elf.h

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#ifndef _ELF_H
#define _ELF_H

/// THese constants are for the segment types stored in the image headers 
#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

/// These constants define the different elf file types 
#define ET_NONE   0
#define ET_REL    1
#define ET_EXEC   2
#define ET_DYN    3
#define ET_CORE   4
#define ET_LOPROC 5
#define ET_HIPROC 6

/// These constants define the various ELF target machines 
#define EM_NONE  0
#define EM_M32   1
#define EM_SPARC 2
#define EM_386   3
#define EM_68K   4
#define EM_88K   5
#define EM_486   6   ///< Perhaps disused 
#define EM_860   7

/// This is the info that is needed to parse the dynamic section of the file 
#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

/// This info is needed when parsing the symbol table 
#define STB_LOCAL  0
#define STB_GLOBAL 1
#define STB_WEAK   2

#define STT_NOTYPE  0
#define STT_OBJECT  1
#define STT_FUNC    2
#define STT_SECTION 3
#define STT_FILE    4

#define ELF32_ST_BIND(x) ((x) >> 4)
#define ELF32_ST_TYPE(x) (((unsigned int) x) & 0xf)



struct dynamic{
  int d_tag;
  union{
    int d_val;
    char * d_ptr;
  } d_un;
};

/// THe following are used with relocations 
#define ELF32_R_SYM(x) ((x) >> 8)
#define ELF32_R_TYPE(x) ((x) & 0xff)

#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
#define R_386_NUM       11

struct Elf32_Rel{
  unsigned int * offset;
  int info;
};

struct Elf32_Rela{
  unsigned int * offset;
  int info;
  int addend;
};

struct Elf32_Sym{
  int st_name;
  unsigned int st_value;
  int st_size;
  unsigned char st_info;
  unsigned char st_other;
  short int st_shndx;
};

struct elfhdr{
  char  e_ident[16];
  short int e_type;
  short int e_machine;
  int   e_version;
  char *e_entry;  ///< Entry point 
  int   e_phoff;
  int   e_shoff;
  int   e_flags;
  short int e_ehsize;
  short int e_phentsize;
  short int e_phnum;
  short int e_shentsize;
  short int e_shnum;
  short int e_shstrndx;
};

struct elf_phdr{
  int p_type;
  int p_offset;
  int p_vaddr;
  int p_paddr;
  int p_filesz;
  int p_memsz;
  int p_flags;
  int p_align;
};

#define ELF_START_MMAP 0x80000000

#endif

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