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Diffstat (limited to 'include/llvm/Object/ELF.h')
| -rw-r--r-- | include/llvm/Object/ELF.h | 2209 |
1 files changed, 2209 insertions, 0 deletions
diff --git a/include/llvm/Object/ELF.h b/include/llvm/Object/ELF.h new file mode 100644 index 0000000..0828985 --- /dev/null +++ b/include/llvm/Object/ELF.h @@ -0,0 +1,2209 @@ +//===- ELF.h - ELF object file implementation -------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file declares the ELFObjectFile template class. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_OBJECT_ELF_H +#define LLVM_OBJECT_ELF_H + +#include "llvm/ADT/SmallVector.h" +#include "llvm/ADT/StringSwitch.h" +#include "llvm/ADT/Triple.h" +#include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/PointerIntPair.h" +#include "llvm/Object/ObjectFile.h" +#include "llvm/Support/Casting.h" +#include "llvm/Support/ELF.h" +#include "llvm/Support/Endian.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/raw_ostream.h" +#include <algorithm> +#include <limits> +#include <utility> + +namespace llvm { +namespace object { + +// Templates to choose Elf_Addr and Elf_Off depending on is64Bits. +template<support::endianness target_endianness> +struct ELFDataTypeTypedefHelperCommon { + typedef support::detail::packed_endian_specific_integral + <uint16_t, target_endianness, support::aligned> Elf_Half; + typedef support::detail::packed_endian_specific_integral + <uint32_t, target_endianness, support::aligned> Elf_Word; + typedef support::detail::packed_endian_specific_integral + <int32_t, target_endianness, support::aligned> Elf_Sword; + typedef support::detail::packed_endian_specific_integral + <uint64_t, target_endianness, support::aligned> Elf_Xword; + typedef support::detail::packed_endian_specific_integral + <int64_t, target_endianness, support::aligned> Elf_Sxword; +}; + +template<support::endianness target_endianness, bool is64Bits> +struct ELFDataTypeTypedefHelper; + +/// ELF 32bit types. +template<support::endianness target_endianness> +struct ELFDataTypeTypedefHelper<target_endianness, false> + : ELFDataTypeTypedefHelperCommon<target_endianness> { + typedef uint32_t value_type; + typedef support::detail::packed_endian_specific_integral + <value_type, target_endianness, support::aligned> Elf_Addr; + typedef support::detail::packed_endian_specific_integral + <value_type, target_endianness, support::aligned> Elf_Off; +}; + +/// ELF 64bit types. +template<support::endianness target_endianness> +struct ELFDataTypeTypedefHelper<target_endianness, true> + : ELFDataTypeTypedefHelperCommon<target_endianness>{ + typedef uint64_t value_type; + typedef support::detail::packed_endian_specific_integral + <value_type, target_endianness, support::aligned> Elf_Addr; + typedef support::detail::packed_endian_specific_integral + <value_type, target_endianness, support::aligned> Elf_Off; +}; + +// I really don't like doing this, but the alternative is copypasta. +#define LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) \ +typedef typename \ + ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Addr Elf_Addr; \ +typedef typename \ + ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Off Elf_Off; \ +typedef typename \ + ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Half Elf_Half; \ +typedef typename \ + ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Word Elf_Word; \ +typedef typename \ + ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sword Elf_Sword; \ +typedef typename \ + ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Xword Elf_Xword; \ +typedef typename \ + ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sxword Elf_Sxword; + + // Section header. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Shdr_Base; + +template<support::endianness target_endianness> +struct Elf_Shdr_Base<target_endianness, false> { + LLVM_ELF_IMPORT_TYPES(target_endianness, false) + Elf_Word sh_name; // Section name (index into string table) + Elf_Word sh_type; // Section type (SHT_*) + Elf_Word sh_flags; // Section flags (SHF_*) + Elf_Addr sh_addr; // Address where section is to be loaded + Elf_Off sh_offset; // File offset of section data, in bytes + Elf_Word sh_size; // Size of section, in bytes + Elf_Word sh_link; // Section type-specific header table index link + Elf_Word sh_info; // Section type-specific extra information + Elf_Word sh_addralign;// Section address alignment + Elf_Word sh_entsize; // Size of records contained within the section +}; + +template<support::endianness target_endianness> +struct Elf_Shdr_Base<target_endianness, true> { + LLVM_ELF_IMPORT_TYPES(target_endianness, true) + Elf_Word sh_name; // Section name (index into string table) + Elf_Word sh_type; // Section type (SHT_*) + Elf_Xword sh_flags; // Section flags (SHF_*) + Elf_Addr sh_addr; // Address where section is to be loaded + Elf_Off sh_offset; // File offset of section data, in bytes + Elf_Xword sh_size; // Size of section, in bytes + Elf_Word sh_link; // Section type-specific header table index link + Elf_Word sh_info; // Section type-specific extra information + Elf_Xword sh_addralign;// Section address alignment + Elf_Xword sh_entsize; // Size of records contained within the section +}; + +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Shdr_Impl : Elf_Shdr_Base<target_endianness, is64Bits> { + using Elf_Shdr_Base<target_endianness, is64Bits>::sh_entsize; + using Elf_Shdr_Base<target_endianness, is64Bits>::sh_size; + + /// @brief Get the number of entities this section contains if it has any. + unsigned getEntityCount() const { + if (sh_entsize == 0) + return 0; + return sh_size / sh_entsize; + } +}; + +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Sym_Base; + +template<support::endianness target_endianness> +struct Elf_Sym_Base<target_endianness, false> { + LLVM_ELF_IMPORT_TYPES(target_endianness, false) + Elf_Word st_name; // Symbol name (index into string table) + Elf_Addr st_value; // Value or address associated with the symbol + Elf_Word st_size; // Size of the symbol + unsigned char st_info; // Symbol's type and binding attributes + unsigned char st_other; // Must be zero; reserved + Elf_Half st_shndx; // Which section (header table index) it's defined in +}; + +template<support::endianness target_endianness> +struct Elf_Sym_Base<target_endianness, true> { + LLVM_ELF_IMPORT_TYPES(target_endianness, true) + Elf_Word st_name; // Symbol name (index into string table) + unsigned char st_info; // Symbol's type and binding attributes + unsigned char st_other; // Must be zero; reserved + Elf_Half st_shndx; // Which section (header table index) it's defined in + Elf_Addr st_value; // Value or address associated with the symbol + Elf_Xword st_size; // Size of the symbol +}; + +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Sym_Impl : Elf_Sym_Base<target_endianness, is64Bits> { + using Elf_Sym_Base<target_endianness, is64Bits>::st_info; + + // These accessors and mutators correspond to the ELF32_ST_BIND, + // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification: + unsigned char getBinding() const { return st_info >> 4; } + unsigned char getType() const { return st_info & 0x0f; } + void setBinding(unsigned char b) { setBindingAndType(b, getType()); } + void setType(unsigned char t) { setBindingAndType(getBinding(), t); } + void setBindingAndType(unsigned char b, unsigned char t) { + st_info = (b << 4) + (t & 0x0f); + } +}; + +/// Elf_Versym: This is the structure of entries in the SHT_GNU_versym section +/// (.gnu.version). This structure is identical for ELF32 and ELF64. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Versym_Impl { + LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) + Elf_Half vs_index; // Version index with flags (e.g. VERSYM_HIDDEN) +}; + +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Verdaux_Impl; + +/// Elf_Verdef: This is the structure of entries in the SHT_GNU_verdef section +/// (.gnu.version_d). This structure is identical for ELF32 and ELF64. