include/elf/internal.h

   1 /* ELF support for BFD.
   2    Copyright (C) 1991, 92, 93, 94, 95, 97, 1998 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 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
  43 typedef 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
  67 struct 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
  78 typedef 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
  86 typedef 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
 110 struct 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
 119 typedef 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
 128 typedef 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 *        namedata;               /* Start of the name+desc data */
 133   char *        descdata;               /* Start of the desc data */
 134   bfd_vma       descpos;                /* File offset of the descdata */
 135 } Elf_Internal_Note;
 136 #define Elf32_Internal_Note     Elf_Internal_Note
 137 #define elf32_internal_note     elf_internal_note
 138
 139 /* Relocation Entries */
 140
 141 typedef struct elf_internal_rel {
 142   bfd_vma       r_offset;       /* Location at which to apply the action */
 143   /* This needs to support 64-bit values in elf64.  */
 144   bfd_vma       r_info;         /* index and type of relocation */
 145 } Elf_Internal_Rel;
 146
 147 #define elf32_internal_rel elf_internal_rel
 148 #define Elf32_Internal_Rel Elf_Internal_Rel
 149 #define elf64_internal_rel elf_internal_rel
 150 #define Elf64_Internal_Rel Elf_Internal_Rel
 151
 152 typedef struct elf_internal_rela {
 153   bfd_vma       r_offset;       /* Location at which to apply the action */
 154   bfd_vma       r_info;         /* Index and Type of relocation */
 155   bfd_signed_vma r_addend;      /* Constant addend used to compute value */
 156 } Elf_Internal_Rela;
 157
 158 #define elf32_internal_rela elf_internal_rela
 159 #define elf64_internal_rela elf_internal_rela
 160 #define Elf32_Internal_Rela Elf_Internal_Rela
 161 #define Elf64_Internal_Rela Elf_Internal_Rela
 162
 163 /* dynamic section structure */
 164
 165 typedef struct elf_internal_dyn {
 166   /* This needs to support 64-bit values in elf64.  */
 167   bfd_vma d_tag;                /* entry tag value */
 168   union {
 169     /* This needs to support 64-bit values in elf64.  */
 170     bfd_vma     d_val;
 171     bfd_vma     d_ptr;
 172   } d_un;
 173 } Elf_Internal_Dyn;
 174
 175 #define elf32_internal_dyn elf_internal_dyn
 176 #define elf64_internal_dyn elf_internal_dyn
 177 #define Elf32_Internal_Dyn Elf_Internal_Dyn
 178 #define Elf64_Internal_Dyn Elf_Internal_Dyn
 179
 180 /* This structure appears in a SHT_GNU_verdef section.  */
 181
 182 typedef struct elf_internal_verdef {
 183   unsigned short vd_version;    /* Version number of structure.  */
 184   unsigned short vd_flags;      /* Flags (VER_FLG_*).  */
 185   unsigned short vd_ndx;        /* Version index.  */
 186   unsigned short vd_cnt;        /* Number of verdaux entries.  */
 187   unsigned long  vd_hash;       /* Hash of name.  */
 188   unsigned long  vd_aux;        /* Offset to verdaux entries.  */
 189   unsigned long  vd_next;       /* Offset to next verdef.  */
 190
 191   /* These fields are set up when BFD reads in the structure.  FIXME:
 192      It would be cleaner to store these in a different structure.  */
 193   bfd                         *vd_bfd;          /* BFD.  */
 194   const char                  *vd_nodename;     /* Version name.  */
 195   struct elf_internal_verdef  *vd_nextdef;      /* vd_next as pointer.  */
 196   struct elf_internal_verdaux *vd_auxptr;       /* vd_aux as pointer.  */
 197   unsigned int                 vd_exp_refno;    /* Used by the linker.  */
 198 } Elf_Internal_Verdef;
 199
 200 /* This structure appears in a SHT_GNU_verdef section.  */
 201
 202 typedef struct elf_internal_verdaux {
 203   unsigned long vda_name;       /* String table offset of name.  */
 204   unsigned long vda_next;       /* Offset to next verdaux.  */
 205
 206   /* These fields are set up when BFD reads in the structure.  FIXME:
 207      It would be cleaner to store these in a different structure.  */
 208   const char *vda_nodename;                     /* vda_name as pointer.  */
 209   struct elf_internal_verdaux *vda_nextptr;     /* vda_next as pointer.  */
 210 } Elf_Internal_Verdaux;
 211
 212 /* This structure appears in a SHT_GNU_verneed section.  */
 213
 214 typedef struct elf_internal_verneed {
