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This adds section group support to the tools obj2yaml and yaml2obj. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230124 91177308-0d34-0410-b5e6-96231b3b80d8
541 lines
18 KiB
C++
541 lines
18 KiB
C++
//===- yaml2elf - Convert YAML to a ELF object file -----------------------===//
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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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/// \file
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/// \brief The ELF component of yaml2obj.
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///
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//===----------------------------------------------------------------------===//
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#include "yaml2obj.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/MC/StringTableBuilder.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/ELFYAML.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/YAMLTraits.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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// This class is used to build up a contiguous binary blob while keeping
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// track of an offset in the output (which notionally begins at
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// `InitialOffset`).
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namespace {
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class ContiguousBlobAccumulator {
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const uint64_t InitialOffset;
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SmallVector<char, 128> Buf;
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raw_svector_ostream OS;
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/// \returns The new offset.
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uint64_t padToAlignment(unsigned Align) {
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uint64_t CurrentOffset = InitialOffset + OS.tell();
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uint64_t AlignedOffset = RoundUpToAlignment(CurrentOffset, Align);
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for (; CurrentOffset != AlignedOffset; ++CurrentOffset)
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OS.write('\0');
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return AlignedOffset; // == CurrentOffset;
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}
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public:
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ContiguousBlobAccumulator(uint64_t InitialOffset_)
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: InitialOffset(InitialOffset_), Buf(), OS(Buf) {}
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template <class Integer>
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raw_ostream &getOSAndAlignedOffset(Integer &Offset, unsigned Align = 16) {
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Offset = padToAlignment(Align);
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return OS;
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}
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void writeBlobToStream(raw_ostream &Out) { Out << OS.str(); }
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};
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} // end anonymous namespace
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// Used to keep track of section and symbol names, so that in the YAML file
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// sections and symbols can be referenced by name instead of by index.
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namespace {
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class NameToIdxMap {
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StringMap<int> Map;
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public:
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/// \returns true if name is already present in the map.
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bool addName(StringRef Name, unsigned i) {
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return !Map.insert(std::make_pair(Name, (int)i)).second;
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}
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/// \returns true if name is not present in the map
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bool lookup(StringRef Name, unsigned &Idx) const {
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StringMap<int>::const_iterator I = Map.find(Name);
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if (I == Map.end())
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return true;
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Idx = I->getValue();
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return false;
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}
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};
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} // end anonymous namespace
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template <class T>
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static size_t arrayDataSize(ArrayRef<T> A) {
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return A.size() * sizeof(T);
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}
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template <class T>
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static void writeArrayData(raw_ostream &OS, ArrayRef<T> A) {
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OS.write((const char *)A.data(), arrayDataSize(A));
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}
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template <class T>
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static void zero(T &Obj) {
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memset(&Obj, 0, sizeof(Obj));
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}
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namespace {
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/// \brief "Single point of truth" for the ELF file construction.
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/// TODO: This class still has a ways to go before it is truly a "single
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/// point of truth".
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template <class ELFT>
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class ELFState {
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typedef typename object::ELFFile<ELFT>::Elf_Ehdr Elf_Ehdr;
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typedef typename object::ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
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typedef typename object::ELFFile<ELFT>::Elf_Sym Elf_Sym;
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typedef typename object::ELFFile<ELFT>::Elf_Rel Elf_Rel;
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typedef typename object::ELFFile<ELFT>::Elf_Rela Elf_Rela;
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/// \brief The future ".strtab" section.
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StringTableBuilder DotStrtab;
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/// \brief The future ".shstrtab" section.
