1 /* ELF support for BFD. 2 Copyright (C) 1991-2014 Free Software Foundation, Inc. 3 4 Written by Fred Fish @ Cygnus Support, from information published 5 in "UNIX System V Release 4, Programmers Guide: ANSI C and 6 Programming Support Tools". 7 8 This file is part of BFD, the Binary File Descriptor library. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program; if not, write to the Free Software 22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 23 MA 02110-1301, USA. */ 24 25 /* This file is part of ELF support for BFD, and contains the portions 26 that describe how ELF is represented externally by the BFD library. 27 I.E. it describes the in-file representation of ELF. It requires 28 the elf/common.h file which contains the portions that are common to 29 both the internal and external representations. */ 30 31 /* The 64-bit stuff is kind of random. Perhaps someone will publish a 32 spec someday. */ 33 34 #ifndef _ELF_EXTERNAL_H 35 #define _ELF_EXTERNAL_H 36 37 /* Special section indices, which may show up in st_shndx fields, among 38 other places. */ 39 40 #define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */ 41 #define SHN_LOPROC 0xFF00 /* Begin range of appl-specific */ 42 #define SHN_HIPROC 0xFF1F /* End range of appl-specific */ 43 #define SHN_LOOS 0xFF20 /* OS specific semantics, lo */ 44 #define SHN_HIOS 0xFF3F /* OS specific semantics, hi */ 45 #define SHN_ABS 0xFFF1 /* Associated symbol is absolute */ 46 #define SHN_COMMON 0xFFF2 /* Associated symbol is in common */ 47 #define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */ 48 #define SHN_HIRESERVE 0xFFFF /* End range of reserved indices */ 49 50 /* ELF Header (32-bit implementations) */ 51 52 typedef struct { 53 unsigned char e_ident[16]; /* ELF "magic number" */ 54 unsigned char e_type[2]; /* Identifies object file type */ 55 unsigned char e_machine[2]; /* Specifies required architecture */ 56 unsigned char e_version[4]; /* Identifies object file version */ 57 unsigned char e_entry[4]; /* Entry point virtual address */ 58 unsigned char e_phoff[4]; /* Program header table file offset */ 59 unsigned char e_shoff[4]; /* Section header table file offset */ 60 unsigned char e_flags[4]; /* Processor-specific flags */ 61 unsigned char e_ehsize[2]; /* ELF header size in bytes */ 62 unsigned char e_phentsize[2]; /* Program header table entry size */ 63 unsigned char e_phnum[2]; /* Program header table entry count */ 64 unsigned char e_shentsize[2]; /* Section header table entry size */ 65 unsigned char e_shnum[2]; /* Section header table entry count */ 66 unsigned char e_shstrndx[2]; /* Section header string table index */ 67 } Elf32_External_Ehdr; 68 69 typedef struct { 70 unsigned char e_ident[16]; /* ELF "magic number" */ 71 unsigned char e_type[2]; /* Identifies object file type */ 72 unsigned char e_machine[2]; /* Specifies required architecture */ 73 unsigned char e_version[4]; /* Identifies object file version */ 74 unsigned char e_entry[8]; /* Entry point virtual address */ 75 unsigned char e_phoff[8]; /* Program header table file offset */ 76 unsigned char e_shoff[8]; /* Section header table file offset */ 77 unsigned char e_flags[4]; /* Processor-specific flags */ 78 unsigned char e_ehsize[2]; /* ELF header size in bytes */ 79 unsigned char e_phentsize[2]; /* Program header table entry size */ 80 unsigned char e_phnum[2]; /* Program header table entry count */ 81 unsigned char e_shentsize[2]; /* Section header table entry size */ 82 unsigned char e_shnum[2]; /* Section header table entry count */ 83 unsigned char e_shstrndx[2]; /* Section header string table