1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2016 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
25 #include "elf/common.h"
26 #include "elf/external.h"
27 #include "elf/internal.h"
34 /* The number of entries in a section is its size divided by the size
35 of a single entry. This is normally only applicable to reloc and
36 symbol table sections.
37 PR 9934: It is possible to have relocations that do not refer to
38 symbols, thus it is also possible to have a relocation section in
39 an object file, but no symbol table. */
40 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
42 /* If size isn't specified as 64 or 32, NAME macro should fail. */
45 #define NAME(x, y) x ## 64 ## _ ## y
48 #define NAME(x, y) x ## 32 ## _ ## y
53 #define NAME(x, y) x ## NOSIZE ## _ ## y
56 #define ElfNAME(X) NAME(Elf,X)
57 #define elfNAME(X) NAME(elf,X)
59 /* Information held for an ELF symbol. The first field is the
60 corresponding asymbol. Every symbol is an ELF file is actually a
61 pointer to this structure, although it is often handled as a
62 pointer to an asymbol. */
68 /* ELF symbol information. */
69 Elf_Internal_Sym internal_elf_sym;
70 /* Backend specific information. */
73 unsigned int hppa_arg_reloc;
79 /* Version information. This is from an Elf_Internal_Versym
80 structure in a SHT_GNU_versym section. It is zero if there is no
81 version information. */
82 unsigned short version;
86 struct elf_strtab_hash;
92 bfd_signed_vma refcount;
94 struct got_entry *glist;
95 struct plt_entry *plist;
98 struct elf_link_virtual_table_entry
100 /* Virtual table entry use information. This array is nominally of size
101 size/sizeof(target_void_pointer), though we have to be able to assume
102 and track a size while the symbol is still undefined. It is indexed
103 via offset/sizeof(target_void_pointer). */
107 /* Virtual table derivation info. */
108 struct elf_link_hash_entry *parent;
111 /* ELF symbol version. */
112 enum elf_symbol_version
120 /* ELF linker hash table entries. */
122 struct elf_link_hash_entry
124 struct bfd_link_hash_entry root;
126 /* Symbol index in output file. This is initialized to -1. It is
127 set to -2 if the symbol is used by a reloc. It is set to -3 if
128 this symbol is defined in a discarded section. */
131 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
132 -1 if this is not a dynamic symbol. */
133 /* ??? Note that this is consistently used as a synonym for tests
134 against whether we can perform various simplifying transformations
135 to the code. (E.g. changing a pc-relative jump to a PLT entry
136 into a pc-relative jump to the target function.) That test, which
137 is often relatively complex, and someplaces wrong or incomplete,
138 should really be replaced by a predicate in elflink.c.
140 End result: this field -1 does not indicate that the symbol is
141 not in the dynamic symbol table, but rather that the symbol is
142 not visible outside this DSO. */
145 /* If this symbol requires an entry in the global offset table, the
146 processor specific backend uses this field to track usage and
147 final offset. Two schemes are supported: The first assumes that
148 a symbol may only have one GOT entry, and uses REFCOUNT until
149 size_dynamic_sections, at which point the contents of the .got is
150 fixed. Afterward, if OFFSET is -1, then the symbol does not
151 require a global offset table entry. The second scheme allows
152 multiple GOT entries per symbol, managed via a linked list
153 pointed to by GLIST. */
154 union gotplt_union got;
156 /* Same, but tracks a procedure linkage table entry. */
157 union gotplt_union plt;
162 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
163 unsigned int type : 8;
165 /* Symbol st_other value, symbol visibility. */
166 unsigned int other : 8;
168 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
169 unsigned int target_internal : 8;
171 /* Symbol is referenced by a non-shared object (other than the object
172 in which it is defined). */
173 unsigned int ref_regular : 1;
174 /* Symbol is defined by a non-shared object. */
175 unsigned int def_regular : 1;
176 /* Symbol is referenced by a shared object. */
177 unsigned int ref_dynamic : 1;
178 /* Symbol is defined by a shared object. */
179 unsigned int def_dynamic : 1;
180 /* Symbol has a non-weak reference from a non-shared object (other than
181 the object in which it is defined). */
182 unsigned int ref_regular_nonweak : 1;
183 /* Dynamic symbol has been adjustd. */
184 unsigned int dynamic_adjusted : 1;
185 /* Symbol needs a copy reloc. */
186 unsigned int needs_copy : 1;
187 /* Symbol needs a procedure linkage table entry. */
188 unsigned int needs_plt : 1;
189 /* Symbol appears in a non-ELF input file. */
190 unsigned int non_elf : 1;
191 /* Symbol version information. */
192 ENUM_BITFIELD (elf_symbol_version) versioned : 2;
193 /* Symbol was forced to local scope due to a version script file. */
194 unsigned int forced_local : 1;
195 /* Symbol was forced to be dynamic due to a version script file. */
196 unsigned int dynamic : 1;
197 /* Symbol was marked during garbage collection. */
198 unsigned int mark : 1;
199 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
200 not currently set by all the backends. */
201 unsigned int non_got_ref : 1;
202 /* Symbol has a definition in a shared object.
203 FIXME: There is no real need for this field if def_dynamic is never
204 cleared and all places that test def_dynamic also test def_regular. */
205 unsigned int dynamic_def : 1;
206 /* Symbol has a non-weak reference from a shared object. */
207 unsigned int ref_dynamic_nonweak : 1;
208 /* Symbol is referenced with a relocation where C/C++ pointer equality
210 unsigned int pointer_equality_needed : 1;
211 /* Symbol is a unique global symbol. */
212 unsigned int unique_global : 1;
213 /* Symbol is defined by a shared library with non-default visibility
214 in a read/write section. */
215 unsigned int protected_def : 1;
217 /* String table index in .dynstr if this is a dynamic symbol. */
218 unsigned long dynstr_index;
222 /* If this is a weak defined symbol from a dynamic object, this
223 field points to a defined symbol with the same value, if there is
224 one. Otherwise it is NULL. */
225 struct elf_link_hash_entry *weakdef;
227 /* Hash value of the name computed using the ELF hash function.
228 Used part way through size_dynamic_sections, after we've finished
230 unsigned long elf_hash_value;
233 /* Version information. */
236 /* This field is used for a symbol which is not defined in a
237 regular object. It points to the version information read in
238 from the dynamic object. */
239 Elf_Internal_Verdef *verdef;
240 /* This field is used for a symbol which is defined in a regular
241 object. It is set up in size_dynamic_sections. It points to
242 the version information we should write out for this symbol. */
243 struct bfd_elf_version_tree *vertree;
246 struct elf_link_virtual_table_entry *vtable;
249 /* Will references to this symbol always reference the symbol
251 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
252 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
254 /* Will _calls_ to this symbol always call the version in this object? */
255 #define SYMBOL_CALLS_LOCAL(INFO, H) \
256 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
258 /* Common symbols that are turned into definitions don't have the
259 DEF_REGULAR flag set, so they might appear to be undefined.
260 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
261 #define ELF_COMMON_DEF_P(H) \
263 && !(H)->def_dynamic \
264 && (H)->root.type == bfd_link_hash_defined)
266 /* Records local symbols to be emitted in the dynamic symbol table. */
268 struct elf_link_local_dynamic_entry
270 struct elf_link_local_dynamic_entry *next;
272 /* The input bfd this symbol came from. */
275 /* The index of the local symbol being copied. */
278 /* The index in the outgoing dynamic symbol table. */
281 /* A copy of the input symbol. */
282 Elf_Internal_Sym isym;
285 struct elf_link_loaded_list
287 struct elf_link_loaded_list *next;
291 /* Structures used by the eh_frame optimization code. */
296 /* If REMOVED == 1, this is the CIE that the FDE originally used.
297 The CIE belongs to the same .eh_frame input section as the FDE.
299 If REMOVED == 0, this is the CIE that we have chosen to use for
300 the output FDE. The CIE's REMOVED field is also 0, but the CIE
301 might belong to a different .eh_frame input section from the FDE.
303 May be NULL to signify that the FDE should be discarded. */
304 struct eh_cie_fde *cie_inf;
305 struct eh_cie_fde *next_for_section;
308 /* CIEs have three states:
310 - REMOVED && !MERGED: Slated for removal because we haven't yet
311 proven that an FDE needs it. FULL_CIE, if nonnull, points to
312 more detailed information about the CIE.
314 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
315 which may not belong to the same input section.
317 - !REMOVED: We have decided to keep this CIE. SEC is the
318 .eh_frame input section that contains the CIE. */
320 struct cie *full_cie;
321 struct eh_cie_fde *merged_with;
325 /* The offset of the personality data from the start of the CIE,
326 or 0 if the CIE doesn't have any. */
327 unsigned int personality_offset : 8;
329 /* True if we have marked relocations associated with this CIE. */
330 unsigned int gc_mark : 1;
332 /* True if we have decided to turn an absolute LSDA encoding into
333 a PC-relative one. */
334 unsigned int make_lsda_relative : 1;
336 /* True if we have decided to turn an absolute personality
337 encoding into a PC-relative one. */
338 unsigned int make_per_encoding_relative : 1;
340 /* True if the CIE contains personality data and if that
341 data uses a PC-relative encoding. Always true when
342 make_per_encoding_relative is. */
343 unsigned int per_encoding_relative : 1;
345 /* True if we need to add an 'R' (FDE encoding) entry to the
346 CIE's augmentation data. */
347 unsigned int add_fde_encoding : 1;
349 /* True if we have merged this CIE with another. */
350 unsigned int merged : 1;
353 unsigned int pad1 : 18;
356 unsigned int reloc_index;
359 unsigned int new_offset;
360 unsigned int fde_encoding : 8;
361 unsigned int lsda_encoding : 8;
362 unsigned int lsda_offset : 8;
364 /* True if this entry represents a CIE, false if it represents an FDE. */
365 unsigned int cie : 1;
367 /* True if this entry is currently marked for removal. */
368 unsigned int removed : 1;
370 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
371 augmentation data, and an associated byte to each of the CIE's FDEs. */
372 unsigned int add_augmentation_size : 1;
374 /* True if we have decided to convert absolute FDE relocations into
375 relative ones. This applies to the first relocation in the FDE,
376 which is against the code that the FDE describes. */
377 unsigned int make_relative : 1;
380 unsigned int pad1 : 4;
382 unsigned int *set_loc;
385 struct eh_frame_sec_info
389 struct eh_cie_fde entry[1];
392 struct eh_frame_array_ent
401 #define DWARF2_EH_HDR 1
402 #define COMPACT_EH_HDR 2
404 /* Endian-neutral code indicating that a function cannot be unwound. */
405 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
407 struct dwarf_eh_frame_hdr_info
410 unsigned int fde_count;
411 /* TRUE if .eh_frame_hdr should contain the sorted search table.
