X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FELFObjectWriter.cpp;h=a193d165e96b40f16c0ae3e636f3a4c3d77da5c8;hb=e246717c3a36a913fd4200776ed621649bb2b624;hp=dbe0dd870f69da0ad0f0f1802ffb5edceb22fd31;hpb=1973d4379250a88938a9358c12d96e96bdc8dede;p=oota-llvm.git diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp index dbe0dd870f6..a193d165e96 100644 --- a/lib/MC/ELFObjectWriter.cpp +++ b/lib/MC/ELFObjectWriter.cpp @@ -11,7 +11,6 @@ // //===----------------------------------------------------------------------===// -#include "llvm/MC/ELFObjectWriter.h" #include "llvm/ADT/SmallPtrSet.h" #include "llvm/ADT/STLExtras.h" #include "llvm/ADT/StringMap.h" @@ -31,6 +30,7 @@ #include "llvm/Target/TargetAsmBackend.h" #include "../Target/X86/X86FixupKinds.h" +#include "../Target/ARM/ARMFixupKinds.h" #include using namespace llvm; @@ -66,17 +66,6 @@ static unsigned GetVisibility(MCSymbolData &SD) { return Visibility; } -static bool isFixupKindX86PCRel(unsigned Kind) { - switch (Kind) { - default: - return false; - case X86::reloc_pcrel_1byte: - case X86::reloc_pcrel_4byte: - case X86::reloc_riprel_4byte: - case X86::reloc_riprel_4byte_movq_load: - return true; - } -} static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) { switch (Variant) { @@ -99,8 +88,8 @@ static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) { } namespace { - - class ELFObjectWriterImpl { + class ELFObjectWriter : public MCObjectWriter { + protected: /*static bool isFixupKindX86RIPRel(unsigned Kind) { return Kind == X86::reloc_riprel_4byte || Kind == X86::reloc_riprel_4byte_movq_load; @@ -136,6 +125,15 @@ namespace { 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; @@ -143,6 +141,7 @@ namespace { }; SmallPtrSet UsedInReloc; + SmallPtrSet WeakrefUsedInReloc; DenseMap Renames; llvm::DenseMapgetStream()), + ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian, + uint16_t _EMachine, bool _HasRelAddend, + Triple::OSType _OSType) + : MCObjectWriter(_OS, IsLittleEndian), + NeedsGOT(false), NeedsSymtabShndx(false), Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend), OSType(_OSType), EMachine(_EMachine) { } - void Write8(uint8_t Value) { Writer->Write8(Value); } - void Write16(uint16_t Value) { Writer->Write16(Value); } - void Write32(uint32_t Value) { Writer->Write32(Value); } - //void Write64(uint64_t Value) { Writer->Write64(Value); } - void WriteZeros(unsigned N) { Writer->WriteZeros(N); } - //void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) { - // Writer->WriteBytes(Str, ZeroFillSize); - //} + virtual ~ELFObjectWriter(); void WriteWord(uint64_t W) { if (Is64Bit) - Writer->Write64(W); + Write64(W); else - Writer->Write32(W); - } - - void String8(char *buf, uint8_t Value) { - buf[0] = Value; + Write32(W); } void StringLE16(char *buf, uint16_t Value) { @@ -242,89 +234,218 @@ namespace { StringBE32(buf + 4, uint32_t(Value >> 0)); } - void String16(char *buf, uint16_t Value) { - if (Writer->isLittleEndian()) + void String8(MCDataFragment &F, uint8_t Value) { + char buf[1]; + buf[0] = Value; + F.getContents() += StringRef(buf, 1); + } + + 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(char *buf, uint32_t Value) { - if (Writer->isLittleEndian()) + 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(char *buf, uint64_t Value) { - if (Writer->isLittleEndian()) + void String64(MCDataFragment &F, uint64_t Value) { + char buf[8]; + if (isLittleEndian()) StringLE64(buf, Value); else StringBE64(buf, Value); + F.getContents() += StringRef(buf, 8); } - void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); + virtual void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); - void WriteSymbolEntry(MCDataFragment *F, uint64_t name, uint8_t info, + virtual void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF, + uint64_t name, uint8_t info, uint64_t value, uint64_t size, - uint8_t other, uint16_t shndx); + uint8_t other, uint32_t shndx, + bool Reserved); - void WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, + virtual void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF, + ELFSymbolData &MSD, const MCAsmLayout &Layout); - void WriteSymbolTable(MCDataFragment *F, const MCAssembler &Asm, + typedef DenseMap SectionIndexMapTy; + virtual void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF, + const MCAssembler &Asm, const MCAsmLayout &Layout, - unsigned NumRegularSections); + const SectionIndexMapTy &SectionIndexMap); - void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, - const MCFragment *Fragment, const MCFixup &Fixup, - MCValue Target, uint64_t &FixedValue); + virtual void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, + const MCFragment *Fragment, const MCFixup &Fixup, + MCValue Target, uint64_t &FixedValue); - uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, + virtual 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; + /// ComputeSymbolTable - 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. - void ComputeSymbolTable(MCAssembler &Asm); + virtual void ComputeSymbolTable(MCAssembler &Asm, + const SectionIndexMapTy &SectionIndexMap, + RevGroupMapTy RevGroupMap); + + virtual void ComputeIndexMap(MCAssembler &Asm, + SectionIndexMapTy &SectionIndexMap); - void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, + virtual void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, const MCSectionData &SD); - void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { + 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 CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout); + virtual void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout, + const SectionIndexMapTy &SectionIndexMap); - void ExecutePostLayoutBinding(MCAssembler &Asm); + virtual void CreateGroupSections(MCAssembler &Asm, MCAsmLayout &Layout, + GroupMapTy &GroupMap, RevGroupMapTy &RevGroupMap); - void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, + virtual void ExecutePostLayoutBinding(MCAssembler &Asm, + const MCAsmLayout &Layout); + + virtual 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); - void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, + virtual void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, const MCSectionData *SD); - bool IsFixupFullyResolved(const MCAssembler &Asm, + virtual bool IsFixupFullyResolved(const MCAssembler &Asm, const MCValue Target, bool IsPCRel, const MCFragment *DF) const; - void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); + virtual void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); + virtual 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; + + virtual bool isFixupKindPCRel(unsigned Kind) const = 0; + }; + + //===- X86ELFObjectWriter -------------------------------------------===// + + class X86ELFObjectWriter : public ELFObjectWriter { + public: + X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian, + uint16_t _EMachine, bool _HasRelAddend, + Triple::OSType _OSType); + + virtual ~X86ELFObjectWriter(); + protected: + virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, + bool IsPCRel, bool IsRelocWithSymbol, + int64_t Addend); + + virtual bool isFixupKindPCRel(unsigned Kind) const { + switch (Kind) { + default: + return false; + case FK_PCRel_1: + case FK_PCRel_2: + case FK_PCRel_4: + case X86::reloc_riprel_4byte: + case X86::reloc_riprel_4byte_movq_load: + return true; + } + } + }; + + + //===- ARMELFObjectWriter -------------------------------------------===// + + class ARMELFObjectWriter : public ELFObjectWriter { + public: + ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian, + uint16_t _EMachine, bool _HasRelAddend, + Triple::OSType _OSType); + + virtual ~ARMELFObjectWriter(); + protected: + virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, + bool IsPCRel, bool IsRelocWithSymbol, + int64_t Addend); + virtual bool isFixupKindPCRel(unsigned Kind) const { + switch (Kind) { + default: + return false; + case FK_PCRel_1: + case FK_PCRel_2: + case FK_PCRel_4: + case ARM::fixup_arm_ldst_pcrel_12: + case ARM::fixup_arm_pcrel_10: + case ARM::fixup_arm_branch: + return true; + } + } }; + //===- MBlazeELFObjectWriter -------------------------------------------===// + + class MBlazeELFObjectWriter : public ELFObjectWriter { + public: + MBlazeELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian, + uint16_t _EMachine, bool _HasRelAddend, + Triple::OSType _OSType); + + virtual ~MBlazeELFObjectWriter(); + protected: + virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, + bool IsPCRel, bool IsRelocWithSymbol, + int64_t Addend); + + virtual bool isFixupKindPCRel(unsigned Kind) const { + switch (Kind) { + default: + return false; + case FK_PCRel_1: + case FK_PCRel_2: + case FK_PCRel_4: + return true; + } + } + }; } +ELFObjectWriter::~ELFObjectWriter() +{} + // Emit the ELF header. -void ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, - unsigned NumberOfSections) { +void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, + unsigned NumberOfSections) { // ELF Header // ---------- // @@ -341,7 +462,7 @@ void ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] // e_ident[EI_DATA] - Write8(Writer->isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); + Write8(isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] // e_ident[EI_OSABI] @@ -377,56 +498,49 @@ void ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); // e_shnum = # of section header ents - Write16(NumberOfSections); + if (NumberOfSections >= ELF::SHN_LORESERVE) + Write16(0); + else + Write16(NumberOfSections); // e_shstrndx = Section # of '.shstrtab' - Write16(ShstrtabIndex); + if (NumberOfSections >= ELF::SHN_LORESERVE) + Write16(ELF::SHN_XINDEX); + else + Write16(ShstrtabIndex); } -void ELFObjectWriterImpl::WriteSymbolEntry(MCDataFragment *F, uint64_t name, - uint8_t info, uint64_t value, - uint64_t size, uint8_t other, - uint16_t shndx) { - if (Is64Bit) { - char buf[8]; - - String32(buf, name); - F->getContents() += StringRef(buf, 4); // st_name - - String8(buf, info); - F->getContents() += StringRef(buf, 1); // st_info - - String8(buf, other); - F->getContents() += StringRef(buf, 1); // st_other - - String16(buf, shndx); - F->getContents() += StringRef(buf, 2); // st_shndx +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); + } - String64(buf, value); - F->getContents() += StringRef(buf, 8); // st_value + uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ? + uint16_t(ELF::SHN_XINDEX) : shndx; - String64(buf, size); - F->getContents() += StringRef(buf, 8); // st_size + 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 { - char buf[4]; - - String32(buf, name); - F->getContents() += StringRef(buf, 4); // st_name - - String32(buf, value); - F->getContents() += StringRef(buf, 4); // st_value - - String32(buf, size); - F->getContents() += StringRef(buf, 4); // st_size - - String8(buf, info); - F->getContents() += StringRef(buf, 1); // st_info - - String8(buf, other); - F->getContents() += StringRef(buf, 1); // st_other - - String16(buf, shndx); - F->getContents() += StringRef(buf, 2); // st_shndx + 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 } } @@ -438,44 +552,23 @@ static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { if (!Symbol.isInSection()) return 0; - if (MCFragment *FF = Data.getFragment()) - return Layout.getSymbolAddress(&Data) - - Layout.getSectionAddress(FF->getParent()); + if (Data.getFragment()) + return Layout.getSymbolOffset(&Data); return 0; } -static const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) { - const MCSymbol *S = &Symbol; - while (S->isVariable()) { - const