1 /* ELF support for BFD. 2 Copyright 1991, 1992, 1993, 1994, 1995, 1997, 1998, 2000, 2001 3 Free Software Foundation, Inc. 4 5 Written by Fred Fish @ Cygnus Support, from information published 6 in "UNIX System V Release 4, Programmers Guide: ANSI C and 7 Programming Support Tools". 8 9 This file is part of BFD, the Binary File Descriptor library. 10 11 This program is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 2 of the License, or 14 (at your option) any later version. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program; if not, write to the Free Software 23 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 24 25 26 /* This file is part of ELF support for BFD, and contains the portions 27 that describe how ELF is represented internally in the BFD library. 28 I.E. it describes the in-memory representation of ELF. It requires 29 the elf-common.h file which contains the portions that are common to 30 both the internal and external representations. */ 31 32 33 /* NOTE that these structures are not kept in the same order as they appear 34 in the object file. In some cases they've been reordered for more optimal 35 packing under various circumstances. */ 36 37 #ifndef _ELF_INTERNAL_H 38 #define _ELF_INTERNAL_H 39 40 /* ELF Header */ 41 42 #define EI_NIDENT 16 /* Size of e_ident[] */ 43 44 typedef struct elf_internal_ehdr { 45 unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ 46 bfd_vma e_entry; /* Entry point virtual address */ 47 bfd_size_type e_phoff; /* Program header table file offset */ 48 bfd_size_type e_shoff; /* Section header table file offset */ 49 unsigned long e_version; /* Identifies object file version */ 50 unsigned long e_flags; /* Processor-specific flags */ 51 unsigned short e_type; /* Identifies object file type */ 52 unsigned short e_machine; /* Specifies required architecture */ 53 unsigned int e_ehsize; /* ELF header size in bytes */ 54 unsigned int e_phentsize; /* Program header table entry size */ 55 unsigned int e_phnum; /* Program header table entry count */ 56 unsigned int e_shentsize; /* Section header table entry size */ 57 unsigned int e_shnum; /* Section header table entry count */ 58 unsigned int e_shstrndx; /* Section header string table index */ 59 } Elf_Internal_Ehdr; 60 61 #define elf32_internal_ehdr elf_internal_ehdr 62 #define Elf32_Internal_Ehdr Elf_Internal_Ehdr 63 #define elf64_internal_ehdr elf_internal_ehdr 64 #define Elf64_Internal_Ehdr Elf_Internal_Ehdr 65 66 /* Program header */ 67 68 struct elf_internal_phdr { 69 unsigned long p_type; /* Identifies program segment type */ 70 unsigned long p_flags; /* Segment flags */ 71 bfd_vma p_offset; /* Segment file offset */ 72 bfd_vma p_vaddr; /* Segment virtual address */ 73 bfd_vma p_paddr; /* Segment physical address */ 74 bfd_vma p_filesz; /* Segment size in file */ 75 bfd_vma p_memsz; /* Segment size in memory */ 76 bfd_vma p_align; /* Segment alignment, file & memory */ 77 }; 78 79 typedef struct elf_internal_phdr Elf_Internal_Phdr; 80 #define elf32_internal_phdr elf_internal_phdr 81 #define Elf32_Internal_Phdr Elf_Internal_Phdr 82 #define elf64_internal_phdr elf_internal_phdr 83 #define Elf64_Internal_Phdr Elf_Internal_Phdr 84 85 /* Section header */ 86 87 typedef struct elf_internal_shdr { 88 unsigned int sh_name; /* Section name, index in string tbl */ 89 unsigned int sh_type; /* Type of section */ 90 bfd_vma sh_flags; /* Miscellaneous section attributes */ 91 bfd_vma sh_addr; /* Section virtual addr at execution */ 92 bfd_size_type sh_size; /* Size of section in bytes */ 93 bfd_size_type sh_entsize; /* Entry size if section holds table */ 94 unsigned long sh_link; /* Index of another section */ 95 unsigned long sh_info; /* Additional section information */ 96 file_ptr sh_offset; /* Section file offset */ 97 unsigned int sh_addralign; /* Section alignment */ 98 99 /* The internal rep also has some cached info associated with it. */ 100 asection * bfd_section; /* Associated BFD section. */ 101 unsigned char *contents; /* Section contents. */ 102 } Elf_Internal_Shdr; 103 104 #define elf32_internal_shdr elf_internal_shdr 105 #define Elf32_Internal_Shdr Elf_Internal_Shdr 106 #define elf64_internal_shdr elf_internal_shdr 