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296 lines
11 KiB
C++
296 lines
11 KiB
C++
//===-- Support/ELF.h - ELF constants and data structures -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header contains common, non-processor-specific data structures and
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// constants for the ELF file format.
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//
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// The details of the ELF32 bits in this file are largely based on
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// the Tool Interface Standard (TIS) Executable and Linking Format
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// (ELF) Specification Version 1.2, May 1995. The ELF64 stuff is not
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// standardized, as far as I can tell. It was largely based on information
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// I found in OpenBSD header files.
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//
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//===----------------------------------------------------------------------===//
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#include "Support/DataTypes.h"
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#include <cstring>
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#include <cstdlib>
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namespace llvm {
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namespace ELF {
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typedef uint32_t Elf32_Addr; // Program address
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typedef uint16_t Elf32_Half;
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typedef uint32_t Elf32_Off; // File offset
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typedef int32_t Elf32_Sword;
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typedef uint32_t Elf32_Word;
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typedef uint64_t Elf64_Addr;
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typedef uint64_t Elf64_Off;
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typedef int32_t Elf64_Shalf;
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typedef int32_t Elf64_Sword;
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typedef uint32_t Elf64_Word;
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typedef int64_t Elf64_Sxword;
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typedef uint64_t Elf64_Xword;
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typedef uint32_t Elf64_Half;
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typedef uint16_t Elf64_Quarter;
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// Object file magic string.
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static const char ElfMagic[] = { 0x7f, 'E', 'L', 'F', '\0' };
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struct Elf32_Ehdr {
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unsigned char e_ident[16]; // ELF Identification bytes
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Elf32_Half e_type; // Type of file (see ET_* below)
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Elf32_Half e_machine; // Required architecture for this file (see EM_*)
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Elf32_Word e_version; // Must be equal to 1
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Elf32_Addr e_entry; // Address to jump to in order to start program
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Elf32_Off e_phoff; // Program header table's file offset, in bytes
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Elf32_Off e_shoff; // Section header table's file offset, in bytes
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Elf32_Word e_flags; // Processor-specific flags
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Elf32_Half e_ehsize; // Size of ELF header, in bytes
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Elf32_Half e_phentsize; // Size of an entry in the program header table
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Elf32_Half e_phnum; // Number of entries in the program header table
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Elf32_Half e_shentsize; // Size of an entry in the section header table
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Elf32_Half e_shnum; // Number of entries in the section header table
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Elf32_Half e_shstrndx; // Sect hdr table index of sect name string table
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bool checkMagic () const {
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return (memcmp (e_ident, ElfMagic, strlen (ElfMagic))) == 0;
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}
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unsigned char getFileClass () const { return e_ident[4]; }
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unsigned char getDataEncoding () { return e_ident[5]; }
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};
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// 64-bit ELF header. Fields are the same as for ELF32, but with different
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// types (see above).
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struct Elf64_Ehdr {
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unsigned char e_ident[16];
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Elf64_Quarter e_type;
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Elf64_Quarter e_machine;
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Elf64_Half e_version;
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Elf64_Addr e_entry;
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Elf64_Off e_phoff;
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Elf64_Off e_shoff;
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Elf64_Half e_flags;
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Elf64_Quarter e_ehsize;
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Elf64_Quarter e_phentsize;
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Elf64_Quarter e_phnum;
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Elf64_Quarter e_shentsize;
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Elf64_Quarter e_shnum;
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Elf64_Quarter e_shstrndx;
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};
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// File types
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enum {
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ET_NONE = 0, // No file type
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ET_REL = 1, // Relocatable file
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ET_EXEC = 2, // Executable file
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ET_DYN = 3, // Shared object file
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ET_CORE = 4, // Core file
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ET_LOPROC = 0xff00, // Beginning of processor-specific codes
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ET_HIPROC = 0xffff // Processor-specific
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};
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// Machine architectures
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enum {
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EM_NONE = 0, // No machine
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EM_M32 = 1, // AT&T WE 32100
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EM_SPARC = 2, // SPARC
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EM_386 = 3, // Intel 386
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EM_68K = 4, // Motorola 68000
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EM_88K = 5, // Motorola 88000
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EM_486 = 6, // Intel 486 (deprecated)
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EM_860 = 7, // Intel 80860
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EM_MIPS = 8, // MIPS R3000
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EM_PPC = 20, // PowerPC
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EM_ARM = 40, // ARM
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EM_ALPHA = 41, // DEC Alpha
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EM_SPARCV9 = 43 // SPARC V9
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};
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// Object file classes.
