| //===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements ELF object file writer information. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ELFObjectWriter.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/StringMap.h" |
| #include "llvm/ADT/Twine.h" |
| #include "llvm/MC/MCAsmBackend.h" |
| #include "llvm/MC/MCAsmLayout.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCSectionELF.h" |
| #include "llvm/MC/MCValue.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/ELF.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/ADT/StringSwitch.h" |
| |
| #include "../Target/X86/MCTargetDesc/X86FixupKinds.h" |
| #include "../Target/ARM/MCTargetDesc/ARMFixupKinds.h" |
| #include "../Target/PowerPC/MCTargetDesc/PPCFixupKinds.h" |
| |
| #include <vector> |
| using namespace llvm; |
| |
| #undef DEBUG_TYPE |
| #define DEBUG_TYPE "reloc-info" |
| |
| bool ELFObjectWriter::isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind) { |
| const MCFixupKindInfo &FKI = |
| Asm.getBackend().getFixupKindInfo((MCFixupKind) Kind); |
| |
| return FKI.Flags & MCFixupKindInfo::FKF_IsPCRel; |
| } |
| |
| bool ELFObjectWriter::RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) { |
| switch (Variant) { |
| default: |
| return false; |
| case MCSymbolRefExpr::VK_GOT: |
| case MCSymbolRefExpr::VK_PLT: |
| case MCSymbolRefExpr::VK_GOTPCREL: |
| case MCSymbolRefExpr::VK_GOTOFF: |
| case MCSymbolRefExpr::VK_TPOFF: |
| case MCSymbolRefExpr::VK_TLSGD: |
| case MCSymbolRefExpr::VK_GOTTPOFF: |
| case MCSymbolRefExpr::VK_INDNTPOFF: |
| case MCSymbolRefExpr::VK_NTPOFF: |
| case MCSymbolRefExpr::VK_GOTNTPOFF: |
| case MCSymbolRefExpr::VK_TLSLDM: |
| case MCSymbolRefExpr::VK_DTPOFF: |
| case MCSymbolRefExpr::VK_TLSLD: |
| return true; |
| } |
| } |
| |
| ELFObjectWriter::~ELFObjectWriter() |
| {} |
| |
| // Emit the ELF header. |
| void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, |
| unsigned NumberOfSections) { |
| // ELF Header |
| // ---------- |
| // |
| // Note |
| // ---- |
| // emitWord method behaves differently for ELF32 and ELF64, writing |
| // 4 bytes in the former and 8 in the latter. |
| |
| Write8(0x7f); // e_ident[EI_MAG0] |
| Write8('E'); // e_ident[EI_MAG1] |
| Write8('L'); // e_ident[EI_MAG2] |
| Write8('F'); // e_ident[EI_MAG3] |
| |
| Write8(is64Bit() ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] |
| |
| // e_ident[EI_DATA] |
| Write8(isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); |
| |
| Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] |
| // e_ident[EI_OSABI] |
| switch (TargetObjectWriter->getOSType()) { |
| case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break; |
| case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break; |
| default: Write8(ELF::ELFOSABI_NONE); break; |
| } |
| Write8(0); // e_ident[EI_ABIVERSION] |
| |
| WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); |
| |
| Write16(ELF::ET_REL); // e_type |
| |
| Write16(TargetObjectWriter->getEMachine()); // e_machine = target |
| |
| Write32(ELF::EV_CURRENT); // e_version |
| WriteWord(0); // e_entry, no entry point in .o file |
| WriteWord(0); // e_phoff, no program header for .o |
| WriteWord(SectionDataSize + (is64Bit() ? sizeof(ELF::Elf64_Ehdr) : |
| sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes |
| |
| // e_flags = whatever the target wants |
| WriteEFlags(); |
| |
| // e_ehsize = ELF header size |
| Write16(is64Bit() ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); |
| |
| Write16(0); // e_phentsize = prog header entry size |
| Write16(0); // e_phnum = # prog header entries = 0 |
| |
| // e_shentsize = Section header entry size |
| Write16(is64Bit() ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); |
| |
| // e_shnum = # of section header ents |
| if (NumberOfSections >= ELF::SHN_LORESERVE) |
| Write16(ELF::SHN_UNDEF); |
| else |
| Write16(NumberOfSections); |
| |
| // e_shstrndx = Section # of '.shstrtab' |
| if (ShstrtabIndex >= ELF::SHN_LORESERVE) |