412 We build it if we successfully read all .eh_frame input sections
413 and recognize them. */
415 struct eh_frame_array_ent *array;
418 struct compact_eh_frame_hdr_info
420 unsigned int allocated_entries;
421 /* eh_frame_entry fragments. */
425 struct eh_frame_hdr_info
428 unsigned int array_count;
429 bfd_boolean frame_hdr_is_compact;
432 struct dwarf_eh_frame_hdr_info dwarf;
433 struct compact_eh_frame_hdr_info compact;
438 /* Enum used to identify target specific extensions to the elf_obj_tdata
439 and elf_link_hash_table structures. Note the enums deliberately start
440 from 1 so that we can detect an uninitialized field. The generic value
441 is last so that additions to this enum do not need to modify more than
445 AARCH64_ELF_DATA = 1,
482 struct elf_sym_strtab
484 Elf_Internal_Sym sym;
485 unsigned long dest_index;
486 unsigned long destshndx_index;
489 /* ELF linker hash table. */
491 struct elf_link_hash_table
493 struct bfd_link_hash_table root;
495 /* An identifier used to distinguish different target
496 specific extensions to this structure. */
497 enum elf_target_id hash_table_id;
499 /* Whether we have created the special dynamic sections required
500 when linking against or generating a shared object. */
501 bfd_boolean dynamic_sections_created;
503 /* True if this target has relocatable executables, so needs dynamic
505 bfd_boolean is_relocatable_executable;
507 /* The BFD used to hold special sections created by the linker.
508 This will be the first BFD found which requires these sections to
512 /* The value to use when initialising got.refcount/offset and
513 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
514 the values are refcounts. Set to init_got_offset/init_plt_offset
515 in size_dynamic_sections when the values may be offsets. */
516 union gotplt_union init_got_refcount;
517 union gotplt_union init_plt_refcount;
519 /* The value to use for got.refcount/offset and plt.refcount/offset
520 when the values may be offsets. Normally (bfd_vma) -1. */
521 union gotplt_union init_got_offset;
522 union gotplt_union init_plt_offset;
524 /* The number of symbols found in the link which is intended for the
525 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */
526 bfd_size_type dynsymcount;
528 /* The string table of dynamic symbols, which becomes the .dynstr
530 struct elf_strtab_hash *dynstr;
532 /* The number of symbol strings found in the link which must be put
533 into the .strtab section. */
534 bfd_size_type strtabcount;
536 /* The array size of the symbol string table, which becomes the
538 bfd_size_type strtabsize;
540 /* The array of strings, which becomes the .strtab section. */
541 struct elf_sym_strtab *strtab;
543 /* The number of buckets in the hash table in the .hash section.
544 This is based on the number of dynamic symbols. */
545 bfd_size_type bucketcount;
547 /* A linked list of DT_NEEDED names found in dynamic objects
548 included in the link. */
549 struct bfd_link_needed_list *needed;
551 /* Sections in the output bfd that provides a section symbol
552 to be used by relocations emitted against local symbols.
553 Most targets will not use data_index_section. */
554 asection *text_index_section;
555 asection *data_index_section;
557 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
558 struct elf_link_hash_entry *hgot;
560 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
561 struct elf_link_hash_entry *hplt;
563 /* The _DYNAMIC symbol. */
564 struct elf_link_hash_entry *hdynamic;
566 /* A pointer to information used to merge SEC_MERGE sections. */
569 /* Used to link stabs in sections. */
570 struct stab_info stab_info;
572 /* Used by eh_frame code when editing .eh_frame. */
573 struct eh_frame_hdr_info eh_info;
575 /* A linked list of local symbols to be added to .dynsym. */
576 struct elf_link_local_dynamic_entry *dynlocal;
578 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
579 objects included in the link. */
580 struct bfd_link_needed_list *runpath;
582 /* Cached first output tls section and size of PT_TLS segment. */
584 bfd_size_type tls_size;
586 /* A linked list of BFD's loaded in the link. */
587 struct elf_link_loaded_list *loaded;
589 /* Short-cuts to get to dynamic linker sections. */
602 /* Look up an entry in an ELF linker hash table. */
604 #define elf_link_hash_lookup(table, string, create, copy, follow) \
605 ((struct elf_link_hash_entry *) \
606 bfd_link_hash_lookup (&(table)->root, (string), (create), \
609 /* Traverse an ELF linker hash table. */
611 #define elf_link_hash_traverse(table, func, info) \
612 (bfd_link_hash_traverse \
614 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
617 /* Get the ELF linker hash table from a link_info structure. */
619 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
621 #define elf_hash_table_id(table) ((table) -> hash_table_id)
623 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
624 #define is_elf_hash_table(htab) \
625 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
627 /* Used by bfd_sym_from_r_symndx to cache a small number of local
629 #define LOCAL_SYM_CACHE_SIZE 32
633 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
634 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
637 /* Constant information held for an ELF backend. */
639 struct elf_size_info {
640 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
641 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
643 /* The size of entries in the .hash section. */
644 unsigned char sizeof_hash_entry;
646 /* The number of internal relocations to allocate per external
648 unsigned char int_rels_per_ext_rel;
649 /* We use some fixed size arrays. This should be large enough to
650 handle all back-ends. */
651 #define MAX_INT_RELS_PER_EXT_REL 3
653 unsigned char arch_size, log_file_align;
654 unsigned char elfclass, ev_current;
655 int (*write_out_phdrs)
656 (bfd *, const Elf_Internal_Phdr *, unsigned int);
658 (*write_shdrs_and_ehdr) (bfd *);
659 bfd_boolean (*checksum_contents)
660 (bfd * , void (*) (const void *, size_t, void *), void *);
662 (bfd *, asection *, void *);
663 bfd_boolean (*swap_symbol_in)
664 (bfd *, const void *, const void *, Elf_Internal_Sym *);
665 void (*swap_symbol_out)
666 (bfd *, const Elf_Internal_Sym *, void *, void *);
667 bfd_boolean (*slurp_reloc_table)
668 (bfd *, asection *, asymbol **, bfd_boolean);
669 long (*slurp_symbol_table)
670 (bfd *, asymbol **, bfd_boolean);
672 (bfd *, const void *, Elf_Internal_Dyn *);
674 (bfd *, const Elf_Internal_Dyn *, void *);
676 /* This function is called to swap in a REL relocation. If an
677 external relocation corresponds to more than one internal
678 relocation, then all relocations are swapped in at once. */
679 void (*swap_reloc_in)
680 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
682 /* This function is called to swap out a REL relocation. */
683 void (*swap_reloc_out)
684 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
686 /* This function is called to swap in a RELA relocation. If an
687 external relocation corresponds to more than one internal
688 relocation, then all relocations are swapped in at once. */
689 void (*swap_reloca_in)
690 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
692 /* This function is called to swap out a RELA relocation. */
693 void (*swap_reloca_out)
694 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
697 #define elf_symbol_from(ABFD,S) \
698 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
699 && (S)->the_bfd->tdata.elf_obj_data != 0) \
700 ? (elf_symbol_type *) (S) \
703 enum elf_reloc_type_class {
705 reloc_class_relative,
711 struct elf_reloc_cookie
713 Elf_Internal_Rela *rels, *rel, *relend;
714 Elf_Internal_Sym *locsyms;
718 struct elf_link_hash_entry **sym_hashes;
720 bfd_boolean bad_symtab;
723 /* The level of IRIX compatibility we're striving for. */
731 /* Mapping of ELF section names and types. */
732 struct bfd_elf_special_section
735 unsigned int prefix_length;
736 /* 0 means name must match PREFIX exactly.
737 -1 means name must start with PREFIX followed by an arbitrary string.
738 -2 means name must match PREFIX exactly or consist of PREFIX followed
739 by a dot then anything.
740 > 0 means name must start with the first PREFIX_LENGTH chars of
741 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
742 signed int suffix_length;
747 enum action_discarded
753 typedef asection * (*elf_gc_mark_hook_fn)
754 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
755 struct elf_link_hash_entry *, Elf_Internal_Sym *);
757 enum elf_property_kind
759 /* A new property. */
760 property_unknown = 0,
761 /* A property ignored by backend. */
763 /* A corrupt property reported by backend. */
765 /* A property should be removed due to property merge. */
767 /* A property which is a number. */
771 typedef struct elf_property
773 unsigned int pr_type;
774 unsigned int pr_datasz;
777 /* For property_number, this is a number. */
779 /* Add a new one if elf_property_kind is updated. */
781 enum elf_property_kind pr_kind;
782 const char *filename;
785 typedef struct elf_property_list
787 struct elf_property_list *next;
788 struct elf_property property;
791 struct bfd_elf_section_reloc_data;
793 struct elf_backend_data
795 /* The architecture for this backend. */
796 enum bfd_architecture arch;
798 /* An identifier used to distinguish different target specific
799 extensions to elf_obj_tdata and elf_link_hash_table structures. */
800 enum elf_target_id target_id;
802 /* The ELF machine code (EM_xxxx) for this backend. */
803 int elf_machine_code;
808 /* The maximum page size for this backend. */
811 /* The minimum page size for this backend. An input object will not be
812 considered page aligned unless its sections are correctly aligned for
813 pages at least this large. May be smaller than maxpagesize. */
816 /* The common page size for this backend. */
817 bfd_vma commonpagesize;
819 /* The BFD flags applied to sections created for dynamic linking. */
820 flagword dynamic_sec_flags;
822 /* Architecture-specific data for this backend.
823 This is actually a pointer to some type like struct elf_ARCH_data. */
824 const void *arch_data;
826 /* A function to translate an ELF RELA relocation to a BFD arelent
828 void (*elf_info_to_howto)
829 (bfd *, arelent *, Elf_Internal_Rela *);
831 /* A function to translate an ELF REL relocation to a BFD arelent
833 void (*elf_info_to_howto_rel)
834 (bfd *, arelent *, Elf_Internal_Rela *);
836 /* A function to determine whether a symbol is global when
837 partitioning the symbol table into local and global symbols.
