include/elf/external.h

   1 /* ELF support for BFD.
   2    Copyright (C) 1991, 92, 93, 95, 97, 98, 1999 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 2 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., 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 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 /* ELF Header (32-bit implementations) */
  38
  39 typedef struct {
  40   unsigned char e_ident[16];            /* ELF "magic number" */
  41   unsigned char e_type[2];              /* Identifies object file type */
  42   unsigned char e_machine[2];           /* Specifies required architecture */
  43   unsigned char e_version[4];           /* Identifies object file version */
  44   unsigned char e_entry[4];             /* Entry point virtual address */
  45   unsigned char e_phoff[4];             /* Program header table file offset */
  46   unsigned char e_shoff[4];             /* Section header table file offset */
  47   unsigned char e_flags[4];             /* Processor-specific flags */
  48   unsigned char e_ehsize[2];            /* ELF header size in bytes */
  49   unsigned char e_phentsize[2];         /* Program header table entry size */
  50   unsigned char e_phnum[2];             /* Program header table entry count */
  51   unsigned char e_shentsize[2];         /* Section header table entry size */
  52   unsigned char e_shnum[2];             /* Section header table entry count */
  53   unsigned char e_shstrndx[2];          /* Section header string table index */
  54 } Elf32_External_Ehdr;
  55
  56 typedef struct {
  57   unsigned char e_ident[16];            /* ELF "magic number" */
  58   unsigned char e_type[2];              /* Identifies object file type */
  59   unsigned char e_machine[2];           /* Specifies required architecture */
  60   unsigned char e_version[4];           /* Identifies object file version */
  61   unsigned char e_entry[8];             /* Entry point virtual address */
  62   unsigned char e_phoff[8];             /* Program header table file offset */
  63   unsigned char e_shoff[8];             /* Section header table file offset */
  64   unsigned char e_flags[4];             /* Processor-specific flags */
  65   unsigned char e_ehsize[2];            /* ELF header size in bytes */
  66   unsigned char e_phentsize[2];         /* Program header table entry size */
  67   unsigned char e_phnum[2];             /* Program header table entry count */
  68   unsigned char e_shentsize[2];         /* Section header table entry size */
  69   unsigned char e_shnum[2];             /* Section header table entry count */
  70   unsigned char e_shstrndx[2];          /* Section header string table index */
  71 } Elf64_External_Ehdr;
  72
  73 /* Program header */
  74
  75 typedef struct {
  76   unsigned char p_type[4];              /* Identifies program segment type */
  77   unsigned char p_offset[4];            /* Segment file offset */
  78   unsigned char p_vaddr[4];             /* Segment virtual address */
  79   unsigned char p_paddr[4];             /* Segment physical address */
  80   unsigned char p_filesz[4];            /* Segment size in file */
  81   unsigned char p_memsz[4];             /* Segment size in memory */
  82   unsigned char p_flags[4];             /* Segment flags */
  83   unsigned char p_align[4];             /* Segment alignment, file & memory */
  84 } Elf32_External_Phdr;
  85
  86 typedef struct {
  87   unsigned char p_type[4];              /* Identifies program segment type */
  88   unsigned char p_flags[4];             /* Segment flags */
  89   unsigned char p_offset[8];            /* Segment file offset */
  90   unsigned char p_vaddr[8];             /* Segment virtual address */
  91   unsigned char p_paddr[8];             /* Segment physical address */
  92   unsigned char p_filesz[8];            /* Segment size in file */
  93   unsigned char p_memsz[8];             /* Segment size in memory */
  94   unsigned char p_align[8];             /* Segment alignment, file & memory */
  95 } Elf64_External_Phdr;
  96
  97 /* Section header */
  98
  99 typedef struct {
 100   unsigned char sh_name[4];             /* Section name, index in string tbl */
 101   unsigned char sh_type[4];             /* Type of section */
 102   unsigned char sh_flags[4];            /* Miscellaneous section attributes */
 103   unsigned char sh_addr[4];             /* Section virtual addr at execution */
 104   unsigned char sh_offset[4];           /* Section file offset */
 105   unsigned char sh_size[4];             /* Size of section in bytes */
 106   unsigned char sh_link[4];             /* Index of another section */
 107   unsigned char sh_info[4];             /* Additional section information */
 108   unsigned char sh_addralign[4];        /* Section alignment */
 109   unsigned char sh_entsize[4];          /* Entry size if section holds table */
 110 } Elf32_External_Shdr;
 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[8];            /* Miscellaneous section attributes */
 116   unsigned char sh_addr[8];             /* Section virtual addr at execution */
 117   unsigned char sh_offset[8];           /* Section file offset */
