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/*
* ELF data structures and values
*/
typedef unsigned short Elf32_Half;
typedef unsigned int Elf32_Word;
typedef signed int Elf32_Sword;
typedef unsigned int Elf32_Off;
typedef unsigned int Elf32_Addr;
typedef unsigned char Elf_Char;
/*
* File Header
*/
#define EI_NIDENT 16
typedef struct {
Elf_Char e_ident[EI_NIDENT];
Elf32_Half e_type;
Elf32_Half e_machine;
Elf32_Word e_version;
Elf32_Addr e_entry;
Elf32_Off e_phoff;
Elf32_Off e_shoff;
Elf32_Word e_flags;
Elf32_Half e_ehsize;
Elf32_Half e_phentsize;
Elf32_Half e_phnum;
Elf32_Half e_shentsize;
Elf32_Half e_shnum;
Elf32_Half e_shstrndx;
} Elf32_Ehdr;
/* e_indent */
#define EI_MAG0 0 /* File identification byte 0 index */
#define EI_MAG1 1 /* File identification byte 1 index */
#define EI_MAG2 2 /* File identification byte 2 index */
#define EI_MAG3 3 /* File identification byte 3 index */
#define EI_CLASS 4 /* File class */
#define ELFCLASSNONE 0 /* Invalid class */
#define ELFCLASS32 1 /* 32-bit objects */
#define ELFCLASS64 2 /* 64-bit objects */
#define EI_DATA 5 /* Data encoding */
#define ELFDATANONE 0 /* Invalid data encoding */
#define ELFDATA2LSB 1 /* 2's complement, little endian */
#define ELFDATA2MSB 2 /* 2's complement, big endian */
#define EI_VERSION 6 /* File version */
#define EI_PAD 7 /* Start of padding bytes */
#define ELFMAG0 0x7F /* Magic number byte 0 */
#define ELFMAG1 'E' /* Magic number byte 1 */
#define ELFMAG2 'L' /* Magic number byte 2 */
#define ELFMAG3 'F' /* Magic number byte 3 */
/* e_type */
#define ET_NONE 0 /* No file type */
#define ET_REL 1 /* Relocatable file */
#define ET_EXEC 2 /* Executable file */
#define ET_DYN 3 /* Shared object file */
#define ET_CORE 4 /* Core file */
#define ET_LOPROC 0xFF00 /* Processor-specific */
#define ET_HIPROC 0xFFFF /* Processor-specific */
/* e_machine */
#define EM_NONE 0 /* No machine */
#define EM_M32 1 /* AT&T WE 32100 */
#define EM_SPARC 2 /* SUN SPARC */
#define EM_386 3 /* Intel 80386 */
#define EM_68K 4 /* Motorola m68k family */
#define EM_88K 5 /* Motorola m88k family */
#define EM_860 7 /* Intel 80860 */
#define EM_MIPS 8 /* MIPS R3000 */
/* e_version */
#define EV_NONE 0 /* Invalid ELF version */
#define EV_CURRENT 1 /* Current version */
/*
* Program Header
*/
typedef struct {
Elf32_Word p_type; /* Identifies program segment type */
Elf32_Off p_offset; /* Segment file offset */
Elf32_Addr p_vaddr; /* Segment virtual address */
Elf32_Addr p_paddr; /* Segment physical address */
Elf32_Word p_filesz; /* Segment size in file */
Elf32_Word p_memsz; /* Segment size in memory */
Elf32_Word p_flags; /* Segment flags */
Elf32_Word p_align; /* Segment alignment, file & memory */
} Elf32_Phdr;
/* p_type */
#define PT_NULL 0 /* Program header table entry unused */
#define PT_LOAD 1 /* Loadable program segment */
#define PT_DYNAMIC 2 /* Dynamic linking information */
#define PT_INTERP 3 /* Program interpreter */
#define PT_NOTE 4 /* Auxiliary information */
#define PT_SHLIB 5 /* Reserved, unspecified semantics */
#define PT_PHDR 6 /* Entry for header table itself */
#define PT_LOPROC 0x70000000 /* Processor-specific */
#define PT_HIPROC 0x7FFFFFFF /* Processor-specific */
/* p_flags */