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Verdef_Impl { + LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) + typedef Elf_Verdaux_Impl<target_endianness, is64Bits> Elf_Verdaux; + Elf_Half vd_version; // Version of this structure (e.g. VER_DEF_CURRENT) + Elf_Half vd_flags; // Bitwise flags (VER_DEF_*) + Elf_Half vd_ndx; // Version index, used in .gnu.version entries + Elf_Half vd_cnt; // Number of Verdaux entries + Elf_Word vd_hash; // Hash of name + Elf_Word vd_aux; // Offset to the first Verdaux entry (in bytes) + Elf_Word vd_next; // Offset to the next Verdef entry (in bytes) + + /// Get the first Verdaux entry for this Verdef. + const Elf_Verdaux *getAux() const { + return reinterpret_cast<const Elf_Verdaux*>((const char*)this + vd_aux); + } +}; + +/// Elf_Verdaux: This is the structure of auxilary data in the SHT_GNU_verdef +/// section (.gnu.version_d). This structure is identical for ELF32 and ELF64. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Verdaux_Impl { + LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) + Elf_Word vda_name; // Version name (offset in string table) + Elf_Word vda_next; // Offset to next Verdaux entry (in bytes) +}; + +/// Elf_Verneed: This is the structure of entries in the SHT_GNU_verneed +/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Verneed_Impl { + LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) + Elf_Half vn_version; // Version of this structure (e.g. VER_NEED_CURRENT) + Elf_Half vn_cnt; // Number of associated Vernaux entries + Elf_Word vn_file; // Library name (string table offset) + Elf_Word vn_aux; // Offset to first Vernaux entry (in bytes) + Elf_Word vn_next; // Offset to next Verneed entry (in bytes) +}; + +/// Elf_Vernaux: This is the structure of auxiliary data in SHT_GNU_verneed +/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Vernaux_Impl { + LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) + Elf_Word vna_hash; // Hash of dependency name + Elf_Half vna_flags; // Bitwise Flags (VER_FLAG_*) + Elf_Half vna_other; // Version index, used in .gnu.version entries + Elf_Word vna_name; // Dependency name + Elf_Word vna_next; // Offset to next Vernaux entry (in bytes) +}; + +/// Elf_Dyn_Base: This structure matches the form of entries in the dynamic +/// table section (.dynamic) look like. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Dyn_Base; + +template<support::endianness target_endianness> +struct Elf_Dyn_Base<target_endianness, false> { + LLVM_ELF_IMPORT_TYPES(target_endianness, false) + Elf_Sword d_tag; + union { + Elf_Word d_val; + Elf_Addr d_ptr; + } d_un; +}; + +template<support::endianness target_endianness> +struct Elf_Dyn_Base<target_endianness, true> { + LLVM_ELF_IMPORT_TYPES(target_endianness, true) + Elf_Sxword d_tag; + union { + Elf_Xword d_val; + Elf_Addr d_ptr; + } d_un; +}; + +/// Elf_Dyn_Impl: This inherits from Elf_Dyn_Base, adding getters and setters. +template<support::endianness target_endianness, bool is64Bits> +struct Elf_Dyn_Impl : Elf_Dyn_Base<target_endianness, is64Bits> { + using Elf_Dyn_Base<target_endianness, is64Bits>::d_tag; + using Elf_Dyn_Base<target_endianness, is64Bits>::d_un; + int64_t getTag() const { return d_tag; } + uint64_t getVal() const { return d_un.d_val; } + uint64_t getPtr() const { return d_un.ptr; } +}; + +template<support::endianness target_endianness, bool is64Bits> +class ELFObjectFile; + +// DynRefImpl: Reference to an entry in the dynamic table +// This is an ELF-specific interface. +template<support::endianness target_endianness, bool is64Bits> +class DynRefImpl { + typedef Elf_Dyn_Impl<target_endianness, is64Bits> Elf_Dyn; + typedef ELFObjectFile<target_endianness, is64Bits> OwningType; + + DataRefImpl DynPimpl; + const OwningType *OwningObject; + +public: + DynRefImpl() : OwningObject(NULL) { } + + DynRefImpl(DataRefImpl DynP, const OwningType *Owner); + + bool operator==(const DynRefImpl &Other) const; + bool operator <(const DynRefImpl &Other) const; + + error_code getNext(DynRefImpl &Result) const; + int64_t getTag() const; + uint64_t getVal() const; + uint64_t getPtr() const; + + DataRefImpl getRawDataRefImpl() const; +}; + +// Elf_Rel: Elf Relocation +template<support::endianness target_endianness, bool is64Bits, bool isRela> +struct Elf_Rel_Base; + +template<support::endianness target_endianness> +struct Elf_Rel_Base<target_endianness, false, false> { + LLVM_ELF_IMPORT_TYPES(target_endianness, false) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Word r_info; // Symbol table index and type of relocation to apply +}; + +template<support::endianness target_endianness> +struct Elf_Rel_Base<target_endianness, true, false> { + LLVM_ELF_IMPORT_TYPES(target_endianness, true) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Xword r_info; // Symbol table index and type of relocation to apply +}; + +template<support::endianness target_endianness> +struct Elf_Rel_Base<target_endianness, false, true> { + LLVM_ELF_IMPORT_TYPES(target_endianness, false) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Word r_info; // Symbol table index and type of relocation to apply + Elf_Sword r_addend; // Compute value for relocatable field by adding this +}; + +template<support::endianness target_endianness> +struct Elf_Rel_Base<target_endianness, true, true> { + LLVM_ELF_IMPORT_TYPES(target_endianness, true) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Xword r_info; // Symbol table index and type of relocation to apply + Elf_Sxword r_addend; // Compute value for relocatable field by adding this. +}; + +template<support::endianness target_endianness, bool is64Bits, bool isRela> +struct Elf_Rel_Impl; + +template<support::endianness target_endianness, bool isRela> +struct Elf_Rel_Impl<target_endianness, true, isRela> + : Elf_Rel_Base<target_endianness, true, isRela> { + using Elf_Rel_Base<target_endianness, true, isRela>::r_info; + LLVM_ELF_IMPORT_TYPES(target_endianness, true) + + // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE, + // and ELF64_R_INFO macros defined in the ELF specification: + uint64_t getSymbol() const { return (r_info >> 32); } + unsigned char getType() const { + return (unsigned char) (r_info & 0xffffffffL); + } + void setSymbol(uint64_t s) { setSymbolAndType(s, getType()); } + void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } + void setSymbolAndType(uint64_t s, unsigned char t) { + r_info = (s << 32) + (t&0xffffffffL); + } +}; + +template<support::endianness target_endianness, bool isRela> +struct Elf_Rel_Impl<target_endianness, false, isRela> + : Elf_Rel_Base<target_endianness, false, isRela> { + using Elf_Rel_Base<target_endianness, false, isRela>::r_info; + LLVM_ELF_IMPORT_TYPES(target_endianness, false) + + // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE, + // and ELF32_R_INFO macros defined in the ELF specification: + uint32_t getSymbol() const { return (r_info >> 8); } + unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); } + void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); } + void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } + void setSymbolAndType(uint32_t s, unsigned char t) { + r_info = (s << 8) + t; + } +}; + + +template<support::endianness target_endianness, bool is64Bits> +class ELFObjectFile : public ObjectFile { + LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) + + typedef Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr; + typedef Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym; + typedef Elf_Dyn_Impl<target_endianness, is64Bits> Elf_Dyn; + typedef Elf_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel; + typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela; + typedef Elf_Verdef_Impl<target_endianness, is64Bits> Elf_Verdef; + typedef Elf_Verdaux_Impl<target_endianness, is64Bits> Elf_Verdaux; + typedef Elf_Verneed_Impl<target_endianness, is64Bits> Elf_Verneed; + typedef Elf_Vernaux_Impl<target_endianness, is64Bits> Elf_Vernaux; + typedef