X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FELFObjectWriter.cpp;h=8918097d3d3b1c27c15b564f4f1bdc2bc514fe39;hb=bce877c84c19efbff64500c227afd40087276070;hp=7488b1b6c2a634959b94c1a31d07f20cc3d41fd6;hpb=78c1e1781cf36dd19988047eac8f664873d35237;p=oota-llvm.git diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp index 7488b1b6c2a..e4442e10a05 100644 --- a/lib/MC/ELFObjectWriter.cpp +++ b/lib/MC/ELFObjectWriter.cpp @@ -1,4 +1,4 @@ -//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -------------------===// +//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -----------------------===// // // The LLVM Compiler Infrastructure // @@ -11,53 +11,106 @@ // //===----------------------------------------------------------------------===// -#include "MCELF.h" -#include "llvm/ADT/OwningPtr.h" -#include "llvm/ADT/SmallPtrSet.h" +#include "llvm/MC/MCELFObjectWriter.h" #include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/SmallPtrSet.h" +#include "llvm/ADT/SmallString.h" #include "llvm/ADT/StringMap.h" -#include "llvm/ADT/Twine.h" -#include "llvm/MC/MCAssembler.h" +#include "llvm/MC/MCAsmBackend.h" +#include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCAsmLayout.h" +#include "llvm/MC/MCAssembler.h" #include "llvm/MC/MCContext.h" +#include "llvm/MC/MCELF.h" #include "llvm/MC/MCELFSymbolFlags.h" #include "llvm/MC/MCExpr.h" -#include "llvm/MC/MCELFObjectWriter.h" +#include "llvm/MC/MCFixupKindInfo.h" #include "llvm/MC/MCObjectWriter.h" #include "llvm/MC/MCSectionELF.h" -#include "llvm/MC/MCSymbol.h" #include "llvm/MC/MCValue.h" +#include "llvm/MC/StringTableBuilder.h" +#include "llvm/Support/Compression.h" #include "llvm/Support/Debug.h" -#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/Endian.h" #include "llvm/Support/ELF.h" -#include "llvm/Target/TargetAsmBackend.h" -#include "llvm/ADT/StringSwitch.h" - -#include "../Target/X86/X86FixupKinds.h" -#include "../Target/ARM/ARMFixupKinds.h" - +#include "llvm/Support/ErrorHandling.h" #include using namespace llvm; +#undef DEBUG_TYPE +#define DEBUG_TYPE "reloc-info" + namespace { - class ELFObjectWriter : public MCObjectWriter { +class FragmentWriter { + bool IsLittleEndian; + +public: + FragmentWriter(bool IsLittleEndian); + template void write(MCDataFragment &F, T Val); +}; + +typedef DenseMap SectionIndexMapTy; + +class SymbolTableWriter { + MCAssembler &Asm; + FragmentWriter &FWriter; + bool Is64Bit; + SectionIndexMapTy &SectionIndexMap; + + // The symbol .symtab fragment we are writting to. + MCDataFragment *SymtabF; + + // .symtab_shndx fragment we are writting to. + MCDataFragment *ShndxF; + + // The numbel of symbols written so far. + unsigned NumWritten; + + void createSymtabShndx(); + + template void write(MCDataFragment &F, T Value); + +public: + SymbolTableWriter(MCAssembler &Asm, FragmentWriter &FWriter, bool Is64Bit, + SectionIndexMapTy &SectionIndexMap, + MCDataFragment *SymtabF); + + void writeSymbol(uint32_t name, uint8_t info, uint64_t value, uint64_t size, + uint8_t other, uint32_t shndx, bool Reserved); +}; + +struct ELFRelocationEntry { + uint64_t Offset; // Where is the relocation. + const MCSymbol *Symbol; // The symbol to relocate with. + unsigned Type; // The type of the relocation. + uint64_t Addend; // The addend to use. + + ELFRelocationEntry(uint64_t Offset, const MCSymbol *Symbol, unsigned Type, + uint64_t Addend) + : Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend) {} +}; + +class ELFObjectWriter : public MCObjectWriter { + FragmentWriter FWriter; + protected: static bool isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind); static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant); static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout); - static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, + static bool isInSymtab(const MCAsmLayout &Layout, const MCSymbolData &Data, bool Used, bool Renamed); - static bool isLocal(const MCSymbolData &Data, bool isSignature, - bool isUsedInReloc); + static bool isLocal(const MCSymbolData &Data, bool isUsedInReloc); static bool IsELFMetaDataSection(const MCSectionData &SD); static uint64_t DataSectionSize(const MCSectionData &SD); static uint64_t GetSectionFileSize(const MCAsmLayout &Layout, const MCSectionData &SD); static uint64_t GetSectionAddressSize(const MCAsmLayout &Layout, const MCSectionData &SD); - static void WriteDataSectionData(ELFObjectWriter *W, - const MCSectionData &SD); + + void WriteDataSectionData(MCAssembler &Asm, + const MCAsmLayout &Layout, + const MCSectionELF &Section); /*static bool isFixupKindX86RIPRel(unsigned Kind) { return Kind == X86::reloc_riprel_4byte || @@ -70,60 +123,39 @@ namespace { MCSymbolData *SymbolData; uint64_t StringIndex; uint32_t SectionIndex; + StringRef Name; // Support lexicographic sorting. bool operator<(const ELFSymbolData &RHS) const { - if (MCELF::GetType(*SymbolData) == ELF::STT_FILE) - return true; - if (MCELF::GetType(*RHS.SymbolData) == ELF::STT_FILE) + unsigned LHSType = MCELF::GetType(*SymbolData); + unsigned RHSType = MCELF::GetType(*RHS.SymbolData); + if (LHSType == ELF::STT_SECTION && RHSType != ELF::STT_SECTION) return false; - return SymbolData->getSymbol().getName() < - RHS.SymbolData->getSymbol().getName(); - } - }; - - /// @name Relocation Data - /// @{ - - struct ELFRelocationEntry { - // Make these big enough for both 32-bit and 64-bit - uint64_t r_offset; - int Index; - unsigned Type; - const MCSymbol *Symbol; - uint64_t r_addend; - - ELFRelocationEntry() - : r_offset(0), Index(0), Type(0), Symbol(0), r_addend(0) {} - - ELFRelocationEntry(uint64_t RelocOffset, int Idx, - unsigned RelType, const MCSymbol *Sym, - uint64_t Addend) - : r_offset(RelocOffset), Index(Idx), Type(RelType), - Symbol(Sym), r_addend(Addend) {} - - // Support lexicographic sorting. - bool operator<(const ELFRelocationEntry &RE) const { - return RE.r_offset < r_offset; + if (LHSType != ELF::STT_SECTION && RHSType == ELF::STT_SECTION) + return true; + if (LHSType == ELF::STT_SECTION && RHSType == ELF::STT_SECTION) + return SectionIndex < RHS.SectionIndex; + return Name < RHS.Name; } }; /// The target specific ELF writer instance. - llvm::OwningPtr TargetObjectWriter; + std::unique_ptr TargetObjectWriter; SmallPtrSet UsedInReloc; SmallPtrSet WeakrefUsedInReloc; DenseMap Renames; - llvm::DenseMap > Relocations; - DenseMap SectionStringTableIndex; + llvm::DenseMap> + Relocations; + StringTableBuilder ShStrTabBuilder; /// @} /// @name Symbol Table Data /// @{ - SmallString<256> StringTable; + StringTableBuilder StrTabBuilder; + std::vector FileSymbolData; std::vector LocalSymbolData; std::vector ExternalSymbolData; std::vector UndefinedSymbolData; @@ -132,8 +164,6 @@ namespace { bool NeedsGOT; - bool NeedsSymtabShndx; - // This holds the symbol table index of the last local symbol. unsigned LastLocalSymbolIndex; // This holds the .strtab section index. @@ -144,30 +174,21 @@ namespace { unsigned ShstrtabIndex; - const MCSymbol *SymbolToReloc(const MCAssembler &Asm, - const MCValue &Target, - const MCFragment &F) const; - - // For arch-specific emission of explicit reloc symbol - virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm, - const MCValue &Target, - const MCFragment &F, - bool IsBSS) const { - return NULL; - } - + // TargetObjectWriter wrappers. bool is64Bit() const { return TargetObjectWriter->is64Bit(); } bool hasRelocationAddend() const { return TargetObjectWriter->hasRelocationAddend(); } + unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, + bool IsPCRel) const { + return TargetObjectWriter->GetRelocType(Target, Fixup, IsPCRel); + } public: - ELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, bool IsLittleEndian) - : MCObjectWriter(_OS, IsLittleEndian), - TargetObjectWriter(MOTW), - NeedsGOT(false), NeedsSymtabShndx(false){ - } + ELFObjectWriter(MCELFObjectTargetWriter *MOTW, raw_ostream &_OS, + bool IsLittleEndian) + : MCObjectWriter(_OS, IsLittleEndian), FWriter(IsLittleEndian), + TargetObjectWriter(MOTW), NeedsGOT(false) {} virtual ~ELFObjectWriter(); @@ -178,220 +199,194 @@ namespace { Write32(W); } - void StringLE16(char *buf, uint16_t Value) { - buf[0] = char(Value >> 0); - buf[1] = char(Value >> 8); - } - - void StringLE32(char *buf, uint32_t Value) { - StringLE16(buf, uint16_t(Value >> 0)); - StringLE16(buf + 2, uint16_t(Value >> 16)); - } - - void StringLE64(char *buf, uint64_t Value) { - StringLE32(buf, uint32_t(Value >> 0)); - StringLE32(buf + 4, uint32_t(Value >> 32)); - } - - void StringBE16(char *buf ,uint16_t Value) { - buf[0] = char(Value >> 8); - buf[1] = char(Value >> 0); - } - - void StringBE32(char *buf, uint32_t Value) { - StringBE16(buf, uint16_t(Value >> 16)); - StringBE16(buf + 2, uint16_t(Value >> 0)); - } - - void StringBE64(char *buf, uint64_t Value) { - StringBE32(buf, uint32_t(Value >> 32)); - StringBE32(buf + 4, uint32_t(Value >> 0)); + template void write(MCDataFragment &F, T Value) { + FWriter.write(F, Value); } - void String8(MCDataFragment &F, uint8_t Value) { - char buf[1]; - buf[0] = Value; - F.getContents() += StringRef(buf, 1); - } + void WriteHeader(const MCAssembler &Asm, + uint64_t SectionDataSize, + unsigned NumberOfSections); - void String16(MCDataFragment &F, uint16_t Value) { - char buf[2]; - if (isLittleEndian()) - StringLE16(buf, Value); - else - StringBE16(buf, Value); - F.getContents() += StringRef(buf, 2); - } - - void String32(MCDataFragment &F, uint32_t Value) { - char buf[4]; - if (isLittleEndian()) - StringLE32(buf, Value); - else - StringBE32(buf, Value); - F.getContents() += StringRef(buf, 4); - } - - void String64(MCDataFragment &F, uint64_t Value) { - char buf[8]; - if (isLittleEndian()) - StringLE64(buf, Value); - else - StringBE64(buf, Value); - F.getContents() += StringRef(buf, 8); - } - - virtual void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); - - /// Default e_flags = 0 - virtual void WriteEFlags() { Write32(0); } - - virtual void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF, - uint64_t name, uint8_t info, - uint64_t value, uint64_t size, - uint8_t other, uint32_t shndx, - bool Reserved); - - virtual void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF, - ELFSymbolData &MSD, + void WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD, const MCAsmLayout &Layout); - typedef DenseMap SectionIndexMapTy; - virtual void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF, - const MCAssembler &Asm, + void WriteSymbolTable(MCDataFragment *SymtabF, MCAssembler &Asm, const MCAsmLayout &Layout, - const SectionIndexMapTy &SectionIndexMap); + SectionIndexMapTy &SectionIndexMap); + + bool shouldRelocateWithSymbol(const MCAssembler &Asm, + const MCSymbolRefExpr *RefA, + const MCSymbolData *SD, uint64_t C, + unsigned Type) const; - virtual void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, - const MCFragment *Fragment, const MCFixup &Fixup, - MCValue Target, uint64_t &FixedValue); + void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, + const MCFragment *Fragment, const MCFixup &Fixup, + MCValue Target, bool &IsPCRel, + uint64_t &FixedValue) override; - virtual uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, + uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, const MCSymbol *S); // Map from a group section to the signature symbol typedef DenseMap GroupMapTy; // Map from a signature symbol to the group section typedef DenseMap RevGroupMapTy; + // Map from a section to the section with the relocations + typedef DenseMap RelMapTy; + // Map from a section to its offset + typedef DenseMap SectionOffsetMapTy; - /// ComputeSymbolTable - Compute the symbol table data + /// Compute the symbol table data /// - /// \param StringTable [out] - The string table data. - /// \param StringIndexMap [out] - Map from symbol names to offsets in the - /// string table. - virtual void ComputeSymbolTable(MCAssembler &Asm, + /// \param Asm - The assembler. + /// \param SectionIndexMap - Maps a section to its index. + /// \param RevGroupMap - Maps a signature symbol to the group section. + /// \param NumRegularSections - Number of non-relocation sections. + void computeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout, const SectionIndexMapTy &SectionIndexMap, - RevGroupMapTy RevGroupMap); + const RevGroupMapTy &RevGroupMap, + unsigned NumRegularSections); - virtual void ComputeIndexMap(MCAssembler &Asm, - SectionIndexMapTy &SectionIndexMap); + void ComputeIndexMap(MCAssembler &Asm, + SectionIndexMapTy &SectionIndexMap, + const RelMapTy &RelMap); - virtual void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, - const MCSectionData &SD); + void CreateRelocationSections(MCAssembler &Asm, MCAsmLayout &Layout, + RelMapTy &RelMap); - virtual void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { - for (MCAssembler::const_iterator it = Asm.begin(), - ie = Asm.end(); it != ie; ++it) { - WriteRelocation(Asm, Layout, *it); - } - } + void CompressDebugSections(MCAssembler &Asm, MCAsmLayout &Layout); - virtual void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout, - const SectionIndexMapTy &SectionIndexMap); + void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout, + const RelMapTy &RelMap); + + void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout, + SectionIndexMapTy &SectionIndexMap, + const RelMapTy &RelMap); // Create the sections that show up in the symbol table. Currently // those are the .note.GNU-stack section and the group sections. - virtual void CreateIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout, - GroupMapTy &GroupMap, - RevGroupMapTy &RevGroupMap); + void CreateIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout, + GroupMapTy &GroupMap, + RevGroupMapTy &RevGroupMap, + SectionIndexMapTy &SectionIndexMap, + const RelMapTy &RelMap); + + void ExecutePostLayoutBinding(MCAssembler &Asm, + const MCAsmLayout &Layout) override; + + void WriteSectionHeader(MCAssembler &Asm, const GroupMapTy &GroupMap, + const MCAsmLayout &Layout, + const SectionIndexMapTy &SectionIndexMap, + const SectionOffsetMapTy &SectionOffsetMap); - virtual void ExecutePostLayoutBinding(MCAssembler &Asm, - const MCAsmLayout &Layout); + void ComputeSectionOrder(MCAssembler &Asm, + std::vector &Sections); - virtual void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, + void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, uint64_t Address, uint64_t Offset, uint64_t Size, uint32_t Link, uint32_t Info, uint64_t Alignment, uint64_t EntrySize); - virtual void WriteRelocationsFragment(const MCAssembler &Asm, - MCDataFragment *F, - const MCSectionData *SD); + void WriteRelocationsFragment(const MCAssembler &Asm, + MCDataFragment *F, + const MCSectionData *SD); - virtual bool + bool IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm, const MCSymbolData &DataA, const MCFragment &FB, bool InSet, - bool IsPCRel) const; + bool IsPCRel) const override; - virtual void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); - virtual void WriteSection(MCAssembler &Asm, + void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout) override; + void WriteSection(MCAssembler &Asm, const SectionIndexMapTy &SectionIndexMap, uint32_t GroupSymbolIndex, uint64_t Offset, uint64_t Size, uint64_t Alignment, const MCSectionELF &Section); - - protected: - virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, - bool IsPCRel, bool IsRelocWithSymbol, - int64_t Addend) = 0; }; +} - //===- X86ELFObjectWriter -------------------------------------------===// +FragmentWriter::FragmentWriter(bool IsLittleEndian) + : IsLittleEndian(IsLittleEndian) {} - class X86ELFObjectWriter : public ELFObjectWriter { - public: - X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian); +template void FragmentWriter::write(MCDataFragment &F, T Val) { + if (IsLittleEndian) + Val = support::endian::byte_swap(Val); + else + Val = support::endian::byte_swap(Val); + const char *Start = (const char *)&Val; + F.getContents().append(Start, Start + sizeof(T)); +} - virtual ~X86ELFObjectWriter(); - protected: - virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, - bool IsPCRel, bool IsRelocWithSymbol, - int64_t Addend); - }; +void SymbolTableWriter::createSymtabShndx() { + if (ShndxF) + return; + MCContext &Ctx = Asm.getContext(); + const MCSectionELF *SymtabShndxSection = + Ctx.getELFSection(".symtab_shndxr", ELF::SHT_SYMTAB_SHNDX, 0, + SectionKind::getReadOnly(), 4, ""); + MCSectionData *SymtabShndxSD = + &Asm.getOrCreateSectionData(*SymtabShndxSection); + SymtabShndxSD->setAlignment(4); + ShndxF = new MCDataFragment(SymtabShndxSD); + unsigned Index = SectionIndexMap.size() + 1; + SectionIndexMap[SymtabShndxSection] = Index; + + for (unsigned I = 0; I < NumWritten; ++I) + write(*ShndxF, uint32_t(0)); +} - //===- ARMELFObjectWriter -------------------------------------------===// +template +void SymbolTableWriter::write(MCDataFragment &F, T Value) { + FWriter.write(F, Value); +} - class ARMELFObjectWriter : public ELFObjectWriter { - public: - // FIXME: MCAssembler can't yet return the Subtarget, - enum { DefaultEABIVersion = 0x05000000U }; +SymbolTableWriter::SymbolTableWriter(MCAssembler &Asm, FragmentWriter &FWriter, + bool Is64Bit, + SectionIndexMapTy &SectionIndexMap, + MCDataFragment *SymtabF) + : Asm(Asm), FWriter(FWriter), Is64Bit(Is64Bit), + SectionIndexMap(SectionIndexMap), SymtabF(SymtabF), ShndxF(nullptr), + NumWritten(0) {} - ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian); +void SymbolTableWriter::writeSymbol(uint32_t name, uint8_t info, uint64_t value, + uint64_t size, uint8_t other, + uint32_t shndx, bool Reserved) { + bool LargeIndex = shndx >= ELF::SHN_LORESERVE && !Reserved; - virtual ~ARMELFObjectWriter(); + if (LargeIndex) + createSymtabShndx(); - virtual void WriteEFlags(); - protected: - virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm, - const MCValue &Target, - const MCFragment &F, - bool IsBSS) const; - - virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, - bool IsPCRel, bool IsRelocWithSymbol, - int64_t Addend); - }; + if (ShndxF) { + if (LargeIndex) + write(*ShndxF, shndx); + else + write(*ShndxF, uint32_t(0)); + } - //===- MBlazeELFObjectWriter -------------------------------------------===// + uint16_t Index = LargeIndex ? uint16_t(ELF::SHN_XINDEX) : shndx; - class MBlazeELFObjectWriter : public ELFObjectWriter { - public: - MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian); + raw_svector_ostream OS(SymtabF->getContents()); - virtual ~MBlazeELFObjectWriter(); - protected: - virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, - bool IsPCRel, bool IsRelocWithSymbol, - int64_t Addend); - }; + if (Is64Bit) { + write(*SymtabF, name); // st_name + write(*SymtabF, info); // st_info + write(*SymtabF, other); // st_other + write(*SymtabF, Index); // st_shndx + write(*SymtabF, value); // st_value + write(*SymtabF, size); // st_size + } else { + write(*SymtabF, name); // st_name + write(*SymtabF, uint32_t(value)); // st_value + write(*SymtabF, uint32_t(size)); // st_size + write(*SymtabF, info); // st_info + write(*SymtabF, other); // st_other + write(*SymtabF, Index); // st_shndx + } + + ++NumWritten; } bool ELFObjectWriter::isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind) { @@ -408,6 +403,7 @@ bool ELFObjectWriter::RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) { case MCSymbolRefExpr::VK_GOT: case MCSymbolRefExpr::VK_PLT: case MCSymbolRefExpr::VK_GOTPCREL: + case MCSymbolRefExpr::VK_GOTOFF: case MCSymbolRefExpr::VK_TPOFF: case MCSymbolRefExpr::VK_TLSGD: case MCSymbolRefExpr::VK_GOTTPOFF: @@ -425,7 +421,8 @@ ELFObjectWriter::~ELFObjectWriter() {} // Emit the ELF header. -void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, +void ELFObjectWriter::WriteHeader(const MCAssembler &Asm, + uint64_t SectionDataSize, unsigned NumberOfSections) { // ELF Header // ---------- @@ -447,11 +444,7 @@ void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] // e_ident[EI_OSABI] - switch (TargetObjectWriter->getOSType()) { - case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break; - case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break; - default: Write8(ELF::ELFOSABI_NONE); break; - } + Write8(TargetObjectWriter->getOSABI()); Write8(0); // e_ident[EI_ABIVERSION] WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); @@ -467,7 +460,7 @@ void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes // e_flags = whatever the target wants - WriteEFlags(); + Write32(Asm.getELFHeaderEFlags()); // e_ehsize = ELF header size Write16(is64Bit() ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); @@ -480,73 +473,30 @@ void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, // e_shnum = # of section header ents if (NumberOfSections >= ELF::SHN_LORESERVE) - Write16(0); + Write16(ELF::SHN_UNDEF); else Write16(NumberOfSections); // e_shstrndx = Section # of '.shstrtab' - if (NumberOfSections >= ELF::SHN_LORESERVE) + if (ShstrtabIndex >= ELF::SHN_LORESERVE) Write16(ELF::SHN_XINDEX); else Write16(ShstrtabIndex); } -void ELFObjectWriter::WriteSymbolEntry(MCDataFragment *SymtabF, - MCDataFragment *ShndxF, - uint64_t name, - uint8_t info, uint64_t value, - uint64_t size, uint8_t other, - uint32_t shndx, - bool Reserved) { - if (ShndxF) { - if (shndx >= ELF::SHN_LORESERVE && !Reserved) - String32(*ShndxF, shndx); - else - String32(*ShndxF, 0); - } - - uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ? - uint16_t(ELF::SHN_XINDEX) : shndx; - - if (is64Bit()) { - String32(*SymtabF, name); // st_name - String8(*SymtabF, info); // st_info - String8(*SymtabF, other); // st_other - String16(*SymtabF, Index); // st_shndx - String64(*SymtabF, value); // st_value - String64(*SymtabF, size); // st_size - } else { - String32(*SymtabF, name); // st_name - String32(*SymtabF, value); // st_value - String32(*SymtabF, size); // st_size - String8(*SymtabF, info); // st_info - String8(*SymtabF, other); // st_other - String16(*SymtabF, Index); // st_shndx - } -} - uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { if (Data.isCommon() && Data.isExternal()) return Data.getCommonAlignment(); - const MCSymbol &Symbol = Data.getSymbol(); - - if (Symbol.isAbsolute() && Symbol.isVariable()) { - if (const MCExpr *Value = Symbol.getVariableValue()) { - int64_t IntValue; - if (Value->EvaluateAsAbsolute(IntValue, Layout)) - return (uint64_t)IntValue; - } - } - - if (!Symbol.isInSection()) + uint64_t Res; + if (!Layout.getSymbolOffset(&Data, Res)) return 0; - if (Data.getFragment()) - return Layout.getSymbolOffset(&Data); + if (Layout.getAssembler().isThumbFunc(&Data.getSymbol())) + Res |= 1; - return 0; + return Res; } void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm, @@ -554,15 +504,17 @@ void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm, // The presence of symbol versions causes undefined symbols and // versions declared with @@@ to be renamed. - for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), - ie = Asm.symbol_end(); it != ie; ++it) { - const MCSymbol &Alias = it->getSymbol(); - const MCSymbol &Symbol = Alias.AliasedSymbol(); - MCSymbolData &SD = Asm.getSymbolData(Symbol); + for (MCSymbolData &OriginalData : Asm.symbols()) { + const MCSymbol &Alias = OriginalData.getSymbol(); // Not an alias. - if (&Symbol == &Alias) + if (!Alias.isVariable()) continue; + auto *Ref = dyn_cast(Alias.getVariableValue()); + if (!Ref) + continue; + const MCSymbol &Symbol = Ref->getSymbol(); + MCSymbolData &SD = Asm.getSymbolData(Symbol); StringRef AliasName = Alias.getName(); size_t Pos = AliasName.find('@'); @@ -571,8 +523,8 @@ void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm, // Aliases defined with .symvar copy the binding from the symbol they alias. // This is the first place we are able to copy this information. - it->setExternal(SD.isExternal()); - MCELF::SetBinding(*it, MCELF::GetBinding(SD)); + OriginalData.setExternal(SD.isExternal()); + MCELF::SetBinding(OriginalData, MCELF::GetBinding(SD)); StringRef Rest = AliasName.substr(Pos); if (!Symbol.isUndefined() && !Rest.startswith("@@@")) @@ -587,30 +539,77 @@ void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm, } } -void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, - MCDataFragment *ShndxF, - ELFSymbolData &MSD, +static uint8_t mergeTypeForSet(uint8_t origType, uint8_t newType) { + uint8_t Type = newType; + + // Propagation rules: + // IFUNC > FUNC > OBJECT > NOTYPE + // TLS_OBJECT > OBJECT > NOTYPE + // + // dont let the new type degrade the old type + switch (origType) { + default: + break; + case ELF::STT_GNU_IFUNC: + if (Type == ELF::STT_FUNC || Type == ELF::STT_OBJECT || + Type == ELF::STT_NOTYPE || Type == ELF::STT_TLS) + Type = ELF::STT_GNU_IFUNC; + break; + case ELF::STT_FUNC: + if (Type == ELF::STT_OBJECT || Type == ELF::STT_NOTYPE || + Type == ELF::STT_TLS) + Type = ELF::STT_FUNC; + break; + case ELF::STT_OBJECT: + if (Type == ELF::STT_NOTYPE) + Type = ELF::STT_OBJECT; + break; + case ELF::STT_TLS: + if (Type == ELF::STT_OBJECT || Type == ELF::STT_NOTYPE || + Type == ELF::STT_GNU_IFUNC || Type == ELF::STT_FUNC) + Type = ELF::STT_TLS; + break; + } + + return Type; +} + +void ELFObjectWriter::WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD, const MCAsmLayout &Layout) { MCSymbolData &OrigData = *MSD.SymbolData; - MCSymbolData &Data = - Layout.getAssembler().getSymbolData(OrigData.getSymbol().AliasedSymbol()); + assert((!OrigData.getFragment() || + (&OrigData.getFragment()->getParent()->getSection() == + &OrigData.getSymbol().getSection())) && + "The symbol's section doesn't match the fragment's symbol"); + const MCSymbol *Base = Layout.getBaseSymbol(OrigData.getSymbol()); - bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() || - Data.getSymbol().isVariable(); + // This has to be in sync with when computeSymbolTable uses SHN_ABS or + // SHN_COMMON. + bool IsReserved = !Base || OrigData.isCommon(); + // Binding and Type share the same byte as upper and lower nibbles uint8_t Binding = MCELF::GetBinding(OrigData); - uint8_t Visibility = MCELF::GetVisibility(OrigData); - uint8_t Type = MCELF::GetType(Data); - + uint8_t Type = MCELF::GetType(OrigData); + MCSymbolData *BaseSD = nullptr; + if (Base) { + BaseSD = &Layout.getAssembler().getSymbolData(*Base); + Type = mergeTypeForSet(Type, MCELF::GetType(*BaseSD)); + } uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); - uint8_t Other = Visibility; - uint64_t Value = SymbolValue(Data, Layout); + // Other and Visibility share the same byte with Visibility using the lower + // 2 bits + uint8_t Visibility = MCELF::GetVisibility(OrigData); + uint8_t Other = MCELF::getOther(OrigData) << (ELF_STO_Shift - ELF_STV_Shift); + Other |= Visibility; + + uint64_t Value = SymbolValue(OrigData, Layout); uint64_t Size = 0; - assert(!(Data.isCommon() && !Data.isExternal())); + const MCExpr *ESize = OrigData.getSize(); + if (!ESize && Base) + ESize = BaseSD->getSize(); - const MCExpr *ESize = Data.getSize(); if (ESize) { int64_t Res; if (!ESize->EvaluateAsAbsolute(Res, Layout)) @@ -619,44 +618,35 @@ void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, } // Write out the symbol table entry - WriteSymbolEntry(SymtabF, ShndxF, MSD.StringIndex, Info, Value, - Size, Other, MSD.SectionIndex, IsReserved); + Writer.writeSymbol(MSD.StringIndex, Info, Value, Size, Other, + MSD.SectionIndex, IsReserved); } void ELFObjectWriter::WriteSymbolTable(MCDataFragment *SymtabF, - MCDataFragment *ShndxF, - const MCAssembler &Asm, + MCAssembler &Asm, const MCAsmLayout &Layout, - const SectionIndexMapTy &SectionIndexMap) { + SectionIndexMapTy &SectionIndexMap) { // The string table must be emitted first because we need the index // into the string table for all the symbol names. - assert(StringTable.size() && "Missing string table"); // FIXME: Make sure the start of the symbol table is aligned. + SymbolTableWriter Writer(Asm, FWriter, is64Bit(), SectionIndexMap, SymtabF); + // The first entry is the undefined symbol entry. - WriteSymbolEntry(SymtabF, ShndxF, 0, 0, 0, 0, 0, 0, false); + Writer.writeSymbol(0, 0, 0, 0, 0, 0, false); + + for (unsigned i = 0, e = FileSymbolData.size(); i != e; ++i) { + Writer.writeSymbol(FileSymbolData[i], ELF::STT_FILE | ELF::STB_LOCAL, 0, 0, + ELF::STV_DEFAULT, ELF::SHN_ABS, true); + } // Write the symbol table entries. - LastLocalSymbolIndex = LocalSymbolData.size() + 1; + LastLocalSymbolIndex = FileSymbolData.size() + LocalSymbolData.size() + 1; + for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { ELFSymbolData &MSD = LocalSymbolData[i]; - WriteSymbol(SymtabF, ShndxF, MSD, Layout); - } - - // Write out a symbol table entry for each regular section. - for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; - ++i) { - const MCSectionELF &Section = - static_cast(i->getSection()); - if (Section.getType() == ELF::SHT_RELA || - Section.getType() == ELF::SHT_REL || - Section.getType() == ELF::SHT_STRTAB || - Section.getType() == ELF::SHT_SYMTAB) - continue; - WriteSymbolEntry(SymtabF, ShndxF, 0, ELF::STT_SECTION, 0, 0, - ELF::STV_DEFAULT, SectionIndexMap.lookup(&Section), false); - LastLocalSymbolIndex++; + WriteSymbol(Writer, MSD, Layout); } for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { @@ -665,7 +655,7 @@ void ELFObjectWriter::WriteSymbolTable(MCDataFragment *SymtabF, assert(((Data.getFlags() & ELF_STB_Global) || (Data.getFlags() & ELF_STB_Weak)) && "External symbol requires STB_GLOBAL or STB_WEAK flag"); - WriteSymbol(SymtabF, ShndxF, MSD, Layout); + WriteSymbol(Writer, MSD, Layout); if (MCELF::GetBinding(Data) == ELF::STB_LOCAL) LastLocalSymbolIndex++; } @@ -673,147 +663,249 @@ void ELFObjectWriter::WriteSymbolTable(MCDataFragment *SymtabF, for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { ELFSymbolData &MSD = UndefinedSymbolData[i]; MCSymbolData &Data = *MSD.SymbolData; - WriteSymbol(SymtabF, ShndxF, MSD, Layout); + WriteSymbol(Writer, MSD, Layout); if (MCELF::GetBinding(Data) == ELF::STB_LOCAL) LastLocalSymbolIndex++; } } -const MCSymbol *ELFObjectWriter::SymbolToReloc(const MCAssembler &Asm, - const MCValue &Target, - const MCFragment &F) const { - const MCSymbol &Symbol = Target.getSymA()->getSymbol(); - const MCSymbol &ASymbol = Symbol.AliasedSymbol(); - const MCSymbol *Renamed = Renames.lookup(&Symbol); - const MCSymbolData &SD = Asm.getSymbolData(Symbol); - - if (ASymbol.isUndefined()) { - if (Renamed) - return Renamed; - return &ASymbol; - } +// It is always valid to create a relocation with a symbol. It is preferable +// to use a relocation with a section if that is possible. Using the section +// allows us to omit some local symbols from the symbol table. +bool ELFObjectWriter::shouldRelocateWithSymbol(const MCAssembler &Asm, + const MCSymbolRefExpr *RefA, + const MCSymbolData *SD, + uint64_t C, + unsigned Type) const { + // A PCRel relocation to an absolute value has no symbol (or section). We + // represent that with a relocation to a null section. + if (!RefA) + return false; - if (SD.isExternal()) { - if (Renamed) - return Renamed; - return &Symbol; - } + MCSymbolRefExpr::VariantKind Kind = RefA->getKind(); + switch (Kind) { + default: + break; + // The .odp creation emits a relocation against the symbol ".TOC." which + // create a R_PPC64_TOC relocation. However the relocation symbol name + // in final object creation should be NULL, since the symbol does not + // really exist, it is just the