mirror of
https://github.com/RPCS3/llvm-mirror.git
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8d4f850499
Summary: Currently, `llvm-objdump` prints "unknown" instead of d_tag value in hex format. Because getDynamicTagAsString returns "unknown" rather than empty string. Reviewers: grimar, jhenderson Reviewed By: jhenderson Subscribers: rupprecht, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D58763 llvm-svn: 355262
650 lines
22 KiB
C++
650 lines
22 KiB
C++
//===- ELF.h - ELF object file implementation -------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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/ArrayRef.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Object/ELFTypes.h"
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#include "llvm/Object/Error.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <limits>
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#include <utility>
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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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uint32_t getELFRelativeRelocationType(uint32_t Machine);
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StringRef getELFSectionTypeName(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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static inline Error createError(StringRef Err) {
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return make_error<StringError>(Err, object_error::parse_failed);
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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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using uintX_t = typename ELFT::uint;
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using Elf_Ehdr = typename ELFT::Ehdr;
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using Elf_Shdr = typename ELFT::Shdr;
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using Elf_Sym = typename ELFT::Sym;
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using Elf_Dyn = typename ELFT::Dyn;
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using Elf_Phdr = typename ELFT::Phdr;
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using Elf_Rel = typename ELFT::Rel;
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using Elf_Rela = typename ELFT::Rela;
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using Elf_Relr = typename ELFT::Relr;
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using Elf_Verdef = typename ELFT::Verdef;
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using Elf_Verdaux = typename ELFT::Verdaux;
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using Elf_Verneed = typename ELFT::Verneed;
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using Elf_Vernaux = typename ELFT::Vernaux;
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using Elf_Versym = typename ELFT::Versym;
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using Elf_Hash = typename ELFT::Hash;
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using Elf_GnuHash = typename ELFT::GnuHash;
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using Elf_Nhdr = typename ELFT::Nhdr;
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using Elf_Note = typename ELFT::Note;
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using Elf_Note_Iterator = typename ELFT::NoteIterator;
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using Elf_Dyn_Range = typename ELFT::DynRange;
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using Elf_Shdr_Range = typename ELFT::ShdrRange;
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using Elf_Sym_Range = typename ELFT::SymRange;
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using Elf_Rel_Range = typename ELFT::RelRange;
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using Elf_Rela_Range = typename ELFT::RelaRange;
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using Elf_Relr_Range = typename ELFT::RelrRange;
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using Elf_Phdr_Range = typename ELFT::PhdrRange;
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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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size_t getBufSize() const { return Buf.size(); }
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private:
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StringRef Buf;
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ELFFile(StringRef Object);
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public:
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const Elf_Ehdr *getHeader() const {
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return reinterpret_cast<const Elf_Ehdr *>(base());
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}
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template <typename T>
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Expected<const T *> getEntry(uint32_t Section, uint32_t Entry) const;
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template <typename T>
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Expected<const T *> getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
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Expected<StringRef> getStringTable(const Elf_Shdr *Section) const;
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Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const;
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Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section,
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Elf_Shdr_Range Sections) const;
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Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section) const;
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Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section,
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Elf_Shdr_Range Sections) 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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uint32_t getRelativeRelocationType() const;
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std::string getDynamicTagAsString(unsigned Arch, uint64_t Type) const;
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std::string getDynamicTagAsString(uint64_t Type) const;
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/// Get the symbol for a given relocation.
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Expected<const Elf_Sym *> getRelocationSymbol(const Elf_Rel *Rel,
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const Elf_Shdr *SymTab) const;
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static Expected<ELFFile> create(StringRef Object);
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bool isMipsELF64() const {
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return getHeader()->e_machine == ELF::EM_MIPS &&
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getHeader()->getFileClass() == ELF::ELFCLASS64;
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}
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bool isMips64EL() const {
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return isMipsELF64() &&
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getHeader()->getDataEncoding() == ELF::ELFDATA2LSB;
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}
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Expected<Elf_Shdr_Range> sections() const;
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Expected<Elf_Dyn_Range> dynamicEntries() const;
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Expected<const uint8_t *> toMappedAddr(uint64_t VAddr) const;
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Expected<Elf_Sym_Range> symbols(const Elf_Shdr *Sec) const {
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if (!Sec)
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return makeArrayRef<Elf_Sym>(nullptr, nullptr);
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return getSectionContentsAsArray<Elf_Sym>(Sec);
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}
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Expected<Elf_Rela_Range> relas(const Elf_Shdr *Sec) const {
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return getSectionContentsAsArray<Elf_Rela>(Sec);
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}
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Expected<Elf_Rel_Range> rels(const Elf_Shdr *Sec) const {
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return getSectionContentsAsArray<Elf_Rel>(Sec);
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}
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Expected<Elf_Relr_Range> relrs(const Elf_Shdr *Sec) const {
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return getSectionContentsAsArray<Elf_Relr>(Sec);
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}
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Expected<std::vector<Elf_Rela>> decode_relrs(Elf_Relr_Range relrs) const;
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Expected<std::vector<Elf_Rela>> android_relas(const Elf_Shdr *Sec) const;
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/// Iterate over program header table.
