Allow gdb to find debug symbols file by build-id for PE file format also
[deliverable/binutils-gdb.git] / bfd / elf-bfd.h
1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2015 Free Software Foundation, Inc.
3 Written by Cygnus Support.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #ifndef _LIBELF_H_
23 #define _LIBELF_H_ 1
24
25 #include "elf/common.h"
26 #include "elf/external.h"
27 #include "elf/internal.h"
28 #include "bfdlink.h"
29
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33
34 /* The number of entries in a section is its size divided by the size
35 of a single entry. This is normally only applicable to reloc and
36 symbol table sections.
37 PR 9934: It is possible to have relocations that do not refer to
38 symbols, thus it is also possible to have a relocation section in
39 an object file, but no symbol table. */
40 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
41
42 /* If size isn't specified as 64 or 32, NAME macro should fail. */
43 #ifndef NAME
44 #if ARCH_SIZE == 64
45 #define NAME(x, y) x ## 64 ## _ ## y
46 #endif
47 #if ARCH_SIZE == 32
48 #define NAME(x, y) x ## 32 ## _ ## y
49 #endif
50 #endif
51
52 #ifndef NAME
53 #define NAME(x, y) x ## NOSIZE ## _ ## y
54 #endif
55
56 #define ElfNAME(X) NAME(Elf,X)
57 #define elfNAME(X) NAME(elf,X)
58
59 /* Information held for an ELF symbol. The first field is the
60 corresponding asymbol. Every symbol is an ELF file is actually a
61 pointer to this structure, although it is often handled as a
62 pointer to an asymbol. */
63
64 typedef struct
65 {
66 /* The BFD symbol. */
67 asymbol symbol;
68 /* ELF symbol information. */
69 Elf_Internal_Sym internal_elf_sym;
70 /* Backend specific information. */
71 union
72 {
73 unsigned int hppa_arg_reloc;
74 void *mips_extr;
75 void *any;
76 }
77 tc_data;
78
79 /* Version information. This is from an Elf_Internal_Versym
80 structure in a SHT_GNU_versym section. It is zero if there is no
81 version information. */
82 unsigned short version;
83
84 } elf_symbol_type;
85 \f
86 struct elf_strtab_hash;
87 struct got_entry;
88 struct plt_entry;
89
90 union gotplt_union
91 {
92 bfd_signed_vma refcount;
93 bfd_vma offset;
94 struct got_entry *glist;
95 struct plt_entry *plist;
96 };
97
98 struct elf_link_virtual_table_entry
99 {
100 /* Virtual table entry use information. This array is nominally of size
101 size/sizeof(target_void_pointer), though we have to be able to assume
102 and track a size while the symbol is still undefined. It is indexed
103 via offset/sizeof(target_void_pointer). */
104 size_t size;
105 bfd_boolean *used;
106
107 /* Virtual table derivation info. */
108 struct elf_link_hash_entry *parent;
109 };
110
111 /* ELF linker hash table entries. */
112
113 struct elf_link_hash_entry
114 {
115 struct bfd_link_hash_entry root;
116
117 /* Symbol index in output file. This is initialized to -1. It is
118 set to -2 if the symbol is used by a reloc. */
119 long indx;
120
121 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
122 -1 if this is not a dynamic symbol. */
123 /* ??? Note that this is consistently used as a synonym for tests
124 against whether we can perform various simplifying transformations
125 to the code. (E.g. changing a pc-relative jump to a PLT entry
126 into a pc-relative jump to the target function.) That test, which
127 is often relatively complex, and someplaces wrong or incomplete,
128 should really be replaced by a predicate in elflink.c.
129
130 End result: this field -1 does not indicate that the symbol is
131 not in the dynamic symbol table, but rather that the symbol is
132 not visible outside this DSO. */
133 long dynindx;
134
135 /* If this symbol requires an entry in the global offset table, the
136 processor specific backend uses this field to track usage and
137 final offset. Two schemes are supported: The first assumes that
138 a symbol may only have one GOT entry, and uses REFCOUNT until
139 size_dynamic_sections, at which point the contents of the .got is
140 fixed. Afterward, if OFFSET is -1, then the symbol does not
141 require a global offset table entry. The second scheme allows
142 multiple GOT entries per symbol, managed via a linked list
143 pointed to by GLIST. */
144 union gotplt_union got;
145
146 /* Same, but tracks a procedure linkage table entry. */
147 union gotplt_union plt;
148
149 /* Symbol size. */
150 bfd_size_type size;
151
152 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
153 unsigned int type : 8;
154
155 /* Symbol st_other value, symbol visibility. */
156 unsigned int other : 8;
157
158 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
159 unsigned int target_internal : 8;
160
161 /* Symbol is referenced by a non-shared object (other than the object
162 in which it is defined). */
163 unsigned int ref_regular : 1;
164 /* Symbol is defined by a non-shared object. */
165 unsigned int def_regular : 1;
166 /* Symbol is referenced by a shared object. */
167 unsigned int ref_dynamic : 1;
168 /* Symbol is defined by a shared object. */
169 unsigned int def_dynamic : 1;
170 /* Symbol has a non-weak reference from a non-shared object (other than
171 the object in which it is defined). */
172 unsigned int ref_regular_nonweak : 1;
173 /* Dynamic symbol has been adjustd. */
174 unsigned int dynamic_adjusted : 1;
175 /* Symbol needs a copy reloc. */
176 unsigned int needs_copy : 1;
177 /* Symbol needs a procedure linkage table entry. */
178 unsigned int needs_plt : 1;
179 /* Symbol appears in a non-ELF input file. */
180 unsigned int non_elf : 1;
181 /* Symbol should be marked as hidden in the version information. */
182 unsigned int hidden : 1;
183 /* Symbol was forced to local scope due to a version script file. */
184 unsigned int forced_local : 1;
185 /* Symbol was forced to be dynamic due to a version script file. */
186 unsigned int dynamic : 1;
187 /* Symbol was marked during garbage collection. */
188 unsigned int mark : 1;
189 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
190 not currently set by all the backends. */
191 unsigned int non_got_ref : 1;
192 /* Symbol has a definition in a shared object.
193 FIXME: There is no real need for this field if def_dynamic is never
194 cleared and all places that test def_dynamic also test def_regular. */
195 unsigned int dynamic_def : 1;
196 /* Symbol has a non-weak reference from a shared object. */
197 unsigned int ref_dynamic_nonweak : 1;
198 /* Symbol is referenced with a relocation where C/C++ pointer equality
199 matters. */
200 unsigned int pointer_equality_needed : 1;
201 /* Symbol is a unique global symbol. */
202 unsigned int unique_global : 1;
203 /* Symbol is defined by a shared library with non-default visibility
204 in a read/write section. */
205 unsigned int protected_def : 1;
206
207 /* String table index in .dynstr if this is a dynamic symbol. */
208 unsigned long dynstr_index;
209
210 union
211 {
212 /* If this is a weak defined symbol from a dynamic object, this
213 field points to a defined symbol with the same value, if there is
214 one. Otherwise it is NULL. */
215 struct elf_link_hash_entry *weakdef;
216
217 /* Hash value of the name computed using the ELF hash function.
218 Used part way through size_dynamic_sections, after we've finished
219 with weakdefs. */
220 unsigned long elf_hash_value;
221 } u;
222
223 /* Version information. */
224 union
225 {
226 /* This field is used for a symbol which is not defined in a
227 regular object. It points to the version information read in
228 from the dynamic object. */
229 Elf_Internal_Verdef *verdef;
230 /* This field is used for a symbol which is defined in a regular
231 object. It is set up in size_dynamic_sections. It points to
232 the version information we should write out for this symbol. */
233 struct bfd_elf_version_tree *vertree;
234 } verinfo;
235
236 struct elf_link_virtual_table_entry *vtable;
237 };
238
239 /* Will references to this symbol always reference the symbol
240 in this object? */
241 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
242 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
243
244 /* Will _calls_ to this symbol always call the version in this object? */
245 #define SYMBOL_CALLS_LOCAL(INFO, H) \
246 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
247
248 /* Common symbols that are turned into definitions don't have the
249 DEF_REGULAR flag set, so they might appear to be undefined.
250 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
251 #define ELF_COMMON_DEF_P(H) \
252 (!(H)->def_regular \
253 && !(H)->def_dynamic \
254 && (H)->root.type == bfd_link_hash_defined)
255
256 /* Records local symbols to be emitted in the dynamic symbol table. */
257
258 struct elf_link_local_dynamic_entry
259 {
260 struct elf_link_local_dynamic_entry *next;
261
262 /* The input bfd this symbol came from. */
263 bfd *input_bfd;
264
265 /* The index of the local symbol being copied. */
266 long input_indx;
267
268 /* The index in the outgoing dynamic symbol table. */
269 long dynindx;
270
271 /* A copy of the input symbol. */
272 Elf_Internal_Sym isym;
273 };
274
275 struct elf_link_loaded_list
276 {
277 struct elf_link_loaded_list *next;
278 bfd *abfd;
279 };
280
281 /* Structures used by the eh_frame optimization code. */
282 struct eh_cie_fde
283 {
284 union {
285 struct {
286 /* If REMOVED == 1, this is the CIE that the FDE originally used.
287 The CIE belongs to the same .eh_frame input section as the FDE.
288
289 If REMOVED == 0, this is the CIE that we have chosen to use for
290 the output FDE. The CIE's REMOVED field is also 0, but the CIE
291 might belong to a different .eh_frame input section from the FDE.
292
293 May be NULL to signify that the FDE should be discarded. */
294 struct eh_cie_fde *cie_inf;
295 struct eh_cie_fde *next_for_section;
296 } fde;
297 struct {
298 /* CIEs have three states:
299
300 - REMOVED && !MERGED: Slated for removal because we haven't yet
301 proven that an FDE needs it. FULL_CIE, if nonnull, points to
302 more detailed information about the CIE.
303
304 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
305 which may not belong to the same input section.
306
307 - !REMOVED: We have decided to keep this CIE. SEC is the
308 .eh_frame input section that contains the CIE. */
309 union {
310 struct cie *full_cie;
311 struct eh_cie_fde *merged_with;
312 asection *sec;
313 } u;
314
315 /* The offset of the personality data from the start of the CIE,
316 or 0 if the CIE doesn't have any. */
317 unsigned int personality_offset : 8;
318
319 /* True if we have marked relocations associated with this CIE. */
320 unsigned int gc_mark : 1;
321
322 /* True if we have decided to turn an absolute LSDA encoding into
323 a PC-relative one. */
324 unsigned int make_lsda_relative : 1;
325
326 /* True if we have decided to turn an absolute personality
327 encoding into a PC-relative one. */
328 unsigned int make_per_encoding_relative : 1;
329
330 /* True if the CIE contains personality data and if that
331 data uses a PC-relative encoding. Always true when
332 make_per_encoding_relative is. */
333 unsigned int per_encoding_relative : 1;
334
335 /* True if we need to add an 'R' (FDE encoding) entry to the
336 CIE's augmentation data. */
337 unsigned int add_fde_encoding : 1;
338
339 /* True if we have merged this CIE with another. */
340 unsigned int merged : 1;
341
342 /* Unused bits. */
343 unsigned int pad1 : 18;
344 } cie;
345 } u;
346 unsigned int reloc_index;
347 unsigned int size;
348 unsigned int offset;
349 unsigned int new_offset;
350 unsigned int fde_encoding : 8;
351 unsigned int lsda_encoding : 8;
352 unsigned int lsda_offset : 8;
353
354 /* True if this entry represents a CIE, false if it represents an FDE. */
355 unsigned int cie : 1;
356
357 /* True if this entry is currently marked for removal. */
358 unsigned int removed : 1;
359
360 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
361 augmentation data, and an associated byte to each of the CIE's FDEs. */
362 unsigned int add_augmentation_size : 1;
363
364 /* True if we have decided to convert absolute FDE relocations into
365 relative ones. This applies to the first relocation in the FDE,
366 which is against the code that the FDE describes. */
367 unsigned int make_relative : 1;
368
369 /* Unused bits. */
370 unsigned int pad1 : 4;
371
372 unsigned int *set_loc;
373 };
374
375 struct eh_frame_sec_info
376 {
377 unsigned int count;
378 struct cie *cies;
379 struct eh_cie_fde entry[1];
380 };
381
382 struct eh_frame_array_ent
383 {
384 bfd_vma initial_loc;
385 bfd_size_type range;
386 bfd_vma fde;
387 };
388
389 struct htab;
390
391 #define DWARF2_EH_HDR 1
392 #define COMPACT_EH_HDR 2
393
394 /* Endian-neutral code indicating that a function cannot be unwound. */
395 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
396
397 struct dwarf_eh_frame_hdr_info
398 {
399 struct htab *cies;
400 unsigned int fde_count;
401 /* TRUE if .eh_frame_hdr should contain the sorted search table.
