Merge upstream r127116

1 files changed, 487 insertions, 575 deletions

diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index b15c2d4..3492cbc 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -11,73 +11,35 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ADT/SmallPtrSet.h"
+#include "ELFObjectWriter.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/Twine.h"
-#include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCAsmLayout.h"
 #include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCELFSymbolFlags.h"
 #include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCSectionELF.h"
-#include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCValue.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/ADT/StringSwitch.h"
 
 #include "../Target/X86/X86FixupKinds.h"
+#include "../Target/ARM/ARMFixupKinds.h"
 
 #include <vector>
 using namespace llvm;
 
-static unsigned GetType(const MCSymbolData &SD) {
-  uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift;
-  assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
-         Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
-         Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
-         Type == ELF::STT_TLS);
-  return Type;
-}
-
-static unsigned GetBinding(const MCSymbolData &SD) {
-  uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift;
-  assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
-         Binding == ELF::STB_WEAK);
-  return Binding;
-}
-
-static void SetBinding(MCSymbolData &SD, unsigned Binding) {
-  assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
-         Binding == ELF::STB_WEAK);
-  uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
-  SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
-}
+bool ELFObjectWriter::isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind) {
+  const MCFixupKindInfo &FKI =
+    Asm.getBackend().getFixupKindInfo((MCFixupKind) Kind);
 
-static unsigned GetVisibility(MCSymbolData &SD) {
-  unsigned Visibility =
-    (SD.getFlags() & (0xf << ELF_STV_Shift)) >> ELF_STV_Shift;
-  assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
-         Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
-  return Visibility;
+  return FKI.Flags & MCFixupKindInfo::FKF_IsPCRel;
 }
 
-static bool isFixupKindX86PCRel(unsigned Kind) {
-  switch (Kind) {
-  default:
-    return false;
-  case X86::reloc_pcrel_1byte:
-  case X86::reloc_pcrel_4byte:
-  case X86::reloc_riprel_4byte:
-  case X86::reloc_riprel_4byte_movq_load:
-    return true;
-  }
-}
-
-static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) {
+bool ELFObjectWriter::RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) {
   switch (Variant) {
   default:
     return false;
@@ -97,294 +59,6 @@ static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) {
   }
 }
 
