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, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #include "elf/common.h"
28 #include "elf/external.h"
29 #include "elf/internal.h"
32 /* The number of entries in a section is its size divided by the size
33 of a single entry. This is normally only applicable to reloc and
34 symbol table sections.
35 PR 9934: It is possible to have relocations that do not refer to
36 symbols, thus it is also possible to have a relocation section in
37 an object file, but no symbol table. */
38 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
40 /* If size isn't specified as 64 or 32, NAME macro should fail. */
43 #define NAME(x, y) x ## 64 ## _ ## y
46 #define NAME(x, y) x ## 32 ## _ ## y
51 #define NAME(x, y) x ## NOSIZE ## _ ## y
54 #define ElfNAME(X) NAME(Elf,X)
55 #define elfNAME(X) NAME(elf,X)
57 /* Information held for an ELF symbol. The first field is the
58 corresponding asymbol. Every symbol is an ELF file is actually a
59 pointer to this structure, although it is often handled as a
60 pointer to an asymbol. */
66 /* ELF symbol information. */
67 Elf_Internal_Sym internal_elf_sym;
68 /* Backend specific information. */
71 unsigned int hppa_arg_reloc;
77 /* Version information. This is from an Elf_Internal_Versym
78 structure in a SHT_GNU_versym section. It is zero if there is no
79 version information. */
80 unsigned short version;
84 struct elf_strtab_hash;
90 bfd_signed_vma refcount;
92 struct got_entry *glist;
93 struct plt_entry *plist;
96 struct elf_link_virtual_table_entry
98 /* Virtual table entry use information. This array is nominally of size
99 size/sizeof(target_void_pointer), though we have to be able to assume
100 and track a size while the symbol is still undefined. It is indexed
101 via offset/sizeof(target_void_pointer). */
105 /* Virtual table derivation info. */
106 struct elf_link_hash_entry *parent;
109 /* ELF linker hash table entries. */
111 struct elf_link_hash_entry
113 struct bfd_link_hash_entry root;
115 /* Symbol index in output file. This is initialized to -1. It is
116 set to -2 if the symbol is used by a reloc. */
119 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
120 -1 if this is not a dynamic symbol. */
121 /* ??? Note that this is consistently used as a synonym for tests
122 against whether we can perform various simplifying transformations
123 to the code. (E.g. changing a pc-relative jump to a PLT entry
124 into a pc-relative jump to the target function.) That test, which
125 is often relatively complex, and someplaces wrong or incomplete,
126 should really be replaced by a predicate in elflink.c.
128 End result: this field -1 does not indicate that the symbol is
129 not in the dynamic symbol table, but rather that the symbol is
130 not visible outside this DSO. */
133 /* If this symbol requires an entry in the global offset table, the
134 processor specific backend uses this field to track usage and
135 final offset. Two schemes are supported: The first assumes that
136 a symbol may only have one GOT entry, and uses REFCOUNT until
137 size_dynamic_sections, at which point the contents of the .got is
138 fixed. Afterward, if OFFSET is -1, then the symbol does not
139 require a global offset table entry. The second scheme allows
140 multiple GOT entries per symbol, managed via a linked list
141 pointed to by GLIST. */
142 union gotplt_union got;
144 /* Same, but tracks a procedure linkage table entry. */
145 union gotplt_union plt;
150 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
151 unsigned int type : 8;
153 /* Symbol st_other value, symbol visibility. */
154 unsigned int other : 8;
156 /* Symbol is referenced by a non-shared object (other than the object
157 in which it is defined). */
158 unsigned int ref_regular : 1;
159 /* Symbol is defined by a non-shared object. */
160 unsigned int def_regular : 1;
161 /* Symbol is referenced by a shared object. */
162 unsigned int ref_dynamic : 1;
163 /* Symbol is defined by a shared object. */
164 unsigned int def_dynamic : 1;
165 /* Symbol has a non-weak reference from a non-shared object (other than
166 the object in which it is defined). */
167 unsigned int ref_regular_nonweak : 1;
168 /* Dynamic symbol has been adjustd. */
169 unsigned int dynamic_adjusted : 1;
170 /* Symbol needs a copy reloc. */
171 unsigned int needs_copy : 1;
172 /* Symbol needs a procedure linkage table entry. */
173 unsigned int needs_plt : 1;
174 /* Symbol appears in a non-ELF input file. */
175 unsigned int non_elf : 1;
176 /* Symbol should be marked as hidden in the version information. */
177 unsigned int hidden : 1;
178 /* Symbol was forced to local scope due to a version script file. */
179 unsigned int forced_local : 1;
180 /* Symbol was forced to be dynamic due to a version script file. */
181 unsigned int dynamic : 1;
182 /* Symbol was marked during garbage collection. */
183 unsigned int mark : 1;
184 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
185 not currently set by all the backends. */
186 unsigned int non_got_ref : 1;
187 /* Symbol has a definition in a shared object.
188 FIXME: There is no real need for this field if def_dynamic is never
189 cleared and all places that test def_dynamic also test def_regular. */
190 unsigned int dynamic_def : 1;
191 /* Symbol is weak in all shared objects. */
192 unsigned int dynamic_weak : 1;
193 /* Symbol is referenced with a relocation where C/C++ pointer equality
195 unsigned int pointer_equality_needed : 1;
196 /* Symbol is a unique global symbol. */
197 unsigned int unique_global : 1;
199 /* String table index in .dynstr if this is a dynamic symbol. */
200 unsigned long dynstr_index;
204 /* If this is a weak defined symbol from a dynamic object, this
205 field points to a defined symbol with the same value, if there is
206 one. Otherwise it is NULL. */
207 struct elf_link_hash_entry *weakdef;
209 /* Hash value of the name computed using the ELF hash function.
210 Used part way through size_dynamic_sections, after we've finished
212 unsigned long elf_hash_value;
215 /* Version information. */
218 /* This field is used for a symbol which is not defined in a
219 regular object. It points to the version information read in
220 from the dynamic object. */
221 Elf_Internal_Verdef *verdef;
222 /* This field is used for a symbol which is defined in a regular
223 object. It is set up in size_dynamic_sections. It points to
224 the version information we should write out for this symbol. */
225 struct bfd_elf_version_tree *vertree;
228 struct elf_link_virtual_table_entry *vtable;
231 /* Will references to this symbol always reference the symbol
232 in this object? STV_PROTECTED is excluded from the visibility test
233 here so that function pointer comparisons work properly. Since
234 function symbols not defined in an app are set to their .plt entry,
235 it's necessary for shared libs to also reference the .plt even
236 though the symbol is really local to the shared lib. */
237 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
238 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
240 /* Will _calls_ to this symbol always call the version in this object? */
241 #define SYMBOL_CALLS_LOCAL(INFO, H) \
242 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
244 /* Common symbols that are turned into definitions don't have the
245 DEF_REGULAR flag set, so they might appear to be undefined. */
246 #define ELF_COMMON_DEF_P(H) \
248 && !(H)->def_dynamic \
249 && (H)->root.type == bfd_link_hash_defined)
251 /* Records local symbols to be emitted in the dynamic symbol table. */
253 struct elf_link_local_dynamic_entry
255 struct elf_link_local_dynamic_entry *next;
257 /* The input bfd this symbol came from. */
260 /* The index of the local symbol being copied. */
263 /* The index in the outgoing dynamic symbol table. */
266 /* A copy of the input symbol. */
267 Elf_Internal_Sym isym;
270 struct elf_link_loaded_list
272 struct elf_link_loaded_list *next;
276 /* Structures used by the eh_frame optimization code. */
281 /* If REMOVED == 1, this is the CIE that the FDE originally used.
282 The CIE belongs to the same .eh_frame input section as the FDE.
284 If REMOVED == 0, this is the CIE that we have chosen to use for
285 the output FDE. The CIE's REMOVED field is also 0, but the CIE
286 might belong to a different .eh_frame input section from the FDE. */
287 struct eh_cie_fde *cie_inf;
288 struct eh_cie_fde *next_for_section;
291 /* CIEs have three states:
293 - REMOVED && !MERGED: Slated for removal because we haven't yet
294 proven that an FDE needs it. FULL_CIE, if nonnull, points to
295 more detailed information about the CIE.
297 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
298 which may not belong to the same input section.
