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, 2011
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 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
157 unsigned int target_internal : 8;
159 /* Symbol is referenced by a non-shared object (other than the object
160 in which it is defined). */
161 unsigned int ref_regular : 1;
162 /* Symbol is defined by a non-shared object. */
163 unsigned int def_regular : 1;
164 /* Symbol is referenced by a shared object. */
165 unsigned int ref_dynamic : 1;
166 /* Symbol is defined by a shared object. */
167 unsigned int def_dynamic : 1;
168 /* Symbol has a non-weak reference from a non-shared object (other than
169 the object in which it is defined). */
170 unsigned int ref_regular_nonweak : 1;
171 /* Dynamic symbol has been adjustd. */
172 unsigned int dynamic_adjusted : 1;
173 /* Symbol needs a copy reloc. */
174 unsigned int needs_copy : 1;
175 /* Symbol needs a procedure linkage table entry. */
176 unsigned int needs_plt : 1;
177 /* Symbol appears in a non-ELF input file. */
178 unsigned int non_elf : 1;
179 /* Symbol should be marked as hidden in the version information. */
180 unsigned int hidden : 1;
181 /* Symbol was forced to local scope due to a version script file. */
182 unsigned int forced_local : 1;
183 /* Symbol was forced to be dynamic due to a version script file. */
184 unsigned int dynamic : 1;
185 /* Symbol was marked during garbage collection. */
186 unsigned int mark : 1;
187 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
188 not currently set by all the backends. */
189 unsigned int non_got_ref : 1;
190 /* Symbol has a definition in a shared object.
191 FIXME: There is no real need for this field if def_dynamic is never
192 cleared and all places that test def_dynamic also test def_regular. */
193 unsigned int dynamic_def : 1;
194 /* Symbol is weak in all shared objects. */
195 unsigned int dynamic_weak : 1;
196 /* Symbol is referenced with a relocation where C/C++ pointer equality
198 unsigned int pointer_equality_needed : 1;
199 /* Symbol is a unique global symbol. */
200 unsigned int unique_global : 1;
202 /* String table index in .dynstr if this is a dynamic symbol. */
203 unsigned long dynstr_index;
207 /* If this is a weak defined symbol from a dynamic object, this
208 field points to a defined symbol with the same value, if there is
209 one. Otherwise it is NULL. */
210 struct elf_link_hash_entry *weakdef;
212 /* Hash value of the name computed using the ELF hash function.
213 Used part way through size_dynamic_sections, after we've finished
215 unsigned long elf_hash_value;
218 /* Version information. */
221 /* This field is used for a symbol which is not defined in a
222 regular object. It points to the version information read in
223 from the dynamic object. */
224 Elf_Internal_Verdef *verdef;
225 /* This field is used for a symbol which is defined in a regular
226 object. It is set up in size_dynamic_sections. It points to
227 the version information we should write out for this symbol. */
228 struct bfd_elf_version_tree *vertree;
231 struct elf_link_virtual_table_entry *vtable;
234 /* Will references to this symbol always reference the symbol
236 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
237 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
239 /* Will _calls_ to this symbol always call the version in this object? */
240 #define SYMBOL_CALLS_LOCAL(INFO, H) \
241 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
243 /* Common symbols that are turned into definitions don't have the
244 DEF_REGULAR flag set, so they might appear to be undefined. */
245 #define ELF_COMMON_DEF_P(H) \
247 && !(H)->def_dynamic \
248 && (H)->root.type == bfd_link_hash_defined)
250 /* Records local symbols to be emitted in the dynamic symbol table. */
252 struct elf_link_local_dynamic_entry
254 struct elf_link_local_dynamic_entry *next;
256 /* The input bfd this symbol came from. */
259 /* The index of the local symbol being copied. */
262 /* The index in the outgoing dynamic symbol table. */
265 /* A copy of the input symbol. */
266 Elf_Internal_Sym isym;
269 struct elf_link_loaded_list
271 struct elf_link_loaded_list *next;
275 /* Structures used by the eh_frame optimization code. */
280 /* If REMOVED == 1, this is the CIE that the FDE originally used.
281 The CIE belongs to the same .eh_frame input section as the FDE.
283 If REMOVED == 0, this is the CIE that we have chosen to use for
284 the output FDE. The CIE's REMOVED field is also 0, but the CIE
285 might belong to a different .eh_frame input section from the FDE. */
286 struct eh_cie_fde *cie_inf;
287 struct eh_cie_fde *next_for_section;
290 /* CIEs have three states:
292 - REMOVED && !MERGED: Slated for removal because we haven't yet
293 proven that an FDE needs it. FULL_CIE, if nonnull, points to
294 more detailed information about the CIE.
296 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
297 which may not belong to the same input section.
299 - !REMOVED: We have decided to keep this CIE. SEC is the
300 .eh_frame input section that contains the CIE. */
302 struct cie *full_cie;
303 struct eh_cie_fde *merged_with;
307 /* The offset of the personality data from the start of the CIE,
308 or 0 if the CIE doesn't have any. */
309 unsigned int personality_offset : 8;
311 /* True if we have marked relocations associated with this CIE. */
312 unsigned int gc_mark : 1;
314 /* True if we have decided to turn an absolute LSDA encoding into
315 a PC-relative one. */
316 unsigned int make_lsda_relative : 1;
318 /* True if we have decided to turn an absolute personality
319 encoding into a PC-relative one. */
320 unsigned int make_per_encoding_relative : 1;
322 /* True if the CIE contains personality data and if that
323 data uses a PC-relative encoding. Always true when
324 make_per_encoding_relative is. */
325 unsigned int per_encoding_relative : 1;
327 /* True if we need to add an 'R' (FDE encoding) entry to the
328 CIE's augmentation data. */
329 unsigned int add_fde_encoding : 1;
331 /* True if we have merged this CIE with another. */
332 unsigned int merged : 1;
335 unsigned int pad1 : 18;
338 unsigned int reloc_index;
341 unsigned int new_offset;
342 unsigned int fde_encoding : 8;
343 unsigned int lsda_encoding : 8;
344 unsigned int lsda_offset : 8;
346 /* True if this entry represents a CIE, false if it represents an FDE. */
347 unsigned int cie : 1;
349 /* True if this entry is currently marked for removal. */
350 unsigned int removed : 1;
352 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
353 augmentation data, and an associated byte to each of the CIE's FDEs. */
354 unsigned int add_augmentation_size : 1;
356 /* True if we have decided to convert absolute FDE relocations into
357 relative ones. This applies to the first relocation in the FDE,
358 which is against the code that the FDE describes. */
359 unsigned int make_relative : 1;
362 unsigned int pad1 : 4;
364 unsigned int *set_loc;
367 struct eh_frame_sec_info
371 struct eh_cie_fde entry[1];
374 struct eh_frame_array_ent
382 struct eh_frame_hdr_info
386 unsigned int fde_count, array_count;
387 struct eh_frame_array_ent *array;
388 /* TRUE if we should try to merge CIEs between input sections. */
389 bfd_boolean merge_cies;
390 /* TRUE if all .eh_frames have been parsd. */
391 bfd_boolean parsed_eh_frames;
392 /* TRUE if .eh_frame_hdr should contain the sorted search table.
393 We build it if we successfully read all .eh_frame input sections
394 and recognize them. */
398 /* Enum used to identify target specific extensions to the elf_obj_tdata
399 and elf_link_hash_table structures. Note the enums deliberately start
400 from 1 so that we can detect an uninitialized field. The generic value
401 is last so that additions to this enum do not need to modify more than
434 /* ELF linker hash table. */
436 struct elf_link_hash_table
438 struct bfd_link_hash_table root;
440 /* An identifier used to distinguish different target
441 specific extensions to this structure. */
442 enum elf_target_id hash_table_id;
444 /* Whether we have created the special dynamic sections required
445 when linking against or generating a shared object. */
446 bfd_boolean dynamic_sections_created;
448 /* True if this target has relocatable executables, so needs dynamic
450 bfd_boolean is_relocatable_executable;
452 /* The BFD used to hold special sections created by the linker.
453 This will be the first BFD found which requires these sections to
457 /* The value to use when initialising got.refcount/offset and
458 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
459 the values are refcounts. Set to init_got_offset/init_plt_offset
460 in size_dynamic_sections when the values may be offsets. */
461 union gotplt_union init_got_refcount;
462 union gotplt_union init_plt_refcount;
464 /* The value to use for got.refcount/offset and plt.refcount/offset
465 when the values may be offsets. Normally (bfd_vma) -1. */
466 union gotplt_union init_got_offset;
467 union gotplt_union init_plt_offset;
469 /* The number of symbols found in the link which must be put into
470 the .dynsym section. */
471 bfd_size_type dynsymcount;
473 /* The string table of dynamic symbols, which becomes the .dynstr
475 struct elf_strtab_hash *dynstr;
477 /* The number of buckets in the hash table in the .hash section.
