elf.h

完整的Bell实验室的嵌入式文件系统TFS

/* elf.h:
 *  Used to support ELF file format in TFS.
 *  The data in this header file is built primarily from information in
 *  the book "Understanding ELF Object Files and Debugging Tools"
 *  All page references in comments refer to that book.
 *
 *  General notice:
 *  This code is part of a boot-monitor package developed as a generic base
 *  platform for embedded system designs.  As such, it is likely to be
 *  distributed to various projects beyond the control of the original
 *  author.  Please notify the author of any enhancements made or bugs found
 *  so that all may benefit from the changes.  In addition, notification back
 *  to the author will allow the new user to pick up changes that may have
 *  been made by other users after this version of the code was distributed.
 *
 *  Note1: the majority of this code was edited with 4-space tabs.
 *  Note2: as more and more contributions are accepted, the term "author"
 *         is becoming a mis-representation of credit.
 *
 *  Original author:    Ed Sutter
 *  Email:              [e-mail]
 *  Phone:              908-582-2351
 */

typedef unsigned short  Elf32_Half;
typedef unsigned long   Elf32_Word;
typedef unsigned long   Elf32_Addr;
typedef unsigned long   Elf32_Off;

/* Size of ELF identification field. */
#define EI_NIDENT   16

/* e_type values... */
#define ET_NONE     0
#define ET_REL      1
#define ET_EXEC     2
#define ET_DYN      3
#define ET_CORE     4
#define ET_LOPROC   0xff00
#define ET_HIPROC   0xffff


struct elf_fhdr {       /* pg 12 */
    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;
};

#define ELFFHDR struct elf_fhdr

/* sh_flags values... */
#define SHF_WRITE       0x1
#define SHF_ALLOC       0x2
#define SHF_EXECINSTR   0x4
#define SHF_MASKPROC    0xf0000000

/* sh_type values... */
#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      0x8fffffff

struct elf_shdr {       /* pg 19 */
    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;
};

#define ELFSHDR struct elf_shdr

#define STB_LOCAL   0
#define STB_GLOBAL  1
#define STB_WEAK    2
#define STB_LOPROC  13
#define STB_HIPROC  15

#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

#define SHN_UNDEF   0

struct elf_sym {
    Elf32_Word      st_name;
    Elf32_Addr      st_value;
    Elf32_Word      st_size;
    unsigned char   st_info;
    unsigned char   st_other;
    Elf32_Half      st_shndx;
};