forked from OSchip/llvm-project
741 lines
28 KiB
C++
741 lines
28 KiB
C++
//===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the ELFObjectFile class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <limits>
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#include <utility>
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using namespace llvm;
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using namespace object;
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// Templates to choose Elf_Addr and Elf_Off depending on is64Bits.
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namespace {
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template<support::endianness target_endianness>
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struct ELFDataTypeTypedefHelperCommon {
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typedef support::detail::packed_endian_specific_integral
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<uint16_t, target_endianness, support::aligned> Elf_Half;
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typedef support::detail::packed_endian_specific_integral
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<uint32_t, target_endianness, support::aligned> Elf_Word;
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typedef support::detail::packed_endian_specific_integral
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<int32_t, target_endianness, support::aligned> Elf_Sword;
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typedef support::detail::packed_endian_specific_integral
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<uint64_t, target_endianness, support::aligned> Elf_Xword;
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typedef support::detail::packed_endian_specific_integral
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<int64_t, target_endianness, support::aligned> Elf_Sxword;
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};
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}
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namespace {
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template<support::endianness target_endianness, bool is64Bits>
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struct ELFDataTypeTypedefHelper;
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/// ELF 32bit types.
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template<support::endianness target_endianness>
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struct ELFDataTypeTypedefHelper<target_endianness, false>
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: ELFDataTypeTypedefHelperCommon<target_endianness> {
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typedef support::detail::packed_endian_specific_integral
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<uint32_t, target_endianness, support::aligned> Elf_Addr;
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typedef support::detail::packed_endian_specific_integral
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<uint32_t, target_endianness, support::aligned> Elf_Off;
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};
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/// ELF 64bit types.
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template<support::endianness target_endianness>
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struct ELFDataTypeTypedefHelper<target_endianness, true>
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: ELFDataTypeTypedefHelperCommon<target_endianness>{
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typedef support::detail::packed_endian_specific_integral
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<uint64_t, target_endianness, support::aligned> Elf_Addr;
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typedef support::detail::packed_endian_specific_integral
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<uint64_t, target_endianness, support::aligned> Elf_Off;
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};
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}
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// I really don't like doing this, but the alternative is copypasta.
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#define LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) \
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typedef typename \
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ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Addr Elf_Addr; \
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typedef typename \
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ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Off Elf_Off; \
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typedef typename \
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ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Half Elf_Half; \
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typedef typename \
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ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Word Elf_Word; \
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typedef typename \
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ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sword Elf_Sword; \
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typedef typename \
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ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Xword Elf_Xword; \
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typedef typename \
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ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sxword Elf_Sxword;
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// Section header.
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namespace {
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Shdr_Base;
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template<support::endianness target_endianness>
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struct Elf_Shdr_Base<target_endianness, false> {
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LLVM_ELF_IMPORT_TYPES(target_endianness, false)
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Elf_Word sh_name; // Section name (index into string table)
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Elf_Word sh_type; // Section type (SHT_*)
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Elf_Word sh_flags; // Section flags (SHF_*)
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Elf_Addr sh_addr; // Address where section is to be loaded
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Elf_Off sh_offset; // File offset of section data, in bytes
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Elf_Word sh_size; // Size of section, in bytes
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Elf_Word sh_link; // Section type-specific header table index link
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Elf_Word sh_info; // Section type-specific extra information
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Elf_Word sh_addralign;// Section address alignment
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Elf_Word sh_entsize; // Size of records contained within the section
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};
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template<support::endianness target_endianness>
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struct Elf_Shdr_Base<target_endianness, true> {
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LLVM_ELF_IMPORT_TYPES(target_endianness, true)
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Elf_Word sh_name; // Section name (index into string table)
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Elf_Word sh_type; // Section type (SHT_*)
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Elf_Xword sh_flags; // Section flags (SHF_*)
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Elf_Addr sh_addr; // Address where section is to be loaded
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Elf_Off sh_offset; // File offset of section data, in bytes
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Elf_Xword sh_size; // Size of section, in bytes
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Elf_Word sh_link; // Section type-specific header table index link
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Elf_Word sh_info; // Section type-specific extra information
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Elf_Xword sh_addralign;// Section address alignment
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Elf_Xword sh_entsize; // Size of records contained within the section
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};
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Shdr_Impl : Elf_Shdr_Base<target_endianness, is64Bits> {
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using Elf_Shdr_Base<target_endianness, is64Bits>::sh_entsize;
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using Elf_Shdr_Base<target_endianness, is64Bits>::sh_size;
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/// @brief Get the number of entities this section contains if it has any.
