forked from OSchip/llvm-project
1046 lines
38 KiB
C++
1046 lines
38 KiB
C++
//===- yaml2elf - Convert YAML to a ELF object file -----------------------===//
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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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/// \file
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/// The ELF component of yaml2obj.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/BinaryFormat/ELF.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/ObjectYAML/ELFYAML.h"
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#include "llvm/ObjectYAML/yaml2obj.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/WithColor.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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if (Align == 0)
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Align = 1;
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uint64_t CurrentOffset = InitialOffset + OS.tell();
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uint64_t AlignedOffset = alignTo(CurrentOffset, Align);
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OS.write_zeros(AlignedOffset - CurrentOffset);
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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) {
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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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// 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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class NameToIdxMap {
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StringMap<unsigned> Map;
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public:
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/// \Returns false if name is already present in the map.
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bool addName(StringRef Name, unsigned Ndx) {
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return Map.insert({Name, Ndx}).second;
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}
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/// \Returns false if name is not present in the map.
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bool lookup(StringRef Name, unsigned &Idx) const {
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auto I = Map.find(Name);
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if (I == Map.end())
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return false;
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Idx = I->getValue();
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return true;
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}
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/// Asserts if name is not present in the map.
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unsigned get(StringRef Name) const {
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unsigned Idx;
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if (lookup(Name, Idx))
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return Idx;
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assert(false && "Expected section not found in index");
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return 0;
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}
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unsigned size() const { return Map.size(); }
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};
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/// "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> class ELFState {
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typedef typename ELFT::Ehdr Elf_Ehdr;
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typedef typename ELFT::Phdr Elf_Phdr;
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typedef typename ELFT::Shdr Elf_Shdr;
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typedef typename ELFT::Sym Elf_Sym;
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typedef typename ELFT::Rel Elf_Rel;
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typedef typename ELFT::Rela Elf_Rela;
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typedef typename ELFT::Relr Elf_Relr;
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typedef typename ELFT::Dyn Elf_Dyn;
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enum class SymtabType { Static, Dynamic };
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/// The future ".strtab" section.
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StringTableBuilder DotStrtab{StringTableBuilder::ELF};
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/// The future ".shstrtab" section.
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StringTableBuilder DotShStrtab{StringTableBuilder::ELF};
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/// The future ".dynstr" section.
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StringTableBuilder DotDynstr{StringTableBuilder::ELF};
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NameToIdxMap SN2I;
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NameToIdxMap SymN2I;
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NameToIdxMap DynSymN2I;
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ELFYAML::Object &Doc;
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bool HasError = false;
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yaml::ErrorHandler ErrHandler;
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void reportError(const Twine &Msg);
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std::vector<Elf_Sym> toELFSymbols(ArrayRef<ELFYAML::Symbol> Symbols,
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const StringTableBuilder &Strtab);
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unsigned toSectionIndex(StringRef S, StringRef LocSec, StringRef LocSym = "");
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unsigned toSymbolIndex(StringRef S, StringRef LocSec, bool IsDynamic);
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void buildSectionIndex();
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void buildSymbolIndexes();
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void initProgramHeaders(std::vector<Elf_Phdr> &PHeaders);
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bool initImplicitHeader(ContiguousBlobAccumulator &CBA, Elf_Shdr &Header,
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StringRef SecName, ELFYAML::Section *YAMLSec);
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void initSectionHeaders(std::vector<Elf_Shdr> &SHeaders,
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ContiguousBlobAccumulator &CBA);
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void initSymtabSectionHeader(Elf_Shdr &SHeader, SymtabType STType,
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ContiguousBlobAccumulator &CBA,
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ELFYAML::Section *YAMLSec);
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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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ELFYAML::Section *YAMLSec);
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void setProgramHeaderLayout(std::vector<Elf_Phdr> &PHeaders,
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std::vector<Elf_Shdr> &SHeaders);
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void finalizeStrings();
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void writeELFHeader(ContiguousBlobAccumulator &CBA, raw_ostream &OS);
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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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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::RelocationSection &Section,
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ContiguousBlobAccumulator &CBA);
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void writeSectionContent(Elf_Shdr &SHeader, const ELFYAML::Group &Group,
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ContiguousBlobAccumulator &CBA);
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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::SymtabShndxSection &Shndx,
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ContiguousBlobAccumulator &CBA);
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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::SymverSection &Section,
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ContiguousBlobAccumulator &CBA);
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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::VerneedSection &Section,
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ContiguousBlobAccumulator &CBA);
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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::VerdefSection &Section,
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ContiguousBlobAccumulator &CBA);
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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::MipsABIFlags &Section,
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ContiguousBlobAccumulator &CBA);
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void writeSectionContent(Elf_Shdr &SHeader,
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const ELFYAML::DynamicSection &Section,
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ContiguousBlobAccumulator &CBA);
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ELFState(ELFYAML::Object &D, yaml::ErrorHandler EH);
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public:
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static bool writeELF(raw_ostream &OS, ELFYAML::Object &Doc,
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yaml::ErrorHandler EH);
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};
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} // end anonymous namespace
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template <class T> 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> 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> static void zero(T &Obj) { memset(&Obj, 0, sizeof(Obj)); }
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template <class ELFT>
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ELFState<ELFT>::ELFState(ELFYAML::Object &D, yaml::ErrorHandler EH)
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: Doc(D), ErrHandler(EH) {
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StringSet<> DocSections;
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for (std::unique_ptr<ELFYAML::Section> &D : Doc.Sections)
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if (!D->Name.empty())
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DocSections.insert(D->Name);
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// Insert SHT_NULL section implicitly when it is not defined in YAML.
