X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=lib%2FMC%2FELFObjectWriter.cpp;h=e4442e10a055118eb3ed7a7728a031c67fb2adde;hp=8918097d3d3b1c27c15b564f4f1bdc2bc514fe39;hb=d8ee23f34c2f4b8472f406067140cb4d37c19cab;hpb=edae8e1e4d5bd9b59f18ecef04a248be95d8ca46 diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp index 8918097d3d3..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 // @@ -11,33 +11,384 @@ // //===----------------------------------------------------------------------===// -#include "ELFObjectWriter.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/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/MCFixupKindInfo.h" +#include "llvm/MC/MCObjectWriter.h" #include "llvm/MC/MCSectionELF.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/Support/CommandLine.h" -#include "llvm/ADT/Statistic.h" -#include "llvm/ADT/StringSwitch.h" - -#include "../Target/Mips/MCTargetDesc/MipsFixupKinds.h" -#include "../Target/ARM/MCTargetDesc/ARMFixupKinds.h" -#include "../Target/PowerPC/MCTargetDesc/PPCFixupKinds.h" - +#include "llvm/Support/ErrorHandling.h" #include using namespace llvm; #undef DEBUG_TYPE #define DEBUG_TYPE "reloc-info" +namespace { +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 MCAsmLayout &Layout, const MCSymbolData &Data, + bool Used, bool Renamed); + 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); + + void WriteDataSectionData(MCAssembler &Asm, + const MCAsmLayout &Layout, + const MCSectionELF &Section); + + /*static bool isFixupKindX86RIPRel(unsigned Kind) { + return Kind == X86::reloc_riprel_4byte || + Kind == X86::reloc_riprel_4byte_movq_load; + }*/ + + /// ELFSymbolData - Helper struct for containing some precomputed + /// information on symbols. + struct ELFSymbolData { + MCSymbolData *SymbolData; + uint64_t StringIndex; + uint32_t SectionIndex; + StringRef Name; + + // Support lexicographic sorting. + bool operator<(const ELFSymbolData &RHS) const { + unsigned LHSType = MCELF::GetType(*SymbolData); + unsigned RHSType = MCELF::GetType(*RHS.SymbolData); + if (LHSType == ELF::STT_SECTION && RHSType != ELF::STT_SECTION) + return false; + 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. + std::unique_ptr TargetObjectWriter; + + SmallPtrSet UsedInReloc; + SmallPtrSet WeakrefUsedInReloc; + DenseMap Renames; + + llvm::DenseMap> + Relocations; + StringTableBuilder ShStrTabBuilder; + + /// @} + /// @name Symbol Table Data + /// @{ + + StringTableBuilder StrTabBuilder; + std::vector FileSymbolData; + std::vector LocalSymbolData; + std::vector ExternalSymbolData; + std::vector UndefinedSymbolData; + + /// @} + + bool NeedsGOT; + + // This holds the symbol table index of the last local symbol. + unsigned LastLocalSymbolIndex; + // This holds the .strtab section index. + unsigned StringTableIndex; + // This holds the .symtab section index. + unsigned SymbolTableIndex; + + unsigned ShstrtabIndex; + + + // 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), FWriter(IsLittleEndian), + TargetObjectWriter(MOTW), NeedsGOT(false) {} + + virtual ~ELFObjectWriter(); + + void WriteWord(uint64_t W) { + if (is64Bit()) + Write64(W); + else + Write32(W); + } + + template void write(MCDataFragment &F, T Value) { + FWriter.write(F, Value); + } + + void WriteHeader(const MCAssembler &Asm, + uint64_t SectionDataSize, + unsigned NumberOfSections); + + void WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD, + const MCAsmLayout &Layout); + + void WriteSymbolTable(MCDataFragment *SymtabF, MCAssembler &Asm, + const MCAsmLayout &Layout, + SectionIndexMapTy &SectionIndexMap); + + bool shouldRelocateWithSymbol(const MCAssembler &Asm, + const MCSymbolRefExpr *RefA, + const MCSymbolData *SD, uint64_t C, + unsigned Type) const; + + void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, + const MCFragment *Fragment, const MCFixup &Fixup, + MCValue Target, bool &IsPCRel, + uint64_t &FixedValue) override; + + 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; + + /// Compute the symbol table data + /// + /// \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, + const RevGroupMapTy &RevGroupMap, + unsigned NumRegularSections); + + void ComputeIndexMap(MCAssembler &Asm, + SectionIndexMapTy &SectionIndexMap, + const RelMapTy &RelMap); + + void CreateRelocationSections(MCAssembler &Asm, MCAsmLayout &Layout, + RelMapTy &RelMap); + + void CompressDebugSections(MCAssembler &Asm, MCAsmLayout &Layout); + + 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. + 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); + + void