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, 2007 Free Software Foundation, Inc.
4 Written by Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
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 3 of the License, or
11 (at your option) any later version.
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.
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,
21 MA 02110-1301, USA. */
26 #include "elf/common.h"
27 #include "elf/internal.h"
28 #include "elf/external.h"
31 /* The number of entries in a section is its size divided by the size
32 of a single entry. This is normally only applicable to reloc and
33 symbol table sections. */
34 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize)
36 /* If size isn't specified as 64 or 32, NAME macro should fail. */
39 #define NAME(x, y) x ## 64 ## _ ## y
42 #define NAME(x, y) x ## 32 ## _ ## y
47 #define NAME(x, y) x ## NOSIZE ## _ ## y
50 #define ElfNAME(X) NAME(Elf,X)
51 #define elfNAME(X) NAME(elf,X)
53 /* Information held for an ELF symbol. The first field is the
54 corresponding asymbol. Every symbol is an ELF file is actually a
55 pointer to this structure, although it is often handled as a
56 pointer to an asymbol. */
62 /* ELF symbol information. */
63 Elf_Internal_Sym internal_elf_sym
;
64 /* Backend specific information. */
67 unsigned int hppa_arg_reloc
;
73 /* Version information. This is from an Elf_Internal_Versym
74 structure in a SHT_GNU_versym section. It is zero if there is no
75 version information. */
76 unsigned short version
;
80 struct elf_strtab_hash
;
84 /* ELF linker hash table entries. */
86 struct elf_link_hash_entry
88 struct bfd_link_hash_entry root
;
90 /* Symbol index in output file. This is initialized to -1. It is
91 set to -2 if the symbol is used by a reloc. */
94 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
95 -1 if this is not a dynamic symbol. */
96 /* ??? Note that this is consistently used as a synonym for tests
97 against whether we can perform various simplifying transformations
98 to the code. (E.g. changing a pc-relative jump to a PLT entry
99 into a pc-relative jump to the target function.) That test, which
100 is often relatively complex, and someplaces wrong or incomplete,
101 should really be replaced by a predicate in elflink.c.
103 End result: this field -1 does not indicate that the symbol is
104 not in the dynamic symbol table, but rather that the symbol is
105 not visible outside this DSO. */
108 /* If this symbol requires an entry in the global offset table, the
109 processor specific backend uses this field to track usage and
110 final offset. Two schemes are supported: The first assumes that
111 a symbol may only have one GOT entry, and uses REFCOUNT until
112 size_dynamic_sections, at which point the contents of the .got is
113 fixed. Afterward, if OFFSET is -1, then the symbol does not
114 require a global offset table entry. The second scheme allows
115 multiple GOT entries per symbol, managed via a linked list
116 pointed to by GLIST. */
119 bfd_signed_vma refcount
;
121 struct got_entry
*glist
;
122 struct plt_entry
*plist
;
125 /* Same, but tracks a procedure linkage table entry. */
126 union gotplt_union plt
;
131 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
132 unsigned int type
: 8;
134 /* Symbol st_other value, symbol visibility. */
135 unsigned int other
: 8;
137 /* Symbol is referenced by a non-shared object. */
138 unsigned int ref_regular
: 1;
139 /* Symbol is defined by a non-shared object. */
140 unsigned int def_regular
: 1;
141 /* Symbol is referenced by a shared object. */
142 unsigned int ref_dynamic
: 1;
143 /* Symbol is defined by a shared object. */
144 unsigned int def_dynamic
: 1;
145 /* Symbol has a non-weak reference from a non-shared object. */
146 unsigned int ref_regular_nonweak
: 1;
147 /* Dynamic symbol has been adjustd. */
148 unsigned int dynamic_adjusted
: 1;
149 /* Symbol needs a copy reloc. */
150 unsigned int needs_copy
: 1;
151 /* Symbol needs a procedure linkage table entry. */
152 unsigned int needs_plt
: 1;
153 /* Symbol appears in a non-ELF input file. */
154 unsigned int non_elf
: 1;
155 /* Symbol should be marked as hidden in the version information. */
156 unsigned int hidden
: 1;
157 /* Symbol was forced to local scope due to a version script file. */
158 unsigned int forced_local
: 1;
159 /* Symbol was forced to be dynamic due to a version script file. */
160 unsigned int dynamic
: 1;
161 /* Symbol was marked during garbage collection. */
162 unsigned int mark
: 1;
163 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
164 not currently set by all the backends. */
165 unsigned int non_got_ref
: 1;
166 /* Symbol has a definition in a shared object.
167 FIXME: There is no real need for this field if def_dynamic is never
168 cleared and all places that test def_dynamic also test def_regular. */
169 unsigned int dynamic_def
: 1;
170 /* Symbol is weak in all shared objects. */
171 unsigned int dynamic_weak
: 1;
172 /* Symbol is referenced with a relocation where C/C++ pointer equality
174 unsigned int pointer_equality_needed
: 1;
176 /* String table index in .dynstr if this is a dynamic symbol. */
177 unsigned long dynstr_index
;
181 /* If this is a weak defined symbol from a dynamic object, this
182 field points to a defined symbol with the same value, if there is
183 one. Otherwise it is NULL. */
184 struct elf_link_hash_entry
*weakdef
;
186 /* Hash value of the name computed using the ELF hash function.
187 Used part way through size_dynamic_sections, after we've finished
189 unsigned long elf_hash_value
;
192 /* Version information. */
195 /* This field is used for a symbol which is not defined in a
196 regular object. It points to the version information read in
197 from the dynamic object. */
198 Elf_Internal_Verdef
*verdef
;
199 /* This field is used for a symbol which is defined in a regular
200 object. It is set up in size_dynamic_sections. It points to
201 the version information we should write out for this symbol. */
202 struct bfd_elf_version_tree
*vertree
;
207 /* Virtual table entry use information. This array is nominally of size
208 size/sizeof(target_void_pointer), though we have to be able to assume
209 and track a size while the symbol is still undefined. It is indexed
210 via offset/sizeof(target_void_pointer). */
214 /* Virtual table derivation info. */
215 struct elf_link_hash_entry
*parent
;
219 /* Will references to this symbol always reference the symbol
220 in this object? STV_PROTECTED is excluded from the visibility test
221 here so that function pointer comparisons work properly. Since
222 function symbols not defined in an app are set to their .plt entry,
223 it's necessary for shared libs to also reference the .plt even
224 though the symbol is really local to the shared lib. */
225 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
226 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
228 /* Will _calls_ to this symbol always call the version in this object? */
229 #define SYMBOL_CALLS_LOCAL(INFO, H) \
230 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
232 /* Common symbols that are turned into definitions don't have the
233 DEF_REGULAR flag set, so they might appear to be undefined. */
234 #define ELF_COMMON_DEF_P(H) \
236 && !(H)->def_dynamic \
237 && (H)->root.type == bfd_link_hash_defined)
239 /* Records local symbols to be emitted in the dynamic symbol table. */
241 struct elf_link_local_dynamic_entry
243 struct elf_link_local_dynamic_entry
*next
;
245 /* The input bfd this symbol came from. */
248 /* The index of the local symbol being copied. */
251 /* The index in the outgoing dynamic symbol table. */
254 /* A copy of the input symbol. */
255 Elf_Internal_Sym isym
;
258 struct elf_link_loaded_list
260 struct elf_link_loaded_list
*next
;
264 /* Structures used by the eh_frame optimization code. */
269 /* If REMOVED == 1, this is the CIE that the FDE originally used.
270 The CIE belongs to the same .eh_frame input section as the FDE.
272 If REMOVED == 0, this is the CIE that we have chosen to use for
273 the output FDE. The CIE's REMOVED field is also 0, but the CIE
274 might belong to a different .eh_frame input section from the FDE. */
275 struct eh_cie_fde
*cie_inf
;
278 /* In general, equivalent CIEs are grouped together, with one CIE
279 representing all the others in a group. If REMOVED == 0,
280 this CIE is the group representative. If REMOVED == 1,
281 following this pointer brings us "closer" to the CIE's group
282 representative, and reapplying always gives the representative. */
283 struct eh_cie_fde
*merged
;
286 unsigned int reloc_index
;
289 unsigned int new_offset
;
290 unsigned int fde_encoding
: 8;
291 unsigned int lsda_encoding
: 8;
292 unsigned int lsda_offset
: 8;
293 unsigned int cie
: 1;
294 unsigned int removed
: 1;
295 unsigned int add_augmentation_size
: 1;
296 unsigned int add_fde_encoding
: 1;
297 unsigned int make_relative
: 1;
298 unsigned int make_lsda_relative
: 1;
299 unsigned int need_lsda_relative
: 1;
300 unsigned int per_encoding_relative
: 1;
301 unsigned int *set_loc
;
304 struct eh_frame_sec_info
307 struct eh_cie_fde entry
[1];
310 struct eh_frame_array_ent
318 struct eh_frame_hdr_info
322 unsigned int fde_count
, array_count
;
323 struct eh_frame_array_ent
*array
;
324 /* TRUE if all .eh_frames have been parsd. */
325 bfd_boolean parsed_eh_frames
;
326 /* TRUE if .eh_frame_hdr should contain the sorted search table.
327 We build it if we successfully read all .eh_frame input sections
328 and recognize them. */
330 bfd_boolean offsets_adjusted
;
333 /* ELF linker hash table. */
335 struct elf_link_hash_table
337 struct bfd_link_hash_table root
;
339 /* Whether we have created the special dynamic sections required
340 when linking against or generating a shared object. */
341 bfd_boolean dynamic_sections_created
;
343 /* True if this target has relocatable executables, so needs dynamic
345 bfd_boolean is_relocatable_executable
;
347 /* The BFD used to hold special sections created by the linker.