402 We build it if we successfully read all .eh_frame input sections
403 and recognize them. */
404 bfd_boolean table;
405 struct eh_frame_array_ent *array;
406 };
407
408 struct compact_eh_frame_hdr_info
409 {
410 unsigned int allocated_entries;
411 /* eh_frame_entry fragments. */
412 asection **entries;
413 };
414
415 struct eh_frame_hdr_info
416 {
417 asection *hdr_sec;
418 unsigned int array_count;
419 bfd_boolean frame_hdr_is_compact;
420 union
421 {
422 struct dwarf_eh_frame_hdr_info dwarf;
423 struct compact_eh_frame_hdr_info compact;
424 }
425 u;
426 };
427
428 /* Enum used to identify target specific extensions to the elf_obj_tdata
429 and elf_link_hash_table structures. Note the enums deliberately start
430 from 1 so that we can detect an uninitialized field. The generic value
431 is last so that additions to this enum do not need to modify more than
432 one line. */
433 enum elf_target_id
434 {
435 AARCH64_ELF_DATA = 1,
436 ALPHA_ELF_DATA,
437 ARM_ELF_DATA,
438 AVR_ELF_DATA,
439 BFIN_ELF_DATA,
440 CRIS_ELF_DATA,
441 FRV_ELF_DATA,
442 HPPA32_ELF_DATA,
443 HPPA64_ELF_DATA,
444 I386_ELF_DATA,
445 IA64_ELF_DATA,
446 LM32_ELF_DATA,
447 M32R_ELF_DATA,
448 M68HC11_ELF_DATA,
449 M68K_ELF_DATA,
450 METAG_ELF_DATA,
451 MICROBLAZE_ELF_DATA,
452 MIPS_ELF_DATA,
453 MN10300_ELF_DATA,
454 NDS32_ELF_DATA,
455 NIOS2_ELF_DATA,
456 OR1K_ELF_DATA,
457 PPC32_ELF_DATA,
458 PPC64_ELF_DATA,
459 S390_ELF_DATA,
460 SH_ELF_DATA,
461 SPARC_ELF_DATA,
462 SPU_ELF_DATA,
463 TIC6X_ELF_DATA,
464 X86_64_ELF_DATA,
465 XTENSA_ELF_DATA,
466 XGATE_ELF_DATA,
467 TILEGX_ELF_DATA,
468 TILEPRO_ELF_DATA,
469 GENERIC_ELF_DATA
470 };
471
472 /* ELF linker hash table. */
473
474 struct elf_link_hash_table
475 {
476 struct bfd_link_hash_table root;
477
478 /* An identifier used to distinguish different target
479 specific extensions to this structure. */
480 enum elf_target_id hash_table_id;
481
482 /* Whether we have created the special dynamic sections required
483 when linking against or generating a shared object. */
484 bfd_boolean dynamic_sections_created;
485
486 /* True if this target has relocatable executables, so needs dynamic
487 section symbols. */
488 bfd_boolean is_relocatable_executable;
489
490 /* The BFD used to hold special sections created by the linker.
491 This will be the first BFD found which requires these sections to
492 be created. */
493 bfd *dynobj;
494
495 /* The value to use when initialising got.refcount/offset and
496 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
497 the values are refcounts. Set to init_got_offset/init_plt_offset
498 in size_dynamic_sections when the values may be offsets. */
499 union gotplt_union init_got_refcount;
500 union gotplt_union init_plt_refcount;
501
502 /* The value to use for got.refcount/offset and plt.refcount/offset
503 when the values may be offsets. Normally (bfd_vma) -1. */
504 union gotplt_union init_got_offset;
505 union gotplt_union init_plt_offset;
506
507 /* The number of symbols found in the link which must be put into
508 the .dynsym section. */
509 bfd_size_type dynsymcount;
510
511 /* The string table of dynamic symbols, which becomes the .dynstr
512 section. */
513 struct elf_strtab_hash *dynstr;
514
515 /* The number of buckets in the hash table in the .hash section.
516 This is based on the number of dynamic symbols. */
517 bfd_size_type bucketcount;
518
519 /* A linked list of DT_NEEDED names found in dynamic objects
520 included in the link. */
521 struct bfd_link_needed_list *needed;
522
523 /* Sections in the output bfd that provides a section symbol
524 to be used by relocations emitted against local symbols.
525 Most targets will not use data_index_section. */
526 asection *text_index_section;
527 asection *data_index_section;
528
529 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
530 struct elf_link_hash_entry *hgot;
531
532 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
533 struct elf_link_hash_entry *hplt;
534
535 /* The _DYNAMIC symbol. */
536 struct elf_link_hash_entry *hdynamic;
537
538 /* A pointer to information used to merge SEC_MERGE sections. */
539 void *merge_info;
540
541 /* Used to link stabs in sections. */
542 struct stab_info stab_info;
543
544 /* Used by eh_frame code when editing .eh_frame. */
545 struct eh_frame_hdr_info eh_info;
546
547 /* A linked list of local symbols to be added to .dynsym. */
548 struct elf_link_local_dynamic_entry *dynlocal;
549
550 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
551 objects included in the link. */
552 struct bfd_link_needed_list *runpath;
553
554 /* Cached first output tls section and size of PT_TLS segment. */
555 asection *tls_sec;
556 bfd_size_type tls_size;
557
558 /* A linked list of BFD's loaded in the link. */
559 struct elf_link_loaded_list *loaded;
560
561 /* Short-cuts to get to dynamic linker sections. */
562 asection *sgot;
563 asection *sgotplt;
564 asection *srelgot;
565 asection *splt;
566 asection *srelplt;
567 asection *igotplt;
568 asection *iplt;
569 asection *irelplt;
570 asection *irelifunc;
571 };
572
573 /* Look up an entry in an ELF linker hash table. */
574
575 #define elf_link_hash_lookup(table, string, create, copy, follow) \
576 ((struct elf_link_hash_entry *) \
577 bfd_link_hash_lookup (&(table)->root, (string), (create), \
578 (copy), (follow)))
579
580 /* Traverse an ELF linker hash table. */
581
582 #define elf_link_hash_traverse(table, func, info) \
583 (bfd_link_hash_traverse \
584 (&(table)->root, \
585 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
586 (info)))
587
588 /* Get the ELF linker hash table from a link_info structure. */
589
590 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
591
592 #define elf_hash_table_id(table) ((table) -> hash_table_id)
593
594 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
595 #define is_elf_hash_table(htab) \
596 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
597
598 /* Used by bfd_sym_from_r_symndx to cache a small number of local
599 symbols. */
600 #define LOCAL_SYM_CACHE_SIZE 32
601 struct sym_cache
602 {
603 bfd *abfd;
604 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
605 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
606 };
607 \f
608 /* Constant information held for an ELF backend. */
609
610 struct elf_size_info {
611 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
612 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
613
614 /* The size of entries in the .hash section. */
615 unsigned char sizeof_hash_entry;
616
617 /* The number of internal relocations to allocate per external
618 relocation entry. */
619 unsigned char int_rels_per_ext_rel;
620 /* We use some fixed size arrays. This should be large enough to
621 handle all back-ends. */
622 #define MAX_INT_RELS_PER_EXT_REL 3
623
624 unsigned char arch_size, log_file_align;
625 unsigned char elfclass, ev_current;
626 int (*write_out_phdrs)
627 (bfd *, const Elf_Internal_Phdr *, unsigned int);
628 bfd_boolean
629 (*write_shdrs_and_ehdr) (bfd *);
630 bfd_boolean (*checksum_contents)
631 (bfd * , void (*) (const void *, size_t, void *), void *);
632 void (*write_relocs)
633 (bfd *, asection *, void *);
634 bfd_boolean (*swap_symbol_in)
635 (bfd *, const void *, const void *, Elf_Internal_Sym *);
636 void (*swap_symbol_out)
637 (bfd *, const Elf_Internal_Sym *, void *, void *);
638 bfd_boolean (*slurp_reloc_table)
639 (bfd *, asection *, asymbol **, bfd_boolean);
640 long (*slurp_symbol_table)
641 (bfd *, asymbol **, bfd_boolean);
642 void (*swap_dyn_in)
643 (bfd *, const void *, Elf_Internal_Dyn *);
644 void (*swap_dyn_out)
645 (bfd *, const Elf_Internal_Dyn *, void *);
646
647 /* This function is called to swap in a REL relocation. If an
648 external relocation corresponds to more than one internal
649 relocation, then all relocations are swapped in at once. */
650 void (*swap_reloc_in)
651 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
652
653 /* This function is called to swap out a REL relocation. */
654 void (*swap_reloc_out)
655 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
656
657 /* This function is called to swap in a RELA relocation. If an
658 external relocation corresponds to more than one internal
659 relocation, then all relocations are swapped in at once. */
660 void (*swap_reloca_in)
661 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
662
663 /* This function is called to swap out a RELA relocation. */
664 void (*swap_reloca_out)
665 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
666 };
667
668 #define elf_symbol_from(ABFD,S) \
669 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
670 && (S)->the_bfd->tdata.elf_obj_data != 0) \
671 ? (elf_symbol_type *) (S) \
672 : 0)
673
674 enum elf_reloc_type_class {
675 reloc_class_normal,
676 reloc_class_relative,
677 reloc_class_plt,
678 reloc_class_copy,
679 reloc_class_ifunc
680 };
681
682 struct elf_reloc_cookie
683 {
684 Elf_Internal_Rela *rels, *rel, *relend;
685 Elf_Internal_Sym *locsyms;
686 bfd *abfd;
687 size_t locsymcount;
688 size_t extsymoff;
689 struct elf_link_hash_entry **sym_hashes;
690 int r_sym_shift;
691 bfd_boolean bad_symtab;
692 };
693
694 /* The level of IRIX compatibility we're striving for. */
695
696 typedef enum {
697 ict_none,
698 ict_irix5,
699 ict_irix6
700 } irix_compat_t;
701
702 /* Mapping of ELF section names and types. */
703 struct bfd_elf_special_section
704 {
705 const char *prefix;
706 int prefix_length;
707 /* 0 means name must match PREFIX exactly.
