output/elf32.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 #ifndef OUTPUT_ELF32_H
  35 #define OUTPUT_ELF32_H
  36
  37 #include "output/elfcommon.h"
  38
  39 /* ELF standard typedefs (yet more proof that <stdint.h> was way overdue) */
  40 typedef uint16_t Elf32_Half;
  41 typedef int16_t Elf32_SHalf;
  42 typedef uint32_t Elf32_Word;
  43 typedef int32_t Elf32_Sword;
  44 typedef uint64_t Elf32_Xword;
  45 typedef int64_t Elf32_Sxword;
  46
  47 typedef uint32_t Elf32_Off;
  48 typedef uint32_t Elf32_Addr;
  49 typedef uint16_t Elf32_Section;
  50
  51 /* Dynamic header */
  52
  53 typedef struct elf32_dyn {
  54     Elf32_Sword d_tag;
  55     union {
  56         Elf32_Sword d_val;
  57         Elf32_Addr d_ptr;
  58     } d_un;
  59 } Elf32_Dyn;
  60
  61 /* Relocations */
  62
  63 #define ELF32_R_SYM(x)  ((x) >> 8)
  64 #define ELF32_R_TYPE(x) ((x) & 0xff)
  65
  66 typedef struct elf32_rel {
  67     Elf32_Addr r_offset;
  68     Elf32_Word r_info;
  69 } Elf32_Rel;
  70
  71 typedef struct elf32_rela {
  72     Elf32_Addr r_offset;
  73     Elf32_Word r_info;
  74     Elf32_Sword r_addend;
  75 } Elf32_Rela;
  76
  77 enum reloc32_type {
  78     R_386_32            =  1,   /* ordinary absolute relocation */
  79     R_386_PC32          =  2,   /* PC-relative relocation */
  80     R_386_GOT32         =  3,   /* an offset into GOT */
  81     R_386_PLT32         =  4,   /* a PC-relative offset into PLT */
  82     R_386_COPY          =  5,   /* ??? */
  83     R_386_GLOB_DAT      =  6,   /* ??? */
  84     R_386_JUMP_SLOT     =  7,   /* ??? */
  85     R_386_RELATIVE      =  8,   /* ??? */
  86     R_386_GOTOFF        =  9,   /* an offset from GOT base */
  87     R_386_GOTPC         = 10,   /* a PC-relative offset _to_ GOT */
  88     R_386_TLS_TPOFF     = 14,   /* Offset in static TLS block */
  89     R_386_TLS_IE        = 15,   /* Address of GOT entry for static TLS
  90                                    block offset */
  91     /* These are GNU extensions, but useful */
  92     R_386_16            = 20,   /* A 16-bit absolute relocation */
  93     R_386_PC16          = 21,   /* A 16-bit PC-relative relocation */
  94     R_386_8             = 22,   /* An 8-bit absolute relocation */
  95     R_386_PC8           = 23    /* An 8-bit PC-relative relocation */
  96 };
  97
  98 /* Symbol */
  99
 100 typedef struct elf32_sym {
 101     Elf32_Word st_name;
 102     Elf32_Addr st_value;
 103     Elf32_Word st_size;
 104     unsigned char st_info;
 105     unsigned char st_other;
 106     Elf32_Half st_shndx;
 107 } Elf32_Sym;
 108
 109 /* Main file header */
 110
 111 typedef struct elf32_hdr {
 112     unsigned char e_ident[EI_NIDENT];
 113     Elf32_Half e_type;
 114     Elf32_Half e_machine;
 115     Elf32_Word e_version;
 116     Elf32_Addr e_entry;
 117     Elf32_Off e_phoff;
 118     Elf32_Off e_shoff;
 119     Elf32_Word e_flags;
 120     Elf32_Half e_ehsize;
 121     Elf32_Half e_phentsize;
 122     Elf32_Half e_phnum;
 123     Elf32_Half e_shentsize;
 124     Elf32_Half e_shnum;
 125     Elf32_Half e_shstrndx;
 126 } Elf32_Ehdr;
 127
 128 /* Program header */
 129
 130 typedef struct elf32_phdr {
 131     Elf32_Word p_type;
 132     Elf32_Off p_offset;
 133     Elf32_Addr p_vaddr;
 134     Elf32_Addr p_paddr;
 135     Elf32_Word p_filesz;
 136     Elf32_Word p_memsz;
 137     Elf32_Word p_flags;
 138     Elf32_Word p_align;
 139 } Elf32_Phdr;
 140
 141 /* Section header */
 142
 143 typedef struct elf32_shdr {
 144     Elf32_Word sh_name;
 145     Elf32_Word sh_type;
 146     Elf32_Word sh_flags;
 147     Elf32_Addr sh_addr;
 148     Elf32_Off sh_offset;
 149     Elf32_Word sh_size;
 150     Elf32_Word sh_link;
 151     Elf32_Word sh_info;
 152     Elf32_Word sh_addralign;
 153     Elf32_Word sh_entsize;
 154 } Elf32_Shdr;
 155
 156 /* Note header */
 157 typedef struct elf32_note {
 158     Elf32_Word n_namesz;        /* Name size */
 159     Elf32_Word n_descsz;        /* Content size */
 160     Elf32_Word n_type;  /* Content type */
 161 } Elf32_Nhdr;
 162
 163 /* How to extract and insert information held in the st_info field.  */
 164 #define ELF32_ST_BIND(val)              (((unsigned char) (val)) >> 4)
 165 #define ELF32_ST_TYPE(val)              ((val) & 0xf)
 166
 167 #endif  /* OUTPUT_ELF32_H */