348 This will be the first BFD found which requires these sections to
352 /* The value to use when initialising got.refcount/offset and
353 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
354 the values are refcounts. Set to init_got_offset/init_plt_offset
355 in size_dynamic_sections when the values may be offsets. */
356 union gotplt_union init_got_refcount
;
357 union gotplt_union init_plt_refcount
;
359 /* The value to use for got.refcount/offset and plt.refcount/offset
360 when the values may be offsets. Normally (bfd_vma) -1. */
361 union gotplt_union init_got_offset
;
362 union gotplt_union init_plt_offset
;
364 /* The number of symbols found in the link which must be put into
365 the .dynsym section. */
366 bfd_size_type dynsymcount
;
368 /* The string table of dynamic symbols, which becomes the .dynstr
370 struct elf_strtab_hash
*dynstr
;
372 /* The number of buckets in the hash table in the .hash section.
373 This is based on the number of dynamic symbols. */
374 bfd_size_type bucketcount
;
376 /* A linked list of DT_NEEDED names found in dynamic objects
377 included in the link. */
378 struct bfd_link_needed_list
*needed
;
380 /* Sections in the output bfd that provides a section symbol
381 to be used by relocations emitted against local symbols.
382 Most targets will not use data_index_section. */
383 asection
*text_index_section
;
384 asection
*data_index_section
;
386 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
387 struct elf_link_hash_entry
*hgot
;
389 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
390 struct elf_link_hash_entry
*hplt
;
392 /* A pointer to information used to merge SEC_MERGE sections. */
395 /* Used to link stabs in sections. */
396 struct stab_info stab_info
;
398 /* Used by eh_frame code when editing .eh_frame. */
399 struct eh_frame_hdr_info eh_info
;
401 /* A linked list of local symbols to be added to .dynsym. */
402 struct elf_link_local_dynamic_entry
*dynlocal
;
404 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
405 objects included in the link. */
406 struct bfd_link_needed_list
*runpath
;
408 /* Cached first output tls section and size of PT_TLS segment. */
410 bfd_size_type tls_size
;
412 /* A linked list of BFD's loaded in the link. */
413 struct elf_link_loaded_list
*loaded
;
416 /* Look up an entry in an ELF linker hash table. */
418 #define elf_link_hash_lookup(table, string, create, copy, follow) \
419 ((struct elf_link_hash_entry *) \
420 bfd_link_hash_lookup (&(table)->root, (string), (create), \
423 /* Traverse an ELF linker hash table. */
425 #define elf_link_hash_traverse(table, func, info) \
426 (bfd_link_hash_traverse \
428 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
431 /* Get the ELF linker hash table from a link_info structure. */
433 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
435 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
436 #define is_elf_hash_table(htab) \
437 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
439 /* Used by bfd_section_from_r_symndx to cache a small number of local
440 symbol to section mappings. */
441 #define LOCAL_SYM_CACHE_SIZE 32
445 unsigned long indx
[LOCAL_SYM_CACHE_SIZE
];
446 unsigned int shndx
[LOCAL_SYM_CACHE_SIZE
];
449 /* Constant information held for an ELF backend. */
451 struct elf_size_info
{
452 unsigned char sizeof_ehdr
, sizeof_phdr
, sizeof_shdr
;
453 unsigned char sizeof_rel
, sizeof_rela
, sizeof_sym
, sizeof_dyn
, sizeof_note
;
455 /* The size of entries in the .hash section. */
456 unsigned char sizeof_hash_entry
;
458 /* The number of internal relocations to allocate per external
460 unsigned char int_rels_per_ext_rel
;
461 /* We use some fixed size arrays. This should be large enough to
462 handle all back-ends. */
463 #define MAX_INT_RELS_PER_EXT_REL 3
465 unsigned char arch_size
, log_file_align
;
466 unsigned char elfclass
, ev_current
;
467 int (*write_out_phdrs
)
468 (bfd
*, const Elf_Internal_Phdr
*, unsigned int);
470 (*write_shdrs_and_ehdr
) (bfd
*);
471 bfd_boolean (*checksum_contents
)
472 (bfd
* , void (*) (const void *, size_t, void *), void *);
474 (bfd
*, asection
*, void *);
475 bfd_boolean (*swap_symbol_in
)
476 (bfd
*, const void *, const void *, Elf_Internal_Sym
*);
477 void (*swap_symbol_out
)
478 (bfd
*, const Elf_Internal_Sym
*, void *, void *);
479 bfd_boolean (*slurp_reloc_table
)
480 (bfd
*, asection
*, asymbol
**, bfd_boolean
);
481 long (*slurp_symbol_table
)
482 (bfd
*, asymbol
**, bfd_boolean
);
484 (bfd
*, const void *, Elf_Internal_Dyn
*);
486 (bfd
*, const Elf_Internal_Dyn
*, void *);
488 /* This function is called to swap in a REL relocation. If an
489 external relocation corresponds to more than one internal
490 relocation, then all relocations are swapped in at once. */
491 void (*swap_reloc_in
)
492 (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
494 /* This function is called to swap out a REL relocation. */
495 void (*swap_reloc_out
)
496 (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
498 /* This function is called to swap in a RELA relocation. If an
499 external relocation corresponds to more than one internal
500 relocation, then all relocations are swapped in at once. */
501 void (*swap_reloca_in
)
502 (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
504 /* This function is called to swap out a RELA relocation. */
505 void (*swap_reloca_out
)
506 (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
509 #define elf_symbol_from(ABFD,S) \
510 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
511 && (S)->the_bfd->tdata.elf_obj_data != 0) \
512 ? (elf_symbol_type *) (S) \
515 enum elf_reloc_type_class
{
517 reloc_class_relative
,
522 struct elf_reloc_cookie
524 Elf_Internal_Rela
*rels
, *rel
, *relend
;
525 Elf_Internal_Sym
*locsyms
;
529 struct elf_link_hash_entry
**sym_hashes
;
531 bfd_boolean bad_symtab
;
534 /* The level of IRIX compatibility we're striving for. */
542 /* Mapping of ELF section names and types. */
543 struct bfd_elf_special_section
547 /* 0 means name must match PREFIX exactly.
548 -1 means name must start with PREFIX followed by an arbitrary string.
549 -2 means name must match PREFIX exactly or consist of PREFIX followed
550 by a dot then anything.
551 > 0 means name must start with the first PREFIX_LENGTH chars of
552 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
558 enum action_discarded
564 typedef asection
* (*elf_gc_mark_hook_fn
)
565 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
566 struct elf_link_hash_entry
*, Elf_Internal_Sym
*);
568 struct elf_backend_data
570 /* The architecture for this backend. */
571 enum bfd_architecture arch
;
573 /* The ELF machine code (EM_xxxx) for this backend. */
574 int elf_machine_code
;
579 /* The maximum page size for this backend. */
582 /* The minimum page size for this backend. An input object will not be
583 considered page aligned unless its sections are correctly aligned for
584 pages at least this large. May be smaller than maxpagesize. */
587 /* The common page size for this backend. */
588 bfd_vma commonpagesize
;
590 /* The BFD flags applied to sections created for dynamic linking. */
591 flagword dynamic_sec_flags
;
593 /* A function to translate an ELF RELA relocation to a BFD arelent
595 void (*elf_info_to_howto
)
596 (bfd
*, arelent
*, Elf_Internal_Rela
*);
598 /* A function to translate an ELF REL relocation to a BFD arelent
600 void (*elf_info_to_howto_rel
)
601 (bfd
*, arelent
*, Elf_Internal_Rela
*);
603 /* A function to determine whether a symbol is global when
604 partitioning the symbol table into local and global symbols.
605 This should be NULL for most targets, in which case the correct
606 thing will be done. MIPS ELF, at least on the Irix 5, has
607 special requirements. */
608 bfd_boolean (*elf_backend_sym_is_global
)
611 /* The remaining functions are hooks which are called only if they
614 /* A function to permit a backend specific check on whether a
615 particular BFD format is relevant for an object file, and to
616 permit the backend to set any global information it wishes. When
617 this is called elf_elfheader is set, but anything else should be
618 used with caution. If this returns FALSE, the check_format
619 routine will return a bfd_error_wrong_format error. */
620 bfd_boolean (*elf_backend_object_p
)
623 /* A function to do additional symbol processing when reading the
624 ELF symbol table. This is where any processor-specific special
625 section indices are handled. */
626 void (*elf_backend_symbol_processing
)
629 /* A function to do additional symbol processing after reading the
630 entire ELF symbol table. */
631 bfd_boolean (*elf_backend_symbol_table_processing
)
632 (bfd
*, elf_symbol_type
*, unsigned int);
634 /* A function to set the type of the info field. Processor-specific
635 types should be handled here. */
636 int (*elf_backend_get_symbol_type
)
637 (Elf_Internal_Sym
*, int);
639 /* A function to return the linker hash table entry of a symbol that
640 might be satisfied by an archive symbol. */
641 struct elf_link_hash_entry
* (*elf_backend_archive_symbol_lookup
)
642 (bfd
*, struct bfd_link_info
*, const char *);
644 /* Return true if local section symbols should have a non-null st_name.