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enum {
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ELFCLASS32 = 1, // 32-bit object file
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ELFCLASS64 = 2 // 64-bit object file
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};
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// Object file byte orderings.
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enum {
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ELFDATA2LSB = 1, // Little-endian object file
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ELFDATA2MSB = 2 // Big-endian object file
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};
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// Section header.
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struct Elf32_Shdr {
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Elf32_Word sh_name; // Section name (index into string table)
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Elf32_Word sh_type; // Section type (SHT_*)
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Elf32_Word sh_flags; // Section flags (SHF_*)
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Elf32_Addr sh_addr; // Address where section is to be loaded
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Elf32_Off sh_offset; // File offset of section data, in bytes
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Elf32_Word sh_size; // Size of section, in bytes
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Elf32_Word sh_link; // Section type-specific header table index link
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Elf32_Word sh_info; // Section type-specific extra information
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Elf32_Word sh_addralign; // Section address alignment
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Elf32_Word sh_entsize; // Size of records contained within the section
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};
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// Section header for ELF64 - same fields as ELF32, different types.
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struct Elf64_Shdr {
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Elf64_Half sh_name;
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Elf64_Half sh_type;
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Elf64_Xword sh_flags;
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Elf64_Addr sh_addr;
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Elf64_Off sh_offset;
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Elf64_Xword sh_size;
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Elf64_Half sh_link;
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Elf64_Half sh_info;
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Elf64_Xword sh_addralign;
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Elf64_Xword sh_entsize;
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};
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// Special section indices.
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enum {
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SHN_UNDEF = 0, // Undefined, missing, irrelevant, or meaningless
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SHN_LORESERVE = 0xff00, // Lowest reserved index
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SHN_LOPROC = 0xff00, // Lowest processor-specific index
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SHN_HIPROC = 0xff1f, // Highest processor-specific index
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SHN_ABS = 0xfff1, // Symbol has absolute value; does not need relocation
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SHN_COMMON = 0xfff2, // FORTRAN COMMON or C external global variables
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SHN_HIRESERVE = 0xffff // Highest reserved index
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};
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// Section types.
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enum {
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SHT_NULL = 0, // No associated section (inactive entry).
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SHT_PROGBITS = 1, // Program-defined contents.
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SHT_SYMTAB = 2, // Symbol table.
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SHT_STRTAB = 3, // String table.
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SHT_RELA = 4, // Relocation entries; explicit addends.
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SHT_HASH = 5, // Symbol hash table.
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SHT_DYNAMIC = 6, // Information for dynamic linking.
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SHT_NOTE = 7, // Information about the file.
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SHT_NOBITS = 8, // Data occupies no space in the file.
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SHT_REL = 9, // Relocation entries; no explicit addends.
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SHT_SHLIB = 10, // Reserved.
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SHT_DYNSYM = 11, // Symbol table.
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SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type.
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SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type.
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SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
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SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
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};
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// Section flags.
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enum {
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SHF_WRITE = 0x1, // Section data should be writable during execution.
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SHF_ALLOC = 0x2, // Section occupies memory during program execution.
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SHF_EXECINSTR = 0x4, // Section contains executable machine instructions.
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SHF_MASKPROC = 0xf0000000 // Bits indicating processor-specific flags.
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};
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// Symbol table entries.
