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* ELFTypes.h contains template magic for defining types based on endianess, size, and alignment. * ELFFile.h defines the ELFFile class which provides low level ELF specific access. * ELFObjectFile.h contains ELFObjectFile which uses ELFFile to implement the ObjectFile interface. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188022 91177308-0d34-0410-b5e6-96231b3b80d8
464 lines
20 KiB
C++
464 lines
20 KiB
C++
//===- ELFTypes.h - Endian specific types for ELF ---------------*- 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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#ifndef LLVM_OBJECT_ELF_TYPES_H
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#define LLVM_OBJECT_ELF_TYPES_H
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#include "llvm/Support/AlignOf.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/Endian.h"
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namespace llvm {
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namespace object {
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using support::endianness;
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template <endianness target_endianness, std::size_t max_alignment,
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bool is64Bits>
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struct ELFType {
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static const endianness TargetEndianness = target_endianness;
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static const std::size_t MaxAlignment = max_alignment;
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static const bool Is64Bits = is64Bits;
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};
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template <typename T, int max_align> struct MaximumAlignment {
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enum { value = AlignOf<T>::Alignment > max_align ? max_align
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: AlignOf<T>::Alignment
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};
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};
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// Templates to choose Elf_Addr and Elf_Off depending on is64Bits.
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template <endianness target_endianness, std::size_t max_alignment>
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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,
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MaximumAlignment<uint16_t, max_alignment>::value> Elf_Half;
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typedef support::detail::packed_endian_specific_integral<
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uint32_t, target_endianness,
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MaximumAlignment<uint32_t, max_alignment>::value> Elf_Word;
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typedef support::detail::packed_endian_specific_integral<
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int32_t, target_endianness,
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MaximumAlignment<int32_t, max_alignment>::value> Elf_Sword;
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typedef support::detail::packed_endian_specific_integral<
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uint64_t, target_endianness,
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MaximumAlignment<uint64_t, max_alignment>::value> Elf_Xword;
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typedef support::detail::packed_endian_specific_integral<
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int64_t, target_endianness,
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MaximumAlignment<int64_t, max_alignment>::value> Elf_Sxword;
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};
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template <class ELFT> struct ELFDataTypeTypedefHelper;
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/// ELF 32bit types.
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct ELFDataTypeTypedefHelper<ELFType<TargetEndianness, MaxAlign, false> >
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: ELFDataTypeTypedefHelperCommon<TargetEndianness, MaxAlign> {
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typedef uint32_t value_type;
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typedef support::detail::packed_endian_specific_integral<
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value_type, TargetEndianness,
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MaximumAlignment<value_type, MaxAlign>::value> Elf_Addr;
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typedef support::detail::packed_endian_specific_integral<
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value_type, TargetEndianness,
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MaximumAlignment<value_type, MaxAlign>::value> Elf_Off;
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};
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/// ELF 64bit types.
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct ELFDataTypeTypedefHelper<ELFType<TargetEndianness, MaxAlign, true> >
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: ELFDataTypeTypedefHelperCommon<TargetEndianness, MaxAlign> {
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typedef uint64_t value_type;
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typedef support::detail::packed_endian_specific_integral<
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value_type, TargetEndianness,
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MaximumAlignment<value_type, MaxAlign>::value> Elf_Addr;
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typedef support::detail::packed_endian_specific_integral<
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value_type, TargetEndianness,
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MaximumAlignment<value_type, MaxAlign>::value> Elf_Off;
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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(E, M, W) \
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typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Addr \
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Elf_Addr; \
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typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Off \
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Elf_Off; \
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typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Half \
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Elf_Half; \
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typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Word \
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Elf_Word; \
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typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Sword \
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Elf_Sword; \
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typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Xword \
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Elf_Xword; \
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typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Sxword \
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Elf_Sxword;
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#define LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) \
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LLVM_ELF_IMPORT_TYPES(ELFT::TargetEndianness, ELFT::MaxAlignment, \
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ELFT::Is64Bits)
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// Section header.