300 - !REMOVED: We have decided to keep this CIE. SEC is the
301 .eh_frame input section that contains the CIE. */
303 struct cie *full_cie;
304 struct eh_cie_fde *merged_with;
308 /* The offset of the personality data from the start of the CIE,
309 or 0 if the CIE doesn't have any. */
310 unsigned int personality_offset : 8;
312 /* True if we have marked relocations associated with this CIE. */
313 unsigned int gc_mark : 1;
315 /* True if we have decided to turn an absolute LSDA encoding into
316 a PC-relative one. */
317 unsigned int make_lsda_relative : 1;
319 /* True if we have decided to turn an absolute personality
320 encoding into a PC-relative one. */
321 unsigned int make_per_encoding_relative : 1;
323 /* True if the CIE contains personality data and if that
324 data uses a PC-relative encoding. Always true when
325 make_per_encoding_relative is. */
326 unsigned int per_encoding_relative : 1;
328 /* True if we need to add an 'R' (FDE encoding) entry to the
329 CIE's augmentation data. */
330 unsigned int add_fde_encoding : 1;
332 /* True if we have merged this CIE with another. */
333 unsigned int merged : 1;
336 unsigned int pad1 : 18;
339 unsigned int reloc_index;
342 unsigned int new_offset;
343 unsigned int fde_encoding : 8;
344 unsigned int lsda_encoding : 8;
345 unsigned int lsda_offset : 8;
347 /* True if this entry represents a CIE, false if it represents an FDE. */
348 unsigned int cie : 1;
350 /* True if this entry is currently marked for removal. */
351 unsigned int removed : 1;
353 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
354 augmentation data, and an associated byte to each of the CIE's FDEs. */
355 unsigned int add_augmentation_size : 1;
357 /* True if we have decided to convert absolute FDE relocations into
358 relative ones. This applies to the first relocation in the FDE,
359 which is against the code that the FDE describes. */
360 unsigned int make_relative : 1;
363 unsigned int pad1 : 4;
365 unsigned int *set_loc;
368 struct eh_frame_sec_info
372 struct eh_cie_fde entry[1];
375 struct eh_frame_array_ent
383 struct eh_frame_hdr_info
387 unsigned int fde_count, array_count;
388 struct eh_frame_array_ent *array;
389 /* TRUE if we should try to merge CIEs between input sections. */
390 bfd_boolean merge_cies;
391 /* TRUE if all .eh_frames have been parsd. */
392 bfd_boolean parsed_eh_frames;
393 /* TRUE if .eh_frame_hdr should contain the sorted search table.
394 We build it if we successfully read all .eh_frame input sections
395 and recognize them. */
399 /* Enum used to identify target specific extensions to the elf_obj_tdata
400 and elf_link_hash_table structures. Note the enums deliberately start
401 from 1 so that we can detect an uninitialized field. The generic value
402 is last so that additions to this enum do not need to modify more than
435 /* ELF linker hash table. */
437 struct elf_link_hash_table
439 struct bfd_link_hash_table root;
441 /* An identifier used to distinguish different target
442 specific extensions to this structure. */
443 enum elf_target_id hash_table_id;
445 /* Whether we have created the special dynamic sections required
446 when linking against or generating a shared object. */
447 bfd_boolean dynamic_sections_created;
449 /* True if this target has relocatable executables, so needs dynamic
451 bfd_boolean is_relocatable_executable;
453 /* The BFD used to hold special sections created by the linker.
454 This will be the first BFD found which requires these sections to
458 /* The value to use when initialising got.refcount/offset and
459 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
460 the values are refcounts. Set to init_got_offset/init_plt_offset
461 in size_dynamic_sections when the values may be offsets. */
462 union gotplt_union init_got_refcount;
463 union gotplt_union init_plt_refcount;
465 /* The value to use for got.refcount/offset and plt.refcount/offset
466 when the values may be offsets. Normally (bfd_vma) -1. */
467 union gotplt_union init_got_offset;
468 union gotplt_union init_plt_offset;
470 /* The number of symbols found in the link which must be put into
471 the .dynsym section. */
472 bfd_size_type dynsymcount;
474 /* The string table of dynamic symbols, which becomes the .dynstr
476 struct elf_strtab_hash *dynstr;
478 /* The number of buckets in the hash table in the .hash section.
479 This is based on the number of dynamic symbols. */
480 bfd_size_type bucketcount;
482 /* A linked list of DT_NEEDED names found in dynamic objects
483 included in the link. */
484 struct bfd_link_needed_list *needed;
486 /* Sections in the output bfd that provides a section symbol
487 to be used by relocations emitted against local symbols.
488 Most targets will not use data_index_section. */
489 asection *text_index_section;
490 asection *data_index_section;
492 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
493 struct elf_link_hash_entry *hgot;
495 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
496 struct elf_link_hash_entry *hplt;
498 /* A pointer to information used to merge SEC_MERGE sections. */
501 /* Used to link stabs in sections. */
502 struct stab_info stab_info;
504 /* Used by eh_frame code when editing .eh_frame. */
505 struct eh_frame_hdr_info eh_info;
507 /* A linked list of local symbols to be added to .dynsym. */
508 struct elf_link_local_dynamic_entry *dynlocal;
510 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
511 objects included in the link. */
512 struct bfd_link_needed_list *runpath;
514 /* Cached first output tls section and size of PT_TLS segment. */
516 bfd_size_type tls_size;
518 /* A linked list of BFD's loaded in the link. */
519 struct elf_link_loaded_list *loaded;
521 /* Short-cuts to get to dynamic linker sections. */
533 /* Look up an entry in an ELF linker hash table. */
535 #define elf_link_hash_lookup(table, string, create, copy, follow) \
536 ((struct elf_link_hash_entry *) \
537 bfd_link_hash_lookup (&(table)->root, (string), (create), \
540 /* Traverse an ELF linker hash table. */
542 #define elf_link_hash_traverse(table, func, info) \
543 (bfd_link_hash_traverse \
545 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
548 /* Get the ELF linker hash table from a link_info structure. */
550 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
552 #define elf_hash_table_id(table) ((table) -> hash_table_id)
554 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
555 #define is_elf_hash_table(htab) \
556 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
558 /* Used by bfd_sym_from_r_symndx to cache a small number of local
560 #define LOCAL_SYM_CACHE_SIZE 32
564 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
565 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
568 /* Constant information held for an ELF backend. */
570 struct elf_size_info {
571 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
572 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
574 /* The size of entries in the .hash section. */
575 unsigned char sizeof_hash_entry;
577 /* The number of internal relocations to allocate per external
579 unsigned char int_rels_per_ext_rel;
580 /* We use some fixed size arrays. This should be large enough to
581 handle all back-ends. */
582 #define MAX_INT_RELS_PER_EXT_REL 3
584 unsigned char arch_size, log_file_align;
585 unsigned char elfclass, ev_current;
586 int (*write_out_phdrs)
587 (bfd *, const Elf_Internal_Phdr *, unsigned int);
589 (*write_shdrs_and_ehdr) (bfd *);
590 bfd_boolean (*checksum_contents)
591 (bfd * , void (*) (const void *, size_t, void *), void *);
593 (bfd *, asection *, void *);
594 bfd_boolean (*swap_symbol_in)
595 (bfd *, const void *, const void *, Elf_Internal_Sym *);
596 void (*swap_symbol_out)
597 (bfd *, const Elf_Internal_Sym *, void *, void *);
598 bfd_boolean (*slurp_reloc_table)
599 (bfd *, asection *, asymbol **, bfd_boolean);
600 long (*slurp_symbol_table)
601 (bfd *, asymbol **, bfd_boolean);
603 (bfd *, const void *, Elf_Internal_Dyn *);
605 (bfd *, const Elf_Internal_Dyn *, void *);
607 /* This function is called to swap in a REL relocation. If an
608 external relocation corresponds to more than one internal
609 relocation, then all relocations are swapped in at once. */
610 void (*swap_reloc_in)
611 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
613 /* This function is called to swap out a REL relocation. */
614 void (*swap_reloc_out)
615 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
617 /* This function is called to swap in a RELA relocation. If an
618 external relocation corresponds to more than one internal
619 relocation, then all relocations are swapped in at once. */
620 void (*swap_reloca_in)
621 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
623 /* This function is called to swap out a RELA relocation. */
624 void (*swap_reloca_out)
625 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
628 #define elf_symbol_from(ABFD,S) \
629 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
630 && (S)->the_bfd->tdata.elf_obj_data != 0) \
631 ? (elf_symbol_type *) (S) \
634 enum elf_reloc_type_class {
636 reloc_class_relative,
641 struct elf_reloc_cookie
643 Elf_Internal_Rela *rels, *rel, *relend;
644 Elf_Internal_Sym *locsyms;
648 struct elf_link_hash_entry **sym_hashes;
650 bfd_boolean bad_symtab;
653 /* The level of IRIX compatibility we're striving for. */
661 /* Mapping of ELF section names and types. */
662 struct bfd_elf_special_section
666 /* 0 means name must match PREFIX exactly.
667 -1 means name must start with PREFIX followed by an arbitrary string.
668 -2 means name must match PREFIX exactly or consist of PREFIX followed
669 by a dot then anything.
670 > 0 means name must start with the first PREFIX_LENGTH chars of
671 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
677 enum action_discarded
683 typedef asection * (*elf_gc_mark_hook_fn)
684 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
685 struct elf_link_hash_entry *, Elf_Internal_Sym *);
687 struct elf_backend_data
689 /* The architecture for this backend. */
690 enum bfd_architecture arch;
692 /* The ELF machine code (EM_xxxx) for this backend. */
693 int elf_machine_code;
698 /* The maximum page size for this backend. */
701 /* The minimum page size for this backend. An input object will not be
702 considered page aligned unless its sections are correctly aligned for
703 pages at least this large. May be smaller than maxpagesize. */
706 /* The common page size for this backend. */
707 bfd_vma commonpagesize;
709 /* The BFD flags applied to sections created for dynamic linking. */
710 flagword dynamic_sec_flags;
712 /* A function to translate an ELF RELA relocation to a BFD arelent
714 void (*elf_info_to_howto)
715 (bfd *, arelent *, Elf_Internal_Rela *);
717 /* A function to translate an ELF REL relocation to a BFD arelent
719 void (*elf_info_to_howto_rel)
720 (bfd *, arelent *, Elf_Internal_Rela *);
722 /* A function to determine whether a symbol is global when
723 partitioning the symbol table into local and global symbols.
