path: root/elfcpp/elfcpp.h

// elfcpp.h -- main header file for elfcpp    -*- C++ -*-

// This is the external interface for elfcpp.

#ifndef ELFCPP_H
#define ELFCPP_H

#include "elfcpp_config.h"

#include <stdint.h>

namespace elfcpp
{

// Basic ELF types.

// These types are always the same size.

typedef uint16_t Elf_Half;
typedef uint32_t Elf_Word;
typedef int32_t Elf_Sword;
typedef uint64_t Elf_Xword;
typedef int64_t Elf_Sxword;

// These types vary in size depending on the ELF file class.  The
// template parameter should be 32 or 64.

template<int size>
struct Elf_types
{
  // Dummy types which should not be used.
  typedef unsigned char Elf_Addr;
  typedef unsigned char Elf_Off;
  // WXword is for fields which are Elf32_Word and Elf64_Xword.
  typedef unsigned char Elf_WXword;
};

template<>
struct Elf_types<32>
{
  typedef uint32_t Elf_Addr;
  typedef uint32_t Elf_Off;
  typedef uint32_t Elf_WXword;
};

template<>
struct Elf_types<64>
{
  typedef uint64_t Elf_Addr;
  typedef uint64_t Elf_Off;
  typedef uint64_t Elf_WXword;
  static const int ehdr_size;
  static const int shdr_size;
  static const int sym_size;
};

// Offsets within the Ehdr e_ident field.

const int EI_MAG0 = 0;
const int EI_MAG1 = 1;
const int EI_MAG2 = 2;
const int EI_MAG3 = 3;
const int EI_CLASS = 4;
const int EI_DATA = 5;
const int EI_VERSION = 6;
const int EI_OSABI = 7;
const int EI_ABIVERSION = 8;
const int EI_PAD = 9;
const int EI_NIDENT = 16;

// The valid values found in Ehdr e_ident[EI_MAG0 through EI_MAG3].

const int ELFMAG0 = 0x7f;
const int ELFMAG1 = 'E';
const int ELFMAG2 = 'L';
const int ELFMAG3 = 'F';

// The valid values found in Ehdr e_ident[EI_CLASS].

enum
{
  ELFCLASSNONE = 0,
  ELFCLASS32 = 1,
  ELFCLASS64 = 2
};

// The valid values found in Ehdr e_ident[EI_DATA].

enum
{
  ELFDATANONE = 0,
  ELFDATA2LSB = 1,
  ELFDATA2MSB = 2
};

// The valid values found in Ehdr e_ident[EI_VERSION] and e_version.

enum
{
  EV_NONE = 0,
  EV_CURRENT = 1
};

// The valid values found in Ehdr e_ident[EI_OSABI].

enum ELFOSABI
{
  ELFOSABI_NONE = 0,
  ELFOSABI_HPUX = 1,
  ELFOSABI_NETBSD = 2,
  // ELFOSABI_LINUX is not listed in the ELF standard.
  ELFOSABI_LINUX = 3,
  // ELFOSABI_HURD is not listed in the ELF standard.
  ELFOSABI_HURD = 4,
  ELFOSABI_SOLARIS = 6,
  ELFOSABI_AIX = 7,
  ELFOSABI_IRIX = 8,
  ELFOSABI_FREEBSD = 9,
  ELFOSABI_TRU64 = 10,
  ELFOSABI_MODESTO = 11,
  ELFOSABI_OPENBSD = 12,
  ELFOSABI_OPENVMS = 13,
  ELFOSABI_NSK = 14,
  ELFOSABI_AROS = 15,
  // A GNU extension for the ARM.
  ELFOSABI_ARM = 97,
  // A GNU extension for the MSP.
  ELFOSABI_STANDALONE = 255
};

// The valid values found in the Ehdr e_type field.

enum ET
{
  ET_NONE = 0,
  ET_REL = 1,
  ET_EXEC = 2,
  ET_DYN = 3,
  ET_CORE = 4,
  ET_LOOS = 0xfe00,
  ET_HIOS = 0xfeff,
  ET_LOPROC = 0xff00,
  ET_HIPROC = 0xffff
};

// The valid values found in the Ehdr e_machine field.