Elf_Versym_Impl<target_endianness, is64Bits> Elf_Versym; + typedef DynRefImpl<target_endianness, is64Bits> DynRef; + typedef content_iterator<DynRef> dyn_iterator; + +protected: + struct Elf_Ehdr { + unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes + Elf_Half e_type; // Type of file (see ET_*) + Elf_Half e_machine; // Required architecture for this file (see EM_*) + Elf_Word e_version; // Must be equal to 1 + 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]; } + }; + // This flag is used for classof, to distinguish ELFObjectFile from + // its subclass. If more subclasses will be created, this flag will + // have to become an enum. + bool isDyldELFObject; + +private: + typedef SmallVector<const Elf_Shdr*, 1> Sections_t; + typedef DenseMap<unsigned, unsigned> IndexMap_t; + typedef DenseMap<const Elf_Shdr*, SmallVector<uint32_t, 1> > RelocMap_t; + + const Elf_Ehdr *Header; + const Elf_Shdr *SectionHeaderTable; + const Elf_Shdr *dot_shstrtab_sec; // Section header string table. + const Elf_Shdr *dot_strtab_sec; // Symbol header string table. + const Elf_Shdr *dot_dynstr_sec; // Dynamic symbol string table. + + // SymbolTableSections[0] always points to the dynamic string table section + // header, or NULL if there is no dynamic string table. + Sections_t SymbolTableSections; + IndexMap_t SymbolTableSectionsIndexMap; + DenseMap<const Elf_Sym*, ELF::Elf64_Word> ExtendedSymbolTable; + + const Elf_Shdr *dot_dynamic_sec; // .dynamic + const Elf_Shdr *dot_gnu_version_sec; // .gnu.version + const Elf_Shdr *dot_gnu_version_r_sec; // .gnu.version_r + const Elf_Shdr *dot_gnu_version_d_sec; // .gnu.version_d + + // Pointer to SONAME entry in dynamic string table + // This is set the first time getLoadName is called. + mutable const char *dt_soname; + + // Records for each version index the corresponding Verdef or Vernaux entry. + // This is filled the first time LoadVersionMap() is called. + class VersionMapEntry : public PointerIntPair<const void*, 1> { + public: + // If the integer is 0, this is an Elf_Verdef*. + // If the integer is 1, this is an Elf_Vernaux*. + VersionMapEntry() : PointerIntPair<const void*, 1>(NULL, 0) { } + VersionMapEntry(const Elf_Verdef *verdef) + : PointerIntPair<const void*, 1>(verdef, 0) { } + VersionMapEntry(const Elf_Vernaux *vernaux) + : PointerIntPair<const void*, 1>(vernaux, 1) { } + bool isNull() const { return getPointer() == NULL; } + bool isVerdef() const { return !isNull() && getInt() == 0; } + bool isVernaux() const { return !isNull() && getInt() == 1; } + const Elf_Verdef *getVerdef() const { + return isVerdef() ? (const Elf_Verdef*)getPointer() : NULL; + } + const Elf_Vernaux *getVernaux() const { + return isVernaux() ? (const Elf_Vernaux*)getPointer() : NULL; + } + }; + mutable SmallVector<VersionMapEntry, 16> VersionMap; + void LoadVersionDefs(const Elf_Shdr *sec) const; + void LoadVersionNeeds(const Elf_Shdr *ec) const; + void LoadVersionMap() const; + + /// @brief Map sections to an array of relocation sections that reference + /// them sorted by section index. + RelocMap_t SectionRelocMap; + + /// @brief Get the relocation section that contains \a Rel. + const Elf_Shdr *getRelSection(DataRefImpl Rel) const { + return getSection(Rel.w.b); + } + + bool isRelocationHasAddend(DataRefImpl Rel) const; + template<typename T> + const T *getEntry(uint16_t Section, uint32_t Entry) const; + template<typename T> + const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const; + const Elf_Shdr *getSection(DataRefImpl index) const; + const Elf_Shdr *getSection(uint32_t index) const; + const Elf_Rel *getRel(DataRefImpl Rel) const; + const Elf_Rela *getRela(DataRefImpl Rela) const; + const char *getString(uint32_t section, uint32_t offset) const; + const char *getString(const Elf_Shdr *section, uint32_t offset) const; + error_code getSymbolName(const Elf_Shdr *section, + const Elf_Sym *Symb, + StringRef &Res) const; + error_code getSymbolVersion(const Elf_Shdr *section, + const Elf_Sym *Symb, + StringRef &Version, + bool &IsDefault) const; + void VerifyStrTab(const Elf_Shdr *sh) const; + +protected: + const Elf_Sym *getSymbol(DataRefImpl Symb) const; // FIXME: Should be private? + void validateSymbol(DataRefImpl Symb) const; + +public: + const Elf_Dyn *getDyn(DataRefImpl DynData) const; + error_code getSymbolVersion(SymbolRef Symb, StringRef &Version, + bool &IsDefault) const; +protected: + virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const; + virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const; + virtual error_code getSymbolFileOffset(DataRefImpl Symb, uint64_t &Res) const; + virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const; + virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const; + virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const; + virtual error_code getSymbolFlags(DataRefImpl Symb, uint32_t &Res) const; + virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::Type &Res) const; + virtual error_code getSymbolSection(DataRefImpl Symb, + section_iterator &Res) const; + + friend class DynRefImpl<target_endianness, is64Bits>; + virtual error_code getDynNext(DataRefImpl DynData, DynRef &Result) const; + + virtual error_code getLibraryNext(DataRefImpl Data, LibraryRef &Result) const; + virtual error_code getLibraryPath(DataRefImpl Data, StringRef &Res) const; + + virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const; + virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const; + virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const; + virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const; + virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const; + virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const; + virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionRequiredForExecution(DataRefImpl Sec, + bool &Res) const; + virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const; + virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb, + bool &Result) const; + virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const; + virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const; + + virtual error_code getRelocationNext(DataRefImpl Rel, + RelocationRef &Res) const; + virtual error_code getRelocationAddress(DataRefImpl Rel, + uint64_t &Res) const; + virtual error_code getRelocationOffset(DataRefImpl Rel, + uint64_t &Res) const; + virtual error_code getRelocationSymbol(DataRefImpl Rel, + SymbolRef &Res) const; + virtual error_code getRelocationType(DataRefImpl Rel, + uint64_t &Res) const; + virtual error_code getRelocationTypeName(DataRefImpl Rel, + SmallVectorImpl<char> &Result) const; + virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel, + int64_t &Res) const; + virtual error_code getRelocationValueString(DataRefImpl Rel, + SmallVectorImpl<char> &Result) const; + +public: + ELFObjectFile(MemoryBuffer *Object, error_code &ec); + virtual symbol_iterator begin_symbols() const; + virtual symbol_iterator end_symbols() const; + + virtual symbol_iterator begin_dynamic_symbols() const; + virtual symbol_iterator end_dynamic_symbols() const; + + virtual section_iterator begin_sections() const; + virtual section_iterator end_sections() const; + + virtual library_iterator begin_libraries_needed() const; + virtual library_iterator end_libraries_needed() const; + + virtual dyn_iterator begin_dynamic_table() const; + virtual dyn_iterator end_dynamic_table() const; + + virtual uint8_t getBytesInAddress() const; + virtual StringRef getFileFormatName() const; + virtual StringRef getObjectType() const { return "ELF"; } + virtual unsigned getArch() const; + virtual StringRef getLoadName() const; + + uint64_t getNumSections() const; + uint64_t getStringTableIndex() const; + ELF::Elf64_Word getSymbolTableIndex(const Elf_Sym *symb) const; + const Elf_Shdr *getSection(const Elf_Sym *symb) const; + + // Methods for type inquiry through isa, cast, and dyn_cast + bool