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ELFDumper.cpp
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ELFDumper.cpp
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//===- ELFDumper.cpp - ELF-specific dumper --------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements the ELF-specific dumper for llvm-readobj.
///
//===----------------------------------------------------------------------===//
#include "ARMEHABIPrinter.h"
#include "DwarfCFIEHPrinter.h"
#include "Error.h"
#include "ObjDumper.h"
#include "StackMapPrinter.h"
#include "llvm-readobj.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/AMDGPUMetadataVerifier.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/Object/ELF.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/ELFTypes.h"
#include "llvm/Object/Error.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/RelocationResolver.h"
#include "llvm/Object/StackMapParser.h"
#include "llvm/Support/AMDGPUMetadata.h"
#include "llvm/Support/ARMAttributeParser.h"
#include "llvm/Support/ARMBuildAttributes.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MipsABIFlags.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cinttypes>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <iterator>
#include <memory>
#include <string>
#include <system_error>
#include <unordered_set>
#include <vector>
using namespace llvm;
using namespace llvm::object;
using namespace ELF;
#define LLVM_READOBJ_ENUM_CASE(ns, enum) \
case ns::enum: \
return #enum;
#define ENUM_ENT(enum, altName) \
{ #enum, altName, ELF::enum }
#define ENUM_ENT_1(enum) \
{ #enum, #enum, ELF::enum }
#define LLVM_READOBJ_PHDR_ENUM(ns, enum) \
case ns::enum: \
return std::string(#enum).substr(3);
#define TYPEDEF_ELF_TYPES(ELFT) \
using ELFO = ELFFile<ELFT>; \
using Elf_Addr = typename ELFT::Addr; \
using Elf_Shdr = typename ELFT::Shdr; \
using Elf_Sym = typename ELFT::Sym; \
using Elf_Dyn = typename ELFT::Dyn; \
using Elf_Dyn_Range = typename ELFT::DynRange; \
using Elf_Rel = typename ELFT::Rel; \
using Elf_Rela = typename ELFT::Rela; \
using Elf_Relr = typename ELFT::Relr; \
using Elf_Rel_Range = typename ELFT::RelRange; \
using Elf_Rela_Range = typename ELFT::RelaRange; \
using Elf_Relr_Range = typename ELFT::RelrRange; \
using Elf_Phdr = typename ELFT::Phdr; \
using Elf_Half = typename ELFT::Half; \
using Elf_Ehdr = typename ELFT::Ehdr; \
using Elf_Word = typename ELFT::Word; \
using Elf_Hash = typename ELFT::Hash; \
using Elf_GnuHash = typename ELFT::GnuHash; \
using Elf_Note = typename ELFT::Note; \
using Elf_Sym_Range = typename ELFT::SymRange; \
using Elf_Versym = typename ELFT::Versym; \
using Elf_Verneed = typename ELFT::Verneed; \
using Elf_Vernaux = typename ELFT::Vernaux; \
using Elf_Verdef = typename ELFT::Verdef; \
using Elf_Verdaux = typename ELFT::Verdaux; \
using Elf_CGProfile = typename ELFT::CGProfile; \
using uintX_t = typename ELFT::uint;
namespace {
template <class ELFT> class DumpStyle;
/// Represents a contiguous uniform range in the file. We cannot just create a
/// range directly because when creating one of these from the .dynamic table
/// the size, entity size and virtual address are different entries in arbitrary
/// order (DT_REL, DT_RELSZ, DT_RELENT for example).
struct DynRegionInfo {
DynRegionInfo(StringRef ObjName) : FileName(ObjName) {}
DynRegionInfo(const void *A, uint64_t S, uint64_t ES, StringRef ObjName)
: Addr(A), Size(S), EntSize(ES), FileName(ObjName) {}
/// Address in current address space.
const void *Addr = nullptr;
/// Size in bytes of the region.
uint64_t Size = 0;
/// Size of each entity in the region.
uint64_t EntSize = 0;
/// Name of the file. Used for error reporting.
StringRef FileName;
template <typename Type> ArrayRef<Type> getAsArrayRef() const {
const Type *Start = reinterpret_cast<const Type *>(Addr);
if (!Start)
return {Start, Start};
if (EntSize != sizeof(Type) || Size % EntSize) {
// TODO: Add a section index to this warning.
