1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2017 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,
485 struct elf_sym_strtab
487 Elf_Internal_Sym sym;
488 unsigned long dest_index;
489 unsigned long destshndx_index;
492 /* ELF linker hash table. */
494 struct elf_link_hash_table
496 struct bfd_link_hash_table root;
498 /* An identifier used to distinguish different target
499 specific extensions to this structure. */
500 enum elf_target_id hash_table_id;
502 /* Whether we have created the special dynamic sections required
503 when linking against or generating a shared object. */
504 bfd_boolean dynamic_sections_created;
506 /* True if this target has relocatable executables, so needs dynamic
508 bfd_boolean is_relocatable_executable;
510 /* The BFD used to hold special sections created by the linker.
511 This will be the first BFD found which requires these sections to
515 /* The value to use when initialising got.refcount/offset and
516 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
517 the values are refcounts. Set to init_got_offset/init_plt_offset
518 in size_dynamic_sections when the values may be offsets. */
519 union gotplt_union init_got_refcount;
520 union gotplt_union init_plt_refcount;
522 /* The value to use for got.refcount/offset and plt.refcount/offset
523 when the values may be offsets. Normally (bfd_vma) -1. */
524 union gotplt_union init_got_offset;
525 union gotplt_union init_plt_offset;
527 /* The number of symbols found in the link which is intended for the
528 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */
529 bfd_size_type dynsymcount;
530 bfd_size_type local_dynsymcount;
532 /* The string table of dynamic symbols, which becomes the .dynstr
534 struct elf_strtab_hash *dynstr;
536 /* The number of symbol strings found in the link which must be put
537 into the .strtab section. */
538 bfd_size_type strtabcount;
540 /* The array size of the symbol string table, which becomes the
542 bfd_size_type strtabsize;
544 /* The array of strings, which becomes the .strtab section. */
545 struct elf_sym_strtab *strtab;
547 /* The number of buckets in the hash table in the .hash section.
548 This is based on the number of dynamic symbols. */
549 bfd_size_type bucketcount;
551 /* A linked list of DT_NEEDED names found in dynamic objects
552 included in the link. */
553 struct bfd_link_needed_list *needed;
555 /* Sections in the output bfd that provides a section symbol
556 to be used by relocations emitted against local symbols.
557 Most targets will not use data_index_section. */
558 asection *text_index_section;
559 asection *data_index_section;
561 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
562 struct elf_link_hash_entry *hgot;
564 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
565 struct elf_link_hash_entry *hplt;
567 /* The _DYNAMIC symbol. */
568 struct elf_link_hash_entry *hdynamic;
570 /* A pointer to information used to merge SEC_MERGE sections. */
573 /* Used to link stabs in sections. */
574 struct stab_info stab_info;
576 /* Used by eh_frame code when editing .eh_frame. */
577 struct eh_frame_hdr_info eh_info;
579 /* A linked list of local symbols to be added to .dynsym. */
580 struct elf_link_local_dynamic_entry *dynlocal;
582 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
583 objects included in the link. */
584 struct bfd_link_needed_list *runpath;
586 /* Cached first output tls section and size of PT_TLS segment. */
588 bfd_size_type tls_size;
590 /* A linked list of BFD's loaded in the link. */
591 struct elf_link_loaded_list *loaded;
593 /* Short-cuts to get to dynamic linker sections. */
602 asection *sreldynrelro;
610 /* Look up an entry in an ELF linker hash table. */
612 #define elf_link_hash_lookup(table, string, create, copy, follow) \
613 ((struct elf_link_hash_entry *) \
614 bfd_link_hash_lookup (&(table)->root, (string), (create), \
617 /* Traverse an ELF linker hash table. */
619 #define elf_link_hash_traverse(table, func, info) \
620 (bfd_link_hash_traverse \
622 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
625 /* Get the ELF linker hash table from a link_info structure. */
627 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
629 #define elf_hash_table_id(table) ((table) -> hash_table_id)
631 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
632 #define is_elf_hash_table(htab) \
633 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
635 /* Used by bfd_sym_from_r_symndx to cache a small number of local
637 #define LOCAL_SYM_CACHE_SIZE 32
641 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
642 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
645 /* Constant information held for an ELF backend. */
647 struct elf_size_info {
648 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
649 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
651 /* The size of entries in the .hash section. */
652 unsigned char sizeof_hash_entry;
654 /* The number of internal relocations to allocate per external
656 unsigned char int_rels_per_ext_rel;
657 /* We use some fixed size arrays. This should be large enough to
658 handle all back-ends. */
659 #define MAX_INT_RELS_PER_EXT_REL 3
661 unsigned char arch_size, log_file_align;
662 unsigned char elfclass, ev_current;
663 int (*write_out_phdrs)
664 (bfd *, const Elf_Internal_Phdr *, unsigned int);
666 (*write_shdrs_and_ehdr) (bfd *);
667 bfd_boolean (*checksum_contents)
668 (bfd * , void (*) (const void *, size_t, void *), void *);
670 (bfd *, asection *, void *);
671 bfd_boolean (*swap_symbol_in)
672 (bfd *, const void *, const void *, Elf_Internal_Sym *);
673 void (*swap_symbol_out)
674 (bfd *, const Elf_Internal_Sym *, void *, void *);
675 bfd_boolean (*slurp_reloc_table)
676 (bfd *, asection *, asymbol **, bfd_boolean);
677 long (*slurp_symbol_table)
678 (bfd *, asymbol **, bfd_boolean);
680 (bfd *, const void *, Elf_Internal_Dyn *);
682 (bfd *, const Elf_Internal_Dyn *, void *);
684 /* This function is called to swap in a REL relocation. If an
685 external relocation corresponds to more than one internal
686 relocation, then all relocations are swapped in at once. */
687 void (*swap_reloc_in)
688 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
690 /* This function is called to swap out a REL relocation. */
691 void (*swap_reloc_out)
692 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
694 /* This function is called to swap in a RELA relocation. If an
695 external relocation corresponds to more than one internal
696 relocation, then all relocations are swapped in at once. */
697 void (*swap_reloca_in)
698 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
700 /* This function is called to swap out a RELA relocation. */
701 void (*swap_reloca_out)
702 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
705 #define elf_symbol_from(ABFD,S) \
706 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
707 && (S)->the_bfd->tdata.elf_obj_data != 0) \
708 ? (elf_symbol_type *) (S) \
711 enum elf_reloc_type_class {
713 reloc_class_relative,
719 struct elf_reloc_cookie
721 Elf_Internal_Rela *rels, *rel, *relend;
722 Elf_Internal_Sym *locsyms;
726 struct elf_link_hash_entry **sym_hashes;
728 bfd_boolean bad_symtab;
731 /* The level of IRIX compatibility we're striving for. */
739 /* Mapping of ELF section names and types. */
740 struct bfd_elf_special_section
743 unsigned int prefix_length;
744 /* 0 means name must match PREFIX exactly.
745 -1 means name must start with PREFIX followed by an arbitrary string.
746 -2 means name must match PREFIX exactly or consist of PREFIX followed
747 by a dot then anything.
748 > 0 means name must start with the first PREFIX_LENGTH chars of
749 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
750 signed int suffix_length;
755 enum action_discarded
761 typedef asection * (*elf_gc_mark_hook_fn)
762 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
763 struct elf_link_hash_entry *, Elf_Internal_Sym *);
765 struct bfd_elf_section_reloc_data;
767 struct elf_backend_data
769 /* The architecture for this backend. */
770 enum bfd_architecture arch;
772 /* An identifier used to distinguish different target specific
773 extensions to elf_obj_tdata and elf_link_hash_table structures. */
774 enum elf_target_id target_id;
776 /* The ELF machine code (EM_xxxx) for this backend. */
777 int elf_machine_code;
782 /* The maximum page size for this backend. */
785 /* The minimum page size for this backend. An input object will not be
786 considered page aligned unless its sections are correctly aligned for
787 pages at least this large. May be smaller than maxpagesize. */
790 /* The common page size for this backend. */
791 bfd_vma commonpagesize;
793 /* The BFD flags applied to sections created for dynamic linking. */
794 flagword dynamic_sec_flags;
796 /* Architecture-specific data for this backend.
797 This is actually a pointer to some type like struct elf_ARCH_data. */
798 const void *arch_data;
800 /* A function to translate an ELF RELA relocation to a BFD arelent
802 void (*elf_info_to_howto)
803 (bfd *, arelent *, Elf_Internal_Rela *);
805 /* A function to translate an ELF REL relocation to a BFD arelent
807 void (*elf_info_to_howto_rel)
808 (bfd *, arelent *, Elf_Internal_Rela *);
810 /* A function to determine whether a symbol is global when
811 partitioning the symbol table into local and global symbols.
