1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2015 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 linker hash table entries. */
113 struct elf_link_hash_entry
115 struct bfd_link_hash_entry root;
117 /* Symbol index in output file. This is initialized to -1. It is
118 set to -2 if the symbol is used by a reloc. */
121 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
122 -1 if this is not a dynamic symbol. */
123 /* ??? Note that this is consistently used as a synonym for tests
124 against whether we can perform various simplifying transformations
125 to the code. (E.g. changing a pc-relative jump to a PLT entry
126 into a pc-relative jump to the target function.) That test, which
127 is often relatively complex, and someplaces wrong or incomplete,
128 should really be replaced by a predicate in elflink.c.
130 End result: this field -1 does not indicate that the symbol is
131 not in the dynamic symbol table, but rather that the symbol is
132 not visible outside this DSO. */
135 /* If this symbol requires an entry in the global offset table, the
136 processor specific backend uses this field to track usage and
137 final offset. Two schemes are supported: The first assumes that
138 a symbol may only have one GOT entry, and uses REFCOUNT until
139 size_dynamic_sections, at which point the contents of the .got is
140 fixed. Afterward, if OFFSET is -1, then the symbol does not
141 require a global offset table entry. The second scheme allows
142 multiple GOT entries per symbol, managed via a linked list
143 pointed to by GLIST. */
144 union gotplt_union got;
146 /* Same, but tracks a procedure linkage table entry. */
147 union gotplt_union plt;
152 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
153 unsigned int type : 8;
155 /* Symbol st_other value, symbol visibility. */
156 unsigned int other : 8;
158 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
159 unsigned int target_internal : 8;
161 /* Symbol is referenced by a non-shared object (other than the object
162 in which it is defined). */
163 unsigned int ref_regular : 1;
164 /* Symbol is defined by a non-shared object. */
165 unsigned int def_regular : 1;
166 /* Symbol is referenced by a shared object. */
167 unsigned int ref_dynamic : 1;
168 /* Symbol is defined by a shared object. */
169 unsigned int def_dynamic : 1;
170 /* Symbol has a non-weak reference from a non-shared object (other than
171 the object in which it is defined). */
172 unsigned int ref_regular_nonweak : 1;
173 /* Dynamic symbol has been adjustd. */
174 unsigned int dynamic_adjusted : 1;
175 /* Symbol needs a copy reloc. */
176 unsigned int needs_copy : 1;
177 /* Symbol needs a procedure linkage table entry. */
178 unsigned int needs_plt : 1;
179 /* Symbol appears in a non-ELF input file. */
180 unsigned int non_elf : 1;
181 /* Symbol should be marked as hidden in the version information. */
182 unsigned int hidden : 1;
183 /* Symbol was forced to local scope due to a version script file. */
184 unsigned int forced_local : 1;
185 /* Symbol was forced to be dynamic due to a version script file. */
186 unsigned int dynamic : 1;
187 /* Symbol was marked during garbage collection. */
188 unsigned int mark : 1;
189 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
190 not currently set by all the backends. */
191 unsigned int non_got_ref : 1;
192 /* Symbol has a definition in a shared object.
193 FIXME: There is no real need for this field if def_dynamic is never
194 cleared and all places that test def_dynamic also test def_regular. */
195 unsigned int dynamic_def : 1;
196 /* Symbol has a non-weak reference from a shared object. */
197 unsigned int ref_dynamic_nonweak : 1;
198 /* Symbol is referenced with a relocation where C/C++ pointer equality
200 unsigned int pointer_equality_needed : 1;
201 /* Symbol is a unique global symbol. */
202 unsigned int unique_global : 1;
203 /* Symbol is defined by a shared library with non-default visibility
204 in a read/write section. */
205 unsigned int protected_def : 1;
207 /* String table index in .dynstr if this is a dynamic symbol. */
208 unsigned long dynstr_index;
212 /* If this is a weak defined symbol from a dynamic object, this
213 field points to a defined symbol with the same value, if there is
214 one. Otherwise it is NULL. */
215 struct elf_link_hash_entry *weakdef;
217 /* Hash value of the name computed using the ELF hash function.
218 Used part way through size_dynamic_sections, after we've finished
220 unsigned long elf_hash_value;
223 /* Version information. */
226 /* This field is used for a symbol which is not defined in a
227 regular object. It points to the version information read in
228 from the dynamic object. */
229 Elf_Internal_Verdef *verdef;
230 /* This field is used for a symbol which is defined in a regular
231 object. It is set up in size_dynamic_sections. It points to
232 the version information we should write out for this symbol. */
233 struct bfd_elf_version_tree *vertree;
236 struct elf_link_virtual_table_entry *vtable;
239 /* Will references to this symbol always reference the symbol
241 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
242 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
244 /* Will _calls_ to this symbol always call the version in this object? */
245 #define SYMBOL_CALLS_LOCAL(INFO, H) \
246 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
248 /* Common symbols that are turned into definitions don't have the
249 DEF_REGULAR flag set, so they might appear to be undefined.
250 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
251 #define ELF_COMMON_DEF_P(H) \
253 && !(H)->def_dynamic \
254 && (H)->root.type == bfd_link_hash_defined)
256 /* Records local symbols to be emitted in the dynamic symbol table. */
258 struct elf_link_local_dynamic_entry
260 struct elf_link_local_dynamic_entry *next;
262 /* The input bfd this symbol came from. */
265 /* The index of the local symbol being copied. */
268 /* The index in the outgoing dynamic symbol table. */
271 /* A copy of the input symbol. */
272 Elf_Internal_Sym isym;
275 struct elf_link_loaded_list
277 struct elf_link_loaded_list *next;
281 /* Structures used by the eh_frame optimization code. */
286 /* If REMOVED == 1, this is the CIE that the FDE originally used.
287 The CIE belongs to the same .eh_frame input section as the FDE.
289 If REMOVED == 0, this is the CIE that we have chosen to use for
290 the output FDE. The CIE's REMOVED field is also 0, but the CIE
291 might belong to a different .eh_frame input section from the FDE.
293 May be NULL to signify that the FDE should be discarded. */
294 struct eh_cie_fde *cie_inf;
295 struct eh_cie_fde *next_for_section;
298 /* CIEs have three states:
300 - REMOVED && !MERGED: Slated for removal because we haven't yet
301 proven that an FDE needs it. FULL_CIE, if nonnull, points to
302 more detailed information about the CIE.
304 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
305 which may not belong to the same input section.
307 - !REMOVED: We have decided to keep this CIE. SEC is the
308 .eh_frame input section that contains the CIE. */
310 struct cie *full_cie;
311 struct eh_cie_fde *merged_with;
315 /* The offset of the personality data from the start of the CIE,
316 or 0 if the CIE doesn't have any. */
317 unsigned int personality_offset : 8;
319 /* True if we have marked relocations associated with this CIE. */
320 unsigned int gc_mark : 1;
322 /* True if we have decided to turn an absolute LSDA encoding into
323 a PC-relative one. */
324 unsigned int make_lsda_relative : 1;
326 /* True if we have decided to turn an absolute personality
327 encoding into a PC-relative one. */
328 unsigned int make_per_encoding_relative : 1;
330 /* True if the CIE contains personality data and if that
331 data uses a PC-relative encoding. Always true when
332 make_per_encoding_relative is. */
333 unsigned int per_encoding_relative : 1;
335 /* True if we need to add an 'R' (FDE encoding) entry to the
336 CIE's augmentation data. */
337 unsigned int add_fde_encoding : 1;
339 /* True if we have merged this CIE with another. */
340 unsigned int merged : 1;
343 unsigned int pad1 : 18;
346 unsigned int reloc_index;
349 unsigned int new_offset;
350 unsigned int fde_encoding : 8;
351 unsigned int lsda_encoding : 8;
352 unsigned int lsda_offset : 8;
354 /* True if this entry represents a CIE, false if it represents an FDE. */
355 unsigned int cie : 1;
357 /* True if this entry is currently marked for removal. */
358 unsigned int removed : 1;
360 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
361 augmentation data, and an associated byte to each of the CIE's FDEs. */
362 unsigned int add_augmentation_size : 1;
364 /* True if we have decided to convert absolute FDE relocations into
365 relative ones. This applies to the first relocation in the FDE,
366 which is against the code that the FDE describes. */
367 unsigned int make_relative : 1;
370 unsigned int pad1 : 4;
372 unsigned int *set_loc;
375 struct eh_frame_sec_info
379 struct eh_cie_fde entry[1];
382 struct eh_frame_array_ent
391 #define DWARF2_EH_HDR 1
392 #define COMPACT_EH_HDR 2
394 /* Endian-neutral code indicating that a function cannot be unwound. */
395 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
397 struct dwarf_eh_frame_hdr_info
400 unsigned int fde_count;
401 /* TRUE if .eh_frame_hdr should contain the sorted search table.
402 We build it if we successfully read all .eh_frame input sections
403 and recognize them. */
405 struct eh_frame_array_ent *array;
408 struct compact_eh_frame_hdr_info
410 unsigned int allocated_entries;
411 /* eh_frame_entry fragments. */
415 struct eh_frame_hdr_info
418 unsigned int array_count;
419 bfd_boolean frame_hdr_is_compact;
422 struct dwarf_eh_frame_hdr_info dwarf;
423 struct compact_eh_frame_hdr_info compact;
428 /* Enum used to identify target specific extensions to the elf_obj_tdata
429 and elf_link_hash_table structures. Note the enums deliberately start
430 from 1 so that we can detect an uninitialized field. The generic value
431 is last so that additions to this enum do not need to modify more than
435 AARCH64_ELF_DATA = 1,
472 /* ELF linker hash table. */
474 struct elf_link_hash_table
476 struct bfd_link_hash_table root;
478 /* An identifier used to distinguish different target
479 specific extensions to this structure. */
480 enum elf_target_id hash_table_id;
482 /* Whether we have created the special dynamic sections required
483 when linking against or generating a shared object. */
484 bfd_boolean dynamic_sections_created;
486 /* True if this target has relocatable executables, so needs dynamic
488 bfd_boolean is_relocatable_executable;
490 /* The BFD used to hold special sections created by the linker.