107 #define Elf64_Internal_Shdr Elf_Internal_Shdr 108 109 /* Symbol table entry */ 110 111 struct elf_internal_sym { 112 bfd_vma st_value; /* Value of the symbol */ 113 bfd_vma st_size; /* Associated symbol size */ 114 unsigned long st_name; /* Symbol name, index in string tbl */ 115 unsigned char st_info; /* Type and binding attributes */ 116 unsigned char st_other; /* Visibilty, and target specific */ 117 unsigned int st_shndx; /* Associated section index */ 118 }; 119 120 typedef struct elf_internal_sym Elf_Internal_Sym; 121 122 #define elf32_internal_sym elf_internal_sym 123 #define elf64_internal_sym elf_internal_sym 124 #define Elf32_Internal_Sym Elf_Internal_Sym 125 #define Elf64_Internal_Sym Elf_Internal_Sym 126 127 /* Note segments */ 128 129 typedef struct elf_internal_note { 130 unsigned long namesz; /* Size of entry's owner string */ 131 unsigned long descsz; /* Size of the note descriptor */ 132 unsigned long type; /* Interpretation of the descriptor */ 133 char * namedata; /* Start of the name+desc data */ 134 char * descdata; /* Start of the desc data */ 135 bfd_vma descpos; /* File offset of the descdata */ 136 } Elf_Internal_Note; 137 #define Elf32_Internal_Note Elf_Internal_Note 138 #define elf32_internal_note elf_internal_note 139 140 /* Relocation Entries */ 141 142 typedef struct elf_internal_rel { 143 bfd_vma r_offset; /* Location at which to apply the action */ 144 /* This needs to support 64-bit values in elf64. */ 145 bfd_vma r_info; /* index and type of relocation */ 146 } Elf_Internal_Rel; 147 148 #define elf32_internal_rel elf_internal_rel 149 #define Elf32_Internal_Rel Elf_Internal_Rel 150 #define elf64_internal_rel elf_internal_rel 151 #define Elf64_Internal_Rel Elf_Internal_Rel 152 153 typedef struct elf_internal_rela { 154 bfd_vma r_offset; /* Location at which to apply the action */ 155 bfd_vma r_info; /* Index and Type of relocation */ 156 bfd_vma r_addend; /* Constant addend used to compute value */ 157 } Elf_Internal_Rela; 158 159 #define elf32_internal_rela elf_internal_rela 160 #define elf64_internal_rela elf_internal_rela 161 #define Elf32_Internal_Rela Elf_Internal_Rela 162 #define Elf64_Internal_Rela Elf_Internal_Rela 163 164 /* dynamic section structure */ 165 166 typedef struct elf_internal_dyn { 167 /* This needs to support 64-bit values in elf64. */ 168 bfd_vma d_tag; /* entry tag value */ 169 union { 170 /* This needs to support 64-bit values in elf64. */ 171 bfd_vma d_val; 172 bfd_vma d_ptr; 173 } d_un; 174 } Elf_Internal_Dyn; 175 176 #define elf32_internal_dyn elf_internal_dyn 177 #define elf64_internal_dyn elf_internal_dyn 178 #define Elf32_Internal_Dyn Elf_Internal_Dyn 179 #define Elf64_Internal_Dyn Elf_Internal_Dyn 180 181 /* This structure appears in a SHT_GNU_verdef section. */ 182 183 typedef struct elf_internal_verdef { 184 unsigned short vd_version; /* Version number of structure. */ 185 unsigned short vd_flags; /* Flags (VER_FLG_*). */ 186 unsigned short vd_ndx; /* Version index. */ 187 unsigned short vd_cnt; /* Number of verdaux entries. */ 188 unsigned long vd_hash; /* Hash of name. */ 189 unsigned long vd_aux; /* Offset to verdaux entries. */ 190 unsigned long vd_next; /* Offset to next verdef. */ 191 192 /* These fields are set up when BFD reads in the structure. FIXME: 193 It would be cleaner to store these in a different structure. */ 194 bfd *vd_bfd; /* BFD. */ 195 const char *vd_nodename; /* Version name. */ 196 struct elf_internal_verdef *vd_nextdef; /* vd_next as pointer. */ 197 struct elf_internal_verdaux *vd_auxptr; /* vd_aux as pointer. */ 198 unsigned int vd_exp_refno; /* Used by the linker. */ 199 } Elf_Internal_Verdef; 200 201 /* This structure appears in a SHT_GNU_verdef section. */ 202 203 typedef struct elf_internal_verdaux { 204 unsigned long vda_name; /* String table offset of name. */ 205 unsigned long vda_next; /* Offset to next verdaux. */ 206 207 /* These fields are set up when BFD reads in the structure. FIXME: 208 It would be cleaner to store these in a different structure. */ 209 const char *vda_nodename; /* vda_name as pointer. */ 210 struct elf_internal_verdaux *vda_nextptr; /* vda_next as pointer. */ 211 } Elf_Internal_Verdaux; 212 213 /* This