include/elf/internal.h

   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 short        e_ehsize;       /* ELF header size in bytes */
  54   unsigned short        e_phentsize;    /* Program header table entry size */
  55   unsigned short        e_phnum;        /* Program header table entry count */
  56   unsigned short        e_shentsize;    /* Section header table entry size */
  57   unsigned short        e_shnum;        /* Section header table entry count */
  58   unsigned short        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 short 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 */