MCExpr *Value = S->getVariableValue(); - if (Value->getKind() != MCExpr::SymbolRef) - return *S; - const MCSymbolRefExpr *Ref = static_cast(Value); - S = &Ref->getSymbol(); - } - return *S; -} - -void ELFObjectWriterImpl::ExecutePostLayoutBinding(MCAssembler &Asm) { +void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm, + const MCAsmLayout &Layout) { // 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 = AliasedSymbol(Alias); + const MCSymbol &Symbol = Alias.AliasedSymbol(); MCSymbolData &SD = Asm.getSymbolData(Symbol); - // Undefined symbols are global, but this is the first place we - // are able to set it. - if (Symbol.isUndefined() && !Symbol.isVariable()) { - if (GetBinding(SD) == ELF::STB_LOCAL) { - SetBinding(SD, ELF::STB_GLOBAL); - SetBinding(*it, ELF::STB_GLOBAL); - } - } - // Not an alias. if (&Symbol == &Alias) continue; @@ -503,11 +596,16 @@ void ELFObjectWriterImpl::ExecutePostLayoutBinding(MCAssembler &Asm) { } } -void ELFObjectWriterImpl::WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, - const MCAsmLayout &Layout) { +void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, + MCDataFragment *ShndxF, + ELFSymbolData &MSD, + const MCAsmLayout &Layout) { MCSymbolData &OrigData = *MSD.SymbolData; MCSymbolData &Data = - Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol())); + Layout.getAssembler().getSymbolData(OrigData.getSymbol().AliasedSymbol()); + + bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() || + Data.getSymbol().isVariable(); uint8_t Binding = GetBinding(OrigData); uint8_t Visibility = GetVisibility(OrigData); @@ -541,14 +639,15 @@ void ELFObjectWriterImpl::WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, } // Write out the symbol table entry - WriteSymbolEntry(F, MSD.StringIndex, Info, Value, - Size, Other, MSD.SectionIndex); + WriteSymbolEntry(SymtabF, ShndxF, MSD.StringIndex, Info, Value, + Size, Other, MSD.SectionIndex, IsReserved); } -void ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *F, - const MCAssembler &Asm, - const MCAsmLayout &Layout, - unsigned NumRegularSections) { +void ELFObjectWriter::WriteSymbolTable(MCDataFragment *SymtabF, + MCDataFragment *ShndxF, + const MCAssembler &Asm, + const MCAsmLayout &Layout, + const 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"); @@ -556,27 +655,27 @@ void ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *F, // FIXME: Make sure the start of the symbol table is aligned. // The first entry is the undefined symbol entry. - unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; - F->getContents().append(EntrySize, '\x00'); + WriteSymbolEntry(SymtabF, ShndxF, 0, 0, 0, 0, 0, 0, false); // Write the symbol table entries. LastLocalSymbolIndex = LocalSymbolData.size() + 1; for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { ELFSymbolData &MSD = LocalSymbolData[i]; - WriteSymbol(F, MSD, Layout); + WriteSymbol(SymtabF, ShndxF, MSD, Layout); } // Write out a symbol table entry for each regular section. - unsigned Index = 1; - for (MCAssembler::const_iterator it = Asm.begin(); - Index <= NumRegularSections; ++it, ++Index) { + for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; + ++i) { const MCSectionELF &Section = - static_cast(it->getSection()); - // Leave out relocations so we don't have indexes within - // the relocations messed up - if (Section.getType() == ELF::SHT_RELA || Section.getType() == ELF::SHT_REL) + 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(F, 0, ELF::STT_SECTION, 0, 0, ELF::STV_DEFAULT, Index); + WriteSymbolEntry(SymtabF, ShndxF, 0, ELF::STT_SECTION, 0, 0, + ELF::STV_DEFAULT, SectionIndexMap.lookup(&Section), false); LastLocalSymbolIndex++; } @@ -586,7 +685,7 @@ void ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *F, assert(((Data.getFlags() & ELF_STB_Global) || (Data.getFlags() & ELF_STB_Weak)) && "External symbol requires STB_GLOBAL or STB_WEAK flag"); - WriteSymbol(F, MSD, Layout); + WriteSymbol(SymtabF, ShndxF, MSD, Layout); if (GetBinding(Data) == ELF::STB_LOCAL) LastLocalSymbolIndex++; } @@ -594,98 +693,113 @@ void ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *F, for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { ELFSymbolData &MSD = UndefinedSymbolData[i]; MCSymbolData &Data = *MSD.SymbolData; - WriteSymbol(F, MSD, Layout); + WriteSymbol(SymtabF, ShndxF, MSD, Layout); if (GetBinding(Data) == ELF::STB_LOCAL) LastLocalSymbolIndex++; } } -static bool ShouldRelocOnSymbol(const MCSymbolData &SD, - const MCValue &Target, - const MCFragment &F) { - const MCSymbol &Symbol = SD.getSymbol(); - if (Symbol.isUndefined()) - return true; +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; + } + + if (SD.isExternal()) { + if (Renamed) + return Renamed; + return &Symbol; + } const MCSectionELF &Section = - static_cast(Symbol.getSection()); + static_cast(ASymbol.getSection()); + const SectionKind secKind = Section.getKind(); - if (SD.isExternal()) - return true; + if (secKind.isBSS()) + return NULL; + + if (secKind.isThreadLocal()) { + if (Renamed) + return Renamed; + return &Symbol; + } MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); const MCSectionELF &Sec2 = static_cast(F.getParent()->getSection()); - if (Section.getKind().isBSS()) - return false; - if (&Sec2 != &Section && (Kind == MCSymbolRefExpr::VK_PLT || Kind == MCSymbolRefExpr::VK_GOTPCREL || - Kind == MCSymbolRefExpr::VK_GOTOFF)) - return true; + Kind == MCSymbolRefExpr::VK_GOTOFF)) { + if (Renamed) + return Renamed; + return &Symbol; + } - if (Section.getFlags() & MCSectionELF::SHF_MERGE) - return Target.getConstant() != 0; + if (Section.getFlags() & MCSectionELF::SHF_MERGE) { + if (Target.getConstant() == 0) + return NULL; + if (Renamed) + return Renamed; + return &Symbol; + } - return false; + return