645 NULL implies false. */
646 bfd_boolean (*elf_backend_name_local_section_symbols
)
649 /* A function to do additional processing on the ELF section header
650 just before writing it out. This is used to set the flags and
651 type fields for some sections, or to actually write out data for
653 bfd_boolean (*elf_backend_section_processing
)
654 (bfd
*, Elf_Internal_Shdr
*);
656 /* A function to handle unusual section types when creating BFD
657 sections from ELF sections. */
658 bfd_boolean (*elf_backend_section_from_shdr
)
659 (bfd
*, Elf_Internal_Shdr
*, const char *, int);
661 /* A function to convert machine dependent ELF section header flags to
662 BFD internal section header flags. */
663 bfd_boolean (*elf_backend_section_flags
)
664 (flagword
*, const Elf_Internal_Shdr
*);
666 /* A function that returns a struct containing ELF section flags and
667 type for the given BFD section. */
668 const struct bfd_elf_special_section
* (*get_sec_type_attr
)
671 /* A function to handle unusual program segment types when creating BFD
672 sections from ELF program segments. */
673 bfd_boolean (*elf_backend_section_from_phdr
)
674 (bfd
*, Elf_Internal_Phdr
*, int, const char *);
676 /* A function to set up the ELF section header for a BFD section in
677 preparation for writing it out. This is where the flags and type
678 fields are set for unusual sections. */
679 bfd_boolean (*elf_backend_fake_sections
)
680 (bfd
*, Elf_Internal_Shdr
*, asection
*);
682 /* A function to get the ELF section index for a BFD section. If
683 this returns TRUE, the section was found. If it is a normal ELF
684 section, *RETVAL should be left unchanged. If it is not a normal
685 ELF section *RETVAL should be set to the SHN_xxxx index. */
686 bfd_boolean (*elf_backend_section_from_bfd_section
)
687 (bfd
*, asection
*, int *retval
);
689 /* If this field is not NULL, it is called by the add_symbols phase
690 of a link just before adding a symbol to the global linker hash
691 table. It may modify any of the fields as it wishes. If *NAME
692 is set to NULL, the symbol will be skipped rather than being
693 added to the hash table. This function is responsible for
694 handling all processor dependent symbol bindings and section
695 indices, and must set at least *FLAGS and *SEC for each processor
696 dependent case; failure to do so will cause a link error. */
697 bfd_boolean (*elf_add_symbol_hook
)
698 (bfd
*abfd
, struct bfd_link_info
*info
, Elf_Internal_Sym
*,
699 const char **name
, flagword
*flags
, asection
**sec
, bfd_vma
*value
);
701 /* If this field is not NULL, it is called by the elf_link_output_sym
702 phase of a link for each symbol which will appear in the object file. */
703 bfd_boolean (*elf_backend_link_output_symbol_hook
)
704 (struct bfd_link_info
*info
, const char *, Elf_Internal_Sym
*,
705 asection
*, struct elf_link_hash_entry
*);
707 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
708 linker the first time it encounters a dynamic object in the link.
709 This function must create any sections required for dynamic
710 linking. The ABFD argument is a dynamic object. The .interp,
711 .dynamic, .dynsym, .dynstr, and .hash functions have already been
712 created, and this function may modify the section flags if
713 desired. This function will normally create the .got and .plt
714 sections, but different backends have different requirements. */
715 bfd_boolean (*elf_backend_create_dynamic_sections
)
716 (bfd
*abfd
, struct bfd_link_info
*info
);
718 /* When creating a shared library, determine whether to omit the
719 dynamic symbol for the section. */
720 bfd_boolean (*elf_backend_omit_section_dynsym
)
721 (bfd
*output_bfd
, struct bfd_link_info
*info
, asection
*osec
);
723 /* Return TRUE if relocations of targets are compatible to the extent
724 that CHECK_RELOCS will properly process them. PR 4424. */
725 bfd_boolean (*relocs_compatible
) (const bfd_target
*, const bfd_target
*);
727 /* The CHECK_RELOCS function is called by the add_symbols phase of
728 the ELF backend linker. It is called once for each section with
729 relocs of an object file, just after the symbols for the object
730 file have been added to the global linker hash table. The
731 function must look through the relocs and do any special handling
732 required. This generally means allocating space in the global
733 offset table, and perhaps allocating space for a reloc. The
734 relocs are always passed as Rela structures; if the section
735 actually uses Rel structures, the r_addend field will always be
737 bfd_boolean (*check_relocs
)
738 (bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
739 const Elf_Internal_Rela
*relocs
);
741 /* The CHECK_DIRECTIVES function is called once per input file by
742 the add_symbols phase of the ELF backend linker. The function
743 must inspect the bfd and create any additional symbols according
744 to any custom directives in the bfd. */
745 bfd_boolean (*check_directives
)
746 (bfd
*abfd
, struct bfd_link_info
*info
);
748 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
749 input file that was not needed by the add_symbols phase of the
750 ELF backend linker. The function must undo any target specific
751 changes in the symbol hash table. */
752 bfd_boolean (*as_needed_cleanup
)
753 (bfd
*abfd
, struct bfd_link_info
*info
);
755 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
756 linker for every symbol which is defined by a dynamic object and
757 referenced by a regular object. This is called after all the
758 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
759 function has been called. The hash table entry should be
760 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
761 defined in a section from a dynamic object. Dynamic object
762 sections are not included in the final link, and this function is
763 responsible for changing the value to something which the rest of
764 the link can deal with. This will normally involve adding an
765 entry to the .plt or .got or some such section, and setting the
766 symbol to point to that. */
767 bfd_boolean (*elf_backend_adjust_dynamic_symbol
)
768 (struct bfd_link_info
*info
, struct elf_link_hash_entry
*h
);
770 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
771 after all the linker input files have been seen but before the
772 section sizes have been set. This is called after
773 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
774 bfd_boolean (*elf_backend_always_size_sections
)
775 (bfd
*output_bfd
, struct bfd_link_info
*info
);
777 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
778 linker after all the linker input files have been seen but before
779 the sections sizes have been set. This is called after
780 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
781 It is only called when linking against a dynamic object. It must
782 set the sizes of the dynamic sections, and may fill in their
783 contents as well. The generic ELF linker can handle the .dynsym,
784 .dynstr and .hash sections. This function must handle the
785 .interp section and any sections created by the
786 CREATE_DYNAMIC_SECTIONS entry point. */
787 bfd_boolean (*elf_backend_size_dynamic_sections
)
788 (bfd
*output_bfd
, struct bfd_link_info
*info
);
790 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
791 we keep to use as a base for relocs and symbols. */
792 void (*elf_backend_init_index_section
)
793 (bfd
*output_bfd
, struct bfd_link_info
*info
);
795 /* The RELOCATE_SECTION function is called by the ELF backend linker
796 to handle the relocations for a section.
798 The relocs are always passed as Rela structures; if the section
799 actually uses Rel structures, the r_addend field will always be
802 This function is responsible for adjust the section contents as
803 necessary, and (if using Rela relocs and generating a
804 relocatable output file) adjusting the reloc addend as
807 This function does not have to worry about setting the reloc
808 address or the reloc symbol index.
810 LOCAL_SYMS is a pointer to the swapped in local symbols.
812 LOCAL_SECTIONS is an array giving the section in the input file
813 corresponding to the st_shndx field of each local symbol.
815 The global hash table entry for the global symbols can be found
816 via elf_sym_hashes (input_bfd).
818 When generating relocatable output, this function must handle
819 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
820 going to be the section symbol corresponding to the output
821 section, which means that the addend must be adjusted
824 Returns FALSE on error, TRUE on success, 2 if successful and
825 relocations should be written for this section. */
826 int (*elf_backend_relocate_section
)
827 (bfd
*output_bfd
, struct bfd_link_info
*info
, bfd
*input_bfd
,
828 asection
*input_section
, bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
829 Elf_Internal_Sym
*local_syms
, asection
**local_sections
);
831 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
832 linker just before it writes a symbol out to the .dynsym section.
833 The processor backend may make any required adjustment to the
834 symbol. It may also take the opportunity to set contents of the
835 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
836 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
837 on those symbols which are defined by a dynamic object. */
838 bfd_boolean (*elf_backend_finish_dynamic_symbol
)
839 (bfd
*output_bfd
, struct bfd_link_info
*info
,
840 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*sym
);
842 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
843 linker just before it writes all the dynamic sections out to the
844 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
845 all dynamic symbols. */
846 bfd_boolean (*elf_backend_finish_dynamic_sections
)
847 (bfd
*output_bfd
, struct bfd_link_info
*info
);
849 /* A function to do any beginning processing needed for the ELF file
850 before building the ELF headers and computing file positions. */
851 void (*elf_backend_begin_write_processing
)
852 (bfd
*, struct bfd_link_info
*);
854 /* A function to do any final processing needed for the ELF file
855 before writing it out. The LINKER argument is TRUE if this BFD
856 was created by the ELF backend linker. */
857 void (*elf_backend_final_write_processing
)
858 (bfd
*, bfd_boolean linker
);
860 /* This function is called by get_program_header_size. It should
861 return the number of additional program segments which this BFD
862 will need. It should return -1 on error. */
863 int (*elf_backend_additional_program_headers
)
864 (bfd
*, struct bfd_link_info
*);
866 /* This function is called to modify an existing segment map in a
867 backend specific fashion. */
868 bfd_boolean (*elf_backend_modify_segment_map
)
869 (bfd
*, struct bfd_link_info
*);
871 /* This function is called to modify program headers just before
873 bfd_boolean (*elf_backend_modify_program_headers
)
874 (bfd
*, struct bfd_link_info
*);
876 /* This function is called during section garbage collection to
877 mark sections that define global symbols. */
878 bfd_boolean (*gc_mark_dynamic_ref
)
879 (struct elf_link_hash_entry
*h
, void *inf
);
881 /* This function is called during section gc to discover the section a
882 particular relocation refers to. */
883 elf_gc_mark_hook_fn gc_mark_hook
;
885 /* This function, if defined, is called after the first gc marking pass
886 to allow the backend to mark additional sections. */
887 bfd_boolean (*gc_mark_extra_sections
)
888 (struct bfd_link_info
*info
, elf_gc_mark_hook_fn gc_mark_hook
);
890 /* This function, if defined, is called during the sweep phase of gc
891 in order that a backend might update any data structures it might
893 bfd_boolean (*gc_sweep_hook
)
894 (bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
895 const Elf_Internal_Rela
*relocs
);
897 /* This function, if defined, is called after the ELF headers have
898 been created. This allows for things like the OS and ABI versions
900 void (*elf_backend_post_process_headers
)
901 (bfd
*, struct bfd_link_info
*);
903 /* This function, if defined, prints a symbol to file and returns the
904 name of the symbol to be printed. It should return NULL to fall
905 back to default symbol printing. */
906 const char *(*elf_backend_print_symbol_all
)
907 (bfd
*, void *, asymbol
*);
909 /* This function, if defined, is called after all local symbols and
910 global symbols converted to locals are emitted into the symtab
911 section. It allows the backend to emit special local symbols
912 not handled in the hash table. */
913 bfd_boolean (*elf_backend_output_arch_local_syms
)
914 (bfd
*, struct bfd_link_info
*, void *,
915 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym
*, asection
*,
916 struct elf_link_hash_entry
*));
918 /* This function, if defined, is called after all symbols are emitted
919 into the symtab section. It allows the backend to emit special
920 global symbols not handled in the hash table. */
921 bfd_boolean (*elf_backend_output_arch_syms
)
922 (bfd
*, struct bfd_link_info
*, void *,
923 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym
*, asection
*,
924 struct elf_link_hash_entry
*));
926 /* Copy any information related to dynamic linking from a pre-existing
927 symbol to a newly created symbol. Also called to copy flags and
928 other back-end info to a weakdef, in which case the symbol is not
929 newly created and plt/got refcounts and dynamic indices should not
931 void (*elf_backend_copy_indirect_symbol
)
932 (struct bfd_link_info
*, struct elf_link_hash_entry
*,
933 struct elf_link_hash_entry
*);
935 /* Modify any information related to dynamic linking such that the
936 symbol is not exported. */
937 void (*elf_backend_hide_symbol
)
938 (struct bfd_link_info
*, struct elf_link_hash_entry
*, bfd_boolean
);
940 /* A function to do additional symbol fixup, called by
941 _bfd_elf_fix_symbol_flags. */
942 bfd_boolean (*elf_backend_fixup_symbol
)
943 (struct bfd_link_info
*, struct elf_link_hash_entry
*);
945 /* Merge the backend specific symbol attribute. */
946 void (*elf_backend_merge_symbol_attribute
)
947 (struct elf_link_hash_entry
*, const Elf_Internal_Sym
*, bfd_boolean
,
950 /* Decide whether an undefined symbol is special and can be ignored.