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if (Doc.Sections.empty() || Doc.Sections.front()->Type != ELF::SHT_NULL)
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Doc.Sections.insert(
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Doc.Sections.begin(),
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std::make_unique<ELFYAML::Section>(
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ELFYAML::Section::SectionKind::RawContent, /*IsImplicit=*/true));
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std::vector<StringRef> ImplicitSections = {".symtab", ".strtab", ".shstrtab"};
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if (!Doc.DynamicSymbols.empty())
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ImplicitSections.insert(ImplicitSections.end(), {".dynsym", ".dynstr"});
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// Insert placeholders for implicit sections that are not
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// defined explicitly in YAML.
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for (StringRef SecName : ImplicitSections) {
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if (DocSections.count(SecName))
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continue;
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std::unique_ptr<ELFYAML::Section> Sec = std::make_unique<ELFYAML::Section>(
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ELFYAML::Section::SectionKind::RawContent, true /*IsImplicit*/);
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Sec->Name = SecName;
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Doc.Sections.push_back(std::move(Sec));
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}
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}
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template <class ELFT>
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void ELFState<ELFT>::writeELFHeader(ContiguousBlobAccumulator &CBA, raw_ostream &OS) {
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using namespace llvm::ELF;
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Elf_Ehdr Header;
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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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Header.e_ident[EI_DATA] = Doc.Header.Data;
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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] = Doc.Header.ABIVersion;
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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_phoff = Doc.ProgramHeaders.size() ? sizeof(Header) : 0;
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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_phentsize = Doc.ProgramHeaders.size() ? sizeof(Elf_Phdr) : 0;
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Header.e_phnum = Doc.ProgramHeaders.size();
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Header.e_shentsize =
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Doc.Header.SHEntSize ? (uint16_t)*Doc.Header.SHEntSize : sizeof(Elf_Shdr);
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// Immediately following the ELF header and program headers.
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// Align the start of the section header and write the ELF header.
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uint64_t SHOff;
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CBA.getOSAndAlignedOffset(SHOff, sizeof(typename ELFT::uint));
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Header.e_shoff =
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Doc.Header.SHOff ? typename ELFT::uint(*Doc.Header.SHOff) : SHOff;
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Header.e_shnum =
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Doc.Header.SHNum ? (uint16_t)*Doc.Header.SHNum : Doc.Sections.size();
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Header.e_shstrndx = Doc.Header.SHStrNdx ? (uint16_t)*Doc.Header.SHStrNdx
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: SN2I.get(".shstrtab");
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OS.write((const char *)&Header, sizeof(Header));
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}
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template <class ELFT>
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void ELFState<ELFT>::initProgramHeaders(std::vector<Elf_Phdr> &PHeaders) {
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for (const auto &YamlPhdr : Doc.ProgramHeaders) {
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Elf_Phdr Phdr;
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Phdr.p_type = YamlPhdr.Type;
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Phdr.p_flags = YamlPhdr.Flags;
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Phdr.p_vaddr = YamlPhdr.VAddr;
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Phdr.p_paddr = YamlPhdr.PAddr;
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PHeaders.push_back(Phdr);
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}
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}
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template <class ELFT>
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unsigned ELFState<ELFT>::toSectionIndex(StringRef S, StringRef LocSec,
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StringRef LocSym) {
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unsigned Index;
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if (SN2I.lookup(S, Index) || to_integer(S, Index))
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return Index;
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assert(LocSec.empty() || LocSym.empty());
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if (!LocSym.empty())
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reportError("unknown section referenced: '" + S + "' by YAML symbol '" +
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LocSym + "'");
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else
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reportError("unknown section referenced: '" + S + "' by YAML section '" +
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LocSec + "'");
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return 0;
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}
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template <class ELFT>
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unsigned ELFState<ELFT>::toSymbolIndex(StringRef S, StringRef LocSec,
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bool IsDynamic) {
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const NameToIdxMap &SymMap = IsDynamic ? DynSymN2I : SymN2I;
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unsigned Index;
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// Here we try to look up S in the symbol table. If it is not there,
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// treat its value as a symbol index.
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if (!SymMap.lookup(S, Index) && !to_integer(S, Index)) {
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reportError("unknown symbol referenced: '" + S + "' by YAML section '" +
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LocSec + "'");
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return 0;
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}
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return Index;
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}
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template <class ELFT>
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bool ELFState<ELFT>::initImplicitHeader(ContiguousBlobAccumulator &CBA,
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Elf_Shdr &Header, StringRef SecName,
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ELFYAML::Section *YAMLSec) {
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// Check if the header was already initialized.
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if (Header.sh_offset)
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return false;
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if (SecName == ".symtab")
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initSymtabSectionHeader(Header, SymtabType::Static, CBA, YAMLSec);
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else if (SecName == ".strtab")
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initStrtabSectionHeader(Header, SecName, DotStrtab, CBA, YAMLSec);
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else if (SecName == ".shstrtab")
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initStrtabSectionHeader(Header, SecName, DotShStrtab, CBA, YAMLSec);
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else if (SecName == ".dynsym")
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initSymtabSectionHeader(Header, SymtabType::Dynamic, CBA, YAMLSec);
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else if (SecName == ".dynstr")
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initStrtabSectionHeader(Header, SecName, DotDynstr, CBA, YAMLSec);
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else
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return false;
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// Override the fields if requested.
