1 /* This file defines generic ELF types, structures, and macros. 2 Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2015 Red Hat, Inc. 3 This file is part of elfutils. 4 5 This file is free software; you can redistribute it and/or modify 6 it under the terms of either 7 8 * the GNU Lesser General Public License as published by the Free 9 Software Foundation; either version 3 of the License, or (at 10 your option) any later version 11 12 or 13 14 * the GNU General Public License as published by the Free 15 Software Foundation; either version 2 of the License, or (at 16 your option) any later version 17 18 or both in parallel, as here. 19 20 elfutils is distributed in the hope that it will be useful, but 21 WITHOUT ANY WARRANTY; without even the implied warranty of 22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 23 General Public License for more details. 24 25 You should have received copies of the GNU General Public License and 26 the GNU Lesser General Public License along with this program. If 27 not, see <http://www.gnu.org/licenses/>. */ 28 29 #ifndef _GELF_H 30 #define _GELF_H 1 31 32 #include <libelf.h> 33 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 /* Class independent type definitions. Correctly speaking this is not 40 true. We assume that 64-bit binaries are the largest class and 41 therefore all other classes can be represented without loss. */ 42 43 /* Type for a 16-bit quantity. */ 44 typedef Elf64_Half GElf_Half; 45 46 /* Types for signed and unsigned 32-bit quantities. */ 47 typedef Elf64_Word GElf_Word; 48 typedef Elf64_Sword GElf_Sword; 49 50 /* Types for signed and unsigned 64-bit quantities. */ 51 typedef Elf64_Xword GElf_Xword; 52 typedef Elf64_Sxword GElf_Sxword; 53 54 /* Type of addresses. */ 55 typedef Elf64_Addr GElf_Addr; 56 57 /* Type of file offsets. */ 58 typedef Elf64_Off GElf_Off; 59 60 61 /* The ELF file header. This appears at the start of every ELF file. */ 62 typedef Elf64_Ehdr GElf_Ehdr; 63 64 /* Section header. */ 65 typedef Elf64_Shdr GElf_Shdr; 66 67 /* Section index. */ 68 /* XXX This should probably be a larger type in preparation of times when 69 regular section indices can be larger. */ 70 typedef Elf64_Section GElf_Section; 71 72 /* Symbol table entry. */ 73 typedef Elf64_Sym GElf_Sym; 74 75 /* The syminfo section if available contains additional information about 76 every dynamic symbol. */ 77 typedef Elf64_Syminfo GElf_Syminfo; 78 79 /* Relocation table entry without addend (in section of type SHT_REL). */ 80 typedef Elf64_Rel GElf_Rel; 81 82 /* Relocation table entry with addend (in section of type SHT_RELA). */ 83 typedef Elf64_Rela GElf_Rela; 84 85 /* Program segment header. */ 86 typedef Elf64_Phdr GElf_Phdr; 87 88 /* Header of a compressed section. */ 89 typedef Elf64_Chdr GElf_Chdr; 90 91 /* Dynamic section entry. */ 92 typedef Elf64_Dyn GElf_Dyn; 93 94 95 /* Version definition sections. */ 96 typedef Elf64_Verdef GElf_Verdef; 97 98 /* Auxiliary version information. */ 99 typedef Elf64_Verdaux GElf_Verdaux; 100 101 /* Version dependency section. */ 102 typedef Elf64_Verneed GElf_Verneed; 103 104 /* Auxiliary needed version information. */ 105 typedef Elf64_Vernaux GElf_Vernaux; 106 107 108 /* Type for version symbol information. */ 109 typedef Elf64_Versym GElf_Versym; 110 111 112 /* Auxiliary vector. */ 113 typedef Elf64_auxv_t GElf_auxv_t; 114 115 116 /* Note section contents. */ 117 typedef Elf64_Nhdr GElf_Nhdr; 118 119 120 /* Move structure. */ 121 typedef Elf64_Move GElf_Move; 122 123 124 /* Library list structure. */ 125 typedef Elf64_Lib GElf_Lib; 126 127 128 /* How to extract and insert information held in the st_info field. */ 129 130 #define GELF_ST_BIND(val) ELF64_ST_BIND (val) 131 #define GELF_ST_TYPE(val) ELF64_ST_TYPE (val) 132 #define GELF_ST_INFO(bind, type) ELF64_ST_INFO (bind, type) 133 134 /* How to extract information held in the st_other field. */ 135 136 #define GELF_ST_VISIBILITY(val) ELF64_ST_VISIBILITY (val) 137 138 139 /* How to extract and insert