index */ 84 } Elf64_External_Ehdr; 85 86 /* Program header */ 87 88 typedef struct { 89 unsigned char p_type[4]; /* Identifies program segment type */ 90 unsigned char p_offset[4]; /* Segment file offset */ 91 unsigned char p_vaddr[4]; /* Segment virtual address */ 92 unsigned char p_paddr[4]; /* Segment physical address */ 93 unsigned char p_filesz[4]; /* Segment size in file */ 94 unsigned char p_memsz[4]; /* Segment size in memory */ 95 unsigned char p_flags[4]; /* Segment flags */ 96 unsigned char p_align[4]; /* Segment alignment, file & memory */ 97 } Elf32_External_Phdr; 98 99 typedef struct { 100 unsigned char p_type[4]; /* Identifies program segment type */ 101 unsigned char p_flags[4]; /* Segment flags */ 102 unsigned char p_offset[8]; /* Segment file offset */ 103 unsigned char p_vaddr[8]; /* Segment virtual address */ 104 unsigned char p_paddr[8]; /* Segment physical address */ 105 unsigned char p_filesz[8]; /* Segment size in file */ 106 unsigned char p_memsz[8]; /* Segment size in memory */ 107 unsigned char p_align[8]; /* Segment alignment, file & memory */ 108 } Elf64_External_Phdr; 109 110 /* Section header */ 111 112 typedef struct { 113 unsigned char sh_name[4]; /* Section name, index in string tbl */ 114 unsigned char sh_type[4]; /* Type of section */ 115 unsigned char sh_flags[4]; /* Miscellaneous section attributes */ 116 unsigned char sh_addr[4]; /* Section virtual addr at execution */ 117 unsigned char sh_offset[4]; /* Section file offset */ 118 unsigned char sh_size[4]; /* Size of section in bytes */ 119 unsigned char sh_link[4]; /* Index of another section */ 120 unsigned char sh_info[4]; /* Additional section information */ 121 unsigned char sh_addralign[4]; /* Section alignment */ 122 unsigned char sh_entsize[4]; /* Entry size if section holds table */ 123 } Elf32_External_Shdr; 124 125 typedef struct { 126 unsigned char sh_name[4]; /* Section name, index in string tbl */ 127 unsigned char sh_type[4]; /* Type of section */ 128 unsigned char sh_flags[8]; /* Miscellaneous section attributes */ 129 unsigned char sh_addr[8]; /* Section virtual addr at execution */ 130 unsigned char sh_offset[8]; /* Section file offset */ 131 unsigned char sh_size[8]; /* Size of section in bytes */ 132 unsigned char sh_link[4]; /* Index of another section */ 133 unsigned char sh_info[4]; /* Additional section information */ 134 unsigned char sh_addralign[8]; /* Section alignment */ 135 unsigned char sh_entsize[8]; /* Entry size if section holds table */ 136 } Elf64_External_Shdr; 137 138 /* Symbol table entry */ 139 140 typedef struct { 141 unsigned char st_name[4]; /* Symbol name, index in string tbl */ 142 unsigned char st_value[4]; /* Value of the symbol */ 143 unsigned char st_size[4]; /* Associated symbol size */ 144 unsigned char st_info[1]; /* Type and binding attributes */ 145 unsigned char st_other[1]; /* No defined meaning, 0 */ 146 unsigned char st_shndx[2]; /* Associated section index */ 147 } Elf32_External_Sym; 148 149 typedef struct { 150 unsigned char st_name[4]; /* Symbol name, index in string tbl */ 151 unsigned char st_info[1]; /* Type and binding attributes */ 152 unsigned char st_other[1]; /* No defined meaning, 0 */ 153 unsigned char st_shndx[2]; /* Associated section index */ 154 unsigned char st_value[8]; /* Value of the symbol */ 155 unsigned char st_size[8]; /* Associated symbol size */ 156 } Elf64_External_Sym; 157 158 typedef struct { 159 unsigned char est_shndx[4]; /* Section index */ 160 } Elf_External_Sym_Shndx; 161 162 /* Note segments */ 163 164 typedef struct { 165 unsigned char namesz[4]; /* Size of entry's owner