structure appears in a SHT_GNU_verneed section. */ 214 215 typedef struct elf_internal_verneed { 216 unsigned short vn_version; /* Version number of structure. */ 217 unsigned short vn_cnt; /* Number of vernaux entries. */ 218 unsigned long vn_file; /* String table offset of library name. */ 219 unsigned long vn_aux; /* Offset to vernaux entries. */ 220 unsigned long vn_next; /* Offset to next verneed. */ 221 222 /* These fields are set up when BFD reads in the structure. FIXME: 223 It would be cleaner to store these in a different structure. */ 224 bfd *vn_bfd; /* BFD. */ 225 const char *vn_filename; /* vn_file as pointer. */ 226 struct elf_internal_vernaux *vn_auxptr; /* vn_aux as pointer. */ 227 struct elf_internal_verneed *vn_nextref; /* vn_nextref as pointer. */ 228 } Elf_Internal_Verneed; 229 230 /* This structure appears in a SHT_GNU_verneed section. */ 231 232 typedef struct elf_internal_vernaux { 233 unsigned long vna_hash; /* Hash of dependency name. */ 234 unsigned short vna_flags; /* Flags (VER_FLG_*). */ 235 unsigned short vna_other; /* Unused. */ 236 unsigned long vna_name; /* String table offset to version name. */ 237 unsigned long vna_next; /* Offset to next vernaux. */ 238 239 /* These fields are set up when BFD reads in the structure. FIXME: 240 It would be cleaner to store these in a different structure. */ 241 const char *vna_nodename; /* vna_name as pointer. */ 242 struct elf_internal_vernaux *vna_nextptr; /* vna_next as pointer. */ 243 } Elf_Internal_Vernaux; 244 245 /* This structure appears in a SHT_GNU_versym section. This is not a 246 standard ELF structure; ELF just uses Elf32_Half. */ 247 248 typedef struct elf_internal_versym { 249 unsigned short vs_vers; 250 } Elf_Internal_Versym; 251 252 /* Structure for syminfo section. */ 253 typedef struct 254 { 255 unsigned short int si_boundto; 256 unsigned short int si_flags; 257 } Elf_Internal_Syminfo; 258 259 260 #define elf32_internal_verdef elf_internal_verdef 261 #define elf64_internal_verdef elf_internal_verdef 262 #define elf32_internal_verdaux elf_internal_verdaux 263 #define elf64_internal_verdaux elf_internal_verdaux 264 #define elf32_internal_verneed elf_internal_verneed 265 #define elf64_internal_verneed elf_internal_verneed 266 #define elf32_internal_vernaux elf_internal_vernaux 267 #define elf64_internal_vernaux elf_internal_vernaux 268 #define elf32_internal_versym elf_internal_versym 269 #define elf64_internal_versym elf_internal_versym 270 271 #define Elf32_Internal_Verdef Elf_Internal_Verdef 272 #define Elf64_Internal_Verdef Elf_Internal_Verdef 273 #define Elf32_Internal_Verdaux Elf_Internal_Verdaux 274 #define Elf64_Internal_Verdaux Elf_Internal_Verdaux 275 #define Elf32_Internal_Verneed Elf_Internal_Verneed 276 #define Elf64_Internal_Verneed Elf_Internal_Verneed 277 #define Elf32_Internal_Vernaux Elf_Internal_Vernaux 278 #define Elf64_Internal_Vernaux Elf_Internal_Vernaux 279 #define Elf32_Internal_Versym Elf_Internal_Versym 280 #define Elf64_Internal_Versym Elf_Internal_Versym 281 #define Elf32_Internal_Syminfo Elf_Internal_Syminfo 282 #define Elf64_Internal_Syminfo Elf_Internal_Syminfo 283 284 /* This structure is used to describe how sections should be assigned 285 to program segments. */ 286 287 struct elf_segment_map 288 { 289 /* Next program segment. */ 290 struct elf_segment_map *next; 291 /* Program segment type. */ 292 unsigned long p_type; 293 /* Program segment flags. */ 294 unsigned long p_flags; 295 /* Program segment physical address. */ 296 bfd_vma p_paddr; 297 /* Whether the p_flags field is valid; if not, the flags are based 298 on the section flags. */ 299 unsigned int p_flags_valid : 1; 300 /* Whether the p_paddr field is valid; if not, the physical address 301 is based on the section lma values. */ 302 unsigned int p_paddr_valid : 1; 303 /* Whether this segment includes the file header. */ 304 unsigned int includes_filehdr : 1; 305 /* Whether this segment includes the program headers. */ 306 unsigned int includes_phdrs : 1; 307 /* Number of sections (may be 0). */ 308 unsigned int count; 309 /* Sections. Actual number of elements is in count field. */ 310 asection *sections[1]; 311 }; 312 313 #endif /* _ELF_INTERNAL_H */ 314