Initial JIT support for ARM by Raul Fernandes Herbster.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40887 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARM.td

@@ -102,11 +102,13 @@ def ARMInstrInfo : InstrInfo {
   let TSFlagsFields = ["AddrModeBits",
                        "SizeFlag",
                        "IndexModeBits",
-                       "Opcode"];
+                       "Opcode",
+                       "Form"];
   let TSFlagsShifts = [0,
                        4,
                        7,
-                       9];
+                       9,
+                       13];
 }
 
 //===----------------------------------------------------------------------===//

lib/Target/ARM/ARMCodeEmitter.cpp

@@ -16,6 +16,8 @@
 #include "ARMInstrInfo.h"
 #include "ARMSubtarget.h"
 #include "ARMTargetMachine.h"
+#include "ARMRelocations.h"
+#include "ARMAddressingModes.h"
 #include "ARM.h"
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/MachineCodeEmitter.h"
@@ -52,8 +54,19 @@ namespace {
     }
 
     void emitInstruction(const MachineInstr &MI);
+    unsigned getBinaryCodeForInstr(const MachineInstr &MI);
+    int getMachineOpValue(const MachineInstr &MI, unsigned OpIndex);
+    unsigned getBaseOpcodeFor(const TargetInstrDescriptor *TID);
+
+    void emitGlobalAddressForCall(GlobalValue *GV, bool DoesntNeedStub);
+    void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
+    void emitConstPoolAddress(unsigned CPI, unsigned Reloc,
+                              int Disp = 0, unsigned PCAdj = 0 );
+    void emitJumpTableAddress(unsigned JTI, unsigned Reloc,
+                              unsigned PCAdj = 0);
 
   private:
+    int getShiftOp(const MachineOperand &MO);
 
   };
   char Emitter::ID = 0;
@@ -87,6 +100,437 @@ bool Emitter::runOnMachineFunction(MachineFunction &MF) {
   return false;
 }
 
