1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2019 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;
216 /* Symbol is __start_SECNAME or __stop_SECNAME to mark section
218 unsigned int start_stop : 1;
219 /* Symbol is or was a weak defined symbol from a dynamic object with
220 a strong defined symbol alias. U.ALIAS points to a list of aliases,
221 the definition having is_weakalias clear. */
222 unsigned int is_weakalias : 1;
224 /* String table index in .dynstr if this is a dynamic symbol. */
225 unsigned long dynstr_index;
229 /* Points to a circular list of non-function symbol aliases. */
230 struct elf_link_hash_entry *alias;
232 /* Hash value of the name computed using the ELF hash function.
233 Used part way through size_dynamic_sections, after we've finished
235 unsigned long elf_hash_value;
238 /* Version information. */
241 /* This field is used for a symbol which is not defined in a
242 regular object. It points to the version information read in
243 from the dynamic object. */
244 Elf_Internal_Verdef *verdef;
245 /* This field is used for a symbol which is defined in a regular
246 object. It is set up in size_dynamic_sections. It points to
247 the version information we should write out for this symbol. */
248 struct bfd_elf_version_tree *vertree;
253 /* For __start_SECNAME and __stop_SECNAME symbols, record the first
254 input section whose section name is SECNAME. */
255 asection *start_stop_section;
257 /* Vtable information. */
258 struct elf_link_virtual_table_entry *vtable;
262 /* Return the strong definition for a weak symbol with aliases. */
264 static inline struct elf_link_hash_entry *
265 weakdef (struct elf_link_hash_entry *h)
267 while (h->is_weakalias)
272 /* Will references to this symbol always reference the symbol
274 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
275 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
277 /* Will _calls_ to this symbol always call the version in this object? */
278 #define SYMBOL_CALLS_LOCAL(INFO, H) \
279 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
281 /* Whether an undefined weak symbol should resolve to its link-time
282 value, even in PIC or PIE objects. */
283 #define UNDEFWEAK_NO_DYNAMIC_RELOC(INFO, H) \
284 ((H)->root.type == bfd_link_hash_undefweak \
285 && (ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT \
286 || (INFO)->dynamic_undefined_weak == 0))
288 /* Common symbols that are turned into definitions don't have the
289 DEF_REGULAR flag set, so they might appear to be undefined.
290 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
291 #define ELF_COMMON_DEF_P(H) \
293 && !(H)->def_dynamic \
294 && (H)->root.type == bfd_link_hash_defined)
296 /* Records local symbols to be emitted in the dynamic symbol table. */
298 struct elf_link_local_dynamic_entry
300 struct elf_link_local_dynamic_entry *next;
302 /* The input bfd this symbol came from. */
305 /* The index of the local symbol being copied. */
308 /* The index in the outgoing dynamic symbol table. */
311 /* A copy of the input symbol. */
312 Elf_Internal_Sym isym;
315 struct elf_link_loaded_list
317 struct elf_link_loaded_list *next;
321 /* Structures used by the eh_frame optimization code. */
326 /* If REMOVED == 1, this is the CIE that the FDE originally used.
327 The CIE belongs to the same .eh_frame input section as the FDE.
329 If REMOVED == 0, this is the CIE that we have chosen to use for
330 the output FDE. The CIE's REMOVED field is also 0, but the CIE
331 might belong to a different .eh_frame input section from the FDE.
333 May be NULL to signify that the FDE should be discarded. */
334 struct eh_cie_fde *cie_inf;
335 struct eh_cie_fde *next_for_section;
338 /* CIEs have three states:
340 - REMOVED && !MERGED: Slated for removal because we haven't yet
341 proven that an FDE needs it. FULL_CIE, if nonnull, points to
342 more detailed information about the CIE.
344 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
345 which may not belong to the same input section.
347 - !REMOVED: We have decided to keep this CIE. SEC is the
348 .eh_frame input section that contains the CIE. */
350 struct cie *full_cie;
351 struct eh_cie_fde *merged_with;
355 /* The offset of the personality data from the start of the CIE,
356 or 0 if the CIE doesn't have any. */
357 unsigned int personality_offset : 8;
359 /* Length of augmentation. aug_str_len is the length of the
360 string including null terminator. aug_data_len is the length
361 of the rest up to the initial insns. */
362 unsigned int aug_str_len : 3;
363 unsigned int aug_data_len : 5;
365 /* True if we have marked relocations associated with this CIE. */
366 unsigned int gc_mark : 1;
368 /* True if we have decided to turn an absolute LSDA encoding into
369 a PC-relative one. */
370 unsigned int make_lsda_relative : 1;
372 /* True if we have decided to turn an absolute personality
373 encoding into a PC-relative one. */
374 unsigned int make_per_encoding_relative : 1;
376 /* True if the CIE contains personality data and if that
377 data uses a PC-relative encoding. Always true when
378 make_per_encoding_relative is. */
379 unsigned int per_encoding_relative : 1;
381 /* True if the CIE contains personality data aligned to a
382 multiple of eight bytes. */
383 unsigned int per_encoding_aligned8 : 1;
385 /* True if we need to add an 'R' (FDE encoding) entry to the
386 CIE's augmentation data. */
387 unsigned int add_fde_encoding : 1;
389 /* True if we have merged this CIE with another. */
390 unsigned int merged : 1;
393 unsigned int pad1 : 9;
396 unsigned int reloc_index;
399 unsigned int new_offset;
400 unsigned int fde_encoding : 8;
401 unsigned int lsda_encoding : 8;
402 unsigned int lsda_offset : 8;
404 /* True if this entry represents a CIE, false if it represents an FDE. */
405 unsigned int cie : 1;
407 /* True if this entry is currently marked for removal. */
408 unsigned int removed : 1;
410 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
411 augmentation data, and an associated byte to each of the CIE's FDEs. */
412 unsigned int add_augmentation_size : 1;
414 /* True if we have decided to convert absolute FDE relocations into
415 relative ones. This applies to the first relocation in the FDE,
416 which is against the code that the FDE describes. */
417 unsigned int make_relative : 1;
420 unsigned int pad1 : 4;
422 unsigned int *set_loc;
425 struct eh_frame_sec_info
429 struct eh_cie_fde entry[1];
432 struct eh_frame_array_ent
441 #define DWARF2_EH_HDR 1
442 #define COMPACT_EH_HDR 2
444 /* Endian-neutral code indicating that a function cannot be unwound. */
445 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
447 struct dwarf_eh_frame_hdr_info
450 unsigned int fde_count;
451 /* TRUE if .eh_frame_hdr should contain the sorted search table.
452 We build it if we successfully read all .eh_frame input sections
453 and recognize them. */
455 struct eh_frame_array_ent *array;
458 struct compact_eh_frame_hdr_info
460 unsigned int allocated_entries;
461 /* eh_frame_entry fragments. */
465 struct eh_frame_hdr_info
468 unsigned int array_count;
469 bfd_boolean frame_hdr_is_compact;
472 struct dwarf_eh_frame_hdr_info dwarf;
473 struct compact_eh_frame_hdr_info compact;
478 /* Enum used to identify target specific extensions to the elf_obj_tdata
479 and elf_link_hash_table structures. Note the enums deliberately start
480 from 1 so that we can detect an uninitialized field. The generic value
481 is last so that additions to this enum do not need to modify more than
485 AARCH64_ELF_DATA = 1,
525 struct elf_sym_strtab
527 Elf_Internal_Sym sym;
528 unsigned long dest_index;
529 unsigned long destshndx_index;
532 /* ELF linker hash table. */
534 struct elf_link_hash_table
536 struct bfd_link_hash_table root;
538 /* An identifier used to distinguish different target
539 specific extensions to this structure. */
540 enum elf_target_id hash_table_id;
542 /* Whether we have created the special dynamic sections required
543 when linking against or generating a shared object. */
544 bfd_boolean dynamic_sections_created;
546 /* Whether dynamic relocations are present. */
547 bfd_boolean dynamic_relocs;
549 /* True if this target has relocatable executables, so needs dynamic
551 bfd_boolean is_relocatable_executable;
553 /* The BFD used to hold special sections created by the linker.
554 This will be the first BFD found which requires these sections to
558 /* The value to use when initialising got.refcount/offset and
559 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
560 the values are refcounts. Set to init_got_offset/init_plt_offset
561 in size_dynamic_sections when the values may be offsets. */
562 union gotplt_union init_got_refcount;
563 union gotplt_union init_plt_refcount;
565 /* The value to use for got.refcount/offset and plt.refcount/offset
566 when the values may be offsets. Normally (bfd_vma) -1. */
567 union gotplt_union init_got_offset;
568 union gotplt_union init_plt_offset;
570 /* The number of symbols found in the link which is intended for the
571 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */
572 bfd_size_type dynsymcount;
573 bfd_size_type local_dynsymcount;
575 /* The string table of dynamic symbols, which becomes the .dynstr
577 struct elf_strtab_hash *dynstr;
579 /* The number of symbol strings found in the link which must be put
580 into the .strtab section. */
581 bfd_size_type strtabcount;
583 /* The array size of the symbol string table, which becomes the
585 bfd_size_type strtabsize;
587 /* The array of strings, which becomes the .strtab section. */
588 struct elf_sym_strtab *strtab;
590 /* The number of buckets in the hash table in the .hash section.
591 This is based on the number of dynamic symbols. */
592 bfd_size_type bucketcount;
594 /* A linked list of DT_NEEDED names found in dynamic objects
595 included in the link. */
596 struct bfd_link_needed_list *needed;
598 /* Sections in the output bfd that provides a section symbol
599 to be used by relocations emitted against local symbols.