NULL; } -// FIXME: this is currently X86/X86_64 only -void ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm, - const MCAsmLayout &Layout, - const MCFragment *Fragment, - const MCFixup &Fixup, - MCValue Target, - uint64_t &FixedValue) { + +void ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, + const MCAsmLayout &Layout, + const MCFragment *Fragment, + const MCFixup &Fixup, + MCValue Target, + uint64_t &FixedValue) { int64_t Addend = 0; int Index = 0; int64_t Value = Target.getConstant(); - const MCSymbol *Symbol = 0; - const MCSymbol *Renamed = 0; + const MCSymbol *RelocSymbol = NULL; - bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind()); + bool IsPCRel = isFixupKindPCRel(Fixup.getKind()); if (!Target.isAbsolute()) { - Symbol = &AliasedSymbol(Target.getSymA()->getSymbol()); - Renamed = Renames.lookup(Symbol); - if (!Renamed) - Renamed = Symbol; - MCSymbolData &SD = Asm.getSymbolData(*Symbol); - MCFragment *F = SD.getFragment(); + 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; - MCSectionData *Sec = Fragment->getParent(); // Offset of the symbol in the section - int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec); + int64_t a = Layout.getSymbolOffset(&SDB); // Ofeset of the relocation in the section int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); Value += b - a; } - // Check that this case has already been fully resolved before we get - // here. - if (Symbol->isDefined() && !SD.isExternal() && - IsPCRel && - &Fragment->getParent()->getSection() == &Symbol->getSection()) { - llvm_unreachable("We don't need a relocation in this case."); - return; - } + if (!RelocSymbol) { + MCSymbolData &SD = Asm.getSymbolData(ASymbol); + MCFragment *F = SD.getFragment(); - bool RelocOnSymbol = ShouldRelocOnSymbol(SD, Target, *Fragment); - if (!RelocOnSymbol) { - Index = F->getParent()->getOrdinal(); + Index = F->getParent()->getOrdinal() + 1; - MCSectionData *FSD = F->getParent(); // Offset of the symbol in the section - Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD); + Value += Layout.getSymbolOffset(&SD); } else { - UsedInReloc.insert(Renamed); + if (Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref) + WeakrefUsedInReloc.insert(RelocSymbol); + else + UsedInReloc.insert(RelocSymbol); Index = -1; } Addend = Value; @@ -695,171 +809,30 @@ void ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm, } FixedValue = Value; - - // determine the type of the relocation - - MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); - unsigned Type; - if (Is64Bit) { - if (IsPCRel) { - 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; - } - } 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: - case X86::reloc_pcrel_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 X86::reloc_pcrel_1byte: - 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 X86::reloc_pcrel_4byte: - 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 X86::reloc_pcrel_1byte: - case FK_Data_1: Type = ELF::R_386_8; break; - } - } - } - - if (RelocNeedsGOT(Modifier)) - NeedsGOT = true; - - ELFRelocationEntry ERE; - - ERE.Index = Index; - ERE.Type = Type; - ERE.Symbol = Renamed; - - ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); - - if (HasRelocationAddend) - ERE.r_addend = Addend; - else - ERE.r_addend = 0; // Silence compiler warning. - + unsigned Type = GetRelocType(Target, Fixup, IsPCRel, + (RelocSymbol != 0), Addend); + + uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) + + Fixup.getOffset(); + + if (!HasRelocationAddend) Addend = 0; + ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend); Relocations[Fragment->getParent()].push_back(ERE); } + uint64_t -ELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm, - const MCSymbol *S) { +ELFObjectWriter::getSymbolIndexInSymbolTable(const MCAssembler &Asm, + const MCSymbol *S) { MCSymbolData &SD = Asm.getSymbolData(*S); - - // Local symbol. - if (!SD.isExternal() && !S->isUndefined()) - return SD.getIndex() + /* empty symbol */ 1; - - // External or undefined symbol. - return SD.getIndex() + NumRegularSections + /* empty symbol */ 1; + return SD.getIndex(); } static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, bool Used, bool Renamed) { + if (Data.getFlags() & ELF_Other_Weakref) + return false; + if (Used) return true; @@ -868,8 +841,11 @@ static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, const MCSymbol &Symbol = Data.getSymbol(); - const MCSymbol &A = AliasedSymbol(Symbol); - if (&A != &Symbol && A.isUndefined()) + if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_") + return true; + + const MCSymbol &A = Symbol.AliasedSymbol(); + if (!A.isVariable() && A.isUndefined() && !Data.isCommon()) return false; if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined()) @@ -881,18 +857,49 @@ static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, return true; } -static bool isLocal(const MCSymbolData &Data) { +static bool isLocal(const MCSymbolData &Data, bool isSignature, + bool isUsedInReloc) { if (Data.isExternal()) return false; const MCSymbol &Symbol = Data.getSymbol(); - if (Symbol.isUndefined() && !Symbol.isVariable()) + const MCSymbol &RefSymbol = Symbol.AliasedSymbol(); + + if (RefSymbol.isUndefined() && !RefSymbol.isVariable()) { + if (isSignature && !isUsedInReloc) + return true; + return false; + } return true; } -void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { +void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, + SectionIndexMapTy &SectionIndexMap) { + unsigned Index = 1; + 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) + continue; + SectionIndexMap[&Section] = Index++; + } + + 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) + continue; + SectionIndexMap[&Section] = Index++; + } +} + +void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, + const