478 This is based on the number of dynamic symbols. */
479 bfd_size_type bucketcount;
481 /* A linked list of DT_NEEDED names found in dynamic objects
482 included in the link. */
483 struct bfd_link_needed_list *needed;
485 /* Sections in the output bfd that provides a section symbol
486 to be used by relocations emitted against local symbols.
487 Most targets will not use data_index_section. */
488 asection *text_index_section;
489 asection *data_index_section;
491 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
492 struct elf_link_hash_entry *hgot;
494 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
495 struct elf_link_hash_entry *hplt;
497 /* A pointer to information used to merge SEC_MERGE sections. */
500 /* Used to link stabs in sections. */
501 struct stab_info stab_info;
503 /* Used by eh_frame code when editing .eh_frame. */
504 struct eh_frame_hdr_info eh_info;
506 /* A linked list of local symbols to be added to .dynsym. */
507 struct elf_link_local_dynamic_entry *dynlocal;
509 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
510 objects included in the link. */
511 struct bfd_link_needed_list *runpath;
513 /* Cached first output tls section and size of PT_TLS segment. */
515 bfd_size_type tls_size;
517 /* A linked list of BFD's loaded in the link. */
518 struct elf_link_loaded_list *loaded;
520 /* Short-cuts to get to dynamic linker sections. */
532 /* Look up an entry in an ELF linker hash table. */
534 #define elf_link_hash_lookup(table, string, create, copy, follow) \
535 ((struct elf_link_hash_entry *) \
536 bfd_link_hash_lookup (&(table)->root, (string), (create), \
539 /* Traverse an ELF linker hash table. */
541 #define elf_link_hash_traverse(table, func, info) \
542 (bfd_link_hash_traverse \
544 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
547 /* Get the ELF linker hash table from a link_info structure. */
549 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
551 #define elf_hash_table_id(table) ((table) -> hash_table_id)
553 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
554 #define is_elf_hash_table(htab) \
555 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
557 /* Used by bfd_sym_from_r_symndx to cache a small number of local
559 #define LOCAL_SYM_CACHE_SIZE 32
563 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
564 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
567 /* Constant information held for an ELF backend. */
569 struct elf_size_info {
570 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
571 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
573 /* The size of entries in the .hash section. */
574 unsigned char sizeof_hash_entry;
576 /* The number of internal relocations to allocate per external
578 unsigned char int_rels_per_ext_rel;
579 /* We use some fixed size arrays. This should be large enough to
580 handle all back-ends. */
581 #define MAX_INT_RELS_PER_EXT_REL 3
583 unsigned char arch_size, log_file_align;
584 unsigned char elfclass, ev_current;
585 int (*write_out_phdrs)
586 (bfd *, const Elf_Internal_Phdr *, unsigned int);
588 (*write_shdrs_and_ehdr) (bfd *);
589 bfd_boolean (*checksum_contents)
590 (bfd * , void (*) (const void *, size_t, void *), void *);
592 (bfd *, asection *, void *);
593 bfd_boolean (*swap_symbol_in)
594 (bfd *, const void *, const void *, Elf_Internal_Sym *);
595 void (*swap_symbol_out)
596 (bfd *, const Elf_Internal_Sym *, void *, void *);
597 bfd_boolean (*slurp_reloc_table)
598 (bfd *, asection *, asymbol **, bfd_boolean);
599 long (*slurp_symbol_table)
600 (bfd *, asymbol **, bfd_boolean);
602 (bfd *, const void *, Elf_Internal_Dyn *);
604 (bfd *, const Elf_Internal_Dyn *, void *);
606 /* This function is called to swap in a REL relocation. If an
607 external relocation corresponds to more than one internal
608 relocation, then all relocations are swapped in at once. */
609 void (*swap_reloc_in)
610 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
612 /* This function is called to swap out a REL relocation. */
613 void (*swap_reloc_out)
614 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
616 /* This function is called to swap in a RELA relocation. If an
617 external relocation corresponds to more than one internal
618 relocation, then all relocations are swapped in at once. */
619 void (*swap_reloca_in)
620 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
622 /* This function is called to swap out a RELA relocation. */
623 void (*swap_reloca_out)
624 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
627 #define elf_symbol_from(ABFD,S) \
628 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
629 && (S)->the_bfd->tdata.elf_obj_data != 0) \
630 ? (elf_symbol_type *) (S) \
633 enum elf_reloc_type_class {
635 reloc_class_relative,
640 struct elf_reloc_cookie
642 Elf_Internal_Rela *rels, *rel, *relend;
643 Elf_Internal_Sym *locsyms;
647 struct elf_link_hash_entry **sym_hashes;
649 bfd_boolean bad_symtab;
652 /* The level of IRIX compatibility we're striving for. */
660 /* Mapping of ELF section names and types. */
661 struct bfd_elf_special_section
665 /* 0 means name must match PREFIX exactly.
666 -1 means name must start with PREFIX followed by an arbitrary string.
667 -2 means name must match PREFIX exactly or consist of PREFIX followed
668 by a dot then anything.
669 > 0 means name must start with the first PREFIX_LENGTH chars of
670 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
676 enum action_discarded
682 typedef asection * (*elf_gc_mark_hook_fn)
683 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
684 struct elf_link_hash_entry *, Elf_Internal_Sym *);
686 struct elf_backend_data
688 /* The architecture for this backend. */
689 enum bfd_architecture arch;
691 /* An identifier used to distinguish different target specific
692 extensions to elf_obj_tdata and elf_link_hash_table structures. */
693 enum elf_target_id target_id;
695 /* The ELF machine code (EM_xxxx) for this backend. */
696 int elf_machine_code;
701 /* The maximum page size for this backend. */
704 /* The minimum page size for this backend. An input object will not be
705 considered page aligned unless its sections are correctly aligned for
706 pages at least this large. May be smaller than maxpagesize. */
709 /* The common page size for this backend. */
710 bfd_vma commonpagesize;
712 /* The BFD flags applied to sections created for dynamic linking. */
713 flagword dynamic_sec_flags;
715 /* A function to translate an ELF RELA relocation to a BFD arelent
717 void (*elf_info_to_howto)
718 (bfd *, arelent *, Elf_Internal_Rela *);
720 /* A function to translate an ELF REL relocation to a BFD arelent
722 void (*elf_info_to_howto_rel)
723 (bfd *, arelent *, Elf_Internal_Rela *);
725 /* A function to determine whether a symbol is global when
726 partitioning the symbol table into local and global symbols.
727 This should be NULL for most targets, in which case the correct
728 thing will be done. MIPS ELF, at least on the Irix 5, has
729 special requirements. */
730 bfd_boolean (*elf_backend_sym_is_global)
733 /* The remaining functions are hooks which are called only if they
736 /* A function to permit a backend specific check on whether a
737 particular BFD format is relevant for an object file, and to
738 permit the backend to set any global information it wishes. When
739 this is called elf_elfheader is set, but anything else should be
740 used with caution. If this returns FALSE, the check_format
741 routine will return a bfd_error_wrong_format error. */
742 bfd_boolean (*elf_backend_object_p)
745 /* A function to do additional symbol processing when reading the
746 ELF symbol table. This is where any processor-specific special
747 section indices are handled. */
748 void (*elf_backend_symbol_processing)
751 /* A function to do additional symbol processing after reading the
752 entire ELF symbol table. */
753 bfd_boolean (*elf_backend_symbol_table_processing)
754 (bfd *, elf_symbol_type *, unsigned int);
756 /* A function to set the type of the info field. Processor-specific
757 types should be handled here. */
758 int (*elf_backend_get_symbol_type)
759 (Elf_Internal_Sym *, int);
761 /* A function to return the linker hash table entry of a symbol that
762 might be satisfied by an archive symbol. */
763 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
764 (bfd *, struct bfd_link_info *, const char *);
766 /* Return true if local section symbols should have a non-null st_name.
767 NULL implies false. */
768 bfd_boolean (*elf_backend_name_local_section_symbols)
771 /* A function to do additional processing on the ELF section header
772 just before writing it out. This is used to set the flags and
773 type fields for some sections, or to actually write out data for
775 bfd_boolean (*elf_backend_section_processing)
776 (bfd *, Elf_Internal_Shdr *);
778 /* A function to handle unusual section types when creating BFD
779 sections from ELF sections. */
780 bfd_boolean (*elf_backend_section_from_shdr)
781 (bfd *, Elf_Internal_Shdr *, const char *, int);
783 /* A function to convert machine dependent ELF section header flags to
784 BFD internal section header flags. */
785 bfd_boolean (*elf_backend_section_flags)
786 (flagword *, const Elf_Internal_Shdr *);
788 /* A function that returns a struct containing ELF section flags and
789 type for the given BFD section. */
790 const struct bfd_elf_special_section * (*get_sec_type_attr)
793 /* A function to handle unusual program segment types when creating BFD
794 sections from ELF program segments. */
795 bfd_boolean (*elf_backend_section_from_phdr)
796 (bfd *, Elf_Internal_Phdr *, int, const char *);
798 /* A function to set up the ELF section header for a BFD section in
799 preparation for writing it out. This is where the flags and type
800 fields are set for unusual sections. */
801 bfd_boolean (*elf_backend_fake_sections)
802 (bfd *, Elf_Internal_Shdr *, asection *);
804 /* A function to get the ELF section index for a BFD section. If
805 this returns TRUE, the section was found. If it is a normal ELF
806 section, *RETVAL should be left unchanged. If it is not a normal
807 ELF section *RETVAL should be set to the SHN_xxxx index. */
808 bfd_boolean (*elf_backend_section_from_bfd_section)
809 (bfd *, asection *, int *retval);
811 /* If this field is not NULL, it is called by the add_symbols phase
812 of a link just before adding a symbol to the global linker hash
813 table. It may modify any of the fields as it wishes. If *NAME
814 is set to NULL, the symbol will be skipped rather than being
815 added to the hash table. This function is responsible for
816 handling all processor dependent symbol bindings and section
817 indices, and must set at least *FLAGS and *SEC for each processor
818 dependent case; failure to do so will cause a link error. */
819 bfd_boolean (*elf_add_symbol_hook)
820 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
821 const char **name, flagword *flags, asection **sec, bfd_vma *value);
823 /* If this field is not NULL, it is called by the elf_link_output_sym
824 phase of a link for each symbol which will appear in the object file.
