/##
	Copyright 2021 Kyle Gunger

	This file is licensed under the CDDL 1.0 (the License)
	and may only be used in accordance with the License.
	You should have received a copy of the License with this
	software/source code. If you did not, a copy can be found
	at the following URL:

	https://opensource.org/licenses/CDDL-1.0

	THIS SOFTWARE/SOURCE CODE IS PROVIDED "AS IS" WITH NO
	WARRANTY, GUARANTEE, OR CLAIM OF FITNESS FOR ANY PURPOSE
	EXPRESS OR IMPLIED
#/

# Constants and values used in ELF files

# File signature
;const {4}uint8 SIGNATURE_ELF = {0x7F, 'E', 'L', 'F'}

# ELF version always 1
;const uint8 VERSION_ELF = 1

# OS identifiers (from wikipedia)
;enum ABI_ELF [uint8] {
	SystemV		= 0x0,
	HP_UX		= 0x1,
	NetBSD		= 0x2,
	Linux		= 0x3,
	GNUHurd		= 0x4,
	Solaris		= 0x6,
	AIX			= 0x7,
	IRIX		= 0x8,
	FreeBSD		= 0x9,
	Tru64		= 0xA,
	OpenBSD		= 0xC,
	OpenVMS		= 0xD
}

# ELF file types (from wikipedia)
;enum TYPE_ELF [uint16] {
	ET_NONE		= 0x0,
	ET_REL		= 0x1,
	ET_EXEC		= 0x2,
	ET_DYN		= 0x3,
	ET_CORE		= 0x4,
	ET_LOOS		= 0xFE00,
	ET_HIOS		= 0xFEFF,
	ET_LOPROC	= 0xFF00,
	ET_HIPROC	= 0xFFFF
}

# ISA (from wikipedia)
;enum ARCH_ELF [uint16] {
	NONE		= 0x0,
	SPARC		= 0x2,
	x86_32		= 0x3,
	MIPS		= 0x8,
	PowerPC		= 0x14,
	PowerPC64	= 0x15,
	ARM			= 0x28,
	SPARC9		= 0x2B,
	IA_64		= 0x32,
	x86_64		= 0x3E,
	ARM64		= 0xB7,
	RISC_V		= 0xF3
}

# Some zeros to fill out the pad in the header
;const {7}uint8 PAD_ZEROS_ELF = {0, 0, 0, 0, 0, 0, 0}



# Internal file structures

# Identity inside header
;raw struct IdentityELF {
	{4}uint8
		signature,
	
	uint8
		class,
		data,
		version,
		abi,

		# Usually zero
		abiVersion,
	
	{7}uint8
		# Filled with zeros, use PAD_ZEROS_ELF to fill out
		pad
}

# Main header (32 bit)
;raw struct HeaderELF32 {
	IdentityELF
		identity,
	
	uint16
		fileType,
		arch,

	{4}uint8
		version,
		entry,
		programHeader,
		sectionHeader,
	
	{4}uint8
		flags,
	
	uint16
		headerSize,
		programHeaderSize,
		programHeaderEntries,
		sectionHeaderSize,
		sectionHeaderEntries,
		shNameIndex
}

# Main header (64 bit)
;raw struct HeaderELF64 {
	IdentityELF
		identity,
	
	uint16
		fileType,
		arch,

	{4}uint8
		version,
	
	{8}uint8
		entry,
		programHeader,
		sectionHeader,
	
	{4}uint8
		flags,
	
	uint16
		headerSize,
		programHeaderSize,
		programHeaderEntries,
		sectionHeaderSize,
		sectionHeaderEntries,
		shNameIndex
}