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if (YAMLSec) {
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if (YAMLSec->ShName)
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Header.sh_name = *YAMLSec->ShName;
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if (YAMLSec->ShOffset)
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Header.sh_offset = *YAMLSec->ShOffset;
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if (YAMLSec->ShSize)
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Header.sh_size = *YAMLSec->ShSize;
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}
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return true;
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}
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static StringRef dropUniqueSuffix(StringRef S) {
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size_t SuffixPos = S.rfind(" [");
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if (SuffixPos == StringRef::npos)
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return S;
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return S.substr(0, SuffixPos);
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}
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template <class ELFT>
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void 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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SHeaders.resize(Doc.Sections.size());
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for (size_t I = 0; I < Doc.Sections.size(); ++I) {
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ELFYAML::Section *Sec = Doc.Sections[I].get();
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if (I == 0 && Sec->IsImplicit)
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continue;
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// We have a few sections like string or symbol tables that are usually
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// added implicitly to the end. However, if they are explicitly specified
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// in the YAML, we need to write them here. This ensures the file offset
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// remains correct.
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Elf_Shdr &SHeader = SHeaders[I];
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if (initImplicitHeader(CBA, SHeader, Sec->Name,
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Sec->IsImplicit ? nullptr : Sec))
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continue;
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assert(Sec && "It can't be null unless it is an implicit section. But all "
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"implicit sections should already have been handled above.");
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SHeader.sh_name = DotShStrtab.getOffset(dropUniqueSuffix(Sec->Name));
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SHeader.sh_type = Sec->Type;
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if (Sec->Flags)
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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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SHeader.sh_link = toSectionIndex(Sec->Link, Sec->Name);
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if (I == 0) {
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if (auto RawSec = dyn_cast<ELFYAML::RawContentSection>(Sec)) {
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// We do not write any content for special SHN_UNDEF section.
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if (RawSec->Size)
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SHeader.sh_size = *RawSec->Size;
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if (RawSec->Info)
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SHeader.sh_info = *RawSec->Info;
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}
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if (Sec->EntSize)
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SHeader.sh_entsize = *Sec->EntSize;
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} else if (auto S = dyn_cast<ELFYAML::RawContentSection>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::SymtabShndxSection>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::RelocationSection>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::Group>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::MipsABIFlags>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::NoBitsSection>(Sec)) {
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SHeader.sh_entsize = 0;
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SHeader.sh_size = S->Size;
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// SHT_NOBITS section does not have content
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// so just to setup the section offset.
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CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
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} else if (auto S = dyn_cast<ELFYAML::DynamicSection>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::SymverSection>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::VerneedSection>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else if (auto S = dyn_cast<ELFYAML::VerdefSection>(Sec)) {
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writeSectionContent(SHeader, *S, CBA);
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} else {
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llvm_unreachable("Unknown section type");
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}
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// Override the fields if requested.
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if (Sec) {
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if (Sec->ShName)
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SHeader.sh_name = *Sec->ShName;
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if (Sec->ShOffset)
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SHeader.sh_offset = *Sec->ShOffset;
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if (Sec->ShSize)
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SHeader.sh_size = *Sec->ShSize;
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}
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}
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}
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static size_t findFirstNonGlobal(ArrayRef<ELFYAML::Symbol> Symbols) {
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for (size_t I = 0; I < Symbols.size(); ++I)
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if (Symbols[I].Binding.value != ELF::STB_LOCAL)
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return I;
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return Symbols.size();
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}
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static uint64_t writeRawSectionData(raw_ostream &OS,
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const ELFYAML::RawContentSection &RawSec) {
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size_t ContentSize = 0;
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if (RawSec.Content) {
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RawSec.Content->writeAsBinary(OS);
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ContentSize = RawSec.Content->binary_size();
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}
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if (!RawSec.Size)
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return ContentSize;
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|
|
OS.write_zeros(*RawSec.Size - ContentSize);
|
|
return *RawSec.Size;
|
|
}
|
|
|
|
template <class ELFT>
|
|
std::vector<typename ELFT::Sym>
|
|
ELFState<ELFT>::toELFSymbols(ArrayRef<ELFYAML::Symbol> Symbols,
|
|
const StringTableBuilder &Strtab) {
|
|
std::vector<Elf_Sym> Ret;
|
|
Ret.resize(Symbols.size() + 1);
|
|
|
|
size_t I = 0;
|
|
for (const auto &Sym : Symbols) {
|
|
Elf_Sym &Symbol = Ret[++I];
|
|
|
|
// If NameIndex, which contains the name offset, is explicitly specified, we
|
|
// use it. This is useful for preparing broken objects. Otherwise, we add
|
|
// the specified Name to the string table builder to get its offset.
