* elf-eh-frame.c (struct cie): New type.
[deliverable/binutils-gdb.git] / bfd / elf-bfd.h
1 /* BFD back-end data structures for ELF files.
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
4 Written by Cygnus Support.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
21
22 #ifndef _LIBELF_H_
23 #define _LIBELF_H_ 1
24
25 #include "elf/common.h"
26 #include "elf/internal.h"
27 #include "elf/external.h"
28 #include "bfdlink.h"
29
30 /* The number of entries in a section is its size divided by the size
31 of a single entry. This is normally only applicable to reloc and
32 symbol table sections. */
33 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize)
34
35 /* If size isn't specified as 64 or 32, NAME macro should fail. */
36 #ifndef NAME
37 #if ARCH_SIZE == 64
38 #define NAME(x, y) x ## 64 ## _ ## y
39 #endif
40 #if ARCH_SIZE == 32
41 #define NAME(x, y) x ## 32 ## _ ## y
42 #endif
43 #endif
44
45 #ifndef NAME
46 #define NAME(x, y) x ## NOSIZE ## _ ## y
47 #endif
48
49 #define ElfNAME(X) NAME(Elf,X)
50 #define elfNAME(X) NAME(elf,X)
51
52 /* Information held for an ELF symbol. The first field is the
53 corresponding asymbol. Every symbol is an ELF file is actually a
54 pointer to this structure, although it is often handled as a
55 pointer to an asymbol. */
56
57 typedef struct
58 {
59 /* The BFD symbol. */
60 asymbol symbol;
61 /* ELF symbol information. */
62 Elf_Internal_Sym internal_elf_sym;
63 /* Backend specific information. */
64 union
65 {
66 unsigned int hppa_arg_reloc;
67 void *mips_extr;
68 void *any;
69 }
70 tc_data;
71
72 /* Version information. This is from an Elf_Internal_Versym
73 structure in a SHT_GNU_versym section. It is zero if there is no
74 version information. */
75 unsigned short version;
76
77 } elf_symbol_type;
78 \f
79 struct elf_strtab_hash;
80 struct got_entry;
81 struct plt_entry;
82
83 /* ELF linker hash table entries. */
84
85 struct elf_link_hash_entry
86 {
87 struct bfd_link_hash_entry root;
88
89 /* Symbol index in output file. This is initialized to -1. It is
90 set to -2 if the symbol is used by a reloc. */
91 long indx;
92
93 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
94 -1 if this is not a dynamic symbol. */
95 /* ??? Note that this is consistently used as a synonym for tests
96 against whether we can perform various simplifying transformations
97 to the code. (E.g. changing a pc-relative jump to a PLT entry
98 into a pc-relative jump to the target function.) That test, which
99 is often relatively complex, and someplaces wrong or incomplete,
100 should really be replaced by a predicate in elflink.c.
101
102 End result: this field -1 does not indicate that the symbol is
103 not in the dynamic symbol table, but rather that the symbol is
104 not visible outside this DSO. */
105 long dynindx;
106
107 /* If this symbol requires an entry in the global offset table, the
108 processor specific backend uses this field to track usage and
109 final offset. Two schemes are supported: The first assumes that
110 a symbol may only have one GOT entry, and uses REFCOUNT until
111 size_dynamic_sections, at which point the contents of the .got is
112 fixed. Afterward, if OFFSET is -1, then the symbol does not
113 require a global offset table entry. The second scheme allows
114 multiple GOT entries per symbol, managed via a linked list
115 pointed to by GLIST. */
116 union gotplt_union
117 {
118 bfd_signed_vma refcount;
119 bfd_vma offset;
120 struct got_entry *glist;
121 struct plt_entry *plist;
122 } got;
123
124 /* Same, but tracks a procedure linkage table entry. */
125 union gotplt_union plt;
126
127 /* Symbol size. */
128 bfd_size_type size;
129
130 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
131 unsigned int type : 8;
132
133 /* Symbol st_other value, symbol visibility. */
134 unsigned int other : 8;
135
136 /* Symbol is referenced by a non-shared object. */
137 unsigned int ref_regular : 1;
138 /* Symbol is defined by a non-shared object. */
139 unsigned int def_regular : 1;
140 /* Symbol is referenced by a shared object. */
141 unsigned int ref_dynamic : 1;
142 /* Symbol is defined by a shared object. */
143 unsigned int def_dynamic : 1;
144 /* Symbol has a non-weak reference from a non-shared object. */
145 unsigned int ref_regular_nonweak : 1;
146 /* Dynamic symbol has been adjustd. */
147 unsigned int dynamic_adjusted : 1;
148 /* Symbol needs a copy reloc. */
149 unsigned int needs_copy : 1;
150 /* Symbol needs a procedure linkage table entry. */
151 unsigned int needs_plt : 1;
152 /* Symbol appears in a non-ELF input file. */
153 unsigned int non_elf : 1;
154 /* Symbol should be marked as hidden in the version information. */
155 unsigned int hidden : 1;
156 /* Symbol was forced to local scope due to a version script file. */
157 unsigned int forced_local : 1;
158 /* Symbol was forced to be dynamic due to a version script file. */
159 unsigned int dynamic : 1;
160 /* Symbol was marked during garbage collection. */
161 unsigned int mark : 1;
162 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
163 not currently set by all the backends. */
164 unsigned int non_got_ref : 1;
165 /* Symbol has a definition in a shared object.
166 FIXME: There is no real need for this field if def_dynamic is never
167 cleared and all places that test def_dynamic also test def_regular. */
168 unsigned int dynamic_def : 1;
169 /* Symbol is weak in all shared objects. */
170 unsigned int dynamic_weak : 1;
171 /* Symbol is referenced with a relocation where C/C++ pointer equality
172 matters. */
173 unsigned int pointer_equality_needed : 1;
174
175 /* String table index in .dynstr if this is a dynamic symbol. */
176 unsigned long dynstr_index;
177
178 union
179 {
180 /* If this is a weak defined symbol from a dynamic object, this
181 field points to a defined symbol with the same value, if there is
182 one. Otherwise it is NULL. */
183 struct elf_link_hash_entry *weakdef;
184
185 /* Hash value of the name computed using the ELF hash function.
186 Used part way through size_dynamic_sections, after we've finished
187 with weakdefs. */
188 unsigned long elf_hash_value;
189 } u;
190
191 /* Version information. */
192 union
193 {
194 /* This field is used for a symbol which is not defined in a
195 regular object. It points to the version information read in
196 from the dynamic object. */
197 Elf_Internal_Verdef *verdef;
198 /* This field is used for a symbol which is defined in a regular
199 object. It is set up in size_dynamic_sections. It points to
200 the version information we should write out for this symbol. */
201 struct bfd_elf_version_tree *vertree;
202 } verinfo;
203
204 struct
205 {
206 /* Virtual table entry use information. This array is nominally of size
207 size/sizeof(target_void_pointer), though we have to be able to assume
208 and track a size while the symbol is still undefined. It is indexed
209 via offset/sizeof(target_void_pointer). */
210 size_t size;
211 bfd_boolean *used;
212
213 /* Virtual table derivation info. */
214 struct elf_link_hash_entry *parent;
215 } *vtable;
216 };
217
218 /* Will references to this symbol always reference the symbol
219 in this object? STV_PROTECTED is excluded from the visibility test
220 here so that function pointer comparisons work properly. Since
221 function symbols not defined in an app are set to their .plt entry,
222 it's necessary for shared libs to also reference the .plt even
223 though the symbol is really local to the shared lib. */
224 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
225 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
226
227 /* Will _calls_ to this symbol always call the version in this object? */
228 #define SYMBOL_CALLS_LOCAL(INFO, H) \
229 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
230
231 /* Common symbols that are turned into definitions don't have the
232 DEF_REGULAR flag set, so they might appear to be undefined. */
233 #define ELF_COMMON_DEF_P(H) \
234 (!(H)->def_regular \
235 && !(H)->def_dynamic \
236 && (H)->root.type == bfd_link_hash_defined)
237
238 /* Records local symbols to be emitted in the dynamic symbol table. */
239
240 struct elf_link_local_dynamic_entry
241 {
242 struct elf_link_local_dynamic_entry *next;
243
244 /* The input bfd this symbol came from. */
245 bfd *input_bfd;
246
247 /* The index of the local symbol being copied. */
248 long input_indx;
249
250 /* The index in the outgoing dynamic symbol table. */
251 long dynindx;
252
253 /* A copy of the input symbol. */
254 Elf_Internal_Sym isym;
255 };
256
257 struct elf_link_loaded_list
258 {
259 struct elf_link_loaded_list *next;
260 bfd *abfd;
261 };
262
263 /* Structures used by the eh_frame optimization code. */
264 struct eh_cie_fde
265 {
266 /* For FDEs, this points to the CIE used. */
267 struct eh_cie_fde *cie_inf;
268 unsigned int size;
269 unsigned int offset;
270 unsigned int new_offset;
271 unsigned char fde_encoding;
272 unsigned char lsda_encoding;
273 unsigned char lsda_offset;
274 unsigned int cie : 1;
275 unsigned int removed : 1;
276 unsigned int add_augmentation_size : 1;
277 unsigned int add_fde_encoding : 1;
278 unsigned int make_relative : 1;
279 unsigned int make_lsda_relative : 1;
280 unsigned int need_lsda_relative : 1;
281 unsigned int per_encoding_relative : 1;
282 unsigned int *set_loc;
283 };
284
285 struct eh_frame_sec_info
286 {
287 unsigned int count;
288 struct eh_cie_fde entry[1];
289 };
290
291 struct eh_frame_array_ent
292 {
293 bfd_vma initial_loc;
294 bfd_vma fde;
295 };
296
297 struct htab;
298
299 struct eh_frame_hdr_info
300 {
301 struct htab *cies;
302 asection *hdr_sec;
303 unsigned int fde_count, array_count;
304 struct eh_frame_array_ent *array;
305 /* TRUE if .eh_frame_hdr should contain the sorted search table.
