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using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.State;
using ARMeilleure.Translation;
using System;
using System.Reflection;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
namespace ARMeilleure.Instructions
{
static partial class InstEmit32
{
public static void Mcr(ArmEmitterContext context)
{
OpCode32System op = (OpCode32System)context.CurrOp;
if (op.Coproc != 15 || op.Opc1 != 0)
{
InstEmit.Und(context);
return;
}
switch (op.CRn)
{
case 13: // Process and Thread Info.
if (op.CRm != 0)
{
throw new NotImplementedException($"Unknown MRC CRm 0x{op.CRm:X} at 0x{op.Address:X} (0x{op.RawOpCode:X}).");
}
switch (op.Opc2)
{
case 2:
EmitSetTpidrEl0(context);
return;
default:
throw new NotImplementedException($"Unknown MRC Opc2 0x{op.Opc2:X} at 0x{op.Address:X} (0x{op.RawOpCode:X}).");
}
case 7:
switch (op.CRm) // Cache and Memory barrier.
{
case 10:
switch (op.Opc2)
{
case 5: // Data Memory Barrier Register.
return; // No-op.
default:
throw new NotImplementedException($"Unknown MRC Opc2 0x{op.Opc2:X16} at 0x{op.Address:X16} (0x{op.RawOpCode:X}).");
}
default:
throw new NotImplementedException($"Unknown MRC CRm 0x{op.CRm:X16} at 0x{op.Address:X16} (0x{op.RawOpCode:X}).");
}
default:
throw new NotImplementedException($"Unknown MRC 0x{op.RawOpCode:X8} at 0x{op.Address:X16}.");
}
}
public static void Mrc(ArmEmitterContext context)
{
OpCode32System op = (OpCode32System)context.CurrOp;
if (op.Coproc != 15 || op.Opc1 != 0)
{
InstEmit.Und(context);
return;
}
Operand result;
switch (op.CRn)
{
case 13: // Process and Thread Info.
if (op.CRm != 0)
{
throw new NotImplementedException($"Unknown MRC CRm 0x{op.CRm:X} at 0x{op.Address:X} (0x{op.RawOpCode:X}).");
}
result = op.Opc2 switch
{
2 => EmitGetTpidrEl0(context),
3 => EmitGetTpidrroEl0(context),
_ => throw new NotImplementedException(
$"Unknown MRC Opc2 0x{op.Opc2:X} at 0x{op.Address:X} (0x{op.RawOpCode:X})."),
};
break;
default:
throw new NotImplementedException($"Unknown MRC 0x{op.RawOpCode:X} at 0x{op.Address:X}.");
}
if (op.Rt == RegisterAlias.Aarch32Pc)
{
// Special behavior: copy NZCV flags into APSR.
EmitSetNzcv(context, result);
return;
}
else
{
SetIntA32(context, op.Rt, result);
}
}
public static void Mrrc(ArmEmitterContext context)
{
OpCode32System op = (OpCode32System)context.CurrOp;
if (op.Coproc != 15)
{
InstEmit.Und(context);
return;
}
int opc = op.MrrcOp;
MethodInfo info = op.CRm switch
{
// Timer.
14 => opc switch
{
0 => typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetCntpctEl0)),
_ => throw new NotImplementedException($"Unknown MRRC Opc1 0x{opc:X} at 0x{op.Address:X} (0x{op.RawOpCode:X})."),
},
_ => throw new NotImplementedException($"Unknown MRRC 0x{op.RawOpCode:X} at 0x{op.Address:X}."),
};
Operand result = context.Call(info);
SetIntA32(context, op.Rt, context.ConvertI64ToI32(result));
SetIntA32(context, op.CRn, context.ConvertI64ToI32(context.ShiftRightUI(result, Const(32))));
}
public static void Mrs(ArmEmitterContext context)
{
OpCode32Mrs op = (OpCode32Mrs)context.CurrOp;
if (op.R)
{
throw new NotImplementedException("SPSR");
}
else
{
Operand spsr = context.ShiftLeft(GetFlag(PState.VFlag), Const((int)PState.VFlag));
spsr = context.BitwiseOr(spsr, context.ShiftLeft(GetFlag(PState.CFlag), Const((int)PState.CFlag)));
spsr = context.BitwiseOr(spsr, context.ShiftLeft(GetFlag(PState.ZFlag), Const((int)PState.ZFlag)));
spsr = context.BitwiseOr(spsr, context.ShiftLeft(GetFlag(PState.NFlag), Const((int)PState.NFlag)));
spsr = context.BitwiseOr(spsr, context.ShiftLeft(GetFlag(PState.QFlag), Const((int)PState.QFlag)));
// TODO: Remaining flags.
SetIntA32(context, op.Rd, spsr);
}
}
public static void Msr(ArmEmitterContext context)
{
OpCode32MsrReg op = (OpCode32MsrReg)context.CurrOp;
if (op.R)
{
throw new NotImplementedException("SPSR");
}
else
{
if ((op.Mask & 8) != 0)
{
Operand value = GetIntA32(context, op.Rn);
EmitSetNzcv(context, value);
Operand q = context.BitwiseAnd(context.ShiftRightUI(value, Const((int)PState.QFlag)), Const(1));
SetFlag(context, PState.QFlag, q);
}
if ((op.Mask & 4) != 0)
{
throw new NotImplementedException("APSR_g");
}
if ((op.Mask & 2) != 0)
{
throw new NotImplementedException("CPSR_x");
}
if ((op.Mask & 1) != 0)
{
throw new NotImplementedException("CPSR_c");
}
}
}
public static void Nop(ArmEmitterContext context) { }
public static void Vmrs(ArmEmitterContext context)
{
OpCode32SimdSpecial op = (OpCode32SimdSpecial)context.CurrOp;
if (op.Rt == RegisterAlias.Aarch32Pc && op.Sreg == 0b0001)
{
// Special behavior: copy NZCV flags into APSR.