 118   unsigned char sh_size[8];             /* 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[8];        /* Section alignment */
 122   unsigned char sh_entsize[8];          /* Entry size if section holds table */
 123 } Elf64_External_Shdr;
 124
 125 /* Symbol table entry */
 126
 127 typedef struct {
 128   unsigned char st_name[4];             /* Symbol name, index in string tbl */
 129   unsigned char st_value[4];            /* Value of the symbol */
 130   unsigned char st_size[4];             /* Associated symbol size */
 131   unsigned char st_info[1];             /* Type and binding attributes */
 132   unsigned char st_other[1];            /* No defined meaning, 0 */
 133   unsigned char st_shndx[2];            /* Associated section index */
 134 } Elf32_External_Sym;
 135
 136 typedef struct {
 137   unsigned char st_name[4];             /* Symbol name, index in string tbl */
 138   unsigned char st_info[1];             /* Type and binding attributes */
 139   unsigned char st_other[1];            /* No defined meaning, 0 */
 140   unsigned char st_shndx[2];            /* Associated section index */
 141   unsigned char st_value[8];            /* Value of the symbol */
 142   unsigned char st_size[8];             /* Associated symbol size */
 143 } Elf64_External_Sym;
 144
 145 /* Note segments */
 146
 147 typedef struct {
 148   unsigned char namesz[4];              /* Size of entry's owner string */
 149   unsigned char descsz[4];              /* Size of the note descriptor */
 150   unsigned char type[4];                /* Interpretation of the descriptor */
 151   char          name[1];                /* Start of the name+desc data */
 152 } Elf_External_Note;
 153
 154 /* Relocation Entries */
 155 typedef struct {
 156   unsigned char r_offset[4];    /* Location at which to apply the action */
 157   unsigned char r_info[4];      /* index and type of relocation */
 158 } Elf32_External_Rel;
 159
 160 typedef struct {
 161   unsigned char r_offset[4];    /* Location at which to apply the action */
 162   unsigned char r_info[4];      /* index and type of relocation */
 163   unsigned char r_addend[4];    /* Constant addend used to compute value */
 164 } Elf32_External_Rela;
 165
 166 typedef struct {
 167   unsigned char r_offset[8];    /* Location at which to apply the action */
 168   unsigned char r_info[8];      /* index and type of relocation */
 169 } Elf64_External_Rel;
 170
 171 typedef struct {
 172   unsigned char r_offset[8];    /* Location at which to apply the action */
 173   unsigned char r_info[8];      /* index and type of relocation */
 174   unsigned char r_addend[8];    /* Constant addend used to compute value */
 175 } Elf64_External_Rela;
 176
 177 /* dynamic section structure */
 178
 179 typedef struct {
 180   unsigned char d_tag[4];               /* entry tag value */
 181   union {
 182     unsigned char       d_val[4];
 183     unsigned char       d_ptr[4];
 184   } d_un;
 185 } Elf32_External_Dyn;
 186
 187 typedef struct {
 188   unsigned char d_tag[8];               /* entry tag value */
 189   union {
 190     unsigned char       d_val[8];
 191     unsigned char       d_ptr[8];
 192   } d_un;
 193 } Elf64_External_Dyn;
 194
 195 /* The version structures are currently size independent.  They are
 196    named without a 32 or 64.  If that ever changes, these structures
 197    will need to be renamed.  */
 198
 199 /* This structure appears in a SHT_GNU_verdef section.  */
 200
 201 typedef struct {
 202   unsigned char         vd_version[2];
 203   unsigned char         vd_flags[2];
 204   unsigned char         vd_ndx[2];
 205   unsigned char         vd_cnt[2];
 206   unsigned char         vd_hash[4];
 207   unsigned char         vd_aux[4];
 208   unsigned char         vd_next[4];
 209 } Elf_External_Verdef;
 210
 211 /* This structure appears in a SHT_GNU_verdef section.  */
 212
 213 typedef struct {
 214   unsigned char         vda_name[4];
 215   unsigned char         vda_next[4];
 216 } Elf_External_Verdaux;
 217
 218 /* This structure appears in a SHT_GNU_verneed section.  */
 219
 220 typedef struct {
 221   unsigned char         vn_version[2];
 222   unsigned char         vn_cnt[2];
 223   unsigned char         vn_file[4];
 224   unsigned char         vn_aux[4];
 225   unsigned char         vn_next[4];
 226 } Elf_External_Verneed;
 227
 228 /* This structure appears in a SHT_GNU_verneed section.  */
 229
 230 typedef struct {
 231   unsigned char         vna_hash[4];
 232   unsigned char         vna_flags[2];
 233   unsigned char         vna_other[2];
 234   unsigned char         vna_name[4];
 235   unsigned char         vna_next[4];
 236 } Elf_External_Vernaux;
 237
 238 /* This structure appears in a SHT_GNU_versym section.  This is not a
 239    standard ELF structure; ELF just uses Elf32_Half.  */
 240
 241 typedef struct {
 242   unsigned char         vs_vers[2];
 243 }
 244 #ifdef __GNUC__
 245   __attribute__ ((packed))
 246 #endif
 247   Elf_External_Versym;
 248
 249 /* Structure for syminfo section.  */
 250 typedef struct
 251 {
 252   unsigned char         si_boundto[2];
 253   unsigned char         si_flags[2];
 254 } Elf_External_Syminfo;
 255
 256 #endif /* _ELF_EXTERNAL_H */