-namespace {
-  class ELFObjectWriter : public MCObjectWriter {
-  protected:
-    /*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;
-
-      // Support lexicographic sorting.
-      bool operator<(const ELFSymbolData &RHS) const {
-        if (GetType(*SymbolData) == ELF::STT_FILE)
-          return true;
-        if (GetType(*RHS.SymbolData) == ELF::STT_FILE)
-          return false;
-        return SymbolData->getSymbol().getName() <
-               RHS.SymbolData->getSymbol().getName();
-      }
-    };
-
-    /// @name Relocation Data
-    /// @{
-
-    struct ELFRelocationEntry {
-      // Make these big enough for both 32-bit and 64-bit
-      uint64_t r_offset;
-      int Index;
-      unsigned Type;
-      const MCSymbol *Symbol;
-      uint64_t r_addend;
-
-      // Support lexicographic sorting.
-      bool operator<(const ELFRelocationEntry &RE) const {
-        return RE.r_offset < r_offset;
-      }
-    };
-
-    SmallPtrSet<const MCSymbol *, 16> UsedInReloc;
-    SmallPtrSet<const MCSymbol *, 16> WeakrefUsedInReloc;
-    DenseMap<const MCSymbol *, const MCSymbol *> Renames;
-
-    llvm::DenseMap<const MCSectionData*,
-                   std::vector<ELFRelocationEntry> > Relocations;
-    DenseMap<const MCSection*, uint64_t> SectionStringTableIndex;
-
-    /// @}
-    /// @name Symbol Table Data
-    /// @{
-
-    SmallString<256> StringTable;
-    std::vector<ELFSymbolData> LocalSymbolData;
-    std::vector<ELFSymbolData> ExternalSymbolData;
-    std::vector<ELFSymbolData> UndefinedSymbolData;
-
-    /// @}
-
-    bool NeedsGOT;
-
-    bool NeedsSymtabShndx;
-
-    unsigned Is64Bit : 1;
-
-    bool HasRelocationAddend;
-
-    Triple::OSType OSType;
-
-    uint16_t EMachine;
-
-    // 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;
-
-
-    const MCSymbol *SymbolToReloc(const MCAssembler &Asm,
-                                  const MCValue &Target,
-                                  const MCFragment &F) const;
-
-  public:
-    ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
-                    uint16_t _EMachine, bool _HasRelAddend,
-                    Triple::OSType _OSType)
-      : MCObjectWriter(_OS, IsLittleEndian),
-        NeedsGOT(false), NeedsSymtabShndx(false),
-        Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend),
-        OSType(_OSType), EMachine(_EMachine) {
-    }
-
-    virtual ~ELFObjectWriter();
-
-    void WriteWord(uint64_t W) {
-      if (Is64Bit)
-        Write64(W);
-      else
-        Write32(W);
-    }
-
-    void StringLE16(char *buf, uint16_t Value) {
-      buf[0] = char(Value >> 0);
-      buf[1] = char(Value >> 8);
-    }
-
-    void StringLE32(char *buf, uint32_t Value) {
-      StringLE16(buf, uint16_t(Value >> 0));
-      StringLE16(buf + 2, uint16_t(Value >> 16));
-    }
-
-    void StringLE64(char *buf, uint64_t Value) {
-      StringLE32(buf, uint32_t(Value >> 0));
-      StringLE32(buf + 4, uint32_t(Value >> 32));
-    }
-
-    void StringBE16(char *buf ,uint16_t Value) {
-      buf[0] = char(Value >> 8);
-      buf[1] = char(Value >> 0);
-    }
-
-    void StringBE32(char *buf, uint32_t Value) {
-      StringBE16(buf, uint16_t(Value >> 16));
-      StringBE16(buf + 2, uint16_t(Value >> 0));
-    }
-
-    void StringBE64(char *buf, uint64_t Value) {
-      StringBE32(buf, uint32_t(Value >> 32));
-      StringBE32(buf + 4, uint32_t(Value >> 0));
-    }
-
-    void String8(MCDataFragment &F, uint8_t Value) {
-      char buf[1];
-      buf[0] = Value;
-      F.getContents() += StringRef(buf, 1);
-    }
-
-    void String16(MCDataFragment &F, uint16_t Value) {
-      char buf[2];
-      if (isLittleEndian())
-        StringLE16(buf, Value);
-      else
-        StringBE16(buf, Value);
-      F.getContents() += StringRef(buf, 2);
-    }
-
-    void String32(MCDataFragment &F, uint32_t Value) {
-      char buf[4];
-      if (isLittleEndian())
-        StringLE32(buf, Value);
-      else
-        StringBE32(buf, Value);
-      F.getContents() += StringRef(buf, 4);
-    }
-
-    void String64(MCDataFragment &F, uint64_t Value) {
-      char buf[8];
-      if (isLittleEndian())
-        StringLE64(buf, Value);
-      else
-        StringBE64(buf, Value);
-      F.getContents() += StringRef(buf, 8);
-    }
-
-    virtual void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections);
-
-    virtual void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
-                          uint64_t name, uint8_t info,
-                          uint64_t value, uint64_t size,
-                          uint8_t other, uint32_t shndx,
-                          bool Reserved);
-
-    virtual void WriteSymbol(MCDataFragment *SymtabF,  MCDataFragment *ShndxF,
-                     ELFSymbolData &MSD,
-                     const MCAsmLayout &Layout);
-
-    typedef DenseMap<const MCSectionELF*, uint32_t> SectionIndexMapTy;
-    virtual void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
-                          const MCAssembler &Asm,
-                          const MCAsmLayout &Layout,
-                          const SectionIndexMapTy &SectionIndexMap);
-
-    virtual void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
-                          const MCFragment *Fragment, const MCFixup &Fixup,
-                                  MCValue Target, uint64_t &FixedValue) {
-      assert(0 && "RecordRelocation is not specific enough");
-    }
-
-    virtual uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm,
-                                         const MCSymbol *S);
-
-    // Map from a group section to the signature symbol
-    typedef DenseMap<const MCSectionELF*, const MCSymbol*> GroupMapTy;
-    // Map from a signature symbol to the group section
-    typedef DenseMap<const MCSymbol*, const MCSectionELF*> RevGroupMapTy;
-
-    /// ComputeSymbolTable - Compute the symbol table data
-    ///
-    /// \param StringTable [out] - The string table data.
-    /// \param StringIndexMap [out] - Map from symbol names to offsets in the
-    /// string table.
-    virtual void ComputeSymbolTable(MCAssembler &Asm,
-                            const SectionIndexMapTy &SectionIndexMap,
-                            RevGroupMapTy RevGroupMap);
-
-    virtual void ComputeIndexMap(MCAssembler &Asm,
-                         SectionIndexMapTy &SectionIndexMap);
-
-    virtual void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout,
-                         const MCSectionData &SD);
-
-    virtual void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) {
-      for (MCAssembler::const_iterator it = Asm.begin(),
-             ie = Asm.end(); it != ie; ++it) {
-        WriteRelocation(Asm, Layout, *it);
-      }
-    }
-
-    virtual void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
-                                const SectionIndexMapTy &SectionIndexMap);
-
-    virtual void CreateGroupSections(MCAssembler &Asm, MCAsmLayout &Layout,
-                             GroupMapTy &GroupMap, RevGroupMapTy &RevGroupMap);
-
-    virtual void ExecutePostLayoutBinding(MCAssembler &Asm);
-
-    virtual void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags,
-                          uint64_t Address, uint64_t Offset,
-                          uint64_t Size, uint32_t Link, uint32_t Info,
-                          uint64_t Alignment, uint64_t EntrySize);
-
-    virtual void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F,
-                                  const MCSectionData *SD);
-
-    virtual bool IsFixupFullyResolved(const MCAssembler &Asm,
-                              const MCValue Target,
-                              bool IsPCRel,
-                              const MCFragment *DF) const;
-
-    virtual void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout);
-    virtual void WriteSection(MCAssembler &Asm,
-                      const SectionIndexMapTy &SectionIndexMap,
-                      uint32_t GroupSymbolIndex,
-                      uint64_t Offset, uint64_t Size, uint64_t Alignment,
-                      const MCSectionELF &Section);
-  };
-
-  //===- X86ELFObjectWriter -------------------------------------------===//
-
-  class X86ELFObjectWriter : public ELFObjectWriter {
-  public:
-    X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
-                       uint16_t _EMachine, bool _HasRelAddend,
-                       Triple::OSType _OSType);
-    
-    virtual ~X86ELFObjectWriter();
-    virtual void RecordRelocation(const MCAssembler &Asm,
-                                  const MCAsmLayout &Layout,
-                                  const MCFragment *Fragment,
-                                  const MCFixup &Fixup, MCValue Target,
-                                  uint64_t &FixedValue);
-  };
-
-
-  //===- ARMELFObjectWriter -------------------------------------------===//
-
-  class ARMELFObjectWriter : public ELFObjectWriter {
-  public:
-    ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
-                       uint16_t _EMachine, bool _HasRelAddend,
-                       Triple::OSType _OSType);
-    
-    virtual ~ARMELFObjectWriter();
-    virtual void RecordRelocation(const MCAssembler &Asm,
-                                  const MCAsmLayout &Layout,
-                                  const MCFragment *Fragment,
-                                  const MCFixup &Fixup, MCValue Target,
-                                  uint64_t &FixedValue);
-  };
-}
-
 ELFObjectWriter::~ELFObjectWriter()
 {}
 
