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llvm-6502/include/llvm/Support/ELF.h
Michael J. Spencer cbda61a468 Fix spelling and sort CMakeLists.txt. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132908 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-13 11:11:39 +00:00

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//===-- llvm/Support/ELF.h - ELF constants and data structures --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header contains common, non-processor-specific data structures and
// constants for the ELF file format.
//
// The details of the ELF32 bits in this file are largely based on the Tool
// Interface Standard (TIS) Executable and Linking Format (ELF) Specification
// Version 1.2, May 1995. The ELF64 stuff is based on ELF-64 Object File Format
// Version 1.5, Draft 2, May 1998 as well as OpenBSD header files.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_ELF_H
#define LLVM_SUPPORT_ELF_H
#include "llvm/Support/DataTypes.h"
#include <cstring>
namespace llvm {
namespace ELF {
typedef uint32_t Elf32_Addr; // Program address
typedef uint16_t Elf32_Half;
typedef uint32_t Elf32_Off; // File offset
typedef int32_t Elf32_Sword;
typedef uint32_t Elf32_Word;
typedef uint64_t Elf64_Addr;
typedef uint64_t Elf64_Off;
typedef int32_t Elf64_Shalf;
typedef int32_t Elf64_Sword;
typedef uint32_t Elf64_Word;
typedef int64_t Elf64_Sxword;
typedef uint64_t Elf64_Xword;
typedef uint32_t Elf64_Half;
typedef uint16_t Elf64_Quarter;
// Object file magic string.
static const char ElfMagic[] = { 0x7f, 'E', 'L', 'F', '\0' };
// e_ident size and indices.
enum {
EI_MAG0 = 0, // File identification index.
EI_MAG1 = 1, // File identification index.
EI_MAG2 = 2, // File identification index.
EI_MAG3 = 3, // File identification index.
EI_CLASS = 4, // File class.
EI_DATA = 5, // Data encoding.
EI_VERSION = 6, // File version.
EI_OSABI = 7, // OS/ABI identification.
EI_ABIVERSION = 8, // ABI version.
EI_PAD = 9, // Start of padding bytes.
EI_NIDENT = 16 // Number of bytes in e_ident.
};
struct Elf32_Ehdr {
unsigned char e_ident[EI_NIDENT]; // ELF Identification bytes
Elf32_Half e_type; // Type of file (see ET_* below)
Elf32_Half e_machine; // Required architecture for this file (see EM_*)
Elf32_Word e_version; // Must be equal to 1
Elf32_Addr e_entry; // Address to jump to in order to start program
Elf32_Off e_phoff; // Program header table's file offset, in bytes
Elf32_Off e_shoff; // Section header table's file offset, in bytes
Elf32_Word e_flags; // Processor-specific flags
Elf32_Half e_ehsize; // Size of ELF header, in bytes
Elf32_Half e_phentsize; // Size of an entry in the program header table
Elf32_Half e_phnum; // Number of entries in the program header table
Elf32_Half e_shentsize; // Size of an entry in the section header table
Elf32_Half e_shnum; // Number of entries in the section header table
Elf32_Half e_shstrndx; // Sect hdr table index of sect name string table
bool checkMagic() const {
return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
}
unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
};
// 64-bit ELF header. Fields are the same as for ELF32, but with different
// types (see above).
struct Elf64_Ehdr {
unsigned char e_ident[EI_NIDENT];
Elf64_Quarter e_type;
Elf64_Quarter e_machine;
Elf64_Half e_version;
Elf64_Addr e_entry;
Elf64_Off e_phoff;
Elf64_Off e_shoff;
Elf64_Half e_flags;
Elf64_Quarter e_ehsize;
Elf64_Quarter e_phentsize;
Elf64_Quarter e_phnum;
Elf64_Quarter e_shentsize;
Elf64_Quarter e_shnum;
Elf64_Quarter e_shstrndx;
bool checkMagic() const {
return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
}
unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
};
// File types
enum {
ET_NONE = 0, // No file type
ET_REL = 1, // Relocatable file
ET_EXEC = 2, // Executable file
ET_DYN = 3, // Shared object file
ET_CORE = 4, // Core file
ET_LOPROC = 0xff00, // Beginning of processor-specific codes
ET_HIPROC = 0xffff // Processor-specific
};
// Versioning
enum {
EV_NONE = 0,
EV_CURRENT = 1
};
// Machine architectures
enum {
EM_NONE = 0, // No machine
EM_M32 = 1, // AT&T WE 32100
EM_SPARC = 2, // SPARC
EM_386 = 3, // Intel 386
EM_68K = 4, // Motorola 68000
EM_88K = 5, // Motorola 88000
EM_486 = 6, // Intel 486 (deprecated)
EM_860 = 7, // Intel 80860
EM_MIPS = 8, // MIPS R3000
EM_PPC = 20, // PowerPC
EM_PPC64 = 21, // PowerPC64
EM_ARM = 40, // ARM
EM_ALPHA = 41, // DEC Alpha
EM_SPARCV9 = 43, // SPARC V9
EM_X86_64 = 62, // AMD64
EM_MBLAZE = 47787 // Xilinx MicroBlaze
};
// Object file classes.