ComputeSectionOrder(MCAssembler &Asm, + std::vector &Sections); + + 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, + const MCSectionData *SD); + + bool + IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm, + const MCSymbolData &DataA, + const MCFragment &FB, + bool InSet, + bool IsPCRel) const override; + + 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); + }; +} + +FragmentWriter::FragmentWriter(bool IsLittleEndian) + : IsLittleEndian(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)); +} + +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)); +} + +template +void SymbolTableWriter::write(MCDataFragment &F, T Value) { + FWriter.write(F, Value); +} + +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) {} + +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; + + if (LargeIndex) + createSymtabShndx(); + + if (ShndxF) { + if (LargeIndex) + write(*ShndxF, shndx); + else + write(*ShndxF, uint32_t(0)); + } + + uint16_t Index = LargeIndex ? uint16_t(ELF::SHN_XINDEX) : shndx; + + raw_svector_ostream OS(SymtabF->getContents()); + + 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) { const MCFixupKindInfo &FKI = Asm.getBackend().getFixupKindInfo((MCFixupKind) Kind); @@ -70,7 +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 // ---------- @@ -108,7 +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)); @@ -132,67 +484,19 @@ void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, 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 (Layout.getAssembler().isThumbFunc(&Data.getSymbol())) + Res |= 1; - if (Data.getFragment()) { - if (Data.getFlags() & ELF_Other_ThumbFunc) - return Layout.getSymbolOffset(&Data)+1; - else - return Layout.getSymbolOffset(&Data); - } - - return 0; + return Res; } void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm, @@ -200,15 +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('@'); @@ -217,8 +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("@@@")) @@ -233,30 +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)) @@ -265,46 +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 || - Section.getType() == ELF::SHT_SYMTAB_SHNDX) - 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) { @@ -313,7 +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++; } @@ -321,162 +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 MCFixup &Fixup, - bool IsPCRel) 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, Fixup, IsPCRel); + // 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 ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel); - 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, Fixup, IsPCRel); + // 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, Fixup, IsPCRel); - - 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); - - // Offset 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); - MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ? - MCSymbolRefExpr::VK_None : Target.getSymA()->getKind(); + FixedValue = C; + + // FIXME: What is this!?!? + MCSymbolRefExpr::VariantKind Modifier = + RefA ? RefA->getKind() : MCSymbolRefExpr::VK_None; if (RelocNeedsGOT(Modifier)) NeedsGOT = true; - uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) + - Fixup.getOffset(); - - adjustFixupOffset(Fixup, RelocOffset); - - if (!hasRelocationAddend()) - Addend = 0; + 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; + } - if (is64Bit()) - assert(isInt<64>(Addend)); - else - assert(isInt<32>(Addend)); + if (SymA) { + if (const MCSymbol *R = Renames.lookup(SymA)) + SymA = R; - 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; @@ -484,42 +913,35 @@ 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; } @@ -552,73 +974,64 @@ void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, } } -void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, - const SectionIndexMapTy &SectionIndexMap, - RevGroupMapTy RevGroupMap, - unsigned NumRegularSections) { +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); } - // Index 0 is always the empty string. - StringMap StringIndexMap; - StringTable += '\x00'; - - // FIXME: We could optimize suffixes in strtab in the same way we - // optimize them in shstrtab. - // 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!"); } @@ -626,7 +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); @@ -635,13 +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) @@ -650,6 +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()); @@ -657,19 +1083,14 @@ 