+unsigned Emitter::getBaseOpcodeFor(const TargetInstrDescriptor *TID) {
+  return (TID->TSFlags & ARMII::OpcodeMask) >> ARMII::OpcodeShift;
+}
+
+int Emitter::getShiftOp(const MachineOperand &MO) {
+  unsigned ShiftOp = 0x0;
+  switch(ARM_AM::getAM2ShiftOpc(MO.getImmedValue())) {
+  default: assert(0 && "Unknown shift opc!");
+  case ARM_AM::asr:
+    ShiftOp = 0X2;
+    break;
+  case ARM_AM::lsl:
+    ShiftOp = 0X0;
+    break;
+  case ARM_AM::lsr:
+    ShiftOp = 0X1;
+    break;
+  case ARM_AM::ror:
+  case ARM_AM::rrx:
+    ShiftOp = 0X3;
+    break;
+  }
+  return ShiftOp;
+}
+
+int Emitter::getMachineOpValue(const MachineInstr &MI, unsigned OpIndex) {
+  intptr_t rv = 0;
+  const MachineOperand &MO = MI.getOperand(OpIndex);
+  if (MO.isRegister()) {
+    assert(MRegisterInfo::isPhysicalRegister(MO.getReg()));
+    rv = ARMRegisterInfo::getRegisterNumbering(MO.getReg());
+  } else if (MO.isImmediate()) {
+    rv = MO.getImmedValue();
+  } else if (MO.isGlobalAddress() || MO.isExternalSymbol() ||
+             MO.isConstantPoolIndex() || MO.isJumpTableIndex()) {
+
+    if (MO.isGlobalAddress()) {
+      emitGlobalAddressForCall(MO.getGlobal(), true);
+    } else if (MO.isExternalSymbol()) {
+      emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_relative);
+    } else if (MO.isConstantPoolIndex()) {
+      emitConstPoolAddress(MO.getConstantPoolIndex(), ARM::reloc_arm_relative);
+    } else if (MO.isJumpTableIndex()) {
+      emitJumpTableAddress(MO.getJumpTableIndex(), ARM::reloc_arm_relative);
+    }
+
+  }
+  return rv;
+}
+
+/// emitGlobalAddressForCall - Emit the specified address to the code stream
+/// assuming this is part of a function call, which is PC relative.
+///
+void Emitter::emitGlobalAddressForCall(GlobalValue *GV, bool DoesntNeedStub) {
+  MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
+                                      ARM::reloc_arm_branch, GV, 0,
+                                      DoesntNeedStub));
+}
+
+/// emitExternalSymbolAddress - Arrange for the address of an external symbol to
+/// be emitted to the current location in the function, and allow it to be PC
+/// relative.
+void Emitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
+  MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
+                                                 Reloc, ES));
+}
+
+/// emitConstPoolAddress - Arrange for the address of an constant pool
+/// to be emitted to the current location in the function, and allow it to be PC
+/// relative.
+void Emitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc,
+                                   int Disp /* = 0 */,
+                                   unsigned PCAdj /* = 0 */) {
+  MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
+                                                    Reloc, CPI, PCAdj));
+}
+
+/// emitJumpTableAddress - Arrange for the address of a jump table to
+/// be emitted to the current location in the function, and allow it to be PC
+/// relative.
+void Emitter::emitJumpTableAddress(unsigned JTI, unsigned Reloc,
+                                   unsigned PCAdj /* = 0 */) {
+  MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
+                                                    Reloc, JTI, PCAdj));
+}
+
+
+
 void Emitter::emitInstruction(const MachineInstr &MI) {
   NumEmitted++;  // Keep track of the # of mi's emitted
+  MCE.emitWordLE(getBinaryCodeForInstr(MI));
+}
+
+unsigned Emitter::getBinaryCodeForInstr(const MachineInstr &MI) {
+  const TargetInstrDescriptor *Desc = MI.getInstrDescriptor();
+  const unsigned opcode = MI.getOpcode();
+  unsigned Value = 0xE0000000;
+  unsigned op;
+
+  switch (Desc->TSFlags & ARMII::AddrModeMask) {
+  case ARMII::AddrModeNone: {
+    switch(Desc->TSFlags & ARMII::FormMask) {
+    default: {
+      assert(0 && "Unknown instruction subtype!");
+      if(opcode == ARM::CLZ) {
+        // set first operand
+        op = getMachineOpValue(MI,0);
+        Value |= op << 12;
+
+        // set second operand
+        op = getMachineOpValue(MI,1);
+        Value |= op;
+      }
+      break;
+    }
+    case ARMII::MulFrm: {
+      Value |= 9 << 4;
+
+      unsigned char BaseOpcode = getBaseOpcodeFor(Desc);
+      Value |= BaseOpcode << 20;
+
+      bool isMUL = opcode == ARM::MUL;
+      bool isMLA = opcode == ARM::MLA;
+