enum {
ELFCLASSNONE = 0,
ELFCLASS32 = 1, // 32-bit object file
ELFCLASS64 = 2 // 64-bit object file
};
// Object file byte orderings.
enum {
ELFDATANONE = 0, // Invalid data encoding.
ELFDATA2LSB = 1, // Little-endian object file
ELFDATA2MSB = 2 // Big-endian object file
};
// OS ABI identification.
enum {
ELFOSABI_NONE = 0, // UNIX System V ABI
ELFOSABI_HPUX = 1, // HP-UX operating system
ELFOSABI_NETBSD = 2, // NetBSD
ELFOSABI_LINUX = 3, // GNU/Linux
ELFOSABI_HURD = 4, // GNU/Hurd
ELFOSABI_SOLARIS = 6, // Solaris
ELFOSABI_AIX = 7, // AIX
ELFOSABI_IRIX = 8, // IRIX
ELFOSABI_FREEBSD = 9, // FreeBSD
ELFOSABI_TRU64 = 10, // TRU64 UNIX
ELFOSABI_MODESTO = 11, // Novell Modesto
ELFOSABI_OPENBSD = 12, // OpenBSD
ELFOSABI_OPENVMS = 13, // OpenVMS
ELFOSABI_NSK = 14, // Hewlett-Packard Non-Stop Kernel
ELFOSABI_AROS = 15, // AROS
ELFOSABI_FENIXOS = 16, // FenixOS
ELFOSABI_C6000_ELFABI = 64, // Bare-metal TMS320C6000
ELFOSABI_C6000_LINUX = 65, // Linux TMS320C6000
ELFOSABI_ARM = 97, // ARM
ELFOSABI_STANDALONE = 255 // Standalone (embedded) application
};
// X86_64 relocations.
enum {
R_X86_64_NONE = 0,
R_X86_64_64 = 1,
R_X86_64_PC32 = 2,
R_X86_64_GOT32 = 3,
R_X86_64_PLT32 = 4,
R_X86_64_COPY = 5,
R_X86_64_GLOB_DAT = 6,
R_X86_64_JUMP_SLOT = 7,
R_X86_64_RELATIVE = 8,
R_X86_64_GOTPCREL = 9,
R_X86_64_32 = 10,
R_X86_64_32S = 11,
R_X86_64_16 = 12,
R_X86_64_PC16 = 13,
R_X86_64_8 = 14,
R_X86_64_PC8 = 15,
R_X86_64_DTPMOD64 = 16,
R_X86_64_DTPOFF64 = 17,
R_X86_64_TPOFF64 = 18,
R_X86_64_TLSGD = 19,
R_X86_64_TLSLD = 20,
R_X86_64_DTPOFF32 = 21,
R_X86_64_GOTTPOFF = 22,
R_X86_64_TPOFF32 = 23,
R_X86_64_PC64 = 24,
R_X86_64_GOTOFF64 = 25,
R_X86_64_GOTPC32 = 26,
R_X86_64_SIZE32 = 32,
R_X86_64_SIZE64 = 33,
R_X86_64_GOTPC32_TLSDESC = 34,
R_X86_64_TLSDESC_CALL = 35,
R_X86_64_TLSDESC = 36
};
// i386 relocations.