708 -1 means name must start with PREFIX followed by an arbitrary string.
709 -2 means name must match PREFIX exactly or consist of PREFIX followed
710 by a dot then anything.
711 > 0 means name must start with the first PREFIX_LENGTH chars of
712 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
713 int suffix_length;
714 int type;
715 bfd_vma attr;
716 };
717
718 enum action_discarded
719 {
720 COMPLAIN = 1,
721 PRETEND = 2
722 };
723
724 typedef asection * (*elf_gc_mark_hook_fn)
725 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
726 struct elf_link_hash_entry *, Elf_Internal_Sym *);
727
728 struct elf_backend_data
729 {
730 /* The architecture for this backend. */
731 enum bfd_architecture arch;
732
733 /* An identifier used to distinguish different target specific
734 extensions to elf_obj_tdata and elf_link_hash_table structures. */
735 enum elf_target_id target_id;
736
737 /* The ELF machine code (EM_xxxx) for this backend. */
738 int elf_machine_code;
739
740 /* EI_OSABI. */
741 int elf_osabi;
742
743 /* The maximum page size for this backend. */
744 bfd_vma maxpagesize;
745
746 /* The minimum page size for this backend. An input object will not be
747 considered page aligned unless its sections are correctly aligned for
748 pages at least this large. May be smaller than maxpagesize. */
749 bfd_vma minpagesize;
750
751 /* The common page size for this backend. */
752 bfd_vma commonpagesize;
753
754 /* The BFD flags applied to sections created for dynamic linking. */
755 flagword dynamic_sec_flags;
756
757 /* Architecture-specific data for this backend.
758 This is actually a pointer to some type like struct elf_ARCH_data. */
759 const void *arch_data;
760
761 /* A function to translate an ELF RELA relocation to a BFD arelent
762 structure. */
763 void (*elf_info_to_howto)
764 (bfd *, arelent *, Elf_Internal_Rela *);
765
766 /* A function to translate an ELF REL relocation to a BFD arelent
767 structure. */
768 void (*elf_info_to_howto_rel)
769 (bfd *, arelent *, Elf_Internal_Rela *);
770
771 /* A function to determine whether a symbol is global when
772 partitioning the symbol table into local and global symbols.
773 This should be NULL for most targets, in which case the correct
774 thing will be done. MIPS ELF, at least on the Irix 5, has
775 special requirements. */
776 bfd_boolean (*elf_backend_sym_is_global)
777 (bfd *, asymbol *);
778
779 /* The remaining functions are hooks which are called only if they
780 are not NULL. */
781
782 /* A function to permit a backend specific check on whether a
783 particular BFD format is relevant for an object file, and to
784 permit the backend to set any global information it wishes. When
785 this is called elf_elfheader is set, but anything else should be
786 used with caution. If this returns FALSE, the check_format
787 routine will return a bfd_error_wrong_format error. */
788 bfd_boolean (*elf_backend_object_p)
789 (bfd *);
790
791 /* A function to do additional symbol processing when reading the
792 ELF symbol table. This is where any processor-specific special
793 section indices are handled. */
794 void (*elf_backend_symbol_processing)
795 (bfd *, asymbol *);
796
797 /* A function to do additional symbol processing after reading the
798 entire ELF symbol table. */
799 bfd_boolean (*elf_backend_symbol_table_processing)
800 (bfd *, elf_symbol_type *, unsigned int);
801
802 /* A function to set the type of the info field. Processor-specific
803 types should be handled here. */
804 int (*elf_backend_get_symbol_type)
805 (Elf_Internal_Sym *, int);
806
807 /* A function to return the linker hash table entry of a symbol that
808 might be satisfied by an archive symbol. */
809 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
810 (bfd *, struct bfd_link_info *, const char *);
811
812 /* Return true if local section symbols should have a non-null st_name.
813 NULL implies false. */
814 bfd_boolean (*elf_backend_name_local_section_symbols)
815 (bfd *);
816
817 /* A function to do additional processing on the ELF section header
818 just before writing it out. This is used to set the flags and
819 type fields for some sections, or to actually write out data for
820 unusual sections. */
821 bfd_boolean (*elf_backend_section_processing)
822 (bfd *, Elf_Internal_Shdr *);
823
824 /* A function to handle unusual section types when creating BFD
825 sections from ELF sections. */
826 bfd_boolean (*elf_backend_section_from_shdr)
827 (bfd *, Elf_Internal_Shdr *, const char *, int);
828
829 /* A function to convert machine dependent ELF section header flags to
830 BFD internal section header flags. */
831 bfd_boolean (*elf_backend_section_flags)
832 (flagword *, const Elf_Internal_Shdr *);
833
834 /* A function that returns a struct containing ELF section flags and
835 type for the given BFD section. */
836 const struct bfd_elf_special_section * (*get_sec_type_attr)
837 (bfd *, asection *);
838
839 /* A function to handle unusual program segment types when creating BFD
840 sections from ELF program segments. */
841 bfd_boolean (*elf_backend_section_from_phdr)
842 (bfd *, Elf_Internal_Phdr *, int, const char *);
843
844 /* A function to set up the ELF section header for a BFD section in
845 preparation for writing it out. This is where the flags and type
846 fields are set for unusual sections. */
847 bfd_boolean (*elf_backend_fake_sections)
848 (bfd *, Elf_Internal_Shdr *, asection *);
849
850 /* A function to get the ELF section index for a BFD section. If
851 this returns TRUE, the section was found. If it is a normal ELF
852 section, *RETVAL should be left unchanged. If it is not a normal
853 ELF section *RETVAL should be set to the SHN_xxxx index. */
854 bfd_boolean (*elf_backend_section_from_bfd_section)
855 (bfd *, asection *, int *retval);
856
857 /* If this field is not NULL, it is called by the add_symbols phase
858 of a link just before adding a symbol to the global linker hash
859 table. It may modify any of the fields as it wishes. If *NAME
860 is set to NULL, the symbol will be skipped rather than being
861 added to the hash table. This function is responsible for
862 handling all processor dependent symbol bindings and section
863 indices, and must set at least *FLAGS and *SEC for each processor
864 dependent case; failure to do so will cause a link error. */
865 bfd_boolean (*elf_add_symbol_hook)
866 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
867 const char **name, flagword *flags, asection **sec, bfd_vma *value);
868
869 /* If this field is not NULL, it is called by the elf_link_output_sym
870 phase of a link for each symbol which will appear in the object file.
871 On error, this function returns 0. 1 is returned when the symbol
872 should be output, 2 is returned when the symbol should be discarded. */
873 int (*elf_backend_link_output_symbol_hook)
874 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
875 asection *, struct elf_link_hash_entry *);
876
877 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
878 linker the first time it encounters a dynamic object in the link.
879 This function must create any sections required for dynamic
880 linking. The ABFD argument is a dynamic object. The .interp,
881 .dynamic, .dynsym, .dynstr, and .hash functions have already been
882 created, and this function may modify the section flags if
883 desired. This function will normally create the .got and .plt
884 sections, but different backends have different requirements. */
885 bfd_boolean (*elf_backend_create_dynamic_sections)
886 (bfd *abfd, struct bfd_link_info *info);
887
888 /* When creating a shared library, determine whether to omit the
889 dynamic symbol for the section. */
890 bfd_boolean (*elf_backend_omit_section_dynsym)
891 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
892
893 /* Return TRUE if relocations of targets are compatible to the extent
894 that CHECK_RELOCS will properly process them. PR 4424. */
895 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
896
897 /* The CHECK_RELOCS function is called by the add_symbols phase of
898 the ELF backend linker. It is called once for each section with
899 relocs of an object file, just after the symbols for the object
900 file have been added to the global linker hash table. The
901 function must look through the relocs and do any special handling
902 required. This generally means allocating space in the global
903 offset table, and perhaps allocating space for a reloc. The
904 relocs are always passed as Rela structures; if the section
905 actually uses Rel structures, the r_addend field will always be
906 zero. */
907 bfd_boolean (*check_relocs)
908 (bfd *abfd, struct bfd_link_info *info, asection *o,
909 const Elf_Internal_Rela *relocs);
910
911 /* The CHECK_DIRECTIVES function is called once per input file by
912 the add_symbols phase of the ELF backend linker. The function
913 must inspect the bfd and create any additional symbols according
914 to any custom directives in the bfd. */
915 bfd_boolean (*check_directives)
916 (bfd *abfd, struct bfd_link_info *info);
917
918 /* The NOTICE_AS_NEEDED function is called as the linker is about to
919 handle an as-needed lib (ACT = notice_as_needed), and after the
920 linker has decided to keep the lib (ACT = notice_needed) or when
921 the lib is not needed (ACT = notice_not_needed). */
922 bfd_boolean (*notice_as_needed)
923 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
924
925 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
926 linker for every symbol which is defined by a dynamic object and
927 referenced by a regular object. This is called after all the
928 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
929 function has been called. The hash table entry should be
930 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
931 defined in a section from a dynamic object. Dynamic object
932 sections are not included in the final link, and this function is
933 responsible for changing the value to something which the rest of
934 the link can deal with. This will normally involve adding an
935 entry to the .plt or .got or some such section, and setting the
936 symbol to point to that. */
937 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
938 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
939
940 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
941 after all the linker input files have been seen but before the
942 section sizes have been set. This is called after
943 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
944 bfd_boolean (*elf_backend_always_size_sections)
945 (bfd *output_bfd, struct bfd_link_info *info);
946
947 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
948 linker after all the linker input files have been seen but before
949 the sections sizes have been set. This is called after
950 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
951 It is only called when linking against a dynamic object. It must
952 set the sizes of the dynamic sections, and may fill in their
953 contents as well. The generic ELF linker can handle the .dynsym,
954 .dynstr and .hash sections. This function must handle the
955 .interp section and any sections created by the
956 CREATE_DYNAMIC_SECTIONS entry point. */
957 bfd_boolean (*elf_backend_size_dynamic_sections)
958 (bfd *output_bfd, struct bfd_link_info *info);
959
960 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
961 we keep to use as a base for relocs and symbols. */
962 void (*elf_backend_init_index_section)
963 (bfd *output_bfd, struct bfd_link_info *info);
964
965 /* The RELOCATE_SECTION function is called by the ELF backend linker
966 to handle the relocations for a section.
967
968 The relocs are always passed as Rela structures; if the section
969 actually uses Rel structures, the r_addend field will always be
970 zero.
971
972 This function is responsible for adjust the section contents as
973 necessary, and (if using Rela relocs and generating a
974 relocatable output file) adjusting the reloc addend as
975 necessary.
976
977 This function does not have to worry about setting the reloc
978 address or the reloc symbol index.
979
980 LOCAL_SYMS is a pointer to the swapped in local symbols.
981
982 LOCAL_SECTIONS is an array giving the section in the input file
983 corresponding to the st_shndx field of each local symbol.
984
985 The global hash table entry for the global symbols can be found
986 via elf_sym_hashes (input_bfd).
987
988 When generating relocatable output, this function must handle
989 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
990 going to be the section symbol corresponding to the output
991 section, which means that the addend must be adjusted
992 accordingly.
993
994 Returns FALSE on error, TRUE on success, 2 if successful and
995 relocations should be written for this section. */
996 int (*elf_backend_relocate_section)
997 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
998 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
999 Elf_Internal_Sym *local_syms, asection **local_sections);
1000
1001 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1002 linker just before it writes a symbol out to the .dynsym section.