#define PF_X (1 << 0) /* Segment is executable */
#define PF_W (1 << 1) /* Segment is writable */
#define PF_R (1 << 2) /* Segment is readable */
#define PF_MASKPROC 0xF0000000 /* Processor-specific reserved bits */
/*
* Section Header
*/
typedef struct {
Elf32_Word sh_name;
Elf32_Word sh_type;
Elf32_Word sh_flags;
Elf32_Addr sh_addr;
Elf32_Off sh_offset;
Elf32_Word sh_size;
Elf32_Word sh_link;
Elf32_Word sh_info;
Elf32_Word sh_addralign;
Elf32_Word sh_entsize;
} Elf32_Shdr;
/* sh_type */
#define SHT_NULL 0 /* Section header table entry unused */
#define SHT_PROGBITS 1 /* Program specific (private) data */
#define SHT_SYMTAB 2 /* Link editing symbol table */
#define SHT_STRTAB 3 /* A string table */
#define SHT_RELA 4 /* Relocation entries with addends */
#define SHT_HASH 5 /* A symbol hash table */
#define SHT_DYNAMIC 6 /* Information for dynamic linking */
#define SHT_NOTE 7 /* Information that marks file */
#define SHT_NOBITS 8 /* Section occupies no space in file */
#define SHT_REL 9 /* Relocation entries, no addends */
#define SHT_SHLIB 10 /* Reserved, unspecified semantics */
#define SHT_DYNSYM 11 /* Dynamic linking symbol table */
#define SHT_LOPROC 0x70000000 /* Processor-specific semantics, lo */
#define SHT_HIPROC 0x7FFFFFFF /* Processor-specific semantics, hi */
#define SHT_LOUSER 0x80000000 /* Application-specific semantics */
#define SHT_HIUSER 0x8FFFFFFF /* Application-specific semantics */
/* sh_flags */
#define SHF_WRITE (1 << 0) /* Writable data during execution */
#define SHF_ALLOC (1 << 1) /* Occupies memory during execution */
#define SHF_EXECINSTR (1 << 2) /* Executable machine instructions */
#define SHF_MASKPROC 0xF0000000 /* Processor-specific semantics */
/*
* Symbol Table
*/
typedef struct {
Elf32_Word st_name;
Elf32_Addr st_value;
Elf32_Word st_size;
Elf_Char st_info;
Elf_Char st_other;
Elf32_Half st_shndx;
} Elf32_Sym;
#define ELF_ST_BIND(val) (((unsigned int)(val)) >> 4)
#define ELF_ST_TYPE(val) ((val) & 0xF)
#define ELF_ST_INFO(bind,type) (((bind) << 4) | ((type) & 0xF))
/* symbol binding */
#define STB_LOCAL 0 /* Symbol not visible outside obj */
#define STB_GLOBAL 1 /* Symbol visible outside obj */
#define STB_WEAK 2 /* Like globals, lower precedence */
#define STB_LOPROC 13 /* Application-specific semantics */
#define STB_HIPROC 15 /* Application-specific semantics */
/* symbol type */
#define STT_NOTYPE 0 /* Symbol type is unspecified */
#define STT_OBJECT 1 /* Symbol is a data object */
#define STT_FUNC 2 /* Symbol is a code object */
#define STT_SECTION 3 /* Symbol associated with a section */
#define STT_FILE 4 /* Symbol gives a file name */
#define STT_LOPROC 13 /* Application-specific semantics */
#define STT_HIPROC 15 /* Application-specific semantics */
/* special values st_shndx */
#define SHN_UNDEF 0 /* Undefined section reference */
#define SHN_LORESERV 0xFF00 /* Begin range of reserved indices */
#define SHN_LOPROC 0xFF00 /* Begin range of appl-specific */
#define SHN_HIPROC 0xFF1F /* End range of appl-specific */
#define SHN_ABS 0xFFF1 /* Associated symbol is absolute */
#define SHN_COMMON 0xFFF2 /* Associated symbol is in common */
#define SHN_HIRESERVE 0xFFFF /* End range of reserved indices */
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