bfd_x86_elf_hide_symbol
 655   (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
 656
 657 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
 658   (struct bfd_link_info *, struct elf_link_hash_entry *);
 659
 660 extern asection * _bfd_x86_elf_gc_mark_hook
 661   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
 662    struct elf_link_hash_entry *, Elf_Internal_Sym *);
 663
 664 extern long _bfd_x86_elf_get_synthetic_symtab
 665   (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
 666    asymbol **);
 667
 668 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
 669   (bfd *, unsigned int, bfd_byte *, unsigned int);
 670
 671 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
 672   (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
 673
 674 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
 675   (struct bfd_link_info *, struct elf_x86_init_table *);
 676
 677 #define bfd_elf64_mkobject \
 678   _bfd_x86_elf_mkobject
 679 #define bfd_elf32_mkobject \
 680   _bfd_x86_elf_mkobject
 681 #define bfd_elf64_bfd_link_hash_table_create \
 682   _bfd_x86_elf_link_hash_table_create
 683 #define bfd_elf32_bfd_link_hash_table_create \
 684   _bfd_x86_elf_link_hash_table_create
 685 #define bfd_elf64_bfd_link_check_relocs \
 686   _bfd_x86_elf_link_check_relocs
 687 #define bfd_elf32_bfd_link_check_relocs \
 688   _bfd_x86_elf_link_check_relocs
 689
 690 #define elf_backend_size_dynamic_sections \
 691   _bfd_x86_elf_size_dynamic_sections
 692 #define elf_backend_always_size_sections \
 693   _bfd_x86_elf_always_size_sections
 694 #define elf_backend_merge_symbol_attribute \
 695   _bfd_x86_elf_merge_symbol_attribute
 696 #define elf_backend_copy_indirect_symbol \
 697   _bfd_x86_elf_copy_indirect_symbol
 698 #define elf_backend_fixup_symbol \
 699   _bfd_x86_elf_fixup_symbol
 700 #define elf_backend_hash_symbol \
 701   _bfd_x86_elf_hash_symbol
 702 #define elf_backend_adjust_dynamic_symbol \
 703   _bfd_x86_elf_adjust_dynamic_symbol
 704 #define elf_backend_gc_mark_hook \
 705   _bfd_x86_elf_gc_mark_hook
 706 #define elf_backend_omit_section_dynsym \
 707   ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true_any)
 708 #define elf_backend_parse_gnu_properties \
 709   _bfd_x86_elf_parse_gnu_properties
 710 #define elf_backend_merge_gnu_properties \
 711   _bfd_x86_elf_merge_gnu_properties