1003 The processor backend may make any required adjustment to the
1004 symbol. It may also take the opportunity to set contents of the
1005 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1006 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1007 on those symbols which are defined by a dynamic object. */
1008 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1009 (bfd *output_bfd, struct bfd_link_info *info,
1010 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1011
1012 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1013 linker just before it writes all the dynamic sections out to the
1014 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1015 all dynamic symbols. */
1016 bfd_boolean (*elf_backend_finish_dynamic_sections)
1017 (bfd *output_bfd, struct bfd_link_info *info);
1018
1019 /* A function to do any beginning processing needed for the ELF file
1020 before building the ELF headers and computing file positions. */
1021 void (*elf_backend_begin_write_processing)
1022 (bfd *, struct bfd_link_info *);
1023
1024 /* A function to do any final processing needed for the ELF file
1025 before writing it out. The LINKER argument is TRUE if this BFD
1026 was created by the ELF backend linker. */
1027 void (*elf_backend_final_write_processing)
1028 (bfd *, bfd_boolean linker);
1029
1030 /* This function is called by get_program_header_size. It should
1031 return the number of additional program segments which this BFD
1032 will need. It should return -1 on error. */
1033 int (*elf_backend_additional_program_headers)
1034 (bfd *, struct bfd_link_info *);
1035
1036 /* This function is called to modify an existing segment map in a
1037 backend specific fashion. */
1038 bfd_boolean (*elf_backend_modify_segment_map)
1039 (bfd *, struct bfd_link_info *);
1040
1041 /* This function is called to modify program headers just before
1042 they are written. */
1043 bfd_boolean (*elf_backend_modify_program_headers)
1044 (bfd *, struct bfd_link_info *);
1045
1046 /* This function is called before section garbage collection to
1047 mark entry symbol sections. */
1048 void (*gc_keep)
1049 (struct bfd_link_info *);
1050
1051 /* This function is called during section garbage collection to
1052 mark sections that define global symbols. */
1053 bfd_boolean (*gc_mark_dynamic_ref)
1054 (struct elf_link_hash_entry *, void *);
1055
1056 /* This function is called during section gc to discover the section a
1057 particular relocation refers to. */
1058 elf_gc_mark_hook_fn gc_mark_hook;
1059
1060 /* This function, if defined, is called after the first gc marking pass
1061 to allow the backend to mark additional sections. */
1062 bfd_boolean (*gc_mark_extra_sections)
1063 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1064
1065 /* This function, if defined, is called during the sweep phase of gc
1066 in order that a backend might update any data structures it might
1067 be maintaining. */
1068 bfd_boolean (*gc_sweep_hook)
1069 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1070
1071 /* This function, if defined, is called after the ELF headers have
1072 been created. This allows for things like the OS and ABI versions
1073 to be changed. */
1074 void (*elf_backend_post_process_headers)
1075 (bfd *, struct bfd_link_info *);
1076
1077 /* This function, if defined, prints a symbol to file and returns the
1078 name of the symbol to be printed. It should return NULL to fall
1079 back to default symbol printing. */
1080 const char *(*elf_backend_print_symbol_all)
1081 (bfd *, void *, asymbol *);
1082
1083 /* This function, if defined, is called after all local symbols and
1084 global symbols converted to locals are emitted into the symtab
1085 section. It allows the backend to emit special local symbols
1086 not handled in the hash table. */
1087 bfd_boolean (*elf_backend_output_arch_local_syms)
1088 (bfd *, struct bfd_link_info *, void *,
1089 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1090 struct elf_link_hash_entry *));
1091
1092 /* This function, if defined, is called after all symbols are emitted
1093 into the symtab section. It allows the backend to emit special
1094 global symbols not handled in the hash table. */
1095 bfd_boolean (*elf_backend_output_arch_syms)
1096 (bfd *, struct bfd_link_info *, void *,
1097 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1098 struct elf_link_hash_entry *));
1099
1100 /* Copy any information related to dynamic linking from a pre-existing
1101 symbol to a newly created symbol. Also called to copy flags and
1102 other back-end info to a weakdef, in which case the symbol is not
1103 newly created and plt/got refcounts and dynamic indices should not
1104 be copied. */
1105 void (*elf_backend_copy_indirect_symbol)
1106 (struct bfd_link_info *, struct elf_link_hash_entry *,
1107 struct elf_link_hash_entry *);
1108
1109 /* Modify any information related to dynamic linking such that the
1110 symbol is not exported. */
1111 void (*elf_backend_hide_symbol)
1112 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1113
1114 /* A function to do additional symbol fixup, called by
1115 _bfd_elf_fix_symbol_flags. */
1116 bfd_boolean (*elf_backend_fixup_symbol)
1117 (struct bfd_link_info *, struct elf_link_hash_entry *);
1118
1119 /* Merge the backend specific symbol attribute. */
1120 void (*elf_backend_merge_symbol_attribute)
1121 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1122 bfd_boolean);
1123
1124 /* This function, if defined, will return a string containing the
1125 name of a target-specific dynamic tag. */
1126 char *(*elf_backend_get_target_dtag)
1127 (bfd_vma);
1128
1129 /* Decide whether an undefined symbol is special and can be ignored.
1130 This is the case for OPTIONAL symbols on IRIX. */
1131 bfd_boolean (*elf_backend_ignore_undef_symbol)
1132 (struct elf_link_hash_entry *);
1133
1134 /* Emit relocations. Overrides default routine for emitting relocs,
1135 except during a relocatable link, or if all relocs are being emitted. */
1136 bfd_boolean (*elf_backend_emit_relocs)
1137 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1138 struct elf_link_hash_entry **);
1139
1140 /* Count relocations. Not called for relocatable links
1141 or if all relocs are being preserved in the output. */
1142 unsigned int (*elf_backend_count_relocs)
1143 (struct bfd_link_info *, asection *);
1144
1145 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1146 by r_offset. If NULL, default to true. */
1147 bfd_boolean (*sort_relocs_p)
1148 (asection *);
1149
1150 /* This function, if defined, is called when an NT_PRSTATUS note is found
1151 in a core file. */
1152 bfd_boolean (*elf_backend_grok_prstatus)
1153 (bfd *, Elf_Internal_Note *);
1154
1155 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1156 note is found in a core file. */
1157 bfd_boolean (*elf_backend_grok_psinfo)
1158 (bfd *, Elf_Internal_Note *);
1159
1160 /* This function, if defined, is called to write a note to a corefile. */
1161 char *(*elf_backend_write_core_note)
1162 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1163
1164 /* This function, if defined, is called to convert target-specific
1165 section flag names into hex values. */
1166 flagword (*elf_backend_lookup_section_flags_hook)
1167 (char *);
1168
1169 /* This function returns class of a reloc type. */
1170 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1171 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1172
1173 /* This function, if defined, removes information about discarded functions
1174 from other sections which mention them. */
1175 bfd_boolean (*elf_backend_discard_info)
1176 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1177
1178 /* This function, if defined, signals that the function above has removed
1179 the discarded relocations for this section. */
1180 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1181 (asection *);
1182
1183 /* What to do when ld finds relocations against symbols defined in
1184 discarded sections. */
1185 unsigned int (*action_discarded)
1186 (asection *);
1187
1188 /* This function returns the width of FDE pointers in bytes, or 0 if
1189 that can't be determined for some reason. The default definition
1190 goes by the bfd's EI_CLASS. */
1191 unsigned int (*elf_backend_eh_frame_address_size)
1192 (bfd *, asection *);
1193
1194 /* These functions tell elf-eh-frame whether to attempt to turn
1195 absolute or lsda encodings into pc-relative ones. The default
1196 definition enables these transformations. */
1197 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1198 (bfd *, struct bfd_link_info *, asection *);
1199 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1200 (bfd *, struct bfd_link_info *, asection *);
1201
1202 /* This function returns an encoding after computing the encoded
1203 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1204 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1205 The default definition chooses a 32-bit PC-relative encoding. */
1206 bfd_byte (*elf_backend_encode_eh_address)
1207 (bfd *abfd, struct bfd_link_info *info,
1208 asection *osec, bfd_vma offset,
1209 asection *loc_sec, bfd_vma loc_offset,
1210 bfd_vma *encoded);
1211
1212 /* This function, if defined, may write out the given section.
1213 Returns TRUE if it did so and FALSE if the caller should. */
1214 bfd_boolean (*elf_backend_write_section)
1215 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1216
1217 /* The level of IRIX compatibility we're striving for.
1218 MIPS ELF specific function. */
1219 irix_compat_t (*elf_backend_mips_irix_compat)
1220 (bfd *);
1221
1222 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1223 (unsigned int, bfd_boolean);
1224
1225 /* The swapping table to use when dealing with ECOFF information.