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unsigned getEntityCount() const {
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if (sh_entsize == 0)
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return 0;
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return sh_size / sh_entsize;
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}
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};
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}
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namespace {
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Sym_Base;
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template<support::endianness target_endianness>
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struct Elf_Sym_Base<target_endianness, false> {
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LLVM_ELF_IMPORT_TYPES(target_endianness, false)
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Elf_Word st_name; // Symbol name (index into string table)
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Elf_Addr st_value; // Value or address associated with the symbol
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Elf_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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Elf_Half st_shndx; // Which section (header table index) it's defined in
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};
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template<support::endianness target_endianness>
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struct Elf_Sym_Base<target_endianness, true> {
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LLVM_ELF_IMPORT_TYPES(target_endianness, true)
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Elf_Word st_name; // Symbol name (index into string table)
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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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Elf_Half st_shndx; // Which section (header table index) it's defined in
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Elf_Addr st_value; // Value or address associated with the symbol
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Elf_Xword st_size; // Size of the symbol
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};
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Sym_Impl : Elf_Sym_Base<target_endianness, is64Bits> {
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using Elf_Sym_Base<target_endianness, is64Bits>::st_info;
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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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}
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namespace {
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template<support::endianness target_endianness, bool is64Bits>
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class ELFObjectFile : public ObjectFile {
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LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
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typedef Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr;
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typedef Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym;
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struct Elf_Ehdr {
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unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes
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Elf_Half e_type; // Type of file (see ET_*)
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Elf_Half e_machine; // Required architecture for this file (see EM_*)
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Elf_Word e_version; // Must be equal to 1
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Elf_Addr e_entry; // Address to jump to in order to start program
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Elf_Off e_phoff; // Program header table's file offset, in bytes
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Elf_Off e_shoff; // Section header table's file offset, in bytes
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Elf_Word e_flags; // Processor-specific flags
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Elf_Half e_ehsize; // Size of ELF header, in bytes
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Elf_Half e_phentsize;// Size of an entry in the program header table
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Elf_Half e_phnum; // Number of entries in the program header table
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Elf_Half e_shentsize;// Size of an entry in the section header table
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Elf_Half e_shnum; // Number of entries in the section header table
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Elf_Half e_shstrndx; // Section header table index of section name
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// string table
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bool checkMagic() const {
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return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0;
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}
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unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; }
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unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; }
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};
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typedef SmallVector<const Elf_Shdr*, 1> SymbolTableSections_t;
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const Elf_Ehdr *Header;
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const Elf_Shdr *SectionHeaderTable;
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const Elf_Shdr *dot_shstrtab_sec; // Section header string table.
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const Elf_Shdr *dot_strtab_sec; // Symbol header string table.
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SymbolTableSections_t SymbolTableSections;
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void validateSymbol(DataRefImpl Symb) const;
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const Elf_Sym *getSymbol(DataRefImpl Symb) const;
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const Elf_Shdr *getSection(DataRefImpl index) const;
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const Elf_Shdr *getSection(uint16_t index) const;
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const char *getString(uint16_t section, uint32_t offset) const;
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const char *getString(const Elf_Shdr *section, uint32_t offset) const;
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protected:
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virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const;
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virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const;
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virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const;
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virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const;
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virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const;
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virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const;
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virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const;
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virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const;
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virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const;
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virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
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virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
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virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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bool &Result) const;
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public:
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ELFObjectFile(MemoryBuffer *Object, error_code &ec);
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virtual symbol_iterator begin_symbols() const;
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virtual symbol_iterator end_symbols() const;
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virtual section_iterator begin_sections() const;
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virtual section_iterator end_sections() const;
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virtual uint8_t getBytesInAddress() const;
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virtual StringRef getFileFormatName() const;
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virtual unsigned getArch() const;
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};
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} // end namespace
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template<support::endianness target_endianness, bool is64Bits>
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void ELFObjectFile<target_endianness, is64Bits>
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::validateSymbol(DataRefImpl Symb) const {
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const Elf_Sym *symb = getSymbol(Symb);
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const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
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// FIXME: We really need to do proper error handling in the case of an invalid
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// input file. Because we don't use exceptions, I think we'll just pass
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// an error object around.