491 This will be the first BFD found which requires these sections to
495 /* The value to use when initialising got.refcount/offset and
496 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
497 the values are refcounts. Set to init_got_offset/init_plt_offset
498 in size_dynamic_sections when the values may be offsets. */
499 union gotplt_union init_got_refcount;
500 union gotplt_union init_plt_refcount;
502 /* The value to use for got.refcount/offset and plt.refcount/offset
503 when the values may be offsets. Normally (bfd_vma) -1. */
504 union gotplt_union init_got_offset;
505 union gotplt_union init_plt_offset;
507 /* The number of symbols found in the link which must be put into
508 the .dynsym section. */
509 bfd_size_type dynsymcount;
511 /* The string table of dynamic symbols, which becomes the .dynstr
513 struct elf_strtab_hash *dynstr;
515 /* The number of buckets in the hash table in the .hash section.
516 This is based on the number of dynamic symbols. */
517 bfd_size_type bucketcount;
519 /* A linked list of DT_NEEDED names found in dynamic objects
520 included in the link. */
521 struct bfd_link_needed_list *needed;
523 /* Sections in the output bfd that provides a section symbol
524 to be used by relocations emitted against local symbols.
525 Most targets will not use data_index_section. */
526 asection *text_index_section;
527 asection *data_index_section;
529 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
530 struct elf_link_hash_entry *hgot;
532 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
533 struct elf_link_hash_entry *hplt;
535 /* The _DYNAMIC symbol. */
536 struct elf_link_hash_entry *hdynamic;
538 /* A pointer to information used to merge SEC_MERGE sections. */
541 /* Used to link stabs in sections. */
542 struct stab_info stab_info;
544 /* Used by eh_frame code when editing .eh_frame. */
545 struct eh_frame_hdr_info eh_info;
547 /* A linked list of local symbols to be added to .dynsym. */
548 struct elf_link_local_dynamic_entry *dynlocal;
550 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
551 objects included in the link. */
552 struct bfd_link_needed_list *runpath;
554 /* Cached first output tls section and size of PT_TLS segment. */
556 bfd_size_type tls_size;
558 /* A linked list of BFD's loaded in the link. */
559 struct elf_link_loaded_list *loaded;
561 /* Short-cuts to get to dynamic linker sections. */
573 /* Look up an entry in an ELF linker hash table. */
575 #define elf_link_hash_lookup(table, string, create, copy, follow) \
576 ((struct elf_link_hash_entry *) \
577 bfd_link_hash_lookup (&(table)->root, (string), (create), \
580 /* Traverse an ELF linker hash table. */
582 #define elf_link_hash_traverse(table, func, info) \
583 (bfd_link_hash_traverse \
585 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
588 /* Get the ELF linker hash table from a link_info structure. */
590 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
592 #define elf_hash_table_id(table) ((table) -> hash_table_id)
594 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
595 #define is_elf_hash_table(htab) \
596 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
598 /* Used by bfd_sym_from_r_symndx to cache a small number of local
600 #define LOCAL_SYM_CACHE_SIZE 32
604 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
605 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
608 /* Constant information held for an ELF backend. */
610 struct elf_size_info {
611 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
612 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
614 /* The size of entries in the .hash section. */
615 unsigned char sizeof_hash_entry;
617 /* The number of internal relocations to allocate per external
619 unsigned char int_rels_per_ext_rel;
620 /* We use some fixed size arrays. This should be large enough to
621 handle all back-ends. */
622 #define MAX_INT_RELS_PER_EXT_REL 3
624 unsigned char arch_size, log_file_align;
625 unsigned char elfclass, ev_current;
626 int (*write_out_phdrs)
627 (bfd *, const Elf_Internal_Phdr *, unsigned int);
629 (*write_shdrs_and_ehdr) (bfd *);
630 bfd_boolean (*checksum_contents)
631 (bfd * , void (*) (const void *, size_t, void *), void *);
633 (bfd *, asection *, void *);
634 bfd_boolean (*swap_symbol_in)
635 (bfd *, const void *, const void *, Elf_Internal_Sym *);
636 void (*swap_symbol_out)
637 (bfd *, const Elf_Internal_Sym *, void *, void *);
638 bfd_boolean (*slurp_reloc_table)
639 (bfd *, asection *, asymbol **, bfd_boolean);
640 long (*slurp_symbol_table)
641 (bfd *, asymbol **, bfd_boolean);
643 (bfd *, const void *, Elf_Internal_Dyn *);
645 (bfd *, const Elf_Internal_Dyn *, void *);
647 /* This function is called to swap in a REL relocation. If an
648 external relocation corresponds to more than one internal
649 relocation, then all relocations are swapped in at once. */
650 void (*swap_reloc_in)
651 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
653 /* This function is called to swap out a REL relocation. */
654 void (*swap_reloc_out)
655 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
657 /* This function is called to swap in a RELA relocation. If an
658 external relocation corresponds to more than one internal
659 relocation, then all relocations are swapped in at once. */
660 void (*swap_reloca_in)
661 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
663 /* This function is called to swap out a RELA relocation. */
664 void (*swap_reloca_out)
665 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
668 #define elf_symbol_from(ABFD,S) \
669 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
670 && (S)->the_bfd->tdata.elf_obj_data != 0) \
671 ? (elf_symbol_type *) (S) \
674 enum elf_reloc_type_class {
676 reloc_class_relative,
682 struct elf_reloc_cookie
684 Elf_Internal_Rela *rels, *rel, *relend;
685 Elf_Internal_Sym *locsyms;
689 struct elf_link_hash_entry **sym_hashes;
691 bfd_boolean bad_symtab;
694 /* The level of IRIX compatibility we're striving for. */
702 /* Mapping of ELF section names and types. */
703 struct bfd_elf_special_section
707 /* 0 means name must match PREFIX exactly.
708 -1 means name must start with PREFIX followed by an arbitrary string.
709 -2 means name must match PREFIX exactly or consist of PREFIX followed
710 by a dot then anything.
711 > 0 means name must start with the first PREFIX_LENGTH chars of
712 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
718 enum action_discarded
724 typedef asection * (*elf_gc_mark_hook_fn)
725 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
726 struct elf_link_hash_entry *, Elf_Internal_Sym *);
728 struct elf_backend_data
730 /* The architecture for this backend. */
731 enum bfd_architecture arch;
733 /* An identifier used to distinguish different target specific
734 extensions to elf_obj_tdata and elf_link_hash_table structures. */
735 enum elf_target_id target_id;
737 /* The ELF machine code (EM_xxxx) for this backend. */
738 int elf_machine_code;
743 /* The maximum page size for this backend. */
746 /* The minimum page size for this backend. An input object will not be
747 considered page aligned unless its sections are correctly aligned for
748 pages at least this large. May be smaller than maxpagesize. */
751 /* The common page size for this backend. */
752 bfd_vma commonpagesize;
754 /* The BFD flags applied to sections created for dynamic linking. */
755 flagword dynamic_sec_flags;
757 /* Architecture-specific data for this backend.
758 This is actually a pointer to some type like struct elf_ARCH_data. */
759 const void *arch_data;
761 /* A function to translate an ELF RELA relocation to a BFD arelent
763 void (*elf_info_to_howto)
764 (bfd *, arelent *, Elf_Internal_Rela *);
766 /* A function to translate an ELF REL relocation to a BFD arelent
768 void (*elf_info_to_howto_rel)
769 (bfd *, arelent *, Elf_Internal_Rela *);
771 /* A function to determine whether a symbol is global when
772 partitioning the symbol table into local and global symbols.
773 This should be NULL for most targets, in which case the correct
774 thing will be done. MIPS ELF, at least on the Irix 5, has
775 special requirements. */
776 bfd_boolean (*elf_backend_sym_is_global)
779 /* The remaining functions are hooks which are called only if they
782 /* A function to permit a backend specific check on whether a
783 particular BFD format is relevant for an object file, and to
784 permit the backend to set any global information it wishes. When
785 this is called elf_elfheader is set, but anything else should be
786 used with caution. If this returns FALSE, the check_format
787 routine will return a bfd_error_wrong_format error. */
788 bfd_boolean (*elf_backend_object_p)
791 /* A function to do additional symbol processing when reading the
792 ELF symbol table. This is where any processor-specific special
793 section indices are handled. */
794 void (*elf_backend_symbol_processing)
797 /* A function to do additional symbol processing after reading the
798 entire ELF symbol table. */
799 bfd_boolean (*elf_backend_symbol_table_processing)
800 (bfd *, elf_symbol_type *, unsigned int);
802 /* A function to set the type of the info field. Processor-specific
803 types should be handled here. */
804 int (*elf_backend_get_symbol_type)
805 (Elf_Internal_Sym *, int);
807 /* A function to return the linker hash table entry of a symbol that
808 might be satisfied by an archive symbol. */
809 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
810 (bfd *, struct bfd_link_info *, const char *);
812 /* Return true if local section symbols should have a non-null st_name.