838 This should be NULL for most targets, in which case the correct
839 thing will be done. MIPS ELF, at least on the Irix 5, has
840 special requirements. */
841 bfd_boolean (*elf_backend_sym_is_global)
844 /* The remaining functions are hooks which are called only if they
847 /* A function to permit a backend specific check on whether a
848 particular BFD format is relevant for an object file, and to
849 permit the backend to set any global information it wishes. When
850 this is called elf_elfheader is set, but anything else should be
851 used with caution. If this returns FALSE, the check_format
852 routine will return a bfd_error_wrong_format error. */
853 bfd_boolean (*elf_backend_object_p)
856 /* A function to do additional symbol processing when reading the
857 ELF symbol table. This is where any processor-specific special
858 section indices are handled. */
859 void (*elf_backend_symbol_processing)
862 /* A function to do additional symbol processing after reading the
863 entire ELF symbol table. */
864 bfd_boolean (*elf_backend_symbol_table_processing)
865 (bfd *, elf_symbol_type *, unsigned int);
867 /* A function to set the type of the info field. Processor-specific
868 types should be handled here. */
869 int (*elf_backend_get_symbol_type)
870 (Elf_Internal_Sym *, int);
872 /* A function to return the linker hash table entry of a symbol that
873 might be satisfied by an archive symbol. */
874 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
875 (bfd *, struct bfd_link_info *, const char *);
877 /* Return true if local section symbols should have a non-null st_name.
878 NULL implies false. */
879 bfd_boolean (*elf_backend_name_local_section_symbols)
882 /* A function to do additional processing on the ELF section header
883 just before writing it out. This is used to set the flags and
884 type fields for some sections, or to actually write out data for
886 bfd_boolean (*elf_backend_section_processing)
887 (bfd *, Elf_Internal_Shdr *);
889 /* A function to handle unusual section types when creating BFD
890 sections from ELF sections. */
891 bfd_boolean (*elf_backend_section_from_shdr)
892 (bfd *, Elf_Internal_Shdr *, const char *, int);
894 /* A function to convert machine dependent ELF section header flags to
895 BFD internal section header flags. */
896 bfd_boolean (*elf_backend_section_flags)
897 (flagword *, const Elf_Internal_Shdr *);
899 /* A function that returns a struct containing ELF section flags and
900 type for the given BFD section. */
901 const struct bfd_elf_special_section * (*get_sec_type_attr)
904 /* A function to handle unusual program segment types when creating BFD
905 sections from ELF program segments. */
906 bfd_boolean (*elf_backend_section_from_phdr)
907 (bfd *, Elf_Internal_Phdr *, int, const char *);
909 /* A function to set up the ELF section header for a BFD section in
910 preparation for writing it out. This is where the flags and type
911 fields are set for unusual sections. */
912 bfd_boolean (*elf_backend_fake_sections)
913 (bfd *, Elf_Internal_Shdr *, asection *);
915 /* A function to get the ELF section index for a BFD section. If
916 this returns TRUE, the section was found. If it is a normal ELF
917 section, *RETVAL should be left unchanged. If it is not a normal
918 ELF section *RETVAL should be set to the SHN_xxxx index. */
919 bfd_boolean (*elf_backend_section_from_bfd_section)
920 (bfd *, asection *, int *retval);
922 /* If this field is not NULL, it is called by the add_symbols phase
923 of a link just before adding a symbol to the global linker hash
924 table. It may modify any of the fields as it wishes. If *NAME
925 is set to NULL, the symbol will be skipped rather than being
926 added to the hash table. This function is responsible for
927 handling all processor dependent symbol bindings and section
928 indices, and must set at least *FLAGS and *SEC for each processor
929 dependent case; failure to do so will cause a link error. */
930 bfd_boolean (*elf_add_symbol_hook)
931 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
932 const char **name, flagword *flags, asection **sec, bfd_vma *value);
934 /* If this field is not NULL, it is called by the elf_link_output_sym
935 phase of a link for each symbol which will appear in the object file.
936 On error, this function returns 0. 1 is returned when the symbol
937 should be output, 2 is returned when the symbol should be discarded. */
938 int (*elf_backend_link_output_symbol_hook)
939 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
940 asection *, struct elf_link_hash_entry *);
942 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
943 linker the first time it encounters a dynamic object in the link.
944 This function must create any sections required for dynamic
945 linking. The ABFD argument is a dynamic object. The .interp,
946 .dynamic, .dynsym, .dynstr, and .hash functions have already been
947 created, and this function may modify the section flags if
948 desired. This function will normally create the .got and .plt
949 sections, but different backends have different requirements. */
950 bfd_boolean (*elf_backend_create_dynamic_sections)
951 (bfd *abfd, struct bfd_link_info *info);
953 /* When creating a shared library, determine whether to omit the
954 dynamic symbol for the section. */
955 bfd_boolean (*elf_backend_omit_section_dynsym)
956 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
958 /* Return TRUE if relocations of targets are compatible to the extent
959 that CHECK_RELOCS will properly process them. PR 4424. */
960 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
962 /* The CHECK_RELOCS function is called by the add_symbols phase of
963 the ELF backend linker. It is called once for each section with
964 relocs of an object file, just after the symbols for the object
965 file have been added to the global linker hash table. The
966 function must look through the relocs and do any special handling
967 required. This generally means allocating space in the global
968 offset table, and perhaps allocating space for a reloc. The
969 relocs are always passed as Rela structures; if the section
970 actually uses Rel structures, the r_addend field will always be
972 bfd_boolean (*check_relocs)
973 (bfd *abfd, struct bfd_link_info *info, asection *o,
974 const Elf_Internal_Rela *relocs);
976 /* The CHECK_DIRECTIVES function is called once per input file by
977 the add_symbols phase of the ELF backend linker. The function
978 must inspect the bfd and create any additional symbols according
979 to any custom directives in the bfd. */
980 bfd_boolean (*check_directives)
981 (bfd *abfd, struct bfd_link_info *info);
983 /* The NOTICE_AS_NEEDED function is called as the linker is about to
984 handle an as-needed lib (ACT = notice_as_needed), and after the
985 linker has decided to keep the lib (ACT = notice_needed) or when
986 the lib is not needed (ACT = notice_not_needed). */
987 bfd_boolean (*notice_as_needed)
988 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
990 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
991 linker for every symbol which is defined by a dynamic object and
992 referenced by a regular object. This is called after all the
993 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
994 function has been called. The hash table entry should be
995 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
996 defined in a section from a dynamic object. Dynamic object
997 sections are not included in the final link, and this function is
998 responsible for changing the value to something which the rest of
999 the link can deal with. This will normally involve adding an
1000 entry to the .plt or .got or some such section, and setting the
1001 symbol to point to that. */
1002 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
1003 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
1005 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
1006 after all the linker input files have been seen but before the
1007 section sizes have been set. This is called after
1008 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
1009 bfd_boolean (*elf_backend_always_size_sections)
1010 (bfd *output_bfd, struct bfd_link_info *info);
1012 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
1013 linker after all the linker input files have been seen but before
1014 the sections sizes have been set. This is called after
1015 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
1016 It is only called when linking against a dynamic object. It must
1017 set the sizes of the dynamic sections, and may fill in their
1018 contents as well. The generic ELF linker can handle the .dynsym,
1019 .dynstr and .hash sections. This function must handle the
1020 .interp section and any sections created by the
1021 CREATE_DYNAMIC_SECTIONS entry point. */
1022 bfd_boolean (*elf_backend_size_dynamic_sections)
1023 (bfd *output_bfd, struct bfd_link_info *info);
1025 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
1026 we keep to use as a base for relocs and symbols. */
1027 void (*elf_backend_init_index_section)
1028 (bfd *output_bfd, struct bfd_link_info *info);
1030 /* The RELOCATE_SECTION function is called by the ELF backend linker
1031 to handle the relocations for a section.
1033 The relocs are always passed as Rela structures; if the section
1034 actually uses Rel structures, the r_addend field will always be
1037 This function is responsible for adjust the section contents as
1038 necessary, and (if using Rela relocs and generating a
1039 relocatable output file) adjusting the reloc addend as
1042 This function does not have to worry about setting the reloc
1043 address or the reloc symbol index.
1045 LOCAL_SYMS is a pointer to the swapped in local symbols.
1047 LOCAL_SECTIONS is an array giving the section in the input file
1048 corresponding to the st_shndx field of each local symbol.
1050 The global hash table entry for the global symbols can be found
1051 via elf_sym_hashes (input_bfd).
1053 When generating relocatable output, this function must handle
1054 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1055 going to be the section symbol corresponding to the output
1056 section, which means that the addend must be adjusted
1059 Returns FALSE on error, TRUE on success, 2 if successful and
1060 relocations should be written for this section. */
1061 int (*elf_backend_relocate_section)
1062 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1063 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1064 Elf_Internal_Sym *local_syms, asection **local_sections);
1066 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1067 linker just before it writes a symbol out to the .dynsym section.
