[mips] Rewrite MipsAsmParser and MipsOperand.

[oota-llvm.git] / lib / Target / Mips / Disassembler / MipsDisassembler.cpp

diff --git a/lib/Target/Mips/Disassembler/MipsDisassembler.cpp b/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
index 37ea3827f8843aab667ca821407cc14d8761581f..fc3b922602c20d9b576f16164b2ef41987248e43 100644 (file)
--- a/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
+++ b/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
@@ -205,6 +205,20 @@ static DecodeStatus DecodeJumpTarget(MCInst &Inst,
                                      uint64_t Address,
                                      const void *Decoder);
 
+// DecodeBranchTargetMM - Decode microMIPS branch offset, which is
+// shifted left by 1 bit.
+static DecodeStatus DecodeBranchTargetMM(MCInst &Inst,
+                                         unsigned Offset,
+                                         uint64_t Address,
+                                         const void *Decoder);
+
+// DecodeJumpTargetMM - Decode microMIPS jump target, which is
+// shifted left by 1 bit.
+static DecodeStatus DecodeJumpTargetMM(MCInst &Inst,
+                                       unsigned Insn,
+                                       uint64_t Address,
+                                       const void *Decoder);
+
 static DecodeStatus DecodeMem(MCInst &Inst,
                               unsigned Insn,
                               uint64_t Address,
@@ -232,6 +246,13 @@ static DecodeStatus DecodeSimm16(MCInst &Inst,
                                  uint64_t Address,
                                  const void *Decoder);
 
+// Decode the immediate field of an LSA instruction which
+// is off by one.
+static DecodeStatus DecodeLSAImm(MCInst &Inst,
+                                 unsigned Insn,
+                                 uint64_t Address,
+                                 const void *Decoder);
+
 static DecodeStatus DecodeInsSize(MCInst &Inst,
                                   unsigned Insn,
                                   uint64_t Address,
@@ -242,6 +263,11 @@ static DecodeStatus DecodeExtSize(MCInst &Inst,
                                   uint64_t Address,
                                   const void *Decoder);
 
+/// INSVE_[BHWD] have an implicit operand that the generated decoder doesn't
+/// handle.
+template <typename InsnType>
+static DecodeStatus DecodeINSVE_DF(MCInst &MI, InsnType insn, uint64_t Address,
+                                   const void *Decoder);
 namespace llvm {
 extern Target TheMipselTarget, TheMipsTarget, TheMips64Target,
               TheMips64elTarget;
@@ -283,9 +309,54 @@ extern "C" void LLVMInitializeMipsDisassembler() {
                                          createMips64elDisassembler);
 }
 
-
 #include "MipsGenDisassemblerTables.inc"
 
+template <typename InsnType>
+static DecodeStatus DecodeINSVE_DF(MCInst &MI, InsnType insn, uint64_t Address,
+                                   const void *Decoder) {
+  typedef DecodeStatus (*DecodeFN)(MCInst &, unsigned, uint64_t, const void *);
+  // The size of the n field depends on the element size
+  // The register class also depends on this.
+  InsnType tmp = fieldFromInstruction(insn, 17, 5);
+  unsigned NSize = 0;
+  DecodeFN RegDecoder = nullptr;
+  if ((tmp & 0x18) == 0x00) { // INSVE_B
+    NSize = 4;
+    RegDecoder = DecodeMSA128BRegisterClass;
+  } else if ((tmp & 0x1c) == 0x10) { // INSVE_H
+    NSize = 3;
+    RegDecoder = DecodeMSA128HRegisterClass;
+  } else if ((tmp & 0x1e) == 0x18) { // INSVE_W
+    NSize = 2;
+    RegDecoder = DecodeMSA128WRegisterClass;
+  } else if ((tmp & 0x1f) == 0x1c) { // INSVE_D
+    NSize = 1;
+    RegDecoder = DecodeMSA128DRegisterClass;
+  } else
+    llvm_unreachable("Invalid encoding");
+
+  assert(NSize != 0 && RegDecoder != nullptr);
+
+  // $wd
+  tmp = fieldFromInstruction(insn, 6, 5);
+  if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail)
+    return MCDisassembler::Fail;
+  // $wd_in
+  if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail)
+    return MCDisassembler::Fail;
+  // $n
+  tmp = fieldFromInstruction(insn, 16, NSize);
+  MI.addOperand(MCOperand::CreateImm(tmp));
+  // $ws
+  tmp = fieldFromInstruction(insn, 11, 5);
+  if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail)
+    return MCDisassembler::Fail;
+  // $n2
+  MI.addOperand(MCOperand::CreateImm(0));
+
+  return MCDisassembler::Success;
+}
+
   /// readInstruction - read four bytes from the MemoryObject
   /// and return 32 bit word sorted according to the given endianess
 static DecodeStatus readInstruction32(const MemoryObject &region,
@@ -544,7 +615,37 @@ static DecodeStatus DecodeMSA128Mem(MCInst &Inst, unsigned Insn,
 