reportWarning(createError("invalid section size (" + Twine(Size) +
") or entity size (" + Twine(EntSize) + ")"),
FileName);
return {Start, Start};
}
return {Start, Start + (Size / EntSize)};
}
};
template <typename ELFT> class ELFDumper : public ObjDumper {
public:
ELFDumper(const object::ELFObjectFile<ELFT> *ObjF, ScopedPrinter &Writer);
void printFileHeaders() override;
void printSectionHeaders() override;
void printRelocations() override;
void printDynamicRelocations() override;
void printSymbols(bool PrintSymbols, bool PrintDynamicSymbols) override;
void printHashSymbols() override;
void printUnwindInfo() override;
void printDynamicTable() override;
void printNeededLibraries() override;
void printProgramHeaders(bool PrintProgramHeaders,
cl::boolOrDefault PrintSectionMapping) override;
void printHashTable() override;
void printGnuHashTable() override;
void printLoadName() override;
void printVersionInfo() override;
void printGroupSections() override;
void printArchSpecificInfo() override;
void printStackMap() const override;
void printHashHistogram() override;
void printCGProfile() override;
void printAddrsig() override;
void printNotes() override;
void printELFLinkerOptions() override;
void printStackSizes() override;
const object::ELFObjectFile<ELFT> *getElfObject() const { return ObjF; };
private:
std::unique_ptr<DumpStyle<ELFT>> ELFDumperStyle;
TYPEDEF_ELF_TYPES(ELFT)
DynRegionInfo checkDRI(DynRegionInfo DRI) {
const ELFFile<ELFT> *Obj = ObjF->getELFFile();
if (DRI.Addr < Obj->base() ||
reinterpret_cast<const uint8_t *>(DRI.Addr) + DRI.Size >
Obj->base() + Obj->getBufSize())
reportError(errorCodeToError(llvm::object::object_error::parse_failed),
ObjF->getFileName());
return DRI;
}
DynRegionInfo createDRIFrom(const Elf_Phdr *P, uintX_t EntSize) {
return checkDRI({ObjF->getELFFile()->base() + P->p_offset, P->p_filesz,
EntSize, ObjF->getFileName()});
}
DynRegionInfo createDRIFrom(const Elf_Shdr *S) {
return checkDRI({ObjF->getELFFile()->base() + S->sh_offset, S->sh_size,
S->sh_entsize, ObjF->getFileName()});
}
void printAttributes();
void printMipsReginfo();
void printMipsOptions();
std::pair<const Elf_Phdr *, const Elf_Shdr *>
findDynamic(const ELFFile<ELFT> *Obj);
void loadDynamicTable(const ELFFile<ELFT> *Obj);
void parseDynamicTable();
StringRef getSymbolVersion(StringRef StrTab, const Elf_Sym *symb,
bool &IsDefault) const;
void LoadVersionMap() const;
void LoadVersionNeeds(const Elf_Shdr *ec) const;
void LoadVersionDefs(const Elf_Shdr *sec) const;
const object::ELFObjectFile<ELFT> *ObjF;
DynRegionInfo DynRelRegion;
DynRegionInfo DynRelaRegion;
DynRegionInfo DynRelrRegion;
DynRegionInfo DynPLTRelRegion;
DynRegionInfo DynSymRegion;
DynRegionInfo DynamicTable;
StringRef DynamicStringTable;
std::string SOName = "<Not found>";
const Elf_Hash *HashTable = nullptr;
const Elf_GnuHash *GnuHashTable = nullptr;
const Elf_Shdr *DotSymtabSec = nullptr;
const Elf_Shdr *DotCGProfileSec = nullptr;
const Elf_Shdr *DotAddrsigSec = nullptr;
StringRef DynSymtabName;
ArrayRef<Elf_Word> ShndxTable;
const Elf_Shdr *SymbolVersionSection = nullptr; // .gnu.version
const Elf_Shdr *SymbolVersionNeedSection = nullptr; // .gnu.version_r
const Elf_Shdr *SymbolVersionDefSection = nullptr; // .gnu.version_d
// Records for each version index the corresponding Verdef or Vernaux entry.
// This is filled the first time LoadVersionMap() is called.
class VersionMapEntry : public PointerIntPair<const void *, 1> {
public:
// If the integer is 0, this is an Elf_Verdef*.
// If the integer is 1, this is an Elf_Vernaux*.
VersionMapEntry() : PointerIntPair<const void *, 1>(nullptr, 0) {}
VersionMapEntry(const Elf_Verdef *verdef)
: PointerIntPair<const void *, 1>(verdef, 0) {}
VersionMapEntry(const Elf_Vernaux *vernaux)
: PointerIntPair<const void *, 1>(vernaux, 1) {}
bool isNull() const { return getPointer() == nullptr; }
bool isVerdef() const { return !isNull() && getInt() == 0; }
bool isVernaux() const { return !isNull() && getInt() == 1; }
const Elf_Verdef *getVerdef() const {
return isVerdef() ? (const Elf_Verdef *)getPointer() : nullptr;
}
const Elf_Vernaux *getVernaux() const {
return isVernaux() ? (const Elf_Vernaux *)getPointer() : nullptr;
}
};
mutable SmallVector<VersionMapEntry, 16> VersionMap;
public:
Elf_Dyn_Range dynamic_table() const {
// A valid .dynamic section contains an array of entries terminated
// with a DT_NULL entry. However, sometimes the section content may
// continue past the DT_NULL entry, so to dump the section correctly,
// we first find the end of the entries by iterating over them.
