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548 lines
17 KiB
C++
548 lines
17 KiB
C++
//===------ utils/elf2yaml.cpp - obj2yaml conversion tool -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Error.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/STLExtras.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/Support/ErrorHandling.h"
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#include "llvm/Support/YAMLTraits.h"
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using namespace llvm;
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namespace {
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template <class ELFT>
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class ELFDumper {
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typedef object::Elf_Sym_Impl<ELFT> Elf_Sym;
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typedef typename ELFT::Shdr Elf_Shdr;
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typedef typename ELFT::Word Elf_Word;
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typedef typename ELFT::Rel Elf_Rel;
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typedef typename ELFT::Rela Elf_Rela;
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ArrayRef<Elf_Shdr> Sections;
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// If the file has multiple sections with the same name, we add a
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// suffix to make them unique.
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unsigned Suffix = 0;
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DenseSet<StringRef> UsedSectionNames;
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std::vector<std::string> SectionNames;
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Expected<StringRef> getUniquedSectionName(const Elf_Shdr *Sec);
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Expected<StringRef> getSymbolName(const Elf_Sym *Sym, StringRef StrTable,
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const Elf_Shdr *SymTab);
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const object::ELFFile<ELFT> &Obj;
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ArrayRef<Elf_Word> ShndxTable;
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std::error_code dumpSymbols(const Elf_Shdr *Symtab,
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ELFYAML::LocalGlobalWeakSymbols &Symbols);
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std::error_code dumpSymbol(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
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StringRef StrTable, ELFYAML::Symbol &S);
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std::error_code dumpCommonSection(const Elf_Shdr *Shdr, ELFYAML::Section &S);
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std::error_code dumpCommonRelocationSection(const Elf_Shdr *Shdr,
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ELFYAML::RelocationSection &S);
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template <class RelT>
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std::error_code dumpRelocation(const RelT *Rel, const Elf_Shdr *SymTab,
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ELFYAML::Relocation &R);
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ErrorOr<ELFYAML::RelocationSection *> dumpRelSection(const Elf_Shdr *Shdr);
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ErrorOr<ELFYAML::RelocationSection *> dumpRelaSection(const Elf_Shdr *Shdr);
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ErrorOr<ELFYAML::RawContentSection *>
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dumpContentSection(const Elf_Shdr *Shdr);
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ErrorOr<ELFYAML::NoBitsSection *> dumpNoBitsSection(const Elf_Shdr *Shdr);
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ErrorOr<ELFYAML::Group *> dumpGroup(const Elf_Shdr *Shdr);
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ErrorOr<ELFYAML::MipsABIFlags *> dumpMipsABIFlags(const Elf_Shdr *Shdr);
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public:
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ELFDumper(const object::ELFFile<ELFT> &O);
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ErrorOr<ELFYAML::Object *> dump();
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};
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}
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template <class ELFT>
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ELFDumper<ELFT>::ELFDumper(const object::ELFFile<ELFT> &O)
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: Obj(O) {}
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template <class ELFT>
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Expected<StringRef>
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ELFDumper<ELFT>::getUniquedSectionName(const Elf_Shdr *Sec) {
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unsigned SecIndex = Sec - &Sections[0];
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assert(&Sections[SecIndex] == Sec);
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if (!SectionNames[SecIndex].empty())
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return SectionNames[SecIndex];
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auto NameOrErr = Obj.getSectionName(Sec);
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if (!NameOrErr)
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return NameOrErr;
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StringRef Name = *NameOrErr;
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std::string &Ret = SectionNames[SecIndex];
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Ret = Name;
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while (!UsedSectionNames.insert(Ret).second)
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Ret = (Name + to_string(++Suffix)).str();
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return Ret;
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}
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template <class ELFT>
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Expected<StringRef> ELFDumper<ELFT>::getSymbolName(const Elf_Sym *Sym,
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StringRef StrTable,
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const Elf_Shdr *SymTab) {
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Expected<StringRef> SymbolNameOrErr = Sym->getName(StrTable);
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if (!SymbolNameOrErr)
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return SymbolNameOrErr;
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StringRef Name = *SymbolNameOrErr;
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if (Name.empty() && Sym->getType() == ELF::STT_SECTION) {
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auto ShdrOrErr = Obj.getSection(Sym, SymTab, ShndxTable);
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if (!ShdrOrErr)
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return ShdrOrErr.takeError();
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return getUniquedSectionName(*ShdrOrErr);
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}
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return Name;
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}
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template <class ELFT> ErrorOr<ELFYAML::Object *> ELFDumper<ELFT>::dump() {
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auto Y = make_unique<ELFYAML::Object>();
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// Dump header
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Y->Header.Class = ELFYAML::ELF_ELFCLASS(Obj.getHeader()->getFileClass());
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Y->Header.Data = ELFYAML::ELF_ELFDATA(Obj.getHeader()->getDataEncoding());
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Y->Header.OSABI = Obj.getHeader()->e_ident[ELF::EI_OSABI];
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Y->Header.Type = Obj.getHeader()->e_type;
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Y->Header.Machine = Obj.getHeader()->e_machine;
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Y->Header.Flags = Obj.getHeader()->e_flags;
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Y->Header.Entry = Obj.getHeader()->e_entry;
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const Elf_Shdr *Symtab = nullptr;
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const Elf_Shdr *DynSymtab = nullptr;
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// Dump sections
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auto SectionsOrErr = Obj.sections();
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if (!SectionsOrErr)
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return errorToErrorCode(SectionsOrErr.takeError());
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Sections = *SectionsOrErr;
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SectionNames.resize(Sections.size());
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for (const Elf_Shdr &Sec : Sections) {
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switch (Sec.sh_type) {
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case ELF::SHT_NULL:
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case ELF::SHT_STRTAB:
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// Do not dump these sections.