1226 Used for the MIPS ELF .mdebug section. */
1227 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1228
1229 /* This function implements `bfd_elf_bfd_from_remote_memory';
1230 see elf.c, elfcode.h. */
1231 bfd *(*elf_backend_bfd_from_remote_memory)
1232 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1233 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1234 bfd_size_type len));
1235
1236 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1237 see elf.c. */
1238 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1239
1240 /* Is symbol defined in common section? */
1241 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1242
1243 /* Return a common section index for section. */
1244 unsigned int (*common_section_index) (asection *);
1245
1246 /* Return a common section for section. */
1247 asection *(*common_section) (asection *);
1248
1249 /* Return TRUE if we can merge 2 definitions. */
1250 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1251 const Elf_Internal_Sym *, asection **,
1252 bfd_boolean, bfd_boolean,
1253 bfd *, const asection *);
1254
1255 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1256 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1257
1258 /* Return TRUE if type is a function symbol type. */
1259 bfd_boolean (*is_function_type) (unsigned int type);
1260
1261 /* If the ELF symbol SYM might be a function in SEC, return the
1262 function size and set *CODE_OFF to the function's entry point,
1263 otherwise return zero. */
1264 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1265 bfd_vma *code_off);
1266
1267 /* Return the section which RELOC_SEC applies to. */
1268 asection *(*get_reloc_section) (asection *reloc_sec);
1269
1270 /* Used to handle bad SHF_LINK_ORDER input. */
1271 bfd_error_handler_type link_order_error_handler;
1272
1273 /* Name of the PLT relocation section. */
1274 const char *relplt_name;
1275
1276 /* Alternate EM_xxxx machine codes for this backend. */
1277 int elf_machine_alt1;
1278 int elf_machine_alt2;
1279
1280 const struct elf_size_info *s;
1281
1282 /* An array of target specific special sections. */
1283 const struct bfd_elf_special_section *special_sections;
1284
1285 /* The size in bytes of the header for the GOT. This includes the
1286 so-called reserved entries on some systems. */
1287 bfd_vma got_header_size;
1288
1289 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1290 otherwise by the local symbol with index SYMNDX in IBFD. */
1291 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1292 struct elf_link_hash_entry *h,
1293 bfd *ibfd, unsigned long symndx);
1294
1295 /* The vendor name to use for a processor-standard attributes section. */
1296 const char *obj_attrs_vendor;
1297
1298 /* The section name to use for a processor-standard attributes section. */
1299 const char *obj_attrs_section;
1300
1301 /* Return 1, 2 or 3 to indicate what type of arguments a
1302 processor-specific tag takes. */
1303 int (*obj_attrs_arg_type) (int);
1304
1305 /* The section type to use for an attributes section. */
1306 unsigned int obj_attrs_section_type;
1307
1308 /* This function determines the order in which any attributes are
1309 written. It must be defined for input in the range
1310 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1311 is used in order to make unity easy). The returned value is the
1312 actual tag number to place in the input position. */
1313 int (*obj_attrs_order) (int);
1314
1315 /* Handle merging unknown attributes; either warn and return TRUE,
1316 or give an error and return FALSE. */
1317 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1318
1319 /* Encoding used for compact EH tables. */
1320 int (*compact_eh_encoding) (struct bfd_link_info *);
1321
1322 /* Opcode representing no unwind. */
1323 int (*cant_unwind_opcode) (struct bfd_link_info *);
1324
1325 /* This is non-zero if static TLS segments require a special alignment. */
1326 unsigned static_tls_alignment;
1327
1328 /* Alignment for the PT_GNU_STACK segment. */
1329 unsigned stack_align;
1330
1331 /* This is TRUE if the linker should act like collect and gather
1332 global constructors and destructors by name. This is TRUE for
1333 MIPS ELF because the Irix 5 tools can not handle the .init
1334 section. */
1335 unsigned collect : 1;
1336
1337 /* This is TRUE if the linker should ignore changes to the type of a
1338 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1339 record undefined functions as STT_OBJECT although the definitions
1340 are STT_FUNC. */
1341 unsigned type_change_ok : 1;
1342
1343 /* Whether the backend may use REL relocations. (Some backends use
1344 both REL and RELA relocations, and this flag is set for those
1345 backends.) */
1346 unsigned may_use_rel_p : 1;
1347
1348 /* Whether the backend may use RELA relocations. (Some backends use
1349 both REL and RELA relocations, and this flag is set for those
1350 backends.) */
1351 unsigned may_use_rela_p : 1;
1352
1353 /* Whether the default relocation type is RELA. If a backend with
1354 this flag set wants REL relocations for a particular section,
1355 it must note that explicitly. Similarly, if this flag is clear,
1356 and the backend wants RELA relocations for a particular
1357 section. */
1358 unsigned default_use_rela_p : 1;
1359
1360 /* True if PLT and copy relocations should be RELA by default. */
1361 unsigned rela_plts_and_copies_p : 1;
1362
1363 /* Set if RELA relocations for a relocatable link can be handled by
1364 generic code. Backends that set this flag need do nothing in the
1365 backend relocate_section routine for relocatable linking. */
1366 unsigned rela_normal : 1;
1367
1368 /* TRUE if addresses "naturally" sign extend. This is used when
1369 swapping in from Elf32 when BFD64. */
1370 unsigned sign_extend_vma : 1;
1371
1372 unsigned want_got_plt : 1;
1373 unsigned plt_readonly : 1;
1374 unsigned want_plt_sym : 1;
1375 unsigned plt_not_loaded : 1;
1376 unsigned plt_alignment : 4;
1377 unsigned can_gc_sections : 1;
1378 unsigned can_refcount : 1;
1379 unsigned want_got_sym : 1;
1380 unsigned want_dynbss : 1;
1381
1382 /* Targets which do not support physical addressing often require
1383 that the p_paddr field in the section header to be set to zero.
1384 This field indicates whether this behavior is required. */
1385 unsigned want_p_paddr_set_to_zero : 1;
1386
1387 /* True if an object file lacking a .note.GNU-stack section
1388 should be assumed to be requesting exec stack. At least one
1389 other file in the link needs to have a .note.GNU-stack section
1390 for a PT_GNU_STACK segment to be created. */
1391 unsigned default_execstack : 1;
1392
1393 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1394 in length rather than sec->size in length, if sec->rawsize is
1395 non-zero and smaller than sec->size. */
1396 unsigned caches_rawsize : 1;
1397
1398 /* Address of protected data defined in the shared library may be
1399 external, i.e., due to copy relocation. */
1400 unsigned extern_protected_data : 1;
1401 };
1402
1403 /* Information about reloc sections associated with a bfd_elf_section_data
1404 structure. */
1405 struct bfd_elf_section_reloc_data
1406 {
1407 /* The ELF header for the reloc section associated with this
1408 section, if any. */
1409 Elf_Internal_Shdr *hdr;
1410 /* The number of relocations currently assigned to HDR. */
1411 unsigned int count;
1412 /* The ELF section number of the reloc section. Only used for an
1413 output file. */
1414 int idx;
1415 /* Used by the backend linker to store the symbol hash table entries
1416 associated with relocs against global symbols. */
1417 struct elf_link_hash_entry **hashes;
1418 };
1419
1420 /* Information stored for each BFD section in an ELF file. This
1421 structure is allocated by elf_new_section_hook. */
1422
1423 struct bfd_elf_section_data
1424 {
1425 /* The ELF header for this section. */
1426 Elf_Internal_Shdr this_hdr;
1427
1428 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1429 struct flag_info *section_flag_info;
1430
1431 /* Information about the REL and RELA reloc sections associated
1432 with this section, if any. */
1433 struct bfd_elf_section_reloc_data rel, rela;
1434
1435 /* The ELF section number of this section. */
1436 int this_idx;
1437
1438 /* Used by the backend linker when generating a shared library to
1439 record the dynamic symbol index for a section symbol
1440 corresponding to this section. A value of 0 means that there is
1441 no dynamic symbol for this section. */
1442 int dynindx;
1443
1444 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1445 asection *linked_to;
1446
1447 /* A pointer to the swapped relocs. If the section uses REL relocs,
1448 rather than RELA, all the r_addend fields will be zero. This
1449 pointer may be NULL. It is used by the backend linker. */
1450 Elf_Internal_Rela *relocs;
1451
1452 /* A pointer to a linked list tracking dynamic relocs copied for
1453 local symbols. */
1454 void *local_dynrel;
1455
1456 /* A pointer to the bfd section used for dynamic relocs. */
1457 asection *sreloc;
1458
1459 union {
1460 /* Group name, if this section is a member of a group. */
1461 const char *name;
1462
1463 /* Group signature sym, if this is the SHT_GROUP section. */
1464 struct bfd_symbol *id;
1465 } group;
1466
1467 /* For a member of a group, points to the SHT_GROUP section.
1468 NULL for the SHT_GROUP section itself and non-group sections. */
1469 asection *sec_group;
1470
1471 /* A linked list of member sections in the group. Circular when used by
1472 the linker. For the SHT_GROUP section, points at first member. */
1473 asection *next_in_group;
1474
1475 /* The FDEs associated with this section. The u.fde.next_in_section
1476 field acts as a chain pointer. */
1477 struct eh_cie_fde *fde_list;
1478
1479 /* Link from a text section to its .eh_frame_entry section. */
1480 asection *eh_frame_entry;
1481
1482 /* A pointer used for various section optimizations. */
1483 void *sec_info;
1484 };
1485
1486 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1487 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1488 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1489 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1490 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1491 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1492 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1493 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1494 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1495 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1496
1497 #define xvec_get_elf_backend_data(xvec) \
1498 ((const struct elf_backend_data *) (xvec)->backend_data)
1499
1500 #define get_elf_backend_data(abfd) \
1501 xvec_get_elf_backend_data ((abfd)->xvec)
1502
1503 /* The least object attributes (within an attributes subsection) known
1504 for any target. Some code assumes that the value 0 is not used and
1505 the field for that attribute can instead be used as a marker to
1506 indicate that attributes have been initialized. */
1507 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1508
1509 /* The maximum number of known object attributes for any target. */
1510 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1511
1512 /* The value of an object attribute. The type indicates whether the attribute
1513 holds and integer, a string, or both. It can also indicate that there can
1514 be no default (i.e. all values must be written to file, even zero). */
1515
1516 typedef struct obj_attribute
1517 {
1518 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1519 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1520 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1521
1522 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1523 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1524 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1525
1526 int type;
1527 unsigned int i;
1528 char *s;
1529 } obj_attribute;
1530
1531 typedef struct obj_attribute_list
1532 {
1533 struct obj_attribute_list *next;
1534 int tag;
1535 obj_attribute attr;
1536 } obj_attribute_list;
1537
1538 /* Object attributes may either be defined by the processor ABI, index
1539 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1540 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1541 #define OBJ_ATTR_PROC 0
1542 #define OBJ_ATTR_GNU 1
1543 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1544 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1545
1546 /* The following object attribute tags are taken as generic, for all
1547 targets and for "gnu" where there is no target standard. */
1548 enum
1549 {
1550 Tag_NULL = 0,
1551 Tag_File = 1,
1552 Tag_Section = 2,
1553 Tag_Symbol = 3,
1554 Tag_compatibility = 32
1555 };
1556
1557 /* The following struct stores information about every SystemTap section
1558 found in the object file. */
1559 struct sdt_note
1560 {
1561 struct sdt_note *next;
1562 bfd_size_type size;
1563 bfd_byte data[1];
1564 };
1565
1566 /* tdata information grabbed from an elf core file. */
1567 struct core_elf_obj_tdata
1568 {
1569 int signal;
1570 int pid;
1571 int lwpid;
1572 char* program;
1573 char* command;
1574 };
1575
1576 /* Extra tdata information held for output ELF BFDs. */
1577 struct output_elf_obj_tdata
1578 {
1579 struct elf_segment_map *seg_map;
1580 struct elf_strtab_hash *strtab_ptr;
1581
1582 /* STT_SECTION symbols for each section */
1583 asymbol **section_syms;
1584
1585 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1586 created. */
1587 asection *eh_frame_hdr;
1588
1589 /* NT_GNU_BUILD_ID note type info. */
1590 struct
1591 {
1592 bfd_boolean (*after_write_object_contents) (bfd *);
1593 const char *style;
1594 asection *sec;
1595 } build_id;
1596
1597 /* Records the result of `get_program_header_size'. */
1598 bfd_size_type program_header_size;
1599
1600 /* Used when laying out sections. */
1601 file_ptr next_file_pos;
1602
1603 int num_section_syms;
1604 unsigned int shstrtab_section, strtab_section;
1605
1606 /* Segment flags for the PT_GNU_STACK segment. */
1607 unsigned int stack_flags;
1608
1609 /* This is set to TRUE if the object was created by the backend
1610 linker. */
1611 bfd_boolean linker;
1612
1613 /* Used to determine if the e_flags field has been initialized */
1614 bfd_boolean flags_init;
1615 };
1616
1617 /* Some private data is stashed away for future use using the tdata pointer
1618 in the bfd structure. */
1619
1620 struct elf_obj_tdata
1621 {
1622 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1623 Elf_Internal_Shdr **elf_sect_ptr;
1624 Elf_Internal_Phdr *phdr;
1625 Elf_Internal_Shdr symtab_hdr;
1626 Elf_Internal_Shdr shstrtab_hdr;
1627 Elf_Internal_Shdr strtab_hdr;
1628 Elf_Internal_Shdr dynsymtab_hdr;
1629 Elf_Internal_Shdr dynstrtab_hdr;
1630 Elf_Internal_Shdr dynversym_hdr;
1631 Elf_Internal_Shdr dynverref_hdr;
1632 Elf_Internal_Shdr dynverdef_hdr;
1633 Elf_Internal_Shdr symtab_shndx_hdr;
1634 bfd_vma gp; /* The gp value */
1635 unsigned int gp_size; /* The gp size */
1636 unsigned int num_elf_sections; /* elf_sect_ptr size */
1637
1638 /* A mapping from external symbols to entries in the linker hash
1639 table, used when linking. This is indexed by the symbol index
1640 minus the sh_info field of the symbol table header. */
1641 struct elf_link_hash_entry **sym_hashes;
1642
1643 /* Track usage and final offsets of GOT entries for local symbols.