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++); - - if (NumRegularSections > ELF::SHN_LORESERVE) - NeedsSymtabShndx = true; } void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm, @@ -695,16 +1116,168 @@ void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm, else EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); + 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, 0, + ELF::SHT_RELA : ELF::SHT_REL, Flags, SectionKind::getReadOnly(), - EntrySize, ""); + 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(), @@ -742,62 +1315,65 @@ 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)); } } } -static int compareBySuffix(const void *a, const void *b) { - const MCSectionELF *secA = *static_cast(a); - const MCSectionELF *secB = *static_cast(b); - const StringRef &NameA = secA->getSectionName(); - const StringRef &NameB = secB->getSectionName(); - const unsigned sizeA = NameA.size(); - const unsigned sizeB = NameB.size(); - const unsigned len = std::min(sizeA, sizeB); - for (unsigned int i = 0; i < len; ++i) { - char ca = NameA[sizeA - i - 1]; - char cb = NameB[sizeB - i - 1]; - if (ca != cb) - return cb - ca; - } - - return sizeB - sizeA; -} - void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout, SectionIndexMapTy &SectionIndexMap, @@ -821,16 +1397,6 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); SymtabSD.setAlignment(is64Bit() ? 8 : 4); - 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 MCSectionELF *StrtabSection; StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, SectionKind::getReadOnly()); @@ -845,52 +1411,23 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, // 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); - std::vector Sections; - for (MCAssembler::const_iterator it = Asm.begin(), - ie = Asm.end(); it != ie; ++it) { + // Section header string table. + for (auto it = Asm.begin(), ie = Asm.end(); it != ie; ++it) { const MCSectionELF &Section = static_cast(it->getSection()); - Sections.push_back(&Section); - } - array_pod_sort(Sections.begin(), Sections.end(), compareBySuffix); - - // 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'; - - for (unsigned int I = 0, E = Sections.size(); I != E; ++I) { - const MCSectionELF &Section = *Sections[I]; - - StringRef Name = Section.getSectionName(); - if (I != 0) { - StringRef PreviousName = Sections[I - 1]->getSectionName(); - if (PreviousName.endswith(Name)) { - SectionStringTableIndex[&Section] = Index - Name.size() - 1; - 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; - - 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, @@ -899,14 +1436,7 @@ void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm, RevGroupMapTy &RevGroupMap, SectionIndexMapTy &SectionIndexMap, const RelMapTy &RelMap) { - // Create the .note.GNU-stack section if needed. 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(); @@ -924,7 +1454,7 @@ 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; } @@ -942,8 +1472,8 @@ void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm, MCSectionData &Data = Asm.getOrCreateSectionData(*Group); // FIXME: we could use the previous fragment MCDataFragment *F = new MCDataFragment(&Data); - unsigned Index = SectionIndexMap.lookup(&Section); - String32(*F, Index); + uint32_t Index = SectionIndexMap.lookup(&Section); + write(*F, Index); } } @@ -958,7 +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; @@ -975,10 +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; } @@ -1003,6 +1535,9 @@ 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; @@ -1012,11 +1547,30 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm, 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()); } @@ -1054,21 +1608,17 @@ uint64_t ELFObjectWriter::GetSectionAddressSize(const MCAsmLayout &Layout, void ELFObjectWriter::WriteDataSectionData(MCAssembler &Asm, const MCAsmLayout &Layout, const MCSectionELF &Section) { - uint64_t FileOff = OS.tell(); const MCSectionData &SD = Asm.getOrCreateSectionData(Section); - uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment()); + uint64_t Padding = OffsetToAlignment(OS.tell(), SD.getAlignment()); WriteZeros(Padding); - FileOff += Padding; - - FileOff += GetSectionFileSize(Layout, SD); 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().str()); + WriteBytes(cast(F).getContents()); } } else { Asm.writeSectionData(&SD, Layout); @@ -1154,6 +1704,8 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm, unsigned NumUserSections = Asm.size(); + CompressDebugSections(Asm, const_cast(Layout)); + DenseMap