X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FPowerPC%2FDisassembler%2FPPCDisassembler.cpp;h=93a503c3758d5c21e01256336db71001637d3938;hb=17351cfb43e320129b854fff774cd81a6154fcb9;hp=5b6e6b25b99d4f1562c3e9ec94e88c39c5c864cc;hpb=1336daad86de3d09d8a2319be3b12f91d4632563;p=oota-llvm.git

diff --git a/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp b/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp
index 5b6e6b25b99..93a503c3758 100644
--- a/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp
+++ b/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp
@@ -12,6 +12,7 @@
 #include "llvm/MC/MCFixedLenDisassembler.h"
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/Endian.h"
 #include "llvm/Support/TargetRegistry.h"
 
 using namespace llvm;
@@ -22,10 +23,12 @@ typedef MCDisassembler::DecodeStatus DecodeStatus;
 
 namespace {
 class PPCDisassembler : public MCDisassembler {
+  bool IsLittleEndian;
+
 public:
-  PPCDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx)
-    : MCDisassembler(STI, Ctx) {}
-  ~PPCDisassembler() override {}
+  PPCDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx,
+                  bool IsLittleEndian)
+      : MCDisassembler(STI, Ctx), IsLittleEndian(IsLittleEndian) {}
 
   DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
                               ArrayRef<uint8_t> Bytes, uint64_t Address,
@@ -37,7 +40,13 @@ public:
 static MCDisassembler *createPPCDisassembler(const Target &T,
                                              const MCSubtargetInfo &STI,
                                              MCContext &Ctx) {
-  return new PPCDisassembler(STI, Ctx);
+  return new PPCDisassembler(STI, Ctx, /*IsLittleEndian=*/false);
+}
+
+static MCDisassembler *createPPCLEDisassembler(const Target &T,
+                                               const MCSubtargetInfo &STI,
+                                               MCContext &Ctx) {
+  return new PPCDisassembler(STI, Ctx, /*IsLittleEndian=*/true);
 }
 
 extern "C" void LLVMInitializePowerPCDisassembler() {
@@ -47,7 +56,7 @@ extern "C" void LLVMInitializePowerPCDisassembler() {
   TargetRegistry::RegisterMCDisassembler(ThePPC64Target,
                                          createPPCDisassembler);
   TargetRegistry::RegisterMCDisassembler(ThePPC64LETarget,
-                                         createPPCDisassembler);
+                                         createPPCLEDisassembler);
 }
 
 // FIXME: These can be generated by TableGen from the existing register
@@ -199,7 +208,7 @@ template <std::size_t N>
 static DecodeStatus decodeRegisterClass(MCInst &Inst, uint64_t RegNo,
                                         const unsigned (&Regs)[N]) {
   assert(RegNo < N && "Invalid register number");
-  Inst.addOperand(MCOperand::CreateReg(Regs[RegNo]));
+  Inst.addOperand(MCOperand::createReg(Regs[RegNo]));
   return MCDisassembler::Success;
 }
 
@@ -291,7 +300,7 @@ template<unsigned N>
 static DecodeStatus decodeUImmOperand(MCInst &Inst, uint64_t Imm,
                                       int64_t Address, const void *Decoder) {
   assert(isUInt<N>(Imm) && "Invalid immediate");
-  Inst.addOperand(MCOperand::CreateImm(Imm));
+  Inst.addOperand(MCOperand::createImm(Imm));
   return MCDisassembler::Success;
 }
 
@@ -299,7 +308,7 @@ template<unsigned N>
 static DecodeStatus decodeSImmOperand(MCInst &Inst, uint64_t Imm,
                                       int64_t Address, const void *Decoder) {
   assert(isUInt<N>(Imm) && "Invalid immediate");
-  Inst.addOperand(MCOperand::CreateImm(SignExtend64<N>(Imm)));
+  Inst.addOperand(MCOperand::createImm(SignExtend64<N>(Imm)));
   return MCDisassembler::Success;
 }
 
@@ -322,19 +331,19 @@ static DecodeStatus decodeMemRIOperands(MCInst &Inst, uint64_t Imm,
   case PPC::LFSU:
   case PPC::LFDU:
     // Add the tied output operand.
-    Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
+    Inst.addOperand(MCOperand::createReg(GP0Regs[Base]));
     break;
   case PPC::STBU:
   case PPC::STHU:
   case PPC::STWU:
   case PPC::STFSU:
   case PPC::STFDU:
-    Inst.insert(Inst.begin(), MCOperand::CreateReg(GP0Regs[Base]));
+    Inst.insert(Inst.begin(), MCOperand::createReg(GP0Regs[Base]));
     break;
   }
 
-  Inst.addOperand(MCOperand::CreateImm(SignExtend64<16>(Disp)));
-  Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
+  Inst.addOperand(MCOperand::createImm(SignExtend64<16>(Disp)));
+  Inst.addOperand(MCOperand::createReg(GP0Regs[Base]));
   return MCDisassembler::Success;
 }
 
@@ -350,12 +359,12 @@ static DecodeStatus decodeMemRIXOperands(MCInst &Inst, uint64_t Imm,
 
   if (Inst.getOpcode() == PPC::LDU)
     // Add the tied output operand.
-    Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
+    Inst.addOperand(MCOperand::createReg(GP0Regs[Base]));
   else if (Inst.getOpcode() == PPC::STDU)
-    Inst.insert(Inst.begin(), MCOperand::CreateReg(GP0Regs[Base]));
+    Inst.insert(Inst.begin(), MCOperand::createReg(GP0Regs[Base]));
 
-  Inst.addOperand(MCOperand::CreateImm(SignExtend64<16>(Disp << 2)));
-  Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
+  Inst.addOperand(MCOperand::createImm(SignExtend64<16>(Disp << 2)));
+  Inst.addOperand(MCOperand::createReg(GP0Regs[Base]));
   return MCDisassembler::Success;
 }
 
@@ -366,7 +375,7 @@ static DecodeStatus decodeCRBitMOperand(MCInst &Inst, uint64_t Imm,
   unsigned Zeros = countTrailingZeros(Imm);
   assert(Zeros < 8 && "Invalid CR bit value");
 
-  Inst.addOperand(MCOperand::CreateReg(CRRegs[7 - Zeros]));
+  Inst.addOperand(MCOperand::createReg(CRRegs[7 - Zeros]));
   return MCDisassembler::Success;
 }
 
@@ -383,9 +392,9 @@ DecodeStatus PPCDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
     return MCDisassembler::Fail;
   }
 
-  // The instruction is big-endian encoded.
-  uint32_t Inst =
-      (Bytes[0] << 24) | (Bytes[1] << 16) | (Bytes[2] << 8) | (Bytes[3] << 0);
+  // Read the instruction in the proper endianness.
+  uint32_t Inst = IsLittleEndian ? support::endian::read32le(Bytes.data())
+                                 : support::endian::read32be(Bytes.data());
 
   if (STI.getFeatureBits()[PPC::FeatureQPX]) {
     DecodeStatus result =