enum EM
{
  EM_NONE = 0,
  EM_M32 = 1,
  EM_SPARC = 2,
  EM_386 = 3,
  EM_68K = 4,
  EM_88K = 5,
  // 6 used to be EM_486
  EM_860 = 7,
  EM_MIPS = 8,
  EM_S370 = 9,
  EM_MIPS_RS3_LE = 10,
  // 11 was the old Sparc V9 ABI.
  // 12 through 14 are reserved.
  EM_PARISC = 15,
  // 16 is reserved.
  // Some old PowerPC object files use 17.
  EM_VPP500 = 17,
  EM_SPARC32PLUS = 18,
  EM_960 = 19,
  EM_PPC = 20,
  EM_PPC64 = 21,
  EM_S390 = 22,
  // 23 through 35 are served.
  EM_V800 = 36,
  EM_FR20 = 37,
  EM_RH32 = 38,
  EM_RCE = 39,
  EM_ARM = 40,
  EM_ALPHA = 41,
  EM_SH = 42,
  EM_SPARCV9 = 43,
  EM_TRICORE = 44,
  EM_ARC = 45,
  EM_H8_300 = 46,
  EM_H8_300H = 47,
  EM_H8S = 48,
  EM_H8_500 = 49,
  EM_IA_64 = 50,
  EM_MIPS_X = 51,
  EM_COLDFIRE = 52,
  EM_68HC12 = 53,
  EM_MMA = 54,
  EM_PCP = 55,
  EM_NCPU = 56,
  EM_NDR1 = 57,
  EM_STARCORE = 58,
  EM_ME16 = 59,
  EM_ST100 = 60,
  EM_TINYJ = 61,
  EM_X86_64 = 62,
  EM_PDSP = 63,
  EM_PDP10 = 64,
  EM_PDP11 = 65,
  EM_FX66 = 66,
  EM_ST9PLUS = 67,
  EM_ST7 = 68,
  EM_68HC16 = 69,
  EM_68HC11 = 70,
  EM_68HC08 = 71,
  EM_68HC05 = 72,
  EM_SVX = 73,
  EM_ST19 = 74,
  EM_VAX = 75,
  EM_CRIS = 76,
  EM_JAVELIN = 77,
  EM_FIREPATH = 78,
  EM_ZSP = 79,
  EM_MMIX = 80,
  EM_HUANY = 81,
  EM_PRISM = 82,
  EM_AVR = 83,
  EM_FR30 = 84,
  EM_D10V = 85,
  EM_D30V = 86,
  EM_V850 = 87,
  EM_M32R = 88,
  EM_MN10300 = 89,
  EM_MN10200 = 90,
  EM_PJ = 91,
  EM_OPENRISC = 92,
  EM_ARC_A5 = 93,
  EM_XTENSA = 94,
  EM_VIDEOCORE = 95,
  EM_TMM_GPP = 96,
  EM_NS32K = 97,
  EM_TPC = 98,
  // Some old picoJava object files use 99 (EM_PJ is correct).
  EM_SNP1K = 99,
  EM_ST200 = 100,
  EM_IP2K = 101,
  EM_MAX = 102,
  EM_CR = 103,
  EM_F2MC16 = 104,
  EM_MSP430 = 105,
  EM_BLACKFIN = 106,
  EM_SE_C33 = 107,
  EM_SEP = 108,
  EM_ARCA = 109,
  EM_UNICORE = 110,
  EM_ALTERA_NIOS2 = 113,
  EM_CRX = 114,
  // The Morph MT.
  EM_MT = 0x2530,
  // DLX.
  EM_DLX = 0x5aa5,
  // FRV.
  EM_FRV = 0x5441,
  // Infineon Technologies 16-bit microcontroller with C166-V2 core.
  EM_X16X = 0x4688,
  // Xstorym16
  EM_XSTORMY16 = 0xad45,
  // Renesas M32C
  EM_M32C = 0xfeb0,
  // Vitesse IQ2000
  EM_IQ2000 = 0xfeba,
  // NIOS
  EM_NIOS32 = 0xfebb
  // Old AVR objects used 0x1057 (EM_AVR is correct).
  // Old MSP430 objects used 0x1059 (EM_MSP430 is correct).
  // Old FR30 objects used 0x3330 (EM_FR30 is correct).
  // Old OpenRISC objects used 0x3426 and 0x8472 (EM_OPENRISC is correct).
  // Old D10V objects used 0x7650 (EM_D10V is correct).
  // Old D30V objects used 0x7676 (EM_D30V is correct).
  // Old IP2X objects used 0x8217 (EM_IP2K is correct).
  // Old PowerPC objects used 0x9025 (EM_PPC is correct).
  // Old Alpha objects used 0x9026 (EM_ALPHA is correct).
  // Old M32R objects used 0x9041 (EM_M32R is correct).
  // Old V850 objects used 0x9080 (EM_V850 is correct).
  // Old S/390 objects used 0xa390 (EM_S390 is correct).
  // Old Xtensa objects used 0xabc7 (EM_XTENSA is correct).
  // Old MN10300 objects used 0xbeef (EM_MN10300 is correct).
  // Old MN10200 objects used 0xdead (EM_MN10200 is correct).
};

