private void Inst_FpuAdd(MipsInstruction inst)
{
unchecked
{
if (!CheckCop1Usable())
{
CauseException = ExceptionCode.CopUnstable;
return;
}
if (!CheckEvenOddAllowed(inst))
{
return;
}
DataFormat format = inst.DecodeDataFormat();
if (format == DataFormat.Single || format == DataFormat.Double)
{
FPUHardware.SetRoundingMode(MipsState.FCR31.RM);
FPUEntity left = new FPUEntity(format, MipsState);
FPUEntity right = new FPUEntity(format, MipsState);
FPUEntity result = new FPUEntity(format, MipsState);
left.Load(inst.Fs);
right.Load(inst.Ft);
try
{
result.Value = left + right;
result.Store(inst.Fd);
}
catch (OverflowException)
{
if (FPUHardware.CheckFPUException())
{
CauseFPUException(FPUHardware.GetFPUException());
}
}
}
else
{
CauseFPUException(FPUExceptionType.Unimplemented);
}
}
}
private void SetInitialState()
{
if (m_ExecEngine == null)
{
throw new InvalidOperationException("Execution engine cannot be null");
}
/* MIPS Registers */
m_State.GPRRegs.Clear();
m_State.LLBit = false;
m_State.Hi = 0;
m_State.Lo = 0;
/* Setup Cop0 Registers */
m_State.CP0Regs.Cause = 0x5C;
m_State.CP0Regs.Status = 0x34000000;
m_State.CP0Regs.Config = 0x0006E463;
m_State.CP0Regs.PRId = 0xB00;
m_State.CP0Regs.Count = 0x5000;
m_State.CP0Regs.Context = 0x7FFFF0;
m_State.CP0Regs.ErrorEPC = 0xFFFFFFFF;
m_State.CP0Regs.EPC = 0xFFFFFFFF;
/* Setup Cop1 Registers */
m_State.FCR0 = 0x511;
m_State.FCR31.RegisterValue = 0;
m_State.Fpr.Clear();
FPUHardware.SetRoundingMode(m_State.FCR31.RM);
/* Initialize the execution engine */
m_ExecEngine.SetParent(this);
/* Initialize the MMU */
m_MMU.Initialize();
/* Initialize the engine */
m_ExecEngine.Initialize();
}
private void Inst_FpuRoundW(MipsInstruction inst)
{
unchecked
{
if (!CheckCop1Usable())
{
CauseException = ExceptionCode.CopUnstable;
return;
}
if (!CheckEvenOddAllowed(inst))
{
return;
}
DataFormat format = inst.DecodeDataFormat();
if (format == DataFormat.Single || format == DataFormat.Double)
{
FPUHardware.SetRoundingMode(FPURoundMode.Near);
FPUEntity value = new FPUEntity(format, MipsState);
FPUEntity result = new FPUEntity(DataFormat.Word, MipsState);
value.Load(inst.Fs);
result.Value = (UInt32)Math.Round(value.Value, MidpointRounding.ToEven);
result.Store(inst.Fd);
if (FPUHardware.CheckFPUException())
{
CauseFPUException(FPUHardware.GetFPUException());
}
}
else
{
CauseFPUException(FPUExceptionType.Unimplemented);
}
}
}
private void Inst_FpuSqrt(MipsInstruction inst)
{
if (!CheckCop1Usable())
{
CauseException = ExceptionCode.CopUnstable;
return;
}
if (!CheckEvenOddAllowed(inst))
{
return;
}
unchecked
{
DataFormat format = inst.DecodeDataFormat();
if (format == DataFormat.Single || format == DataFormat.Double)
{
FPUEntity value = new FPUEntity(format, MipsState);
value.Load(inst.Fs);
FPUHardware.SetRoundingMode(MipsState.FCR31.RM);
value.Value = Math.Sqrt(value.Value);
value.Store(inst.Fd);
if (FPUHardware.CheckFPUException())
{
CauseFPUException(FPUHardware.GetFPUException());
}
}
else
{
CauseFPUException(FPUExceptionType.Unimplemented);
}
}
}
private void Inst_FpuConvertW(MipsInstruction inst)
{
unchecked
{
if (!CheckCop1Usable())
{
CauseException = ExceptionCode.CopUnstable;
return;
}
if (!CheckEvenOddAllowed(inst))
{
return;
}
DataFormat format = inst.DecodeDataFormat();
if (format != DataFormat.Reserved || format != DataFormat.Word)
{
FPUEntity value = new FPUEntity(format, MipsState);
FPUEntity result = new FPUEntity(DataFormat.Word, MipsState);
value.Load(inst.Fs);
result.Value = Convert.ToUInt32(value.Value);
value.Store(inst.Fd);
if (FPUHardware.CheckFPUException())
{
CauseFPUException(FPUHardware.GetFPUException());
}
}
else
{
CauseFPUException(FPUExceptionType.Unimplemented);
}
}
}
