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using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System;
using System.Reflection;
using System.Reflection.Emit;
namespace ChocolArm64.Instructions
{
static partial class InstEmit
{
public static void Hint(ILEmitterCtx context)
{
//Execute as no-op.
}
public static void Isb(ILEmitterCtx context)
{
//Execute as no-op.
}
public static void Mrs(ILEmitterCtx context)
{
OpCodeSystem64 op = (OpCodeSystem64)context.CurrOp;
context.EmitLdarg(TranslatedSub.StateArgIdx);
string propName;
switch (GetPackedId(op))
{
case 0b11_011_0000_0000_001: propName = nameof(CpuThreadState.CtrEl0); break;
case 0b11_011_0000_0000_111: propName = nameof(CpuThreadState.DczidEl0); break;
case 0b11_011_0100_0100_000: propName = nameof(CpuThreadState.Fpcr); break;
case 0b11_011_0100_0100_001: propName = nameof(CpuThreadState.Fpsr); break;
case 0b11_011_1101_0000_010: propName = nameof(CpuThreadState.TpidrEl0); break;
case 0b11_011_1101_0000_011: propName = nameof(CpuThreadState.Tpidr); break;
case 0b11_011_1110_0000_000: propName = nameof(CpuThreadState.CntfrqEl0); break;
case 0b11_011_1110_0000_001: propName = nameof(CpuThreadState.CntpctEl0); break;
default: throw new NotImplementedException($"Unknown MRS at {op.Position:x16}");
}
context.EmitCallPropGet(typeof(CpuThreadState), propName);
PropertyInfo propInfo = typeof(CpuThreadState).GetProperty(propName);
if (propInfo.PropertyType != typeof(long) &&
propInfo.PropertyType != typeof(ulong))
{
context.Emit(OpCodes.Conv_U8);
}
context.EmitStintzr(op.Rt);
}
public static void Msr(ILEmitterCtx context)
{
OpCodeSystem64 op = (OpCodeSystem64)context.CurrOp;
context.EmitLdarg(TranslatedSub.StateArgIdx);
context.EmitLdintzr(op.Rt);
string propName;
switch (GetPackedId(op))
{
case 0b11_011_0100_0100_000: propName = nameof(CpuThreadState.Fpcr); break;
case 0b11_011_0100_0100_001: propName = nameof(CpuThreadState.Fpsr); break;
case 0b11_011_1101_0000_010: propName = nameof(CpuThreadState.TpidrEl0); break;
default: throw new NotImplementedException($"Unknown MSR at {op.Position:x16}");
}
PropertyInfo propInfo = typeof(CpuThreadState).GetProperty(propName);
if (propInfo.PropertyType != typeof(long) &&
propInfo.PropertyType != typeof(ulong))
{
context.Emit(OpCodes.Conv_U4);
}
context.EmitCallPropSet(typeof(CpuThreadState), propName);
}
public static void Nop(ILEmitterCtx context)
{
//Do nothing.
}
public static void Sys(ILEmitterCtx context)
{
//This instruction is used to do some operations on the CPU like cache invalidation,
//address translation and the like.
//We treat it as no-op here since we don't have any cache being emulated anyway.
OpCodeSystem64 op = (OpCodeSystem64)context.CurrOp;
switch (GetPackedId(op))
{
case 0b11_011_0111_0100_001:
{
//DC ZVA
for (int offs = 0; offs < (4 << CpuThreadState.DczSizeLog2); offs += 8)
{
context.EmitLdintzr(op.Rt);
context.EmitLdc_I(offs);
context.Emit(OpCodes.Add);
context.EmitLdc_I8(0);
InstEmitMemoryHelper.EmitWriteCall(context, 3);
}
break;
}
//No-op
case 0b11_011_0111_1110_001: //DC CIVAC
break;
}
}
private static int GetPackedId(OpCodeSystem64 op)
{
int id;
id = op.Op2 << 0;
id |= op.CRm << 3;
id |= op.CRn << 7;
id |= op.Op1 << 11;
id |= op.Op0 << 14;
return id;
}
}
}
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