include/elf/common.h

   1 /* ELF support for BFD.
   2    Copyright (C) 1991, 92, 93, 94, 95, 96, 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
   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 are common to both the internal and external representations.
  27    For example, ELFMAG0 is the byte 0x7F in both the internal (in-memory)
  28    and external (in-file) representations. */
  29
  30 #ifndef _ELF_COMMON_H
  31 #define _ELF_COMMON_H
  32
  33 /* Fields in e_ident[] */
  34
  35 #define EI_MAG0         0               /* File identification byte 0 index */
  36 #define ELFMAG0         0x7F            /* Magic number byte 0 */
  37
  38 #define EI_MAG1         1               /* File identification byte 1 index */
  39 #define ELFMAG1         'E'             /* Magic number byte 1 */
  40
  41 #define EI_MAG2         2               /* File identification byte 2 index */
  42 #define ELFMAG2         'L'             /* Magic number byte 2 */
  43
  44 #define EI_MAG3         3               /* File identification byte 3 index */
  45 #define ELFMAG3         'F'             /* Magic number byte 3 */
  46
  47 #define EI_CLASS        4               /* File class */
  48 #define ELFCLASSNONE    0               /* Invalid class */
  49 #define ELFCLASS32      1               /* 32-bit objects */
  50 #define ELFCLASS64      2               /* 64-bit objects */
  51
  52 #define EI_DATA         5               /* Data encoding */
  53 #define ELFDATANONE     0               /* Invalid data encoding */
  54 #define ELFDATA2LSB     1               /* 2's complement, little endian */
  55 #define ELFDATA2MSB     2               /* 2's complement, big endian */
  56
  57 #define EI_VERSION      6               /* File version */
  58
  59 #define EI_PAD          7               /* Start of padding bytes */
  60
  61
  62 /* Values for e_type, which identifies the object file type */
  63
  64 #define ET_NONE         0               /* No file type */
  65 #define ET_REL          1               /* Relocatable file */
  66 #define ET_EXEC         2               /* Executable file */
  67 #define ET_DYN          3               /* Shared object file */
  68 #define ET_CORE         4               /* Core file */
  69 #define ET_LOPROC       0xFF00          /* Processor-specific */
  70 #define ET_HIPROC       0xFFFF          /* Processor-specific */
  71
  72 /* Values for e_machine, which identifies the architecture */
  73
  74 #define EM_NONE         0       /* No machine */
  75 #define EM_M32          1       /* AT&T WE 32100 */
  76 #define EM_SPARC        2       /* SUN SPARC */
  77 #define EM_386          3       /* Intel 80386 */
  78 #define EM_68K          4       /* Motorola m68k family */
  79 #define EM_88K          5       /* Motorola m88k family */
  80 #define EM_860          7       /* Intel 80860 */
  81 #define EM_MIPS         8       /* MIPS R3000 (officially, big-endian only) */
  82
  83 #define EM_MIPS_RS4_BE 10       /* MIPS R4000 big-endian */
  84
  85 #define EM_SPARC64     11       /* SPARC v9 (not official) 64-bit */
  86
  87 #define EM_PARISC      15       /* HPPA */
  88
  89 #define EM_SPARC32PLUS 18       /* Sun's "v8plus" */
  90
  91 #define EM_PPC         20       /* PowerPC */
  92
  93 #define EM_SH          42       /* Hitachi SH */
  94
  95 /* If it is necessary to assign new unofficial EM_* values, please pick large
  96    random numbers (0x8523, 0xa7f2, etc.) to minimize the chances of collision
  97    with official or non-GNU unofficial values.