600 Most targets will not use data_index_section. */
601 asection *text_index_section;
602 asection *data_index_section;
604 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
605 struct elf_link_hash_entry *hgot;
607 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
608 struct elf_link_hash_entry *hplt;
610 /* The _DYNAMIC symbol. */
611 struct elf_link_hash_entry *hdynamic;
613 /* A pointer to information used to merge SEC_MERGE sections. */
616 /* Used to link stabs in sections. */
617 struct stab_info stab_info;
619 /* Used by eh_frame code when editing .eh_frame. */
620 struct eh_frame_hdr_info eh_info;
622 /* A linked list of local symbols to be added to .dynsym. */
623 struct elf_link_local_dynamic_entry *dynlocal;
625 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
626 objects included in the link. */
627 struct bfd_link_needed_list *runpath;
629 /* Cached first output tls section and size of PT_TLS segment. */
631 bfd_size_type tls_size;
633 /* A linked list of BFD's loaded in the link. */
634 struct elf_link_loaded_list *loaded;
636 /* Short-cuts to get to dynamic linker sections. */
645 asection *sreldynrelro;
653 /* Look up an entry in an ELF linker hash table. */
655 #define elf_link_hash_lookup(table, string, create, copy, follow) \
656 ((struct elf_link_hash_entry *) \
657 bfd_link_hash_lookup (&(table)->root, (string), (create), \
660 /* Traverse an ELF linker hash table. */
662 #define elf_link_hash_traverse(table, func, info) \
663 (bfd_link_hash_traverse \
665 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
668 /* Get the ELF linker hash table from a link_info structure. */
670 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
672 #define elf_hash_table_id(table) ((table) -> hash_table_id)
674 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
675 #define is_elf_hash_table(htab) \
676 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
678 /* Used by bfd_sym_from_r_symndx to cache a small number of local
680 #define LOCAL_SYM_CACHE_SIZE 32
684 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
685 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
688 /* Constant information held for an ELF backend. */
690 struct elf_size_info {
691 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
692 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
694 /* The size of entries in the .hash section. */
695 unsigned char sizeof_hash_entry;
697 /* The number of internal relocations to allocate per external
699 unsigned char int_rels_per_ext_rel;
700 /* We use some fixed size arrays. This should be large enough to
701 handle all back-ends. */
702 #define MAX_INT_RELS_PER_EXT_REL 3
704 unsigned char arch_size, log_file_align;
705 unsigned char elfclass, ev_current;
706 int (*write_out_phdrs)
707 (bfd *, const Elf_Internal_Phdr *, unsigned int);
709 (*write_shdrs_and_ehdr) (bfd *);
710 bfd_boolean (*checksum_contents)
711 (bfd * , void (*) (const void *, size_t, void *), void *);
713 (bfd *, asection *, void *);
714 bfd_boolean (*swap_symbol_in)
715 (bfd *, const void *, const void *, Elf_Internal_Sym *);
716 void (*swap_symbol_out)
717 (bfd *, const Elf_Internal_Sym *, void *, void *);
718 bfd_boolean (*slurp_reloc_table)
719 (bfd *, asection *, asymbol **, bfd_boolean);
720 long (*slurp_symbol_table)
721 (bfd *, asymbol **, bfd_boolean);
723 (bfd *, const void *, Elf_Internal_Dyn *);
725 (bfd *, const Elf_Internal_Dyn *, void *);
727 /* This function is called to swap in a REL relocation. If an
728 external relocation corresponds to more than one internal
729 relocation, then all relocations are swapped in at once. */
730 void (*swap_reloc_in)
731 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
733 /* This function is called to swap out a REL relocation. */
734 void (*swap_reloc_out)
735 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
737 /* This function is called to swap in a RELA relocation. If an
738 external relocation corresponds to more than one internal
739 relocation, then all relocations are swapped in at once. */
740 void (*swap_reloca_in)
741 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
743 /* This function is called to swap out a RELA relocation. */
744 void (*swap_reloca_out)
745 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
748 #define elf_symbol_from(ABFD,S) \
749 (((S)->the_bfd != NULL \
750 && (S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
751 && (S)->the_bfd->tdata.elf_obj_data != 0) \
752 ? (elf_symbol_type *) (S) \
755 enum elf_reloc_type_class {
757 reloc_class_relative,
763 struct elf_reloc_cookie
765 Elf_Internal_Rela *rels, *rel, *relend;
766 Elf_Internal_Sym *locsyms;
770 struct elf_link_hash_entry **sym_hashes;
772 bfd_boolean bad_symtab;
775 /* The level of IRIX compatibility we're striving for. */
783 /* Mapping of ELF section names and types. */
784 struct bfd_elf_special_section
787 unsigned int prefix_length;
788 /* 0 means name must match PREFIX exactly.
789 -1 means name must start with PREFIX followed by an arbitrary string.
790 -2 means name must match PREFIX exactly or consist of PREFIX followed
791 by a dot then anything.
792 > 0 means name must start with the first PREFIX_LENGTH chars of
793 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
794 signed int suffix_length;
799 enum action_discarded
805 typedef asection * (*elf_gc_mark_hook_fn)
806 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
807 struct elf_link_hash_entry *, Elf_Internal_Sym *);
809 enum elf_property_kind
811 /* A new property. */
812 property_unknown = 0,
813 /* A property ignored by backend. */
815 /* A corrupt property reported by backend. */
817 /* A property should be removed due to property merge. */
819 /* A property which is a number. */
823 typedef struct elf_property
825 unsigned int pr_type;
826 unsigned int pr_datasz;
829 /* For property_number, this is a number. */
831 /* Add a new one if elf_property_kind is updated. */
833 enum elf_property_kind pr_kind;
836 typedef struct elf_property_list
838 struct elf_property_list *next;
839 struct elf_property property;
842 struct bfd_elf_section_reloc_data;
844 struct elf_backend_data
846 /* The architecture for this backend. */
847 enum bfd_architecture arch;
849 /* An identifier used to distinguish different target specific
850 extensions to elf_obj_tdata and elf_link_hash_table structures. */
851 enum elf_target_id target_id;
853 /* The ELF machine code (EM_xxxx) for this backend. */
854 int elf_machine_code;
859 /* The maximum page size for this backend. */
862 /* The minimum page size for this backend. An input object will not be
863 considered page aligned unless its sections are correctly aligned for
864 pages at least this large. May be smaller than maxpagesize. */
867 /* The common page size for this backend. */
868 bfd_vma commonpagesize;
870 /* The value of commonpagesize to use when -z relro for this backend. */
871 bfd_vma relropagesize;
873 /* The BFD flags applied to sections created for dynamic linking. */
874 flagword dynamic_sec_flags;
876 /* Architecture-specific data for this backend.
877 This is actually a pointer to some type like struct elf_ARCH_data. */
878 const void *arch_data;
880 /* A function to translate an ELF RELA relocation to a BFD arelent
881 structure. Returns TRUE upon success, FALSE otherwise. */
882 bfd_boolean (*elf_info_to_howto)
883 (bfd *, arelent *, Elf_Internal_Rela *);
885 /* A function to translate an ELF REL relocation to a BFD arelent
886 structure. Returns TRUE upon success, FALSE otherwise. */
887 bfd_boolean (*elf_info_to_howto_rel)
888 (bfd *, arelent *, Elf_Internal_Rela *);
890 /* A function to determine whether a symbol is global when
891 partitioning the symbol table into local and global symbols.
892 This should be NULL for most targets, in which case the correct
893 thing will be done. MIPS ELF, at least on the Irix 5, has
894 special requirements. */
895 bfd_boolean (*elf_backend_sym_is_global)
898 /* The remaining functions are hooks which are called only if they
901 /* A function to permit a backend specific check on whether a
902 particular BFD format is relevant for an object file, and to
903 permit the backend to set any global information it wishes. When
904 this is called elf_elfheader is set, but anything else should be
905 used with caution. If this returns FALSE, the check_format
906 routine will return a bfd_error_wrong_format error. */
907 bfd_boolean (*elf_backend_object_p)
910 /* A function to do additional symbol processing when reading the
911 ELF symbol table. This is where any processor-specific special
912 section indices are handled. */
913 void (*elf_backend_symbol_processing)
916 /* A function to do additional symbol processing after reading the
917 entire ELF symbol table. */
918 bfd_boolean (*elf_backend_symbol_table_processing)
919 (bfd *, elf_symbol_type *, unsigned int);
921 /* A function to set the type of the info field. Processor-specific
922 types should be handled here. */
923 int (*elf_backend_get_symbol_type)
924 (Elf_Internal_Sym *, int);
926 /* A function to return the linker hash table entry of a symbol that
927 might be satisfied by an archive symbol. */
928 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
929 (bfd *, struct bfd_link_info *, const char *);
931 /* Return true if local section symbols should have a non-null st_name.
932 NULL implies false. */
933 bfd_boolean (*elf_backend_name_local_section_symbols)
936 /* A function to do additional processing on the ELF section header
937 just before writing it out. This is used to set the flags and
938 type fields for some sections, or to actually write out data for
940 bfd_boolean (*elf_backend_section_processing)
941 (bfd *, Elf_Internal_Shdr *);
943 /* A function to handle unusual section types when creating BFD
944 sections from ELF sections. */
945 bfd_boolean (*elf_backend_section_from_shdr)
946 (bfd *, Elf_Internal_Shdr *, const char *, int);
948 /* A function to convert machine dependent ELF section header flags to
949 BFD internal section header flags. */
950 bfd_boolean (*elf_backend_section_flags)
951 (flagword *, const Elf_Internal_Shdr *);
953 /* A function that returns a struct containing ELF section flags and
954 type for the given BFD section. */
955 const struct bfd_elf_special_section * (*get_sec_type_attr)
958 /* A function to handle unusual program segment types when creating BFD
959 sections from ELF program segments. */
960 bfd_boolean (*elf_backend_section_from_phdr)
961 (bfd *, Elf_Internal_Phdr *, int, const char *);
963 /* A function to set up the ELF section header for a BFD section in
964 preparation for writing it out. This is where the flags and type
965 fields are set for unusual sections. */
966 bfd_boolean (*elf_backend_fake_sections)
967 (bfd *, Elf_Internal_Shdr *, asection *);
969 /* A function to get the ELF section index for a BFD section. If
970 this returns TRUE, the section was found. If it is a normal ELF
971 section, *RETVAL should be left unchanged. If it is not a normal
972 ELF section *RETVAL should be set to the SHN_xxxx index. */
973 bfd_boolean (*elf_backend_section_from_bfd_section)
974 (bfd *, asection *, int *retval);
976 /* If this field is not NULL, it is called by the add_symbols phase
977 of a link just before adding a symbol to the global linker hash
978 table. It may modify any of the fields as it wishes. If *NAME
979 is set to NULL, the symbol will be skipped rather than being
980 added to the hash table. This function is responsible for
981 handling all processor dependent symbol bindings and section
982 indices, and must set at least *FLAGS and *SEC for each processor
983 dependent case; failure to do so will cause a link error. */
984 bfd_boolean (*elf_add_symbol_hook)
985 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
986 const char **name, flagword *flags, asection **sec, bfd_vma *value);
988 /* If this field is not NULL, it is called by the elf_link_output_sym
989 phase of a link for each symbol which will appear in the object file.
990 On error, this function returns 0. 1 is returned when the symbol
991 should be output, 2 is returned when the symbol should be discarded. */
992 int (*elf_backend_link_output_symbol_hook)
993 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
994 asection *, struct elf_link_hash_entry *);
996 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
997 linker the first time it encounters a dynamic object in the link.