951 This is the case for OPTIONAL symbols on IRIX. */
952 bfd_boolean (*elf_backend_ignore_undef_symbol
)
953 (struct elf_link_hash_entry
*);
955 /* Emit relocations. Overrides default routine for emitting relocs,
956 except during a relocatable link, or if all relocs are being emitted. */
957 bfd_boolean (*elf_backend_emit_relocs
)
958 (bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*,
959 struct elf_link_hash_entry
**);
961 /* Count relocations. Not called for relocatable links
962 or if all relocs are being preserved in the output. */
963 unsigned int (*elf_backend_count_relocs
)
964 (asection
*, Elf_Internal_Rela
*);
966 /* This function, if defined, is called when an NT_PRSTATUS note is found
968 bfd_boolean (*elf_backend_grok_prstatus
)
969 (bfd
*, Elf_Internal_Note
*);
971 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
972 note is found in a core file. */
973 bfd_boolean (*elf_backend_grok_psinfo
)
974 (bfd
*, Elf_Internal_Note
*);
976 /* This function, if defined, is called to write a note to a corefile. */
977 char *(*elf_backend_write_core_note
)
978 (bfd
*abfd
, char *buf
, int *bufsiz
, int note_type
, ...);
980 /* This function returns class of a reloc type. */
981 enum elf_reloc_type_class (*elf_backend_reloc_type_class
)
982 (const Elf_Internal_Rela
*);
984 /* This function, if defined, removes information about discarded functions
985 from other sections which mention them. */
986 bfd_boolean (*elf_backend_discard_info
)
987 (bfd
*, struct elf_reloc_cookie
*, struct bfd_link_info
*);
989 /* This function, if defined, signals that the function above has removed
990 the discarded relocations for this section. */
991 bfd_boolean (*elf_backend_ignore_discarded_relocs
)
994 /* What to do when ld finds relocations against symbols defined in
995 discarded sections. */
996 unsigned int (*action_discarded
)
999 /* This function returns the width of FDE pointers in bytes, or 0 if
1000 that can't be determined for some reason. The default definition
1001 goes by the bfd's EI_CLASS. */
1002 unsigned int (*elf_backend_eh_frame_address_size
)
1003 (bfd
*, asection
*);
1005 /* These functions tell elf-eh-frame whether to attempt to turn
1006 absolute or lsda encodings into pc-relative ones. The default
1007 definition enables these transformations. */
1008 bfd_boolean (*elf_backend_can_make_relative_eh_frame
)
1009 (bfd
*, struct bfd_link_info
*, asection
*);
1010 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame
)
1011 (bfd
*, struct bfd_link_info
*, asection
*);
1013 /* This function returns an encoding after computing the encoded
1014 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1015 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1016 The default definition chooses a 32-bit PC-relative encoding. */
1017 bfd_byte (*elf_backend_encode_eh_address
)
1018 (bfd
*abfd
, struct bfd_link_info
*info
,
1019 asection
*osec
, bfd_vma offset
,
1020 asection
*loc_sec
, bfd_vma loc_offset
,
1023 /* This function, if defined, may write out the given section.
1024 Returns TRUE if it did so and FALSE if the caller should. */
1025 bfd_boolean (*elf_backend_write_section
)
1026 (bfd
*, struct bfd_link_info
*, asection
*, bfd_byte
*);
1028 /* The level of IRIX compatibility we're striving for.
1029 MIPS ELF specific function. */
1030 irix_compat_t (*elf_backend_mips_irix_compat
)
1033 reloc_howto_type
*(*elf_backend_mips_rtype_to_howto
)
1034 (unsigned int, bfd_boolean
);
1036 /* The swapping table to use when dealing with ECOFF information.
1037 Used for the MIPS ELF .mdebug section. */
1038 const struct ecoff_debug_swap
*elf_backend_ecoff_debug_swap
;
1040 /* This function implements `bfd_elf_bfd_from_remote_memory';
1041 see elf.c, elfcode.h. */
1042 bfd
*(*elf_backend_bfd_from_remote_memory
)
1043 (bfd
*templ
, bfd_vma ehdr_vma
, bfd_vma
*loadbasep
,
1044 int (*target_read_memory
) (bfd_vma vma
, bfd_byte
*myaddr
, int len
));
1046 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1048 bfd_vma (*plt_sym_val
) (bfd_vma
, const asection
*, const arelent
*);
1050 /* Is symbol defined in common section? */
1051 bfd_boolean (*common_definition
) (Elf_Internal_Sym
*);
1053 /* Return a common section index for section. */
1054 unsigned int (*common_section_index
) (asection
*);
1056 /* Return a common section for section. */
1057 asection
*(*common_section
) (asection
*);
1059 /* Return TRUE if we can merge 2 definitions. */
1060 bfd_boolean (*merge_symbol
) (struct bfd_link_info
*,
1061 struct elf_link_hash_entry
**,
1062 struct elf_link_hash_entry
*,
1063 Elf_Internal_Sym
*, asection
**,
1064 bfd_vma
*, unsigned int *,
1065 bfd_boolean
*, bfd_boolean
*,
1066 bfd_boolean
*, bfd_boolean
*,
1067 bfd_boolean
*, bfd_boolean
*,
1068 bfd_boolean
*, bfd_boolean
*,
1070 bfd_boolean
*, bfd_boolean
*,
1071 bfd_boolean
*, bfd_boolean
*,
1072 bfd
*, asection
**);
1074 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1075 bfd_boolean (*elf_hash_symbol
) (struct elf_link_hash_entry
*);
1077 /* Return TRUE if type is a function symbol type. */
1078 bfd_boolean (*is_function_type
) (unsigned int type
);
1080 /* Used to handle bad SHF_LINK_ORDER input. */
1081 bfd_error_handler_type link_order_error_handler
;
1083 /* Name of the PLT relocation section. */
1084 const char *relplt_name
;
1086 /* Alternate EM_xxxx machine codes for this backend. */
1087 int elf_machine_alt1
;
1088 int elf_machine_alt2
;
1090 const struct elf_size_info
*s
;
1092 /* An array of target specific special sections. */
1093 const struct bfd_elf_special_section
*special_sections
;
1095 /* The size in bytes of the header for the GOT. This includes the
1096 so-called reserved entries on some systems. */
1097 bfd_vma got_header_size
;
1099 /* The vendor name to use for a processor-standard attributes section. */
1100 const char *obj_attrs_vendor
;
1102 /* The section name to use for a processor-standard attributes section. */
1103 const char *obj_attrs_section
;
1105 /* Return 1, 2 or 3 to indicate what type of arguments a
1106 processor-specific tag takes. */
1107 int (*obj_attrs_arg_type
) (int);
1109 /* The section type to use for an attributes section. */
1110 unsigned int obj_attrs_section_type
;
1112 /* This is TRUE if the linker should act like collect and gather
1113 global constructors and destructors by name. This is TRUE for
1114 MIPS ELF because the Irix 5 tools can not handle the .init
1116 unsigned collect
: 1;
1118 /* This is TRUE if the linker should ignore changes to the type of a
1119 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1120 record undefined functions as STT_OBJECT although the definitions
1122 unsigned type_change_ok
: 1;
1124 /* Whether the backend may use REL relocations. (Some backends use
1125 both REL and RELA relocations, and this flag is set for those
1127 unsigned may_use_rel_p
: 1;
1129 /* Whether the backend may use RELA relocations. (Some backends use
1130 both REL and RELA relocations, and this flag is set for those
1132 unsigned may_use_rela_p
: 1;
1134 /* Whether the default relocation type is RELA. If a backend with
1135 this flag set wants REL relocations for a particular section,
1136 it must note that explicitly. Similarly, if this flag is clear,
1137 and the backend wants RELA relocations for a particular
1139 unsigned default_use_rela_p
: 1;
1141 /* Set if RELA relocations for a relocatable link can be handled by
1142 generic code. Backends that set this flag need do nothing in the
1143 backend relocate_section routine for relocatable linking. */
1144 unsigned rela_normal
: 1;
1146 /* TRUE if addresses "naturally" sign extend. This is used when
1147 swapping in from Elf32 when BFD64. */
1148 unsigned sign_extend_vma
: 1;
1150 unsigned want_got_plt
: 1;
1151 unsigned plt_readonly
: 1;
1152 unsigned want_plt_sym
: 1;
1153 unsigned plt_not_loaded
: 1;
1154 unsigned plt_alignment
: 4;
1155 unsigned can_gc_sections
: 1;
1156 unsigned can_refcount
: 1;
1157 unsigned want_got_sym
: 1;
1158 unsigned want_dynbss
: 1;
1160 /* Targets which do not support physical addressing often require
1161 that the p_paddr field in the section header to be set to zero.