isDyldType() const { return isDyldELFObject; } + static inline bool classof(const Binary *v) { + return v->getType() == getELFType(target_endianness == support::little, + is64Bits); + } + static inline bool classof(const ELFObjectFile *v) { return true; } +}; + +// Iterate through the version definitions, and place each Elf_Verdef +// in the VersionMap according to its index. +template<support::endianness target_endianness, bool is64Bits> +void ELFObjectFile<target_endianness, is64Bits>:: + LoadVersionDefs(const Elf_Shdr *sec) const { + unsigned vd_size = sec->sh_size; // Size of section in bytes + unsigned vd_count = sec->sh_info; // Number of Verdef entries + const char *sec_start = (const char*)base() + sec->sh_offset; + const char *sec_end = sec_start + vd_size; + // The first Verdef entry is at the start of the section. + const char *p = sec_start; + for (unsigned i = 0; i < vd_count; i++) { + if (p + sizeof(Elf_Verdef) > sec_end) + report_fatal_error("Section ended unexpectedly while scanning " + "version definitions."); + const Elf_Verdef *vd = reinterpret_cast<const Elf_Verdef *>(p); + if (vd->vd_version != ELF::VER_DEF_CURRENT) + report_fatal_error("Unexpected verdef version"); + size_t index = vd->vd_ndx & ELF::VERSYM_VERSION; + if (index >= VersionMap.size()) + VersionMap.resize(index+1); + VersionMap[index] = VersionMapEntry(vd); + p += vd->vd_next; + } +} + +// Iterate through the versions needed section, and place each Elf_Vernaux +// in the VersionMap according to its index. +template<support::endianness target_endianness, bool is64Bits> +void ELFObjectFile<target_endianness, is64Bits>:: + LoadVersionNeeds(const Elf_Shdr *sec) const { + unsigned vn_size = sec->sh_size; // Size of section in bytes + unsigned vn_count = sec->sh_info; // Number of Verneed entries + const char *sec_start = (const char*)base() + sec->sh_offset; + const char *sec_end = sec_start + vn_size; + // The first Verneed entry is at the start of the section. + const char *p = sec_start; + for (unsigned i = 0; i < vn_count; i++) { + if (p + sizeof(Elf_Verneed) > sec_end) + report_fatal_error("Section ended unexpectedly while scanning " + "version needed records."); + const Elf_Verneed *vn = reinterpret_cast<const Elf_Verneed *>(p); + if (vn->vn_version != ELF::VER_NEED_CURRENT) + report_fatal_error("Unexpected verneed version"); + // Iterate through the Vernaux entries + const char *paux = p + vn->vn_aux; + for (unsigned j = 0; j < vn->vn_cnt; j++) { + if (paux + sizeof(Elf_Vernaux) > sec_end) + report_fatal_error("Section ended unexpected while scanning auxiliary " + "version needed records."); + const Elf_Vernaux *vna = reinterpret_cast<const Elf_Vernaux *>(paux); + size_t index = vna->vna_other & ELF::VERSYM_VERSION; + if (index >= VersionMap.size()) + VersionMap.resize(index+1); + VersionMap[index] = VersionMapEntry(vna); + paux += vna->vna_next; + } + p += vn->vn_next; + } +} + +template<support::endianness target_endianness, bool is64Bits> +void ELFObjectFile<target_endianness, is64Bits>::LoadVersionMap() const { + // If there is no dynamic symtab or version table, there is nothing to do. + if (SymbolTableSections[0] == NULL || dot_gnu_version_sec == NULL) + return; + + // Has the VersionMap already been loaded? + if (VersionMap.size() > 0) + return; + + // The first two version indexes are reserved. + // Index 0 is LOCAL, index 1 is GLOBAL. + VersionMap.push_back(VersionMapEntry()); + VersionMap.push_back(VersionMapEntry()); + + if (dot_gnu_version_d_sec) + LoadVersionDefs(dot_gnu_version_d_sec); + + if (dot_gnu_version_r_sec) + LoadVersionNeeds(dot_gnu_version_r_sec); +} + +template<support::endianness target_endianness, bool is64Bits> +void ELFObjectFile<target_endianness, is64Bits> + ::validateSymbol(DataRefImpl Symb) const { + const Elf_Sym *symb = getSymbol(Symb); + const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; + // FIXME: We really need to do proper error handling in the case of an invalid + // input file. Because we don't use exceptions, I think we'll just pass + // an error object around. + if (!( symb + && SymbolTableSection + && symb >= (const Elf_Sym*)(base() + + SymbolTableSection->sh_offset) + && symb < (const Elf_Sym*)(base() + + SymbolTableSection->sh_offset + + SymbolTableSection->sh_size))) + // FIXME: Proper error handling. + report_fatal_error("Symb must point to a valid symbol!"); +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolNext(DataRefImpl Symb, + SymbolRef &Result) const { + validateSymbol(Symb); + const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; + + ++Symb.d.a; + // Check to see if we are at the end of this symbol table. + if (Symb.d.a >= SymbolTableSection->getEntityCount()) { + // We are at the end. If there are other symbol tables, jump to them. + // If the symbol table is .dynsym, we are iterating dynamic symbols, + // and there is only one table of these. + if (Symb.d.b != 0) { + ++Symb.d.b; + Symb.d.a = 1; // The 0th symbol in ELF is fake. + } + // Otherwise return the terminator. + if (Symb.d.b == 0 || Symb.d.b >= SymbolTableSections.size()) { + Symb.d.a = std::numeric_limits<uint32_t>::max(); + Symb.d.b = std::numeric_limits<uint32_t>::max(); + } + } + + Result = SymbolRef(Symb, this); + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolName(DataRefImpl Symb, + StringRef &Result) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + return getSymbolName(SymbolTableSections[Symb.d.b], symb, Result); +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolVersion(SymbolRef SymRef, + StringRef &Version, + bool &IsDefault) const { + DataRefImpl Symb = SymRef.getRawDataRefImpl(); + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + return getSymbolVersion(SymbolTableSections[Symb.d.b], symb, + Version, IsDefault); +} + +template<support::endianness target_endianness, bool is64Bits> +ELF::Elf64_Word ELFObjectFile<target_endianness, is64Bits> + ::getSymbolTableIndex(const Elf_Sym *symb) const { + if (symb->st_shndx == ELF::SHN_XINDEX) + return ExtendedSymbolTable.lookup(symb); + return symb->st_shndx; +} + +template<support::endianness target_endianness, bool is64Bits> +const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * +ELFObjectFile<target_endianness, is64Bits> + ::getSection(const Elf_Sym *symb) const { + if (symb->st_shndx == ELF::SHN_XINDEX) + return getSection(ExtendedSymbolTable.lookup(symb)); + if (symb->st_shndx >= ELF::SHN_LORESERVE) + return 0; + return getSection(symb->st_shndx); +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolFileOffset(DataRefImpl Symb, + uint64_t &Result) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + const Elf_Shdr *Section; + switch (getSymbolTableIndex(symb)) { + case ELF::SHN_COMMON: + // Unintialized symbols have no offset in the object file + case ELF::SHN_UNDEF: + Result = UnknownAddressOrSize; + return object_error::success; + case ELF::SHN_ABS: + Result = symb->st_value; + return object_error::success; + default: Section = getSection(symb); + } + + switch (symb->getType()) { + case ELF::STT_SECTION: + Result = Section ? Section->sh_addr : UnknownAddressOrSize; + return object_error::success; + case ELF::STT_FUNC: + case ELF::STT_OBJECT: + case ELF::STT_NOTYPE: + Result = symb->st_value + + (Section ? Section->sh_offset : 0); + return object_error::success; + default: + Result = UnknownAddressOrSize; + return object_error::success; + } +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolAddress(DataRefImpl Symb, + uint64_t &Result) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + const Elf_Shdr *Section; + switch (getSymbolTableIndex(symb)) { + case ELF::SHN_COMMON: + case ELF::SHN_UNDEF: + Result = UnknownAddressOrSize; + return object_error::success; + case ELF::SHN_ABS: + Result = symb->st_value; + return object_error::success; + default: Section = getSection(symb); + } + + switch (symb->getType()) { + case ELF::STT_SECTION: + Result = Section ? Section->sh_addr : UnknownAddressOrSize; + return