internal.h revision 38889
1/* ELF support for BFD. 2 Copyright (C) 1991, 92, 93, 94, 95, 1997 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 8This file is part of BFD, the Binary File Descriptor library. 9 10This program is free software; you can redistribute it and/or modify 11it under the terms of the GNU General Public License as published by 12the Free Software Foundation; either version 2 of the License, or 13(at your option) any later version. 14 15This program is distributed in the hope that it will be useful, 16but WITHOUT ANY WARRANTY; without even the implied warranty of 17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18GNU General Public License for more details. 19 20You should have received a copy of the GNU General Public License 21along with this program; if not, write to the Free Software 22Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 23 24 25/* This file is part of ELF support for BFD, and contains the portions 26 that describe how ELF is represented internally in the BFD library. 27 I.E. it describes the in-memory 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 32/* NOTE that these structures are not kept in the same order as they appear 33 in the object file. In some cases they've been reordered for more optimal 34 packing under various circumstances. */ 35 36#ifndef _ELF_INTERNAL_H 37#define _ELF_INTERNAL_H 38 39/* ELF Header */ 40 41#define EI_NIDENT 16 /* Size of e_ident[] */ 42 43typedef struct elf_internal_ehdr { 44 unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ 45 bfd_vma e_entry; /* Entry point virtual address */ 46 bfd_size_type e_phoff; /* Program header table file offset */ 47 bfd_size_type e_shoff; /* Section header table file offset */ 48 unsigned long e_version; /* Identifies object file version */ 49 unsigned long e_flags; /* Processor-specific flags */ 50 unsigned short e_type; /* Identifies object file type */ 51 unsigned short e_machine; /* Specifies required architecture */ 52 unsigned short e_ehsize; /* ELF header size in bytes */ 53 unsigned short e_phentsize; /* Program header table entry size */ 54 unsigned short e_phnum; /* Program header table entry count */ 55 unsigned short e_shentsize; /* Section header table entry size */ 56 unsigned short e_shnum; /* Section header table entry count */ 57 unsigned short e_shstrndx; /* Section header string table index */ 58} Elf_Internal_Ehdr; 59 60#define elf32_internal_ehdr elf_internal_ehdr 61#define Elf32_Internal_Ehdr Elf_Internal_Ehdr 62#define elf64_internal_ehdr elf_internal_ehdr 63#define Elf64_Internal_Ehdr Elf_Internal_Ehdr 64 65/* Program header */ 66 67struct elf_internal_phdr { 68 unsigned long p_type; /* Identifies program segment type */ 69 unsigned long p_flags; /* Segment flags */ 70 bfd_vma p_offset; /* Segment file offset */ 71 bfd_vma p_vaddr; /* Segment virtual address */ 72 bfd_vma p_paddr; /* Segment physical address */ 73 bfd_vma p_filesz; /* Segment size in file */ 74 bfd_vma p_memsz; /* Segment size in memory */ 75 bfd_vma p_align; /* Segment alignment, file & memory */ 76}; 77 78typedef struct elf_internal_phdr Elf_Internal_Phdr; 79#define elf32_internal_phdr elf_internal_phdr 80#define Elf32_Internal_Phdr Elf_Internal_Phdr 81#define elf64_internal_phdr elf_internal_phdr 82#define Elf64_Internal_Phdr Elf_Internal_Phdr 83 84/* Section header */ 85 86typedef struct elf_internal_shdr { 87 unsigned int sh_name; /* Section name, index in string tbl */ 88 unsigned int sh_type; /* Type of section */ 89 bfd_vma sh_flags; /* Miscellaneous section attributes */ 90 bfd_vma sh_addr; /* Section virtual addr at execution */ 91 bfd_size_type sh_size; /* Size of section in bytes */ 92 bfd_size_type sh_entsize; /* Entry size if section holds table */ 93 unsigned long sh_link; /* Index of another section */ 94 unsigned long sh_info; /* Additional section information */ 95 file_ptr sh_offset; /* Section file offset */ 96 unsigned