1162 This field indicates whether this behavior is required. */
1163 unsigned want_p_paddr_set_to_zero
: 1;
1165 /* True if an object file lacking a .note.GNU-stack section
1166 should be assumed to be requesting exec stack. At least one
1167 other file in the link needs to have a .note.GNU-stack section
1168 for a PT_GNU_STACK segment to be created. */
1169 unsigned default_execstack
: 1;
1172 /* Information stored for each BFD section in an ELF file. This
1173 structure is allocated by elf_new_section_hook. */
1175 struct bfd_elf_section_data
1177 /* The ELF header for this section. */
1178 Elf_Internal_Shdr this_hdr
;
1180 /* The ELF header for the reloc section associated with this
1182 Elf_Internal_Shdr rel_hdr
;
1184 /* If there is a second reloc section associated with this section,
1185 as can happen on Irix 6, this field points to the header. */
1186 Elf_Internal_Shdr
*rel_hdr2
;
1188 /* The number of relocations currently assigned to REL_HDR. */
1189 unsigned int rel_count
;
1191 /* The number of relocations currently assigned to REL_HDR2. */
1192 unsigned int rel_count2
;
1194 /* The ELF section number of this section. */
1197 /* The ELF section number of the reloc section indicated by
1198 REL_HDR if any. Only used for an output file. */
1201 /* The ELF section number of the reloc section indicated by
1202 REL_HDR2 if any. Only used for an output file. */
1205 /* Used by the backend linker when generating a shared library to
1206 record the dynamic symbol index for a section symbol
1207 corresponding to this section. A value of 0 means that there is
1208 no dynamic symbol for this section. */
1211 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1212 asection
*linked_to
;
1214 /* Used by the backend linker to store the symbol hash table entries
1215 associated with relocs against global symbols. */
1216 struct elf_link_hash_entry
**rel_hashes
;
1218 /* A pointer to the swapped relocs. If the section uses REL relocs,
1219 rather than RELA, all the r_addend fields will be zero. This
1220 pointer may be NULL. It is used by the backend linker. */
1221 Elf_Internal_Rela
*relocs
;
1223 /* A pointer to a linked list tracking dynamic relocs copied for
1227 /* A pointer to the bfd section used for dynamic relocs. */
1231 /* Group name, if this section is a member of a group. */
1234 /* Group signature sym, if this is the SHT_GROUP section. */
1235 struct bfd_symbol
*id
;
1238 /* For a member of a group, points to the SHT_GROUP section.
1239 NULL for the SHT_GROUP section itself and non-group sections. */
1240 asection
*sec_group
;
1242 /* A linked list of member sections in the group. Circular when used by
1243 the linker. For the SHT_GROUP section, points at first member. */
1244 asection
*next_in_group
;
1246 /* A pointer used for various section optimizations. */
1250 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1251 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1252 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1253 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1254 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1255 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1256 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1257 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1259 #define xvec_get_elf_backend_data(xvec) \
1260 ((const struct elf_backend_data *) (xvec)->backend_data)
1262 #define get_elf_backend_data(abfd) \
1263 xvec_get_elf_backend_data ((abfd)->xvec)
1265 /* This struct is used to pass information to routines called via
1266 elf_link_hash_traverse which must return failure. */
1268 struct elf_info_failed
1271 struct bfd_link_info
*info
;
1272 struct bfd_elf_version_tree
*verdefs
;
1275 /* This structure is used to pass information to
1276 _bfd_elf_link_assign_sym_version. */
1278 struct elf_assign_sym_version_info
1282 /* General link information. */
1283 struct bfd_link_info
*info
;
1285 struct bfd_elf_version_tree
*verdefs
;
1286 /* Whether we had a failure. */
1290 /* This structure is used to pass information to
1291 _bfd_elf_link_find_version_dependencies. */
1293 struct elf_find_verdep_info
1297 /* General link information. */
1298 struct bfd_link_info
*info
;
1299 /* The number of dependencies. */
1301 /* Whether we had a failure. */
1305 /* The maximum number of known object attributes for any target. */
1306 #define NUM_KNOWN_OBJ_ATTRIBUTES 32
1308 /* The value of an object attribute. type & 1 indicates whether there
1309 is an integer value; type & 2 indicates whether there is a string
1312 typedef struct obj_attribute
1319 typedef struct obj_attribute_list
1321 struct obj_attribute_list
*next
;
1324 } obj_attribute_list
;
1326 /* Object attributes may either be defined by the processor ABI, index
1327 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1328 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1329 #define OBJ_ATTR_PROC 0
1330 #define OBJ_ATTR_GNU 1
1331 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1332 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1334 /* The following object attribute tags are taken as generic, for all
1335 targets and for "gnu" where there is no target standard. */
1342 Tag_compatibility
= 32
1345 /* Some private data is stashed away for future use using the tdata pointer
1346 in the bfd structure. */
1348 struct elf_obj_tdata
1350 Elf_Internal_Ehdr elf_header
[1]; /* Actual data, but ref like ptr */
1351 Elf_Internal_Shdr
**elf_sect_ptr
;
1352 Elf_Internal_Phdr
*phdr
;
1353 struct elf_segment_map
*segment_map
;
1354 struct elf_strtab_hash
*strtab_ptr
;
1357 unsigned int num_elf_sections
; /* elf_sect_ptr size */
1358 int num_section_syms
;
1359 asymbol
**section_syms
; /* STT_SECTION symbols for each section */
1360 Elf_Internal_Shdr symtab_hdr
;
1361 Elf_Internal_Shdr shstrtab_hdr
;
1362 Elf_Internal_Shdr strtab_hdr
;
1363 Elf_Internal_Shdr dynsymtab_hdr
;
1364 Elf_Internal_Shdr dynstrtab_hdr
;
1365 Elf_Internal_Shdr dynversym_hdr
;
1366 Elf_Internal_Shdr dynverref_hdr
;
1367 Elf_Internal_Shdr dynverdef_hdr
;
1368 Elf_Internal_Shdr symtab_shndx_hdr
;
1369 unsigned int symtab_section
, shstrtab_section
;
1370 unsigned int strtab_section
, dynsymtab_section
;
1371 unsigned int symtab_shndx_section
;
1372 unsigned int dynversym_section
, dynverdef_section
, dynverref_section
;
1373 file_ptr next_file_pos
;
1374 bfd_vma gp
; /* The gp value */
1375 unsigned int gp_size
; /* The gp size */
1377 /* Information grabbed from an elf core file. */
1384 /* A mapping from external symbols to entries in the linker hash
1385 table, used when linking. This is indexed by the symbol index
1386 minus the sh_info field of the symbol table header. */
1387 struct elf_link_hash_entry
**sym_hashes
;
1389 /* Track usage and final offsets of GOT entries for local symbols.