   Inst.addOperand(MCOperand::CreateReg(Reg));
   Inst.addOperand(MCOperand::CreateReg(Base));
-  Inst.addOperand(MCOperand::CreateImm(Offset));
+
+  // The immediate field of an LD/ST instruction is scaled which means it must
+  // be multiplied (when decoding) by the size (in bytes) of the instructions'
+  // data format.
+  // .b - 1 byte
+  // .h - 2 bytes
+  // .w - 4 bytes
+  // .d - 8 bytes
+  switch(Inst.getOpcode())
+  {
+  default:
+    assert (0 && "Unexpected instruction");
+    return MCDisassembler::Fail;
+    break;
+  case Mips::LD_B:
+  case Mips::ST_B:
+    Inst.addOperand(MCOperand::CreateImm(Offset));
+    break;
+  case Mips::LD_H:
+  case Mips::ST_H:
+    Inst.addOperand(MCOperand::CreateImm(Offset << 1));
+    break;
+  case Mips::LD_W:
+  case Mips::ST_W:
+    Inst.addOperand(MCOperand::CreateImm(Offset << 2));
+    break;
+  case Mips::LD_D:
+  case Mips::ST_D:
+    Inst.addOperand(MCOperand::CreateImm(Offset << 3));
+    break;
+  }
 
   return MCDisassembler::Success;
 }
@@ -560,6 +661,9 @@ static DecodeStatus DecodeMemMMImm12(MCInst &Inst,
   Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg);
   Base = getReg(Decoder, Mips::GPR32RegClassID, Base);
 
+  if (Inst.getOpcode() == Mips::SC_MM)
+    Inst.addOperand(MCOperand::CreateReg(Reg));
+
   Inst.addOperand(MCOperand::CreateReg(Reg));
   Inst.addOperand(MCOperand::CreateReg(Base));
   Inst.addOperand(MCOperand::CreateImm(Offset));
@@ -744,6 +848,24 @@ static DecodeStatus DecodeJumpTarget(MCInst &Inst,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeBranchTargetMM(MCInst &Inst,
+                                         unsigned Offset,
+                                         uint64_t Address,
+                                         const void *Decoder) {
+  unsigned BranchOffset = Offset & 0xffff;
+  BranchOffset = SignExtend32<18>(BranchOffset << 1);
+  Inst.addOperand(MCOperand::CreateImm(BranchOffset));
+  return MCDisassembler::Success;
+}
+
+static DecodeStatus DecodeJumpTargetMM(MCInst &Inst,
+                                       unsigned Insn,
+                                       uint64_t Address,
+                                       const void *Decoder) {
+  unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 1;
+  Inst.addOperand(MCOperand::CreateImm(JumpOffset));
+  return MCDisassembler::Success;
+}
 
 static DecodeStatus DecodeSimm16(MCInst &Inst,
                                  unsigned Insn,
@@ -753,6 +875,15 @@ static DecodeStatus DecodeSimm16(MCInst &Inst,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeLSAImm(MCInst &Inst,
+                                 unsigned Insn,
+                                 uint64_t Address,
+                                 const void *Decoder) {
+  // We add one to the immediate field as it was encoded as 'imm - 1'.
+  Inst.addOperand(MCOperand::CreateImm(Insn + 1));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeInsSize(MCInst &Inst,
                                   unsigned Insn,
                                   uint64_t Address,