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| 5191 | serge | 1 | /* ELF support for BFD. |
| 6324 | serge | 2 | Copyright (C) 1991-2015 Free Software Foundation, Inc. |
| 5191 | serge | 3 | |
| 4 | Written by Fred Fish @ Cygnus Support, from information published |
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| 5 | in "UNIX System V Release 4, Programmers Guide: ANSI C and |
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| 6 | Programming Support Tools". |
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| 7 | |||
| 8 | This file is part of BFD, the Binary File Descriptor library. |
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| 9 | |||
| 10 | This program is free software; you can redistribute it and/or modify |
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| 11 | it under the terms of the GNU General Public License as published by |
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| 12 | the Free Software Foundation; either version 3 of the License, or |
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| 13 | (at your option) any later version. |
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| 14 | |||
| 15 | This program is distributed in the hope that it will be useful, |
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | GNU General Public License for more details. |
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| 19 | |||
| 20 | You should have received a copy of the GNU General Public License |
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| 21 | along with this program; if not, write to the Free Software |
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| 22 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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| 23 | MA 02110-1301, USA. */ |
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| 24 | |||
| 25 | /* This file is part of ELF support for BFD, and contains the portions |
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| 26 | that describe how ELF is represented externally by the BFD library. |
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| 27 | I.E. it describes the in-file representation of ELF. It requires |
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| 28 | the elf/common.h file which contains the portions that are common to |
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| 29 | both the internal and external representations. */ |
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| 30 | |||
| 31 | /* The 64-bit stuff is kind of random. Perhaps someone will publish a |
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| 32 | spec someday. */ |
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| 33 | |||
| 34 | #ifndef _ELF_EXTERNAL_H |
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| 35 | #define _ELF_EXTERNAL_H |
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| 36 | |||
| 37 | /* Special section indices, which may show up in st_shndx fields, among |
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| 38 | other places. */ |
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| 39 | |||
| 40 | #define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */ |
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| 41 | #define SHN_LOPROC 0xFF00 /* Begin range of appl-specific */ |
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| 42 | #define SHN_HIPROC 0xFF1F /* End range of appl-specific */ |
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| 43 | #define SHN_LOOS 0xFF20 /* OS specific semantics, lo */ |
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| 44 | #define SHN_HIOS 0xFF3F /* OS specific semantics, hi */ |
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| 45 | #define SHN_ABS 0xFFF1 /* Associated symbol is absolute */ |
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| 46 | #define SHN_COMMON 0xFFF2 /* Associated symbol is in common */ |
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| 47 | #define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */ |
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| 48 | #define SHN_HIRESERVE 0xFFFF /* End range of reserved indices */ |
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| 49 | |||
| 50 | /* ELF Header (32-bit implementations) */ |
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| 51 | |||
| 52 | typedef struct { |
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| 53 | unsigned char e_ident[16]; /* ELF "magic number" */ |
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| 54 | unsigned char e_type[2]; /* Identifies object file type */ |
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| 55 | unsigned char e_machine[2]; /* Specifies required architecture */ |
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| 56 | unsigned char e_version[4]; /* Identifies object file version */ |
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| 57 | unsigned char e_entry[4]; /* Entry point virtual address */ |
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| 58 | unsigned char e_phoff[4]; /* Program header table file offset */ |
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| 59 | unsigned char e_shoff[4]; /* Section header table file offset */ |
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| 60 | unsigned char e_flags[4]; /* Processor-specific flags */ |
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| 61 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ |
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| 62 | unsigned char e_phentsize[2]; /* Program header table entry size */ |
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| 63 | unsigned char e_phnum[2]; /* Program header table entry count */ |
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| 64 | unsigned char e_shentsize[2]; /* Section header table entry size */ |
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| 65 | unsigned char e_shnum[2]; /* Section header table entry count */ |
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| 66 | unsigned char e_shstrndx[2]; /* Section header string table index */ |
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| 67 | } Elf32_External_Ehdr; |
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| 68 | |||
| 69 | typedef struct { |
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| 70 | unsigned char e_ident[16]; /* ELF "magic number" */ |
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| 71 | unsigned char e_type[2]; /* Identifies object file type */ |
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| 72 | unsigned char e_machine[2]; /* Specifies required architecture */ |