// TODO: this is just a subset
enum {
R_386_NONE = 0,
R_386_32 = 1,
R_386_PC32 = 2,
R_386_GOT32 = 3,
R_386_PLT32 = 4,
R_386_COPY = 5,
R_386_GLOB_DAT = 6,
R_386_JUMP_SLOT = 7,
R_386_RELATIVE = 8,
R_386_GOTOFF = 9,
R_386_GOTPC = 10,
R_386_32PLT = 11,
R_386_TLS_TPOFF = 14,
R_386_TLS_IE = 15,
R_386_TLS_GOTIE = 16,
R_386_TLS_LE = 17,
R_386_TLS_GD = 18,
R_386_TLS_LDM = 19,
R_386_16 = 20,
R_386_PC16 = 21,
R_386_8 = 22,
R_386_PC8 = 23,
R_386_TLS_GD_32 = 24,
R_386_TLS_GD_PUSH = 25,
R_386_TLS_GD_CALL = 26,
R_386_TLS_GD_POP = 27,
R_386_TLS_LDM_32 = 28,
R_386_TLS_LDM_PUSH = 29,
R_386_TLS_LDM_CALL = 30,
R_386_TLS_LDM_POP = 31,
R_386_TLS_LDO_32 = 32,
R_386_TLS_IE_32 = 33,
R_386_TLS_LE_32 = 34,
R_386_TLS_DTPMOD32 = 35,
R_386_TLS_DTPOFF32 = 36,
R_386_TLS_TPOFF32 = 37,
R_386_TLS_GOTDESC = 39,
R_386_TLS_DESC_CALL = 40,
R_386_TLS_DESC = 41,
R_386_IRELATIVE = 42,
R_386_NUM = 43
};
// MBlaze relocations.
enum {
R_MICROBLAZE_NONE = 0,
R_MICROBLAZE_32 = 1,
R_MICROBLAZE_32_PCREL = 2,
R_MICROBLAZE_64_PCREL = 3,
R_MICROBLAZE_32_PCREL_LO = 4,
R_MICROBLAZE_64 = 5,
R_MICROBLAZE_32_LO = 6,
R_MICROBLAZE_SRO32 = 7,
R_MICROBLAZE_SRW32 = 8,
R_MICROBLAZE_64_NONE = 9,
R_MICROBLAZE_32_SYM_OP_SYM = 10,
R_MICROBLAZE_GNU_VTINHERIT = 11,
R_MICROBLAZE_GNU_VTENTRY = 12,
R_MICROBLAZE_GOTPC_64 = 13,
R_MICROBLAZE_GOT_64 = 14,
R_MICROBLAZE_PLT_64 = 15,
R_MICROBLAZE_REL = 16,
R_MICROBLAZE_JUMP_SLOT = 17,
R_MICROBLAZE_GLOB_DAT = 18,
R_MICROBLAZE_GOTOFF_64 = 19,
R_MICROBLAZE_GOTOFF_32 = 20,
R_MICROBLAZE_COPY = 21
};
// ARM Specific e_flags
enum { EF_ARM_EABIMASK = 0xFF000000U };
// ELF Relocation types for ARM
// Meets 2.08 ABI Specs.
