1 /* x86 specific support for ELF
2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
26 #include "bfd_stdint.h"
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
34 #define ABI_64_P(abfd) \
35 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
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
41 #define ELIMINATE_COPY_RELOCS 1
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)
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))
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)))
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)
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
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.
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) \
98 && (! (bfd_link_pie (INFO) \
99 || SYMBOLIC_BIND ((INFO), (H))) \
100 || (H)->root.type == bfd_link_hash_defweak \
101 || !(H)->def_regular)))) \
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) \
109 && ((H)->root.type == bfd_link_hash_defweak \
110 || !(H)->def_regular)))
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) \
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) \
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)))
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) \
145 && (H)->dynindx != -1 \
146 && (X86_PCREL_TYPE_P (R_TYPE) \
147 || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
148 || !(H)->def_regular))
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))
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))
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))
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))
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) \
191 && (H)->dynindx == -1 \
192 && (TLS_TYPE & GOT_TLS_IE))
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) \
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)) \
204 || (GOTPLT) == NULL \
205 || (RELPLT) == NULL) \
210 /* Verify that the symbol supports copy relocation. */
211 #define VERIFY_COPY_RELOC(H, HTAB) \
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) \
223 /* x86 ELF linker hash entry. */
225 struct elf_x86_link_hash_entry
227 struct elf_link_hash_entry elf;
229 /* Track dynamic relocs copied for this symbol. */
230 struct elf_dyn_relocs *dyn_relocs;
232 unsigned char tls_type;
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;
240 /* Don't call finish_dynamic_symbol on this symbol. */
241 unsigned int no_finish_dynamic_symbol : 1;
243 /* TRUE if symbol is __tls_get_addr. */
244 unsigned int tls_get_addr : 1;
246 /* TRUE if symbol is defined as a protected symbol. */
247 unsigned int def_protected : 1;
249 /* 0: Symbol references are unknown.
250 1: Symbol references aren't local.
251 2: Symbol references are local.
253 unsigned int local_ref : 2;
255 /* TRUE if symbol is defined by linker. */
256 unsigned int linker_def : 1;
258 /* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is
259 only used by i386. */
260 unsigned int gotoff_ref : 1;
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;
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;
274 /* Information about the second PLT entry. */
275 union gotplt_union plt_second;
277 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
278 starting at the end of the jump table. */
282 struct elf_x86_lazy_plt_layout
284 /* The first entry in an absolute lazy procedure linkage table looks
286 const bfd_byte *plt0_entry;
287 unsigned int plt0_entry_size; /* Size of PLT0 entry. */
289 /* Later entries in an absolute lazy procedure linkage table look
291 const bfd_byte *plt_entry;
292 unsigned int plt_entry_size; /* Size of each PLT entry. */
294 /* Offsets into plt0_entry that are to be replaced with GOT[1] and
296 unsigned int plt0_got1_offset;
297 unsigned int plt0_got2_offset;
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;
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. */
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;
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;
316 /* Offset into plt_entry where the initial value of the GOT entry
318 unsigned int plt_lazy_offset;
320 /* The first entry in a PIC lazy procedure linkage table looks like
322 const bfd_byte *pic_plt0_entry;
324 /* Subsequent entries in a PIC lazy procedure linkage table look
326 const bfd_byte *pic_plt_entry;
328 /* .eh_frame covering the lazy .plt section. */
329 const bfd_byte *eh_frame_plt;
330 unsigned int eh_frame_plt_size;
333 struct elf_x86_non_lazy_plt_layout
335 /* Entries in an absolute non-lazy procedure linkage table look like
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;
341 unsigned int plt_entry_size; /* Size of each PLT entry. */