+      // set first operand
+      op = getMachineOpValue(MI,0);
+      Value |= op << (isMUL || isMLA ? 16 : 12);
+
+      // set second operand
+      op = getMachineOpValue(MI,1);
+      Value |= op << (isMUL || isMLA ? 0 : 16);
+
+      // set third operand
+      op = getMachineOpValue(MI,2);
+      Value |= op << (isMUL || isMLA ? 8 : 0);
+
+      if (!isMUL) {
+        op = getMachineOpValue(MI,3);
+        Value |= op << (isMLA ? 12 : 8);
+      }
+
+      break;
+    }
+    case ARMII::Branch: {
+      unsigned BaseOpcode = getBaseOpcodeFor(Desc);
+      Value |= BaseOpcode << 24;
+
+      op = getMachineOpValue(MI,0);
+      Value |= op;
+
+      break;
+    }
+    case ARMII::BranchMisc: {
+      unsigned char BaseOpcode = getBaseOpcodeFor(Desc);
+      Value |= BaseOpcode << 4;
+      Value |= 0x12fff << 8;
+
+      if (opcode == ARM::BX_RET)
+        op = 0xe;
+      else 
+        op = getMachineOpValue(MI,0);
+      Value |= op;
+
+      break;
+    }
+    case ARMII::Pseudo:
+      break;
+    }
+
+    break;
+  }
+  case ARMII::AddrMode1: {
+    unsigned char BaseOpcode = getBaseOpcodeFor(Desc);
+    Value |= BaseOpcode << 21;
+
+    unsigned Format = (Desc->TSFlags & ARMII::FormMask);
+    if (Format == ARMII::DPRdMisc) {
+      Value |= getMachineOpValue(MI,0) << 12;
+      Value |= getMachineOpValue(MI,1);
+      switch(opcode) {
+      case ARM::MOVsra_flag: {
+        Value |= 0x1 << 6;
+        Value |= 0x1 << 7;
+        break;
+      }
+      case ARM::MOVsrl_flag: {
+        Value |= 0x1 << 5;
+        Value |= 0x1 << 7;
+        break;
+      }
+      case ARM::MOVrx: {
+        Value |= 0x3 << 5;
+        break;
+      }
+      }
+      break;
+    }
+
+    bool IsDataProcessing3 = false;
+
+    if (Format == ARMII::DPRImS || Format == ARMII::DPRRegS ||
+        Format == ARMII::DPRSoRegS) {
+      Value |= 1 << 20;
+      IsDataProcessing3 = true;
+    }
+
+    bool IsDataProcessing1 = Format == ARMII::DPRdIm    ||
+                             Format == ARMII::DPRdReg   ||
+                             Format == ARMII::DPRdSoReg;
+    bool IsDataProcessing2 = Format == ARMII::DPRnIm    ||
+                             Format == ARMII::DPRnReg   ||
+                             Format == ARMII::DPRnSoReg;
+    IsDataProcessing3 = Format == ARMII::DPRIm     ||
+                        Format == ARMII::DPRReg    ||
+                        Format == ARMII::DPRSoReg  ||
+                        IsDataProcessing3;
+
+    // set first operand
+    op = getMachineOpValue(MI,0);
+    if (IsDataProcessing1 || IsDataProcessing3) {
+      Value |= op << 12;
+    } else if (IsDataProcessing2) {
+      Value |= op << 16;
+    }
+
+    if (IsDataProcessing3) {
+      op = getMachineOpValue(MI,1);
+      Value |= op << 16;
+    }
+
+    unsigned OperandIndex = IsDataProcessing3 ? 2 : 1;
+    // set shift operand
+    switch (Format) {
+    case ARMII::DPRdIm: case ARMII::DPRnIm:
+    case ARMII::DPRIm:  case ARMII::DPRImS: {
+      Value |= 1 << 25;
+      const MachineOperand &MO = MI.getOperand(OperandIndex);
+      op = ARM_AM::getSOImmVal(MO.getImmedValue());
+      Value |= op;
+
+      break;
+    }
+    case ARMII::DPRdReg: case ARMII::DPRnReg:
+    case ARMII::DPRReg:  case ARMII::DPRRegS: {
+      op = getMachineOpValue(MI,OperandIndex);
+      Value |= op;
+
+      break;
+    }
+    case ARMII::DPRdSoReg: case ARMII::DPRnSoReg:
+    case ARMII::DPRSoReg:  case ARMII::DPRSoRegS: {
+      op = getMachineOpValue(MI,OperandIndex);
+      Value |= op;
+
+      const MachineOperand &MO1 = MI.getOperand(OperandIndex + 1);
+      const MachineOperand &MO2 = MI.getOperand(OperandIndex + 2);
+      bool IsShiftByRegister = MO1.getReg() > 0;
+      switch(ARM_AM::getSORegShOp(MO2.getImmedValue())) {
+        default: assert(0 && "Unknown shift opc!");
+        case ARM_AM::asr: {
+          if(IsShiftByRegister)
+            Value |= 0x5 << 4;
+          else
+            Value |= 0x1 << 6;
+          break;
+        }
+        case ARM_AM::lsl: {
+          if(IsShiftByRegister)
+            Value |= 0x1 << 4;
+          break;
+        }
+        case ARM_AM::lsr: {
+          if(IsShiftByRegister)
+            Value |= 0x3 << 4;
+          else
+            Value |= 0x1 << 5;
+          break;
+        }
+        case ARM_AM::ror: {
+          if(IsShiftByRegister)