Elf_Dyn_Range Table = DynamicTable.getAsArrayRef<Elf_Dyn>();
size_t Size = 0;
while (Size < Table.size())
if (Table[Size++].getTag() == DT_NULL)
break;
return Table.slice(0, Size);
}
Elf_Sym_Range dynamic_symbols() const {
return DynSymRegion.getAsArrayRef<Elf_Sym>();
}
Elf_Rel_Range dyn_rels() const;
Elf_Rela_Range dyn_relas() const;
Elf_Relr_Range dyn_relrs() const;
std::string getFullSymbolName(const Elf_Sym *Symbol, StringRef StrTable,
bool IsDynamic) const;
void getSectionNameIndex(const Elf_Sym *Symbol, const Elf_Sym *FirstSym,
StringRef &SectionName,
unsigned &SectionIndex) const;
Expected<std::string> getStaticSymbolName(uint32_t Index) const;
std::string getDynamicString(uint64_t Value) const;
StringRef getSymbolVersionByIndex(StringRef StrTab,
uint32_t VersionSymbolIndex,
bool &IsDefault) const;
void printSymbolsHelper(bool IsDynamic) const;
void printDynamicEntry(raw_ostream &OS, uint64_t Type, uint64_t Value) const;
const Elf_Shdr *getDotSymtabSec() const { return DotSymtabSec; }
const Elf_Shdr *getDotCGProfileSec() const { return DotCGProfileSec; }
const Elf_Shdr *getDotAddrsigSec() const { return DotAddrsigSec; }
ArrayRef<Elf_Word> getShndxTable() const { return ShndxTable; }
StringRef getDynamicStringTable() const { return DynamicStringTable; }
const DynRegionInfo &getDynRelRegion() const { return DynRelRegion; }
const DynRegionInfo &getDynRelaRegion() const { return DynRelaRegion; }
const DynRegionInfo &getDynRelrRegion() const { return DynRelrRegion; }
const DynRegionInfo &getDynPLTRelRegion() const { return DynPLTRelRegion; }
const DynRegionInfo &getDynamicTableRegion() const { return DynamicTable; }
const Elf_Hash *getHashTable() const { return HashTable; }
const Elf_GnuHash *getGnuHashTable() const { return GnuHashTable; }
};
template <class ELFT>
void ELFDumper<ELFT>::printSymbolsHelper(bool IsDynamic) const {
StringRef StrTable, SymtabName;
size_t Entries = 0;
Elf_Sym_Range Syms(nullptr, nullptr);
const ELFFile<ELFT> *Obj = ObjF->getELFFile();
if (IsDynamic) {
StrTable = DynamicStringTable;
Syms = dynamic_symbols();
SymtabName = DynSymtabName;
if (DynSymRegion.Addr)
Entries = DynSymRegion.Size / DynSymRegion.EntSize;
} else {
if (!DotSymtabSec)
return;
StrTable = unwrapOrError(ObjF->getFileName(),
Obj->getStringTableForSymtab(*DotSymtabSec));
Syms = unwrapOrError(ObjF->getFileName(), Obj->symbols(DotSymtabSec));
SymtabName =
unwrapOrError(ObjF->getFileName(), Obj->getSectionName(DotSymtabSec));
Entries = DotSymtabSec->getEntityCount();
}
if (Syms.begin() == Syms.end())
return;
// The st_other field has 2 logical parts. The first two bits hold the symbol
// visibility (STV_*) and the remainder hold other platform-specific values.
bool NonVisibilityBitsUsed = llvm::find_if(Syms, [](const Elf_Sym &S) {
return S.st_other & ~0x3;
}) != Syms.end();
ELFDumperStyle->printSymtabMessage(Obj, SymtabName, Entries,
NonVisibilityBitsUsed);
for (const auto &Sym : Syms)
ELFDumperStyle->printSymbol(Obj, &Sym, Syms.begin(), StrTable, IsDynamic,
NonVisibilityBitsUsed);
}
template <class ELFT> class MipsGOTParser;
template <typename ELFT> class DumpStyle {
public:
using Elf_Shdr = typename ELFT::Shdr;
using Elf_Sym = typename ELFT::Sym;
using Elf_Addr = typename ELFT::Addr;
DumpStyle(ELFDumper<ELFT> *Dumper) : Dumper(Dumper) {
FileName = this->Dumper->getElfObject()->getFileName();
// Dumper reports all non-critical errors as warnings.
// It does not print the same warning more than once.
WarningHandler = [this](const Twine &Msg) {
if (Warnings.insert(Msg.str()).second)
reportWarning(createError(Msg), FileName);
return Error::success();
};
}
virtual ~DumpStyle() = default;
virtual void printFileHeaders(const ELFFile<ELFT> *Obj) = 0;
virtual void printGroupSections(const ELFFile<ELFT> *Obj) = 0;
virtual void printRelocations(const ELFFile<ELFT> *Obj) = 0;
virtual void printSectionHeaders(const ELFFile<ELFT> *Obj) = 0;
virtual void printSymbols(const ELFFile<ELFT> *Obj, bool PrintSymbols,
bool PrintDynamicSymbols) = 0;
virtual void printHashSymbols(const ELFFile<ELFT> *Obj) {}
virtual void printDynamic(const ELFFile<ELFT> *Obj) {}
virtual void printDynamicRelocations(const ELFFile<ELFT> *Obj) = 0;
virtual void printSymtabMessage(const ELFFile<ELFT> *Obj, StringRef Name,
size_t Offset, bool NonVisibilityBitsUsed) {}
virtual void printSymbol(const ELFFile<ELFT> *Obj, const Elf_Sym *Symbol,
const Elf_Sym *FirstSym, StringRef StrTable,
bool IsDynamic, bool NonVisibilityBitsUsed) = 0;
virtual void printProgramHeaders(const ELFFile<ELFT> *Obj,
bool PrintProgramHeaders,
cl::boolOrDefault PrintSectionMapping) = 0;
virtual void printVersionSymbolSection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) = 0;
virtual void printVersionDefinitionSection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) = 0;
virtual void printVersionDependencySection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) = 0;
virtual void printHashHistogram(const ELFFile<ELFT> *Obj) = 0;
virtual void printCGProfile(const ELFFile<ELFT> *Obj) = 0;
virtual void printAddrsig(const ELFFile<ELFT> *Obj) = 0;
virtual void printNotes(const ELFFile<ELFT> *Obj) = 0;