813 NULL implies false. */
814 bfd_boolean (*elf_backend_name_local_section_symbols)
817 /* A function to do additional processing on the ELF section header
818 just before writing it out. This is used to set the flags and
819 type fields for some sections, or to actually write out data for
821 bfd_boolean (*elf_backend_section_processing)
822 (bfd *, Elf_Internal_Shdr *);
824 /* A function to handle unusual section types when creating BFD
825 sections from ELF sections. */
826 bfd_boolean (*elf_backend_section_from_shdr)
827 (bfd *, Elf_Internal_Shdr *, const char *, int);
829 /* A function to convert machine dependent ELF section header flags to
830 BFD internal section header flags. */
831 bfd_boolean (*elf_backend_section_flags)
832 (flagword *, const Elf_Internal_Shdr *);
834 /* A function that returns a struct containing ELF section flags and
835 type for the given BFD section. */
836 const struct bfd_elf_special_section * (*get_sec_type_attr)
839 /* A function to handle unusual program segment types when creating BFD
840 sections from ELF program segments. */
841 bfd_boolean (*elf_backend_section_from_phdr)
842 (bfd *, Elf_Internal_Phdr *, int, const char *);
844 /* A function to set up the ELF section header for a BFD section in
845 preparation for writing it out. This is where the flags and type
846 fields are set for unusual sections. */
847 bfd_boolean (*elf_backend_fake_sections)
848 (bfd *, Elf_Internal_Shdr *, asection *);
850 /* A function to get the ELF section index for a BFD section. If
851 this returns TRUE, the section was found. If it is a normal ELF
852 section, *RETVAL should be left unchanged. If it is not a normal
853 ELF section *RETVAL should be set to the SHN_xxxx index. */
854 bfd_boolean (*elf_backend_section_from_bfd_section)
855 (bfd *, asection *, int *retval);
857 /* If this field is not NULL, it is called by the add_symbols phase
858 of a link just before adding a symbol to the global linker hash
859 table. It may modify any of the fields as it wishes. If *NAME
860 is set to NULL, the symbol will be skipped rather than being
861 added to the hash table. This function is responsible for
862 handling all processor dependent symbol bindings and section
863 indices, and must set at least *FLAGS and *SEC for each processor
864 dependent case; failure to do so will cause a link error. */
865 bfd_boolean (*elf_add_symbol_hook)
866 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
867 const char **name, flagword *flags, asection **sec, bfd_vma *value);
869 /* If this field is not NULL, it is called by the elf_link_output_sym
870 phase of a link for each symbol which will appear in the object file.
871 On error, this function returns 0. 1 is returned when the symbol
872 should be output, 2 is returned when the symbol should be discarded. */
873 int (*elf_backend_link_output_symbol_hook)
874 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
875 asection *, struct elf_link_hash_entry *);
877 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
878 linker the first time it encounters a dynamic object in the link.
879 This function must create any sections required for dynamic
880 linking. The ABFD argument is a dynamic object. The .interp,
881 .dynamic, .dynsym, .dynstr, and .hash functions have already been
882 created, and this function may modify the section flags if
883 desired. This function will normally create the .got and .plt
884 sections, but different backends have different requirements. */
885 bfd_boolean (*elf_backend_create_dynamic_sections)
886 (bfd *abfd, struct bfd_link_info *info);
888 /* When creating a shared library, determine whether to omit the
889 dynamic symbol for the section. */
890 bfd_boolean (*elf_backend_omit_section_dynsym)
891 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
893 /* Return TRUE if relocations of targets are compatible to the extent
894 that CHECK_RELOCS will properly process them. PR 4424. */
895 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
897 /* The CHECK_RELOCS function is called by the add_symbols phase of
898 the ELF backend linker. It is called once for each section with
899 relocs of an object file, just after the symbols for the object
900 file have been added to the global linker hash table. The
901 function must look through the relocs and do any special handling
902 required. This generally means allocating space in the global
903 offset table, and perhaps allocating space for a reloc. The
904 relocs are always passed as Rela structures; if the section
905 actually uses Rel structures, the r_addend field will always be
907 bfd_boolean (*check_relocs)
908 (bfd *abfd, struct bfd_link_info *info, asection *o,
909 const Elf_Internal_Rela *relocs);
911 /* The CHECK_DIRECTIVES function is called once per input file by
912 the add_symbols phase of the ELF backend linker. The function
913 must inspect the bfd and create any additional symbols according
914 to any custom directives in the bfd. */
915 bfd_boolean (*check_directives)
916 (bfd *abfd, struct bfd_link_info *info);
918 /* The NOTICE_AS_NEEDED function is called as the linker is about to
919 handle an as-needed lib (ACT = notice_as_needed), and after the
920 linker has decided to keep the lib (ACT = notice_needed) or when
921 the lib is not needed (ACT = notice_not_needed). */
922 bfd_boolean (*notice_as_needed)
923 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
925 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
926 linker for every symbol which is defined by a dynamic object and
927 referenced by a regular object. This is called after all the
928 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
929 function has been called. The hash table entry should be
930 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
931 defined in a section from a dynamic object. Dynamic object
932 sections are not included in the final link, and this function is
933 responsible for changing the value to something which the rest of
934 the link can deal with. This will normally involve adding an
935 entry to the .plt or .got or some such section, and setting the
936 symbol to point to that. */
937 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
938 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
940 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
941 after all the linker input files have been seen but before the
942 section sizes have been set. This is called after
943 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
944 bfd_boolean (*elf_backend_always_size_sections)
945 (bfd *output_bfd, struct bfd_link_info *info);
947 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
948 linker after all the linker input files have been seen but before
949 the sections sizes have been set. This is called after
950 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
951 It is only called when linking against a dynamic object. It must
952 set the sizes of the dynamic sections, and may fill in their
953 contents as well. The generic ELF linker can handle the .dynsym,
954 .dynstr and .hash sections. This function must handle the
955 .interp section and any sections created by the
956 CREATE_DYNAMIC_SECTIONS entry point. */
957 bfd_boolean (*elf_backend_size_dynamic_sections)
958 (bfd *output_bfd, struct bfd_link_info *info);
960 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
961 we keep to use as a base for relocs and symbols. */
962 void (*elf_backend_init_index_section)
963 (bfd *output_bfd, struct bfd_link_info *info);
965 /* The RELOCATE_SECTION function is called by the ELF backend linker
966 to handle the relocations for a section.
968 The relocs are always passed as Rela structures; if the section
969 actually uses Rel structures, the r_addend field will always be
972 This function is responsible for adjust the section contents as
973 necessary, and (if using Rela relocs and generating a
974 relocatable output file) adjusting the reloc addend as
977 This function does not have to worry about setting the reloc
978 address or the reloc symbol index.
980 LOCAL_SYMS is a pointer to the swapped in local symbols.
982 LOCAL_SECTIONS is an array giving the section in the input file
983 corresponding to the st_shndx field of each local symbol.
985 The global hash table entry for the global symbols can be found
986 via elf_sym_hashes (input_bfd).
988 When generating relocatable output, this function must handle
989 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
990 going to be the section symbol corresponding to the output
991 section, which means that the addend must be adjusted
994 Returns FALSE on error, TRUE on success, 2 if successful and
995 relocations should be written for this section. */
996 int (*elf_backend_relocate_section)
997 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
998 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
999 Elf_Internal_Sym *local_syms, asection **local_sections);
1001 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1002 linker just before it writes a symbol out to the .dynsym section.
1003 The processor backend may make any required adjustment to the
1004 symbol. It may also take the opportunity to set contents of the
1005 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1006 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1007 on those symbols which are defined by a dynamic object. */
1008 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1009 (bfd *output_bfd, struct bfd_link_info *info,
1010 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1012 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1013 linker just before it writes all the dynamic sections out to the
1014 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1015 all dynamic symbols. */
1016 bfd_boolean (*elf_backend_finish_dynamic_sections)
1017 (bfd *output_bfd, struct bfd_link_info *info);
1019 /* A function to do any beginning processing needed for the ELF file
1020 before building the ELF headers and computing file positions. */
1021 void (*elf_backend_begin_write_processing)
1022 (bfd *, struct bfd_link_info *);
1024 /* A function to do any final processing needed for the ELF file
1025 before writing it out. The LINKER argument is TRUE if this BFD
1026 was created by the ELF backend linker. */
1027 void (*elf_backend_final_write_processing)
1028 (bfd *, bfd_boolean linker);
1030 /* This function is called by get_program_header_size. It should
1031 return the number of additional program segments which this BFD
1032 will need. It should return -1 on error. */
1033 int (*elf_backend_additional_program_headers)
1034 (bfd *, struct bfd_link_info *);
1036 /* This function is called to modify an existing segment map in a
1037 backend specific fashion. */
1038 bfd_boolean (*elf_backend_modify_segment_map)
1039 (bfd *, struct bfd_link_info *);
1041 /* This function is called to modify program headers just before
1042 they are written. */
1043 bfd_boolean (*elf_backend_modify_program_headers)
1044 (bfd *, struct bfd_link_info *);
1046 /* This function is called before section garbage collection to
1047 mark entry symbol sections. */
1049 (struct bfd_link_info *);
1051 /* This function is called during section garbage collection to
1052 mark sections that define global symbols. */
1053 bfd_boolean (*gc_mark_dynamic_ref)
1054 (struct elf_link_hash_entry *, void *);
1056 /* This function is called during section gc to discover the section a
1057 particular relocation refers to. */
1058 elf_gc_mark_hook_fn gc_mark_hook;
1060 /* This function, if defined, is called after the first gc marking pass
1061 to allow the backend to mark additional sections. */
1062 bfd_boolean (*gc_mark_extra_sections)
1063 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1065 /* This function, if defined, is called during the sweep phase of gc
1066 in order that a backend might update any data structures it might
1068 bfd_boolean (*gc_sweep_hook)
1069 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1071 /* This function, if defined, is called after the ELF headers have
1072 been created. This allows for things like the OS and ABI versions
1074 void (*elf_backend_post_process_headers)
1075 (bfd *, struct bfd_link_info *);
1077 /* This function, if defined, prints a symbol to file and returns the
1078 name of the symbol to be printed. It should return NULL to fall
1079 back to default symbol printing. */
1080 const char *(*elf_backend_print_symbol_all)
1081 (bfd *, void *, asymbol *);
1083 /* This function, if defined, is called after all local symbols and
1084 global symbols converted to locals are emitted into the symtab
1085 section. It allows the backend to emit special local symbols
1086 not handled in the hash table. */
1087 bfd_boolean (*elf_backend_output_arch_local_syms)
1088 (bfd *, struct bfd_link_info *, void *,
1089 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1090 struct elf_link_hash_entry *));
1092 /* This function, if defined, is called after all symbols are emitted
1093 into the symtab section. It allows the backend to emit special
1094 global symbols not handled in the hash table. */
1095 bfd_boolean (*elf_backend_output_arch_syms)
1096 (bfd *, struct bfd_link_info *, void *,
1097 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1098 struct elf_link_hash_entry *));
1100 /* Copy any information related to dynamic linking from a pre-existing
1101 symbol to a newly created symbol. Also called to copy flags and
1102 other back-end info to a weakdef, in which case the symbol is not
1103 newly created and plt/got refcounts and dynamic indices should not
1105 void (*elf_backend_copy_indirect_symbol)
1106 (struct bfd_link_info *, struct elf_link_hash_entry *,
1107 struct elf_link_hash_entry *);
1109 /* Modify any information related to dynamic linking such that the
1110 symbol is not exported. */
1111 void (*elf_backend_hide_symbol)
1112 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1114 /* A function to do additional symbol fixup, called by
1115 _bfd_elf_fix_symbol_flags. */
1116 bfd_boolean (*elf_backend_fixup_symbol)
1117 (struct bfd_link_info *, struct elf_link_hash_entry *);
1119 /* Merge the backend specific symbol attribute. */
1120 void (*elf_backend_merge_symbol_attribute)
1121 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1124 /* This function, if defined, will return a string containing the
1125 name of a target-specific dynamic tag. */
1126 char *(*elf_backend_get_target_dtag)
1129 /* Decide whether an undefined symbol is special and can be ignored.