  98
  99    NOTE: Do not just increment the most recent number by one.
 100    Somebody else somewhere will do exactly the same thing, and you
 101    will have a collision.  Instead, pick a random number.  */
 102
 103 /* Cygnus PowerPC ELF backend.  Written in the absence of an ABI.  */
 104 #define EM_CYGNUS_POWERPC 0x9025
 105
 106 /* Old version of PowerPC, this should be removed shortly. */
 107 #define EM_PPC_OLD      17
 108
 109 /* Cygnus ARC ELF backend.  Written in the absence of an ABI.  */
 110 #define EM_CYGNUS_ARC 0x9040
 111
 112 /* Cygnus M32R ELF backend.  Written in the absence of an ABI.  */
 113 #define EM_CYGNUS_M32R 0x9041
 114
 115 /* Alpha backend magic number.  Written in the absence of an ABI.  */
 116 #define EM_ALPHA        0x9026
 117
 118 /* D10V backend magic number.  Written in the absence of an ABI.  */
 119 #define EM_CYGNUS_D10V  0x7650
 120
 121 /* start-sanitize-d30v */
 122 /* D30V backend magic number.  Written in the absence of an ABI.  */
 123 #define EM_CYGNUS_D30V  0x7676
 124 /* end-sanitize-d30v */
 125
 126 /* start-sanitize-v850 */
 127 /* V850 backend magic number.  Written in the absense of an ABI.  */
 128 #define EM_CYGNUS_V850  0x9080
 129 /* end-sanitize-v850 */
 130
 131 /* mn10200 and mn10300 backend magic numbers.
 132    Written in the absense of an ABI.  */
 133 #define EM_CYGNUS_MN10200       0xdead
 134 #define EM_CYGNUS_MN10300       0xbeef
 135
 136 /* See the above comment before you add a new EM_* value here.  */
 137
 138 /* Values for e_version */
 139
 140 #define EV_NONE         0               /* Invalid ELF version */
 141 #define EV_CURRENT      1               /* Current version */
 142
 143 /* Values for program header, p_type field */
 144
 145 #define PT_NULL         0               /* Program header table entry unused */
 146 #define PT_LOAD         1               /* Loadable program segment */
 147 #define PT_DYNAMIC      2               /* Dynamic linking information */
 148 #define PT_INTERP       3               /* Program interpreter */
 149 #define PT_NOTE         4               /* Auxiliary information */
 150 #define PT_SHLIB        5               /* Reserved, unspecified semantics */
 151 #define PT_PHDR         6               /* Entry for header table itself */
 152 #define PT_LOPROC       0x70000000      /* Processor-specific */
 153 #define PT_HIPROC       0x7FFFFFFF      /* Processor-specific */
 154
 155 /* Program segment permissions, in program header p_flags field */
 156
 157 #define PF_X            (1 << 0)        /* Segment is executable */
 158 #define PF_W            (1 << 1)        /* Segment is writable */
 159 #define PF_R            (1 << 2)        /* Segment is readable */
 160 #define PF_MASKPROC     0xF0000000      /* Processor-specific reserved bits */
 161
 162 /* Values for section header, sh_type field */
 163
 164 #define SHT_NULL        0               /* Section header table entry unused */
 165 #define SHT_PROGBITS    1               /* Program specific (private) data */
 166 #define SHT_SYMTAB      2               /* Link editing symbol table */
 167 #define SHT_STRTAB      3               /* A string table */
 168 #define SHT_RELA        4               /* Relocation entries with addends */
 169 #define SHT_HASH        5               /* A symbol hash table */
 170 #define SHT_DYNAMIC     6               /* Information for dynamic linking */
 171 #define SHT_NOTE        7               /* Information that marks file */
 172 #define SHT_NOBITS      8               /* Section occupies no space in file */
 173 #define SHT_REL         9               /* Relocation entries, no addends */
 174 #define SHT_SHLIB       10              /* Reserved, unspecified semantics */