1390 This array is indexed by symbol index. Elements are used
1391 identically to "got" in struct elf_link_hash_entry. */
1394 bfd_signed_vma
*refcounts
;
1396 struct got_entry
**ents
;
1399 /* The linker ELF emulation code needs to let the backend ELF linker
1400 know what filename should be used for a dynamic object if the
1401 dynamic object is found using a search. The emulation code then
1402 sometimes needs to know what name was actually used. Until the
1403 file has been added to the linker symbol table, this field holds
1404 the name the linker wants. After it has been added, it holds the
1405 name actually used, which will be the DT_SONAME entry if there is
1407 const char *dt_name
;
1409 /* Records the result of `get_program_header_size'. */
1410 bfd_size_type program_header_size
;
1412 /* Used by find_nearest_line entry point. */
1415 /* Used by MIPS ELF find_nearest_line entry point. The structure
1416 could be included directly in this one, but there's no point to
1417 wasting the memory just for the infrequently called
1418 find_nearest_line. */
1419 struct mips_elf_find_line
*find_line_info
;
1421 /* A place to stash dwarf1 info for this bfd. */
1422 struct dwarf1_debug
*dwarf1_find_line_info
;
1424 /* A place to stash dwarf2 info for this bfd. */
1425 void *dwarf2_find_line_info
;
1427 /* An array of stub sections indexed by symbol number, used by the
1428 MIPS ELF linker. FIXME: We should figure out some way to only
1429 include this field for a MIPS ELF target. */
1430 asection
**local_stubs
;
1431 asection
**local_call_stubs
;
1433 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1435 asection
*eh_frame_hdr
;
1437 Elf_Internal_Shdr
**group_sect_ptr
;
1440 /* Number of symbol version definitions we are about to emit. */
1441 unsigned int cverdefs
;
1443 /* Number of symbol version references we are about to emit. */
1444 unsigned int cverrefs
;
1446 /* Segment flags for the PT_GNU_STACK segment. */
1447 unsigned int stack_flags
;
1449 /* Symbol version definitions in external objects. */
1450 Elf_Internal_Verdef
*verdef
;
1452 /* Symbol version references to external objects. */
1453 Elf_Internal_Verneed
*verref
;
1455 /* The Irix 5 support uses two virtual sections, which represent
1456 text/data symbols defined in dynamic objects. */
1457 asymbol
*elf_data_symbol
;
1458 asymbol
*elf_text_symbol
;
1459 asection
*elf_data_section
;
1460 asection
*elf_text_section
;
1462 /* Whether a dyanmic object was specified normally on the linker
1463 command line, or was specified when --as-needed was in effect,
1464 or was found via a DT_NEEDED entry. */
1465 enum dynamic_lib_link_class dyn_lib_class
;
1467 /* This is set to TRUE if the object was created by the backend
1471 /* Irix 5 often screws up the symbol table, sorting local symbols
1472 after global symbols. This flag is set if the symbol table in
1473 this BFD appears to be screwed up. If it is, we ignore the
1474 sh_info field in the symbol table header, and always read all the
1476 bfd_boolean bad_symtab
;
1478 /* Used to determine if the e_flags field has been initialized */
1479 bfd_boolean flags_init
;
1481 /* Symbol buffer. */
1484 obj_attribute known_obj_attributes
[2][NUM_KNOWN_OBJ_ATTRIBUTES
];
1485 obj_attribute_list
*other_obj_attributes
[2];
1487 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1488 bfd_boolean (*after_write_object_contents
) (bfd
*);
1489 void *after_write_object_contents_info
;
1491 /* NT_GNU_BUILD_ID note type. */
1492 bfd_size_type build_id_size
;
1496 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1497 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1498 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1499 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1500 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1501 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1502 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1503 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1504 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1505 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1506 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1507 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1508 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1509 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1510 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1511 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1512 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1513 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1514 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1515 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1516 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1517 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1518 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1519 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1520 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1521 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1522 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1523 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1524 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1525 #define elf_known_obj_attributes_proc(bfd) \
1526 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1527 #define elf_other_obj_attributes_proc(bfd) \
1528 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1530 extern void _bfd_elf_swap_verdef_in
1531 (bfd
*, const Elf_External_Verdef
*, Elf_Internal_Verdef
*);
1532 extern void _bfd_elf_swap_verdef_out
1533 (bfd
*, const Elf_Internal_Verdef
*, Elf_External_Verdef
*);
1534 extern void _bfd_elf_swap_verdaux_in
1535 (bfd
*, const Elf_External_Verdaux
*, Elf_Internal_Verdaux
*);
1536 extern void _bfd_elf_swap_verdaux_out
1537 (bfd
*, const Elf_Internal_Verdaux
*, Elf_External_Verdaux
*);
1538 extern void _bfd_elf_swap_verneed_in
1539 (bfd
*, const Elf_External_Verneed
*, Elf_Internal_Verneed
*);
1540 extern void _bfd_elf_swap_verneed_out
1541 (bfd
*, const Elf_Internal_Verneed
*, Elf_External_Verneed
*);
1542 extern void _bfd_elf_swap_vernaux_in
1543 (bfd
*, const Elf_External_Vernaux
*, Elf_Internal_Vernaux
*);
1544 extern void _bfd_elf_swap_vernaux_out
1545 (bfd
*, const Elf_Internal_Vernaux
*, Elf_External_Vernaux
*);
1546 extern void _bfd_elf_swap_versym_in
1547 (bfd
*, const Elf_External_Versym
*, Elf_Internal_Versym
*);
1548 extern void _bfd_elf_swap_versym_out
1549 (bfd
*, const Elf_Internal_Versym
*, Elf_External_Versym
*);
1551 extern int _bfd_elf_section_from_bfd_section
1552 (bfd
*, asection
*);
1553 extern char *bfd_elf_string_from_elf_section
1554 (bfd
*, unsigned, unsigned);
1555 extern char *bfd_elf_get_str_section
1557 extern Elf_Internal_Sym
*bfd_elf_get_elf_syms
1558 (bfd
*, Elf_Internal_Shdr
*, size_t, size_t, Elf_Internal_Sym
*, void *,
1559 Elf_External_Sym_Shndx
*);
1560 extern const char *bfd_elf_sym_name
1561 (bfd
*, Elf_Internal_Shdr
*, Elf_Internal_Sym
*, asection
*);
1563 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1565 extern bfd_boolean _bfd_elf_print_private_bfd_data
1567 extern void bfd_elf_print_symbol
1568 (bfd
*, void *, asymbol
*, bfd_print_symbol_type
);
1570 extern unsigned int _bfd_elf_eh_frame_address_size
1571 (bfd
*, asection
*);
1572 extern bfd_byte _bfd_elf_encode_eh_address
1573 (bfd
*abfd
, struct bfd_link_info
*info
, asection
*osec
, bfd_vma offset
,
1574 asection
*loc_sec
, bfd_vma loc_offset
, bfd_vma
*encoded
);
1575 extern bfd_boolean _bfd_elf_can_make_relative
1576 (bfd
*input_bfd
, struct bfd_link_info
*info
, asection
*eh_frame_section
);
1578 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1579 (const Elf_Internal_Rela
*);
1580 extern bfd_vma _bfd_elf_rela_local_sym
1581 (bfd
*, Elf_Internal_Sym
*, asection
**, Elf_Internal_Rela
*);
1582 extern bfd_vma _bfd_elf_rel_local_sym
1583 (bfd
*, Elf_Internal_Sym
*, asection
**, bfd_vma
);
1584 extern bfd_vma _bfd_elf_section_offset
1585 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
);
1587 extern unsigned long bfd_elf_hash
1589 extern unsigned long bfd_elf_gnu_hash
1592 extern bfd_reloc_status_type bfd_elf_generic_reloc
1593 (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
1594 extern bfd_boolean bfd_elf_mkobject
1596 extern bfd_boolean bfd_elf_mkcorefile
1598 extern Elf_Internal_Shdr
*bfd_elf_find_section
1600 extern bfd_boolean _bfd_elf_make_section_from_shdr
1601 (bfd
*, Elf_Internal_Shdr
*, const char *, int);
1602 extern bfd_boolean _bfd_elf_make_section_from_phdr
1603 (bfd
*, Elf_Internal_Phdr
*, int, const char *);
1604 extern struct bfd_hash_entry
*_bfd_elf_link_hash_newfunc
1605 (struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *);
1606 extern struct bfd_link_hash_table
*_bfd_elf_link_hash_table_create
1608 extern void _bfd_elf_link_hash_copy_indirect
1609 (struct bfd_link_info
*, struct elf_link_hash_entry
*,
1610 struct elf_link_hash_entry
*);
1611 extern void _bfd_elf_link_hash_hide_symbol
1612 (struct bfd_link_info
*, struct elf_link_hash_entry
*, bfd_boolean
);
1613 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1614 (struct bfd_link_info
*, struct elf_link_hash_entry
*);
1615 extern bfd_boolean _bfd_elf_link_hash_table_init
1616 (struct elf_link_hash_table
*, bfd
*,
1617 struct bfd_hash_entry
*(*)
1618 (struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *),
1620 extern bfd_boolean _bfd_elf_slurp_version_tables
1621 (bfd
*, bfd_boolean
);
1622 extern bfd_boolean _bfd_elf_merge_sections
1623 (bfd
*, struct bfd_link_info
*);
1624 extern bfd_boolean _bfd_elf_match_sections_by_type
1625 (bfd
*, const asection
*, bfd
*, const asection
*);
1626 extern bfd_boolean bfd_elf_is_group_section
1627 (bfd
*, const struct bfd_section
*);
1628 extern void _bfd_elf_section_already_linked
1629 (bfd
*, struct bfd_section
*, struct bfd_link_info
*);
1630 extern void bfd_elf_set_group_contents
1631 (bfd
*, asection
*, void *);
1632 extern asection
*_bfd_elf_check_kept_section