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Expected<Elf_Phdr_Range> program_headers() const {
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if (getHeader()->e_phnum && getHeader()->e_phentsize != sizeof(Elf_Phdr))
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return createError("invalid e_phentsize");
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if (getHeader()->e_phoff +
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(getHeader()->e_phnum * getHeader()->e_phentsize) >
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getBufSize())
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return createError("program headers longer than binary");
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auto *Begin =
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reinterpret_cast<const Elf_Phdr *>(base() + getHeader()->e_phoff);
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return makeArrayRef(Begin, Begin + getHeader()->e_phnum);
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}
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/// Get an iterator over notes in a program header.
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///
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/// The program header must be of type \c PT_NOTE.
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///
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/// \param Phdr the program header to iterate over.
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/// \param Err [out] an error to support fallible iteration, which should
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/// be checked after iteration ends.
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Elf_Note_Iterator notes_begin(const Elf_Phdr &Phdr, Error &Err) const {
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if (Phdr.p_type != ELF::PT_NOTE) {
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Err = createError("attempt to iterate notes of non-note program header");
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return Elf_Note_Iterator(Err);
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}
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if (Phdr.p_offset + Phdr.p_filesz > getBufSize()) {
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Err = createError("invalid program header offset/size");
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return Elf_Note_Iterator(Err);
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}
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return Elf_Note_Iterator(base() + Phdr.p_offset, Phdr.p_filesz, Err);
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}
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/// Get an iterator over notes in a section.
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///
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/// The section must be of type \c SHT_NOTE.
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///
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/// \param Shdr the section to iterate over.
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/// \param Err [out] an error to support fallible iteration, which should
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/// be checked after iteration ends.
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Elf_Note_Iterator notes_begin(const Elf_Shdr &Shdr, Error &Err) const {
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if (Shdr.sh_type != ELF::SHT_NOTE) {
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Err = createError("attempt to iterate notes of non-note section");
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return Elf_Note_Iterator(Err);
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}
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if (Shdr.sh_offset + Shdr.sh_size > getBufSize()) {
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Err = createError("invalid section offset/size");
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return Elf_Note_Iterator(Err);
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}
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return Elf_Note_Iterator(base() + Shdr.sh_offset, Shdr.sh_size, Err);
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}
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/// Get the end iterator for notes.
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Elf_Note_Iterator notes_end() const {
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return Elf_Note_Iterator();
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}
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/// Get an iterator range over notes of a program header.
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///
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/// The program header must be of type \c PT_NOTE.
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///
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/// \param Phdr the program header to iterate over.
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/// \param Err [out] an error to support fallible iteration, which should
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/// be checked after iteration ends.
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iterator_range<Elf_Note_Iterator> notes(const Elf_Phdr &Phdr,
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Error &Err) const {
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return make_range(notes_begin(Phdr, Err), notes_end());
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}
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/// Get an iterator range over notes of a section.
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///
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/// The section must be of type \c SHT_NOTE.
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///
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/// \param Shdr the section to iterate over.
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/// \param Err [out] an error to support fallible iteration, which should
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/// be checked after iteration ends.