825 On error, this function returns 0. 1 is returned when the symbol
826 should be output, 2 is returned when the symbol should be discarded. */
827 int (*elf_backend_link_output_symbol_hook)
828 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
829 asection *, struct elf_link_hash_entry *);
831 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
832 linker the first time it encounters a dynamic object in the link.
833 This function must create any sections required for dynamic
834 linking. The ABFD argument is a dynamic object. The .interp,
835 .dynamic, .dynsym, .dynstr, and .hash functions have already been
836 created, and this function may modify the section flags if
837 desired. This function will normally create the .got and .plt
838 sections, but different backends have different requirements. */
839 bfd_boolean (*elf_backend_create_dynamic_sections)
840 (bfd *abfd, struct bfd_link_info *info);
842 /* When creating a shared library, determine whether to omit the
843 dynamic symbol for the section. */
844 bfd_boolean (*elf_backend_omit_section_dynsym)
845 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
847 /* Return TRUE if relocations of targets are compatible to the extent
848 that CHECK_RELOCS will properly process them. PR 4424. */
849 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
851 /* The CHECK_RELOCS function is called by the add_symbols phase of
852 the ELF backend linker. It is called once for each section with
853 relocs of an object file, just after the symbols for the object
854 file have been added to the global linker hash table. The
855 function must look through the relocs and do any special handling
856 required. This generally means allocating space in the global
857 offset table, and perhaps allocating space for a reloc. The
858 relocs are always passed as Rela structures; if the section
859 actually uses Rel structures, the r_addend field will always be
861 bfd_boolean (*check_relocs)
862 (bfd *abfd, struct bfd_link_info *info, asection *o,
863 const Elf_Internal_Rela *relocs);
865 /* The CHECK_DIRECTIVES function is called once per input file by
866 the add_symbols phase of the ELF backend linker. The function
867 must inspect the bfd and create any additional symbols according
868 to any custom directives in the bfd. */
869 bfd_boolean (*check_directives)
870 (bfd *abfd, struct bfd_link_info *info);
872 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
873 input file that was not needed by the add_symbols phase of the
874 ELF backend linker. The function must undo any target specific
875 changes in the symbol hash table. */
876 bfd_boolean (*as_needed_cleanup)
877 (bfd *abfd, struct bfd_link_info *info);
879 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
880 linker for every symbol which is defined by a dynamic object and
881 referenced by a regular object. This is called after all the
882 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
883 function has been called. The hash table entry should be
884 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
885 defined in a section from a dynamic object. Dynamic object
886 sections are not included in the final link, and this function is
887 responsible for changing the value to something which the rest of
888 the link can deal with. This will normally involve adding an
889 entry to the .plt or .got or some such section, and setting the
890 symbol to point to that. */
891 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
892 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
894 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
895 after all the linker input files have been seen but before the
896 section sizes have been set. This is called after
897 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
898 bfd_boolean (*elf_backend_always_size_sections)
899 (bfd *output_bfd, struct bfd_link_info *info);
901 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
902 linker after all the linker input files have been seen but before
903 the sections sizes have been set. This is called after
904 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
905 It is only called when linking against a dynamic object. It must
906 set the sizes of the dynamic sections, and may fill in their
907 contents as well. The generic ELF linker can handle the .dynsym,
908 .dynstr and .hash sections. This function must handle the
909 .interp section and any sections created by the
910 CREATE_DYNAMIC_SECTIONS entry point. */
911 bfd_boolean (*elf_backend_size_dynamic_sections)
912 (bfd *output_bfd, struct bfd_link_info *info);
914 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
915 we keep to use as a base for relocs and symbols. */
916 void (*elf_backend_init_index_section)
917 (bfd *output_bfd, struct bfd_link_info *info);
919 /* The RELOCATE_SECTION function is called by the ELF backend linker
920 to handle the relocations for a section.
922 The relocs are always passed as Rela structures; if the section
923 actually uses Rel structures, the r_addend field will always be
926 This function is responsible for adjust the section contents as
927 necessary, and (if using Rela relocs and generating a
928 relocatable output file) adjusting the reloc addend as
931 This function does not have to worry about setting the reloc
932 address or the reloc symbol index.
934 LOCAL_SYMS is a pointer to the swapped in local symbols.
936 LOCAL_SECTIONS is an array giving the section in the input file
937 corresponding to the st_shndx field of each local symbol.
939 The global hash table entry for the global symbols can be found
940 via elf_sym_hashes (input_bfd).
942 When generating relocatable output, this function must handle
943 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
944 going to be the section symbol corresponding to the output
945 section, which means that the addend must be adjusted
948 Returns FALSE on error, TRUE on success, 2 if successful and
949 relocations should be written for this section. */
950 int (*elf_backend_relocate_section)
951 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
952 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
953 Elf_Internal_Sym *local_syms, asection **local_sections);
955 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
956 linker just before it writes a symbol out to the .dynsym section.
957 The processor backend may make any required adjustment to the
958 symbol. It may also take the opportunity to set contents of the
959 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
960 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
961 on those symbols which are defined by a dynamic object. */
962 bfd_boolean (*elf_backend_finish_dynamic_symbol)
963 (bfd *output_bfd, struct bfd_link_info *info,
964 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
966 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
967 linker just before it writes all the dynamic sections out to the
968 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
969 all dynamic symbols. */
970 bfd_boolean (*elf_backend_finish_dynamic_sections)
971 (bfd *output_bfd, struct bfd_link_info *info);
973 /* A function to do any beginning processing needed for the ELF file
974 before building the ELF headers and computing file positions. */
975 void (*elf_backend_begin_write_processing)
976 (bfd *, struct bfd_link_info *);
978 /* A function to do any final processing needed for the ELF file
979 before writing it out. The LINKER argument is TRUE if this BFD
980 was created by the ELF backend linker. */
981 void (*elf_backend_final_write_processing)
982 (bfd *, bfd_boolean linker);
984 /* This function is called by get_program_header_size. It should
985 return the number of additional program segments which this BFD
986 will need. It should return -1 on error. */
987 int (*elf_backend_additional_program_headers)
988 (bfd *, struct bfd_link_info *);
990 /* This function is called to modify an existing segment map in a
991 backend specific fashion. */
992 bfd_boolean (*elf_backend_modify_segment_map)
993 (bfd *, struct bfd_link_info *);
995 /* This function is called to modify program headers just before
997 bfd_boolean (*elf_backend_modify_program_headers)
998 (bfd *, struct bfd_link_info *);
1000 /* This function is called before section garbage collection to
1001 mark entry symbol sections. */
1003 (struct bfd_link_info *);
1005 /* This function is called during section garbage collection to
1006 mark sections that define global symbols. */
1007 bfd_boolean (*gc_mark_dynamic_ref)
1008 (struct elf_link_hash_entry *, void *);
1010 /* This function is called during section gc to discover the section a
1011 particular relocation refers to. */
1012 elf_gc_mark_hook_fn gc_mark_hook;
1014 /* This function, if defined, is called after the first gc marking pass
1015 to allow the backend to mark additional sections. */
1016 bfd_boolean (*gc_mark_extra_sections)
1017 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1019 /* This function, if defined, is called during the sweep phase of gc
1020 in order that a backend might update any data structures it might
1022 bfd_boolean (*gc_sweep_hook)
1023 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1025 /* This function, if defined, is called after the ELF headers have
1026 been created. This allows for things like the OS and ABI versions
1028 void (*elf_backend_post_process_headers)
1029 (bfd *, struct bfd_link_info *);
1031 /* This function, if defined, prints a symbol to file and returns the
1032 name of the symbol to be printed. It should return NULL to fall
1033 back to default symbol printing. */
1034 const char *(*elf_backend_print_symbol_all)
1035 (bfd *, void *, asymbol *);
1037 /* This function, if defined, is called after all local symbols and
1038 global symbols converted to locals are emitted into the symtab
1039 section. It allows the backend to emit special local symbols
1040 not handled in the hash table. */
1041 bfd_boolean (*elf_backend_output_arch_local_syms)
1042 (bfd *, struct bfd_link_info *, void *,
1043 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1044 struct elf_link_hash_entry *));
1046 /* This function, if defined, is called after all symbols are emitted
1047 into the symtab section. It allows the backend to emit special
1048 global symbols not handled in the hash table. */
1049 bfd_boolean (*elf_backend_output_arch_syms)
1050 (bfd *, struct bfd_link_info *, void *,
1051 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1052 struct elf_link_hash_entry *));
1054 /* Copy any information related to dynamic linking from a pre-existing
1055 symbol to a newly created symbol. Also called to copy flags and
1056 other back-end info to a weakdef, in which case the symbol is not
1057 newly created and plt/got refcounts and dynamic indices should not
1059 void (*elf_backend_copy_indirect_symbol)
1060 (struct bfd_link_info *, struct elf_link_hash_entry *,
1061 struct elf_link_hash_entry *);
1063 /* Modify any information related to dynamic linking such that the
1064 symbol is not exported. */
1065 void (*elf_backend_hide_symbol)
1066 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1068 /* A function to do additional symbol fixup, called by
1069 _bfd_elf_fix_symbol_flags. */
1070 bfd_boolean (*elf_backend_fixup_symbol)
1071 (struct bfd_link_info *, struct elf_link_hash_entry *);
1073 /* Merge the backend specific symbol attribute. */
1074 void (*elf_backend_merge_symbol_attribute)
1075 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1078 /* This function, if defined, will return a string containing the
1079 name of a target-specific dynamic tag. */
1080 char *(*elf_backend_get_target_dtag)
1083 /* Decide whether an undefined symbol is special and can be ignored.
