include/elf.h

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32
  33 /* @file
  34  *
  35  * Minimal ELF header declaration / constants.  Only Elf32* values are
  36  * handled, and constants are defined only for fields that are actualy
  37  * used.  (Unused constants for used fields are include only for
  38  * "completeness", though of course in many cases there are more
  39  * values in use, e.g., the EM_* values for e_machine.)
  40  *
  41  * (Re)Created from the ELF specification at
  42  * http://x86.ddj.com/ftp/manuals/tools/elf.pdf which is referenced
  43  * from wikipedia article
  44  * http://en.wikipedia.org/wki/Executable_and_Linkable_Format
  45  */
  46
  47 #ifndef NATIVE_CLIENT_INCLUDE_ELF_H_
  48 #define NATIVE_CLIENT_INCLUDE_ELF_H_
  49
  50 #include "native_client/include/nacl_base.h"
  51
  52 EXTERN_C_BEGIN
  53
  54 /*
  55  * Note that we must compile on windows, where stdint.h may be unavailable.
  56  */
  57
  58 /* assumes 32-bit int, 16-bit short, 8-bit char */
  59
  60 typedef unsigned int    Elf32_Addr;   /* alignment 4 */
  61 typedef unsigned short  Elf32_Half;   /* alignment 2 */
  62 typedef unsigned int    Elf32_Off;    /* alignment 4 */
  63 typedef int             Elf32_Sword;  /* alignment 4 */
  64 typedef unsigned int    Elf32_Word;   /* alignment 4 */
  65 /* unsigned char, size 1, alignment 1 */
  66
  67 #define EI_NIDENT       16   /* fwd, see rest of EI_* below */
  68
  69 typedef struct {
  70   unsigned char e_ident[EI_NIDENT];
  71   Elf32_Half    e_type;
  72   Elf32_Half    e_machine;
  73   Elf32_Word    e_version;
  74   Elf32_Addr    e_entry;
  75   Elf32_Off     e_phoff;
  76   Elf32_Off     e_shoff;
  77   Elf32_Word    e_flags;
  78   Elf32_Half    e_ehsize;
  79   Elf32_Half    e_phentsize;
  80   Elf32_Half    e_phnum;
  81   Elf32_Half    e_shentsize;
  82   Elf32_Half    e_shnum;
  83   Elf32_Half    e_shstrndx;
  84 } Elf32_Ehdr;
  85
  86 #define ET_NONE         0   /* no file type */
  87 #define ET_REL          1   /* relocatable file */
  88 #define ET_EXEC         2   /* executable file */
  89 #define ET_DYN          3   /* shared object file */
  90 #define ET_CORE         4   /* core file */
  91 #define ET_LOPROC  0xff00   /* processor-specific */
  92 #define ET_HIPROC  0xffff   /* processor-specific */
  93
  94 #define EM_NONE         0   /* no machine */
  95 #define EM_M32          1   /* at&t we 32100 */
  96 #define EM_SPARC        2   /* sparc */
  97 #define EM_386          3   /* intel architecture */
  98 #define EM_68K          4   /* motorola 68000 */
  99 #define EM_88K          5   /* motorola 88000 */
 100 #define EM_860          7   /* intel 80860 */
 101 #define EM_MIPS         9   /* mips rs3000 big-endian */
 102 #define EM_MIPS_RS4_BE  10  /* mips rs4000 big-endian */
 103 #define EM_LORESERVED   11
 104 #define EM_HIRESERVED   16
 105
 106 #define EV_NONE         0   /* invalid version */
 107 #define EV_CURRENT      1   /* current version */
 108
 109 #define EI_MAG0         0   /* file identification */
 110 #define EI_MAG1         1   /* file identification */
 111 #define EI_MAG2         2   /* file identification */
 112 #define EI_MAG3         3   /* file identification */
 113 #define EI_CLASS        4   /* file class */
 114 #define EI_DATA         5   /* data encoding */
 115 #define EI_VERSION      6   /* file version */
 116 /*
 117  * EI_PAD deviates from the pdf specification, where its value is 7, since
 118  * EI_OSABI and EI_ABIVERSION have been introduced.  EI_OSABI and
 119  * EI_OSABIVERSION are from linux elf.h for code usage compatibility.
 120  */
 121 #define EI_PAD          9   /* start of padding bytes */
 122
 123 #define EI_OSABI        7
 124 #define EI_ABIVERSION   8
 125
 126 /*
 127  * ELFMAG and SELFMAG are names/values from linux elf.h, for code usage
 128  * compatibility.
 129  */
 130 #define ELFMAG          "\177ELF"
 131 #define SELFMAG         4
 132
 133 /* EI_CLASS values */
 134 #define ELFCLASSNONE    0
 135 #define ELFCLASS32      1
 136 #define ELFCLASS64      2
 137
 138 /* EI_DATA values */
 139 #define ELFDATANONE     0
 140 #define ELFDATA2LSB     1
 141 #define ELFDATA2MSB     2
 142
 143 typedef struct {
 144   Elf32_Word    p_type;
 145   Elf32_Off     p_offset;
 146   Elf32_Addr    p_vaddr;
 147   Elf32_Addr    p_paddr;
 148   Elf32_Word    p_filesz;
 149   Elf32_Word    p_memsz;
 150   Elf32_Word    p_flags;
 151   Elf32_Word    p_align;
 152 } Elf32_Phdr;
 153
 154 #define PT_NULL       0
 155 #define PT_LOAD       1
 156 #define PT_DYNAMIC    2
 157 #define PT_INTERP     3
 158 #define PT_NOTE       4
 159 #define PT_SHLIB      5
 160 #define PT_PHDR       6
 161 #define PT_LOPROC     0x70000000
 162 #define PT_HIPROC     0x7fffffff
 163 /*
 164  * PT_TLS and PT_GNU_STACK are from linux elf.h, for code usage
 165  * compatibility.
 166  */
 167 #define PT_TLS        7
 168 #define PT_GNU_STACK  0x6474e551
 169
 170 #define PF_X          1
 171 #define PF_W          2
 172 #define PF_R          4
 173 /*
 174  * PF_MASKOS is from linux elf.h, for code usage compatibility
 175  */
 176 #define PF_MASKOS     0x0ff00000  /* os specific */
 177
 178 /*
 179  * ncfileutil wants section headers, even though service runtime does
 180  * not.
 181  */
 182
 183 typedef struct {
 184   Elf32_Word  sh_name;
 185   Elf32_Word  sh_type;
 186   Elf32_Word  sh_flags;
 187   Elf32_Addr  sh_addr;
 188   Elf32_Off   sh_offset;
 189   Elf32_Word  sh_size;
 190   Elf32_Word  sh_link;
 191   Elf32_Word  sh_info;
 192   Elf32_Word  sh_addralign;
 193   Elf32_Word  sh_entsize;
 194 } Elf32_Shdr;
 195
 196 #define SHF_WRITE       0x1
 197 #define SHF_ALLOC       0x2
 198 #define SHF_EXECINSTR   0x4
 199 #define SHF_MASKPROC    0xf0000000
 200
 201 EXTERN_C_END
 202
 203 #endif  /* NATIVE_CLIENT_INCLUDE_ELF_H_ */