RelMap; CreateRelocationSections(Asm, const_cast(Layout), RelMap); @@ -1166,8 +1718,8 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm, unsigned NumRegularSections = NumUserSections + NumIndexedSections; // Compute symbol table information. - ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap, NumRegularSections); - + computeSymbolTable(Asm, Layout, SectionIndexMap, RevGroupMap, + NumRegularSections); WriteRelocations(Asm, const_cast(Layout), RelMap); @@ -1220,23 +1772,20 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm, } // Write out the ELF header ... - WriteHeader(SectionHeaderOffset, NumSections + 1); + WriteHeader(Asm, SectionHeaderOffset, NumSections + 1); // ... then the regular sections ... // + because of .shstrtab for (unsigned i = 0; i < NumRegularSections + 1; ++i) WriteDataSectionData(Asm, Layout, *Sections[i]); - FileOff = OS.tell(); - uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); + uint64_t Padding = OffsetToAlignment(OS.tell(), NaturalAlignment); WriteZeros(Padding); // ... then the section header table ... WriteSectionHeader(Asm, GroupMap, Layout, SectionIndexMap, SectionOffsetMap); - FileOff = OS.tell(); - // ... and then the remaining sections ... for (unsigned i = NumRegularSections + 1; i < NumSections; ++i) WriteDataSectionData(Asm, Layout, *Sections[i]); @@ -1248,7 +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); @@ -1257,469 +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 ELFObjectWriter(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; - case ELF::EM_PPC: - case ELF::EM_PPC64: - return new PPCELFObjectWriter(MOTW, OS, IsLittleEndian); break; - case ELF::EM_MIPS: - return new MipsELFObjectWriter(MOTW, OS, IsLittleEndian); break; - default: llvm_unreachable("Unsupported architecture"); break; - } -} - -unsigned ELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) const { - return TargetObjectWriter->GetRelocType(Target, Fixup, IsPCRel, - IsRelocWithSymbol, Addend); -} - -/// 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 an approximation of what ARM/gcc does. - -STATISTIC(PCRelCount, "Total number of PIC Relocations"); -STATISTIC(NonPCRelCount, "Total number of non-PIC relocations"); - -const MCSymbol *ARMELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm, - const MCValue &Target, - const MCFragment &F, - const MCFixup &Fixup, - bool IsPCRel) const { - const MCSymbol &Symbol = Target.getSymA()->getSymbol(); - bool EmitThisSym = false; - - const MCSectionELF &Section = - static_cast(Symbol.getSection()); - bool InNormalSection = true; - unsigned RelocType = 0; - RelocType = GetRelocTypeInner(Target, Fixup, IsPCRel); - - DEBUG( - const MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); - MCSymbolRefExpr::VariantKind Kind2; - Kind2 = Target.getSymB() ? Target.getSymB()->getKind() : - MCSymbolRefExpr::VK_None; - dbgs() << "considering symbol " - << Section.getSectionName() << "/" - << Symbol.getName() << "/" - << " Rel:" << (unsigned)RelocType - << " Kind: " << (int)Kind << "/" << (int)Kind2 - << " Tmp:" - << Symbol.isAbsolute() << "/" << Symbol.isDefined() << "/" - << Symbol.isVariable() << "/" << Symbol.isTemporary() - << " Counts:" << PCRelCount << "/" << NonPCRelCount << "\n"); - - if (IsPCRel) { ++PCRelCount; - switch (RelocType) { - default: - // Most relocation types are emitted as explicit symbols - InNormalSection = - StringSwitch(Section.getSectionName()) - .Case(".data.rel.ro.local", false) - .Case(".data.rel", false) - .Case(".bss", false) - .Default(true); - EmitThisSym = true; - break; - case ELF::R_ARM_ABS32: - // But things get strange with R_ARM_ABS32 - // In this case, most things that go in .rodata show up - // as section relative relocations - InNormalSection = - StringSwitch(Section.getSectionName()) - .Case(".data.rel.ro.local", false) - .Case(".data.rel", false) - .Case(".rodata", false) - .Case(".bss", false) - .Default(true); - EmitThisSym = false; - break; - } - } else { - NonPCRelCount++; - InNormalSection = - StringSwitch(Section.getSectionName()) - .Case(".data.rel.ro.local", false) - .Case(".rodata", false) - .Case(".data.rel", false) - .Case(".bss", false) - .Default(true); - - switch (RelocType) { - default: EmitThisSym = true; break; - case ELF::R_ARM_ABS32: EmitThisSym = false; break; - } - } - - if (EmitThisSym) - return &Symbol; - if (! Symbol.isTemporary() && InNormalSection) { - return &Symbol; - } - return NULL; -} - -// Need to examine the Fixup when determining whether to -// emit the relocation as an