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template <class ELFT> struct Elf_Shdr_Base;
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Shdr_Base<ELFType<TargetEndianness, MaxAlign, false> > {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, 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 <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Shdr_Base<ELFType<TargetEndianness, MaxAlign, true> > {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, 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 <class ELFT>
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struct Elf_Shdr_Impl : Elf_Shdr_Base<ELFT> {
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using Elf_Shdr_Base<ELFT>::sh_entsize;
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using Elf_Shdr_Base<ELFT>::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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template <class ELFT> struct Elf_Sym_Base;
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Sym_Base<ELFType<TargetEndianness, MaxAlign, false> > {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, 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 <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Sym_Base<ELFType<TargetEndianness, MaxAlign, true> > {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, 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 <class ELFT>
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struct Elf_Sym_Impl : Elf_Sym_Base<ELFT> {
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using Elf_Sym_Base<ELFT>::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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/// Elf_Versym: This is the structure of entries in the SHT_GNU_versym section
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/// (.gnu.version). This structure is identical for ELF32 and ELF64.
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template <class ELFT>
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struct Elf_Versym_Impl {
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LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
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Elf_Half vs_index; // Version index with flags (e.g. VERSYM_HIDDEN)
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};
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template <class ELFT> struct Elf_Verdaux_Impl;
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/// Elf_Verdef: This is the structure of entries in the SHT_GNU_verdef section
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/// (.gnu.version_d). This structure is identical for ELF32 and ELF64.
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template <class ELFT>
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struct Elf_Verdef_Impl {
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LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
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typedef Elf_Verdaux_Impl<ELFT> Elf_Verdaux;
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Elf_Half vd_version; // Version of this structure (e.g. VER_DEF_CURRENT)
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Elf_Half vd_flags; // Bitwise flags (VER_DEF_*)
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Elf_Half vd_ndx; // Version index, used in .gnu.version entries
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Elf_Half vd_cnt; // Number of Verdaux entries
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Elf_Word vd_hash; // Hash of name
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Elf_Word vd_aux; // Offset to the first Verdaux entry (in bytes)
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Elf_Word vd_next; // Offset to the next Verdef entry (in bytes)
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/// Get the first Verdaux entry for this Verdef.
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const Elf_Verdaux *getAux() const {
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return reinterpret_cast<const Elf_Verdaux *>((const char *)this + vd_aux);
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}
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};
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/// Elf_Verdaux: This is the structure of auxiliary data in the SHT_GNU_verdef
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/// section (.gnu.version_d). This structure is identical for ELF32 and ELF64.
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template <class ELFT>
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struct Elf_Verdaux_Impl {
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LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
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Elf_Word vda_name; // Version name (offset in string table)
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Elf_Word vda_next; // Offset to next Verdaux entry (in bytes)
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};
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/// Elf_Verneed: This is the structure of entries in the SHT_GNU_verneed
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/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64.
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template <class ELFT>
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struct Elf_Verneed_Impl {
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LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
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Elf_Half vn_version; // Version of this structure (e.g. VER_NEED_CURRENT)
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Elf_Half vn_cnt; // Number of associated Vernaux entries
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Elf_Word vn_file; // Library name (string table offset)
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Elf_Word vn_aux; // Offset to first Vernaux entry (in bytes)
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Elf_Word vn_next; // Offset to next Verneed entry (in bytes)
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};
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/// Elf_Vernaux: This is the structure of auxiliary data in SHT_GNU_verneed
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/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64.
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template <class ELFT>
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struct Elf_Vernaux_Impl {
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LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
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Elf_Word vna_hash; // Hash of dependency name
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Elf_Half vna_flags; // Bitwise Flags (VER_FLAG_*)
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Elf_Half vna_other; // Version index, used in .gnu.version entries
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Elf_Word vna_name; // Dependency name
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Elf_Word vna_next; // Offset to next Vernaux entry (in bytes)
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};
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/// Elf_Dyn_Base: This structure matches the form of entries in the dynamic
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/// table section (.dynamic) look like.