@@ -404,14 +78,14 @@ void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize,
   Write8('L');  // e_ident[EI_MAG2]
   Write8('F');  // e_ident[EI_MAG3]
 
-  Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS]
+  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 (OSType) {
+  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;
@@ -422,25 +96,25 @@ void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize,
 
   Write16(ELF::ET_REL);             // e_type
 
-  Write16(EMachine); // e_machine = target
+  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) :
+  WriteWord(SectionDataSize + (is64Bit() ? sizeof(ELF::Elf64_Ehdr) :
             sizeof(ELF::Elf32_Ehdr)));  // e_shoff = sec hdr table off in bytes
 
-  // FIXME: Make this configurable.
-  Write32(0);   // e_flags = whatever the target wants
+  // e_flags = whatever the target wants
+  WriteEFlags();
 
   // e_ehsize = ELF header size
-  Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr));
+  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));
+  Write16(is64Bit() ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr));
 
   // e_shnum     = # of section header ents
   if (NumberOfSections >= ELF::SHN_LORESERVE)
@@ -472,7 +146,7 @@ void ELFObjectWriter::WriteSymbolEntry(MCDataFragment *SymtabF,
   uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ?
     uint16_t(ELF::SHN_XINDEX) : shndx;
 
-  if (Is64Bit) {
+  if (is64Bit()) {
     String32(*SymtabF, name);  // st_name
     String8(*SymtabF, info);   // st_info
     String8(*SymtabF, other);  // st_other
@@ -489,22 +163,32 @@ void ELFObjectWriter::WriteSymbolEntry(MCDataFragment *SymtabF,
   }
 }
 
-static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) {
+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 (MCFragment *FF = Data.getFragment())
-    return Layout.getSymbolAddress(&Data) -
-      Layout.getSectionAddress(FF->getParent());
+  if (Data.getFragment())
+    return Layout.getSymbolOffset(&Data);
 
   return 0;
 }
 
-void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) {
+void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
+                                               const MCAsmLayout &Layout) {
   // The presence of symbol versions causes undefined symbols and
   // versions declared with @@@ to be renamed.
 
@@ -526,7 +210,7 @@ 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());
-    SetBinding(*it, GetBinding(SD));
+    MCELF::SetBinding(*it, MCELF::GetBinding(SD));
 
     StringRef Rest = AliasName.substr(Pos);
     if (!Symbol.isUndefined() && !Rest.startswith("@@@"))
@@ -552,35 +236,24 @@ void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF,
   bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() ||
     Data.getSymbol().isVariable();
 
-  uint8_t Binding = GetBinding(OrigData);
-  uint8_t Visibility = GetVisibility(OrigData);
-  uint8_t Type = GetType(Data);
+  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;
-  const MCExpr *ESize;
 
   assert(!(Data.isCommon() && !Data.isExternal()));
 
-  ESize = Data.getSize();
-  if (Data.getSize()) {
-    MCValue Res;
-    if (ESize->getKind() == MCExpr::Binary) {
-      const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize);
-
-      if (BE->EvaluateAsRelocatable(Res, &Layout)) {
-        assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined());
-        assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined());
-        Size = Res.getConstant();
-      }
-    } else if (ESize->getKind() == MCExpr::Constant) {
-      Size = static_cast<const MCConstantExpr *>(ESize)->getValue();
-    } else {
-      assert(0 && "Unsupported size expression");
-    }
+  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
@@ -631,7 +304,7 @@ void ELFObjectWriter::WriteSymbolTable(MCDataFragment *SymtabF,
             (Data.getFlags() & ELF_STB_Weak)) &&
            "External symbol requires STB_GLOBAL or STB_WEAK flag");
     WriteSymbol(SymtabF, ShndxF, MSD, Layout);
-    if (GetBinding(Data) == ELF::STB_LOCAL)
+    if (MCELF::GetBinding(Data) == ELF::STB_LOCAL)
       LastLocalSymbolIndex++;
   }
 
@@ -639,7 +312,7 @@ void ELFObjectWriter::WriteSymbolTable(MCDataFragment *SymtabF,
     ELFSymbolData &MSD = UndefinedSymbolData[i];
     MCSymbolData &Data = *MSD.SymbolData;
     WriteSymbol(SymtabF, ShndxF, MSD, Layout);
-    if (GetBinding(Data) == ELF::STB_LOCAL)
+    if (MCELF::GetBinding(Data) == ELF::STB_LOCAL)
       LastLocalSymbolIndex++;
   }
 }
@@ -666,9 +339,16 @@ const MCSymbol *ELFObjectWriter::SymbolToReloc(const MCAssembler &Asm,
 
   const MCSectionELF &Section =
     static_cast<const MCSectionELF&>(ASymbol.getSection());
+  const SectionKind secKind = Section.getKind();
 
