static DecodeStatus DecodeDaddiGroupBranch_4(MCInst *MI, uint32_t insn,
uint64_t Address, MCRegisterInfo *Decoder)
{
// If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled
// (otherwise we would have matched the ADDI instruction from the earlier
// ISA's instead).
//
// We have:
// 0b011000 sssss ttttt iiiiiiiiiiiiiiii
// BNVC if rs >= rt
// BNEZALC if rs == 0 && rt != 0
// BNEC if rs < rt && rs != 0
uint32_t Rs = fieldFromInstruction(insn, 21, 5);
uint32_t Rt = fieldFromInstruction(insn, 16, 5);
uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4;
bool HasRs = false;
if (Rs >= Rt) {
MCInst_setOpcode(MI, Mips_BNVC);
HasRs = true;
} else if (Rs != 0 && Rs < Rt) {
MCInst_setOpcode(MI, Mips_BNEC);
HasRs = true;
} else
MCInst_setOpcode(MI, Mips_BNEZALC);
if (HasRs)
MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs));
MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt));
MCOperand_CreateImm0(MI, Imm);
return MCDisassembler_Success;
}
static DecodeStatus DecodeINSVE_DF_4(MCInst *MI, uint32_t insn,
uint64_t Address, MCRegisterInfo *Decoder)
{
typedef DecodeStatus (*DecodeFN)(MCInst *, unsigned, uint64_t, MCRegisterInfo *);
// The size of the n field depends on the element size
// The register class also depends on this.
uint32_t tmp = fieldFromInstruction(insn, 17, 5);
unsigned NSize = 0;
DecodeFN RegDecoder = NULL;
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);
if (RegDecoder == NULL)
return MCDisassembler_Fail;
// $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);
MCOperand_CreateImm0(MI, tmp);
// $ws
tmp = fieldFromInstruction(insn, 11, 5);
if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler_Fail)
return MCDisassembler_Fail;
// $n2
MCOperand_CreateImm0(MI, 0);
return MCDisassembler_Success;
}
static DecodeStatus DecodeCachePref(MCInst *Inst,
unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder)
{
int Offset = SignExtend32(Insn & 0xffff, 16);
unsigned Hint = fieldFromInstruction(Insn, 16, 5);
unsigned Base = fieldFromInstruction(Insn, 21, 5);
Base = getReg(Decoder, Mips_GPR32RegClassID, Base);
MCOperand_CreateReg0(Inst, Base);
MCOperand_CreateImm0(Inst, Offset);
MCOperand_CreateImm0(Inst, Hint);
return MCDisassembler_Success;
}
static DecodeStatus DecodeJumpTargetMM(MCInst *Inst,
unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder)
{
unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 1;
MCInst_addOperand(Inst, MCOperand_CreateImm(JumpOffset));
return MCDisassembler_Success;
}
static DecodeStatus DecodeFMem(MCInst *Inst,
unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder)
{
int Offset = SignExtend32(Insn & 0xffff, 16);
unsigned Reg = fieldFromInstruction(Insn, 16, 5);
unsigned Base = fieldFromInstruction(Insn, 21, 5);
Reg = getReg(Decoder, Mips_FGR64RegClassID, Reg);
Base = getReg(Decoder, Mips_GPR32RegClassID, Base);
MCInst_addOperand(Inst, MCOperand_CreateReg(Reg));
MCInst_addOperand(Inst, MCOperand_CreateReg(Base));
MCInst_addOperand(Inst, MCOperand_CreateImm(Offset));
return MCDisassembler_Success;
}
static DecodeStatus DecodeMSA128Mem(MCInst *Inst, unsigned Insn,
uint64_t Address, MCRegisterInfo *Decoder)
{
int Offset = SignExtend32(fieldFromInstruction(Insn, 16, 10), 10);
unsigned Reg = fieldFromInstruction(Insn, 6, 5);
unsigned Base = fieldFromInstruction(Insn, 11, 5);