1068 The processor backend may make any required adjustment to the
1069 symbol. It may also take the opportunity to set contents of the
1070 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1071 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1072 on those symbols which are defined by a dynamic object. */
1073 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1074 (bfd *output_bfd, struct bfd_link_info *info,
1075 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1077 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1078 linker just before it writes all the dynamic sections out to the
1079 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1080 all dynamic symbols. */
1081 bfd_boolean (*elf_backend_finish_dynamic_sections)
1082 (bfd *output_bfd, struct bfd_link_info *info);
1084 /* A function to do any beginning processing needed for the ELF file
1085 before building the ELF headers and computing file positions. */
1086 void (*elf_backend_begin_write_processing)
1087 (bfd *, struct bfd_link_info *);
1089 /* A function to do any final processing needed for the ELF file
1090 before writing it out. The LINKER argument is TRUE if this BFD
1091 was created by the ELF backend linker. */
1092 void (*elf_backend_final_write_processing)
1093 (bfd *, bfd_boolean linker);
1095 /* This function is called by get_program_header_size. It should
1096 return the number of additional program segments which this BFD
1097 will need. It should return -1 on error. */
1098 int (*elf_backend_additional_program_headers)
1099 (bfd *, struct bfd_link_info *);
1101 /* This function is called to modify an existing segment map in a
1102 backend specific fashion. */
1103 bfd_boolean (*elf_backend_modify_segment_map)
1104 (bfd *, struct bfd_link_info *);
1106 /* This function is called to modify program headers just before
1107 they are written. */
1108 bfd_boolean (*elf_backend_modify_program_headers)
1109 (bfd *, struct bfd_link_info *);
1111 /* This function is called before section garbage collection to
1112 mark entry symbol sections. */
1114 (struct bfd_link_info *);
1116 /* This function is called during section garbage collection to
1117 mark sections that define global symbols. */
1118 bfd_boolean (*gc_mark_dynamic_ref)
1119 (struct elf_link_hash_entry *, void *);
1121 /* This function is called during section gc to discover the section a
1122 particular relocation refers to. */
1123 elf_gc_mark_hook_fn gc_mark_hook;
1125 /* This function, if defined, is called after the first gc marking pass
1126 to allow the backend to mark additional sections. */
1127 bfd_boolean (*gc_mark_extra_sections)
1128 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1130 /* This function, if defined, is called during the sweep phase of gc
1131 in order that a backend might update any data structures it might
1133 bfd_boolean (*gc_sweep_hook)
1134 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1136 /* This function, if defined, is called after the ELF headers have
1137 been created. This allows for things like the OS and ABI versions
1139 void (*elf_backend_post_process_headers)
1140 (bfd *, struct bfd_link_info *);
1142 /* This function, if defined, prints a symbol to file and returns the
1143 name of the symbol to be printed. It should return NULL to fall
1144 back to default symbol printing. */
1145 const char *(*elf_backend_print_symbol_all)
1146 (bfd *, void *, asymbol *);
1148 /* This function, if defined, is called after all local symbols and
1149 global symbols converted to locals are emitted into the symtab
1150 section. It allows the backend to emit special local symbols
1151 not handled in the hash table. */
1152 bfd_boolean (*elf_backend_output_arch_local_syms)
1153 (bfd *, struct bfd_link_info *, void *,
1154 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1155 struct elf_link_hash_entry *));
1157 /* This function, if defined, is called after all symbols are emitted
1158 into the symtab section. It allows the backend to emit special
1159 global symbols not handled in the hash table. */
1160 bfd_boolean (*elf_backend_output_arch_syms)
1161 (bfd *, struct bfd_link_info *, void *,
1162 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1163 struct elf_link_hash_entry *));
1165 /* Copy any information related to dynamic linking from a pre-existing
1166 symbol to a newly created symbol. Also called to copy flags and
1167 other back-end info to a weakdef, in which case the symbol is not
1168 newly created and plt/got refcounts and dynamic indices should not
1170 void (*elf_backend_copy_indirect_symbol)
1171 (struct bfd_link_info *, struct elf_link_hash_entry *,
1172 struct elf_link_hash_entry *);
1174 /* Modify any information related to dynamic linking such that the
1175 symbol is not exported. */
1176 void (*elf_backend_hide_symbol)
1177 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1179 /* A function to do additional symbol fixup, called by
1180 _bfd_elf_fix_symbol_flags. */
1181 bfd_boolean (*elf_backend_fixup_symbol)
1182 (struct bfd_link_info *, struct elf_link_hash_entry *);
1184 /* Merge the backend specific symbol attribute. */
1185 void (*elf_backend_merge_symbol_attribute)
1186 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1189 /* This function, if defined, will return a string containing the
1190 name of a target-specific dynamic tag. */
1191 char *(*elf_backend_get_target_dtag)
1194 /* Decide whether an undefined symbol is special and can be ignored.
1195 This is the case for OPTIONAL symbols on IRIX. */
1196 bfd_boolean (*elf_backend_ignore_undef_symbol)
1197 (struct elf_link_hash_entry *);
1199 /* Emit relocations. Overrides default routine for emitting relocs,
1200 except during a relocatable link, or if all relocs are being emitted. */
1201 bfd_boolean (*elf_backend_emit_relocs)
1202 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1203 struct elf_link_hash_entry **);
1205 /* Count relocations. Not called for relocatable links
1206 or if all relocs are being preserved in the output. */
1207 unsigned int (*elf_backend_count_relocs)
1208 (struct bfd_link_info *, asection *);
1210 /* Count additionals relocations. Called for relocatable links if
1211 additional relocations needs to be created. */
1212 unsigned int (*elf_backend_count_additional_relocs)
1215 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1216 by r_offset. If NULL, default to true. */
1217 bfd_boolean (*sort_relocs_p)
1220 /* This function, if defined, is called when an NT_PRSTATUS note is found
1222 bfd_boolean (*elf_backend_grok_prstatus)
1223 (bfd *, Elf_Internal_Note *);
1225 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1226 note is found in a core file. */
1227 bfd_boolean (*elf_backend_grok_psinfo)
1228 (bfd *, Elf_Internal_Note *);
1230 /* This function, if defined, is called to write a note to a corefile. */
1231 char *(*elf_backend_write_core_note)
1232 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1234 /* This function, if defined, is called to convert target-specific
1235 section flag names into hex values. */
1236 flagword (*elf_backend_lookup_section_flags_hook)
1239 /* This function returns class of a reloc type. */
1240 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1241 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1243 /* This function, if defined, removes information about discarded functions
1244 from other sections which mention them. */
1245 bfd_boolean (*elf_backend_discard_info)
1246 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1248 /* This function, if defined, signals that the function above has removed
1249 the discarded relocations for this section. */
1250 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1253 /* What to do when ld finds relocations against symbols defined in
1254 discarded sections. */
1255 unsigned int (*action_discarded)
1258 /* This function returns the width of FDE pointers in bytes, or 0 if
1259 that can't be determined for some reason. The default definition
1260 goes by the bfd's EI_CLASS. */
1261 unsigned int (*elf_backend_eh_frame_address_size)
1262 (bfd *, asection *);
1264 /* These functions tell elf-eh-frame whether to attempt to turn
1265 absolute or lsda encodings into pc-relative ones. The default
1266 definition enables these transformations. */
1267 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1268 (bfd *, struct bfd_link_info *, asection *);
1269 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1270 (bfd *, struct bfd_link_info *, asection *);
1272 /* This function returns an encoding after computing the encoded
1273 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1274 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1275 The default definition chooses a 32-bit PC-relative encoding. */
1276 bfd_byte (*elf_backend_encode_eh_address)
1277 (bfd *abfd, struct bfd_link_info *info,
1278 asection *osec, bfd_vma offset,
1279 asection *loc_sec, bfd_vma loc_offset,
1282 /* This function, if defined, may write out the given section.
1283 Returns TRUE if it did so and FALSE if the caller should. */
1284 bfd_boolean (*elf_backend_write_section)
1285 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1287 /* The level of IRIX compatibility we're striving for.
1288 MIPS ELF specific function. */
1289 irix_compat_t (*elf_backend_mips_irix_compat)
1292 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1293 (unsigned int, bfd_boolean);
1295 /* The swapping table to use when dealing with ECOFF information.
1296 Used for the MIPS ELF .mdebug section. */
1297 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1299 /* This function implements `bfd_elf_bfd_from_remote_memory';
1300 see elf.c, elfcode.h. */
1301 bfd *(*elf_backend_bfd_from_remote_memory)
1302 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1303 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1304 bfd_size_type len));
1306 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1308 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1310 /* Is symbol defined in common section? */
1311 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1313 /* Return a common section index for section. */
1314 unsigned int (*common_section_index) (asection *);
1316 /* Return a common section for section. */
1317 asection *(*common_section) (asection *);
1319 /* Return TRUE if we can merge 2 definitions. */
1320 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1321 const Elf_Internal_Sym *, asection **,
1322 bfd_boolean, bfd_boolean,
1323 bfd *, const asection *);
1325 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1326 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1328 /* Return TRUE if type is a function symbol type. */
1329 bfd_boolean (*is_function_type) (unsigned int type);
1331 /* If the ELF symbol SYM might be a function in SEC, return the
1332 function size and set *CODE_OFF to the function's entry point,
1333 otherwise return zero. */
1334 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1337 /* Return the section which RELOC_SEC applies to. */
1338 asection *(*get_reloc_section) (asection *reloc_sec);
1340 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
1341 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised,
1342 FALSE otherwise. Can be called multiple times for a given section,
1343 until it returns TRUE. Most of the times it is called ISECTION will be
1344 set to an input section that might be associated with the output section.
1345 The last time that it is called, ISECTION will be set to NULL. */
1346 bfd_boolean (*elf_backend_copy_special_section_fields)
1347 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection,
1348 Elf_Internal_Shdr *osection);
1350 /* Used to handle bad SHF_LINK_ORDER input. */
1351 bfd_error_handler_type link_order_error_handler;
1353 /* Name of the PLT relocation section. */
1354 const char *relplt_name;
1356 /* Alternate EM_xxxx machine codes for this backend. */
1357 int elf_machine_alt1;
1358 int elf_machine_alt2;
1360 const struct elf_size_info *s;
1362 /* An array of target specific special sections. */
1363 const struct bfd_elf_special_section *special_sections;
1365 /* The size in bytes of the header for the GOT. This includes the
1366 so-called reserved entries on some systems. */
1367 bfd_vma got_header_size;
1369 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1370 otherwise by the local symbol with index SYMNDX in IBFD. */
1371 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1372 struct elf_link_hash_entry *h,
1373 bfd *ibfd, unsigned long symndx);
1375 /* The vendor name to use for a processor-standard attributes section. */
1376 const char *obj_attrs_vendor;
1378 /* The section name to use for a processor-standard attributes section. */
1379 const char *obj_attrs_section;
1381 /* Return 1, 2 or 3 to indicate what type of arguments a
1382 processor-specific tag takes. */
1383 int (*obj_attrs_arg_type) (int);
1385 /* The section type to use for an attributes section. */
1386 unsigned int obj_attrs_section_type;
1388 /* This function determines the order in which any attributes are
1389 written. It must be defined for input in the range
1390 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1391 is used in order to make unity easy). The returned value is the
1392 actual tag number to place in the input position. */
1393 int (*obj_attrs_order) (int);
1395 /* Handle merging unknown attributes; either warn and return TRUE,
1396 or give an error and return FALSE. */
1397 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1399 /* Parse GNU properties. Return the property kind. If the property
1400 is corrupt, issue an error message and return property_corrupt. */
1401 enum elf_property_kind (*parse_gnu_properties) (bfd *, unsigned int,
1405 /* Merge GNU properties. Return TRUE if property is updated. */
1406 bfd_boolean (*merge_gnu_properties) (bfd *, elf_property *,
1409 /* Set up GNU properties. */
1410 void (*setup_gnu_properties) (struct bfd_link_info *);
1412 /* Encoding used for compact EH tables. */
1413 int (*compact_eh_encoding) (struct bfd_link_info *);
1415 /* Opcode representing no unwind. */
1416 int (*cant_unwind_opcode) (struct bfd_link_info *);
1418 /* This is non-zero if static TLS segments require a special alignment. */
1419 unsigned static_tls_alignment;
1421 /* Alignment for the PT_GNU_STACK segment. */
1422 unsigned stack_align;
1424 /* Flag bits to assign to a section of type SHT_STRTAB. */
1425 unsigned long elf_strtab_flags;
1427 /* This is TRUE if the linker should act like collect and gather
1428 global constructors and destructors by name. This is TRUE for
1429 MIPS ELF because the Irix 5 tools can not handle the .init
1431 unsigned collect : 1;
1433 /* This is TRUE if the linker should ignore changes to the type of a
1434 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1435 record undefined functions as STT_OBJECT although the definitions
1437 unsigned type_change_ok : 1;
1439 /* Whether the backend may use REL relocations. (Some backends use
1440 both REL and RELA relocations, and this flag is set for those
1442 unsigned may_use_rel_p : 1;
1444 /* Whether the backend may use RELA relocations. (Some backends use
1445 both REL and RELA relocations, and this flag is set for those
1447 unsigned may_use_rela_p : 1;
1449 /* Whether the default relocation type is RELA. If a backend with
1450 this flag set wants REL relocations for a particular section,
1451 it must note that explicitly. Similarly, if this flag is clear,
1452 and the backend wants RELA relocations for a particular
1454 unsigned default_use_rela_p : 1;
1456 /* True if PLT and copy relocations should be RELA by default. */
1457 unsigned rela_plts_and_copies_p : 1;
1459 /* Set if RELA relocations for a relocatable link can be handled by
1460 generic code. Backends that set this flag need do nothing in the
1461 backend relocate_section routine for relocatable linking. */
1462 unsigned rela_normal : 1;
1464 /* TRUE if addresses "naturally" sign extend. This is used when
1465 swapping in from Elf32 when BFD64. */
1466 unsigned sign_extend_vma : 1;
1468 unsigned want_got_plt : 1;
1469 unsigned plt_readonly : 1;
1470 unsigned want_plt_sym : 1;
1471 unsigned plt_not_loaded : 1;
1472 unsigned plt_alignment : 4;
1473 unsigned can_gc_sections : 1;
1474 unsigned can_refcount : 1;
1475 unsigned want_got_sym : 1;
1476 unsigned want_dynbss : 1;
1478 /* Targets which do not support physical addressing often require
1479 that the p_paddr field in the section header to be set to zero.