306 We build it if we successfully read all .eh_frame input sections
307 and recognize them. */
308 bfd_boolean table;
309 bfd_boolean offsets_adjusted;
310 };
311
312 /* ELF linker hash table. */
313
314 struct elf_link_hash_table
315 {
316 struct bfd_link_hash_table root;
317
318 /* Whether we have created the special dynamic sections required
319 when linking against or generating a shared object. */
320 bfd_boolean dynamic_sections_created;
321
322 /* True if this target has relocatable executables, so needs dynamic
323 section symbols. */
324 bfd_boolean is_relocatable_executable;
325
326 /* The BFD used to hold special sections created by the linker.
327 This will be the first BFD found which requires these sections to
328 be created. */
329 bfd *dynobj;
330
331 /* The value to use when initialising got.refcount/offset and
332 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
333 the values are refcounts. Set to init_got_offset/init_plt_offset
334 in size_dynamic_sections when the values may be offsets. */
335 union gotplt_union init_got_refcount;
336 union gotplt_union init_plt_refcount;
337
338 /* The value to use for got.refcount/offset and plt.refcount/offset
339 when the values may be offsets. Normally (bfd_vma) -1. */
340 union gotplt_union init_got_offset;
341 union gotplt_union init_plt_offset;
342
343 /* The number of symbols found in the link which must be put into
344 the .dynsym section. */
345 bfd_size_type dynsymcount;
346
347 /* The string table of dynamic symbols, which becomes the .dynstr
348 section. */
349 struct elf_strtab_hash *dynstr;
350
351 /* The number of buckets in the hash table in the .hash section.
352 This is based on the number of dynamic symbols. */
353 bfd_size_type bucketcount;
354
355 /* A linked list of DT_NEEDED names found in dynamic objects
356 included in the link. */
357 struct bfd_link_needed_list *needed;
358
359 /* Sections in the output bfd that provides a section symbol
360 to be used by relocations emitted against local symbols.
361 Most targets will not use data_index_section. */
362 asection *text_index_section;
363 asection *data_index_section;
364
365 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
366 struct elf_link_hash_entry *hgot;
367
368 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
369 struct elf_link_hash_entry *hplt;
370
371 /* A pointer to information used to merge SEC_MERGE sections. */
372 void *merge_info;
373
374 /* Used to link stabs in sections. */
375 struct stab_info stab_info;
376
377 /* Used by eh_frame code when editing .eh_frame. */
378 struct eh_frame_hdr_info eh_info;
379
380 /* A linked list of local symbols to be added to .dynsym. */
381 struct elf_link_local_dynamic_entry *dynlocal;
382
383 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
384 objects included in the link. */
385 struct bfd_link_needed_list *runpath;
386
387 /* Cached first output tls section and size of PT_TLS segment. */
388 asection *tls_sec;
389 bfd_size_type tls_size;
390
391 /* A linked list of BFD's loaded in the link. */
392 struct elf_link_loaded_list *loaded;
393 };
394
395 /* Look up an entry in an ELF linker hash table. */
396
397 #define elf_link_hash_lookup(table, string, create, copy, follow) \
398 ((struct elf_link_hash_entry *) \
399 bfd_link_hash_lookup (&(table)->root, (string), (create), \
400 (copy), (follow)))
401
402 /* Traverse an ELF linker hash table. */
403
404 #define elf_link_hash_traverse(table, func, info) \
405 (bfd_link_hash_traverse \
406 (&(table)->root, \
407 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
408 (info)))
409
410 /* Get the ELF linker hash table from a link_info structure. */
411
412 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
413
414 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
415 #define is_elf_hash_table(htab) \
416 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
417
418 /* Used by bfd_section_from_r_symndx to cache a small number of local
419 symbol to section mappings. */
420 #define LOCAL_SYM_CACHE_SIZE 32
421 struct sym_sec_cache
422 {
423 bfd *abfd;
424 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
425 asection *sec[LOCAL_SYM_CACHE_SIZE];
426 };
427 \f
428 /* Constant information held for an ELF backend. */
429
430 struct elf_size_info {
431 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
432 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
433
434 /* The size of entries in the .hash section. */
435 unsigned char sizeof_hash_entry;
436
437 /* The number of internal relocations to allocate per external
438 relocation entry. */
439 unsigned char int_rels_per_ext_rel;
440 /* We use some fixed size arrays. This should be large enough to
441 handle all back-ends. */
442 #define MAX_INT_RELS_PER_EXT_REL 3
443
444 unsigned char arch_size, log_file_align;
445 unsigned char elfclass, ev_current;
446 int (*write_out_phdrs)
447 (bfd *, const Elf_Internal_Phdr *, unsigned int);
448 bfd_boolean
449 (*write_shdrs_and_ehdr) (bfd *);
450 void (*write_relocs)
451 (bfd *, asection *, void *);
452 bfd_boolean (*swap_symbol_in)
453 (bfd *, const void *, const void *, Elf_Internal_Sym *);
454 void (*swap_symbol_out)
455 (bfd *, const Elf_Internal_Sym *, void *, void *);
456 bfd_boolean (*slurp_reloc_table)
457 (bfd *, asection *, asymbol **, bfd_boolean);
458 long (*slurp_symbol_table)
459 (bfd *, asymbol **, bfd_boolean);
460 void (*swap_dyn_in)
461 (bfd *, const void *, Elf_Internal_Dyn *);
462 void (*swap_dyn_out)
463 (bfd *, const Elf_Internal_Dyn *, void *);
464
465 /* This function is called to swap in a REL relocation. If an
466 external relocation corresponds to more than one internal
467 relocation, then all relocations are swapped in at once. */
468 void (*swap_reloc_in)
469 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
470
471 /* This function is called to swap out a REL relocation. */
472 void (*swap_reloc_out)
473 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
474
475 /* This function is called to swap in a RELA relocation. If an
476 external relocation corresponds to more than one internal
477 relocation, then all relocations are swapped in at once. */
478 void (*swap_reloca_in)
479 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
480
481 /* This function is called to swap out a RELA relocation. */
482 void (*swap_reloca_out)
483 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
484 };
485
486 #define elf_symbol_from(ABFD,S) \
487 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
488 && (S)->the_bfd->tdata.elf_obj_data != 0) \
489 ? (elf_symbol_type *) (S) \
490 : 0)
491
492 enum elf_reloc_type_class {
493 reloc_class_normal,
494 reloc_class_relative,
495 reloc_class_plt,
496 reloc_class_copy
497 };
498
499 struct elf_reloc_cookie
500 {
501 Elf_Internal_Rela *rels, *rel, *relend;
502 Elf_Internal_Sym *locsyms;
503 bfd *abfd;
504 size_t locsymcount;
505 size_t extsymoff;
506 struct elf_link_hash_entry **sym_hashes;
507 int r_sym_shift;
508 bfd_boolean bad_symtab;
509 };
510
511 /* The level of IRIX compatibility we're striving for. */
512
513 typedef enum {
514 ict_none,
515 ict_irix5,
516 ict_irix6
517 } irix_compat_t;
518
519 /* Mapping of ELF section names and types. */
520 struct bfd_elf_special_section
521 {
522 const char *prefix;
523 int prefix_length;
524 /* 0 means name must match PREFIX exactly.
525 -1 means name must start with PREFIX followed by an arbitrary string.
526 -2 means name must match PREFIX exactly or consist of PREFIX followed
527 by a dot then anything.
528 > 0 means name must start with the first PREFIX_LENGTH chars of
529 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
530 int suffix_length;
531 int type;
532 int attr;
533 };
534
535 enum action_discarded
536 {
537 COMPLAIN = 1,
538 PRETEND = 2
539 };
540
541 struct elf_backend_data
542 {
543 /* The architecture for this backend. */
544 enum bfd_architecture arch;
545
546 /* The ELF machine code (EM_xxxx) for this backend. */
547 int elf_machine_code;
548
549 /* The maximum page size for this backend. */
550 bfd_vma maxpagesize;
551
552 /* The minimum page size for this backend. An input object will not be
553 considered page aligned unless its sections are correctly aligned for
554 pages at least this large. May be smaller than maxpagesize. */
555 bfd_vma minpagesize;
556
557 /* The common page size for this backend. */
558 bfd_vma commonpagesize;
559
560 /* The BFD flags applied to sections created for dynamic linking. */
561 flagword dynamic_sec_flags;
562
563 /* A function to translate an ELF RELA relocation to a BFD arelent
564 structure. */
565 void (*elf_info_to_howto)
566 (bfd *, arelent *, Elf_Internal_Rela *);
567
568 /* A function to translate an ELF REL relocation to a BFD arelent
569 structure. */
570 void (*elf_info_to_howto_rel)
571 (bfd *, arelent *, Elf_Internal_Rela *);
572
573 /* A function to determine whether a symbol is global when
574 partitioning the symbol table into local and global symbols.