SectionIndexMapTy &SectionIndexMap, + RevGroupMapTy RevGroupMap) { // FIXME: Is this the correct place to do this? if (NeedsGOT) { llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_"; @@ -903,12 +910,7 @@ void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { } // Build section lookup table. - NumRegularSections = Asm.size(); - DenseMap SectionIndexMap; - unsigned Index = 1; - for (MCAssembler::iterator it = Asm.begin(), - ie = Asm.end(); it != ie; ++it, ++Index) - SectionIndexMap[&it->getSection()] = Index; + int NumRegularSections = Asm.size(); // Index 0 is always the empty string. StringMap StringIndexMap; @@ -919,14 +921,30 @@ void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { ie = Asm.symbol_end(); it != ie; ++it) { const MCSymbol &Symbol = it->getSymbol(); - if (!isInSymtab(Asm, *it, UsedInReloc.count(&Symbol), + bool Used = UsedInReloc.count(&Symbol); + bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol); + bool isSignature = RevGroupMap.count(&Symbol); + + if (!isInSymtab(Asm, *it, + Used || WeakrefUsed || isSignature, Renames.count(&Symbol))) continue; ELFSymbolData MSD; MSD.SymbolData = it; - bool Local = isLocal(*it); - const MCSymbol &RefSymbol = AliasedSymbol(Symbol); + const MCSymbol &RefSymbol = Symbol.AliasedSymbol(); + + // Undefined symbols are global, but this is the first place we + // are able to set it. + bool Local = isLocal(*it, isSignature, Used); + if (!Local && GetBinding(*it) == ELF::STB_LOCAL) { + MCSymbolData &SD = Asm.getSymbolData(RefSymbol); + SetBinding(*it, ELF::STB_GLOBAL); + SetBinding(SD, ELF::STB_GLOBAL); + } + + if (RefSymbol.isUndefined() && !Used && WeakrefUsed) + SetBinding(*it, ELF::STB_WEAK); if (it->isCommon()) { assert(!Local); @@ -934,30 +952,36 @@ void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { MSD.SectionIndex = ELF::SHN_ABS; } else if (RefSymbol.isUndefined()) { - MSD.SectionIndex = ELF::SHN_UNDEF; + if (isSignature && !Used) + MSD.SectionIndex = SectionIndexMap.lookup(RevGroupMap[&Symbol]); + else + MSD.SectionIndex = ELF::SHN_UNDEF; } else { - MSD.SectionIndex = SectionIndexMap.lookup(&RefSymbol.getSection()); + const MCSectionELF &Section = + static_cast(RefSymbol.getSection()); + MSD.SectionIndex = SectionIndexMap.lookup(&Section); + if (MSD.SectionIndex >= ELF::SHN_LORESERVE) + NeedsSymtabShndx = true; assert(MSD.SectionIndex && "Invalid section index!"); } // The @@@ in symbol version is replaced with @ in undefined symbols and // @@ in defined ones. StringRef Name = Symbol.getName(); + SmallString<32> Buf; + size_t Pos = Name.find("@@@"); - std::string FinalName; if (Pos != StringRef::npos) { - StringRef Prefix = Name.substr(0, Pos); - unsigned n = MSD.SectionIndex == ELF::SHN_UNDEF ? 2 : 1; - StringRef Suffix = Name.substr(Pos + n); - FinalName = Prefix.str() + Suffix.str(); - } else { - FinalName = Name.str(); + Buf += Name.substr(0, Pos); + unsigned Skip = MSD.SectionIndex == ELF::SHN_UNDEF ? 2 : 1; + Buf += Name.substr(Pos + Skip); + Name = Buf; } - uint64_t &Entry = StringIndexMap[FinalName]; + uint64_t &Entry = StringIndexMap[Name]; if (!Entry) { Entry = StringTable.size(); - StringTable += FinalName; + StringTable += Name; StringTable += '\x00'; } MSD.StringIndex = Entry; @@ -976,20 +1000,23 @@ void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { // Set the symbol indices. Local symbols must come before all other // symbols with non-local bindings. - Index = 0; + unsigned Index = 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 ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, - const MCSectionData &SD) { +void ELFObjectWriter::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, + const MCSectionData &SD) { if (!Relocations[&SD].empty()) { MCContext &Ctx = Asm.getContext(); - const MCSection *RelaSection; + const MCSectionELF *RelaSection; const MCSectionELF &Section = static_cast(SD.getSection()); @@ -1006,7 +1033,7 @@ void ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ? ELF::SHT_RELA : ELF::SHT_REL, 0, SectionKind::getReadOnly(), - false, EntrySize); + EntrySize, ""); MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); RelaSD.setAlignment(Is64Bit ? 8 : 4); @@ -1014,17 +1041,15 @@ void ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, MCDataFragment *F = new MCDataFragment(&RelaSD); WriteRelocationsFragment(Asm, F, &SD); - - Asm.AddSectionToTheEnd(*Writer, RelaSD, Layout); } } -void ELFObjectWriterImpl::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) { +void ELFObjectWriter::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) { Write32(Name); // sh_name: index into string table Write32(Type); // sh_type WriteWord(Flags); // sh_flags @@ -1037,9 +1062,9 @@ void ELFObjectWriterImpl::WriteSecHdrEntry(uint32_t Name, uint32_t Type, WriteWord(EntrySize); // sh_entsize } -void ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm, - MCDataFragment *F, - const MCSectionData *SD) { +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()); @@ -1047,71 +1072,71 @@ void ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm, for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { ELFRelocationEntry entry = Relocs[e - i - 1]; - if (entry.Index < 0) + if (!entry.Index) + ; + else if (entry.Index < 0) entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol); else - entry.Index += LocalSymbolData.size() + 1; + entry.Index += LocalSymbolData.size(); if (Is64Bit) { - char buf[8]; - - String64(buf, entry.r_offset); - F->getContents() += StringRef(buf, 8); + String64(*F, entry.r_offset); struct ELF::Elf64_Rela ERE64; ERE64.setSymbolAndType(entry.Index, entry.Type); - String64(buf, ERE64.r_info); - F->getContents() += StringRef(buf, 8); + String64(*F, ERE64.r_info); - if (HasRelocationAddend) { - String64(buf, entry.r_addend); - F->getContents() += StringRef(buf, 8); - } + if (HasRelocationAddend) + String64(*F, entry.r_addend); } else { - char buf[4]; - - String32(buf, entry.r_offset); - F->getContents() += StringRef(buf, 4); + String32(*F, entry.r_offset); struct ELF::Elf32_Rela ERE32; ERE32.setSymbolAndType(entry.Index, entry.Type); - String32(buf, ERE32.r_info); - F->getContents() += StringRef(buf, 4); + String32(*F, ERE32.r_info); - if (HasRelocationAddend) { - String32(buf, entry.r_addend); - F->getContents() += StringRef(buf, 4); - } + if (HasRelocationAddend) + String32(*F, entry.r_addend); } } } -void ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, - MCAsmLayout &Layout) { +void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, + MCAsmLayout &Layout, + const SectionIndexMapTy &SectionIndexMap) { MCContext &Ctx = Asm.getContext(); MCDataFragment *F; - const MCSection *SymtabSection; unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; - unsigned NumRegularSections = Asm.size(); - // We construct .shstrtab, .symtab and .strtab in this order to match gnu as. - const MCSection *ShstrtabSection; - ShstrtabSection = Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, - SectionKind::getReadOnly(), false); + const MCSectionELF *ShstrtabSection = + Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, + SectionKind::getReadOnly()); MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); ShstrtabSD.setAlignment(1); ShstrtabIndex = Asm.size(); - SymtabSection = Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, - SectionKind::getReadOnly(), - false, EntrySize); + const MCSectionELF *SymtabSection = + Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, + SectionKind::getReadOnly(), + 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; StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, - SectionKind::getReadOnly(), false); + SectionKind::getReadOnly()); MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); StrtabSD.setAlignment(1); StringTableIndex = Asm.size(); @@ -1120,12 +1145,14 @@ void ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, // Symbol table F = new MCDataFragment(&SymtabSD); - WriteSymbolTable(F, Asm, Layout, NumRegularSections); - Asm.AddSectionToTheEnd(*Writer, SymtabSD, Layout); + MCDataFragment *ShndxF = NULL; + if (NeedsSymtabShndx) { + ShndxF = new MCDataFragment(SymtabShndxSD); + } + WriteSymbolTable(F, ShndxF, Asm, Layout, SectionIndexMap); F = new MCDataFragment(&StrtabSD); F->getContents().append(StringTable.begin(), StringTable.end()); - Asm.AddSectionToTheEnd(*Writer, StrtabSD, Layout); F = new MCDataFragment(&ShstrtabSD); @@ -1136,28 +1163,33 @@ void ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, uint64_t Index = 1; F->getContents() += '\x00'; + StringMap SecStringMap; for (MCAssembler::const_iterator 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[&it->getSection()] = Index; + SectionStringTableIndex[&Section] = Index; + SecStringMap[Name] = Index; - Index += Section.getSectionName().size() + 1; - F->getContents() += Section.getSectionName(); + Index += Name.size() + 1; + F->getContents() += Name; F->getContents() += '\x00'; } - - Asm.AddSectionToTheEnd(*Writer, ShstrtabSD, Layout); } -bool ELFObjectWriterImpl::IsFixupFullyResolved(const MCAssembler &Asm, - const MCValue Target, - bool IsPCRel, - const MCFragment *DF) const { +bool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm, + const MCValue Target, + bool IsPCRel, + const MCFragment *DF) const { // If this is a PCrel relocation, find the section this fixup value is // relative to. const MCSection *BaseSection = 0; @@ -1170,31 +1202,207 @@ bool ELFObjectWriterImpl::IsFixupFullyResolved(const MCAssembler &Asm, const MCSymbol *SymbolA = 0; if (const MCSymbolRefExpr *A = Target.getSymA()) { SymbolA = &A->getSymbol(); - SectionA = &SymbolA->getSection(); + SectionA = &SymbolA->AliasedSymbol().getSection(); } const MCSection *SectionB = 0; + const MCSymbol *SymbolB = 0; if (const MCSymbolRefExpr *B = Target.getSymB()) { - SectionB = &B->getSymbol().getSection(); + SymbolB = &B->getSymbol(); + SectionB = &SymbolB->AliasedSymbol().getSection(); } if (!BaseSection) return SectionA == SectionB; + if (SymbolB) + return false; + + // Absolute address but PCrel instruction, so we need a relocation. + if (!SymbolA) + return false; + + // FIXME: This is in here just to match gnu as output. If the two ends + // are in the same section, there is nothing that the linker can do to + // break it. const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA); if (DataA.isExternal()) return false; - return !SectionB && BaseSection == SectionA; + return BaseSection == SectionA; +} + +void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm, + MCAsmLayout &Layout, + GroupMapTy &GroupMap, + RevGroupMapTy &RevGroupMap) { + // Build the groups + for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); + it != ie; ++it) { + const MCSectionELF &Section = + static_cast(it->getSection()); + if (!(Section.getFlags() & MCSectionELF::SHF_GROUP)) + continue; + + const MCSymbol *SignatureSymbol = Section.getGroup(); + Asm.getOrCreateSymbolData(*SignatureSymbol); + const MCSectionELF *&Group = RevGroupMap[SignatureSymbol]; + if (!Group) { + Group = Asm.getContext().CreateELFGroupSection(); + MCSectionData &Data = Asm.getOrCreateSectionData(*Group); + Data.setAlignment(4); + MCDataFragment *F = new MCDataFragment(&Data); + String32(*F, ELF::GRP_COMDAT); + } + GroupMap[Group] = SignatureSymbol; + } + + // 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) { + const MCSectionELF &Section = + static_cast(it->getSection()); + if (!