1084 This is the case for OPTIONAL symbols on IRIX. */
1085 bfd_boolean (*elf_backend_ignore_undef_symbol)
1086 (struct elf_link_hash_entry *);
1088 /* Emit relocations. Overrides default routine for emitting relocs,
1089 except during a relocatable link, or if all relocs are being emitted. */
1090 bfd_boolean (*elf_backend_emit_relocs)
1091 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1092 struct elf_link_hash_entry **);
1094 /* Count relocations. Not called for relocatable links
1095 or if all relocs are being preserved in the output. */
1096 unsigned int (*elf_backend_count_relocs)
1097 (struct bfd_link_info *, asection *);
1099 /* This function, if defined, is called when an NT_PRSTATUS note is found
1101 bfd_boolean (*elf_backend_grok_prstatus)
1102 (bfd *, Elf_Internal_Note *);
1104 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1105 note is found in a core file. */
1106 bfd_boolean (*elf_backend_grok_psinfo)
1107 (bfd *, Elf_Internal_Note *);
1109 /* This function, if defined, is called to write a note to a corefile. */
1110 char *(*elf_backend_write_core_note)
1111 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1113 /* This function returns class of a reloc type. */
1114 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1115 (const Elf_Internal_Rela *);
1117 /* This function, if defined, removes information about discarded functions
1118 from other sections which mention them. */
1119 bfd_boolean (*elf_backend_discard_info)
1120 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1122 /* This function, if defined, signals that the function above has removed
1123 the discarded relocations for this section. */
1124 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1127 /* What to do when ld finds relocations against symbols defined in
1128 discarded sections. */
1129 unsigned int (*action_discarded)
1132 /* This function returns the width of FDE pointers in bytes, or 0 if
1133 that can't be determined for some reason. The default definition
1134 goes by the bfd's EI_CLASS. */
1135 unsigned int (*elf_backend_eh_frame_address_size)
1136 (bfd *, asection *);
1138 /* These functions tell elf-eh-frame whether to attempt to turn
1139 absolute or lsda encodings into pc-relative ones. The default
1140 definition enables these transformations. */
1141 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1142 (bfd *, struct bfd_link_info *, asection *);
1143 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1144 (bfd *, struct bfd_link_info *, asection *);
1146 /* This function returns an encoding after computing the encoded
1147 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1148 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1149 The default definition chooses a 32-bit PC-relative encoding. */
1150 bfd_byte (*elf_backend_encode_eh_address)
1151 (bfd *abfd, struct bfd_link_info *info,
1152 asection *osec, bfd_vma offset,
1153 asection *loc_sec, bfd_vma loc_offset,
1156 /* This function, if defined, may write out the given section.
1157 Returns TRUE if it did so and FALSE if the caller should. */
1158 bfd_boolean (*elf_backend_write_section)
1159 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1161 /* The level of IRIX compatibility we're striving for.
1162 MIPS ELF specific function. */
1163 irix_compat_t (*elf_backend_mips_irix_compat)
1166 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1167 (unsigned int, bfd_boolean);
1169 /* The swapping table to use when dealing with ECOFF information.
1170 Used for the MIPS ELF .mdebug section. */
1171 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1173 /* This function implements `bfd_elf_bfd_from_remote_memory';
1174 see elf.c, elfcode.h. */
1175 bfd *(*elf_backend_bfd_from_remote_memory)
1176 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1177 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1179 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1181 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1183 /* Is symbol defined in common section? */
1184 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1186 /* Return a common section index for section. */
1187 unsigned int (*common_section_index) (asection *);
1189 /* Return a common section for section. */
1190 asection *(*common_section) (asection *);
1192 /* Return TRUE if we can merge 2 definitions. */
1193 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1194 struct elf_link_hash_entry **,
1195 struct elf_link_hash_entry *,
1196 Elf_Internal_Sym *, asection **,
1197 bfd_vma *, unsigned int *,
1198 bfd_boolean *, bfd_boolean *,
1199 bfd_boolean *, bfd_boolean *,
1200 bfd_boolean *, bfd_boolean *,
1201 bfd_boolean *, bfd_boolean *,
1203 bfd_boolean *, bfd_boolean *,
1204 bfd_boolean *, bfd_boolean *,
1205 bfd *, asection **);
1207 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1208 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1210 /* Return TRUE if type is a function symbol type. */
1211 bfd_boolean (*is_function_type) (unsigned int type);
1213 /* Used to handle bad SHF_LINK_ORDER input. */
1214 bfd_error_handler_type link_order_error_handler;
1216 /* Name of the PLT relocation section. */
1217 const char *relplt_name;
1219 /* Alternate EM_xxxx machine codes for this backend. */
1220 int elf_machine_alt1;
1221 int elf_machine_alt2;
1223 const struct elf_size_info *s;
1225 /* An array of target specific special sections. */
1226 const struct bfd_elf_special_section *special_sections;
1228 /* The size in bytes of the header for the GOT. This includes the
1229 so-called reserved entries on some systems. */
1230 bfd_vma got_header_size;
1232 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1233 otherwise by the local symbol with index SYMNDX in IBFD. */
1234 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1235 struct elf_link_hash_entry *h,
1236 bfd *ibfd, unsigned long symndx);
1238 /* The vendor name to use for a processor-standard attributes section. */
1239 const char *obj_attrs_vendor;
1241 /* The section name to use for a processor-standard attributes section. */
1242 const char *obj_attrs_section;
1244 /* Return 1, 2 or 3 to indicate what type of arguments a
1245 processor-specific tag takes. */
1246 int (*obj_attrs_arg_type) (int);
1248 /* The section type to use for an attributes section. */
1249 unsigned int obj_attrs_section_type;
1251 /* This function determines the order in which any attributes are
1252 written. It must be defined for input in the range
1253 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1254 is used in order to make unity easy). The returned value is the
1255 actual tag number to place in the input position. */
1256 int (*obj_attrs_order) (int);
1258 /* Handle merging unknown attributes; either warn and return TRUE,
1259 or give an error and return FALSE. */
1260 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1262 /* This is non-zero if static TLS segments require a special alignment. */
1263 unsigned static_tls_alignment;
1265 /* This is TRUE if the linker should act like collect and gather
1266 global constructors and destructors by name. This is TRUE for
1267 MIPS ELF because the Irix 5 tools can not handle the .init
1269 unsigned collect : 1;
1271 /* This is TRUE if the linker should ignore changes to the type of a
1272 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1273 record undefined functions as STT_OBJECT although the definitions
1275 unsigned type_change_ok : 1;
1277 /* Whether the backend may use REL relocations. (Some backends use
1278 both REL and RELA relocations, and this flag is set for those
1280 unsigned may_use_rel_p : 1;
1282 /* Whether the backend may use RELA relocations. (Some backends use
1283 both REL and RELA relocations, and this flag is set for those
1285 unsigned may_use_rela_p : 1;
1287 /* Whether the default relocation type is RELA. If a backend with
1288 this flag set wants REL relocations for a particular section,
1289 it must note that explicitly. Similarly, if this flag is clear,
1290 and the backend wants RELA relocations for a particular
1292 unsigned default_use_rela_p : 1;
1294 /* True if PLT and copy relocations should be RELA by default. */
1295 unsigned rela_plts_and_copies_p : 1;
1297 /* Set if RELA relocations for a relocatable link can be handled by
1298 generic code. Backends that set this flag need do nothing in the
1299 backend relocate_section routine for relocatable linking. */
1300 unsigned rela_normal : 1;
1302 /* TRUE if addresses "naturally" sign extend. This is used when
1303 swapping in from Elf32 when BFD64. */
1304 unsigned sign_extend_vma : 1;
1306 unsigned want_got_plt : 1;
1307 unsigned plt_readonly : 1;
1308 unsigned want_plt_sym : 1;
1309 unsigned plt_not_loaded : 1;
1310 unsigned plt_alignment : 4;
1311 unsigned can_gc_sections : 1;
1312 unsigned can_refcount : 1;
1313 unsigned want_got_sym : 1;
1314 unsigned want_dynbss : 1;
1316 /* Targets which do not support physical addressing often require
1317 that the p_paddr field in the section header to be set to zero.