reference to TOC base for the current + // object file. Since the symbol is undefined, returning false results + // in a relocation with a null section which is the desired result. + case MCSymbolRefExpr::VK_PPC_TOCBASE: + return false; - const MCSectionELF &Section = - static_cast(ASymbol.getSection()); - const SectionKind secKind = Section.getKind(); + // These VariantKind cause the relocation to refer to something other than + // the symbol itself, like a linker generated table. Since the address of + // symbol is not relevant, we cannot replace the symbol with the + // section and patch the difference in the addend. + case MCSymbolRefExpr::VK_GOT: + case MCSymbolRefExpr::VK_PLT: + case MCSymbolRefExpr::VK_GOTPCREL: + case MCSymbolRefExpr::VK_Mips_GOT: + case MCSymbolRefExpr::VK_PPC_GOT_LO: + case MCSymbolRefExpr::VK_PPC_GOT_HI: + case MCSymbolRefExpr::VK_PPC_GOT_HA: + return true; + } - if (secKind.isBSS()) - return ExplicitRelSym(Asm, Target, F, true); + // An undefined symbol is not in any section, so the relocation has to point + // to the symbol itself. + const MCSymbol &Sym = SD->getSymbol(); + if (Sym.isUndefined()) + return true; - if (secKind.isThreadLocal()) { - if (Renamed) - return Renamed; - return &Symbol; + unsigned Binding = MCELF::GetBinding(*SD); + switch(Binding) { + default: + llvm_unreachable("Invalid Binding"); + case ELF::STB_LOCAL: + break; + case ELF::STB_WEAK: + // If the symbol is weak, it might be overridden by a symbol in another + // file. The relocation has to point to the symbol so that the linker + // can update it. + return true; + case ELF::STB_GLOBAL: + // Global ELF symbols can be preempted by the dynamic linker. The relocation + // has to point to the symbol for a reason analogous to the STB_WEAK case. + return true; } - MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); - const MCSectionELF &Sec2 = - static_cast(F.getParent()->getSection()); - - if (&Sec2 != &Section && - (Kind == MCSymbolRefExpr::VK_PLT || - Kind == MCSymbolRefExpr::VK_GOTPCREL || - Kind == MCSymbolRefExpr::VK_GOTOFF)) { - if (Renamed) - return Renamed; - return &Symbol; - } + // If a relocation points to a mergeable section, we have to be careful. + // If the offset is zero, a relocation with the section will encode the + // same information. With a non-zero offset, the situation is different. + // For example, a relocation can point 42 bytes past the end of a string. + // If we change such a relocation to use the section, the linker would think + // that it pointed to another string and subtracting 42 at runtime will + // produce the wrong value. + auto &Sec = cast(Sym.getSection()); + unsigned Flags = Sec.getFlags(); + if (Flags & ELF::SHF_MERGE) { + if (C != 0) + return true; - if (Section.getFlags() & ELF::SHF_MERGE) { - if (Target.getConstant() == 0) - return NULL; - if (Renamed) - return Renamed; - return &Symbol; + // It looks like gold has a bug (http://sourceware.org/PR16794) and can + // only handle section relocations to mergeable sections if using RELA. + if (!hasRelocationAddend()) + return true; } - return ExplicitRelSym(Asm, Target, F, false); + // Most TLS relocations use a got, so they need the symbol. Even those that + // are just an offset (@tpoff), require a symbol in gold versions before + // 5efeedf61e4fe720fd3e9a08e6c91c10abb66d42 (2014-09-26) which fixed + // http://sourceware.org/PR16773. + if (Flags & ELF::SHF_TLS) + return true; + + // If the symbol is a thumb function the final relocation must set the lowest + // bit. With a symbol that is done by just having the symbol have that bit + // set, so we would lose the bit if we relocated with the section. + // FIXME: We could use the section but add the bit to the relocation value. + if (Asm.isThumbFunc(&Sym)) + return true; + + if (TargetObjectWriter->needsRelocateWithSymbol(*SD, Type)) + return true; + return false; } +static const MCSymbol *getWeakRef(const MCSymbolRefExpr &Ref) { + const MCSymbol &Sym = Ref.getSymbol(); + + if (Ref.getKind() == MCSymbolRefExpr::VK_WEAKREF) + return &Sym; + + if (!Sym.isVariable()) + return nullptr; + + const MCExpr *Expr = Sym.getVariableValue(); + const auto *Inner = dyn_cast(Expr); + if (!Inner) + return nullptr; + + if (Inner->getKind() == MCSymbolRefExpr::VK_WEAKREF) + return &Inner->getSymbol(); + return nullptr; +} void ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, const MCFragment *Fragment, const MCFixup &Fixup, MCValue Target, + bool &IsPCRel, uint64_t &FixedValue) { - int64_t Addend = 0; - int Index = 0; - int64_t Value = Target.getConstant(); - const MCSymbol *RelocSymbol = NULL; - - bool IsPCRel = isFixupKindPCRel(Asm, Fixup.getKind()); - if (!Target.isAbsolute()) { - const MCSymbol &Symbol = Target.getSymA()->getSymbol(); - const MCSymbol &ASymbol = Symbol.AliasedSymbol(); - RelocSymbol = SymbolToReloc(Asm, Target, *Fragment); - - if (const MCSymbolRefExpr *RefB = Target.getSymB()) { - const MCSymbol &SymbolB = RefB->getSymbol(); - MCSymbolData &SDB = Asm.getSymbolData(SymbolB); - IsPCRel = true; - - // Offset of the symbol in the section - int64_t a = Layout.getSymbolOffset(&SDB); - - // Ofeset of the relocation in the section - int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); - Value += b - a; - } + const MCSectionData *FixupSection = Fragment->getParent(); + uint64_t C = Target.getConstant(); + uint64_t FixupOffset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); + + if (const MCSymbolRefExpr *RefB = Target.getSymB()) { + assert(RefB->getKind() == MCSymbolRefExpr::VK_None && + "Should not have constructed this"); + + // Let A, B and C being the components of Target and R be the location of + // the fixup. If the fixup is not pcrel, we want to compute (A - B + C). + // If it is pcrel, we want to compute (A - B + C - R). + + // In general, ELF has no relocations for -B. It can only represent (A + C) + // or (A + C - R). If B = R + K and the relocation is not pcrel, we can + // replace B to implement it: (A - R - K + C) + if (IsPCRel) + Asm.getContext().FatalError( + Fixup.getLoc(), + "No relocation available to represent this relative expression"); + + const MCSymbol &SymB = RefB->getSymbol(); + + if (SymB.isUndefined()) + Asm.getContext().FatalError( + Fixup.getLoc(), + Twine("symbol '") + SymB.getName() + + "' can not be undefined in a subtraction expression"); + + assert(!SymB.isAbsolute() && "Should have been folded"); + const MCSection &SecB = SymB.getSection(); + if (&SecB != &FixupSection->getSection()) + Asm.getContext().FatalError( + Fixup.getLoc(), "Cannot represent a difference across sections"); + + const MCSymbolData &SymBD = Asm.getSymbolData(SymB); + uint64_t SymBOffset = Layout.getSymbolOffset(&SymBD); + uint64_t K = SymBOffset - FixupOffset; + IsPCRel = true; + C -= K; + } - if (!RelocSymbol) { - MCSymbolData &SD = Asm.getSymbolData(ASymbol); - MCFragment *F = SD.getFragment(); + // We either rejected the fixup or folded B into C at this point. + const MCSymbolRefExpr *RefA = Target.getSymA(); + const MCSymbol *SymA = RefA ? &RefA->getSymbol() : nullptr; + const MCSymbolData *SymAD = SymA ? &Asm.getSymbolData(*SymA) : nullptr; - Index = F->getParent()->getOrdinal() + 1; + unsigned Type = GetRelocType(Target, Fixup, IsPCRel); + bool RelocateWithSymbol = shouldRelocateWithSymbol(Asm, RefA, SymAD, C, Type); + if (!RelocateWithSymbol && SymA && !SymA->isUndefined()) + C += Layout.getSymbolOffset(SymAD); - // Offset of the symbol in the section - Value += Layout.getSymbolOffset(&SD); - } else { - if (Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref) - WeakrefUsedInReloc.insert(RelocSymbol); - else - UsedInReloc.insert(RelocSymbol); - Index = -1; - } - Addend = Value; - // Compensate for the addend on i386. - if (is64Bit()) - Value = 0; + uint64_t Addend = 0; + if (hasRelocationAddend()) { + Addend = C; + C = 0; } - FixedValue = Value; - unsigned Type = GetRelocType(Target, Fixup, IsPCRel, - (RelocSymbol != 0), Addend); + FixedValue = C; + + // FIXME: What is this!?!? + MCSymbolRefExpr::VariantKind Modifier = + RefA ? RefA->getKind() : MCSymbolRefExpr::VK_None; + if (RelocNeedsGOT(Modifier)) + NeedsGOT = true; + + if (!RelocateWithSymbol) { + const MCSection *SecA = + (SymA && !SymA->isUndefined()) ? &SymA->getSection() : nullptr; + auto *ELFSec = cast_or_null(SecA); + MCSymbol *SectionSymbol = + ELFSec ? Asm.getContext().getOrCreateSectionSymbol(*ELFSec) + : nullptr; + ELFRelocationEntry Rec(FixupOffset, SectionSymbol, Type, Addend); + Relocations[FixupSection].push_back(Rec); + return; + } - uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) + - Fixup.getOffset(); + if (SymA) { + if (const MCSymbol *R = Renames.lookup(SymA)) + SymA = R; - if (!hasRelocationAddend()) - Addend = 0; - ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend); - Relocations[Fragment->getParent()].push_back(ERE); + if (const MCSymbol *WeakRef = getWeakRef(*RefA)) + WeakrefUsedInReloc.insert(WeakRef); + else + UsedInReloc.insert(SymA); + } + ELFRelocationEntry Rec(FixupOffset, SymA, Type, Addend); + Relocations[FixupSection].push_back(Rec); + return; } uint64_t ELFObjectWriter::getSymbolIndexInSymbolTable(const MCAssembler &Asm, const MCSymbol *S) { - MCSymbolData &SD = Asm.getSymbolData(*S); + const MCSymbolData &SD = Asm.getSymbolData(*S); return SD.getIndex(); } -bool ELFObjectWriter::isInSymtab(const MCAssembler &Asm, - const MCSymbolData &Data, - bool Used, bool Renamed) { - if (Data.getFlags() & ELF_Other_Weakref) - return false; +bool ELFObjectWriter::isInSymtab(const MCAsmLayout &Layout, + const MCSymbolData &Data, bool Used, + bool Renamed) { + const MCSymbol &Symbol = Data.getSymbol(); + if (Symbol.isVariable()) { + const MCExpr *Expr = Symbol.getVariableValue(); + if (const MCSymbolRefExpr *Ref = dyn_cast(Expr)) { + if (Ref->getKind() == MCSymbolRefExpr::VK_WEAKREF) + return false; + } + } if (Used) return true; @@ -821,48 +913,42 @@ bool ELFObjectWriter::isInSymtab(const MCAssembler &Asm, if (Renamed) return false; - const MCSymbol &Symbol = Data.getSymbol(); - if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_") return true; - const MCSymbol &A = Symbol.AliasedSymbol(); - if (Symbol.isVariable() && !A.isVariable() && A.isUndefined()) - return false; + if (Symbol.isVariable()) { + const MCSymbol *Base = Layout.getBaseSymbol(Symbol); + if (Base && Base->isUndefined()) + return false; + } bool IsGlobal = MCELF::GetBinding(Data) == ELF::STB_GLOBAL; if (!Symbol.isVariable() && Symbol.isUndefined() && !IsGlobal) return false; - if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined()) - return false; - if (Symbol.isTemporary()) return false; return true; } -bool ELFObjectWriter::isLocal(const MCSymbolData &Data, bool isSignature, - bool isUsedInReloc) { +bool ELFObjectWriter::isLocal(const MCSymbolData &Data, bool isUsedInReloc) { if (Data.isExternal()) return false; const MCSymbol &Symbol = Data.getSymbol(); - const MCSymbol &RefSymbol = Symbol.AliasedSymbol(); - - if (RefSymbol.isUndefined() && !RefSymbol.isVariable()) { - if (isSignature && !isUsedInReloc) - return true; + if (Symbol.isDefined()) + return true; + if (isUsedInReloc) return false; - } return true; } void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, - SectionIndexMapTy &SectionIndexMap) { + SectionIndexMapTy &SectionIndexMap, + const RelMapTy &RelMap) { unsigned Index = 1; for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it) { @@ -877,77 +963,75 @@ void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, ie = Asm.end(); it != ie; ++it) { const MCSectionELF &Section = static_cast(it->getSection()); - if (Section.getType() == ELF::SHT_GROUP) + if (Section.getType() == ELF::SHT_GROUP || + Section.getType() == ELF::SHT_REL || + Section.getType() == ELF::SHT_RELA) continue; SectionIndexMap[&Section] = Index++; + const MCSectionELF *RelSection = RelMap.lookup(&Section); + if (RelSection) + SectionIndexMap[RelSection] = Index++; } } -void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, - const SectionIndexMapTy &SectionIndexMap, - RevGroupMapTy RevGroupMap) { +void +ELFObjectWriter::computeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout, + const SectionIndexMapTy &SectionIndexMap, + const RevGroupMapTy &RevGroupMap, + unsigned NumRegularSections) { // FIXME: Is this the correct place to do this? + // FIXME: Why is an undefined reference to _GLOBAL_OFFSET_TABLE_ needed? if (NeedsGOT) { - llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_"; + StringRef Name = "_GLOBAL_OFFSET_TABLE_"; MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name); MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym); Data.setExternal(true); MCELF::SetBinding(Data, ELF::STB_GLOBAL); } - // Build section lookup table. - int NumRegularSections = Asm.size(); - - // Index 0 is always the empty string. - StringMap StringIndexMap; - StringTable += '\x00'; - // Add the data for the symbols. - for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), - ie = Asm.symbol_end(); it != ie; ++it) { - const MCSymbol &Symbol = it->getSymbol(); + for (MCSymbolData &SD : Asm.symbols()) { + const MCSymbol &Symbol = SD.getSymbol(); bool Used = UsedInReloc.count(&Symbol); bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol); bool isSignature = RevGroupMap.count(&Symbol); - if (!isInSymtab(Asm, *it, + if (!isInSymtab(Layout, SD, Used || WeakrefUsed || isSignature, Renames.count(&Symbol))) continue; ELFSymbolData MSD; - MSD.SymbolData = it; - const MCSymbol &RefSymbol = Symbol.AliasedSymbol(); + MSD.SymbolData = &SD; + const MCSymbol *BaseSymbol = Layout.getBaseSymbol(Symbol); // Undefined symbols are global, but this is the first place we // are able to set it. - bool Local = isLocal(*it, isSignature, Used); - if (!Local && MCELF::GetBinding(*it) == ELF::STB_LOCAL) { - MCSymbolData &SD = Asm.getSymbolData(RefSymbol); - MCELF::SetBinding(*it, ELF::STB_GLOBAL); + bool Local = isLocal(SD, Used); + if (!Local && MCELF::GetBinding(SD) == ELF::STB_LOCAL) { + assert(BaseSymbol); + MCSymbolData &BaseData = Asm.getSymbolData(*BaseSymbol); MCELF::SetBinding(SD, ELF::STB_GLOBAL); + MCELF::SetBinding(BaseData, ELF::STB_GLOBAL); } - if (RefSymbol.isUndefined() && !Used && WeakrefUsed) - MCELF::SetBinding(*it, ELF::STB_WEAK); - - if (it->isCommon()) { + if (!BaseSymbol) { + MSD.SectionIndex = ELF::SHN_ABS; + } else if (SD.isCommon()) { assert(!Local); MSD.SectionIndex = ELF::SHN_COMMON; - } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { - MSD.SectionIndex = ELF::SHN_ABS; - } else if (RefSymbol.isUndefined()) { + } else if (BaseSymbol->isUndefined()) { if (isSignature && !Used) - MSD.SectionIndex = SectionIndexMap.lookup(RevGroupMap[&Symbol]); + MSD.SectionIndex = SectionIndexMap.lookup(RevGroupMap.lookup(&Symbol)); else MSD.SectionIndex = ELF::SHN_UNDEF; + if (!Used && WeakrefUsed) + MCELF::SetBinding(SD, ELF::STB_WEAK); } else { const MCSectionELF &Section = - static_cast(RefSymbol.getSection()); + static_cast(BaseSymbol->getSection()); MSD.SectionIndex = SectionIndexMap.lookup(&Section); - if (MSD.SectionIndex >= ELF::SHN_LORESERVE) - NeedsSymtabShndx = true; assert(MSD.SectionIndex && "Invalid section index!"); } @@ -955,7 +1039,6 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, // @@ in defined ones. StringRef Name = Symbol.getName(); SmallString<32> Buf; - size_t Pos = Name.find("@@@"); if (Pos != StringRef::npos) { Buf += Name.substr(0, Pos); @@ -964,13 +1047,10 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, Name = Buf; } - uint64_t &Entry = StringIndexMap[Name]; - if (!Entry) { - Entry = StringTable.size(); - StringTable += Name; - StringTable += '\x00'; - } - MSD.StringIndex = Entry; + // Sections have their own string table + if (MCELF::GetType(SD) != ELF::STT_SECTION) + MSD.Name = StrTabBuilder.add(Name); + if (MSD.SectionIndex == ELF::SHN_UNDEF) UndefinedSymbolData.push_back(MSD); else if (Local) @@ -979,6 +1059,23 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, ExternalSymbolData.push_back(MSD); } + for (auto i = Asm.file_names_begin(), e = Asm.file_names_end(); i != e; ++i) + StrTabBuilder.add(*i); + + StrTabBuilder.finalize(StringTableBuilder::ELF); + + for (auto i = Asm.file_names_begin(), e = Asm.file_names_end(); i != e; ++i) + FileSymbolData.push_back(StrTabBuilder.getOffset(*i)); + + for (ELFSymbolData &MSD : LocalSymbolData) + MSD.StringIndex = MCELF::GetType(*MSD.SymbolData) == ELF::STT_SECTION + ? 0 + : StrTabBuilder.getOffset(MSD.Name); + for (ELFSymbolData &MSD : ExternalSymbolData) + MSD.StringIndex = StrTabBuilder.getOffset(MSD.Name); + for (ELFSymbolData& MSD : UndefinedSymbolData) + MSD.StringIndex = StrTabBuilder.getOffset(MSD.Name); + // Symbols are required to be in lexicographic order. array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); @@ -986,23 +1083,26 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, // Set the symbol indices. Local symbols must come before all other // symbols with non-local bindings. - unsigned Index = 1; + unsigned Index = FileSymbolData.size() + 1; for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) LocalSymbolData[i].SymbolData->setIndex(Index++); - Index += NumRegularSections; - for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) ExternalSymbolData[i].SymbolData->setIndex(Index++); for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) UndefinedSymbolData[i].SymbolData->setIndex(Index++); } -void ELFObjectWriter::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, - const MCSectionData &SD) { - if (!Relocations[&SD].empty()) { +void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm, + MCAsmLayout &Layout, + RelMapTy &RelMap) { + for (MCAssembler::const_iterator it = Asm.begin(), + ie = Asm.end(); it != ie; ++it) { + const MCSectionData &SD = *it; + if (Relocations[&SD].empty()) + continue; + MCContext &Ctx = Asm.getContext(); - const MCSectionELF *RelaSection; const MCSectionELF &Section = static_cast(SD.getSection()); @@ -1016,17 +1116,184 @@ void ELFObjectWriter::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, else EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); - RelaSection = Ctx.getELFSection(RelaSectionName, hasRelocationAddend() ? - ELF::SHT_RELA : ELF::SHT_REL, 0, - SectionKind::getReadOnly(), - EntrySize, ""); + unsigned Flags = 0; + StringRef Group = ""; + if (Section.getFlags() & ELF::SHF_GROUP) { + Flags = ELF::SHF_GROUP; + Group = Section.getGroup()->getName(); + } + + const MCSectionELF *RelaSection = + Ctx.getELFSection(RelaSectionName, hasRelocationAddend() ? + ELF::SHT_RELA : ELF::SHT_REL, Flags, + SectionKind::getReadOnly(), + EntrySize, Group); + RelMap[&Section] = RelaSection; + Asm.getOrCreateSectionData(*RelaSection); + } +} + +static SmallVector +getUncompressedData(MCAsmLayout &Layout, + MCSectionData::FragmentListType &Fragments) { + SmallVector UncompressedData; + for (const MCFragment &F : Fragments) { + const SmallVectorImpl *Contents; + switch (F.getKind()) { + case MCFragment::FT_Data: + Contents = &cast(F).getContents(); + break; + case MCFragment::FT_Dwarf: + Contents = &cast(F).getContents(); + break; + case MCFragment::FT_DwarfFrame: + Contents = &cast(F).getContents(); + break; + default: + llvm_unreachable( + "Not expecting any other fragment types in a debug_* section"); + } + UncompressedData.append(Contents->begin(), Contents->end()); + } + return UncompressedData; +} + +// Include the debug info compression header: +// "ZLIB" followed by 8 bytes representing the uncompressed size of the section, +// useful for consumers to preallocate a buffer to decompress into. +static bool +prependCompressionHeader(uint64_t Size, + SmallVectorImpl &CompressedContents) { + static const StringRef Magic = "ZLIB"; + if (Size <= Magic.size() + sizeof(Size) + CompressedContents.size()) + return false; + if (sys::IsLittleEndianHost) + sys::swapByteOrder(Size); + CompressedContents.insert(CompressedContents.begin(), + Magic.size() + sizeof(Size), 0); + std::copy(Magic.begin(), Magic.end(), CompressedContents.begin()); + std::copy(reinterpret_cast(&Size), + reinterpret_cast(&Size + 1), + CompressedContents.begin() + Magic.size()); + return true; +} + +// Return a single fragment containing the compressed contents of the whole +// section. Null if the section was not compressed for any reason. +static std::unique_ptr +getCompressedFragment(MCAsmLayout &Layout, + MCSectionData::FragmentListType &Fragments) { + std::unique_ptr CompressedFragment(new MCDataFragment()); + + // Gather the uncompressed data from all the fragments, recording the + // alignment fragment, if seen, and any fixups. + SmallVector UncompressedData = + getUncompressedData(Layout, Fragments); + + SmallVectorImpl &CompressedContents = CompressedFragment->getContents(); + + zlib::Status Success = zlib::compress( + StringRef(UncompressedData.data(), UncompressedData.size()), + CompressedContents); + if (Success != zlib::StatusOK) + return