-  if (Section.getKind().isBSS())
-    return NULL;
+  if (secKind.isBSS())
+    return ExplicitRelSym(Asm, Target, F, true);
+
+  if (secKind.isThreadLocal()) {
+    if (Renamed)
+      return Renamed;
+    return &Symbol;
+  }
 
   MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind();
   const MCSectionELF &Sec2 =
@@ -683,7 +363,7 @@ const MCSymbol *ELFObjectWriter::SymbolToReloc(const MCAssembler &Asm,
     return &Symbol;
   }
 
-  if (Section.getFlags() & MCSectionELF::SHF_MERGE) {
+  if (Section.getFlags() & ELF::SHF_MERGE) {
     if (Target.getConstant() == 0)
       return NULL;
     if (Renamed)
@@ -691,7 +371,72 @@ const MCSymbol *ELFObjectWriter::SymbolToReloc(const MCAssembler &Asm,
     return &Symbol;
   }
 
-  return NULL;
+  return ExplicitRelSym(Asm, Target, F, false);
+}
+
+
+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);
+
+    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();
+
+  if (!hasRelocationAddend())
+    Addend = 0;
+  ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend);
+  Relocations[Fragment->getParent()].push_back(ERE);
 }
 
 
@@ -702,8 +447,9 @@ ELFObjectWriter::getSymbolIndexInSymbolTable(const MCAssembler &Asm,
   return SD.getIndex();
 }
 
-static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
-                       bool Used, bool Renamed) {
+bool ELFObjectWriter::isInSymtab(const MCAssembler &Asm,
+                                 const MCSymbolData &Data,
+                                 bool Used, bool Renamed) {
   if (Data.getFlags() & ELF_Other_Weakref)
     return false;
 
@@ -719,7 +465,11 @@ static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
     return true;
 
   const MCSymbol &A = Symbol.AliasedSymbol();
-  if (!A.isVariable() && A.isUndefined() && !Data.isCommon())
+  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())
@@ -731,8 +481,8 @@ static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
   return true;
 }
 
-static bool isLocal(const MCSymbolData &Data, bool isSignature,
-                    bool isUsedInReloc) {
+bool ELFObjectWriter::isLocal(const MCSymbolData &Data, bool isSignature,
+                              bool isUsedInReloc) {
   if (Data.isExternal())
     return false;
 
@@ -780,7 +530,7 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm,
     MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name);
     MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym);
     Data.setExternal(true);
-    SetBinding(Data, ELF::STB_GLOBAL);
+    MCELF::SetBinding(Data, ELF::STB_GLOBAL);
   }
 
   // Build section lookup table.
@@ -811,14 +561,14 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm,
     // Undefined symbols are global, but this is the first place we
     // are able to set it.
     bool Local = isLocal(*it, isSignature, Used);
-    if (!Local && GetBinding(*it) == ELF::STB_LOCAL) {
+    if (!Local && MCELF::GetBinding(*it) == ELF::STB_LOCAL) {
       MCSymbolData &SD = Asm.getSymbolData(RefSymbol);
-      SetBinding(*it, ELF::STB_GLOBAL);
-      SetBinding(SD, ELF::STB_GLOBAL);
+      MCELF::SetBinding(*it, ELF::STB_GLOBAL);
+      MCELF::SetBinding(SD, ELF::STB_GLOBAL);
     }
 
     if (RefSymbol.isUndefined() && !Used && WeakrefUsed)
-      SetBinding(*it, ELF::STB_WEAK);
+      MCELF::SetBinding(*it, ELF::STB_WEAK);
 
     if (it->isCommon()) {
       assert(!Local);
@@ -895,28 +645,26 @@ void ELFObjectWriter::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout,
       static_cast<const MCSectionELF&>(SD.getSection());
 
     const StringRef SectionName = Section.getSectionName();
-    std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel";
+    std::string RelaSectionName = hasRelocationAddend() ? ".rela" : ".rel";
     RelaSectionName += SectionName;
 
     unsigned EntrySize;
-    if (HasRelocationAddend)
-      EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela);
+    if (hasRelocationAddend())
+      EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela);
     else
-      EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
+      EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
 
-    RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ?
+    RelaSection = Ctx.getELFSection(RelaSectionName, hasRelocationAddend() ?
                                     ELF::SHT_RELA : ELF::SHT_REL, 0,
                                     SectionKind::getReadOnly(),
                                     EntrySize, "");
 
     MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection);
-    RelaSD.setAlignment(Is64Bit ? 8 : 4);
+    RelaSD.setAlignment(is64Bit() ? 8 : 4);
 
     MCDataFragment *F = new MCDataFragment(&RelaSD);
 
     WriteRelocationsFragment(Asm, F, &SD);
-
-    Asm.AddSectionToTheEnd(*this, RelaSD, Layout);
   }
 }
 
@@ -948,18 +696,20 @@ void ELFObjectWriter::WriteRelocationsFragment(const MCAssembler &Asm,
   for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
     ELFRelocationEntry entry = Relocs[e - i - 1];
 
-    if (entry.Index < 0)
+    if (!entry.Index)
+      ;
+    else if (entry.Index < 0)
       entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol);
     else
-      entry.Index += LocalSymbolData.size() + 1;
-    if (Is64Bit) {
+      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)
+      if (hasRelocationAddend())
         String64(*F, entry.r_addend);
     } else {
       String32(*F, entry.r_offset);
@@ -968,7 +718,7 @@ void ELFObjectWriter::WriteRelocationsFragment(const MCAssembler &Asm,
       ERE32.setSymbolAndType(entry.Index, entry.Type);
       String32(*F, ERE32.r_info);
 