|
|
if (Sym.NameIndex)
|
|
Symbol.st_name = *Sym.NameIndex;
|
|
else if (!Sym.Name.empty())
|
|
Symbol.st_name = Strtab.getOffset(dropUniqueSuffix(Sym.Name));
|
|
|
|
Symbol.setBindingAndType(Sym.Binding, Sym.Type);
|
|
if (!Sym.Section.empty())
|
|
Symbol.st_shndx = toSectionIndex(Sym.Section, "", Sym.Name);
|
|
else if (Sym.Index)
|
|
Symbol.st_shndx = *Sym.Index;
|
|
|
|
Symbol.st_value = Sym.Value;
|
|
Symbol.st_other = Sym.Other ? *Sym.Other : 0;
|
|
Symbol.st_size = Sym.Size;
|
|
}
|
|
|
|
return Ret;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::initSymtabSectionHeader(Elf_Shdr &SHeader,
|
|
SymtabType STType,
|
|
ContiguousBlobAccumulator &CBA,
|
|
ELFYAML::Section *YAMLSec) {
|
|
|
|
bool IsStatic = STType == SymtabType::Static;
|
|
const auto &Symbols = IsStatic ? Doc.Symbols : Doc.DynamicSymbols;
|
|
|
|
ELFYAML::RawContentSection *RawSec =
|
|
dyn_cast_or_null<ELFYAML::RawContentSection>(YAMLSec);
|
|
if (RawSec && !Symbols.empty() && (RawSec->Content || RawSec->Size)) {
|
|
if (RawSec->Content)
|
|
reportError("cannot specify both `Content` and " +
|
|
(IsStatic ? Twine("`Symbols`") : Twine("`DynamicSymbols`")) +
|
|
" for symbol table section '" + RawSec->Name + "'");
|
|
if (RawSec->Size)
|
|
reportError("cannot specify both `Size` and " +
|
|
(IsStatic ? Twine("`Symbols`") : Twine("`DynamicSymbols`")) +
|
|
" for symbol table section '" + RawSec->Name + "'");
|
|
return;
|
|
}
|
|
|
|
zero(SHeader);
|
|
SHeader.sh_name = DotShStrtab.getOffset(IsStatic ? ".symtab" : ".dynsym");
|
|
|
|
if (YAMLSec)
|
|
SHeader.sh_type = YAMLSec->Type;
|
|
else
|
|
SHeader.sh_type = IsStatic ? ELF::SHT_SYMTAB : ELF::SHT_DYNSYM;
|
|
|
|
if (RawSec && !RawSec->Link.empty()) {
|
|
// If the Link field is explicitly defined in the document,
|
|
// we should use it.
|
|
SHeader.sh_link = toSectionIndex(RawSec->Link, RawSec->Name);
|
|
} else {
|
|
// When we describe the .dynsym section in the document explicitly, it is
|
|
// allowed to omit the "DynamicSymbols" tag. In this case .dynstr is not
|
|
// added implicitly and we should be able to leave the Link zeroed if
|
|
// .dynstr is not defined.
|
|
unsigned Link = 0;
|
|
if (IsStatic)
|
|
Link = SN2I.get(".strtab");
|
|
else
|
|
SN2I.lookup(".dynstr", Link);
|
|
SHeader.sh_link = Link;
|
|
}
|
|
|
|
if (YAMLSec && YAMLSec->Flags)
|
|
SHeader.sh_flags = *YAMLSec->Flags;
|
|
else if (!IsStatic)
|
|
SHeader.sh_flags = ELF::SHF_ALLOC;
|
|
|
|
// If the symbol table section is explicitly described in the YAML
|
|
// then we should set the fields requested.
|
|
SHeader.sh_info = (RawSec && RawSec->Info) ? (unsigned)(*RawSec->Info)
|
|
: findFirstNonGlobal(Symbols) + 1;
|
|
SHeader.sh_entsize = (YAMLSec && YAMLSec->EntSize)
|
|
? (uint64_t)(*YAMLSec->EntSize)
|
|
: sizeof(Elf_Sym);
|
|
SHeader.sh_addralign = YAMLSec ? (uint64_t)YAMLSec->AddressAlign : 8;
|
|
SHeader.sh_addr = YAMLSec ? (uint64_t)YAMLSec->Address : 0;
|
|
|
|
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
if (RawSec && (RawSec->Content || RawSec->Size)) {
|
|
assert(Symbols.empty());
|
|
SHeader.sh_size = writeRawSectionData(OS, *RawSec);
|
|
return;
|
|
}
|
|
|
|
std::vector<Elf_Sym> Syms =
|
|
toELFSymbols(Symbols, IsStatic ? DotStrtab : DotDynstr);
|
|
writeArrayData(OS, makeArrayRef(Syms));
|
|
SHeader.sh_size = arrayDataSize(makeArrayRef(Syms));
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::initStrtabSectionHeader(Elf_Shdr &SHeader, StringRef Name,
|
|
StringTableBuilder &STB,
|
|
ContiguousBlobAccumulator &CBA,
|
|
ELFYAML::Section *YAMLSec) {
|
|
zero(SHeader);
|
|
SHeader.sh_name = DotShStrtab.getOffset(Name);
|
|
SHeader.sh_type = YAMLSec ? YAMLSec->Type : ELF::SHT_STRTAB;
|
|
SHeader.sh_addralign = YAMLSec ? (uint64_t)YAMLSec->AddressAlign : 1;
|
|
|
|
ELFYAML::RawContentSection *RawSec =
|
|
dyn_cast_or_null<ELFYAML::RawContentSection>(YAMLSec);
|
|
|
|
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
if (RawSec && (RawSec->Content || RawSec->Size)) {
|
|
SHeader.sh_size = writeRawSectionData(OS, *RawSec);
|
|
} else {
|
|
STB.write(OS);
|
|
SHeader.sh_size = STB.getSize();
|
|
}
|
|
|
|
if (YAMLSec && YAMLSec->EntSize)
|
|
SHeader.sh_entsize = *YAMLSec->EntSize;
|
|
|
|
if (RawSec && RawSec->Info)
|
|
SHeader.sh_info = *RawSec->Info;
|
|
|
|
if (YAMLSec && YAMLSec->Flags)
|
|
SHeader.sh_flags = *YAMLSec->Flags;
|
|
else if (Name == ".dynstr")
|
|
SHeader.sh_flags = ELF::SHF_ALLOC;
|
|
|
|
// If the section is explicitly described in the YAML
|
|
// then we want to use its section address.