+            Value |= 0x7 << 4;
+          else
+            Value |= 0x3 << 5;
+          break;
+        }
+        case ARM_AM::rrx: {
+          Value |= 0x3 << 5;
+          break;
+        }
+      }
+      if(ARM_AM::getSORegShOp(MO2.getImmedValue()) != ARM_AM::rrx)
+        if(IsShiftByRegister) {
+          assert(MRegisterInfo::isPhysicalRegister(MO1.getReg()));
+          op = ARMRegisterInfo::getRegisterNumbering(MO1.getReg());
+          assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
+          Value |= op << 8;
+        } else {
+          op = ARM_AM::getSORegOffset(MO2.getImm());
+          Value |= op << 7;
+        }
+      break;
+    }
+    default: assert(false && "Unknown operand type!");
+      break;
+    }
+
+    break;
+  }
+  case ARMII::AddrMode2: {
+    Value |= 1 << 26;
+
+    unsigned Index = (Desc->TSFlags & ARMII::IndexModeMask);
+    if (Index == ARMII::IndexModePre || Index == 0)
+      Value |= 1 << 24;
+    if (Index == ARMII::IndexModePre)
+      Value |= 1 << 21;
+
+    unsigned Format = (Desc->TSFlags & ARMII::FormMask);
+    if (Format == ARMII::LdFrm)
+      Value |= 1 << 20;
+
+    unsigned BitByte = getBaseOpcodeFor(Desc);
+    Value |= BitByte << 22;
+
+    // set first operand
+    op = getMachineOpValue(MI,0);
+    Value |= op << 12;
+
+    // addressing mode
+    op = getMachineOpValue(MI,1);
+    Value |= op << 16;
+
+    const MachineOperand &MO2 = MI.getOperand(2);
+    const MachineOperand &MO3 = MI.getOperand(3);
+
+    Value |= (ARM_AM::getAM2Op(MO3.getImm()) == ARM_AM::add ? 1 : 0) << 23;
+    if (!MO2.getReg()) { // is immediate
+      if (ARM_AM::getAM2Offset(MO3.getImm()))
+        Value |= ARM_AM::getAM2Offset(MO3.getImm());
+      break;
+    }
+
+    Value |= 1 << 25;
+    assert(MRegisterInfo::isPhysicalRegister(MO2.getReg()));
+    Value |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
+
+    if (unsigned ShImm = ARM_AM::getAM2Offset(MO3.getImm())) {
+      unsigned ShiftOp = getShiftOp(MO3);
+      Value |= ShiftOp << 5;
+      Value |= ShImm << 7;
+    }
+
+    break;
+  }
+  case ARMII::AddrMode3: {
+    unsigned Index = (Desc->TSFlags & ARMII::IndexModeMask);
+    if (Index == ARMII::IndexModePre || Index == 0)
+      Value |= 1 << 24;
+
+    unsigned Format = (Desc->TSFlags & ARMII::FormMask);
+    if (Format == ARMII::LdFrm)
+      Value |= 1 << 20;
+
+    unsigned char BaseOpcode = getBaseOpcodeFor(Desc);
+    Value |= BaseOpcode << 4;
+
+    // set first operand
+    op = getMachineOpValue(MI,0);
+    Value |= op << 12;
+
+    // addressing mode
+    op = getMachineOpValue(MI,1);
+    Value |= op << 16;
+
+    const MachineOperand &MO2 = MI.getOperand(2);
+    const MachineOperand &MO3 = MI.getOperand(3);
+
+    Value |= (ARM_AM::getAM2Op(MO3.getImm()) == ARM_AM::add ? 1 : 0) << 23;
+
+    if (MO2.getReg()) {
+      Value |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
+      break;
+    }
+
+    if (unsigned ImmOffs = ARM_AM::getAM3Offset(MO3.getImm())) {
+      Value |= 1 << 22;
+      Value |= (ImmOffs >> 4) << 8; // immedH
+      Value |= (ImmOffs & ~0xF); // immedL
+    }
+
+    break;
+  }
+  case ARMII::AddrMode4: {
+    Value |= 1 << 27;
+
+    unsigned Format = (Desc->TSFlags & ARMII::FormMask);
+    if (Format == ARMII::LdFrm)
+      Value |= 1 << 20;
+
+    unsigned OpIndex = 0;
+
+    // set first operand
+    op = getMachineOpValue(MI,OpIndex);
+    Value |= op << 16;
+
+    // set addressing mode
+    const MachineOperand &MO = MI.getOperand(OpIndex + 1);
+    ARM_AM::AMSubMode Mode = ARM_AM::getAM4SubMode(MO.getImm());
+    switch(Mode) {
+    default: assert(0 && "Unknown addressing sub-mode!");
+    case ARM_AM::ia: Value |= 0x1 << 23; break;
+    case ARM_AM::ib: Value |= 0x2 << 23; break;
+    case ARM_AM::da: break;
+    case ARM_AM::db: Value |= 0x1 << 24; break;
+    }
+
+    // set flag W
+    if (ARM_AM::getAM4WBFlag(MO.getImm()))
+      Value |= 0x1 << 21;
+
+    // set registers
+    for (unsigned i = OpIndex + 4, e = MI.getNumOperands(); i != e; ++i) {
+      const MachineOperand &MOR = MI.getOperand(i);
+      unsigned RegNumber = ARMRegisterInfo::getRegisterNumbering(MOR.getReg());
+      assert(MRegisterInfo::isPhysicalRegister(MOR.getReg()) && RegNumber < 16);
+      Value |= 0x1 << RegNumber;
+    }
+
+    break;
+  }
+  }
+
+  return Value;
 }

