elf.h

ELFkickers是一组elf工具

/* elf.h: definitions of ELF structures and symbols
 *
 * The usage of ELF under Linux is currently in flux, even ignoring
 * architectures beyond the x86. As a result, I have found it hard to
 * make use of the usual header files <elf.h> and <linux/elf.h> in
 * this program, as newer symbols do not appear in the header files
 * associated with earlier versions of the kernel and/or compiler.
 * Furthermore, the two header files are incompatible with each other,
 * as they have numerous overlapping (yet occasionally different)
 * typedefs, yet a number of definitions appear in one file but not
 * the other. To avoid this mess, elftoc uses this include file
 * instead. Where possible, the definitions are taken verbatim from
 * the original ELF standard itself. Other definitions are extracted
 * from recent versions of the aforementioned system header files.
 *
 * By using this header file instead, elftoc (and the source code it
 * generates) is made much more independent of the details of the
 * system it was originally compiled on.
 */

#ifndef	_elftoc_elf_h_
#define	_elftoc_elf_h_

/*
 * The platform-dependent typedefs.
 */

typedef	unsigned int	Elf32_Addr;
typedef	unsigned short	Elf32_Half;
typedef	unsigned int	Elf32_Off;
typedef	unsigned int	Elf32_Word;
typedef	signed int	Elf32_Sword;

/*
 * Definitions taken from the ELF standard.
 */

/* Figure 1-3: ELF Header
 */
#define EI_NIDENT       16

typedef struct {
    unsigned 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;

#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 */

#define EM_NONE       0  /* No machine */
#define EM_M32        1  /* AT&T WE 32100 */
#define EM_SPARC      2  /* SPARC */
#define EM_386        3  /* Intel 80386 */
#define EM_68K        4  /* Motorola 68000 */
#define EM_88K        5  /* Motorola 88000 */
#define EM_860        7  /* Intel 80860 */
#define EM_MIPS       8  /* MIPS RS3000 */

#define EV_NONE          0  /* Invalid version */
#define EV_CURRENT       1  /* Current version */

/* Figure 1-4: e_ident[] Identification Indexes
 */
#define EI_MAG0	     0  /* File identification */
#define EI_MAG1	     1  /* File identification */
#define EI_MAG2	     2  /* File identification */
#define EI_MAG3	     3  /* File identification */
#define EI_CLASS     4  /* File class */
#define EI_DATA	     5  /* Data encoding */
#define EI_VERSION   6  /* File version */
#define EI_PAD	     7  /* Start of padding bytes */

#define ELFMAG0    0x7f   /* e_ident[EI_MAG0] */
#define ELFMAG1    'E'    /* e_ident[EI_MAG1] */
#define ELFMAG2    'L'    /* e_ident[EI_MAG2] */
#define ELFMAG3    'F'    /* e_ident[EI_MAG3] */

#define ELFCLASSNONE       0  /* Invalid class */
#define ELFCLASS32         1  /* 32-bit objects */
#define ELFCLASS64         2  /* 64-bit objects */

#define ELFDATANONE        0  /* Invalid data encoding */
#define ELFDATA2LSB        1  /* little-endian */
#define ELFDATA2MSB        2  /* big-endian */

/* Figure 1-8: Special Section Indexes
 */
#define SHN_UNDEF            0
#define SHN_LORESERVE   0xff00
#define SHN_LOPROC      0xff00
#define SHN_HIPROC      0xff1f
#define SHN_ABS         0xfff1
#define SHN_COMMON      0xfff2
#define SHN_HIRESERVE   0xffff

/* Figure 1-9: 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;

/* Figure 1-10: Section Types, sh_type
 */
#define SHT_NULL               0
#define SHT_PROGBITS           1
#define SHT_SYMTAB             2
#define SHT_STRTAB	       3
#define SHT_RELA	       4
#define SHT_HASH	       5
#define SHT_DYNAMIC            6
#define SHT_NOTE	       7
#define SHT_NOBITS	       8
#define SHT_REL		       9
#define SHT_SHLIB             10
#define SHT_DYNSYM            11
#define SHT_LOPROC    0x70000000
#define SHT_HIPROC    0x7fffffff
#define SHT_LOUSER    0x80000000
#define SHT_HIUSER    0xffffffff

/* Figure 1-12: Section Attribute Flags, sh_flags
 */
#define SHF_WRITE             0x1
#define SHF_ALLOC             0x2
#define SHF_EXECINSTR         0x4
#define SHF_MASKPROC   0xf0000000

#define	STN_UNDEF		0

/* Figure 1-16: Symbol Table Entry
 */
typedef struct {
    Elf32_Word		st_name;
    Elf32_Addr		st_value;
    Elf32_Word		st_size;
    unsigned char	st_info;
    unsigned char	st_other;
    Elf32_Half		st_shndx;
} Elf32_Sym;