object_error::success; + case ELF::STT_FUNC: + case ELF::STT_OBJECT: + case ELF::STT_NOTYPE: + Result = symb->st_value + (Section ? Section->sh_addr : 0); + return object_error::success; + default: + Result = UnknownAddressOrSize; + return object_error::success; + } +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolSize(DataRefImpl Symb, + uint64_t &Result) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + if (symb->st_size == 0) + Result = UnknownAddressOrSize; + Result = symb->st_size; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolNMTypeChar(DataRefImpl Symb, + char &Result) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + const Elf_Shdr *Section = getSection(symb); + + char ret = '?'; + + if (Section) { + switch (Section->sh_type) { + case ELF::SHT_PROGBITS: + case ELF::SHT_DYNAMIC: + switch (Section->sh_flags) { + case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR): + ret = 't'; break; + case (ELF::SHF_ALLOC | ELF::SHF_WRITE): + ret = 'd'; break; + case ELF::SHF_ALLOC: + case (ELF::SHF_ALLOC | ELF::SHF_MERGE): + case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS): + ret = 'r'; break; + } + break; + case ELF::SHT_NOBITS: ret = 'b'; + } + } + + switch (getSymbolTableIndex(symb)) { + case ELF::SHN_UNDEF: + if (ret == '?') + ret = 'U'; + break; + case ELF::SHN_ABS: ret = 'a'; break; + case ELF::SHN_COMMON: ret = 'c'; break; + } + + switch (symb->getBinding()) { + case ELF::STB_GLOBAL: ret = ::toupper(ret); break; + case ELF::STB_WEAK: + if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) + ret = 'w'; + else + if (symb->getType() == ELF::STT_OBJECT) + ret = 'V'; + else + ret = 'W'; + } + + if (ret == '?' && symb->getType() == ELF::STT_SECTION) { + StringRef name; + if (error_code ec = getSymbolName(Symb, name)) + return ec; + Result = StringSwitch<char>(name) + .StartsWith(".debug", 'N') + .StartsWith(".note", 'n') + .Default('?'); + return object_error::success; + } + + Result = ret; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolType(DataRefImpl Symb, + SymbolRef::Type &Result) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + + switch (symb->getType()) { + case ELF::STT_NOTYPE: + Result = SymbolRef::ST_Unknown; + break; + case ELF::STT_SECTION: + Result = SymbolRef::ST_Debug; + break; + case ELF::STT_FILE: + Result = SymbolRef::ST_File; + break; + case ELF::STT_FUNC: + Result = SymbolRef::ST_Function; + break; + case ELF::STT_OBJECT: + case ELF::STT_COMMON: + case ELF::STT_TLS: + Result = SymbolRef::ST_Data; + break; + default: + Result = SymbolRef::ST_Other; + break; + } + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolFlags(DataRefImpl Symb, + uint32_t &Result) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + + Result = SymbolRef::SF_None; + + if (symb->getBinding() != ELF::STB_LOCAL) + Result |= SymbolRef::SF_Global; + + if (symb->getBinding() == ELF::STB_WEAK) + Result |= SymbolRef::SF_Weak; + + if (symb->st_shndx == ELF::SHN_ABS) + Result |= SymbolRef::SF_Absolute; + + if (symb->getType() == ELF::STT_FILE || + symb->getType() == ELF::STT_SECTION) + Result |= SymbolRef::SF_FormatSpecific; + + if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) + Result |= SymbolRef::SF_Undefined; + + if (symb->getType() == ELF::STT_COMMON || + getSymbolTableIndex(symb) == ELF::SHN_COMMON) + Result |= SymbolRef::SF_Common; + + if (symb->getType() == ELF::STT_TLS) + Result |= SymbolRef::SF_ThreadLocal; + + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolSection(DataRefImpl Symb, + section_iterator &Res) const { + validateSymbol(Symb); + const Elf_Sym *symb = getSymbol(Symb); + const Elf_Shdr *sec = getSection(symb); + if (!sec) + Res = end_sections(); + else { + DataRefImpl Sec; + Sec.p = reinterpret_cast<intptr_t>(sec); + Res = section_iterator(SectionRef(Sec, this)); + } + 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> + ::getSectionAlignment(DataRefImpl Sec, + uint64_t &Result) const { + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + Result = sec->sh_addralign; + 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> + ::isSectionData(DataRefImpl Sec, + bool &Result) const { + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) + && sec->sh_type == ELF::SHT_PROGBITS) + Result = true; + else + Result = false; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::isSectionBSS(DataRefImpl Sec, + bool &Result) const { + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) + && sec->sh_type == ELF::SHT_NOBITS) + Result = true; + else + Result = false; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::isSectionRequiredForExecution(DataRefImpl Sec, + bool &Result) const { + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + if (sec->sh_flags & ELF::SHF_ALLOC) + Result = true; + else + Result = false; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::isSectionVirtual(DataRefImpl Sec, + bool &Result) const { + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + if (sec->sh_type == ELF::SHT_NOBITS) + Result = true; + else + Result = false; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits>::isSectionZeroInit(DataRefImpl Sec, + bool &Result) const { + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + // For ELF, all zero-init sections are virtual (that is, they occupy no space + // in the object image) and vice versa. + if (sec->sh_flags & ELF::SHT_NOBITS) + 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> +relocation_iterator ELFObjectFile<target_endianness, is64Bits> + ::getSectionRelBegin(DataRefImpl Sec) const { + DataRefImpl RelData; + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); + if (sec != 0 && ittr != SectionRelocMap.end()) { + RelData.w.a = getSection(ittr->second[0])->sh_info; + RelData.w.b = ittr->second[0]; + RelData.w.c = 0; + } + return relocation_iterator(RelocationRef(RelData, this)); +} + +template<support::endianness target_endianness, bool is64Bits> +relocation_iterator ELFObjectFile<target_endianness, is64Bits> + ::getSectionRelEnd(DataRefImpl Sec) const { + DataRefImpl RelData; + const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); + typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); + if (sec != 0 && ittr != SectionRelocMap.end()) { + // Get the index of the last relocation section for this section. + std::size_t relocsecindex = ittr->second[ittr->second.size() - 1]; + const Elf_Shdr *relocsec = getSection(relocsecindex); + RelData.w.a = relocsec->sh_info; + RelData.w.b = relocsecindex; + RelData.w.c = relocsec->sh_size / relocsec->sh_entsize; + } + return relocation_iterator(RelocationRef(RelData, this)); +} + +// Relocations +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationNext(DataRefImpl Rel, + RelocationRef &Result) const { + ++Rel.w.c; + const Elf_Shdr *relocsec = getSection(Rel.w.b); + if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) { + // We have reached the end of the relocations for this section. See if there + // is another relocation section. + typename RelocMap_t::mapped_type relocseclist = + SectionRelocMap.lookup(getSection(Rel.w.a)); + + // Do a binary search for the current reloc section index (which must be + // present). Then get the next one. + typename RelocMap_t::mapped_type::const_iterator loc = + std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b); + ++loc; + + // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel + // to the end iterator. + if (loc != relocseclist.end()) { + Rel.w.b = *loc; + Rel.w.a = 0; + } + } + Result = RelocationRef(Rel, this); + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationSymbol(DataRefImpl Rel, + SymbolRef &Result) const { + uint32_t symbolIdx; + const Elf_Shdr *sec = getSection(Rel.w.b); + switch (sec->sh_type) { + default : + report_fatal_error("Invalid section type in Rel!"); + case ELF::SHT_REL : { + symbolIdx = getRel(Rel)->getSymbol(); + break; + } + case ELF::SHT_RELA : { + symbolIdx = getRela(Rel)->getSymbol(); + break; + } + } + DataRefImpl