575 This should be NULL for most targets, in which case the correct
576 thing will be done. MIPS ELF, at least on the Irix 5, has
577 special requirements. */
578 bfd_boolean (*elf_backend_sym_is_global)
579 (bfd *, asymbol *);
580
581 /* The remaining functions are hooks which are called only if they
582 are not NULL. */
583
584 /* A function to permit a backend specific check on whether a
585 particular BFD format is relevant for an object file, and to
586 permit the backend to set any global information it wishes. When
587 this is called elf_elfheader is set, but anything else should be
588 used with caution. If this returns FALSE, the check_format
589 routine will return a bfd_error_wrong_format error. */
590 bfd_boolean (*elf_backend_object_p)
591 (bfd *);
592
593 /* A function to do additional symbol processing when reading the
594 ELF symbol table. This is where any processor-specific special
595 section indices are handled. */
596 void (*elf_backend_symbol_processing)
597 (bfd *, asymbol *);
598
599 /* A function to do additional symbol processing after reading the
600 entire ELF symbol table. */
601 bfd_boolean (*elf_backend_symbol_table_processing)
602 (bfd *, elf_symbol_type *, unsigned int);
603
604 /* A function to set the type of the info field. Processor-specific
605 types should be handled here. */
606 int (*elf_backend_get_symbol_type)
607 (Elf_Internal_Sym *, int);
608
609 /* A function to return the linker hash table entry of a symbol that
610 might be satisfied by an archive symbol. */
611 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
612 (bfd *, struct bfd_link_info *, const char *);
613
614 /* Return true if local section symbols should have a non-null st_name.
615 NULL implies false. */
616 bfd_boolean (*elf_backend_name_local_section_symbols)
617 (bfd *);
618
619 /* A function to do additional processing on the ELF section header
620 just before writing it out. This is used to set the flags and
621 type fields for some sections, or to actually write out data for
622 unusual sections. */
623 bfd_boolean (*elf_backend_section_processing)
624 (bfd *, Elf_Internal_Shdr *);
625
626 /* A function to handle unusual section types when creating BFD
627 sections from ELF sections. */
628 bfd_boolean (*elf_backend_section_from_shdr)
629 (bfd *, Elf_Internal_Shdr *, const char *, int);
630
631 /* A function to convert machine dependent ELF section header flags to
632 BFD internal section header flags. */
633 bfd_boolean (*elf_backend_section_flags)
634 (flagword *, const Elf_Internal_Shdr *);
635
636 /* A function that returns a struct containing ELF section flags and
637 type for the given BFD section. */
638 const struct bfd_elf_special_section * (*get_sec_type_attr)
639 (bfd *, asection *);
640
641 /* A function to handle unusual program segment types when creating BFD
642 sections from ELF program segments. */
643 bfd_boolean (*elf_backend_section_from_phdr)
644 (bfd *, Elf_Internal_Phdr *, int, const char *);
645
646 /* A function to set up the ELF section header for a BFD section in
647 preparation for writing it out. This is where the flags and type
648 fields are set for unusual sections. */
649 bfd_boolean (*elf_backend_fake_sections)
650 (bfd *, Elf_Internal_Shdr *, asection *);
651
652 /* A function to get the ELF section index for a BFD section. If
653 this returns TRUE, the section was found. If it is a normal ELF
654 section, *RETVAL should be left unchanged. If it is not a normal
655 ELF section *RETVAL should be set to the SHN_xxxx index. */
656 bfd_boolean (*elf_backend_section_from_bfd_section)
657 (bfd *, asection *, int *retval);
658
659 /* If this field is not NULL, it is called by the add_symbols phase
660 of a link just before adding a symbol to the global linker hash
661 table. It may modify any of the fields as it wishes. If *NAME
662 is set to NULL, the symbol will be skipped rather than being
663 added to the hash table. This function is responsible for
664 handling all processor dependent symbol bindings and section
665 indices, and must set at least *FLAGS and *SEC for each processor
666 dependent case; failure to do so will cause a link error. */
667 bfd_boolean (*elf_add_symbol_hook)
668 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
669 const char **name, flagword *flags, asection **sec, bfd_vma *value);
670
671 /* If this field is not NULL, it is called by the elf_link_output_sym
672 phase of a link for each symbol which will appear in the object file. */
673 bfd_boolean (*elf_backend_link_output_symbol_hook)
674 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
675 asection *, struct elf_link_hash_entry *);
676
677 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
678 linker the first time it encounters a dynamic object in the link.
679 This function must create any sections required for dynamic
680 linking. The ABFD argument is a dynamic object. The .interp,
681 .dynamic, .dynsym, .dynstr, and .hash functions have already been
682 created, and this function may modify the section flags if
683 desired. This function will normally create the .got and .plt
684 sections, but different backends have different requirements. */
685 bfd_boolean (*elf_backend_create_dynamic_sections)
686 (bfd *abfd, struct bfd_link_info *info);
687
688 /* When creating a shared library, determine whether to omit the
689 dynamic symbol for the section. */
690 bfd_boolean (*elf_backend_omit_section_dynsym)
691 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
692
693 /* The CHECK_RELOCS function is called by the add_symbols phase of
694 the ELF backend linker. It is called once for each section with
695 relocs of an object file, just after the symbols for the object
696 file have been added to the global linker hash table. The
697 function must look through the relocs and do any special handling
698 required. This generally means allocating space in the global
699 offset table, and perhaps allocating space for a reloc. The
700 relocs are always passed as Rela structures; if the section
701 actually uses Rel structures, the r_addend field will always be
702 zero. */
703 bfd_boolean (*check_relocs)
704 (bfd *abfd, struct bfd_link_info *info, asection *o,
705 const Elf_Internal_Rela *relocs);
706
707 /* The CHECK_DIRECTIVES function is called once per input file by
708 the add_symbols phase of the ELF backend linker. The function
709 must inspect the bfd and create any additional symbols according
710 to any custom directives in the bfd. */
711 bfd_boolean (*check_directives)
712 (bfd *abfd, struct bfd_link_info *info);
713
714 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
715 linker for every symbol which is defined by a dynamic object and
716 referenced by a regular object. This is called after all the
717 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
718 function has been called. The hash table entry should be
719 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
720 defined in a section from a dynamic object. Dynamic object
721 sections are not included in the final link, and this function is
722 responsible for changing the value to something which the rest of
723 the link can deal with. This will normally involve adding an
724 entry to the .plt or .got or some such section, and setting the
725 symbol to point to that. */
726 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
727 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
728
729 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
730 after all the linker input files have been seen but before the
731 section sizes have been set. This is called after
732 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
733 bfd_boolean (*elf_backend_always_size_sections)
734 (bfd *output_bfd, struct bfd_link_info *info);
735
736 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
737 linker after all the linker input files have been seen but before
738 the sections sizes have been set. This is called after
739 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
740 It is only called when linking against a dynamic object. It must
741 set the sizes of the dynamic sections, and may fill in their
742 contents as well. The generic ELF linker can handle the .dynsym,
743 .dynstr and .hash sections. This function must handle the
744 .interp section and any sections created by the
745 CREATE_DYNAMIC_SECTIONS entry point. */
746 bfd_boolean (*elf_backend_size_dynamic_sections)
747 (bfd *output_bfd, struct bfd_link_info *info);
748
749 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
750 we keep to use as a base for relocs and symbols. */
751 void (*elf_backend_init_index_section)
752 (bfd *output_bfd, struct bfd_link_info *info);
753
754 /* The RELOCATE_SECTION function is called by the ELF backend linker
755 to handle the relocations for a section.
756
757 The relocs are always passed as Rela structures; if the section
758 actually uses Rel structures, the r_addend field will always be
759 zero.
760
761 This function is responsible for adjust the section contents as
762 necessary, and (if using Rela relocs and generating a
763 relocatable output file) adjusting the reloc addend as
764 necessary.
765
766 This function does not have to worry about setting the reloc
767 address or the reloc symbol index.
768
769 LOCAL_SYMS is a pointer to the swapped in local symbols.
770
771 LOCAL_SECTIONS is an array giving the section in the input file
772 corresponding to the st_shndx field of each local symbol.
773
774 The global hash table entry for the global symbols can be found
775 via elf_sym_hashes (input_bfd).
776
777 When generating relocatable output, this function must handle
778 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
779 going to be the section symbol corresponding to the output
780 section, which means that the addend must be adjusted
781 accordingly. */
782 bfd_boolean (*elf_backend_relocate_section)
783 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
784 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
785 Elf_Internal_Sym *local_syms, asection **local_sections);
786
787 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
788 linker just before it writes a symbol out to the .dynsym section.