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StringTableBuilder DotShStrtab;
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NameToIdxMap SN2I;
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NameToIdxMap SymN2I;
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const ELFYAML::Object &Doc;
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bool buildSectionIndex();
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bool buildSymbolIndex(std::size_t &StartIndex,
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const std::vector<ELFYAML::Symbol> &Symbols);
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void initELFHeader(Elf_Ehdr &Header);
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bool initSectionHeaders(std::vector<Elf_Shdr> &SHeaders,
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ContiguousBlobAccumulator &CBA);
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void initSymtabSectionHeader(Elf_Shdr &SHeader,
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ContiguousBlobAccumulator &CBA);
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void initStrtabSectionHeader(Elf_Shdr &SHeader, StringRef Name,
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StringTableBuilder &STB,
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ContiguousBlobAccumulator &CBA);
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void addSymbols(const std::vector<ELFYAML::Symbol> &Symbols,
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std::vector<Elf_Sym> &Syms, unsigned SymbolBinding);
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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::RawContentSection &Section,
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ContiguousBlobAccumulator &CBA);
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bool writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::RelocationSection &Section,
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ContiguousBlobAccumulator &CBA);
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bool writeSectionContent(Elf_Shdr &SHeader, const ELFYAML::Group &Group,
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ContiguousBlobAccumulator &CBA);
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// - SHT_NULL entry (placed first, i.e. 0'th entry)
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// - symbol table (.symtab) (placed third to last)
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// - string table (.strtab) (placed second to last)
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// - section header string table (.shstrtab) (placed last)
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unsigned getDotSymTabSecNo() const { return Doc.Sections.size() + 1; }
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unsigned getDotStrTabSecNo() const { return Doc.Sections.size() + 2; }
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unsigned getDotShStrTabSecNo() const { return Doc.Sections.size() + 3; }
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unsigned getSectionCount() const { return Doc.Sections.size() + 4; }
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ELFState(const ELFYAML::Object &D) : Doc(D) {}
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public:
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static int writeELF(raw_ostream &OS, const ELFYAML::Object &Doc);
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};
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} // end anonymous namespace
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template <class ELFT>
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void ELFState<ELFT>::initELFHeader(Elf_Ehdr &Header) {
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using namespace llvm::ELF;
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zero(Header);
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Header.e_ident[EI_MAG0] = 0x7f;
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Header.e_ident[EI_MAG1] = 'E';
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Header.e_ident[EI_MAG2] = 'L';
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Header.e_ident[EI_MAG3] = 'F';
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Header.e_ident[EI_CLASS] = ELFT::Is64Bits ? ELFCLASS64 : ELFCLASS32;
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bool IsLittleEndian = ELFT::TargetEndianness == support::little;
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Header.e_ident[EI_DATA] = IsLittleEndian ? ELFDATA2LSB : ELFDATA2MSB;
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Header.e_ident[EI_VERSION] = EV_CURRENT;
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Header.e_ident[EI_OSABI] = Doc.Header.OSABI;
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Header.e_ident[EI_ABIVERSION] = 0;
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Header.e_type = Doc.Header.Type;
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Header.e_machine = Doc.Header.Machine;
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Header.e_version = EV_CURRENT;
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Header.e_entry = Doc.Header.Entry;
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Header.e_flags = Doc.Header.Flags;
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Header.e_ehsize = sizeof(Elf_Ehdr);
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Header.e_shentsize = sizeof(Elf_Shdr);
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// Immediately following the ELF header.
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Header.e_shoff = sizeof(Header);
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Header.e_shnum = getSectionCount();
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Header.e_shstrndx = getDotShStrTabSecNo();
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}
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template <class ELFT>
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bool ELFState<ELFT>::initSectionHeaders(std::vector<Elf_Shdr> &SHeaders,
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ContiguousBlobAccumulator &CBA) {
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// Ensure SHN_UNDEF entry is present. An all-zero section header is a
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// valid SHN_UNDEF entry since SHT_NULL == 0.
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Elf_Shdr SHeader;
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zero(SHeader);
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SHeaders.push_back(SHeader);
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for (const auto &Sec : Doc.Sections)
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DotShStrtab.add(Sec->Name);
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DotShStrtab.finalize(StringTableBuilder::ELF);
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for (const auto &Sec : Doc.Sections) {
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zero(SHeader);
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SHeader.sh_name = DotShStrtab.getOffset(Sec->Name);
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SHeader.sh_type = Sec->Type;
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SHeader.sh_flags = Sec->Flags;
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SHeader.sh_addr = Sec->Address;
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SHeader.sh_addralign = Sec->AddressAlign;
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if (!Sec->Link.empty()) {
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unsigned Index;
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if (SN2I.lookup(Sec->Link, Index)) {
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errs() << "error: Unknown section referenced: '" << Sec->Link
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<< "' at YAML section '" << Sec->Name << "'.\n";
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return false;
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}
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SHeader.sh_link = Index;
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}
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if (auto S = dyn_cast<ELFYAML::RawContentSection>(Sec.get()))
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writeSectionContent(SHeader, *S, CBA);
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else if (auto S = dyn_cast<ELFYAML::RelocationSection>(Sec.get())) {
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if (S->Link.empty())
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// For relocation section set link to .symtab by default.