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break;
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case ELF::SHT_SYMTAB:
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Symtab = &Sec;
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break;
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case ELF::SHT_DYNSYM:
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DynSymtab = &Sec;
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break;
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case ELF::SHT_SYMTAB_SHNDX: {
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auto TableOrErr = Obj.getSHNDXTable(Sec);
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if (!TableOrErr)
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return errorToErrorCode(TableOrErr.takeError());
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ShndxTable = *TableOrErr;
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break;
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}
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case ELF::SHT_RELA: {
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ErrorOr<ELFYAML::RelocationSection *> S = dumpRelaSection(&Sec);
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if (std::error_code EC = S.getError())
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return EC;
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Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
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break;
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}
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case ELF::SHT_REL: {
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ErrorOr<ELFYAML::RelocationSection *> S = dumpRelSection(&Sec);
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if (std::error_code EC = S.getError())
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return EC;
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Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
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break;
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}
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case ELF::SHT_GROUP: {
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ErrorOr<ELFYAML::Group *> G = dumpGroup(&Sec);
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if (std::error_code EC = G.getError())
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return EC;
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Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(G.get()));
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break;
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}
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case ELF::SHT_MIPS_ABIFLAGS: {
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ErrorOr<ELFYAML::MipsABIFlags *> G = dumpMipsABIFlags(&Sec);
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if (std::error_code EC = G.getError())
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return EC;
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Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(G.get()));
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break;
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}
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case ELF::SHT_NOBITS: {
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ErrorOr<ELFYAML::NoBitsSection *> S = dumpNoBitsSection(&Sec);
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if (std::error_code EC = S.getError())
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return EC;
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Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
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break;
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}
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default: {
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ErrorOr<ELFYAML::RawContentSection *> S = dumpContentSection(&Sec);
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if (std::error_code EC = S.getError())
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return EC;
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Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
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}
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}
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}
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if (auto EC = dumpSymbols(Symtab, Y->Symbols))
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return EC;
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if (auto EC = dumpSymbols(DynSymtab, Y->DynamicSymbols))
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return EC;
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return Y.release();
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}
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template <class ELFT>
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std::error_code
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ELFDumper<ELFT>::dumpSymbols(const Elf_Shdr *Symtab,
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ELFYAML::LocalGlobalWeakSymbols &Symbols) {
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if (!Symtab)
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return std::error_code();
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auto StrTableOrErr = Obj.getStringTableForSymtab(*Symtab);
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if (!StrTableOrErr)
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return errorToErrorCode(StrTableOrErr.takeError());
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StringRef StrTable = *StrTableOrErr;
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auto SymtabOrErr = Obj.symbols(Symtab);
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if (!SymtabOrErr)
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return errorToErrorCode(SymtabOrErr.takeError());
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bool IsFirstSym = true;
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for (const auto &Sym : *SymtabOrErr) {
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if (IsFirstSym) {
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IsFirstSym = false;
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continue;
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}
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ELFYAML::Symbol S;
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if (auto EC = dumpSymbol(&Sym, Symtab, StrTable, S))
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return EC;
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switch (Sym.getBinding()) {
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case ELF::STB_LOCAL:
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Symbols.Local.push_back(S);
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break;
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case ELF::STB_GLOBAL:
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Symbols.Global.push_back(S);
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break;
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case ELF::STB_WEAK:
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Symbols.Weak.push_back(S);