nullptr; + + if (!prependCompressionHeader(UncompressedData.size(), CompressedContents)) + return nullptr; + return CompressedFragment; +} + +typedef DenseMap> +DefiningSymbolMap; + +static void UpdateSymbols(const MCAsmLayout &Layout, + const std::vector &Symbols, + MCFragment &NewFragment) { + for (MCSymbolData *Sym : Symbols) { + Sym->setOffset(Sym->getOffset() + + Layout.getFragmentOffset(Sym->getFragment())); + Sym->setFragment(&NewFragment); + } +} + +static void CompressDebugSection(MCAssembler &Asm, MCAsmLayout &Layout, + const DefiningSymbolMap &DefiningSymbols, + const MCSectionELF &Section, + MCSectionData &SD) { + StringRef SectionName = Section.getSectionName(); + MCSectionData::FragmentListType &Fragments = SD.getFragmentList(); + + std::unique_ptr CompressedFragment = + getCompressedFragment(Layout, Fragments); + + // Leave the section as-is if the fragments could not be compressed. + if (!CompressedFragment) + return; + + // Update the fragment+offsets of any symbols referring to fragments in this + // section to refer to the new fragment. + auto I = DefiningSymbols.find(&SD); + if (I != DefiningSymbols.end()) + UpdateSymbols(Layout, I->second, *CompressedFragment); + + // Invalidate the layout for the whole section since it will have new and + // different fragments now. + Layout.invalidateFragmentsFrom(&Fragments.front()); + Fragments.clear(); + + // Complete the initialization of the new fragment + CompressedFragment->setParent(&SD); + CompressedFragment->setLayoutOrder(0); + Fragments.push_back(CompressedFragment.release()); + + // Rename from .debug_* to .zdebug_* + Asm.getContext().renameELFSection(&Section, + (".z" + SectionName.drop_front(1)).str()); +} + +void ELFObjectWriter::CompressDebugSections(MCAssembler &Asm, + MCAsmLayout &Layout) { + if (!Asm.getContext().getAsmInfo()->compressDebugSections()) + return; + + DefiningSymbolMap DefiningSymbols; + + for (MCSymbolData &SD : Asm.symbols()) + if (MCFragment *F = SD.getFragment()) + DefiningSymbols[F->getParent()].push_back(&SD); + + for (MCSectionData &SD : Asm) { + const MCSectionELF &Section = + static_cast(SD.getSection()); + StringRef SectionName = Section.getSectionName(); + + // Compressing debug_frame requires handling alignment fragments which is + // more work (possibly generalizing MCAssembler.cpp:writeFragment to allow + // for writing to arbitrary buffers) for little benefit. + if (!SectionName.startswith(".debug_") || SectionName == ".debug_frame") + continue; + + CompressDebugSection(Asm, Layout, DefiningSymbols, Section, SD); + } +} + +void ELFObjectWriter::WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout, + const RelMapTy &RelMap) { + for (MCAssembler::const_iterator it = Asm.begin(), + ie = Asm.end(); it != ie; ++it) { + const MCSectionData &SD = *it; + const MCSectionELF &Section = + static_cast(SD.getSection()); + + const MCSectionELF *RelaSection = RelMap.lookup(&Section); + if (!RelaSection) + continue; MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); RelaSD.setAlignment(is64Bit() ? 8 : 4); MCDataFragment *F = new MCDataFragment(&RelaSD); - - WriteRelocationsFragment(Asm, F, &SD); + WriteRelocationsFragment(Asm, F, &*it); } } @@ -1048,47 +1315,69 @@ void ELFObjectWriter::WriteSecHdrEntry(uint32_t Name, uint32_t Type, WriteWord(EntrySize); // sh_entsize } +// ELF doesn't require relocations to be in any order. We sort by the r_offset, +// just to match gnu as for easier comparison. The use type is an arbitrary way +// of making the sort deterministic. +static int cmpRel(const ELFRelocationEntry *AP, const ELFRelocationEntry *BP) { + const ELFRelocationEntry &A = *AP; + const ELFRelocationEntry &B = *BP; + if (A.Offset != B.Offset) + return B.Offset - A.Offset; + if (B.Type != A.Type) + return A.Type - B.Type; + llvm_unreachable("ELFRelocs might be unstable!"); +} + +static void sortRelocs(const MCAssembler &Asm, + std::vector &Relocs) { + array_pod_sort(Relocs.begin(), Relocs.end(), cmpRel); +} + void ELFObjectWriter::WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, const MCSectionData *SD) { std::vector &Relocs = Relocations[SD]; - // sort by the r_offset just like gnu as does - array_pod_sort(Relocs.begin(), Relocs.end()); + + sortRelocs(Asm, Relocs); for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { - ELFRelocationEntry entry = Relocs[e - i - 1]; + const ELFRelocationEntry &Entry = Relocs[e - i - 1]; + unsigned Index = + Entry.Symbol ? getSymbolIndexInSymbolTable(Asm, Entry.Symbol) : 0; - if (!entry.Index) - ; - else if (entry.Index < 0) - entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol); - else - entry.Index += LocalSymbolData.size(); if (is64Bit()) { - String64(*F, entry.r_offset); - - struct ELF::Elf64_Rela ERE64; - ERE64.setSymbolAndType(entry.Index, entry.Type); - String64(*F, ERE64.r_info); - + write(*F, Entry.Offset); + if (TargetObjectWriter->isN64()) { + write(*F, uint32_t(Index)); + + write(*F, TargetObjectWriter->getRSsym(Entry.Type)); + write(*F, TargetObjectWriter->getRType3(Entry.Type)); + write(*F, TargetObjectWriter->getRType2(Entry.Type)); + write(*F, TargetObjectWriter->getRType(Entry.Type)); + } else { + struct ELF::Elf64_Rela ERE64; + ERE64.setSymbolAndType(Index, Entry.Type); + write(*F, ERE64.r_info); + } if (hasRelocationAddend()) - String64(*F, entry.r_addend); + write(*F, Entry.Addend); } else { - String32(*F, entry.r_offset); + write(*F, uint32_t(Entry.Offset)); struct ELF::Elf32_Rela ERE32; - ERE32.setSymbolAndType(entry.Index, entry.Type); - String32(*F, ERE32.r_info); + ERE32.setSymbolAndType(Index, Entry.Type); + write(*F, ERE32.r_info); if (hasRelocationAddend()) - String32(*F, entry.r_addend); + write(*F, uint32_t(Entry.Addend)); } } } void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout, - const SectionIndexMapTy &SectionIndexMap) { + SectionIndexMapTy &SectionIndexMap, + const RelMapTy &RelMap) { MCContext &Ctx = Asm.getContext(); MCDataFragment *F; @@ -1100,7 +1389,6 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, SectionKind::getReadOnly()); MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); ShstrtabSD.setAlignment(1); - ShstrtabIndex = Asm.size(); const MCSectionELF *SymtabSection = Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, @@ -1108,82 +1396,47 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, EntrySize, ""); MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); SymtabSD.setAlignment(is64Bit() ? 8 : 4); - SymbolTableIndex = Asm.size(); - - MCSectionData *SymtabShndxSD = NULL; - if (NeedsSymtabShndx) { - const MCSectionELF *SymtabShndxSection = - Ctx.getELFSection(".symtab_shndx", ELF::SHT_SYMTAB_SHNDX, 0, - SectionKind::getReadOnly(), 4, ""); - SymtabShndxSD = &Asm.getOrCreateSectionData(*SymtabShndxSection); - SymtabShndxSD->setAlignment(4); - } - - const MCSection *StrtabSection; + const MCSectionELF *StrtabSection; StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, SectionKind::getReadOnly()); MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); StrtabSD.setAlignment(1); - StringTableIndex = Asm.size(); - WriteRelocations(Asm, Layout); + ComputeIndexMap(Asm, SectionIndexMap, RelMap); + + ShstrtabIndex = SectionIndexMap.lookup(ShstrtabSection); + SymbolTableIndex = SectionIndexMap.lookup(SymtabSection); + StringTableIndex = SectionIndexMap.lookup(StrtabSection); // Symbol table F = new MCDataFragment(&SymtabSD); - MCDataFragment *ShndxF = NULL; - if (NeedsSymtabShndx) { - ShndxF = new MCDataFragment(SymtabShndxSD); - } - WriteSymbolTable(F, ShndxF, Asm, Layout, SectionIndexMap); + WriteSymbolTable(F, Asm, Layout, SectionIndexMap); F = new MCDataFragment(&StrtabSD); - F->getContents().append(StringTable.begin(), StringTable.end()); + F->getContents().append(StrTabBuilder.data().begin(), + StrTabBuilder.data().end()); F = new MCDataFragment(&ShstrtabSD); // Section header string table. - // - // The first entry of a string table holds a null character so skip - // section 0. - uint64_t Index = 1; - F->getContents() += '\x00'; - - StringMap SecStringMap; - for (MCAssembler::const_iterator it = Asm.begin(), - ie = Asm.end(); it != ie; ++it) { + for (auto it = Asm.begin(), ie = Asm.end(); it != ie; ++it) { const MCSectionELF &Section = static_cast(it->getSection()); - // FIXME: We could merge suffixes like in .text and .rela.text. - - StringRef Name = Section.getSectionName(); - if (SecStringMap.count(Name)) { - SectionStringTableIndex[&Section] = SecStringMap[Name]; - continue; - } - // Remember the index into the string table so we can write it - // into the sh_name field of the section header table. - SectionStringTableIndex[&Section] = Index; - SecStringMap[Name] = Index; - - Index += Name.size() + 1; - F->getContents() += Name; - F->getContents() += '\x00'; + ShStrTabBuilder.add(Section.getSectionName()); } + ShStrTabBuilder.finalize(StringTableBuilder::ELF); + F->getContents().append(ShStrTabBuilder.data().begin(), + ShStrTabBuilder.data().end()); } void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout, GroupMapTy &GroupMap, - RevGroupMapTy &RevGroupMap) { - // Create the .note.GNU-stack section if needed. + RevGroupMapTy &RevGroupMap, + SectionIndexMapTy &SectionIndexMap, + const RelMapTy &RelMap) { MCContext &Ctx = Asm.getContext(); - if (Asm.getNoExecStack()) { - const MCSectionELF *GnuStackSection = - Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS, 0, - SectionKind::getReadOnly()); - Asm.getOrCreateSectionData(*GnuStackSection); - } // Build the groups for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); @@ -1201,16 +1454,16 @@ void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm, MCSectionData &Data = Asm.getOrCreateSectionData(*Group); Data.setAlignment(4); MCDataFragment *F = new MCDataFragment(&Data); - String32(*F, ELF::GRP_COMDAT); + write(*F, uint32_t(ELF::GRP_COMDAT)); } GroupMap[Group] = SignatureSymbol; } + ComputeIndexMap(Asm, SectionIndexMap, RelMap); + // Add sections to the groups - unsigned Index = 1; - unsigned NumGroups = RevGroupMap.size(); for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); - it != ie; ++it, ++Index) { + it != ie; ++it) { const MCSectionELF &Section = static_cast(it->getSection()); if (!