| Write16(ELF::SHN_XINDEX); |
| else |
| Write16(ShstrtabIndex); |
| } |
| |
| void ELFObjectWriter::WriteSymbolEntry(MCDataFragment *SymtabF, |
| MCDataFragment *ShndxF, |
| uint64_t name, |
| uint8_t info, uint64_t value, |
| uint64_t size, uint8_t other, |
| uint32_t shndx, |
| bool Reserved) { |
| if (ShndxF) { |
| if (shndx >= ELF::SHN_LORESERVE && !Reserved) |
| String32(*ShndxF, shndx); |
| else |
| String32(*ShndxF, 0); |
| } |
| |
| uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ? |
| uint16_t(ELF::SHN_XINDEX) : shndx; |
| |
| if (is64Bit()) { |
| String32(*SymtabF, name); // st_name |
| String8(*SymtabF, info); // st_info |
| String8(*SymtabF, other); // st_other |
| String16(*SymtabF, Index); // st_shndx |
| String64(*SymtabF, value); // st_value |
| String64(*SymtabF, size); // st_size |
| } else { |
| String32(*SymtabF, name); // st_name |
| String32(*SymtabF, value); // st_value |
| String32(*SymtabF, size); // st_size |
| String8(*SymtabF, info); // st_info |
| String8(*SymtabF, other); // st_other |
| String16(*SymtabF, Index); // st_shndx |
| } |
| } |
| |
| uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &Data, |
| const MCAsmLayout &Layout) { |
| if (Data.isCommon() && Data.isExternal()) |
| return Data.getCommonAlignment(); |
| |
| const MCSymbol &Symbol = Data.getSymbol(); |
| |
| if (Symbol.isAbsolute() && Symbol.isVariable()) { |
| if (const MCExpr *Value = Symbol.getVariableValue()) { |
| int64_t IntValue; |
| if (Value->EvaluateAsAbsolute(IntValue, Layout)) |
| return (uint64_t)IntValue; |
| } |
| } |
| |
| if (!Symbol.isInSection()) |
| return 0; |
| |
| |
| if (Data.getFragment()) { |
| if (Data.getFlags() & ELF_Other_ThumbFunc) |
| return Layout.getSymbolOffset(&Data)+1; |
| else |
| return Layout.getSymbolOffset(&Data); |
| } |
| |
| return 0; |
| } |
| |
| 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 = Alias.AliasedSymbol(); |
| MCSymbolData &SD = Asm.getSymbolData(Symbol); |
| |
| // Not an alias. |
| if (&Symbol == &Alias) |
| continue; |
| |
| StringRef AliasName = Alias.getName(); |
| size_t Pos = AliasName.find('@'); |
| if (Pos == StringRef::npos) |
| continue; |
| |
| // 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)); |
| |
| StringRef Rest = AliasName.substr(Pos); |
| if (!Symbol.isUndefined() && !Rest.startswith("@@@")) |
| continue; |
| |
| // FIXME: produce a better error message. |
| if (Symbol.isUndefined() && Rest.startswith("@@") && |
| !Rest.startswith("@@@")) |
| report_fatal_error("A @@ version cannot be undefined"); |
| |
| Renames.insert(std::make_pair(&Symbol, &Alias)); |
| } |
| } |
| |
| void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, |
| MCDataFragment *ShndxF, |
| ELFSymbolData &MSD, |
| const MCAsmLayout &Layout) { |
| MCSymbolData &OrigData = *MSD.SymbolData; |
| MCSymbolData &Data = |
| Layout.getAssembler().getSymbolData(OrigData.getSymbol().AliasedSymbol()); |
| |
| bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() || |
| Data.getSymbol().isVariable(); |
| |
| uint8_t Binding = MCELF::GetBinding(OrigData); |
| uint8_t Visibility = MCELF::GetVisibility(OrigData); |
| uint8_t Type = MCELF::GetType(Data); |
| |
| uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); |
| uint8_t Other = Visibility; |
| |
| uint64_t Value = SymbolValue(Data, Layout); |
| uint64_t Size = 0; |
| |
| assert(!(Data.isCommon() && !Data.isExternal())); |
| |
| const MCExpr *ESize = Data.getSize(); |
| if (ESize) { |
| int64_t Res; |
| if (!ESize->EvaluateAsAbsolute(Res, Layout)) |
| report_fatal_error("Size expression must be absolute."); |
| Size = Res; |
| } |
| |
| // Write out the symbol table entry |
| WriteSymbolEntry(SymtabF, ShndxF, MSD.StringIndex, Info, Value, |
| Size, Other, MSD.SectionIndex, IsReserved); |
| } |
| |
| 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"); |
| |
| // FIXME: Make sure the start of the symbol table is aligned. |
| |
| // The first entry is the undefined symbol entry. |