724 This should be NULL for most targets, in which case the correct
725 thing will be done. MIPS ELF, at least on the Irix 5, has
726 special requirements. */
727 bfd_boolean (*elf_backend_sym_is_global)
730 /* The remaining functions are hooks which are called only if they
733 /* A function to permit a backend specific check on whether a
734 particular BFD format is relevant for an object file, and to
735 permit the backend to set any global information it wishes. When
736 this is called elf_elfheader is set, but anything else should be
737 used with caution. If this returns FALSE, the check_format
738 routine will return a bfd_error_wrong_format error. */
739 bfd_boolean (*elf_backend_object_p)
742 /* A function to do additional symbol processing when reading the
743 ELF symbol table. This is where any processor-specific special
744 section indices are handled. */
745 void (*elf_backend_symbol_processing)
748 /* A function to do additional symbol processing after reading the
749 entire ELF symbol table. */
750 bfd_boolean (*elf_backend_symbol_table_processing)
751 (bfd *, elf_symbol_type *, unsigned int);
753 /* A function to set the type of the info field. Processor-specific
754 types should be handled here. */
755 int (*elf_backend_get_symbol_type)
756 (Elf_Internal_Sym *, int);
758 /* A function to return the linker hash table entry of a symbol that
759 might be satisfied by an archive symbol. */
760 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
761 (bfd *, struct bfd_link_info *, const char *);
763 /* Return true if local section symbols should have a non-null st_name.
764 NULL implies false. */
765 bfd_boolean (*elf_backend_name_local_section_symbols)
768 /* A function to do additional processing on the ELF section header
769 just before writing it out. This is used to set the flags and
770 type fields for some sections, or to actually write out data for
772 bfd_boolean (*elf_backend_section_processing)
773 (bfd *, Elf_Internal_Shdr *);
775 /* A function to handle unusual section types when creating BFD
776 sections from ELF sections. */
777 bfd_boolean (*elf_backend_section_from_shdr)
778 (bfd *, Elf_Internal_Shdr *, const char *, int);
780 /* A function to convert machine dependent ELF section header flags to
781 BFD internal section header flags. */
782 bfd_boolean (*elf_backend_section_flags)
783 (flagword *, const Elf_Internal_Shdr *);
785 /* A function that returns a struct containing ELF section flags and
786 type for the given BFD section. */
787 const struct bfd_elf_special_section * (*get_sec_type_attr)
790 /* A function to handle unusual program segment types when creating BFD
791 sections from ELF program segments. */
792 bfd_boolean (*elf_backend_section_from_phdr)
793 (bfd *, Elf_Internal_Phdr *, int, const char *);
795 /* A function to set up the ELF section header for a BFD section in
796 preparation for writing it out. This is where the flags and type
797 fields are set for unusual sections. */
798 bfd_boolean (*elf_backend_fake_sections)
799 (bfd *, Elf_Internal_Shdr *, asection *);
801 /* A function to get the ELF section index for a BFD section. If
802 this returns TRUE, the section was found. If it is a normal ELF
803 section, *RETVAL should be left unchanged. If it is not a normal
804 ELF section *RETVAL should be set to the SHN_xxxx index. */
805 bfd_boolean (*elf_backend_section_from_bfd_section)
806 (bfd *, asection *, int *retval);
808 /* If this field is not NULL, it is called by the add_symbols phase
809 of a link just before adding a symbol to the global linker hash
810 table. It may modify any of the fields as it wishes. If *NAME
811 is set to NULL, the symbol will be skipped rather than being
812 added to the hash table. This function is responsible for
813 handling all processor dependent symbol bindings and section
814 indices, and must set at least *FLAGS and *SEC for each processor
815 dependent case; failure to do so will cause a link error. */
816 bfd_boolean (*elf_add_symbol_hook)
817 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
818 const char **name, flagword *flags, asection **sec, bfd_vma *value);
820 /* If this field is not NULL, it is called by the elf_link_output_sym
821 phase of a link for each symbol which will appear in the object file.
822 On error, this function returns 0. 1 is returned when the symbol
823 should be output, 2 is returned when the symbol should be discarded. */
824 int (*elf_backend_link_output_symbol_hook)
825 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
826 asection *, struct elf_link_hash_entry *);
828 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
829 linker the first time it encounters a dynamic object in the link.
830 This function must create any sections required for dynamic
831 linking. The ABFD argument is a dynamic object. The .interp,
832 .dynamic, .dynsym, .dynstr, and .hash functions have already been
833 created, and this function may modify the section flags if
834 desired. This function will normally create the .got and .plt
835 sections, but different backends have different requirements. */
836 bfd_boolean (*elf_backend_create_dynamic_sections)
837 (bfd *abfd, struct bfd_link_info *info);
839 /* When creating a shared library, determine whether to omit the
840 dynamic symbol for the section. */
841 bfd_boolean (*elf_backend_omit_section_dynsym)
842 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
844 /* Return TRUE if relocations of targets are compatible to the extent
845 that CHECK_RELOCS will properly process them. PR 4424. */
846 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
848 /* The CHECK_RELOCS function is called by the add_symbols phase of
849 the ELF backend linker. It is called once for each section with
850 relocs of an object file, just after the symbols for the object
851 file have been added to the global linker hash table. The
852 function must look through the relocs and do any special handling
853 required. This generally means allocating space in the global
854 offset table, and perhaps allocating space for a reloc. The
855 relocs are always passed as Rela structures; if the section
856 actually uses Rel structures, the r_addend field will always be
858 bfd_boolean (*check_relocs)
859 (bfd *abfd, struct bfd_link_info *info, asection *o,
860 const Elf_Internal_Rela *relocs);
862 /* The CHECK_DIRECTIVES function is called once per input file by
863 the add_symbols phase of the ELF backend linker. The function
864 must inspect the bfd and create any additional symbols according
865 to any custom directives in the bfd. */
866 bfd_boolean (*check_directives)
867 (bfd *abfd, struct bfd_link_info *info);
869 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
870 input file that was not needed by the add_symbols phase of the
871 ELF backend linker. The function must undo any target specific
872 changes in the symbol hash table. */
873 bfd_boolean (*as_needed_cleanup)
874 (bfd *abfd, struct bfd_link_info *info);
876 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
877 linker for every symbol which is defined by a dynamic object and
878 referenced by a regular object. This is called after all the
879 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
880 function has been called. The hash table entry should be
881 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
882 defined in a section from a dynamic object. Dynamic object
883 sections are not included in the final link, and this function is
884 responsible for changing the value to something which the rest of
885 the link can deal with. This will normally involve adding an
886 entry to the .plt or .got or some such section, and setting the
887 symbol to point to that. */
888 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
889 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
891 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
892 after all the linker input files have been seen but before the
893 section sizes have been set. This is called after
894 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
895 bfd_boolean (*elf_backend_always_size_sections)
896 (bfd *output_bfd, struct bfd_link_info *info);
898 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
899 linker after all the linker input files have been seen but before
900 the sections sizes have been set. This is called after
901 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
902 It is only called when linking against a dynamic object. It must
903 set the sizes of the dynamic sections, and may fill in their
904 contents as well. The generic ELF linker can handle the .dynsym,
905 .dynstr and .hash sections. This function must handle the
906 .interp section and any sections created by the
907 CREATE_DYNAMIC_SECTIONS entry point. */
908 bfd_boolean (*elf_backend_size_dynamic_sections)
909 (bfd *output_bfd, struct bfd_link_info *info);
911 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
912 we keep to use as a base for relocs and symbols. */
913 void (*elf_backend_init_index_section)
914 (bfd *output_bfd, struct bfd_link_info *info);
916 /* The RELOCATE_SECTION function is called by the ELF backend linker
917 to handle the relocations for a section.
919 The relocs are always passed as Rela structures; if the section
920 actually uses Rel structures, the r_addend field will always be
923 This function is responsible for adjust the section contents as
924 necessary, and (if using Rela relocs and generating a
925 relocatable output file) adjusting the reloc addend as
928 This function does not have to worry about setting the reloc
929 address or the reloc symbol index.
931 LOCAL_SYMS is a pointer to the swapped in local symbols.
933 LOCAL_SECTIONS is an array giving the section in the input file
934 corresponding to the st_shndx field of each local symbol.
936 The global hash table entry for the global symbols can be found
937 via elf_sym_hashes (input_bfd).
939 When generating relocatable output, this function must handle
940 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
941 going to be the section symbol corresponding to the output
942 section, which means that the addend must be adjusted
945 Returns FALSE on error, TRUE on success, 2 if successful and
946 relocations should be written for this section. */
947 int (*elf_backend_relocate_section)
948 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
949 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
950 Elf_Internal_Sym *local_syms, asection **local_sections);
952 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
953 linker just before it writes a symbol out to the .dynsym section.
