include/elf/common.h

   1 /* ELF support for BFD.
   2    Copyright (C) 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, 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
  31 /* Fields in e_ident[] */
  32
  33 #define EI_MAG0         0               /* File identification byte 0 index */
  34 #define ELFMAG0         0x7F            /* Magic number byte 0 */
  35
  36 #define EI_MAG1         1               /* File identification byte 1 index */
  37 #define ELFMAG1         'E'             /* Magic number byte 1 */
  38
  39 #define EI_MAG2         2               /* File identification byte 2 index */
  40 #define ELFMAG2         'L'             /* Magic number byte 2 */
  41
  42 #define EI_MAG3         3               /* File identification byte 3 index */
  43 #define ELFMAG3         'F'             /* Magic number byte 3 */
  44
  45 #define EI_CLASS        4               /* File class */
  46 #define ELFCLASSNONE    0               /* Invalid class */
  47 #define ELFCLASS32      1               /* 32-bit objects */
  48 #define ELFCLASS64      2               /* 64-bit objects */
  49
  50 #define EI_DATA         5               /* Data encoding */
  51 #define ELFDATANONE     0               /* Invalid data encoding */
  52 #define ELFDATA2LSB     1               /* 2's complement, little endian */
  53 #define ELFDATA2MSB     2               /* 2's complement, big endian */
  54
  55 #define EI_VERSION      6               /* File version */
  56
  57 #define EI_PAD          7               /* Start of padding bytes */
  58
  59
  60 /* Values for e_type, which identifies the object file type */
  61
  62 #define ET_NONE         0               /* No file type */
  63 #define ET_REL          1               /* Relocatable file */
  64 #define ET_EXEC         2               /* Executable file */
  65 #define ET_DYN          3               /* Shared object file */
  66 #define ET_CORE         4               /* Core file */
  67 #define ET_LOPROC       0xFF00          /* Processor-specific */
  68 #define ET_HIPROC       0xFFFF          /* Processor-specific */
  69
  70 /* Values for e_machine, which identifies the architecture */
  71
  72 #define EM_NONE         0               /* No machine */
  73 #define EM_M32          1               /* AT&T WE 32100 */
  74 #define EM_SPARC        2               /* SUN SPARC */
  75 #define EM_386          3               /* Intel 80386 */
  76 #define EM_68K          4               /* Motorola m68k family */
  77 #define EM_88K          5               /* Motorola m88k family */
  78 #define EM_860          7               /* Intel 80860 */
  79 #define EM_MIPS         8               /* MIPS R3000 */
  80
  81 /* Values for e_version */
  82
  83 #define EV_NONE         0               /* Invalid ELF version */
  84 #define EV_CURRENT      1               /* Current version */
  85
  86 /* Values for program header, p_type field */
  87
  88 #define PT_NULL         0               /* Program header table entry unused */
  89 #define PT_LOAD         1               /* Loadable program segment */
  90 #define PT_DYNAMIC      2               /* Dynamic linking information */
  91 #define PT_INTERP       3               /* Program interpreter */
  92 #define PT_NOTE         4               /* Auxiliary information */
  93 #define PT_SHLIB        5               /* Reserved, unspecified semantics */
  94 #define PT_PHDR         6               /* Entry for header table itself */
  95 #define PT_LOPROC       0x70000000      /* Processor-specific */
  96 #define PT_HIPROC       0x7FFFFFFF      /* Processor-specific */
  97
  98 /* Program segment permissions, in program header p_flags field */
  99
 100 #define PF_X            (1 << 0)        /* Segment is executable */
 101 #define PF_W            (1 << 1)        /* Segment is writable */
 102 #define PF_R            (1 << 2)        /* Segment is readable */
 103 #define PF_MASKPROC     0xF0000000      /* Processor-specific reserved bits */
 104
 105 /* Values for section header, sh_type field */
 106
 107 #define SHT_NULL        0               /* Section header table entry unused */
 108 #define SHT_PROGBITS    1               /* Program specific (private) data */
 109 #define SHT_SYMTAB      2               /* Link editing symbol table */
 110 #define SHT_STRTAB      3               /* A string table */