812 This should be NULL for most targets, in which case the correct
813 thing will be done. MIPS ELF, at least on the Irix 5, has
814 special requirements. */
815 bfd_boolean (*elf_backend_sym_is_global)
818 /* The remaining functions are hooks which are called only if they
821 /* A function to permit a backend specific check on whether a
822 particular BFD format is relevant for an object file, and to
823 permit the backend to set any global information it wishes. When
824 this is called elf_elfheader is set, but anything else should be
825 used with caution. If this returns FALSE, the check_format
826 routine will return a bfd_error_wrong_format error. */
827 bfd_boolean (*elf_backend_object_p)
830 /* A function to do additional symbol processing when reading the
831 ELF symbol table. This is where any processor-specific special
832 section indices are handled. */
833 void (*elf_backend_symbol_processing)
836 /* A function to do additional symbol processing after reading the
837 entire ELF symbol table. */
838 bfd_boolean (*elf_backend_symbol_table_processing)
839 (bfd *, elf_symbol_type *, unsigned int);
841 /* A function to set the type of the info field. Processor-specific
842 types should be handled here. */
843 int (*elf_backend_get_symbol_type)
844 (Elf_Internal_Sym *, int);
846 /* A function to return the linker hash table entry of a symbol that
847 might be satisfied by an archive symbol. */
848 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
849 (bfd *, struct bfd_link_info *, const char *);
851 /* Return true if local section symbols should have a non-null st_name.
852 NULL implies false. */
853 bfd_boolean (*elf_backend_name_local_section_symbols)
856 /* A function to do additional processing on the ELF section header
857 just before writing it out. This is used to set the flags and
858 type fields for some sections, or to actually write out data for
860 bfd_boolean (*elf_backend_section_processing)
861 (bfd *, Elf_Internal_Shdr *);
863 /* A function to handle unusual section types when creating BFD
864 sections from ELF sections. */
865 bfd_boolean (*elf_backend_section_from_shdr)
866 (bfd *, Elf_Internal_Shdr *, const char *, int);
868 /* A function to convert machine dependent ELF section header flags to
869 BFD internal section header flags. */
870 bfd_boolean (*elf_backend_section_flags)
871 (flagword *, const Elf_Internal_Shdr *);
873 /* A function that returns a struct containing ELF section flags and
874 type for the given BFD section. */
875 const struct bfd_elf_special_section * (*get_sec_type_attr)
878 /* A function to handle unusual program segment types when creating BFD
879 sections from ELF program segments. */
880 bfd_boolean (*elf_backend_section_from_phdr)
881 (bfd *, Elf_Internal_Phdr *, int, const char *);
883 /* A function to set up the ELF section header for a BFD section in
884 preparation for writing it out. This is where the flags and type
885 fields are set for unusual sections. */
886 bfd_boolean (*elf_backend_fake_sections)
887 (bfd *, Elf_Internal_Shdr *, asection *);
889 /* A function to get the ELF section index for a BFD section. If
890 this returns TRUE, the section was found. If it is a normal ELF
891 section, *RETVAL should be left unchanged. If it is not a normal
892 ELF section *RETVAL should be set to the SHN_xxxx index. */
893 bfd_boolean (*elf_backend_section_from_bfd_section)
894 (bfd *, asection *, int *retval);
896 /* If this field is not NULL, it is called by the add_symbols phase
897 of a link just before adding a symbol to the global linker hash
898 table. It may modify any of the fields as it wishes. If *NAME
899 is set to NULL, the symbol will be skipped rather than being
900 added to the hash table. This function is responsible for
901 handling all processor dependent symbol bindings and section
902 indices, and must set at least *FLAGS and *SEC for each processor
903 dependent case; failure to do so will cause a link error. */
904 bfd_boolean (*elf_add_symbol_hook)
905 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
906 const char **name, flagword *flags, asection **sec, bfd_vma *value);
908 /* If this field is not NULL, it is called by the elf_link_output_sym
909 phase of a link for each symbol which will appear in the object file.
910 On error, this function returns 0. 1 is returned when the symbol
911 should be output, 2 is returned when the symbol should be discarded. */
912 int (*elf_backend_link_output_symbol_hook)
913 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
914 asection *, struct elf_link_hash_entry *);
916 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
917 linker the first time it encounters a dynamic object in the link.
918 This function must create any sections required for dynamic
919 linking. The ABFD argument is a dynamic object. The .interp,
920 .dynamic, .dynsym, .dynstr, and .hash functions have already been
921 created, and this function may modify the section flags if
922 desired. This function will normally create the .got and .plt
923 sections, but different backends have different requirements. */
924 bfd_boolean (*elf_backend_create_dynamic_sections)
925 (bfd *abfd, struct bfd_link_info *info);
927 /* When creating a shared library, determine whether to omit the
928 dynamic symbol for the section. */
929 bfd_boolean (*elf_backend_omit_section_dynsym)
930 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
932 /* Return TRUE if relocations of targets are compatible to the extent
933 that CHECK_RELOCS will properly process them. PR 4424. */
934 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
936 /* The CHECK_RELOCS function is called by the add_symbols phase of
937 the ELF backend linker. It is called once for each section with
938 relocs of an object file, just after the symbols for the object
939 file have been added to the global linker hash table. The
940 function must look through the relocs and do any special handling
941 required. This generally means allocating space in the global
942 offset table, and perhaps allocating space for a reloc. The
943 relocs are always passed as Rela structures; if the section
944 actually uses Rel structures, the r_addend field will always be
946 bfd_boolean (*check_relocs)
947 (bfd *abfd, struct bfd_link_info *info, asection *o,
948 const Elf_Internal_Rela *relocs);
950 /* The CHECK_DIRECTIVES function is called once per input file by
951 the add_symbols phase of the ELF backend linker. The function
952 must inspect the bfd and create any additional symbols according
953 to any custom directives in the bfd. */
954 bfd_boolean (*check_directives)
955 (bfd *abfd, struct bfd_link_info *info);
957 /* The NOTICE_AS_NEEDED function is called as the linker is about to
958 handle an as-needed lib (ACT = notice_as_needed), and after the
959 linker has decided to keep the lib (ACT = notice_needed) or when
960 the lib is not needed (ACT = notice_not_needed). */
961 bfd_boolean (*notice_as_needed)
962 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
964 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
965 linker for every symbol which is defined by a dynamic object and
966 referenced by a regular object. This is called after all the
967 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
968 function has been called. The hash table entry should be
969 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
970 defined in a section from a dynamic object. Dynamic object
971 sections are not included in the final link, and this function is
972 responsible for changing the value to something which the rest of
973 the link can deal with. This will normally involve adding an
974 entry to the .plt or .got or some such section, and setting the
975 symbol to point to that. */
976 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
977 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
979 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
980 after all the linker input files have been seen but before the
981 section sizes have been set. This is called after
982 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
983 bfd_boolean (*elf_backend_always_size_sections)
984 (bfd *output_bfd, struct bfd_link_info *info);
986 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
987 linker after all the linker input files have been seen but before
988 the sections sizes have been set. This is called after
989 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
990 It is only called when linking against a dynamic object. It must
991 set the sizes of the dynamic sections, and may fill in their
992 contents as well. The generic ELF linker can handle the .dynsym,
993 .dynstr and .hash sections. This function must handle the
994 .interp section and any sections created by the
995 CREATE_DYNAMIC_SECTIONS entry point. */
996 bfd_boolean (*elf_backend_size_dynamic_sections)
997 (bfd *output_bfd, struct bfd_link_info *info);
999 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
1000 we keep to use as a base for relocs and symbols. */
1001 void (*elf_backend_init_index_section)
1002 (bfd *output_bfd, struct bfd_link_info *info);
1004 /* The RELOCATE_SECTION function is called by the ELF backend linker
1005 to handle the relocations for a section.
1007 The relocs are always passed as Rela structures; if the section
1008 actually uses Rel structures, the r_addend field will always be
1011 This function is responsible for adjust the section contents as
1012 necessary, and (if using Rela relocs and generating a
1013 relocatable output file) adjusting the reloc addend as
1016 This function does not have to worry about setting the reloc
1017 address or the reloc symbol index.
1019 LOCAL_SYMS is a pointer to the swapped in local symbols.
1021 LOCAL_SECTIONS is an array giving the section in the input file
1022 corresponding to the st_shndx field of each local symbol.
1024 The global hash table entry for the global symbols can be found
1025 via elf_sym_hashes (input_bfd).
1027 When generating relocatable output, this function must handle
1028 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1029 going to be the section symbol corresponding to the output
1030 section, which means that the addend must be adjusted
1033 Returns FALSE on error, TRUE on success, 2 if successful and
1034 relocations should be written for this section. */
1035 int (*elf_backend_relocate_section)
1036 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1037 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1038 Elf_Internal_Sym *local_syms, asection **local_sections);
1040 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1041 linker just before it writes a symbol out to the .dynsym section.