virtual void printELFLinkerOptions(const ELFFile<ELFT> *Obj) = 0;
virtual void printStackSizes(const ELFObjectFile<ELFT> *Obj) = 0;
void printNonRelocatableStackSizes(const ELFObjectFile<ELFT> *Obj,
std::function<void()> PrintHeader);
void printRelocatableStackSizes(const ELFObjectFile<ELFT> *Obj,
std::function<void()> PrintHeader);
void printFunctionStackSize(const ELFObjectFile<ELFT> *Obj, uint64_t SymValue,
SectionRef FunctionSec,
const StringRef SectionName, DataExtractor Data,
uint64_t *Offset);
void printStackSize(const ELFObjectFile<ELFT> *Obj, RelocationRef Rel,
SectionRef FunctionSec,
const StringRef &StackSizeSectionName,
const RelocationResolver &Resolver, DataExtractor Data);
virtual void printStackSizeEntry(uint64_t Size, StringRef FuncName) = 0;
virtual void printMipsGOT(const MipsGOTParser<ELFT> &Parser) = 0;
virtual void printMipsPLT(const MipsGOTParser<ELFT> &Parser) = 0;
virtual void printMipsABIFlags(const ELFObjectFile<ELFT> *Obj) = 0;
const ELFDumper<ELFT> *dumper() const { return Dumper; }
protected:
std::function<Error(const Twine &Msg)> WarningHandler;
StringRef FileName;
private:
std::unordered_set<std::string> Warnings;
const ELFDumper<ELFT> *Dumper;
};
template <typename ELFT> class GNUStyle : public DumpStyle<ELFT> {
formatted_raw_ostream &OS;
public:
TYPEDEF_ELF_TYPES(ELFT)
GNUStyle(ScopedPrinter &W, ELFDumper<ELFT> *Dumper)
: DumpStyle<ELFT>(Dumper),
OS(static_cast<formatted_raw_ostream&>(W.getOStream())) {
assert (&W.getOStream() == &llvm::fouts());
}
void printFileHeaders(const ELFO *Obj) override;
void printGroupSections(const ELFFile<ELFT> *Obj) override;
void printRelocations(const ELFO *Obj) override;
void printSectionHeaders(const ELFO *Obj) override;
void printSymbols(const ELFO *Obj, bool PrintSymbols,
bool PrintDynamicSymbols) override;
void printHashSymbols(const ELFO *Obj) override;
void printDynamic(const ELFFile<ELFT> *Obj) override;
void printDynamicRelocations(const ELFO *Obj) override;
void printSymtabMessage(const ELFO *Obj, StringRef Name, size_t Offset,
bool NonVisibilityBitsUsed) override;
void printProgramHeaders(const ELFO *Obj, bool PrintProgramHeaders,
cl::boolOrDefault PrintSectionMapping) override;
void printVersionSymbolSection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) override;
void printVersionDefinitionSection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) override;
void printVersionDependencySection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) override;
void printHashHistogram(const ELFFile<ELFT> *Obj) override;
void printCGProfile(const ELFFile<ELFT> *Obj) override;
void printAddrsig(const ELFFile<ELFT> *Obj) override;
void printNotes(const ELFFile<ELFT> *Obj) override;
void printELFLinkerOptions(const ELFFile<ELFT> *Obj) override;
void printStackSizes(const ELFObjectFile<ELFT> *Obj) override;
void printStackSizeEntry(uint64_t Size, StringRef FuncName) override;
void printMipsGOT(const MipsGOTParser<ELFT> &Parser) override;
void printMipsPLT(const MipsGOTParser<ELFT> &Parser) override;
void printMipsABIFlags(const ELFObjectFile<ELFT> *Obj) override;
private:
struct Field {
std::string Str;
unsigned Column;
Field(StringRef S, unsigned Col) : Str(S), Column(Col) {}
Field(unsigned Col) : Column(Col) {}
};
template <typename T, typename TEnum>
std::string printEnum(T Value, ArrayRef<EnumEntry<TEnum>> EnumValues) {
for (const auto &EnumItem : EnumValues)
if (EnumItem.Value == Value)
return EnumItem.AltName;
return to_hexString(Value, false);
}
template <typename T, typename TEnum>
std::string printFlags(T Value, ArrayRef<EnumEntry<TEnum>> EnumValues,
TEnum EnumMask1 = {}, TEnum EnumMask2 = {},
TEnum EnumMask3 = {}) {
std::string Str;
for (const auto &Flag : EnumValues) {
if (Flag.Value == 0)
continue;
TEnum EnumMask{};
if (Flag.Value & EnumMask1)
EnumMask = EnumMask1;
else if (Flag.Value & EnumMask2)
EnumMask = EnumMask2;
else if (Flag.Value & EnumMask3)
EnumMask = EnumMask3;
bool IsEnum = (Flag.Value & EnumMask) != 0;
if ((!IsEnum && (Value & Flag.Value) == Flag.Value) ||
(IsEnum && (Value & EnumMask) == Flag.Value)) {
if (!Str.empty())
Str += ", ";
Str += Flag.AltName;
}
}
return Str;
}
formatted_raw_ostream &printField(struct Field F) {
if (F.Column != 0)
OS.PadToColumn(F.Column);
OS << F.Str;
OS.flush();
return OS;
}
void printHashedSymbol(const ELFO *Obj, const Elf_Sym *FirstSym, uint32_t Sym,
StringRef StrTable, uint32_t Bucket);
void printRelocHeader(unsigned SType);
void printRelocation(const ELFO *Obj, const Elf_Shdr *SymTab,
const Elf_Rela &R, bool IsRela);
void printRelocation(const ELFO *Obj, const Elf_Sym *Sym,
StringRef SymbolName, const Elf_Rela &R, bool IsRela);
void printSymbol(const ELFO *Obj, const Elf_Sym *Symbol, const Elf_Sym *First,
StringRef StrTable, bool IsDynamic,
bool NonVisibilityBitsUsed) override;
std::string getSymbolSectionNdx(const ELFO *Obj, const Elf_Sym *Symbol,
const Elf_Sym *FirstSym);
void printDynamicRelocation(const ELFO *Obj, Elf_Rela R, bool IsRela);
bool checkTLSSections(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
bool checkoffsets(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