(Section.getFlags() & ELF::SHF_GROUP)) @@ -1219,7 +1472,8 @@ void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm, MCSectionData &Data = Asm.getOrCreateSectionData(*Group); // FIXME: we could use the previous fragment MCDataFragment *F = new MCDataFragment(&Data); - String32(*F, NumGroups + Index); + uint32_t Index = SectionIndexMap.lookup(&Section); + write(*F, Index); } } @@ -1234,7 +1488,7 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm, switch(Section.getType()) { case ELF::SHT_DYNAMIC: - sh_link = SectionStringTableIndex[&Section]; + sh_link = ShStrTabBuilder.getOffset(Section.getSectionName()); sh_info = 0; break; @@ -1251,10 +1505,12 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm, // Remove ".rel" and ".rela" prefixes. unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; StringRef SectionName = Section.getSectionName().substr(SecNameLen); + StringRef GroupName = + Section.getGroup() ? Section.getGroup()->getName() : ""; - InfoSection = Asm.getContext().getELFSection(SectionName, - ELF::SHT_PROGBITS, 0, - SectionKind::getReadOnly()); + InfoSection = Asm.getContext().getELFSection(SectionName, ELF::SHT_PROGBITS, + 0, SectionKind::getReadOnly(), + 0, GroupName); sh_info = SectionIndexMap.lookup(InfoSection); break; } @@ -1279,21 +1535,42 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm, case ELF::SHT_FINI_ARRAY: case ELF::SHT_PREINIT_ARRAY: case ELF::SHT_X86_64_UNWIND: + case ELF::SHT_MIPS_REGINFO: + case ELF::SHT_MIPS_OPTIONS: + case ELF::SHT_MIPS_ABIFLAGS: // Nothing to do. break; - case ELF::SHT_GROUP: { + case ELF::SHT_GROUP: sh_link = SymbolTableIndex; sh_info = GroupSymbolIndex; break; - } default: - assert(0 && "FIXME: sh_type value not supported!"); - break; + llvm_unreachable("FIXME: sh_type value not supported!"); } - WriteSecHdrEntry(SectionStringTableIndex[&Section], Section.getType(), + if (TargetObjectWriter->getEMachine() == ELF::EM_ARM && + Section.getType() == ELF::SHT_ARM_EXIDX) { + StringRef SecName(Section.getSectionName()); + if (SecName == ".ARM.exidx") { + sh_link = SectionIndexMap.lookup( + Asm.getContext().getELFSection(".text", + ELF::SHT_PROGBITS, + ELF::SHF_EXECINSTR | ELF::SHF_ALLOC, + SectionKind::getText())); + } else if (SecName.startswith(".ARM.exidx")) { + StringRef GroupName = + Section.getGroup() ? Section.getGroup()->getName() : ""; + sh_link = SectionIndexMap.lookup(Asm.getContext().getELFSection( + SecName.substr(sizeof(".ARM.exidx") - 1), ELF::SHT_PROGBITS, + ELF::SHF_EXECINSTR | ELF::SHF_ALLOC, SectionKind::getText(), 0, + GroupName)); + } + } + + WriteSecHdrEntry(ShStrTabBuilder.getOffset(Section.getSectionName()), + Section.getType(), Section.getFlags(), 0, Offset, Size, sh_link, sh_info, Alignment, Section.getEntrySize()); } @@ -1328,13 +1605,94 @@ uint64_t ELFObjectWriter::GetSectionAddressSize(const MCAsmLayout &Layout, return Layout.getSectionAddressSize(&SD); } -void ELFObjectWriter::WriteDataSectionData(ELFObjectWriter *W, - const MCSectionData &SD) { - for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e; - ++i) { - const MCFragment &F = *i; - assert(F.getKind() == MCFragment::FT_Data); - W->WriteBytes(cast(F).getContents().str()); +void ELFObjectWriter::WriteDataSectionData(MCAssembler &Asm, + const MCAsmLayout &Layout, + const MCSectionELF &Section) { + const MCSectionData &SD = Asm.getOrCreateSectionData(Section); + + uint64_t Padding = OffsetToAlignment(OS.tell(), SD.getAlignment()); + WriteZeros(Padding); + + if (IsELFMetaDataSection(SD)) { + for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e; + ++i) { + const MCFragment &F = *i; + assert(F.getKind() == MCFragment::FT_Data); + WriteBytes(cast(F).getContents()); + } + } else { + Asm.writeSectionData(&SD, Layout); + } +} + +void ELFObjectWriter::WriteSectionHeader(MCAssembler &Asm, + const GroupMapTy &GroupMap, + const MCAsmLayout &Layout, + const SectionIndexMapTy &SectionIndexMap, + const SectionOffsetMapTy &SectionOffsetMap) { + const unsigned NumSections = Asm.size() + 1; + + std::vector Sections; + Sections.resize(NumSections - 1); + + for (SectionIndexMapTy::const_iterator i= + SectionIndexMap.begin(), e = SectionIndexMap.end(); i != e; ++i) { + const std::pair &p = *i; + Sections[p.second - 1] = p.first; + } + + // Null section first. + uint64_t FirstSectionSize = + NumSections >= ELF::SHN_LORESERVE ? NumSections : 0; + uint32_t FirstSectionLink = + ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0; + WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0); + + for (unsigned i = 0; i < NumSections - 1; ++i) { + const MCSectionELF &Section = *Sections[i]; + const MCSectionData &SD = Asm.getOrCreateSectionData(Section); + uint32_t GroupSymbolIndex; + if (Section.getType() != ELF::SHT_GROUP) + GroupSymbolIndex = 0; + else + GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm, + GroupMap.lookup(&Section)); + + uint64_t Size = GetSectionAddressSize(Layout, SD); + + WriteSection(Asm, SectionIndexMap, GroupSymbolIndex, + SectionOffsetMap.lookup(&Section), Size, + SD.getAlignment(), Section); + } +} + +void ELFObjectWriter::ComputeSectionOrder(MCAssembler &Asm, + std::vector &Sections) { + for (MCAssembler::iterator it = Asm.begin(), + ie = Asm.end(); it != ie; ++it) { + const MCSectionELF &Section = + static_cast(it->getSection()); + if (Section.getType() == ELF::SHT_GROUP) + Sections.push_back(&Section); + } + + for (MCAssembler::iterator it = Asm.begin(), + ie = Asm.end(); it != ie; ++it) { + const MCSectionELF &Section = + static_cast(it->getSection()); + if (Section.getType() != ELF::SHT_GROUP && + Section.getType() != ELF::SHT_REL && + Section.getType() != ELF::SHT_RELA) + Sections.push_back(&Section); + } + + for (MCAssembler::iterator it = Asm.begin(), + ie = Asm.end(); it != ie; ++it) { + const MCSectionELF &Section = + static_cast(it->getSection()); + if (Section.getType() == ELF::SHT_REL || + Section.getType() == ELF::SHT_RELA) + Sections.push_back(&Section); } } @@ -1342,107 +1700,95 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout) { GroupMapTy GroupMap; RevGroupMapTy RevGroupMap; - CreateIndexedSections(Asm, const_cast(Layout), GroupMap, - RevGroupMap); - SectionIndexMapTy SectionIndexMap; - ComputeIndexMap(Asm, SectionIndexMap); + unsigned NumUserSections = Asm.size(); + + CompressDebugSections(Asm, const_cast(Layout)); + + DenseMap RelMap; + CreateRelocationSections(Asm, const_cast(Layout), RelMap); + + const unsigned NumUserAndRelocSections = Asm.size(); + CreateIndexedSections(Asm, const_cast(Layout), GroupMap, + RevGroupMap, SectionIndexMap, RelMap); + const unsigned AllSections = Asm.size(); + const unsigned NumIndexedSections = AllSections - NumUserAndRelocSections; + + unsigned NumRegularSections = NumUserSections + NumIndexedSections; // Compute symbol table information. - ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap); + computeSymbolTable(Asm, Layout, SectionIndexMap, RevGroupMap, + NumRegularSections); + + WriteRelocations(Asm, const_cast(Layout), RelMap); CreateMetadataSections(const_cast(Asm), const_cast(Layout), - SectionIndexMap); + SectionIndexMap, + RelMap); - // Update to include the metadata sections. - ComputeIndexMap(Asm, SectionIndexMap); - - // Add 1 for the null section. - unsigned NumSections = Asm.size() + 1; uint64_t NaturalAlignment = is64Bit() ? 8 : 4; uint64_t HeaderSize = is64Bit() ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); uint64_t FileOff = HeaderSize; std::vector Sections; - Sections.resize(NumSections); - - for (SectionIndexMapTy::const_iterator i= - SectionIndexMap.begin(), e = SectionIndexMap.end(); i != e; ++i) { - const std::pair &p = *i; - Sections[p.second] = p.first; - } - - for (unsigned i = 1; i < NumSections; ++i) { + ComputeSectionOrder(Asm, Sections); + unsigned NumSections = Sections.size(); + SectionOffsetMapTy SectionOffsetMap; + for (unsigned i = 0; i < NumRegularSections + 1; ++i) { const MCSectionELF &Section = *Sections[i]; const MCSectionData &SD = Asm.getOrCreateSectionData(Section); FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); + // Remember the offset into the file for this section. + SectionOffsetMap[&Section] = FileOff; + // Get the size of the section in the output file (including padding). FileOff += GetSectionFileSize(Layout, SD); } FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); - // Write out the ELF header ... - WriteHeader(FileOff - HeaderSize, NumSections); - - FileOff = HeaderSize; + const unsigned SectionHeaderOffset = FileOff - HeaderSize; - // ... then all of the sections ... - DenseMap SectionOffsetMap; + uint64_t SectionHeaderEntrySize = is64Bit() ? + sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr); + FileOff += (NumSections + 1) * SectionHeaderEntrySize; - for (unsigned i = 1; i < NumSections; ++i) { + for (unsigned i = NumRegularSections + 1; i < NumSections; ++i) { const MCSectionELF &Section = *Sections[i]; const MCSectionData &SD = Asm.getOrCreateSectionData(Section); - uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment()); - WriteZeros(Padding); - FileOff += Padding; + FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); // Remember the offset into the file for this section. SectionOffsetMap[&Section] = FileOff; + // Get the size of the section in the output file (including padding). FileOff += GetSectionFileSize(Layout, SD); - - if (IsELFMetaDataSection(SD)) - WriteDataSectionData(this, SD); - else - Asm.WriteSectionData(&SD, Layout); } - uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); - WriteZeros(Padding); - FileOff += Padding; + // Write out the ELF header ... + WriteHeader(Asm, SectionHeaderOffset, NumSections + 1); - // ... and then the section header table. - // Should we align the section header table? - // - // Null section first. - uint64_t FirstSectionSize = - NumSections >= ELF::SHN_LORESERVE ? NumSections : 0; - uint32_t FirstSectionLink = - ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0; - WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0); + // ... then the regular sections ... + // + because of .shstrtab + for (unsigned i = 0; i < NumRegularSections + 1; ++i) + WriteDataSectionData(Asm, Layout, *Sections[i]); - for (unsigned i = 1; i < NumSections; ++i) { - const MCSectionELF &Section = *Sections[i]; - const MCSectionData &SD = Asm.getOrCreateSectionData(Section); - uint32_t GroupSymbolIndex; - if (Section.getType() != ELF::SHT_GROUP) - GroupSymbolIndex = 0; - else - GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm, GroupMap[&Section]); + uint64_t Padding = OffsetToAlignment(OS.tell(), NaturalAlignment); + WriteZeros(Padding); - uint64_t Size = GetSectionAddressSize(Layout, SD); + // ... then the section header table ... + WriteSectionHeader(Asm, GroupMap, Layout, SectionIndexMap, + SectionOffsetMap); - WriteSection(Asm, SectionIndexMap, GroupSymbolIndex, - SectionOffsetMap[&Section], Size, - SD.getAlignment(), Section); - } + // ... and then the remaining sections ... + for (unsigned i = NumRegularSections + 1; i < NumSections; ++i) + WriteDataSectionData(Asm, Layout, *Sections[i]); } bool @@ -1451,7 +1797,7 @@ ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm, const MCFragment &FB, bool InSet, bool IsPCRel) const { - if (DataA.getFlags() & ELF_STB_Weak) + if (DataA.getFlags() & ELF_STB_Weak || MCELF::GetType(DataA) == ELF::STT_GNU_IFUNC) return false; return MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl( Asm, DataA, FB,InSet, IsPCRel); @@ -1460,397 +1806,5 @@ ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm, MCObjectWriter *llvm::createELFObjectWriter(MCELFObjectTargetWriter *MOTW, raw_ostream &OS, bool IsLittleEndian) { - switch (MOTW->getEMachine()) { - case ELF::EM_386: - case ELF::EM_X86_64: - return new X86ELFObjectWriter(MOTW, OS, IsLittleEndian); break; - case ELF::EM_ARM: - return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break; - case ELF::EM_MBLAZE: - return new MBlazeELFObjectWriter(MOTW, OS, IsLittleEndian); break; - default: llvm_unreachable("Unsupported architecture"); break; - } -} - - -/// START OF SUBCLASSES for ELFObjectWriter -//===- ARMELFObjectWriter -------------------------------------------===// - -ARMELFObjectWriter::ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian) - : ELFObjectWriter(MOTW, _OS, IsLittleEndian) -{} - -ARMELFObjectWriter::~ARMELFObjectWriter() -{} - -// FIXME: get the real EABI Version from the Triple. -void ARMELFObjectWriter::WriteEFlags() { - Write32(ELF::EF_ARM_EABIMASK & DefaultEABIVersion); -} - -// In ARM, _MergedGlobals and other most symbols get emitted directly. -// I.e. not as an offset to a section symbol. -// This code is a first-cut approximation of what ARM/gcc does. - -const MCSymbol *ARMELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm, - const MCValue &Target, - const MCFragment &F, - bool IsBSS) const { - const MCSymbol &Symbol = Target.getSymA()->getSymbol(); - bool EmitThisSym = false; - - if (IsBSS) { - EmitThisSym = StringSwitch(Symbol.getName()) - .Case("_MergedGlobals", true) - .Default(false); - } else { - EmitThisSym = StringSwitch(Symbol.getName()) - .Case("_MergedGlobals", true) - .StartsWith(".L.str", true) - .Default(false); - } - if (EmitThisSym) - return &Symbol; - if (! Symbol.isTemporary()) - return &Symbol; - return NULL; -} - -unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) { - MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ? - MCSymbolRefExpr::VK_None : Target.getSymA()->getKind(); - - unsigned Type = 0; - if (IsPCRel) { - switch ((unsigned)Fixup.getKind()) { - default: assert(0 && "Unimplemented"); - case FK_Data_4: - switch (Modifier) { - default: llvm_unreachable("Unsupported Modifier"); - case MCSymbolRefExpr::VK_None: - Type = ELF::R_ARM_BASE_PREL; - break; - case MCSymbolRefExpr::VK_ARM_TLSGD: - assert(0 && "unimplemented"); - break; - case MCSymbolRefExpr::VK_ARM_GOTTPOFF: - Type = ELF::R_ARM_TLS_IE32; - break; - } - break; - case ARM::fixup_arm_uncondbranch: - switch (Modifier) { - case MCSymbolRefExpr::VK_ARM_PLT: - Type = ELF::R_ARM_PLT32; - break; - default: - Type = ELF::R_ARM_CALL; - break; - } - break; - case ARM::fixup_arm_condbranch: - Type = ELF::R_ARM_JUMP24; - break; - case ARM::fixup_arm_movt_hi16: - case ARM::fixup_arm_movt_hi16_pcrel: - Type = ELF::R_ARM_MOVT_PREL; - break; - case ARM::fixup_arm_movw_lo16: - case ARM::fixup_arm_movw_lo16_pcrel: - Type = ELF::R_ARM_MOVW_PREL_NC; - break; - case ARM::fixup_t2_movt_hi16: - case ARM::fixup_t2_movt_hi16_pcrel: - Type = ELF::R_ARM_THM_MOVT_PREL; - break; - case ARM::fixup_t2_movw_lo16: - case ARM::fixup_t2_movw_lo16_pcrel: - Type = ELF::R_ARM_THM_MOVW_PREL_NC; - break; - } - } else { - switch ((unsigned)Fixup.getKind()) { - default: llvm_unreachable("invalid fixup kind!"); - case FK_Data_4: - switch (Modifier) { - default: llvm_unreachable("Unsupported Modifier"); break; - case MCSymbolRefExpr::VK_ARM_GOT: - Type = ELF::R_ARM_GOT_BREL; - break; - case MCSymbolRefExpr::VK_ARM_TLSGD: - Type = ELF::R_ARM_TLS_GD32; - break; - case MCSymbolRefExpr::VK_ARM_TPOFF: - Type = ELF::R_ARM_TLS_LE32; - break; - case MCSymbolRefExpr::VK_ARM_GOTTPOFF: - Type = ELF::R_ARM_TLS_IE32; - break; - case MCSymbolRefExpr::VK_None: - Type = ELF::R_ARM_ABS32; - break; - case MCSymbolRefExpr::VK_ARM_GOTOFF: - Type = ELF::R_ARM_GOTOFF32; - break; - } - break; - case ARM::fixup_arm_ldst_pcrel_12: - case ARM::fixup_arm_pcrel_10: - case ARM::fixup_arm_adr_pcrel_12: - case ARM::fixup_arm_thumb_bl: - case ARM::fixup_arm_thumb_cb: - case ARM::fixup_arm_thumb_cp: - case ARM::fixup_arm_thumb_br: - assert(0 && "Unimplemented"); - break; - case ARM::fixup_arm_uncondbranch: - Type = ELF::R_ARM_CALL; - break; - case ARM::fixup_arm_condbranch: - Type = ELF::R_ARM_JUMP24; - break; - case ARM::fixup_arm_movt_hi16: - Type = ELF::R_ARM_MOVT_ABS; - break; - case ARM::fixup_arm_movw_lo16: - Type = ELF::R_ARM_MOVW_ABS_NC; - break; - case ARM::fixup_t2_movt_hi16: - Type = ELF::R_ARM_THM_MOVT_ABS; - break; - case ARM::fixup_t2_movw_lo16: - Type = ELF::R_ARM_THM_MOVW_ABS_NC; - break; - } - } - - if (RelocNeedsGOT(Modifier)) - NeedsGOT = true; - - return Type; -} - -//===- MBlazeELFObjectWriter -------------------------------------------===// - -MBlazeELFObjectWriter::MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian) - : ELFObjectWriter(MOTW, _OS, IsLittleEndian) { -} - -MBlazeELFObjectWriter::~MBlazeELFObjectWriter() { -} - -unsigned MBlazeELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) { - // determine the type of the relocation - unsigned Type; - if (IsPCRel) { - switch ((unsigned)Fixup.getKind()) { - default: - llvm_unreachable("Unimplemented"); - case FK_PCRel_4: - Type = ELF::R_MICROBLAZE_64_PCREL; - break; - case FK_PCRel_2: - Type = ELF::R_MICROBLAZE_32_PCREL; - break; - } - } else { - switch ((unsigned)Fixup.getKind()) { - default: llvm_unreachable("invalid fixup kind!"); - case FK_Data_4: - Type = ((IsRelocWithSymbol || Addend !=0) - ? ELF::R_MICROBLAZE_32 - : ELF::R_MICROBLAZE_64); - break; - case FK_Data_2: - Type = ELF::R_MICROBLAZE_32; - break; - } - } - return Type; -} - -//===- X86ELFObjectWriter -------------------------------------------===// - - -X86ELFObjectWriter::X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian) - : ELFObjectWriter(MOTW, _OS, IsLittleEndian) -{} - -X86ELFObjectWriter::~X86ELFObjectWriter() -{} - -unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) { - // determine the type of the relocation - - MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ? - MCSymbolRefExpr::VK_None : Target.getSymA()->getKind(); - unsigned Type; - if (is64Bit()) { - if (IsPCRel) { - switch ((unsigned)Fixup.getKind()) { - default: llvm_unreachable("invalid fixup kind!"); - case FK_PCRel_8: - assert(Modifier == MCSymbolRefExpr::VK_None); - Type = ELF::R_X86_64_PC64; - break; - case X86::reloc_signed_4byte: - case X86::reloc_riprel_4byte_movq_load: - case FK_Data_4: // FIXME? - case X86::reloc_riprel_4byte: - case FK_PCRel_4: - switch (Modifier) { - default: - llvm_unreachable("Unimplemented"); - case MCSymbolRefExpr::VK_None: - Type = ELF::R_X86_64_PC32; - break; - case MCSymbolRefExpr::VK_PLT: - Type = ELF::R_X86_64_PLT32; - break; - case MCSymbolRefExpr::VK_GOTPCREL: - Type = ELF::R_X86_64_GOTPCREL; - break; - case MCSymbolRefExpr::VK_GOTTPOFF: - Type = ELF::R_X86_64_GOTTPOFF; - break; - case MCSymbolRefExpr::VK_TLSGD: - Type = ELF::R_X86_64_TLSGD; - break; - case MCSymbolRefExpr::VK_TLSLD: - Type = ELF::R_X86_64_TLSLD; - break; - } - break; - case FK_PCRel_2: - assert(Modifier == MCSymbolRefExpr::VK_None); - Type = ELF::R_X86_64_PC16; - break; - case FK_PCRel_1: - assert(Modifier == MCSymbolRefExpr::VK_None); - Type = ELF::R_X86_64_PC8; - break; - } - } else { - switch ((unsigned)Fixup.getKind()) { - default: llvm_unreachable("invalid fixup kind!"); - case FK_Data_8: Type = ELF::R_X86_64_64; break; - case X86::reloc_signed_4byte: - assert(isInt<32>(Target.getConstant())); - switch (Modifier) { - default: - llvm_unreachable("Unimplemented"); - case MCSymbolRefExpr::VK_None: - Type = ELF::R_X86_64_32S; - break; - case MCSymbolRefExpr::VK_GOT: - Type = ELF::R_X86_64_GOT32; - break; - case MCSymbolRefExpr::VK_GOTPCREL: - Type = ELF::R_X86_64_GOTPCREL; - break; - case MCSymbolRefExpr::VK_TPOFF: - Type = ELF::R_X86_64_TPOFF32; - break; - case MCSymbolRefExpr::VK_DTPOFF: - Type = ELF::R_X86_64_DTPOFF32; - break; - } - break; - case FK_Data_4: - Type = ELF::R_X86_64_32; - break; - case FK_Data_2: Type = ELF::R_X86_64_16; break; - case FK_PCRel_1: - case FK_Data_1: Type = ELF::R_X86_64_8; break; - } - } - } else { - if (IsPCRel) { - switch (Modifier) { - default: - llvm_unreachable("Unimplemented"); - case MCSymbolRefExpr::VK_None: - Type = ELF::R_386_PC32; - break; - case MCSymbolRefExpr::VK_PLT: - Type = ELF::R_386_PLT32; - break; - } - } else { - switch ((unsigned)Fixup.getKind()) { - default: llvm_unreachable("invalid fixup kind!"); - - case X86::reloc_global_offset_table: - Type = ELF::R_386_GOTPC; - break; - - // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode - // instead? - case X86::reloc_signed_4byte: - case FK_PCRel_4: - case FK_Data_4: - switch (Modifier) { - default: - llvm_unreachable("Unimplemented"); - case MCSymbolRefExpr::VK_None: - Type = ELF::R_386_32; - break; - case MCSymbolRefExpr::VK_GOT: - Type = ELF::R_386_GOT32; - break; - case MCSymbolRefExpr::VK_GOTOFF: - Type = ELF::R_386_GOTOFF; - break; - case MCSymbolRefExpr::VK_TLSGD: - Type = ELF::R_386_TLS_GD; - break; - case MCSymbolRefExpr::VK_TPOFF: - Type = ELF::R_386_TLS_LE_32; - break; - case MCSymbolRefExpr::VK_INDNTPOFF: - Type = ELF::R_386_TLS_IE; - break; - case MCSymbolRefExpr::VK_NTPOFF: - Type = ELF::R_386_TLS_LE; - break; - case MCSymbolRefExpr::VK_GOTNTPOFF: - Type = ELF::R_386_TLS_GOTIE; - break; - case MCSymbolRefExpr::VK_TLSLDM: - Type = ELF::R_386_TLS_LDM; - break; - case MCSymbolRefExpr::VK_DTPOFF: - Type = ELF::R_386_TLS_LDO_32; - break; - } - break; - case FK_Data_2: Type = ELF::R_386_16; break; - case FK_PCRel_1: - case FK_Data_1: Type = ELF::R_386_8; break; - } - } - } - - if (RelocNeedsGOT(Modifier)) - NeedsGOT = true; - - return Type; + return new ELFObjectWriter(MOTW, OS, IsLittleEndian); }