1042 The processor backend may make any required adjustment to the
1043 symbol. It may also take the opportunity to set contents of the
1044 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1045 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1046 on those symbols which are defined by a dynamic object. */
1047 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1048 (bfd *output_bfd, struct bfd_link_info *info,
1049 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1051 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1052 linker just before it writes all the dynamic sections out to the
1053 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1054 all dynamic symbols. */
1055 bfd_boolean (*elf_backend_finish_dynamic_sections)
1056 (bfd *output_bfd, struct bfd_link_info *info);
1058 /* A function to do any beginning processing needed for the ELF file
1059 before building the ELF headers and computing file positions. */
1060 void (*elf_backend_begin_write_processing)
1061 (bfd *, struct bfd_link_info *);
1063 /* A function to do any final processing needed for the ELF file
1064 before writing it out. The LINKER argument is TRUE if this BFD
1065 was created by the ELF backend linker. */
1066 void (*elf_backend_final_write_processing)
1067 (bfd *, bfd_boolean linker);
1069 /* This function is called by get_program_header_size. It should
1070 return the number of additional program segments which this BFD
1071 will need. It should return -1 on error. */
1072 int (*elf_backend_additional_program_headers)
1073 (bfd *, struct bfd_link_info *);
1075 /* This function is called to modify an existing segment map in a
1076 backend specific fashion. */
1077 bfd_boolean (*elf_backend_modify_segment_map)
1078 (bfd *, struct bfd_link_info *);
1080 /* This function is called to modify program headers just before
1081 they are written. */
1082 bfd_boolean (*elf_backend_modify_program_headers)
1083 (bfd *, struct bfd_link_info *);
1085 /* This function is called to see if the PHDR header should be
1086 checked for validity. */
1087 bfd_boolean (*elf_backend_allow_non_load_phdr)
1088 (bfd *, const Elf_Internal_Phdr *, unsigned);
1090 /* This function is called before section garbage collection to
1091 mark entry symbol sections. */
1093 (struct bfd_link_info *);
1095 /* This function is called during section garbage collection to
1096 mark sections that define global symbols. */
1097 bfd_boolean (*gc_mark_dynamic_ref)
1098 (struct elf_link_hash_entry *, void *);
1100 /* This function is called during section gc to discover the section a
1101 particular relocation refers to. */
1102 elf_gc_mark_hook_fn gc_mark_hook;
1104 /* This function, if defined, is called after the first gc marking pass
1105 to allow the backend to mark additional sections. */
1106 bfd_boolean (*gc_mark_extra_sections)
1107 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1109 /* This function, if defined, is called during the sweep phase of gc
1110 in order that a backend might update any data structures it might
1112 bfd_boolean (*gc_sweep_hook)
1113 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1115 /* This function, if defined, is called after the ELF headers have
1116 been created. This allows for things like the OS and ABI versions
1118 void (*elf_backend_post_process_headers)
1119 (bfd *, struct bfd_link_info *);
1121 /* This function, if defined, prints a symbol to file and returns the
1122 name of the symbol to be printed. It should return NULL to fall
1123 back to default symbol printing. */
1124 const char *(*elf_backend_print_symbol_all)
1125 (bfd *, void *, asymbol *);
1127 /* This function, if defined, is called after all local symbols and
1128 global symbols converted to locals are emitted into the symtab
1129 section. It allows the backend to emit special local symbols
1130 not handled in the hash table. */
1131 bfd_boolean (*elf_backend_output_arch_local_syms)
1132 (bfd *, struct bfd_link_info *, void *,
1133 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1134 struct elf_link_hash_entry *));
1136 /* This function, if defined, is called after all symbols are emitted
1137 into the symtab section. It allows the backend to emit special
1138 global symbols not handled in the hash table. */
1139 bfd_boolean (*elf_backend_output_arch_syms)
1140 (bfd *, struct bfd_link_info *, void *,
1141 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1142 struct elf_link_hash_entry *));
1144 /* Filter what symbols of the output file to include in the import
1145 library if one is created. */
1146 unsigned int (*elf_backend_filter_implib_symbols)
1147 (bfd *, struct bfd_link_info *, asymbol **, long);
1149 /* Copy any information related to dynamic linking from a pre-existing
1150 symbol to a newly created symbol. Also called to copy flags and
1151 other back-end info to a weakdef, in which case the symbol is not
1152 newly created and plt/got refcounts and dynamic indices should not
1154 void (*elf_backend_copy_indirect_symbol)
1155 (struct bfd_link_info *, struct elf_link_hash_entry *,
1156 struct elf_link_hash_entry *);
1158 /* Modify any information related to dynamic linking such that the
1159 symbol is not exported. */
1160 void (*elf_backend_hide_symbol)
1161 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1163 /* A function to do additional symbol fixup, called by
1164 _bfd_elf_fix_symbol_flags. */
1165 bfd_boolean (*elf_backend_fixup_symbol)
1166 (struct bfd_link_info *, struct elf_link_hash_entry *);
1168 /* Merge the backend specific symbol attribute. */
1169 void (*elf_backend_merge_symbol_attribute)
1170 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1173 /* This function, if defined, will return a string containing the
1174 name of a target-specific dynamic tag. */
1175 char *(*elf_backend_get_target_dtag)
1178 /* Decide whether an undefined symbol is special and can be ignored.
1179 This is the case for OPTIONAL symbols on IRIX. */
1180 bfd_boolean (*elf_backend_ignore_undef_symbol)
1181 (struct elf_link_hash_entry *);
1183 /* Emit relocations. Overrides default routine for emitting relocs,
1184 except during a relocatable link, or if all relocs are being emitted. */
1185 bfd_boolean (*elf_backend_emit_relocs)
1186 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1187 struct elf_link_hash_entry **);
1189 /* Update relocations. It is allowed to change the number and the order.
1190 In such a case hashes should be invalidated. */
1191 void (*elf_backend_update_relocs)
1192 (asection *, struct bfd_elf_section_reloc_data *);
1194 /* Count relocations. Not called for relocatable links
1195 or if all relocs are being preserved in the output. */
1196 unsigned int (*elf_backend_count_relocs)
1197 (struct bfd_link_info *, asection *);
1199 /* Count additionals relocations. Called for relocatable links if
1200 additional relocations needs to be created. */
1201 unsigned int (*elf_backend_count_additional_relocs)
1204 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1205 by r_offset. If NULL, default to true. */
1206 bfd_boolean (*sort_relocs_p)
1209 /* This function, if defined, is called when an NT_PRSTATUS note is found
1211 bfd_boolean (*elf_backend_grok_prstatus)
1212 (bfd *, Elf_Internal_Note *);
1214 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1215 note is found in a core file. */
1216 bfd_boolean (*elf_backend_grok_psinfo)
1217 (bfd *, Elf_Internal_Note *);
1219 /* This function, if defined, is called to write a note to a corefile. */
1220 char *(*elf_backend_write_core_note)
1221 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1223 /* This function, if defined, is called to convert target-specific
1224 section flag names into hex values. */
1225 flagword (*elf_backend_lookup_section_flags_hook)
1228 /* This function returns class of a reloc type. */
1229 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1230 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1232 /* This function, if defined, removes information about discarded functions
1233 from other sections which mention them. */
1234 bfd_boolean (*elf_backend_discard_info)
1235 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1237 /* This function, if defined, signals that the function above has removed
1238 the discarded relocations for this section. */
1239 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1242 /* What to do when ld finds relocations against symbols defined in
1243 discarded sections. */
1244 unsigned int (*action_discarded)
1247 /* This function returns the width of FDE pointers in bytes, or 0 if
1248 that can't be determined for some reason. The default definition
1249 goes by the bfd's EI_CLASS. */
1250 unsigned int (*elf_backend_eh_frame_address_size)
1251 (bfd *, asection *);
1253 /* These functions tell elf-eh-frame whether to attempt to turn
1254 absolute or lsda encodings into pc-relative ones. The default
1255 definition enables these transformations. */
1256 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1257 (bfd *, struct bfd_link_info *, asection *);
1258 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1259 (bfd *, struct bfd_link_info *, asection *);
1261 /* This function returns an encoding after computing the encoded
1262 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1263 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1264 The default definition chooses a 32-bit PC-relative encoding. */
1265 bfd_byte (*elf_backend_encode_eh_address)
1266 (bfd *abfd, struct bfd_link_info *info,
1267 asection *osec, bfd_vma offset,
1268 asection *loc_sec, bfd_vma loc_offset,
1271 /* This function, if defined, may write out the given section.
1272 Returns TRUE if it did so and FALSE if the caller should. */
1273 bfd_boolean (*elf_backend_write_section)
1274 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1276 /* The level of IRIX compatibility we're striving for.
1277 MIPS ELF specific function. */
1278 irix_compat_t (*elf_backend_mips_irix_compat)
1281 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1282 (unsigned int, bfd_boolean);
1284 /* The swapping table to use when dealing with ECOFF information.
1285 Used for the MIPS ELF .mdebug section. */
1286 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1288 /* This function implements `bfd_elf_bfd_from_remote_memory';
1289 see elf.c, elfcode.h. */
1290 bfd *(*elf_backend_bfd_from_remote_memory)
1291 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1292 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1293 bfd_size_type len));
1295 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1297 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1299 /* Is symbol defined in common section? */
1300 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1302 /* Return a common section index for section. */
1303 unsigned int (*common_section_index) (asection *);
1305 /* Return a common section for section. */
1306 asection *(*common_section) (asection *);
1308 /* Return TRUE if we can merge 2 definitions. */
1309 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1310 const Elf_Internal_Sym *, asection **,
1311 bfd_boolean, bfd_boolean,
1312 bfd *, const asection *);
1314 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1315 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1317 /* Return TRUE if type is a function symbol type. */
1318 bfd_boolean (*is_function_type) (unsigned int type);
1320 /* If the ELF symbol SYM might be a function in SEC, return the
1321 function size and set *CODE_OFF to the function's entry point,
1322 otherwise return zero. */
1323 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1326 /* Return the section which RELOC_SEC applies to. */
1327 asection *(*get_reloc_section) (asection *reloc_sec);
1329 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
1330 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised,
1331 FALSE otherwise. Can be called multiple times for a given section,
1332 until it returns TRUE. Most of the times it is called ISECTION will be
1333 set to an input section that might be associated with the output section.