954 The processor backend may make any required adjustment to the
955 symbol. It may also take the opportunity to set contents of the
956 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
957 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
958 on those symbols which are defined by a dynamic object. */
959 bfd_boolean (*elf_backend_finish_dynamic_symbol)
960 (bfd *output_bfd, struct bfd_link_info *info,
961 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
963 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
964 linker just before it writes all the dynamic sections out to the
965 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
966 all dynamic symbols. */
967 bfd_boolean (*elf_backend_finish_dynamic_sections)
968 (bfd *output_bfd, struct bfd_link_info *info);
970 /* A function to do any beginning processing needed for the ELF file
971 before building the ELF headers and computing file positions. */
972 void (*elf_backend_begin_write_processing)
973 (bfd *, struct bfd_link_info *);
975 /* A function to do any final processing needed for the ELF file
976 before writing it out. The LINKER argument is TRUE if this BFD
977 was created by the ELF backend linker. */
978 void (*elf_backend_final_write_processing)
979 (bfd *, bfd_boolean linker);
981 /* This function is called by get_program_header_size. It should
982 return the number of additional program segments which this BFD
983 will need. It should return -1 on error. */
984 int (*elf_backend_additional_program_headers)
985 (bfd *, struct bfd_link_info *);
987 /* This function is called to modify an existing segment map in a
988 backend specific fashion. */
989 bfd_boolean (*elf_backend_modify_segment_map)
990 (bfd *, struct bfd_link_info *);
992 /* This function is called to modify program headers just before
994 bfd_boolean (*elf_backend_modify_program_headers)
995 (bfd *, struct bfd_link_info *);
997 /* This function is called before section garbage collection to
998 mark entry symbol sections. */
1000 (struct bfd_link_info *);
1002 /* This function is called during section garbage collection to
1003 mark sections that define global symbols. */
1004 bfd_boolean (*gc_mark_dynamic_ref)
1005 (struct elf_link_hash_entry *, void *);
1007 /* This function is called during section gc to discover the section a
1008 particular relocation refers to. */
1009 elf_gc_mark_hook_fn gc_mark_hook;
1011 /* This function, if defined, is called after the first gc marking pass
1012 to allow the backend to mark additional sections. */
1013 bfd_boolean (*gc_mark_extra_sections)
1014 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1016 /* This function, if defined, is called during the sweep phase of gc
1017 in order that a backend might update any data structures it might
1019 bfd_boolean (*gc_sweep_hook)
1020 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1022 /* This function, if defined, is called after the ELF headers have
1023 been created. This allows for things like the OS and ABI versions
1025 void (*elf_backend_post_process_headers)
1026 (bfd *, struct bfd_link_info *);
1028 /* This function, if defined, prints a symbol to file and returns the
1029 name of the symbol to be printed. It should return NULL to fall
1030 back to default symbol printing. */
1031 const char *(*elf_backend_print_symbol_all)
1032 (bfd *, void *, asymbol *);
1034 /* This function, if defined, is called after all local symbols and
1035 global symbols converted to locals are emitted into the symtab
1036 section. It allows the backend to emit special local symbols
1037 not handled in the hash table. */
1038 bfd_boolean (*elf_backend_output_arch_local_syms)
1039 (bfd *, struct bfd_link_info *, void *,
1040 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1041 struct elf_link_hash_entry *));
1043 /* This function, if defined, is called after all symbols are emitted
1044 into the symtab section. It allows the backend to emit special
1045 global symbols not handled in the hash table. */
1046 bfd_boolean (*elf_backend_output_arch_syms)
1047 (bfd *, struct bfd_link_info *, void *,
1048 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1049 struct elf_link_hash_entry *));
1051 /* Copy any information related to dynamic linking from a pre-existing
1052 symbol to a newly created symbol. Also called to copy flags and
1053 other back-end info to a weakdef, in which case the symbol is not
1054 newly created and plt/got refcounts and dynamic indices should not
1056 void (*elf_backend_copy_indirect_symbol)
1057 (struct bfd_link_info *, struct elf_link_hash_entry *,
1058 struct elf_link_hash_entry *);
1060 /* Modify any information related to dynamic linking such that the
1061 symbol is not exported. */
1062 void (*elf_backend_hide_symbol)
1063 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1065 /* A function to do additional symbol fixup, called by
1066 _bfd_elf_fix_symbol_flags. */
1067 bfd_boolean (*elf_backend_fixup_symbol)
1068 (struct bfd_link_info *, struct elf_link_hash_entry *);
1070 /* Merge the backend specific symbol attribute. */
1071 void (*elf_backend_merge_symbol_attribute)
1072 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1075 /* This function, if defined, will return a string containing the
1076 name of a target-specific dynamic tag. */
1077 char *(*elf_backend_get_target_dtag)
1080 /* Decide whether an undefined symbol is special and can be ignored.
1081 This is the case for OPTIONAL symbols on IRIX. */
1082 bfd_boolean (*elf_backend_ignore_undef_symbol)
1083 (struct elf_link_hash_entry *);
1085 /* Emit relocations. Overrides default routine for emitting relocs,
1086 except during a relocatable link, or if all relocs are being emitted. */
1087 bfd_boolean (*elf_backend_emit_relocs)
1088 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1089 struct elf_link_hash_entry **);
1091 /* Count relocations. Not called for relocatable links
1092 or if all relocs are being preserved in the output. */
1093 unsigned int (*elf_backend_count_relocs)
1094 (struct bfd_link_info *, asection *);
1096 /* This function, if defined, is called when an NT_PRSTATUS note is found
1098 bfd_boolean (*elf_backend_grok_prstatus)
1099 (bfd *, Elf_Internal_Note *);
1101 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1102 note is found in a core file. */
1103 bfd_boolean (*elf_backend_grok_psinfo)
1104 (bfd *, Elf_Internal_Note *);
1106 /* This function, if defined, is called to write a note to a corefile. */
1107 char *(*elf_backend_write_core_note)
1108 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1110 /* This function returns class of a reloc type. */
1111 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1112 (const Elf_Internal_Rela *);
1114 /* This function, if defined, removes information about discarded functions
1115 from other sections which mention them. */
1116 bfd_boolean (*elf_backend_discard_info)
1117 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1119 /* This function, if defined, signals that the function above has removed
1120 the discarded relocations for this section. */
1121 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1124 /* What to do when ld finds relocations against symbols defined in
1125 discarded sections. */
1126 unsigned int (*action_discarded)
1129 /* This function returns the width of FDE pointers in bytes, or 0 if
1130 that can't be determined for some reason. The default definition
1131 goes by the bfd's EI_CLASS. */
1132 unsigned int (*elf_backend_eh_frame_address_size)
1133 (bfd *, asection *);
1135 /* These functions tell elf-eh-frame whether to attempt to turn
1136 absolute or lsda encodings into pc-relative ones. The default
1137 definition enables these transformations. */
1138 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1139 (bfd *, struct bfd_link_info *, asection *);
1140 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1141 (bfd *, struct bfd_link_info *, asection *);
1143 /* This function returns an encoding after computing the encoded
1144 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1145 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1146 The default definition chooses a 32-bit PC-relative encoding. */
1147 bfd_byte (*elf_backend_encode_eh_address)
1148 (bfd *abfd, struct bfd_link_info *info,
1149 asection *osec, bfd_vma offset,
1150 asection *loc_sec, bfd_vma loc_offset,
1153 /* This function, if defined, may write out the given section.
1154 Returns TRUE if it did so and FALSE if the caller should. */
1155 bfd_boolean (*elf_backend_write_section)
1156 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1158 /* The level of IRIX compatibility we're striving for.
1159 MIPS ELF specific function. */
1160 irix_compat_t (*elf_backend_mips_irix_compat)
1163 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1164 (unsigned int, bfd_boolean);
1166 /* The swapping table to use when dealing with ECOFF information.
1167 Used for the MIPS ELF .mdebug section. */
1168 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1170 /* This function implements `bfd_elf_bfd_from_remote_memory';
1171 see elf.c, elfcode.h. */
1172 bfd *(*elf_backend_bfd_from_remote_memory)
1173 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1174 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1176 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1178 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1180 /* Is symbol defined in common section? */
1181 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1183 /* Return a common section index for section. */
1184 unsigned int (*common_section_index) (asection *);
1186 /* Return a common section for section. */
1187 asection *(*common_section) (asection *);
1189 /* Return TRUE if we can merge 2 definitions. */
1190 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1191 struct elf_link_hash_entry **,
1192 struct elf_link_hash_entry *,
1193 Elf_Internal_Sym *, asection **,
1194 bfd_vma *, unsigned int *,
1195 bfd_boolean *, bfd_boolean *,
1196 bfd_boolean *, bfd_boolean *,
1197 bfd_boolean *, bfd_boolean *,
1198 bfd_boolean *, bfd_boolean *,
1200 bfd_boolean *, bfd_boolean *,
1201 bfd_boolean *, bfd_boolean *,
1202 bfd *, asection **);
1204 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1205 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1207 /* Return TRUE if type is a function symbol type. */
1208 bfd_boolean (*is_function_type) (unsigned int type);
1210 /* Used to handle bad SHF_LINK_ORDER input. */
1211 bfd_error_handler_type link_order_error_handler;
1213 /* Name of the PLT relocation section. */
1214 const char *relplt_name;
1216 /* Alternate EM_xxxx machine codes for this backend. */
1217 int elf_machine_alt1;
1218 int elf_machine_alt2;
1220 const struct elf_size_info *s;
1222 /* An array of target specific special sections. */
1223 const struct bfd_elf_special_section *special_sections;
1225 /* The size in bytes of the header for the GOT. This includes the
1226 so-called reserved entries on some systems. */
1227 bfd_vma got_header_size;
1229 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1230 otherwise by the local symbol with index SYMNDX in IBFD. */
1231 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1232 struct elf_link_hash_entry *h,
1233 bfd *ibfd, unsigned long symndx);
1235 /* The vendor name to use for a processor-standard attributes section. */
1236 const char *obj_attrs_vendor;
1238 /* The section name to use for a processor-standard attributes section. */
1239 const char *obj_attrs_section;
1241 /* Return 1, 2 or 3 to indicate what type of arguments a
1242 processor-specific tag takes. */
1243 int (*obj_attrs_arg_type) (int);
1245 /* The section type to use for an attributes section. */
1246 unsigned int obj_attrs_section_type;
1248 /* This function determines the order in which any attributes are written.
