// Elf.h

#ifndef ELF_H
#define ELF_H

// types
typedef uint32          Elf32_Addr;
typedef uint16          Elf32_Half;
typedef uint32          Elf32_Off;
typedef int32           Elf32_Sword;
typedef uint32          Elf32_Word;

// e_ident indices
#define EI_MAG0         0
#define EI_MAG1         1
#define EI_MAG2         2
#define EI_MAG3         3
#define EI_CLASS        4
#define EI_DATA         5
#define EI_VERSION      6
#define EI_PAD          7
#define EI_NIDENT       16

// object file header
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;

// e_ident EI_CLASS and EI_DATA values
#define ELFCLASSNONE    0
#define ELFCLASS32              1
#define ELFCLASS64              2
#define ELFDATANONE             0
#define ELFDATA2LSB             1
#define ELFDATA2MSB             2

// 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;

// p_type
#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_PHDIR        6
#define PT_LOPROC       0x70000000
#define PT_HIPROC       0x7fffffff

// 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 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              0xffffffff

#endif  // ELF_H