diff options
Diffstat (limited to 'lib/Object')
| -rw-r--r-- | lib/Object/ELFObjectFile.cpp | 1720 |
1 files changed, 25 insertions, 1695 deletions
diff --git a/lib/Object/ELFObjectFile.cpp b/lib/Object/ELFObjectFile.cpp index 1b29cf682f..ab5f8108af 100644 --- a/lib/Object/ELFObjectFile.cpp +++ b/lib/Object/ELFObjectFile.cpp @@ -7,1714 +7,44 @@ // //===----------------------------------------------------------------------===// // -// This file defines the ELFObjectFile and DyldELFObject classes. +// Part of the ELFObjectFile class implementation. // //===----------------------------------------------------------------------===// -#include "llvm/ADT/SmallVector.h" -#include "llvm/ADT/StringSwitch.h" -#include "llvm/ADT/Triple.h" -#include "llvm/ADT/DenseMap.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> +#include "llvm/Object/ELF.h" -using namespace llvm; -using namespace object; - -// Templates to choose Elf_Addr and Elf_Off depending on is64Bits. -namespace { -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; -}; -} - -namespace { -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. -namespace { -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; - } -}; -} - -namespace { -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); - } -}; -} - -namespace { -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; - } -}; +namespace llvm { -} +using namespace object; namespace { -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_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel; - typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela; - -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. - Sections_t SymbolTableSections; - IndexMap_t SymbolTableSectionsIndexMap; - DenseMap<const Elf_Sym*, ELF::Elf64_Word> ExtendedSymbolTable; - - /// @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_Sym *Symb, StringRef &Res) const; - -protected: - const Elf_Sym *getSymbol(DataRefImpl Symb) const; // FIXME: Should be private? - void validateSymbol(DataRefImpl Symb) 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 isSymbolInternal(DataRefImpl Symb, bool &Res) const; - virtual error_code isSymbolGlobal(DataRefImpl Symb, bool &Res) const; - virtual error_code isSymbolWeak(DataRefImpl Symb, bool &Res) const; - virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::Type &Res) const; - virtual error_code isSymbolAbsolute(DataRefImpl Symb, bool &Res) const; - virtual error_code getSymbolSection(DataRefImpl Symb, - section_iterator &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 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 section_iterator begin_sections() const; - virtual section_iterator end_sections() const; - - virtual uint8_t getBytesInAddress() const; - virtual StringRef getFileFormatName() const; - virtual unsigned getArch() 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() == Binary::isELF; - } - static inline bool classof(const ELFObjectFile *v) { return true; } -}; -} // end namespace - -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. - ++Symb.d.b; - Symb.d.a = 1; // The 0th symbol in ELF is fake. - // Otherwise return the terminator. - if (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(symb, Result); -} - -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); - - if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) { - Result = SymbolRef::ST_External; - return object_error::success; - } - - switch (symb->getType()) { - 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: - 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> - ::isSymbolGlobal(DataRefImpl Symb, - bool &Result) const { - validateSymbol(Symb); - const Elf_Sym *symb = getSymbol(Symb); - - Result = symb->getBinding() == ELF::STB_GLOBAL; - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::isSymbolWeak(DataRefImpl Symb, - bool &Result) const { - validateSymbol(Symb); - const Elf_Sym *symb = getSymbol(Symb); - - Result = symb->getBinding() == ELF::STB_WEAK; - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::isSymbolAbsolute(DataRefImpl Symb, bool &Res) const { - validateSymbol(Symb); - const Elf_Sym *symb = getSymbol(Symb); - Res = symb->st_shndx == ELF::SHN_ABS; - 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> - ::isSymbolInternal(DataRefImpl Symb, - bool &Result) const { - validateSymbol(Symb); - const Elf_Sym *symb = getSymbol(Symb); - - if ( symb->getType() == ELF::STT_FILE - || symb->getType() == ELF::STT_SECTION) - Result = true; - Result = false; - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const { - const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p); - sec += Header->e_shentsize; - Sec.p = reinterpret_cast<intptr_t>(sec); - Result = SectionRef(Sec, this); - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::getSectionName(DataRefImpl Sec, - StringRef &Result) const { - const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); - Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name)); - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::getSectionAddress(DataRefImpl Sec, - uint64_t &Result) const { - const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); - Result = sec->sh_addr; - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::getSectionSize(DataRefImpl Sec, - uint64_t &Result) const { - const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); - Result = sec->sh_size; - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::getSectionContents(DataRefImpl Sec, - StringRef &Result) const { - const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); - const char *start = (const char*)base() + sec->sh_offset; - Result = StringRef(start, sec->sh_size); - return object_error::success; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code ELFObjectFile<target_endianness, is64Bits> - ::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> - ::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; - memset(&RelData, 0, sizeof(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; + std::pair<unsigned char, unsigned char> + getElfArchType(MemoryBuffer *Object) { + if (Object->getBufferSize() < ELF::EI_NIDENT) + return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE); + return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS] + , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]); } - 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; - memset(&RelData, 0, sizeof(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(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; -} - -template<support::endianness target_endianness, bool is64Bits> -ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object - , error_code &ec) - : ObjectFile(Binary::isELF, Object, ec) - , isDyldELFObject(false) - , SectionHeaderTable(0) - , dot_shstrtab_sec(0) - , dot_strtab_sec(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; - for (uint64_t i = 0, e = getNumSections(); i != e; ++i) { - if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) { - if (SymbolTableSectionHeaderIndex) - // FIXME: Proper error handling. - report_fatal_error("More than one .symtab_shndx!"); - SymbolTableSectionHeaderIndex = sh; - } - if (sh->sh_type == ELF::SHT_SYMTAB) { - SymbolTableSectionsIndexMap[i] = SymbolTableSections.size(); - SymbolTableSections.push_back(sh); - } - if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) { - SectionRelocMap[getSection(sh->sh_info)].push_back(i); - } - ++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. - if (((const char*)base() + dot_shstrtab_sec->sh_offset) - [dot_shstrtab_sec->sh_size - 1] != 0) - // FIXME: Proper error handling. - report_fatal_error("String table must end with a null terminator!"); - } - - // Merge this into the above loop. - for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable), - *e = i + 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; - const char *dot_strtab = (const char*)base() + sh->sh_offset; - if (dot_strtab[sh->sh_size - 1] != 0) - // FIXME: Proper error handling. - report_fatal_error("String table must end with a null terminator!"); - } - } - } - - // 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; - memset(&SymbolData, 0, sizeof(SymbolData)); - if (SymbolTableSections.size() == 0) { - SymbolData.d.a = std::numeric_limits<uint32_t>::max(); - SymbolData.d.b = std::numeric_limits<uint32_t>::max(); - } else { - SymbolData.d.a = 1; // The 0th symbol in ELF is fake. - SymbolData.d.b = 0; - } - return symbol_iterator(SymbolRef(SymbolData, this)); -} - -template<support::endianness target_endianness, bool is64Bits> -symbol_iterator ELFObjectFile<target_endianness, is64Bits> - ::end_symbols() const { - DataRefImpl SymbolData; - memset(&SymbolData, 0, sizeof(SymbolData)); - SymbolData.d.a = std::numeric_limits<uint32_t>::max(); - SymbolData.d.b = std::numeric_limits<uint32_t>::max(); - return symbol_iterator(SymbolRef(SymbolData, this)); -} - -template<support::endianness target_endianness, bool is64Bits> -section_iterator ELFObjectFile<target_endianness, is64Bits> - ::begin_sections() const { - DataRefImpl ret; - memset(&ret, 0, sizeof(DataRefImpl)); - ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff); - return section_iterator(SectionRef(ret, this)); -} - -template<support::endianness target_endianness, bool is64Bits> -section_iterator ELFObjectFile<target_endianness, is64Bits> - ::end_sections() const { - DataRefImpl ret; - memset(&ret, 0, sizeof(DataRefImpl)); - ret.p = reinterpret_cast<intptr_t>(base() - + Header->e_shoff - + (Header->e_shentsize*getNumSections())); - return section_iterator(SectionRef(ret, this)); -} - -template<support::endianness target_endianness, bool is64Bits> -uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const { - return is64Bits ? 