int sh_addralign; /* Section alignment */ 97 98 /* The internal rep also has some cached info associated with it. */ 99 asection * bfd_section; /* Associated BFD section. */ 100 PTR contents; /* Section contents. */ 101} Elf_Internal_Shdr; 102 103#define elf32_internal_shdr elf_internal_shdr 104#define Elf32_Internal_Shdr Elf_Internal_Shdr 105#define elf64_internal_shdr elf_internal_shdr 106#define Elf64_Internal_Shdr Elf_Internal_Shdr 107 108/* Symbol table entry */ 109 110struct elf_internal_sym { 111 bfd_vma st_value; /* Value of the symbol */ 112 bfd_vma st_size; /* Associated symbol size */ 113 unsigned long st_name; /* Symbol name, index in string tbl */ 114 unsigned char st_info; /* Type and binding attributes */ 115 unsigned char st_other; /* No defined meaning, 0 */ 116 unsigned short st_shndx; /* Associated section index */ 117}; 118 119typedef struct elf_internal_sym Elf_Internal_Sym; 120 121#define elf32_internal_sym elf_internal_sym 122#define elf64_internal_sym elf_internal_sym 123#define Elf32_Internal_Sym Elf_Internal_Sym 124#define Elf64_Internal_Sym Elf_Internal_Sym 125 126/* Note segments */ 127 128typedef struct elf_internal_note { 129 unsigned long namesz; /* Size of entry's owner string */ 130 unsigned long descsz; /* Size of the note descriptor */ 131 unsigned long type; /* Interpretation of the descriptor */ 132 char name[1]; /* Start of the name+desc data */ 133} Elf_Internal_Note; 134#define Elf32_Internal_Note Elf_Internal_Note 135#define elf32_internal_note elf_internal_note 136 137/* Relocation Entries */ 138 139typedef struct elf_internal_rel { 140 bfd_vma r_offset; /* Location at which to apply the action */ 141 /* This needs to support 64-bit values in elf64. */ 142 bfd_vma r_info; /* index and type of relocation */ 143} Elf_Internal_Rel; 144 145#define elf32_internal_rel elf_internal_rel 146#define Elf32_Internal_Rel Elf_Internal_Rel 147#define elf64_internal_rel elf_internal_rel 148#define Elf64_Internal_Rel Elf_Internal_Rel 149 150typedef struct elf_internal_rela { 151 bfd_vma r_offset; /* Location at which to apply the action */ 152 bfd_vma r_info; /* Index and Type of relocation */ 153 bfd_signed_vma r_addend; /* Constant addend used to compute value */ 154} Elf_Internal_Rela; 155 156#define elf32_internal_rela elf_internal_rela 157#define elf64_internal_rela elf_internal_rela 158#define Elf32_Internal_Rela Elf_Internal_Rela 159#define Elf64_Internal_Rela Elf_Internal_Rela 160 161/* dynamic section structure */ 162 163typedef struct elf_internal_dyn { 164 /* This needs to support 64-bit values in elf64. */ 165 bfd_vma d_tag; /* entry tag value */ 166 union { 167 /* This needs to support 64-bit values in elf64. */ 168 bfd_vma d_val; 169 bfd_vma d_ptr; 170 } d_un; 171} Elf_Internal_Dyn; 172 173#define elf32_internal_dyn elf_internal_dyn 174#define elf64_internal_dyn elf_internal_dyn 175#define Elf32_Internal_Dyn Elf_Internal_Dyn 176#define Elf64_Internal_Dyn Elf_Internal_Dyn 177 178/* This structure appears in a SHT_GNU_verdef section. */ 179 180typedef struct elf_internal_verdef { 181 unsigned short vd_version; /* Version number of structure. */ 182 unsigned short vd_flags; /* Flags (VER_FLG_*). */ 183 unsigned short vd_ndx; /* Version index. */ 184 unsigned short vd_cnt; /* Number of verdaux entries. */ 185 unsigned long vd_hash; /* Hash of name. */ 186 unsigned long vd_aux; /* Offset to verdaux entries. */ 187 unsigned long vd_next; /* Offset to next verdef. */ 188 189 /* These fields are set up when BFD reads in the structure. FIXME: 190 It would be cleaner to store these in a different structure. */ 191 bfd *vd_bfd; /* BFD. */ 192 const char *vd_nodename; /* Version name. */ 193 struct elf_internal_verdef *vd_nextdef; /* vd_next as pointer. */ 194 struct elf_internal_verdaux *vd_auxptr; /* vd_aux as pointer. */ 195 unsigned int vd_exp_refno; /* Used by the linker. */ 196} Elf_Internal_Verdef; 197 198/* This