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iterator_range<Elf_Note_Iterator> notes(const Elf_Shdr &Shdr,
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Error &Err) const {
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return make_range(notes_begin(Shdr, Err), notes_end());
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}
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Expected<StringRef> getSectionStringTable(Elf_Shdr_Range Sections) const;
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Expected<uint32_t> getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms,
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ArrayRef<Elf_Word> ShndxTable) const;
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Expected<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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Expected<const Elf_Shdr *> getSection(const Elf_Sym *Sym,
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Elf_Sym_Range Symtab,
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ArrayRef<Elf_Word> ShndxTable) const;
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Expected<const Elf_Shdr *> getSection(uint32_t Index) const;
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Expected<const Elf_Shdr *> getSection(const StringRef SectionName) const;
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Expected<const Elf_Sym *> getSymbol(const Elf_Shdr *Sec,
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uint32_t Index) const;
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Expected<StringRef> getSectionName(const Elf_Shdr *Section) const;
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Expected<StringRef> getSectionName(const Elf_Shdr *Section,
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StringRef DotShstrtab) const;
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template <typename T>
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Expected<ArrayRef<T>> getSectionContentsAsArray(const Elf_Shdr *Sec) const;
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Expected<ArrayRef<uint8_t>> getSectionContents(const Elf_Shdr *Sec) const;
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};
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using ELF32LEFile = ELFFile<ELF32LE>;
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using ELF64LEFile = ELFFile<ELF64LE>;
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using ELF32BEFile = ELFFile<ELF32BE>;
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using ELF64BEFile = ELFFile<ELF64BE>;
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template <class ELFT>
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inline Expected<const typename ELFT::Shdr *>
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getSection(typename ELFT::ShdrRange Sections, uint32_t Index) {
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if (Index >= Sections.size())
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return createError("invalid section index");
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return &Sections[Index];
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}
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template <class ELFT>
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inline Expected<uint32_t>
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getExtendedSymbolTableIndex(const typename ELFT::Sym *Sym,
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const typename ELFT::Sym *FirstSym,
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ArrayRef<typename ELFT::Word> ShndxTable) {
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assert(Sym->st_shndx == ELF::SHN_XINDEX);
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unsigned Index = Sym - FirstSym;
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if (Index >= ShndxTable.size())
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return createError("index past the end of the symbol table");
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// The size of the table was checked in getSHNDXTable.
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return ShndxTable[Index];
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}
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template <class ELFT>
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Expected<uint32_t>
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ELFFile<ELFT>::getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms,
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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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auto ErrorOrIndex = getExtendedSymbolTableIndex<ELFT>(
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Sym, Syms.begin(), ShndxTable);
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if (!ErrorOrIndex)
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return ErrorOrIndex.takeError();
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return *ErrorOrIndex;
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}
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if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
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return 0;
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return Index;
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}
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template <class ELFT>
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Expected<const typename ELFT::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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auto SymsOrErr = symbols(SymTab);
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if (!SymsOrErr)
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return SymsOrErr.takeError();
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return getSection(Sym, *SymsOrErr, ShndxTable);
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}
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template <class ELFT>
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Expected<const typename ELFT::Shdr *>
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ELFFile<ELFT>::getSection(const Elf_Sym *Sym, Elf_Sym_Range Symbols,
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ArrayRef<Elf_Word> ShndxTable) const {
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auto IndexOrErr = getSectionIndex(Sym, Symbols, ShndxTable);
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if (!IndexOrErr)
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return IndexOrErr.takeError();
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uint32_t Index = *IndexOrErr;
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if (Index == 0)
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return nullptr;
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return getSection(Index);
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}
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template <class ELFT>
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inline Expected<const typename ELFT::Sym *>
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getSymbol(typename ELFT::SymRange Symbols, uint32_t Index) {
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if (Index >= Symbols.size())
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return createError("invalid symbol index");
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return &Symbols[Index];
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}
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template <class ELFT>
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Expected<const typename ELFT::Sym *>
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ELFFile<ELFT>::getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
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auto SymtabOrErr = symbols(Sec);
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if (!SymtabOrErr)
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return SymtabOrErr.takeError();
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return object::getSymbol<ELFT>(*SymtabOrErr, Index);
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}
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template <class ELFT>
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template <typename T>
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Expected<ArrayRef<T>>
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ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr *Sec) const {
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if (Sec->sh_entsize != sizeof(T) && sizeof(T) != 1)
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return createError("invalid sh_entsize");
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uintX_t Offset = Sec->sh_offset;
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uintX_t Size = Sec->sh_size;
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if (Size % sizeof(T))
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return createError("size is not a multiple of sh_entsize");
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if ((std::numeric_limits<uintX_t>::max() - Offset < Size) ||
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Offset + Size > Buf.size())
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return createError("invalid section offset");
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if (Offset % alignof(T))
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return createError("unaligned data");
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const T *Start = reinterpret_cast<const T *>(base() + Offset);
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return makeArrayRef(Start, Size / sizeof(T));
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}
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template <class ELFT>
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Expected<ArrayRef<uint8_t>>
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ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
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return getSectionContentsAsArray<uint8_t>(Sec);
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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(getHeader()->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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uint32_t ELFFile<ELFT>::getRelativeRelocationType() const {
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return getELFRelativeRelocationType(getHeader()->e_machine);
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}
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template <class ELFT>
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Expected<const typename ELFT::Sym *>
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ELFFile<ELFT>::getRelocationSymbol(const Elf_Rel *Rel,
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const Elf_Shdr *SymTab) const {
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uint32_t Index = Rel->getSymbol(isMips64EL());
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if (Index == 0)
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return nullptr;
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return getEntry<Elf_Sym>(SymTab, Index);
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}
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template <class ELFT>
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Expected<StringRef>
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ELFFile<ELFT>::getSectionStringTable(Elf_Shdr_Range Sections) const {
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uint32_t Index = getHeader()->e_shstrndx;
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if (Index == ELF::SHN_XINDEX)
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Index = Sections[0].sh_link;
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if (!Index) // no section string table.