8 : 4; -} - -template<support::endianness target_endianness, bool is64Bits> -StringRef ELFObjectFile<target_endianness, is64Bits> - ::getFileFormatName() const { - switch(Header->e_ident[ELF::EI_CLASS]) { - case ELF::ELFCLASS32: - switch(Header->e_machine) { - case ELF::EM_386: - return "ELF32-i386"; - case ELF::EM_X86_64: - return "ELF32-x86-64"; - 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; -} +// Creates an in-memory object-file by default: createELFObjectFile(Buffer) +ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { + std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); + error_code ec; -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; + if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) + return new ELFObjectFile<support::little, false>(Object, ec); + else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) + return new ELFObjectFile<support::big, false>(Object, ec); + else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) + return new ELFObjectFile<support::big, true>(Object, ec); + else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { + ELFObjectFile<support::little, true> *result = + new ELFObjectFile<support::little, true>(Object, ec); + return result; } - 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)); + report_fatal_error("Buffer is not an ELF object file!"); } -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_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_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; - } - - // Use the default symbol table name section. - Result = getString(dot_strtab_sec, symb->st_name); - return object_error::success; -} - -// EI_CLASS, EI_DATA. -static std::pair<unsigned char, unsigned char> -getElfArchType(MemoryBuffer *Object) { - if (Object->getBufferSize() < ELF::EI_NIDENT) - return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE); - return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS] - , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]); -} - - -namespace { - template<support::endianness target_endianness, bool is64Bits> - class DyldELFObject : public ELFObjectFile<target_endianness, is64Bits> { - 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_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel; - typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela; - - typedef typename ELFObjectFile<target_endianness, is64Bits>:: - Elf_Ehdr Elf_Ehdr; - Elf_Ehdr *Header; - - // Update section headers according to the current location in memory - virtual void rebaseObject(std::vector<uint8_t*> *MemoryMap); - // Record memory addresses for cleanup - virtual void saveAddress(std::vector<uint8_t*> *MemoryMap, uint8_t *addr); - - protected: - virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const; - - public: - DyldELFObject(MemoryBuffer *Object, std::vector<uint8_t*> *MemoryMap, - error_code &ec); - - // Methods for type inquiry through isa, cast, and dyn_cast - static inline bool classof(const Binary *v) { - return (isa<ELFObjectFile<target_endianness, is64Bits> >(v) - && classof(cast<ELFObjectFile<target_endianness, is64Bits> >(v))); - } - static inline bool classof( - const ELFObjectFile<target_endianness, is64Bits> *v) { - return v->isDyldType(); - } - static inline bool classof(const DyldELFObject *v) { - return true; - } - }; -} // end anonymous namespace - -template<support::endianness target_endianness, bool is64Bits> -DyldELFObject<target_endianness, is64Bits>::DyldELFObject(MemoryBuffer *Object, - std::vector<uint8_t*> *MemoryMap, error_code &ec) - : ELFObjectFile<target_endianness, is64Bits>(Object, ec) - , Header(0) { - this->isDyldELFObject = true; - Header = const_cast<Elf_Ehdr *>( - reinterpret_cast<const Elf_Ehdr *>(this->base())); - if (Header->e_shoff == 0) - return; - - // Mark the image as a dynamic shared library - Header->e_type = ELF::ET_DYN; - - rebaseObject(MemoryMap); -} - -// Walk through the ELF headers, updating virtual addresses to reflect where -// the object is currently loaded in memory -template<support::endianness target_endianness, bool is64Bits> -void DyldELFObject<target_endianness, is64Bits>::rebaseObject( - std::vector<uint8_t*> *MemoryMap) { - typedef typename ELFDataTypeTypedefHelper< - target_endianness, is64Bits>::value_type addr_type; - - uint8_t *base_p = const_cast<uint8_t *>(this->base()); - Elf_Shdr *sectionTable = - reinterpret_cast<Elf_Shdr *>(base_p + Header->e_shoff); - uint64_t numSections = this->getNumSections(); - - // Allocate memory space for NOBITS sections (such as .bss), which only exist - // in memory, but don't occupy space in the object file. - // Update the address in the section headers to reflect this allocation. - for (uint64_t index = 0; index < numSections; index++) { - Elf_Shdr *sec = reinterpret_cast<Elf_Shdr *>( - reinterpret_cast<char *>(sectionTable) + index * Header->e_shentsize); - - // Only update sections that are meant to be present in program memory - if (sec->sh_flags & ELF::SHF_ALLOC) { - uint8_t *addr = base_p + sec->sh_offset; - if (sec->sh_type == ELF::SHT_NOBITS) { - addr = static_cast<uint8_t *>(calloc(sec->sh_size, 1)); - saveAddress(MemoryMap, addr); - } - else { - // FIXME: Currently memory with RWX permissions is allocated. In the - // future, make sure that permissions are as necessary - if (sec->sh_flags & ELF::SHF_WRITE) { - // see FIXME above - } - if (sec->sh_flags & ELF::SHF_EXECINSTR) { - // see FIXME above - } - } - assert(sizeof(addr_type) == sizeof(intptr_t) && - "Cross-architecture