1334 The last time that it is called, ISECTION will be set to NULL. */
1335 bfd_boolean (*elf_backend_copy_special_section_fields)
1336 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection,
1337 Elf_Internal_Shdr *osection);
1339 /* Used to handle bad SHF_LINK_ORDER input. */
1340 void (*link_order_error_handler) (const char *, ...);
1342 /* Name of the PLT relocation section. */
1343 const char *relplt_name;
1345 /* Alternate EM_xxxx machine codes for this backend. */
1346 int elf_machine_alt1;
1347 int elf_machine_alt2;
1349 const struct elf_size_info *s;
1351 /* An array of target specific special sections. */
1352 const struct bfd_elf_special_section *special_sections;
1354 /* The size in bytes of the header for the GOT. This includes the
1355 so-called reserved entries on some systems. */
1356 bfd_vma got_header_size;
1358 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1359 otherwise by the local symbol with index SYMNDX in IBFD. */
1360 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1361 struct elf_link_hash_entry *h,
1362 bfd *ibfd, unsigned long symndx);
1364 /* The vendor name to use for a processor-standard attributes section. */
1365 const char *obj_attrs_vendor;
1367 /* The section name to use for a processor-standard attributes section. */
1368 const char *obj_attrs_section;
1370 /* Return 1, 2 or 3 to indicate what type of arguments a
1371 processor-specific tag takes. */
1372 int (*obj_attrs_arg_type) (int);
1374 /* The section type to use for an attributes section. */
1375 unsigned int obj_attrs_section_type;
1377 /* This function determines the order in which any attributes are
1378 written. It must be defined for input in the range
1379 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1380 is used in order to make unity easy). The returned value is the
1381 actual tag number to place in the input position. */
1382 int (*obj_attrs_order) (int);
1384 /* Handle merging unknown attributes; either warn and return TRUE,
1385 or give an error and return FALSE. */
1386 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1388 /* Encoding used for compact EH tables. */
1389 int (*compact_eh_encoding) (struct bfd_link_info *);
1391 /* Opcode representing no unwind. */
1392 int (*cant_unwind_opcode) (struct bfd_link_info *);
1394 /* This is non-zero if static TLS segments require a special alignment. */
1395 unsigned static_tls_alignment;
1397 /* Alignment for the PT_GNU_STACK segment. */
1398 unsigned stack_align;
1400 /* Flag bits to assign to a section of type SHT_STRTAB. */
1401 unsigned long elf_strtab_flags;
1403 /* This is TRUE if the linker should act like collect and gather
1404 global constructors and destructors by name. This is TRUE for
1405 MIPS ELF because the Irix 5 tools can not handle the .init
1407 unsigned collect : 1;
1409 /* This is TRUE if the linker should ignore changes to the type of a
1410 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1411 record undefined functions as STT_OBJECT although the definitions
1413 unsigned type_change_ok : 1;
1415 /* Whether the backend may use REL relocations. (Some backends use
1416 both REL and RELA relocations, and this flag is set for those
1418 unsigned may_use_rel_p : 1;
1420 /* Whether the backend may use RELA relocations. (Some backends use
1421 both REL and RELA relocations, and this flag is set for those
1423 unsigned may_use_rela_p : 1;
1425 /* Whether the default relocation type is RELA. If a backend with
1426 this flag set wants REL relocations for a particular section,
1427 it must note that explicitly. Similarly, if this flag is clear,
1428 and the backend wants RELA relocations for a particular
1430 unsigned default_use_rela_p : 1;
1432 /* True if PLT and copy relocations should be RELA by default. */
1433 unsigned rela_plts_and_copies_p : 1;
1435 /* Set if RELA relocations for a relocatable link can be handled by
1436 generic code. Backends that set this flag need do nothing in the
1437 backend relocate_section routine for relocatable linking. */
1438 unsigned rela_normal : 1;
1440 /* Set if DT_REL/DT_RELA/DT_RELSZ/DT_RELASZ should not include PLT
1442 unsigned dtrel_excludes_plt : 1;
1444 /* TRUE if addresses "naturally" sign extend. This is used when
1445 swapping in from Elf32 when BFD64. */
1446 unsigned sign_extend_vma : 1;
1448 unsigned want_got_plt : 1;
1449 unsigned plt_readonly : 1;
1450 unsigned want_plt_sym : 1;
1451 unsigned plt_not_loaded : 1;
1452 unsigned plt_alignment : 4;
1453 unsigned can_gc_sections : 1;
1454 unsigned can_refcount : 1;
1455 unsigned want_got_sym : 1;
1456 unsigned want_dynbss : 1;
1457 unsigned want_dynrelro : 1;
1459 /* Targets which do not support physical addressing often require
1460 that the p_paddr field in the section header to be set to zero.
1461 This field indicates whether this behavior is required. */
1462 unsigned want_p_paddr_set_to_zero : 1;
1464 /* Target has broken hardware and/or kernel that requires pages not
1465 to be mapped twice with different permissions. */
1466 unsigned no_page_alias : 1;
1468 /* True if an object file lacking a .note.GNU-stack section
1469 should be assumed to be requesting exec stack. At least one
1470 other file in the link needs to have a .note.GNU-stack section
1471 for a PT_GNU_STACK segment to be created. */
1472 unsigned default_execstack : 1;
1474 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1475 in length rather than sec->size in length, if sec->rawsize is
1476 non-zero and smaller than sec->size. */
1477 unsigned caches_rawsize : 1;
1479 /* Address of protected data defined in the shared library may be
1480 external, i.e., due to copy relocation. */
1481 unsigned extern_protected_data : 1;
1484 /* Information about reloc sections associated with a bfd_elf_section_data
1486 struct bfd_elf_section_reloc_data
1488 /* The ELF header for the reloc section associated with this
1490 Elf_Internal_Shdr *hdr;
1491 /* The number of relocations currently assigned to HDR. */
1493 /* The ELF section number of the reloc section. Only used for an
1496 /* Used by the backend linker to store the symbol hash table entries
1497 associated with relocs against global symbols. */
1498 struct elf_link_hash_entry **hashes;
1501 /* Information stored for each BFD section in an ELF file. This
1502 structure is allocated by elf_new_section_hook. */
1504 struct bfd_elf_section_data
1506 /* The ELF header for this section. */
1507 Elf_Internal_Shdr this_hdr;
1509 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1510 struct flag_info *section_flag_info;
1512 /* Information about the REL and RELA reloc sections associated
1513 with this section, if any. */
1514 struct bfd_elf_section_reloc_data rel, rela;
1516 /* The ELF section number of this section. */
1519 /* Used by the backend linker when generating a shared library to
1520 record the dynamic symbol index for a section symbol
1521 corresponding to this section. A value of 0 means that there is
1522 no dynamic symbol for this section. */
1525 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1526 asection *linked_to;
1528 /* A pointer to the swapped relocs. If the section uses REL relocs,
1529 rather than RELA, all the r_addend fields will be zero. This
1530 pointer may be NULL. It is used by the backend linker. */
1531 Elf_Internal_Rela *relocs;
1533 /* A pointer to a linked list tracking dynamic relocs copied for
1537 /* A pointer to the bfd section used for dynamic relocs. */
1541 /* Group name, if this section is a member of a group. */
1544 /* Group signature sym, if this is the SHT_GROUP section. */
1545 struct bfd_symbol *id;
1548 /* For a member of a group, points to the SHT_GROUP section.