1633 (asection
*, struct bfd_link_info
*);
1634 extern void _bfd_elf_link_just_syms
1635 (asection
*, struct bfd_link_info
*);
1636 extern bfd_boolean _bfd_elf_copy_private_header_data
1638 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1639 (bfd
*, asymbol
*, bfd
*, asymbol
*);
1640 #define _bfd_generic_init_private_section_data \
1641 _bfd_elf_init_private_section_data
1642 extern bfd_boolean _bfd_elf_init_private_section_data
1643 (bfd
*, asection
*, bfd
*, asection
*, struct bfd_link_info
*);
1644 extern bfd_boolean _bfd_elf_copy_private_section_data
1645 (bfd
*, asection
*, bfd
*, asection
*);
1646 extern bfd_boolean _bfd_elf_write_object_contents
1648 extern bfd_boolean _bfd_elf_write_corefile_contents
1650 extern bfd_boolean _bfd_elf_set_section_contents
1651 (bfd
*, sec_ptr
, const void *, file_ptr
, bfd_size_type
);
1652 extern long _bfd_elf_get_symtab_upper_bound
1654 extern long _bfd_elf_canonicalize_symtab
1655 (bfd
*, asymbol
**);
1656 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1658 extern long _bfd_elf_canonicalize_dynamic_symtab
1659 (bfd
*, asymbol
**);
1660 extern long _bfd_elf_get_synthetic_symtab
1661 (bfd
*, long, asymbol
**, long, asymbol
**, asymbol
**);
1662 extern long _bfd_elf_get_reloc_upper_bound
1664 extern long _bfd_elf_canonicalize_reloc
1665 (bfd
*, sec_ptr
, arelent
**, asymbol
**);
1666 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1668 extern long _bfd_elf_canonicalize_dynamic_reloc
1669 (bfd
*, arelent
**, asymbol
**);
1670 extern asymbol
*_bfd_elf_make_empty_symbol
1672 extern void _bfd_elf_get_symbol_info
1673 (bfd
*, asymbol
*, symbol_info
*);
1674 extern bfd_boolean _bfd_elf_is_local_label_name
1675 (bfd
*, const char *);
1676 extern alent
*_bfd_elf_get_lineno
1678 extern bfd_boolean _bfd_elf_set_arch_mach
1679 (bfd
*, enum bfd_architecture
, unsigned long);
1680 extern bfd_boolean _bfd_elf_find_nearest_line
1681 (bfd
*, asection
*, asymbol
**, bfd_vma
, const char **, const char **,
1683 extern bfd_boolean _bfd_elf_find_line
1684 (bfd
*, asymbol
**, asymbol
*, const char **, unsigned int *);
1685 #define _bfd_generic_find_line _bfd_elf_find_line
1686 extern bfd_boolean _bfd_elf_find_inliner_info
1687 (bfd
*, const char **, const char **, unsigned int *);
1688 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1689 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1690 extern int _bfd_elf_sizeof_headers
1691 (bfd
*, struct bfd_link_info
*);
1692 extern bfd_boolean _bfd_elf_new_section_hook
1693 (bfd
*, asection
*);
1694 extern bfd_boolean _bfd_elf_init_reloc_shdr
1695 (bfd
*, Elf_Internal_Shdr
*, asection
*, bfd_boolean
);
1696 extern const struct bfd_elf_special_section
*_bfd_elf_get_special_section
1697 (const char *, const struct bfd_elf_special_section
*, unsigned int);
1698 extern const struct bfd_elf_special_section
*_bfd_elf_get_sec_type_attr
1699 (bfd
*, asection
*);
1701 /* If the target doesn't have reloc handling written yet: */
1702 extern void _bfd_elf_no_info_to_howto
1703 (bfd
*, arelent
*, Elf_Internal_Rela
*);
1705 extern bfd_boolean bfd_section_from_shdr
1706 (bfd
*, unsigned int shindex
);
1707 extern bfd_boolean bfd_section_from_phdr
1708 (bfd
*, Elf_Internal_Phdr
*, int);
1710 extern int _bfd_elf_symbol_from_bfd_symbol
1711 (bfd
*, asymbol
**);
1713 extern asection
*bfd_section_from_r_symndx
1714 (bfd
*, struct sym_sec_cache
*, asection
*, unsigned long);
1715 extern asection
*bfd_section_from_elf_index
1716 (bfd
*, unsigned int);
1717 extern struct bfd_strtab_hash
*_bfd_elf_stringtab_init
1720 extern struct elf_strtab_hash
* _bfd_elf_strtab_init
1722 extern void _bfd_elf_strtab_free
1723 (struct elf_strtab_hash
*);
1724 extern bfd_size_type _bfd_elf_strtab_add
1725 (struct elf_strtab_hash
*, const char *, bfd_boolean
);
1726 extern void _bfd_elf_strtab_addref
1727 (struct elf_strtab_hash
*, bfd_size_type
);
1728 extern void _bfd_elf_strtab_delref
1729 (struct elf_strtab_hash
*, bfd_size_type
);
1730 extern void _bfd_elf_strtab_clear_all_refs
1731 (struct elf_strtab_hash
*);
1732 extern bfd_size_type _bfd_elf_strtab_size
1733 (struct elf_strtab_hash
*);
1734 extern bfd_size_type _bfd_elf_strtab_offset
1735 (struct elf_strtab_hash
*, bfd_size_type
);
1736 extern bfd_boolean _bfd_elf_strtab_emit
1737 (bfd
*, struct elf_strtab_hash
*);
1738 extern void _bfd_elf_strtab_finalize
1739 (struct elf_strtab_hash
*);
1741 extern void _bfd_elf_begin_eh_frame_parsing
1742 (struct bfd_link_info
*info
);
1743 extern void _bfd_elf_parse_eh_frame
1744 (bfd
*, struct bfd_link_info
*, asection
*, struct elf_reloc_cookie
*);
1745 extern void _bfd_elf_end_eh_frame_parsing
1746 (struct bfd_link_info
*info
);
1748 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1749 (bfd
*, struct bfd_link_info
*, asection
*,
1750 bfd_boolean (*) (bfd_vma
, void *), struct elf_reloc_cookie
*);
1751 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1752 (bfd
*, struct bfd_link_info
*);
1753 extern bfd_vma _bfd_elf_eh_frame_section_offset
1754 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
);
1755 extern bfd_boolean _bfd_elf_write_section_eh_frame
1756 (bfd
*, struct bfd_link_info
*, asection
*, bfd_byte
*);
1757 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1758 (bfd
*, struct bfd_link_info
*);
1759 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1760 (struct bfd_link_info
*);
1762 extern bfd_boolean _bfd_elf_merge_symbol
1763 (bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
1764 asection
**, bfd_vma
*, unsigned int *,
1765 struct elf_link_hash_entry
**, bfd_boolean
*,
1766 bfd_boolean
*, bfd_boolean
*, bfd_boolean
*);
1768 extern bfd_boolean
_bfd_elf_hash_symbol (struct elf_link_hash_entry
*);
1770 extern bfd_boolean _bfd_elf_add_default_symbol
1771 (bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
1772 const char *, Elf_Internal_Sym
*, asection
**, bfd_vma
*,
1773 bfd_boolean
*, bfd_boolean
);
1775 extern bfd_boolean _bfd_elf_export_symbol
1776 (struct elf_link_hash_entry
*, void *);
1778 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1779 (struct elf_link_hash_entry
*, void *);
1781 extern bfd_boolean _bfd_elf_link_assign_sym_version
1782 (struct elf_link_hash_entry
*, void *);
1784 extern long _bfd_elf_link_lookup_local_dynindx
1785 (struct bfd_link_info
*, bfd
*, long);
1786 extern bfd_boolean _bfd_elf_compute_section_file_positions
1787 (bfd
*, struct bfd_link_info
*);
1788 extern void _bfd_elf_assign_file_positions_for_relocs
1790 extern file_ptr _bfd_elf_assign_file_position_for_section
1791 (Elf_Internal_Shdr
*, file_ptr
, bfd_boolean
);
1793 extern bfd_boolean _bfd_elf_validate_reloc
1796 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1797 (bfd
*, struct bfd_link_info
*);
1798 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1799 (bfd
*, struct bfd_link_info
*, asection
*);
1800 extern bfd_boolean _bfd_elf_create_dynamic_sections
1801 (bfd
*, struct bfd_link_info
*);
1802 extern bfd_boolean _bfd_elf_create_got_section
1803 (bfd
*, struct bfd_link_info
*);
1804 extern struct elf_link_hash_entry
*_bfd_elf_define_linkage_sym
1805 (bfd
*, struct bfd_link_info
*, asection
*, const char *);
1806 extern void _bfd_elf_init_1_index_section
1807 (bfd
*, struct bfd_link_info
*);
1808 extern void _bfd_elf_init_2_index_sections
1809 (bfd
*, struct bfd_link_info
*);
1811 extern bfd_boolean _bfd_elfcore_make_pseudosection
1812 (bfd
*, char *, size_t, ufile_ptr
);
1813 extern char *_bfd_elfcore_strndup
1814 (bfd
*, char *, size_t);
1816 extern Elf_Internal_Rela
*_bfd_elf_link_read_relocs
1817 (bfd
*, asection
*, void *, Elf_Internal_Rela
*, bfd_boolean
);
1819 extern bfd_boolean _bfd_elf_link_size_reloc_section
1820 (bfd
*, Elf_Internal_Shdr
*, asection
*);
1822 extern bfd_boolean _bfd_elf_link_output_relocs
1823 (bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*,
1824 struct elf_link_hash_entry
**);
1826 extern bfd_boolean _bfd_elf_fix_symbol_flags
1827 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
1829 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1830 (struct elf_link_hash_entry
*, void *);
1832 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1833 (struct elf_link_hash_entry
*, asection
*);
1835 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1836 (struct elf_link_hash_entry
*, void *);
1838 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1839 (struct elf_link_hash_entry
*, struct bfd_link_info
*, bfd_boolean
);
1841 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1842 (struct elf_link_hash_entry
*, struct bfd_link_info
*, bfd_boolean
);
1844 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1845 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, bfd_vma
);
1847 extern bfd_boolean _bfd_elf_setup_sections
1850 extern void _bfd_elf_set_osabi (bfd
* , struct bfd_link_info
*);
1852 extern const bfd_target
*bfd_elf32_object_p
1854 extern const bfd_target
*bfd_elf32_core_file_p
1856 extern char *bfd_elf32_core_file_failing_command
1858 extern int bfd_elf32_core_file_failing_signal
1860 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1863 extern bfd_boolean bfd_elf32_swap_symbol_in
1864 (bfd
*, const void *, const void *, Elf_Internal_Sym
*);
1865 extern void bfd_elf32_swap_symbol_out
1866 (bfd
*, const Elf_Internal_Sym
*, void *, void *);
1867 extern void bfd_elf32_swap_reloc_in
1868 (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
1869 extern void bfd_elf32_swap_reloc_out
1870 (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
1871 extern void bfd_elf32_swap_reloca_in
1872 (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
1873 extern void bfd_elf32_swap_reloca_out
1874 (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
1875 extern void bfd_elf32_swap_phdr_in
1876 (bfd
*, const Elf32_External_Phdr
*, Elf_Internal_Phdr
*);
1877 extern void bfd_elf32_swap_phdr_out
1878 (bfd
*, const Elf_Internal_Phdr
*, Elf32_External_Phdr
*);
1879 extern void bfd_elf32_swap_dyn_in
1880 (bfd
*, const void *, Elf_Internal_Dyn