|
|
if (YAMLSec)
|
|
SHeader.sh_addr = YAMLSec->Address;
|
|
}
|
|
|
|
template <class ELFT> void ELFState<ELFT>::reportError(const Twine &Msg) {
|
|
ErrHandler(Msg);
|
|
HasError = true;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::setProgramHeaderLayout(std::vector<Elf_Phdr> &PHeaders,
|
|
std::vector<Elf_Shdr> &SHeaders) {
|
|
uint32_t PhdrIdx = 0;
|
|
for (auto &YamlPhdr : Doc.ProgramHeaders) {
|
|
Elf_Phdr &PHeader = PHeaders[PhdrIdx++];
|
|
|
|
std::vector<Elf_Shdr *> Sections;
|
|
for (const ELFYAML::SectionName &SecName : YamlPhdr.Sections) {
|
|
unsigned Index;
|
|
if (!SN2I.lookup(SecName.Section, Index)) {
|
|
reportError("unknown section referenced: '" + SecName.Section +
|
|
"' by program header");
|
|
continue;
|
|
}
|
|
Sections.push_back(&SHeaders[Index]);
|
|
}
|
|
|
|
if (YamlPhdr.Offset) {
|
|
PHeader.p_offset = *YamlPhdr.Offset;
|
|
} else {
|
|
if (YamlPhdr.Sections.size())
|
|
PHeader.p_offset = UINT32_MAX;
|
|
else
|
|
PHeader.p_offset = 0;
|
|
|
|
// Find the minimum offset for the program header.
|
|
for (Elf_Shdr *SHeader : Sections)
|
|
PHeader.p_offset = std::min(PHeader.p_offset, SHeader->sh_offset);
|
|
}
|
|
|
|
// Find the maximum offset of the end of a section in order to set p_filesz
|
|
// and p_memsz. When setting p_filesz, trailing SHT_NOBITS sections are not
|
|
// counted.
|
|
uint64_t FileOffset = PHeader.p_offset, MemOffset = PHeader.p_offset;
|
|
for (Elf_Shdr *SHeader : Sections) {
|
|
uint64_t End = SHeader->sh_offset + SHeader->sh_size;
|
|
MemOffset = std::max(MemOffset, End);
|
|
|
|
if (SHeader->sh_type != llvm::ELF::SHT_NOBITS)
|
|
FileOffset = std::max(FileOffset, End);
|
|
}
|
|
|
|
// Set the file size and the memory size if not set explicitly.
|
|
PHeader.p_filesz = YamlPhdr.FileSize ? uint64_t(*YamlPhdr.FileSize)
|
|
: FileOffset - PHeader.p_offset;
|
|
PHeader.p_memsz = YamlPhdr.MemSize ? uint64_t(*YamlPhdr.MemSize)
|
|
: MemOffset - PHeader.p_offset;
|
|
|
|
if (YamlPhdr.Align) {
|
|
PHeader.p_align = *YamlPhdr.Align;
|
|
} else {
|
|
// Set the alignment of the segment to be the maximum alignment of the
|
|
// sections so that by default the segment has a valid and sensible
|
|
// alignment.
|
|
PHeader.p_align = 1;
|
|
for (Elf_Shdr *SHeader : Sections)
|
|
PHeader.p_align = std::max(PHeader.p_align, SHeader->sh_addralign);
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(
|
|
Elf_Shdr &SHeader, const ELFYAML::RawContentSection &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
raw_ostream &OS =
|
|
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
SHeader.sh_size = writeRawSectionData(OS, Section);
|
|
|
|
if (Section.EntSize)
|
|
SHeader.sh_entsize = *Section.EntSize;
|
|
else if (Section.Type == llvm::ELF::SHT_RELR)
|
|
SHeader.sh_entsize = sizeof(Elf_Relr);
|
|
else
|
|
SHeader.sh_entsize = 0;
|
|
|
|
if (Section.Info)
|
|
SHeader.sh_info = *Section.Info;
|
|
}
|
|
|
|
static bool isMips64EL(const ELFYAML::Object &Doc) {
|
|
return Doc.Header.Machine == ELFYAML::ELF_EM(llvm::ELF::EM_MIPS) &&
|
|
Doc.Header.Class == ELFYAML::ELF_ELFCLASS(ELF::ELFCLASS64) &&
|
|
Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB);
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(
|
|
Elf_Shdr &SHeader, const ELFYAML::RelocationSection &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
assert((Section.Type == llvm::ELF::SHT_REL ||
|
|
Section.Type == llvm::ELF::SHT_RELA) &&
|
|
"Section type is not SHT_REL nor SHT_RELA");
|
|
|
|
bool IsRela = Section.Type == llvm::ELF::SHT_RELA;
|
|
SHeader.sh_entsize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
|
|
SHeader.sh_size = SHeader.sh_entsize * Section.Relocations.size();
|
|
|
|
// For relocation section set link to .symtab by default.