343 /* Offsets into plt_entry that are to be replaced with... */
344 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
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;
350 /* .eh_frame covering the non-lazy .plt section. */
351 const bfd_byte *eh_frame_plt;
352 unsigned int eh_frame_plt_size;
355 struct elf_x86_plt_layout
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
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. */
366 unsigned int has_plt0;
368 /* Offsets into plt_entry that are to be replaced with... */
369 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
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;
375 /* .eh_frame covering the .plt section. */
376 const bfd_byte *eh_frame_plt;
377 unsigned int eh_frame_plt_size;
380 /* Values in tls_type of x86 ELF linker hash entry. */
381 #define GOT_UNKNOWN 0
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))
398 #define elf_x86_hash_entry(ent) \
399 ((struct elf_x86_link_hash_entry *)(ent))
401 enum elf_x86_target_os
409 /* x86 ELF linker hash table. */
411 struct elf_x86_link_hash_table
413 struct elf_link_hash_table elf;
415 /* Short-cuts to get to dynamic linker sections. */
417 asection *plt_eh_frame;
418 asection *plt_second;
419 asection *plt_second_eh_frame;
421 asection *plt_got_eh_frame;
423 /* Parameters describing PLT generation, lazy or non-lazy. */
424 struct elf_x86_plt_layout plt;
426 /* Parameters describing lazy PLT generation. */
427 const struct elf_x86_lazy_plt_layout *lazy_plt;
429 /* Parameters describing non-lazy PLT generation. */
430 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
434 bfd_signed_vma refcount;
438 /* The amount of space used by the jump slots in the GOT. */
439 bfd_vma sgotplt_jump_table_size;
441 /* Small local sym cache. */
442 struct sym_cache sym_cache;
444 /* _TLS_MODULE_BASE_ symbol. */
445 struct bfd_link_hash_entry *tls_module_base;
447 /* Used by local STT_GNU_IFUNC symbols. */
448 htab_t loc_hash_table;
449 void * loc_hash_memory;
451 /* The offset into sgot of the GOT entry used by the PLT entry
455 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
456 bfd_vma next_jump_slot_index;
457 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
458 bfd_vma next_irelative_index;
460 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
461 to read-only sections. */
462 bfd_boolean readonly_dynrelocs_against_ifunc;
464 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
465 This is used for i386 only. */
468 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This
469 is only used for i386. */
470 bfd_vma next_tls_desc_index;
472 /* The offset into splt of the PLT entry for the TLS descriptor
473 resolver. Special values are 0, if not necessary (or not found
474 to be necessary yet), and -1 if needed but not determined
475 yet. This is only used for x86-64. */
478 /* Value used to fill the unused bytes of the first PLT entry. This
479 is only used for i386. */
480 bfd_byte plt0_pad_byte;
482 /* TRUE if GOT is referenced. */
483 unsigned int got_referenced : 1;
485 bfd_vma (*r_info) (bfd_vma, bfd_vma);
486 bfd_vma (*r_sym) (bfd_vma);
487 bfd_boolean (*is_reloc_section) (const char *);
488 enum elf_target_id target_id;
489 enum elf_x86_target_os target_os;
490 unsigned int sizeof_reloc;
491 unsigned int dt_reloc;
492 unsigned int dt_reloc_sz;
493 unsigned int dt_reloc_ent;
494 unsigned int got_entry_size;
495 unsigned int pointer_r_type;
496 int dynamic_interpreter_size;
497 const char *dynamic_interpreter;
498 const char *tls_get_addr;
501 /* Architecture-specific backend data for x86. */
503 struct elf_x86_backend_data
506 enum elf_x86_target_os target_os;
509 #define get_elf_x86_backend_data(abfd) \
510 ((const struct elf_x86_backend_data *) \
511 get_elf_backend_data (abfd)->arch_data)
513 struct elf_x86_init_table
515 /* The lazy PLT layout. */
516 const struct elf_x86_lazy_plt_layout *lazy_plt;
518 /* The non-lazy PLT layout. */
519 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
521 /* The lazy PLT layout for IBT. */
522 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
524 /* The non-lazy PLT layout for IBT. */
525 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
527 bfd_byte plt0_pad_byte;
529 bfd_vma (*r_info) (bfd_vma, bfd_vma);
530 bfd_vma (*r_sym) (bfd_vma);
533 struct elf_x86_obj_tdata
535 struct elf_obj_tdata root;
537 /* tls_type for each local got entry. */
538 char *local_got_tls_type;
540 /* GOTPLT entries for TLS descriptors. */
541 bfd_vma *local_tlsdesc_gotent;
544 enum elf_x86_plt_type
558 enum elf_x86_plt_type type;
559 unsigned int plt_got_offset;