789 The processor backend may make any required adjustment to the
790 symbol. It may also take the opportunity to set contents of the
791 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
792 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
793 on those symbols which are defined by a dynamic object. */
794 bfd_boolean (*elf_backend_finish_dynamic_symbol)
795 (bfd *output_bfd, struct bfd_link_info *info,
796 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
797
798 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
799 linker just before it writes all the dynamic sections out to the
800 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
801 all dynamic symbols. */
802 bfd_boolean (*elf_backend_finish_dynamic_sections)
803 (bfd *output_bfd, struct bfd_link_info *info);
804
805 /* A function to do any beginning processing needed for the ELF file
806 before building the ELF headers and computing file positions. */
807 void (*elf_backend_begin_write_processing)
808 (bfd *, struct bfd_link_info *);
809
810 /* A function to do any final processing needed for the ELF file
811 before writing it out. The LINKER argument is TRUE if this BFD
812 was created by the ELF backend linker. */
813 void (*elf_backend_final_write_processing)
814 (bfd *, bfd_boolean linker);
815
816 /* This function is called by get_program_header_size. It should
817 return the number of additional program segments which this BFD
818 will need. It should return -1 on error. */
819 int (*elf_backend_additional_program_headers)
820 (bfd *, struct bfd_link_info *);
821
822 /* This function is called to modify an existing segment map in a
823 backend specific fashion. */
824 bfd_boolean (*elf_backend_modify_segment_map)
825 (bfd *, struct bfd_link_info *);
826
827 /* This function is called to modify program headers just before
828 they are written. */
829 bfd_boolean (*elf_backend_modify_program_headers)
830 (bfd *, struct bfd_link_info *);
831
832 /* This function is called during section garbage collection to
833 mark sections that define global symbols. */
834 bfd_boolean (*gc_mark_dynamic_ref)
835 (struct elf_link_hash_entry *h, void *inf);
836
837 /* This function is called during section gc to discover the section a
838 particular relocation refers to. */
839 asection * (*gc_mark_hook)
840 (asection *sec, struct bfd_link_info *, Elf_Internal_Rela *,
841 struct elf_link_hash_entry *h, Elf_Internal_Sym *);
842
843 /* This function, if defined, is called during the sweep phase of gc
844 in order that a backend might update any data structures it might
845 be maintaining. */
846 bfd_boolean (*gc_sweep_hook)
847 (bfd *abfd, struct bfd_link_info *info, asection *o,
848 const Elf_Internal_Rela *relocs);
849
850 /* This function, if defined, is called after the ELF headers have
851 been created. This allows for things like the OS and ABI versions
852 to be changed. */
853 void (*elf_backend_post_process_headers)
854 (bfd *, struct bfd_link_info *);
855
856 /* This function, if defined, prints a symbol to file and returns the
857 name of the symbol to be printed. It should return NULL to fall
858 back to default symbol printing. */
859 const char *(*elf_backend_print_symbol_all)
860 (bfd *, void *, asymbol *);
861
862 /* This function, if defined, is called after all local symbols and
863 global symbols converted to locals are emitted into the symtab
864 section. It allows the backend to emit special local symbols
865 not handled in the hash table. */
866 bfd_boolean (*elf_backend_output_arch_local_syms)
867 (bfd *, struct bfd_link_info *, void *,
868 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
869 struct elf_link_hash_entry *));
870
871 /* This function, if defined, is called after all symbols are emitted
872 into the symtab section. It allows the backend to emit special
873 global symbols not handled in the hash table. */
874 bfd_boolean (*elf_backend_output_arch_syms)
875 (bfd *, struct bfd_link_info *, void *,
876 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
877 struct elf_link_hash_entry *));
878
879 /* Copy any information related to dynamic linking from a pre-existing
880 symbol to a newly created symbol. Also called to copy flags and
881 other back-end info to a weakdef, in which case the symbol is not
882 newly created and plt/got refcounts and dynamic indices should not
883 be copied. */
884 void (*elf_backend_copy_indirect_symbol)
885 (struct bfd_link_info *, struct elf_link_hash_entry *,
886 struct elf_link_hash_entry *);
887
888 /* Modify any information related to dynamic linking such that the
889 symbol is not exported. */
890 void (*elf_backend_hide_symbol)
891 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
892
893 /* A function to do additional symbol fixup, called by
894 _bfd_elf_fix_symbol_flags. */
895 bfd_boolean (*elf_backend_fixup_symbol)
896 (struct bfd_link_info *, struct elf_link_hash_entry *);
897
898 /* Merge the backend specific symbol attribute. */
899 void (*elf_backend_merge_symbol_attribute)
900 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
901 bfd_boolean);
902
903 /* Decide whether an undefined symbol is special and can be ignored.
904 This is the case for OPTIONAL symbols on IRIX. */
905 bfd_boolean (*elf_backend_ignore_undef_symbol)
906 (struct elf_link_hash_entry *);
907
908 /* Emit relocations. Overrides default routine for emitting relocs,
909 except during a relocatable link, or if all relocs are being emitted. */
910 bfd_boolean (*elf_backend_emit_relocs)
911 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
912 struct elf_link_hash_entry **);
913
914 /* Count relocations. Not called for relocatable links
915 or if all relocs are being preserved in the output. */
916 unsigned int (*elf_backend_count_relocs)
917 (asection *, Elf_Internal_Rela *);
918
919 /* This function, if defined, is called when an NT_PRSTATUS note is found
920 in a core file. */
921 bfd_boolean (*elf_backend_grok_prstatus)
922 (bfd *, Elf_Internal_Note *);
923
924 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
925 note is found in a core file. */
926 bfd_boolean (*elf_backend_grok_psinfo)
927 (bfd *, Elf_Internal_Note *);
928
929 /* Functions to print VMAs. Special code to handle 64 bit ELF files. */
930 void (* elf_backend_sprintf_vma)
931 (bfd *, char *, bfd_vma);
932 void (* elf_backend_fprintf_vma)
933 (bfd *, void *, bfd_vma);
934
935 /* This function returns class of a reloc type. */
936 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
937 (const Elf_Internal_Rela *);
938
939 /* This function, if defined, removes information about discarded functions
940 from other sections which mention them. */
941 bfd_boolean (*elf_backend_discard_info)
942 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
943
944 /* This function, if defined, signals that the function above has removed
945 the discarded relocations for this section. */
946 bfd_boolean (*elf_backend_ignore_discarded_relocs)
947 (asection *);
948
949 /* What to do when ld finds relocations against symbols defined in
950 discarded sections. */
951 unsigned int (*action_discarded)
952 (asection *);
953
954 /* This function returns the width of FDE pointers in bytes, or 0 if
955 that can't be determined for some reason. The default definition
956 goes by the bfd's EI_CLASS. */
957 unsigned int (*elf_backend_eh_frame_address_size)
958 (bfd *, asection *);
959
960 /* These functions tell elf-eh-frame whether to attempt to turn
961 absolute or lsda encodings into pc-relative ones. The default
962 definition enables these transformations. */
963 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
964 (bfd *, struct bfd_link_info *, asection *);
965 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
966 (bfd *, struct bfd_link_info *, asection *);
967
968 /* This function returns an encoding after computing the encoded
969 value (and storing it in ENCODED) for the given OFFSET into OSEC,
970 to be stored in at LOC_OFFSET into the LOC_SEC input section.
971 The default definition chooses a 32-bit PC-relative encoding. */
972 bfd_byte (*elf_backend_encode_eh_address)
973 (bfd *abfd, struct bfd_link_info *info,
974 asection *osec, bfd_vma offset,
975 asection *loc_sec, bfd_vma loc_offset,
976 bfd_vma *encoded);
977
978 /* This function, if defined, may write out the given section.
979 Returns TRUE if it did so and FALSE if the caller should. */
980 bfd_boolean (*elf_backend_write_section)
981 (bfd *, asection *, bfd_byte *);
982
983 /* The level of IRIX compatibility we're striving for.
984 MIPS ELF specific function. */
985 irix_compat_t (*elf_backend_mips_irix_compat)
986 (bfd *);
987
988 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
989 (unsigned int, bfd_boolean);
990
991 /* The swapping table to use when dealing with ECOFF information.
