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6ec3bb6a75
linking. (ELF_R_TYPE): Define. (bfd_add_to_strtab): Return unsigned long. Change check for realloc failure. (elf_fake_sections): Check return value of bfd_add_to_strtab. (elf_compute_section_file_positions): Add link_info argument. Call elf_backend_begin_write_processing hook and prep_headers here. Only call swap_out_syms if link_info is NULL. Set up .shstrtab section here. Pass dosyms argument to assign_file_positions_except_relocs. Set output_has_begun flag. (assign_file_positions_for_symtab_and_strtabs): Add dosyms argument, and use it to control setting .symtab and .strtab file positions. (assign_file_positions_except_relocs): Add dosyms argument, and pass it on. (prep_headers): Check return value of bfd_add_to_strtab. (swap_out_syms): Likewise. Also, don't set up .shstrtab here. (NAME(bfd_elf,write_object_contents)): Some calls moved into elf_compute_section_file_positions. (elf_set_section_contents): Likewise. (elf_slurp_symbol_table): SHN_LORESERV corrected to SHN_LORESERVE. * libelf.h: Include bfdlink.h. (struct elf_backend_data): Add fields collect, elf_add_symbol_hook, elf_backend_relocate_section. (struct bfd_elf_section_data): Add field rel_hashes. (struct elf_obj_tdata): Remove fields internal_syms and symbols. Add field sym_hashes. (obj_symbols, obj_internal_syms): Remove definitions. (elf_sym_hashes): Define. (struct elf_link_hash_entry): Define. (struct elf_link_hash_table): Define. (elf_link_hash_lookup): Define. (elf_link_hash_traverse): Define. (elf_hash_table): Define. (_bfd_elf_link_hash_table_create): Declare. (bfd_elf32_bfd_link_add_symbols): Declare. (bfd_elf32_bfd_final_link): Declare. (bfd_elf64_bfd_link_add_symbols): Declare. (bfd_elf64_bfd_final_link): Declare. * elf.c: Include bfdlink.h. (elf_link_hash_newfunc): New function. (_bfd_elf_link_hash_table_create): New function. * elf32-target.h (elf_backend_relocate_section): If not defined, define as 0 and use generic linker. Otherwise, use ELF backend linker. (elf_backend_collect): If not defined, define as false. (elf_backend_add_symbol_hook): If not defined, define as 0. (elf32_bed): Initialize new fields. * elf64-target.h: Same changes as elf32-target.h. * elf32-i386.c: Include bfdlink.h. (elf_i386_relocate_section): New function. (elf_backend_relocate_section): Define. * elf32-sparc.c: Include bfdlink.h. (elf_info_to_howto): Change type of dst from Elf32_Internal_Rela to Elf_Internal_Rela (they're the same type anyhow). (elf_sparc_relocate_section): New function. (elf_backend_relocate_section): Define. * elf32-mips.c (elf_backend_collect): Define.
446 lines
17 KiB
C
446 lines
17 KiB
C
/* BFD back-end data structures for ELF files.