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template <class ELFT> struct Elf_Dyn_Base;
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Dyn_Base<ELFType<TargetEndianness, MaxAlign, false> > {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false)
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Elf_Sword d_tag;
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union {
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Elf_Word d_val;
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Elf_Addr d_ptr;
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} d_un;
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};
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Dyn_Base<ELFType<TargetEndianness, MaxAlign, true> > {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true)
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Elf_Sxword d_tag;
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union {
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Elf_Xword d_val;
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Elf_Addr d_ptr;
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} d_un;
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};
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/// Elf_Dyn_Impl: This inherits from Elf_Dyn_Base, adding getters and setters.
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template <class ELFT>
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struct Elf_Dyn_Impl : Elf_Dyn_Base<ELFT> {
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using Elf_Dyn_Base<ELFT>::d_tag;
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using Elf_Dyn_Base<ELFT>::d_un;
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int64_t getTag() const { return d_tag; }
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uint64_t getVal() const { return d_un.d_val; }
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uint64_t getPtr() const { return d_un.ptr; }
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};
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// Elf_Rel: Elf Relocation
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template <class ELFT, bool isRela> struct Elf_Rel_Base;
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, false>, false> {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false)
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Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
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Elf_Word r_info; // Symbol table index and type of relocation to apply
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uint32_t getRInfo(bool isMips64EL) const {
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assert(!isMips64EL);
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return r_info;
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}
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void setRInfo(uint32_t R) { r_info = R; }
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};
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, true>, false> {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true)
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Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
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Elf_Xword r_info; // Symbol table index and type of relocation to apply
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uint64_t getRInfo(bool isMips64EL) const {
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uint64_t t = r_info;
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if (!isMips64EL)
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return t;
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// Mips64 little endian has a "special" encoding of r_info. Instead of one
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// 64 bit little endian number, it is a little endian 32 bit number followed
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// by a 32 bit big endian number.
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return (t << 32) | ((t >> 8) & 0xff000000) | ((t >> 24) & 0x00ff0000) |
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((t >> 40) & 0x0000ff00) | ((t >> 56) & 0x000000ff);
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}
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void setRInfo(uint64_t R) {
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// FIXME: Add mips64el support.
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r_info = R;
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}
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};
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, false>, true> {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false)
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Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
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Elf_Word r_info; // Symbol table index and type of relocation to apply
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Elf_Sword r_addend; // Compute value for relocatable field by adding this
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uint32_t getRInfo(bool isMips64EL) const {
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assert(!isMips64EL);
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return r_info;
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}
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void setRInfo(uint32_t R) { r_info = R; }
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};
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template <endianness TargetEndianness, std::size_t MaxAlign>
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struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, true>, true> {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true)
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Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
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Elf_Xword r_info; // Symbol table index and type of relocation to apply
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Elf_Sxword r_addend; // Compute value for relocatable field by adding this.
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uint64_t getRInfo(bool isMips64EL) const {
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// Mips64 little endian has a "special" encoding of r_info. Instead of one
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// 64 bit little endian number, it is a little endian 32 bit number followed
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// by a 32 bit big endian number.
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uint64_t t = r_info;
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if (!isMips64EL)
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return t;
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return (t << 32) | ((t >> 8) & 0xff000000) | ((t >> 24) & 0x00ff0000) |
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((t >> 40) & 0x0000ff00) | ((t >> 56) & 0x000000ff);
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}
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void setRInfo(uint64_t R) {
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// FIXME: Add mips64el support.