1644 This array is indexed by symbol index. Elements are used
1645 identically to "got" in struct elf_link_hash_entry. */
1646 union
1647 {
1648 bfd_signed_vma *refcounts;
1649 bfd_vma *offsets;
1650 struct got_entry **ents;
1651 } local_got;
1652
1653 /* The linker ELF emulation code needs to let the backend ELF linker
1654 know what filename should be used for a dynamic object if the
1655 dynamic object is found using a search. The emulation code then
1656 sometimes needs to know what name was actually used. Until the
1657 file has been added to the linker symbol table, this field holds
1658 the name the linker wants. After it has been added, it holds the
1659 name actually used, which will be the DT_SONAME entry if there is
1660 one. */
1661 const char *dt_name;
1662
1663 /* The linker emulation needs to know what audit libs
1664 are used by a dynamic object. */
1665 const char *dt_audit;
1666
1667 /* Used by find_nearest_line entry point. */
1668 void *line_info;
1669
1670 /* A place to stash dwarf1 info for this bfd. */
1671 struct dwarf1_debug *dwarf1_find_line_info;
1672
1673 /* A place to stash dwarf2 info for this bfd. */
1674 void *dwarf2_find_line_info;
1675
1676 /* Stash away info for yet another find line/function variant. */
1677 void *elf_find_function_cache;
1678
1679 /* Number of symbol version definitions we are about to emit. */
1680 unsigned int cverdefs;
1681
1682 /* Number of symbol version references we are about to emit. */
1683 unsigned int cverrefs;
1684
1685 /* Symbol version definitions in external objects. */
1686 Elf_Internal_Verdef *verdef;
1687
1688 /* Symbol version references to external objects. */
1689 Elf_Internal_Verneed *verref;
1690
1691 /* A pointer to the .eh_frame section. */
1692 asection *eh_frame_section;
1693
1694 /* Symbol buffer. */
1695 void *symbuf;
1696
1697 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1698 obj_attribute_list *other_obj_attributes[2];
1699
1700 /* Linked-list containing information about every Systemtap section
1701 found in the object file. Each section corresponds to one entry
1702 in the list. */
1703 struct sdt_note *sdt_note_head;
1704
1705 Elf_Internal_Shdr **group_sect_ptr;
1706 int num_group;
1707
1708 unsigned int symtab_section, symtab_shndx_section, dynsymtab_section;
1709 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1710
1711 /* An identifier used to distinguish different target
1712 specific extensions to this structure. */
1713 enum elf_target_id object_id;
1714
1715 /* Whether a dyanmic object was specified normally on the linker
1716 command line, or was specified when --as-needed was in effect,
1717 or was found via a DT_NEEDED entry. */
1718 enum dynamic_lib_link_class dyn_lib_class;
1719
1720 /* Irix 5 often screws up the symbol table, sorting local symbols
1721 after global symbols. This flag is set if the symbol table in
1722 this BFD appears to be screwed up. If it is, we ignore the
1723 sh_info field in the symbol table header, and always read all the
1724 symbols. */
1725 bfd_boolean bad_symtab;
1726
1727 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1728 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1729 field in the ELF header structure. */
1730 bfd_boolean has_gnu_symbols;
1731
1732 /* Information grabbed from an elf core file. */
1733 struct core_elf_obj_tdata *core;
1734
1735 /* More information held for output ELF BFDs. */
1736 struct output_elf_obj_tdata *o;
1737 };
1738
1739 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1740
1741 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1742 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1743 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1744 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1745 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1746 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1747 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1748 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1749 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1750 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1751 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1752 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1753 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1754 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1755 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1756 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1757 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1758 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1759 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1760 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1761 #define elf_eh_frame_section(bfd) \
1762 (elf_tdata(bfd) -> eh_frame_section)
1763 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1764 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1765 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1766 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1767 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1768 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1769 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1770 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1771 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1772 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1773 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1774 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1775 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1776 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1777 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1778 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1779 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1780 #define elf_known_obj_attributes_proc(bfd) \
1781 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1782 #define elf_other_obj_attributes_proc(bfd) \
1783 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1784 \f
1785 extern void _bfd_elf_swap_verdef_in
1786 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1787 extern void _bfd_elf_swap_verdef_out
1788 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1789 extern void _bfd_elf_swap_verdaux_in
1790 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1791 extern void _bfd_elf_swap_verdaux_out
1792 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1793 extern void _bfd_elf_swap_verneed_in
1794 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1795 extern void _bfd_elf_swap_verneed_out
1796 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1797 extern void _bfd_elf_swap_vernaux_in
1798 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1799 extern void _bfd_elf_swap_vernaux_out
1800 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1801 extern void _bfd_elf_swap_versym_in
1802 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1803 extern void _bfd_elf_swap_versym_out
1804 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1805
1806 extern unsigned int _bfd_elf_section_from_bfd_section
1807 (bfd *, asection *);
1808 extern char *bfd_elf_string_from_elf_section
1809 (bfd *, unsigned, unsigned);
1810 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1811 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1812 Elf_External_Sym_Shndx *);
1813 extern const char *bfd_elf_sym_name
1814 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1815
1816 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1817 (bfd *, bfd *);
1818 extern bfd_boolean _bfd_elf_print_private_bfd_data
1819 (bfd *, void *);
1820 const char * _bfd_elf_get_symbol_version_string
1821 (bfd *, asymbol *, bfd_boolean *);
1822 extern void bfd_elf_print_symbol
1823 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1824
1825 extern unsigned int _bfd_elf_eh_frame_address_size
1826 (bfd *, asection *);
1827 extern bfd_byte _bfd_elf_encode_eh_address
1828 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1829 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1830 extern bfd_boolean _bfd_elf_can_make_relative
1831 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1832
1833 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1834 (const struct bfd_link_info *, const asection *,
1835 const Elf_Internal_Rela *);
1836 extern bfd_vma _bfd_elf_rela_local_sym
1837 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1838 extern bfd_vma _bfd_elf_rel_local_sym
1839 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1840 extern bfd_vma _bfd_elf_section_offset
1841 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1842
1843 extern unsigned long bfd_elf_hash
1844 (const char *);
1845 extern unsigned long bfd_elf_gnu_hash
1846 (const char *);
1847
1848 extern bfd_reloc_status_type bfd_elf_generic_reloc
1849 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1850 extern bfd_boolean bfd_elf_allocate_object
1851 (bfd *, size_t, enum elf_target_id);
1852 extern bfd_boolean bfd_elf_make_object
1853 (bfd *);
1854 extern bfd_boolean bfd_elf_mkcorefile
1855 (bfd *);
1856 extern bfd_boolean _bfd_elf_make_section_from_shdr
1857 (bfd *, Elf_Internal_Shdr *, const char *, int);
1858 extern bfd_boolean _bfd_elf_make_section_from_phdr
1859 (bfd *, Elf_Internal_Phdr *, int, const char *);
1860 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1861 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1862 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1863 (bfd *);
1864 extern void _bfd_elf_link_hash_table_free
1865 (bfd *);
1866 extern void _bfd_elf_link_hash_copy_indirect
1867 (struct bfd_link_info *, struct elf_link_hash_entry *,
1868 struct elf_link_hash_entry *);
1869 extern void _bfd_elf_link_hash_hide_symbol
1870 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1871 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1872 (struct bfd_link_info *, struct elf_link_hash_entry *);
1873 extern bfd_boolean _bfd_elf_link_hash_table_init
1874 (struct elf_link_hash_table *, bfd *,
1875 struct bfd_hash_entry *(*)
1876 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1877 unsigned int, enum elf_target_id);
1878 extern bfd_boolean _bfd_elf_slurp_version_tables
1879 (bfd *, bfd_boolean);
1880 extern bfd_boolean _bfd_elf_merge_sections
1881 (bfd *, struct bfd_link_info *);
1882 extern bfd_boolean _bfd_elf_match_sections_by_type
1883 (bfd *, const asection *, bfd *, const asection *);
1884 extern bfd_boolean bfd_elf_is_group_section
1885 (bfd *, const struct bfd_section *);
1886 extern bfd_boolean _bfd_elf_section_already_linked
1887 (bfd *, asection *, struct bfd_link_info *);
1888 extern void bfd_elf_set_group_contents
1889 (bfd *, asection *, void *);
1890 extern asection *_bfd_elf_check_kept_section
1891 (asection *, struct bfd_link_info *);
1892 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1893 extern void _bfd_elf_copy_link_hash_symbol_type
1894 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1895 extern bfd_boolean _bfd_elf_size_group_sections
1896 (struct bfd_link_info *);
1897 extern bfd_boolean _bfd_elf_fixup_group_sections
1898 (bfd *, asection *);
1899 extern bfd_boolean _bfd_elf_copy_private_header_data
1900 (bfd *, bfd *);
1901 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1902 (bfd *, asymbol *, bfd *, asymbol *);
1903 #define _bfd_generic_init_private_section_data \
1904 _bfd_elf_init_private_section_data
1905 extern bfd_boolean _bfd_elf_init_private_section_data
1906 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1907 extern bfd_boolean _bfd_elf_copy_private_section_data
1908 (bfd *, asection *, bfd *, asection *);
1909 extern bfd_boolean _bfd_elf_write_object_contents
1910 (bfd *);
1911 extern bfd_boolean _bfd_elf_write_corefile_contents
1912 (bfd *);
1913 extern bfd_boolean _bfd_elf_set_section_contents
1914 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1915 extern long _bfd_elf_get_symtab_upper_bound
1916 (bfd *);
1917 extern long _bfd_elf_canonicalize_symtab
1918 (bfd *, asymbol **);
1919 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1920 (bfd *);
1921 extern long _bfd_elf_canonicalize_dynamic_symtab
1922 (bfd *, asymbol **);
1923 extern long _bfd_elf_get_synthetic_symtab
1924 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1925 extern long _bfd_elf_get_reloc_upper_bound
1926 (bfd *, sec_ptr);
1927 extern long _bfd_elf_canonicalize_reloc
1928 (bfd *, sec_ptr, arelent **, asymbol **);
1929 extern asection * _bfd_elf_get_dynamic_reloc_section
1930 (bfd *, asection *, bfd_boolean);
1931 extern asection * _bfd_elf_make_dynamic_reloc_section
1932 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1933 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1934 (bfd *);
1935 extern long _bfd_elf_canonicalize_dynamic_reloc
1936 (bfd *, arelent **, asymbol **);
1937 extern asymbol *_bfd_elf_make_empty_symbol
1938 (bfd *);
1939 extern void _bfd_elf_get_symbol_info
1940 (bfd *, asymbol *, symbol_info *);
1941 extern bfd_boolean _bfd_elf_is_local_label_name
1942 (bfd *, const char *);
1943 extern alent *_bfd_elf_get_lineno
1944 (bfd *, asymbol *);
1945 extern bfd_boolean _bfd_elf_set_arch_mach
