src/tools/elfsymbolpatcher/Elf.h

   1 // Elf.h
   2
   3 #ifndef _ELF_H
   4 #define _ELF_H
   5
   6 // types
   7 typedef uint32          Elf32_Addr;
   8 typedef uint16          Elf32_Half;
   9 typedef uint32          Elf32_Off;
  10 typedef int32           Elf32_Sword;
  11 typedef uint32          Elf32_Word;
  12
  13 // e_ident indices
  14 #define EI_MAG0         0
  15 #define EI_MAG1         1
  16 #define EI_MAG2         2
  17 #define EI_MAG3         3
  18 #define EI_CLASS        4
  19 #define EI_DATA         5
  20 #define EI_VERSION      6
  21 #define EI_PAD          7
  22 #define EI_NIDENT       16
  23
  24 // ELF magic
  25 #define ELFMAG0         0x7f
  26 #define ELFMAG1         'E'
  27 #define ELFMAG2         'L'
  28 #define ELFMAG3         'F'
  29
  30 // class
  31 #define ELFCLASSNONE    0
  32 #define ELFCLASS32              1
  33 #define ELFCLASS64              2
  34
  35 // version
  36 #define EV_NONE                 0
  37 #define EV_CURRENT              1
  38
  39 // object file header
  40 typedef struct {
  41         unsigned char   e_ident[EI_NIDENT];
  42         Elf32_Half              e_type;
  43         Elf32_Half              e_machine;
  44         Elf32_Word              e_version;
  45         Elf32_Addr              e_entry;
  46         Elf32_Off               e_phoff;
  47         Elf32_Off               e_shoff;
  48         Elf32_Word              e_flags;
  49         Elf32_Half              e_ehsize;
  50         Elf32_Half              e_phentsize;
  51         Elf32_Half              e_phnum;
  52         Elf32_Half              e_shentsize;
  53         Elf32_Half              e_shnum;
  54         Elf32_Half              e_shstrndx;
  55 } Elf32_Ehdr;
  56
  57 // e_ident EI_CLASS and EI_DATA values
  58 #define ELFCLASSNONE    0
  59 #define ELFCLASS32              1
  60 #define ELFCLASS64              2
  61 #define ELFDATANONE             0
  62 #define ELFDATA2LSB             1
  63 #define ELFDATA2MSB             2
  64
  65 // special section header indices
  66 #define SHN_UNDEF               0
  67 #define SHN_LORESERVE   0xff00
  68 #define SHN_LOPROC              0xff00
  69 #define SHN_HIPROC              0xff1f
  70 #define SHN_ABS                 0xfff1
  71 #define SHN_COMMON              0xfff2
  72 #define SHN_HIRESERVE   0xffff
  73
  74 // program header
  75 typedef struct {
  76         Elf32_Word      p_type;
  77         Elf32_Off       p_offset;
  78         Elf32_Addr      p_vaddr;
  79         Elf32_Addr      p_paddr;
  80         Elf32_Word      p_filesz;
  81         Elf32_Word      p_memsz;
  82         Elf32_Word      p_flags;
  83         Elf32_Word      p_align;
  84 } Elf32_Phdr;
  85
  86 // p_type
  87 #define PT_NULL         0
  88 #define PT_LOAD         1
  89 #define PT_DYNAMIC      2
  90 #define PT_INTERP       3
  91 #define PT_NOTE         4
  92 #define PT_SHLIB        5
  93 #define PT_PHDIR        6
  94 #define PT_LOPROC       0x70000000
  95 #define PT_HIPROC       0x7fffffff
  96
  97 // section header
  98 typedef struct {
  99         Elf32_Word      sh_name;
 100         Elf32_Word      sh_type;
 101         Elf32_Word      sh_flags;
 102         Elf32_Addr      sh_addr;
 103         Elf32_Off       sh_offset;
 104         Elf32_Word      sh_size;
 105         Elf32_Word      sh_link;
 106         Elf32_Word      sh_info;
 107         Elf32_Word      sh_addralign;
 108         Elf32_Word      sh_entsize;
 109 } Elf32_Shdr;
 110
 111 // sh_type values
 112 #define SHT_NULL                0
 113 #define SHT_PROGBITS    1
 114 #define SHT_SYMTAB              2
 115 #define SHT_STRTAB              3
 116 #define SHT_RELA                4
 117 #define SHT_HASH                5
 118 #define SHT_DYNAMIC             6
 119 #define SHT_NOTE                7
 120 #define SHT_NOBITS              8
 121 #define SHT_REL                 9
 122 #define SHT_SHLIB               10
 123 #define SHT_DYNSYM              11
 124 #define SHT_LOPROC              0x70000000
 125 #define SHT_HIPROC              0x7fffffff
 126 #define SHT_LOUSER              0x80000000
 127 #define SHT_HIUSER              0xffffffff
 128
 129 // relocation entry
 130 typedef struct {
 131         Elf32_Addr      r_offset;
 132         Elf32_Word      r_info;
 133 } Elf32_Rel;
 134
 135 // relocation entry with addend
 136 typedef struct {
 137         Elf32_Addr      r_offset;
 138         Elf32_Word      r_info;
 139         Elf32_Sword     r_addend;
 140 } Elf32_Rela;
 141
 142 // r_info accessors
 143 #define ELF32_R_SYM(i)          ((i) >> 8)
 144 #define ELF32_R_TYPE(i)         ((unsigned char)(i))
 145 #define ELF32_R_INFO(s, t)      ((s) << 8 + (unsigned char)(t))
 146
 147 // relocation types (i368 specific)
 148 #define R_386_NONE              0
 149 #define R_386_32                1
 150 #define R_386_PC32              2
 151 #define R_386_GOT32             3
 152 #define R_386_PLT32             4
 153 #define R_386_COPY              5
 154 #define R_386_GLOB_DAT  6
 155 #define R_386_JMP_SLOT  7
 156 #define R_386_RELATIVE  8
 157 #define R_386_GOTOFF    9
 158 #define R_386_GOTPC             10
 159
 160 // symbol table entry
 161 typedef struct {
 162         Elf32_Word      st_name;
 163         Elf32_Addr      st_value;
 164         Elf32_Word      st_size;
 165         Elf32_Word      st_info;
 166         Elf32_Word      st_other;
 167         Elf32_Word      st_shndx;
 168 } Elf32_Sym;
 169
 170 // st_info accessors
 171 #define ELF32_ST_BIND(i)        ((i) >> 4)
 172 #define ELF32_ST_TYPE(i)        ((i) & 0xf)
 173 #define ELF32_ST_INFO(b, t)     ((b) << 4 + (t) & 0xf)
 174
 175 // symbol binding
 176 #define STB_LOCAL               0
 177 #define STB_GLOBAL              1
 178 #define STB_WEAK                2
 179 #define STB_LOPROC              13
 180 #define STB_HIPROC              15
 181
 182 // symbol types
 183 #define STT_NOTYPE              0
 184 #define STT_OBJECT              1
 185 #define STT_FUNC                2
 186 #define STT_SECTION             3
 187 #define STT_FILE                4
 188 #define STT_LOPROC              13
 189 #define STT_HIPROC              15
 190
 191
 192 #endif  // _ELF_H