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Copyright (C) 1992, 1993 Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef _LIBELF_H_
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#define _LIBELF_H_ 1
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#include "elf/common.h"
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#include "elf/internal.h"
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#include "elf/external.h"
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#include "bfdlink.h"
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/* If size isn't specified as 64 or 32, NAME macro should fail. */
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#ifndef NAME
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#if ARCH_SIZE==64
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#define NAME(x,y) CAT4(x,64,_,y)
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#endif
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#if ARCH_SIZE==32
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#define NAME(x,y) CAT4(x,32,_,y)
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#endif
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#endif
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#ifndef NAME
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#define NAME(x,y) CAT4(x,NOSIZE,_,y)
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#endif
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#define ElfNAME(X) NAME(Elf,X)
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#define elfNAME(X) NAME(elf,X)
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/* Information held for an ELF symbol. The first field is the
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corresponding asymbol. Every symbol is an ELF file is actually a
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pointer to this structure, although it is often handled as a
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pointer to an asymbol. */
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typedef struct
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{
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/* The BFD symbol. */
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asymbol symbol;
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/* ELF symbol information. */
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Elf_Internal_Sym internal_elf_sym;
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/* Backend specific information. */
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union
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{
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unsigned int hppa_arg_reloc;
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PTR mips_extr;
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PTR any;
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}
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tc_data;
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} elf_symbol_type;
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/* Constant information held for an ELF backend. */
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struct elf_backend_data
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{
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/* Whether the backend uses REL or RELA relocations. FIXME: some
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ELF backends use both. When we need to support one, this whole
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approach will need to be changed. */
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int use_rela_p;
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/* Whether this backend is 64 bits or not. FIXME: Who cares? */
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int elf_64_p;
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/* The architecture for this backend. */
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enum bfd_architecture arch;
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/* The ELF machine code (EM_xxxx) for this backend. */
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int elf_machine_code;
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/* The maximum page size for this backend. */
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bfd_vma maxpagesize;
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/* This is true if the linker should act like collect and gather
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global constructors and destructors by name. This is true for
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MIPS ELF because the Irix 5 tools can not handle the .init
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section. */
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boolean collect;
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/* A function to translate an ELF RELA relocation to a BFD arelent
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structure. */
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void (*elf_info_to_howto) PARAMS ((bfd *, arelent *,
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Elf_Internal_Rela *));
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/* A function to translate an ELF REL relocation to a BFD arelent
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structure. */
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void (*elf_info_to_howto_rel) PARAMS ((bfd *, arelent *,
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Elf_Internal_Rel *));
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/* A function to determine whether a symbol is global when
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partitioning the symbol table into local and global symbols.
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This should be NULL for most targets, in which case the correct
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thing will be done. MIPS ELF, at least on the Irix 5, has
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special requirements. */
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boolean (*elf_backend_sym_is_global) PARAMS ((bfd *, asymbol *));
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/* The remaining functions are hooks which are called only if they
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are not NULL. */
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/* A function to permit a backend specific check on whether a
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particular BFD format is relevant for an object file, and to
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permit the backend to set any global information it wishes. When
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this is called elf_elfheader is set, but anything else should be
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used with caution. If this returns false, the check_format
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routine will return a bfd_error_wrong_format error. */
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boolean (*elf_backend_object_p) PARAMS ((bfd *));
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/* A function to do additional symbol processing when reading the
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ELF symbol table. This is where any processor-specific special
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section indices are handled. */
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void (*elf_backend_symbol_processing) PARAMS ((bfd *, asymbol *));
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/* A function to do additional symbol processing after reading the
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entire ELF symbol table. */
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boolean (*elf_backend_symbol_table_processing) PARAMS ((bfd *,
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elf_symbol_type *,
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int));
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/* A function to do additional processing on the ELF section header
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just before writing it out. This is used to set the flags and
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type fields for some sections, or to actually write out data for
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unusual sections. */
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boolean (*elf_backend_section_processing) PARAMS ((bfd *,
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Elf32_Internal_Shdr *));
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/* A function to handle unusual section types when creating BFD
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sections from ELF sections. */
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boolean (*elf_backend_section_from_shdr) PARAMS ((bfd *,
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Elf32_Internal_Shdr *,
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char *));
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/* A function to set up the ELF section header for a BFD section in
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preparation for writing it out. This is where the flags and type
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fields are set for unusual sections. */
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boolean (*elf_backend_fake_sections) PARAMS ((bfd *, Elf32_Internal_Shdr *,
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asection *));
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/* A function to get the ELF section index for a BFD section. If
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this returns true, the section was found. If it is a normal ELF
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section, *RETVAL should be left unchanged. If it is not a normal
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ELF section *RETVAL should be set to the SHN_xxxx index. */
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boolean (*elf_backend_section_from_bfd_section)
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PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *, int *retval));
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/* If this field is not NULL, it is called by the add_symbols phase
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of a link just before adding a symbol to the global linker hash
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table. It may modify any of the fields as it wishes. If *NAME
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is set to NULL, the symbol will be skipped rather than being
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added to the hash table. This function is responsible for
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handling all processor dependent symbol bindings and section
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indices, and must set at least *FLAGS and *SEC for each processor
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dependent case; failure to do so will cause a link error. */
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boolean (*elf_add_symbol_hook)
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PARAMS ((bfd *abfd, struct bfd_link_info *info,
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const Elf_Internal_Sym *, const char **name,
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flagword *flags, asection **sec, bfd_vma *value));
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/* The RELOCATE_SECTION function is called by the ELF backend linker
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to handle the relocations for a section.