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| 73 | unsigned char e_version[4]; /* Identifies object file version */ |
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| 74 | unsigned char e_entry[8]; /* Entry point virtual address */ |
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| 75 | unsigned char e_phoff[8]; /* Program header table file offset */ |
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| 76 | unsigned char e_shoff[8]; /* Section header table file offset */ |
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| 77 | unsigned char e_flags[4]; /* Processor-specific flags */ |
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| 78 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ |
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| 79 | unsigned char e_phentsize[2]; /* Program header table entry size */ |
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| 80 | unsigned char e_phnum[2]; /* Program header table entry count */ |
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| 81 | unsigned char e_shentsize[2]; /* Section header table entry size */ |
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| 82 | unsigned char e_shnum[2]; /* Section header table entry count */ |
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| 83 | unsigned char e_shstrndx[2]; /* Section header string table index */ |
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| 84 | } Elf64_External_Ehdr; |
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| 85 | |||
| 86 | /* Program header */ |
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| 87 | |||
| 88 | typedef struct { |
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| 89 | unsigned char p_type[4]; /* Identifies program segment type */ |
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| 90 | unsigned char p_offset[4]; /* Segment file offset */ |
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| 91 | unsigned char p_vaddr[4]; /* Segment virtual address */ |
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| 92 | unsigned char p_paddr[4]; /* Segment physical address */ |
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| 93 | unsigned char p_filesz[4]; /* Segment size in file */ |
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| 94 | unsigned char p_memsz[4]; /* Segment size in memory */ |
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| 95 | unsigned char p_flags[4]; /* Segment flags */ |
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| 96 | unsigned char p_align[4]; /* Segment alignment, file & memory */ |
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| 97 | } Elf32_External_Phdr; |
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| 98 | |||
| 99 | typedef struct { |
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| 100 | unsigned char p_type[4]; /* Identifies program segment type */ |
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| 101 | unsigned char p_flags[4]; /* Segment flags */ |
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| 102 | unsigned char p_offset[8]; /* Segment file offset */ |
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| 103 | unsigned char p_vaddr[8]; /* Segment virtual address */ |
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| 104 | unsigned char p_paddr[8]; /* Segment physical address */ |
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| 105 | unsigned char p_filesz[8]; /* Segment size in file */ |
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| 106 | unsigned char p_memsz[8]; /* Segment size in memory */ |
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| 107 | unsigned char p_align[8]; /* Segment alignment, file & memory */ |
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| 108 | } Elf64_External_Phdr; |
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| 109 | |||
| 110 | /* Section header */ |
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| 111 | |||
| 112 | typedef struct { |
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| 113 | unsigned char sh_name[4]; /* Section name, index in string tbl */ |
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| 114 | unsigned char sh_type[4]; /* Type of section */ |
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| 115 | unsigned char sh_flags[4]; /* Miscellaneous section attributes */ |
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| 116 | unsigned char sh_addr[4]; /* Section virtual addr at execution */ |
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| 117 | unsigned char sh_offset[4]; /* Section file offset */ |
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| 118 | unsigned char sh_size[4]; /* Size of section in bytes */ |
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| 119 | unsigned char sh_link[4]; /* Index of another section */ |
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| 120 | unsigned char sh_info[4]; /* Additional section information */ |
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| 121 | unsigned char sh_addralign[4]; /* Section alignment */ |
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| 122 | unsigned char sh_entsize[4]; /* Entry size if section holds table */ |
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| 123 | } Elf32_External_Shdr; |
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| 124 | |||
| 125 | typedef struct { |
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| 126 | unsigned char sh_name[4]; /* Section name, index in string tbl */ |
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| 127 | unsigned char sh_type[4]; /* Type of section */ |
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| 128 | unsigned char sh_flags[8]; /* Miscellaneous section attributes */ |
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| 129 | unsigned char sh_addr[8]; /* Section virtual addr at execution */ |
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| 130 | unsigned char sh_offset[8]; /* Section file offset */ |
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| 131 | unsigned char sh_size[8]; /* Size of section in bytes */ |
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| 132 | unsigned char sh_link[4]; /* Index of another section */ |
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| 133 | unsigned char sh_info[4]; /* Additional section information */ |
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| 134 | unsigned char sh_addralign[8]; /* Section alignment */ |
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| 135 | unsigned char sh_entsize[8]; /* Entry size if section holds table */ |