-      if (HasRelocationAddend)
+      if (hasRelocationAddend())
         String32(*F, entry.r_addend);
     }
   }
@@ -980,7 +730,7 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
   MCContext &Ctx = Asm.getContext();
   MCDataFragment *F;
 
-  unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32;
+  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 =
@@ -995,7 +745,7 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
                       SectionKind::getReadOnly(),
                       EntrySize, "");
   MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection);
-  SymtabSD.setAlignment(Is64Bit ? 8 : 4);
+  SymtabSD.setAlignment(is64Bit() ? 8 : 4);
   SymbolTableIndex = Asm.size();
 
   MCSectionData *SymtabShndxSD = NULL;
@@ -1022,14 +772,11 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
   MCDataFragment *ShndxF = NULL;
   if (NeedsSymtabShndx) {
     ShndxF = new MCDataFragment(SymtabShndxSD);
-    Asm.AddSectionToTheEnd(*this, *SymtabShndxSD, Layout);
   }
   WriteSymbolTable(F, ShndxF, Asm, Layout, SectionIndexMap);
-  Asm.AddSectionToTheEnd(*this, SymtabSD, Layout);
 
   F = new MCDataFragment(&StrtabSD);
   F->getContents().append(StringTable.begin(), StringTable.end());
-  Asm.AddSectionToTheEnd(*this, StrtabSD, Layout);
 
   F = new MCDataFragment(&ShstrtabSD);
 
@@ -1061,61 +808,34 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
     F->getContents() += Name;
     F->getContents() += '\x00';
   }
-
-  Asm.AddSectionToTheEnd(*this, ShstrtabSD, Layout);
 }
 
-bool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm,
-                                           const MCValue Target,
-                                           bool IsPCRel,
-                                           const MCFragment *DF) const {
-  // If this is a PCrel relocation, find the section this fixup value is
-  // relative to.
-  const MCSection *BaseSection = 0;
-  if (IsPCRel) {
-    BaseSection = &DF->getParent()->getSection();
-    assert(BaseSection);
-  }
-
-  const MCSection *SectionA = 0;
-  const MCSymbol *SymbolA = 0;
-  if (const MCSymbolRefExpr *A = Target.getSymA()) {
-    SymbolA = &A->getSymbol().AliasedSymbol();
-    SectionA = &SymbolA->getSection();
-  }
-
-  const MCSection *SectionB = 0;
-  if (const MCSymbolRefExpr *B = Target.getSymB()) {
-    SectionB = &B->getSymbol().AliasedSymbol().getSection();
+void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm,
+                                            MCAsmLayout &Layout,
+                                            GroupMapTy &GroupMap,
+                                            RevGroupMapTy &RevGroupMap) {
+  // 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);
   }
 
-  if (!BaseSection)
-    return SectionA == SectionB;
-
-  const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA);
-  if (DataA.isExternal())
-    return false;
-
-  return !SectionB && BaseSection == SectionA;
-}
-
-void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm,
-                                          MCAsmLayout &Layout,
-                                          GroupMapTy &GroupMap,
-                                          RevGroupMapTy &RevGroupMap) {
   // Build the groups
   for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end();
        it != ie; ++it) {
     const MCSectionELF &Section =
       static_cast<const MCSectionELF&>(it->getSection());
-    if (!(Section.getFlags() & MCSectionELF::SHF_GROUP))
+    if (!(Section.getFlags() & ELF::SHF_GROUP))
       continue;
 
     const MCSymbol *SignatureSymbol = Section.getGroup();
     Asm.getOrCreateSymbolData(*SignatureSymbol);
     const MCSectionELF *&Group = RevGroupMap[SignatureSymbol];
     if (!Group) {
-      Group = Asm.getContext().CreateELFGroupSection();
+      Group = Ctx.CreateELFGroupSection();
       MCSectionData &Data = Asm.getOrCreateSectionData(*Group);
       Data.setAlignment(4);
       MCDataFragment *F = new MCDataFragment(&Data);
@@ -1131,7 +851,7 @@ void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm,
        it != ie; ++it, ++Index) {
     const MCSectionELF &Section =
       static_cast<const MCSectionELF&>(it->getSection());
-    if (!(Section.getFlags() & MCSectionELF::SHF_GROUP))
+    if (!(Section.getFlags() & ELF::SHF_GROUP))
       continue;
     const MCSectionELF *Group = RevGroupMap[Section.getGroup()];
     MCSectionData &Data = Asm.getOrCreateSectionData(*Group);
@@ -1139,13 +859,6 @@ void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm,
     MCDataFragment *F = new MCDataFragment(&Data);
     String32(*F, NumGroups + Index);
   }
-
-  for (RevGroupMapTy::const_iterator i = RevGroupMap.begin(),
-         e = RevGroupMap.end(); i != e; ++i) {
-    const MCSectionELF *Group = i->second;
-    MCSectionData &Data = Asm.getOrCreateSectionData(*Group);
-    Asm.AddSectionToTheEnd(*this, Data, Layout);
-  }
 }
 
 void ELFObjectWriter::WriteSection(MCAssembler &Asm,
@@ -1197,8 +910,13 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm,
   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;
 
@@ -1218,12 +936,52 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm,
                    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(ELFObjectWriter *W,
+                                           const MCSectionData &SD) {
+  for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e;
+       ++i) {
+    const MCFragment &F = *i;
+    assert(F.getKind() == MCFragment::FT_Data);
+    W->WriteBytes(cast<MCDataFragment>(F).getContents().str());
+  }
+}
+
 void ELFObjectWriter::WriteObject(MCAssembler &Asm,
                                   const MCAsmLayout &Layout) {
   GroupMapTy GroupMap;
   RevGroupMapTy RevGroupMap;
-  CreateGroupSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
-                      RevGroupMap);
+  CreateIndexedSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
+                        RevGroupMap);
 