Reg = getReg(Decoder, Mips_MSA128BRegClassID, Reg);
Base = getReg(Decoder, Mips_GPR32RegClassID, Base);
MCInst_addOperand(Inst, MCOperand_CreateReg(Reg));
MCInst_addOperand(Inst, MCOperand_CreateReg(Base));
// MCInst_addOperand(Inst, 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(MCInst_getOpcode(Inst))
{
default:
//assert (0 && "Unexpected instruction");
return MCDisassembler_Fail;
break;
case Mips_LD_B:
case Mips_ST_B:
MCInst_addOperand(Inst, MCOperand_CreateImm(Offset));
break;
case Mips_LD_H:
case Mips_ST_H:
MCInst_addOperand(Inst, MCOperand_CreateImm(Offset << 1));
break;
case Mips_LD_W:
case Mips_ST_W:
MCInst_addOperand(Inst, MCOperand_CreateImm(Offset << 2));
break;
case Mips_LD_D:
case Mips_ST_D:
MCInst_addOperand(Inst, MCOperand_CreateImm(Offset << 3));
break;
}
return MCDisassembler_Success;
}
static DecodeStatus DecodeMemMMImm12(MCInst *Inst,
unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder)
{
int Offset = SignExtend32(Insn & 0x0fff, 12);
unsigned Reg = fieldFromInstruction(Insn, 21, 5);
unsigned Base = fieldFromInstruction(Insn, 16, 5);
Reg = getReg(Decoder, Mips_GPR32RegClassID, Reg);
Base = getReg(Decoder, Mips_GPR32RegClassID, Base);
if (MCInst_getOpcode(Inst) == Mips_SC_MM)
MCOperand_CreateReg0(Inst, Reg);
MCOperand_CreateReg0(Inst, Reg);
MCOperand_CreateReg0(Inst, Base);
MCOperand_CreateImm0(Inst, Offset);
return MCDisassembler_Success;
}
static DecodeStatus DecodeBgtzlGroupBranch_4(MCInst *MI, uint32_t insn,
uint64_t Address, MCRegisterInfo *Decoder)
{
// If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled
// (otherwise we would have matched the BGTZL instruction from the earlier
// ISA's instead).
//
// We have:
// 0b010111 sssss ttttt iiiiiiiiiiiiiiii
// Invalid if rs == 0
// BGTZC if rs == 0 && rt != 0
// BLTZC if rs == rt && rt != 0
// BLTC if rs != rt && rs != 0 && rt != 0
bool HasRs = false;
uint32_t Rs = fieldFromInstruction(insn, 21, 5);
uint32_t Rt = fieldFromInstruction(insn, 16, 5);
uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4;
if (Rt == 0)
return MCDisassembler_Fail;
else if (Rs == 0)
MCInst_setOpcode(MI, Mips_BGTZC);
else if (Rs == Rt)
MCInst_setOpcode(MI, Mips_BLTZC);
else {
MCInst_setOpcode(MI, Mips_BLTC);
HasRs = true;
}
if (HasRs)
MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs));
MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt));
MCOperand_CreateImm0(MI, Imm);
return MCDisassembler_Success;
}
Reg = getReg(Decoder, Mips_COP3RegClassID, Reg);
Base = getReg(Decoder, Mips_GPR32RegClassID, Base);
MCOperand_CreateReg0(Inst, Reg);
MCOperand_CreateReg0(Inst, Base);
MCOperand_CreateImm0(Inst, Offset);
return MCDisassembler_Success;
}
static DecodeStatus DecodeSpecial3LlSc(MCInst *Inst,
unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder)
{
int64_t Offset = SignExtend64((Insn >> 7) & 0x1ff, 9);
unsigned Rt = fieldFromInstruction(Insn, 16, 5);
unsigned Base = fieldFromInstruction(Insn, 21, 5);
Rt = getReg(Decoder, Mips_GPR32RegClassID, Rt);
Base = getReg(Decoder, Mips_GPR32RegClassID, Base);
if (MCInst_getOpcode(Inst) == Mips_SC_R6 ||
MCInst_getOpcode(Inst) == Mips_SCD_R6) {
MCOperand_CreateReg0(Inst, Rt);
}
MCOperand_CreateReg0(Inst, Rt);
MCOperand_CreateReg0(Inst, Base);
MCOperand_CreateImm0(Inst, Offset);
return MCDisassembler_Success;