1946 (bfd *, enum bfd_architecture, unsigned long);
1947 extern bfd_boolean _bfd_elf_find_nearest_line
1948 (bfd *, asymbol **, asection *, bfd_vma,
1949 const char **, const char **, unsigned int *, unsigned int *);
1950 extern bfd_boolean _bfd_elf_find_line
1951 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1952 extern bfd_boolean _bfd_elf_find_inliner_info
1953 (bfd *, const char **, const char **, unsigned int *);
1954 extern bfd_boolean _bfd_elf_find_function
1955 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
1956 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1957 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1958 extern int _bfd_elf_sizeof_headers
1959 (bfd *, struct bfd_link_info *);
1960 extern bfd_boolean _bfd_elf_new_section_hook
1961 (bfd *, asection *);
1962 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1963 (const char *, const struct bfd_elf_special_section *, unsigned int);
1964 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1965 (bfd *, asection *);
1966
1967 /* If the target doesn't have reloc handling written yet: */
1968 extern void _bfd_elf_no_info_to_howto
1969 (bfd *, arelent *, Elf_Internal_Rela *);
1970
1971 extern bfd_boolean bfd_section_from_shdr
1972 (bfd *, unsigned int shindex);
1973 extern bfd_boolean bfd_section_from_phdr
1974 (bfd *, Elf_Internal_Phdr *, int);
1975
1976 extern int _bfd_elf_symbol_from_bfd_symbol
1977 (bfd *, asymbol **);
1978
1979 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1980 (struct sym_cache *, bfd *, unsigned long);
1981 extern asection *bfd_section_from_elf_index
1982 (bfd *, unsigned int);
1983 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1984 (void);
1985
1986 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1987 (void);
1988 extern void _bfd_elf_strtab_free
1989 (struct elf_strtab_hash *);
1990 extern bfd_size_type _bfd_elf_strtab_add
1991 (struct elf_strtab_hash *, const char *, bfd_boolean);
1992 extern void _bfd_elf_strtab_addref
1993 (struct elf_strtab_hash *, bfd_size_type);
1994 extern void _bfd_elf_strtab_delref
1995 (struct elf_strtab_hash *, bfd_size_type);
1996 extern unsigned int _bfd_elf_strtab_refcount
1997 (struct elf_strtab_hash *, bfd_size_type);
1998 extern void _bfd_elf_strtab_clear_all_refs
1999 (struct elf_strtab_hash *tab);
2000 extern void _bfd_elf_strtab_restore_size
2001 (struct elf_strtab_hash *, bfd_size_type);
2002 extern bfd_size_type _bfd_elf_strtab_size
2003 (struct elf_strtab_hash *);
2004 extern bfd_size_type _bfd_elf_strtab_offset
2005 (struct elf_strtab_hash *, bfd_size_type);
2006 extern bfd_boolean _bfd_elf_strtab_emit
2007 (bfd *, struct elf_strtab_hash *);
2008 extern void _bfd_elf_strtab_finalize
2009 (struct elf_strtab_hash *);
2010
2011 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2012 (bfd *, struct bfd_link_info *);
2013 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2014 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2015 extern void _bfd_elf_parse_eh_frame
2016 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2017 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2018 (struct bfd_link_info *info);
2019
2020 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2021 (bfd *, struct bfd_link_info *, asection *,
2022 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2023 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2024 (bfd *, struct bfd_link_info *);
2025 extern bfd_vma _bfd_elf_eh_frame_section_offset
2026 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2027 extern bfd_boolean _bfd_elf_write_section_eh_frame
2028 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2029 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2030 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2031 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2032 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2033 (bfd *, struct bfd_link_info *);
2034 extern bfd_boolean _bfd_elf_eh_frame_present
2035 (struct bfd_link_info *);
2036 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2037 (struct bfd_link_info *);
2038 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2039 (struct bfd_link_info *);
2040
2041 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2042
2043 extern long _bfd_elf_link_lookup_local_dynindx
2044 (struct bfd_link_info *, bfd *, long);
2045 extern bfd_boolean _bfd_elf_compute_section_file_positions
2046 (bfd *, struct bfd_link_info *);
2047 extern file_ptr _bfd_elf_assign_file_position_for_section
2048 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2049
2050 extern bfd_boolean _bfd_elf_validate_reloc
2051 (bfd *, arelent *);
2052
2053 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2054 (bfd *, struct bfd_link_info *);
2055 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2056 (bfd *, struct bfd_link_info *, asection *);
2057 extern bfd_boolean _bfd_elf_create_dynamic_sections
2058 (bfd *, struct bfd_link_info *);
2059 extern bfd_boolean _bfd_elf_create_got_section
2060 (bfd *, struct bfd_link_info *);
2061 extern asection *_bfd_elf_section_for_symbol
2062 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2063 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2064 (bfd *, struct bfd_link_info *, asection *, const char *);
2065 extern void _bfd_elf_init_1_index_section
2066 (bfd *, struct bfd_link_info *);
2067 extern void _bfd_elf_init_2_index_sections
2068 (bfd *, struct bfd_link_info *);
2069
2070 extern bfd_boolean _bfd_elfcore_make_pseudosection
2071 (bfd *, char *, size_t, ufile_ptr);
2072 extern char *_bfd_elfcore_strndup
2073 (bfd *, char *, size_t);
2074
2075 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2076 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2077
2078 extern bfd_boolean _bfd_elf_link_output_relocs
2079 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2080 struct elf_link_hash_entry **);
2081
2082 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2083 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2084
2085 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2086 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2087
2088 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2089 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2090
2091 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2092 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2093
2094 extern bfd_boolean _bfd_elf_setup_sections
2095 (bfd *);
2096
2097 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2098
2099 extern const bfd_target *bfd_elf32_object_p
2100 (bfd *);
2101 extern const bfd_target *bfd_elf32_core_file_p
2102 (bfd *);
2103 extern char *bfd_elf32_core_file_failing_command
2104 (bfd *);
2105 extern int bfd_elf32_core_file_failing_signal
2106 (bfd *);
2107 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2108 (bfd *, bfd *);
2109 extern int bfd_elf32_core_file_pid
2110 (bfd *);
2111
2112 extern bfd_boolean bfd_elf32_swap_symbol_in
2113 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2114 extern void bfd_elf32_swap_symbol_out
2115 (bfd *, const Elf_Internal_Sym *, void *, void *);
2116 extern void bfd_elf32_swap_reloc_in
2117 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2118 extern void bfd_elf32_swap_reloc_out
2119 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2120 extern void bfd_elf32_swap_reloca_in
2121 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2122 extern void bfd_elf32_swap_reloca_out
2123 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2124 extern void bfd_elf32_swap_phdr_in
2125 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2126 extern void bfd_elf32_swap_phdr_out
2127 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2128 extern void bfd_elf32_swap_dyn_in
2129 (bfd *, const void *, Elf_Internal_Dyn *);
2130 extern void bfd_elf32_swap_dyn_out
2131 (bfd *, const Elf_Internal_Dyn *, void *);
2132 extern long bfd_elf32_slurp_symbol_table
2133 (bfd *, asymbol **, bfd_boolean);
2134 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2135 (bfd *);
2136 extern int bfd_elf32_write_out_phdrs
2137 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2138 extern bfd_boolean bfd_elf32_checksum_contents
2139 (bfd * , void (*) (const void *, size_t, void *), void *);
2140 extern void bfd_elf32_write_relocs
2141 (bfd *, asection *, void *);
2142 extern bfd_boolean bfd_elf32_slurp_reloc_table
2143 (bfd *, asection *, asymbol **, bfd_boolean);
2144
2145 extern const bfd_target *bfd_elf64_object_p
2146 (bfd *);
2147 extern const bfd_target *bfd_elf64_core_file_p
2148 (bfd *);
2149 extern char *bfd_elf64_core_file_failing_command
2150 (bfd *);
2151 extern int bfd_elf64_core_file_failing_signal
2152 (bfd *);
2153 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2154 (bfd *, bfd *);
2155 extern int bfd_elf64_core_file_pid
2156 (bfd *);
2157
2158 extern bfd_boolean bfd_elf64_swap_symbol_in
2159 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2160 extern void bfd_elf64_swap_symbol_out
2161 (bfd *, const Elf_Internal_Sym *, void *, void *);
2162 extern void bfd_elf64_swap_reloc_in
2163 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2164 extern void bfd_elf64_swap_reloc_out
2165 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2166 extern void bfd_elf64_swap_reloca_in
2167 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2168 extern void bfd_elf64_swap_reloca_out
2169 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2170 extern void bfd_elf64_swap_phdr_in
2171 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2172 extern void bfd_elf64_swap_phdr_out
2173 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2174 extern void bfd_elf64_swap_dyn_in
2175 (bfd *, const void *, Elf_Internal_Dyn *);
2176 extern void bfd_elf64_swap_dyn_out
2177 (bfd *, const Elf_Internal_Dyn *, void *);
2178 extern long bfd_elf64_slurp_symbol_table
2179 (bfd *, asymbol **, bfd_boolean);
2180 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2181 (bfd *);
2182 extern int bfd_elf64_write_out_phdrs
2183 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2184 extern bfd_boolean bfd_elf64_checksum_contents
2185 (bfd * , void (*) (const void *, size_t, void *), void *);
2186 extern void bfd_elf64_write_relocs
2187 (bfd *, asection *, void *);
2188 extern bfd_boolean bfd_elf64_slurp_reloc_table
2189 (bfd *, asection *, asymbol **, bfd_boolean);
2190
2191 extern bfd_boolean _bfd_elf_default_relocs_compatible
2192 (const bfd_target *, const bfd_target *);
2193
2194 extern bfd_boolean _bfd_elf_relocs_compatible
2195 (const bfd_target *, const bfd_target *);
2196 extern bfd_boolean _bfd_elf_notice_as_needed
2197 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2198
2199 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2200 (bfd *, struct bfd_link_info *, const char *);
2201 extern bfd_boolean bfd_elf_link_add_symbols
2202 (bfd *, struct bfd_link_info *);
2203 extern bfd_boolean _bfd_elf_add_dynamic_entry
2204 (struct bfd_link_info *, bfd_vma, bfd_vma);
2205
2206 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2207 (struct bfd_link_info *, struct elf_link_hash_entry *);
2208
2209 extern int bfd_elf_link_record_local_dynamic_symbol
2210 (struct bfd_link_info *, bfd *, long);
2211
2212 extern bfd_boolean _bfd_elf_close_and_cleanup
2213 (bfd *);
2214
2215 extern bfd_boolean _bfd_elf_common_definition
2216 (Elf_Internal_Sym *);
2217
2218 extern unsigned int _bfd_elf_common_section_index
2219 (asection *);
2220
2221 extern asection *_bfd_elf_common_section
2222 (asection *);
2223
2224 extern bfd_vma _bfd_elf_default_got_elt_size
2225 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2226 unsigned long);
2227
2228 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2229 (bfd *, arelent *, struct bfd_symbol *, void *,
2230 asection *, bfd *, char **);
2231
2232 extern bfd_boolean bfd_elf_final_link
2233 (bfd *, struct bfd_link_info *);
2234
2235 extern void _bfd_elf_gc_keep
2236 (struct bfd_link_info *info);
2237
2238 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2239 (struct elf_link_hash_entry *h, void *inf);
2240
2241 extern bfd_boolean bfd_elf_gc_sections
2242 (bfd *, struct bfd_link_info *);
2243
2244 extern bfd_boolean bfd_elf_gc_record_vtinherit
2245 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2246
2247 extern bfd_boolean bfd_elf_gc_record_vtentry
2248 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2249
2250 extern asection *_bfd_elf_gc_mark_hook
2251 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2252 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2253
2254 extern asection *_bfd_elf_gc_mark_rsec
2255 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2256 struct elf_reloc_cookie *);
2257
2258 extern bfd_boolean _bfd_elf_gc_mark_reloc
2259 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2260 struct elf_reloc_cookie *);
2261
2262 extern bfd_boolean _bfd_elf_gc_mark_fdes
2263 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2264 struct elf_reloc_cookie *);
2265
2266 extern bfd_boolean _bfd_elf_gc_mark
2267 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2268