(Section.getFlags() & MCSectionELF::SHF_GROUP)) + continue; + const MCSectionELF *Group = RevGroupMap[Section.getGroup()]; + MCSectionData &Data = Asm.getOrCreateSectionData(*Group); + // FIXME: we could use the previous fragment + MCDataFragment *F = new MCDataFragment(&Data); + String32(*F, NumGroups + Index); + } +} + +void ELFObjectWriter::WriteSection(MCAssembler &Asm, + const SectionIndexMapTy &SectionIndexMap, + uint32_t GroupSymbolIndex, + uint64_t Offset, uint64_t Size, + uint64_t Alignment, + const MCSectionELF &Section) { + uint64_t sh_link = 0; + uint64_t sh_info = 0; + + switch(Section.getType()) { + case ELF::SHT_DYNAMIC: + sh_link = SectionStringTableIndex[&Section]; + sh_info = 0; + break; + + case ELF::SHT_REL: + case ELF::SHT_RELA: { + const MCSectionELF *SymtabSection; + const MCSectionELF *InfoSection; + SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, + 0, + SectionKind::getReadOnly()); + sh_link = SectionIndexMap.lookup(SymtabSection); + assert(sh_link && ".symtab not found"); + + // Remove ".rel" and ".rela" prefixes. + unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; + StringRef SectionName = Section.getSectionName().substr(SecNameLen); + + InfoSection = Asm.getContext().getELFSection(SectionName, + ELF::SHT_PROGBITS, 0, + SectionKind::getReadOnly()); + sh_info = SectionIndexMap.lookup(InfoSection); + break; + } + + case ELF::SHT_SYMTAB: + case ELF::SHT_DYNSYM: + sh_link = StringTableIndex; + sh_info = LastLocalSymbolIndex; + break; + + case ELF::SHT_SYMTAB_SHNDX: + sh_link = SymbolTableIndex; + break; + + case ELF::SHT_PROGBITS: + case ELF::SHT_STRTAB: + case ELF::SHT_NOBITS: + case ELF::SHT_NULL: + case ELF::SHT_ARM_ATTRIBUTES: + // Nothing to do. + break; + + case ELF::SHT_GROUP: { + sh_link = SymbolTableIndex; + sh_info = GroupSymbolIndex; + break; + } + + default: + assert(0 && "FIXME: sh_type value not supported!"); + break; + } + + WriteSecHdrEntry(SectionStringTableIndex[&Section], Section.getType(), + Section.getFlags(), 0, Offset, Size, sh_link, sh_info, + Alignment, Section.getEntrySize()); +} + +static bool IsELFMetaDataSection(const MCSectionData &SD) { + return SD.getOrdinal() == ~UINT32_C(0) && + !SD.getSection().isVirtualSection(); } -void ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, - const MCAsmLayout &Layout) { +static uint64_t DataSectionSize(const MCSectionData &SD) { + uint64_t Ret = 0; + for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e; + ++i) { + const MCFragment &F = *i; + assert(F.getKind() == MCFragment::FT_Data); + Ret += cast(F).getContents().size(); + } + return Ret; +} + +static uint64_t GetSectionFileSize(const MCAsmLayout &Layout, + const MCSectionData &SD) { + if (IsELFMetaDataSection(SD)) + return DataSectionSize(SD); + return Layout.getSectionFileSize(&SD); +} + +static uint64_t GetSectionAddressSize(const MCAsmLayout &Layout, + const MCSectionData &SD) { + if (IsELFMetaDataSection(SD)) + return DataSectionSize(SD); + return Layout.getSectionAddressSize(&SD); +} + +static void 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::WriteObject(MCAssembler &Asm, + const MCAsmLayout &Layout) { + GroupMapTy GroupMap; + RevGroupMapTy RevGroupMap; + CreateGroupSections(Asm, const_cast(Layout), GroupMap, + RevGroupMap); + + SectionIndexMapTy SectionIndexMap; + + ComputeIndexMap(Asm, SectionIndexMap); + // Compute symbol table information. - ComputeSymbolTable(Asm); + ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap); CreateMetadataSections(const_cast(Asm), - const_cast(Layout)); + const_cast(Layout), + SectionIndexMap); + + // Update to include the metadata sections. + ComputeIndexMap(Asm, SectionIndexMap); // Add 1 for the null section. unsigned NumSections = Asm.size() + 1; @@ -1202,16 +1410,23 @@ void ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); uint64_t FileOff = HeaderSize; - for (MCAssembler::const_iterator it = Asm.begin(), - ie = Asm.end(); it != ie; ++it) { - const MCSectionData &SD = *it; + 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) { + const MCSectionELF &Section = *Sections[i]; + const MCSectionData &SD = Asm.getOrCreateSectionData(Section); FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); // Get the size of the section in the output file (including padding). - uint64_t Size = Layout.getSectionFileSize(&SD); - - FileOff += Size; + FileOff += GetSectionFileSize(Layout, SD); } FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); @@ -1224,24 +1439,23 @@ void ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, // ... then all of the sections ... DenseMap SectionOffsetMap; - DenseMap SectionIndexMap; - - unsigned Index = 1; - for (MCAssembler::const_iterator it = Asm.begin(), - ie = Asm.end(); it != ie; ++it) { - const MCSectionData &SD = *it; + for (unsigned i = 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; // Remember the offset into the file for this section. - SectionOffsetMap[&it->getSection()] = FileOff; - SectionIndexMap[&it->getSection()] = Index++; + SectionOffsetMap[&Section] = FileOff; - FileOff += Layout.getSectionFileSize(&SD); + FileOff += GetSectionFileSize(Layout, SD); - Asm.WriteSectionData(it, Layout, Writer); + if (IsELFMetaDataSection(SD)) + WriteDataSectionData(this, SD); + else + Asm.WriteSectionData(&SD, Layout, this); } uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); @@ -1252,112 +1466,315 @@ void ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, // Should we align the section header table? // // Null section first. - WriteSecHdrEntry(0, 0, 0, 0, 0, 0, 0, 0, 0, 0); + 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 = 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]); - for (MCAssembler::const_iterator it = Asm.begin(), - ie = Asm.end(); it != ie; ++it) { - const MCSectionData &SD = *it; - const MCSectionELF &Section = - static_cast(SD.getSection()); + uint64_t Size = GetSectionAddressSize(Layout, SD); - uint64_t