SymbolData; + IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link); + if (it == SymbolTableSectionsIndexMap.end()) + report_fatal_error("Relocation symbol table not found!"); + SymbolData.d.a = symbolIdx; + SymbolData.d.b = it->second; + Result = SymbolRef(SymbolData, this); + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationAddress(DataRefImpl Rel, + uint64_t &Result) const { + uint64_t offset; + const Elf_Shdr *sec = getSection(Rel.w.b); + switch (sec->sh_type) { + default : + report_fatal_error("Invalid section type in Rel!"); + case ELF::SHT_REL : { + offset = getRel(Rel)->r_offset; + break; + } + case ELF::SHT_RELA : { + offset = getRela(Rel)->r_offset; + break; + } + } + + Result = offset; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationOffset(DataRefImpl Rel, + uint64_t &Result) const { + uint64_t offset; + const Elf_Shdr *sec = getSection(Rel.w.b); + switch (sec->sh_type) { + default : + report_fatal_error("Invalid section type in Rel!"); + case ELF::SHT_REL : { + offset = getRel(Rel)->r_offset; + break; + } + case ELF::SHT_RELA : { + offset = getRela(Rel)->r_offset; + break; + } + } + + Result = offset - sec->sh_addr; + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationType(DataRefImpl Rel, + uint64_t &Result) const { + const Elf_Shdr *sec = getSection(Rel.w.b); + switch (sec->sh_type) { + default : + report_fatal_error("Invalid section type in Rel!"); + case ELF::SHT_REL : { + Result = getRel(Rel)->getType(); + break; + } + case ELF::SHT_RELA : { + Result = getRela(Rel)->getType(); + break; + } + } + return object_error::success; +} + +#define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \ + case ELF::enum: res = #enum; break; + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationTypeName(DataRefImpl Rel, + SmallVectorImpl<char> &Result) const { + const Elf_Shdr *sec = getSection(Rel.w.b); + uint8_t type; + StringRef res; + switch (sec->sh_type) { + default : + return object_error::parse_failed; + case ELF::SHT_REL : { + type = getRel(Rel)->getType(); + break; + } + case ELF::SHT_RELA : { + type = getRela(Rel)->getType(); + break; + } + } + switch (Header->e_machine) { + case ELF::EM_X86_64: + switch (type) { + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC); + default: + res = "Unknown"; + } + break; + case ELF::EM_386: + switch (type) { + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC); + LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE); + default: + res = "Unknown"; + } + break; + default: + res = "Unknown"; + } + Result.append(res.begin(), res.end()); + return object_error::success; +} + +#undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationAdditionalInfo(DataRefImpl Rel, + int64_t &Result) const { + const Elf_Shdr *sec = getSection(Rel.w.b); + switch (sec->sh_type) { + default : + report_fatal_error("Invalid section type in Rel!"); + case ELF::SHT_REL : { + Result = 0; + return object_error::success; + } + case ELF::SHT_RELA : { + Result = getRela(Rel)->r_addend; + return object_error::success; + } + } +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getRelocationValueString(DataRefImpl Rel, + SmallVectorImpl<char> &Result) const { + const Elf_Shdr *sec = getSection(Rel.w.b); + uint8_t type; + StringRef res; + int64_t addend = 0; + uint16_t symbol_index = 0; + switch (sec->sh_type) { + default : + return object_error::parse_failed; + case ELF::SHT_REL : { + type = getRel(Rel)->getType(); + symbol_index = getRel(Rel)->getSymbol(); + // TODO: Read implicit addend from section data. + break; + } + case ELF::SHT_RELA : { + type = getRela(Rel)->getType(); + symbol_index = getRela(Rel)->getSymbol(); + addend = getRela(Rel)->r_addend; + break; + } + } + const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index); + StringRef symname; + if (error_code ec = getSymbolName(getSection(sec->sh_link), symb, symname)) + return ec; + switch (Header->e_machine) { + case ELF::EM_X86_64: + switch (type) { + case ELF::R_X86_64_32S: + res = symname; + break; + case ELF::R_X86_64_PC32: { + std::string fmtbuf; + raw_string_ostream fmt(fmtbuf); + fmt << symname << (addend < 0 ? "" : "+") << addend << "-P"; + fmt.flush(); + Result.append(fmtbuf.begin(), fmtbuf.end()); + } + break; + default: + res = "Unknown"; + } + break; + default: + res = "Unknown"; + } + if (Result.empty()) + Result.append(res.begin(), res.end()); + return object_error::success; +} + +// Verify that the last byte in the string table in a null. +template<support::endianness target_endianness, bool is64Bits> +void ELFObjectFile<target_endianness, is64Bits> + ::VerifyStrTab(const Elf_Shdr *sh) const { + const char *strtab = (const char*)base() + sh->sh_offset; + if (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> +ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object + , error_code &ec) + : ObjectFile(getELFType(target_endianness == support::little, is64Bits), + Object, ec) + , isDyldELFObject(false) + , SectionHeaderTable(0) + , dot_shstrtab_sec(0) + , dot_strtab_sec(0) + , dot_dynstr_sec(0) + , dot_dynamic_sec(0) + , dot_gnu_version_sec(0) + , dot_gnu_version_r_sec(0) + , dot_gnu_version_d_sec(0) + , dt_soname(0) + { + + const uint64_t FileSize = Data->getBufferSize(); + + if (sizeof(Elf_Ehdr) > FileSize) + // FIXME: Proper error handling. + report_fatal_error("File too short!"); + + Header = reinterpret_cast<const Elf_Ehdr *>(base()); + + if (Header->e_shoff == 0) + return; + + const uint64_t SectionTableOffset = Header->e_shoff; + + if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize) + // FIXME: Proper error handling. + report_fatal_error("Section header table goes past end of file!"); + + // The getNumSections() call below depends on SectionHeaderTable being set. + SectionHeaderTable = + reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset); + const uint64_t SectionTableSize = getNumSections() * Header->e_shentsize; + + if (SectionTableOffset + SectionTableSize > FileSize) + // 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_SYMTAB. + const Elf_Shdr* SymbolTableSectionHeaderIndex = 0; + const Elf_Shdr* sh = SectionHeaderTable; + + // Reserve SymbolTableSections[0] for .dynsym + SymbolTableSections.push_back(NULL); + + for (uint64_t i = 0, e = getNumSections(); i != e; ++i) { + switch (sh->sh_type) { + case ELF::SHT_SYMTAB_SHNDX: { + if (SymbolTableSectionHeaderIndex) + // FIXME: Proper error handling. + report_fatal_error("More than one .symtab_shndx!"); + SymbolTableSectionHeaderIndex = sh; + break; + } + case ELF::SHT_SYMTAB: { + SymbolTableSectionsIndexMap[i] = SymbolTableSections.size(); + SymbolTableSections.push_back(sh); + break; + } + case ELF::SHT_DYNSYM: { + if (SymbolTableSections[0] != NULL) + // FIXME: Proper error handling. + report_fatal_error("More than one .dynsym!"); + SymbolTableSectionsIndexMap[i] = 0; + SymbolTableSections[0] = sh; + break; + } + case ELF::SHT_REL: + case ELF::SHT_RELA: { + SectionRelocMap[getSection(sh->sh_info)].push_back(i); + break; + } + case ELF::SHT_DYNAMIC: { + if (dot_dynamic_sec != NULL) + // FIXME: Proper error handling. + report_fatal_error("More than one .dynamic!"); + dot_dynamic_sec = sh; + break; + } + case ELF::SHT_GNU_versym: { + if (dot_gnu_version_sec != NULL) + // FIXME: Proper error handling. + report_fatal_error("More than one .gnu.version section!"); + dot_gnu_version_sec = sh; + break; + } + case ELF::SHT_GNU_verdef: { + if (dot_gnu_version_d_sec != NULL) + // FIXME: Proper error handling. + report_fatal_error("More than one .gnu.version_d section!"); + dot_gnu_version_d_sec = sh; + break; + } + case ELF::SHT_GNU_verneed: { + if (dot_gnu_version_r_sec != NULL) + // FIXME: Proper error handling. + report_fatal_error("More than one .gnu.version_r section!"); + dot_gnu_version_r_sec = sh; + break; + } + } + ++sh; + } + + // Sort section relocation lists by index. + for (typename RelocMap_t::iterator i = SectionRelocMap.begin(), + e = SectionRelocMap.end(); i != e; ++i) { + std::sort(i->second.begin(), i->second.end()); + } + + // Get