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struct Elf32_Sym {
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Elf32_Word st_name; // Symbol name (index into string table)
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Elf32_Addr st_value; // Value or address associated with the symbol
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Elf32_Word st_size; // Size of the symbol
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unsigned char st_info; // Symbol's type and binding attributes
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unsigned char st_other; // Must be zero; reserved
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Elf32_Half st_shndx; // Which section (header table index) it's defined in
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// These accessors and mutators correspond to the ELF32_ST_BIND,
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// ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification:
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unsigned char getBinding () const { return st_info >> 4; }
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unsigned char getType () const { return st_info & 0x0f; }
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void setBinding (unsigned char b) { setBindingAndType (b, getType ()); }
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void setType (unsigned char t) { setBindingAndType (getBinding (), t); }
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void setBindingAndType (unsigned char b, unsigned char t) {
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st_info = (b << 4) + (t & 0x0f);
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}
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};
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// Symbol bindings.
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enum {
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STB_LOCAL = 0, // Local symbol, not visible outside obj file containing def
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STB_GLOBAL = 1, // Global symbol, visible to all object files being combined
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STB_WEAK = 2, // Weak symbol, like global but lower-precedence
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STB_LOPROC = 13, // Lowest processor-specific binding type
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STB_HIPROC = 15 // Highest processor-specific binding type
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};
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// Symbol types.
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enum {
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STT_NOTYPE = 0, // Symbol's type is not specified
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STT_OBJECT = 1, // Symbol is a data object (variable, array, etc.)
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STT_FUNC = 2, // Symbol is executable code (function, etc.)
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STT_SECTION = 3, // Symbol refers to a section
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STT_FILE = 4, // Local, absolute symbol that refers to a file
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STT_LOPROC = 13, // Lowest processor-specific symbol type
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STT_HIPROC = 15 // Highest processor-specific symbol type
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};
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// Relocation entry, without explicit addend.
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struct Elf32_Rel {
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Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
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Elf32_Word r_info; // Symbol table index and type of relocation to apply
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// These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
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// and ELF32_R_INFO macros defined in the ELF specification:
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Elf32_Word getSymbol () const { return (r_info >> 8); }
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unsigned char getType () const { return (unsigned char) (r_info & 0x0ff); }
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void setSymbol (Elf32_Word s) { setSymbolAndType (s, getType ()); }
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void setType (unsigned char t) { setSymbolAndType (getSymbol(), t); }
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void setSymbolAndType (Elf32_Word s, unsigned char t) {
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r_info = (s << 8) + t;
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};
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};
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// Relocation entry with explicit addend.
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struct Elf32_Rela {
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Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
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Elf32_Word r_info; // Symbol table index and type of relocation to apply
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Elf32_Sword r_addend; // Compute value for relocatable field by adding this
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// These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
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// and ELF32_R_INFO macros defined in the ELF specification:
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Elf32_Word getSymbol () const { return (r_info >> 8); }
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unsigned char getType () const { return (unsigned char) (r_info & 0x0ff); }
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void setSymbol (Elf32_Word s) { setSymbolAndType (s, getType ()); }
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void setType (unsigned char t) { setSymbolAndType (getSymbol(), t); }
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void setSymbolAndType (Elf32_Word s, unsigned char t) {
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r_info = (s << 8) + t;
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};
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};
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// Program header.
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struct Elf32_Phdr {
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Elf32_Word p_type; // Type of segment
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Elf32_Off p_offset; // File offset where segment is located, in bytes
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Elf32_Addr p_vaddr; // Virtual address of beginning of segment
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Elf32_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
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Elf32_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
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Elf32_Word p_memsz; // Num. of bytes in mem image of segment (may be zero)
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Elf32_Word p_flags; // Segment flags
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Elf32_Word p_align; // Segment alignment constraint
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};
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enum {
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PT_NULL = 0, // Unused segment.
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PT_LOAD = 1, // Loadable segment.
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PT_DYNAMIC = 2, // Dynamic linking information.
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PT_INTERP = 3, // Interpreter pathname.
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PT_NOTE = 4, // Auxiliary information.
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PT_SHLIB = 5, // Reserved.
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PT_PHDR = 6, // The program header table itself.
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PT_LOPROC = 0x70000000, // Lowest processor-specific program hdr entry type.
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PT_HIPROC = 0x7fffffff // Highest processor-specific program hdr entry type.
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};
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} // end namespace ELF
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} // end namespace llvm
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