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The relocs are always passed as Rela structures; if the section
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actually uses Rel structures, the r_addend field will always be
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zero.
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This function is responsible for adjust the section contents as
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necessary, and (if using Rela relocs and generating a
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relocateable output file) adjusting the reloc addend as
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necessary.
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This function does not have to worry about setting the reloc
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address or the reloc symbol index.
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LOCAL_SYMS is a pointer to the swapped in local symbols.
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LOCAL_SECTIONS is an array giving the section in the input file
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corresponding to the st_shndx field of each local symbol.
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The global hash table entry for the global symbols can be found
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via elf_sym_hashes (input_bfd).
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When generating relocateable output, this function must handle
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STB_LOCAL/STT_SECTION symbols specially. The output symbol is
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going to be the section symbol corresponding to the output
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section, which means that the addend must be adjusted
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accordingly. */
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boolean (*elf_backend_relocate_section)
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PARAMS ((bfd *output_bfd, struct bfd_link_info *info,
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bfd *input_bfd, asection *input_section, bfd_byte *contents,
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Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms,
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asection **local_sections));
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/* A function to do any beginning processing needed for the ELF file
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before building the ELF headers and computing file positions. */
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void (*elf_backend_begin_write_processing) PARAMS ((bfd *));
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/* A function to do any final processing needed for the ELF file
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before writing it out. */
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void (*elf_backend_final_write_processing) PARAMS ((bfd *));
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/* The swapping table to use when dealing with ECOFF information.
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Used for the MIPS ELF .mdebug section. */
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const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
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};
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struct elf_sym_extra
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{
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int elf_sym_num; /* sym# after locals/globals are reordered */
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};
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typedef struct elf_sym_extra Elf_Sym_Extra;
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struct bfd_elf_section_data {
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Elf_Internal_Shdr this_hdr;
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Elf_Internal_Shdr rel_hdr;
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int this_idx, rel_idx;
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struct elf_link_hash_entry **rel_hashes;
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};
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#define elf_section_data(sec) ((struct bfd_elf_section_data*)sec->used_by_bfd)
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#define shdr_name(abfd,shdr) (elf_shstrtab (abfd)->tab + (shdr)->sh_name)
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#define get_elf_backend_data(abfd) \
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((struct elf_backend_data *) (abfd)->xvec->backend_data)
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struct strtab
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{
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char *tab;
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int nentries;
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int length;
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};
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/* Some private data is stashed away for future use using the tdata pointer
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in the bfd structure. */
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struct elf_obj_tdata
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{
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Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
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Elf_Internal_Shdr **elf_sect_ptr;
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Elf_Internal_Phdr *phdr;
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struct strtab *strtab_ptr;
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int num_locals;
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int num_globals;
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Elf_Sym_Extra *sym_extra;
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asymbol **section_syms; /* STT_SECTION symbols for each section */
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int num_section_syms; /* number of section_syms allocated */
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Elf_Internal_Shdr symtab_hdr;
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Elf_Internal_Shdr shstrtab_hdr;
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Elf_Internal_Shdr strtab_hdr;
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Elf_Internal_Shdr dynsymtab_hdr;
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Elf_Internal_Shdr dynstrtab_hdr;