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if (!( symb
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&& SymbolTableSection
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&& symb >= (const Elf_Sym*)(base()
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+ SymbolTableSection->sh_offset)
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&& symb < (const Elf_Sym*)(base()
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+ SymbolTableSection->sh_offset
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+ SymbolTableSection->sh_size)))
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// FIXME: Proper error handling.
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report_fatal_error("Symb must point to a valid symbol!");
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::getSymbolNext(DataRefImpl Symb,
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SymbolRef &Result) const {
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validateSymbol(Symb);
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const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
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++Symb.d.a;
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// Check to see if we are at the end of this symbol table.
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if (Symb.d.a >= SymbolTableSection->getEntityCount()) {
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// We are at the end. If there are other symbol tables, jump to them.
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++Symb.d.b;
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Symb.d.a = 1; // The 0th symbol in ELF is fake.
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// Otherwise return the terminator.
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if (Symb.d.b >= SymbolTableSections.size()) {
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Symb.d.a = std::numeric_limits<uint32_t>::max();
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Symb.d.b = std::numeric_limits<uint32_t>::max();
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}
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}
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Result = SymbolRef(Symb, this);
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return object_error::success;
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::getSymbolName(DataRefImpl Symb,
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StringRef &Result) const {
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validateSymbol(Symb);
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const Elf_Sym *symb = getSymbol(Symb);
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if (symb->st_name == 0) {
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const Elf_Shdr *section = getSection(symb->st_shndx);
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if (!section)
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Result = "";
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else
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Result = getString(dot_shstrtab_sec, section->sh_name);
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return object_error::success;
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}
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// Use the default symbol table name section.
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Result = getString(dot_strtab_sec, symb->st_name);
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return object_error::success;
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::getSymbolAddress(DataRefImpl Symb,
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uint64_t &Result) const {
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validateSymbol(Symb);
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const Elf_Sym *symb = getSymbol(Symb);
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const Elf_Shdr *Section;
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switch (symb->st_shndx) {
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case ELF::SHN_COMMON:
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// Undefined symbols have no address yet.
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case ELF::SHN_UNDEF:
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Result = UnknownAddressOrSize;
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return object_error::success;
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case ELF::SHN_ABS:
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Result = symb->st_value;
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return object_error::success;
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default: Section = getSection(symb->st_shndx);
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}
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switch (symb->getType()) {
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case ELF::STT_SECTION:
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Result = Section ? Section->sh_addr : UnknownAddressOrSize;
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return object_error::success;
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case ELF::STT_FUNC:
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case ELF::STT_OBJECT:
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case ELF::STT_NOTYPE:
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Result = symb->st_value;
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return object_error::success;
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default:
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Result = UnknownAddressOrSize;
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return object_error::success;
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}
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::getSymbolSize(DataRefImpl Symb,
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uint64_t &Result) const {
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validateSymbol(Symb);
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const Elf_Sym *symb = getSymbol(Symb);
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if (symb->st_size == 0)
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Result = UnknownAddressOrSize;
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Result = symb->st_size;
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return object_error::success;
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::getSymbolNMTypeChar(DataRefImpl Symb,
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char &Result) const {
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validateSymbol(Symb);
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const Elf_Sym *symb = getSymbol(Symb);
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const Elf_Shdr *Section = getSection(symb->st_shndx);
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char ret = '?';
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if (Section) {
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switch (Section->sh_type) {
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case ELF::SHT_PROGBITS:
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case ELF::SHT_DYNAMIC:
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switch (Section->sh_flags) {
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case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR):
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ret = 't'; break;
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case (ELF::SHF_ALLOC | ELF::SHF_WRITE):
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ret = 'd'; break;
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case ELF::SHF_ALLOC:
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case (ELF::SHF_ALLOC | ELF::SHF_MERGE):
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case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS):
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ret = 'r'; break;
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}
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break;
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case ELF::SHT_NOBITS: ret = 'b';
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}
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}
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switch (symb->st_shndx) {
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case ELF::SHN_UNDEF:
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if (ret == '?')