1549 NULL for the SHT_GROUP section itself and non-group sections. */
1550 asection *sec_group;
1552 /* A linked list of member sections in the group. Circular when used by
1553 the linker. For the SHT_GROUP section, points at first member. */
1554 asection *next_in_group;
1556 /* The FDEs associated with this section. The u.fde.next_in_section
1557 field acts as a chain pointer. */
1558 struct eh_cie_fde *fde_list;
1560 /* Link from a text section to its .eh_frame_entry section. */
1561 asection *eh_frame_entry;
1563 /* A pointer used for various section optimizations. */
1567 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1568 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1569 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1570 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1571 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1572 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1573 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1574 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1575 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1576 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1578 #define xvec_get_elf_backend_data(xvec) \
1579 ((const struct elf_backend_data *) (xvec)->backend_data)
1581 #define get_elf_backend_data(abfd) \
1582 xvec_get_elf_backend_data ((abfd)->xvec)
1584 /* The least object attributes (within an attributes subsection) known
1585 for any target. Some code assumes that the value 0 is not used and
1586 the field for that attribute can instead be used as a marker to
1587 indicate that attributes have been initialized. */
1588 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1590 /* The maximum number of known object attributes for any target. */
1591 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1593 /* The value of an object attribute. The type indicates whether the attribute
1594 holds and integer, a string, or both. It can also indicate that there can
1595 be no default (i.e. all values must be written to file, even zero). */
1597 typedef struct obj_attribute
1599 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1600 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1601 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1603 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1604 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1605 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1612 typedef struct obj_attribute_list
1614 struct obj_attribute_list *next;
1617 } obj_attribute_list;
1619 /* Object attributes may either be defined by the processor ABI, index
1620 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1621 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1622 #define OBJ_ATTR_PROC 0
1623 #define OBJ_ATTR_GNU 1
1624 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1625 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1627 /* The following object attribute tags are taken as generic, for all
1628 targets and for "gnu" where there is no target standard. */
1635 Tag_compatibility = 32
1638 /* The following struct stores information about every SystemTap section
1639 found in the object file. */
1642 struct sdt_note *next;
1647 /* tdata information grabbed from an elf core file. */
1648 struct core_elf_obj_tdata
1657 /* Extra tdata information held for output ELF BFDs. */
1658 struct output_elf_obj_tdata
1660 struct elf_segment_map *seg_map;
1661 struct elf_strtab_hash *strtab_ptr;
1663 /* STT_SECTION symbols for each section */
1664 asymbol **section_syms;
1666 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1668 asection *eh_frame_hdr;
1670 /* NT_GNU_BUILD_ID note type info. */
1673 bfd_boolean (*after_write_object_contents) (bfd *);
1678 /* Records the result of `get_program_header_size'. */
1679 bfd_size_type program_header_size;
1681 /* Used when laying out sections. */
1682 file_ptr next_file_pos;
1684 int num_section_syms;
1685 unsigned int shstrtab_section, strtab_section;
1687 /* Segment flags for the PT_GNU_STACK segment. */
1688 unsigned int stack_flags;
1690 /* This is set to TRUE if the object was created by the backend
1694 /* Used to determine if the e_flags field has been initialized */
1695 bfd_boolean flags_init;
1698 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC
1699 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1700 field in the ELF header structure. */
1701 enum elf_gnu_symbols
1703 elf_gnu_symbol_none = 0,
1704 elf_gnu_symbol_any = 1 << 0,
1705 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1),
1706 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2),
1707 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique)
1710 typedef struct elf_section_list
1712 Elf_Internal_Shdr hdr;
1714 struct elf_section_list * next;
1717 /* Some private data is stashed away for future use using the tdata pointer
1718 in the bfd structure. */
1720 struct elf_obj_tdata
1722 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1723 Elf_Internal_Shdr **elf_sect_ptr;
1724 Elf_Internal_Phdr *phdr;
1725 Elf_Internal_Shdr symtab_hdr;
1726 Elf_Internal_Shdr shstrtab_hdr;
1727 Elf_Internal_Shdr strtab_hdr;
1728 Elf_Internal_Shdr dynsymtab_hdr;
1729 Elf_Internal_Shdr dynstrtab_hdr;
1730 Elf_Internal_Shdr dynversym_hdr;
1731 Elf_Internal_Shdr dynverref_hdr;
1732 Elf_Internal_Shdr dynverdef_hdr;
1733 elf_section_list * symtab_shndx_list;
1734 bfd_vma gp; /* The gp value */
1735 unsigned int gp_size; /* The gp size */
1736 unsigned int num_elf_sections; /* elf_sect_ptr size */
1738 /* A mapping from external symbols to entries in the linker hash
1739 table, used when linking. This is indexed by the symbol index
1740 minus the sh_info field of the symbol table header. */
1741 struct elf_link_hash_entry **sym_hashes;
1743 /* Track usage and final offsets of GOT entries for local symbols.
1744 This array is indexed by symbol index. Elements are used
1745 identically to "got" in struct elf_link_hash_entry. */
1748 bfd_signed_vma *refcounts;
1750 struct got_entry **ents;
1753 /* The linker ELF emulation code needs to let the backend ELF linker
1754 know what filename should be used for a dynamic object if the
1755 dynamic object is found using a search. The emulation code then
1756 sometimes needs to know what name was actually used. Until the
1757 file has been added to the linker symbol table, this field holds
1758 the name the linker wants. After it has been added, it holds the
1759 name actually used, which will be the DT_SONAME entry if there is
1761 const char *dt_name;
1763 /* The linker emulation needs to know what audit libs
1764 are used by a dynamic object. */
1765 const char *dt_audit;
1767 /* Used by find_nearest_line entry point. */
1770 /* A place to stash dwarf1 info for this bfd. */
1771 struct dwarf1_debug *dwarf1_find_line_info;
1773 /* A place to stash dwarf2 info for this bfd. */
1774 void *dwarf2_find_line_info;
1776 /* Stash away info for yet another find line/function variant. */
1777 void *elf_find_function_cache;
1779 /* Number of symbol version definitions we are about to emit. */
1780 unsigned int cverdefs;
1782 /* Number of symbol version references we are about to emit. */
1783 unsigned int cverrefs;
1785 /* Symbol version definitions in external objects. */
1786 Elf_Internal_Verdef *verdef;
1788 /* Symbol version references to external objects. */
1789 Elf_Internal_Verneed *verref;
1791 /* A pointer to the .eh_frame section. */
1792 asection *eh_frame_section;
1794 /* Symbol buffer. */
1797 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1798 obj_attribute_list *other_obj_attributes[2];
1800 /* Linked-list containing information about every Systemtap section
1801 found in the object file. Each section corresponds to one entry
1803 struct sdt_note *sdt_note_head;
1805 Elf_Internal_Shdr **group_sect_ptr;
1808 unsigned int symtab_section, dynsymtab_section;
1809 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1811 /* An identifier used to distinguish different target
1812 specific extensions to this structure. */
1813 enum elf_target_id object_id;
1815 /* Whether a dyanmic object was specified normally on the linker
1816 command line, or was specified when --as-needed was in effect,
1817 or was found via a DT_NEEDED entry. */
1818 enum dynamic_lib_link_class dyn_lib_class;
1820 /* Irix 5 often screws up the symbol table, sorting local symbols
1821 after global symbols. This flag is set if the symbol table in
1822 this BFD appears to be screwed up. If it is, we ignore the
1823 sh_info field in the symbol table header, and always read all the
1825 bfd_boolean bad_symtab;
1827 enum elf_gnu_symbols has_gnu_symbols;
1829 /* Information grabbed from an elf core file. */
1830 struct core_elf_obj_tdata *core;
1832 /* More information held for output ELF BFDs. */
1833 struct output_elf_obj_tdata *o;
1836 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1838 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1839 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1840 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1841 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1842 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1843 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1844 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1845 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1846 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1847 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1848 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1849 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1850 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
1851 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1852 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1853 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1854 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1855 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1856 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1857 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1858 #define elf_eh_frame_section(bfd) \
1859 (elf_tdata(bfd) -> eh_frame_section)
1860 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1861 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1862 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1863 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1864 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1865 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1866 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1867 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1868 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1869 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1870 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1871 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1872 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1873 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1874 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1875 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1876 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1877 #define elf_known_obj_attributes_proc(bfd) \
1878 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1879 #define elf_other_obj_attributes_proc(bfd) \
1880 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1882 extern void _bfd_elf_swap_verdef_in
1883 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1884 extern void _bfd_elf_swap_verdef_out
1885 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1886 extern void _bfd_elf_swap_verdaux_in