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return "";
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if (Index >= Sections.size())
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return createError("invalid section index");
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return getStringTable(&Sections[Index]);
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}
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template <class ELFT> ELFFile<ELFT>::ELFFile(StringRef Object) : Buf(Object) {}
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template <class ELFT>
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Expected<ELFFile<ELFT>> ELFFile<ELFT>::create(StringRef Object) {
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if (sizeof(Elf_Ehdr) > Object.size())
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return createError("Invalid buffer");
|
|
return ELFFile(Object);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<typename ELFT::ShdrRange> ELFFile<ELFT>::sections() const {
|
|
const uintX_t SectionTableOffset = getHeader()->e_shoff;
|
|
if (SectionTableOffset == 0)
|
|
return ArrayRef<Elf_Shdr>();
|
|
|
|
if (getHeader()->e_shentsize != sizeof(Elf_Shdr))
|
|
return createError(
|
|
"invalid section header entry size (e_shentsize) in ELF header");
|
|
|
|
const uint64_t FileSize = Buf.size();
|
|
|
|
if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize)
|
|
return createError("section header table goes past the end of the file");
|
|
|
|
// Invalid address alignment of section headers
|
|
if (SectionTableOffset & (alignof(Elf_Shdr) - 1))
|
|
return createError("invalid alignment of section headers");
|
|
|
|
const Elf_Shdr *First =
|
|
reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset);
|
|
|
|
uintX_t NumSections = getHeader()->e_shnum;
|
|
if (NumSections == 0)
|
|
NumSections = First->sh_size;
|
|
|
|
if (NumSections > UINT64_MAX / sizeof(Elf_Shdr))
|
|
return createError("section table goes past the end of file");
|
|
|
|
const uint64_t SectionTableSize = NumSections * sizeof(Elf_Shdr);
|
|
|
|
// Section table goes past end of file!
|
|
if (SectionTableOffset + SectionTableSize > FileSize)
|
|
return createError("section table goes past the end of file");
|
|
|
|
return makeArrayRef(First, NumSections);
|
|
}
|
|
|
|
template <class ELFT>
|
|
template <typename T>
|
|
Expected<const T *> ELFFile<ELFT>::getEntry(uint32_t Section,
|
|
uint32_t Entry) const {
|
|
auto SecOrErr = getSection(Section);
|
|
if (!SecOrErr)
|
|
return SecOrErr.takeError();
|
|
return getEntry<T>(*SecOrErr, Entry);
|
|
}
|
|
|
|
template <class ELFT>
|
|
template <typename T>
|
|
Expected<const T *> ELFFile<ELFT>::getEntry(const Elf_Shdr *Section,
|
|
uint32_t Entry) const {
|
|
if (sizeof(T) != Section->sh_entsize)
|
|
return createError("invalid sh_entsize");
|
|
size_t Pos = Section->sh_offset + Entry * sizeof(T);
|
|
if (Pos + sizeof(T) > Buf.size())
|
|
return createError("invalid section offset");
|
|
return reinterpret_cast<const T *>(base() + Pos);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<const typename ELFT::Shdr *>
|
|
ELFFile<ELFT>::getSection(uint32_t Index) const {
|
|
auto TableOrErr = sections();
|
|
if (!TableOrErr)
|
|
return TableOrErr.takeError();
|
|
return object::getSection<ELFT>(*TableOrErr, Index);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<const typename ELFT::Shdr *>
|
|
ELFFile<ELFT>::getSection(const StringRef SectionName) const {
|
|
auto TableOrErr = sections();
|
|
if (!TableOrErr)
|
|
return TableOrErr.takeError();
|
|
for (auto &Sec : *TableOrErr) {
|
|
auto SecNameOrErr = getSectionName(&Sec);
|
|
if (!SecNameOrErr)
|
|
return SecNameOrErr.takeError();
|
|