enum {
R_ARM_NONE = 0x00,
R_ARM_PC24 = 0x01,
R_ARM_ABS32 = 0x02,
R_ARM_REL32 = 0x03,
R_ARM_LDR_PC_G0 = 0x04,
R_ARM_ABS16 = 0x05,
R_ARM_ABS12 = 0x06,
R_ARM_THM_ABS5 = 0x07,
R_ARM_ABS8 = 0x08,
R_ARM_SBREL32 = 0x09,
R_ARM_THM_CALL = 0x0a,
R_ARM_THM_PC8 = 0x0b,
R_ARM_BREL_ADJ = 0x0c,
R_ARM_TLS_DESC = 0x0d,
R_ARM_THM_SWI8 = 0x0e,
R_ARM_XPC25 = 0x0f,
R_ARM_THM_XPC22 = 0x10,
R_ARM_TLS_DTPMOD32 = 0x11,
R_ARM_TLS_DTPOFF32 = 0x12,
R_ARM_TLS_TPOFF32 = 0x13,
R_ARM_COPY = 0x14,
R_ARM_GLOB_DAT = 0x15,
R_ARM_JUMP_SLOT = 0x16,
R_ARM_RELATIVE = 0x17,
R_ARM_GOTOFF32 = 0x18,
R_ARM_BASE_PREL = 0x19,
R_ARM_GOT_BREL = 0x1a,
R_ARM_PLT32 = 0x1b,
R_ARM_CALL = 0x1c,
R_ARM_JUMP24 = 0x1d,
R_ARM_THM_JUMP24 = 0x1e,
R_ARM_BASE_ABS = 0x1f,
R_ARM_ALU_PCREL_7_0 = 0x20,
R_ARM_ALU_PCREL_15_8 = 0x21,
R_ARM_ALU_PCREL_23_15 = 0x22,
R_ARM_LDR_SBREL_11_0_NC = 0x23,
R_ARM_ALU_SBREL_19_12_NC = 0x24,
R_ARM_ALU_SBREL_27_20_CK = 0x25,
R_ARM_TARGET1 = 0x26,
R_ARM_SBREL31 = 0x27,
R_ARM_V4BX = 0x28,
R_ARM_TARGET2 = 0x29,
R_ARM_PREL31 = 0x2a,
R_ARM_MOVW_ABS_NC = 0x2b,
R_ARM_MOVT_ABS = 0x2c,
R_ARM_MOVW_PREL_NC = 0x2d,
R_ARM_MOVT_PREL = 0x2e,
R_ARM_THM_MOVW_ABS_NC = 0x2f,
R_ARM_THM_MOVT_ABS = 0x30,
R_ARM_THM_MOVW_PREL_NC = 0x31,
R_ARM_THM_MOVT_PREL = 0x32,
R_ARM_THM_JUMP19 = 0x33,
R_ARM_THM_JUMP6 = 0x34,
R_ARM_THM_ALU_PREL_11_0 = 0x35,
R_ARM_THM_PC12 = 0x36,
R_ARM_ABS32_NOI = 0x37,
R_ARM_REL32_NOI = 0x38,
R_ARM_ALU_PC_G0_NC = 0x39,
R_ARM_ALU_PC_G0 = 0x3a,
R_ARM_ALU_PC_G1_NC = 0x3b,
R_ARM_ALU_PC_G1 = 0x3c,
R_ARM_ALU_PC_G2 = 0x3d,
R_ARM_LDR_PC_G1 = 0x3e,
R_ARM_LDR_PC_G2 = 0x3f,
R_ARM_LDRS_PC_G0 = 0x40,
R_ARM_LDRS_PC_G1 = 0x41,
R_ARM_LDRS_PC_G2 = 0x42,
R_ARM_LDC_PC_G0 = 0x43,
R_ARM_LDC_PC_G1 = 0x44,
R_ARM_LDC_PC_G2 = 0x45,
R_ARM_ALU_SB_G0_NC = 0x46,
R_ARM_ALU_SB_G0 = 0x47,
R_ARM_ALU_SB_G1_NC = 0x48,
R_ARM_ALU_SB_G1 = 0x49,
R_ARM_ALU_SB_G2 = 0x4a,
R_ARM_LDR_SB_G0 = 0x4b,
R_ARM_LDR_SB_G1 = 0x4c,
R_ARM_LDR_SB_G2 = 0x4d,
R_ARM_LDRS_SB_G0 = 0x4e,
R_ARM_LDRS_SB_G1 = 0x4f,
R_ARM_LDRS_SB_G2 = 0x50,
R_ARM_LDC_SB_G0 = 0x51,
R_ARM_LDC_SB_G1 = 0x52,
R_ARM_LDC_SB_G2 = 0x53,
R_ARM_MOVW_BREL_NC = 0x54,
R_ARM_MOVT_BREL = 0x55,
R_ARM_MOVW_BREL = 0x56,
R_ARM_THM_MOVW_BREL_NC = 0x57,
R_ARM_THM_MOVT_BREL = 0x58,
R_ARM_THM_MOVW_BREL = 0x59,
R_ARM_TLS_GOTDESC = 0x5a,
R_ARM_TLS_CALL = 0x5b,
R_ARM_TLS_DESCSEQ = 0x5c,
R_ARM_THM_TLS_CALL = 0x5d,
R_ARM_PLT32_ABS = 0x5e,
R_ARM_GOT_ABS = 0x5f,
R_ARM_GOT_PREL = 0x60,
R_ARM_GOT_BREL12 = 0x61,
R_ARM_GOTOFF12 = 0x62,
R_ARM_GOTRELAX = 0x63,
R_ARM_GNU_VTENTRY = 0x64,
R_ARM_GNU_VTINHERIT = 0x65,