998 This function must create any sections required for dynamic
999 linking. The ABFD argument is a dynamic object. The .interp,
1000 .dynamic, .dynsym, .dynstr, and .hash functions have already been
1001 created, and this function may modify the section flags if
1002 desired. This function will normally create the .got and .plt
1003 sections, but different backends have different requirements. */
1004 bfd_boolean (*elf_backend_create_dynamic_sections)
1005 (bfd *abfd, struct bfd_link_info *info);
1007 /* When creating a shared library, determine whether to omit the
1008 dynamic symbol for the section. */
1009 bfd_boolean (*elf_backend_omit_section_dynsym)
1010 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
1012 /* Return TRUE if relocations of targets are compatible to the extent
1013 that CHECK_RELOCS will properly process them. PR 4424. */
1014 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
1016 /* The CHECK_RELOCS function is called by the add_symbols phase of
1017 the ELF backend linker. It is called once for each section with
1018 relocs of an object file, just after the symbols for the object
1019 file have been added to the global linker hash table. The
1020 function must look through the relocs and do any special handling
1021 required. This generally means allocating space in the global
1022 offset table, and perhaps allocating space for a reloc. The
1023 relocs are always passed as Rela structures; if the section
1024 actually uses Rel structures, the r_addend field will always be
1026 bfd_boolean (*check_relocs)
1027 (bfd *abfd, struct bfd_link_info *info, asection *o,
1028 const Elf_Internal_Rela *relocs);
1030 /* The CHECK_DIRECTIVES function is called once per input file by
1031 the add_symbols phase of the ELF backend linker. The function
1032 must inspect the bfd and create any additional symbols according
1033 to any custom directives in the bfd. */
1034 bfd_boolean (*check_directives)
1035 (bfd *abfd, struct bfd_link_info *info);
1037 /* The NOTICE_AS_NEEDED function is called as the linker is about to
1038 handle an as-needed lib (ACT = notice_as_needed), and after the
1039 linker has decided to keep the lib (ACT = notice_needed) or when
1040 the lib is not needed (ACT = notice_not_needed). */
1041 bfd_boolean (*notice_as_needed)
1042 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
1044 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
1045 linker for every symbol which is defined by a dynamic object and
1046 referenced by a regular object. This is called after all the
1047 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
1048 function has been called. The hash table entry should be
1049 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
1050 defined in a section from a dynamic object. Dynamic object
1051 sections are not included in the final link, and this function is
1052 responsible for changing the value to something which the rest of
1053 the link can deal with. This will normally involve adding an
1054 entry to the .plt or .got or some such section, and setting the
1055 symbol to point to that. */
1056 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
1057 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
1059 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
1060 after all the linker input files have been seen but before the
1061 section sizes have been set. This is called after
1062 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
1063 bfd_boolean (*elf_backend_always_size_sections)
1064 (bfd *output_bfd, struct bfd_link_info *info);
1066 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
1067 linker after all the linker input files have been seen but before
1068 the sections sizes have been set. This is called after
1069 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
1070 It is only called when linking against a dynamic object. It must
1071 set the sizes of the dynamic sections, and may fill in their
1072 contents as well. The generic ELF linker can handle the .dynsym,
1073 .dynstr and .hash sections. This function must handle the
1074 .interp section and any sections created by the
1075 CREATE_DYNAMIC_SECTIONS entry point. */
1076 bfd_boolean (*elf_backend_size_dynamic_sections)
1077 (bfd *output_bfd, struct bfd_link_info *info);
1079 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
1080 we keep to use as a base for relocs and symbols. */
1081 void (*elf_backend_init_index_section)
1082 (bfd *output_bfd, struct bfd_link_info *info);
1084 /* The RELOCATE_SECTION function is called by the ELF backend linker
1085 to handle the relocations for a section.
1087 The relocs are always passed as Rela structures; if the section
1088 actually uses Rel structures, the r_addend field will always be
1091 This function is responsible for adjust the section contents as
1092 necessary, and (if using Rela relocs and generating a
1093 relocatable output file) adjusting the reloc addend as
1096 This function does not have to worry about setting the reloc
1097 address or the reloc symbol index.
1099 LOCAL_SYMS is a pointer to the swapped in local symbols.
1101 LOCAL_SECTIONS is an array giving the section in the input file
1102 corresponding to the st_shndx field of each local symbol.
1104 The global hash table entry for the global symbols can be found
1105 via elf_sym_hashes (input_bfd).
1107 When generating relocatable output, this function must handle
1108 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1109 going to be the section symbol corresponding to the output
1110 section, which means that the addend must be adjusted
1113 Returns FALSE on error, TRUE on success, 2 if successful and
1114 relocations should be written for this section. */
1115 int (*elf_backend_relocate_section)
1116 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1117 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1118 Elf_Internal_Sym *local_syms, asection **local_sections);
1120 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1121 linker just before it writes a symbol out to the .dynsym section.
1122 The processor backend may make any required adjustment to the
1123 symbol. It may also take the opportunity to set contents of the
1124 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1125 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1126 on those symbols which are defined by a dynamic object. */
1127 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1128 (bfd *output_bfd, struct bfd_link_info *info,
1129 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1131 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1132 linker just before it writes all the dynamic sections out to the
1133 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1134 all dynamic symbols. */
1135 bfd_boolean (*elf_backend_finish_dynamic_sections)
1136 (bfd *output_bfd, struct bfd_link_info *info);
1138 /* A function to do any beginning processing needed for the ELF file
1139 before building the ELF headers and computing file positions. */
1140 void (*elf_backend_begin_write_processing)
1141 (bfd *, struct bfd_link_info *);
1143 /* A function to do any final processing needed for the ELF file
1144 before writing it out. */
1145 bfd_boolean (*elf_backend_final_write_processing)
1148 /* This function is called by get_program_header_size. It should
1149 return the number of additional program segments which this BFD
1150 will need. It should return -1 on error. */
1151 int (*elf_backend_additional_program_headers)
1152 (bfd *, struct bfd_link_info *);
1154 /* This function is called to modify an existing segment map in a
1155 backend specific fashion. */
1156 bfd_boolean (*elf_backend_modify_segment_map)
1157 (bfd *, struct bfd_link_info *);
1159 /* This function is called to modify program headers just before
1160 they are written. */
1161 bfd_boolean (*elf_backend_modify_program_headers)
1162 (bfd *, struct bfd_link_info *);
1164 /* This function is called to see if the PHDR header should be
1165 checked for validity. */
1166 bfd_boolean (*elf_backend_allow_non_load_phdr)
1167 (bfd *, const Elf_Internal_Phdr *, unsigned);
1169 /* This function is called before section garbage collection to
1170 mark entry symbol sections. */
1172 (struct bfd_link_info *);
1174 /* This function is called during section garbage collection to
1175 mark sections that define global symbols. */
1176 bfd_boolean (*gc_mark_dynamic_ref)
1177 (struct elf_link_hash_entry *, void *);
1179 /* This function is called during section gc to discover the section a
1180 particular relocation refers to. */
1181 elf_gc_mark_hook_fn gc_mark_hook;
1183 /* This function, if defined, is called after the first gc marking pass
1184 to allow the backend to mark additional sections. */
1185 bfd_boolean (*gc_mark_extra_sections)
1186 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1188 /* This function, if defined, is called after the ELF headers have
1189 been created. This allows for things like the OS and ABI versions
1191 void (*elf_backend_post_process_headers)
1192 (bfd *, struct bfd_link_info *);
1194 /* This function, if defined, prints a symbol to file and returns the
1195 name of the symbol to be printed. It should return NULL to fall
1196 back to default symbol printing. */
1197 const char *(*elf_backend_print_symbol_all)
1198 (bfd *, void *, asymbol *);
1200 /* This function, if defined, is called after all local symbols and
1201 global symbols converted to locals are emitted into the symtab
1202 section. It allows the backend to emit special local symbols
1203 not handled in the hash table. */
1204 bfd_boolean (*elf_backend_output_arch_local_syms)
1205 (bfd *, struct bfd_link_info *, void *,
1206 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1207 struct elf_link_hash_entry *));
1209 /* This function, if defined, is called after all symbols are emitted
1210 into the symtab section. It allows the backend to emit special
1211 global symbols not handled in the hash table. */
1212 bfd_boolean (*elf_backend_output_arch_syms)
1213 (bfd *, struct bfd_link_info *, void *,
1214 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1215 struct elf_link_hash_entry *));
1217 /* Filter what symbols of the output file to include in the import
1218 library if one is created. */
1219 unsigned int (*elf_backend_filter_implib_symbols)
1220 (bfd *, struct bfd_link_info *, asymbol **, long);
1222 /* Copy any information related to dynamic linking from a pre-existing
1223 symbol to a newly created symbol. Also called to copy flags and
1224 other back-end info to a weakdef, in which case the symbol is not
1225 newly created and plt/got refcounts and dynamic indices should not
1227 void (*elf_backend_copy_indirect_symbol)
1228 (struct bfd_link_info *, struct elf_link_hash_entry *,
1229 struct elf_link_hash_entry *);
1231 /* Modify any information related to dynamic linking such that the
1232 symbol is not exported. */
1233 void (*elf_backend_hide_symbol)
1234 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1236 /* A function to do additional symbol fixup, called by
1237 _bfd_elf_fix_symbol_flags. */
1238 bfd_boolean (*elf_backend_fixup_symbol)
1239 (struct bfd_link_info *, struct elf_link_hash_entry *);
1241 /* Merge the backend specific symbol attribute. */
1242 void (*elf_backend_merge_symbol_attribute)
1243 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1246 /* This function, if defined, will return a string containing the
1247 name of a target-specific dynamic tag. */
1248 char *(*elf_backend_get_target_dtag)
1251 /* Decide whether an undefined symbol is special and can be ignored.
1252 This is the case for OPTIONAL symbols on IRIX. */
1253 bfd_boolean (*elf_backend_ignore_undef_symbol)
1254 (struct elf_link_hash_entry *);
1256 /* Emit relocations. Overrides default routine for emitting relocs,
1257 except during a relocatable link, or if all relocs are being emitted. */
1258 bfd_boolean (*elf_backend_emit_relocs)
1259 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1260 struct elf_link_hash_entry **);
1262 /* Update relocations. It is allowed to change the number and the order.