|
|
if (Section.Link.empty())
|
|
SHeader.sh_link = SN2I.get(".symtab");
|
|
|
|
if (!Section.RelocatableSec.empty())
|
|
SHeader.sh_info = toSectionIndex(Section.RelocatableSec, Section.Name);
|
|
|
|
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
for (const auto &Rel : Section.Relocations) {
|
|
unsigned SymIdx = Rel.Symbol ? toSymbolIndex(*Rel.Symbol, Section.Name,
|
|
Section.Link == ".dynsym")
|
|
: 0;
|
|
if (IsRela) {
|
|
Elf_Rela REntry;
|
|
zero(REntry);
|
|
REntry.r_offset = Rel.Offset;
|
|
REntry.r_addend = Rel.Addend;
|
|
REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
|
|
OS.write((const char *)&REntry, sizeof(REntry));
|
|
} else {
|
|
Elf_Rel REntry;
|
|
zero(REntry);
|
|
REntry.r_offset = Rel.Offset;
|
|
REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
|
|
OS.write((const char *)&REntry, sizeof(REntry));
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(
|
|
Elf_Shdr &SHeader, const ELFYAML::SymtabShndxSection &Shndx,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
raw_ostream &OS =
|
|
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
|
|
for (uint32_t E : Shndx.Entries)
|
|
support::endian::write<uint32_t>(OS, E, ELFT::TargetEndianness);
|
|
|
|
SHeader.sh_entsize = Shndx.EntSize ? (uint64_t)*Shndx.EntSize : 4;
|
|
SHeader.sh_size = Shndx.Entries.size() * SHeader.sh_entsize;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
|
|
const ELFYAML::Group &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
assert(Section.Type == llvm::ELF::SHT_GROUP &&
|
|
"Section type is not SHT_GROUP");
|
|
|
|
SHeader.sh_entsize = 4;
|
|
SHeader.sh_size = SHeader.sh_entsize * Section.Members.size();
|
|
SHeader.sh_info =
|
|
toSymbolIndex(Section.Signature, Section.Name, /*IsDynamic=*/false);
|
|
|
|
raw_ostream &OS =
|
|
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
|
|
for (const ELFYAML::SectionOrType &Member : Section.Members) {
|
|
unsigned int SectionIndex = 0;
|
|
if (Member.sectionNameOrType == "GRP_COMDAT")
|
|
SectionIndex = llvm::ELF::GRP_COMDAT;
|
|
else
|
|
SectionIndex = toSectionIndex(Member.sectionNameOrType, Section.Name);
|
|
support::endian::write<uint32_t>(OS, SectionIndex, ELFT::TargetEndianness);
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
|
|
const ELFYAML::SymverSection &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
raw_ostream &OS =
|
|
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
for (uint16_t Version : Section.Entries)
|
|
support::endian::write<uint16_t>(OS, Version, ELFT::TargetEndianness);
|
|
|
|
SHeader.sh_entsize = Section.EntSize ? (uint64_t)*Section.EntSize : 2;
|
|
SHeader.sh_size = Section.Entries.size() * SHeader.sh_entsize;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
|
|
const ELFYAML::VerdefSection &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
typedef typename ELFT::Verdef Elf_Verdef;
|
|
typedef typename ELFT::Verdaux Elf_Verdaux;
|
|
raw_ostream &OS =
|
|
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
|
|
uint64_t AuxCnt = 0;
|
|
for (size_t I = 0; I < Section.Entries.size(); ++I) {
|
|
const ELFYAML::VerdefEntry &E = Section.Entries[I];
|
|
|
|
Elf_Verdef VerDef;
|
|
VerDef.vd_version = E.Version;
|
|
VerDef.vd_flags = E.Flags;
|
|
VerDef.vd_ndx = E.VersionNdx;
|
|
VerDef.vd_hash = E.Hash;
|
|
VerDef.vd_aux = sizeof(Elf_Verdef);
|
|
VerDef.vd_cnt = E.VerNames.size();
|
|
if (I == Section.Entries.size() - 1)
|
|
VerDef.vd_next = 0;
|
|
else
|
|
VerDef.vd_next =
|
|
sizeof(Elf_Verdef) + E.VerNames.size() * sizeof(Elf_Verdaux);
|
|
OS.write((const char *)&VerDef, sizeof(Elf_Verdef));
|
|
|
|
for (size_t J = 0; J < E.VerNames.size(); ++J, ++AuxCnt) {
|
|
Elf_Verdaux VernAux;
|
|
VernAux.vda_name = DotDynstr.getOffset(E.VerNames[J]);
|
|
if (J == E.VerNames.size() - 1)
|
|
VernAux.vda_next = 0;
|
|
else
|
|
VernAux.vda_next = sizeof(Elf_Verdaux);
|
|
OS.write((const char *)&VernAux, sizeof(Elf_Verdaux));
|
|
}
|
|
}
|
|
|
|
SHeader.sh_size = Section.Entries.size() * sizeof(Elf_Verdef) +
|
|
AuxCnt * sizeof(Elf_Verdaux);
|
|
SHeader.sh_info = Section.Info;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
|
|
const ELFYAML::VerneedSection &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
typedef typename ELFT::Verneed Elf_Verneed;
|
|
typedef typename ELFT::Vernaux Elf_Vernaux;
|
|
|
|