1318 This field indicates whether this behavior is required. */
1319 unsigned want_p_paddr_set_to_zero : 1;
1321 /* True if an object file lacking a .note.GNU-stack section
1322 should be assumed to be requesting exec stack. At least one
1323 other file in the link needs to have a .note.GNU-stack section
1324 for a PT_GNU_STACK segment to be created. */
1325 unsigned default_execstack : 1;
1328 /* Information about reloc sections associated with a bfd_elf_section_data
1330 struct bfd_elf_section_reloc_data
1332 /* The ELF header for the reloc section associated with this
1334 Elf_Internal_Shdr *hdr;
1335 /* The number of relocations currently assigned to HDR. */
1337 /* The ELF section number of the reloc section. Only used for an
1340 /* Used by the backend linker to store the symbol hash table entries
1341 associated with relocs against global symbols. */
1342 struct elf_link_hash_entry **hashes;
1345 /* Information stored for each BFD section in an ELF file. This
1346 structure is allocated by elf_new_section_hook. */
1348 struct bfd_elf_section_data
1350 /* The ELF header for this section. */
1351 Elf_Internal_Shdr this_hdr;
1353 /* Information about the REL and RELA reloc sections associated
1354 with this section, if any. */
1355 struct bfd_elf_section_reloc_data rel, rela;
1357 /* The ELF section number of this section. */
1360 /* Used by the backend linker when generating a shared library to
1361 record the dynamic symbol index for a section symbol
1362 corresponding to this section. A value of 0 means that there is
1363 no dynamic symbol for this section. */
1366 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1367 asection *linked_to;
1369 /* A pointer to the swapped relocs. If the section uses REL relocs,
1370 rather than RELA, all the r_addend fields will be zero. This
1371 pointer may be NULL. It is used by the backend linker. */
1372 Elf_Internal_Rela *relocs;
1374 /* A pointer to a linked list tracking dynamic relocs copied for
1378 /* A pointer to the bfd section used for dynamic relocs. */
1382 /* Group name, if this section is a member of a group. */
1385 /* Group signature sym, if this is the SHT_GROUP section. */
1386 struct bfd_symbol *id;
1389 /* For a member of a group, points to the SHT_GROUP section.
1390 NULL for the SHT_GROUP section itself and non-group sections. */
1391 asection *sec_group;
1393 /* A linked list of member sections in the group. Circular when used by
1394 the linker. For the SHT_GROUP section, points at first member. */
1395 asection *next_in_group;
1397 /* The FDEs associated with this section. The u.fde.next_in_section
1398 field acts as a chain pointer. */
1399 struct eh_cie_fde *fde_list;
1401 /* A pointer used for various section optimizations. */
1405 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1406 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1407 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1408 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1409 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1410 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1411 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1412 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1413 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1415 #define xvec_get_elf_backend_data(xvec) \
1416 ((const struct elf_backend_data *) (xvec)->backend_data)
1418 #define get_elf_backend_data(abfd) \
1419 xvec_get_elf_backend_data ((abfd)->xvec)
1421 /* The least object attributes (within an attributes subsection) known
1422 for any target. Some code assumes that the value 0 is not used and
1423 the field for that attribute can instead be used as a marker to
1424 indicate that attributes have been initialized. */
1425 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1427 /* The maximum number of known object attributes for any target. */
1428 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1430 /* The value of an object attribute. The type indicates whether the attribute
1431 holds and integer, a string, or both. It can also indicate that there can
1432 be no default (i.e. all values must be written to file, even zero). */
1434 typedef struct obj_attribute
1436 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1437 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1438 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1440 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1441 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1442 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1449 typedef struct obj_attribute_list
1451 struct obj_attribute_list *next;
1454 } obj_attribute_list;
1456 /* Object attributes may either be defined by the processor ABI, index
1457 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1458 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1459 #define OBJ_ATTR_PROC 0
1460 #define OBJ_ATTR_GNU 1
1461 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1462 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1464 /* The following object attribute tags are taken as generic, for all
1465 targets and for "gnu" where there is no target standard. */
1472 Tag_compatibility = 32
1475 /* The following struct stores information about every SystemTap section
1476 found in the object file. */
1479 struct sdt_note *next;
1484 /* Some private data is stashed away for future use using the tdata pointer
1485 in the bfd structure. */
1487 struct elf_obj_tdata
1489 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1490 Elf_Internal_Shdr **elf_sect_ptr;
1491 Elf_Internal_Phdr *phdr;
1492 struct elf_segment_map *segment_map;
1493 struct elf_strtab_hash *strtab_ptr;
1496 unsigned int num_elf_sections; /* elf_sect_ptr size */
1497 int num_section_syms;
1498 asymbol **section_syms; /* STT_SECTION symbols for each section */
1499 Elf_Internal_Shdr symtab_hdr;
1500 Elf_Internal_Shdr shstrtab_hdr;
1501 Elf_Internal_Shdr strtab_hdr;
1502 Elf_Internal_Shdr dynsymtab_hdr;
1503 Elf_Internal_Shdr dynstrtab_hdr;
1504 Elf_Internal_Shdr dynversym_hdr;
1505 Elf_Internal_Shdr dynverref_hdr;
1506 Elf_Internal_Shdr dynverdef_hdr;
1507 Elf_Internal_Shdr symtab_shndx_hdr;
1508 unsigned int symtab_section, shstrtab_section;
1509 unsigned int strtab_section, dynsymtab_section;
1510 unsigned int symtab_shndx_section;
1511 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1512 file_ptr next_file_pos;
1513 bfd_vma gp; /* The gp value */
1514 unsigned int gp_size; /* The gp size */
1516 /* Information grabbed from an elf core file. */
1523 /* A mapping from external symbols to entries in the linker hash
1524 table, used when linking. This is indexed by the symbol index
1525 minus the sh_info field of the symbol table header. */
1526 struct elf_link_hash_entry **sym_hashes;
1528 /* Track usage and final offsets of GOT entries for local symbols.