lib/Target/ARM/ARMInstrInfo.h

@@ -34,6 +34,7 @@ namespace ARMII {
     // so that we can tell if we forgot to set a value.
 
     AddrModeMask  = 0xf,
+    AddrModeNone  = 0,
     AddrMode1     = 1,
     AddrMode2     = 2,
     AddrMode3     = 3,
@@ -61,7 +62,54 @@ namespace ARMII {
     
     // Opcode
     OpcodeShift   = 9,
-    OpcodeMask    = 0xf << OpcodeShift
+    OpcodeMask    = 0xf << OpcodeShift,
+    
+    // Format
+    FormShift   = 13,
+    FormMask    = 31 << FormShift,
+
+// Pseudo instructions
+    Pseudo      = 1 << FormShift,
+
+// Multiply instructions
+    MulFrm      = 2 << FormShift,
+
+// Branch instructions
+    Branch      = 3 << FormShift,
+    BranchMisc  = 4 << FormShift,
+
+// Data Processing instructions
+    DPRdIm      = 5 << FormShift,
+    DPRdReg     = 6 << FormShift,
+    DPRdSoReg   = 7 << FormShift,
+    DPRdMisc    = 8 << FormShift,
+
+    DPRnIm      = 9 << FormShift,
+    DPRnReg     = 10 << FormShift,
+    DPRnSoReg   = 11 << FormShift,
+
+    DPRIm       = 12 << FormShift,
+    DPRReg      = 13 << FormShift,
+    DPRSoReg    = 14 << FormShift,
+
+    DPRImS      = 15 << FormShift,
+    DPRRegS     = 16 << FormShift,
+    DPRSoRegS   = 17 << FormShift,
+
+// Load and Store
+    LdFrm       = 18 << FormShift,
+    StFrm       = 19 << FormShift,
+
+// Miscellaneous arithmetic instructions
+    ArithMisc   = 20 << FormShift,
+
+// Thumb format
+    ThumbFrm    = 21 << FormShift,
+
+// VFP format
+    VPFFrm      = 22 << FormShift
+    
+
   };
 }
 

lib/Target/ARM/ARMInstrThumb.td

@@ -32,7 +32,7 @@ class ThumbV5Pat<dag pattern, dag result> : Pat<pattern, result> {
 class ThumbI<dag outs, dag ins, AddrMode am, SizeFlagVal sz,
              string asm, string cstr, list<dag> pattern>
   // FIXME: Set all opcodes to 0 for now.
-  : InstARM<0, am, sz, IndexModeNone, cstr> {
+  : InstARM<0, am, sz, IndexModeNone, ThumbFrm, cstr> {
   let OutOperandList = outs;
   let InOperandList = ins;
   let AsmString   = asm;