// Special section indices.

enum
{
  SHN_UNDEF = 0,
  SHN_LORESERVE = 0xff00,
  SHN_LOPROC = 0xff00,
  SHN_HIPROC = 0xff1f,
  SHN_LOOS = 0xff20,
  SHN_HIOS = 0xff3f,
  SHN_ABS = 0xfff1,
  SHN_COMMON = 0xfff2,
  SHN_XINDEX = 0xffff,
  SHN_HIRESERVE = 0xffff
};

// The valid values found in the Shdr sh_type field.

enum
{
  SHT_NULL = 0,
  SHT_PROGBITS = 1,
  SHT_SYMTAB = 2,
  SHT_STRTAB = 3,
  SHT_RELA = 4,
  SHT_HASH = 5,
  SHT_DYNAMIC = 6,
  SHT_NOTE = 7,
  SHT_NOBITS = 8,
  SHT_REL = 9,
  SHT_SHLIB = 10,
  SHT_DYNSYM = 11,
  SHT_INIT_ARRAY = 14,
  SHT_FINI_ARRAY = 15,
  SHT_PREINIT_ARRAY = 16,
  SHT_GROUP = 17,
  SHT_SYMTAB_SHNDX = 18,
  SHT_LOOS = 0x60000000,
  SHT_HIOS = 0x6fffffff,
  SHT_LOPROC = 0x70000000,
  SHT_HIPROC = 0x7fffffff,
  SHT_LOUSER = 0x80000000,
  SHT_HIUSER = 0xffffffff,
  // The remaining values are not in the standard.
  // List of prelink dependencies.
  SHT_GNU_LIBLIST = 0x6ffffff7,
  // Versions defined by file.
  SHT_SUNW_verdef = 0x6ffffffd,
  SHT_GNU_verdef = 0x6ffffffd,
  // Versions needed by file.
  SHT_SUNW_verneed = 0x6ffffffe,
  SHT_GNU_verneed = 0x6ffffffe,
  // Symbol versions,
  SHT_SUNW_versym = 0x6fffffff,
  SHT_GNU_versym = 0x6fffffff,
};

// The valid bit flags found in the Shdr sh_flags field.

enum
{
  SHF_WRITE = 0x1,
  SHF_ALLOC = 0x2,
  SHF_EXECINSTR = 0x4,
  SHF_MERGE = 0x10,
  SHF_STRINGS = 0x20,
  SHF_INFO_LINK = 0x40,
  SHF_LINK_ORDER = 0x80,
  SHF_OS_NONCONFORMING = 0x100,
  SHF_GROUP = 0x200,
  SHF_TLS = 0x400,
  SHF_MASKOS = 0x0ff00000,
  SHF_MASKPROC = 0xf0000000
};

// Bit flags which appear in the first 32-bit word of the section data
// of a SHT_GROUP section.

enum
{
  GRP_COMDAT = 0x1,
  GRP_MASKOS = 0x0ff00000,
  GRP_MASKPROC = 0xf0000000
};

// Symbol binding from Sym st_info field.

enum STB
{
  STB_LOCAL = 0,
  STB_GLOBAL = 1,
  STB_WEAK = 2,
  STB_LOOS = 10,
  STB_HIOS = 12,
  STB_LOPROC = 13,
  STB_HIPROC = 15
};

// Symbol types from Sym st_info field.