if (*SecNameOrErr == SectionName)
|
|
return &Sec;
|
|
}
|
|
return createError("invalid section name");
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<StringRef>
|
|
ELFFile<ELFT>::getStringTable(const Elf_Shdr *Section) const {
|
|
if (Section->sh_type != ELF::SHT_STRTAB)
|
|
return createError("invalid sh_type for string table, expected SHT_STRTAB");
|
|
auto V = getSectionContentsAsArray<char>(Section);
|
|
if (!V)
|
|
return V.takeError();
|
|
ArrayRef<char> Data = *V;
|
|
if (Data.empty())
|
|
return createError("empty string table");
|
|
if (Data.back() != '\0')
|
|
return createError("string table non-null terminated");
|
|
return StringRef(Data.begin(), Data.size());
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<ArrayRef<typename ELFT::Word>>
|
|
ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const {
|
|
auto SectionsOrErr = sections();
|
|
if (!SectionsOrErr)
|
|
return SectionsOrErr.takeError();
|
|
return getSHNDXTable(Section, *SectionsOrErr);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<ArrayRef<typename ELFT::Word>>
|
|
ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section,
|
|
Elf_Shdr_Range Sections) const {
|
|
assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX);
|
|
auto VOrErr = getSectionContentsAsArray<Elf_Word>(&Section);
|
|
if (!VOrErr)
|
|
return VOrErr.takeError();
|
|
ArrayRef<Elf_Word> V = *VOrErr;
|
|
auto SymTableOrErr = object::getSection<ELFT>(Sections, Section.sh_link);
|
|
if (!SymTableOrErr)
|
|
return SymTableOrErr.takeError();
|
|
const Elf_Shdr &SymTable = **SymTableOrErr;
|
|
if (SymTable.sh_type != ELF::SHT_SYMTAB &&
|
|
SymTable.sh_type != ELF::SHT_DYNSYM)
|
|
return createError("invalid sh_type");
|
|
if (V.size() != (SymTable.sh_size / sizeof(Elf_Sym)))
|
|
return createError("invalid section contents size");
|
|
return V;
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<StringRef>
|
|
ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const {
|
|
auto SectionsOrErr = sections();
|
|
if (!SectionsOrErr)
|
|
return SectionsOrErr.takeError();
|
|
return getStringTableForSymtab(Sec, *SectionsOrErr);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<StringRef>
|
|
ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec,
|
|
Elf_Shdr_Range Sections) const {
|
|
|
|
if (Sec.sh_type != ELF::SHT_SYMTAB && Sec.sh_type != ELF::SHT_DYNSYM)
|
|
return createError(
|
|
"invalid sh_type for symbol table, expected SHT_SYMTAB or SHT_DYNSYM");
|
|
auto SectionOrErr = object::getSection<ELFT>(Sections, Sec.sh_link);
|
|
if (!SectionOrErr)
|
|
return SectionOrErr.takeError();
|
|
return getStringTable(*SectionOrErr);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<StringRef>
|
|
ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
|
|
auto SectionsOrErr = sections();
|
|
if (!SectionsOrErr)
|
|
return SectionsOrErr.takeError();
|
|
auto Table = getSectionStringTable(*SectionsOrErr);
|
|
if (!Table)
|
|
return Table.takeError();
|
|
return getSectionName(Section, *Table);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<StringRef> ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section,
|
|
StringRef DotShstrtab) const {
|
|
uint32_t Offset = Section->sh_name;
|
|
if (Offset == 0)
|
|
return StringRef();
|
|
if (Offset >= DotShstrtab.size())
|
|
return createError("invalid string offset");
|
|
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
|
|
inline unsigned hashSysV(StringRef SymbolName) {
|
|
unsigned h = 0, g;
|
|
for (char C : SymbolName) {
|
|
h = (h << 4) + C;
|
|
g = h & 0xf0000000L;
|
|
if (g != 0)
|
|
h ^= g >> 24;
|
|
h &= ~g;
|
|
}
|
|
return h;
|
|
}
|
|
|
|
} // end namespace object
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_OBJECT_ELF_H
|