1130 This is the case for OPTIONAL symbols on IRIX. */
1131 bfd_boolean (*elf_backend_ignore_undef_symbol)
1132 (struct elf_link_hash_entry *);
1134 /* Emit relocations. Overrides default routine for emitting relocs,
1135 except during a relocatable link, or if all relocs are being emitted. */
1136 bfd_boolean (*elf_backend_emit_relocs)
1137 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1138 struct elf_link_hash_entry **);
1140 /* Count relocations. Not called for relocatable links
1141 or if all relocs are being preserved in the output. */
1142 unsigned int (*elf_backend_count_relocs)
1143 (struct bfd_link_info *, asection *);
1145 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1146 by r_offset. If NULL, default to true. */
1147 bfd_boolean (*sort_relocs_p)
1150 /* This function, if defined, is called when an NT_PRSTATUS note is found
1152 bfd_boolean (*elf_backend_grok_prstatus)
1153 (bfd *, Elf_Internal_Note *);
1155 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1156 note is found in a core file. */
1157 bfd_boolean (*elf_backend_grok_psinfo)
1158 (bfd *, Elf_Internal_Note *);
1160 /* This function, if defined, is called to write a note to a corefile. */
1161 char *(*elf_backend_write_core_note)
1162 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1164 /* This function, if defined, is called to convert target-specific
1165 section flag names into hex values. */
1166 flagword (*elf_backend_lookup_section_flags_hook)
1169 /* This function returns class of a reloc type. */
1170 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1171 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1173 /* This function, if defined, removes information about discarded functions
1174 from other sections which mention them. */
1175 bfd_boolean (*elf_backend_discard_info)
1176 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1178 /* This function, if defined, signals that the function above has removed
1179 the discarded relocations for this section. */
1180 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1183 /* What to do when ld finds relocations against symbols defined in
1184 discarded sections. */
1185 unsigned int (*action_discarded)
1188 /* This function returns the width of FDE pointers in bytes, or 0 if
1189 that can't be determined for some reason. The default definition
1190 goes by the bfd's EI_CLASS. */
1191 unsigned int (*elf_backend_eh_frame_address_size)
1192 (bfd *, asection *);
1194 /* These functions tell elf-eh-frame whether to attempt to turn
1195 absolute or lsda encodings into pc-relative ones. The default
1196 definition enables these transformations. */
1197 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1198 (bfd *, struct bfd_link_info *, asection *);
1199 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1200 (bfd *, struct bfd_link_info *, asection *);
1202 /* This function returns an encoding after computing the encoded
1203 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1204 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1205 The default definition chooses a 32-bit PC-relative encoding. */
1206 bfd_byte (*elf_backend_encode_eh_address)
1207 (bfd *abfd, struct bfd_link_info *info,
1208 asection *osec, bfd_vma offset,
1209 asection *loc_sec, bfd_vma loc_offset,
1212 /* This function, if defined, may write out the given section.
1213 Returns TRUE if it did so and FALSE if the caller should. */
1214 bfd_boolean (*elf_backend_write_section)
1215 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1217 /* The level of IRIX compatibility we're striving for.
1218 MIPS ELF specific function. */
1219 irix_compat_t (*elf_backend_mips_irix_compat)
1222 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1223 (unsigned int, bfd_boolean);
1225 /* The swapping table to use when dealing with ECOFF information.
1226 Used for the MIPS ELF .mdebug section. */
1227 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1229 /* This function implements `bfd_elf_bfd_from_remote_memory';
1230 see elf.c, elfcode.h. */
1231 bfd *(*elf_backend_bfd_from_remote_memory)
1232 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1233 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1234 bfd_size_type len));
1236 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1238 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1240 /* Is symbol defined in common section? */
1241 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1243 /* Return a common section index for section. */
1244 unsigned int (*common_section_index) (asection *);
1246 /* Return a common section for section. */
1247 asection *(*common_section) (asection *);
1249 /* Return TRUE if we can merge 2 definitions. */
1250 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1251 const Elf_Internal_Sym *, asection **,
1252 bfd_boolean, bfd_boolean,
1253 bfd *, const asection *);
1255 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1256 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1258 /* Return TRUE if type is a function symbol type. */
1259 bfd_boolean (*is_function_type) (unsigned int type);
1261 /* If the ELF symbol SYM might be a function in SEC, return the
1262 function size and set *CODE_OFF to the function's entry point,
1263 otherwise return zero. */
1264 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1267 /* Return the section which RELOC_SEC applies to. */
1268 asection *(*get_reloc_section) (asection *reloc_sec);
1270 /* Used to handle bad SHF_LINK_ORDER input. */
1271 bfd_error_handler_type link_order_error_handler;
1273 /* Name of the PLT relocation section. */
1274 const char *relplt_name;
1276 /* Alternate EM_xxxx machine codes for this backend. */
1277 int elf_machine_alt1;
1278 int elf_machine_alt2;
1280 const struct elf_size_info *s;
1282 /* An array of target specific special sections. */
1283 const struct bfd_elf_special_section *special_sections;
1285 /* The size in bytes of the header for the GOT. This includes the
1286 so-called reserved entries on some systems. */
1287 bfd_vma got_header_size;
1289 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1290 otherwise by the local symbol with index SYMNDX in IBFD. */
1291 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1292 struct elf_link_hash_entry *h,
1293 bfd *ibfd, unsigned long symndx);
1295 /* The vendor name to use for a processor-standard attributes section. */
1296 const char *obj_attrs_vendor;
1298 /* The section name to use for a processor-standard attributes section. */
1299 const char *obj_attrs_section;
1301 /* Return 1, 2 or 3 to indicate what type of arguments a
1302 processor-specific tag takes. */
1303 int (*obj_attrs_arg_type) (int);
1305 /* The section type to use for an attributes section. */
1306 unsigned int obj_attrs_section_type;
1308 /* This function determines the order in which any attributes are
1309 written. It must be defined for input in the range
1310 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1311 is used in order to make unity easy). The returned value is the
1312 actual tag number to place in the input position. */
1313 int (*obj_attrs_order) (int);
1315 /* Handle merging unknown attributes; either warn and return TRUE,
1316 or give an error and return FALSE. */
1317 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1319 /* Encoding used for compact EH tables. */
1320 int (*compact_eh_encoding) (struct bfd_link_info *);
1322 /* Opcode representing no unwind. */
1323 int (*cant_unwind_opcode) (struct bfd_link_info *);
1325 /* This is non-zero if static TLS segments require a special alignment. */
1326 unsigned static_tls_alignment;
1328 /* Alignment for the PT_GNU_STACK segment. */
1329 unsigned stack_align;
1331 /* This is TRUE if the linker should act like collect and gather
1332 global constructors and destructors by name. This is TRUE for
1333 MIPS ELF because the Irix 5 tools can not handle the .init
1335 unsigned collect : 1;
1337 /* This is TRUE if the linker should ignore changes to the type of a
1338 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1339 record undefined functions as STT_OBJECT although the definitions
1341 unsigned type_change_ok : 1;
1343 /* Whether the backend may use REL relocations. (Some backends use
1344 both REL and RELA relocations, and this flag is set for those
1346 unsigned may_use_rel_p : 1;
1348 /* Whether the backend may use RELA relocations. (Some backends use
1349 both REL and RELA relocations, and this flag is set for those
1351 unsigned may_use_rela_p : 1;
1353 /* Whether the default relocation type is RELA. If a backend with
1354 this flag set wants REL relocations for a particular section,
1355 it must note that explicitly. Similarly, if this flag is clear,
1356 and the backend wants RELA relocations for a particular
1358 unsigned default_use_rela_p : 1;
1360 /* True if PLT and copy relocations should be RELA by default. */
1361 unsigned rela_plts_and_copies_p : 1;
1363 /* Set if RELA relocations for a relocatable link can be handled by
1364 generic code. Backends that set this flag need do nothing in the
1365 backend relocate_section routine for relocatable linking. */
1366 unsigned rela_normal : 1;
1368 /* TRUE if addresses "naturally" sign extend. This is used when
1369 swapping in from Elf32 when BFD64. */
1370 unsigned sign_extend_vma : 1;
1372 unsigned want_got_plt : 1;
1373 unsigned plt_readonly : 1;
1374 unsigned want_plt_sym : 1;
1375 unsigned plt_not_loaded : 1;
1376 unsigned plt_alignment : 4;
1377 unsigned can_gc_sections : 1;
1378 unsigned can_refcount : 1;
1379 unsigned want_got_sym : 1;
1380 unsigned want_dynbss : 1;
1382 /* Targets which do not support physical addressing often require
1383 that the p_paddr field in the section header to be set to zero.