#define ELF32_ST_BIND(i)	((i)>>4)
#define ELF32_ST_TYPE(i)	((i)&0xf)
#define ELF32_ST_INFO(b, t)	(((b)<<4)+((t)&0xf))

/* Figure 1-17: Symbol Binding, ELF32_ST_BIND
 */
#define STB_LOCAL       0
#define STB_GLOBAL      1
#define STB_WEAK        2
#define STB_LOPROC     13
#define STB_HIPROC     15

/* Figure 1-18: Symbol Types, ELF32_ST_TYPE
 */
#define STT_NOTYPE       0
#define STT_OBJECT       1
#define STT_FUNC         2
#define STT_SECTION      3
#define STT_FILE         4
#define STT_LOPROC      13
#define STT_HIPROC      15

/* Figure 1-20: Relocation Entries
 */
typedef struct {
    Elf32_Addr		r_offset;
    Elf32_Word		r_info;
} Elf32_Rel;

typedef struct {
    Elf32_Addr		r_offset;
    Elf32_Word		r_info;
    Elf32_Sword		r_addend;
} Elf32_Rela;

#define ELF32_R_SYM(i)		((i)>>8)
#define ELF32_R_TYPE(i)		((unsigned char)(i))
#define ELF32_R_INFO(s, t)	(((s)<<8)+(unsigned char)(t))

/* Figure 1-22: Relocation Types
 */
#define R_386_NONE          0
#define R_386_32	    1
#define R_386_PC32	    2
#define R_386_GOT32	    3
#define R_386_PLT32	    4
#define R_386_COPY	    5
#define R_386_GLOB_DAT      6
#define R_386_JMP_SLOT      7
#define R_386_RELATIVE      8
#define R_386_GOTOFF	    9
#define R_386_GOTPC	   10

/* Figure 2-1: Program Header
 */
typedef struct {
    Elf32_Word        p_type;
    Elf32_Off         p_offset;
    Elf32_Addr        p_vaddr;
    Elf32_Addr        p_paddr;
    Elf32_Word        p_filesz;
    Elf32_Word        p_memsz;
    Elf32_Word        p_flags;
    Elf32_Word        p_align;
} Elf32_Phdr;

#define PT_NULL              0
#define PT_LOAD              1
#define PT_DYNAMIC           2
#define PT_INTERP            3
#define PT_NOTE              4
#define PT_SHLIB             5
#define PT_PHDR              6
#define PT_LOPROC   0x70000000
#define PT_HIPROC   0x7fffffff

/* Figure 2-9: Dynamic Structure
 */
typedef struct {
    Elf32_Sword d_tag;
    union {
        Elf32_Sword	d_val;
        Elf32_Addr	d_ptr;
    } d_un;
} Elf32_Dyn;

#define DT_NULL                  0
#define DT_NEEDED		 1
#define DT_PLTRELSZ		 2
#define DT_PLTGOT		 3
#define DT_HASH		 	 4
#define DT_STRTAB		 5
#define DT_SYMTAB		 6
#define DT_RELA		 	 7
#define DT_RELASZ		 8
#define DT_RELAENT		 9
#define DT_STRSZ		10
#define DT_SYMENT		11
#define DT_INIT			12
#define DT_FINI			13
#define DT_SONAME		14
#define DT_RPATH		15
#define DT_SYMBOLIC		16
#define DT_REL			17
#define DT_RELSZ		18
#define DT_RELENT		19
#define DT_PLTREL		20
#define DT_DEBUG		21
#define DT_TEXTREL		22
#define DT_JMPREL		23
#define DT_LOPROC       0x70000000
#define DT_HIPROC       0x7fffffff

/*
 * Additional definitions from <elf.h> and <linux/elf.h>.
 */

#undef EI_PAD

#define EI_OSABI	7		/* OS ABI identification */
#define EI_ABIVERSION	8		/* ABI version */
#define EI_PAD		9		/* Byte index of padding bytes */

#define ELFOSABI_SYSV		0	/* UNIX System V ABI */
#define ELFOSABI_HPUX		1	/* HP-UX */
#define ELFOSABI_ARM		97	/* ARM */
#define ELFOSABI_STANDALONE	255	/* Standalone (embedded) application */

#define EM_486           6              /* Perhaps disused */
#define EM_S370		 9		/* Amdahl */
#define EM_MIPS_RS3_LE	10		/* MIPS R3000 little-endian */
#define EM_MIPS_RS4_BE	10		/* MIPS R4000 big-endian */
#define EM_RS6000	11		/* RS6000 */

#define EM_PARISC	15		/* HPPA */
#define EM_nCUBE	16		/* nCUBE */
#define EM_VPP500	17		/* Fujitsu VPP500 */
#define EM_SPARC32PLUS	18		/* Sun's "v8plus" */
#define EM_960		19		/* Intel 80960 */