 175 #define SHT_DYNSYM      11              /* Dynamic linking symbol table */
 176
 177 /* The next three section types are defined by Solaris, and are named
 178    SHT_SUNW*.  We use them in GNU code, so we also define SHT_GNU*
 179    versions.  */
 180 #define SHT_SUNW_verdef 0x6ffffffd      /* Versions defined by file */
 181 #define SHT_SUNW_verneed 0x6ffffffe     /* Versions needed by file */
 182 #define SHT_SUNW_versym 0x6fffffff      /* Symbol versions */
 183
 184 #define SHT_GNU_verdef  SHT_SUNW_verdef
 185 #define SHT_GNU_verneed SHT_SUNW_verneed
 186 #define SHT_GNU_versym  SHT_SUNW_versym
 187
 188 #define SHT_LOPROC      0x70000000      /* Processor-specific semantics, lo */
 189 #define SHT_HIPROC      0x7FFFFFFF      /* Processor-specific semantics, hi */
 190 #define SHT_LOUSER      0x80000000      /* Application-specific semantics */
 191 #define SHT_HIUSER      0x8FFFFFFF      /* Application-specific semantics */
 192
 193 /* Values for section header, sh_flags field */
 194
 195 #define SHF_WRITE       (1 << 0)        /* Writable data during execution */
 196 #define SHF_ALLOC       (1 << 1)        /* Occupies memory during execution */
 197 #define SHF_EXECINSTR   (1 << 2)        /* Executable machine instructions */
 198 #define SHF_MASKPROC    0xF0000000      /* Processor-specific semantics */
 199
 200 /* Values of note segment descriptor types for core files. */
 201
 202 #define NT_PRSTATUS     1               /* Contains copy of prstatus struct */
 203 #define NT_FPREGSET     2               /* Contains copy of fpregset struct */
 204 #define NT_PRPSINFO     3               /* Contains copy of prpsinfo struct */
 205
 206 /* Values of note segment descriptor types for object files.  */
 207 /* (Only for hppa right now.  Should this be moved elsewhere?)  */
 208
 209 #define NT_VERSION      1               /* Contains a version string.  */
 210
 211 /* These three macros disassemble and assemble a symbol table st_info field,
 212    which contains the symbol binding and symbol type.  The STB_ and STT_
 213    defines identify the binding and type. */
 214
 215 #define ELF_ST_BIND(val)                (((unsigned int)(val)) >> 4)
 216 #define ELF_ST_TYPE(val)                ((val) & 0xF)
 217 #define ELF_ST_INFO(bind,type)          (((bind) << 4) + ((type) & 0xF))
 218
 219 #define STN_UNDEF       0               /* undefined symbol index */
 220
 221 #define STB_LOCAL       0               /* Symbol not visible outside obj */
 222 #define STB_GLOBAL      1               /* Symbol visible outside obj */
 223 #define STB_WEAK        2               /* Like globals, lower precedence */
 224 #define STB_LOPROC      13              /* Application-specific semantics */
 225 #define STB_HIPROC      15              /* Application-specific semantics */
 226
 227 #define STT_NOTYPE      0               /* Symbol type is unspecified */
 228 #define STT_OBJECT      1               /* Symbol is a data object */
 229 #define STT_FUNC        2               /* Symbol is a code object */
 230 #define STT_SECTION     3               /* Symbol associated with a section */
 231 #define STT_FILE        4               /* Symbol gives a file name */
 232 #define STT_LOPROC      13              /* Application-specific semantics */
 233 #define STT_HIPROC      15              /* Application-specific semantics */
 234
 235 /* Special section indices, which may show up in st_shndx fields, among
 236    other places. */
 237
 238 #define SHN_UNDEF       0               /* Undefined section reference */
 239 #define SHN_LORESERVE   0xFF00          /* Begin range of reserved indices */
 240 #define SHN_LOPROC      0xFF00          /* Begin range of appl-specific */