1263 In such a case hashes should be invalidated. */
1264 void (*elf_backend_update_relocs)
1265 (asection *, struct bfd_elf_section_reloc_data *);
1267 /* Count relocations. Not called for relocatable links
1268 or if all relocs are being preserved in the output. */
1269 unsigned int (*elf_backend_count_relocs)
1270 (struct bfd_link_info *, asection *);
1272 /* Count additionals relocations. Called for relocatable links if
1273 additional relocations needs to be created. */
1274 unsigned int (*elf_backend_count_additional_relocs)
1277 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1278 by r_offset. If NULL, default to true. */
1279 bfd_boolean (*sort_relocs_p)
1282 /* This function, if defined, is called when an NT_PRSTATUS note is found
1284 bfd_boolean (*elf_backend_grok_prstatus)
1285 (bfd *, Elf_Internal_Note *);
1287 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1288 note is found in a core file. */
1289 bfd_boolean (*elf_backend_grok_psinfo)
1290 (bfd *, Elf_Internal_Note *);
1292 /* This function, if defined, is called when a "FreeBSD" NT_PRSTATUS
1293 note is found in a core file. */
1294 bfd_boolean (*elf_backend_grok_freebsd_prstatus)
1295 (bfd *, Elf_Internal_Note *);
1297 /* This function, if defined, is called to write a note to a corefile. */
1298 char *(*elf_backend_write_core_note)
1299 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1301 /* This function, if defined, is called to convert target-specific
1302 section flag names into hex values. */
1303 flagword (*elf_backend_lookup_section_flags_hook)
1306 /* This function returns class of a reloc type. */
1307 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1308 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1310 /* This function, if defined, removes information about discarded functions
1311 from other sections which mention them. */
1312 bfd_boolean (*elf_backend_discard_info)
1313 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1315 /* This function, if defined, signals that the function above has removed
1316 the discarded relocations for this section. */
1317 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1320 /* What to do when ld finds relocations against symbols defined in
1321 discarded sections. */
1322 unsigned int (*action_discarded)
1325 /* This function returns the width of FDE pointers in bytes, or 0 if
1326 that can't be determined for some reason. The default definition
1327 goes by the bfd's EI_CLASS. */
1328 unsigned int (*elf_backend_eh_frame_address_size)
1329 (bfd *, const asection *);
1331 /* These functions tell elf-eh-frame whether to attempt to turn
1332 absolute or lsda encodings into pc-relative ones. The default
1333 definition enables these transformations. */
1334 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1335 (bfd *, struct bfd_link_info *, asection *);
1336 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1337 (bfd *, struct bfd_link_info *, asection *);
1339 /* This function returns an encoding after computing the encoded
1340 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1341 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1342 The default definition chooses a 32-bit PC-relative encoding. */
1343 bfd_byte (*elf_backend_encode_eh_address)
1344 (bfd *abfd, struct bfd_link_info *info,
1345 asection *osec, bfd_vma offset,
1346 asection *loc_sec, bfd_vma loc_offset,
1349 /* This function, if defined, may write out the given section.
1350 Returns TRUE if it did so and FALSE if the caller should. */
1351 bfd_boolean (*elf_backend_write_section)
1352 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1354 /* The level of IRIX compatibility we're striving for.
1355 MIPS ELF specific function. */
1356 irix_compat_t (*elf_backend_mips_irix_compat)
1359 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1360 (bfd *, unsigned int, bfd_boolean);
1362 /* The swapping table to use when dealing with ECOFF information.
1363 Used for the MIPS ELF .mdebug section. */
1364 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1366 /* This function implements `bfd_elf_bfd_from_remote_memory';
1367 see elf.c, elfcode.h. */
1368 bfd *(*elf_backend_bfd_from_remote_memory)
1369 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1370 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1371 bfd_size_type len));
1373 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1375 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1377 /* Is symbol defined in common section? */
1378 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1380 /* Return a common section index for section. */
1381 unsigned int (*common_section_index) (asection *);
1383 /* Return a common section for section. */
1384 asection *(*common_section) (asection *);
1386 /* Return TRUE if we can merge 2 definitions. */
1387 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1388 const Elf_Internal_Sym *, asection **,
1389 bfd_boolean, bfd_boolean,
1390 bfd *, const asection *);
1392 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1393 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1395 /* If non-NULL, called to register the location of XLAT_LOC within
1396 .MIPS.xhash at which real final dynindx for H will be written.
1397 If XLAT_LOC is zero, the symbol is not included in
1398 .MIPS.xhash and no dynindx will be written. */
1399 void (*record_xhash_symbol)
1400 (struct elf_link_hash_entry *h, bfd_vma xlat_loc);
1402 /* Return TRUE if type is a function symbol type. */
1403 bfd_boolean (*is_function_type) (unsigned int type);
1405 /* If the ELF symbol SYM might be a function in SEC, return the
1406 function size and set *CODE_OFF to the function's entry point,
1407 otherwise return zero. */
1408 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1411 /* Given NAME, the name of a relocation section stripped of its
1412 .rel/.rela prefix, return the section in ABFD to which the
1413 relocations apply. */
1414 asection *(*get_reloc_section) (bfd *abfd, const char *name);
1416 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
1417 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised,
1418 FALSE otherwise. Can be called multiple times for a given section,
1419 until it returns TRUE. Most of the times it is called ISECTION will be
1420 set to an input section that might be associated with the output section.
1421 The last time that it is called, ISECTION will be set to NULL. */
1422 bfd_boolean (*elf_backend_copy_special_section_fields)
1423 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection,
1424 Elf_Internal_Shdr *osection);
1426 /* Used to handle bad SHF_LINK_ORDER input. */
1427 void (*link_order_error_handler) (const char *, ...);
1429 /* Name of the PLT relocation section. */
1430 const char *relplt_name;
1432 /* Alternate EM_xxxx machine codes for this backend. */
1433 int elf_machine_alt1;
1434 int elf_machine_alt2;
1436 const struct elf_size_info *s;
1438 /* An array of target specific special sections. */
1439 const struct bfd_elf_special_section *special_sections;
1441 /* The size in bytes of the header for the GOT. This includes the
1442 so-called reserved entries on some systems. */
1443 bfd_vma got_header_size;
1445 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1446 otherwise by the local symbol with index SYMNDX in IBFD. */
1447 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1448 struct elf_link_hash_entry *h,
1449 bfd *ibfd, unsigned long symndx);
1451 /* The vendor name to use for a processor-standard attributes section. */
1452 const char *obj_attrs_vendor;
1454 /* The section name to use for a processor-standard attributes section. */
1455 const char *obj_attrs_section;
1457 /* Return 1, 2 or 3 to indicate what type of arguments a
1458 processor-specific tag takes. */
1459 int (*obj_attrs_arg_type) (int);
1461 /* The section type to use for an attributes section. */
1462 unsigned int obj_attrs_section_type;
1464 /* This function determines the order in which any attributes are
1465 written. It must be defined for input in the range
1466 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1467 is used in order to make unity easy). The returned value is the
1468 actual tag number to place in the input position. */
1469 int (*obj_attrs_order) (int);
1471 /* Handle merging unknown attributes; either warn and return TRUE,
1472 or give an error and return FALSE. */
1473 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1475 /* Parse GNU properties. Return the property kind. If the property
1476 is corrupt, issue an error message and return property_corrupt. */
1477 enum elf_property_kind (*parse_gnu_properties) (bfd *, unsigned int,
1481 /* Merge GNU properties. Return TRUE if property is updated. */
1482 bfd_boolean (*merge_gnu_properties) (struct bfd_link_info *, bfd *, bfd *,
1483 elf_property *, elf_property *);
1485 /* Set up GNU properties. */
1486 bfd *(*setup_gnu_properties) (struct bfd_link_info *);
1488 /* Fix up GNU properties. */
1489 void (*fixup_gnu_properties) (struct bfd_link_info *,
1490 elf_property_list **);
1492 /* Encoding used for compact EH tables. */
1493 int (*compact_eh_encoding) (struct bfd_link_info *);
1495 /* Opcode representing no unwind. */
1496 int (*cant_unwind_opcode) (struct bfd_link_info *);
1498 /* This is non-zero if static TLS segments require a special alignment. */
1499 unsigned static_tls_alignment;
1501 /* Alignment for the PT_GNU_STACK segment. */
1502 unsigned stack_align;
1504 /* Flag bits to assign to a section of type SHT_STRTAB. */
1505 unsigned long elf_strtab_flags;
1507 /* This is TRUE if the linker should act like collect and gather
1508 global constructors and destructors by name. This is TRUE for
1509 MIPS ELF because the Irix 5 tools can not handle the .init
1511 unsigned collect : 1;
1513 /* This is TRUE if the linker should ignore changes to the type of a
1514 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1515 record undefined functions as STT_OBJECT although the definitions
1517 unsigned type_change_ok : 1;
1519 /* Whether the backend may use REL relocations. (Some backends use
1520 both REL and RELA relocations, and this flag is set for those
1522 unsigned may_use_rel_p : 1;
1524 /* Whether the backend may use RELA relocations. (Some backends use
1525 both REL and RELA relocations, and this flag is set for those
1527 unsigned may_use_rela_p : 1;
1529 /* Whether the default relocation type is RELA. If a backend with
1530 this flag set wants REL relocations for a particular section,
1531 it must note that explicitly. Similarly, if this flag is clear,
1532 and the backend wants RELA relocations for a particular
1534 unsigned default_use_rela_p : 1;
1536 /* True if PLT and copy relocations should be RELA by default. */
1537 unsigned rela_plts_and_copies_p : 1;
1539 /* Set if RELA relocations for a relocatable link can be handled by
1540 generic code. Backends that set this flag need do nothing in the
1541 backend relocate_section routine for relocatable linking. */
1542 unsigned rela_normal : 1;
1544 /* Set if DT_REL/DT_RELA/DT_RELSZ/DT_RELASZ should not include PLT
1546 unsigned dtrel_excludes_plt : 1;
1548 /* TRUE if addresses "naturally" sign extend. This is used when
1549 swapping in from Elf32 when BFD64. */
1550 unsigned sign_extend_vma : 1;
1552 unsigned want_got_plt : 1;
1553 unsigned plt_readonly : 1;
1554 unsigned want_plt_sym : 1;
1555 unsigned plt_not_loaded : 1;
1556 unsigned plt_alignment : 4;
1557 unsigned can_gc_sections : 1;
1558 unsigned can_refcount : 1;
1559 unsigned want_got_sym : 1;
1560 unsigned want_dynbss : 1;
1561 unsigned want_dynrelro : 1;
1563 /* Targets which do not support physical addressing often require
1564 that the p_paddr field in the section header to be set to zero.
1565 This field indicates whether this behavior is required. */
1566 unsigned want_p_paddr_set_to_zero : 1;
1568 /* Target has broken hardware and/or kernel that requires pages not
1569 to be mapped twice with different permissions. */
1570 unsigned no_page_alias : 1;
1572 /* True if an object file lacking a .note.GNU-stack section
1573 should be assumed to be requesting exec stack. At least one
1574 other file in the link needs to have a .note.GNU-stack section
1575 for a PT_GNU_STACK segment to be created. */
1576 unsigned default_execstack : 1;
1578 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1579 in length rather than sec->size in length, if sec->rawsize is
1580 non-zero and smaller than sec->size. */
1581 unsigned caches_rawsize : 1;
1583 /* Address of protected data defined in the shared library may be
1584 external, i.e., due to copy relocation. */
1585 unsigned extern_protected_data : 1;
1587 /* True if `_bfd_elf_link_renumber_dynsyms' must be called even for
1589 unsigned always_renumber_dynsyms : 1;
1591 /* True if the 32-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid'
1592 members use a 16-bit data type. */
1593 unsigned linux_prpsinfo32_ugid16 : 1;
1595 /* True if the 64-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid'
1596 members use a 16-bit data type. */
1597 unsigned linux_prpsinfo64_ugid16 : 1;
1600 /* Information about reloc sections associated with a bfd_elf_section_data
1602 struct bfd_elf_section_reloc_data
1604 /* The ELF header for the reloc section associated with this
1606 Elf_Internal_Shdr *hdr;
1607 /* The number of relocations currently assigned to HDR. */
1609 /* The ELF section number of the reloc section. Only used for an
1612 /* Used by the backend linker to store the symbol hash table entries
1613 associated with relocs against global symbols. */
1614 struct elf_link_hash_entry **hashes;
1617 /* Information stored for each BFD section in an ELF file. This
1618 structure is allocated by elf_new_section_hook. */
1620 struct bfd_elf_section_data
1622 /* The ELF header for this section. */
1623 Elf_Internal_Shdr this_hdr;
1625 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1626 struct flag_info *section_flag_info;
1628 /* Information about the REL and RELA reloc sections associated
1629 with this section, if any. */
1630 struct bfd_elf_section_reloc_data rel, rela;
1632 /* The ELF section number of this section. */
1635 /* Used by the backend linker when generating a shared library to
1636 record the dynamic symbol index for a section symbol
1637 corresponding to this section. A value of 0 means that there is
1638 no dynamic symbol for this section. */
1641 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1642 asection *linked_to;
1644 /* A pointer to the swapped relocs. If the section uses REL relocs,
1645 rather than RELA, all the r_addend fields will be zero. This
1646 pointer may be NULL. It is used by the backend linker. */
1647 Elf_Internal_Rela *relocs;
1649 /* A pointer to a linked list tracking dynamic relocs copied for
1653 /* A pointer to the bfd section used for dynamic relocs. */
1657 /* Group name, if this section is a member of a group. */
1660 /* Group signature sym, if this is the SHT_GROUP section. */
1661 struct bfd_symbol *id;
1664 /* For a member of a group, points to the SHT_GROUP section.