bool checkVMA(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
bool checkPTDynamic(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
void printProgramHeaders(const ELFO *Obj);
void printSectionMapping(const ELFO *Obj);
};
template <typename ELFT> class LLVMStyle : public DumpStyle<ELFT> {
public:
TYPEDEF_ELF_TYPES(ELFT)
LLVMStyle(ScopedPrinter &W, ELFDumper<ELFT> *Dumper)
: DumpStyle<ELFT>(Dumper), W(W) {}
void printFileHeaders(const ELFO *Obj) override;
void printGroupSections(const ELFFile<ELFT> *Obj) override;
void printRelocations(const ELFO *Obj) override;
void printRelocations(const Elf_Shdr *Sec, const ELFO *Obj);
void printSectionHeaders(const ELFO *Obj) override;
void printSymbols(const ELFO *Obj, bool PrintSymbols,
bool PrintDynamicSymbols) override;
void printDynamic(const ELFFile<ELFT> *Obj) override;
void printDynamicRelocations(const ELFO *Obj) override;
void printProgramHeaders(const ELFO *Obj, bool PrintProgramHeaders,
cl::boolOrDefault PrintSectionMapping) override;
void printVersionSymbolSection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) override;
void printVersionDefinitionSection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) override;
void printVersionDependencySection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) override;
void printHashHistogram(const ELFFile<ELFT> *Obj) override;
void printCGProfile(const ELFFile<ELFT> *Obj) override;
void printAddrsig(const ELFFile<ELFT> *Obj) override;
void printNotes(const ELFFile<ELFT> *Obj) override;
void printELFLinkerOptions(const ELFFile<ELFT> *Obj) override;
void printStackSizes(const ELFObjectFile<ELFT> *Obj) override;
void printStackSizeEntry(uint64_t Size, StringRef FuncName) override;
void printMipsGOT(const MipsGOTParser<ELFT> &Parser) override;
void printMipsPLT(const MipsGOTParser<ELFT> &Parser) override;
void printMipsABIFlags(const ELFObjectFile<ELFT> *Obj) override;
private:
void printRelocation(const ELFO *Obj, Elf_Rela Rel, const Elf_Shdr *SymTab);
void printDynamicRelocation(const ELFO *Obj, Elf_Rela Rel);
void printSymbols(const ELFO *Obj);
void printDynamicSymbols(const ELFO *Obj);
void printSymbol(const ELFO *Obj, const Elf_Sym *Symbol, const Elf_Sym *First,
StringRef StrTable, bool IsDynamic,
bool /*NonVisibilityBitsUsed*/) override;
void printProgramHeaders(const ELFO *Obj);
void printSectionMapping(const ELFO *Obj) {}
ScopedPrinter &W;
};
} // end anonymous namespace
namespace llvm {
template <class ELFT>
static std::error_code createELFDumper(const ELFObjectFile<ELFT> *Obj,
ScopedPrinter &Writer,
std::unique_ptr<ObjDumper> &Result) {
Result.reset(new ELFDumper<ELFT>(Obj, Writer));
return readobj_error::success;
}
std::error_code createELFDumper(const object::ObjectFile *Obj,
ScopedPrinter &Writer,
std::unique_ptr<ObjDumper> &Result) {
// Little-endian 32-bit
if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
return createELFDumper(ELFObj, Writer, Result);
// Big-endian 32-bit
if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
return createELFDumper(ELFObj, Writer, Result);
// Little-endian 64-bit
if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
return createELFDumper(ELFObj, Writer, Result);
// Big-endian 64-bit
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
return createELFDumper(ELFObj, Writer, Result);
return readobj_error::unsupported_obj_file_format;
}
} // end namespace llvm
// Iterate through the versions needed section, and place each Elf_Vernaux
// in the VersionMap according to its index.
template <class ELFT>
void ELFDumper<ELFT>::LoadVersionNeeds(const Elf_Shdr *Sec) const {
unsigned VerneedSize = Sec->sh_size; // Size of section in bytes
unsigned VerneedEntries = Sec->sh_info; // Number of Verneed entries
const uint8_t *VerneedStart = reinterpret_cast<const uint8_t *>(
ObjF->getELFFile()->base() + Sec->sh_offset);
const uint8_t *VerneedEnd = VerneedStart + VerneedSize;
// The first Verneed entry is at the start of the section.
const uint8_t *VerneedBuf = VerneedStart;
for (unsigned VerneedIndex = 0; VerneedIndex < VerneedEntries;
++VerneedIndex) {
if (VerneedBuf + sizeof(Elf_Verneed) > VerneedEnd)
report_fatal_error("Section ended unexpectedly while scanning "
"version needed records.");
const Elf_Verneed *Verneed =
reinterpret_cast<const Elf_Verneed *>(VerneedBuf);
if (Verneed->vn_version != ELF::VER_NEED_CURRENT)
report_fatal_error("Unexpected verneed version");
// Iterate through the Vernaux entries
const uint8_t *VernauxBuf = VerneedBuf + Verneed->vn_aux;
for (unsigned VernauxIndex = 0; VernauxIndex < Verneed->vn_cnt;
++VernauxIndex) {
if (VernauxBuf + sizeof(Elf_Vernaux) > VerneedEnd)
report_fatal_error("Section ended unexpected while scanning auxiliary "
"version needed records.");
const Elf_Vernaux *Vernaux =
reinterpret_cast<const Elf_Vernaux *>(VernauxBuf);
size_t Index = Vernaux->vna_other & ELF::VERSYM_VERSION;
if (Index >= VersionMap.size())
VersionMap.resize(Index + 1);
VersionMap[Index] = VersionMapEntry(Vernaux);
VernauxBuf += Vernaux->vna_next;
}
VerneedBuf += Verneed->vn_next;
}
}
// Iterate through the version definitions, and place each Elf_Verdef
// in the VersionMap according to its index.