string table sections. + dot_shstrtab_sec = getSection(getStringTableIndex()); + if (dot_shstrtab_sec) { + // Verify that the last byte in the string table in a null. + VerifyStrTab(dot_shstrtab_sec); + } + + // Merge this into the above loop. + for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable), + *e = i + getNumSections() * 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; + VerifyStrTab(dot_strtab_sec); + } else if (SectionName == ".dynstr") { + if (dot_dynstr_sec != 0) + // FIXME: Proper error handling. + report_fatal_error("Already found section named .dynstr!"); + dot_dynstr_sec = sh; + VerifyStrTab(dot_dynstr_sec); + } + } + } + + // Build symbol name side-mapping if there is one. + if (SymbolTableSectionHeaderIndex) { + const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() + + SymbolTableSectionHeaderIndex->sh_offset); + error_code ec; + for (symbol_iterator si = begin_symbols(), + se = end_symbols(); si != se; si.increment(ec)) { + if (ec) + report_fatal_error("Fewer extended symbol table entries than symbols!"); + if (*ShndxTable != ELF::SHN_UNDEF) + ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable; + ++ShndxTable; + } + } +} + +template<support::endianness target_endianness, bool is64Bits> +symbol_iterator ELFObjectFile<target_endianness, is64Bits> + ::begin_symbols() const { + DataRefImpl SymbolData; + if (SymbolTableSections.size() <= 1) { + 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 = 1; // The 0th table is .dynsym + } + return symbol_iterator(SymbolRef(SymbolData, this)); +} + +template<support::endianness target_endianness, bool is64Bits> +symbol_iterator ELFObjectFile<target_endianness, is64Bits> + ::end_symbols() const { + DataRefImpl 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> +symbol_iterator ELFObjectFile<target_endianness, is64Bits> + ::begin_dynamic_symbols() const { + DataRefImpl SymbolData; + if (SymbolTableSections[0] == NULL) { + 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; // The 0th table is .dynsym + } + return symbol_iterator(SymbolRef(SymbolData, this)); +} + +template<support::endianness target_endianness, bool is64Bits> +symbol_iterator ELFObjectFile<target_endianness, is64Bits> + ::end_dynamic_symbols() const { + DataRefImpl 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> +section_iterator ELFObjectFile<target_endianness, is64Bits> + ::begin_sections() const { + DataRefImpl ret; + ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff); + return section_iterator(SectionRef(ret, this)); +} + +template<support::endianness target_endianness, bool is64Bits> +section_iterator ELFObjectFile<target_endianness, is64Bits> + ::end_sections() const { + DataRefImpl ret; + ret.p = reinterpret_cast<intptr_t>(base() + + Header->e_shoff + + (Header->e_shentsize*getNumSections())); + return section_iterator(SectionRef(ret, this)); +} + +template<support::endianness target_endianness, bool is64Bits> +typename ELFObjectFile<target_endianness, is64Bits>::dyn_iterator +ELFObjectFile<target_endianness, is64Bits>::begin_dynamic_table() const { + DataRefImpl DynData; + if (dot_dynamic_sec == NULL || dot_dynamic_sec->sh_size == 0) { + DynData.d.a = std::numeric_limits<uint32_t>::max(); + } else { + DynData.d.a = 0; + } + return dyn_iterator(DynRef(DynData, this)); +} + +template<support::endianness target_endianness, bool is64Bits> +typename ELFObjectFile<target_endianness, is64Bits>::dyn_iterator +ELFObjectFile<target_endianness, is64Bits> + ::end_dynamic_table() const { + DataRefImpl DynData; + DynData.d.a = std::numeric_limits<uint32_t>::max(); + return dyn_iterator(DynRef(DynData, this)); +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getDynNext(DataRefImpl DynData, + DynRef &Result) const { + ++DynData.d.a; + + // Check to see if we are at the end of .dynamic + if (DynData.d.a >= dot_dynamic_sec->getEntityCount()) { + // We are at the end. Return the terminator. + DynData.d.a = std::numeric_limits<uint32_t>::max(); + } + + Result = DynRef(DynData, this); + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +StringRef +ELFObjectFile<target_endianness, is64Bits>::getLoadName() const { + if (!dt_soname) { + // Find the DT_SONAME entry + dyn_iterator it = begin_dynamic_table(); + dyn_iterator ie = end_dynamic_table(); + error_code ec; + while (it != ie) { + if (it->getTag() == ELF::DT_SONAME) + break; + it.increment(ec); + if (ec) + report_fatal_error("dynamic table iteration failed"); + } + if (it != ie) { + if (dot_dynstr_sec == NULL) + report_fatal_error("Dynamic string table is missing"); + dt_soname = getString(dot_dynstr_sec, it->getVal()); + } else { + dt_soname = ""; + } + } + return dt_soname; +} + +template<support::endianness target_endianness, bool is64Bits> +library_iterator ELFObjectFile<target_endianness, is64Bits> + ::begin_libraries_needed() const { + // Find the first DT_NEEDED entry + dyn_iterator i = begin_dynamic_table(); + dyn_iterator e = end_dynamic_table(); + error_code ec; + while (i != e) { + if (i->getTag() == ELF::DT_NEEDED) + break; + i.increment(ec); + if (ec) + report_fatal_error("dynamic table iteration failed"); + } + // Use the same DataRefImpl format as DynRef. + return library_iterator(LibraryRef(i->getRawDataRefImpl(), this)); +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getLibraryNext(DataRefImpl Data, + LibraryRef &Result) const { + // Use the same DataRefImpl format as DynRef. + dyn_iterator i = dyn_iterator(DynRef(Data, this)); + dyn_iterator e = end_dynamic_table(); + + // Skip the current dynamic table entry. + error_code ec; + if (i != e) { + i.increment(ec); + // TODO: proper error handling + if (ec) + report_fatal_error("dynamic table iteration failed"); + } + + // Find the next DT_NEEDED entry. + while (i != e) { + if (i->getTag() == ELF::DT_NEEDED) + break; + i.increment(ec); + if (ec) + report_fatal_error("dynamic table iteration failed"); + } + Result = LibraryRef(i->getRawDataRefImpl(), this); + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getLibraryPath(DataRefImpl Data, StringRef &Res) const { + dyn_iterator i = dyn_iterator(DynRef(Data, this)); + if (i == end_dynamic_table()) + report_fatal_error("getLibraryPath() called on iterator end"); + + if (i->getTag() != ELF::DT_NEEDED) + report_fatal_error("Invalid library_iterator"); + + // This uses .dynstr to lookup the name of the DT_NEEDED entry. + // THis works as long as DT_STRTAB == .dynstr. This is true most of + // the time, but the specification allows exceptions. + // TODO: This should really use DT_STRTAB instead. Doing this requires + // reading the program headers. + if (dot_dynstr_sec == NULL) + report_fatal_error("Dynamic string table is missing"); + Res = getString(dot_dynstr_sec, i->getVal()); + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +library_iterator ELFObjectFile<target_endianness, is64Bits> + ::end_libraries_needed() const { + dyn_iterator e = end_dynamic_table(); + // Use the same DataRefImpl format as DynRef. + return library_iterator(LibraryRef(e->getRawDataRefImpl(), 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"; + case ELF::EM_ARM: + return "ELF32-arm"; + 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; + case ELF::EM_ARM: + return Triple::arm; + default: + return Triple::UnknownArch; + } +} + +template<support::endianness target_endianness, bool is64Bits> +uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const { + assert(Header && "Header not initialized!"); + if (Header->e_shnum == ELF::SHN_UNDEF) { + assert(SectionHeaderTable && "SectionHeaderTable not initialized!"); + return SectionHeaderTable->sh_size; + } + return Header->e_shnum; +} + +template<support::endianness target_endianness, bool is64Bits> +uint64_t +ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const { + if (Header->e_shnum == ELF::SHN_UNDEF) { + if (Header->e_shstrndx == ELF::SHN_HIRESERVE) + return SectionHeaderTable->sh_link; + if (Header->e_shstrndx >= getNumSections()) + return 0; + } + return Header->e_shstrndx; +} + + +template<support::endianness target_endianness, bool is64Bits> +template<typename T> +inline const T * +ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section, + uint32_t Entry) const { + return getEntry<T>(getSection(Section), Entry); +} + +template<support::endianness target_endianness, bool is64Bits> +template<typename T> +inline const T * +ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section, + uint32_t Entry) const { + return reinterpret_cast<const T *>( + base() + + Section->sh_offset + + (Entry * Section->sh_entsize)); +} + +template<support::endianness target_endianness, bool is64Bits> +const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym * +ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const { + return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a); +} + +template<support::endianness target_endianness, bool is64Bits> +const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Dyn * +ELFObjectFile<target_endianness, is64Bits>::getDyn(DataRefImpl DynData) const { + return getEntry<Elf_Dyn>(dot_dynamic_sec, DynData.d.a); +} + +template<support::endianness target_endianness, bool is64Bits> +const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel * +ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const { + return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c); +} + +template<support::endianness target_endianness, bool is64Bits> +const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela * +ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const { + return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c); +} + +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 || sec->sh_type != ELF::SHT_DYNSYM) + // 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(uint32_t index) const { + if (index == 0) + return 0; + if (!SectionHeaderTable || index >= getNumSections()) + // 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(uint32_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; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolName(const Elf_Shdr *section, + const Elf_Sym *symb, + StringRef &Result) const { + if (symb->st_name == 0) { + const Elf_Shdr *section = getSection(symb); + if (!section) + Result = ""; + else + Result = getString(dot_shstrtab_sec, section->sh_name); + return object_error::success; + } + + if (section == SymbolTableSections[0]) { + // Symbol is in .dynsym, use .dynstr string table + Result = getString(dot_dynstr_sec, symb->st_name); + } else { + // Use the default symbol table name section. + Result = getString(dot_strtab_sec, symb->st_name); + } + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +error_code ELFObjectFile<target_endianness, is64Bits> + ::getSymbolVersion(const Elf_Shdr *section, + const Elf_Sym *symb, + StringRef &Version, + bool &IsDefault) const { + // Handle non-dynamic symbols. + if (section != SymbolTableSections[0]) { + // Non-dynamic symbols can have versions in their names + // A name of the form 'foo@V1' indicates version 'V1', non-default. + // A name of the form 'foo@@V2' indicates version 'V2', default version. + StringRef Name; + error_code ec = getSymbolName(section, symb, Name); + if (ec != object_error::success) + return ec; + size_t atpos = Name.find('@'); + if (atpos == StringRef::npos) { + Version = ""; + IsDefault = false; + return object_error::success; + } + ++atpos; + if (atpos < Name.size() && Name[atpos] == '@') { + IsDefault = true; + ++atpos; + } else { + IsDefault = false; + } + Version = Name.substr(atpos); + return object_error::success; + } + + // This is a dynamic symbol. Look in the GNU symbol version table. + if (dot_gnu_version_sec == NULL) { + // No version table. + Version = ""; + IsDefault = false; + return object_error::success; + } + + // Determine the position in the symbol table of this entry. + const char *sec_start = (const char*)base() + section->sh_offset; + size_t entry_index = ((const char*)symb - sec_start)/section->sh_entsize; + + // Get the corresponding version index entry + const Elf_Versym *vs = getEntry<Elf_Versym>(dot_gnu_version_sec, entry_index); + size_t version_index = vs->vs_index & ELF::VERSYM_VERSION; + + // Special markers for unversioned symbols. + if (version_index == ELF::VER_NDX_LOCAL || + version_index == ELF::VER_NDX_GLOBAL) { + Version = ""; + IsDefault = false; + return object_error::success; + } + + // Lookup this symbol in the version table + LoadVersionMap(); + if (version_index >= VersionMap.size() || VersionMap[version_index].isNull()) + report_fatal_error("Symbol has version index without corresponding " + "define or reference entry"); + const VersionMapEntry &entry = VersionMap[version_index]; + + // Get the version name string + size_t name_offset; + if (entry.isVerdef()) { + // The first Verdaux entry holds the name. + name_offset = entry.getVerdef()->getAux()->vda_name; + } else { + name_offset = entry.getVernaux()->vna_name; + } + Version = getString(dot_dynstr_sec, name_offset); + + // Set IsDefault + if (entry.isVerdef()) { + IsDefault = !(vs->vs_index & ELF::VERSYM_HIDDEN); + } else { + IsDefault = false; + } + + return object_error::success; +} + +template<support::endianness target_endianness, bool is64Bits> +inline DynRefImpl<target_endianness, is64Bits> + ::DynRefImpl(DataRefImpl DynP, const OwningType *Owner) + : DynPimpl(DynP) + , OwningObject(Owner) {} + +template<support::endianness target_endianness, bool is64Bits> +inline bool DynRefImpl<target_endianness, is64Bits> + ::operator==(const DynRefImpl &Other) const { + return DynPimpl == Other.DynPimpl; +} + +template<support::endianness target_endianness, bool is64Bits> +inline bool DynRefImpl<target_endianness, is64Bits> + ::operator <(const DynRefImpl &Other) const { + return DynPimpl < Other.DynPimpl; +} + +template<support::endianness target_endianness, bool is64Bits> +inline error_code DynRefImpl<target_endianness, is64Bits> + ::getNext(DynRefImpl &Result) const { + return OwningObject->getDynNext(DynPimpl, Result); +} + +template<support::endianness target_endianness, bool is64Bits> +inline int64_t DynRefImpl<target_endianness, is64Bits> + ::getTag() const { + return OwningObject->getDyn(DynPimpl)->d_tag; +} + +template<support::endianness target_endianness, bool is64Bits> +inline uint64_t DynRefImpl<target_endianness, is64Bits> + ::getVal() const { + return OwningObject->getDyn(DynPimpl)->d_un.d_val; +} + +template<support::endianness target_endianness, bool is64Bits> +inline uint64_t DynRefImpl<target_endianness, is64Bits> + ::getPtr() const { + return OwningObject->getDyn(DynPimpl)->d_un.d_ptr; +} + +template<support::endianness target_endianness, bool is64Bits> +inline DataRefImpl DynRefImpl<target_endianness, is64Bits> + ::getRawDataRefImpl() const { + return DynPimpl; +} + +/// This is a generic interface for retrieving GNU symbol version +/// information from an ELFObjectFile. +static inline error_code GetELFSymbolVersion(const ObjectFile *Obj, + const SymbolRef &Sym, + StringRef &Version, + bool &IsDefault) { + // Little-endian 32-bit + if (const ELFObjectFile<support::little, false> *ELFObj = + dyn_cast<ELFObjectFile<support::little, false> >(Obj)) + return ELFObj->getSymbolVersion(Sym, Version, IsDefault); + + // Big-endian 32-bit + if (const ELFObjectFile<support::big, false> *ELFObj = + dyn_cast<ELFObjectFile<support::big, false> >(Obj)) + return ELFObj->getSymbolVersion(Sym, Version, IsDefault); + + // Little-endian 64-bit + if (const ELFObjectFile<support::little, true> *ELFObj = + dyn_cast<ELFObjectFile<support::little, true> >(Obj)) + return ELFObj->getSymbolVersion(Sym, Version, IsDefault); + + // Big-endian 64-bit + if (const ELFObjectFile<support::big, true> *ELFObj = + dyn_cast<ELFObjectFile<support::big, true> >(Obj)) + return ELFObj->getSymbolVersion(Sym, Version, IsDefault); + + llvm_unreachable("Object passed to GetELFSymbolVersion() is not ELF"); +} + +} +} + +#endif |