 215   unsigned short vn_version;    /* Version number of structure.  */
 216   unsigned short vn_cnt;        /* Number of vernaux entries.  */
 217   unsigned long  vn_file;       /* String table offset of library name.  */
 218   unsigned long  vn_aux;        /* Offset to vernaux entries.  */
 219   unsigned long  vn_next;       /* Offset to next verneed.  */
 220
 221   /* These fields are set up when BFD reads in the structure.  FIXME:
 222      It would be cleaner to store these in a different structure.  */
 223   bfd                         *vn_bfd;          /* BFD.  */
 224   const char                  *vn_filename;     /* vn_file as pointer.  */
 225   struct elf_internal_vernaux *vn_auxptr;       /* vn_aux as pointer.  */
 226   struct elf_internal_verneed *vn_nextref;      /* vn_nextref as pointer.  */
 227 } Elf_Internal_Verneed;
 228
 229 /* This structure appears in a SHT_GNU_verneed section.  */
 230
 231 typedef struct elf_internal_vernaux {
 232   unsigned long  vna_hash;      /* Hash of dependency name.  */
 233   unsigned short vna_flags;     /* Flags (VER_FLG_*).  */
 234   unsigned short vna_other;     /* Unused.  */
 235   unsigned long  vna_name;      /* String table offset to version name.  */
 236   unsigned long  vna_next;      /* Offset to next vernaux.  */
 237
 238   /* These fields are set up when BFD reads in the structure.  FIXME:
 239      It would be cleaner to store these in a different structure.  */
 240   const char                  *vna_nodename;    /* vna_name as pointer.  */
 241   struct elf_internal_vernaux *vna_nextptr;     /* vna_next as pointer.  */
 242 } Elf_Internal_Vernaux;
 243
 244 /* This structure appears in a SHT_GNU_versym section.  This is not a
 245    standard ELF structure; ELF just uses Elf32_Half.  */
 246
 247 typedef struct elf_internal_versym {
 248   unsigned short vs_vers;
 249 } Elf_Internal_Versym;
 250
 251 /* Structure for syminfo section.  */
 252 typedef struct
 253 {
 254   unsigned short int    si_boundto;
 255   unsigned short int    si_flags;
 256 } Elf_Internal_Syminfo;
 257
 258
 259 #define elf32_internal_verdef elf_internal_verdef
 260 #define elf64_internal_verdef elf_internal_verdef
 261 #define elf32_internal_verdaux elf_internal_verdaux
 262 #define elf64_internal_verdaux elf_internal_verdaux
 263 #define elf32_internal_verneed elf_internal_verneed
 264 #define elf64_internal_verneed elf_internal_verneed
 265 #define elf32_internal_vernaux elf_internal_vernaux
 266 #define elf64_internal_vernaux elf_internal_vernaux
 267 #define elf32_internal_versym elf_internal_versym
 268 #define elf64_internal_versym elf_internal_versym
 269
 270 #define Elf32_Internal_Verdef Elf_Internal_Verdef
 271 #define Elf64_Internal_Verdef Elf_Internal_Verdef
 272 #define Elf32_Internal_Verdaux Elf_Internal_Verdaux
 273 #define Elf64_Internal_Verdaux Elf_Internal_Verdaux
 274 #define Elf32_Internal_Verneed Elf_Internal_Verneed
 275 #define Elf64_Internal_Verneed Elf_Internal_Verneed
 276 #define Elf32_Internal_Vernaux Elf_Internal_Vernaux
 277 #define Elf64_Internal_Vernaux Elf_Internal_Vernaux
 278 #define Elf32_Internal_Versym Elf_Internal_Versym
 279 #define Elf64_Internal_Versym Elf_Internal_Versym
 280 #define Elf32_Internal_Syminfo Elf_Internal_Syminfo
 281 #define Elf64_Internal_Syminfo Elf_Internal_Syminfo
 282
 283 /* This structure is used to describe how sections should be assigned
 284    to program segments.  */
 285
 286 struct elf_segment_map
 287 {
 288   /* Next program segment.  */
 289   struct elf_segment_map *next;
 290   /* Program segment type.  */
 291   unsigned long p_type;
 292   /* Program segment flags.  */
 293   unsigned long p_flags;
 294   /* Program segment physical address.  */
 295   bfd_vma p_paddr;
 296   /* Whether the p_flags field is valid; if not, the flags are based
 297      on the section flags.  */
 298   unsigned int p_flags_valid : 1;
 299   /* Whether the p_paddr field is valid; if not, the physical address
 300      is based on the section lma values.  */
 301   unsigned int p_paddr_valid : 1;
 302   /* Whether this segment includes the file header.  */
 303   unsigned int includes_filehdr : 1;
 304   /* Whether this segment includes the program headers.  */
 305   unsigned int includes_phdrs : 1;
 306   /* Number of sections (may be 0).  */
 307   unsigned int count;
 308   /* Sections.  Actual number of elements is in count field.  */
 309   asection *sections[1];
 310 };
 311
 312 #endif /* _ELF_INTERNAL_H */