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| 136 | } Elf64_External_Shdr; |
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| 137 | |||
| 6324 | serge | 138 | /* Compression header */ |
| 139 | |||
| 140 | typedef struct { |
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| 141 | unsigned char ch_type[4]; /* Type of compression */ |
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| 142 | unsigned char ch_size[4]; /* Size of uncompressed data in bytes */ |
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| 143 | unsigned char ch_addralign[4]; /* Alignment of uncompressed data */ |
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| 144 | } Elf32_External_Chdr; |
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| 145 | |||
| 146 | typedef struct { |
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| 147 | unsigned char ch_type[4]; /* Type of compression */ |
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| 148 | unsigned char ch_reserved[4]; /* Padding */ |
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| 149 | unsigned char ch_size[8]; /* Size of uncompressed data in bytes */ |
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| 150 | unsigned char ch_addralign[8]; /* Alignment of uncompressed data */ |
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| 151 | } Elf64_External_Chdr; |
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| 152 | |||
| 5191 | serge | 153 | /* Symbol table entry */ |
| 154 | |||
| 155 | typedef struct { |
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| 156 | unsigned char st_name[4]; /* Symbol name, index in string tbl */ |
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| 157 | unsigned char st_value[4]; /* Value of the symbol */ |
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| 158 | unsigned char st_size[4]; /* Associated symbol size */ |
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| 159 | unsigned char st_info[1]; /* Type and binding attributes */ |
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| 160 | unsigned char st_other[1]; /* No defined meaning, 0 */ |
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| 161 | unsigned char st_shndx[2]; /* Associated section index */ |
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| 162 | } Elf32_External_Sym; |
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| 163 | |||
| 164 | typedef struct { |
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| 165 | unsigned char st_name[4]; /* Symbol name, index in string tbl */ |
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| 166 | unsigned char st_info[1]; /* Type and binding attributes */ |
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| 167 | unsigned char st_other[1]; /* No defined meaning, 0 */ |
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| 168 | unsigned char st_shndx[2]; /* Associated section index */ |
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| 169 | unsigned char st_value[8]; /* Value of the symbol */ |
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| 170 | unsigned char st_size[8]; /* Associated symbol size */ |
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| 171 | } Elf64_External_Sym; |
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| 172 | |||
| 173 | typedef struct { |
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| 174 | unsigned char est_shndx[4]; /* Section index */ |
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| 175 | } Elf_External_Sym_Shndx; |
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| 176 | |||
| 177 | /* Note segments */ |
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| 178 | |||
| 179 | typedef struct { |
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| 180 | unsigned char namesz[4]; /* Size of entry's owner string */ |
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| 181 | unsigned char descsz[4]; /* Size of the note descriptor */ |
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| 182 | unsigned char type[4]; /* Interpretation of the descriptor */ |
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| 183 | char name[1]; /* Start of the name+desc data */ |
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| 184 | } Elf_External_Note; |
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| 185 | |||
| 186 | /* Relocation Entries */ |
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| 187 | typedef struct { |
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| 188 | unsigned char r_offset[4]; /* Location at which to apply the action */ |
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| 189 | unsigned char r_info[4]; /* index and type of relocation */ |
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| 190 | } Elf32_External_Rel; |
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| 191 | |||
| 192 | typedef struct { |
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| 193 | unsigned char r_offset[4]; /* Location at which to apply the action */ |
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| 194 | unsigned char r_info[4]; /* index and type of relocation */ |
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| 195 | unsigned char r_addend[4]; /* Constant addend used to compute value */ |
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| 196 | } Elf32_External_Rela; |
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| 197 | |||
| 198 | typedef struct { |
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| 199 | unsigned char r_offset[8]; /* Location at which to apply the action */ |
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| 200 | unsigned char r_info[8]; /* index and type of relocation */ |
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| 201 | } Elf64_External_Rel; |
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| 202 | |||
| 203 | typedef struct { |
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| 204 | unsigned char r_offset[8]; /* Location at which to apply the action */ |
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| 205 | unsigned char r_info[8]; /* index and type of relocation */ |
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| 206 | unsigned char r_addend[8]; /* Constant addend used to compute value */ |
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| 207 | } Elf64_External_Rela; |
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| 208 | |||
| 209 | /* dynamic section structure */ |
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| 210 | |||
| 211 | typedef struct { |
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| 212 | unsigned char d_tag[4]; /* entry tag value */ |