   SectionIndexMapTy SectionIndexMap;
 
@@ -1241,8 +999,9 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
 
   // Add 1 for the null section.
   unsigned NumSections = Asm.size() + 1;
-  uint64_t NaturalAlignment = Is64Bit ? 8 : 4;
-  uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr);
+  uint64_t 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;
@@ -1261,9 +1020,7 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
     FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
 
     // Get the size of the section in the output file (including padding).
-    uint64_t Size = Layout.getSectionFileSize(&SD);
-
-    FileOff += Size;
+    FileOff += GetSectionFileSize(Layout, SD);
   }
 
   FileOff = RoundUpToAlignment(FileOff, NaturalAlignment);
@@ -1287,9 +1044,12 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
     // Remember the offset into the file for this section.
     SectionOffsetMap[&Section] = FileOff;
 
-    FileOff += Layout.getSectionFileSize(&SD);
+    FileOff += GetSectionFileSize(Layout, SD);
 
-    Asm.WriteSectionData(&SD, Layout, this);
+    if (IsELFMetaDataSection(SD))
+      WriteDataSectionData(this, SD);
+    else
+      Asm.WriteSectionData(&SD, Layout);
   }
 
   uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment);
@@ -1315,26 +1075,37 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
     else
       GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm, GroupMap[&Section]);
 
+    uint64_t Size = GetSectionAddressSize(Layout, SD);
+
     WriteSection(Asm, SectionIndexMap, GroupSymbolIndex,
-                 SectionOffsetMap[&Section], Layout.getSectionSize(&SD),
+                 SectionOffsetMap[&Section], Size,
                  SD.getAlignment(), Section);
   }
 }
 
-MCObjectWriter *llvm::createELFObjectWriter(raw_ostream &OS,
-                                            bool Is64Bit,
-                                            Triple::OSType OSType,
-                                            uint16_t EMachine,
-                                            bool IsLittleEndian,
-                                            bool HasRelocationAddend) {
-  switch (EMachine) {
+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(OS, Is64Bit, IsLittleEndian, EMachine,
-                                    HasRelocationAddend, OSType); break;
+      return new X86ELFObjectWriter(MOTW, OS, IsLittleEndian); break;
     case ELF::EM_ARM:
-      return new ARMELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine,
-                                    HasRelocationAddend, OSType); break;
+      return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break;
+    case ELF::EM_MBLAZE:
+      return new MBlazeELFObjectWriter(MOTW, OS, IsLittleEndian); break;
     default: llvm_unreachable("Unsupported architecture"); break;
   }
 }
@@ -1343,121 +1114,276 @@ MCObjectWriter *llvm::createELFObjectWriter(raw_ostream &OS,
 /// START OF SUBCLASSES for ELFObjectWriter
 //===- ARMELFObjectWriter -------------------------------------------===//
 
-ARMELFObjectWriter::ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
-                                       bool _IsLittleEndian,
-                                       uint16_t _EMachine, bool _HasRelocationAddend,
-                                       Triple::OSType _OSType)
-  : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
-                    _HasRelocationAddend, _OSType)
+ARMELFObjectWriter::ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+                                       raw_ostream &_OS,
+                                       bool IsLittleEndian)
+  : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
 {}
 
 ARMELFObjectWriter::~ARMELFObjectWriter()
 {}
 
-void ARMELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
-                                          const MCAsmLayout &Layout,
-                                          const MCFragment *Fragment,
-                                          const MCFixup &Fixup,
-                                          MCValue Target,
-                                          uint64_t &FixedValue) {
-  assert(0 && "ARMELFObjectWriter::RecordRelocation() unimplemented");
+// FIXME: get the real EABI Version from the Triple.
+void ARMELFObjectWriter::WriteEFlags() {
+  Write32(ELF::EF_ARM_EABIMASK & DefaultEABIVersion);
 }
 
+// In ARM, _MergedGlobals and other most symbols get emitted directly.
+// I.e. not as an offset to a section symbol.
+// This code is a first-cut approximation of what ARM/gcc does.
 
+const MCSymbol *ARMELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
+                                                   const MCValue &Target,
+                                                   const MCFragment &F,
+                                                   bool IsBSS) const {
+  const MCSymbol &Symbol = Target.getSymA()->getSymbol();
+  bool EmitThisSym = false;
 
-//===- X86ELFObjectWriter -------------------------------------------===//
+  if (IsBSS) {
+    EmitThisSym = StringSwitch<bool>(Symbol.getName())
+      .Case("_MergedGlobals", true)
+      .Default(false);
+  } else {
+    EmitThisSym = StringSwitch<bool>(Symbol.getName())
+      .Case("_MergedGlobals", true)
+      .StartsWith(".L.str", true)
+      .Default(false);
+  }
+  if (EmitThisSym)
+    return &Symbol;
+  if (! Symbol.isTemporary())
+    return &Symbol;
+  return NULL;
+}
 
+unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
+                                          const MCFixup &Fixup,
+                                          bool IsPCRel,
+                                          bool IsRelocWithSymbol,
+                                          int64_t Addend) {
+  MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
+    MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
 