1384 This field indicates whether this behavior is required. */
1385 unsigned want_p_paddr_set_to_zero : 1;
1387 /* True if an object file lacking a .note.GNU-stack section
1388 should be assumed to be requesting exec stack. At least one
1389 other file in the link needs to have a .note.GNU-stack section
1390 for a PT_GNU_STACK segment to be created. */
1391 unsigned default_execstack : 1;
1393 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1394 in length rather than sec->size in length, if sec->rawsize is
1395 non-zero and smaller than sec->size. */
1396 unsigned caches_rawsize : 1;
1398 /* Address of protected data defined in the shared library may be
1399 external, i.e., due to copy relocation. */
1400 unsigned extern_protected_data : 1;
1403 /* Information about reloc sections associated with a bfd_elf_section_data
1405 struct bfd_elf_section_reloc_data
1407 /* The ELF header for the reloc section associated with this
1409 Elf_Internal_Shdr *hdr;
1410 /* The number of relocations currently assigned to HDR. */
1412 /* The ELF section number of the reloc section. Only used for an
1415 /* Used by the backend linker to store the symbol hash table entries
1416 associated with relocs against global symbols. */
1417 struct elf_link_hash_entry **hashes;
1420 /* Information stored for each BFD section in an ELF file. This
1421 structure is allocated by elf_new_section_hook. */
1423 struct bfd_elf_section_data
1425 /* The ELF header for this section. */
1426 Elf_Internal_Shdr this_hdr;
1428 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1429 struct flag_info *section_flag_info;
1431 /* Information about the REL and RELA reloc sections associated
1432 with this section, if any. */
1433 struct bfd_elf_section_reloc_data rel, rela;
1435 /* The ELF section number of this section. */
1438 /* Used by the backend linker when generating a shared library to
1439 record the dynamic symbol index for a section symbol
1440 corresponding to this section. A value of 0 means that there is
1441 no dynamic symbol for this section. */
1444 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1445 asection *linked_to;
1447 /* A pointer to the swapped relocs. If the section uses REL relocs,
1448 rather than RELA, all the r_addend fields will be zero. This
1449 pointer may be NULL. It is used by the backend linker. */
1450 Elf_Internal_Rela *relocs;
1452 /* A pointer to a linked list tracking dynamic relocs copied for
1456 /* A pointer to the bfd section used for dynamic relocs. */
1460 /* Group name, if this section is a member of a group. */
1463 /* Group signature sym, if this is the SHT_GROUP section. */
1464 struct bfd_symbol *id;
1467 /* For a member of a group, points to the SHT_GROUP section.
1468 NULL for the SHT_GROUP section itself and non-group sections. */
1469 asection *sec_group;
1471 /* A linked list of member sections in the group. Circular when used by
1472 the linker. For the SHT_GROUP section, points at first member. */
1473 asection *next_in_group;
1475 /* The FDEs associated with this section. The u.fde.next_in_section
1476 field acts as a chain pointer. */
1477 struct eh_cie_fde *fde_list;
1479 /* Link from a text section to its .eh_frame_entry section. */
1480 asection *eh_frame_entry;
1482 /* A pointer used for various section optimizations. */
1486 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1487 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1488 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1489 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1490 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1491 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1492 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1493 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1494 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1495 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1497 #define xvec_get_elf_backend_data(xvec) \
1498 ((const struct elf_backend_data *) (xvec)->backend_data)
1500 #define get_elf_backend_data(abfd) \
1501 xvec_get_elf_backend_data ((abfd)->xvec)
1503 /* The least object attributes (within an attributes subsection) known
1504 for any target. Some code assumes that the value 0 is not used and
1505 the field for that attribute can instead be used as a marker to
1506 indicate that attributes have been initialized. */
1507 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1509 /* The maximum number of known object attributes for any target. */
1510 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1512 /* The value of an object attribute. The type indicates whether the attribute
1513 holds and integer, a string, or both. It can also indicate that there can
1514 be no default (i.e. all values must be written to file, even zero). */
1516 typedef struct obj_attribute
1518 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1519 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1520 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1522 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1523 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1524 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1531 typedef struct obj_attribute_list
1533 struct obj_attribute_list *next;
1536 } obj_attribute_list;
1538 /* Object attributes may either be defined by the processor ABI, index
1539 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1540 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1541 #define OBJ_ATTR_PROC 0
1542 #define OBJ_ATTR_GNU 1
1543 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1544 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1546 /* The following object attribute tags are taken as generic, for all
1547 targets and for "gnu" where there is no target standard. */
1554 Tag_compatibility = 32
1557 /* The following struct stores information about every SystemTap section
1558 found in the object file. */
1561 struct sdt_note *next;
1566 /* NT_GNU_BUILD_ID note type info for input BFDs. */
1573 /* tdata information grabbed from an elf core file. */
1574 struct core_elf_obj_tdata
1583 /* Extra tdata information held for output ELF BFDs. */
1584 struct output_elf_obj_tdata
1586 struct elf_segment_map *seg_map;
1587 struct elf_strtab_hash *strtab_ptr;
1589 /* STT_SECTION symbols for each section */
1590 asymbol **section_syms;
1592 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1594 asection *eh_frame_hdr;
1596 /* NT_GNU_BUILD_ID note type info. */
1599 bfd_boolean (*after_write_object_contents) (bfd *);
1604 /* Records the result of `get_program_header_size'. */
1605 bfd_size_type program_header_size;
1607 /* Used when laying out sections. */
1608 file_ptr next_file_pos;
1610 int num_section_syms;
1611 unsigned int shstrtab_section, strtab_section;
1613 /* Segment flags for the PT_GNU_STACK segment. */
1614 unsigned int stack_flags;
1616 /* This is set to TRUE if the object was created by the backend
1620 /* Used to determine if the e_flags field has been initialized */
1621 bfd_boolean flags_init;
1624 /* Some private data is stashed away for future use using the tdata pointer
1625 in the bfd structure. */
1627 struct elf_obj_tdata
1629 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1630 Elf_Internal_Shdr **elf_sect_ptr;
1631 Elf_Internal_Phdr *phdr;
1632 Elf_Internal_Shdr symtab_hdr;
1633 Elf_Internal_Shdr shstrtab_hdr;
1634 Elf_Internal_Shdr strtab_hdr;
1635 Elf_Internal_Shdr dynsymtab_hdr;
1636 Elf_Internal_Shdr dynstrtab_hdr;
1637 Elf_Internal_Shdr dynversym_hdr;
1638 Elf_Internal_Shdr dynverref_hdr;
1639 Elf_Internal_Shdr dynverdef_hdr;
1640 Elf_Internal_Shdr symtab_shndx_hdr;
1641 bfd_vma gp; /* The gp value */
1642 unsigned int gp_size; /* The gp size */
1643 unsigned int num_elf_sections; /* elf_sect_ptr size */
1645 /* A mapping from external symbols to entries in the linker hash
1646 table, used when linking. This is indexed by the symbol index
1647 minus the sh_info field of the symbol table header. */
1648 struct elf_link_hash_entry **sym_hashes;
1650 /* Track usage and final offsets of GOT entries for local symbols.
