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d1fc658396
With this we finally have an ELFFile that is O(1) to construct. This is helpful for programs like lld which have to do their own section walk. llvm-svn: 244510
523 lines
18 KiB
C++
523 lines
18 KiB
C++
//===- ELF.h - ELF object file implementation -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the ELFFile template class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_ELF_H
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#define LLVM_OBJECT_ELF_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Object/ELFTypes.h"
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#include "llvm/Support/MemoryBuffer.h"
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namespace llvm {
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namespace object {
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StringRef getELFRelocationTypeName(uint32_t Machine, uint32_t Type);
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// Subclasses of ELFFile may need this for template instantiation
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inline std::pair<unsigned char, unsigned char>
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getElfArchType(StringRef Object) {
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if (Object.size() < ELF::EI_NIDENT)
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return std::make_pair((uint8_t)ELF::ELFCLASSNONE,
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(uint8_t)ELF::ELFDATANONE);
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return std::make_pair((uint8_t)Object[ELF::EI_CLASS],
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(uint8_t)Object[ELF::EI_DATA]);
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}
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template <class ELFT>
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class ELFFile {
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public:
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LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
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typedef typename std::conditional<ELFT::Is64Bits,
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uint64_t, uint32_t>::type uintX_t;
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typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
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typedef Elf_Shdr_Impl<ELFT> Elf_Shdr;
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typedef Elf_Sym_Impl<ELFT> Elf_Sym;
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typedef Elf_Dyn_Impl<ELFT> Elf_Dyn;
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typedef Elf_Phdr_Impl<ELFT> Elf_Phdr;
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typedef Elf_Rel_Impl<ELFT, false> Elf_Rel;
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typedef Elf_Rel_Impl<ELFT, true> Elf_Rela;
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typedef Elf_Verdef_Impl<ELFT> Elf_Verdef;
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typedef Elf_Verdaux_Impl<ELFT> Elf_Verdaux;
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typedef Elf_Verneed_Impl<ELFT> Elf_Verneed;
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typedef Elf_Vernaux_Impl<ELFT> Elf_Vernaux;
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typedef Elf_Versym_Impl<ELFT> Elf_Versym;
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typedef Elf_Hash_Impl<ELFT> Elf_Hash;
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typedef iterator_range<const Elf_Dyn *> Elf_Dyn_Range;
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typedef iterator_range<const Elf_Shdr *> Elf_Shdr_Range;
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typedef iterator_range<const Elf_Sym *> Elf_Sym_Range;
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const uint8_t *base() const {
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return reinterpret_cast<const uint8_t *>(Buf.data());
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}
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private:
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StringRef Buf;
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const Elf_Ehdr *Header;
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const Elf_Shdr *SectionHeaderTable = nullptr;
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StringRef DotShstrtab; // Section header string table.
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public:
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template<typename T>
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const T *getEntry(uint32_t Section, uint32_t Entry) const;
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template <typename T>
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const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
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ErrorOr<StringRef> getStringTable(const Elf_Shdr *Section) const;
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ErrorOr<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const;
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ErrorOr<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section) const;
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void VerifyStrTab(const Elf_Shdr *sh) const;
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StringRef getRelocationTypeName(uint32_t Type) const;
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void getRelocationTypeName(uint32_t Type,
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SmallVectorImpl<char> &Result) const;
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/// \brief Get the symbol table section and symbol for a given relocation.