-X86ELFObjectWriter::X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
-                                       bool _IsLittleEndian,
-                                       uint16_t _EMachine, bool _HasRelocationAddend,
-                                       Triple::OSType _OSType)
-  : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
-                    _HasRelocationAddend, _OSType)
-{}
+  unsigned Type = 0;
+  if (IsPCRel) {
+    switch ((unsigned)Fixup.getKind()) {
+    default: assert(0 && "Unimplemented");
+    case FK_Data_4:
+      switch (Modifier) {
+      default: llvm_unreachable("Unsupported Modifier");
+      case MCSymbolRefExpr::VK_None:
+        Type = ELF::R_ARM_BASE_PREL;
+        break;
+      case MCSymbolRefExpr::VK_ARM_TLSGD:
+        assert(0 && "unimplemented");
+        break;
+      case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
+        Type = ELF::R_ARM_TLS_IE32;
+        break;
+      }
+      break;
+    case ARM::fixup_arm_uncondbranch:
+      switch (Modifier) {
+      case MCSymbolRefExpr::VK_ARM_PLT:
+        Type = ELF::R_ARM_PLT32;
+        break;
+      default:
+        Type = ELF::R_ARM_CALL;
+        break;
+      }
+      break;
+    case ARM::fixup_arm_condbranch:
+      Type = ELF::R_ARM_JUMP24;
+      break;
+    case ARM::fixup_arm_movt_hi16:
+    case ARM::fixup_arm_movt_hi16_pcrel:
+      Type = ELF::R_ARM_MOVT_PREL;
+      break;
+    case ARM::fixup_arm_movw_lo16:
+    case ARM::fixup_arm_movw_lo16_pcrel:
+      Type = ELF::R_ARM_MOVW_PREL_NC;
+      break;
+    case ARM::fixup_t2_movt_hi16:
+    case ARM::fixup_t2_movt_hi16_pcrel:
+      Type = ELF::R_ARM_THM_MOVT_PREL;
+      break;
+    case ARM::fixup_t2_movw_lo16:
+    case ARM::fixup_t2_movw_lo16_pcrel:
+      Type = ELF::R_ARM_THM_MOVW_PREL_NC;
+      break;
+    }
+  } else {
+    switch ((unsigned)Fixup.getKind()) {
+    default: llvm_unreachable("invalid fixup kind!");
+    case FK_Data_4:
+      switch (Modifier) {
+      default: llvm_unreachable("Unsupported Modifier"); break;
+      case MCSymbolRefExpr::VK_ARM_GOT:
+        Type = ELF::R_ARM_GOT_BREL;
+        break;
+      case MCSymbolRefExpr::VK_ARM_TLSGD:
+        Type = ELF::R_ARM_TLS_GD32;
+        break;
+      case MCSymbolRefExpr::VK_ARM_TPOFF:
+        Type = ELF::R_ARM_TLS_LE32;
+        break;
+      case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
+        Type = ELF::R_ARM_TLS_IE32;
+        break;
+      case MCSymbolRefExpr::VK_None:
+        Type = ELF::R_ARM_ABS32;
+        break;
+      case MCSymbolRefExpr::VK_ARM_GOTOFF:
+        Type = ELF::R_ARM_GOTOFF32;
+        break;
+      }
+      break;
+    case ARM::fixup_arm_ldst_pcrel_12:
+    case ARM::fixup_arm_pcrel_10:
+    case ARM::fixup_arm_adr_pcrel_12:
+    case ARM::fixup_arm_thumb_bl:
+    case ARM::fixup_arm_thumb_cb:
+    case ARM::fixup_arm_thumb_cp:
+    case ARM::fixup_arm_thumb_br:
+      assert(0 && "Unimplemented");
+      break;
+    case ARM::fixup_arm_uncondbranch:
+      Type = ELF::R_ARM_CALL;
+      break;
+    case ARM::fixup_arm_condbranch:
+      Type = ELF::R_ARM_JUMP24;
+      break;
+    case ARM::fixup_arm_movt_hi16:
+      Type = ELF::R_ARM_MOVT_ABS;
+      break;
+    case ARM::fixup_arm_movw_lo16:
+      Type = ELF::R_ARM_MOVW_ABS_NC;
+      break;
+    case ARM::fixup_t2_movt_hi16:
+      Type = ELF::R_ARM_THM_MOVT_ABS;
+      break;
+    case ARM::fixup_t2_movw_lo16:
+      Type = ELF::R_ARM_THM_MOVW_ABS_NC;
+      break;
+    }
+  }
 
-X86ELFObjectWriter::~X86ELFObjectWriter()
-{}
+  if (RelocNeedsGOT(Modifier))
+    NeedsGOT = true;
 
-void X86ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
-                                       const MCAsmLayout &Layout,
-                                       const MCFragment *Fragment,
-                                       const MCFixup &Fixup,
-                                       MCValue Target,
-                                       uint64_t &FixedValue) {
-  int64_t Addend = 0;
-  int Index = 0;
-  int64_t Value = Target.getConstant();
-  const MCSymbol &Symbol = Target.getSymA()->getSymbol();
-  const MCSymbol &ASymbol = Symbol.AliasedSymbol();
-  const MCSymbol *RelocSymbol = SymbolToReloc(Asm, Target, *Fragment);
+  return Type;
+}
 
-  bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind());
-  if (!Target.isAbsolute()) {
-    if (const MCSymbolRefExpr *RefB = Target.getSymB()) {
-      const MCSymbol &SymbolB = RefB->getSymbol();
-      MCSymbolData &SDB = Asm.getSymbolData(SymbolB);
-      IsPCRel = true;
-      MCSectionData *Sec = Fragment->getParent();
+//===- MBlazeELFObjectWriter -------------------------------------------===//
 