1529 This array is indexed by symbol index. Elements are used
1530 identically to "got" in struct elf_link_hash_entry. */
1533 bfd_signed_vma *refcounts;
1535 struct got_entry **ents;
1538 /* The linker ELF emulation code needs to let the backend ELF linker
1539 know what filename should be used for a dynamic object if the
1540 dynamic object is found using a search. The emulation code then
1541 sometimes needs to know what name was actually used. Until the
1542 file has been added to the linker symbol table, this field holds
1543 the name the linker wants. After it has been added, it holds the
1544 name actually used, which will be the DT_SONAME entry if there is
1546 const char *dt_name;
1548 /* The linker emulation needs to know what audit libs
1549 are used by a dynamic object. */
1550 const char *dt_audit;
1552 /* Records the result of `get_program_header_size'. */
1553 bfd_size_type program_header_size;
1555 /* Used by find_nearest_line entry point. */
1558 /* Used by MIPS ELF find_nearest_line entry point. The structure
1559 could be included directly in this one, but there's no point to
1560 wasting the memory just for the infrequently called
1561 find_nearest_line. */
1562 struct mips_elf_find_line *find_line_info;
1564 /* A place to stash dwarf1 info for this bfd. */
1565 struct dwarf1_debug *dwarf1_find_line_info;
1567 /* A place to stash dwarf2 info for this bfd. */
1568 void *dwarf2_find_line_info;
1570 /* An array of stub sections indexed by symbol number, used by the
1571 MIPS ELF linker. FIXME: We should figure out some way to only
1572 include this field for a MIPS ELF target. */
1573 asection **local_stubs;
1574 asection **local_call_stubs;
1576 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1578 asection *eh_frame_hdr;
1580 Elf_Internal_Shdr **group_sect_ptr;
1583 /* Number of symbol version definitions we are about to emit. */
1584 unsigned int cverdefs;
1586 /* Number of symbol version references we are about to emit. */
1587 unsigned int cverrefs;
1589 /* Segment flags for the PT_GNU_STACK segment. */
1590 unsigned int stack_flags;
1592 /* Symbol version definitions in external objects. */
1593 Elf_Internal_Verdef *verdef;
1595 /* Symbol version references to external objects. */
1596 Elf_Internal_Verneed *verref;
1598 /* The Irix 5 support uses two virtual sections, which represent
1599 text/data symbols defined in dynamic objects. */
1600 asymbol *elf_data_symbol;
1601 asymbol *elf_text_symbol;
1602 asection *elf_data_section;
1603 asection *elf_text_section;
1605 /* A pointer to the .eh_frame section. */
1606 asection *eh_frame_section;
1608 /* Whether a dyanmic object was specified normally on the linker
1609 command line, or was specified when --as-needed was in effect,
1610 or was found via a DT_NEEDED entry. */
1611 enum dynamic_lib_link_class dyn_lib_class;
1613 /* This is set to TRUE if the object was created by the backend
1617 /* Irix 5 often screws up the symbol table, sorting local symbols
1618 after global symbols. This flag is set if the symbol table in
1619 this BFD appears to be screwed up. If it is, we ignore the
1620 sh_info field in the symbol table header, and always read all the
1622 bfd_boolean bad_symtab;
1624 /* Used to determine if the e_flags field has been initialized */
1625 bfd_boolean flags_init;
1627 /* Symbol buffer. */
1630 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1631 obj_attribute_list *other_obj_attributes[2];
1633 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1634 bfd_boolean (*after_write_object_contents) (bfd *);
1635 void *after_write_object_contents_info;
1637 /* NT_GNU_BUILD_ID note type. */
1638 bfd_size_type build_id_size;
1641 /* Linked-list containing information about every Systemtap section
1642 found in the object file. Each section corresponds to one entry
1644 struct sdt_note *sdt_note_head;
1646 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1647 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1648 field in the ELF header structure. */
1649 bfd_boolean has_gnu_symbols;
1651 /* An identifier used to distinguish different target
1652 specific extensions to this structure. */
1653 enum elf_target_id object_id;
1656 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1658 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1659 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1660 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1661 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1662 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1663 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1664 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1665 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1666 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1667 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1668 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1669 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1670 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1671 #define elf_eh_frame_section(bfd) \
1672 (elf_tdata(bfd) -> eh_frame_section)
1673 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1674 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1675 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1676 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1677 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1678 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1679 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1680 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1681 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1682 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1683 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1684 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1685 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1686 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1687 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1688 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1689 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1690 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1691 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1692 #define elf_known_obj_attributes_proc(bfd) \
1693 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1694 #define elf_other_obj_attributes_proc(bfd) \
1695 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1697 extern void _bfd_elf_swap_verdef_in
1698 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1699 extern void _bfd_elf_swap_verdef_out
1700 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1701 extern void _bfd_elf_swap_verdaux_in
1702 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1703 extern void _bfd_elf_swap_verdaux_out
1704 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1705 extern void _bfd_elf_swap_verneed_in
1706 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1707 extern void _bfd_elf_swap_verneed_out
1708 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1709 extern void _bfd_elf_swap_vernaux_in
1710 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1711 extern void _bfd_elf_swap_vernaux_out
1712 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1713 extern void _bfd_elf_swap_versym_in
1714 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1715 extern void _bfd_elf_swap_versym_out
1716 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1718 extern unsigned int _bfd_elf_section_from_bfd_section
1719 (bfd *, asection *);
1720 extern char *bfd_elf_string_from_elf_section
1721 (bfd *, unsigned, unsigned);
1722 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1723 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1724 Elf_External_Sym_Shndx *);
1725 extern const char *bfd_elf_sym_name
1726 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1728 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1730 extern bfd_boolean _bfd_elf_print_private_bfd_data
1732 extern void bfd_elf_print_symbol
1733 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1735 extern unsigned int _bfd_elf_eh_frame_address_size
1736 (bfd *, asection *);
1737 extern bfd_byte _bfd_elf_encode_eh_address
1738 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1739 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1740 extern bfd_boolean _bfd_elf_can_make_relative
1741 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1743 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1744 (const Elf_Internal_Rela *);
1745 extern bfd_vma _bfd_elf_rela_local_sym
1746 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1747 extern bfd_vma _bfd_elf_rel_local_sym
1748 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1749 extern bfd_vma _bfd_elf_section_offset
1750 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1752 extern unsigned long bfd_elf_hash
1754 extern unsigned long bfd_elf_gnu_hash
1757 extern bfd_reloc_status_type bfd_elf_generic_reloc
1758 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1759 extern bfd_boolean bfd_elf_allocate_object
1760 (bfd *, size_t, enum elf_target_id);
1761 extern bfd_boolean bfd_elf_make_object
1763 extern bfd_boolean bfd_elf_mkcorefile
1765 extern bfd_boolean _bfd_elf_make_section_from_shdr
1766 (bfd *, Elf_Internal_Shdr *, const char *, int);
1767 extern bfd_boolean _bfd_elf_make_section_from_phdr
1768 (bfd *, Elf_Internal_Phdr *, int, const char *);
1769 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1770 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1771 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1773 extern void _bfd_elf_link_hash_copy_indirect
1774 (struct bfd_link_info *, struct elf_link_hash_entry *,
1775 struct elf_link_hash_entry *);
1776 extern void _bfd_elf_link_hash_hide_symbol
1777 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1778 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1779 (struct bfd_link_info *, struct elf_link_hash_entry *);
1780 extern bfd_boolean _bfd_elf_link_hash_table_init
1781 (struct elf_link_hash_table *, bfd *,
1782 struct bfd_hash_entry *(*)
1783 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1784 unsigned int, enum elf_target_id);
1785 extern bfd_boolean _bfd_elf_slurp_version_tables
1786 (bfd *, bfd_boolean);
1787 extern bfd_boolean _bfd_elf_merge_sections
1788 (bfd *, struct bfd_link_info *);
1789 extern bfd_boolean _bfd_elf_match_sections_by_type
1790 (bfd *, const asection *, bfd *, const asection *);
1791 extern bfd_boolean bfd_elf_is_group_section
1792 (bfd *, const struct bfd_section *);
1793 extern void _bfd_elf_section_already_linked
1794 (bfd *, struct bfd_section *, struct bfd_link_info *);
1795 extern void bfd_elf_set_group_contents
1796 (bfd *, asection *, void *);
1797 extern asection *_bfd_elf_check_kept_section
1798 (asection *, struct bfd_link_info *);
1799 extern void _bfd_elf_link_just_syms
1800 (asection *, struct bfd_link_info *);
1801 extern void _bfd_elf_copy_link_hash_symbol_type
1802 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1803 extern bfd_boolean _bfd_elf_size_group_sections
1804 (struct bfd_link_info *);
1805 extern bfd_boolean _bfd_elf_fixup_group_sections
1806 (bfd *, asection *);
1807 extern bfd_boolean _bfd_elf_copy_private_header_data
1809 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1810 (bfd *, asymbol *, bfd *, asymbol *);