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
|
|
uint64_t AuxCnt = 0;
|
|
for (size_t I = 0; I < Section.VerneedV.size(); ++I) {
|
|
const ELFYAML::VerneedEntry &VE = Section.VerneedV[I];
|
|
|
|
Elf_Verneed VerNeed;
|
|
VerNeed.vn_version = VE.Version;
|
|
VerNeed.vn_file = DotDynstr.getOffset(VE.File);
|
|
if (I == Section.VerneedV.size() - 1)
|
|
VerNeed.vn_next = 0;
|
|
else
|
|
VerNeed.vn_next =
|
|
sizeof(Elf_Verneed) + VE.AuxV.size() * sizeof(Elf_Vernaux);
|
|
VerNeed.vn_cnt = VE.AuxV.size();
|
|
VerNeed.vn_aux = sizeof(Elf_Verneed);
|
|
OS.write((const char *)&VerNeed, sizeof(Elf_Verneed));
|
|
|
|
for (size_t J = 0; J < VE.AuxV.size(); ++J, ++AuxCnt) {
|
|
const ELFYAML::VernauxEntry &VAuxE = VE.AuxV[J];
|
|
|
|
Elf_Vernaux VernAux;
|
|
VernAux.vna_hash = VAuxE.Hash;
|
|
VernAux.vna_flags = VAuxE.Flags;
|
|
VernAux.vna_other = VAuxE.Other;
|
|
VernAux.vna_name = DotDynstr.getOffset(VAuxE.Name);
|
|
if (J == VE.AuxV.size() - 1)
|
|
VernAux.vna_next = 0;
|
|
else
|
|
VernAux.vna_next = sizeof(Elf_Vernaux);
|
|
OS.write((const char *)&VernAux, sizeof(Elf_Vernaux));
|
|
}
|
|
}
|
|
|
|
SHeader.sh_size = Section.VerneedV.size() * sizeof(Elf_Verneed) +
|
|
AuxCnt * sizeof(Elf_Vernaux);
|
|
SHeader.sh_info = Section.Info;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
|
|
const ELFYAML::MipsABIFlags &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
assert(Section.Type == llvm::ELF::SHT_MIPS_ABIFLAGS &&
|
|
"Section type is not SHT_MIPS_ABIFLAGS");
|
|
|
|
object::Elf_Mips_ABIFlags<ELFT> Flags;
|
|
zero(Flags);
|
|
SHeader.sh_entsize = sizeof(Flags);
|
|
SHeader.sh_size = SHeader.sh_entsize;
|
|
|
|
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
Flags.version = Section.Version;
|
|
Flags.isa_level = Section.ISALevel;
|
|
Flags.isa_rev = Section.ISARevision;
|
|
Flags.gpr_size = Section.GPRSize;
|
|
Flags.cpr1_size = Section.CPR1Size;
|
|
Flags.cpr2_size = Section.CPR2Size;
|
|
Flags.fp_abi = Section.FpABI;
|
|
Flags.isa_ext = Section.ISAExtension;
|
|
Flags.ases = Section.ASEs;
|
|
Flags.flags1 = Section.Flags1;
|
|
Flags.flags2 = Section.Flags2;
|
|
OS.write((const char *)&Flags, sizeof(Flags));
|
|
}
|
|
|
|
template <class ELFT>
|
|
void ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
|
|
const ELFYAML::DynamicSection &Section,
|
|
ContiguousBlobAccumulator &CBA) {
|
|
typedef typename ELFT::uint uintX_t;
|
|
|
|
assert(Section.Type == llvm::ELF::SHT_DYNAMIC &&
|
|
"Section type is not SHT_DYNAMIC");
|
|
|
|
if (!Section.Entries.empty() && Section.Content)
|
|
reportError("cannot specify both raw content and explicit entries "
|
|
"for dynamic section '" +
|
|
Section.Name + "'");
|
|
|
|
if (Section.Content)
|
|
SHeader.sh_size = Section.Content->binary_size();
|
|
else
|
|
SHeader.sh_size = 2 * sizeof(uintX_t) * Section.Entries.size();
|
|
if (Section.EntSize)
|
|
SHeader.sh_entsize = *Section.EntSize;
|
|
else
|
|
SHeader.sh_entsize = sizeof(Elf_Dyn);
|
|
|
|
raw_ostream &OS =
|
|
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
|
|
for (const ELFYAML::DynamicEntry &DE : Section.Entries) {
|
|
support::endian::write<uintX_t>(OS, DE.Tag, ELFT::TargetEndianness);
|
|
support::endian::write<uintX_t>(OS, DE.Val, ELFT::TargetEndianness);
|
|
}
|
|
if (Section.Content)
|
|
Section.Content->writeAsBinary(OS);
|
|
}
|
|
|
|
template <class ELFT> void ELFState<ELFT>::buildSectionIndex() {
|
|
for (unsigned I = 0, E = Doc.Sections.size(); I != E; ++I) {
|
|
StringRef Name = Doc.Sections[I]->Name;
|
|
if (Name.empty())
|
|
continue;
|
|
|
|
DotShStrtab.add(dropUniqueSuffix(Name));
|
|
if (!SN2I.addName(Name, I))
|
|
reportError("repeated section name: '" + Name +
|
|
"' at YAML section number " + Twine(I));
|
|
}
|
|
|
|
DotShStrtab.finalize();
|
|
}
|
|
|
|
template <class ELFT> void ELFState<ELFT>::buildSymbolIndexes() {
|
|
auto Build = [this](ArrayRef<ELFYAML::Symbol> V, NameToIdxMap &Map) {
|
|
for (size_t I = 0, S = V.size(); I < S; ++I) {
|
|
const ELFYAML::Symbol &Sym = V[I];
|
|
if (!Sym.Name.empty() && !Map.addName(Sym.Name, I + 1))
|
|
reportError("repeated symbol name: '" + Sym.Name + "'");
|
|
}
|
|
};
|
|
|
|
Build(Doc.Symbols, SymN2I);
|
|
Build(Doc.DynamicSymbols, DynSymN2I);
|
|
}
|
|
|
|
template <class ELFT> void ELFState<ELFT>::finalizeStrings() {
|
|
// Add the regular symbol names to .strtab section.