| 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(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<const MCSectionELF&>(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++; |
| } |
| |
| for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { |
| ELFSymbolData &MSD = ExternalSymbolData[i]; |
| MCSymbolData &Data = *MSD.SymbolData; |
| 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); |
| if (MCELF::GetBinding(Data) == ELF::STB_LOCAL) |
| LastLocalSymbolIndex++; |
| } |
| |
| for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { |
| ELFSymbolData &MSD = UndefinedSymbolData[i]; |
| MCSymbolData &Data = *MSD.SymbolData; |
| WriteSymbol(SymtabF, ShndxF, 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; |
| } |
| |
| if (SD.isExternal()) { |
| if (Renamed) |
| return Renamed; |
| return &Symbol; |
| } |
| |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF&>(ASymbol.getSection()); |
| const SectionKind secKind = Section.getKind(); |
| |
| if (secKind.isBSS()) |
| return ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel); |
| |
| if (secKind.isThreadLocal()) { |
| if (Renamed) |
| return Renamed; |
| return &Symbol; |
| } |
| |
| MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); |
| const MCSectionELF &Sec2 = |
| static_cast<const MCSectionELF&>(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 (Section.getFlags() & ELF::SHF_MERGE) { |
| if (Target.getConstant() == 0) |
| return ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel); |
| if (Renamed) |
| return Renamed; |
| return &Symbol; |
| } |
| |
| return ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel); |
| |
| } |
| |
| |
| 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 *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); |
| |
| // Ofeset of the relocation in the section |
| int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); |
| Value += b - a; |
| } |
| |
| if (!RelocSymbol) { |
| MCSymbolData &SD = Asm.getSymbolData(ASymbol); |
| MCFragment *F = SD.getFragment(); |
| |
| Index = F->getParent()->getOrdinal() + 1; |
| |
| // 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; |
| } |
| |
| FixedValue = Value; |
| unsigned Type = GetRelocType(Target, Fixup, IsPCRel, |
| (RelocSymbol != 0), Addend); |
| |
| uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) + |
| Fixup.getOffset(); |
| |
| adjustFixupOffset(Fixup, RelocOffset); |
| |
| if (!hasRelocationAddend()) |
| Addend = 0; |
| |
| if (is64Bit()) |
| assert(isInt<64>(Addend)); |
| else |
| assert(isInt<32>(Addend)); |
| |
| ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend); |
| Relocations[Fragment->getParent()].push_back(ERE); |
| } |
| |
| |
| uint64_t |
| ELFObjectWriter::getSymbolIndexInSymbolTable(const MCAssembler &Asm, |
| const MCSymbol *S) { |
| 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; |
| |
| if (Used) |
| return true; |
| |
| 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; |
| |
| 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) { |
| 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; |
| |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, |
| SectionIndexMapTy &SectionIndexMap, |
| const RelMapTy &RelMap) { |
| unsigned Index = 1; |
| for (MCAssembler::iterator it = Asm.begin(), |
| ie = Asm.end(); it != ie; ++it) { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF &>(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<const MCSectionELF &>(it->getSection()); |
| if (Section.getType() == ELF::SHT_GROUP || |
| Section.getType() == ELF::SHT_REL || |
| Section.getType() == ELF::SHT_RELA) |
| continue; |
| SectionIndexMap[&Section] = Index++; |
| const MCSectionELF *RelSection = RelMap.lookup(&Section); |
| if (RelSection) |
| SectionIndexMap[RelSection] = Index++; |
| } |
| } |
| |
| void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, |
| const SectionIndexMapTy &SectionIndexMap, |
| RevGroupMapTy RevGroupMap, |
| 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_"; |
