private void Inst_Lhu(MipsInstruction inst)
{
try
{
Int64 address = ComputeAddress(inst);
if ((address & 1) != 0)
{
CauseException = ExceptionCode.AddressErrorLoad;
return;
}
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rt, DataManipulator.LoadHalfwordUnsigned(address));
}
else
{
MipsState.WriteGPRUnsigned(inst.Rt, DataManipulator.LoadHalfwordUnsigned(address));
}
}
catch (TLBException tlbe)
{
switch (tlbe.ExceptionType)
{
case TLBExceptionType.Invalid: CauseException = ExceptionCode.Invalid; break;
case TLBExceptionType.Mod: CauseException = ExceptionCode.TlbMod; break;
case TLBExceptionType.Refill: CauseException = ExceptionCode.TlbStore; break;
default: break;
}
}
}
private void Inst_Subu(MipsInstruction inst)
{
unchecked
{
MipsState.WriteGPR32Unsigned(inst.Rd, MipsState.ReadGPR32Unsigned(inst.Rs) - MipsState.ReadGPR32Unsigned(inst.Rt));
}
}
private void Inst_Xor(MipsInstruction inst)
{
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rd, MipsState.ReadGPR32Unsigned(inst.Rs) ^ MipsState.ReadGPR32Unsigned(inst.Rt));
}
else
{
MipsState.WriteGPRUnsigned(inst.Rd, MipsState.ReadGPRUnsigned(inst.Rs) ^ MipsState.ReadGPRUnsigned(inst.Rt));
}
}
private void Inst_Andi(MipsInstruction inst)
{
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rt, MipsState.ReadGPR32Unsigned(inst.Rs) & (UInt32)inst.Immediate);
}
else
{
MipsState.WriteGPRUnsigned(inst.Rt, MipsState.ReadGPRUnsigned(inst.Rs) & (UInt64)inst.Immediate);
}
}
private void Inst_Srvl(MipsInstruction inst)
{
UInt32 result = MipsState.ReadGPR32Unsigned(inst.Rt) >> MipsState.ReadGPR32Signed(inst.Rs) & 0x1F;
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rd, result);
}
else
{
MipsState.WriteGPRUnsigned(inst.Rd, (UInt32)(Int32)result);
}
}
private void Inst_Srl(MipsInstruction inst)
{
UInt32 result = MipsState.ReadGPR32Unsigned(inst.Rt) >> inst.ShiftAmount;
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rd, result);
}
else
{
MipsState.WriteGPRUnsigned(inst.Rd, (UInt64)(Int64)(Int16)result);
}
}
private void Inst_Sltiu(MipsInstruction inst)
{
if (!MipsState.Operating64BitMode)
{
Boolean condition = MipsState.ReadGPR32Unsigned(inst.Rs) < ((UInt32)(Int32)(Int16)inst.Immediate);
MipsState.WriteGPR32Unsigned(inst.Rt, condition ? 1U : 0U);
}
else
{
Boolean condition = MipsState.ReadGPRUnsigned(inst.Rs) < ((UInt64)(Int64)(Int16)inst.Immediate);
MipsState.WriteGPRUnsigned(inst.Rt, condition ? 1UL : 0UL);
}
}
private void Inst_Lui(MipsInstruction inst)
{
UInt32 word = ((UInt32)inst.Immediate) << 16;
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rt, word);
}
else
{
MipsState.WriteGPRUnsigned(inst.Rt, (UInt64)(Int64)(Int32)word);
}
}
private void Inst_Addiu(MipsInstruction inst)
{
unchecked
{
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rt, MipsState.ReadGPR32Unsigned(inst.Rs) + (UInt32)(Int32)(Int16)inst.Immediate);
}
else
{
if (MipsState.ReadGPRUnsigned(inst.Rs).IsSigned32())
{
MipsState.WriteGPRUnsigned(inst.Rt, MipsState.ReadGPRUnsigned(inst.Rs) + (UInt64)(Int64)(Int16)inst.Immediate);
}
}
}
}
private void Inst_Addu(MipsInstruction inst)
{
unchecked
{
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rd, MipsState.ReadGPR32Unsigned(inst.Rs) + MipsState.ReadGPR32Unsigned(inst.Rt));
}
else
{
if (MipsState.ReadGPRUnsigned(inst.Rs).IsSigned32() && MipsState.ReadGPRUnsigned(inst.Rt).IsSigned32())
{
MipsState.WriteGPRUnsigned(inst.Rd, MipsState.ReadGPRUnsigned(inst.Rs) + MipsState.ReadGPRUnsigned(inst.Rt));
}
}
}
}
private void Inst_Mfc1(MipsInstruction inst)
{
if (!CheckCop1Usable())
{
CauseException = ExceptionCode.CopUnstable;
return;
}
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rt, MipsState.Fpr.ReadFPR32Unsigned(inst.Fs));
}
else
{
MipsState.WriteGPRUnsigned(inst.Rt, MipsState.Fpr.ReadFPR32Unsigned(inst.Fs));
}
}
private void Inst_Sllv(MipsInstruction inst)
{
Int32 shiftAmount = MipsState.ReadGPR32Signed(inst.Rs) & 0x1F;
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rd, MipsState.ReadGPR32Unsigned(inst.Rt) << shiftAmount);
}
else
{
UInt64 result = MipsState.ReadGPRUnsigned(inst.Rt) << shiftAmount;
/* Truncate */
if (shiftAmount == 0)
{
MipsState.WriteGPRSigned(inst.Rd, (Int32)(UInt32)result);
}
else
{
MipsState.WriteGPRUnsigned(inst.Rd, result);
}
}
}
private void Inst_Mfc0(MipsInstruction inst)
{
if (MipsState.CP0Regs.StatusReg.CopUsable0)
{
if (!MipsState.Operating64BitMode)
{
MipsState.WriteGPR32Unsigned(inst.Rt, (UInt32)MipsState.CP0Regs[inst.Rd]);
/* Count register */
if (inst.Rt == 9)
{
MupenHelper.UpdateCount();
}
}
else
{
MipsState.WriteGPRUnsigned(inst.Rt, MipsState.CP0Regs[inst.Rd]);
}
}
else
{
CauseException = ExceptionCode.CopUnstable;
}
}