1887 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1888 extern void _bfd_elf_swap_verdaux_out
1889 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1890 extern void _bfd_elf_swap_verneed_in
1891 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1892 extern void _bfd_elf_swap_verneed_out
1893 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1894 extern void _bfd_elf_swap_vernaux_in
1895 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1896 extern void _bfd_elf_swap_vernaux_out
1897 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1898 extern void _bfd_elf_swap_versym_in
1899 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1900 extern void _bfd_elf_swap_versym_out
1901 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1903 extern unsigned int _bfd_elf_section_from_bfd_section
1904 (bfd *, asection *);
1905 extern char *bfd_elf_string_from_elf_section
1906 (bfd *, unsigned, unsigned);
1907 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1908 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1909 Elf_External_Sym_Shndx *);
1910 extern const char *bfd_elf_sym_name
1911 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1913 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1915 extern bfd_boolean _bfd_elf_print_private_bfd_data
1917 const char * _bfd_elf_get_symbol_version_string
1918 (bfd *, asymbol *, bfd_boolean *);
1919 extern void bfd_elf_print_symbol
1920 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1922 extern unsigned int _bfd_elf_eh_frame_address_size
1923 (bfd *, asection *);
1924 extern bfd_byte _bfd_elf_encode_eh_address
1925 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1926 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1927 extern bfd_boolean _bfd_elf_can_make_relative
1928 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1930 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1931 (const struct bfd_link_info *, const asection *,
1932 const Elf_Internal_Rela *);
1933 extern bfd_vma _bfd_elf_rela_local_sym
1934 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1935 extern bfd_vma _bfd_elf_rel_local_sym
1936 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1937 extern bfd_vma _bfd_elf_section_offset
1938 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1940 extern unsigned long bfd_elf_hash
1942 extern unsigned long bfd_elf_gnu_hash
1945 extern bfd_reloc_status_type bfd_elf_generic_reloc
1946 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1947 extern bfd_boolean bfd_elf_allocate_object
1948 (bfd *, size_t, enum elf_target_id);
1949 extern bfd_boolean bfd_elf_make_object
1951 extern bfd_boolean bfd_elf_mkcorefile
1953 extern bfd_boolean _bfd_elf_make_section_from_shdr
1954 (bfd *, Elf_Internal_Shdr *, const char *, int);
1955 extern bfd_boolean _bfd_elf_make_section_from_phdr
1956 (bfd *, Elf_Internal_Phdr *, int, const char *);
1957 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1958 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1959 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1961 extern void _bfd_elf_link_hash_table_free
1963 extern void _bfd_elf_link_hash_copy_indirect
1964 (struct bfd_link_info *, struct elf_link_hash_entry *,
1965 struct elf_link_hash_entry *);
1966 extern void _bfd_elf_link_hash_hide_symbol
1967 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1968 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1969 (struct bfd_link_info *, struct elf_link_hash_entry *);
1970 extern bfd_boolean _bfd_elf_link_hash_table_init
1971 (struct elf_link_hash_table *, bfd *,
1972 struct bfd_hash_entry *(*)
1973 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1974 unsigned int, enum elf_target_id);
1975 extern bfd_boolean _bfd_elf_slurp_version_tables
1976 (bfd *, bfd_boolean);
1977 extern bfd_boolean _bfd_elf_merge_sections
1978 (bfd *, struct bfd_link_info *);
1979 extern bfd_boolean _bfd_elf_match_sections_by_type
1980 (bfd *, const asection *, bfd *, const asection *);
1981 extern bfd_boolean bfd_elf_is_group_section
1982 (bfd *, const struct bfd_section *);
1983 extern bfd_boolean _bfd_elf_section_already_linked
1984 (bfd *, asection *, struct bfd_link_info *);
1985 extern void bfd_elf_set_group_contents
1986 (bfd *, asection *, void *);
1987 extern unsigned int _bfd_elf_filter_global_symbols
1988 (bfd *, struct bfd_link_info *, asymbol **, long);
1989 extern asection *_bfd_elf_check_kept_section
1990 (asection *, struct bfd_link_info *);
1991 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1992 extern void _bfd_elf_copy_link_hash_symbol_type
1993 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1994 extern bfd_boolean _bfd_elf_size_group_sections
1995 (struct bfd_link_info *);
1996 extern bfd_boolean _bfd_elf_fixup_group_sections
1997 (bfd *, asection *);
1998 extern bfd_boolean _bfd_elf_copy_private_header_data
2000 extern bfd_boolean _bfd_elf_copy_private_symbol_data
2001 (bfd *, asymbol *, bfd *, asymbol *);
2002 #define _bfd_generic_init_private_section_data \
2003 _bfd_elf_init_private_section_data
2004 extern bfd_boolean _bfd_elf_init_private_section_data
2005 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
2006 extern bfd_boolean _bfd_elf_copy_private_section_data
2007 (bfd *, asection *, bfd *, asection *);
2008 extern bfd_boolean _bfd_elf_write_object_contents
2010 extern bfd_boolean _bfd_elf_write_corefile_contents
2012 extern bfd_boolean _bfd_elf_set_section_contents
2013 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
2014 extern long _bfd_elf_get_symtab_upper_bound
2016 extern long _bfd_elf_canonicalize_symtab
2017 (bfd *, asymbol **);
2018 extern long _bfd_elf_get_dynamic_symtab_upper_bound
2020 extern long _bfd_elf_canonicalize_dynamic_symtab
2021 (bfd *, asymbol **);
2022 extern long _bfd_elf_get_synthetic_symtab
2023 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
2024 extern long _bfd_elf_get_reloc_upper_bound
2026 extern long _bfd_elf_canonicalize_reloc
2027 (bfd *, sec_ptr, arelent **, asymbol **);
2028 extern asection * _bfd_elf_get_dynamic_reloc_section
2029 (bfd *, asection *, bfd_boolean);
2030 extern asection * _bfd_elf_make_dynamic_reloc_section
2031 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
2032 extern long _bfd_elf_get_dynamic_reloc_upper_bound
2034 extern long _bfd_elf_canonicalize_dynamic_reloc
2035 (bfd *, arelent **, asymbol **);
2036 extern asymbol *_bfd_elf_make_empty_symbol
2038 extern void _bfd_elf_get_symbol_info
2039 (bfd *, asymbol *, symbol_info *);
2040 extern bfd_boolean _bfd_elf_is_local_label_name
2041 (bfd *, const char *);
2042 extern alent *_bfd_elf_get_lineno
2044 extern bfd_boolean _bfd_elf_set_arch_mach
2045 (bfd *, enum bfd_architecture, unsigned long);
2046 extern bfd_boolean _bfd_elf_find_nearest_line
2047 (bfd *, asymbol **, asection *, bfd_vma,
2048 const char **, const char **, unsigned int *, unsigned int *);
2049 extern bfd_boolean _bfd_elf_find_line
2050 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
2051 extern bfd_boolean _bfd_elf_find_inliner_info
2052 (bfd *, const char **, const char **, unsigned int *);
2053 extern asymbol *_bfd_elf_find_function
2054 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
2055 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
2056 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
2057 extern int _bfd_elf_sizeof_headers
2058 (bfd *, struct bfd_link_info *);
2059 extern bfd_boolean _bfd_elf_new_section_hook
2060 (bfd *, asection *);
2061 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
2062 (const char *, const struct bfd_elf_special_section *, unsigned int);
2063 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
2064 (bfd *, asection *);
2066 /* If the target doesn't have reloc handling written yet: */
2067 extern void _bfd_elf_no_info_to_howto
2068 (bfd *, arelent *, Elf_Internal_Rela *);
2070 extern bfd_boolean bfd_section_from_shdr
2071 (bfd *, unsigned int shindex);
2072 extern bfd_boolean bfd_section_from_phdr
2073 (bfd *, Elf_Internal_Phdr *, int);
2075 extern int _bfd_elf_symbol_from_bfd_symbol
2076 (bfd *, asymbol **);
2078 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
2079 (struct sym_cache *, bfd *, unsigned long);
2080 extern asection *bfd_section_from_elf_index
2081 (bfd *, unsigned int);
2083 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2085 extern void _bfd_elf_strtab_free
2086 (struct elf_strtab_hash *);
2087 extern size_t _bfd_elf_strtab_add
2088 (struct elf_strtab_hash *, const char *, bfd_boolean);
2089 extern void _bfd_elf_strtab_addref
2090 (struct elf_strtab_hash *, size_t);
2091 extern void _bfd_elf_strtab_delref
2092 (struct elf_strtab_hash *, size_t);
2093 extern unsigned int _bfd_elf_strtab_refcount
2094 (struct elf_strtab_hash *, size_t);
2095 extern void _bfd_elf_strtab_clear_all_refs
2096 (struct elf_strtab_hash *);
2097 extern void *_bfd_elf_strtab_save
2098 (struct elf_strtab_hash *);
2099 extern void _bfd_elf_strtab_restore
2100 (struct elf_strtab_hash *, void *);
2101 extern bfd_size_type _bfd_elf_strtab_size
2102 (struct elf_strtab_hash *);
2103 extern bfd_size_type _bfd_elf_strtab_offset
2104 (struct elf_strtab_hash *, size_t);
2105 extern bfd_boolean _bfd_elf_strtab_emit
2106 (bfd *, struct elf_strtab_hash *);
2107 extern void _bfd_elf_strtab_finalize
2108 (struct elf_strtab_hash *);
2110 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2111 (bfd *, struct bfd_link_info *);
2112 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2113 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2114 extern void _bfd_elf_parse_eh_frame
2115 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2116 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2117 (struct bfd_link_info *info);
2119 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2120 (bfd *, struct bfd_link_info *, asection *,
2121 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2122 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2123 (bfd *, struct bfd_link_info *);
2124 extern bfd_vma _bfd_elf_eh_frame_section_offset
2125 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2126 extern bfd_boolean _bfd_elf_write_section_eh_frame
2127 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2128 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2129 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2130 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2131 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2132 (bfd *, struct bfd_link_info *);
2133 extern bfd_boolean _bfd_elf_eh_frame_present
2134 (struct bfd_link_info *);
2135 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2136 (struct bfd_link_info *);
2137 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2138 (struct bfd_link_info *);
2140 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2142 extern long _bfd_elf_link_lookup_local_dynindx
2143 (struct bfd_link_info *, bfd *, long);
2144 extern bfd_boolean _bfd_elf_compute_section_file_positions
2145 (bfd *, struct bfd_link_info *);
2146 extern file_ptr _bfd_elf_assign_file_position_for_section
2147 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2149 extern bfd_boolean _bfd_elf_validate_reloc
2152 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2153 (bfd *, struct bfd_link_info *);
2154 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2155 (bfd *, struct bfd_link_info *, asection *);
2156 extern bfd_boolean _bfd_elf_create_dynamic_sections
2157 (bfd *, struct bfd_link_info *);
2158 extern bfd_boolean _bfd_elf_create_got_section
2159 (bfd *, struct bfd_link_info *);
2160 extern asection *_bfd_elf_section_for_symbol