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template <class RelT>
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std::pair<const Elf_Shdr *, const Elf_Sym *>
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getRelocationSymbol(const Elf_Shdr *RelSec, const RelT *Rel) const;
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ELFFile(StringRef Object, std::error_code &EC);
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bool isMipsELF64() const {
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return Header->e_machine == ELF::EM_MIPS &&
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Header->getFileClass() == ELF::ELFCLASS64;
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}
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bool isMips64EL() const {
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return Header->e_machine == ELF::EM_MIPS &&
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Header->getFileClass() == ELF::ELFCLASS64 &&
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Header->getDataEncoding() == ELF::ELFDATA2LSB;
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}
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ErrorOr<const Elf_Dyn *> dynamic_table_begin(const Elf_Phdr *Phdr) const;
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ErrorOr<const Elf_Dyn *> dynamic_table_end(const Elf_Phdr *Phdr) const;
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ErrorOr<Elf_Dyn_Range> dynamic_table(const Elf_Phdr *Phdr) const {
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ErrorOr<const Elf_Dyn *> Begin = dynamic_table_begin(Phdr);
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if (std::error_code EC = Begin.getError())
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return EC;
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ErrorOr<const Elf_Dyn *> End = dynamic_table_end(Phdr);
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if (std::error_code EC = End.getError())
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return EC;
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return make_range(*Begin, *End);
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}
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const Elf_Shdr *section_begin() const;
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const Elf_Shdr *section_end() const;
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Elf_Shdr_Range sections() const {
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return make_range(section_begin(), section_end());
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}
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const Elf_Sym *symbol_begin(const Elf_Shdr *Sec) const {
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if (!Sec)
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return nullptr;
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if (Sec->sh_entsize != sizeof(Elf_Sym))
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report_fatal_error("Invalid symbol size");
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return reinterpret_cast<const Elf_Sym *>(base() + Sec->sh_offset);
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}
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const Elf_Sym *symbol_end(const Elf_Shdr *Sec) const {
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if (!Sec)
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return nullptr;
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uint64_t Size = Sec->sh_size;
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if (Size % sizeof(Elf_Sym))
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report_fatal_error("Invalid symbol table size");
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return symbol_begin(Sec) + Size / sizeof(Elf_Sym);
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}
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Elf_Sym_Range symbols(const Elf_Shdr *Sec) const {
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return make_range(symbol_begin(Sec), symbol_end(Sec));
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}
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typedef iterator_range<const Elf_Rela *> Elf_Rela_Range;
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const Elf_Rela *rela_begin(const Elf_Shdr *sec) const {
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if (sec->sh_entsize != sizeof(Elf_Rela))
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report_fatal_error("Invalid relocation entry size");
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return reinterpret_cast<const Elf_Rela *>(base() + sec->sh_offset);
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}
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const Elf_Rela *rela_end(const Elf_Shdr *sec) const {
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uint64_t Size = sec->sh_size;
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if (Size % sizeof(Elf_Rela))
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report_fatal_error("Invalid relocation table size");
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return rela_begin(sec) + Size / sizeof(Elf_Rela);
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}
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Elf_Rela_Range relas(const Elf_Shdr *Sec) const {
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return make_range(rela_begin(Sec), rela_end(Sec));
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}
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const Elf_Rel *rel_begin(const Elf_Shdr *sec) const {
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if (sec->sh_entsize != sizeof(Elf_Rel))
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report_fatal_error("Invalid relocation entry size");
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return reinterpret_cast<const Elf_Rel *>(base() + sec->sh_offset);
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}
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const Elf_Rel *rel_end(const Elf_Shdr *sec) const {
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uint64_t Size = sec->sh_size;
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if (Size % sizeof(Elf_Rel))
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report_fatal_error("Invalid relocation table size");
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return rel_begin(sec) + Size / sizeof(Elf_Rel);
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}
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typedef iterator_range<const Elf_Rel *> Elf_Rel_Range;
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Elf_Rel_Range rels(const Elf_Shdr *Sec) const {
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return make_range(rel_begin(Sec), rel_end(Sec));
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}
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/// \brief Iterate over program header table.