| 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<uint64_t> 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(); |
| |
| 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; |
| 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 && MCELF::GetBinding(*it) == ELF::STB_LOCAL) { |
| MCSymbolData &SD = Asm.getSymbolData(RefSymbol); |
| MCELF::SetBinding(*it, ELF::STB_GLOBAL); |
| MCELF::SetBinding(SD, ELF::STB_GLOBAL); |
| } |
| |
| if (RefSymbol.isUndefined() && !Used && WeakrefUsed) |
| MCELF::SetBinding(*it, ELF::STB_WEAK); |
| |
| if (it->isCommon()) { |
| assert(!Local); |
| MSD.SectionIndex = ELF::SHN_COMMON; |
| } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { |
| MSD.SectionIndex = ELF::SHN_ABS; |
| } else if (RefSymbol.isUndefined()) { |
| if (isSignature && !Used) |
| MSD.SectionIndex = SectionIndexMap.lookup(RevGroupMap[&Symbol]); |
| else |
| MSD.SectionIndex = ELF::SHN_UNDEF; |
| } else { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF&>(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("@@@"); |
| if (Pos != StringRef::npos) { |
| 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[Name]; |
| if (!Entry) { |
| Entry = StringTable.size(); |
| StringTable += Name; |
| StringTable += '\x00'; |
| } |
| MSD.StringIndex = Entry; |
| if (MSD.SectionIndex == ELF::SHN_UNDEF) |
| UndefinedSymbolData.push_back(MSD); |
| else if (Local) |
| LocalSymbolData.push_back(MSD); |
| else |
| ExternalSymbolData.push_back(MSD); |
| } |
| |
| // Symbols are required to be in lexicographic order. |
| array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); |
| array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); |
| array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end()); |
| |
| // Set the symbol indices. Local symbols must come before all other |
| // symbols with non-local bindings. |
| 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++); |
| |
| if (NumRegularSections > ELF::SHN_LORESERVE) |
| NeedsSymtabShndx = true; |
| } |
| |
| void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm, |
| MCAsmLayout &Layout, |
| RelMapTy &RelMap) { |
| for (MCAssembler::const_iterator it = Asm.begin(), |
| ie = Asm.end(); it != ie; ++it) { |
| const MCSectionData &SD = *it; |
| if (Relocations[&SD].empty()) |
| continue; |
| |
| MCContext &Ctx = Asm.getContext(); |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF&>(SD.getSection()); |
| |
| const StringRef SectionName = Section.getSectionName(); |
| std::string RelaSectionName = hasRelocationAddend() ? ".rela" : ".rel"; |
| RelaSectionName += SectionName; |
| |
| unsigned EntrySize; |
| if (hasRelocationAddend()) |
| EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela); |
| else |
| EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); |
| |
| const MCSectionELF *RelaSection = |
| Ctx.getELFSection(RelaSectionName, hasRelocationAddend() ? |
| ELF::SHT_RELA : ELF::SHT_REL, 0, |
| SectionKind::getReadOnly(), |
| EntrySize, ""); |
| RelMap[&Section] = RelaSection; |
| Asm.getOrCreateSectionData(*RelaSection); |
| } |
| } |
| |
| void ELFObjectWriter::WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout, |
| const RelMapTy &RelMap) { |
| for (MCAssembler::const_iterator it = Asm.begin(), |
| ie = Asm.end(); it != ie; ++it) { |
| const MCSectionData &SD = *it; |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF&>(SD.getSection()); |
| |
| const MCSectionELF *RelaSection = RelMap.lookup(&Section); |
| if (!RelaSection) |
| continue; |
| MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); |
| RelaSD.setAlignment(is64Bit() ? 8 : 4); |
| |
| MCDataFragment *F = new MCDataFragment(&RelaSD); |
| WriteRelocationsFragment(Asm, F, &*it); |
| } |
| } |
| |
| 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 |
| WriteWord(Address); // sh_addr |
| WriteWord(Offset); // sh_offset |
| WriteWord(Size); // sh_size |
| Write32(Link); // sh_link |
| Write32(Info); // sh_info |