992 Used for the MIPS ELF .mdebug section. */
993 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
994
995 /* This function implements `bfd_elf_bfd_from_remote_memory';
996 see elf.c, elfcode.h. */
997 bfd *(*elf_backend_bfd_from_remote_memory)
998 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
999 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1000
1001 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1002 see elf.c. */
1003 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1004
1005 /* Is symbol defined in common section? */
1006 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1007
1008 /* Return a common section index for section. */
1009 unsigned int (*common_section_index) (asection *);
1010
1011 /* Return a common section for section. */
1012 asection *(*common_section) (asection *);
1013
1014 /* Return TRUE if we can merge 2 definitions. */
1015 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1016 struct elf_link_hash_entry **,
1017 struct elf_link_hash_entry *,
1018 Elf_Internal_Sym *, asection **,
1019 bfd_vma *, unsigned int *,
1020 bfd_boolean *, bfd_boolean *,
1021 bfd_boolean *, bfd_boolean *,
1022 bfd_boolean *, bfd_boolean *,
1023 bfd_boolean *, bfd_boolean *,
1024 bfd *, asection **,
1025 bfd_boolean *, bfd_boolean *,
1026 bfd_boolean *, bfd_boolean *,
1027 bfd *, asection **);
1028
1029 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1030 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1031
1032 /* Used to handle bad SHF_LINK_ORDER input. */
1033 bfd_error_handler_type link_order_error_handler;
1034
1035 /* Name of the PLT relocation section. */
1036 const char *relplt_name;
1037
1038 /* Alternate EM_xxxx machine codes for this backend. */
1039 int elf_machine_alt1;
1040 int elf_machine_alt2;
1041
1042 const struct elf_size_info *s;
1043
1044 /* An array of target specific special sections. */
1045 const struct bfd_elf_special_section *special_sections;
1046
1047 /* The size in bytes of the header for the GOT. This includes the
1048 so-called reserved entries on some systems. */
1049 bfd_vma got_header_size;
1050
1051 /* This is TRUE if the linker should act like collect and gather
1052 global constructors and destructors by name. This is TRUE for
1053 MIPS ELF because the Irix 5 tools can not handle the .init
1054 section. */
1055 unsigned collect : 1;
1056
1057 /* This is TRUE if the linker should ignore changes to the type of a
1058 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1059 record undefined functions as STT_OBJECT although the definitions
1060 are STT_FUNC. */
1061 unsigned type_change_ok : 1;
1062
1063 /* Whether the backend may use REL relocations. (Some backends use
1064 both REL and RELA relocations, and this flag is set for those
1065 backends.) */
1066 unsigned may_use_rel_p : 1;
1067
1068 /* Whether the backend may use RELA relocations. (Some backends use
1069 both REL and RELA relocations, and this flag is set for those
1070 backends.) */
1071 unsigned may_use_rela_p : 1;
1072
1073 /* Whether the default relocation type is RELA. If a backend with
1074 this flag set wants REL relocations for a particular section,
1075 it must note that explicitly. Similarly, if this flag is clear,
1076 and the backend wants RELA relocations for a particular
1077 section. */
1078 unsigned default_use_rela_p : 1;
1079
1080 /* Set if RELA relocations for a relocatable link can be handled by
1081 generic code. Backends that set this flag need do nothing in the
1082 backend relocate_section routine for relocatable linking. */
1083 unsigned rela_normal : 1;
1084
1085 /* TRUE if addresses "naturally" sign extend. This is used when
1086 swapping in from Elf32 when BFD64. */
1087 unsigned sign_extend_vma : 1;
1088
1089 unsigned want_got_plt : 1;
1090 unsigned plt_readonly : 1;
1091 unsigned want_plt_sym : 1;
1092 unsigned plt_not_loaded : 1;
1093 unsigned plt_alignment : 4;
1094 unsigned can_gc_sections : 1;
1095 unsigned can_refcount : 1;
1096 unsigned want_got_sym : 1;
1097 unsigned want_dynbss : 1;
1098 /* Targets which do not support physical addressing often require
1099 that the p_paddr field in the section header to be set to zero.
1100 This field indicates whether this behavior is required. */
1101 unsigned want_p_paddr_set_to_zero : 1;
1102 };
1103
1104 /* Information stored for each BFD section in an ELF file. This
1105 structure is allocated by elf_new_section_hook. */
1106
1107 struct bfd_elf_section_data
1108 {
1109 /* The ELF header for this section. */
1110 Elf_Internal_Shdr this_hdr;
1111
1112 /* The ELF header for the reloc section associated with this
1113 section, if any. */
1114 Elf_Internal_Shdr rel_hdr;
1115
1116 /* If there is a second reloc section associated with this section,
1117 as can happen on Irix 6, this field points to the header. */
1118 Elf_Internal_Shdr *rel_hdr2;
1119
1120 /* The number of relocations currently assigned to REL_HDR. */
1121 unsigned int rel_count;
1122
1123 /* The number of relocations currently assigned to REL_HDR2. */
1124 unsigned int rel_count2;
1125
1126 /* The ELF section number of this section. */
1127 int this_idx;
1128
1129 /* The ELF section number of the reloc section indicated by
1130 REL_HDR if any. Only used for an output file. */
1131 int rel_idx;
1132
1133 /* The ELF section number of the reloc section indicated by
1134 REL_HDR2 if any. Only used for an output file. */
1135 int rel_idx2;
1136
1137 /* Used by the backend linker when generating a shared library to
1138 record the dynamic symbol index for a section symbol
1139 corresponding to this section. A value of 0 means that there is
1140 no dynamic symbol for this section. */
1141 int dynindx;
1142
1143 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1144 asection *linked_to;
1145
1146 /* Used by the backend linker to store the symbol hash table entries
1147 associated with relocs against global symbols. */
1148 struct elf_link_hash_entry **rel_hashes;
1149
1150 /* A pointer to the swapped relocs. If the section uses REL relocs,
1151 rather than RELA, all the r_addend fields will be zero. This
1152 pointer may be NULL. It is used by the backend linker. */
1153 Elf_Internal_Rela *relocs;
1154
1155 /* A pointer to a linked list tracking dynamic relocs copied for
1156 local symbols. */
1157 void *local_dynrel;
1158
1159 /* A pointer to the bfd section used for dynamic relocs. */
1160 asection *sreloc;
1161
1162 union {
1163 /* Group name, if this section is a member of a group. */
1164 const char *name;
1165
1166 /* Group signature sym, if this is the SHT_GROUP section. */
1167 struct bfd_symbol *id;
1168 } group;
1169
1170 /* Optional information about section group; NULL if it doesn't
1171 belongs to any section group. */
1172 asection *sec_group;
1173
1174 /* A linked list of sections in the group. Circular when used by
1175 the linker. */
1176 asection *next_in_group;
1177
1178 /* A pointer used for various section optimizations. */
1179 void *sec_info;
1180 };
1181
1182 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1183 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1184 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1185 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1186 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1187 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1188 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1189 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1190
1191 /* Return TRUE if section has been discarded. */
1192 #define elf_discarded_section(sec) \
1193 (!bfd_is_abs_section (sec) \
1194 && bfd_is_abs_section ((sec)->output_section) \
1195 && (sec)->sec_info_type != ELF_INFO_TYPE_MERGE \
1196 && (sec)->sec_info_type != ELF_INFO_TYPE_JUST_SYMS)
1197
1198 #define xvec_get_elf_backend_data(xvec) \
1199 ((struct elf_backend_data *) (xvec)->backend_data)
1200
1201 #define get_elf_backend_data(abfd) \
1202 xvec_get_elf_backend_data ((abfd)->xvec)
1203
1204 /* This struct is used to pass information to routines called via
1205 elf_link_hash_traverse which must return failure. */
1206
1207 struct elf_info_failed
1208 {
1209 bfd_boolean failed;
1210 struct bfd_link_info *info;
1211 struct bfd_elf_version_tree *verdefs;
1212 };
1213
1214 /* This structure is used to pass information to
1215 _bfd_elf_link_assign_sym_version. */
1216
1217 struct elf_assign_sym_version_info
1218 {
1219 /* Output BFD. */
1220 bfd *output_bfd;
1221 /* General link information. */
1222 struct bfd_link_info *info;
1223 /* Version tree. */
1224 struct bfd_elf_version_tree *verdefs;
1225 /* Whether we had a failure. */
1226 bfd_boolean failed;
1227 };
1228
1229 /* This structure is used to pass information to
1230 _bfd_elf_link_find_version_dependencies. */
1231
1232 struct elf_find_verdep_info
1233 {
1234 /* Output BFD. */
1235 bfd *output_bfd;
1236 /* General link information. */
1237 struct bfd_link_info *info;
1238 /* The number of dependencies. */
1239 unsigned int vers;
1240 /* Whether we had a failure. */
1241 bfd_boolean failed;
1242 };
1243
1244 /* Some private data is stashed away for future use using the tdata pointer
1245 in the bfd structure. */
1246
1247 struct elf_obj_tdata
1248 {
1249 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1250 Elf_Internal_Shdr **elf_sect_ptr;
1251 Elf_Internal_Phdr *phdr;
1252 struct elf_segment_map *segment_map;
1253 struct elf_strtab_hash *strtab_ptr;
1254 int num_locals;
1255 int num_globals;
1256 unsigned int num_elf_sections; /* elf_sect_ptr size */
1257 int num_section_syms;
1258 asymbol **section_syms; /* STT_SECTION symbols for each section */
1259 Elf_Internal_Shdr symtab_hdr;
1260 Elf_Internal_Shdr shstrtab_hdr;
1261 Elf_Internal_Shdr strtab_hdr;
1262 Elf_Internal_Shdr dynsymtab_hdr;
1263 Elf_Internal_Shdr dynstrtab_hdr;
1264 Elf_Internal_Shdr dynversym_hdr;
1265 Elf_Internal_Shdr dynverref_hdr;
1266 Elf_Internal_Shdr dynverdef_hdr;
1267 Elf_Internal_Shdr symtab_shndx_hdr;
1268 unsigned int symtab_section, shstrtab_section;
1269 unsigned int strtab_section, dynsymtab_section;
1270 unsigned int symtab_shndx_section;
1271 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1272 file_ptr next_file_pos;
1273 bfd_vma gp; /* The gp value */
1274 unsigned int gp_size; /* The gp size */
1275
1276 /* Information grabbed from an elf core file. */
1277 int core_signal;
1278 int core_pid;
1279 int core_lwpid;
1280 char* core_program;
1281 char* core_command;
1282
1283 /* A mapping from external symbols to entries in the linker hash
1284 table, used when linking. This is indexed by the symbol index
1285 minus the sh_info field of the symbol table header. */
1286 struct elf_link_hash_entry **sym_hashes;
1287
1288 /* Track usage and final offsets of GOT entries for local symbols.