structure appears in a SHT_GNU_verdef section. */ 199 200typedef struct elf_internal_verdaux { 201 unsigned long vda_name; /* String table offset of name. */ 202 unsigned long vda_next; /* Offset to next verdaux. */ 203 204 /* These fields are set up when BFD reads in the structure. FIXME: 205 It would be cleaner to store these in a different structure. */ 206 const char *vda_nodename; /* vda_name as pointer. */ 207 struct elf_internal_verdaux *vda_nextptr; /* vda_next as pointer. */ 208} Elf_Internal_Verdaux; 209 210/* This structure appears in a SHT_GNU_verneed section. */ 211 212typedef struct elf_internal_verneed { 213 unsigned short vn_version; /* Version number of structure. */ 214 unsigned short vn_cnt; /* Number of vernaux entries. */ 215 unsigned long vn_file; /* String table offset of library name. */ 216 unsigned long vn_aux; /* Offset to vernaux entries. */ 217 unsigned long vn_next; /* Offset to next verneed. */ 218 219 /* These fields are set up when BFD reads in the structure. FIXME: 220 It would be cleaner to store these in a different structure. */ 221 bfd *vn_bfd; /* BFD. */ 222 const char *vn_filename; /* vn_file as pointer. */ 223 struct elf_internal_vernaux *vn_auxptr; /* vn_aux as pointer. */ 224 struct elf_internal_verneed *vn_nextref; /* vn_nextref as pointer. */ 225} Elf_Internal_Verneed; 226 227/* This structure appears in a SHT_GNU_verneed section. */ 228 229typedef struct elf_internal_vernaux { 230 unsigned long vna_hash; /* Hash of dependency name. */ 231 unsigned short vna_flags; /* Flags (VER_FLG_*). */ 232 unsigned short vna_other; /* Unused. */ 233 unsigned long vna_name; /* String table offset to version name. */ 234 unsigned long vna_next; /* Offset to next vernaux. */ 235 236 /* These fields are set up when BFD reads in the structure. FIXME: 237 It would be cleaner to store these in a different structure. */ 238 const char *vna_nodename; /* vna_name as pointer. */ 239 struct elf_internal_vernaux *vna_nextptr; /* vna_next as pointer. */ 240} Elf_Internal_Vernaux; 241 242/* This structure appears in a SHT_GNU_versym section. This is not a 243 standard ELF structure; ELF just uses Elf32_Half. */ 244 245typedef struct elf_internal_versym { 246 unsigned short vs_vers; 247} Elf_Internal_Versym; 248 249#define elf32_internal_verdef elf_internal_verdef 250#define elf64_internal_verdef elf_internal_verdef 251#define elf32_internal_verdaux elf_internal_verdaux 252#define elf64_internal_verdaux elf_internal_verdaux 253#define elf32_internal_verneed elf_internal_verneed 254#define elf64_internal_verneed elf_internal_verneed 255#define elf32_internal_vernaux elf_internal_vernaux 256#define elf64_internal_vernaux elf_internal_vernaux 257#define elf32_internal_versym elf_internal_versym 258#define elf64_internal_versym elf_internal_versym 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/* This structure is used to describe how sections should be assigned 272 to program segments. */ 273 274struct elf_segment_map 275{ 276 /* Next program segment. */ 277 struct elf_segment_map *next; 278 /* Program segment type. */ 279 unsigned long p_type; 280 /* Program segment flags. */ 281 unsigned long p_flags; 282 /* Program segment physical address. */ 283 bfd_vma p_paddr; 284 /* Whether the p_flags field is valid; if not, the flags are based 285 on the section flags. */ 286 unsigned int p_flags_valid : 1; 287 /* Whether the p_paddr field is valid; if not, the physical address 288 is based on the section lma values. */ 289 unsigned int p_paddr_valid : 1; 290 /* Whether this segment includes the file header. */ 291 unsigned int includes_filehdr : 1; 292 /* Whether this segment includes the program headers. */ 293 unsigned int includes_phdrs : 1; 294 /* Number of sections (may be 0). */ 295 unsigned int count; 296 /* Sections. Actual number of elements is in count field. */ 297 asection *sections[1]; 298}; 299 300#endif /* _ELF_INTERNAL_H */ 301