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int symtab_section, shstrtab_section, strtab_section, dynsymtab_section;
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file_ptr next_file_pos;
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void *prstatus; /* The raw /proc prstatus structure */
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void *prpsinfo; /* The raw /proc prpsinfo structure */
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bfd_vma gp; /* The gp value (MIPS only, for now) */
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int gp_size; /* The gp size (MIPS only, for now) */
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/* A mapping from external symbols to entries in the linker hash
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table, used when linking. This is indexed by the symbol index
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minus the sh_info field of the symbol table header. */
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struct elf_link_hash_entry **sym_hashes;
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};
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#define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
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#define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
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#define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
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#define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
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#define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
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#define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
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#define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
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#define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
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#define elf_sym_extra(bfd) (elf_tdata(bfd) -> sym_extra)
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#define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
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#define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
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#define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
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#define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
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#define elf_gp(bfd) (elf_tdata(bfd) -> gp)
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#define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
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#define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
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/* ELF linker hash table entries. */
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struct elf_link_hash_entry
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{
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struct bfd_link_hash_entry root;
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/* Symbol index in output file. This is initialized to -1. It is
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set to -2 if the symbol is used by a reloc. */
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long indx;
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/* Symbol size. */
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bfd_size_type size;
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/* Symbol alignment (common symbols only). */
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unsigned short align;
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/* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
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char type;
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};
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/* ELF linker hash table. */
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struct elf_link_hash_table
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{
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struct bfd_link_hash_table root;
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};
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/* Look up an entry in an ELF linker hash table. */
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#define elf_link_hash_lookup(table, string, create, copy, follow) \
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((struct elf_link_hash_entry *) \
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bfd_link_hash_lookup (&(table)->root, (string), (create), \
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(copy), (follow)))
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/* Traverse an ELF linker hash table. */
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#define elf_link_hash_traverse(table, func, info) \
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(bfd_link_hash_traverse \
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(&(table)->root, \
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(boolean (*) PARAMS ((struct bfd_link_hash_entry *, PTR))) (func), \
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(info)))
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/* Get the ELF linker hash table from a link_info structure. */
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#define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
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extern char * elf_string_from_elf_section PARAMS ((bfd *, unsigned, unsigned));
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extern char * elf_get_str_section PARAMS ((bfd *, unsigned));
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#define bfd_elf32_mkobject bfd_elf_mkobject
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#define bfd_elf64_mkobject bfd_elf_mkobject
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#define elf_mkobject bfd_elf_mkobject
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extern unsigned long bfd_elf_hash PARAMS ((CONST unsigned char *));
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extern bfd_reloc_status_type bfd_elf_generic_reloc PARAMS ((bfd *,
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arelent *,
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asymbol *,
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PTR,
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asection *,
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bfd *,
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char **));
