external.h

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// SPDX-FileCopyrightText: 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2001, 2003, 2005 Free Software Foundation, Inc.
// SPDX-License-Identifier: GPL-2.0-or-later
 
/* ELF support for BFD.
   Copyright 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2001, 2003, 2005
   Free Software Foundation, Inc.
 
   Written by Fred Fish @ Cygnus Support, from information published
   in "UNIX System V Release 4, Programmers Guide: ANSI C and
   Programming Support Tools".
 
This file is part of BFD, the Binary File Descriptor library.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
 
/* This file is part of ELF support for BFD, and contains the portions
   that describe how ELF is represented externally by the BFD library.
   I.E. it describes the in-file representation of ELF.  It requires
   the elf/common.h file which contains the portions that are common to
   both the internal and external representations. */
 
/* The 64-bit stuff is kind of random.  Perhaps someone will publish a
   spec someday.  */
 
#ifndef _ELF_EXTERNAL_H
#define _ELF_EXTERNAL_H
 
/* ELF Header (32-bit implementations) */
 
typedef struct {
    unsigned char e_ident[16]; /* ELF "magic number" */
    unsigned char e_type[2]; /* Identifies object file type */
    unsigned char e_machine[2]; /* Specifies required architecture */
    unsigned char e_version[4]; /* Identifies object file version */
    unsigned char e_entry[4]; /* Entry point virtual address */
    unsigned char e_phoff[4]; /* Program header table file offset */
    unsigned char e_shoff[4]; /* Section header table file offset */
    unsigned char e_flags[4]; /* Processor-specific flags */
    unsigned char e_ehsize[2]; /* ELF header size in bytes */
    unsigned char e_phentsize[2]; /* Program header table entry size */
    unsigned char e_phnum[2]; /* Program header table entry count */
    unsigned char e_shentsize[2]; /* Section header table entry size */
    unsigned char e_shnum[2]; /* Section header table entry count */
    unsigned char e_shstrndx[2]; /* Section header string table index */
} Elf32_External_Ehdr;
 
typedef struct {
    unsigned char e_ident[16]; /* ELF "magic number" */
    unsigned char e_type[2]; /* Identifies object file type */
    unsigned char e_machine[2]; /* Specifies required architecture */
    unsigned char e_version[4]; /* Identifies object file version */
    unsigned char e_entry[8]; /* Entry point virtual address */
    unsigned char e_phoff[8]; /* Program header table file offset */
    unsigned char e_shoff[8]; /* Section header table file offset */
    unsigned char e_flags[4]; /* Processor-specific flags */
    unsigned char e_ehsize[2]; /* ELF header size in bytes */
    unsigned char e_phentsize[2]; /* Program header table entry size */
    unsigned char e_phnum[2]; /* Program header table entry count */
    unsigned char e_shentsize[2]; /* Section header table entry size */
    unsigned char e_shnum[2]; /* Section header table entry count */
    unsigned char e_shstrndx[2]; /* Section header string table index */
} Elf64_External_Ehdr;
 
/* Program header */
 
typedef struct {
    unsigned char p_type[4]; /* Identifies program segment type */
    unsigned char p_offset[4]; /* Segment file offset */
    unsigned char p_vaddr[4]; /* Segment virtual address */
    unsigned char p_paddr[4]; /* Segment physical address */
    unsigned char p_filesz[4]; /* Segment size in file */
    unsigned char p_memsz[4]; /* Segment size in memory */
    unsigned char p_flags[4]; /* Segment flags */
    unsigned char p_align[4]; /* Segment alignment, file & memory */
} Elf32_External_Phdr;
 
typedef struct {
    unsigned char p_type[4]; /* Identifies program segment type */
    unsigned char p_flags[4]; /* Segment flags */
    unsigned char p_offset[8]; /* Segment file offset */
    unsigned char p_vaddr[8]; /* Segment virtual address */
    unsigned char p_paddr[8]; /* Segment physical address */
    unsigned char p_filesz[8]; /* Segment size in file */
    unsigned char p_memsz[8]; /* Segment size in memory */
    unsigned char p_align[8]; /* Segment alignment, file & memory */
} Elf64_External_Phdr;
 
/* Section header */
 
typedef struct {
    unsigned char sh_name[4]; /* Section name, index in string tbl */
    unsigned char sh_type[4]; /* Type of section */
    unsigned char sh_flags[4]; /* Miscellaneous section attributes */
    unsigned char sh_addr[4]; /* Section virtual addr at execution */
    unsigned char sh_offset[4]; /* Section file offset */
    unsigned char sh_size[4]; /* Size of section in bytes */
    unsigned char sh_link[4]; /* Index of another section */
    unsigned char sh_info[4]; /* Additional section information */
    unsigned char sh_addralign[4]; /* Section alignment */
    unsigned char sh_entsize[4]; /* Entry size if section holds table */
} Elf32_External_Shdr;
 
typedef struct {
    unsigned char sh_name[4]; /* Section name, index in string tbl */
    unsigned char sh_type[4]; /* Type of section */
    unsigned char sh_flags[8]; /* Miscellaneous section attributes */
    unsigned char sh_addr[8]; /* Section virtual addr at execution */
    unsigned char sh_offset[8]; /* Section file offset */
    unsigned char sh_size[8]; /* Size of section in bytes */
    unsigned char sh_link[4]; /* Index of another section */
    unsigned char sh_info[4]; /* Additional section information */
    unsigned char sh_addralign[8]; /* Section alignment */
    unsigned char sh_entsize[8]; /* Entry size if section holds table */
} Elf64_External_Shdr;
 