R_ARM_THM_JUMP11 = 0x66,
R_ARM_THM_JUMP8 = 0x67,
R_ARM_TLS_GD32 = 0x68,
R_ARM_TLS_LDM32 = 0x69,
R_ARM_TLS_LDO32 = 0x6a,
R_ARM_TLS_IE32 = 0x6b,
R_ARM_TLS_LE32 = 0x6c,
R_ARM_TLS_LDO12 = 0x6d,
R_ARM_TLS_LE12 = 0x6e,
R_ARM_TLS_IE12GP = 0x6f,
R_ARM_PRIVATE_0 = 0x70,
R_ARM_PRIVATE_1 = 0x71,
R_ARM_PRIVATE_2 = 0x72,
R_ARM_PRIVATE_3 = 0x73,
R_ARM_PRIVATE_4 = 0x74,
R_ARM_PRIVATE_5 = 0x75,
R_ARM_PRIVATE_6 = 0x76,
R_ARM_PRIVATE_7 = 0x77,
R_ARM_PRIVATE_8 = 0x78,
R_ARM_PRIVATE_9 = 0x79,
R_ARM_PRIVATE_10 = 0x7a,
R_ARM_PRIVATE_11 = 0x7b,
R_ARM_PRIVATE_12 = 0x7c,
R_ARM_PRIVATE_13 = 0x7d,
R_ARM_PRIVATE_14 = 0x7e,
R_ARM_PRIVATE_15 = 0x7f,
R_ARM_ME_TOO = 0x80,
R_ARM_THM_TLS_DESCSEQ16 = 0x81,
R_ARM_THM_TLS_DESCSEQ32 = 0x82
};
// Section header.
struct Elf32_Shdr {
Elf32_Word sh_name; // Section name (index into string table)
Elf32_Word sh_type; // Section type (SHT_*)
Elf32_Word sh_flags; // Section flags (SHF_*)
Elf32_Addr sh_addr; // Address where section is to be loaded
Elf32_Off sh_offset; // File offset of section data, in bytes
Elf32_Word sh_size; // Size of section, in bytes
Elf32_Word sh_link; // Section type-specific header table index link
Elf32_Word sh_info; // Section type-specific extra information
Elf32_Word sh_addralign; // Section address alignment
Elf32_Word sh_entsize; // Size of records contained within the section
};
// Section header for ELF64 - same fields as ELF32, different types.
struct Elf64_Shdr {
Elf64_Half sh_name;
Elf64_Half sh_type;
Elf64_Xword sh_flags;
Elf64_Addr sh_addr;
Elf64_Off sh_offset;
Elf64_Xword sh_size;
Elf64_Half sh_link;
Elf64_Half sh_info;
Elf64_Xword sh_addralign;
Elf64_Xword sh_entsize;
};
// Special section indices.
enum {
SHN_UNDEF = 0, // Undefined, missing, irrelevant, or meaningless
SHN_LORESERVE = 0xff00, // Lowest reserved index
SHN_LOPROC = 0xff00, // Lowest processor-specific index
SHN_HIPROC = 0xff1f, // Highest processor-specific index
SHN_ABS = 0xfff1, // Symbol has absolute value; does not need relocation
SHN_COMMON = 0xfff2, // FORTRAN COMMON or C external global variables
SHN_XINDEX = 0xffff, // Mark that the index is >= SHN_LORESERVE
SHN_HIRESERVE = 0xffff // Highest reserved index
};
// Section types.
enum {
SHT_NULL = 0, // No associated section (inactive entry).
SHT_PROGBITS = 1, // Program-defined contents.
SHT_SYMTAB = 2, // Symbol table.
SHT_STRTAB = 3, // String table.
SHT_RELA = 4, // Relocation entries; explicit addends.
SHT_HASH = 5, // Symbol hash table.
SHT_DYNAMIC = 6, // Information for dynamic linking.