 241 #define SHN_HIPROC      0xFF1F          /* End range of appl-specific */
 242 #define SHN_ABS         0xFFF1          /* Associated symbol is absolute */
 243 #define SHN_COMMON      0xFFF2          /* Associated symbol is in common */
 244 #define SHN_HIRESERVE   0xFFFF          /* End range of reserved indices */
 245
 246 /* relocation info handling macros */
 247
 248 #define ELF32_R_SYM(i)          ((i) >> 8)
 249 #define ELF32_R_TYPE(i)         ((i) & 0xff)
 250 #define ELF32_R_INFO(s,t)       (((s) << 8) + ((t) & 0xff))
 251
 252 #define ELF64_R_SYM(i)          ((i) >> 32)
 253 #define ELF64_R_TYPE(i)         ((i) & 0xffffffff)
 254 #define ELF64_R_INFO(s,t)       (((bfd_vma) (s) << 32) + (bfd_vma) (t))
 255
 256 /* Dynamic section tags */
 257
 258 #define DT_NULL         0
 259 #define DT_NEEDED       1
 260 #define DT_PLTRELSZ     2
 261 #define DT_PLTGOT       3
 262 #define DT_HASH         4
 263 #define DT_STRTAB       5
 264 #define DT_SYMTAB       6
 265 #define DT_RELA         7
 266 #define DT_RELASZ       8
 267 #define DT_RELAENT      9
 268 #define DT_STRSZ        10
 269 #define DT_SYMENT       11
 270 #define DT_INIT         12
 271 #define DT_FINI         13
 272 #define DT_SONAME       14
 273 #define DT_RPATH        15
 274 #define DT_SYMBOLIC     16
 275 #define DT_REL          17
 276 #define DT_RELSZ        18
 277 #define DT_RELENT       19
 278 #define DT_PLTREL       20
 279 #define DT_DEBUG        21
 280 #define DT_TEXTREL      22
 281 #define DT_JMPREL       23
 282
 283 /* The next four dynamic tags are used on Solaris.  We support them
 284    everywhere.  */
 285 #define DT_VERDEF       0x6ffffffc
 286 #define DT_VERDEFNUM    0x6ffffffd
 287 #define DT_VERNEED      0x6ffffffe
 288 #define DT_VERNEEDNUM   0x6fffffff
 289
 290 /* This tag is a GNU extension to the Solaris version scheme.  */
 291 #define DT_VERSYM       0x6ffffff0
 292
 293 #define DT_LOPROC       0x70000000
 294 #define DT_HIPROC       0x7fffffff
 295
 296 /* These section tags are used on Solaris.  We support them
 297    everywhere, and hope they do not conflict.  */
 298
 299 #define DT_AUXILIARY    0x7ffffffd
 300 #define DT_FILTER       0x7fffffff
 301
 302 /* These constants are used for the version number of a Elf32_Verdef
 303    structure.  */
 304
 305 #define VER_DEF_NONE            0
 306 #define VER_DEF_CURRENT         1
 307
 308 /* These constants appear in the vd_flags field of a Elf32_Verdef
 309    structure.  */
 310
 311 #define VER_FLG_BASE            0x1
 312 #define VER_FLG_WEAK            0x2
 313
 314 /* These special constants can be found in an Elf32_Versym field.  */
 315
 316 #define VER_NDX_LOCAL           0
 317 #define VER_NDX_GLOBAL          1
 318
 319 /* These constants are used for the version number of a Elf32_Verneed
 320    structure.  */
 321
 322 #define VER_NEED_NONE           0
 323 #define VER_NEED_CURRENT        1
 324
 325 /* This flag appears in a Versym structure.  It means that the symbol
 326    is hidden, and is only visible with an explicit version number.
 327    This is a GNU extension.  */
 328
 329 #define VERSYM_HIDDEN           0x8000
 330
 331 /* This is the mask for the rest of the Versym information.  */
 332
 333 #define VERSYM_VERSION          0x7fff
 334
 335 /* This is a special token which appears as part of a symbol name.  It
 336    indictes that the rest of the name is actually the name of a
 337    version node, and is not part of the actual name.  This is a GNU
 338    extension.  For example, the symbol name `stat@ver2' is taken to
 339    mean the symbol `stat' in version `ver2'.  */
 340
 341 #define ELF_VER_CHR     '@'
 342
 343 #endif /* _ELF_COMMON_H */