/* Symbol table entry */
 
typedef struct {
    unsigned char st_name[4]; /* Symbol name, index in string tbl */
    unsigned char st_value[4]; /* Value of the symbol */
    unsigned char st_size[4]; /* Associated symbol size */
    unsigned char st_info[1]; /* Type and binding attributes */
    unsigned char st_other[1]; /* No defined meaning, 0 */
    unsigned char st_shndx[2]; /* Associated section index */
} Elf32_External_Sym;
 
typedef struct {
    unsigned char st_name[4]; /* Symbol name, index in string tbl */
    unsigned char st_info[1]; /* Type and binding attributes */
    unsigned char st_other[1]; /* No defined meaning, 0 */
    unsigned char st_shndx[2]; /* Associated section index */
    unsigned char st_value[8]; /* Value of the symbol */
    unsigned char st_size[8]; /* Associated symbol size */
} Elf64_External_Sym;
 
typedef struct {
    unsigned char est_shndx[4]; /* Section index */
} Elf_External_Sym_Shndx;
 
/* Note segments */
 
typedef struct {
    unsigned char namesz[4]; /* Size of entry's owner string */
    unsigned char descsz[4]; /* Size of the note descriptor */
    unsigned char type[4]; /* Interpretation of the descriptor */
    char name[1]; /* Start of the name+desc data */
} Elf_External_Note;
 
/* Relocation Entries */
typedef struct {
    unsigned char rz_offset[4]; /* Location at which to apply the action */
    unsigned char rz_info[4]; /* index and type of relocation */
} Elf32_External_Rel;
 
typedef struct {
    unsigned char rz_offset[4]; /* Location at which to apply the action */
    unsigned char rz_info[4]; /* index and type of relocation */
    unsigned char rz_addend[4]; /* Constant addend used to compute value */
} Elf32_External_Rela;
 
typedef struct {
    unsigned char rz_offset[8]; /* Location at which to apply the action */
    unsigned char rz_info[8]; /* index and type of relocation */
} Elf64_External_Rel;
 
typedef struct {
    unsigned char rz_offset[8]; /* Location at which to apply the action */
    unsigned char rz_info[8]; /* index and type of relocation */
    unsigned char rz_addend[8]; /* Constant addend used to compute value */
} Elf64_External_Rela;
 
/* dynamic section structure */
 
typedef struct {
    unsigned char d_tag[4]; /* entry tag value */
    union {
        unsigned char d_val[4];
        unsigned char d_ptr[4];
    } d_un;
} Elf32_External_Dyn;
 
typedef struct {
    unsigned char d_tag[8]; /* entry tag value */
    union {
        unsigned char d_val[8];
        unsigned char d_ptr[8];
    } d_un;
} Elf64_External_Dyn;
 
/* The version structures are currently size independent.  They are
   named without a 32 or 64.  If that ever changes, these structures
   will need to be renamed.  */
 
/* This structure appears in a SHT_GNU_verdef section.  */
 
typedef struct {
    unsigned char vd_version[2];
    unsigned char vd_flags[2];
    unsigned char vd_ndx[2];
    unsigned char vd_cnt[2];
    unsigned char vd_hash[4];
    unsigned char vd_aux[4];
    unsigned char vd_next[4];
} Elf_External_Verdef;
 
/* This structure appears in a SHT_GNU_verdef section.  */
 
typedef struct {
    unsigned char vda_name[4];
    unsigned char vda_next[4];
} Elf_External_Verdaux;
 
/* This structure appears in a SHT_GNU_verneed section.  */
 
typedef struct {
    unsigned char vn_version[2];
    unsigned char vn_cnt[2];
    unsigned char vn_file[4];
    unsigned char vn_aux[4];
    unsigned char vn_next[4];
} Elf_External_Verneed;
 
/* This structure appears in a SHT_GNU_verneed section.  */
 
typedef struct {
    unsigned char vna_hash[4];
    unsigned char vna_flags[2];
    unsigned char vna_other[2];
    unsigned char vna_name[4];
    unsigned char vna_next[4];
} Elf_External_Vernaux;
 
/* This structure appears in a SHT_GNU_versym section.  This is not a
   standard ELF structure; ELF just uses Elf32_Half.  */
 
typedef struct {
    unsigned char vs_vers[2];
} ATTRIBUTE_PACKED Elf_External_Versym;
 
/* Structure for syminfo section.  */
typedef struct
{
    unsigned char si_boundto[2];
    unsigned char si_flags[2];
} Elf_External_Syminfo;
 
/* This structure appears on the stack and in NT_AUXV core file notes.  */
typedef struct
{
    unsigned char a_type[4];
    unsigned char a_val[4];
} Elf32_External_Auxv;
 
typedef struct
{
    unsigned char a_type[8];
    unsigned char a_val[8];
} Elf64_External_Auxv;
 
/* Size of SHT_GROUP section entry.  */
 
#define GRP_ENTRY_SIZE 4
 
#endif /* _ELF_EXTERNAL_H */