ir_elf.h

/*
 * IR - Lightweight JIT Compilation Framework
 * (ELF header definitions)
 * Copyright (C) 2022 Zend by Perforce.
 * Authors: Dmitry Stogov <dmitry@php.net>
 */

#ifndef IR_ELF
#define IR_ELF

#if defined(IR_TARGET_X64) || defined(IR_TARGET_AARCH64)
# define ELF64
#else
# undef ELF64
#endif

typedef struct _ir_elf_header {
	uint8_t   emagic[4];
	uint8_t   eclass;
	uint8_t   eendian;
	uint8_t   eversion;
	uint8_t   eosabi;
	uint8_t   eabiversion;
	uint8_t   epad[7];
	uint16_t  type;
	uint16_t  machine;
	uint32_t  version;
	uintptr_t entry;
	uintptr_t phofs;
	uintptr_t shofs;
	uint32_t  flags;
	uint16_t  ehsize;
	uint16_t  phentsize;
	uint16_t  phnum;
	uint16_t  shentsize;
	uint16_t  shnum;
	uint16_t  shstridx;
} ir_elf_header;

typedef struct ir_elf_sectheader {
	uint32_t  name;
	uint32_t  type;
	uintptr_t flags;
	uintptr_t addr;
	uintptr_t ofs;
	uintptr_t size;
	uint32_t  link;
	uint32_t  info;
	uintptr_t align;
	uintptr_t entsize;
} ir_elf_sectheader;

#define ELFSECT_IDX_ABS     0xfff1

enum {
	ELFSECT_TYPE_PROGBITS = 1,
	ELFSECT_TYPE_SYMTAB = 2,
	ELFSECT_TYPE_STRTAB = 3,
	ELFSECT_TYPE_NOBITS = 8,
	ELFSECT_TYPE_DYNSYM = 11,
};

#define ELFSECT_FLAGS_WRITE (1 << 0)
#define ELFSECT_FLAGS_ALLOC (1 << 1)
#define ELFSECT_FLAGS_EXEC  (1 << 2)
#define ELFSECT_FLAGS_TLS   (1 << 10)

typedef struct ir_elf_symbol {
#ifdef ELF64
	uint32_t  name;
	uint8_t   info;
	uint8_t   other;
	uint16_t  sectidx;
	uintptr_t value;
	uint64_t  size;
#else
	uint32_t  name;
	uintptr_t value;
	uint32_t  size;
	uint8_t   info;
	uint8_t   other;
	uint16_t  sectidx;
#endif
} ir_elf_symbol;

#define ELFSYM_BIND(info)       ((info) >> 4)
#define ELFSYM_TYPE(info)       ((info) & 0xf)
#define ELFSYM_INFO(bind, type) (((bind) << 4) | (type))

enum {
	ELFSYM_TYPE_DATA = 2,
	ELFSYM_TYPE_FUNC = 2,
	ELFSYM_TYPE_FILE = 4,
};

enum {
	ELFSYM_BIND_LOCAL  = 0,
	ELFSYM_BIND_GLOBAL = 1,
};

#endif