1289 This array is indexed by symbol index. Elements are used
1290 identically to "got" in struct elf_link_hash_entry. */
1291 union
1292 {
1293 bfd_signed_vma *refcounts;
1294 bfd_vma *offsets;
1295 struct got_entry **ents;
1296 } local_got;
1297
1298 /* The linker ELF emulation code needs to let the backend ELF linker
1299 know what filename should be used for a dynamic object if the
1300 dynamic object is found using a search. The emulation code then
1301 sometimes needs to know what name was actually used. Until the
1302 file has been added to the linker symbol table, this field holds
1303 the name the linker wants. After it has been added, it holds the
1304 name actually used, which will be the DT_SONAME entry if there is
1305 one. */
1306 const char *dt_name;
1307
1308 /* Records the result of `get_program_header_size'. */
1309 bfd_size_type program_header_size;
1310
1311 /* Used by find_nearest_line entry point. */
1312 void *line_info;
1313
1314 /* Used by MIPS ELF find_nearest_line entry point. The structure
1315 could be included directly in this one, but there's no point to
1316 wasting the memory just for the infrequently called
1317 find_nearest_line. */
1318 struct mips_elf_find_line *find_line_info;
1319
1320 /* A place to stash dwarf1 info for this bfd. */
1321 struct dwarf1_debug *dwarf1_find_line_info;
1322
1323 /* A place to stash dwarf2 info for this bfd. */
1324 void *dwarf2_find_line_info;
1325
1326 /* An array of stub sections indexed by symbol number, used by the
1327 MIPS ELF linker. FIXME: We should figure out some way to only
1328 include this field for a MIPS ELF target. */
1329 asection **local_stubs;
1330 asection **local_call_stubs;
1331
1332 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1333 created. */
1334 asection *eh_frame_hdr;
1335
1336 Elf_Internal_Shdr **group_sect_ptr;
1337 int num_group;
1338
1339 /* Number of symbol version definitions we are about to emit. */
1340 unsigned int cverdefs;
1341
1342 /* Number of symbol version references we are about to emit. */
1343 unsigned int cverrefs;
1344
1345 /* Segment flags for the PT_GNU_STACK segment. */
1346 unsigned int stack_flags;
1347
1348 /* Should the PT_GNU_RELRO segment be emitted? */
1349 bfd_boolean relro;
1350
1351 /* Symbol version definitions in external objects. */
1352 Elf_Internal_Verdef *verdef;
1353
1354 /* Symbol version references to external objects. */
1355 Elf_Internal_Verneed *verref;
1356
1357 /* The Irix 5 support uses two virtual sections, which represent
1358 text/data symbols defined in dynamic objects. */
1359 asymbol *elf_data_symbol;
1360 asymbol *elf_text_symbol;
1361 asection *elf_data_section;
1362 asection *elf_text_section;
1363
1364 /* Whether a dyanmic object was specified normally on the linker
1365 command line, or was specified when --as-needed was in effect,
1366 or was found via a DT_NEEDED entry. */
1367 enum dynamic_lib_link_class dyn_lib_class;
1368
1369 /* This is set to TRUE if the object was created by the backend
1370 linker. */
1371 bfd_boolean linker;
1372
1373 /* Irix 5 often screws up the symbol table, sorting local symbols
1374 after global symbols. This flag is set if the symbol table in
1375 this BFD appears to be screwed up. If it is, we ignore the
1376 sh_info field in the symbol table header, and always read all the
1377 symbols. */
1378 bfd_boolean bad_symtab;
1379
1380 /* Used to determine if the e_flags field has been initialized */
1381 bfd_boolean flags_init;
1382
1383 /* Symbol buffer. */
1384 Elf_Internal_Sym *symbuf;
1385 };
1386
1387 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1388 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1389 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1390 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1391 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1392 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1393 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1394 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1395 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1396 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1397 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1398 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1399 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1400 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1401 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1402 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1403 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1404 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1405 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1406 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1407 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1408 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1409 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1410 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1411 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1412 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1413 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1414 \f
1415 extern void _bfd_elf_swap_verdef_in
1416 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1417 extern void _bfd_elf_swap_verdef_out
1418 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1419 extern void _bfd_elf_swap_verdaux_in
1420 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1421 extern void _bfd_elf_swap_verdaux_out
1422 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1423 extern void _bfd_elf_swap_verneed_in
1424 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1425 extern void _bfd_elf_swap_verneed_out
1426 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1427 extern void _bfd_elf_swap_vernaux_in
1428 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1429 extern void _bfd_elf_swap_vernaux_out
1430 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1431 extern void _bfd_elf_swap_versym_in
1432 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1433 extern void _bfd_elf_swap_versym_out
1434 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1435
1436 extern int _bfd_elf_section_from_bfd_section
1437 (bfd *, asection *);
1438 extern char *bfd_elf_string_from_elf_section
1439 (bfd *, unsigned, unsigned);
1440 extern char *bfd_elf_get_str_section
1441 (bfd *, unsigned);
1442 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1443 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1444 Elf_External_Sym_Shndx *);
1445 extern const char *bfd_elf_sym_name
1446 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1447
1448 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1449 (bfd *, bfd *);
1450 extern bfd_boolean _bfd_elf_print_private_bfd_data
1451 (bfd *, void *);
1452 extern void bfd_elf_print_symbol
1453 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1454
1455 extern void _bfd_elf_sprintf_vma
1456 (bfd *, char *, bfd_vma);
1457 extern void _bfd_elf_fprintf_vma
1458 (bfd *, void *, bfd_vma);
1459
1460 extern unsigned int _bfd_elf_eh_frame_address_size
1461 (bfd *, asection *);
1462 extern bfd_byte _bfd_elf_encode_eh_address
1463 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1464 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1465 extern bfd_boolean _bfd_elf_can_make_relative
1466 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1467
1468 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1469 (const Elf_Internal_Rela *);
1470 extern bfd_vma _bfd_elf_rela_local_sym
1471 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1472 extern bfd_vma _bfd_elf_rel_local_sym
1473 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1474 extern bfd_vma _bfd_elf_section_offset
1475 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1476
1477 extern unsigned long bfd_elf_hash
1478 (const char *);
1479 extern unsigned long bfd_elf_gnu_hash
1480 (const char *);
1481
1482 extern bfd_reloc_status_type bfd_elf_generic_reloc
1483 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1484 extern bfd_boolean bfd_elf_mkobject
1485 (bfd *);
1486 extern bfd_boolean bfd_elf_mkcorefile
1487 (bfd *);
1488 extern Elf_Internal_Shdr *bfd_elf_find_section
1489 (bfd *, char *);
1490 extern bfd_boolean _bfd_elf_make_section_from_shdr
1491 (bfd *, Elf_Internal_Shdr *, const char *, int);
1492 extern bfd_boolean _bfd_elf_make_section_from_phdr
1493 (bfd *, Elf_Internal_Phdr *, int, const char *);
1494 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1495 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1496 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1497 (bfd *);
1498 extern void _bfd_elf_link_hash_copy_indirect
1499 (struct bfd_link_info *, struct elf_link_hash_entry *,
1500 struct elf_link_hash_entry *);
1501 extern void _bfd_elf_link_hash_hide_symbol
1502 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1503 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1504 (struct bfd_link_info *, struct elf_link_hash_entry *);
1505 extern bfd_boolean _bfd_elf_link_hash_table_init
1506 (struct elf_link_hash_table *, bfd *,
1507 struct bfd_hash_entry *(*)
1508 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1509 unsigned int);
1510 extern bfd_boolean _bfd_elf_slurp_version_tables
1511 (bfd *, bfd_boolean);
1512 extern bfd_boolean _bfd_elf_merge_sections
1513 (bfd *, struct bfd_link_info *);
1514 extern bfd_boolean _bfd_elf_match_sections_by_type