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const Elf_Phdr *program_header_begin() const {
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if (Header->e_phnum && Header->e_phentsize != sizeof(Elf_Phdr))
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report_fatal_error("Invalid program header size");
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return reinterpret_cast<const Elf_Phdr *>(base() + Header->e_phoff);
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}
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const Elf_Phdr *program_header_end() const {
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return program_header_begin() + Header->e_phnum;
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}
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typedef iterator_range<const Elf_Phdr *> Elf_Phdr_Range;
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const Elf_Phdr_Range program_headers() const {
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return make_range(program_header_begin(), program_header_end());
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}
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uint64_t getNumSections() const;
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uintX_t getStringTableIndex() const;
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ELF::Elf64_Word
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getExtendedSymbolTableIndex(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
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ArrayRef<Elf_Word> ShndxTable) const;
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const Elf_Ehdr *getHeader() const { return Header; }
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ErrorOr<const Elf_Shdr *> getSection(const Elf_Sym *Sym,
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const Elf_Shdr *SymTab,
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ArrayRef<Elf_Word> ShndxTable) const;
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ErrorOr<const Elf_Shdr *> getSection(uint32_t Index) const;
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const Elf_Sym *getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
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return &*(symbol_begin(Sec) + Index);
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}
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ErrorOr<StringRef> getSectionName(const Elf_Shdr *Section) const;
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ErrorOr<ArrayRef<uint8_t> > getSectionContents(const Elf_Shdr *Sec) const;
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};
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typedef ELFFile<ELFType<support::little, false>> ELF32LEFile;
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typedef ELFFile<ELFType<support::little, true>> ELF64LEFile;
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typedef ELFFile<ELFType<support::big, false>> ELF32BEFile;
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typedef ELFFile<ELFType<support::big, true>> ELF64BEFile;
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template <class ELFT>
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ELF::Elf64_Word ELFFile<ELFT>::getExtendedSymbolTableIndex(
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const Elf_Sym *Sym, const Elf_Shdr *SymTab,
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ArrayRef<Elf_Word> ShndxTable) const {
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assert(Sym->st_shndx == ELF::SHN_XINDEX);
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unsigned Index = Sym - symbol_begin(SymTab);
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// FIXME: error checking
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return ShndxTable[Index];
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}
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template <class ELFT>
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ErrorOr<const typename ELFFile<ELFT>::Elf_Shdr *>
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ELFFile<ELFT>::getSection(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
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ArrayRef<Elf_Word> ShndxTable) const {
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uint32_t Index = Sym->st_shndx;
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if (Index == ELF::SHN_XINDEX)
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return getSection(getExtendedSymbolTableIndex(Sym, SymTab, ShndxTable));
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if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
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return nullptr;
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return getSection(Sym->st_shndx);
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}
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template <class ELFT>
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ErrorOr<ArrayRef<uint8_t> >
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ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
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if (Sec->sh_offset + Sec->sh_size > Buf.size())
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return object_error::parse_failed;
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const uint8_t *Start = base() + Sec->sh_offset;
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return makeArrayRef(Start, Sec->sh_size);
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}
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template <class ELFT>
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StringRef ELFFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
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return getELFRelocationTypeName(Header->e_machine, Type);
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}
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template <class ELFT>
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void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type,
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SmallVectorImpl<char> &Result) const {
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if (!isMipsELF64()) {
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StringRef Name = getRelocationTypeName(Type);
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Result.append(Name.begin(), Name.end());
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} else {
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// The Mips N64 ABI allows up to three operations to be specified per
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// relocation record. Unfortunately there's no easy way to test for the
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// presence of N64 ELFs as they have no special flag that identifies them
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// as being N64. We can safely assume at the moment that all Mips
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// ELFCLASS64 ELFs are N64. New Mips64 ABIs should provide enough
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// information to disambiguate between old vs new ABIs.
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uint8_t Type1 = (Type >> 0) & 0xFF;
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uint8_t Type2 = (Type >> 8) & 0xFF;
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uint8_t Type3 = (Type >> 16) & 0xFF;
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// Concat all three relocation type names.
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StringRef Name = getRelocationTypeName(Type1);
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Result.append(Name.begin(), Name.end());
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Name = getRelocationTypeName(Type2);
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Result.append(1, '/');
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Result.append(Name.begin(), Name.end());
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Name = getRelocationTypeName(Type3);
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Result.append(1, '/');
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Result.append(Name.begin(), Name.end());
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}
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}
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template <class ELFT>
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template <class RelT>
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std::pair<const typename ELFFile<ELFT>::Elf_Shdr *,
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const typename ELFFile<ELFT>::Elf_Sym *>
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ELFFile<ELFT>::getRelocationSymbol(const Elf_Shdr *Sec, const RelT *Rel) const {
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if (!Sec->sh_link)
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return std::make_pair(nullptr, nullptr);
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ErrorOr<const Elf_Shdr *> SymTableOrErr = getSection(Sec->sh_link);
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if (std::error_code EC = SymTableOrErr.getError())
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report_fatal_error(EC.message());
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const Elf_Shdr *SymTable = *SymTableOrErr;
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return std::make_pair(
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SymTable, getEntry<Elf_Sym>(SymTable, Rel->getSymbol(isMips64EL())));
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}
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template <class ELFT>
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uint64_t ELFFile<ELFT>::getNumSections() const {
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assert(Header && "Header not initialized!");
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if (Header->e_shnum == ELF::SHN_UNDEF && Header->e_shoff > 0) {
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assert(SectionHeaderTable && "SectionHeaderTable not initialized!");
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return SectionHeaderTable->sh_size;
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}
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return Header->e_shnum;
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}
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template <class ELFT>
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typename ELFFile<ELFT>::uintX_t ELFFile<ELFT>::getStringTableIndex() const {
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if (Header->e_shnum == ELF::SHN_UNDEF) {
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if (Header->e_shstrndx == ELF::SHN_HIRESERVE)
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return SectionHeaderTable->sh_link;
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if (Header->e_shstrndx >= getNumSections())
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return 0;
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}
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return Header->e_shstrndx;
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}
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template <class ELFT>
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ELFFile<ELFT>::ELFFile(StringRef Object, std::error_code &EC)
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: Buf(Object) {
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const uint64_t FileSize = Buf.size();
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if (sizeof(Elf_Ehdr) > FileSize) {
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// File too short!