1480 This field indicates whether this behavior is required. */
1481 unsigned want_p_paddr_set_to_zero : 1;
1483 /* True if an object file lacking a .note.GNU-stack section
1484 should be assumed to be requesting exec stack. At least one
1485 other file in the link needs to have a .note.GNU-stack section
1486 for a PT_GNU_STACK segment to be created. */
1487 unsigned default_execstack : 1;
1489 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1490 in length rather than sec->size in length, if sec->rawsize is
1491 non-zero and smaller than sec->size. */
1492 unsigned caches_rawsize : 1;
1494 /* Address of protected data defined in the shared library may be
1495 external, i.e., due to copy relocation. */
1496 unsigned extern_protected_data : 1;
1499 /* Information about reloc sections associated with a bfd_elf_section_data
1501 struct bfd_elf_section_reloc_data
1503 /* The ELF header for the reloc section associated with this
1505 Elf_Internal_Shdr *hdr;
1506 /* The number of relocations currently assigned to HDR. */
1508 /* The ELF section number of the reloc section. Only used for an
1511 /* Used by the backend linker to store the symbol hash table entries
1512 associated with relocs against global symbols. */
1513 struct elf_link_hash_entry **hashes;
1516 /* Information stored for each BFD section in an ELF file. This
1517 structure is allocated by elf_new_section_hook. */
1519 struct bfd_elf_section_data
1521 /* The ELF header for this section. */
1522 Elf_Internal_Shdr this_hdr;
1524 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1525 struct flag_info *section_flag_info;
1527 /* Information about the REL and RELA reloc sections associated
1528 with this section, if any. */
1529 struct bfd_elf_section_reloc_data rel, rela;
1531 /* The ELF section number of this section. */
1534 /* Used by the backend linker when generating a shared library to
1535 record the dynamic symbol index for a section symbol
1536 corresponding to this section. A value of 0 means that there is
1537 no dynamic symbol for this section. */
1540 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1541 asection *linked_to;
1543 /* A pointer to the swapped relocs. If the section uses REL relocs,
1544 rather than RELA, all the r_addend fields will be zero. This
1545 pointer may be NULL. It is used by the backend linker. */
1546 Elf_Internal_Rela *relocs;
1548 /* A pointer to a linked list tracking dynamic relocs copied for
1552 /* A pointer to the bfd section used for dynamic relocs. */
1556 /* Group name, if this section is a member of a group. */
1559 /* Group signature sym, if this is the SHT_GROUP section. */
1560 struct bfd_symbol *id;
1563 /* For a member of a group, points to the SHT_GROUP section.
1564 NULL for the SHT_GROUP section itself and non-group sections. */
1565 asection *sec_group;
1567 /* A linked list of member sections in the group. Circular when used by
1568 the linker. For the SHT_GROUP section, points at first member. */
1569 asection *next_in_group;
1571 /* The FDEs associated with this section. The u.fde.next_in_section
1572 field acts as a chain pointer. */
1573 struct eh_cie_fde *fde_list;
1575 /* Link from a text section to its .eh_frame_entry section. */
1576 asection *eh_frame_entry;
1578 /* A pointer used for various section optimizations. */
1582 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1583 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1584 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1585 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1586 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1587 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1588 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1589 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1590 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1591 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1593 #define xvec_get_elf_backend_data(xvec) \
1594 ((const struct elf_backend_data *) (xvec)->backend_data)
1596 #define get_elf_backend_data(abfd) \
1597 xvec_get_elf_backend_data ((abfd)->xvec)
1599 /* The least object attributes (within an attributes subsection) known
1600 for any target. Some code assumes that the value 0 is not used and
1601 the field for that attribute can instead be used as a marker to
1602 indicate that attributes have been initialized. */
1603 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1605 /* The maximum number of known object attributes for any target. */
1606 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1608 /* The value of an object attribute. The type indicates whether the attribute
1609 holds and integer, a string, or both. It can also indicate that there can
1610 be no default (i.e. all values must be written to file, even zero). */
1612 typedef struct obj_attribute
1614 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1615 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1616 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1618 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1619 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1620 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1627 typedef struct obj_attribute_list
1629 struct obj_attribute_list *next;
1632 } obj_attribute_list;
1634 /* Object attributes may either be defined by the processor ABI, index
1635 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1636 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1637 #define OBJ_ATTR_PROC 0
1638 #define OBJ_ATTR_GNU 1
1639 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1640 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1642 /* The following object attribute tags are taken as generic, for all
1643 targets and for "gnu" where there is no target standard. */
1650 Tag_compatibility = 32
1653 /* The following struct stores information about every SystemTap section
1654 found in the object file. */
1657 struct sdt_note *next;
1662 /* tdata information grabbed from an elf core file. */
1663 struct core_elf_obj_tdata
1672 /* Extra tdata information held for output ELF BFDs. */
1673 struct output_elf_obj_tdata
1675 struct elf_segment_map *seg_map;
1676 struct elf_strtab_hash *strtab_ptr;
1678 /* STT_SECTION symbols for each section */
1679 asymbol **section_syms;
1681 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1683 asection *eh_frame_hdr;
1685 /* NT_GNU_BUILD_ID note type info. */
1688 bfd_boolean (*after_write_object_contents) (bfd *);
1693 /* Records the result of `get_program_header_size'. */
1694 bfd_size_type program_header_size;
1696 /* Used when laying out sections. */
1697 file_ptr next_file_pos;
1699 int num_section_syms;
1700 unsigned int shstrtab_section, strtab_section;
1702 /* Segment flags for the PT_GNU_STACK segment. */
1703 unsigned int stack_flags;
1705 /* This is set to TRUE if the object was created by the backend
1709 /* Used to determine if the e_flags field has been initialized */
1710 bfd_boolean flags_init;
1713 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC
1714 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1715 field in the ELF header structure. */
1716 enum elf_gnu_symbols
1718 elf_gnu_symbol_none = 0,
1719 elf_gnu_symbol_any = 1 << 0,
1720 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1),
1721 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2),
1722 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique)
1725 typedef struct elf_section_list
1727 Elf_Internal_Shdr hdr;
1729 struct elf_section_list * next;
1733 /* Some private data is stashed away for future use using the tdata pointer
1734 in the bfd structure. */
1736 struct elf_obj_tdata
1738 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1739 Elf_Internal_Shdr **elf_sect_ptr;
1740 Elf_Internal_Phdr *phdr;
1741 Elf_Internal_Shdr symtab_hdr;
1742 Elf_Internal_Shdr shstrtab_hdr;
1743 Elf_Internal_Shdr strtab_hdr;
1744 Elf_Internal_Shdr dynsymtab_hdr;
1745 Elf_Internal_Shdr dynstrtab_hdr;
1746 Elf_Internal_Shdr dynversym_hdr;
1747 Elf_Internal_Shdr dynverref_hdr;
1748 Elf_Internal_Shdr dynverdef_hdr;
1749 elf_section_list * symtab_shndx_list;
1750 bfd_vma gp; /* The gp value */
1751 unsigned int gp_size; /* The gp size */
1752 unsigned int num_elf_sections; /* elf_sect_ptr size */
1754 /* A mapping from external symbols to entries in the linker hash
1755 table, used when linking. This is indexed by the symbol index
1756 minus the sh_info field of the symbol table header. */
1757 struct elf_link_hash_entry **sym_hashes;
1759 /* Track usage and final offsets of GOT entries for local symbols.