ELF dy-load is not supported!"); - sec->sh_addr = static_cast<addr_type>(intptr_t(addr)); - } - } - - // Now allocate actual space for COMMON symbols, which also don't occupy - // space in the object file. - // We want to allocate space for all COMMON symbols at once, so the flow is: - // 1. Go over all symbols, find those that are in COMMON. For each such - // symbol, record its size and the value field in its symbol header in a - // special vector. - // 2. Allocate memory for all COMMON symbols in one fell swoop. - // 3. Using the recorded information from (1), update the address fields in - // the symbol headers of the COMMON symbols to reflect their allocated - // address. - uint64_t TotalSize = 0; - std::vector<std::pair<Elf_Addr *, uint64_t> > SymbAddrInfo; - error_code ec = object_error::success; - for (symbol_iterator si = this->begin_symbols(), - se = this->end_symbols(); si != se; si.increment(ec)) { - uint64_t Size = 0; - ec = si->getSize(Size); - Elf_Sym* symb = const_cast<Elf_Sym*>( - this->getSymbol(si->getRawDataRefImpl())); - if (ec == object_error::success && - this->getSymbolTableIndex(symb) == ELF::SHN_COMMON && Size > 0) { - SymbAddrInfo.push_back(std::make_pair(&(symb->st_value), Size)); - TotalSize += Size; - } - } - - uint8_t* SectionPtr = (uint8_t *)calloc(TotalSize, 1); - saveAddress(MemoryMap, SectionPtr); - - typedef typename std::vector<std::pair<Elf_Addr *, uint64_t> >::iterator - AddrInfoIterator; - AddrInfoIterator EndIter = SymbAddrInfo.end(); - for (AddrInfoIterator AddrIter = SymbAddrInfo.begin(); - AddrIter != EndIter; ++AddrIter) { - assert(sizeof(addr_type) == sizeof(intptr_t) && - "Cross-architecture ELF dy-load is not supported!"); - *(AddrIter->first) = static_cast<addr_type>(intptr_t(SectionPtr)); - SectionPtr += AddrIter->second; - } -} - -// Record memory addresses for callers -template<support::endianness target_endianness, bool is64Bits> -void DyldELFObject<target_endianness, is64Bits>::saveAddress( - std::vector<uint8_t*> *MemoryMap, uint8_t* addr) { - if (MemoryMap) - MemoryMap->push_back(addr); - else - errs() << "WARNING: Memory leak - cannot record memory for ELF dyld."; -} - -template<support::endianness target_endianness, bool is64Bits> -error_code DyldELFObject<target_endianness, is64Bits>::getSymbolAddress( - DataRefImpl Symb, uint64_t &Result) const { - this->validateSymbol(Symb); - const Elf_Sym *symb = this->getSymbol(Symb); - if (this->getSymbolTableIndex(symb) == ELF::SHN_COMMON) { - Result = symb->st_value; - return object_error::success; - } - else { - return ELFObjectFile<target_endianness, is64Bits>::getSymbolAddress( - Symb, Result); - } -} - -namespace llvm { - - // Creates an in-memory object-file by default: createELFObjectFile(Buffer) - // Set doDyld to true to create a live (executable/debug-worthy) image - // If doDyld is true, any memory allocated for non-resident sections and - // symbols is recorded in MemoryMap. - ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object, - bool doDyld, std::vector<uint8_t *> *MemoryMap) { - std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); - error_code ec; - - if (doDyld) { - if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) - return new DyldELFObject<support::little, false>(Object, MemoryMap, ec); - else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) - return new DyldELFObject<support::big, false>(Object, MemoryMap, ec); - else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) - return new DyldELFObject<support::big, true>(Object, MemoryMap, ec); - else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { - DyldELFObject<support::little, true> *result = - new DyldELFObject<support::little, true>(Object, MemoryMap, ec); - - // Unit testing for type inquiry - assert(isa<Binary>(result) && "Type inquiry failed for ELF object!"); - assert((isa<DyldELFObject<support::little, true> >(result)) && - "Type inquiry failed for ELF object!"); - assert((isa<ELFObjectFile<support::little, true> >(result)) && - "Type inquiry failed for ELF object!"); - return result; - } - } - - if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) - return new ELFObjectFile<support::little, false>(Object, ec); - else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) - return new ELFObjectFile<support::big, false>(Object, ec); - else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) - return new ELFObjectFile<support::big, true>(Object, ec); - else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { - ELFObjectFile<support::little, true> *result = - new ELFObjectFile<support::little, true>(Object, ec); - - // Unit testing for type inquiry - assert(isa<Binary>(result) && "Type inquiry failed for ELF object!"); - assert((!isa<DyldELFObject<support::little, true> >(result)) && - "Type inquiry failed for ELF object!"); - assert((isa<ELFObjectFile<support::little, true> >(result)) && - "Type inquiry failed for ELF object!"); - return result; - } - - report_fatal_error("Buffer is not an ELF object file!"); - } - } // end namespace llvm |