template <class ELFT>
void ELFDumper<ELFT>::LoadVersionDefs(const Elf_Shdr *Sec) const {
unsigned VerdefSize = Sec->sh_size; // Size of section in bytes
unsigned VerdefEntries = Sec->sh_info; // Number of Verdef entries
const uint8_t *VerdefStart = reinterpret_cast<const uint8_t *>(
ObjF->getELFFile()->base() + Sec->sh_offset);
const uint8_t *VerdefEnd = VerdefStart + VerdefSize;
// The first Verdef entry is at the start of the section.
const uint8_t *VerdefBuf = VerdefStart;
for (unsigned VerdefIndex = 0; VerdefIndex < VerdefEntries; ++VerdefIndex) {
if (VerdefBuf + sizeof(Elf_Verdef) > VerdefEnd)
report_fatal_error("Section ended unexpectedly while scanning "
"version definitions.");
const Elf_Verdef *Verdef = reinterpret_cast<const Elf_Verdef *>(VerdefBuf);
if (Verdef->vd_version != ELF::VER_DEF_CURRENT)
report_fatal_error("Unexpected verdef version");
size_t Index = Verdef->vd_ndx & ELF::VERSYM_VERSION;
if (Index >= VersionMap.size())
VersionMap.resize(Index + 1);
VersionMap[Index] = VersionMapEntry(Verdef);
VerdefBuf += Verdef->vd_next;
}
}
template <class ELFT> void ELFDumper<ELFT>::LoadVersionMap() const {
// If there is no dynamic symtab or version table, there is nothing to do.
if (!DynSymRegion.Addr || !SymbolVersionSection)
return;
// Has the VersionMap already been loaded?
if (!VersionMap.empty())
return;
// The first two version indexes are reserved.
// Index 0 is LOCAL, index 1 is GLOBAL.
VersionMap.push_back(VersionMapEntry());
VersionMap.push_back(VersionMapEntry());
if (SymbolVersionDefSection)
LoadVersionDefs(SymbolVersionDefSection);
if (SymbolVersionNeedSection)
LoadVersionNeeds(SymbolVersionNeedSection);
}
template <typename ELFT>
StringRef ELFDumper<ELFT>::getSymbolVersion(StringRef StrTab,
const Elf_Sym *Sym,
bool &IsDefault) const {
// This is a dynamic symbol. Look in the GNU symbol version table.
if (!SymbolVersionSection) {
// No version table.
IsDefault = false;
return "";
}
// Determine the position in the symbol table of this entry.
size_t EntryIndex = (reinterpret_cast<uintptr_t>(Sym) -
reinterpret_cast<uintptr_t>(DynSymRegion.Addr)) /
sizeof(Elf_Sym);
// Get the corresponding version index entry.
const Elf_Versym *Versym = unwrapOrError(
ObjF->getFileName(), ObjF->getELFFile()->template getEntry<Elf_Versym>(
SymbolVersionSection, EntryIndex));
return this->getSymbolVersionByIndex(StrTab, Versym->vs_index, IsDefault);
}
static std::string maybeDemangle(StringRef Name) {
return opts::Demangle ? demangle(Name) : Name.str();
}
template <typename ELFT>
Expected<std::string>
ELFDumper<ELFT>::getStaticSymbolName(uint32_t Index) const {
const ELFFile<ELFT> *Obj = ObjF->getELFFile();
Expected<const typename ELFT::Sym *> SymOrErr =
Obj->getSymbol(DotSymtabSec, Index);
if (!SymOrErr)
return SymOrErr.takeError();
Expected<StringRef> StrTabOrErr = Obj->getStringTableForSymtab(*DotSymtabSec);
if (!StrTabOrErr)
return StrTabOrErr.takeError();
Expected<StringRef> NameOrErr = (*SymOrErr)->getName(*StrTabOrErr);
if (!NameOrErr)
return NameOrErr.takeError();
return maybeDemangle(*NameOrErr);
}
template <typename ELFT>
StringRef ELFDumper<ELFT>::getSymbolVersionByIndex(StringRef StrTab,
uint32_t SymbolVersionIndex,
bool &IsDefault) const {
size_t VersionIndex = SymbolVersionIndex & VERSYM_VERSION;
// Special markers for unversioned symbols.
if (VersionIndex == VER_NDX_LOCAL || VersionIndex == VER_NDX_GLOBAL) {
IsDefault = false;
return "";
}
// Lookup this symbol in the version table.
LoadVersionMap();
if (VersionIndex >= VersionMap.size() || VersionMap[VersionIndex].isNull())
reportError(createError("Invalid version entry"), ObjF->getFileName());
const VersionMapEntry &Entry = VersionMap[VersionIndex];
// Get the version name string.
size_t NameOffset;
if (Entry.isVerdef()) {
// The first Verdaux entry holds the name.