1651 This array is indexed by symbol index. Elements are used
1652 identically to "got" in struct elf_link_hash_entry. */
1655 bfd_signed_vma *refcounts;
1657 struct got_entry **ents;
1660 /* The linker ELF emulation code needs to let the backend ELF linker
1661 know what filename should be used for a dynamic object if the
1662 dynamic object is found using a search. The emulation code then
1663 sometimes needs to know what name was actually used. Until the
1664 file has been added to the linker symbol table, this field holds
1665 the name the linker wants. After it has been added, it holds the
1666 name actually used, which will be the DT_SONAME entry if there is
1668 const char *dt_name;
1670 /* The linker emulation needs to know what audit libs
1671 are used by a dynamic object. */
1672 const char *dt_audit;
1674 /* Used by find_nearest_line entry point. */
1677 /* A place to stash dwarf1 info for this bfd. */
1678 struct dwarf1_debug *dwarf1_find_line_info;
1680 /* A place to stash dwarf2 info for this bfd. */
1681 void *dwarf2_find_line_info;
1683 /* Stash away info for yet another find line/function variant. */
1684 void *elf_find_function_cache;
1686 /* Number of symbol version definitions we are about to emit. */
1687 unsigned int cverdefs;
1689 /* Number of symbol version references we are about to emit. */
1690 unsigned int cverrefs;
1692 /* Symbol version definitions in external objects. */
1693 Elf_Internal_Verdef *verdef;
1695 /* Symbol version references to external objects. */
1696 Elf_Internal_Verneed *verref;
1698 /* A pointer to the .eh_frame section. */
1699 asection *eh_frame_section;
1701 /* Symbol buffer. */
1704 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1705 obj_attribute_list *other_obj_attributes[2];
1707 /* NT_GNU_BUILD_ID note type. */
1708 struct elf_build_id *build_id;
1710 /* Linked-list containing information about every Systemtap section
1711 found in the object file. Each section corresponds to one entry
1713 struct sdt_note *sdt_note_head;
1715 Elf_Internal_Shdr **group_sect_ptr;
1718 unsigned int symtab_section, symtab_shndx_section, dynsymtab_section;
1719 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1721 /* An identifier used to distinguish different target
1722 specific extensions to this structure. */
1723 enum elf_target_id object_id;
1725 /* Whether a dyanmic object was specified normally on the linker
1726 command line, or was specified when --as-needed was in effect,
1727 or was found via a DT_NEEDED entry. */
1728 enum dynamic_lib_link_class dyn_lib_class;
1730 /* Irix 5 often screws up the symbol table, sorting local symbols
1731 after global symbols. This flag is set if the symbol table in
1732 this BFD appears to be screwed up. If it is, we ignore the
1733 sh_info field in the symbol table header, and always read all the
1735 bfd_boolean bad_symtab;
1737 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1738 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1739 field in the ELF header structure. */
1740 bfd_boolean has_gnu_symbols;
1742 /* Information grabbed from an elf core file. */
1743 struct core_elf_obj_tdata *core;
1745 /* More information held for output ELF BFDs. */
1746 struct output_elf_obj_tdata *o;
1749 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1751 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1752 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1753 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1754 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1755 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1756 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1757 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1758 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1759 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1760 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1761 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1762 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1763 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1764 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1765 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1766 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1767 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1768 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1769 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1770 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1771 #define elf_eh_frame_section(bfd) \
1772 (elf_tdata(bfd) -> eh_frame_section)
1773 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1774 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1775 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1776 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1777 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1778 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1779 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1780 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1781 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1782 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1783 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1784 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1785 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1786 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1787 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1788 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1789 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1790 #define elf_known_obj_attributes_proc(bfd) \
1791 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1792 #define elf_other_obj_attributes_proc(bfd) \
1793 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1795 extern void _bfd_elf_swap_verdef_in
1796 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1797 extern void _bfd_elf_swap_verdef_out
1798 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1799 extern void _bfd_elf_swap_verdaux_in
1800 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1801 extern void _bfd_elf_swap_verdaux_out
1802 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1803 extern void _bfd_elf_swap_verneed_in
1804 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1805 extern void _bfd_elf_swap_verneed_out
1806 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1807 extern void _bfd_elf_swap_vernaux_in
1808 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1809 extern void _bfd_elf_swap_vernaux_out
1810 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1811 extern void _bfd_elf_swap_versym_in
1812 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1813 extern void _bfd_elf_swap_versym_out
1814 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1816 extern unsigned int _bfd_elf_section_from_bfd_section
1817 (bfd *, asection *);
1818 extern char *bfd_elf_string_from_elf_section
1819 (bfd *, unsigned, unsigned);
1820 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1821 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1822 Elf_External_Sym_Shndx *);
1823 extern const char *bfd_elf_sym_name
1824 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1826 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1828 extern bfd_boolean _bfd_elf_print_private_bfd_data
1830 const char * _bfd_elf_get_symbol_version_string
1831 (bfd *, asymbol *, bfd_boolean *);
1832 extern void bfd_elf_print_symbol
1833 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1835 extern unsigned int _bfd_elf_eh_frame_address_size
1836 (bfd *, asection *);
1837 extern bfd_byte _bfd_elf_encode_eh_address
1838 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1839 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1840 extern bfd_boolean _bfd_elf_can_make_relative
1841 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1843 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1844 (const struct bfd_link_info *, const asection *,
1845 const Elf_Internal_Rela *);
1846 extern bfd_vma _bfd_elf_rela_local_sym
1847 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1848 extern bfd_vma _bfd_elf_rel_local_sym
1849 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1850 extern bfd_vma _bfd_elf_section_offset
1851 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1853 extern unsigned long bfd_elf_hash
1855 extern unsigned long bfd_elf_gnu_hash
1858 extern bfd_reloc_status_type bfd_elf_generic_reloc
1859 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1860 extern bfd_boolean bfd_elf_allocate_object
1861 (bfd *, size_t, enum elf_target_id);
1862 extern bfd_boolean bfd_elf_make_object
1864 extern bfd_boolean bfd_elf_mkcorefile
1866 extern bfd_boolean _bfd_elf_make_section_from_shdr
1867 (bfd *, Elf_Internal_Shdr *, const char *, int);
1868 extern bfd_boolean _bfd_elf_make_section_from_phdr
1869 (bfd *, Elf_Internal_Phdr *, int, const char *);
1870 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1871 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1872 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1874 extern void _bfd_elf_link_hash_table_free
1876 extern void _bfd_elf_link_hash_copy_indirect
1877 (struct bfd_link_info *, struct elf_link_hash_entry *,
1878 struct elf_link_hash_entry *);
1879 extern void _bfd_elf_link_hash_hide_symbol
1880 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1881 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1882 (struct bfd_link_info *, struct elf_link_hash_entry *);
1883 extern bfd_boolean _bfd_elf_link_hash_table_init
1884 (struct elf_link_hash_table *, bfd *,
1885 struct bfd_hash_entry *(*)
1886 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1887 unsigned int, enum elf_target_id);
1888 extern bfd_boolean _bfd_elf_slurp_version_tables
1889 (bfd *, bfd_boolean);
1890 extern bfd_boolean _bfd_elf_merge_sections
1891 (bfd *, struct bfd_link_info *);
1892 extern bfd_boolean _bfd_elf_match_sections_by_type
1893 (bfd *, const asection *, bfd *, const asection *);
1894 extern bfd_boolean bfd_elf_is_group_section
1895 (bfd *, const struct bfd_section *);
1896 extern bfd_boolean _bfd_elf_section_already_linked
1897 (bfd *, asection *, struct bfd_link_info *);
1898 extern void bfd_elf_set_group_contents
1899 (bfd *, asection *, void *);
1900 extern asection *_bfd_elf_check_kept_section
1901 (asection *, struct bfd_link_info *);
1902 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1903 extern void _bfd_elf_copy_link_hash_symbol_type
1904 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1905 extern bfd_boolean _bfd_elf_size_group_sections
1906 (struct bfd_link_info *);
1907 extern bfd_boolean _bfd_elf_fixup_group_sections
1908 (bfd *, asection *);
1909 extern bfd_boolean _bfd_elf_copy_private_header_data
1911 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1912 (bfd *, asymbol *, bfd *, asymbol *);
1913 #define _bfd_generic_init_private_section_data \
1914 _bfd_elf_init_private_section_data
1915 extern bfd_boolean _bfd_elf_init_private_section_data
1916 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1917 extern bfd_boolean _bfd_elf_copy_private_section_data
1918 (bfd *, asection *, bfd *, asection *);
1919 extern bfd_boolean _bfd_elf_write_object_contents
1921 extern bfd_boolean _bfd_elf_write_corefile_contents
1923 extern bfd_boolean _bfd_elf_set_section_contents
1924 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1925 extern long _bfd_elf_get_symtab_upper_bound
1927 extern long _bfd_elf_canonicalize_symtab
1928 (bfd *, asymbol **);
1929 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1931 extern long _bfd_elf_canonicalize_dynamic_symtab
1932 (bfd *, asymbol **);
1933 extern long _bfd_elf_get_synthetic_symtab
1934 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1935 extern long _bfd_elf_get_reloc_upper_bound
1937 extern long _bfd_elf_canonicalize_reloc
1938 (bfd *, sec_ptr, arelent **, asymbol **);
1939 extern asection * _bfd_elf_get_dynamic_reloc_section
1940 (bfd *, asection *, bfd_boolean);
1941 extern asection * _bfd_elf_make_dynamic_reloc_section
1942 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1943 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1945 extern long _bfd_elf_canonicalize_dynamic_reloc
1946 (bfd *, arelent **, asymbol **);
1947 extern asymbol *_bfd_elf_make_empty_symbol
1949 extern void _bfd_elf_get_symbol_info