2161 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2162 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2163 (bfd *, struct bfd_link_info *, asection *, const char *);
2164 extern void _bfd_elf_init_1_index_section
2165 (bfd *, struct bfd_link_info *);
2166 extern void _bfd_elf_init_2_index_sections
2167 (bfd *, struct bfd_link_info *);
2169 extern bfd_boolean _bfd_elfcore_make_pseudosection
2170 (bfd *, char *, size_t, ufile_ptr);
2171 extern char *_bfd_elfcore_strndup
2172 (bfd *, char *, size_t);
2174 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2175 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2177 extern bfd_boolean _bfd_elf_link_output_relocs
2178 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2179 struct elf_link_hash_entry **);
2181 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2182 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2184 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2185 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2187 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2188 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2190 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2191 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2193 extern bfd_boolean _bfd_elf_setup_sections
2196 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2198 extern const bfd_target *bfd_elf32_object_p
2200 extern const bfd_target *bfd_elf32_core_file_p
2202 extern char *bfd_elf32_core_file_failing_command
2204 extern int bfd_elf32_core_file_failing_signal
2206 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2208 extern int bfd_elf32_core_file_pid
2211 extern bfd_boolean bfd_elf32_swap_symbol_in
2212 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2213 extern void bfd_elf32_swap_symbol_out
2214 (bfd *, const Elf_Internal_Sym *, void *, void *);
2215 extern void bfd_elf32_swap_reloc_in
2216 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2217 extern void bfd_elf32_swap_reloc_out
2218 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2219 extern void bfd_elf32_swap_reloca_in
2220 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2221 extern void bfd_elf32_swap_reloca_out
2222 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2223 extern void bfd_elf32_swap_phdr_in
2224 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2225 extern void bfd_elf32_swap_phdr_out
2226 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2227 extern void bfd_elf32_swap_dyn_in
2228 (bfd *, const void *, Elf_Internal_Dyn *);
2229 extern void bfd_elf32_swap_dyn_out
2230 (bfd *, const Elf_Internal_Dyn *, void *);
2231 extern long bfd_elf32_slurp_symbol_table
2232 (bfd *, asymbol **, bfd_boolean);
2233 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2235 extern int bfd_elf32_write_out_phdrs
2236 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2237 extern bfd_boolean bfd_elf32_checksum_contents
2238 (bfd * , void (*) (const void *, size_t, void *), void *);
2239 extern void bfd_elf32_write_relocs
2240 (bfd *, asection *, void *);
2241 extern bfd_boolean bfd_elf32_slurp_reloc_table
2242 (bfd *, asection *, asymbol **, bfd_boolean);
2244 extern const bfd_target *bfd_elf64_object_p
2246 extern const bfd_target *bfd_elf64_core_file_p
2248 extern char *bfd_elf64_core_file_failing_command
2250 extern int bfd_elf64_core_file_failing_signal
2252 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2254 extern int bfd_elf64_core_file_pid
2257 extern bfd_boolean bfd_elf64_swap_symbol_in
2258 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2259 extern void bfd_elf64_swap_symbol_out
2260 (bfd *, const Elf_Internal_Sym *, void *, void *);
2261 extern void bfd_elf64_swap_reloc_in
2262 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2263 extern void bfd_elf64_swap_reloc_out
2264 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2265 extern void bfd_elf64_swap_reloca_in
2266 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2267 extern void bfd_elf64_swap_reloca_out
2268 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2269 extern void bfd_elf64_swap_phdr_in
2270 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2271 extern void bfd_elf64_swap_phdr_out
2272 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2273 extern void bfd_elf64_swap_dyn_in
2274 (bfd *, const void *, Elf_Internal_Dyn *);
2275 extern void bfd_elf64_swap_dyn_out
2276 (bfd *, const Elf_Internal_Dyn *, void *);
2277 extern long bfd_elf64_slurp_symbol_table
2278 (bfd *, asymbol **, bfd_boolean);
2279 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2281 extern int bfd_elf64_write_out_phdrs
2282 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2283 extern bfd_boolean bfd_elf64_checksum_contents
2284 (bfd * , void (*) (const void *, size_t, void *), void *);
2285 extern void bfd_elf64_write_relocs
2286 (bfd *, asection *, void *);
2287 extern bfd_boolean bfd_elf64_slurp_reloc_table
2288 (bfd *, asection *, asymbol **, bfd_boolean);
2290 extern bfd_boolean _bfd_elf_default_relocs_compatible
2291 (const bfd_target *, const bfd_target *);
2293 extern bfd_boolean _bfd_elf_relocs_compatible
2294 (const bfd_target *, const bfd_target *);
2295 extern bfd_boolean _bfd_elf_notice_as_needed
2296 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2298 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2299 (bfd *, struct bfd_link_info *, const char *);
2300 extern bfd_boolean bfd_elf_link_add_symbols
2301 (bfd *, struct bfd_link_info *);
2302 extern bfd_boolean _bfd_elf_add_dynamic_entry
2303 (struct bfd_link_info *, bfd_vma, bfd_vma);
2304 extern bfd_boolean _bfd_elf_link_check_relocs
2305 (bfd *, struct bfd_link_info *);
2307 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2308 (struct bfd_link_info *, struct elf_link_hash_entry *);
2310 extern int bfd_elf_link_record_local_dynamic_symbol
2311 (struct bfd_link_info *, bfd *, long);
2313 extern bfd_boolean _bfd_elf_close_and_cleanup
2316 extern bfd_boolean _bfd_elf_common_definition
2317 (Elf_Internal_Sym *);
2319 extern unsigned int _bfd_elf_common_section_index
2322 extern asection *_bfd_elf_common_section
2325 extern bfd_vma _bfd_elf_default_got_elt_size
2326 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2329 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2330 (bfd *, arelent *, struct bfd_symbol *, void *,
2331 asection *, bfd *, char **);
2333 extern bfd_boolean bfd_elf_final_link
2334 (bfd *, struct bfd_link_info *);
2336 extern void _bfd_elf_gc_keep
2337 (struct bfd_link_info *info);
2339 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2340 (struct elf_link_hash_entry *h, void *inf);
2342 extern bfd_boolean bfd_elf_gc_sections
2343 (bfd *, struct bfd_link_info *);
2345 extern bfd_boolean bfd_elf_gc_record_vtinherit
2346 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2348 extern bfd_boolean bfd_elf_gc_record_vtentry
2349 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2351 extern asection *_bfd_elf_gc_mark_hook
2352 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2353 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2355 extern asection *_bfd_elf_gc_mark_rsec
2356 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2357 struct elf_reloc_cookie *, bfd_boolean *);
2359 extern bfd_boolean _bfd_elf_gc_mark_reloc
2360 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2361 struct elf_reloc_cookie *);
2363 extern bfd_boolean _bfd_elf_gc_mark_fdes
2364 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2365 struct elf_reloc_cookie *);
2367 extern bfd_boolean _bfd_elf_gc_mark
2368 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2370 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2371 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2373 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2374 (bfd *, struct bfd_link_info *);
2376 extern bfd_boolean bfd_elf_gc_common_final_link
2377 (bfd *, struct bfd_link_info *);
2379 extern asection *_bfd_elf_is_start_stop
2380 (const struct bfd_link_info *, struct elf_link_hash_entry *);
2382 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2385 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2386 (bfd *, asection *);
2388 extern bfd_boolean _bfd_elf_map_sections_to_segments
2389 (bfd *, struct bfd_link_info *);
2391 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2393 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2396 extern asection *_bfd_elf_get_reloc_section (asection *);
2398 extern int bfd_elf_get_default_section_type (flagword);
2400 extern bfd_boolean bfd_elf_lookup_section_flags
2401 (struct bfd_link_info *, struct flag_info *, asection *);
2403 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2404 (bfd * abfd, asection * section);
2406 /* PowerPC @tls opcode transform/validate. */
2407 extern unsigned int _bfd_elf_ppc_at_tls_transform
2408 (unsigned int, unsigned int);
2409 /* PowerPC @tprel opcode transform/validate. */
2410 extern unsigned int _bfd_elf_ppc_at_tprel_transform
2411 (unsigned int, unsigned int);
2412 /* PowerPC elf_object_p tweak. */
2413 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *);
2414 /* PowerPC .gnu.attributes handling common to both 32-bit and 64-bit. */
2415 extern void _bfd_elf_ppc_merge_fp_attributes (bfd *, struct bfd_link_info *);
2417 /* Exported interface for writing elf corefile notes. */
2418 extern char *elfcore_write_note
2419 (bfd *, char *, int *, const char *, int, const void *, int);
2420 extern char *elfcore_write_prpsinfo
2421 (bfd *, char *, int *, const char *, const char *);
2422 extern char *elfcore_write_prstatus
2423 (bfd *, char *, int *, long, int, const void *);
2424 extern char * elfcore_write_pstatus
2425 (bfd *, char *, int *, long, int, const void *);
2426 extern char *elfcore_write_prfpreg
2427 (bfd *, char *, int *, const void *, int);
2428 extern char *elfcore_write_prxfpreg
2429 (bfd *, char *, int *, const void *, int);
2430 extern char *elfcore_write_xstatereg
2431 (bfd *, char *, int *, const void *, int);
2432 extern char *elfcore_write_ppc_vmx
2433 (bfd *, char *, int *, const void *, int);
2434 extern char *elfcore_write_ppc_vsx
2435 (bfd *, char *, int *, const void *, int);
2436 extern char *elfcore_write_s390_timer
2437 (bfd *, char *, int *, const void *, int);
2438 extern char *elfcore_write_s390_todcmp
2439 (bfd *, char *, int *, const void *, int);
2440 extern char *elfcore_write_s390_todpreg
2441 (bfd *, char *, int *, const void *, int);
2442 extern char *elfcore_write_s390_ctrs
2443 (bfd *, char *, int *, const void *, int);
2444 extern char *elfcore_write_s390_prefix
2445 (bfd *, char *, int *, const void *, int);
2446 extern char *elfcore_write_s390_last_break
2447 (bfd *, char *, int *, const void *, int);
2448 extern char *elfcore_write_s390_system_call
2449 (bfd *, char *, int *, const void *, int);
2450 extern char *elfcore_write_s390_tdb
2451 (bfd *, char *, int *, const void *, int);
2452 extern char *elfcore_write_s390_vxrs_low
2453 (bfd *, char *, int *, const void *, int);
2454 extern char *elfcore_write_s390_vxrs_high
2455 (bfd *, char *, int *, const void *, int);
2456 extern char *elfcore_write_arm_vfp
2457 (bfd *, char *, int *, const void *, int);
2458 extern char *elfcore_write_aarch_tls
2459 (bfd *, char *, int *, const void *, int);
2460 extern char *elfcore_write_aarch_hw_break
2461 (bfd *, char *, int *, const void *, int);
2462 extern char *elfcore_write_aarch_hw_watch
2463 (bfd *, char *, int *, const void *, int);
2464 extern char *elfcore_write_lwpstatus
2465 (bfd *, char *, int *, long, int, const void *);
2466 extern char *elfcore_write_register_note
2467 (bfd *, char *, int *, const char *, const void *, int);