-      // Offset of the symbol in the section
-      int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec);
+MBlazeELFObjectWriter::MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+                                             raw_ostream &_OS,
+                                             bool IsLittleEndian)
+  : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {
+}
 
-      // Ofeset of the relocation in the section
-      int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
-      Value += b - a;
+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;
+}
 
-    if (!RelocSymbol) {
-      MCSymbolData &SD = Asm.getSymbolData(ASymbol);
-      MCFragment *F = SD.getFragment();
+//===- X86ELFObjectWriter -------------------------------------------===//
 
-      Index = F->getParent()->getOrdinal();
 
-      MCSectionData *FSD = F->getParent();
-      // Offset of the symbol in the section
-      Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD);
-    } 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;
-  }
+X86ELFObjectWriter::X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+                                       raw_ostream &_OS,
+                                       bool IsLittleEndian)
+  : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
+{}
 
-  FixedValue = Value;
+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.getSymA()->getKind();
+  MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
+    MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
   unsigned Type;
-  if (Is64Bit) {
+  if (is64Bit()) {
     if (IsPCRel) {
-      switch (Modifier) {
-      default:
-        llvm_unreachable("Unimplemented");
-      case MCSymbolRefExpr::VK_None:
-        Type = ELF::R_X86_64_PC32;
-        break;
-      case MCSymbolRefExpr::VK_PLT:
-        Type = ELF::R_X86_64_PLT32;
+      switch ((unsigned)Fixup.getKind()) {
+      default: llvm_unreachable("invalid fixup kind!");
+      case FK_PCRel_8:
+        assert(Modifier == MCSymbolRefExpr::VK_None);
+        Type = ELF::R_X86_64_PC64;
         break;
-      case MCSymbolRefExpr::VK_GOTPCREL:
-        Type = ELF::R_X86_64_GOTPCREL;
+      case X86::reloc_signed_4byte:
+      case X86::reloc_riprel_4byte_movq_load:
+      case FK_Data_4: // FIXME?
+      case X86::reloc_riprel_4byte:
+      case FK_PCRel_4:
+        switch (Modifier) {
+        default:
+          llvm_unreachable("Unimplemented");
+        case MCSymbolRefExpr::VK_None:
+          Type = ELF::R_X86_64_PC32;
+          break;
+        case MCSymbolRefExpr::VK_PLT:
+          Type = ELF::R_X86_64_PLT32;
+          break;
+        case MCSymbolRefExpr::VK_GOTPCREL:
+          Type = ELF::R_X86_64_GOTPCREL;
+          break;
+        case MCSymbolRefExpr::VK_GOTTPOFF:
+          Type = ELF::R_X86_64_GOTTPOFF;
         break;
-      case MCSymbolRefExpr::VK_GOTTPOFF:
-        Type = ELF::R_X86_64_GOTTPOFF;
+        case MCSymbolRefExpr::VK_TLSGD:
+          Type = ELF::R_X86_64_TLSGD;
+          break;
+        case MCSymbolRefExpr::VK_TLSLD:
+          Type = ELF::R_X86_64_TLSLD;
+          break;
+        }
         break;
-      case MCSymbolRefExpr::VK_TLSGD:
-        Type = ELF::R_X86_64_TLSGD;
+      case FK_PCRel_2:
+        assert(Modifier == MCSymbolRefExpr::VK_None);
+        Type = ELF::R_X86_64_PC16;
         break;
-      case MCSymbolRefExpr::VK_TLSLD:
-        Type = ELF::R_X86_64_TLSLD;
+      case FK_PCRel_1:
+        assert(Modifier == MCSymbolRefExpr::VK_None);
+        Type = ELF::R_X86_64_PC8;
         break;
       }
     } else {
@@ -1465,7 +1391,6 @@ void X86ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
       default: llvm_unreachable("invalid fixup kind!");
       case FK_Data_8: Type = ELF::R_X86_64_64; break;
       case X86::reloc_signed_4byte:
-      case X86::reloc_pcrel_4byte:
         assert(isInt<32>(Target.getConstant()));
         switch (Modifier) {
         default:
@@ -1491,7 +1416,7 @@ void X86ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
         Type = ELF::R_X86_64_32;
         break;
       case FK_Data_2: Type = ELF::R_X86_64_16; break;
-      case X86::reloc_pcrel_1byte:
+      case FK_PCRel_1:
       case FK_Data_1: Type = ELF::R_X86_64_8; break;
       }
     }
@@ -1518,7 +1443,7 @@ void X86ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
       // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
       // instead?
       case X86::reloc_signed_4byte:
-      case X86::reloc_pcrel_4byte:
+      case FK_PCRel_4:
       case FK_Data_4:
         switch (Modifier) {
         default:
@@ -1556,7 +1481,7 @@ void X86ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
         }
         break;
       case FK_Data_2: Type = ELF::R_386_16; break;
-      case X86::reloc_pcrel_1byte:
+      case FK_PCRel_1:
       case FK_Data_1: Type = ELF::R_386_8; break;
       }
     }
@@ -1565,18 +1490,5 @@ void X86ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
   if (RelocNeedsGOT(Modifier))
     NeedsGOT = true;
 
-  ELFRelocationEntry ERE;
-
-  ERE.Index = Index;
-  ERE.Type = Type;
-  ERE.Symbol = RelocSymbol;
-
-  ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
-
-  if (HasRelocationAddend)
-    ERE.r_addend = Addend;
-  else
-    ERE.r_addend = 0; // Silence compiler warning.
-
-  Relocations[Fragment->getParent()].push_back(ERE);
+  return Type;
 }