|
|
for (const ELFYAML::Symbol &Sym : Doc.Symbols)
|
|
DotStrtab.add(dropUniqueSuffix(Sym.Name));
|
|
DotStrtab.finalize();
|
|
|
|
// Add the dynamic symbol names to .dynstr section.
|
|
for (const ELFYAML::Symbol &Sym : Doc.DynamicSymbols)
|
|
DotDynstr.add(dropUniqueSuffix(Sym.Name));
|
|
|
|
// SHT_GNU_verdef and SHT_GNU_verneed sections might also
|
|
// add strings to .dynstr section.
|
|
for (const std::unique_ptr<ELFYAML::Section> &Sec : Doc.Sections) {
|
|
if (auto VerNeed = dyn_cast<ELFYAML::VerneedSection>(Sec.get())) {
|
|
for (const ELFYAML::VerneedEntry &VE : VerNeed->VerneedV) {
|
|
DotDynstr.add(VE.File);
|
|
for (const ELFYAML::VernauxEntry &Aux : VE.AuxV)
|
|
DotDynstr.add(Aux.Name);
|
|
}
|
|
} else if (auto VerDef = dyn_cast<ELFYAML::VerdefSection>(Sec.get())) {
|
|
for (const ELFYAML::VerdefEntry &E : VerDef->Entries)
|
|
for (StringRef Name : E.VerNames)
|
|
DotDynstr.add(Name);
|
|
}
|
|
}
|
|
|
|
DotDynstr.finalize();
|
|
}
|
|
|
|
template <class ELFT>
|
|
bool ELFState<ELFT>::writeELF(raw_ostream &OS, ELFYAML::Object &Doc,
|
|
yaml::ErrorHandler EH) {
|
|
ELFState<ELFT> State(Doc, EH);
|
|
|
|
// Finalize .strtab and .dynstr sections. We do that early because want to
|
|
// finalize the string table builders before writing the content of the
|
|
// sections that might want to use them.
|
|
State.finalizeStrings();
|
|
|
|
State.buildSectionIndex();
|
|
State.buildSymbolIndexes();
|
|
|
|
std::vector<Elf_Phdr> PHeaders;
|
|
State.initProgramHeaders(PHeaders);
|
|
|
|
// XXX: This offset is tightly coupled with the order that we write
|
|
// things to `OS`.
|
|
const size_t SectionContentBeginOffset =
|
|
sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * Doc.ProgramHeaders.size();
|
|
ContiguousBlobAccumulator CBA(SectionContentBeginOffset);
|
|
|
|
std::vector<Elf_Shdr> SHeaders;
|
|
State.initSectionHeaders(SHeaders, CBA);
|
|
|
|
// Now we can decide segment offsets
|
|
State.setProgramHeaderLayout(PHeaders, SHeaders);
|
|
|
|
if (State.HasError)
|
|
return false;
|
|
|
|
State.writeELFHeader(CBA, OS);
|
|
writeArrayData(OS, makeArrayRef(PHeaders));
|
|
CBA.writeBlobToStream(OS);
|
|
writeArrayData(OS, makeArrayRef(SHeaders));
|
|
return true;
|
|
}
|
|
|
|
namespace llvm {
|
|
namespace yaml {
|
|
|
|
bool yaml2elf(llvm::ELFYAML::Object &Doc, raw_ostream &Out, ErrorHandler EH) {
|
|
bool IsLE = Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB);
|
|
bool Is64Bit = Doc.Header.Class == ELFYAML::ELF_ELFCLASS(ELF::ELFCLASS64);
|
|
if (Is64Bit) {
|
|
if (IsLE)
|
|
return ELFState<object::ELF64LE>::writeELF(Out, Doc, EH);
|
|
return ELFState<object::ELF64BE>::writeELF(Out, Doc, EH);
|
|
}
|
|
if (IsLE)
|
|
return ELFState<object::ELF32LE>::writeELF(Out, Doc, EH);
|
|
return ELFState<object::ELF32BE>::writeELF(Out, Doc, EH);
|
|
}
|
|
|
|
} // namespace yaml
|
|
} // namespace llvm
|