explicit symbol or as a section relative -// offset -unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) const { - return GetRelocTypeInner(Target, Fixup, IsPCRel); -} - -unsigned ARMELFObjectWriter::GetRelocTypeInner(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel) const { - 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_REL32; - 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; - case ARM::fixup_arm_thumb_bl: - case ARM::fixup_arm_thumb_blx: - switch (Modifier) { - case MCSymbolRefExpr::VK_ARM_PLT: - Type = ELF::R_ARM_THM_CALL; - break; - default: - Type = ELF::R_ARM_NONE; - break; - } - 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; - } - } - - return Type; -} - -//===- PPCELFObjectWriter -------------------------------------------===// - -PPCELFObjectWriter::PPCELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian) - : ELFObjectWriter(MOTW, _OS, IsLittleEndian) { -} - -PPCELFObjectWriter::~PPCELFObjectWriter() { -} - -unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) const { - // determine the type of the relocation - unsigned Type; - if (IsPCRel) { - switch ((unsigned)Fixup.getKind()) { - default: - llvm_unreachable("Unimplemented"); - case PPC::fixup_ppc_br24: - Type = ELF::R_PPC_REL24; - break; - case FK_PCRel_4: - Type = ELF::R_PPC_REL32; - break; - } - } else { - switch ((unsigned)Fixup.getKind()) { - default: llvm_unreachable("invalid fixup kind!"); - case PPC::fixup_ppc_br24: - Type = ELF::R_PPC_ADDR24; - break; - case PPC::fixup_ppc_brcond14: - Type = ELF::R_PPC_ADDR14_BRTAKEN; // XXX: or BRNTAKEN?_ - break; - case PPC::fixup_ppc_ha16: - Type = ELF::R_PPC_ADDR16_HA; - break; - case PPC::fixup_ppc_lo16: - Type = ELF::R_PPC_ADDR16_LO; - break; - case PPC::fixup_ppc_lo14: - Type = ELF::R_PPC_ADDR14; - break; - case FK_Data_4: - Type = ELF::R_PPC_ADDR32; - break; - case FK_Data_2: - Type = ELF::R_PPC_ADDR16; - break; - } - } - return Type; -} - -void PPCELFObjectWriter:: -adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) { - switch ((unsigned)Fixup.getKind()) { - case PPC::fixup_ppc_ha16: - case PPC::fixup_ppc_lo16: - RelocOffset += 2; - break; - default: - break; - } -} - -//===- 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) const { - // 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; -} - -//===- MipsELFObjectWriter -------------------------------------------===// - -MipsELFObjectWriter::MipsELFObjectWriter(MCELFObjectTargetWriter *MOTW, - raw_ostream &_OS, - bool IsLittleEndian) - : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {} - -MipsELFObjectWriter::~MipsELFObjectWriter() {} - -// FIXME: get the real EABI Version from the Triple. -void MipsELFObjectWriter::WriteEFlags() { - Write32(ELF::EF_MIPS_NOREORDER | - ELF::EF_MIPS_ARCH_32R2); -} - -const MCSymbol *MipsELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm, - const MCValue &Target, - const MCFragment &F, - const MCFixup &Fixup, - bool IsPCRel) const { - assert(Target.getSymA() && "SymA cannot be 0."); - const MCSymbol &Sym = Target.getSymA()->getSymbol(); - - if (Sym.getSection().getKind().isMergeableCString() || - Sym.getSection().getKind().isMergeableConst()) - return &Sym; - - return NULL; -} - -unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) const { - // determine the type of the relocation - unsigned Type = (unsigned)ELF::R_MIPS_NONE; - unsigned Kind = (unsigned)Fixup.getKind(); - - switch (Kind) { - default: - llvm_unreachable("invalid fixup kind!"); - case FK_Data_4: - Type = ELF::R_MIPS_32; - break; - case FK_GPRel_4: - Type = ELF::R_MIPS_GPREL32; - break; - case Mips::fixup_Mips_GPREL16: - Type = ELF::R_MIPS_GPREL16; - break; - case Mips::fixup_Mips_26: - Type = ELF::R_MIPS_26; - break; - case Mips::fixup_Mips_CALL16: - Type = ELF::R_MIPS_CALL16; - break; - case Mips::fixup_Mips_GOT_Global: - case Mips::fixup_Mips_GOT_Local: - Type = ELF::R_MIPS_GOT16; - break; - case Mips::fixup_Mips_HI16: - Type = ELF::R_MIPS_HI16; - break; - case Mips::fixup_Mips_LO16: - Type = ELF::R_MIPS_LO16; - break; - case Mips::fixup_Mips_TLSGD: - Type = ELF::R_MIPS_TLS_GD; - break; - case Mips::fixup_Mips_GOTTPREL: - Type = ELF::R_MIPS_TLS_GOTTPREL; - break; - case Mips::fixup_Mips_TPREL_HI: - Type = ELF::R_MIPS_TLS_TPREL_HI16; - break; - case Mips::fixup_Mips_TPREL_LO: - Type = ELF::R_MIPS_TLS_TPREL_LO16; - break; - case Mips::fixup_Mips_Branch_PCRel: - case Mips::fixup_Mips_PC16: - Type = ELF::R_MIPS_PC16; - break; - } - - return Type; + return new ELFObjectWriter(MOTW, OS, IsLittleEndian); }