1811 #define _bfd_generic_init_private_section_data \
1812 _bfd_elf_init_private_section_data
1813 extern bfd_boolean _bfd_elf_init_private_section_data
1814 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1815 extern bfd_boolean _bfd_elf_copy_private_section_data
1816 (bfd *, asection *, bfd *, asection *);
1817 extern bfd_boolean _bfd_elf_write_object_contents
1819 extern bfd_boolean _bfd_elf_write_corefile_contents
1821 extern bfd_boolean _bfd_elf_set_section_contents
1822 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1823 extern long _bfd_elf_get_symtab_upper_bound
1825 extern long _bfd_elf_canonicalize_symtab
1826 (bfd *, asymbol **);
1827 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1829 extern long _bfd_elf_canonicalize_dynamic_symtab
1830 (bfd *, asymbol **);
1831 extern long _bfd_elf_get_synthetic_symtab
1832 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1833 extern long _bfd_elf_get_reloc_upper_bound
1835 extern long _bfd_elf_canonicalize_reloc
1836 (bfd *, sec_ptr, arelent **, asymbol **);
1837 extern asection * _bfd_elf_get_dynamic_reloc_section
1838 (bfd *, asection *, bfd_boolean);
1839 extern asection * _bfd_elf_make_dynamic_reloc_section
1840 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1841 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1843 extern long _bfd_elf_canonicalize_dynamic_reloc
1844 (bfd *, arelent **, asymbol **);
1845 extern asymbol *_bfd_elf_make_empty_symbol
1847 extern void _bfd_elf_get_symbol_info
1848 (bfd *, asymbol *, symbol_info *);
1849 extern bfd_boolean _bfd_elf_is_local_label_name
1850 (bfd *, const char *);
1851 extern alent *_bfd_elf_get_lineno
1853 extern bfd_boolean _bfd_elf_set_arch_mach
1854 (bfd *, enum bfd_architecture, unsigned long);
1855 extern bfd_boolean _bfd_elf_find_nearest_line
1856 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1858 extern bfd_boolean _bfd_elf_find_line
1859 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1860 #define _bfd_generic_find_line _bfd_elf_find_line
1861 extern bfd_boolean _bfd_elf_find_inliner_info
1862 (bfd *, const char **, const char **, unsigned int *);
1863 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1864 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1865 extern int _bfd_elf_sizeof_headers
1866 (bfd *, struct bfd_link_info *);
1867 extern bfd_boolean _bfd_elf_new_section_hook
1868 (bfd *, asection *);
1869 extern bfd_boolean _bfd_elf_init_reloc_shdr
1870 (bfd *, struct bfd_elf_section_reloc_data *, asection *, bfd_boolean);
1871 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1872 (const char *, const struct bfd_elf_special_section *, unsigned int);
1873 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1874 (bfd *, asection *);
1876 /* If the target doesn't have reloc handling written yet: */
1877 extern void _bfd_elf_no_info_to_howto
1878 (bfd *, arelent *, Elf_Internal_Rela *);
1880 extern bfd_boolean bfd_section_from_shdr
1881 (bfd *, unsigned int shindex);
1882 extern bfd_boolean bfd_section_from_phdr
1883 (bfd *, Elf_Internal_Phdr *, int);
1885 extern int _bfd_elf_symbol_from_bfd_symbol
1886 (bfd *, asymbol **);
1888 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1889 (struct sym_cache *, bfd *, unsigned long);
1890 extern asection *bfd_section_from_elf_index
1891 (bfd *, unsigned int);
1892 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1895 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1897 extern void _bfd_elf_strtab_free
1898 (struct elf_strtab_hash *);
1899 extern bfd_size_type _bfd_elf_strtab_add
1900 (struct elf_strtab_hash *, const char *, bfd_boolean);
1901 extern void _bfd_elf_strtab_addref
1902 (struct elf_strtab_hash *, bfd_size_type);
1903 extern void _bfd_elf_strtab_delref
1904 (struct elf_strtab_hash *, bfd_size_type);
1905 extern void _bfd_elf_strtab_clear_all_refs
1906 (struct elf_strtab_hash *);
1907 extern bfd_size_type _bfd_elf_strtab_size
1908 (struct elf_strtab_hash *);
1909 extern bfd_size_type _bfd_elf_strtab_offset
1910 (struct elf_strtab_hash *, bfd_size_type);
1911 extern bfd_boolean _bfd_elf_strtab_emit
1912 (bfd *, struct elf_strtab_hash *);
1913 extern void _bfd_elf_strtab_finalize
1914 (struct elf_strtab_hash *);
1916 extern void _bfd_elf_begin_eh_frame_parsing
1917 (struct bfd_link_info *info);
1918 extern void _bfd_elf_parse_eh_frame
1919 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1920 extern void _bfd_elf_end_eh_frame_parsing
1921 (struct bfd_link_info *info);
1923 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1924 (bfd *, struct bfd_link_info *, asection *,
1925 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1926 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1927 (bfd *, struct bfd_link_info *);
1928 extern bfd_vma _bfd_elf_eh_frame_section_offset
1929 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1930 extern bfd_boolean _bfd_elf_write_section_eh_frame
1931 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1932 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1933 (bfd *, struct bfd_link_info *);
1934 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1935 (struct bfd_link_info *);
1937 extern bfd_boolean _bfd_elf_merge_symbol
1938 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1939 asection **, bfd_vma *, unsigned int *,
1940 struct elf_link_hash_entry **, bfd_boolean *,
1941 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1943 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1945 extern long _bfd_elf_link_lookup_local_dynindx
1946 (struct bfd_link_info *, bfd *, long);
1947 extern bfd_boolean _bfd_elf_compute_section_file_positions
1948 (bfd *, struct bfd_link_info *);
1949 extern void _bfd_elf_assign_file_positions_for_relocs
1951 extern file_ptr _bfd_elf_assign_file_position_for_section
1952 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1954 extern bfd_boolean _bfd_elf_validate_reloc
1957 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1958 (bfd *, struct bfd_link_info *);
1959 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1960 (bfd *, struct bfd_link_info *, asection *);
1961 extern bfd_boolean _bfd_elf_create_dynamic_sections
1962 (bfd *, struct bfd_link_info *);
1963 extern bfd_boolean _bfd_elf_create_got_section
1964 (bfd *, struct bfd_link_info *);
1965 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1966 (bfd *, struct bfd_link_info *, asection *, const char *);
1967 extern void _bfd_elf_init_1_index_section
1968 (bfd *, struct bfd_link_info *);
1969 extern void _bfd_elf_init_2_index_sections
1970 (bfd *, struct bfd_link_info *);
1972 extern bfd_boolean _bfd_elfcore_make_pseudosection
1973 (bfd *, char *, size_t, ufile_ptr);
1974 extern char *_bfd_elfcore_strndup
1975 (bfd *, char *, size_t);
1977 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1978 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1980 extern bfd_boolean _bfd_elf_link_output_relocs
1981 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1982 struct elf_link_hash_entry **);
1984 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1985 (struct elf_link_hash_entry *, asection *);
1987 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1988 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1990 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1991 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1993 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1994 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1996 extern bfd_boolean _bfd_elf_setup_sections
1999 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
2001 extern const bfd_target *bfd_elf32_object_p
2003 extern const bfd_target *bfd_elf32_core_file_p
2005 extern char *bfd_elf32_core_file_failing_command
2007 extern int bfd_elf32_core_file_failing_signal
2009 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2011 extern int bfd_elf32_core_file_pid
2014 extern bfd_boolean bfd_elf32_swap_symbol_in
2015 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2016 extern void bfd_elf32_swap_symbol_out
2017 (bfd *, const Elf_Internal_Sym *, void *, void *);
2018 extern void bfd_elf32_swap_reloc_in
2019 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2020 extern void bfd_elf32_swap_reloc_out
2021 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2022 extern void bfd_elf32_swap_reloca_in
2023 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2024 extern void bfd_elf32_swap_reloca_out
2025 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2026 extern void bfd_elf32_swap_phdr_in
2027 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2028 extern void bfd_elf32_swap_phdr_out
2029 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2030 extern void bfd_elf32_swap_dyn_in
2031 (bfd *, const void *, Elf_Internal_Dyn *);
2032 extern void bfd_elf32_swap_dyn_out
2033 (bfd *, const Elf_Internal_Dyn *, void *);
2034 extern long bfd_elf32_slurp_symbol_table
2035 (bfd *, asymbol **, bfd_boolean);
2036 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2038 extern int bfd_elf32_write_out_phdrs
2039 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2040 extern bfd_boolean bfd_elf32_checksum_contents
2041 (bfd * , void (*) (const void *, size_t, void *), void *);
2042 extern void bfd_elf32_write_relocs
2043 (bfd *, asection *, void *);
2044 extern bfd_boolean bfd_elf32_slurp_reloc_table
2045 (bfd *, asection *, asymbol **, bfd_boolean);
2047 extern const bfd_target *bfd_elf64_object_p
2049 extern const bfd_target *bfd_elf64_core_file_p
2051 extern char *bfd_elf64_core_file_failing_command
2053 extern int bfd_elf64_core_file_failing_signal
2055 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2057 extern int bfd_elf64_core_file_pid
2060 extern bfd_boolean bfd_elf64_swap_symbol_in
2061 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2062 extern void bfd_elf64_swap_symbol_out
2063 (bfd *, const Elf_Internal_Sym *, void *, void *);
2064 extern void bfd_elf64_swap_reloc_in
2065 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2066 extern void bfd_elf64_swap_reloc_out
2067 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2068 extern void bfd_elf64_swap_reloca_in
2069 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2070 extern void bfd_elf64_swap_reloca_out
2071 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2072 extern void bfd_elf64_swap_phdr_in
2073 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2074 extern void bfd_elf64_swap_phdr_out
2075 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2076 extern void bfd_elf64_swap_dyn_in
2077 (bfd *, const void *, Elf_Internal_Dyn *);
2078 extern void bfd_elf64_swap_dyn_out
2079 (bfd *, const Elf_Internal_Dyn *, void *);
2080 extern long bfd_elf64_slurp_symbol_table
2081 (bfd *, asymbol **, bfd_boolean);
2082 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2084 extern int bfd_elf64_write_out_phdrs
2085 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2086 extern bfd_boolean bfd_elf64_checksum_contents
2087 (bfd * , void (*) (const void *, size_t, void *), void *);
2088 extern void bfd_elf64_write_relocs
2089 (bfd *, asection *, void *);
2090 extern bfd_boolean bfd_elf64_slurp_reloc_table
2091 (bfd *, asection *, asymbol **, bfd_boolean);
2093 extern bfd_boolean _bfd_elf_default_relocs_compatible
2094 (const bfd_target *, const bfd_target *);
2096 extern bfd_boolean _bfd_elf_relocs_compatible