1950 (bfd *, asymbol *, symbol_info *);
1951 extern bfd_boolean _bfd_elf_is_local_label_name
1952 (bfd *, const char *);
1953 extern alent *_bfd_elf_get_lineno
1955 extern bfd_boolean _bfd_elf_set_arch_mach
1956 (bfd *, enum bfd_architecture, unsigned long);
1957 extern bfd_boolean _bfd_elf_find_nearest_line
1958 (bfd *, asymbol **, asection *, bfd_vma,
1959 const char **, const char **, unsigned int *, unsigned int *);
1960 extern bfd_boolean _bfd_elf_find_line
1961 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1962 extern bfd_boolean _bfd_elf_find_inliner_info
1963 (bfd *, const char **, const char **, unsigned int *);
1964 extern bfd_boolean _bfd_elf_find_function
1965 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
1966 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1967 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1968 extern int _bfd_elf_sizeof_headers
1969 (bfd *, struct bfd_link_info *);
1970 extern bfd_boolean _bfd_elf_new_section_hook
1971 (bfd *, asection *);
1972 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1973 (const char *, const struct bfd_elf_special_section *, unsigned int);
1974 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1975 (bfd *, asection *);
1977 /* If the target doesn't have reloc handling written yet: */
1978 extern void _bfd_elf_no_info_to_howto
1979 (bfd *, arelent *, Elf_Internal_Rela *);
1981 extern bfd_boolean bfd_section_from_shdr
1982 (bfd *, unsigned int shindex);
1983 extern bfd_boolean bfd_section_from_phdr
1984 (bfd *, Elf_Internal_Phdr *, int);
1986 extern int _bfd_elf_symbol_from_bfd_symbol
1987 (bfd *, asymbol **);
1989 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1990 (struct sym_cache *, bfd *, unsigned long);
1991 extern asection *bfd_section_from_elf_index
1992 (bfd *, unsigned int);
1993 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1996 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1998 extern void _bfd_elf_strtab_free
1999 (struct elf_strtab_hash *);
2000 extern bfd_size_type _bfd_elf_strtab_add
2001 (struct elf_strtab_hash *, const char *, bfd_boolean);
2002 extern void _bfd_elf_strtab_addref
2003 (struct elf_strtab_hash *, bfd_size_type);
2004 extern void _bfd_elf_strtab_delref
2005 (struct elf_strtab_hash *, bfd_size_type);
2006 extern unsigned int _bfd_elf_strtab_refcount
2007 (struct elf_strtab_hash *, bfd_size_type);
2008 extern void _bfd_elf_strtab_clear_all_refs
2009 (struct elf_strtab_hash *tab);
2010 extern void _bfd_elf_strtab_restore_size
2011 (struct elf_strtab_hash *, bfd_size_type);
2012 extern bfd_size_type _bfd_elf_strtab_size
2013 (struct elf_strtab_hash *);
2014 extern bfd_size_type _bfd_elf_strtab_offset
2015 (struct elf_strtab_hash *, bfd_size_type);
2016 extern bfd_boolean _bfd_elf_strtab_emit
2017 (bfd *, struct elf_strtab_hash *);
2018 extern void _bfd_elf_strtab_finalize
2019 (struct elf_strtab_hash *);
2021 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2022 (bfd *, struct bfd_link_info *);
2023 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2024 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2025 extern void _bfd_elf_parse_eh_frame
2026 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2027 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2028 (struct bfd_link_info *info);
2030 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2031 (bfd *, struct bfd_link_info *, asection *,
2032 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2033 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2034 (bfd *, struct bfd_link_info *);
2035 extern bfd_vma _bfd_elf_eh_frame_section_offset
2036 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2037 extern bfd_boolean _bfd_elf_write_section_eh_frame
2038 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2039 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2040 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2041 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2042 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2043 (bfd *, struct bfd_link_info *);
2044 extern bfd_boolean _bfd_elf_eh_frame_present
2045 (struct bfd_link_info *);
2046 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2047 (struct bfd_link_info *);
2048 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2049 (struct bfd_link_info *);
2051 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2053 extern long _bfd_elf_link_lookup_local_dynindx
2054 (struct bfd_link_info *, bfd *, long);
2055 extern bfd_boolean _bfd_elf_compute_section_file_positions
2056 (bfd *, struct bfd_link_info *);
2057 extern file_ptr _bfd_elf_assign_file_position_for_section
2058 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2060 extern bfd_boolean _bfd_elf_validate_reloc
2063 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2064 (bfd *, struct bfd_link_info *);
2065 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2066 (bfd *, struct bfd_link_info *, asection *);
2067 extern bfd_boolean _bfd_elf_create_dynamic_sections
2068 (bfd *, struct bfd_link_info *);
2069 extern bfd_boolean _bfd_elf_create_got_section
2070 (bfd *, struct bfd_link_info *);
2071 extern asection *_bfd_elf_section_for_symbol
2072 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2073 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2074 (bfd *, struct bfd_link_info *, asection *, const char *);
2075 extern void _bfd_elf_init_1_index_section
2076 (bfd *, struct bfd_link_info *);
2077 extern void _bfd_elf_init_2_index_sections
2078 (bfd *, struct bfd_link_info *);
2080 extern bfd_boolean _bfd_elfcore_make_pseudosection
2081 (bfd *, char *, size_t, ufile_ptr);
2082 extern char *_bfd_elfcore_strndup
2083 (bfd *, char *, size_t);
2085 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2086 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2088 extern bfd_boolean _bfd_elf_link_output_relocs
2089 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2090 struct elf_link_hash_entry **);
2092 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2093 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2095 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2096 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2098 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2099 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2101 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2102 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2104 extern bfd_boolean _bfd_elf_setup_sections
2107 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2109 extern const bfd_target *bfd_elf32_object_p
2111 extern const bfd_target *bfd_elf32_core_file_p
2113 extern char *bfd_elf32_core_file_failing_command
2115 extern int bfd_elf32_core_file_failing_signal
2117 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2119 extern int bfd_elf32_core_file_pid
2122 extern bfd_boolean bfd_elf32_swap_symbol_in
2123 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2124 extern void bfd_elf32_swap_symbol_out
2125 (bfd *, const Elf_Internal_Sym *, void *, void *);
2126 extern void bfd_elf32_swap_reloc_in
2127 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2128 extern void bfd_elf32_swap_reloc_out
2129 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2130 extern void bfd_elf32_swap_reloca_in
2131 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2132 extern void bfd_elf32_swap_reloca_out
2133 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2134 extern void bfd_elf32_swap_phdr_in
2135 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2136 extern void bfd_elf32_swap_phdr_out
2137 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2138 extern void bfd_elf32_swap_dyn_in
2139 (bfd *, const void *, Elf_Internal_Dyn *);
2140 extern void bfd_elf32_swap_dyn_out
2141 (bfd *, const Elf_Internal_Dyn *, void *);
2142 extern long bfd_elf32_slurp_symbol_table
2143 (bfd *, asymbol **, bfd_boolean);
2144 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2146 extern int bfd_elf32_write_out_phdrs
2147 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2148 extern bfd_boolean bfd_elf32_checksum_contents
2149 (bfd * , void (*) (const void *, size_t, void *), void *);
2150 extern void bfd_elf32_write_relocs
2151 (bfd *, asection *, void *);
2152 extern bfd_boolean bfd_elf32_slurp_reloc_table
2153 (bfd *, asection *, asymbol **, bfd_boolean);
2155 extern const bfd_target *bfd_elf64_object_p
2157 extern const bfd_target *bfd_elf64_core_file_p
2159 extern char *bfd_elf64_core_file_failing_command
2161 extern int bfd_elf64_core_file_failing_signal
2163 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2165 extern int bfd_elf64_core_file_pid
2168 extern bfd_boolean bfd_elf64_swap_symbol_in
2169 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2170 extern void bfd_elf64_swap_symbol_out
2171 (bfd *, const Elf_Internal_Sym *, void *, void *);
2172 extern void bfd_elf64_swap_reloc_in
2173 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2174 extern void bfd_elf64_swap_reloc_out
2175 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2176 extern void bfd_elf64_swap_reloca_in
2177 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2178 extern void bfd_elf64_swap_reloca_out
2179 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2180 extern void bfd_elf64_swap_phdr_in
2181 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2182 extern void bfd_elf64_swap_phdr_out
2183 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2184 extern void bfd_elf64_swap_dyn_in
2185 (bfd *, const void *, Elf_Internal_Dyn *);
2186 extern void bfd_elf64_swap_dyn_out
2187 (bfd *, const Elf_Internal_Dyn *, void *);
2188 extern long bfd_elf64_slurp_symbol_table
2189 (bfd *, asymbol **, bfd_boolean);
2190 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2192 extern int bfd_elf64_write_out_phdrs
2193 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2194 extern bfd_boolean bfd_elf64_checksum_contents
2195 (bfd * , void (*) (const void *, size_t, void *), void *);
2196 extern void bfd_elf64_write_relocs
2197 (bfd *, asection *, void *);
2198 extern bfd_boolean bfd_elf64_slurp_reloc_table
2199 (bfd *, asection *, asymbol **, bfd_boolean);
2201 extern bfd_boolean _bfd_elf_default_relocs_compatible
2202 (const bfd_target *, const bfd_target *);
2204 extern bfd_boolean _bfd_elf_relocs_compatible
2205 (const bfd_target *, const bfd_target *);
2206 extern bfd_boolean _bfd_elf_notice_as_needed
2207 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2209 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2210 (bfd *, struct bfd_link_info *, const char *);
2211 extern bfd_boolean bfd_elf_link_add_symbols
2212 (bfd *, struct bfd_link_info *);
2213 extern bfd_boolean _bfd_elf_add_dynamic_entry
2214 (struct bfd_link_info *, bfd_vma, bfd_vma);
2216 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2217 (struct bfd_link_info *, struct elf_link_hash_entry *);
2219 extern int bfd_elf_link_record_local_dynamic_symbol
2220 (struct bfd_link_info *, bfd *, long);
2222 extern bfd_boolean _bfd_elf_close_and_cleanup
2225 extern bfd_boolean _bfd_elf_common_definition
2226 (Elf_Internal_Sym *);
2228 extern unsigned int _bfd_elf_common_section_index
2231 extern asection *_bfd_elf_common_section
2234 extern bfd_vma _bfd_elf_default_got_elt_size
2235 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2238 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2239 (bfd *, arelent *, struct bfd_symbol *, void *,
2240 asection *, bfd *, char **);
2242 extern bfd_boolean bfd_elf_final_link
2243 (bfd *, struct bfd_link_info *);
2245 extern void _bfd_elf_gc_keep
2246 (struct bfd_link_info *info);
2248 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2249 (struct elf_link_hash_entry *h, void *inf);
2251 extern bfd_boolean bfd_elf_gc_sections
2252 (bfd *, struct bfd_link_info *);
2254 extern bfd_boolean bfd_elf_gc_record_vtinherit
2255 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2257 extern bfd_boolean bfd_elf_gc_record_vtentry
2258 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2260 extern asection *_bfd_elf_gc_mark_hook
2261 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2262 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2264 extern asection *_bfd_elf_gc_mark_rsec
2265 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2266 struct elf_reloc_cookie *);