1515 (bfd *, const asection *, bfd *, const asection *);
1516 extern bfd_boolean bfd_elf_is_group_section
1517 (bfd *, const struct bfd_section *);
1518 extern void _bfd_elf_section_already_linked
1519 (bfd *, struct bfd_section *, struct bfd_link_info *);
1520 extern void bfd_elf_set_group_contents
1521 (bfd *, asection *, void *);
1522 extern asection *_bfd_elf_check_kept_section
1523 (asection *, struct bfd_link_info *);
1524 extern void _bfd_elf_link_just_syms
1525 (asection *, struct bfd_link_info *);
1526 extern bfd_boolean _bfd_elf_copy_private_header_data
1527 (bfd *, bfd *);
1528 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1529 (bfd *, asymbol *, bfd *, asymbol *);
1530 #define _bfd_generic_init_private_section_data \
1531 _bfd_elf_init_private_section_data
1532 extern bfd_boolean _bfd_elf_init_private_section_data
1533 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1534 extern bfd_boolean _bfd_elf_copy_private_section_data
1535 (bfd *, asection *, bfd *, asection *);
1536 extern bfd_boolean _bfd_elf_write_object_contents
1537 (bfd *);
1538 extern bfd_boolean _bfd_elf_write_corefile_contents
1539 (bfd *);
1540 extern bfd_boolean _bfd_elf_set_section_contents
1541 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1542 extern long _bfd_elf_get_symtab_upper_bound
1543 (bfd *);
1544 extern long _bfd_elf_canonicalize_symtab
1545 (bfd *, asymbol **);
1546 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1547 (bfd *);
1548 extern long _bfd_elf_canonicalize_dynamic_symtab
1549 (bfd *, asymbol **);
1550 extern long _bfd_elf_get_synthetic_symtab
1551 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1552 extern long _bfd_elf_get_reloc_upper_bound
1553 (bfd *, sec_ptr);
1554 extern long _bfd_elf_canonicalize_reloc
1555 (bfd *, sec_ptr, arelent **, asymbol **);
1556 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1557 (bfd *);
1558 extern long _bfd_elf_canonicalize_dynamic_reloc
1559 (bfd *, arelent **, asymbol **);
1560 extern asymbol *_bfd_elf_make_empty_symbol
1561 (bfd *);
1562 extern void _bfd_elf_get_symbol_info
1563 (bfd *, asymbol *, symbol_info *);
1564 extern bfd_boolean _bfd_elf_is_local_label_name
1565 (bfd *, const char *);
1566 extern alent *_bfd_elf_get_lineno
1567 (bfd *, asymbol *);
1568 extern bfd_boolean _bfd_elf_set_arch_mach
1569 (bfd *, enum bfd_architecture, unsigned long);
1570 extern bfd_boolean _bfd_elf_find_nearest_line
1571 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1572 unsigned int *);
1573 extern bfd_boolean _bfd_elf_find_line
1574 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1575 #define _bfd_generic_find_line _bfd_elf_find_line
1576 extern bfd_boolean _bfd_elf_find_inliner_info
1577 (bfd *, const char **, const char **, unsigned int *);
1578 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1579 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1580 extern int _bfd_elf_sizeof_headers
1581 (bfd *, struct bfd_link_info *);
1582 extern bfd_boolean _bfd_elf_new_section_hook
1583 (bfd *, asection *);
1584 extern bfd_boolean _bfd_elf_init_reloc_shdr
1585 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1586 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1587 (const char *, const struct bfd_elf_special_section *, unsigned int);
1588 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1589 (bfd *, asection *);
1590
1591 /* If the target doesn't have reloc handling written yet: */
1592 extern void _bfd_elf_no_info_to_howto
1593 (bfd *, arelent *, Elf_Internal_Rela *);
1594
1595 extern bfd_boolean bfd_section_from_shdr
1596 (bfd *, unsigned int shindex);
1597 extern bfd_boolean bfd_section_from_phdr
1598 (bfd *, Elf_Internal_Phdr *, int);
1599
1600 extern int _bfd_elf_symbol_from_bfd_symbol
1601 (bfd *, asymbol **);
1602
1603 extern asection *bfd_section_from_r_symndx
1604 (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1605 extern asection *bfd_section_from_elf_index
1606 (bfd *, unsigned int);
1607 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1608 (void);
1609
1610 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1611 (void);
1612 extern void _bfd_elf_strtab_free
1613 (struct elf_strtab_hash *);
1614 extern bfd_size_type _bfd_elf_strtab_add
1615 (struct elf_strtab_hash *, const char *, bfd_boolean);
1616 extern void _bfd_elf_strtab_addref
1617 (struct elf_strtab_hash *, bfd_size_type);
1618 extern void _bfd_elf_strtab_delref
1619 (struct elf_strtab_hash *, bfd_size_type);
1620 extern void _bfd_elf_strtab_clear_all_refs
1621 (struct elf_strtab_hash *);
1622 extern bfd_size_type _bfd_elf_strtab_size
1623 (struct elf_strtab_hash *);
1624 extern bfd_size_type _bfd_elf_strtab_offset
1625 (struct elf_strtab_hash *, bfd_size_type);
1626 extern bfd_boolean _bfd_elf_strtab_emit
1627 (bfd *, struct elf_strtab_hash *);
1628 extern void _bfd_elf_strtab_finalize
1629 (struct elf_strtab_hash *);
1630
1631 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1632 (bfd *, struct bfd_link_info *, asection *,
1633 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1634 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1635 (bfd *, struct bfd_link_info *);
1636 extern bfd_vma _bfd_elf_eh_frame_section_offset
1637 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1638 extern bfd_boolean _bfd_elf_write_section_eh_frame
1639 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1640 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1641 (bfd *, struct bfd_link_info *);
1642 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1643 (struct bfd_link_info *);
1644
1645 extern bfd_boolean _bfd_elf_merge_symbol
1646 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1647 asection **, bfd_vma *, unsigned int *,
1648 struct elf_link_hash_entry **, bfd_boolean *,
1649 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1650
1651 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1652
1653 extern bfd_boolean _bfd_elf_add_default_symbol
1654 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
1655 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
1656 bfd_boolean *, bfd_boolean);
1657
1658 extern bfd_boolean _bfd_elf_export_symbol
1659 (struct elf_link_hash_entry *, void *);
1660
1661 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1662 (struct elf_link_hash_entry *, void *);
1663
1664 extern bfd_boolean _bfd_elf_link_assign_sym_version
1665 (struct elf_link_hash_entry *, void *);
1666
1667 extern long _bfd_elf_link_lookup_local_dynindx
1668 (struct bfd_link_info *, bfd *, long);
1669 extern bfd_boolean _bfd_elf_compute_section_file_positions
1670 (bfd *, struct bfd_link_info *);
1671 extern void _bfd_elf_assign_file_positions_for_relocs
1672 (bfd *);
1673 extern file_ptr _bfd_elf_assign_file_position_for_section
1674 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1675
1676 extern bfd_boolean _bfd_elf_validate_reloc
1677 (bfd *, arelent *);
1678
1679 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1680 (bfd *, struct bfd_link_info *);
1681 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1682 (bfd *, struct bfd_link_info *, asection *);
1683 extern bfd_boolean _bfd_elf_create_dynamic_sections
1684 (bfd *, struct bfd_link_info *);
1685 extern bfd_boolean _bfd_elf_create_got_section
1686 (bfd *, struct bfd_link_info *);
1687 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1688 (bfd *, struct bfd_link_info *, asection *, const char *);
1689 extern void _bfd_elf_init_1_index_section
1690 (bfd *, struct bfd_link_info *);
1691 extern void _bfd_elf_init_2_index_sections
1692 (bfd *, struct bfd_link_info *);
1693
1694 extern bfd_boolean _bfd_elfcore_make_pseudosection
1695 (bfd *, char *, size_t, ufile_ptr);
1696 extern char *_bfd_elfcore_strndup
1697 (bfd *, char *, size_t);
1698
1699 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1700 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1701
1702 extern bfd_boolean _bfd_elf_link_size_reloc_section
1703 (bfd *, Elf_Internal_Shdr *, asection *);
1704
1705 extern bfd_boolean _bfd_elf_link_output_relocs
1706 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1707 struct elf_link_hash_entry **);
1708
1709 extern bfd_boolean _bfd_elf_fix_symbol_flags
1710 (struct elf_link_hash_entry *, struct elf_info_failed *);
1711
1712 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1713 (struct elf_link_hash_entry *, void *);
1714
1715 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1716 (struct elf_link_hash_entry *, void *);
1717
1718 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1719 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1720
1721 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1722 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1723
1724 extern bfd_boolean bfd_elf_match_symbols_in_sections
1725 (asection *, asection *, struct bfd_link_info *);
1726
1727 extern bfd_boolean _bfd_elf_setup_sections
1728 (bfd *);
1729
1730 extern const bfd_target *bfd_elf32_object_p
1731 (bfd *);
1732 extern const bfd_target *bfd_elf32_core_file_p
1733 (bfd *);
1734 extern char *bfd_elf32_core_file_failing_command
1735 (bfd *);
1736 extern int bfd_elf32_core_file_failing_signal
1737 (bfd *);
1738 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1739 (bfd *, bfd *);
1740
1741 extern bfd_boolean bfd_elf32_swap_symbol_in
1742 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1743 extern void bfd_elf32_swap_symbol_out
1744 (bfd *, const Elf_Internal_Sym *, void *, void *);