| WriteWord(Alignment); // sh_addralign |
| WriteWord(EntrySize); // sh_entsize |
| } |
| |
| void ELFObjectWriter::WriteRelocationsFragment(const MCAssembler &Asm, |
| MCDataFragment *F, |
| const MCSectionData *SD) { |
| std::vector<ELFRelocationEntry> &Relocs = Relocations[SD]; |
| // sort by the r_offset just like gnu as does |
| array_pod_sort(Relocs.begin(), Relocs.end()); |
| |
| for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { |
| ELFRelocationEntry entry = Relocs[e - i - 1]; |
| |
| 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); |
| |
| if (hasRelocationAddend()) |
| String64(*F, entry.r_addend); |
| } else { |
| String32(*F, entry.r_offset); |
| |
| struct ELF::Elf32_Rela ERE32; |
| ERE32.setSymbolAndType(entry.Index, entry.Type); |
| String32(*F, ERE32.r_info); |
| |
| if (hasRelocationAddend()) |
| String32(*F, entry.r_addend); |
| } |
| } |
| } |
| |
| static int compareBySuffix(const void *a, const void *b) { |
| const MCSectionELF *secA = *static_cast<const MCSectionELF* const *>(a); |
| const MCSectionELF *secB = *static_cast<const MCSectionELF* const *>(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, |
| const RelMapTy &RelMap) { |
| MCContext &Ctx = Asm.getContext(); |
| MCDataFragment *F; |
| |
| unsigned EntrySize = is64Bit() ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; |
| |
| // We construct .shstrtab, .symtab and .strtab in this order to match gnu as. |
| const MCSectionELF *ShstrtabSection = |
| Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, |
| SectionKind::getReadOnly()); |
| MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); |
| ShstrtabSD.setAlignment(1); |
| |
| const MCSectionELF *SymtabSection = |
| Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, |
| SectionKind::getReadOnly(), |
| EntrySize, ""); |
| 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()); |
| MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); |
| StrtabSD.setAlignment(1); |
| |
| ComputeIndexMap(Asm, SectionIndexMap, RelMap); |
| |
| ShstrtabIndex = SectionIndexMap.lookup(ShstrtabSection); |
| SymbolTableIndex = SectionIndexMap.lookup(SymtabSection); |
| StringTableIndex = SectionIndexMap.lookup(StrtabSection); |
| |
| // Symbol table |
| F = new MCDataFragment(&SymtabSD); |
| MCDataFragment *ShndxF = NULL; |
| if (NeedsSymtabShndx) { |
| ShndxF = new MCDataFragment(SymtabShndxSD); |
| } |
| WriteSymbolTable(F, ShndxF, Asm, Layout, SectionIndexMap); |
| |
| F = new MCDataFragment(&StrtabSD); |
| F->getContents().append(StringTable.begin(), StringTable.end()); |
| |
| F = new MCDataFragment(&ShstrtabSD); |
| |
| std::vector<const MCSectionELF*> Sections; |
| for (MCAssembler::const_iterator it = Asm.begin(), |
| ie = Asm.end(); it != ie; ++it) { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF&>(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'; |
| } |
| } |
| |
| void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm, |
| MCAsmLayout &Layout, |
| GroupMapTy &GroupMap, |
| 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(); |
| it != ie; ++it) { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF&>(it->getSection()); |
| if (!(Section.getFlags() & ELF::SHF_GROUP)) |
| continue; |
| |
| const MCSymbol *SignatureSymbol = Section.getGroup(); |
| Asm.getOrCreateSymbolData(*SignatureSymbol); |
| const MCSectionELF *&Group = RevGroupMap[SignatureSymbol]; |
| if (!Group) { |
| Group = Ctx.CreateELFGroupSection(); |
| MCSectionData &Data = Asm.getOrCreateSectionData(*Group); |
| Data.setAlignment(4); |
| MCDataFragment *F = new MCDataFragment(&Data); |
| String32(*F, ELF::GRP_COMDAT); |
| } |
| GroupMap[Group] = SignatureSymbol; |
| } |
| |
| ComputeIndexMap(Asm, SectionIndexMap, RelMap); |
| |
| // Add sections to the groups |
| for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); |
| it != ie; ++it) { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF&>(it->getSection()); |
| if (!(Section.getFlags() & ELF::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); |