1249 It must be defined for input in the range 4..NUM_KNOWN_OBJ_ATTRIBUTES-1
1250 (this range is used in order to make unity easy). The returned value is
1251 the actual tag number to place in the input position. */
1252 int (*obj_attrs_order) (int);
1254 /* This is TRUE if the linker should act like collect and gather
1255 global constructors and destructors by name. This is TRUE for
1256 MIPS ELF because the Irix 5 tools can not handle the .init
1258 unsigned collect : 1;
1260 /* This is TRUE if the linker should ignore changes to the type of a
1261 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1262 record undefined functions as STT_OBJECT although the definitions
1264 unsigned type_change_ok : 1;
1266 /* Whether the backend may use REL relocations. (Some backends use
1267 both REL and RELA relocations, and this flag is set for those
1269 unsigned may_use_rel_p : 1;
1271 /* Whether the backend may use RELA relocations. (Some backends use
1272 both REL and RELA relocations, and this flag is set for those
1274 unsigned may_use_rela_p : 1;
1276 /* Whether the default relocation type is RELA. If a backend with
1277 this flag set wants REL relocations for a particular section,
1278 it must note that explicitly. Similarly, if this flag is clear,
1279 and the backend wants RELA relocations for a particular
1281 unsigned default_use_rela_p : 1;
1283 /* True if PLT and copy relocations should be RELA by default. */
1284 unsigned rela_plts_and_copies_p : 1;
1286 /* Set if RELA relocations for a relocatable link can be handled by
1287 generic code. Backends that set this flag need do nothing in the
1288 backend relocate_section routine for relocatable linking. */
1289 unsigned rela_normal : 1;
1291 /* TRUE if addresses "naturally" sign extend. This is used when
1292 swapping in from Elf32 when BFD64. */
1293 unsigned sign_extend_vma : 1;
1295 unsigned want_got_plt : 1;
1296 unsigned plt_readonly : 1;
1297 unsigned want_plt_sym : 1;
1298 unsigned plt_not_loaded : 1;
1299 unsigned plt_alignment : 4;
1300 unsigned can_gc_sections : 1;
1301 unsigned can_refcount : 1;
1302 unsigned want_got_sym : 1;
1303 unsigned want_dynbss : 1;
1305 /* Targets which do not support physical addressing often require
1306 that the p_paddr field in the section header to be set to zero.
1307 This field indicates whether this behavior is required. */
1308 unsigned want_p_paddr_set_to_zero : 1;
1310 /* True if an object file lacking a .note.GNU-stack section
1311 should be assumed to be requesting exec stack. At least one
1312 other file in the link needs to have a .note.GNU-stack section
1313 for a PT_GNU_STACK segment to be created. */
1314 unsigned default_execstack : 1;
1317 /* Information stored for each BFD section in an ELF file. This
1318 structure is allocated by elf_new_section_hook. */
1320 struct bfd_elf_section_data
1322 /* The ELF header for this section. */
1323 Elf_Internal_Shdr this_hdr;
1325 /* The ELF header for the reloc section associated with this
1327 Elf_Internal_Shdr rel_hdr;
1329 /* If there is a second reloc section associated with this section,
1330 as can happen on Irix 6, this field points to the header. */
1331 Elf_Internal_Shdr *rel_hdr2;
1333 /* The number of relocations currently assigned to REL_HDR. */
1334 unsigned int rel_count;
1336 /* The number of relocations currently assigned to REL_HDR2. */
1337 unsigned int rel_count2;
1339 /* The ELF section number of this section. */
1342 /* The ELF section number of the reloc section indicated by
1343 REL_HDR if any. Only used for an output file. */
1346 /* The ELF section number of the reloc section indicated by
1347 REL_HDR2 if any. Only used for an output file. */
1350 /* Used by the backend linker when generating a shared library to
1351 record the dynamic symbol index for a section symbol
1352 corresponding to this section. A value of 0 means that there is
1353 no dynamic symbol for this section. */
1356 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1357 asection *linked_to;
1359 /* Used by the backend linker to store the symbol hash table entries
1360 associated with relocs against global symbols. */
1361 struct elf_link_hash_entry **rel_hashes;
1363 /* A pointer to the swapped relocs. If the section uses REL relocs,
1364 rather than RELA, all the r_addend fields will be zero. This
1365 pointer may be NULL. It is used by the backend linker. */
1366 Elf_Internal_Rela *relocs;
1368 /* A pointer to a linked list tracking dynamic relocs copied for
1372 /* A pointer to the bfd section used for dynamic relocs. */
1376 /* Group name, if this section is a member of a group. */
1379 /* Group signature sym, if this is the SHT_GROUP section. */
1380 struct bfd_symbol *id;
1383 /* For a member of a group, points to the SHT_GROUP section.
1384 NULL for the SHT_GROUP section itself and non-group sections. */
1385 asection *sec_group;
1387 /* A linked list of member sections in the group. Circular when used by
1388 the linker. For the SHT_GROUP section, points at first member. */
1389 asection *next_in_group;
1391 /* The FDEs associated with this section. The u.fde.next_in_section
1392 field acts as a chain pointer. */
1393 struct eh_cie_fde *fde_list;
1395 /* A pointer used for various section optimizations. */
1399 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1400 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1401 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1402 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1403 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1404 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1405 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1406 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1407 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1409 #define xvec_get_elf_backend_data(xvec) \
1410 ((const struct elf_backend_data *) (xvec)->backend_data)
1412 #define get_elf_backend_data(abfd) \
1413 xvec_get_elf_backend_data ((abfd)->xvec)
1415 /* The maximum number of known object attributes for any target. */
1416 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1418 /* The value of an object attribute. The type indicates whether the attribute
1419 holds and integer, a string, or both. It can also indicate that there can
1420 be no default (i.e. all values must be written to file, even zero). */
1422 typedef struct obj_attribute
1424 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1425 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1426 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1428 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1429 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1430 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1437 typedef struct obj_attribute_list
1439 struct obj_attribute_list *next;
1442 } obj_attribute_list;
1444 /* Object attributes may either be defined by the processor ABI, index
1445 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1446 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1447 #define OBJ_ATTR_PROC 0
1448 #define OBJ_ATTR_GNU 1
1449 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1450 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1452 /* The following object attribute tags are taken as generic, for all
1453 targets and for "gnu" where there is no target standard. */
1460 Tag_compatibility = 32
1463 /* Some private data is stashed away for future use using the tdata pointer
1464 in the bfd structure. */
1466 struct elf_obj_tdata
1468 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1469 Elf_Internal_Shdr **elf_sect_ptr;
1470 Elf_Internal_Phdr *phdr;
1471 struct elf_segment_map *segment_map;
1472 struct elf_strtab_hash *strtab_ptr;
1475 unsigned int num_elf_sections; /* elf_sect_ptr size */
1476 int num_section_syms;
1477 asymbol **section_syms; /* STT_SECTION symbols for each section */
1478 Elf_Internal_Shdr symtab_hdr;
1479 Elf_Internal_Shdr shstrtab_hdr;
1480 Elf_Internal_Shdr strtab_hdr;
1481 Elf_Internal_Shdr dynsymtab_hdr;
1482 Elf_Internal_Shdr dynstrtab_hdr;
1483 Elf_Internal_Shdr dynversym_hdr;
1484 Elf_Internal_Shdr dynverref_hdr;
1485 Elf_Internal_Shdr dynverdef_hdr;
1486 Elf_Internal_Shdr symtab_shndx_hdr;
1487 unsigned int symtab_section, shstrtab_section;
1488 unsigned int strtab_section, dynsymtab_section;
1489 unsigned int symtab_shndx_section;
1490 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1491 file_ptr next_file_pos;
1492 bfd_vma gp; /* The gp value */
1493 unsigned int gp_size; /* The gp size */
1495 /* Information grabbed from an elf core file. */
1502 /* A mapping from external symbols to entries in the linker hash
1503 table, used when linking. This is indexed by the symbol index
1504 minus the sh_info field of the symbol table header. */
1505 struct elf_link_hash_entry **sym_hashes;
1507 /* Track usage and final offsets of GOT entries for local symbols.
