/**
 * @file elf_format.cpp
 * @brief Defines ELF binary format info.
 *
 * Free to use, written by Clyne Sullivan.
 */

#ifndef STMDSP_ELF_FORMAT_HPP_
#define STMDSP_ELF_FORMAT_HPP_

#include <cstdint>

#define EI_NIDENT 16

#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_RESERVED 0x70000000

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

#define ELF32_R_SYM(i)     ((i) >> 8)
#define ELF32_R_TYPE(i)    ((i) & 0xFF)
#define ELF32_R_INFO(s, t) (((s) << 8) + ((t) & 0xFF))

typedef uint32_t Elf32_Addr;
typedef uint16_t Elf32_Half;
typedef uint32_t Elf32_Off;
typedef uint32_t Elf32_Sword;
typedef uint32_t Elf32_Word;

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;
} __attribute__((packed)) Elf32_Ehdr;

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;
} __attribute__((packed)) Elf32_Shdr;

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;
} __attribute__((packed)) Elf32_Sym;

typedef struct {
	Elf32_Addr r_offset;
	Elf32_Word r_info;
} __attribute__((packed)) Elf32_Rel;

typedef struct {
	Elf32_Addr  r_offset;
	Elf32_Word  r_info;
	Elf32_Sword r_addend;
} __attribute__((packed)) Elf32_Rela;

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;
} __attribute__((packed)) Elf32_Phdr;

#endif // STMDSP_ELF_FORMAT_HPP_