| unsigned Index = SectionIndexMap.lookup(&Section); |
| String32(*F, 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_NOTE: |
| case ELF::SHT_NULL: |
| case ELF::SHT_ARM_ATTRIBUTES: |
| case ELF::SHT_INIT_ARRAY: |
| case ELF::SHT_FINI_ARRAY: |
| case ELF::SHT_PREINIT_ARRAY: |
| case ELF::SHT_X86_64_UNWIND: |
| // 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()); |
| } |
| |
| bool ELFObjectWriter::IsELFMetaDataSection(const MCSectionData &SD) { |
| return SD.getOrdinal() == ~UINT32_C(0) && |
| !SD.getSection().isVirtualSection(); |
| } |
| |
| uint64_t ELFObjectWriter::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<MCDataFragment>(F).getContents().size(); |
| } |
| return Ret; |
| } |
| |
| uint64_t ELFObjectWriter::GetSectionFileSize(const MCAsmLayout &Layout, |
| const MCSectionData &SD) { |
| if (IsELFMetaDataSection(SD)) |
| return DataSectionSize(SD); |
| return Layout.getSectionFileSize(&SD); |
| } |
| |
| uint64_t ELFObjectWriter::GetSectionAddressSize(const MCAsmLayout &Layout, |
| const MCSectionData &SD) { |
| if (IsELFMetaDataSection(SD)) |
| return DataSectionSize(SD); |
| return Layout.getSectionAddressSize(&SD); |
| } |
| |
| 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()); |
| 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<MCDataFragment>(F).getContents().str()); |
| } |
| } else { |
| Asm.WriteSectionData(&SD, Layout); |
| } |
| } |
| |
| void ELFObjectWriter::WriteSectionHeader(MCAssembler &Asm, |
| const GroupMapTy &GroupMap, |
| const MCAsmLayout &Layout, |
| const SectionIndexMapTy &SectionIndexMap, |
| const SectionOffsetMapTy &SectionOffsetMap) { |
| const unsigned NumSections = Asm.size() + 1; |
| |
| std::vector<const MCSectionELF*> Sections; |
| Sections.resize(NumSections - 1); |
| |
| for (SectionIndexMapTy::const_iterator i= |
| SectionIndexMap.begin(), e = SectionIndexMap.end(); i != e; ++i) { |
| const std::pair<const MCSectionELF*, uint32_t> &p = *i; |
| Sections[p.second - 1] = p.first; |
| } |
| |
| // Null section first. |
| uint64_t FirstSectionSize = |
| NumSections >= ELF::SHN_LORESERVE ? NumSections : 0; |
| uint32_t FirstSectionLink = |
| ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0; |
| WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0); |
| |
| for (unsigned i = 0; i < NumSections - 1; ++i) { |
| const MCSectionELF &Section = *Sections[i]; |
| const MCSectionData &SD = Asm.getOrCreateSectionData(Section); |
| uint32_t GroupSymbolIndex; |
| if (Section.getType() != ELF::SHT_GROUP) |
| GroupSymbolIndex = 0; |
| else |
| GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm, |
| GroupMap.lookup(&Section)); |
| |
| uint64_t Size = GetSectionAddressSize(Layout, SD); |
| |
| WriteSection(Asm, SectionIndexMap, GroupSymbolIndex, |
| SectionOffsetMap.lookup(&Section), Size, |
| SD.getAlignment(), Section); |
| } |
| } |
| |
| void ELFObjectWriter::ComputeSectionOrder(MCAssembler &Asm, |
| std::vector<const MCSectionELF*> &Sections) { |
| for (MCAssembler::iterator it = Asm.begin(), |
| ie = Asm.end(); it != ie; ++it) { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF &>(it->getSection()); |
| if (Section.getType() == ELF::SHT_GROUP) |
| Sections.push_back(&Section); |
| } |
| |
| for (MCAssembler::iterator it = Asm.begin(), |
| ie = Asm.end(); it != ie; ++it) { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF &>(it->getSection()); |
| if (Section.getType() != ELF::SHT_GROUP && |
| Section.getType() != ELF::SHT_REL && |
| Section.getType() != ELF::SHT_RELA) |
| Sections.push_back(&Section); |
| } |
| |
| for (MCAssembler::iterator it = Asm.begin(), |
| ie = Asm.end(); it != ie; ++it) { |
| const MCSectionELF &Section = |
| static_cast<const MCSectionELF &>(it->getSection()); |
| if (Section.getType() == ELF::SHT_REL || |
| Section.getType() == ELF::SHT_RELA) |
| Sections.push_back(&Section); |
| } |
| } |
| |
| void ELFObjectWriter::WriteObject(MCAssembler &Asm, |
| const MCAsmLayout &Layout) { |