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ret = 'U';
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break;
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case ELF::SHN_ABS: ret = 'a'; break;
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case ELF::SHN_COMMON: ret = 'c'; break;
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}
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switch (symb->getBinding()) {
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case ELF::STB_GLOBAL: ret = ::toupper(ret); break;
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case ELF::STB_WEAK:
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if (symb->st_shndx == ELF::SHN_UNDEF)
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ret = 'w';
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else
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if (symb->getType() == ELF::STT_OBJECT)
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ret = 'V';
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else
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ret = 'W';
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}
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if (ret == '?' && symb->getType() == ELF::STT_SECTION) {
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StringRef name;
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if (error_code ec = getSymbolName(Symb, name))
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return ec;
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Result = StringSwitch<char>(name)
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.StartsWith(".debug", 'N')
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.StartsWith(".note", 'n');
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return object_error::success;
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}
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Result = ret;
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return object_error::success;
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::isSymbolInternal(DataRefImpl Symb,
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bool &Result) const {
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validateSymbol(Symb);
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const Elf_Sym *symb = getSymbol(Symb);
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|
|
if ( symb->getType() == ELF::STT_FILE
|
|
|| symb->getType() == ELF::STT_SECTION)
|
|
Result = true;
|
|
Result = false;
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
error_code ELFObjectFile<target_endianness, is64Bits>
|
|
::getSectionNext(DataRefImpl Sec, SectionRef &Result) const {
|
|
const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p);
|
|
sec += Header->e_shentsize;
|
|
Sec.p = reinterpret_cast<intptr_t>(sec);
|
|
Result = SectionRef(Sec, this);
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
error_code ELFObjectFile<target_endianness, is64Bits>
|
|
::getSectionName(DataRefImpl Sec,
|
|
StringRef &Result) const {
|
|
const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
|
|
Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name));
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
error_code ELFObjectFile<target_endianness, is64Bits>
|
|
::getSectionAddress(DataRefImpl Sec,
|
|
uint64_t &Result) const {
|
|
const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
|
|
Result = sec->sh_addr;
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
error_code ELFObjectFile<target_endianness, is64Bits>
|
|
::getSectionSize(DataRefImpl Sec,
|
|
uint64_t &Result) const {
|
|
const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
|
|
Result = sec->sh_size;
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
error_code ELFObjectFile<target_endianness, is64Bits>
|
|
::getSectionContents(DataRefImpl Sec,
|
|
StringRef &Result) const {
|
|
const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
|
|
const char *start = (const char*)base() + sec->sh_offset;
|
|
Result = StringRef(start, sec->sh_size);
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
error_code ELFObjectFile<target_endianness, is64Bits>
|
|
::isSectionText(DataRefImpl Sec,
|
|
bool &Result) const {
|
|
const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
|
|
if (sec->sh_flags & ELF::SHF_EXECINSTR)
|
|
Result = true;
|
|
else
|
|
Result = false;
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
error_code ELFObjectFile<target_endianness, is64Bits>
|
|
::sectionContainsSymbol(DataRefImpl Sec,
|
|
DataRefImpl Symb,
|
|
bool &Result) const {
|
|
// FIXME: Unimplemented.