1760 This array is indexed by symbol index. Elements are used
1761 identically to "got" in struct elf_link_hash_entry. */
1764 bfd_signed_vma *refcounts;
1766 struct got_entry **ents;
1769 /* The linker ELF emulation code needs to let the backend ELF linker
1770 know what filename should be used for a dynamic object if the
1771 dynamic object is found using a search. The emulation code then
1772 sometimes needs to know what name was actually used. Until the
1773 file has been added to the linker symbol table, this field holds
1774 the name the linker wants. After it has been added, it holds the
1775 name actually used, which will be the DT_SONAME entry if there is
1777 const char *dt_name;
1779 /* The linker emulation needs to know what audit libs
1780 are used by a dynamic object. */
1781 const char *dt_audit;
1783 /* Used by find_nearest_line entry point. */
1786 /* A place to stash dwarf1 info for this bfd. */
1787 struct dwarf1_debug *dwarf1_find_line_info;
1789 /* A place to stash dwarf2 info for this bfd. */
1790 void *dwarf2_find_line_info;
1792 /* Stash away info for yet another find line/function variant. */
1793 void *elf_find_function_cache;
1795 /* Number of symbol version definitions we are about to emit. */
1796 unsigned int cverdefs;
1798 /* Number of symbol version references we are about to emit. */
1799 unsigned int cverrefs;
1801 /* Symbol version definitions in external objects. */
1802 Elf_Internal_Verdef *verdef;
1804 /* Symbol version references to external objects. */
1805 Elf_Internal_Verneed *verref;
1807 /* A pointer to the .eh_frame section. */
1808 asection *eh_frame_section;
1810 /* Symbol buffer. */
1813 /* List of GNU properties. Will be updated by setup_gnu_properties
1814 after all input GNU properties are merged for output. */
1815 elf_property_list *properties;
1817 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1818 obj_attribute_list *other_obj_attributes[2];
1820 /* Linked-list containing information about every Systemtap section
1821 found in the object file. Each section corresponds to one entry
1823 struct sdt_note *sdt_note_head;
1825 Elf_Internal_Shdr **group_sect_ptr;
1828 unsigned int symtab_section, dynsymtab_section;
1829 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1831 /* An identifier used to distinguish different target
1832 specific extensions to this structure. */
1833 enum elf_target_id object_id;
1835 /* Whether a dyanmic object was specified normally on the linker
1836 command line, or was specified when --as-needed was in effect,
1837 or was found via a DT_NEEDED entry. */
1838 enum dynamic_lib_link_class dyn_lib_class;
1840 /* Irix 5 often screws up the symbol table, sorting local symbols
1841 after global symbols. This flag is set if the symbol table in
1842 this BFD appears to be screwed up. If it is, we ignore the
1843 sh_info field in the symbol table header, and always read all the
1845 bfd_boolean bad_symtab;
1847 enum elf_gnu_symbols has_gnu_symbols;
1849 /* Information grabbed from an elf core file. */
1850 struct core_elf_obj_tdata *core;
1852 /* More information held for output ELF BFDs. */
1853 struct output_elf_obj_tdata *o;
1856 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1858 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1859 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1860 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1861 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1862 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1863 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1864 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1865 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1866 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1867 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1868 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1869 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1870 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
1871 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1872 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1873 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1874 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1875 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1876 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1877 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1878 #define elf_eh_frame_section(bfd) \
1879 (elf_tdata(bfd) -> eh_frame_section)
1880 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1881 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1882 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1883 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1884 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1885 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1886 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1887 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1888 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1889 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1890 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1891 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1892 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1893 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1894 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1895 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1896 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1897 #define elf_known_obj_attributes_proc(bfd) \
1898 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1899 #define elf_other_obj_attributes_proc(bfd) \
1900 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1901 #define elf_properties(bfd) (elf_tdata (bfd) -> properties)
1903 extern void _bfd_elf_swap_verdef_in
1904 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1905 extern void _bfd_elf_swap_verdef_out
1906 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1907 extern void _bfd_elf_swap_verdaux_in
1908 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1909 extern void _bfd_elf_swap_verdaux_out
1910 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1911 extern void _bfd_elf_swap_verneed_in
1912 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1913 extern void _bfd_elf_swap_verneed_out
1914 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1915 extern void _bfd_elf_swap_vernaux_in
1916 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1917 extern void _bfd_elf_swap_vernaux_out
1918 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1919 extern void _bfd_elf_swap_versym_in
1920 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1921 extern void _bfd_elf_swap_versym_out
1922 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1924 extern unsigned int _bfd_elf_section_from_bfd_section
1925 (bfd *, asection *);
1926 extern char *bfd_elf_string_from_elf_section
1927 (bfd *, unsigned, unsigned);
1928 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1929 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1930 Elf_External_Sym_Shndx *);
1931 extern const char *bfd_elf_sym_name
1932 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1934 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1936 extern bfd_boolean _bfd_elf_print_private_bfd_data
1938 const char * _bfd_elf_get_symbol_version_string
1939 (bfd *, asymbol *, bfd_boolean *);
1940 extern void bfd_elf_print_symbol
1941 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1943 extern unsigned int _bfd_elf_eh_frame_address_size
1944 (bfd *, asection *);
1945 extern bfd_byte _bfd_elf_encode_eh_address
1946 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1947 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1948 extern bfd_boolean _bfd_elf_can_make_relative
1949 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1951 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1952 (const struct bfd_link_info *, const asection *,
1953 const Elf_Internal_Rela *);
1954 extern bfd_vma _bfd_elf_rela_local_sym
1955 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1956 extern bfd_vma _bfd_elf_rel_local_sym
1957 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1958 extern bfd_vma _bfd_elf_section_offset
1959 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1961 extern unsigned long bfd_elf_hash
1963 extern unsigned long bfd_elf_gnu_hash
1966 extern bfd_reloc_status_type bfd_elf_generic_reloc
1967 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1968 extern bfd_boolean bfd_elf_allocate_object
1969 (bfd *, size_t, enum elf_target_id);
1970 extern bfd_boolean bfd_elf_make_object
1972 extern bfd_boolean bfd_elf_mkcorefile
1974 extern bfd_boolean _bfd_elf_make_section_from_shdr
1975 (bfd *, Elf_Internal_Shdr *, const char *, int);
1976 extern bfd_boolean _bfd_elf_make_section_from_phdr
1977 (bfd *, Elf_Internal_Phdr *, int, const char *);
1978 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1979 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1980 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1982 extern void _bfd_elf_link_hash_table_free
1984 extern void _bfd_elf_link_hash_copy_indirect
1985 (struct bfd_link_info *, struct elf_link_hash_entry *,
1986 struct elf_link_hash_entry *);
1987 extern void _bfd_elf_link_hash_hide_symbol
1988 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1989 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1990 (struct bfd_link_info *, struct elf_link_hash_entry *);
1991 extern bfd_boolean _bfd_elf_link_hash_table_init
1992 (struct elf_link_hash_table *, bfd *,
1993 struct bfd_hash_entry *(*)
1994 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1995 unsigned int, enum elf_target_id);
1996 extern bfd_boolean _bfd_elf_slurp_version_tables
1997 (bfd *, bfd_boolean);
1998 extern bfd_boolean _bfd_elf_merge_sections
1999 (bfd *, struct bfd_link_info *);
2000 extern bfd_boolean _bfd_elf_match_sections_by_type
2001 (bfd *, const asection *, bfd *, const asection *);
2002 extern bfd_boolean bfd_elf_is_group_section
2003 (bfd *, const struct bfd_section *);
2004 extern bfd_boolean _bfd_elf_section_already_linked
2005 (bfd *, asection *, struct bfd_link_info *);
2006 extern void bfd_elf_set_group_contents
2007 (bfd *, asection *, void *);
2008 extern asection *_bfd_elf_check_kept_section
2009 (asection *, struct bfd_link_info *);
2010 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
2011 extern void _bfd_elf_copy_link_hash_symbol_type
2012 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
2013 extern bfd_boolean _bfd_elf_size_group_sections
2014 (struct bfd_link_info *);
2015 extern bfd_boolean _bfd_elf_fixup_group_sections
2016 (bfd *, asection *);
2017 extern bfd_boolean _bfd_elf_copy_private_header_data
2019 extern bfd_boolean _bfd_elf_copy_private_symbol_data
2020 (bfd *, asymbol *, bfd *, asymbol *);
2021 #define _bfd_generic_init_private_section_data \
2022 _bfd_elf_init_private_section_data
2023 extern bfd_boolean _bfd_elf_init_private_section_data
2024 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
2025 extern bfd_boolean _bfd_elf_copy_private_section_data
2026 (bfd *, asection *, bfd *, asection *);
2027 extern bfd_boolean _bfd_elf_write_object_contents
2029 extern bfd_boolean _bfd_elf_write_corefile_contents
2031 extern bfd_boolean _bfd_elf_set_section_contents
2032 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
2033 extern long _bfd_elf_get_symtab_upper_bound
2035 extern long _bfd_elf_canonicalize_symtab
2036 (bfd *, asymbol **);
2037 extern long _bfd_elf_get_dynamic_symtab_upper_bound
2039 extern long _bfd_elf_canonicalize_dynamic_symtab
2040 (bfd *, asymbol **);
2041 extern long _bfd_elf_get_synthetic_symtab
2042 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
2043 extern long _bfd_elf_get_reloc_upper_bound
2045 extern long _bfd_elf_canonicalize_reloc
2046 (bfd *, sec_ptr, arelent **, asymbol **);
2047 extern asection * _bfd_elf_get_dynamic_reloc_section
2048 (bfd *, asection *, bfd_boolean);
2049 extern asection * _bfd_elf_make_dynamic_reloc_section
2050 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
2051 extern long _bfd_elf_get_dynamic_reloc_upper_bound
2053 extern long _bfd_elf_canonicalize_dynamic_reloc
2054 (bfd *, arelent **, asymbol **);
2055 extern asymbol *_bfd_elf_make_empty_symbol
2057 extern void _bfd_elf_get_symbol_info
2058 (bfd *, asymbol *, symbol_info *);
2059 extern bfd_boolean _bfd_elf_is_local_label_name
2060 (bfd *, const char *);
2061 extern alent *_bfd_elf_get_lineno
2063 extern bfd_boolean _bfd_elf_set_arch_mach
2064 (bfd *, enum bfd_architecture, unsigned long);
2065 extern bfd_boolean _bfd_elf_find_nearest_line