NameOffset = Entry.getVerdef()->getAux()->vda_name;
IsDefault = !(SymbolVersionIndex & VERSYM_HIDDEN);
} else {
NameOffset = Entry.getVernaux()->vna_name;
IsDefault = false;
}
if (NameOffset >= StrTab.size())
reportError(createError("Invalid string offset"), ObjF->getFileName());
return StrTab.data() + NameOffset;
}
template <typename ELFT>
std::string ELFDumper<ELFT>::getFullSymbolName(const Elf_Sym *Symbol,
StringRef StrTable,
bool IsDynamic) const {
std::string SymbolName = maybeDemangle(
unwrapOrError(ObjF->getFileName(), Symbol->getName(StrTable)));
if (SymbolName.empty() && Symbol->getType() == ELF::STT_SECTION) {
unsigned SectionIndex;
StringRef SectionName;
Elf_Sym_Range Syms = unwrapOrError(
ObjF->getFileName(), ObjF->getELFFile()->symbols(DotSymtabSec));
getSectionNameIndex(Symbol, Syms.begin(), SectionName, SectionIndex);
return SectionName;
}
if (!IsDynamic)
return SymbolName;
bool IsDefault;
StringRef Version = getSymbolVersion(StrTable, &*Symbol, IsDefault);
if (!Version.empty()) {
SymbolName += (IsDefault ? "@@" : "@");
SymbolName += Version;
}
return SymbolName;
}
template <typename ELFT>
void ELFDumper<ELFT>::getSectionNameIndex(const Elf_Sym *Symbol,
const Elf_Sym *FirstSym,
StringRef &SectionName,
unsigned &SectionIndex) const {
SectionIndex = Symbol->st_shndx;
if (Symbol->isUndefined())
SectionName = "Undefined";
else if (Symbol->isProcessorSpecific())
SectionName = "Processor Specific";
else if (Symbol->isOSSpecific())
SectionName = "Operating System Specific";
else if (Symbol->isAbsolute())
SectionName = "Absolute";
else if (Symbol->isCommon())
SectionName = "Common";
else if (Symbol->isReserved() && SectionIndex != SHN_XINDEX)
SectionName = "Reserved";
else {
if (SectionIndex == SHN_XINDEX)
SectionIndex = unwrapOrError(ObjF->getFileName(),
object::getExtendedSymbolTableIndex<ELFT>(
Symbol, FirstSym, ShndxTable));
const ELFFile<ELFT> *Obj = ObjF->getELFFile();
const typename ELFT::Shdr *Sec =
unwrapOrError(ObjF->getFileName(), Obj->getSection(SectionIndex));
SectionName = unwrapOrError(ObjF->getFileName(), Obj->getSectionName(Sec));
}
}
template <class ELFO>
static const typename ELFO::Elf_Shdr *
findNotEmptySectionByAddress(const ELFO *Obj, StringRef FileName,
uint64_t Addr) {
for (const auto &Shdr : unwrapOrError(FileName, Obj->sections()))
if (Shdr.sh_addr == Addr && Shdr.sh_size > 0)
return &Shdr;
return nullptr;
}
template <class ELFO>
static const typename ELFO::Elf_Shdr *
findSectionByName(const ELFO &Obj, StringRef FileName, StringRef Name) {
for (const auto &Shdr : unwrapOrError(FileName, Obj.sections()))
if (Name == unwrapOrError(FileName, Obj.getSectionName(&Shdr)))
return &Shdr;
return nullptr;
}
static const EnumEntry<unsigned> ElfClass[] = {
{"None", "none", ELF::ELFCLASSNONE},
{"32-bit", "ELF32", ELF::ELFCLASS32},
{"64-bit", "ELF64", ELF::ELFCLASS64},
};
static const EnumEntry<unsigned> ElfDataEncoding[] = {
{"None", "none", ELF::ELFDATANONE},
{"LittleEndian", "2's complement, little endian", ELF::ELFDATA2LSB},
{"BigEndian", "2's complement, big endian", ELF::ELFDATA2MSB},
};
static const EnumEntry<unsigned> ElfObjectFileType[] = {
{"None", "NONE (none)", ELF::ET_NONE},
{"Relocatable", "REL (Relocatable file)", ELF::ET_REL},
{"Executable", "EXEC (Executable file)", ELF::ET_EXEC},
{"SharedObject", "DYN (Shared object file)", ELF::ET_DYN},
{"Core", "CORE (Core file)", ELF::ET_CORE},
};
static const EnumEntry<unsigned> ElfOSABI[] = {
{"SystemV", "UNIX - System V", ELF::ELFOSABI_NONE},
{"HPUX", "UNIX - HP-UX", ELF::ELFOSABI_HPUX},
{"NetBSD", "UNIX - NetBSD", ELF::ELFOSABI_NETBSD},
{"GNU/Linux", "UNIX - GNU", ELF::ELFOSABI_LINUX},