|
|
Result = false;
|
|
return object_error::success;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
|
|
, error_code &ec)
|
|
: ObjectFile(Binary::isELF, Object, ec)
|
|
, SectionHeaderTable(0)
|
|
, dot_shstrtab_sec(0)
|
|
, dot_strtab_sec(0) {
|
|
Header = reinterpret_cast<const Elf_Ehdr *>(base());
|
|
|
|
if (Header->e_shoff == 0)
|
|
return;
|
|
|
|
SectionHeaderTable =
|
|
reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
|
|
uint32_t SectionTableSize = Header->e_shnum * Header->e_shentsize;
|
|
if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize
|
|
<= base() + Data->getBufferSize()))
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("Section table goes past end of file!");
|
|
|
|
|
|
// To find the symbol tables we walk the section table to find SHT_STMTAB.
|
|
for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable),
|
|
*e = i + Header->e_shnum * Header->e_shentsize;
|
|
i != e; i += Header->e_shentsize) {
|
|
const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i);
|
|
if (sh->sh_type == ELF::SHT_SYMTAB) {
|
|
SymbolTableSections.push_back(sh);
|
|
}
|
|
}
|
|
|
|
// Get string table sections.
|
|
dot_shstrtab_sec = getSection(Header->e_shstrndx);
|
|
if (dot_shstrtab_sec) {
|
|
// Verify that the last byte in the string table in a null.
|
|
if (((const char*)base() + dot_shstrtab_sec->sh_offset)
|
|
[dot_shstrtab_sec->sh_size - 1] != 0)
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("String table must end with a null terminator!");
|
|
}
|
|
|
|
// Merge this into the above loop.
|
|
for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable),
|
|
*e = i + Header->e_shnum * Header->e_shentsize;
|
|
i != e; i += Header->e_shentsize) {
|
|
const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i);
|
|
if (sh->sh_type == ELF::SHT_STRTAB) {
|
|
StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name));
|
|
if (SectionName == ".strtab") {
|
|
if (dot_strtab_sec != 0)
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("Already found section named .strtab!");
|
|
dot_strtab_sec = sh;
|
|
const char *dot_strtab = (const char*)base() + sh->sh_offset;
|
|
if (dot_strtab[sh->sh_size - 1] != 0)
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("String table must end with a null terminator!");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
ObjectFile::symbol_iterator ELFObjectFile<target_endianness, is64Bits>
|
|
::begin_symbols() const {
|
|
DataRefImpl SymbolData;
|
|
memset(&SymbolData, 0, sizeof(SymbolData));
|
|
if (SymbolTableSections.size() == 0) {
|
|
SymbolData.d.a = std::numeric_limits<uint32_t>::max();
|
|
SymbolData.d.b = std::numeric_limits<uint32_t>::max();
|
|
} else {
|
|
SymbolData.d.a = 1; // The 0th symbol in ELF is fake.
|
|
SymbolData.d.b = 0;
|
|
}
|
|
return symbol_iterator(SymbolRef(SymbolData, this));
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
ObjectFile::symbol_iterator ELFObjectFile<target_endianness, is64Bits>
|
|
::end_symbols() const {
|
|
DataRefImpl SymbolData;
|
|
memset(&SymbolData, 0, sizeof(SymbolData));
|
|
SymbolData.d.a = std::numeric_limits<uint32_t>::max();
|
|
SymbolData.d.b = std::numeric_limits<uint32_t>::max();
|
|
return symbol_iterator(SymbolRef(SymbolData, this));
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
ObjectFile::section_iterator ELFObjectFile<target_endianness, is64Bits>
|
|
::begin_sections() const {
|
|
DataRefImpl ret;
|
|
memset(&ret, 0, sizeof(DataRefImpl));
|
|
ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff);
|
|
return section_iterator(SectionRef(ret, this));
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
ObjectFile::section_iterator ELFObjectFile<target_endianness, is64Bits>
|
|
::end_sections() const {
|
|
DataRefImpl ret;
|
|
memset(&ret, 0, sizeof(DataRefImpl));
|
|
ret.p = reinterpret_cast<intptr_t>(base()
|
|
+ Header->e_shoff
|
|
+ (Header->e_shentsize * Header->e_shnum));
|
|
return section_iterator(SectionRef(ret, this));