1665 NULL for the SHT_GROUP section itself and non-group sections. */
1666 asection *sec_group;
1668 /* A linked list of member sections in the group. Circular when used by
1669 the linker. For the SHT_GROUP section, points at first member. */
1670 asection *next_in_group;
1672 /* The FDEs associated with this section. The u.fde.next_in_section
1673 field acts as a chain pointer. */
1674 struct eh_cie_fde *fde_list;
1676 /* Link from a text section to its .eh_frame_entry section. */
1677 asection *eh_frame_entry;
1679 /* A pointer used for various section optimizations. */
1683 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1684 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1685 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1686 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1687 #define elf_section_info(sec) (elf_section_data(sec)->this_hdr.sh_info)
1688 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1689 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1690 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1691 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1692 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1693 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1695 #define xvec_get_elf_backend_data(xvec) \
1696 ((const struct elf_backend_data *) (xvec)->backend_data)
1698 #define get_elf_backend_data(abfd) \
1699 xvec_get_elf_backend_data ((abfd)->xvec)
1701 /* The least object attributes (within an attributes subsection) known
1702 for any target. Some code assumes that the value 0 is not used and
1703 the field for that attribute can instead be used as a marker to
1704 indicate that attributes have been initialized. */
1705 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1707 /* The maximum number of known object attributes for any target. */
1708 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1710 /* The value of an object attribute. The type indicates whether the attribute
1711 holds and integer, a string, or both. It can also indicate that there can
1712 be no default (i.e. all values must be written to file, even zero), or
1713 that the value is in error and should not be written to file. */
1715 typedef struct obj_attribute
1717 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1718 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1719 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1720 #define ATTR_TYPE_FLAG_ERROR (1 << 3)
1722 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1723 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1724 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1725 #define ATTR_TYPE_HAS_ERROR(TYPE) ((TYPE) & ATTR_TYPE_FLAG_ERROR)
1732 typedef struct obj_attribute_list
1734 struct obj_attribute_list *next;
1737 } obj_attribute_list;
1739 /* Object attributes may either be defined by the processor ABI, index
1740 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1741 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1742 #define OBJ_ATTR_PROC 0
1743 #define OBJ_ATTR_GNU 1
1744 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1745 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1747 /* The following object attribute tags are taken as generic, for all
1748 targets and for "gnu" where there is no target standard. */
1755 Tag_compatibility = 32
1758 /* The following struct stores information about every SystemTap section
1759 found in the object file. */
1762 struct sdt_note *next;
1767 /* tdata information grabbed from an elf core file. */
1768 struct core_elf_obj_tdata
1777 /* Extra tdata information held for output ELF BFDs. */
1778 struct output_elf_obj_tdata
1780 struct elf_segment_map *seg_map;
1781 struct elf_strtab_hash *strtab_ptr;
1783 /* STT_SECTION symbols for each section */
1784 asymbol **section_syms;
1786 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1788 asection *eh_frame_hdr;
1790 /* NT_GNU_BUILD_ID note type info. */
1793 bfd_boolean (*after_write_object_contents) (bfd *);
1798 /* Records the result of `get_program_header_size'. */
1799 bfd_size_type program_header_size;
1801 /* Used when laying out sections. */
1802 file_ptr next_file_pos;
1804 int num_section_syms;
1805 unsigned int shstrtab_section, strtab_section;
1807 /* Segment flags for the PT_GNU_STACK segment. */
1808 unsigned int stack_flags;
1810 /* Used to determine if the e_flags field has been initialized */
1811 bfd_boolean flags_init;
1814 /* Indicate if the bfd contains SHF_GNU_MBIND sections or symbols that
1815 have the STT_GNU_IFUNC symbol type or STB_GNU_UNIQUE binding. Used
1816 to set the osabi field in the ELF header structure. */
1819 elf_gnu_osabi_mbind = 1 << 0,
1820 elf_gnu_osabi_ifunc = 1 << 1,
1821 elf_gnu_osabi_unique = 1 << 2,
1824 typedef struct elf_section_list
1826 Elf_Internal_Shdr hdr;
1828 struct elf_section_list * next;
1831 /* Some private data is stashed away for future use using the tdata pointer
1832 in the bfd structure. */
1834 struct elf_obj_tdata
1836 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1837 Elf_Internal_Shdr **elf_sect_ptr;
1838 Elf_Internal_Phdr *phdr;
1839 Elf_Internal_Shdr symtab_hdr;
1840 Elf_Internal_Shdr shstrtab_hdr;
1841 Elf_Internal_Shdr strtab_hdr;
1842 Elf_Internal_Shdr dynsymtab_hdr;
1843 Elf_Internal_Shdr dynstrtab_hdr;
1844 Elf_Internal_Shdr dynversym_hdr;
1845 Elf_Internal_Shdr dynverref_hdr;
1846 Elf_Internal_Shdr dynverdef_hdr;
1847 elf_section_list * symtab_shndx_list;
1848 bfd_vma gp; /* The gp value */
1849 unsigned int gp_size; /* The gp size */
1850 unsigned int num_elf_sections; /* elf_sect_ptr size */
1852 /* A mapping from external symbols to entries in the linker hash
1853 table, used when linking. This is indexed by the symbol index
1854 minus the sh_info field of the symbol table header. */
1855 struct elf_link_hash_entry **sym_hashes;
1857 /* Track usage and final offsets of GOT entries for local symbols.
1858 This array is indexed by symbol index. Elements are used
1859 identically to "got" in struct elf_link_hash_entry. */
1862 bfd_signed_vma *refcounts;
1864 struct got_entry **ents;
1867 /* The linker ELF emulation code needs to let the backend ELF linker
1868 know what filename should be used for a dynamic object if the
1869 dynamic object is found using a search. The emulation code then
1870 sometimes needs to know what name was actually used. Until the
1871 file has been added to the linker symbol table, this field holds
1872 the name the linker wants. After it has been added, it holds the
1873 name actually used, which will be the DT_SONAME entry if there is
1875 const char *dt_name;
1877 /* The linker emulation needs to know what audit libs
1878 are used by a dynamic object. */
1879 const char *dt_audit;
1881 /* Used by find_nearest_line entry point. */
1884 /* A place to stash dwarf1 info for this bfd. */
1885 struct dwarf1_debug *dwarf1_find_line_info;
1887 /* A place to stash dwarf2 info for this bfd. */
1888 void *dwarf2_find_line_info;
1890 /* Stash away info for yet another find line/function variant. */
1891 void *elf_find_function_cache;
1893 /* Number of symbol version definitions we are about to emit. */
1894 unsigned int cverdefs;
1896 /* Number of symbol version references we are about to emit. */
1897 unsigned int cverrefs;
1899 /* Symbol version definitions in external objects. */
1900 Elf_Internal_Verdef *verdef;
1902 /* Symbol version references to external objects. */
1903 Elf_Internal_Verneed *verref;
1905 /* A pointer to the .eh_frame section. */
1906 asection *eh_frame_section;
1908 /* Symbol buffer. */
1911 /* List of GNU properties. Will be updated by setup_gnu_properties
1912 after all input GNU properties are merged for output. */
1913 elf_property_list *properties;
1915 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1916 obj_attribute_list *other_obj_attributes[2];
1918 /* Linked-list containing information about every Systemtap section
1919 found in the object file. Each section corresponds to one entry
1921 struct sdt_note *sdt_note_head;
1923 Elf_Internal_Shdr **group_sect_ptr;
1926 /* Index into group_sect_ptr, updated by setup_group when finding a
1927 section's group. Used to optimize subsequent group searches. */
1928 unsigned int group_search_offset;
1930 unsigned int symtab_section, dynsymtab_section;
1931 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1933 /* An identifier used to distinguish different target
1934 specific extensions to this structure. */
1935 ENUM_BITFIELD (elf_target_id) object_id : 6;
1937 /* Whether a dyanmic object was specified normally on the linker
1938 command line, or was specified when --as-needed was in effect,
1939 or was found via a DT_NEEDED entry. */
1940 ENUM_BITFIELD (dynamic_lib_link_class) dyn_lib_class : 4;
1942 /* Whether the bfd uses OS specific bits that require ELFOSABI_GNU. */
1943 ENUM_BITFIELD (elf_gnu_osabi) has_gnu_osabi : 3;
1945 /* Whether if the bfd contains the GNU_PROPERTY_NO_COPY_ON_PROTECTED
1947 unsigned int has_no_copy_on_protected : 1;
1949 /* Irix 5 often screws up the symbol table, sorting local symbols
1950 after global symbols. This flag is set if the symbol table in
1951 this BFD appears to be screwed up. If it is, we ignore the
1952 sh_info field in the symbol table header, and always read all the
1954 unsigned int bad_symtab : 1;
1956 /* Information grabbed from an elf core file. */
1957 struct core_elf_obj_tdata *core;
1959 /* More information held for output ELF BFDs. */
1960 struct output_elf_obj_tdata *o;
1963 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1965 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1966 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1967 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1968 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1969 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1970 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1971 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1972 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1973 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1974 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1975 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1976 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
1977 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1978 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1979 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1980 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1981 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1982 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1983 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1984 #define elf_eh_frame_section(bfd) \
1985 (elf_tdata(bfd) -> eh_frame_section)
1986 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1987 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1988 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1989 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1990 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1991 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1992 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1993 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1994 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1995 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1996 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1997 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1998 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1999 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
2000 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
2001 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