1745 extern void bfd_elf32_swap_reloc_in
1746 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1747 extern void bfd_elf32_swap_reloc_out
1748 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1749 extern void bfd_elf32_swap_reloca_in
1750 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1751 extern void bfd_elf32_swap_reloca_out
1752 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1753 extern void bfd_elf32_swap_phdr_in
1754 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1755 extern void bfd_elf32_swap_phdr_out
1756 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1757 extern void bfd_elf32_swap_dyn_in
1758 (bfd *, const void *, Elf_Internal_Dyn *);
1759 extern void bfd_elf32_swap_dyn_out
1760 (bfd *, const Elf_Internal_Dyn *, void *);
1761 extern long bfd_elf32_slurp_symbol_table
1762 (bfd *, asymbol **, bfd_boolean);
1763 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1764 (bfd *);
1765 extern int bfd_elf32_write_out_phdrs
1766 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1767 extern void bfd_elf32_write_relocs
1768 (bfd *, asection *, void *);
1769 extern bfd_boolean bfd_elf32_slurp_reloc_table
1770 (bfd *, asection *, asymbol **, bfd_boolean);
1771
1772 extern const bfd_target *bfd_elf64_object_p
1773 (bfd *);
1774 extern const bfd_target *bfd_elf64_core_file_p
1775 (bfd *);
1776 extern char *bfd_elf64_core_file_failing_command
1777 (bfd *);
1778 extern int bfd_elf64_core_file_failing_signal
1779 (bfd *);
1780 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
1781 (bfd *, bfd *);
1782
1783 extern bfd_boolean bfd_elf64_swap_symbol_in
1784 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1785 extern void bfd_elf64_swap_symbol_out
1786 (bfd *, const Elf_Internal_Sym *, void *, void *);
1787 extern void bfd_elf64_swap_reloc_in
1788 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1789 extern void bfd_elf64_swap_reloc_out
1790 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1791 extern void bfd_elf64_swap_reloca_in
1792 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1793 extern void bfd_elf64_swap_reloca_out
1794 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1795 extern void bfd_elf64_swap_phdr_in
1796 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
1797 extern void bfd_elf64_swap_phdr_out
1798 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
1799 extern void bfd_elf64_swap_dyn_in
1800 (bfd *, const void *, Elf_Internal_Dyn *);
1801 extern void bfd_elf64_swap_dyn_out
1802 (bfd *, const Elf_Internal_Dyn *, void *);
1803 extern long bfd_elf64_slurp_symbol_table
1804 (bfd *, asymbol **, bfd_boolean);
1805 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
1806 (bfd *);
1807 extern int bfd_elf64_write_out_phdrs
1808 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1809 extern void bfd_elf64_write_relocs
1810 (bfd *, asection *, void *);
1811 extern bfd_boolean bfd_elf64_slurp_reloc_table
1812 (bfd *, asection *, asymbol **, bfd_boolean);
1813
1814 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
1815 (bfd *, struct bfd_link_info *, const char *);
1816 extern bfd_boolean bfd_elf_link_add_symbols
1817 (bfd *, struct bfd_link_info *);
1818 extern bfd_boolean _bfd_elf_add_dynamic_entry
1819 (struct bfd_link_info *, bfd_vma, bfd_vma);
1820
1821 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
1822 (struct bfd_link_info *, struct elf_link_hash_entry *);
1823
1824 extern int bfd_elf_link_record_local_dynamic_symbol
1825 (struct bfd_link_info *, bfd *, long);
1826
1827 extern void bfd_elf_link_mark_dynamic_symbol
1828 (struct bfd_link_info *, struct elf_link_hash_entry *);
1829
1830 extern bfd_boolean _bfd_elf_close_and_cleanup
1831 (bfd *);
1832
1833 extern bfd_boolean _bfd_elf_common_definition
1834 (Elf_Internal_Sym *);
1835
1836 extern unsigned int _bfd_elf_common_section_index
1837 (asection *);
1838
1839 extern asection *_bfd_elf_common_section
1840 (asection *);
1841
1842 extern void _bfd_dwarf2_cleanup_debug_info
1843 (bfd *);
1844
1845 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
1846 (bfd *, arelent *, struct bfd_symbol *, void *,
1847 asection *, bfd *, char **);
1848
1849 extern bfd_boolean bfd_elf_final_link
1850 (bfd *, struct bfd_link_info *);
1851
1852 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
1853 (struct elf_link_hash_entry *h, void *inf);
1854
1855 extern bfd_boolean bfd_elf_gc_sections
1856 (bfd *, struct bfd_link_info *);
1857
1858 extern bfd_boolean bfd_elf_gc_record_vtinherit
1859 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1860
1861 extern bfd_boolean bfd_elf_gc_record_vtentry
1862 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1863
1864 extern asection *_bfd_elf_gc_mark_hook
1865 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
1866 struct elf_link_hash_entry *, Elf_Internal_Sym *);
1867
1868 extern bfd_boolean _bfd_elf_gc_mark
1869 (struct bfd_link_info *, asection *,
1870 asection * (*) (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
1871 struct elf_link_hash_entry *, Elf_Internal_Sym *));
1872
1873 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
1874 (bfd *, struct bfd_link_info *);
1875
1876 extern bfd_boolean bfd_elf_gc_common_final_link
1877 (bfd *, struct bfd_link_info *);
1878
1879 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
1880 (bfd_vma, void *);
1881
1882 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
1883 (bfd *, asection *);
1884
1885 extern bfd_boolean _bfd_elf_map_sections_to_segments
1886 (bfd *, struct bfd_link_info *);
1887
1888 /* Exported interface for writing elf corefile notes. */
1889 extern char *elfcore_write_note
1890 (bfd *, char *, int *, const char *, int, const void *, int);
1891 extern char *elfcore_write_prpsinfo
1892 (bfd *, char *, int *, const char *, const char *);
1893 extern char *elfcore_write_prstatus
1894 (bfd *, char *, int *, long, int, const void *);
1895 extern char * elfcore_write_pstatus
1896 (bfd *, char *, int *, long, int, const void *);
1897 extern char *elfcore_write_prfpreg
1898 (bfd *, char *, int *, const void *, int);
1899 extern char *elfcore_write_prxfpreg
1900 (bfd *, char *, int *, const void *, int);
1901 extern char *elfcore_write_lwpstatus
1902 (bfd *, char *, int *, long, int, const void *);
1903
1904 extern bfd *_bfd_elf32_bfd_from_remote_memory
1905 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1906 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
1907 extern bfd *_bfd_elf64_bfd_from_remote_memory
1908 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1909 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
1910
1911 /* Large common section. */
1912 extern asection _bfd_elf_large_com_section;
1913
1914 /* SH ELF specific routine. */
1915
1916 extern bfd_boolean _sh_elf_set_mach_from_flags
1917 (bfd *);
1918
1919 /* This is the condition under which finish_dynamic_symbol will be called.
1920 If our finish_dynamic_symbol isn't called, we'll need to do something
1921 about initializing any .plt and .got entries in relocate_section. */
1922 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1923 ((DYN) \
1924 && ((SHARED) || !(H)->forced_local) \
1925 && ((H)->dynindx != -1 || (H)->forced_local))
1926
1927 /* This macro is to avoid lots of duplicated code in the body
1928 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
1929 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
1930 r_symndx, symtab_hdr, sym_hashes, \
1931 h, sec, relocation, \
1932 unresolved_reloc, warned) \
1933 do \
1934 { \
1935 /* It seems this can happen with erroneous or unsupported \
1936 input (mixing a.out and elf in an archive, for example.) */ \
1937 if (sym_hashes == NULL) \
1938 return FALSE; \
1939 \
1940 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
1941 \
1942 while (h->root.type == bfd_link_hash_indirect \
1943 || h->root.type == bfd_link_hash_warning) \
1944 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
1945 \
1946 warned = FALSE; \
1947 unresolved_reloc = FALSE; \
1948 relocation = 0; \
1949 if (h->root.type == bfd_link_hash_defined \
1950 || h->root.type == bfd_link_hash_defweak) \
1951 { \
1952 sec = h->root.u.def.section; \
1953 if (sec == NULL \
1954 || sec->output_section == NULL) \
1955 /* Set a flag that will be cleared later if we find a \
1956 relocation value for this symbol. output_section \
1957 is typically NULL for symbols satisfied by a shared \
1958 library. */ \
1959 unresolved_reloc = TRUE; \
1960 else \
1961 relocation = (h->root.u.def.value \
1962 + sec->output_section->vma \
1963 + sec->output_offset); \
1964 } \
1965 else if (h->root.type == bfd_link_hash_undefweak) \
1966 ; \
1967 else if (info->unresolved_syms_in_objects == RM_IGNORE \
1968 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
1969 ; \
1970 else \
1971 { \
1972 bfd_boolean err; \
1973 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
1974 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
1975 if (!info->callbacks->undefined_symbol (info, \
1976 h->root.root.string, \
1977 input_bfd, \
1978 input_section, \
1979 rel->r_offset, err)) \
1980 return FALSE; \
1981 warned = TRUE; \
1982 } \
1983 } \
1984 while (0)
1985
1986 /* Will a symbol be bound to the the definition within the shared
1987 library, if any. */
1988 #define SYMBOLIC_BIND(INFO, H) \
1989 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
1990
1991 #endif /* _LIBELF_H_ */
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