| GroupMapTy GroupMap; |
| RevGroupMapTy RevGroupMap; |
| SectionIndexMapTy SectionIndexMap; |
| |
| unsigned NumUserSections = Asm.size(); |
| |
| DenseMap<const MCSectionELF*, const MCSectionELF*> RelMap; |
| CreateRelocationSections(Asm, const_cast<MCAsmLayout&>(Layout), RelMap); |
| |
| const unsigned NumUserAndRelocSections = Asm.size(); |
| CreateIndexedSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap, |
| RevGroupMap, SectionIndexMap, RelMap); |
| const unsigned AllSections = Asm.size(); |
| const unsigned NumIndexedSections = AllSections - NumUserAndRelocSections; |
| |
| unsigned NumRegularSections = NumUserSections + NumIndexedSections; |
| |
| // Compute symbol table information. |
| ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap, NumRegularSections); |
| |
| |
| WriteRelocations(Asm, const_cast<MCAsmLayout&>(Layout), RelMap); |
| |
| CreateMetadataSections(const_cast<MCAssembler&>(Asm), |
| const_cast<MCAsmLayout&>(Layout), |
| SectionIndexMap, |
| RelMap); |
| |
| uint64_t NaturalAlignment = is64Bit() ? 8 : 4; |
| uint64_t HeaderSize = is64Bit() ? sizeof(ELF::Elf64_Ehdr) : |
| sizeof(ELF::Elf32_Ehdr); |
| uint64_t FileOff = HeaderSize; |
| |
| std::vector<const MCSectionELF*> Sections; |
| ComputeSectionOrder(Asm, Sections); |
| unsigned NumSections = Sections.size(); |
| SectionOffsetMapTy SectionOffsetMap; |
| for (unsigned i = 0; i < NumRegularSections + 1; ++i) { |
| const MCSectionELF &Section = *Sections[i]; |
| const MCSectionData &SD = Asm.getOrCreateSectionData(Section); |
| |
| FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); |
| |
| // Remember the offset into the file for this section. |
| SectionOffsetMap[&Section] = FileOff; |
| |
| // Get the size of the section in the output file (including padding). |
| FileOff += GetSectionFileSize(Layout, SD); |
| } |
| |
| FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); |
| |
| const unsigned SectionHeaderOffset = FileOff - HeaderSize; |
| |
| uint64_t SectionHeaderEntrySize = is64Bit() ? |
| sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr); |
| FileOff += (NumSections + 1) * SectionHeaderEntrySize; |
| |
| for (unsigned i = NumRegularSections + 1; i < NumSections; ++i) { |
| const MCSectionELF &Section = *Sections[i]; |
| const MCSectionData &SD = Asm.getOrCreateSectionData(Section); |
| |
| FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); |
| |
| // Remember the offset into the file for this section. |
| SectionOffsetMap[&Section] = FileOff; |
| |
| // Get the size of the section in the output file (including padding). |
| FileOff += GetSectionFileSize(Layout, SD); |
| } |
| |
| // Write out the ELF header ... |
| WriteHeader(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); |
| 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]); |
| } |
| |
| bool |
| ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm, |
| const MCSymbolData &DataA, |
| const MCFragment &FB, |
| bool InSet, |
| bool IsPCRel) const { |
| if (DataA.getFlags() & ELF_STB_Weak) |
| return false; |
| return MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl( |
| Asm, DataA, FB,InSet, IsPCRel); |
| } |
| |
| MCObjectWriter *llvm::createELFObjectWriter(MCELFObjectTargetWriter *MOTW, |
| raw_ostream &OS, |
| bool IsLittleEndian) { |
| switch (MOTW->getEMachine()) { |
| case ELF::EM_386: |
| case ELF::EM_X86_64: |
| return new X86ELFObjectWriter(MOTW, OS, IsLittleEndian); break; |
| case ELF::EM_ARM: |
| return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break; |
| case ELF::EM_MBLAZE: |
| return new MBlazeELFObjectWriter(MOTW, OS, IsLittleEndian); break; |
| 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; |
| } |
| } |
| |
| |
| /// 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<const MCSectionELF&>(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<bool>(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<bool>(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<bool>(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) { |
| MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ? |
| MCSymbolRefExpr::VK_None : Target.getSymA()->getKind(); |
| |
| unsigned Type = GetRelocTypeInner(Target, Fixup, IsPCRel); |
| |
| if (RelocNeedsGOT(Modifier)) |
| NeedsGOT = true; |
| |
| return Type; |
| } |
| |
| 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) { |
| // 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) { |
| // determine the type of the relocation |
| unsigned Type; |
| if (IsPCRel) { |
| switch ((unsigned)Fixup.getKind()) { |
| default: |
| llvm_unreachable("Unimplemented"); |
| case FK_PCRel_4: |
| Type = ELF::R_MICROBLAZE_64_PCREL; |
| break; |
| case FK_PCRel_2: |
| Type = ELF::R_MICROBLAZE_32_PCREL; |
| break; |
| } |
| } else { |
| switch ((unsigned)Fixup.getKind()) { |
| default: llvm_unreachable("invalid fixup kind!"); |
| case FK_Data_4: |
| Type = ((IsRelocWithSymbol || Addend !=0) |
| ? ELF::R_MICROBLAZE_32 |
| : ELF::R_MICROBLAZE_64); |
| break; |
| case FK_Data_2: |
| Type = ELF::R_MICROBLAZE_32; |
| break; |
| } |
| } |
| return Type; |
| } |
| |
| //===- X86ELFObjectWriter -------------------------------------------===// |
| |
| |
| X86ELFObjectWriter::X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW, |
| raw_ostream &_OS, |
| bool IsLittleEndian) |
| : ELFObjectWriter(MOTW, _OS, IsLittleEndian) |
| {} |
| |
| X86ELFObjectWriter::~X86ELFObjectWriter() |
| {} |
| |
| unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target, |
| const MCFixup &Fixup, |
| bool IsPCRel, |
| bool IsRelocWithSymbol, |
| int64_t Addend) { |
| // determine the type of the relocation |
| |
| MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ? |
| MCSymbolRefExpr::VK_None : Target.getSymA()->getKind(); |
| unsigned Type; |
| if (is64Bit()) { |
| if (IsPCRel) { |
| switch ((unsigned)Fixup.getKind()) { |
| default: llvm_unreachable("invalid fixup kind!"); |
| |
| case FK_Data_8: Type = ELF::R_X86_64_PC64; break; |
| case FK_Data_4: Type = ELF::R_X86_64_PC32; break; |
| case FK_Data_2: Type = ELF::R_X86_64_PC16; break; |
| |
| case FK_PCRel_8: |
| assert(Modifier == MCSymbolRefExpr::VK_None); |
| Type = ELF::R_X86_64_PC64; |
| break; |
| case X86::reloc_signed_4byte: |
| case X86::reloc_riprel_4byte_movq_load: |
| case X86::reloc_riprel_4byte: |
| case FK_PCRel_4: |
| switch (Modifier) { |
| default: |
| llvm_unreachable("Unimplemented"); |
| case MCSymbolRefExpr::VK_None: |
| Type = ELF::R_X86_64_PC32; |
| break; |
| case MCSymbolRefExpr::VK_PLT: |
| Type = ELF::R_X86_64_PLT32; |
| break; |
| case MCSymbolRefExpr::VK_GOTPCREL: |
| Type = ELF::R_X86_64_GOTPCREL; |
| break; |
| case MCSymbolRefExpr::VK_GOTTPOFF: |
| Type = ELF::R_X86_64_GOTTPOFF; |
| break; |
| case MCSymbolRefExpr::VK_TLSGD: |
| Type = ELF::R_X86_64_TLSGD; |
| break; |
| case MCSymbolRefExpr::VK_TLSLD: |
| Type = ELF::R_X86_64_TLSLD; |
| break; |
| } |
| break; |
| case FK_PCRel_2: |
| assert(Modifier == MCSymbolRefExpr::VK_None); |
| Type = ELF::R_X86_64_PC16; |
| break; |
| case FK_PCRel_1: |
| assert(Modifier == MCSymbolRefExpr::VK_None); |
| Type = ELF::R_X86_64_PC8; |
| break; |
| } |
| } else { |
| switch ((unsigned)Fixup.getKind()) { |
| default: llvm_unreachable("invalid fixup kind!"); |
| case FK_Data_8: Type = ELF::R_X86_64_64; break; |
| case X86::reloc_signed_4byte: |
| 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; |
| case MCSymbolRefExpr::VK_GOTTPOFF: |
| Type = ELF::R_386_TLS_IE_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; |
| } |
| |
| MipsELFObjectWriter::MipsELFObjectWriter(MCELFObjectTargetWriter *MOTW, |
| raw_ostream &_OS, |
| bool IsLittleEndian) |
| : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {} |
| |
| MipsELFObjectWriter::~MipsELFObjectWriter() {} |
| |
| unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target, |
| const MCFixup &Fixup, |
| bool IsPCRel, |
| bool IsRelocWithSymbol, |
| int64_t Addend) { |
| // tbd |
| return 1; |
| } |