2002 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
2003 #define elf_known_obj_attributes_proc(bfd) \
2004 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
2005 #define elf_other_obj_attributes_proc(bfd) \
2006 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
2007 #define elf_properties(bfd) (elf_tdata (bfd) -> properties)
2008 #define elf_has_no_copy_on_protected(bfd) \
2009 (elf_tdata(bfd) -> has_no_copy_on_protected)
2011 extern void _bfd_elf_swap_verdef_in
2012 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
2013 extern void _bfd_elf_swap_verdef_out
2014 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
2015 extern void _bfd_elf_swap_verdaux_in
2016 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
2017 extern void _bfd_elf_swap_verdaux_out
2018 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
2019 extern void _bfd_elf_swap_verneed_in
2020 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
2021 extern void _bfd_elf_swap_verneed_out
2022 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
2023 extern void _bfd_elf_swap_vernaux_in
2024 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
2025 extern void _bfd_elf_swap_vernaux_out
2026 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
2027 extern void _bfd_elf_swap_versym_in
2028 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
2029 extern void _bfd_elf_swap_versym_out
2030 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
2032 extern unsigned int _bfd_elf_section_from_bfd_section
2033 (bfd *, asection *);
2034 extern char *bfd_elf_string_from_elf_section
2035 (bfd *, unsigned, unsigned);
2036 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
2037 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
2038 Elf_External_Sym_Shndx *);
2039 extern const char *bfd_elf_sym_name
2040 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
2042 extern bfd_boolean _bfd_elf_copy_private_bfd_data
2044 extern bfd_boolean _bfd_elf_print_private_bfd_data
2046 const char * _bfd_elf_get_symbol_version_string
2047 (bfd *, asymbol *, bfd_boolean *);
2048 extern void bfd_elf_print_symbol
2049 (bfd *, void *, asymbol *, bfd_print_symbol_type);
2051 extern unsigned int _bfd_elf_eh_frame_address_size
2052 (bfd *, const asection *);
2053 extern bfd_byte _bfd_elf_encode_eh_address
2054 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
2055 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
2056 extern bfd_boolean _bfd_elf_can_make_relative
2057 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
2059 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
2060 (const struct bfd_link_info *, const asection *,
2061 const Elf_Internal_Rela *);
2062 extern bfd_vma _bfd_elf_rela_local_sym
2063 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
2064 extern bfd_vma _bfd_elf_rel_local_sym
2065 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
2066 extern bfd_vma _bfd_elf_section_offset
2067 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2069 extern unsigned long bfd_elf_hash
2071 extern unsigned long bfd_elf_gnu_hash
2074 extern bfd_reloc_status_type bfd_elf_generic_reloc
2075 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
2076 extern bfd_boolean bfd_elf_allocate_object
2077 (bfd *, size_t, enum elf_target_id);
2078 extern bfd_boolean bfd_elf_make_object
2080 extern bfd_boolean bfd_elf_mkcorefile
2082 extern bfd_boolean _bfd_elf_make_section_from_shdr
2083 (bfd *, Elf_Internal_Shdr *, const char *, int);
2084 extern bfd_boolean _bfd_elf_make_section_from_phdr
2085 (bfd *, Elf_Internal_Phdr *, int, const char *);
2086 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
2087 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
2088 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
2090 extern void _bfd_elf_link_hash_table_free
2092 extern void _bfd_elf_link_hash_copy_indirect
2093 (struct bfd_link_info *, struct elf_link_hash_entry *,
2094 struct elf_link_hash_entry *);
2095 extern void _bfd_elf_link_hash_hide_symbol
2096 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
2097 extern void _bfd_elf_link_hide_symbol
2098 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
2099 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
2100 (struct bfd_link_info *, struct elf_link_hash_entry *);
2101 extern bfd_boolean _bfd_elf_link_hash_table_init
2102 (struct elf_link_hash_table *, bfd *,
2103 struct bfd_hash_entry *(*)
2104 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
2105 unsigned int, enum elf_target_id);
2106 extern bfd_boolean _bfd_elf_slurp_version_tables
2107 (bfd *, bfd_boolean);
2108 extern bfd_boolean _bfd_elf_merge_sections
2109 (bfd *, struct bfd_link_info *);
2110 extern bfd_boolean _bfd_elf_match_sections_by_type
2111 (bfd *, const asection *, bfd *, const asection *);
2112 extern bfd_boolean bfd_elf_is_group_section
2113 (bfd *, const struct bfd_section *);
2114 extern bfd_boolean _bfd_elf_section_already_linked
2115 (bfd *, asection *, struct bfd_link_info *);
2116 extern void bfd_elf_set_group_contents
2117 (bfd *, asection *, void *);
2118 extern unsigned int _bfd_elf_filter_global_symbols
2119 (bfd *, struct bfd_link_info *, asymbol **, long);
2120 extern asection *_bfd_elf_check_kept_section
2121 (asection *, struct bfd_link_info *);
2122 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
2123 extern void _bfd_elf_copy_link_hash_symbol_type
2124 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
2125 extern bfd_boolean _bfd_elf_size_group_sections
2126 (struct bfd_link_info *);
2127 extern bfd_boolean _bfd_elf_fixup_group_sections
2128 (bfd *, asection *);
2129 extern bfd_boolean _bfd_elf_copy_private_header_data
2131 extern bfd_boolean _bfd_elf_copy_private_symbol_data
2132 (bfd *, asymbol *, bfd *, asymbol *);
2133 #define _bfd_generic_init_private_section_data \
2134 _bfd_elf_init_private_section_data
2135 extern bfd_boolean _bfd_elf_init_private_section_data
2136 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
2137 extern bfd_boolean _bfd_elf_copy_private_section_data
2138 (bfd *, asection *, bfd *, asection *);
2139 extern bfd_boolean _bfd_elf_write_object_contents
2141 extern bfd_boolean _bfd_elf_write_corefile_contents
2143 extern bfd_boolean _bfd_elf_set_section_contents
2144 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
2145 extern long _bfd_elf_get_symtab_upper_bound
2147 extern long _bfd_elf_canonicalize_symtab
2148 (bfd *, asymbol **);
2149 extern long _bfd_elf_get_dynamic_symtab_upper_bound
2151 extern long _bfd_elf_canonicalize_dynamic_symtab
2152 (bfd *, asymbol **);
2153 extern long _bfd_elf_get_synthetic_symtab
2154 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
2155 extern long _bfd_elf_get_reloc_upper_bound
2157 extern long _bfd_elf_canonicalize_reloc
2158 (bfd *, sec_ptr, arelent **, asymbol **);
2159 extern asection * _bfd_elf_get_dynamic_reloc_section
2160 (bfd *, asection *, bfd_boolean);
2161 extern asection * _bfd_elf_make_dynamic_reloc_section
2162 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
2163 extern long _bfd_elf_get_dynamic_reloc_upper_bound
2165 extern long _bfd_elf_canonicalize_dynamic_reloc
2166 (bfd *, arelent **, asymbol **);
2167 extern asymbol *_bfd_elf_make_empty_symbol
2169 extern void _bfd_elf_get_symbol_info
2170 (bfd *, asymbol *, symbol_info *);
2171 extern bfd_boolean _bfd_elf_is_local_label_name
2172 (bfd *, const char *);
2173 extern alent *_bfd_elf_get_lineno
2175 extern bfd_boolean _bfd_elf_set_arch_mach
2176 (bfd *, enum bfd_architecture, unsigned long);
2177 extern bfd_boolean _bfd_elf_find_nearest_line
2178 (bfd *, asymbol **, asection *, bfd_vma,
2179 const char **, const char **, unsigned int *, unsigned int *);
2180 extern bfd_boolean _bfd_elf_find_line
2181 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
2182 extern bfd_boolean _bfd_elf_find_inliner_info
2183 (bfd *, const char **, const char **, unsigned int *);
2184 extern asymbol *_bfd_elf_find_function
2185 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
2186 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
2187 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
2188 extern int _bfd_elf_sizeof_headers
2189 (bfd *, struct bfd_link_info *);
2190 extern bfd_boolean _bfd_elf_new_section_hook
2191 (bfd *, asection *);
2192 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
2193 (const char *, const struct bfd_elf_special_section *, unsigned int);
2194 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
2195 (bfd *, asection *);
2197 extern bfd_boolean _bfd_elf_link_hide_sym_by_version
2198 (struct bfd_link_info *, struct elf_link_hash_entry *);
2200 /* If the target doesn't have reloc handling written yet: */
2201 extern bfd_boolean _bfd_elf_no_info_to_howto
2202 (bfd *, arelent *, Elf_Internal_Rela *);
2204 extern bfd_boolean bfd_section_from_shdr
2205 (bfd *, unsigned int shindex);
2206 extern bfd_boolean bfd_section_from_phdr
2207 (bfd *, Elf_Internal_Phdr *, int);
2209 extern int _bfd_elf_symbol_from_bfd_symbol
2210 (bfd *, asymbol **);
2212 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
2213 (struct sym_cache *, bfd *, unsigned long);
2214 extern asection *bfd_section_from_elf_index
2215 (bfd *, unsigned int);
2217 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2219 extern void _bfd_elf_strtab_free
2220 (struct elf_strtab_hash *);
2221 extern size_t _bfd_elf_strtab_add
2222 (struct elf_strtab_hash *, const char *, bfd_boolean);
2223 extern void _bfd_elf_strtab_addref
2224 (struct elf_strtab_hash *, size_t);
2225 extern void _bfd_elf_strtab_delref
2226 (struct elf_strtab_hash *, size_t);
2227 extern unsigned int _bfd_elf_strtab_refcount
2228 (struct elf_strtab_hash *, size_t);
2229 extern void _bfd_elf_strtab_clear_all_refs
2230 (struct elf_strtab_hash *);
2231 extern void *_bfd_elf_strtab_save
2232 (struct elf_strtab_hash *);
2233 extern void _bfd_elf_strtab_restore
2234 (struct elf_strtab_hash *, void *);
2235 extern bfd_size_type _bfd_elf_strtab_size
2236 (struct elf_strtab_hash *);
2237 extern bfd_size_type _bfd_elf_strtab_offset
2238 (struct elf_strtab_hash *, size_t);
2239 extern bfd_boolean _bfd_elf_strtab_emit
2240 (bfd *, struct elf_strtab_hash *);
2241 extern void _bfd_elf_strtab_finalize
2242 (struct elf_strtab_hash *);
2244 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2245 (bfd *, struct bfd_link_info *);
2246 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2247 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2248 extern void _bfd_elf_parse_eh_frame
2249 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2250 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2251 (struct bfd_link_info *info);
2253 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2254 (bfd *, struct bfd_link_info *, asection *,
2255 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2256 extern bfd_boolean _bfd_elf_adjust_eh_frame_global_symbol
2257 (struct elf_link_hash_entry *, void *);
2258 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2259 (bfd *, struct bfd_link_info *);
2260 extern bfd_vma _bfd_elf_eh_frame_section_offset
2261 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2262 extern bfd_boolean _bfd_elf_write_section_eh_frame
2263 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2264 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2265 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2266 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2267 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2268 (bfd *, struct bfd_link_info *);
2269 extern bfd_boolean _bfd_elf_eh_frame_present
2270 (struct bfd_link_info *);
2271 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2272 (struct bfd_link_info *);