*);
1881 extern void bfd_elf32_swap_dyn_out
1882 (bfd
*, const Elf_Internal_Dyn
*, void *);
1883 extern long bfd_elf32_slurp_symbol_table
1884 (bfd
*, asymbol
**, bfd_boolean
);
1885 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1887 extern int bfd_elf32_write_out_phdrs
1888 (bfd
*, const Elf_Internal_Phdr
*, unsigned int);
1889 extern bfd_boolean bfd_elf32_checksum_contents
1890 (bfd
* , void (*) (const void *, size_t, void *), void *);
1891 extern void bfd_elf32_write_relocs
1892 (bfd
*, asection
*, void *);
1893 extern bfd_boolean bfd_elf32_slurp_reloc_table
1894 (bfd
*, asection
*, asymbol
**, bfd_boolean
);
1896 extern const bfd_target
*bfd_elf64_object_p
1898 extern const bfd_target
*bfd_elf64_core_file_p
1900 extern char *bfd_elf64_core_file_failing_command
1902 extern int bfd_elf64_core_file_failing_signal
1904 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
1907 extern bfd_boolean bfd_elf64_swap_symbol_in
1908 (bfd
*, const void *, const void *, Elf_Internal_Sym
*);
1909 extern void bfd_elf64_swap_symbol_out
1910 (bfd
*, const Elf_Internal_Sym
*, void *, void *);
1911 extern void bfd_elf64_swap_reloc_in
1912 (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
1913 extern void bfd_elf64_swap_reloc_out
1914 (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
1915 extern void bfd_elf64_swap_reloca_in
1916 (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
1917 extern void bfd_elf64_swap_reloca_out
1918 (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
1919 extern void bfd_elf64_swap_phdr_in
1920 (bfd
*, const Elf64_External_Phdr
*, Elf_Internal_Phdr
*);
1921 extern void bfd_elf64_swap_phdr_out
1922 (bfd
*, const Elf_Internal_Phdr
*, Elf64_External_Phdr
*);
1923 extern void bfd_elf64_swap_dyn_in
1924 (bfd
*, const void *, Elf_Internal_Dyn
*);
1925 extern void bfd_elf64_swap_dyn_out
1926 (bfd
*, const Elf_Internal_Dyn
*, void *);
1927 extern long bfd_elf64_slurp_symbol_table
1928 (bfd
*, asymbol
**, bfd_boolean
);
1929 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
1931 extern int bfd_elf64_write_out_phdrs
1932 (bfd
*, const Elf_Internal_Phdr
*, unsigned int);
1933 extern bfd_boolean bfd_elf64_checksum_contents
1934 (bfd
* , void (*) (const void *, size_t, void *), void *);
1935 extern void bfd_elf64_write_relocs
1936 (bfd
*, asection
*, void *);
1937 extern bfd_boolean bfd_elf64_slurp_reloc_table
1938 (bfd
*, asection
*, asymbol
**, bfd_boolean
);
1940 extern bfd_boolean _bfd_elf_default_relocs_compatible
1941 (const bfd_target
*, const bfd_target
*);
1943 extern bfd_boolean _bfd_elf_relocs_compatible
1944 (const bfd_target
*, const bfd_target
*);
1946 extern struct elf_link_hash_entry
*_bfd_elf_archive_symbol_lookup
1947 (bfd
*, struct bfd_link_info
*, const char *);
1948 extern bfd_boolean bfd_elf_link_add_symbols
1949 (bfd
*, struct bfd_link_info
*);
1950 extern bfd_boolean _bfd_elf_add_dynamic_entry
1951 (struct bfd_link_info
*, bfd_vma
, bfd_vma
);
1953 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
1954 (struct bfd_link_info
*, struct elf_link_hash_entry
*);
1956 extern int bfd_elf_link_record_local_dynamic_symbol
1957 (struct bfd_link_info
*, bfd
*, long);
1959 extern void bfd_elf_link_mark_dynamic_symbol
1960 (struct bfd_link_info
*, struct elf_link_hash_entry
*,
1961 Elf_Internal_Sym
*);
1963 extern bfd_boolean _bfd_elf_close_and_cleanup
1966 extern bfd_boolean _bfd_elf_common_definition
1967 (Elf_Internal_Sym
*);
1969 extern unsigned int _bfd_elf_common_section_index
1972 extern asection
*_bfd_elf_common_section
1975 extern void _bfd_dwarf2_cleanup_debug_info
1978 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
1979 (bfd
*, arelent
*, struct bfd_symbol
*, void *,
1980 asection
*, bfd
*, char **);
1982 extern bfd_boolean bfd_elf_final_link
1983 (bfd
*, struct bfd_link_info
*);
1985 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
1986 (struct elf_link_hash_entry
*h
, void *inf
);
1988 extern bfd_boolean bfd_elf_gc_sections
1989 (bfd
*, struct bfd_link_info
*);
1991 extern bfd_boolean bfd_elf_gc_record_vtinherit
1992 (bfd
*, asection
*, struct elf_link_hash_entry
*, bfd_vma
);
1994 extern bfd_boolean bfd_elf_gc_record_vtentry
1995 (bfd
*, asection
*, struct elf_link_hash_entry
*, bfd_vma
);
1997 extern asection
*_bfd_elf_gc_mark_hook
1998 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
1999 struct elf_link_hash_entry
*, Elf_Internal_Sym
*);
2001 extern asection
*_bfd_elf_gc_mark_rsec
2002 (struct bfd_link_info
*, asection
*, elf_gc_mark_hook_fn
,
2003 struct elf_reloc_cookie
*);
2005 extern bfd_boolean _bfd_elf_gc_mark_reloc
2006 (struct bfd_link_info
*, asection
*, elf_gc_mark_hook_fn
,
2007 struct elf_reloc_cookie
*, bfd_boolean
);
2009 extern bfd_boolean _bfd_elf_gc_mark
2010 (struct bfd_link_info
*, asection
*, elf_gc_mark_hook_fn
);
2012 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2013 (bfd
*, struct bfd_link_info
*);
2015 extern bfd_boolean bfd_elf_gc_common_final_link
2016 (bfd
*, struct bfd_link_info
*);
2018 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2021 extern struct elf_segment_map
* _bfd_elf_make_dynamic_segment
2022 (bfd
*, asection
*);
2024 extern bfd_boolean _bfd_elf_map_sections_to_segments
2025 (bfd
*, struct bfd_link_info
*);
2027 extern bfd_boolean
_bfd_elf_is_function_type (unsigned int);
2029 /* Exported interface for writing elf corefile notes. */
2030 extern char *elfcore_write_note
2031 (bfd
*, char *, int *, const char *, int, const void *, int);
2032 extern char *elfcore_write_prpsinfo
2033 (bfd
*, char *, int *, const char *, const char *);
2034 extern char *elfcore_write_prstatus
2035 (bfd
*, char *, int *, long, int, const void *);
2036 extern char * elfcore_write_pstatus
2037 (bfd
*, char *, int *, long, int, const void *);
2038 extern char *elfcore_write_prfpreg
2039 (bfd
*, char *, int *, const void *, int);
2040 extern char *elfcore_write_prxfpreg
2041 (bfd
*, char *, int *, const void *, int);
2042 extern char *elfcore_write_ppc_vmx
2043 (bfd
*, char *, int *, const void *, int);
2044 extern char *elfcore_write_lwpstatus
2045 (bfd
*, char *, int *, long, int, const void *);
2047 extern bfd
*_bfd_elf32_bfd_from_remote_memory
2048 (bfd
*templ
, bfd_vma ehdr_vma
, bfd_vma
*loadbasep
,
2049 int (*target_read_memory
) (bfd_vma
, bfd_byte
*, int));
2050 extern bfd
*_bfd_elf64_bfd_from_remote_memory
2051 (bfd
*templ
, bfd_vma ehdr_vma
, bfd_vma
*loadbasep
,
2052 int (*target_read_memory
) (bfd_vma
, bfd_byte
*, int));
2054 extern bfd_vma
bfd_elf_obj_attr_size (bfd
*);
2055 extern void bfd_elf_set_obj_attr_contents (bfd
*, bfd_byte
*, bfd_vma
);
2056 extern int bfd_elf_get_obj_attr_int (bfd
*, int, int);
2057 extern void bfd_elf_add_obj_attr_int (bfd
*, int, int, unsigned int);
2058 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2059 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2060 extern void bfd_elf_add_obj_attr_string (bfd
*, int, int, const char *);
2061 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2062 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2063 extern void bfd_elf_add_obj_attr_compat (bfd
*, int, unsigned int,
2065 #define bfd_elf_add_proc_attr_compat(BFD, INTVAL, STRVAL) \
2066 bfd_elf_add_obj_attr_compat ((BFD), OBJ_ATTR_PROC, (INTVAL), (STRVAL))
2068 extern char *_bfd_elf_attr_strdup (bfd
*, const char *);
2069 extern void _bfd_elf_copy_obj_attributes (bfd
*, bfd
*);
2070 extern int _bfd_elf_obj_attrs_arg_type (bfd
*, int, int);
2071 extern void _bfd_elf_parse_attributes (bfd
*, Elf_Internal_Shdr
*);
2072 extern bfd_boolean
_bfd_elf_merge_object_attributes (bfd
*, bfd
*);
2074 /* Large common section. */
2075 extern asection _bfd_elf_large_com_section
;
2077 /* SH ELF specific routine. */
2079 extern bfd_boolean _sh_elf_set_mach_from_flags
2082 /* This is the condition under which finish_dynamic_symbol will be called.
2083 If our finish_dynamic_symbol isn't called, we'll need to do something
2084 about initializing any .plt and .got entries in relocate_section. */
2085 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2087 && ((SHARED) || !(H)->forced_local) \
2088 && ((H)->dynindx != -1 || (H)->forced_local))
2090 /* This macro is to avoid lots of duplicated code in the body
2091 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2092 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2093 r_symndx, symtab_hdr, sym_hashes, \
2094 h, sec, relocation, \
2095 unresolved_reloc, warned) \
2098 /* It seems this can happen with erroneous or unsupported \
2099 input (mixing a.out and elf in an archive, for example.) */ \
2100 if (sym_hashes == NULL) \
2103 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2105 while (h->root.type == bfd_link_hash_indirect \
2106 || h->root.type == bfd_link_hash_warning) \
2107 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2110 unresolved_reloc = FALSE; \
2112 if (h->root.type == bfd_link_hash_defined \
2113 || h->root.type == bfd_link_hash_defweak) \
2115 sec = h->root.u.def.section; \
2117 || sec->output_section == NULL) \
2118 /* Set a flag that will be cleared later if we find a \
2119 relocation value for this symbol. output_section \
2120 is typically NULL for symbols satisfied by a shared \
2122 unresolved_reloc = TRUE; \
2124 relocation = (h->root.u.def.value \
2125 + sec->output_section->vma \
2126 + sec->output_offset); \
2128 else if (h->root.type == bfd_link_hash_undefweak) \
2130 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2131 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2133 else if (!info->relocatable) \
2136 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2137 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2138 if (!info->callbacks->undefined_symbol (info, \
2139 h->root.root.string, \
2142 rel->r_offset, err)) \
2149 /* Will a symbol be bound to the the definition within the shared
2151 #define SYMBOLIC_BIND(INFO, H) \
2152 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
2154 #endif /* _LIBELF_H_ */