SHT_NOTE = 7, // Information about the file.
SHT_NOBITS = 8, // Data occupies no space in the file.
SHT_REL = 9, // Relocation entries; no explicit addends.
SHT_SHLIB = 10, // Reserved.
SHT_DYNSYM = 11, // Symbol table.
SHT_INIT_ARRAY = 14, // Pointers to initialization functions.
SHT_FINI_ARRAY = 15, // Pointers to termination functions.
SHT_PREINIT_ARRAY = 16, // Pointers to pre-init functions.
SHT_GROUP = 17, // Section group.
SHT_SYMTAB_SHNDX = 18, // Indices for SHN_XINDEX entries.
SHT_LOOS = 0x60000000, // Lowest operating system-specific type.
SHT_HIOS = 0x6fffffff, // Highest operating system-specific type.
SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type.
// Fixme: All this is duplicated in MCSectionELF. Why??
// Exception Index table
SHT_ARM_EXIDX = 0x70000001U,
// BPABI DLL dynamic linking pre-emption map
SHT_ARM_PREEMPTMAP = 0x70000002U,
// Object file compatibility attributes
SHT_ARM_ATTRIBUTES = 0x70000003U,
SHT_ARM_DEBUGOVERLAY = 0x70000004U,
SHT_ARM_OVERLAYSECTION = 0x70000005U,
SHT_X86_64_UNWIND = 0x70000001, // Unwind information
SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type.
SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
};
// Section flags.
enum {
// Section data should be writable during execution.
SHF_WRITE = 0x1,
// Section occupies memory during program execution.
SHF_ALLOC = 0x2,
// Section contains executable machine instructions.
SHF_EXECINSTR = 0x4,
// The data in this section may be merged.
SHF_MERGE = 0x10,
// The data in this section is null-terminated strings.
SHF_STRINGS = 0x20,
// A field in this section holds a section header table index.
SHF_INFO_LINK = 0x40U,
// Adds special ordering requirements for link editors.
SHF_LINK_ORDER = 0x80U,
// This section requires special OS-specific processing to avoid incorrect
// behavior.
SHF_OS_NONCONFORMING = 0x100U,
// This section is a member of a section group.
SHF_GROUP = 0x200U,
// This section holds Thread-Local Storage.
SHF_TLS = 0x400U,
// Start of target-specific flags.
/// XCORE_SHF_CP_SECTION - All sections with the "c" flag are grouped
/// together by the linker to form the constant pool and the cp register is
/// set to the start of the constant pool by the boot code.
XCORE_SHF_CP_SECTION = 0x800U,
/// XCORE_SHF_DP_SECTION - All sections with the "d" flag are grouped
/// together by the linker to form the data section and the dp register is
/// set to the start of the section by the boot code.
XCORE_SHF_DP_SECTION = 0x1000U,
// Bits indicating processor-specific flags.
SHF_MASKPROC = 0xf0000000
};
// Section Group Flags
enum {
GRP_COMDAT = 0x1,
GRP_MASKOS = 0x0ff00000,
GRP_MASKPROC = 0xf0000000
};
// Symbol table entries for ELF32.
struct Elf32_Sym {
Elf32_Word st_name; // Symbol name (index into string table)
Elf32_Addr st_value; // Value or address associated with the symbol
Elf32_Word st_size; // Size of the symbol
unsigned char st_info; // Symbol's type and binding attributes
unsigned char st_other; // Must be zero; reserved
Elf32_Half st_shndx; // Which section (header table index) it's defined in
// These accessors and mutators correspond to the ELF32_ST_BIND,
// ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification:
unsigned char getBinding() const { return st_info >> 4; }
unsigned char getType() const { return st_info & 0x0f; }
void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
void setBindingAndType(unsigned char b, unsigned char t) {
st_info = (b << 4) + (t & 0x0f);
}
};
// Symbol table entries for ELF64.
struct Elf64_Sym {
Elf64_Word st_name; // Symbol name (index into string table)
unsigned char st_info; // Symbol's type and binding attributes
unsigned char st_other; // Must be zero; reserved
Elf64_Half st_shndx; // Which section (header table index) it's defined in
Elf64_Addr st_value; // Value or address associated with the symbol
Elf64_Xword st_size; // Size of the symbol
// These accessors and mutators are identical to those defined for ELF32
// symbol table entries.
unsigned char getBinding() const { return st_info >> 4; }
unsigned char getType() const { return st_info & 0x0f; }
void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
void setBindingAndType(unsigned char b, unsigned char t) {
st_info = (b << 4) + (t & 0x0f);
}
};
// The size (in bytes) of symbol table entries.
enum {
SYMENTRY_SIZE32 = 16, // 32-bit symbol entry size
SYMENTRY_SIZE64 = 24 // 64-bit symbol entry size.