1508 This array is indexed by symbol index. Elements are used
1509 identically to "got" in struct elf_link_hash_entry. */
1512 bfd_signed_vma *refcounts;
1514 struct got_entry **ents;
1517 /* The linker ELF emulation code needs to let the backend ELF linker
1518 know what filename should be used for a dynamic object if the
1519 dynamic object is found using a search. The emulation code then
1520 sometimes needs to know what name was actually used. Until the
1521 file has been added to the linker symbol table, this field holds
1522 the name the linker wants. After it has been added, it holds the
1523 name actually used, which will be the DT_SONAME entry if there is
1525 const char *dt_name;
1527 /* The linker emulation needs to know what audit libs
1528 are used by a dynamic object. */
1529 const char *dt_audit;
1531 /* Records the result of `get_program_header_size'. */
1532 bfd_size_type program_header_size;
1534 /* Used by find_nearest_line entry point. */
1537 /* Used by MIPS ELF find_nearest_line entry point. The structure
1538 could be included directly in this one, but there's no point to
1539 wasting the memory just for the infrequently called
1540 find_nearest_line. */
1541 struct mips_elf_find_line *find_line_info;
1543 /* A place to stash dwarf1 info for this bfd. */
1544 struct dwarf1_debug *dwarf1_find_line_info;
1546 /* A place to stash dwarf2 info for this bfd. */
1547 void *dwarf2_find_line_info;
1549 /* An array of stub sections indexed by symbol number, used by the
1550 MIPS ELF linker. FIXME: We should figure out some way to only
1551 include this field for a MIPS ELF target. */
1552 asection **local_stubs;
1553 asection **local_call_stubs;
1555 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1557 asection *eh_frame_hdr;
1559 Elf_Internal_Shdr **group_sect_ptr;
1562 /* Number of symbol version definitions we are about to emit. */
1563 unsigned int cverdefs;
1565 /* Number of symbol version references we are about to emit. */
1566 unsigned int cverrefs;
1568 /* Segment flags for the PT_GNU_STACK segment. */
1569 unsigned int stack_flags;
1571 /* Symbol version definitions in external objects. */
1572 Elf_Internal_Verdef *verdef;
1574 /* Symbol version references to external objects. */
1575 Elf_Internal_Verneed *verref;
1577 /* The Irix 5 support uses two virtual sections, which represent
1578 text/data symbols defined in dynamic objects. */
1579 asymbol *elf_data_symbol;
1580 asymbol *elf_text_symbol;
1581 asection *elf_data_section;
1582 asection *elf_text_section;
1584 /* A pointer to the .eh_frame section. */
1585 asection *eh_frame_section;
1587 /* Whether a dyanmic object was specified normally on the linker
1588 command line, or was specified when --as-needed was in effect,
1589 or was found via a DT_NEEDED entry. */
1590 enum dynamic_lib_link_class dyn_lib_class;
1592 /* This is set to TRUE if the object was created by the backend
1596 /* Irix 5 often screws up the symbol table, sorting local symbols
1597 after global symbols. This flag is set if the symbol table in
1598 this BFD appears to be screwed up. If it is, we ignore the
1599 sh_info field in the symbol table header, and always read all the
1601 bfd_boolean bad_symtab;
1603 /* Used to determine if the e_flags field has been initialized */
1604 bfd_boolean flags_init;
1606 /* Symbol buffer. */
1609 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1610 obj_attribute_list *other_obj_attributes[2];
1612 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1613 bfd_boolean (*after_write_object_contents) (bfd *);
1614 void *after_write_object_contents_info;
1616 /* NT_GNU_BUILD_ID note type. */
1617 bfd_size_type build_id_size;
1620 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1621 symbol type. Used to set the osabi field in the ELF header
1623 bfd_boolean has_ifunc_symbols;
1625 /* An identifier used to distinguish different target
1626 specific extensions to this structure. */
1627 enum elf_target_id object_id;
1630 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1632 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1633 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1634 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1635 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1636 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1637 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1638 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1639 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1640 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1641 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1642 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1643 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1644 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1645 #define elf_eh_frame_section(bfd) \
1646 (elf_tdata(bfd) -> eh_frame_section)
1647 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1648 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1649 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1650 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1651 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1652 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1653 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1654 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1655 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1656 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1657 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1658 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1659 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1660 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1661 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1662 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1663 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1664 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1665 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1666 #define elf_known_obj_attributes_proc(bfd) \
1667 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1668 #define elf_other_obj_attributes_proc(bfd) \
1669 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1671 extern void _bfd_elf_swap_verdef_in
1672 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1673 extern void _bfd_elf_swap_verdef_out
1674 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1675 extern void _bfd_elf_swap_verdaux_in
1676 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1677 extern void _bfd_elf_swap_verdaux_out
1678 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1679 extern void _bfd_elf_swap_verneed_in
1680 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1681 extern void _bfd_elf_swap_verneed_out
1682 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1683 extern void _bfd_elf_swap_vernaux_in
1684 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1685 extern void _bfd_elf_swap_vernaux_out
1686 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1687 extern void _bfd_elf_swap_versym_in
1688 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1689 extern void _bfd_elf_swap_versym_out
1690 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1692 extern unsigned int _bfd_elf_section_from_bfd_section
1693 (bfd *, asection *);
1694 extern char *bfd_elf_string_from_elf_section
1695 (bfd *, unsigned, unsigned);
1696 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1697 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1698 Elf_External_Sym_Shndx *);
1699 extern const char *bfd_elf_sym_name
1700 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1702 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1704 extern bfd_boolean _bfd_elf_print_private_bfd_data
1706 extern void bfd_elf_print_symbol
1707 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1709 extern unsigned int _bfd_elf_eh_frame_address_size
1710 (bfd *, asection *);
1711 extern bfd_byte _bfd_elf_encode_eh_address
1712 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1713 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1714 extern bfd_boolean _bfd_elf_can_make_relative
1715 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1717 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1718 (const Elf_Internal_Rela *);
1719 extern bfd_vma _bfd_elf_rela_local_sym
1720 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1721 extern bfd_vma _bfd_elf_rel_local_sym
1722 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1723 extern bfd_vma _bfd_elf_section_offset
1724 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1726 extern unsigned long bfd_elf_hash
1728 extern unsigned long bfd_elf_gnu_hash
1731 extern bfd_reloc_status_type bfd_elf_generic_reloc
1732 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1733 extern bfd_boolean bfd_elf_allocate_object
1734 (bfd *, size_t, enum elf_target_id);
1735 extern bfd_boolean bfd_elf_make_generic_object
1737 extern bfd_boolean bfd_elf_mkcorefile
1739 extern bfd_boolean _bfd_elf_make_section_from_shdr
1740 (bfd *, Elf_Internal_Shdr *, const char *, int);
1741 extern bfd_boolean _bfd_elf_make_section_from_phdr
1742 (bfd *, Elf_Internal_Phdr *, int, const char *);
1743 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1744 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1745 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1747 extern void _bfd_elf_link_hash_copy_indirect
1748 (struct bfd_link_info *, struct elf_link_hash_entry *,
1749 struct elf_link_hash_entry *);
1750 extern void _bfd_elf_link_hash_hide_symbol
1751 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1752 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1753 (struct bfd_link_info *, struct elf_link_hash_entry *);
1754 extern bfd_boolean _bfd_elf_link_hash_table_init
1755 (struct elf_link_hash_table *, bfd *,
1756 struct bfd_hash_entry *(*)
1757 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1758 unsigned int, enum elf_target_id);
1759 extern bfd_boolean _bfd_elf_slurp_version_tables
1760 (bfd *, bfd_boolean);
1761 extern bfd_boolean _bfd_elf_merge_sections
1762 (bfd *, struct bfd_link_info *);
1763 extern bfd_boolean _bfd_elf_match_sections_by_type
1764 (bfd *, const asection *, bfd *, const asection *);
1765 extern bfd_boolean bfd_elf_is_group_section
1766 (bfd *, const struct bfd_section *);
1767 extern void _bfd_elf_section_already_linked
1768 (bfd *, struct bfd_section *, struct bfd_link_info *);
1769 extern void bfd_elf_set_group_contents
1770 (bfd *, asection *, void *);
1771 extern asection *_bfd_elf_check_kept_section
1772 (asection *, struct bfd_link_info *);
1773 extern void _bfd_elf_link_just_syms
