#pragma once

static const u32 ELF_MAGIC = 0x7f454c46;

typedef enum
{
	elf_32_bit = 1,
	elf_64_bit = 2,
} elf_bit_format_types;

typedef enum
{
	elf_little_endian = 1,
	elf_big_endian = 2,
} elf_endianness;

typedef enum
{
	elf_relocatable = 1,
	elf_executeable = 2,
	elf_shared = 3,
	elf_core = 4,
} elf_type;

typedef enum
{
	elf_arm = 0x28,
} elf_target_architecture;

typedef struct
{
	u8 magic[4];
	u8 bitFormat;
	u8 endianness;
	u8 elfVersion;
	u8 os;
	u8 padding0[8];
	u8 type[2];
	u8 targetArchitecture[2];
	u8 version[4];
	u8 entryPoint[4];
	u8 programHeaderTableOffset[4];
	u8 sectionHeaderTableOffset[4];
	u8 flags[4];
	u8 headerSize[2];
	u8 programHeaderEntrySize[2];
	u8 programHeaderEntryCount[2];
	u8 sectionTableEntrySize[2];
	u8 sectionHeaderEntryCount[2];
	u8 sectionHeaderNameEntryIndex[2];
} elf_32_hdr;

typedef struct
{
	u8 magic[4];
	u8 bitFormat;
	u8 endianness;
	u8 elfVersion;
	u8 os;
	u8 padding0[8];
	u8 type[2];
	u8 targetArchitecture[2];
	u8 version[4];
	u8 entryPoint[8];
	u8 programHeaderTableOffset[8];
	u8 sectionHeaderTableOffset[8];
	u8 flags[4];
	u8 headerSize[2];
	u8 programHeaderEntrySize[2];
	u8 programHeaderEntryCount[2];
	u8 sectionTableEntrySize[2];
	u8 sectionHeaderEntryCount[2];
	u8 sectionHeaderNameEntryIndex[2];
} elf_64_hdr;

/* taken from elf specs, will not follow global style */

/* Section header.  */

/* Legal values for sh_type (section type).  */

#define SHT_NULL			0		/* Section header table entry unused */
#define SHT_PROGBITS		1		/* Program data */
#define SHT_SYMTAB			2		/* Symbol table */
#define SHT_STRTAB			3		/* String table */
#define SHT_RELA			4		/* Relocation entries with addends */
#define SHT_HASH			5		/* Symbol hash table */
#define SHT_DYNAMIC			6		/* Dynamic linking information */
#define SHT_NOTE			7		/* Notes */
#define SHT_NOBITS			8		/* Program space with no data (bss) */
#define SHT_REL				9		/* Relocation entries, no addends */
#define SHT_SHLIB			10		/* Reserved */
#define SHT_DYNSYM			11		/* Dynamic linker symbol table */
#define	SHT_UNKNOWN12		12
#define	SHT_UNKNOWN13		13
#define	SHT_INIT_ARRAY		14
#define	SHT_FINI_ARRAY		15
#define	SHT_PREINIT_ARRAY	16
#define	SHT_GROUP			17
#define	SHT_SYMTAB_SHNDX	18
#define	SHT_NUM				19
#define SHT_ARM_EXIDX		0x70000001 /* Exception Index table */
#define SHT_ARM_PREEMPTMAP	0x70000002 /* BPABI DLL dynamic linking pre-emption map*/
#define SHT_ARM_ATTRIBUTES	0x70000003 /* Object file compatibility attributes */
#define SHT_ARM_DEBUGOVERLAY	0x70000004
#define SHT_ARM_OVERLAYSECTION	0x70000005

#define	SHF_WRITE		0x01		/* sh_flags */
#define	SHF_ALLOC		0x02
#define	SHF_EXECINSTR		0x04
#define	SHF_MERGE		0x10
#define	SHF_STRINGS		0x20
#define	SHF_INFO_LINK		0x40
#define	SHF_LINK_ORDER		0x80
#define	SHF_OS_NONCONFORMING	0x100
#define	SHF_GROUP		0x200
#define	SHF_TLS			0x400


typedef struct
{
  u8 sh_name[4];		/* Section name (string tbl index) */
  u8 sh_type[4];		/* Section type */
  u8 sh_flags[4];		/* Section flags */
  u8 sh_addr[4];		/* Section virtual addr at execution */
  u8 sh_offset[4];		/* Section file offset */
  u8 sh_size[4];		/* Section size in bytes */
  u8 sh_link[4];		/* Link to another section */
  u8 sh_info[4];		/* Additional section information */
  u8 sh_addralign[4];		/* Section alignment */
  u8 sh_entsize[4];		/* Entry size if section holds table */
} elf_32_shdr;

typedef struct
{
  u8 sh_name[8];		/* Section name (string tbl index) */
  u8 sh_type[8];		/* Section type */
  u8 sh_flags[8];		/* Section flags */
  u8 sh_addr[8];		/* Section virtual addr at execution */
  u8 sh_offset[8];		/* Section file offset */
  u8 sh_size[8];		/* Section size in bytes */
  u8 sh_link[8];		/* Link to another section */
  u8 sh_info[8];		/* Additional section information */
  u8 sh_addralign[8];		/* Section alignment */
  u8 sh_entsize[8];		/* Entry size if section holds table */
} elf_64_shdr;

/* Program segment header.  */

/* p_type legal values */
#define	PT_NULL		0		/* Program header table entry unused */
#define PT_LOAD		1		/* Loadable program segment */
#define PT_DYNAMIC	2		/* Dynamic linking information */
#define PT_INTERP	3		/* Program interpreter */
#define PT_NOTE		4		/* Auxiliary information */
#define PT_SHLIB	5		/* Reserved */
#define PT_PHDR		6		/* Entry for header table itself */
#define	PT_NUM		7		/* Number of defined types.  */
#define PT_LOOS		0x60000000	/* Start of OS-specific */
#define PT_HIOS		0x6fffffff	/* End of OS-specific */
#define PT_LOPROC	0x70000000	/* Start of processor-specific */
#define PT_HIPROC	0x7fffffff	/* End of processor-specific */

#define PF_CTRSDK	0x80000000
#define	PF_R		0x4		/* p_flags */
#define	PF_W		0x2
#define	PF_X		0x1


typedef struct
{
  u8 p_type[4];			/* Segment type */
  u8 p_offset[4];		/* Segment file offset */
  u8 p_vaddr[4];		/* Segment virtual address */
  u8 p_paddr[4];		/* Segment physical address */
  u8 p_filesz[4];		/* Segment size in file */
  u8 p_memsz[4];		/* Segment size in memory */
  u8 p_flags[4];		/* Segment flags */
  u8 p_align[4];		/* Segment alignment */
} elf_32_phdr;

typedef struct
{
  u8 p_type[8];			/* Segment type */
  u8 p_flags[8];		/* Segment flags */
  u8 p_offset[8];		/* Segment file offset */
  u8 p_vaddr[8];		/* Segment virtual address */
  u8 p_paddr[8];		/* Segment physical address */
  u8 p_filesz[8];		/* Segment size in file */
  u8 p_memsz[8];		/* Segment size in memory */
  u8 p_align[8];		/* Segment alignment */
} elf_64_phdr;