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const {
|
|
return is64Bits ? 8 : 4;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
StringRef ELFObjectFile<target_endianness, is64Bits>
|
|
::getFileFormatName() const {
|
|
switch(Header->e_ident[ELF::EI_CLASS]) {
|
|
case ELF::ELFCLASS32:
|
|
switch(Header->e_machine) {
|
|
case ELF::EM_386:
|
|
return "ELF32-i386";
|
|
case ELF::EM_X86_64:
|
|
return "ELF32-x86-64";
|
|
default:
|
|
return "ELF32-unknown";
|
|
}
|
|
case ELF::ELFCLASS64:
|
|
switch(Header->e_machine) {
|
|
case ELF::EM_386:
|
|
return "ELF64-i386";
|
|
case ELF::EM_X86_64:
|
|
return "ELF64-x86-64";
|
|
default:
|
|
return "ELF64-unknown";
|
|
}
|
|
default:
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("Invalid ELFCLASS!");
|
|
}
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const {
|
|
switch(Header->e_machine) {
|
|
case ELF::EM_386:
|
|
return Triple::x86;
|
|
case ELF::EM_X86_64:
|
|
return Triple::x86_64;
|
|
default:
|
|
return Triple::UnknownArch;
|
|
}
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym *
|
|
ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const {
|
|
const Elf_Shdr *sec = SymbolTableSections[Symb.d.b];
|
|
return reinterpret_cast<const Elf_Sym *>(
|
|
base()
|
|
+ sec->sh_offset
|
|
+ (Symb.d.a * sec->sh_entsize));
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
|
|
ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const {
|
|
const Elf_Shdr *sec = getSection(Symb.d.b);
|
|
if (sec->sh_type != ELF::SHT_SYMTAB)
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("Invalid symbol table section!");
|
|
return sec;
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
|
|
ELFObjectFile<target_endianness, is64Bits>::getSection(uint16_t index) const {
|
|
if (index == 0 || index >= ELF::SHN_LORESERVE)
|
|
return 0;
|
|
if (!SectionHeaderTable || index >= Header->e_shnum)
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("Invalid section index!");
|
|
|
|
return reinterpret_cast<const Elf_Shdr *>(
|
|
reinterpret_cast<const char *>(SectionHeaderTable)
|
|
+ (index * Header->e_shentsize));
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
const char *ELFObjectFile<target_endianness, is64Bits>
|
|
::getString(uint16_t section,
|
|
ELF::Elf32_Word offset) const {
|
|
return getString(getSection(section), offset);
|
|
}
|
|
|
|
template<support::endianness target_endianness, bool is64Bits>
|
|
const char *ELFObjectFile<target_endianness, is64Bits>
|
|
::getString(const Elf_Shdr *section,
|
|
ELF::Elf32_Word offset) const {
|
|
assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!");
|
|
if (offset >= section->sh_size)
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("Symbol name offset outside of string table!");
|
|
return (const char *)base() + section->sh_offset + offset;
|
|
}
|
|
|
|
// EI_CLASS, EI_DATA.
|
|
static std::pair<unsigned char, unsigned char>
|
|
getElfArchType(MemoryBuffer *Object) {
|
|
if (Object->getBufferSize() < ELF::EI_NIDENT)
|
|
return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
|
|
return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS]
|
|
, (uint8_t)Object->getBufferStart()[ELF::EI_DATA]);
|
|
}
|
|
|
|
namespace llvm {
|
|
|
|
ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
|
|
std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
|
|
error_code ec;
|
|
if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
|
|
return new ELFObjectFile<support::little, false>(Object, ec);
|
|
else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
|
|
return new ELFObjectFile<support::big, false>(Object, ec);
|
|
else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB)
|
|
return new ELFObjectFile<support::little, true>(Object, ec);
|
|
else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
|
|
return new ELFObjectFile<support::big, true>(Object, ec);
|
|
// FIXME: Proper error handling.
|
|
report_fatal_error("Not an ELF object file!");
|
|
}
|
|
|
|
} // end namespace llvm
|