SetFlag(context, PState.VFlag, GetFpFlag(FPState.VFlag));
SetFlag(context, PState.CFlag, GetFpFlag(FPState.CFlag));
SetFlag(context, PState.ZFlag, GetFpFlag(FPState.ZFlag));
SetFlag(context, PState.NFlag, GetFpFlag(FPState.NFlag));
return;
}
switch (op.Sreg)
{
case 0b0000: // FPSID
throw new NotImplementedException("Supervisor Only");
case 0b0001: // FPSCR
EmitGetFpscr(context);
return;
case 0b0101: // MVFR2
throw new NotImplementedException("MVFR2");
case 0b0110: // MVFR1
throw new NotImplementedException("MVFR1");
case 0b0111: // MVFR0
throw new NotImplementedException("MVFR0");
case 0b1000: // FPEXC
throw new NotImplementedException("Supervisor Only");
default:
throw new NotImplementedException($"Unknown VMRS 0x{op.RawOpCode:X} at 0x{op.Address:X}.");
}
}
public static void Vmsr(ArmEmitterContext context)
{
OpCode32SimdSpecial op = (OpCode32SimdSpecial)context.CurrOp;
switch (op.Sreg)
{
case 0b0000: // FPSID
throw new NotImplementedException("Supervisor Only");
case 0b0001: // FPSCR
EmitSetFpscr(context);
return;
case 0b0101: // MVFR2
throw new NotImplementedException("MVFR2");
case 0b0110: // MVFR1
throw new NotImplementedException("MVFR1");
case 0b0111: // MVFR0
throw new NotImplementedException("MVFR0");
case 0b1000: // FPEXC
throw new NotImplementedException("Supervisor Only");
default:
throw new NotImplementedException($"Unknown VMSR 0x{op.RawOpCode:X} at 0x{op.Address:X}.");
}
}
private static void EmitSetNzcv(ArmEmitterContext context, Operand t)
{
Operand v = context.BitwiseAnd(context.ShiftRightUI(t, Const((int)PState.VFlag)), Const(1));
Operand c = context.BitwiseAnd(context.ShiftRightUI(t, Const((int)PState.CFlag)), Const(1));
Operand z = context.BitwiseAnd(context.ShiftRightUI(t, Const((int)PState.ZFlag)), Const(1));
Operand n = context.BitwiseAnd(context.ShiftRightUI(t, Const((int)PState.NFlag)), Const(1));
SetFlag(context, PState.VFlag, v);
SetFlag(context, PState.CFlag, c);
SetFlag(context, PState.ZFlag, z);
SetFlag(context, PState.NFlag, n);
}
private static void EmitGetFpscr(ArmEmitterContext context)
{
OpCode32SimdSpecial op = (OpCode32SimdSpecial)context.CurrOp;
Operand fpscr = Const(0);
for (int flag = 0; flag < RegisterConsts.FpFlagsCount; flag++)
{
if (FPSCR.Mask.HasFlag((FPSCR)(1u << flag)))
{
fpscr = context.BitwiseOr(fpscr, context.ShiftLeft(GetFpFlag((FPState)flag), Const(flag)));
}
}
SetIntA32(context, op.Rt, fpscr);
}
private static void EmitSetFpscr(ArmEmitterContext context)
{
OpCode32SimdSpecial op = (OpCode32SimdSpecial)context.CurrOp;
Operand fpscr = GetIntA32(context, op.Rt);
for (int flag = 0; flag < RegisterConsts.FpFlagsCount; flag++)
{
if (FPSCR.Mask.HasFlag((FPSCR)(1u << flag)))
{
SetFpFlag(context, (FPState)flag, context.BitwiseAnd(context.ShiftRightUI(fpscr, Const(flag)), Const(1)));
}
}
context.UpdateArmFpMode();
}
private static Operand EmitGetTpidrEl0(ArmEmitterContext context)
{
OpCode32System op = (OpCode32System)context.CurrOp;
Operand nativeContext = context.LoadArgument(OperandType.I64, 0);
return context.Load(OperandType.I64, context.Add(nativeContext, Const((ulong)NativeContext.GetTpidrEl0Offset())));
}
private static Operand EmitGetTpidrroEl0(ArmEmitterContext context)
{
OpCode32System op = (OpCode32System)context.CurrOp;
Operand nativeContext = context.LoadArgument(OperandType.I64, 0);
return context.Load(OperandType.I64, context.Add(nativeContext, Const((ulong)NativeContext.GetTpidrroEl0Offset())));
}
private static void EmitSetTpidrEl0(ArmEmitterContext context)
{
OpCode32System op = (OpCode32System)context.CurrOp;
Operand value = GetIntA32(context, op.Rt);
Operand nativeContext = context.LoadArgument(OperandType.I64, 0);
context.Store(context.Add(nativeContext, Const((ulong)NativeContext.GetTpidrEl0Offset())), context.ZeroExtend32(OperandType.I64, value));
}
}
}
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