information held in the r_info field. */ 140 141 #define GELF_R_SYM(info) ELF64_R_SYM (info) 142 #define GELF_R_TYPE(info) ELF64_R_TYPE (info) 143 #define GELF_R_INFO(sym, type) ELF64_R_INFO (sym, type) 144 145 146 /* How to extract and insert information held in the m_info field. */ 147 #define GELF_M_SYM(info) ELF64_M_SYM (info) 148 #define GELF_M_SIZE(info) ELF64_M_SIZE (info) 149 #define GELF_M_INFO(sym, size) ELF64_M_INFO (sym, size) 150 151 152 /* Get class of the file associated with ELF. */ 153 extern int gelf_getclass (Elf *__elf); 154 155 156 /* Return size of array of COUNT elements of the type denoted by TYPE 157 in the external representation. The binary class is taken from ELF. 158 The result is based on version VERSION of the ELF standard. */ 159 extern size_t gelf_fsize (Elf *__elf, Elf_Type __type, size_t __count, 160 unsigned int __version); 161 162 /* Retrieve object file header. */ 163 extern GElf_Ehdr *gelf_getehdr (Elf *__elf, GElf_Ehdr *__dest); 164 165 /* Update the ELF header. */ 166 extern int gelf_update_ehdr (Elf *__elf, GElf_Ehdr *__src); 167 168 /* Create new ELF header if none exists. Creates an Elf32_Ehdr if CLASS 169 is ELFCLASS32 or an Elf64_Ehdr if CLASS is ELFCLASS64. Returns NULL 170 on error. */ 171 extern void *gelf_newehdr (Elf *__elf, int __class); 172 173 /* Get section at OFFSET. */ 174 extern Elf_Scn *gelf_offscn (Elf *__elf, GElf_Off __offset); 175 176 /* Retrieve section header. */ 177 extern GElf_Shdr *gelf_getshdr (Elf_Scn *__scn, GElf_Shdr *__dst); 178 179 /* Update section header. */ 180 extern int gelf_update_shdr (Elf_Scn *__scn, GElf_Shdr *__src); 181 182 /* Retrieve program header table entry. */ 183 extern GElf_Phdr *gelf_getphdr (Elf *__elf, int __ndx, GElf_Phdr *__dst); 184 185 /* Update the program header. */ 186 extern int gelf_update_phdr (Elf *__elf, int __ndx, GElf_Phdr *__src); 187 188 /* Create new program header with PHNUM entries. Creates either an 189 Elf32_Phdr or an Elf64_Phdr depending on whether the given ELF is 190 ELFCLASS32 or ELFCLASS64. Returns NULL on error. */ 191 extern void *gelf_newphdr (Elf *__elf, size_t __phnum); 192 193 /* Get compression header of section if any. Returns NULL and sets 194 elf_errno if the section isn't compressed or an error occurred. */ 195 extern GElf_Chdr *gelf_getchdr (Elf_Scn *__scn, GElf_Chdr *__dst); 196 197 /* Convert data structure from the representation in the file represented 198 by ELF to their memory representation. */ 199 extern Elf_Data *gelf_xlatetom (Elf *__elf, Elf_Data *__dest, 200 const Elf_Data *__src, unsigned int __encode); 201 202 /* Convert data structure from to the representation in memory 203 represented by ELF file representation. */ 204 extern Elf_Data *gelf_xlatetof (Elf *__elf, Elf_Data *__dest, 205 const Elf_Data *__src, unsigned int __encode); 206 207 208 /* Retrieve REL relocation info at the given index. */ 209 extern GElf_Rel *gelf_getrel (Elf_Data *__data, int __ndx, GElf_Rel *__dst); 210 211 /* Retrieve RELA relocation info at the given index. */ 212 extern GElf_Rela *gelf_getrela (Elf_Data *__data, int __ndx, GElf_Rela *__dst); 213 214 /* Update REL relocation information at given index. */ 215 extern int gelf_update_rel (Elf_Data *__dst, int __ndx, GElf_Rel *__src); 216 217 /* Update RELA relocation information at given index. */ 218 extern int gelf_update_rela (Elf_Data *__dst, int __ndx, GElf_Rela *__src); 219 220 221 /* Retrieve symbol information from the symbol table at the given index. */ 222 extern GElf_Sym *gelf_getsym (Elf_Data *__data, int __ndx, GElf_Sym *__dst); 223 224 /* Update symbol information in the symbol table at the given index. */ 225 extern int gelf_update_sym (Elf_Data *__data, int __ndx, GElf_Sym *__src); 226 227 228 /* Retrieve symbol information and separate section index from the 229 symbol table at the given index. */ 230 extern GElf_Sym *gelf_getsymshndx (Elf_Data *__symdata, Elf_Data *__shndxdata, 231 int __ndx, GElf_Sym *__sym, 232 Elf32_Word *__xshndx); 233 234 /* Update symbol information and separate section index in the symbol 235 table at the given index. */ 236 extern int gelf_update_symshndx (Elf_Data *__symdata, Elf_Data *__shndxdata, 237 int __ndx, GElf_Sym *__sym, 238 Elf32_Word __xshndx); 239 240 241 /* Retrieve additional symbol information from the symbol table at the 242 given index. */ 243 extern GElf_Syminfo *gelf_getsyminfo (Elf_Data *__data, int __ndx, 244 GElf_Syminfo *__dst); 245 246 /* Update additional symbol information in the symbol table at the 247 given index. */ 248 extern int gelf_update_syminfo (Elf_Data *__data, int __ndx, 249 GElf_Syminfo *__src); 250 251 252 /* Get information from dynamic table at the given index. */ 253 extern GElf_Dyn *gelf_getdyn (Elf_Data *__data, int __ndx, GElf_Dyn *__dst); 254 255 /* Update information in dynamic table at the given index. */ 256 extern int gelf_update_dyn (Elf_Data *__dst, int __ndx, GElf_Dyn *__src); 257 258 259 /* Get move structure at the given index. */ 260 extern GElf_Move *gelf_getmove (Elf_Data *__data, int __ndx, GElf_Move *__dst); 261 262 /* Update move structure at the given index. */ 263 extern int gelf_update_move (Elf_Data *__data, int __ndx, 264 GElf_Move *__src); 265 266 267 /* Get library from table at the given index. */ 268 extern GElf_Lib *gelf_getlib (Elf_Data *__data, int __ndx, GElf_Lib *__dst); 269 270 /* Update library in table at the given index. */ 271 extern int gelf_update_lib (Elf_Data *__data, int __ndx, GElf_Lib *__src); 272 273 274 275 /* Retrieve symbol version information at given index. */ 276 extern GElf_Versym *gelf_getversym (Elf_Data *__data, int __ndx, 277 GElf_Versym *__dst); 278 279 /* Update symbol version information. */ 280 extern int gelf_update_versym (Elf_Data *__data, int __ndx, 281 GElf_Versym *__src); 282 283 284 /* Retrieve required symbol version information at given offset. */ 285 extern GElf_Verneed *gelf_getverneed (Elf_Data *__data, int __offset, 286 GElf_Verneed *__dst); 287 288 /* Update required symbol version information. */ 289 extern int gelf_update_verneed (Elf_Data *__data, int __offset, 290 GElf_Verneed *__src); 291 292 /* Retrieve additional required symbol version information at given offset. */ 293 extern GElf_Vernaux *gelf_getvernaux (Elf_Data *__data, int __offset, 294 GElf_Vernaux *__dst); 295 296 /* Update additional required symbol version information. */ 297 extern int gelf_update_vernaux (Elf_Data *__data, int __offset, 298 GElf_Vernaux *__src); 299 300 301 /* Retrieve symbol version definition information at given offset. */ 302 extern GElf_Verdef *gelf_getverdef (Elf_Data *__data, int __offset, 303 GElf_Verdef *__dst); 304 305 /* Update symbol version definition information. */ 306 extern int gelf_update_verdef (Elf_Data *__data, int __offset, 307 GElf_Verdef *__src); 308 309 /* Retrieve additional symbol version definition information at given 310 offset. */ 311 extern GElf_Verdaux *gelf_getverdaux (Elf_Data *__data, int __offset, 312 GElf_Verdaux *__dst); 313 314 /* Update additional symbol version definition information. */ 315 extern int gelf_update_verdaux (Elf_Data *__data, int __offset, 316 GElf_Verdaux *__src); 317 318 319 /* Get auxv entry at the given index. */ 320 extern GElf_auxv_t *gelf_getauxv (Elf_Data *__data, int __ndx, 321 GElf_auxv_t *__dst); 322 323 /* Update auxv entry at the given index. */ 324 extern int gelf_update_auxv (Elf_Data *__data, int __ndx, GElf_auxv_t *__src); 325 326 327 /* Get note header at the given offset into the data, and the offsets of 328 the note's name and descriptor data. Returns the offset of the next 329 note header, or 0 for an invalid offset or corrupt note header. */ 330 extern size_t gelf_getnote (Elf_Data *__data, size_t __offset, 331 GElf_Nhdr *__result, 332 size_t *__name_offset, size_t *__desc_offset); 333 334 335 /* Compute simple checksum from permanent parts of the ELF file. */ 336 extern long int gelf_checksum (Elf *__elf); 337 338 #ifdef __cplusplus 339 } 340 #endif 341 342 #endif /* gelf.h */ 343