1774 (asection *, struct bfd_link_info *);
1775 extern void _bfd_elf_copy_link_hash_symbol_type
1776 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1777 extern bfd_boolean _bfd_elf_size_group_sections
1778 (struct bfd_link_info *);
1779 extern bfd_boolean _bfd_elf_fixup_group_sections
1780 (bfd *, asection *);
1781 extern bfd_boolean _bfd_elf_copy_private_header_data
1783 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1784 (bfd *, asymbol *, bfd *, asymbol *);
1785 #define _bfd_generic_init_private_section_data \
1786 _bfd_elf_init_private_section_data
1787 extern bfd_boolean _bfd_elf_init_private_section_data
1788 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1789 extern bfd_boolean _bfd_elf_copy_private_section_data
1790 (bfd *, asection *, bfd *, asection *);
1791 extern bfd_boolean _bfd_elf_write_object_contents
1793 extern bfd_boolean _bfd_elf_write_corefile_contents
1795 extern bfd_boolean _bfd_elf_set_section_contents
1796 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1797 extern long _bfd_elf_get_symtab_upper_bound
1799 extern long _bfd_elf_canonicalize_symtab
1800 (bfd *, asymbol **);
1801 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1803 extern long _bfd_elf_canonicalize_dynamic_symtab
1804 (bfd *, asymbol **);
1805 extern long _bfd_elf_get_synthetic_symtab
1806 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1807 extern long _bfd_elf_get_reloc_upper_bound
1809 extern long _bfd_elf_canonicalize_reloc
1810 (bfd *, sec_ptr, arelent **, asymbol **);
1811 extern asection * _bfd_elf_get_dynamic_reloc_section
1812 (bfd *, asection *, bfd_boolean);
1813 extern asection * _bfd_elf_make_dynamic_reloc_section
1814 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1815 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1817 extern long _bfd_elf_canonicalize_dynamic_reloc
1818 (bfd *, arelent **, asymbol **);
1819 extern asymbol *_bfd_elf_make_empty_symbol
1821 extern void _bfd_elf_get_symbol_info
1822 (bfd *, asymbol *, symbol_info *);
1823 extern bfd_boolean _bfd_elf_is_local_label_name
1824 (bfd *, const char *);
1825 extern alent *_bfd_elf_get_lineno
1827 extern bfd_boolean _bfd_elf_set_arch_mach
1828 (bfd *, enum bfd_architecture, unsigned long);
1829 extern bfd_boolean _bfd_elf_find_nearest_line
1830 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1832 extern bfd_boolean _bfd_elf_find_line
1833 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1834 #define _bfd_generic_find_line _bfd_elf_find_line
1835 extern bfd_boolean _bfd_elf_find_inliner_info
1836 (bfd *, const char **, const char **, unsigned int *);
1837 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1838 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1839 extern int _bfd_elf_sizeof_headers
1840 (bfd *, struct bfd_link_info *);
1841 extern bfd_boolean _bfd_elf_new_section_hook
1842 (bfd *, asection *);
1843 extern bfd_boolean _bfd_elf_init_reloc_shdr
1844 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1845 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1846 (const char *, const struct bfd_elf_special_section *, unsigned int);
1847 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1848 (bfd *, asection *);
1850 /* If the target doesn't have reloc handling written yet: */
1851 extern void _bfd_elf_no_info_to_howto
1852 (bfd *, arelent *, Elf_Internal_Rela *);
1854 extern bfd_boolean bfd_section_from_shdr
1855 (bfd *, unsigned int shindex);
1856 extern bfd_boolean bfd_section_from_phdr
1857 (bfd *, Elf_Internal_Phdr *, int);
1859 extern int _bfd_elf_symbol_from_bfd_symbol
1860 (bfd *, asymbol **);
1862 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1863 (struct sym_cache *, bfd *, unsigned long);
1864 extern asection *bfd_section_from_elf_index
1865 (bfd *, unsigned int);
1866 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1869 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1871 extern void _bfd_elf_strtab_free
1872 (struct elf_strtab_hash *);
1873 extern bfd_size_type _bfd_elf_strtab_add
1874 (struct elf_strtab_hash *, const char *, bfd_boolean);
1875 extern void _bfd_elf_strtab_addref
1876 (struct elf_strtab_hash *, bfd_size_type);
1877 extern void _bfd_elf_strtab_delref
1878 (struct elf_strtab_hash *, bfd_size_type);
1879 extern void _bfd_elf_strtab_clear_all_refs
1880 (struct elf_strtab_hash *);
1881 extern bfd_size_type _bfd_elf_strtab_size
1882 (struct elf_strtab_hash *);
1883 extern bfd_size_type _bfd_elf_strtab_offset
1884 (struct elf_strtab_hash *, bfd_size_type);
1885 extern bfd_boolean _bfd_elf_strtab_emit
1886 (bfd *, struct elf_strtab_hash *);
1887 extern void _bfd_elf_strtab_finalize
1888 (struct elf_strtab_hash *);
1890 extern void _bfd_elf_begin_eh_frame_parsing
1891 (struct bfd_link_info *info);
1892 extern void _bfd_elf_parse_eh_frame
1893 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1894 extern void _bfd_elf_end_eh_frame_parsing
1895 (struct bfd_link_info *info);
1897 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1898 (bfd *, struct bfd_link_info *, asection *,
1899 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1900 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1901 (bfd *, struct bfd_link_info *);
1902 extern bfd_vma _bfd_elf_eh_frame_section_offset
1903 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1904 extern bfd_boolean _bfd_elf_write_section_eh_frame
1905 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1906 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1907 (bfd *, struct bfd_link_info *);
1908 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1909 (struct bfd_link_info *);
1911 extern bfd_boolean _bfd_elf_merge_symbol
1912 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1913 asection **, bfd_vma *, unsigned int *,
1914 struct elf_link_hash_entry **, bfd_boolean *,
1915 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1917 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1919 extern long _bfd_elf_link_lookup_local_dynindx
1920 (struct bfd_link_info *, bfd *, long);
1921 extern bfd_boolean _bfd_elf_compute_section_file_positions
1922 (bfd *, struct bfd_link_info *);
1923 extern void _bfd_elf_assign_file_positions_for_relocs
1925 extern file_ptr _bfd_elf_assign_file_position_for_section
1926 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1928 extern bfd_boolean _bfd_elf_validate_reloc
1931 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1932 (bfd *, struct bfd_link_info *);
1933 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1934 (bfd *, struct bfd_link_info *, asection *);
1935 extern bfd_boolean _bfd_elf_create_dynamic_sections
1936 (bfd *, struct bfd_link_info *);
1937 extern bfd_boolean _bfd_elf_create_got_section
1938 (bfd *, struct bfd_link_info *);
1939 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1940 (bfd *, struct bfd_link_info *, asection *, const char *);
1941 extern void _bfd_elf_init_1_index_section
1942 (bfd *, struct bfd_link_info *);
1943 extern void _bfd_elf_init_2_index_sections
1944 (bfd *, struct bfd_link_info *);
1946 extern bfd_boolean _bfd_elfcore_make_pseudosection
1947 (bfd *, char *, size_t, ufile_ptr);
1948 extern char *_bfd_elfcore_strndup
1949 (bfd *, char *, size_t);
1951 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1952 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1954 extern bfd_boolean _bfd_elf_link_output_relocs
1955 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1956 struct elf_link_hash_entry **);
1958 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1959 (struct elf_link_hash_entry *, asection *);
1961 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1962 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1964 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1965 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1967 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1968 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1970 extern bfd_boolean _bfd_elf_setup_sections
1973 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1975 extern const bfd_target *bfd_elf32_object_p
1977 extern const bfd_target *bfd_elf32_core_file_p
1979 extern char *bfd_elf32_core_file_failing_command
1981 extern int bfd_elf32_core_file_failing_signal
1983 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1986 extern bfd_boolean bfd_elf32_swap_symbol_in
1987 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1988 extern void bfd_elf32_swap_symbol_out
1989 (bfd *, const Elf_Internal_Sym *, void *, void *);
1990 extern void bfd_elf32_swap_reloc_in
1991 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1992 extern void bfd_elf32_swap_reloc_out
1993 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1994 extern void bfd_elf32_swap_reloca_in
1995 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1996 extern void bfd_elf32_swap_reloca_out
1997 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1998 extern void bfd_elf32_swap_phdr_in
1999 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2000 extern void bfd_elf32_swap_phdr_out
2001 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2002 extern void bfd_elf32_swap_dyn_in
2003 (bfd *, const void *, Elf_Internal_Dyn *);
2004 extern void bfd_elf32_swap_dyn_out
2005 (bfd *, const Elf_Internal_Dyn *, void *);
2006 extern long bfd_elf32_slurp_symbol_table
2007 (bfd *, asymbol **, bfd_boolean);
2008 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2010 extern int bfd_elf32_write_out_phdrs
2011 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2012 extern bfd_boolean bfd_elf32_checksum_contents
2013 (bfd * , void (*) (const void *, size_t, void *), void *);
2014 extern void bfd_elf32_write_relocs
2015 (bfd *, asection *, void *);
2016 extern bfd_boolean bfd_elf32_slurp_reloc_table
2017 (bfd *, asection *, asymbol **, bfd_boolean);
2019 extern const bfd_target *bfd_elf64_object_p
2021 extern const bfd_target *bfd_elf64_core_file_p
2023 extern char *bfd_elf64_core_file_failing_command
2025 extern int bfd_elf64_core_file_failing_signal
2027 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2030 extern bfd_boolean bfd_elf64_swap_symbol_in
2031 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2032 extern void bfd_elf64_swap_symbol_out
2033 (bfd *, const Elf_Internal_Sym *, void *, void *);
2034 extern void bfd_elf64_swap_reloc_in
2035 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2036 extern void bfd_elf64_swap_reloc_out
2037 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2038 extern void bfd_elf64_swap_reloca_in
2039 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2040 extern void bfd_elf64_swap_reloca_out