560 unsigned int plt_entry_size;
561 unsigned int plt_got_insn_size; /* Only used for x86-64. */
565 #define elf_x86_tdata(abfd) \
566 ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
568 #define elf_x86_local_got_tls_type(abfd) \
569 (elf_x86_tdata (abfd)->local_got_tls_type)
571 #define elf_x86_local_tlsdesc_gotent(abfd) \
572 (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
574 #define elf_x86_compute_jump_table_size(htab) \
575 ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
577 #define is_x86_elf(bfd, htab) \
578 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
579 && elf_tdata (bfd) != NULL \
580 && elf_object_id (bfd) == (htab)->target_id)
582 extern bfd_boolean _bfd_x86_elf_mkobject
585 extern void _bfd_x86_elf_set_tls_module_base
586 (struct bfd_link_info *);
588 extern bfd_vma _bfd_x86_elf_dtpoff_base
589 (struct bfd_link_info *);
591 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
592 (struct elf_link_hash_entry *, void *);
594 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
595 (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
598 extern hashval_t _bfd_x86_elf_local_htab_hash
601 extern int _bfd_x86_elf_local_htab_eq
602 (const void *, const void *);
604 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
605 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
607 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
610 extern int _bfd_x86_elf_compare_relocs
611 (const void *, const void *);
613 extern bfd_boolean _bfd_x86_elf_link_check_relocs
614 (bfd *, struct bfd_link_info *);
616 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
617 (bfd *, struct bfd_link_info *);
619 extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections
620 (bfd *, struct bfd_link_info *);
622 extern bfd_boolean _bfd_x86_elf_always_size_sections
623 (bfd *, struct bfd_link_info *);
625 extern void _bfd_x86_elf_merge_symbol_attribute
626 (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
627 bfd_boolean, bfd_boolean);
629 extern void _bfd_x86_elf_copy_indirect_symbol
630 (struct bfd_link_info *, struct elf_link_hash_entry *,
631 struct elf_link_hash_entry *);
633 extern bfd_boolean _bfd_x86_elf_fixup_symbol
634 (struct bfd_link_info *, struct elf_link_hash_entry *);
636 extern bfd_boolean _bfd_x86_elf_hash_symbol
637 (struct elf_link_hash_entry *);
639 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
640 (struct bfd_link_info *, struct elf_link_hash_entry *);
642 extern void _bfd_x86_elf_hide_symbol
643 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
645 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
646 (struct bfd_link_info *, struct elf_link_hash_entry *);
648 extern asection * _bfd_x86_elf_gc_mark_hook
649 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
650 struct elf_link_hash_entry *, Elf_Internal_Sym *);
652 extern long _bfd_x86_elf_get_synthetic_symtab
653 (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
656 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
657 (bfd *, unsigned int, bfd_byte *, unsigned int);
659 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
660 (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
662 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
663 (struct bfd_link_info *, struct elf_x86_init_table *);
665 #define bfd_elf64_mkobject \
666 _bfd_x86_elf_mkobject
667 #define bfd_elf32_mkobject \
668 _bfd_x86_elf_mkobject
669 #define bfd_elf64_bfd_link_hash_table_create \
670 _bfd_x86_elf_link_hash_table_create
671 #define bfd_elf32_bfd_link_hash_table_create \
672 _bfd_x86_elf_link_hash_table_create
673 #define bfd_elf64_bfd_link_check_relocs \
674 _bfd_x86_elf_link_check_relocs
675 #define bfd_elf32_bfd_link_check_relocs \
676 _bfd_x86_elf_link_check_relocs
678 #define elf_backend_size_dynamic_sections \
679 _bfd_x86_elf_size_dynamic_sections
680 #define elf_backend_always_size_sections \
681 _bfd_x86_elf_always_size_sections
682 #define elf_backend_merge_symbol_attribute \
683 _bfd_x86_elf_merge_symbol_attribute
684 #define elf_backend_copy_indirect_symbol \
685 _bfd_x86_elf_copy_indirect_symbol
686 #define elf_backend_fixup_symbol \
687 _bfd_x86_elf_fixup_symbol
688 #define elf_backend_hash_symbol \
689 _bfd_x86_elf_hash_symbol
690 #define elf_backend_adjust_dynamic_symbol \
691 _bfd_x86_elf_adjust_dynamic_symbol
692 #define elf_backend_gc_mark_hook \
693 _bfd_x86_elf_gc_mark_hook
694 #define elf_backend_omit_section_dynsym \
695 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true_any)
696 #define elf_backend_parse_gnu_properties \
697 _bfd_x86_elf_parse_gnu_properties
698 #define elf_backend_merge_gnu_properties \
699 _bfd_x86_elf_merge_gnu_properties