string */ 166 unsigned char descsz[4]; /* Size of the note descriptor */ 167 unsigned char type[4]; /* Interpretation of the descriptor */ 168 char name[1]; /* Start of the name+desc data */ 169 } Elf_External_Note; 170 171 /* Relocation Entries */ 172 typedef struct { 173 unsigned char r_offset[4]; /* Location at which to apply the action */ 174 unsigned char r_info[4]; /* index and type of relocation */ 175 } Elf32_External_Rel; 176 177 typedef struct { 178 unsigned char r_offset[4]; /* Location at which to apply the action */ 179 unsigned char r_info[4]; /* index and type of relocation */ 180 unsigned char r_addend[4]; /* Constant addend used to compute value */ 181 } Elf32_External_Rela; 182 183 typedef struct { 184 unsigned char r_offset[8]; /* Location at which to apply the action */ 185 unsigned char r_info[8]; /* index and type of relocation */ 186 } Elf64_External_Rel; 187 188 typedef struct { 189 unsigned char r_offset[8]; /* Location at which to apply the action */ 190 unsigned char r_info[8]; /* index and type of relocation */ 191 unsigned char r_addend[8]; /* Constant addend used to compute value */ 192 } Elf64_External_Rela; 193 194 /* dynamic section structure */ 195 196 typedef struct { 197 unsigned char d_tag[4]; /* entry tag value */ 198 union { 199 unsigned char d_val[4]; 200 unsigned char d_ptr[4]; 201 } d_un; 202 } Elf32_External_Dyn; 203 204 typedef struct { 205 unsigned char d_tag[8]; /* entry tag value */ 206 union { 207 unsigned char d_val[8]; 208 unsigned char d_ptr[8]; 209 } d_un; 210 } Elf64_External_Dyn; 211 212 /* The version structures are currently size independent. They are 213 named without a 32 or 64. If that ever changes, these structures 214 will need to be renamed. */ 215 216 /* This structure appears in a SHT_GNU_verdef section. */ 217 218 typedef struct { 219 unsigned char vd_version[2]; 220 unsigned char vd_flags[2]; 221 unsigned char vd_ndx[2]; 222 unsigned char vd_cnt[2]; 223 unsigned char vd_hash[4]; 224 unsigned char vd_aux[4]; 225 unsigned char vd_next[4]; 226 } Elf_External_Verdef; 227 228 /* This structure appears in a SHT_GNU_verdef section. */ 229 230 typedef struct { 231 unsigned char vda_name[4]; 232 unsigned char vda_next[4]; 233 } Elf_External_Verdaux; 234 235 /* This structure appears in a SHT_GNU_verneed section. */ 236 237 typedef struct { 238 unsigned char vn_version[2]; 239 unsigned char vn_cnt[2]; 240 unsigned char vn_file[4]; 241 unsigned char vn_aux[4]; 242 unsigned char vn_next[4]; 243 } Elf_External_Verneed; 244 245 /* This structure appears in a SHT_GNU_verneed section. */ 246 247 typedef struct { 248 unsigned char vna_hash[4]; 249 unsigned char vna_flags[2]; 250 unsigned char vna_other[2]; 251 unsigned char vna_name[4]; 252 unsigned char vna_next[4]; 253 } Elf_External_Vernaux; 254 255 /* This structure appears in a SHT_GNU_versym section. This is not a 256 standard ELF structure; ELF just uses Elf32_Half. */ 257 258 typedef struct { 259 unsigned char vs_vers[2]; 260 } ATTRIBUTE_PACKED Elf_External_Versym; 261 262 /* Structure for syminfo section. */ 263 typedef struct 264 { 265 unsigned char si_boundto[2]; 266 unsigned char si_flags[2]; 267 } Elf_External_Syminfo; 268 269 270 /* This structure appears on the stack and in NT_AUXV core file notes. */ 271 typedef struct 272 { 273 unsigned char a_type[4]; 274 unsigned char a_val[4]; 275 } Elf32_External_Auxv; 276 277 typedef struct 278 { 279 unsigned char a_type[8]; 280 unsigned char a_val[8]; 281 } Elf64_External_Auxv; 282 283 /* Size of SHT_GROUP section entry. */ 284 285 #define GRP_ENTRY_SIZE 4 286 287 #endif /* _ELF_EXTERNAL_H */ 288