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| 213 | union { |
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| 214 | unsigned char d_val[4]; |
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| 215 | unsigned char d_ptr[4]; |
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| 216 | } d_un; |
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| 217 | } Elf32_External_Dyn; |
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| 218 | |||
| 219 | typedef struct { |
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| 220 | unsigned char d_tag[8]; /* entry tag value */ |
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| 221 | union { |
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| 222 | unsigned char d_val[8]; |
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| 223 | unsigned char d_ptr[8]; |
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| 224 | } d_un; |
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| 225 | } Elf64_External_Dyn; |
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| 226 | |||
| 227 | /* The version structures are currently size independent. They are |
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| 228 | named without a 32 or 64. If that ever changes, these structures |
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| 229 | will need to be renamed. */ |
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| 230 | |||
| 231 | /* This structure appears in a SHT_GNU_verdef section. */ |
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| 232 | |||
| 233 | typedef struct { |
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| 234 | unsigned char vd_version[2]; |
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| 235 | unsigned char vd_flags[2]; |
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| 236 | unsigned char vd_ndx[2]; |
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| 237 | unsigned char vd_cnt[2]; |
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| 238 | unsigned char vd_hash[4]; |
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| 239 | unsigned char vd_aux[4]; |
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| 240 | unsigned char vd_next[4]; |
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| 241 | } Elf_External_Verdef; |
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| 242 | |||
| 243 | /* This structure appears in a SHT_GNU_verdef section. */ |
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| 244 | |||
| 245 | typedef struct { |
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| 246 | unsigned char vda_name[4]; |
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| 247 | unsigned char vda_next[4]; |
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| 248 | } Elf_External_Verdaux; |
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| 249 | |||
| 250 | /* This structure appears in a SHT_GNU_verneed section. */ |
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| 251 | |||
| 252 | typedef struct { |
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| 253 | unsigned char vn_version[2]; |
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| 254 | unsigned char vn_cnt[2]; |
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| 255 | unsigned char vn_file[4]; |
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| 256 | unsigned char vn_aux[4]; |
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| 257 | unsigned char vn_next[4]; |
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| 258 | } Elf_External_Verneed; |
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| 259 | |||
| 260 | /* This structure appears in a SHT_GNU_verneed section. */ |
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| 261 | |||
| 262 | typedef struct { |
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| 263 | unsigned char vna_hash[4]; |
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| 264 | unsigned char vna_flags[2]; |
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| 265 | unsigned char vna_other[2]; |
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| 266 | unsigned char vna_name[4]; |
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| 267 | unsigned char vna_next[4]; |
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| 268 | } Elf_External_Vernaux; |
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| 269 | |||
| 270 | /* This structure appears in a SHT_GNU_versym section. This is not a |
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| 271 | standard ELF structure; ELF just uses Elf32_Half. */ |
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| 272 | |||
| 273 | typedef struct { |
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| 274 | unsigned char vs_vers[2]; |
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| 275 | } ATTRIBUTE_PACKED Elf_External_Versym; |
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| 276 | |||
| 277 | /* Structure for syminfo section. */ |
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| 278 | typedef struct |
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| 279 | { |
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| 280 | unsigned char si_boundto[2]; |
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| 281 | unsigned char si_flags[2]; |
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| 282 | } Elf_External_Syminfo; |
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| 283 | |||
| 284 | |||
| 285 | /* This structure appears on the stack and in NT_AUXV core file notes. */ |
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| 286 | typedef struct |
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| 287 | { |
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| 288 | unsigned char a_type[4]; |
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| 289 | unsigned char a_val[4]; |
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| 290 | } Elf32_External_Auxv; |
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| 291 | |||
| 292 | typedef struct |
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| 293 | { |
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| 294 | unsigned char a_type[8]; |
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| 295 | unsigned char a_val[8]; |
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| 296 | } Elf64_External_Auxv; |
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| 297 | |||
| 298 | /* Size of SHT_GROUP section entry. */ |
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| 299 | |||
| 300 | #define GRP_ENTRY_SIZE 4 |
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| 301 | |||
| 302 | #endif /* _ELF_EXTERNAL_H */ |