};
// Symbol bindings.
enum {
STB_LOCAL = 0, // Local symbol, not visible outside obj file containing def
STB_GLOBAL = 1, // Global symbol, visible to all object files being combined
STB_WEAK = 2, // Weak symbol, like global but lower-precedence
STB_LOPROC = 13, // Lowest processor-specific binding type
STB_HIPROC = 15 // Highest processor-specific binding type
};
// Symbol types.
enum {
STT_NOTYPE = 0, // Symbol's type is not specified
STT_OBJECT = 1, // Symbol is a data object (variable, array, etc.)
STT_FUNC = 2, // Symbol is executable code (function, etc.)
STT_SECTION = 3, // Symbol refers to a section
STT_FILE = 4, // Local, absolute symbol that refers to a file
STT_COMMON = 5, // An uninitialized common block
STT_TLS = 6, // Thread local data object
STT_LOPROC = 13, // Lowest processor-specific symbol type
STT_HIPROC = 15 // Highest processor-specific symbol type
};
enum {
STV_DEFAULT = 0, // Visibility is specified by binding type
STV_INTERNAL = 1, // Defined by processor supplements
STV_HIDDEN = 2, // Not visible to other components
STV_PROTECTED = 3 // Visible in other components but not preemptable
};
// Relocation entry, without explicit addend.
struct Elf32_Rel {
Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
Elf32_Word r_info; // Symbol table index and type of relocation to apply
// These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
// and ELF32_R_INFO macros defined in the ELF specification:
Elf32_Word getSymbol() const { return (r_info >> 8); }
unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); }
void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf32_Word s, unsigned char t) {
r_info = (s << 8) + t;
}
};
// Relocation entry with explicit addend.
struct Elf32_Rela {
Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
Elf32_Word r_info; // Symbol table index and type of relocation to apply
Elf32_Sword r_addend; // Compute value for relocatable field by adding this
// These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
// and ELF32_R_INFO macros defined in the ELF specification:
Elf32_Word getSymbol() const { return (r_info >> 8); }
unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); }
void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf32_Word s, unsigned char t) {
r_info = (s << 8) + t;
}
};
// Relocation entry, without explicit addend.
struct Elf64_Rel {
Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
Elf64_Xword r_info; // Symbol table index and type of relocation to apply.
// These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
// and ELF64_R_INFO macros defined in the ELF specification:
Elf64_Xword getSymbol() const { return (r_info >> 32); }
unsigned char getType() const {
return (unsigned char) (r_info & 0xffffffffL);
}
void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf64_Xword s, unsigned char t) {
r_info = (s << 32) + (t&0xffffffffL);
}
};
// Relocation entry with explicit addend.
struct Elf64_Rela {
Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
Elf64_Xword r_info; // Symbol table index and type of relocation to apply.
Elf64_Sxword r_addend; // Compute value for relocatable field by adding this.
// These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
// and ELF64_R_INFO macros defined in the ELF specification:
Elf64_Xword getSymbol() const { return (r_info >> 32); }
unsigned char getType() const {
return (unsigned char) (r_info & 0xffffffffL);
}
void setSymbol(Elf64_Xword s) { setSymbolAndType(s, getType()); }
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf64_Xword s, unsigned char t) {
r_info = (s << 32) + (t&0xffffffffL);
}
};
// Program header for ELF32.
struct Elf32_Phdr {
Elf32_Word p_type; // Type of segment
Elf32_Off p_offset; // File offset where segment is located, in bytes
Elf32_Addr p_vaddr; // Virtual address of beginning of segment
Elf32_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
Elf32_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
Elf32_Word p_memsz; // Num. of bytes in mem image of segment (may be zero)
Elf32_Word p_flags; // Segment flags
Elf32_Word p_align; // Segment alignment constraint
};
// Program header for ELF64.