2097 (const bfd_target *, const bfd_target *);
2099 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2100 (bfd *, struct bfd_link_info *, const char *);
2101 extern bfd_boolean bfd_elf_link_add_symbols
2102 (bfd *, struct bfd_link_info *);
2103 extern bfd_boolean _bfd_elf_add_dynamic_entry
2104 (struct bfd_link_info *, bfd_vma, bfd_vma);
2106 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2107 (struct bfd_link_info *, struct elf_link_hash_entry *);
2109 extern int bfd_elf_link_record_local_dynamic_symbol
2110 (struct bfd_link_info *, bfd *, long);
2112 extern bfd_boolean _bfd_elf_close_and_cleanup
2115 extern bfd_boolean _bfd_elf_common_definition
2116 (Elf_Internal_Sym *);
2118 extern unsigned int _bfd_elf_common_section_index
2121 extern asection *_bfd_elf_common_section
2124 extern void _bfd_dwarf2_cleanup_debug_info
2127 extern bfd_vma _bfd_elf_default_got_elt_size
2128 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2131 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2132 (bfd *, arelent *, struct bfd_symbol *, void *,
2133 asection *, bfd *, char **);
2135 extern bfd_boolean bfd_elf_final_link
2136 (bfd *, struct bfd_link_info *);
2138 extern void _bfd_elf_gc_keep
2139 (struct bfd_link_info *info);
2141 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2142 (struct elf_link_hash_entry *h, void *inf);
2144 extern bfd_boolean bfd_elf_gc_sections
2145 (bfd *, struct bfd_link_info *);
2147 extern bfd_boolean bfd_elf_gc_record_vtinherit
2148 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2150 extern bfd_boolean bfd_elf_gc_record_vtentry
2151 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2153 extern asection *_bfd_elf_gc_mark_hook
2154 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2155 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2157 extern asection *_bfd_elf_gc_mark_rsec
2158 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2159 struct elf_reloc_cookie *);
2161 extern bfd_boolean _bfd_elf_gc_mark_reloc
2162 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2163 struct elf_reloc_cookie *);
2165 extern bfd_boolean _bfd_elf_gc_mark_fdes
2166 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2167 struct elf_reloc_cookie *);
2169 extern bfd_boolean _bfd_elf_gc_mark
2170 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2172 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2173 (bfd *, struct bfd_link_info *);
2175 extern bfd_boolean bfd_elf_gc_common_final_link
2176 (bfd *, struct bfd_link_info *);
2178 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2181 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2182 (bfd *, asection *);
2184 extern bfd_boolean _bfd_elf_map_sections_to_segments
2185 (bfd *, struct bfd_link_info *);
2187 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2189 extern int bfd_elf_get_default_section_type (flagword);
2191 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2192 (bfd * abfd, asection * section);
2194 /* Exported interface for writing elf corefile notes. */
2195 extern char *elfcore_write_note
2196 (bfd *, char *, int *, const char *, int, const void *, int);
2197 extern char *elfcore_write_prpsinfo
2198 (bfd *, char *, int *, const char *, const char *);
2199 extern char *elfcore_write_prstatus
2200 (bfd *, char *, int *, long, int, const void *);
2201 extern char * elfcore_write_pstatus
2202 (bfd *, char *, int *, long, int, const void *);
2203 extern char *elfcore_write_prfpreg
2204 (bfd *, char *, int *, const void *, int);
2205 extern char *elfcore_write_prxfpreg
2206 (bfd *, char *, int *, const void *, int);
2207 extern char *elfcore_write_xstatereg
2208 (bfd *, char *, int *, const void *, int);
2209 extern char *elfcore_write_ppc_vmx
2210 (bfd *, char *, int *, const void *, int);
2211 extern char *elfcore_write_ppc_vsx
2212 (bfd *, char *, int *, const void *, int);
2213 extern char *elfcore_write_s390_timer
2214 (bfd *, char *, int *, const void *, int);
2215 extern char *elfcore_write_s390_todcmp
2216 (bfd *, char *, int *, const void *, int);
2217 extern char *elfcore_write_s390_todpreg
2218 (bfd *, char *, int *, const void *, int);
2219 extern char *elfcore_write_s390_ctrs
2220 (bfd *, char *, int *, const void *, int);
2221 extern char *elfcore_write_s390_prefix
2222 (bfd *, char *, int *, const void *, int);
2223 extern char *elfcore_write_lwpstatus
2224 (bfd *, char *, int *, long, int, const void *);
2225 extern char *elfcore_write_register_note
2226 (bfd *, char *, int *, const char *, const void *, int);
2228 extern bfd *_bfd_elf32_bfd_from_remote_memory
2229 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2230 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2231 extern bfd *_bfd_elf64_bfd_from_remote_memory
2232 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2233 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2235 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2236 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2237 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2238 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2239 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2240 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2241 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2242 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2243 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2244 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2246 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2247 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2250 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2251 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2252 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2253 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2254 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2255 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2256 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2257 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2259 /* The linker may need to keep track of the number of relocs that it
2260 decides to copy as dynamic relocs in check_relocs for each symbol.
2261 This is so that it can later discard them if they are found to be
2262 unnecessary. We can store the information in a field extending the
2263 regular ELF linker hash table. */
2265 struct elf_dyn_relocs
2267 struct elf_dyn_relocs *next;
2269 /* The input section of the reloc. */
2272 /* Total number of relocs copied for the input section. */
2273 bfd_size_type count;
2275 /* Number of pc-relative relocs copied for the input section. */
2276 bfd_size_type pc_count;
2279 extern bfd_boolean _bfd_elf_create_ifunc_sections
2280 (bfd *, struct bfd_link_info *);
2281 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2282 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2283 struct elf_dyn_relocs **);
2284 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2285 (struct bfd_link_info *, struct elf_link_hash_entry *,
2286 struct elf_dyn_relocs **, unsigned int, unsigned int);
2288 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2289 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2291 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2292 extern bfd_vma elf64_r_sym (bfd_vma);
2293 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2294 extern bfd_vma elf32_r_sym (bfd_vma);
2296 /* Large common section. */
2297 extern asection _bfd_elf_large_com_section;
2299 /* Hash for local symbol with the first section id, ID, in the input
2300 file and the local symbol index, SYM. */
2301 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2302 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2303 ^ (SYM) ^ ((ID) >> 16))
2305 /* This is the condition under which finish_dynamic_symbol will be called.
2306 If our finish_dynamic_symbol isn't called, we'll need to do something
2307 about initializing any .plt and .got entries in relocate_section. */
2308 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2310 && ((SHARED) || !(H)->forced_local) \
2311 && ((H)->dynindx != -1 || (H)->forced_local))
2313 /* This macro is to avoid lots of duplicated code in the body
2314 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2315 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2316 r_symndx, symtab_hdr, sym_hashes, \
2317 h, sec, relocation, \
2318 unresolved_reloc, warned) \
2321 /* It seems this can happen with erroneous or unsupported \
2322 input (mixing a.out and elf in an archive, for example.) */ \
2323 if (sym_hashes == NULL) \
2326 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2328 while (h->root.type == bfd_link_hash_indirect \
2329 || h->root.type == bfd_link_hash_warning) \
2330 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2333 unresolved_reloc = FALSE; \
2335 if (h->root.type == bfd_link_hash_defined \
2336 || h->root.type == bfd_link_hash_defweak) \
2338 sec = h->root.u.def.section; \
2340 || sec->output_section == NULL) \
2341 /* Set a flag that will be cleared later if we find a \
2342 relocation value for this symbol. output_section \
2343 is typically NULL for symbols satisfied by a shared \
2345 unresolved_reloc = TRUE; \
2347 relocation = (h->root.u.def.value \
2348 + sec->output_section->vma \
2349 + sec->output_offset); \
2351 else if (h->root.type == bfd_link_hash_undefweak) \
2353 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2354 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2356 else if (!info->relocatable) \
2359 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2360 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2361 if (!info->callbacks->undefined_symbol (info, \
2362 h->root.root.string, \
2365 rel->r_offset, err)) \
2369 (void) unresolved_reloc; \
2374 /* This macro is to avoid lots of duplicated code in the body of the
2375 loop over relocations in xxx_relocate_section() in the various
2378 Handle relocations against symbols from removed linkonce sections,
2379 or sections discarded by a linker script. When doing a relocatable
2380 link, we remove such relocations. Otherwise, we just want the
2381 section contents zeroed and avoid any special processing. */
2382 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2383 rel, relend, howto, contents) \
2385 _bfd_clear_contents (howto, input_bfd, input_section, \
2386 contents + rel->r_offset); \
2388 if (info->relocatable \
2389 && (input_section->flags & SEC_DEBUGGING)) \
2391 /* Only remove relocations in debug sections since other \
2392 sections may require relocations. */ \
2393 Elf_Internal_Shdr *rel_hdr; \
2395 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2397 /* Avoid empty output section. */ \
2398 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2400 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2401 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2402 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2404 memmove (rel, rel + 1, (relend - rel - 1) * sizeof (*rel)); \
2406 input_section->reloc_count--; \
2414 rel->r_addend = 0; \
2418 /* Will a symbol be bound to the the definition within the shared
2419 library, if any. A unique symbol can never be bound locally. */
2420 #define SYMBOLIC_BIND(INFO, H) \
2421 (!(H)->unique_global \
2422 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2424 #endif /* _LIBELF_H_ */