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extern boolean bfd_elf_mkobject PARAMS ((bfd *));
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extern Elf_Internal_Shdr *bfd_elf_find_section PARAMS ((bfd *, char *));
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extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
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PARAMS ((bfd *));
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extern boolean bfd_elf32_write_object_contents PARAMS ((bfd *));
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extern boolean bfd_elf64_write_object_contents PARAMS ((bfd *));
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extern bfd_target *bfd_elf32_object_p PARAMS ((bfd *));
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extern bfd_target *bfd_elf32_core_file_p PARAMS ((bfd *));
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extern char *bfd_elf32_core_file_failing_command PARAMS ((bfd *));
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extern int bfd_elf32_core_file_failing_signal PARAMS ((bfd *));
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extern boolean bfd_elf32_core_file_matches_executable_p PARAMS ((bfd *,
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bfd *));
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extern boolean bfd_elf32_set_section_contents PARAMS ((bfd *, sec_ptr, PTR,
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file_ptr,
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bfd_size_type));
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extern long bfd_elf32_get_symtab_upper_bound PARAMS ((bfd *));
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extern long bfd_elf32_get_symtab PARAMS ((bfd *, asymbol **));
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extern long bfd_elf32_get_dynamic_symtab_upper_bound PARAMS ((bfd *));
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extern long bfd_elf32_canonicalize_dynamic_symtab PARAMS ((bfd *, asymbol **));
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extern long bfd_elf32_get_reloc_upper_bound PARAMS ((bfd *, sec_ptr));
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extern long bfd_elf32_canonicalize_reloc PARAMS ((bfd *, sec_ptr,
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arelent **, asymbol **));
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extern asymbol *bfd_elf32_make_empty_symbol PARAMS ((bfd *));
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extern void bfd_elf32_print_symbol PARAMS ((bfd *, PTR, asymbol *,
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bfd_print_symbol_type));
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extern void bfd_elf32_get_symbol_info PARAMS ((bfd *, asymbol *,
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symbol_info *));
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extern alent *bfd_elf32_get_lineno PARAMS ((bfd *, asymbol *));
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extern boolean bfd_elf32_set_arch_mach PARAMS ((bfd *, enum bfd_architecture,
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unsigned long));
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extern boolean bfd_elf32_find_nearest_line PARAMS ((bfd *, asection *,
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asymbol **,
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bfd_vma, CONST char **,
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CONST char **,
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unsigned int *));
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extern int bfd_elf32_sizeof_headers PARAMS ((bfd *, boolean));
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extern void bfd_elf32__write_relocs PARAMS ((bfd *, asection *, PTR));
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extern boolean bfd_elf32_new_section_hook PARAMS ((bfd *, asection *));
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extern boolean bfd_elf32_bfd_link_add_symbols
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PARAMS ((bfd *, struct bfd_link_info *));
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extern boolean bfd_elf32_bfd_final_link
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PARAMS ((bfd *, struct bfd_link_info *));
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/* If the target doesn't have reloc handling written yet: */
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extern void bfd_elf32_no_info_to_howto PARAMS ((bfd *, arelent *,
|
||
Elf32_Internal_Rela *));
|
||
|
||
extern bfd_target *bfd_elf64_object_p PARAMS ((bfd *));
|
||
extern bfd_target *bfd_elf64_core_file_p PARAMS ((bfd *));
|
||
extern char *bfd_elf64_core_file_failing_command PARAMS ((bfd *));
|
||
extern int bfd_elf64_core_file_failing_signal PARAMS ((bfd *));
|
||
extern boolean bfd_elf64_core_file_matches_executable_p PARAMS ((bfd *,
|
||
bfd *));
|
||
extern boolean bfd_elf64_set_section_contents PARAMS ((bfd *, sec_ptr, PTR,
|
||
file_ptr,
|
||
bfd_size_type));
|
||
|
||
extern long bfd_elf64_get_symtab_upper_bound PARAMS ((bfd *));
|
||
extern long bfd_elf64_get_symtab PARAMS ((bfd *, asymbol **));
|
||
extern long bfd_elf64_get_dynamic_symtab_upper_bound PARAMS ((bfd *));
|
||
extern long bfd_elf64_canonicalize_dynamic_symtab PARAMS ((bfd *, asymbol **));
|
||
extern long bfd_elf64_get_reloc_upper_bound PARAMS ((bfd *, sec_ptr));
|
||
extern long bfd_elf64_canonicalize_reloc PARAMS ((bfd *, sec_ptr,
|
||
arelent **, asymbol **));
|
||
extern asymbol *bfd_elf64_make_empty_symbol PARAMS ((bfd *));
|
||
extern void bfd_elf64_print_symbol PARAMS ((bfd *, PTR, asymbol *,
|
||
bfd_print_symbol_type));
|
||
extern void bfd_elf64_get_symbol_info PARAMS ((bfd *, asymbol *,
|
||
symbol_info *));
|
||
extern alent *bfd_elf64_get_lineno PARAMS ((bfd *, asymbol *));
|
||
extern boolean bfd_elf64_set_arch_mach PARAMS ((bfd *, enum bfd_architecture,
|
||
unsigned long));
|
||
extern boolean bfd_elf64_find_nearest_line PARAMS ((bfd *, asection *,
|
||
asymbol **,
|
||
bfd_vma, CONST char **,
|
||
CONST char **,
|
||
unsigned int *));
|
||
extern int bfd_elf64_sizeof_headers PARAMS ((bfd *, boolean));
|
||
extern void bfd_elf64__write_relocs PARAMS ((bfd *, asection *, PTR));
|
||
extern boolean bfd_elf64_new_section_hook PARAMS ((bfd *, asection *));
|
||
extern boolean bfd_elf64_bfd_link_add_symbols
|
||
PARAMS ((bfd *, struct bfd_link_info *));
|
||
extern boolean bfd_elf64_bfd_final_link
|
||
PARAMS ((bfd *, struct bfd_link_info *));
|
||
|
||
/* If the target doesn't have reloc handling written yet: */
|
||
extern void bfd_elf64_no_info_to_howto PARAMS ((bfd *, arelent *,
|
||
Elf64_Internal_Rela *));
|
||
|
||
#endif /* _LIBELF_H_ */
|