2268 extern bfd_boolean _bfd_elf_gc_mark_reloc
2269 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2270 struct elf_reloc_cookie *);
2272 extern bfd_boolean _bfd_elf_gc_mark_fdes
2273 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2274 struct elf_reloc_cookie *);
2276 extern bfd_boolean _bfd_elf_gc_mark
2277 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2279 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2280 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2282 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2283 (bfd *, struct bfd_link_info *);
2285 extern bfd_boolean bfd_elf_gc_common_final_link
2286 (bfd *, struct bfd_link_info *);
2288 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2291 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2292 (bfd *, asection *);
2294 extern bfd_boolean _bfd_elf_map_sections_to_segments
2295 (bfd *, struct bfd_link_info *);
2297 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2299 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2302 extern asection *_bfd_elf_get_reloc_section (asection *);
2304 extern int bfd_elf_get_default_section_type (flagword);
2306 extern bfd_boolean bfd_elf_lookup_section_flags
2307 (struct bfd_link_info *, struct flag_info *, asection *);
2309 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2310 (bfd * abfd, asection * section);
2312 /* Exported interface for writing elf corefile notes. */
2313 extern char *elfcore_write_note
2314 (bfd *, char *, int *, const char *, int, const void *, int);
2315 extern char *elfcore_write_prpsinfo
2316 (bfd *, char *, int *, const char *, const char *);
2317 extern char *elfcore_write_prstatus
2318 (bfd *, char *, int *, long, int, const void *);
2319 extern char * elfcore_write_pstatus
2320 (bfd *, char *, int *, long, int, const void *);
2321 extern char *elfcore_write_prfpreg
2322 (bfd *, char *, int *, const void *, int);
2323 extern char *elfcore_write_prxfpreg
2324 (bfd *, char *, int *, const void *, int);
2325 extern char *elfcore_write_xstatereg
2326 (bfd *, char *, int *, const void *, int);
2327 extern char *elfcore_write_ppc_vmx
2328 (bfd *, char *, int *, const void *, int);
2329 extern char *elfcore_write_ppc_vsx
2330 (bfd *, char *, int *, const void *, int);
2331 extern char *elfcore_write_s390_timer
2332 (bfd *, char *, int *, const void *, int);
2333 extern char *elfcore_write_s390_todcmp
2334 (bfd *, char *, int *, const void *, int);
2335 extern char *elfcore_write_s390_todpreg
2336 (bfd *, char *, int *, const void *, int);
2337 extern char *elfcore_write_s390_ctrs
2338 (bfd *, char *, int *, const void *, int);
2339 extern char *elfcore_write_s390_prefix
2340 (bfd *, char *, int *, const void *, int);
2341 extern char *elfcore_write_s390_last_break
2342 (bfd *, char *, int *, const void *, int);
2343 extern char *elfcore_write_s390_system_call
2344 (bfd *, char *, int *, const void *, int);
2345 extern char *elfcore_write_s390_tdb
2346 (bfd *, char *, int *, const void *, int);
2347 extern char *elfcore_write_s390_vxrs_low
2348 (bfd *, char *, int *, const void *, int);
2349 extern char *elfcore_write_s390_vxrs_high
2350 (bfd *, char *, int *, const void *, int);
2351 extern char *elfcore_write_arm_vfp
2352 (bfd *, char *, int *, const void *, int);
2353 extern char *elfcore_write_aarch_tls
2354 (bfd *, char *, int *, const void *, int);
2355 extern char *elfcore_write_aarch_hw_break
2356 (bfd *, char *, int *, const void *, int);
2357 extern char *elfcore_write_aarch_hw_watch
2358 (bfd *, char *, int *, const void *, int);
2359 extern char *elfcore_write_lwpstatus
2360 (bfd *, char *, int *, long, int, const void *);
2361 extern char *elfcore_write_register_note
2362 (bfd *, char *, int *, const char *, const void *, int);
2364 /* Internal structure which holds information to be included in the
2365 PRPSINFO section of Linux core files.
2367 This is an "internal" structure in the sense that it should be used
2368 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2369 function), so things like endianess shouldn't be an issue. This
2370 structure will eventually be converted in one of the
2371 `elf_external_linux_*' structures and written out to an output bfd
2372 by one of the functions declared below. */
2374 struct elf_internal_linux_prpsinfo
2376 char pr_state; /* Numeric process state. */
2377 char pr_sname; /* Char for pr_state. */
2378 char pr_zomb; /* Zombie. */
2379 char pr_nice; /* Nice val. */
2380 unsigned long pr_flag; /* Flags. */
2381 unsigned int pr_uid;
2382 unsigned int pr_gid;
2383 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2384 char pr_fname[16 + 1]; /* Filename of executable. */
2385 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2388 /* Linux/most 32-bit archs. */
2389 extern char *elfcore_write_linux_prpsinfo32
2390 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2392 /* Linux/most 64-bit archs. */
2393 extern char *elfcore_write_linux_prpsinfo64
2394 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2396 /* Linux/PPC32 uses different layout compared to most archs. */
2397 extern char *elfcore_write_ppc_linux_prpsinfo32
2398 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2400 extern bfd *_bfd_elf32_bfd_from_remote_memory
2401 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2402 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2403 extern bfd *_bfd_elf64_bfd_from_remote_memory
2404 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2405 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2407 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2408 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2409 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2410 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2411 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2412 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2413 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2414 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2415 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2416 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2418 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2419 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2422 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2423 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2424 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2425 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2426 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2427 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2428 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2429 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2431 /* The linker may need to keep track of the number of relocs that it
2432 decides to copy as dynamic relocs in check_relocs for each symbol.
2433 This is so that it can later discard them if they are found to be
2434 unnecessary. We can store the information in a field extending the
2435 regular ELF linker hash table. */
2437 struct elf_dyn_relocs
2439 struct elf_dyn_relocs *next;
2441 /* The input section of the reloc. */
2444 /* Total number of relocs copied for the input section. */
2445 bfd_size_type count;
2447 /* Number of pc-relative relocs copied for the input section. */
2448 bfd_size_type pc_count;
2451 extern bfd_boolean _bfd_elf_create_ifunc_sections
2452 (bfd *, struct bfd_link_info *);
2453 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2454 (struct bfd_link_info *, struct elf_link_hash_entry *,
2455 struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int);
2456 extern long _bfd_elf_ifunc_get_synthetic_symtab
2457 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
2458 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
2460 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2461 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2463 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2464 extern bfd_vma elf64_r_sym (bfd_vma);
2465 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2466 extern bfd_vma elf32_r_sym (bfd_vma);
2468 /* Large common section. */
2469 extern asection _bfd_elf_large_com_section;
2471 /* Hash for local symbol with the first section id, ID, in the input
2472 file and the local symbol index, SYM. */
2473 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2474 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2475 ^ (SYM) ^ ((ID) >> 16))
2477 /* This is the condition under which finish_dynamic_symbol will be called.
2478 If our finish_dynamic_symbol isn't called, we'll need to do something
2479 about initializing any .plt and .got entries in relocate_section. */
2480 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2482 && ((SHARED) || !(H)->forced_local) \
2483 && ((H)->dynindx != -1 || (H)->forced_local))
2485 /* This macro is to avoid lots of duplicated code in the body
2486 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2487 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2488 r_symndx, symtab_hdr, sym_hashes, \
2489 h, sec, relocation, \
2490 unresolved_reloc, warned, ignored) \
2493 /* It seems this can happen with erroneous or unsupported \
2494 input (mixing a.out and elf in an archive, for example.) */ \
2495 if (sym_hashes == NULL) \
2498 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2500 if (info->wrap_hash != NULL \
2501 && (input_section->flags & SEC_DEBUGGING) != 0) \
2502 h = ((struct elf_link_hash_entry *) \
2503 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2505 while (h->root.type == bfd_link_hash_indirect \
2506 || h->root.type == bfd_link_hash_warning) \
2507 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2511 unresolved_reloc = FALSE; \
2513 if (h->root.type == bfd_link_hash_defined \
2514 || h->root.type == bfd_link_hash_defweak) \
2516 sec = h->root.u.def.section; \
2518 || sec->output_section == NULL) \
2519 /* Set a flag that will be cleared later if we find a \
2520 relocation value for this symbol. output_section \
2521 is typically NULL for symbols satisfied by a shared \
2523 unresolved_reloc = TRUE; \
2525 relocation = (h->root.u.def.value \
2526 + sec->output_section->vma \
2527 + sec->output_offset); \
2529 else if (h->root.type == bfd_link_hash_undefweak) \
2531 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2532 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2534 else if (!info->relocatable) \
2537 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2538 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2539 if (!info->callbacks->undefined_symbol (info, \
2540 h->root.root.string, \
2543 rel->r_offset, err)) \
2547 (void) unresolved_reloc; \
2553 /* This macro is to avoid lots of duplicated code in the body of the
2554 loop over relocations in xxx_relocate_section() in the various
2557 Handle relocations against symbols from removed linkonce sections,
2558 or sections discarded by a linker script. When doing a relocatable
2559 link, we remove such relocations. Otherwise, we just want the
2560 section contents zeroed and avoid any special processing. */
2561 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2562 rel, count, relend, \
2563 howto, index, contents) \
2566 _bfd_clear_contents (howto, input_bfd, input_section, \
2567 contents + rel[index].r_offset); \
2569 if (info->relocatable \
2570 && (input_section->flags & SEC_DEBUGGING)) \
2572 /* Only remove relocations in debug sections since other \
2573 sections may require relocations. */ \
2574 Elf_Internal_Shdr *rel_hdr; \
2576 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2578 /* Avoid empty output section. */ \
2579 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2581 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2582 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2583 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2585 memmove (rel, rel + count, \
2586 (relend - rel - count) * sizeof (*rel)); \
2588 input_section->reloc_count--; \
2595 for (i_ = 0; i_ < count; i_++) \
2597 rel[i_].r_info = 0; \
2598 rel[i_].r_addend = 0; \
2604 /* Will a symbol be bound to the definition within the shared
2605 library, if any. A unique symbol can never be bound locally. */
2606 #define SYMBOLIC_BIND(INFO, H) \
2607 (!(H)->unique_global \
2608 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2613 #endif /* _LIBELF_H_ */