2269 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2270 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2271
2272 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2273 (bfd *, struct bfd_link_info *);
2274
2275 extern bfd_boolean bfd_elf_gc_common_final_link
2276 (bfd *, struct bfd_link_info *);
2277
2278 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2279 (bfd_vma, void *);
2280
2281 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2282 (bfd *, asection *);
2283
2284 extern bfd_boolean _bfd_elf_map_sections_to_segments
2285 (bfd *, struct bfd_link_info *);
2286
2287 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2288
2289 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2290 bfd_vma *);
2291
2292 extern asection *_bfd_elf_get_reloc_section (asection *);
2293
2294 extern int bfd_elf_get_default_section_type (flagword);
2295
2296 extern bfd_boolean bfd_elf_lookup_section_flags
2297 (struct bfd_link_info *, struct flag_info *, asection *);
2298
2299 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2300 (bfd * abfd, asection * section);
2301
2302 /* Exported interface for writing elf corefile notes. */
2303 extern char *elfcore_write_note
2304 (bfd *, char *, int *, const char *, int, const void *, int);
2305 extern char *elfcore_write_prpsinfo
2306 (bfd *, char *, int *, const char *, const char *);
2307 extern char *elfcore_write_prstatus
2308 (bfd *, char *, int *, long, int, const void *);
2309 extern char * elfcore_write_pstatus
2310 (bfd *, char *, int *, long, int, const void *);
2311 extern char *elfcore_write_prfpreg
2312 (bfd *, char *, int *, const void *, int);
2313 extern char *elfcore_write_prxfpreg
2314 (bfd *, char *, int *, const void *, int);
2315 extern char *elfcore_write_xstatereg
2316 (bfd *, char *, int *, const void *, int);
2317 extern char *elfcore_write_ppc_vmx
2318 (bfd *, char *, int *, const void *, int);
2319 extern char *elfcore_write_ppc_vsx
2320 (bfd *, char *, int *, const void *, int);
2321 extern char *elfcore_write_s390_timer
2322 (bfd *, char *, int *, const void *, int);
2323 extern char *elfcore_write_s390_todcmp
2324 (bfd *, char *, int *, const void *, int);
2325 extern char *elfcore_write_s390_todpreg
2326 (bfd *, char *, int *, const void *, int);
2327 extern char *elfcore_write_s390_ctrs
2328 (bfd *, char *, int *, const void *, int);
2329 extern char *elfcore_write_s390_prefix
2330 (bfd *, char *, int *, const void *, int);
2331 extern char *elfcore_write_s390_last_break
2332 (bfd *, char *, int *, const void *, int);
2333 extern char *elfcore_write_s390_system_call
2334 (bfd *, char *, int *, const void *, int);
2335 extern char *elfcore_write_s390_tdb
2336 (bfd *, char *, int *, const void *, int);
2337 extern char *elfcore_write_s390_vxrs_low
2338 (bfd *, char *, int *, const void *, int);
2339 extern char *elfcore_write_s390_vxrs_high
2340 (bfd *, char *, int *, const void *, int);
2341 extern char *elfcore_write_arm_vfp
2342 (bfd *, char *, int *, const void *, int);
2343 extern char *elfcore_write_aarch_tls
2344 (bfd *, char *, int *, const void *, int);
2345 extern char *elfcore_write_aarch_hw_break
2346 (bfd *, char *, int *, const void *, int);
2347 extern char *elfcore_write_aarch_hw_watch
2348 (bfd *, char *, int *, const void *, int);
2349 extern char *elfcore_write_lwpstatus
2350 (bfd *, char *, int *, long, int, const void *);
2351 extern char *elfcore_write_register_note
2352 (bfd *, char *, int *, const char *, const void *, int);
2353
2354 /* Internal structure which holds information to be included in the
2355 PRPSINFO section of Linux core files.
2356
2357 This is an "internal" structure in the sense that it should be used
2358 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2359 function), so things like endianess shouldn't be an issue. This
2360 structure will eventually be converted in one of the
2361 `elf_external_linux_*' structures and written out to an output bfd
2362 by one of the functions declared below. */
2363
2364 struct elf_internal_linux_prpsinfo
2365 {
2366 char pr_state; /* Numeric process state. */
2367 char pr_sname; /* Char for pr_state. */
2368 char pr_zomb; /* Zombie. */
2369 char pr_nice; /* Nice val. */
2370 unsigned long pr_flag; /* Flags. */
2371 unsigned int pr_uid;
2372 unsigned int pr_gid;
2373 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2374 char pr_fname[16 + 1]; /* Filename of executable. */
2375 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2376 };
2377
2378 /* Linux/most 32-bit archs. */
2379 extern char *elfcore_write_linux_prpsinfo32
2380 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2381
2382 /* Linux/most 64-bit archs. */
2383 extern char *elfcore_write_linux_prpsinfo64
2384 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2385
2386 /* Linux/PPC32 uses different layout compared to most archs. */
2387 extern char *elfcore_write_ppc_linux_prpsinfo32
2388 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2389
2390 extern bfd *_bfd_elf32_bfd_from_remote_memory
2391 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2392 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2393 extern bfd *_bfd_elf64_bfd_from_remote_memory
2394 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2395 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2396
2397 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2398 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2399 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2400 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2401 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2402 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2403 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2404 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2405 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2406 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2407 const char *);
2408 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2409 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2410 (INTVAL), (STRVAL))
2411
2412 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2413 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2414 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2415 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2416 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2417 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2418 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2419 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2420
2421 /* The linker may need to keep track of the number of relocs that it
2422 decides to copy as dynamic relocs in check_relocs for each symbol.
2423 This is so that it can later discard them if they are found to be
2424 unnecessary. We can store the information in a field extending the
2425 regular ELF linker hash table. */
2426
2427 struct elf_dyn_relocs
2428 {
2429 struct elf_dyn_relocs *next;
2430
2431 /* The input section of the reloc. */
2432 asection *sec;
2433
2434 /* Total number of relocs copied for the input section. */
2435 bfd_size_type count;
2436
2437 /* Number of pc-relative relocs copied for the input section. */
2438 bfd_size_type pc_count;
2439 };
2440
2441 extern bfd_boolean _bfd_elf_create_ifunc_sections
2442 (bfd *, struct bfd_link_info *);
2443 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2444 (struct bfd_link_info *, struct elf_link_hash_entry *,
2445 struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int);
2446 extern long _bfd_elf_ifunc_get_synthetic_symtab
2447 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
2448 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
2449
2450 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2451 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2452
2453 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2454 extern bfd_vma elf64_r_sym (bfd_vma);
2455 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2456 extern bfd_vma elf32_r_sym (bfd_vma);
2457
2458 /* Large common section. */
2459 extern asection _bfd_elf_large_com_section;
2460
2461 /* Hash for local symbol with the first section id, ID, in the input
2462 file and the local symbol index, SYM. */
2463 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2464 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2465 ^ (SYM) ^ ((ID) >> 16))
2466
2467 /* This is the condition under which finish_dynamic_symbol will be called.
2468 If our finish_dynamic_symbol isn't called, we'll need to do something
2469 about initializing any .plt and .got entries in relocate_section. */
2470 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2471 ((DYN) \
2472 && ((SHARED) || !(H)->forced_local) \
2473 && ((H)->dynindx != -1 || (H)->forced_local))
2474
2475 /* This macro is to avoid lots of duplicated code in the body
2476 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2477 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2478 r_symndx, symtab_hdr, sym_hashes, \
2479 h, sec, relocation, \
2480 unresolved_reloc, warned, ignored) \
2481 do \
2482 { \
2483 /* It seems this can happen with erroneous or unsupported \
2484 input (mixing a.out and elf in an archive, for example.) */ \
2485 if (sym_hashes == NULL) \
2486 return FALSE; \
2487 \
2488 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2489 \
2490 if (info->wrap_hash != NULL \
2491 && (input_section->flags & SEC_DEBUGGING) != 0) \
2492 h = ((struct elf_link_hash_entry *) \
2493 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2494 \
2495 while (h->root.type == bfd_link_hash_indirect \
2496 || h->root.type == bfd_link_hash_warning) \
2497 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2498 \
2499 warned = FALSE; \
2500 ignored = FALSE; \
2501 unresolved_reloc = FALSE; \
2502 relocation = 0; \
2503 if (h->root.type == bfd_link_hash_defined \
2504 || h->root.type == bfd_link_hash_defweak) \
2505 { \
2506 sec = h->root.u.def.section; \
2507 if (sec == NULL \
2508 || sec->output_section == NULL) \
2509 /* Set a flag that will be cleared later if we find a \
2510 relocation value for this symbol. output_section \
2511 is typically NULL for symbols satisfied by a shared \
2512 library. */ \
2513 unresolved_reloc = TRUE; \
2514 else \
2515 relocation = (h->root.u.def.value \
2516 + sec->output_section->vma \
2517 + sec->output_offset); \
2518 } \
2519 else if (h->root.type == bfd_link_hash_undefweak) \
2520 ; \
2521 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2522 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2523 ignored = TRUE; \
2524 else if (!info->relocatable) \
2525 { \
2526 bfd_boolean err; \
2527 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2528 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2529 if (!info->callbacks->undefined_symbol (info, \
2530 h->root.root.string, \
2531 input_bfd, \
2532 input_section, \
2533 rel->r_offset, err)) \
2534 return FALSE; \
2535 warned = TRUE; \
2536 } \
2537 (void) unresolved_reloc; \
2538 (void) warned; \
2539 (void) ignored; \
2540 } \
2541 while (0)
2542
2543 /* This macro is to avoid lots of duplicated code in the body of the
2544 loop over relocations in xxx_relocate_section() in the various
2545 elfxx-xxxx.c files.
2546
2547 Handle relocations against symbols from removed linkonce sections,
2548 or sections discarded by a linker script. When doing a relocatable
2549 link, we remove such relocations. Otherwise, we just want the
2550 section contents zeroed and avoid any special processing. */
2551 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2552 rel, count, relend, \
2553 howto, index, contents) \
2554 { \
2555 int i_; \
2556 _bfd_clear_contents (howto, input_bfd, input_section, \
2557 contents + rel[index].r_offset); \
2558 \
2559 if (info->relocatable \
2560 && (input_section->flags & SEC_DEBUGGING)) \
2561 { \
2562 /* Only remove relocations in debug sections since other \
2563 sections may require relocations. */ \
2564 Elf_Internal_Shdr *rel_hdr; \
2565 \
2566 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2567 \
2568 /* Avoid empty output section. */ \
2569 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2570 { \
2571 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2572 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2573 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2574 \
2575 memmove (rel, rel + count, \
2576 (relend - rel - count) * sizeof (*rel)); \
2577 \
2578 input_section->reloc_count--; \
2579 relend -= count; \
2580 rel--; \
2581 continue; \
2582 } \
2583 } \
2584 \
2585 for (i_ = 0; i_ < count; i_++) \
2586 { \
2587 rel[i_].r_info = 0; \
2588 rel[i_].r_addend = 0; \
2589 } \
2590 rel += count - 1; \
2591 continue; \
2592 }
2593
2594 /* Will a symbol be bound to the definition within the shared
2595 library, if any. A unique symbol can never be bound locally. */
2596 #define SYMBOLIC_BIND(INFO, H) \
2597 (!(H)->unique_global \
2598 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2599
2600 #ifdef __cplusplus
2601 }
2602 #endif
2603 #endif /* _LIBELF_H_ */
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