 111 #define SHT_RELA        4               /* Relocation entries with addends */
 112 #define SHT_HASH        5               /* A symbol hash table */
 113 #define SHT_DYNAMIC     6               /* Information for dynamic linking */
 114 #define SHT_NOTE        7               /* Information that marks file */
 115 #define SHT_NOBITS      8               /* Section occupies no space in file */
 116 #define SHT_REL         9               /* Relocation entries, no addends */
 117 #define SHT_SHLIB       10              /* Reserved, unspecified semantics */
 118 #define SHT_DYNSYM      11              /* Dynamic linking symbol table */
 119 #define SHT_BEPROGBITS  12              /* Possibly nonstandard section type
 120                                            for i860 processors operating in big
 121                                            endian mode.  This section is used
 122                                            for code while SHT_PROGBITS is used
 123                                            for data. */
 124 #define SHT_LOPROC      0x70000000      /* Processor-specific semantics, lo */
 125 #define SHT_HIPROC      0x7FFFFFFF      /* Processor-specific semantics, hi */
 126 #define SHT_LOUSER      0x80000000      /* Application-specific semantics */
 127 #define SHT_HIUSER      0x8FFFFFFF      /* Application-specific semantics */
 128
 129 /* Values for section header, sh_flags field */
 130
 131 #define SHF_WRITE       (1 << 0)        /* Writable data during execution */
 132 #define SHF_ALLOC       (1 << 1)        /* Occupies memory during execution */
 133 #define SHF_EXECINSTR   (1 << 2)        /* Executable machine instructions */
 134 #define SHF_MASKPROC    0xF0000000      /* Processor-specific semantics */
 135
 136 /* Values of note segment descriptor types for core files. */
 137
 138 #define NT_PRSTATUS     1               /* Contains copy of prstatus struct */
 139 #define NT_FPREGSET     2               /* Contains copy of fpregset struct */
 140 #define NT_PRPSINFO     3               /* Contains copy of prpsinfo struct */
 141
 142 /* These three macros disassemble and assemble a symbol table st_info field,
 143    which contains the symbol binding and symbol type.  The STB_ and STT_
 144    defines identify the binding and type. */
 145
 146 #define ELF_ST_BIND(val)                (((unsigned int)(val)) >> 4)
 147 #define ELF_ST_TYPE(val)                ((val) & 0xF)
 148 #define ELF_ST_INFO(bind,type)          (((bind) << 4) + ((type) & 0xF))
 149
 150 #define STB_LOCAL       0               /* Symbol not visible outside obj */
 151 #define STB_GLOBAL      1               /* Symbol visible outside obj */
 152 #define STB_WEAK        2               /* Like globals, lower precedence */
 153 #define STB_LOPROC      13              /* Application-specific semantics */
 154 #define STB_HIPROC      15              /* Application-specific semantics */
 155
 156 #define STT_NOTYPE      0               /* Symbol type is unspecified */
 157 #define STT_OBJECT      1               /* Symbol is a data object */
 158 #define STT_FUNC        2               /* Symbol is a code object */
 159 #define STT_SECTION     3               /* Symbol associated with a section */
 160 #define STT_FILE        4               /* Symbol gives a file name */
 161 #define STT_LOPROC      13              /* Application-specific semantics */
 162 #define STT_HIPROC      15              /* Application-specific semantics */
 163
 164 /* Special section indices, which may show up in st_shndx fields, among
 165    other places. */
 166
 167 #define SHN_UNDEF       0               /* Undefined section reference */
 168 #define SHN_LORESERV    0xFF00          /* Begin range of reserved indices */
 169 #define SHN_LOPROC      0xFF00          /* Begin range of appl-specific */
 170 #define SHN_HIPROC      0xFF1F          /* End range of appl-specific */
 171 #define SHN_ABS         0xFFF1          /* Associated symbol is absolute */
 172 #define SHN_COMMON      0xFFF2          /* Associated symbol is in common */
 173 #define SHN_HIRESERVE   0xFFFF          /* End range of reserved indices */
 174
 175 /* relocation info handling macros */
 176
 177 #define ELF_R_SYM(i)    ((i)>>8)
 178 #define ELF_R_TYPE(i)   ((unsigned char)(i))
 179 #define ELF_R_INFO(s,t) (((s)<<8)+(unsigned char)(t))