2273 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2274 (struct bfd_link_info *);
2276 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2278 extern long _bfd_elf_link_lookup_local_dynindx
2279 (struct bfd_link_info *, bfd *, long);
2280 extern bfd_boolean _bfd_elf_compute_section_file_positions
2281 (bfd *, struct bfd_link_info *);
2282 extern file_ptr _bfd_elf_assign_file_position_for_section
2283 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2285 extern bfd_boolean _bfd_elf_validate_reloc
2288 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2289 (bfd *, struct bfd_link_info *);
2290 extern bfd_boolean _bfd_elf_omit_section_dynsym_default
2291 (bfd *, struct bfd_link_info *, asection *);
2292 extern bfd_boolean _bfd_elf_omit_section_dynsym_all
2293 (bfd *, struct bfd_link_info *, asection *);
2294 extern bfd_boolean _bfd_elf_create_dynamic_sections
2295 (bfd *, struct bfd_link_info *);
2296 extern bfd_boolean _bfd_elf_create_got_section
2297 (bfd *, struct bfd_link_info *);
2298 extern asection *_bfd_elf_section_for_symbol
2299 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2300 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2301 (bfd *, struct bfd_link_info *, asection *, const char *);
2302 extern void _bfd_elf_init_1_index_section
2303 (bfd *, struct bfd_link_info *);
2304 extern void _bfd_elf_init_2_index_sections
2305 (bfd *, struct bfd_link_info *);
2307 extern bfd_boolean _bfd_elfcore_make_pseudosection
2308 (bfd *, char *, size_t, ufile_ptr);
2309 extern char *_bfd_elfcore_strndup
2310 (bfd *, char *, size_t);
2312 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2313 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2315 extern bfd_boolean _bfd_elf_link_output_relocs
2316 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2317 struct elf_link_hash_entry **);
2319 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2320 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2322 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2323 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2325 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2326 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2328 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2329 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2331 extern bfd_boolean _bfd_elf_setup_sections
2334 extern struct bfd_link_hash_entry *bfd_elf_define_start_stop
2335 (struct bfd_link_info *, const char *, asection *);
2337 extern void _bfd_elf_post_process_headers (bfd *, struct bfd_link_info *);
2339 extern bfd_boolean _bfd_elf_final_write_processing (bfd *);
2341 extern const bfd_target *bfd_elf32_object_p
2343 extern const bfd_target *bfd_elf32_core_file_p
2345 extern char *bfd_elf32_core_file_failing_command
2347 extern int bfd_elf32_core_file_failing_signal
2349 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2351 extern int bfd_elf32_core_file_pid
2354 extern bfd_boolean bfd_elf32_swap_symbol_in
2355 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2356 extern void bfd_elf32_swap_symbol_out
2357 (bfd *, const Elf_Internal_Sym *, void *, void *);
2358 extern void bfd_elf32_swap_reloc_in
2359 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2360 extern void bfd_elf32_swap_reloc_out
2361 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2362 extern void bfd_elf32_swap_reloca_in
2363 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2364 extern void bfd_elf32_swap_reloca_out
2365 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2366 extern void bfd_elf32_swap_phdr_in
2367 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2368 extern void bfd_elf32_swap_phdr_out
2369 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2370 extern void bfd_elf32_swap_dyn_in
2371 (bfd *, const void *, Elf_Internal_Dyn *);
2372 extern void bfd_elf32_swap_dyn_out
2373 (bfd *, const Elf_Internal_Dyn *, void *);
2374 extern long bfd_elf32_slurp_symbol_table
2375 (bfd *, asymbol **, bfd_boolean);
2376 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2378 extern int bfd_elf32_write_out_phdrs
2379 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2380 extern bfd_boolean bfd_elf32_checksum_contents
2381 (bfd * , void (*) (const void *, size_t, void *), void *);
2382 extern void bfd_elf32_write_relocs
2383 (bfd *, asection *, void *);
2384 extern bfd_boolean bfd_elf32_slurp_reloc_table
2385 (bfd *, asection *, asymbol **, bfd_boolean);
2387 extern const bfd_target *bfd_elf64_object_p
2389 extern const bfd_target *bfd_elf64_core_file_p
2391 extern char *bfd_elf64_core_file_failing_command
2393 extern int bfd_elf64_core_file_failing_signal
2395 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2397 extern int bfd_elf64_core_file_pid
2400 extern bfd_boolean bfd_elf64_swap_symbol_in
2401 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2402 extern void bfd_elf64_swap_symbol_out
2403 (bfd *, const Elf_Internal_Sym *, void *, void *);
2404 extern void bfd_elf64_swap_reloc_in
2405 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2406 extern void bfd_elf64_swap_reloc_out
2407 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2408 extern void bfd_elf64_swap_reloca_in
2409 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2410 extern void bfd_elf64_swap_reloca_out
2411 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2412 extern void bfd_elf64_swap_phdr_in
2413 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2414 extern void bfd_elf64_swap_phdr_out
2415 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2416 extern void bfd_elf64_swap_dyn_in
2417 (bfd *, const void *, Elf_Internal_Dyn *);
2418 extern void bfd_elf64_swap_dyn_out
2419 (bfd *, const Elf_Internal_Dyn *, void *);
2420 extern long bfd_elf64_slurp_symbol_table
2421 (bfd *, asymbol **, bfd_boolean);
2422 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2424 extern int bfd_elf64_write_out_phdrs
2425 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2426 extern bfd_boolean bfd_elf64_checksum_contents
2427 (bfd * , void (*) (const void *, size_t, void *), void *);
2428 extern void bfd_elf64_write_relocs
2429 (bfd *, asection *, void *);
2430 extern bfd_boolean bfd_elf64_slurp_reloc_table
2431 (bfd *, asection *, asymbol **, bfd_boolean);
2433 extern bfd_boolean _bfd_elf_default_relocs_compatible
2434 (const bfd_target *, const bfd_target *);
2436 extern bfd_boolean _bfd_elf_relocs_compatible
2437 (const bfd_target *, const bfd_target *);
2438 extern bfd_boolean _bfd_elf_notice_as_needed
2439 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2441 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2442 (bfd *, struct bfd_link_info *, const char *);
2443 extern bfd_boolean bfd_elf_link_add_symbols
2444 (bfd *, struct bfd_link_info *);
2445 extern bfd_boolean _bfd_elf_add_dynamic_entry
2446 (struct bfd_link_info *, bfd_vma, bfd_vma);
2447 extern bfd_boolean _bfd_elf_link_check_relocs
2448 (bfd *, struct bfd_link_info *);
2450 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2451 (struct bfd_link_info *, struct elf_link_hash_entry *);
2453 extern int bfd_elf_link_record_local_dynamic_symbol
2454 (struct bfd_link_info *, bfd *, long);
2456 extern bfd_boolean _bfd_elf_close_and_cleanup
2459 extern bfd_boolean _bfd_elf_common_definition
2460 (Elf_Internal_Sym *);
2462 extern unsigned int _bfd_elf_common_section_index
2465 extern asection *_bfd_elf_common_section
2468 extern bfd_vma _bfd_elf_default_got_elt_size
2469 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2472 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2473 (bfd *, arelent *, struct bfd_symbol *, void *,
2474 asection *, bfd *, char **);
2476 extern bfd_boolean bfd_elf_final_link
2477 (bfd *, struct bfd_link_info *);
2479 extern void _bfd_elf_gc_keep
2480 (struct bfd_link_info *info);
2482 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2483 (struct elf_link_hash_entry *h, void *inf);
2485 extern bfd_boolean bfd_elf_gc_sections
2486 (bfd *, struct bfd_link_info *);
2488 extern bfd_boolean bfd_elf_gc_record_vtinherit
2489 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2491 extern bfd_boolean bfd_elf_gc_record_vtentry
2492 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2494 extern asection *_bfd_elf_gc_mark_hook
2495 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2496 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2498 extern asection *_bfd_elf_gc_mark_rsec
2499 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2500 struct elf_reloc_cookie *, bfd_boolean *);
2502 extern bfd_boolean _bfd_elf_gc_mark_reloc
2503 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2504 struct elf_reloc_cookie *);
2506 extern bfd_boolean _bfd_elf_gc_mark_fdes
2507 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2508 struct elf_reloc_cookie *);
2510 extern bfd_boolean _bfd_elf_gc_mark
2511 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2513 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2514 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2516 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2517 (bfd *, struct bfd_link_info *);
2519 extern bfd_boolean bfd_elf_gc_common_final_link
2520 (bfd *, struct bfd_link_info *);
2522 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2525 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2526 (bfd *, asection *);
2528 extern bfd_boolean _bfd_elf_map_sections_to_segments
2529 (bfd *, struct bfd_link_info *);
2531 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2533 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2536 extern asection *_bfd_elf_plt_get_reloc_section (bfd *, const char *);
2538 extern int bfd_elf_get_default_section_type (flagword);
2540 extern bfd_boolean bfd_elf_lookup_section_flags
2541 (struct bfd_link_info *, struct flag_info *, asection *);
2543 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2544 (bfd * abfd, asection * section);
2546 /* PowerPC @tls opcode transform/validate. */
2547 extern unsigned int _bfd_elf_ppc_at_tls_transform
2548 (unsigned int, unsigned int);
2549 /* PowerPC @tprel opcode transform/validate. */
2550 extern unsigned int _bfd_elf_ppc_at_tprel_transform
2551 (unsigned int, unsigned int);
2552 /* PowerPC elf_object_p tweak. */
2553 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *);
2554 /* PowerPC .gnu.attributes handling common to both 32-bit and 64-bit. */
2555 extern bfd_boolean _bfd_elf_ppc_merge_fp_attributes
2556 (bfd *, struct bfd_link_info *);
2558 /* Exported interface for writing elf corefile notes. */
2559 extern char *elfcore_write_note
2560 (bfd *, char *, int *, const char *, int, const void *, int);
2561 extern char *elfcore_write_prpsinfo
2562 (bfd *, char *, int *, const char *, const char *);
2563 extern char *elfcore_write_prstatus
2564 (bfd *, char *, int *, long, int, const void *);
2565 extern char * elfcore_write_pstatus
2566 (bfd *, char *, int *, long, int, const void *);
2567 extern char *elfcore_write_prfpreg
2568 (bfd *, char *, int *, const void *, int);
2569 extern char *elfcore_write_prxfpreg
2570 (bfd *, char *, int *, const void *, int);
2571 extern char *elfcore_write_xstatereg
2572 (bfd *, char *, int *, const void *, int);
2573 extern char *elfcore_write_ppc_vmx
2574 (bfd *, char *, int *, const void *, int);
2575 extern char *elfcore_write_ppc_vsx
2576 (bfd *, char *, int *, const void *, int);
2577 extern char *elfcore_write_ppc_tar
2578 (bfd *, char *, int *, const void *, int);
2579 extern char *elfcore_write_ppc_ppr
2580 (bfd *, char *, int *, const void *, int);
2581 extern char *elfcore_write_ppc_dscr
2582 (bfd *, char *, int *, const void *, int);