2041 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2042 extern void bfd_elf64_swap_phdr_in
2043 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2044 extern void bfd_elf64_swap_phdr_out
2045 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2046 extern void bfd_elf64_swap_dyn_in
2047 (bfd *, const void *, Elf_Internal_Dyn *);
2048 extern void bfd_elf64_swap_dyn_out
2049 (bfd *, const Elf_Internal_Dyn *, void *);
2050 extern long bfd_elf64_slurp_symbol_table
2051 (bfd *, asymbol **, bfd_boolean);
2052 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2054 extern int bfd_elf64_write_out_phdrs
2055 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2056 extern bfd_boolean bfd_elf64_checksum_contents
2057 (bfd * , void (*) (const void *, size_t, void *), void *);
2058 extern void bfd_elf64_write_relocs
2059 (bfd *, asection *, void *);
2060 extern bfd_boolean bfd_elf64_slurp_reloc_table
2061 (bfd *, asection *, asymbol **, bfd_boolean);
2063 extern bfd_boolean _bfd_elf_default_relocs_compatible
2064 (const bfd_target *, const bfd_target *);
2066 extern bfd_boolean _bfd_elf_relocs_compatible
2067 (const bfd_target *, const bfd_target *);
2069 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2070 (bfd *, struct bfd_link_info *, const char *);
2071 extern bfd_boolean bfd_elf_link_add_symbols
2072 (bfd *, struct bfd_link_info *);
2073 extern bfd_boolean _bfd_elf_add_dynamic_entry
2074 (struct bfd_link_info *, bfd_vma, bfd_vma);
2076 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2077 (struct bfd_link_info *, struct elf_link_hash_entry *);
2079 extern int bfd_elf_link_record_local_dynamic_symbol
2080 (struct bfd_link_info *, bfd *, long);
2082 extern bfd_boolean _bfd_elf_close_and_cleanup
2085 extern bfd_boolean _bfd_elf_common_definition
2086 (Elf_Internal_Sym *);
2088 extern unsigned int _bfd_elf_common_section_index
2091 extern asection *_bfd_elf_common_section
2094 extern void _bfd_dwarf2_cleanup_debug_info
2097 extern bfd_vma _bfd_elf_default_got_elt_size
2098 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2101 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2102 (bfd *, arelent *, struct bfd_symbol *, void *,
2103 asection *, bfd *, char **);
2105 extern bfd_boolean bfd_elf_final_link
2106 (bfd *, struct bfd_link_info *);
2108 extern void _bfd_elf_gc_keep
2109 (struct bfd_link_info *info);
2111 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2112 (struct elf_link_hash_entry *h, void *inf);
2114 extern bfd_boolean bfd_elf_gc_sections
2115 (bfd *, struct bfd_link_info *);
2117 extern bfd_boolean bfd_elf_gc_record_vtinherit
2118 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2120 extern bfd_boolean bfd_elf_gc_record_vtentry
2121 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2123 extern asection *_bfd_elf_gc_mark_hook
2124 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2125 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2127 extern asection *_bfd_elf_gc_mark_rsec
2128 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2129 struct elf_reloc_cookie *);
2131 extern bfd_boolean _bfd_elf_gc_mark_reloc
2132 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2133 struct elf_reloc_cookie *);
2135 extern bfd_boolean _bfd_elf_gc_mark_fdes
2136 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2137 struct elf_reloc_cookie *);
2139 extern bfd_boolean _bfd_elf_gc_mark
2140 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2142 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2143 (bfd *, struct bfd_link_info *);
2145 extern bfd_boolean bfd_elf_gc_common_final_link
2146 (bfd *, struct bfd_link_info *);
2148 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2151 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2152 (bfd *, asection *);
2154 extern bfd_boolean _bfd_elf_map_sections_to_segments
2155 (bfd *, struct bfd_link_info *);
2157 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2159 extern int bfd_elf_get_default_section_type (flagword);
2161 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2162 (bfd * abfd, asection * section);
2164 /* Exported interface for writing elf corefile notes. */
2165 extern char *elfcore_write_note
2166 (bfd *, char *, int *, const char *, int, const void *, int);
2167 extern char *elfcore_write_prpsinfo
2168 (bfd *, char *, int *, const char *, const char *);
2169 extern char *elfcore_write_prstatus
2170 (bfd *, char *, int *, long, int, const void *);
2171 extern char * elfcore_write_pstatus
2172 (bfd *, char *, int *, long, int, const void *);
2173 extern char *elfcore_write_prfpreg
2174 (bfd *, char *, int *, const void *, int);
2175 extern char *elfcore_write_prxfpreg
2176 (bfd *, char *, int *, const void *, int);
2177 extern char *elfcore_write_xstatereg
2178 (bfd *, char *, int *, const void *, int);
2179 extern char *elfcore_write_ppc_vmx
2180 (bfd *, char *, int *, const void *, int);
2181 extern char *elfcore_write_ppc_vsx
2182 (bfd *, char *, int *, const void *, int);
2183 extern char *elfcore_write_s390_timer
2184 (bfd *, char *, int *, const void *, int);
2185 extern char *elfcore_write_s390_todcmp
2186 (bfd *, char *, int *, const void *, int);
2187 extern char *elfcore_write_s390_todpreg
2188 (bfd *, char *, int *, const void *, int);
2189 extern char *elfcore_write_s390_ctrs
2190 (bfd *, char *, int *, const void *, int);
2191 extern char *elfcore_write_s390_prefix
2192 (bfd *, char *, int *, const void *, int);
2193 extern char *elfcore_write_lwpstatus
2194 (bfd *, char *, int *, long, int, const void *);
2195 extern char *elfcore_write_register_note
2196 (bfd *, char *, int *, const char *, const void *, int);
2198 extern bfd *_bfd_elf32_bfd_from_remote_memory
2199 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2200 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2201 extern bfd *_bfd_elf64_bfd_from_remote_memory
2202 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2203 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2205 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2206 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2207 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2208 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2209 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2210 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2211 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2212 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2213 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2214 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2216 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2217 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2220 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2221 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2222 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2223 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2224 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2226 /* The linker may needs to keep track of the number of relocs that it
2227 decides to copy as dynamic relocs in check_relocs for each symbol.
2228 This is so that it can later discard them if they are found to be
2229 unnecessary. We can store the information in a field extending the
2230 regular ELF linker hash table. */
2232 struct elf_dyn_relocs
2234 struct elf_dyn_relocs *next;
2236 /* The input section of the reloc. */
2239 /* Total number of relocs copied for the input section. */
2240 bfd_size_type count;
2242 /* Number of pc-relative relocs copied for the input section. */
2243 bfd_size_type pc_count;
2246 extern bfd_boolean _bfd_elf_create_ifunc_sections
2247 (bfd *, struct bfd_link_info *);
2248 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2249 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2250 struct elf_dyn_relocs **);
2251 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2252 (struct bfd_link_info *, struct elf_link_hash_entry *,
2253 struct elf_dyn_relocs **, unsigned int, unsigned int);
2255 /* Large common section. */
2256 extern asection _bfd_elf_large_com_section;
2258 /* Hash for local symbol with the first section id, ID, in the input
2259 file and the local symbol index, SYM. */
2260 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2261 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2262 ^ (SYM) ^ ((ID) >> 16))
2264 /* This is the condition under which finish_dynamic_symbol will be called.
2265 If our finish_dynamic_symbol isn't called, we'll need to do something
2266 about initializing any .plt and .got entries in relocate_section. */
2267 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2269 && ((SHARED) || !(H)->forced_local) \
2270 && ((H)->dynindx != -1 || (H)->forced_local))
2272 /* This macro is to avoid lots of duplicated code in the body
2273 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2274 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2275 r_symndx, symtab_hdr, sym_hashes, \
2276 h, sec, relocation, \
2277 unresolved_reloc, warned) \
2280 /* It seems this can happen with erroneous or unsupported \
2281 input (mixing a.out and elf in an archive, for example.) */ \
2282 if (sym_hashes == NULL) \
2285 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2287 while (h->root.type == bfd_link_hash_indirect \
2288 || h->root.type == bfd_link_hash_warning) \
2289 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2292 unresolved_reloc = FALSE; \
2294 if (h->root.type == bfd_link_hash_defined \
2295 || h->root.type == bfd_link_hash_defweak) \
2297 sec = h->root.u.def.section; \
2299 || sec->output_section == NULL) \
2300 /* Set a flag that will be cleared later if we find a \
2301 relocation value for this symbol. output_section \
2302 is typically NULL for symbols satisfied by a shared \
2304 unresolved_reloc = TRUE; \
2306 relocation = (h->root.u.def.value \
2307 + sec->output_section->vma \
2308 + sec->output_offset); \
2310 else if (h->root.type == bfd_link_hash_undefweak) \
2312 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2313 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2315 else if (!info->relocatable) \
2318 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2319 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2320 if (!info->callbacks->undefined_symbol (info, \
2321 h->root.root.string, \
2324 rel->r_offset, err)) \
2331 /* Will a symbol be bound to the the definition within the shared
2332 library, if any. A unique symbol can never be bound locally. */
2333 #define SYMBOLIC_BIND(INFO, H) \
2334 (!(H)->unique_global \
2335 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2337 #endif /* _LIBELF_H_ */