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r_info = R;
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}
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};
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template <class ELFT, bool isRela> struct Elf_Rel_Impl;
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template <endianness TargetEndianness, std::size_t MaxAlign, bool isRela>
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struct Elf_Rel_Impl<ELFType<TargetEndianness, MaxAlign, true>,
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isRela> : Elf_Rel_Base<
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ELFType<TargetEndianness, MaxAlign, true>, isRela> {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true)
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// These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
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// and ELF64_R_INFO macros defined in the ELF specification:
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uint32_t getSymbol(bool isMips64EL) const {
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return (uint32_t)(this->getRInfo(isMips64EL) >> 32);
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}
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uint32_t getType(bool isMips64EL) const {
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return (uint32_t)(this->getRInfo(isMips64EL) & 0xffffffffL);
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}
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void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); }
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void setType(uint32_t t) { setSymbolAndType(getSymbol(), t); }
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void setSymbolAndType(uint32_t s, uint32_t t) {
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this->setRInfo(((uint64_t)s << 32) + (t & 0xffffffffL));
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}
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};
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template <endianness TargetEndianness, std::size_t MaxAlign, bool isRela>
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struct Elf_Rel_Impl<ELFType<TargetEndianness, MaxAlign, false>,
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isRela> : Elf_Rel_Base<
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ELFType<TargetEndianness, MaxAlign, false>, isRela> {
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LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false)
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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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|
uint32_t getSymbol(bool isMips64EL) const {
|
|
return this->getRInfo(isMips64EL) >> 8;
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|
}
|
|
unsigned char getType(bool isMips64EL) const {
|
|
return (unsigned char)(this->getRInfo(isMips64EL) & 0x0ff);
|
|
}
|
|
void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); }
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|
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
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|
void setSymbolAndType(uint32_t s, unsigned char t) {
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|
this->setRInfo((s << 8) + t);
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|
}
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|
};
|
|
|
|
template <class ELFT>
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|
struct Elf_Ehdr_Impl {
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|
LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
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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
|
|
Elf_Off e_phoff; // Program header table's file offset, in bytes
|
|
Elf_Off e_shoff; // Section header table's file offset, in bytes
|
|
Elf_Word e_flags; // Processor-specific flags
|
|
Elf_Half e_ehsize; // Size of ELF header, in bytes
|
|
Elf_Half e_phentsize; // Size of an entry in the program header table
|
|
Elf_Half e_phnum; // Number of entries in the program header table
|
|
Elf_Half e_shentsize; // Size of an entry in the section header table
|
|
Elf_Half e_shnum; // Number of entries in the section header table
|
|
Elf_Half e_shstrndx; // Section header table index of section name
|
|
// string table
|
|
bool checkMagic() const {
|
|
return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0;
|
|
}
|
|
unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; }
|
|
unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; }
|
|
};
|
|
|
|
template <class ELFT> struct Elf_Phdr_Impl;
|
|
|
|
template <endianness TargetEndianness, std::size_t MaxAlign>
|
|
struct Elf_Phdr_Impl<ELFType<TargetEndianness, MaxAlign, false> > {
|
|
LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false)
|
|
Elf_Word p_type; // Type of segment
|
|
Elf_Off p_offset; // FileOffset where segment is located, in bytes
|
|
Elf_Addr p_vaddr; // Virtual Address of beginning of segment
|
|
Elf_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
|
|
Elf_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
|
|
Elf_Word p_memsz; // Num. of bytes in mem image of segment (may be zero)
|
|
Elf_Word p_flags; // Segment flags
|
|
Elf_Word p_align; // Segment alignment constraint
|
|
};
|
|
|
|
template <endianness TargetEndianness, std::size_t MaxAlign>
|
|
struct Elf_Phdr_Impl<ELFType<TargetEndianness, MaxAlign, true> > {
|
|
LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true)
|
|
Elf_Word p_type; // Type of segment
|
|
Elf_Word p_flags; // Segment flags
|
|
Elf_Off p_offset; // FileOffset where segment is located, in bytes
|
|
Elf_Addr p_vaddr; // Virtual Address of beginning of segment
|
|
Elf_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
|
|
Elf_Xword p_filesz; // Num. of bytes in file image of segment (may be zero)
|
|
Elf_Xword p_memsz; // Num. of bytes in mem image of segment (may be zero)
|
|
Elf_Xword p_align; // Segment alignment constraint
|
|
};
|
|
|
|
} // end namespace object.
|
|
} // end namespace llvm.
|
|
|
|
#endif
|