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break;
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default:
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llvm_unreachable("Unknown ELF symbol binding");
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}
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}
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return std::error_code();
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}
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template <class ELFT>
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std::error_code
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ELFDumper<ELFT>::dumpSymbol(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
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StringRef StrTable, ELFYAML::Symbol &S) {
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S.Type = Sym->getType();
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S.Value = Sym->st_value;
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S.Size = Sym->st_size;
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S.Other = Sym->st_other;
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Expected<StringRef> SymbolNameOrErr = getSymbolName(Sym, StrTable, SymTab);
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if (!SymbolNameOrErr)
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return errorToErrorCode(SymbolNameOrErr.takeError());
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S.Name = SymbolNameOrErr.get();
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auto ShdrOrErr = Obj.getSection(Sym, SymTab, ShndxTable);
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if (!ShdrOrErr)
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return errorToErrorCode(ShdrOrErr.takeError());
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const Elf_Shdr *Shdr = *ShdrOrErr;
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if (!Shdr)
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return obj2yaml_error::success;
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auto NameOrErr = getUniquedSectionName(Shdr);
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if (!NameOrErr)
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return errorToErrorCode(NameOrErr.takeError());
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S.Section = NameOrErr.get();
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return obj2yaml_error::success;
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}
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template <class ELFT>
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template <class RelT>
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std::error_code ELFDumper<ELFT>::dumpRelocation(const RelT *Rel,
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const Elf_Shdr *SymTab,
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ELFYAML::Relocation &R) {
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R.Type = Rel->getType(Obj.isMips64EL());
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R.Offset = Rel->r_offset;
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R.Addend = 0;
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auto SymOrErr = Obj.getRelocationSymbol(Rel, SymTab);
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if (!SymOrErr)
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return errorToErrorCode(SymOrErr.takeError());
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const Elf_Sym *Sym = *SymOrErr;
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auto StrTabSec = Obj.getSection(SymTab->sh_link);
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if (!StrTabSec)
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return errorToErrorCode(StrTabSec.takeError());
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auto StrTabOrErr = Obj.getStringTable(*StrTabSec);
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if (!StrTabOrErr)
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return errorToErrorCode(StrTabOrErr.takeError());
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StringRef StrTab = *StrTabOrErr;
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if (Sym) {
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Expected<StringRef> NameOrErr = getSymbolName(Sym, StrTab, SymTab);
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if (!NameOrErr)
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return errorToErrorCode(NameOrErr.takeError());
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R.Symbol = NameOrErr.get();
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} else {
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// We have some edge cases of relocations without a symbol associated,
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// e.g. an object containing the invalid (according to the System V
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// ABI) R_X86_64_NONE reloc. Create a symbol with an empty name instead
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// of crashing.
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R.Symbol = "";
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}
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return obj2yaml_error::success;
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}
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template <class ELFT>
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std::error_code ELFDumper<ELFT>::dumpCommonSection(const Elf_Shdr *Shdr,
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ELFYAML::Section &S) {
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S.Type = Shdr->sh_type;
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S.Flags = Shdr->sh_flags;
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S.Address = Shdr->sh_addr;
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S.AddressAlign = Shdr->sh_addralign;
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auto NameOrErr = getUniquedSectionName(Shdr);
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if (!NameOrErr)
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return errorToErrorCode(NameOrErr.takeError());
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S.Name = NameOrErr.get();
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if (Shdr->sh_link != ELF::SHN_UNDEF) {
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auto LinkSection = Obj.getSection(Shdr->sh_link);
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if (LinkSection.takeError())
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return errorToErrorCode(LinkSection.takeError());
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NameOrErr = getUniquedSectionName(*LinkSection);
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if (!NameOrErr)
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return errorToErrorCode(NameOrErr.takeError());
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S.Link = NameOrErr.get();
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}
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return obj2yaml_error::success;
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}
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template <class ELFT>
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std::error_code