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EC = object_error::parse_failed;
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return;
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}
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Header = reinterpret_cast<const Elf_Ehdr *>(base());
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if (Header->e_shoff == 0)
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return;
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const uint64_t SectionTableOffset = Header->e_shoff;
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if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize) {
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// Section header table goes past end of file!
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EC = object_error::parse_failed;
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return;
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}
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// The getNumSections() call below depends on SectionHeaderTable being set.
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SectionHeaderTable =
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reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset);
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const uint64_t SectionTableSize = getNumSections() * Header->e_shentsize;
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if (SectionTableOffset + SectionTableSize > FileSize) {
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// Section table goes past end of file!
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EC = object_error::parse_failed;
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return;
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}
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// Get string table sections.
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uintX_t StringTableIndex = getStringTableIndex();
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if (StringTableIndex) {
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ErrorOr<const Elf_Shdr *> StrTabSecOrErr = getSection(StringTableIndex);
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if ((EC = StrTabSecOrErr.getError()))
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return;
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ErrorOr<StringRef> StringTableOrErr = getStringTable(*StrTabSecOrErr);
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if ((EC = StringTableOrErr.getError()))
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return;
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DotShstrtab = *StringTableOrErr;
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}
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EC = std::error_code();
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}
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template <class ELFT>
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static bool compareAddr(uint64_t VAddr, const Elf_Phdr_Impl<ELFT> *Phdr) {
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return VAddr < Phdr->p_vaddr;
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}
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template <class ELFT>
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const typename ELFFile<ELFT>::Elf_Shdr *ELFFile<ELFT>::section_begin() const {
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if (Header->e_shentsize != sizeof(Elf_Shdr))
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report_fatal_error(
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"Invalid section header entry size (e_shentsize) in ELF header");
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return reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
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}
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template <class ELFT>
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const typename ELFFile<ELFT>::Elf_Shdr *ELFFile<ELFT>::section_end() const {
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return section_begin() + getNumSections();
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}
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template <class ELFT>
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ErrorOr<const typename ELFFile<ELFT>::Elf_Dyn *>
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ELFFile<ELFT>::dynamic_table_begin(const Elf_Phdr *Phdr) const {
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if (!Phdr)
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return nullptr;
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assert(Phdr->p_type == ELF::PT_DYNAMIC && "Got the wrong program header");
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uintX_t Offset = Phdr->p_offset;
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if (Offset > Buf.size())
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return object_error::parse_failed;
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return reinterpret_cast<const Elf_Dyn *>(base() + Offset);
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}
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template <class ELFT>
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ErrorOr<const typename ELFFile<ELFT>::Elf_Dyn *>
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ELFFile<ELFT>::dynamic_table_end(const Elf_Phdr *Phdr) const {
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if (!Phdr)
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return nullptr;
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assert(Phdr->p_type == ELF::PT_DYNAMIC && "Got the wrong program header");
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uintX_t Size = Phdr->p_filesz;
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if (Size % sizeof(Elf_Dyn))
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return object_error::elf_invalid_dynamic_table_size;
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// FIKME: Check for overflow?
