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 193