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SHeader.sh_link = getDotSymTabSecNo();
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unsigned Index;
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if (SN2I.lookup(S->Info, Index)) {
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errs() << "error: Unknown section referenced: '" << S->Info
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<< "' at YAML section '" << S->Name << "'.\n";
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return false;
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}
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SHeader.sh_info = Index;
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if (!writeSectionContent(SHeader, *S, CBA))
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return false;
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} else if (auto S = dyn_cast<ELFYAML::Group>(Sec.get())) {
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unsigned SymIdx;
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if (SymN2I.lookup(S->Info, SymIdx)) {
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errs() << "error: Unknown symbol referenced: '" << S->Info
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<< "' at YAML section '" << S->Name << "'.\n";
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return false;
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}
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SHeader.sh_info = SymIdx;
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if (!writeSectionContent(SHeader, *S, CBA))
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return false;
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} else
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llvm_unreachable("Unknown section type");
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SHeaders.push_back(SHeader);
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}
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return true;
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}
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template <class ELFT>
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void ELFState<ELFT>::initSymtabSectionHeader(Elf_Shdr &SHeader,
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ContiguousBlobAccumulator &CBA) {
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zero(SHeader);
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SHeader.sh_name = DotShStrtab.getOffset(".symtab");
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SHeader.sh_type = ELF::SHT_SYMTAB;
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SHeader.sh_link = getDotStrTabSecNo();
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// One greater than symbol table index of the last local symbol.
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SHeader.sh_info = Doc.Symbols.Local.size() + 1;
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SHeader.sh_entsize = sizeof(Elf_Sym);
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std::vector<Elf_Sym> Syms;
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{
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// Ensure STN_UNDEF is present
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Elf_Sym Sym;
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zero(Sym);
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Syms.push_back(Sym);
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}
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// Add symbol names to .strtab.
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for (const auto &Sym : Doc.Symbols.Local)
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DotStrtab.add(Sym.Name);
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for (const auto &Sym : Doc.Symbols.Global)
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DotStrtab.add(Sym.Name);
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for (const auto &Sym : Doc.Symbols.Weak)
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DotStrtab.add(Sym.Name);
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DotStrtab.finalize(StringTableBuilder::ELF);
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addSymbols(Doc.Symbols.Local, Syms, ELF::STB_LOCAL);
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addSymbols(Doc.Symbols.Global, Syms, ELF::STB_GLOBAL);
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addSymbols(Doc.Symbols.Weak, Syms, ELF::STB_WEAK);
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writeArrayData(CBA.getOSAndAlignedOffset(SHeader.sh_offset),
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makeArrayRef(Syms));
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SHeader.sh_size = arrayDataSize(makeArrayRef(Syms));
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}
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template <class ELFT>
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void ELFState<ELFT>::initStrtabSectionHeader(Elf_Shdr &SHeader, StringRef Name,
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StringTableBuilder &STB,
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ContiguousBlobAccumulator &CBA) {
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zero(SHeader);
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SHeader.sh_name = DotShStrtab.getOffset(Name);
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SHeader.sh_type = ELF::SHT_STRTAB;
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CBA.getOSAndAlignedOffset(SHeader.sh_offset) << STB.data();
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SHeader.sh_size = STB.data().size();
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SHeader.sh_addralign = 1;
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}
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template <class ELFT>
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void ELFState<ELFT>::addSymbols(const std::vector<ELFYAML::Symbol> &Symbols,
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std::vector<Elf_Sym> &Syms,
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unsigned SymbolBinding) {
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for (const auto &Sym : Symbols) {
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Elf_Sym Symbol;
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zero(Symbol);
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if (!Sym.Name.empty())
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Symbol.st_name = DotStrtab.getOffset(Sym.Name);
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Symbol.setBindingAndType(SymbolBinding, Sym.Type);
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if (!Sym.Section.empty()) {
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unsigned Index;
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if (SN2I.lookup(Sym.Section, Index)) {
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errs() << "error: Unknown section referenced: '" << Sym.Section
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<< "' by YAML symbol " << Sym.Name << ".\n";
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exit(1);
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}
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Symbol.st_shndx = Index;
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} // else Symbol.st_shndex == SHN_UNDEF (== 0), since it was zero'd earlier.