2066 (bfd *, asymbol **, asection *, bfd_vma,
2067 const char **, const char **, unsigned int *, unsigned int *);
2068 extern bfd_boolean _bfd_elf_find_line
2069 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
2070 extern bfd_boolean _bfd_elf_find_inliner_info
2071 (bfd *, const char **, const char **, unsigned int *);
2072 extern asymbol *_bfd_elf_find_function
2073 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
2074 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
2075 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
2076 extern int _bfd_elf_sizeof_headers
2077 (bfd *, struct bfd_link_info *);
2078 extern bfd_boolean _bfd_elf_new_section_hook
2079 (bfd *, asection *);
2080 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
2081 (const char *, const struct bfd_elf_special_section *, unsigned int);
2082 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
2083 (bfd *, asection *);
2085 /* If the target doesn't have reloc handling written yet: */
2086 extern void _bfd_elf_no_info_to_howto
2087 (bfd *, arelent *, Elf_Internal_Rela *);
2089 extern bfd_boolean bfd_section_from_shdr
2090 (bfd *, unsigned int shindex);
2091 extern bfd_boolean bfd_section_from_phdr
2092 (bfd *, Elf_Internal_Phdr *, int);
2094 extern int _bfd_elf_symbol_from_bfd_symbol
2095 (bfd *, asymbol **);
2097 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
2098 (struct sym_cache *, bfd *, unsigned long);
2099 extern asection *bfd_section_from_elf_index
2100 (bfd *, unsigned int);
2102 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2104 extern void _bfd_elf_strtab_free
2105 (struct elf_strtab_hash *);
2106 extern size_t _bfd_elf_strtab_add
2107 (struct elf_strtab_hash *, const char *, bfd_boolean);
2108 extern void _bfd_elf_strtab_addref
2109 (struct elf_strtab_hash *, size_t);
2110 extern void _bfd_elf_strtab_delref
2111 (struct elf_strtab_hash *, size_t);
2112 extern unsigned int _bfd_elf_strtab_refcount
2113 (struct elf_strtab_hash *, size_t);
2114 extern void _bfd_elf_strtab_clear_all_refs
2115 (struct elf_strtab_hash *);
2116 extern void *_bfd_elf_strtab_save
2117 (struct elf_strtab_hash *);
2118 extern void _bfd_elf_strtab_restore
2119 (struct elf_strtab_hash *, void *);
2120 extern bfd_size_type _bfd_elf_strtab_size
2121 (struct elf_strtab_hash *);
2122 extern bfd_size_type _bfd_elf_strtab_offset
2123 (struct elf_strtab_hash *, size_t);
2124 extern bfd_boolean _bfd_elf_strtab_emit
2125 (bfd *, struct elf_strtab_hash *);
2126 extern void _bfd_elf_strtab_finalize
2127 (struct elf_strtab_hash *);
2129 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2130 (bfd *, struct bfd_link_info *);
2131 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2132 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2133 extern void _bfd_elf_parse_eh_frame
2134 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2135 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2136 (struct bfd_link_info *info);
2138 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2139 (bfd *, struct bfd_link_info *, asection *,
2140 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2141 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2142 (bfd *, struct bfd_link_info *);
2143 extern bfd_vma _bfd_elf_eh_frame_section_offset
2144 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2145 extern bfd_boolean _bfd_elf_write_section_eh_frame
2146 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2147 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2148 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2149 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2150 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2151 (bfd *, struct bfd_link_info *);
2152 extern bfd_boolean _bfd_elf_eh_frame_present
2153 (struct bfd_link_info *);
2154 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2155 (struct bfd_link_info *);
2156 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2157 (struct bfd_link_info *);
2159 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2161 extern long _bfd_elf_link_lookup_local_dynindx
2162 (struct bfd_link_info *, bfd *, long);
2163 extern bfd_boolean _bfd_elf_compute_section_file_positions
2164 (bfd *, struct bfd_link_info *);
2165 extern file_ptr _bfd_elf_assign_file_position_for_section
2166 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2168 extern bfd_boolean _bfd_elf_validate_reloc
2171 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2172 (bfd *, struct bfd_link_info *);
2173 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2174 (bfd *, struct bfd_link_info *, asection *);
2175 extern bfd_boolean _bfd_elf_create_dynamic_sections
2176 (bfd *, struct bfd_link_info *);
2177 extern bfd_boolean _bfd_elf_create_got_section
2178 (bfd *, struct bfd_link_info *);
2179 extern asection *_bfd_elf_section_for_symbol
2180 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2181 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2182 (bfd *, struct bfd_link_info *, asection *, const char *);
2183 extern void _bfd_elf_init_1_index_section
2184 (bfd *, struct bfd_link_info *);
2185 extern void _bfd_elf_init_2_index_sections
2186 (bfd *, struct bfd_link_info *);
2188 extern bfd_boolean _bfd_elfcore_make_pseudosection
2189 (bfd *, char *, size_t, ufile_ptr);
2190 extern char *_bfd_elfcore_strndup
2191 (bfd *, char *, size_t);
2193 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2194 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2196 extern bfd_boolean _bfd_elf_link_output_relocs
2197 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2198 struct elf_link_hash_entry **);
2200 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2201 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2203 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2204 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2206 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2207 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2209 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2210 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2212 extern bfd_boolean _bfd_elf_setup_sections
2215 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2217 extern const bfd_target *bfd_elf32_object_p
2219 extern const bfd_target *bfd_elf32_core_file_p
2221 extern char *bfd_elf32_core_file_failing_command
2223 extern int bfd_elf32_core_file_failing_signal
2225 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2227 extern int bfd_elf32_core_file_pid
2230 extern bfd_boolean bfd_elf32_swap_symbol_in
2231 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2232 extern void bfd_elf32_swap_symbol_out
2233 (bfd *, const Elf_Internal_Sym *, void *, void *);
2234 extern void bfd_elf32_swap_reloc_in
2235 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2236 extern void bfd_elf32_swap_reloc_out
2237 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2238 extern void bfd_elf32_swap_reloca_in
2239 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2240 extern void bfd_elf32_swap_reloca_out
2241 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2242 extern void bfd_elf32_swap_phdr_in
2243 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2244 extern void bfd_elf32_swap_phdr_out
2245 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2246 extern void bfd_elf32_swap_dyn_in
2247 (bfd *, const void *, Elf_Internal_Dyn *);
2248 extern void bfd_elf32_swap_dyn_out
2249 (bfd *, const Elf_Internal_Dyn *, void *);
2250 extern long bfd_elf32_slurp_symbol_table
2251 (bfd *, asymbol **, bfd_boolean);
2252 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2254 extern int bfd_elf32_write_out_phdrs
2255 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2256 extern bfd_boolean bfd_elf32_checksum_contents
2257 (bfd * , void (*) (const void *, size_t, void *), void *);
2258 extern void bfd_elf32_write_relocs
2259 (bfd *, asection *, void *);
2260 extern bfd_boolean bfd_elf32_slurp_reloc_table
2261 (bfd *, asection *, asymbol **, bfd_boolean);
2263 extern const bfd_target *bfd_elf64_object_p
2265 extern const bfd_target *bfd_elf64_core_file_p
2267 extern char *bfd_elf64_core_file_failing_command
2269 extern int bfd_elf64_core_file_failing_signal
2271 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2273 extern int bfd_elf64_core_file_pid
2276 extern bfd_boolean bfd_elf64_swap_symbol_in
2277 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2278 extern void bfd_elf64_swap_symbol_out
2279 (bfd *, const Elf_Internal_Sym *, void *, void *);
2280 extern void bfd_elf64_swap_reloc_in
2281 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2282 extern void bfd_elf64_swap_reloc_out
2283 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2284 extern void bfd_elf64_swap_reloca_in
2285 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2286 extern void bfd_elf64_swap_reloca_out
2287 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2288 extern void bfd_elf64_swap_phdr_in
2289 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2290 extern void bfd_elf64_swap_phdr_out
2291 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2292 extern void bfd_elf64_swap_dyn_in
2293 (bfd *, const void *, Elf_Internal_Dyn *);
2294 extern void bfd_elf64_swap_dyn_out
2295 (bfd *, const Elf_Internal_Dyn *, void *);
2296 extern long bfd_elf64_slurp_symbol_table
2297 (bfd *, asymbol **, bfd_boolean);
2298 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2300 extern int bfd_elf64_write_out_phdrs
2301 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2302 extern bfd_boolean bfd_elf64_checksum_contents
2303 (bfd * , void (*) (const void *, size_t, void *), void *);
2304 extern void bfd_elf64_write_relocs
2305 (bfd *, asection *, void *);
2306 extern bfd_boolean bfd_elf64_slurp_reloc_table
2307 (bfd *, asection *, asymbol **, bfd_boolean);
2309 extern bfd_boolean _bfd_elf_default_relocs_compatible
2310 (const bfd_target *, const bfd_target *);
2312 extern bfd_boolean _bfd_elf_relocs_compatible
2313 (const bfd_target *, const bfd_target *);
2314 extern bfd_boolean _bfd_elf_notice_as_needed
2315 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2317 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2318 (bfd *, struct bfd_link_info *, const char *);
2319 extern bfd_boolean bfd_elf_link_add_symbols
2320 (bfd *, struct bfd_link_info *);
2321 extern bfd_boolean _bfd_elf_add_dynamic_entry
2322 (struct bfd_link_info *, bfd_vma, bfd_vma);
2323 extern bfd_boolean _bfd_elf_link_check_relocs
2324 (bfd *, struct bfd_link_info *);
2326 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2327 (struct bfd_link_info *, struct elf_link_hash_entry *);
2329 extern int bfd_elf_link_record_local_dynamic_symbol
2330 (struct bfd_link_info *, bfd *, long);
2332 extern bfd_boolean _bfd_elf_close_and_cleanup
2335 extern bfd_boolean _bfd_elf_common_definition
2336 (Elf_Internal_Sym *);
2338 extern unsigned int _bfd_elf_common_section_index
2341 extern asection *_bfd_elf_common_section
2344 extern bfd_vma _bfd_elf_default_got_elt_size
2345 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2348 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2349 (bfd *, arelent *, struct bfd_symbol *, void *,
2350 asection *, bfd *, char **);
2352 extern bfd_boolean bfd_elf_final_link
2353 (bfd *, struct bfd_link_info *);
2355 extern void _bfd_elf_gc_keep
2356 (struct bfd_link_info *info);
2358 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2359 (struct elf_link_hash_entry *h, void *inf);
2361 extern bfd_boolean bfd_elf_gc_sections
2362 (bfd *, struct bfd_link_info *);
2364 extern bfd_boolean bfd_elf_gc_record_vtinherit
2365 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2367 extern bfd_boolean bfd_elf_gc_record_vtentry
2368 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2370 extern asection *_bfd_elf_gc_mark_hook
2371 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2372 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2374 extern asection *_bfd_elf_gc_mark_rsec
2375 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2376 struct elf_reloc_cookie *, bfd_boolean *);
2378 extern bfd_boolean _bfd_elf_gc_mark_reloc
2379 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2380 struct elf_reloc_cookie *);
2382 extern bfd_boolean _bfd_elf_gc_mark_fdes
2383 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2384 struct elf_reloc_cookie *);
2386 extern bfd_boolean _bfd_elf_gc_mark
2387 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2389 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2390 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2392 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2393 (bfd *, struct bfd_link_info *);