lib/Target/ARM/ARMInstrVFP.td

@@ -17,44 +17,50 @@
 
 // ARM Float Instruction
 class ASI<dag outs, dag ins, string opc, string asm, list<dag> pattern>
-  : AI<outs, ins, opc, asm, pattern> {
+  : AI<0x0, outs, ins, VFPFrm, opc, asm, pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 
 class ASI5<dag outs, dag ins, string opc, string asm, list<dag> pattern>
-  : I<outs, ins, AddrMode5, Size4Bytes, IndexModeNone, opc, asm, "", pattern> {
+  : I<0x0, outs, ins, AddrMode5, Size4Bytes, IndexModeNone,
+      VFPFrm, opc, asm, "", pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 
 // ARM Double Instruction
 class ADI<dag outs, dag ins, string opc, string asm, list<dag> pattern>
-  : AI<outs, ins, opc, asm, pattern> {
+  : AI<0x0, outs, ins, VFPFrm, opc, asm, pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 
 class ADI5<dag outs, dag ins, string opc, string asm, list<dag> pattern>
-  : I<outs, ins, AddrMode5, Size4Bytes, IndexModeNone, opc, asm, "", pattern> {
+  : I<0x0, outs, ins, AddrMode5, Size4Bytes, IndexModeNone,
+      VFPFrm, opc, asm, "", pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 
 // Special cases.
 class AXSI<dag outs, dag ins, string asm, list<dag> pattern>
-  : XI<outs, ins, AddrModeNone, Size4Bytes, IndexModeNone, asm, "", pattern> {
+  : XI<0x0, outs, ins, AddrModeNone, Size4Bytes, IndexModeNone,
+       VFPFrm, asm, "", pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 
 class AXSI5<dag outs, dag ins, string asm, list<dag> pattern>
-  : XI<outs, ins, AddrMode5, Size4Bytes, IndexModeNone, asm, "", pattern> {
+  : XI<0x0, outs, ins, AddrMode5, Size4Bytes, IndexModeNone,
+       VFPFrm, asm, "", pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 
 class AXDI<dag outs, dag ins, string asm, list<dag> pattern>
-  : XI<outs, ins, AddrModeNone, Size4Bytes, IndexModeNone, asm, "", pattern> {
+  : XI<0x0, outs, ins, AddrModeNone, Size4Bytes, IndexModeNone,
+       VFPFrm, asm, "", pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 
 class AXDI5<dag outs, dag ins, string asm, list<dag> pattern>
-  : XI<outs, ins, AddrMode5, Size4Bytes, IndexModeNone, asm, "", pattern> {
+  : XI<0x0, outs, ins, AddrMode5, Size4Bytes, IndexModeNone,
+       VFPFrm, asm, "", pattern> {
   // TODO: Mark the instructions with the appropriate subtarget info.
 }
 

lib/Target/ARM/ARMJITInfo.cpp

@@ -127,5 +127,23 @@ void *ARMJITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) {
 /// referenced global symbols.
 void ARMJITInfo::relocate(void *Function, MachineRelocation *MR,
                           unsigned NumRelocs, unsigned char* GOTBase) {
-
+  for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
+    void *RelocPos = (char*)Function + MR->getMachineCodeOffset();
+    intptr_t ResultPtr = (intptr_t)MR->getResultPointer();
+    switch ((ARM::RelocationType)MR->getRelocationType()) {
+    case ARM::reloc_arm_relative: {
+      // PC relative relocation
+      *((unsigned*)RelocPos) += (unsigned)ResultPtr;
+      break;
+    }
+    case ARM::reloc_arm_absolute:
+      break;
+    case ARM::reloc_arm_branch: {
+      // relocation to b and bl instructions
+      ResultPtr = (ResultPtr-(intptr_t)RelocPos) >> 2;
+      *((unsigned*)RelocPos) |= ResultPtr;
+      break;
+    }
+    }
+  }
 }

lib/Target/ARM/ARMRelocations.h

@@ -19,7 +19,11 @@
 namespace llvm {
   namespace ARM {
     enum RelocationType {
+      reloc_arm_relative,
 
+      reloc_arm_absolute,
+
+      reloc_arm_branch
     };
   }
 }

lib/Target/ARM/ARMTargetMachine.cpp

@@ -37,7 +37,7 @@ namespace {
 /// ThumbTargetMachine - Create an Thumb architecture model.
 ///
 unsigned ThumbTargetMachine::getJITMatchQuality() {
-#if defined(__arm__)
+#if defined(__thumb__)
   return 10;
 #endif
   return 0;
@@ -87,7 +87,7 @@ ARMTargetMachine::ARMTargetMachine(const Module &M, const std::string &FS,
     TLInfo(*this) {}
 
 unsigned ARMTargetMachine::getJITMatchQuality() {
-#if defined(__thumb__)
+#if defined(__arm__)
   return 10;
 #endif
   return 0;