2469 /* Internal structure which holds information to be included in the
2470 PRPSINFO section of Linux core files.
2472 This is an "internal" structure in the sense that it should be used
2473 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2474 function), so things like endianess shouldn't be an issue. This
2475 structure will eventually be converted in one of the
2476 `elf_external_linux_*' structures and written out to an output bfd
2477 by one of the functions declared below. */
2479 struct elf_internal_linux_prpsinfo
2481 char pr_state; /* Numeric process state. */
2482 char pr_sname; /* Char for pr_state. */
2483 char pr_zomb; /* Zombie. */
2484 char pr_nice; /* Nice val. */
2485 unsigned long pr_flag; /* Flags. */
2486 unsigned int pr_uid;
2487 unsigned int pr_gid;
2488 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2489 char pr_fname[16 + 1]; /* Filename of executable. */
2490 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2493 /* Linux/most 32-bit archs. */
2494 extern char *elfcore_write_linux_prpsinfo32
2495 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2497 /* Linux/most 64-bit archs. */
2498 extern char *elfcore_write_linux_prpsinfo64
2499 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2501 /* Linux/PPC32 uses different layout compared to most archs. */
2502 extern char *elfcore_write_ppc_linux_prpsinfo32
2503 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2505 extern bfd *_bfd_elf32_bfd_from_remote_memory
2506 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2507 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2508 extern bfd *_bfd_elf64_bfd_from_remote_memory
2509 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2510 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2512 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2513 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2514 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2515 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2516 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2517 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2518 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2519 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2520 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2521 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2522 unsigned int, const char *);
2523 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2524 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2527 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2528 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2529 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2530 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2531 extern bfd_boolean _bfd_elf_merge_object_attributes
2532 (bfd *, struct bfd_link_info *);
2533 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2534 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2535 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2537 /* The linker may need to keep track of the number of relocs that it
2538 decides to copy as dynamic relocs in check_relocs for each symbol.
2539 This is so that it can later discard them if they are found to be
2540 unnecessary. We can store the information in a field extending the
2541 regular ELF linker hash table. */
2543 struct elf_dyn_relocs
2545 struct elf_dyn_relocs *next;
2547 /* The input section of the reloc. */
2550 /* Total number of relocs copied for the input section. */
2551 bfd_size_type count;
2553 /* Number of pc-relative relocs copied for the input section. */
2554 bfd_size_type pc_count;
2557 extern bfd_boolean _bfd_elf_create_ifunc_sections
2558 (bfd *, struct bfd_link_info *);
2559 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2560 (struct bfd_link_info *, struct elf_link_hash_entry *,
2561 struct elf_dyn_relocs **, bfd_boolean *, unsigned int,
2562 unsigned int, unsigned int, bfd_boolean);
2563 extern long _bfd_elf_ifunc_get_synthetic_symtab
2564 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
2565 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
2567 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2568 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2570 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2571 extern bfd_vma elf64_r_sym (bfd_vma);
2572 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2573 extern bfd_vma elf32_r_sym (bfd_vma);
2575 /* Large common section. */
2576 extern asection _bfd_elf_large_com_section;
2578 /* Hash for local symbol with the first section id, ID, in the input
2579 file and the local symbol index, SYM. */
2580 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2581 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2582 ^ (SYM) ^ ((ID) >> 16))
2584 /* This is the condition under which finish_dynamic_symbol will be called.
2585 If our finish_dynamic_symbol isn't called, we'll need to do something
2586 about initializing any .plt and .got entries in relocate_section. */
2587 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2589 && ((SHARED) || !(H)->forced_local) \
2590 && ((H)->dynindx != -1 || (H)->forced_local))
2592 /* This macro is to avoid lots of duplicated code in the body
2593 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2594 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2595 r_symndx, symtab_hdr, sym_hashes, \
2596 h, sec, relocation, \
2597 unresolved_reloc, warned, ignored) \
2600 /* It seems this can happen with erroneous or unsupported \
2601 input (mixing a.out and elf in an archive, for example.) */ \
2602 if (sym_hashes == NULL) \
2605 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2607 if (info->wrap_hash != NULL \
2608 && (input_section->flags & SEC_DEBUGGING) != 0) \
2609 h = ((struct elf_link_hash_entry *) \
2610 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2612 while (h->root.type == bfd_link_hash_indirect \
2613 || h->root.type == bfd_link_hash_warning) \
2614 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2618 unresolved_reloc = FALSE; \
2620 if (h->root.type == bfd_link_hash_defined \
2621 || h->root.type == bfd_link_hash_defweak) \
2623 sec = h->root.u.def.section; \
2625 || sec->output_section == NULL) \
2626 /* Set a flag that will be cleared later if we find a \
2627 relocation value for this symbol. output_section \
2628 is typically NULL for symbols satisfied by a shared \
2630 unresolved_reloc = TRUE; \
2632 relocation = (h->root.u.def.value \
2633 + sec->output_section->vma \
2634 + sec->output_offset); \
2636 else if (h->root.type == bfd_link_hash_undefweak) \
2638 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2639 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2641 else if (!bfd_link_relocatable (info)) \
2644 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2645 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2646 (*info->callbacks->undefined_symbol) (info, \
2647 h->root.root.string, \
2650 rel->r_offset, err); \
2653 (void) unresolved_reloc; \
2659 /* This macro is to avoid lots of duplicated code in the body of the
2660 loop over relocations in xxx_relocate_section() in the various
2663 Handle relocations against symbols from removed linkonce sections,
2664 or sections discarded by a linker script. When doing a relocatable
2665 link, we remove such relocations. Otherwise, we just want the
2666 section contents zeroed and avoid any special processing. */
2667 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2668 rel, count, relend, \
2669 howto, index, contents) \
2672 _bfd_clear_contents (howto, input_bfd, input_section, \
2673 contents + rel[index].r_offset); \
2675 if (bfd_link_relocatable (info) \
2676 && (input_section->flags & SEC_DEBUGGING)) \
2678 /* Only remove relocations in debug sections since other \
2679 sections may require relocations. */ \
2680 Elf_Internal_Shdr *rel_hdr; \
2682 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2684 /* Avoid empty output section. */ \
2685 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2687 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2688 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2689 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2691 memmove (rel, rel + count, \
2692 (relend - rel - count) * sizeof (*rel)); \
2694 input_section->reloc_count--; \
2701 for (i_ = 0; i_ < count; i_++) \
2703 rel[i_].r_info = 0; \
2704 rel[i_].r_addend = 0; \
2710 /* Will a symbol be bound to the definition within the shared
2711 library, if any. A unique symbol can never be bound locally. */
2712 #define SYMBOLIC_BIND(INFO, H) \
2713 (!(H)->unique_global \
2714 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2719 #endif /* _LIBELF_H_ */