enum STT
{
  STT_NOTYPE = 0,
  STT_OBJECT = 1,
  STT_FUNC = 2,
  STT_SECTION = 3,
  STT_FILE = 4,
  STT_COMMON = 5,
  STT_TLS = 6,
  STT_LOOS = 10,
  STT_HIOS = 12,
  STT_LOPROC = 13,
  STT_HIPROC = 15
};

inline STB
elf_st_bind(unsigned char info)
{
  return static_cast<STB>(info >> 4);
}

inline STT
elf_st_type(unsigned char info)
{
  return static_cast<STT>(info & 0xf);
}

inline unsigned char
elf_st_info(STB bind, STT type)
{
  return ((static_cast<unsigned char>(bind) << 4)
	  + (static_cast<unsigned char>(type) & 0xf));
}

// Symbol visibility from Sym st_other field.

enum STV
{
  STV_DEFAULT = 0,
  STV_INTERNAL = 1,
  STV_HIDDEN = 2,
  STV_PROTECTED = 3
};

inline STV
elf_st_visibility(unsigned char other)
{
  return static_cast<STV>(other & 0x3);
}

inline unsigned char
elf_st_nonvis(unsigned char other)
{
  return static_cast<STV>(other >> 2);
}

inline unsigned char
elf_st_other(STV vis, unsigned char nonvis)
{
  return ((nonvis << 2)
	  + (static_cast<unsigned char>(vis) & 3));
}

} // End namespace elfcpp.

// Include internal details after defining the types.
#include "elfcpp_internal.h"

namespace elfcpp
{

// The offset of the ELF file header in the ELF file.

const int file_header_offset = 0;

// ELF structure sizes.

template<int size>
struct Elf_sizes
{
  // Size of ELF file header.
  static const int ehdr_size = sizeof(internal::Ehdr_data<size>);
  // Size of ELF section header.
  static const int shdr_size = sizeof(internal::Shdr_data<size>);
  // Size of ELF symbol table entry.
  static const int sym_size = sizeof(internal::Sym_data<size>);
};

// Accessor class for the ELF file header.

template<int size, bool big_endian>
class Ehdr
{
 public:
  Ehdr(const unsigned char* p)
    : p_(reinterpret_cast<const internal::Ehdr_data<size>*>(p))
  { }

  const unsigned char*
  get_e_ident() const
  { return this->p_->e_ident; }

  Elf_Half
  get_e_type() const
  { return internal::convert_half<big_endian>(this->p_->e_type); }

  Elf_Half
  get_e_machine() const
  { return internal::convert_half<big_endian>(this->p_->e_machine); }

  Elf_Word
  get_e_version() const
  { return internal::convert_word<big_endian>(this->p_->e_version); }

  typename Elf_types<size>::Elf_Addr
  get_e_entry() const
  { return internal::convert_addr<size, big_endian>(this->p_->e_entry); }

  typename Elf_types<size>::Elf_Off
  get_e_phoff() const
  { return internal::convert_off<size, big_endian>(this->p_->e_phoff); }

  typename Elf_types<size>::Elf_Off
  get_e_shoff() const
  { return internal::convert_off<size, big_endian>(this->p_->e_shoff); }

  Elf_Word
  get_e_flags() const
  { return internal::convert_word<big_endian>(this->p_->e_flags); }

  Elf_Half
  get_e_ehsize() const
  { return internal::convert_half<big_endian>(this->p_->e_ehsize); }

  Elf_Half
  get_e_phentsize() const
  { return internal::convert_half<big_endian>(this->p_->e_phentsize); }

  Elf_Half
  get_e_phnum() const
  { return internal::convert_half<big_endian>(this->p_->e_phnum); }

  Elf_Half
  get_e_shentsize() const
  { return internal::convert_half<big_endian>(this->p_->e_shentsize); }

  Elf_Half
  get_e_shnum() const
  { return internal::convert_half<big_endian>(this->p_->e_shnum); }

  Elf_Half
  get_e_shstrndx() const
  { return internal::convert_half<big_endian>(this->p_->e_shstrndx); }

 private:
  const internal::Ehdr_data<size>* p_;
};

// Accessor class for an ELF section header.

template<int size, bool big_endian>
class Shdr
{
 public:
  Shdr(const unsigned char* p)
    : p_(reinterpret_cast<const internal::Shdr_data<size>*>(p))
  { }

  Elf_Word
  get_sh_name() const
  { return internal::convert_word<big_endian>(this->p_->sh_name); }