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ELFDumper<ELFT>::dumpCommonRelocationSection(const Elf_Shdr *Shdr,
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ELFYAML::RelocationSection &S) {
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if (std::error_code EC = dumpCommonSection(Shdr, S))
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return EC;
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auto InfoSection = Obj.getSection(Shdr->sh_info);
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if (!InfoSection)
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return errorToErrorCode(InfoSection.takeError());
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auto NameOrErr = getUniquedSectionName(*InfoSection);
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if (!NameOrErr)
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return errorToErrorCode(NameOrErr.takeError());
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S.Info = NameOrErr.get();
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return obj2yaml_error::success;
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}
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template <class ELFT>
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ErrorOr<ELFYAML::RelocationSection *>
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ELFDumper<ELFT>::dumpRelSection(const Elf_Shdr *Shdr) {
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assert(Shdr->sh_type == ELF::SHT_REL && "Section type is not SHT_REL");
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auto S = make_unique<ELFYAML::RelocationSection>();
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if (std::error_code EC = dumpCommonRelocationSection(Shdr, *S))
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return EC;
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auto SymTabOrErr = Obj.getSection(Shdr->sh_link);
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if (!SymTabOrErr)
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return errorToErrorCode(SymTabOrErr.takeError());
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const Elf_Shdr *SymTab = *SymTabOrErr;
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auto Rels = Obj.rels(Shdr);
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if (!Rels)
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return errorToErrorCode(Rels.takeError());
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for (const Elf_Rel &Rel : *Rels) {
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ELFYAML::Relocation R;
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if (std::error_code EC = dumpRelocation(&Rel, SymTab, R))
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return EC;
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S->Relocations.push_back(R);
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}
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return S.release();
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}
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template <class ELFT>
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ErrorOr<ELFYAML::RelocationSection *>
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ELFDumper<ELFT>::dumpRelaSection(const Elf_Shdr *Shdr) {
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assert(Shdr->sh_type == ELF::SHT_RELA && "Section type is not SHT_RELA");
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auto S = make_unique<ELFYAML::RelocationSection>();
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if (std::error_code EC = dumpCommonRelocationSection(Shdr, *S))
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return EC;
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auto SymTabOrErr = Obj.getSection(Shdr->sh_link);
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if (!SymTabOrErr)
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return errorToErrorCode(SymTabOrErr.takeError());
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const Elf_Shdr *SymTab = *SymTabOrErr;
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auto Rels = Obj.relas(Shdr);
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if (!Rels)
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return errorToErrorCode(Rels.takeError());
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for (const Elf_Rela &Rel : *Rels) {
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ELFYAML::Relocation R;
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if (std::error_code EC = dumpRelocation(&Rel, SymTab, R))
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return EC;
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R.Addend = Rel.r_addend;
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S->Relocations.push_back(R);
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}
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return S.release();
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}
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template <class ELFT>
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ErrorOr<ELFYAML::RawContentSection *>
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ELFDumper<ELFT>::dumpContentSection(const Elf_Shdr *Shdr) {
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auto S = make_unique<ELFYAML::RawContentSection>();
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if (std::error_code EC = dumpCommonSection(Shdr, *S))
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return EC;
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auto ContentOrErr = Obj.getSectionContents(Shdr);
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if (!ContentOrErr)
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return errorToErrorCode(ContentOrErr.takeError());
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S->Content = yaml::BinaryRef(ContentOrErr.get());
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S->Size = S->Content.binary_size();
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return S.release();
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}
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template <class ELFT>
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ErrorOr<ELFYAML::NoBitsSection *>
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ELFDumper<ELFT>::dumpNoBitsSection(const Elf_Shdr *Shdr) {
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auto S = make_unique<ELFYAML::NoBitsSection>();
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if (std::error_code EC = dumpCommonSection(Shdr, *S))
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return EC;
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S->Size = Shdr->sh_size;
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return S.release();
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}
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template <class ELFT>
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ErrorOr<ELFYAML::Group *> ELFDumper<ELFT>::dumpGroup(const Elf_Shdr *Shdr) {
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auto S = make_unique<ELFYAML::Group>();
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if (std::error_code EC = dumpCommonSection(Shdr, *S))
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return EC;
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// Get sh_info which is the signature.