2583 extern char *elfcore_write_ppc_ebb
2584 (bfd *, char *, int *, const void *, int);
2585 extern char *elfcore_write_ppc_pmu
2586 (bfd *, char *, int *, const void *, int);
2587 extern char *elfcore_write_ppc_tm_cgpr
2588 (bfd *, char *, int *, const void *, int);
2589 extern char *elfcore_write_ppc_tm_cfpr
2590 (bfd *, char *, int *, const void *, int);
2591 extern char *elfcore_write_ppc_tm_cvmx
2592 (bfd *, char *, int *, const void *, int);
2593 extern char *elfcore_write_ppc_tm_cvsx
2594 (bfd *, char *, int *, const void *, int);
2595 extern char *elfcore_write_ppc_tm_spr
2596 (bfd *, char *, int *, const void *, int);
2597 extern char *elfcore_write_ppc_tm_ctar
2598 (bfd *, char *, int *, const void *, int);
2599 extern char *elfcore_write_ppc_tm_cppr
2600 (bfd *, char *, int *, const void *, int);
2601 extern char *elfcore_write_ppc_tm_cdscr
2602 (bfd *, char *, int *, const void *, int);
2603 extern char *elfcore_write_s390_timer
2604 (bfd *, char *, int *, const void *, int);
2605 extern char *elfcore_write_s390_todcmp
2606 (bfd *, char *, int *, const void *, int);
2607 extern char *elfcore_write_s390_todpreg
2608 (bfd *, char *, int *, const void *, int);
2609 extern char *elfcore_write_s390_ctrs
2610 (bfd *, char *, int *, const void *, int);
2611 extern char *elfcore_write_s390_prefix
2612 (bfd *, char *, int *, const void *, int);
2613 extern char *elfcore_write_s390_last_break
2614 (bfd *, char *, int *, const void *, int);
2615 extern char *elfcore_write_s390_system_call
2616 (bfd *, char *, int *, const void *, int);
2617 extern char *elfcore_write_s390_tdb
2618 (bfd *, char *, int *, const void *, int);
2619 extern char *elfcore_write_s390_vxrs_low
2620 (bfd *, char *, int *, const void *, int);
2621 extern char *elfcore_write_s390_vxrs_high
2622 (bfd *, char *, int *, const void *, int);
2623 extern char *elfcore_write_s390_gs_cb
2624 (bfd *, char *, int *, const void *, int);
2625 extern char *elfcore_write_s390_gs_bc
2626 (bfd *, char *, int *, const void *, int);
2627 extern char *elfcore_write_arm_vfp
2628 (bfd *, char *, int *, const void *, int);
2629 extern char *elfcore_write_aarch_tls
2630 (bfd *, char *, int *, const void *, int);
2631 extern char *elfcore_write_aarch_hw_break
2632 (bfd *, char *, int *, const void *, int);
2633 extern char *elfcore_write_aarch_hw_watch
2634 (bfd *, char *, int *, const void *, int);
2635 extern char *elfcore_write_aarch_sve
2636 (bfd *, char *, int *, const void *, int);
2637 extern char *elfcore_write_aarch_pauth
2638 (bfd *, char *, int *, const void *, int);
2639 extern char *elfcore_write_lwpstatus
2640 (bfd *, char *, int *, long, int, const void *);
2641 extern char *elfcore_write_register_note
2642 (bfd *, char *, int *, const char *, const void *, int);
2644 /* Internal structure which holds information to be included in the
2645 PRPSINFO section of Linux core files.
2647 This is an "internal" structure in the sense that it should be used
2648 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2649 function), so things like endianess shouldn't be an issue. This
2650 structure will eventually be converted in one of the
2651 `elf_external_linux_*' structures and written out to an output bfd
2652 by one of the functions declared below. */
2654 struct elf_internal_linux_prpsinfo
2656 char pr_state; /* Numeric process state. */
2657 char pr_sname; /* Char for pr_state. */
2658 char pr_zomb; /* Zombie. */
2659 char pr_nice; /* Nice val. */
2660 unsigned long pr_flag; /* Flags. */
2661 unsigned int pr_uid;
2662 unsigned int pr_gid;
2663 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2664 char pr_fname[16 + 1]; /* Filename of executable. */
2665 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2668 /* Linux/most 32-bit archs. */
2669 extern char *elfcore_write_linux_prpsinfo32
2670 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2672 /* Linux/most 64-bit archs. */
2673 extern char *elfcore_write_linux_prpsinfo64
2674 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2676 extern bfd *_bfd_elf32_bfd_from_remote_memory
2677 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2678 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2679 extern bfd *_bfd_elf64_bfd_from_remote_memory
2680 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2681 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2683 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2684 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2685 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2686 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2687 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2688 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2689 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2690 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2691 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2692 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2693 unsigned int, const char *);
2694 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2695 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2698 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2699 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2700 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2701 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2702 extern bfd_boolean _bfd_elf_merge_object_attributes
2703 (bfd *, struct bfd_link_info *);
2704 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2705 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2706 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2708 extern bfd_boolean _bfd_elf_parse_gnu_properties
2709 (bfd *, Elf_Internal_Note *);
2710 extern elf_property * _bfd_elf_get_property
2711 (bfd *, unsigned int, unsigned int);
2712 extern bfd *_bfd_elf_link_setup_gnu_properties
2713 (struct bfd_link_info *);
2714 extern bfd_size_type _bfd_elf_convert_gnu_property_size
2716 extern bfd_boolean _bfd_elf_convert_gnu_properties
2717 (bfd *, asection *, bfd *, bfd_byte **, bfd_size_type *);
2719 /* The linker may need to keep track of the number of relocs that it
2720 decides to copy as dynamic relocs in check_relocs for each symbol.
2721 This is so that it can later discard them if they are found to be
2722 unnecessary. We can store the information in a field extending the
2723 regular ELF linker hash table. */
2725 struct elf_dyn_relocs
2727 struct elf_dyn_relocs *next;
2729 /* The input section of the reloc. */
2732 /* Total number of relocs copied for the input section. */
2733 bfd_size_type count;
2735 /* Number of pc-relative relocs copied for the input section. */
2736 bfd_size_type pc_count;
2739 extern bfd_boolean _bfd_elf_create_ifunc_sections
2740 (bfd *, struct bfd_link_info *);
2741 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2742 (struct bfd_link_info *, struct elf_link_hash_entry *,
2743 struct elf_dyn_relocs **, bfd_boolean *, unsigned int,
2744 unsigned int, unsigned int, bfd_boolean);
2746 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2747 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2749 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2750 extern bfd_vma elf64_r_sym (bfd_vma);
2751 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2752 extern bfd_vma elf32_r_sym (bfd_vma);
2754 extern bfd_boolean is_debuginfo_file (bfd *);
2756 /* Large common section. */
2757 extern asection _bfd_elf_large_com_section;
2759 /* Hash for local symbol with the first section id, ID, in the input
2760 file and the local symbol index, SYM. */
2761 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2762 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2763 ^ (SYM) ^ ((ID) >> 16))
2765 /* This is the condition under which finish_dynamic_symbol will be called.
2766 If our finish_dynamic_symbol isn't called, we'll need to do something
2767 about initializing any .plt and .got entries in relocate_section. */
2768 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2770 && ((SHARED) || !(H)->forced_local) \
2771 && ((H)->dynindx != -1 || (H)->forced_local))
2773 /* This macro is to avoid lots of duplicated code in the body
2774 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2775 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2776 r_symndx, symtab_hdr, sym_hashes, \
2777 h, sec, relocation, \
2778 unresolved_reloc, warned, ignored) \
2781 /* It seems this can happen with erroneous or unsupported \
2782 input (mixing a.out and elf in an archive, for example.) */ \
2783 if (sym_hashes == NULL) \
2786 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2788 if (info->wrap_hash != NULL \
2789 && (input_section->flags & SEC_DEBUGGING) != 0) \
2790 h = ((struct elf_link_hash_entry *) \
2791 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2793 while (h->root.type == bfd_link_hash_indirect \
2794 || h->root.type == bfd_link_hash_warning) \
2795 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2799 unresolved_reloc = FALSE; \
2801 if (h->root.type == bfd_link_hash_defined \
2802 || h->root.type == bfd_link_hash_defweak) \
2804 sec = h->root.u.def.section; \
2806 || sec->output_section == NULL) \
2807 /* Set a flag that will be cleared later if we find a \
2808 relocation value for this symbol. output_section \
2809 is typically NULL for symbols satisfied by a shared \
2811 unresolved_reloc = TRUE; \
2813 relocation = (h->root.u.def.value \
2814 + sec->output_section->vma \
2815 + sec->output_offset); \
2817 else if (h->root.type == bfd_link_hash_undefweak) \
2819 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2820 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2822 else if (!bfd_link_relocatable (info)) \
2825 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2826 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2827 (*info->callbacks->undefined_symbol) (info, \
2828 h->root.root.string, \
2831 rel->r_offset, err); \
2834 (void) unresolved_reloc; \
2840 /* This macro is to avoid lots of duplicated code in the body of the
2841 loop over relocations in xxx_relocate_section() in the various
2844 Handle relocations against symbols from removed linkonce sections,
2845 or sections discarded by a linker script. When doing a relocatable
2846 link, we remove such relocations. Otherwise, we just want the
2847 section contents zeroed and avoid any special processing. */
2848 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2849 rel, count, relend, \
2850 howto, index, contents) \
2853 _bfd_clear_contents (howto, input_bfd, input_section, \
2854 contents, rel[index].r_offset); \
2856 if (bfd_link_relocatable (info) \
2857 && (input_section->flags & SEC_DEBUGGING)) \
2859 /* Only remove relocations in debug sections since other \
2860 sections may require relocations. */ \
2861 Elf_Internal_Shdr *rel_hdr; \
2863 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2865 /* Avoid empty output section. */ \
2866 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2868 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2869 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2870 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2872 memmove (rel, rel + count, \
2873 (relend - rel - count) * sizeof (*rel)); \
2875 input_section->reloc_count -= count; \
2882 for (i_ = 0; i_ < count; i_++) \
2884 rel[i_].r_info = 0; \
2885 rel[i_].r_addend = 0; \
2891 /* Will a symbol be bound to the definition within the shared
2892 library, if any. A unique symbol can never be bound locally. */
2893 #define SYMBOLIC_BIND(INFO, H) \
2894 (!(H)->unique_global \
2895 && ((INFO)->symbolic \
2896 || (H)->start_stop \
2897 || ((INFO)->dynamic && !(H)->dynamic)))
2902 #endif /* _LIBELF_H_ */