2395 extern bfd_boolean bfd_elf_gc_common_final_link
2396 (bfd *, struct bfd_link_info *);
2398 extern asection *_bfd_elf_is_start_stop
2399 (const struct bfd_link_info *, struct elf_link_hash_entry *);
2401 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2404 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2405 (bfd *, asection *);
2407 extern bfd_boolean _bfd_elf_map_sections_to_segments
2408 (bfd *, struct bfd_link_info *);
2410 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2412 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2415 extern asection *_bfd_elf_get_reloc_section (asection *);
2417 extern int bfd_elf_get_default_section_type (flagword);
2419 extern bfd_boolean bfd_elf_lookup_section_flags
2420 (struct bfd_link_info *, struct flag_info *, asection *);
2422 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2423 (bfd * abfd, asection * section);
2425 /* PowerPC @tls opcode transform/validate. */
2426 extern unsigned int _bfd_elf_ppc_at_tls_transform
2427 (unsigned int, unsigned int);
2428 /* PowerPC @tprel opcode transform/validate. */
2429 extern unsigned int _bfd_elf_ppc_at_tprel_transform
2430 (unsigned int, unsigned int);
2431 /* PowerPC elf_object_p tweak. */
2432 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *);
2434 /* Exported interface for writing elf corefile notes. */
2435 extern char *elfcore_write_note
2436 (bfd *, char *, int *, const char *, int, const void *, int);
2437 extern char *elfcore_write_prpsinfo
2438 (bfd *, char *, int *, const char *, const char *);
2439 extern char *elfcore_write_prstatus
2440 (bfd *, char *, int *, long, int, const void *);
2441 extern char * elfcore_write_pstatus
2442 (bfd *, char *, int *, long, int, const void *);
2443 extern char *elfcore_write_prfpreg
2444 (bfd *, char *, int *, const void *, int);
2445 extern char *elfcore_write_prxfpreg
2446 (bfd *, char *, int *, const void *, int);
2447 extern char *elfcore_write_xstatereg
2448 (bfd *, char *, int *, const void *, int);
2449 extern char *elfcore_write_ppc_vmx
2450 (bfd *, char *, int *, const void *, int);
2451 extern char *elfcore_write_ppc_vsx
2452 (bfd *, char *, int *, const void *, int);
2453 extern char *elfcore_write_s390_timer
2454 (bfd *, char *, int *, const void *, int);
2455 extern char *elfcore_write_s390_todcmp
2456 (bfd *, char *, int *, const void *, int);
2457 extern char *elfcore_write_s390_todpreg
2458 (bfd *, char *, int *, const void *, int);
2459 extern char *elfcore_write_s390_ctrs
2460 (bfd *, char *, int *, const void *, int);
2461 extern char *elfcore_write_s390_prefix
2462 (bfd *, char *, int *, const void *, int);
2463 extern char *elfcore_write_s390_last_break
2464 (bfd *, char *, int *, const void *, int);
2465 extern char *elfcore_write_s390_system_call
2466 (bfd *, char *, int *, const void *, int);
2467 extern char *elfcore_write_s390_tdb
2468 (bfd *, char *, int *, const void *, int);
2469 extern char *elfcore_write_s390_vxrs_low
2470 (bfd *, char *, int *, const void *, int);
2471 extern char *elfcore_write_s390_vxrs_high
2472 (bfd *, char *, int *, const void *, int);
2473 extern char *elfcore_write_arm_vfp
2474 (bfd *, char *, int *, const void *, int);
2475 extern char *elfcore_write_aarch_tls
2476 (bfd *, char *, int *, const void *, int);
2477 extern char *elfcore_write_aarch_hw_break
2478 (bfd *, char *, int *, const void *, int);
2479 extern char *elfcore_write_aarch_hw_watch
2480 (bfd *, char *, int *, const void *, int);
2481 extern char *elfcore_write_lwpstatus
2482 (bfd *, char *, int *, long, int, const void *);
2483 extern char *elfcore_write_register_note
2484 (bfd *, char *, int *, const char *, const void *, int);
2486 /* Internal structure which holds information to be included in the
2487 PRPSINFO section of Linux core files.
2489 This is an "internal" structure in the sense that it should be used
2490 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2491 function), so things like endianess shouldn't be an issue. This
2492 structure will eventually be converted in one of the
2493 `elf_external_linux_*' structures and written out to an output bfd
2494 by one of the functions declared below. */
2496 struct elf_internal_linux_prpsinfo
2498 char pr_state; /* Numeric process state. */
2499 char pr_sname; /* Char for pr_state. */
2500 char pr_zomb; /* Zombie. */
2501 char pr_nice; /* Nice val. */
2502 unsigned long pr_flag; /* Flags. */
2503 unsigned int pr_uid;
2504 unsigned int pr_gid;
2505 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2506 char pr_fname[16 + 1]; /* Filename of executable. */
2507 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2510 /* Linux/most 32-bit archs. */
2511 extern char *elfcore_write_linux_prpsinfo32
2512 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2514 /* Linux/most 64-bit archs. */
2515 extern char *elfcore_write_linux_prpsinfo64
2516 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2518 /* Linux/PPC32 uses different layout compared to most archs. */
2519 extern char *elfcore_write_ppc_linux_prpsinfo32
2520 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2522 extern bfd *_bfd_elf32_bfd_from_remote_memory
2523 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2524 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2525 extern bfd *_bfd_elf64_bfd_from_remote_memory
2526 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2527 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2529 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2530 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2531 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2532 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2533 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2534 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2535 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2536 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2537 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2538 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2539 unsigned int, const char *);
2540 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2541 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2544 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2545 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2546 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2547 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2548 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2549 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2550 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2551 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2553 extern bfd_boolean _bfd_elf_parse_gnu_properties
2554 (bfd *, Elf_Internal_Note *);
2555 extern elf_property * _bfd_elf_get_property
2556 (bfd *, unsigned int, unsigned int);
2557 extern void _bfd_elf_link_setup_gnu_properties
2558 (struct bfd_link_info *);
2560 /* The linker may need to keep track of the number of relocs that it
2561 decides to copy as dynamic relocs in check_relocs for each symbol.
2562 This is so that it can later discard them if they are found to be
2563 unnecessary. We can store the information in a field extending the
2564 regular ELF linker hash table. */
2566 struct elf_dyn_relocs
2568 struct elf_dyn_relocs *next;
2570 /* The input section of the reloc. */
2573 /* Total number of relocs copied for the input section. */
2574 bfd_size_type count;
2576 /* Number of pc-relative relocs copied for the input section. */
2577 bfd_size_type pc_count;
2580 extern bfd_boolean _bfd_elf_create_ifunc_sections
2581 (bfd *, struct bfd_link_info *);
2582 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2583 (struct bfd_link_info *, struct elf_link_hash_entry *,
2584 struct elf_dyn_relocs **, bfd_boolean *, unsigned int,
2585 unsigned int, unsigned int, bfd_boolean);
2586 extern long _bfd_elf_ifunc_get_synthetic_symtab
2587 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
2588 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
2590 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2591 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2593 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2594 extern bfd_vma elf64_r_sym (bfd_vma);
2595 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2596 extern bfd_vma elf32_r_sym (bfd_vma);
2598 /* Large common section. */
2599 extern asection _bfd_elf_large_com_section;
2601 /* Hash for local symbol with the first section id, ID, in the input
2602 file and the local symbol index, SYM. */
2603 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2604 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2605 ^ (SYM) ^ ((ID) >> 16))
2607 /* This is the condition under which finish_dynamic_symbol will be called.
2608 If our finish_dynamic_symbol isn't called, we'll need to do something
2609 about initializing any .plt and .got entries in relocate_section. */
2610 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2612 && ((SHARED) || !(H)->forced_local) \
2613 && ((H)->dynindx != -1 || (H)->forced_local))
2615 /* This macro is to avoid lots of duplicated code in the body
2616 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2617 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2618 r_symndx, symtab_hdr, sym_hashes, \
2619 h, sec, relocation, \
2620 unresolved_reloc, warned, ignored) \
2623 /* It seems this can happen with erroneous or unsupported \
2624 input (mixing a.out and elf in an archive, for example.) */ \
2625 if (sym_hashes == NULL) \
2628 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2630 if (info->wrap_hash != NULL \
2631 && (input_section->flags & SEC_DEBUGGING) != 0) \
2632 h = ((struct elf_link_hash_entry *) \
2633 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2635 while (h->root.type == bfd_link_hash_indirect \
2636 || h->root.type == bfd_link_hash_warning) \
2637 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2641 unresolved_reloc = FALSE; \
2643 if (h->root.type == bfd_link_hash_defined \
2644 || h->root.type == bfd_link_hash_defweak) \
2646 sec = h->root.u.def.section; \
2648 || sec->output_section == NULL) \
2649 /* Set a flag that will be cleared later if we find a \
2650 relocation value for this symbol. output_section \
2651 is typically NULL for symbols satisfied by a shared \
2653 unresolved_reloc = TRUE; \
2655 relocation = (h->root.u.def.value \
2656 + sec->output_section->vma \
2657 + sec->output_offset); \
2659 else if (h->root.type == bfd_link_hash_undefweak) \
2661 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2662 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2664 else if (!bfd_link_relocatable (info)) \
2667 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2668 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2669 (*info->callbacks->undefined_symbol) (info, \
2670 h->root.root.string, \
2673 rel->r_offset, err); \
2676 (void) unresolved_reloc; \
2682 /* This macro is to avoid lots of duplicated code in the body of the
2683 loop over relocations in xxx_relocate_section() in the various
2686 Handle relocations against symbols from removed linkonce sections,
2687 or sections discarded by a linker script. When doing a relocatable
2688 link, we remove such relocations. Otherwise, we just want the
2689 section contents zeroed and avoid any special processing. */
2690 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2691 rel, count, relend, \
2692 howto, index, contents) \
2695 _bfd_clear_contents (howto, input_bfd, input_section, \
2696 contents + rel[index].r_offset); \
2698 if (bfd_link_relocatable (info) \
2699 && (input_section->flags & SEC_DEBUGGING)) \
2701 /* Only remove relocations in debug sections since other \
2702 sections may require relocations. */ \
2703 Elf_Internal_Shdr *rel_hdr; \
2705 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2707 /* Avoid empty output section. */ \
2708 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2710 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2711 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2712 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2714 memmove (rel, rel + count, \
2715 (relend - rel - count) * sizeof (*rel)); \
2717 input_section->reloc_count--; \
2724 for (i_ = 0; i_ < count; i_++) \
2726 rel[i_].r_info = 0; \
2727 rel[i_].r_addend = 0; \
2733 /* Will a symbol be bound to the definition within the shared
2734 library, if any. A unique symbol can never be bound locally. */
2735 #define SYMBOLIC_BIND(INFO, H) \
2736 (!(H)->unique_global \
2737 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2742 #endif /* _LIBELF_H_ */