ir_elf.h

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/*
 * 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