struct Elf64_Phdr {
Elf64_Word p_type; // Type of segment
Elf64_Word p_flags; // Segment flags
Elf64_Off p_offset; // File offset where segment is located, in bytes
Elf64_Addr p_vaddr; // Virtual address of beginning of segment
Elf64_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
Elf64_Xword p_filesz; // Num. of bytes in file image of segment (may be zero)
Elf64_Xword p_memsz; // Num. of bytes in mem image of segment (may be zero)
Elf64_Xword p_align; // Segment alignment constraint
};
// Segment types.
enum {
PT_NULL = 0, // Unused segment.
PT_LOAD = 1, // Loadable segment.
PT_DYNAMIC = 2, // Dynamic linking information.
PT_INTERP = 3, // Interpreter pathname.
PT_NOTE = 4, // Auxiliary information.
PT_SHLIB = 5, // Reserved.
PT_PHDR = 6, // The program header table itself.
PT_LOPROC = 0x70000000, // Lowest processor-specific program hdr entry type.
PT_HIPROC = 0x7fffffff // Highest processor-specific program hdr entry type.
};
// Segment flag bits.
enum {
PF_X = 1, // Execute
PF_W = 2, // Write
PF_R = 4, // Read
PF_MASKPROC = 0xf0000000 // Unspecified
};
// Dynamic table entry for ELF32.
struct Elf32_Dyn
{
Elf32_Sword d_tag; // Type of dynamic table entry.
union
{
Elf32_Word d_val; // Integer value of entry.
Elf32_Addr d_ptr; // Pointer value of entry.
} d_un;
};
// Dynamic table entry for ELF64.
struct Elf64_Dyn
{
Elf64_Sxword d_tag; // Type of dynamic table entry.
union
{
Elf64_Xword d_val; // Integer value of entry.
Elf64_Addr d_ptr; // Pointer value of entry.
} d_un;
};
// Dynamic table entry tags.
enum {
DT_NULL = 0, // Marks end of dynamic array.
DT_NEEDED = 1, // String table offset of needed library.
DT_PLTRELSZ = 2, // Size of relocation entries in PLT.
DT_PLTGOT = 3, // Address associated with linkage table.
DT_HASH = 4, // Address of symbolic hash table.
DT_STRTAB = 5, // Address of dynamic string table.
DT_SYMTAB = 6, // Address of dynamic symbol table.
DT_RELA = 7, // Address of relocation table (Rela entries).
DT_RELASZ = 8, // Size of Rela relocation table.
DT_RELAENT = 9, // Size of a Rela relocation entry.
DT_STRSZ = 10, // Total size of the string table.
DT_SYMENT = 11, // Size of a symbol table entry.
DT_INIT = 12, // Address of initialization function.
DT_FINI = 13, // Address of termination function.
DT_SONAME = 14, // String table offset of a shared objects name.
DT_RPATH = 15, // String table offset of library search path.
DT_SYMBOLIC = 16, // Changes symbol resolution algorithm.
DT_REL = 17, // Address of relocation table (Rel entries).
DT_RELSZ = 18, // Size of Rel relocation table.
DT_RELENT = 19, // Size of a Rel relocation entry.
DT_PLTREL = 20, // Type of relocation entry used for linking.
DT_DEBUG = 21, // Reserved for debugger.
DT_TEXTREL = 22, // Relocations exist for non-writable segments.
DT_JMPREL = 23, // Address of relocations associated with PLT.
DT_BIND_NOW = 24, // Process all relocations before execution.
DT_INIT_ARRAY = 25, // Pointer to array of initialization functions.
DT_FINI_ARRAY = 26, // Pointer to array of termination functions.
DT_INIT_ARRAYSZ = 27, // Size of DT_INIT_ARRAY.
DT_FINI_ARRAYSZ = 28, // Size of DT_FINI_ARRAY.
DT_LOOS = 0x60000000, // Start of environment specific tags.
DT_HIOS = 0x6FFFFFFF, // End of environment specific tags.
DT_LOPROC = 0x70000000, // Start of processor specific tags.
DT_HIPROC = 0x7FFFFFFF // End of processor specific tags.
};
} // end namespace ELF
} // end namespace llvm
#endif
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