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Symbol.st_value = Sym.Value;
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Symbol.st_other = Sym.Other;
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Symbol.st_size = Sym.Size;
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Syms.push_back(Symbol);
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}
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}
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template <class ELFT>
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void
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ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::RawContentSection &Section,
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ContiguousBlobAccumulator &CBA) {
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assert(Section.Size >= Section.Content.binary_size() &&
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"Section size and section content are inconsistent");
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raw_ostream &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset);
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Section.Content.writeAsBinary(OS);
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for (auto i = Section.Content.binary_size(); i < Section.Size; ++i)
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OS.write(0);
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SHeader.sh_entsize = 0;
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SHeader.sh_size = Section.Size;
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}
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static bool isMips64EL(const ELFYAML::Object &Doc) {
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return Doc.Header.Machine == ELFYAML::ELF_EM(llvm::ELF::EM_MIPS) &&
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Doc.Header.Class == ELFYAML::ELF_ELFCLASS(ELF::ELFCLASS64) &&
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Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB);
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}
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template <class ELFT>
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bool
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ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::RelocationSection &Section,
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ContiguousBlobAccumulator &CBA) {
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if (Section.Type != llvm::ELF::SHT_REL &&
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Section.Type != llvm::ELF::SHT_RELA) {
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errs() << "error: Invalid relocation section type.\n";
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return false;
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}
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bool IsRela = Section.Type == llvm::ELF::SHT_RELA;
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SHeader.sh_entsize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
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SHeader.sh_size = SHeader.sh_entsize * Section.Relocations.size();
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auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset);
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for (const auto &Rel : Section.Relocations) {
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unsigned SymIdx;
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if (SymN2I.lookup(Rel.Symbol, SymIdx)) {
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errs() << "error: Unknown symbol referenced: '" << Rel.Symbol
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<< "' at YAML relocation.\n";
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return false;
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}
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if (IsRela) {
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Elf_Rela REntry;
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zero(REntry);
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REntry.r_offset = Rel.Offset;
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REntry.r_addend = Rel.Addend;
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REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
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OS.write((const char *)&REntry, sizeof(REntry));
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} else {
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Elf_Rel REntry;
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zero(REntry);
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REntry.r_offset = Rel.Offset;
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REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
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OS.write((const char *)&REntry, sizeof(REntry));
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}
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}
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return true;
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}
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template <class ELFT>
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bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::Group &Section,
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ContiguousBlobAccumulator &CBA) {
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typedef typename object::ELFFile<ELFT>::Elf_Word Elf_Word;
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if (Section.Type != llvm::ELF::SHT_GROUP) {
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errs() << "error: Invalid section type.\n";
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return false;
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}
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SHeader.sh_entsize = sizeof(Elf_Word);
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SHeader.sh_size = SHeader.sh_entsize * Section.Members.size();
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auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset);
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for (auto member : Section.Members) {
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Elf_Word SIdx;
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unsigned int sectionIndex = 0;
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if (member.sectionNameOrType == "GRP_COMDAT")
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sectionIndex = llvm::ELF::GRP_COMDAT;
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else if (SN2I.lookup(member.sectionNameOrType, sectionIndex)) {
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errs() << "error: Unknown section referenced: '"
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<< member.sectionNameOrType << "' at YAML section' "
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<< Section.Name << "\n";
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return false;
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}
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SIdx = sectionIndex;
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OS.write((const char *)&SIdx, sizeof(SIdx));
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}
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return true;
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}
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template <class ELFT> bool ELFState<ELFT>::buildSectionIndex() {
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SN2I.addName(".symtab", getDotSymTabSecNo());
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SN2I.addName(".strtab", getDotStrTabSecNo());
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SN2I.addName(".shstrtab", getDotShStrTabSecNo());
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for (unsigned i = 0, e = Doc.Sections.size(); i != e; ++i) {
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StringRef Name = Doc.Sections[i]->Name;
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if (Name.empty())
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continue;
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// "+ 1" to take into account the SHT_NULL entry.