  Elf_Word
  get_sh_type() const
  { return internal::convert_word<big_endian>(this->p_->sh_type); }

  typename Elf_types<size>::Elf_WXword
  get_sh_flags() const
  { return internal::convert_wxword<size, big_endian>(this->p_->sh_flags); }

  typename Elf_types<size>::Elf_Addr
  get_sh_addr() const
  { return internal::convert_addr<size, big_endian>(this->p_->sh_addr); }

  typename Elf_types<size>::Elf_Off
  get_sh_offset() const
  { return internal::convert_off<size, big_endian>(this->p_->sh_offset); }

  typename Elf_types<size>::Elf_WXword
  get_sh_size() const
  { return internal::convert_wxword<size, big_endian>(this->p_->sh_size); }

  Elf_Word
  get_sh_link() const
  { return internal::convert_word<big_endian>(this->p_->sh_link); }

  Elf_Word
  get_sh_info() const
  { return internal::convert_word<big_endian>(this->p_->sh_info); }

  typename Elf_types<size>::Elf_WXword
  get_sh_addralign() const
  { return
      internal::convert_wxword<size, big_endian>(this->p_->sh_addralign); }

  typename Elf_types<size>::Elf_WXword
  get_sh_entsize() const
  { return internal::convert_wxword<size, big_endian>(this->p_->sh_entsize); }

 private:
  const internal::Shdr_data<size>* p_;
};

// Accessor class for an ELF symbol table entry.

template<int size, bool big_endian>
class Sym
{
 public:
  Sym(const unsigned char* p)
    : p_(reinterpret_cast<const internal::Sym_data<size>*>(p))
  { }

  Elf_Word
  get_st_name() const
  { return internal::convert_word<big_endian>(this->p_->st_name); }

  typename Elf_types<size>::Elf_Addr
  get_st_value() const
  { return internal::convert_addr<size, big_endian>(this->p_->st_value); }

  typename Elf_types<size>::Elf_WXword
  get_st_size() const
  { return internal::convert_wxword<size, big_endian>(this->p_->st_size); }

  unsigned char
  get_st_info() const
  { return this->p_->st_info; }

  STB
  get_st_bind() const
  { return elf_st_bind(this->get_st_info()); }

  STT
  get_st_type() const
  { return elf_st_type(this->get_st_info()); }

  unsigned char
  get_st_other() const
  { return this->p_->st_other; }

  STV
  get_st_visibility() const
  { return elf_st_visibility(this->get_st_other()); }

  unsigned char
  get_st_nonvis() const
  { return elf_st_nonvis(this->get_st_other()); }

  Elf_Half
  get_st_shndx() const
  { return internal::convert_half<big_endian>(this->p_->st_shndx); }

 private:
  const internal::Sym_data<size>* p_;
};

// Writer class for an ELF symbol table entry.

template<int size, bool big_endian>
class Sym_write
{
 public:
  Sym_write(unsigned char* p)
    : p_(reinterpret_cast<internal::Sym_data<size>*>(p))
  { }

  void
  put_st_name(Elf_Word v)
  { this->p_->st_name = internal::convert_word<big_endian>(v); }

  void
  put_st_value(typename Elf_types<size>::Elf_Addr v)
  { this->p_->st_value = internal::convert_addr<size, big_endian>(v); }

  void
  put_st_size(typename Elf_types<size>::Elf_WXword v)
  { this->p_->st_size = internal::convert_wxword<size, big_endian>(v); }

  void
  put_st_info(unsigned char v)
  { this->p_->st_info = v; }

  void
  put_st_info(STB bind, STT type)
  { this->p_->st_info = elf_st_info(bind, type); }

  void
  put_st_other(unsigned char v)
  { this->p_->st_other = v; }

  void
  put_st_other(STV vis, unsigned char nonvis)
  { this->p_->st_other = elf_st_other(vis, nonvis); }

  void
  put_st_shndx(Elf_Half v)
  { this->p_->st_shndx = internal::convert_half<big_endian>(v); }

  Sym<size, big_endian>
  sym()
  { return Sym<size, big_endian>(reinterpret_cast<unsigned char*>(this->p_)); }

 private:
  internal::Sym_data<size>* p_;
};

} // End namespace elfcpp.

#endif // !defined(ELFPCP_H)