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auto SymtabOrErr = Obj.getSection(Shdr->sh_link);
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if (!SymtabOrErr)
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return errorToErrorCode(SymtabOrErr.takeError());
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const Elf_Shdr *Symtab = *SymtabOrErr;
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auto SymOrErr = Obj.getSymbol(Symtab, Shdr->sh_info);
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if (!SymOrErr)
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return errorToErrorCode(SymOrErr.takeError());
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const Elf_Sym *symbol = *SymOrErr;
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auto StrTabOrErr = Obj.getStringTableForSymtab(*Symtab);
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if (!StrTabOrErr)
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return errorToErrorCode(StrTabOrErr.takeError());
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StringRef StrTab = *StrTabOrErr;
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auto sectionContents = Obj.getSectionContents(Shdr);
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if (!sectionContents)
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return errorToErrorCode(sectionContents.takeError());
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Expected<StringRef> symbolName = getSymbolName(symbol, StrTab, Symtab);
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if (!symbolName)
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return errorToErrorCode(symbolName.takeError());
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S->Info = *symbolName;
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const Elf_Word *groupMembers =
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reinterpret_cast<const Elf_Word *>(sectionContents->data());
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const long count = (Shdr->sh_size) / sizeof(Elf_Word);
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ELFYAML::SectionOrType s;
|
|
for (int i = 0; i < count; i++) {
|
|
if (groupMembers[i] == llvm::ELF::GRP_COMDAT) {
|
|
s.sectionNameOrType = "GRP_COMDAT";
|
|
} else {
|
|
auto sHdr = Obj.getSection(groupMembers[i]);
|
|
if (!sHdr)
|
|
return errorToErrorCode(sHdr.takeError());
|
|
auto sectionName = getUniquedSectionName(*sHdr);
|
|
if (!sectionName)
|
|
return errorToErrorCode(sectionName.takeError());
|
|
s.sectionNameOrType = *sectionName;
|
|
}
|
|
S->Members.push_back(s);
|
|
}
|
|
return S.release();
|
|
}
|
|
|
|
template <class ELFT>
|
|
ErrorOr<ELFYAML::MipsABIFlags *>
|
|
ELFDumper<ELFT>::dumpMipsABIFlags(const Elf_Shdr *Shdr) {
|
|
assert(Shdr->sh_type == ELF::SHT_MIPS_ABIFLAGS &&
|
|
"Section type is not SHT_MIPS_ABIFLAGS");
|
|
auto S = make_unique<ELFYAML::MipsABIFlags>();
|
|
if (std::error_code EC = dumpCommonSection(Shdr, *S))
|
|
return EC;
|
|
|
|
auto ContentOrErr = Obj.getSectionContents(Shdr);
|
|
if (!ContentOrErr)
|
|
return errorToErrorCode(ContentOrErr.takeError());
|
|
|
|
auto *Flags = reinterpret_cast<const object::Elf_Mips_ABIFlags<ELFT> *>(
|
|
ContentOrErr.get().data());
|
|
S->Version = Flags->version;
|
|
S->ISALevel = Flags->isa_level;
|
|
S->ISARevision = Flags->isa_rev;
|
|
S->GPRSize = Flags->gpr_size;
|
|
S->CPR1Size = Flags->cpr1_size;
|
|
S->CPR2Size = Flags->cpr2_size;
|
|
S->FpABI = Flags->fp_abi;
|
|
S->ISAExtension = Flags->isa_ext;
|
|
S->ASEs = Flags->ases;
|
|
S->Flags1 = Flags->flags1;
|
|
S->Flags2 = Flags->flags2;
|
|
return S.release();
|
|
}
|
|
|
|
template <class ELFT>
|
|
static std::error_code elf2yaml(raw_ostream &Out,
|
|
const object::ELFFile<ELFT> &Obj) {
|
|
ELFDumper<ELFT> Dumper(Obj);
|
|
ErrorOr<ELFYAML::Object *> YAMLOrErr = Dumper.dump();
|
|
if (std::error_code EC = YAMLOrErr.getError())
|
|
return EC;
|
|
|
|
std::unique_ptr<ELFYAML::Object> YAML(YAMLOrErr.get());
|
|
yaml::Output Yout(Out);
|
|
Yout << *YAML;
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code elf2yaml(raw_ostream &Out, const object::ObjectFile &Obj) {
|
|
if (const auto *ELFObj = dyn_cast<object::ELF32LEObjectFile>(&Obj))
|
|
return elf2yaml(Out, *ELFObj->getELFFile());
|
|
|
|
if (const auto *ELFObj = dyn_cast<object::ELF32BEObjectFile>(&Obj))
|
|
return elf2yaml(Out, *ELFObj->getELFFile());
|
|
|
|
if (const auto *ELFObj = dyn_cast<object::ELF64LEObjectFile>(&Obj))
|
|
return elf2yaml(Out, *ELFObj->getELFFile());
|
|
|
|
if (const auto *ELFObj = dyn_cast<object::ELF64BEObjectFile>(&Obj))
|
|
return elf2yaml(Out, *ELFObj->getELFFile());
|
|
|
|
return obj2yaml_error::unsupported_obj_file_format;
|
|
}
|