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351 lines
11 KiB
C++
351 lines
11 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 "obj2yaml.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/Object/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 object::ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
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typedef typename object::ELFFile<ELFT>::Elf_Sym_Iter Elf_Sym_Iter;
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typedef typename object::ELFFile<ELFT>::Elf_Word Elf_Word;
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const object::ELFFile<ELFT> &Obj;
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std::error_code dumpSymbol(Elf_Sym_Iter Sym, 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 Elf_Shdr *Shdr, const RelT *Rel,
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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::Group *> dumpGroup(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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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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// Dump sections
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for (const Elf_Shdr &Sec : Obj.sections()) {
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switch (Sec.sh_type) {
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case ELF::SHT_NULL:
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case ELF::SHT_SYMTAB:
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case ELF::SHT_DYNSYM:
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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_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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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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// Dump symbols
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bool IsFirstSym = true;
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for (auto SI = Obj.begin_symbols(), SE = Obj.end_symbols(); SI != SE; ++SI) {
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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 (std::error_code EC = ELFDumper<ELFT>::dumpSymbol(SI, S))
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return EC;
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switch (SI->getBinding())
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{
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case ELF::STB_LOCAL:
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Y->Symbols.Local.push_back(S);
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break;
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case ELF::STB_GLOBAL:
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Y->Symbols.Global.push_back(S);
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break;
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case ELF::STB_WEAK:
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Y->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 Y.release();
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}
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template <class ELFT>
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std::error_code ELFDumper<ELFT>::dumpSymbol(Elf_Sym_Iter Sym,
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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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ErrorOr<StringRef> NameOrErr = Obj.getSymbolName(Sym);
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if (std::error_code EC = NameOrErr.getError())
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return EC;
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S.Name = NameOrErr.get();
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const Elf_Shdr *Shdr = Obj.getSection(&*Sym);
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if (!Shdr)
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return obj2yaml_error::success;
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NameOrErr = Obj.getSectionName(Shdr);
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if (std::error_code EC = NameOrErr.getError())
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return EC;
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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 Elf_Shdr *Shdr,
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const RelT *Rel,
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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 NamePair = Obj.getRelocationSymbol(Shdr, Rel);
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if (!NamePair.first)
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return obj2yaml_error::success;
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ErrorOr<StringRef> NameOrErr =
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Obj.getSymbolName(NamePair.first, NamePair.second);
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if (std::error_code EC = NameOrErr.getError())
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return EC;
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R.Symbol = 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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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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ErrorOr<StringRef> NameOrErr = Obj.getSectionName(Shdr);
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if (std::error_code EC = NameOrErr.getError())
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return EC;
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S.Name = NameOrErr.get();
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if (Shdr->sh_link != ELF::SHN_UNDEF) {
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if (const Elf_Shdr *LinkSection = Obj.getSection(Shdr->sh_link)) {
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NameOrErr = Obj.getSectionName(LinkSection);
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if (std::error_code EC = NameOrErr.getError())
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return EC;
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S.Link = NameOrErr.get();
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}
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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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if (const Elf_Shdr *InfoSection = Obj.getSection(Shdr->sh_info)) {
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ErrorOr<StringRef> NameOrErr = Obj.getSectionName(InfoSection);
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if (std::error_code EC = NameOrErr.getError())
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return EC;
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S.Info = 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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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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for (auto RI = Obj.begin_rel(Shdr), RE = Obj.end_rel(Shdr); RI != RE;
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++RI) {
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ELFYAML::Relocation R;
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if (std::error_code EC = dumpRelocation(Shdr, &*RI, 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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for (auto RI = Obj.begin_rela(Shdr), RE = Obj.end_rela(Shdr); RI != RE;
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++RI) {
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ELFYAML::Relocation R;
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if (std::error_code EC = dumpRelocation(Shdr, &*RI, R))
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return EC;
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R.Addend = RI->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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ErrorOr<ArrayRef<uint8_t>> ContentOrErr = Obj.getSectionContents(Shdr);
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if (std::error_code EC = ContentOrErr.getError())
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return EC;
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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::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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const Elf_Sym *symbol = Obj.getSymbol(Shdr->sh_info);
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const Elf_Shdr *symtab = Obj.getSection(Shdr->sh_link);
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auto sectionContents = Obj.getSectionContents(Shdr);
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if (std::error_code ec = sectionContents.getError())
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return ec;
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ErrorOr<StringRef> symbolName = Obj.getSymbolName(symtab, symbol);
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if (std::error_code EC = symbolName.getError())
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return EC;
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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;
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for (int i = 0; i < count; i++) {
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if (groupMembers[i] == llvm::ELF::GRP_COMDAT) {
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s.sectionNameOrType = "GRP_COMDAT";
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} else {
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const Elf_Shdr *sHdr = Obj.getSection(groupMembers[i]);
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ErrorOr<StringRef> sectionName = Obj.getSectionName(sHdr);
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if (std::error_code ec = sectionName.getError())
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return ec;
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s.sectionNameOrType = *sectionName;
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}
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S->Members.push_back(s);
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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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static std::error_code elf2yaml(raw_ostream &Out,
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const object::ELFFile<ELFT> &Obj) {
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ELFDumper<ELFT> Dumper(Obj);
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ErrorOr<ELFYAML::Object *> YAMLOrErr = Dumper.dump();
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if (std::error_code EC = YAMLOrErr.getError())
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return EC;
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std::unique_ptr<ELFYAML::Object> YAML(YAMLOrErr.get());
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yaml::Output Yout(Out);
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Yout << *YAML;
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return object::object_error::success;
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}
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std::error_code elf2yaml(raw_ostream &Out, const object::ObjectFile &Obj) {
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if (const auto *ELFObj = dyn_cast<object::ELF32LEObjectFile>(&Obj))
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return elf2yaml(Out, *ELFObj->getELFFile());
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if (const auto *ELFObj = dyn_cast<object::ELF32BEObjectFile>(&Obj))
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return elf2yaml(Out, *ELFObj->getELFFile());
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if (const auto *ELFObj = dyn_cast<object::ELF64LEObjectFile>(&Obj))
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return elf2yaml(Out, *ELFObj->getELFFile());
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if (const auto *ELFObj = dyn_cast<object::ELF64BEObjectFile>(&Obj))
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return elf2yaml(Out, *ELFObj->getELFFile());
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return obj2yaml_error::unsupported_obj_file_format;
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}
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