{"GNU/Hurd", "GNU/Hurd", ELF::ELFOSABI_HURD},
{"Solaris", "UNIX - Solaris", ELF::ELFOSABI_SOLARIS},
{"AIX", "UNIX - AIX", ELF::ELFOSABI_AIX},
{"IRIX", "UNIX - IRIX", ELF::ELFOSABI_IRIX},
{"FreeBSD", "UNIX - FreeBSD", ELF::ELFOSABI_FREEBSD},
{"TRU64", "UNIX - TRU64", ELF::ELFOSABI_TRU64},
{"Modesto", "Novell - Modesto", ELF::ELFOSABI_MODESTO},
{"OpenBSD", "UNIX - OpenBSD", ELF::ELFOSABI_OPENBSD},
{"OpenVMS", "VMS - OpenVMS", ELF::ELFOSABI_OPENVMS},
{"NSK", "HP - Non-Stop Kernel", ELF::ELFOSABI_NSK},
{"AROS", "AROS", ELF::ELFOSABI_AROS},
{"FenixOS", "FenixOS", ELF::ELFOSABI_FENIXOS},
{"CloudABI", "CloudABI", ELF::ELFOSABI_CLOUDABI},
{"Standalone", "Standalone App", ELF::ELFOSABI_STANDALONE}
};
static const EnumEntry<unsigned> SymVersionFlags[] = {
{"Base", "BASE", VER_FLG_BASE},
{"Weak", "WEAK", VER_FLG_WEAK},
{"Info", "INFO", VER_FLG_INFO}};
static const EnumEntry<unsigned> AMDGPUElfOSABI[] = {
{"AMDGPU_HSA", "AMDGPU - HSA", ELF::ELFOSABI_AMDGPU_HSA},
{"AMDGPU_PAL", "AMDGPU - PAL", ELF::ELFOSABI_AMDGPU_PAL},
{"AMDGPU_MESA3D", "AMDGPU - MESA3D", ELF::ELFOSABI_AMDGPU_MESA3D}
};
static const EnumEntry<unsigned> ARMElfOSABI[] = {
{"ARM", "ARM", ELF::ELFOSABI_ARM}
};
static const EnumEntry<unsigned> C6000ElfOSABI[] = {
{"C6000_ELFABI", "Bare-metal C6000", ELF::ELFOSABI_C6000_ELFABI},
{"C6000_LINUX", "Linux C6000", ELF::ELFOSABI_C6000_LINUX}
};
static const EnumEntry<unsigned> ElfMachineType[] = {
ENUM_ENT(EM_NONE, "None"),
ENUM_ENT(EM_M32, "WE32100"),
ENUM_ENT(EM_SPARC, "Sparc"),
ENUM_ENT(EM_386, "Intel 80386"),
ENUM_ENT(EM_68K, "MC68000"),
ENUM_ENT(EM_88K, "MC88000"),
ENUM_ENT(EM_IAMCU, "EM_IAMCU"),
ENUM_ENT(EM_860, "Intel 80860"),
ENUM_ENT(EM_MIPS, "MIPS R3000"),
ENUM_ENT(EM_S370, "IBM System/370"),
ENUM_ENT(EM_MIPS_RS3_LE, "MIPS R3000 little-endian"),
ENUM_ENT(EM_PARISC, "HPPA"),
ENUM_ENT(EM_VPP500, "Fujitsu VPP500"),
ENUM_ENT(EM_SPARC32PLUS, "Sparc v8+"),
ENUM_ENT(EM_960, "Intel 80960"),
ENUM_ENT(EM_PPC, "PowerPC"),
ENUM_ENT(EM_PPC64, "PowerPC64"),
ENUM_ENT(EM_S390, "IBM S/390"),
ENUM_ENT(EM_SPU, "SPU"),
ENUM_ENT(EM_V800, "NEC V800 series"),
ENUM_ENT(EM_FR20, "Fujistsu FR20"),
ENUM_ENT(EM_RH32, "TRW RH-32"),
ENUM_ENT(EM_RCE, "Motorola RCE"),
ENUM_ENT(EM_ARM, "ARM"),
ENUM_ENT(EM_ALPHA, "EM_ALPHA"),
ENUM_ENT(EM_SH, "Hitachi SH"),
ENUM_ENT(EM_SPARCV9, "Sparc v9"),
ENUM_ENT(EM_TRICORE, "Siemens Tricore"),
ENUM_ENT(EM_ARC, "ARC"),
ENUM_ENT(EM_H8_300, "Hitachi H8/300"),
ENUM_ENT(EM_H8_300H, "Hitachi H8/300H"),
ENUM_ENT(EM_H8S, "Hitachi H8S"),
ENUM_ENT(EM_H8_500, "Hitachi H8/500"),
ENUM_ENT(EM_IA_64, "Intel IA-64"),
ENUM_ENT(EM_MIPS_X, "Stanford MIPS-X"),
ENUM_ENT(EM_COLDFIRE, "Motorola Coldfire"),
ENUM_ENT(EM_68HC12, "Motorola MC68HC12 Microcontroller"),
ENUM_ENT(EM_MMA, "Fujitsu Multimedia Accelerator"),
ENUM_ENT(EM_PCP, "Siemens PCP"),
ENUM_ENT(EM_NCPU, "Sony nCPU embedded RISC processor"),
ENUM_ENT(EM_NDR1, "Denso NDR1 microprocesspr"),
ENUM_ENT(EM_STARCORE, "Motorola Star*Core processor"),
ENUM_ENT(EM_ME16, "Toyota ME16 processor"),
ENUM_ENT(EM_ST100, "STMicroelectronics ST100 processor"),
ENUM_ENT(EM_TINYJ, "Advanced Logic Corp. TinyJ embedded processor"),
ENUM_ENT(EM_X86_64, "Advanced Micro Devices X86-64"),
ENUM_ENT(EM_PDSP, "Sony DSP processor"),
ENUM_ENT(EM_PDP10, "Digital Equipment Corp. PDP-10"),
ENUM_ENT(EM_PDP11, "Digital Equipment Corp. PDP-11"),
ENUM_ENT(EM_FX66, "Siemens FX66 microcontroller"),
ENUM_ENT(EM_ST9PLUS, "STMicroelectronics ST9+ 8/16 bit microcontroller"),
ENUM_ENT(EM_ST7, "STMicroelectronics ST7 8-bit microcontroller"),
ENUM_ENT(EM_68HC16, "Motorola MC68HC16 Microcontroller"),
ENUM_ENT(EM_68HC11, "Motorola MC68HC11 Microcontroller"),