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uintX_t End = Phdr->p_offset + Size;
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if (End > Buf.size())
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return object_error::parse_failed;
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return reinterpret_cast<const Elf_Dyn *>(base() + End);
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}
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template <class ELFT>
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template <typename T>
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const T *ELFFile<ELFT>::getEntry(uint32_t Section, uint32_t Entry) const {
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ErrorOr<const Elf_Shdr *> Sec = getSection(Section);
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if (std::error_code EC = Sec.getError())
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report_fatal_error(EC.message());
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return getEntry<T>(*Sec, Entry);
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}
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template <class ELFT>
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template <typename T>
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const T *ELFFile<ELFT>::getEntry(const Elf_Shdr *Section,
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uint32_t Entry) const {
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return reinterpret_cast<const T *>(base() + Section->sh_offset +
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(Entry * Section->sh_entsize));
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}
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template <class ELFT>
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ErrorOr<const typename ELFFile<ELFT>::Elf_Shdr *>
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ELFFile<ELFT>::getSection(uint32_t Index) const {
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assert(SectionHeaderTable && "SectionHeaderTable not initialized!");
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|
if (Index >= getNumSections())
|
|
return object_error::invalid_section_index;
|
|
|
|
return reinterpret_cast<const Elf_Shdr *>(
|
|
reinterpret_cast<const char *>(SectionHeaderTable) +
|
|
(Index * Header->e_shentsize));
|
|
}
|
|
|
|
template <class ELFT>
|
|
ErrorOr<StringRef>
|
|
ELFFile<ELFT>::getStringTable(const Elf_Shdr *Section) const {
|
|
if (Section->sh_type != ELF::SHT_STRTAB)
|
|
return object_error::parse_failed;
|
|
uint64_t Offset = Section->sh_offset;
|
|
uint64_t Size = Section->sh_size;
|
|
if (Offset + Size > Buf.size())
|
|
return object_error::parse_failed;
|
|
StringRef Data((const char *)base() + Section->sh_offset, Size);
|
|
if (Data[Size - 1] != '\0')
|
|
return object_error::string_table_non_null_end;
|
|
return Data;
|
|
}
|
|
|
|
template <class ELFT>
|
|
ErrorOr<ArrayRef<typename ELFFile<ELFT>::Elf_Word>>
|
|
ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const {
|
|
assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX);
|
|
const Elf_Word *ShndxTableBegin =
|
|
reinterpret_cast<const Elf_Word *>(base() + Section.sh_offset);
|
|
uintX_t Size = Section.sh_offset;
|
|
if (Size % sizeof(uintX_t))
|
|
return object_error::parse_failed;
|
|
const Elf_Word *ShndxTableEnd = ShndxTableBegin + Size / sizeof(uintX_t);
|
|
if (reinterpret_cast<const char *>(ShndxTableEnd) > Buf.end())
|
|
return object_error::parse_failed;
|
|
return ArrayRef<Elf_Word>(ShndxTableBegin, ShndxTableEnd);
|
|
}
|
|
|
|
template <class ELFT>
|
|
ErrorOr<StringRef>
|
|
ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const {
|
|
if (Sec.sh_type != ELF::SHT_SYMTAB && Sec.sh_type != ELF::SHT_DYNSYM)
|
|
return object_error::parse_failed;
|
|
ErrorOr<const Elf_Shdr *> SectionOrErr = getSection(Sec.sh_link);
|
|
if (std::error_code EC = SectionOrErr.getError())
|
|
return EC;
|
|
return getStringTable(*SectionOrErr);
|
|
}
|
|
|
|
template <class ELFT>
|
|
ErrorOr<StringRef>
|
|
ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
|
|
uint32_t Offset = Section->sh_name;
|
|
if (Offset == 0)
|
|
return StringRef();
|
|
if (Offset >= DotShstrtab.size())
|
|
return object_error::parse_failed;
|
|
return StringRef(DotShstrtab.data() + Offset);
|
|
}
|
|
|
|
/// This function returns the hash value for a symbol in the .dynsym section
|
|
/// Name of the API remains consistent as specified in the libelf
|
|
/// REF : http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#hash
|
|
static inline unsigned elf_hash(StringRef &symbolName) {
|
|
unsigned h = 0, g;
|
|
for (unsigned i = 0, j = symbolName.size(); i < j; i++) {
|
|
h = (h << 4) + symbolName[i];
|
|
g = h & 0xf0000000L;
|
|
if (g != 0)
|
|
h ^= g >> 24;
|
|
h &= ~g;
|
|
}
|
|
return h;
|
|
}
|
|
} // end namespace object
|
|
} // end namespace llvm
|
|
|
|
#endif
|