sh_link = 0; - uint64_t sh_info = 0; + WriteSection(Asm, SectionIndexMap, GroupSymbolIndex, + SectionOffsetMap[&Section], Size, + SD.getAlignment(), Section); + } +} - switch(Section.getType()) { - case ELF::SHT_DYNAMIC: - sh_link = SectionStringTableIndex[&it->getSection()]; - sh_info = 0; - break; +MCObjectWriter *llvm::createELFObjectWriter(raw_ostream &OS, + bool Is64Bit, + Triple::OSType OSType, + uint16_t EMachine, + bool IsLittleEndian, + bool HasRelocationAddend) { + switch (EMachine) { + case ELF::EM_386: + case ELF::EM_X86_64: + return new X86ELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine, + HasRelocationAddend, OSType); break; + case ELF::EM_ARM: + return new ARMELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine, + HasRelocationAddend, OSType); break; + case ELF::EM_MBLAZE: + return new MBlazeELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine, + HasRelocationAddend, OSType); break; + default: llvm_unreachable("Unsupported architecture"); break; + } +} - case ELF::SHT_REL: - case ELF::SHT_RELA: { - const MCSection *SymtabSection; - const MCSection *InfoSection; - - SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 0, - SectionKind::getReadOnly(), - false); - sh_link = SectionIndexMap[SymtabSection]; - - // Remove ".rel" and ".rela" prefixes. - unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; - StringRef SectionName = Section.getSectionName().substr(SecNameLen); - - InfoSection = Asm.getContext().getELFSection(SectionName, - ELF::SHT_PROGBITS, 0, - SectionKind::getReadOnly(), - false); - sh_info = SectionIndexMap[InfoSection]; - break; - } - case ELF::SHT_SYMTAB: - case ELF::SHT_DYNSYM: - sh_link = StringTableIndex; - sh_info = LastLocalSymbolIndex; - break; +/// START OF SUBCLASSES for ELFObjectWriter +//===- ARMELFObjectWriter -------------------------------------------===// - case ELF::SHT_PROGBITS: - case ELF::SHT_STRTAB: - case ELF::SHT_NOBITS: - case ELF::SHT_NULL: - case ELF::SHT_ARM_ATTRIBUTES: - // Nothing to do. - break; +ARMELFObjectWriter::ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, + bool _IsLittleEndian, + uint16_t _EMachine, bool _HasRelocationAddend, + Triple::OSType _OSType) + : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine, + _HasRelocationAddend, _OSType) +{} - default: - assert(0 && "FIXME: sh_type value not supported!"); - break; - } +ARMELFObjectWriter::~ARMELFObjectWriter() +{} + +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(); - WriteSecHdrEntry(SectionStringTableIndex[&it->getSection()], - Section.getType(), Section.getFlags(), - 0, - SectionOffsetMap.lookup(&SD.getSection()), - Layout.getSectionSize(&SD), sh_link, - sh_info, SD.getAlignment(), - Section.getEntrySize()); + unsigned Type = 0; + if (IsPCRel) { + switch (Modifier) { + default: assert(0 && "Unimplemented Modifier"); + case MCSymbolRefExpr::VK_None: break; + } + switch ((unsigned)Fixup.getKind()) { + default: assert(0 && "Unimplemented"); + case ARM::fixup_arm_branch: Type = ELF::R_ARM_CALL; break; + } + } else { + switch ((unsigned)Fixup.getKind()) { + default: llvm_unreachable("invalid fixup kind!"); + case FK_Data_4: + switch (Modifier) { + default: llvm_unreachable("Unsupported Modifier"); + case MCSymbolRefExpr::VK_ARM_GOTTPOFF: + Type = ELF::R_ARM_TLS_IE32; + } 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_branch: + Type = ELF::R_ARM_CALL; 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; + } } -} -ELFObjectWriter::ELFObjectWriter(raw_ostream &OS, - bool Is64Bit, - Triple::OSType OSType, - uint16_t EMachine, - bool IsLittleEndian, - bool HasRelocationAddend) - : MCObjectWriter(OS, IsLittleEndian) -{ - Impl = new ELFObjectWriterImpl(this, Is64Bit, EMachine, - HasRelocationAddend, OSType); + if (RelocNeedsGOT(Modifier)) + NeedsGOT = true; + + return Type; } -ELFObjectWriter::~ELFObjectWriter() { - delete (ELFObjectWriterImpl*) Impl; -} +//===- MBlazeELFObjectWriter -------------------------------------------===// -void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) { - ((ELFObjectWriterImpl*) Impl)->ExecutePostLayoutBinding(Asm); +MBlazeELFObjectWriter::MBlazeELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, + bool _IsLittleEndian, + uint16_t _EMachine, + bool _HasRelocationAddend, + Triple::OSType _OSType) + : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine, + _HasRelocationAddend, _OSType) { } -void ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, - const MCAsmLayout &Layout, - const MCFragment *Fragment, - const MCFixup &Fixup, MCValue Target, - uint64_t &FixedValue) { - ((ELFObjectWriterImpl*) Impl)->RecordRelocation(Asm, Layout, Fragment, Fixup, - Target, FixedValue); +MBlazeELFObjectWriter::~MBlazeELFObjectWriter() { } -bool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm, - const MCValue Target, - bool IsPCRel, - const MCFragment *DF) const { - return ((ELFObjectWriterImpl*) Impl)->IsFixupFullyResolved(Asm, Target, - IsPCRel, DF); +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; } -void ELFObjectWriter::WriteObject(MCAssembler &Asm, - const MCAsmLayout &Layout) { - ((ELFObjectWriterImpl*) Impl)->WriteObject(Asm, Layout); +//===- X86ELFObjectWriter -------------------------------------------===// + + +X86ELFObjectWriter::X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, + bool _IsLittleEndian, + uint16_t _EMachine, bool _HasRelocationAddend, + Triple::OSType _OSType) + : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine, + _HasRelocationAddend, _OSType) +{} + +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 (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; + } + } 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: + case FK_PCRel_4: + 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; }