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if (SN2I.addName(Name, i + 1)) {
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errs() << "error: Repeated section name: '" << Name
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<< "' at YAML section number " << i << ".\n";
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return false;
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}
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}
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return true;
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}
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template <class ELFT>
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bool
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ELFState<ELFT>::buildSymbolIndex(std::size_t &StartIndex,
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const std::vector<ELFYAML::Symbol> &Symbols) {
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for (const auto &Sym : Symbols) {
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++StartIndex;
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if (Sym.Name.empty())
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continue;
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if (SymN2I.addName(Sym.Name, StartIndex)) {
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errs() << "error: Repeated symbol name: '" << Sym.Name << "'.\n";
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return false;
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}
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}
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return true;
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}
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template <class ELFT>
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int ELFState<ELFT>::writeELF(raw_ostream &OS, const ELFYAML::Object &Doc) {
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ELFState<ELFT> State(Doc);
|
|
if (!State.buildSectionIndex())
|
|
return 1;
|
|
|
|
std::size_t StartSymIndex = 0;
|
|
if (!State.buildSymbolIndex(StartSymIndex, Doc.Symbols.Local) ||
|
|
!State.buildSymbolIndex(StartSymIndex, Doc.Symbols.Global) ||
|
|
!State.buildSymbolIndex(StartSymIndex, Doc.Symbols.Weak))
|
|
return 1;
|
|
|
|
Elf_Ehdr Header;
|
|
State.initELFHeader(Header);
|
|
|
|
// TODO: Flesh out section header support.
|
|
// TODO: Program headers.
|
|
|
|
// XXX: This offset is tightly coupled with the order that we write
|
|
// things to `OS`.
|
|
const size_t SectionContentBeginOffset =
|
|
Header.e_ehsize + Header.e_shentsize * Header.e_shnum;
|
|
ContiguousBlobAccumulator CBA(SectionContentBeginOffset);
|
|
|
|
// Doc might not contain .symtab, .strtab and .shstrtab sections,
|
|
// but we will emit them, so make sure to add them to ShStrTabSHeader.
|
|
State.DotShStrtab.add(".symtab");
|
|
State.DotShStrtab.add(".strtab");
|
|
State.DotShStrtab.add(".shstrtab");
|
|
|
|
std::vector<Elf_Shdr> SHeaders;
|
|
if(!State.initSectionHeaders(SHeaders, CBA))
|
|
return 1;
|
|
|
|
// .symtab section.
|
|
Elf_Shdr SymtabSHeader;
|
|
State.initSymtabSectionHeader(SymtabSHeader, CBA);
|
|
SHeaders.push_back(SymtabSHeader);
|
|
|
|
// .strtab string table header.
|
|
Elf_Shdr DotStrTabSHeader;
|
|
State.initStrtabSectionHeader(DotStrTabSHeader, ".strtab", State.DotStrtab,
|
|
CBA);
|
|
SHeaders.push_back(DotStrTabSHeader);
|
|
|
|
// .shstrtab string table header.
|
|
Elf_Shdr ShStrTabSHeader;
|
|
State.initStrtabSectionHeader(ShStrTabSHeader, ".shstrtab", State.DotShStrtab,
|
|
CBA);
|
|
SHeaders.push_back(ShStrTabSHeader);
|
|
|
|
OS.write((const char *)&Header, sizeof(Header));
|
|
writeArrayData(OS, makeArrayRef(SHeaders));
|
|
CBA.writeBlobToStream(OS);
|
|
return 0;
|
|
}
|
|
|
|
static bool is64Bit(const ELFYAML::Object &Doc) {
|
|
return Doc.Header.Class == ELFYAML::ELF_ELFCLASS(ELF::ELFCLASS64);
|
|
}
|
|
|
|
static bool isLittleEndian(const ELFYAML::Object &Doc) {
|
|
return Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB);
|
|
}
|
|
|
|
int yaml2elf(yaml::Input &YIn, raw_ostream &Out) {
|
|
ELFYAML::Object Doc;
|
|
YIn >> Doc;
|
|
if (YIn.error()) {
|
|
errs() << "yaml2obj: Failed to parse YAML file!\n";
|
|
return 1;
|
|
}
|
|
using object::ELFType;
|
|
typedef ELFType<support::little, 8, true> LE64;
|
|
typedef ELFType<support::big, 8, true> BE64;
|
|
typedef ELFType<support::little, 4, false> LE32;
|
|
typedef ELFType<support::big, 4, false> BE32;
|
|
if (is64Bit(Doc)) {
|
|
if (isLittleEndian(Doc))
|
|
return ELFState<LE64>::writeELF(Out, Doc);
|
|
else
|
|
return ELFState<BE64>::writeELF(Out, Doc);
|
|
} else {
|
|
if (isLittleEndian(Doc))
|
|
return ELFState<LE32>::writeELF(Out, Doc);
|
|
else
|
|
return ELFState<BE32>::writeELF(Out, Doc);
|
|
}
|
|
}
|