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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 InstEmit
{
private const int DczSizeLog2 = 4; // Log2 size in words
public const int DczSizeInBytes = 4 << DczSizeLog2;
public static void Isb(ArmEmitterContext context)
{
// Execute as no-op.
}
public static void Mrs(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
MethodInfo info;
switch (GetPackedId(op))
{
case 0b11_011_0000_0000_001: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetCtrEl0)); break;
case 0b11_011_0000_0000_111: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetDczidEl0)); break;
case 0b11_011_0100_0010_000: EmitGetNzcv(context); return;
case 0b11_011_0100_0100_000: EmitGetFpcr(context); return;
case 0b11_011_0100_0100_001: EmitGetFpsr(context); return;
case 0b11_011_1101_0000_010: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetTpidrEl0)); break;
case 0b11_011_1101_0000_011: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetTpidrroEl0)); break;
case 0b11_011_1110_0000_000: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetCntfrqEl0)); break;
case 0b11_011_1110_0000_001: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetCntpctEl0)); break;
case 0b11_011_1110_0000_010: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetCntvctEl0)); break;
default: throw new NotImplementedException($"Unknown MRS 0x{op.RawOpCode:X8} at 0x{op.Address:X16}.");
}
SetIntOrZR(context, op.Rt, context.Call(info));
}
public static void Msr(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
MethodInfo info;
switch (GetPackedId(op))
{
case 0b11_011_0100_0010_000: EmitSetNzcv(context); return;
case 0b11_011_0100_0100_000: EmitSetFpcr(context); return;
case 0b11_011_0100_0100_001: EmitSetFpsr(context); return;
case 0b11_011_1101_0000_010: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.SetTpidrEl0)); break;
default: throw new NotImplementedException($"Unknown MSR 0x{op.RawOpCode:X8} at 0x{op.Address:X16}.");
}
context.Call(info, GetIntOrZR(context, op.Rt));
}
public static void Nop(ArmEmitterContext context)
{
// Do nothing.
}
public static void Sys(ArmEmitterContext 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.
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
switch (GetPackedId(op))
{
case 0b11_011_0111_0100_001:
{
// DC ZVA
Operand t = GetIntOrZR(context, op.Rt);
for (long offset = 0; offset < DczSizeInBytes; offset += 8)
{
Operand address = context.Add(t, Const(offset));
InstEmitMemoryHelper.EmitStore(context, address, RegisterConsts.ZeroIndex, 3);
}
break;
}
// No-op
case 0b11_011_0111_1110_001: // DC CIVAC
break;
case 0b11_011_0111_0101_001: // IC IVAU
Operand target = Register(op.Rt, RegisterType.Integer, OperandType.I64);
context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.InvalidateCacheLine)), target);
break;
}
}
private static int GetPackedId(OpCodeSystem 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;
}
private static void EmitGetNzcv(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
Operand nzcv = context.ShiftLeft(GetFlag(PState.VFlag), Const((int)PState.VFlag));
nzcv = context.BitwiseOr(nzcv, context.ShiftLeft(GetFlag(PState.CFlag), Const((int)PState.CFlag)));
nzcv = context.BitwiseOr(nzcv, context.ShiftLeft(GetFlag(PState.ZFlag), Const((int)PState.ZFlag)));
nzcv = context.BitwiseOr(nzcv, context.ShiftLeft(GetFlag(PState.NFlag), Const((int)PState.NFlag)));
SetIntOrZR(context, op.Rt, nzcv);
}
private static void EmitGetFpcr(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
Operand fpcr = Const(0);
for (int flag = 0; flag < RegisterConsts.FpFlagsCount; flag++)
{
if (FPCR.Mask.HasFlag((FPCR)(1u << flag)))
{
fpcr = context.BitwiseOr(fpcr, context.ShiftLeft(GetFpFlag((FPState)flag), Const(flag)));
}
}
SetIntOrZR(context, op.Rt, fpcr);
}
private static void EmitGetFpsr(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
Operand fpsr = Const(0);
for (int flag = 0; flag < RegisterConsts.FpFlagsCount; flag++)
{
if (FPSR.Mask.HasFlag((FPSR)(1u << flag)))
{
fpsr = context.BitwiseOr(fpsr, context.ShiftLeft(GetFpFlag((FPState)flag), Const(flag)));
}
}
SetIntOrZR(context, op.Rt, fpsr);
}
private static void EmitSetNzcv(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
Operand nzcv = GetIntOrZR(context, op.Rt);
nzcv = context.ConvertI64ToI32(nzcv);
SetFlag(context, PState.VFlag, context.BitwiseAnd(context.ShiftRightUI(nzcv, Const((int)PState.VFlag)), Const(1)));
SetFlag(context, PState.CFlag, context.BitwiseAnd(context.ShiftRightUI(nzcv, Const((int)PState.CFlag)), Const(1)));
SetFlag(context, PState.ZFlag, context.BitwiseAnd(context.ShiftRightUI(nzcv, Const((int)PState.ZFlag)), Const(1)));
SetFlag(context, PState.NFlag, context.BitwiseAnd(context.ShiftRightUI(nzcv, Const((int)PState.NFlag)), Const(1)));
}
private static void EmitSetFpcr(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
Operand fpcr = GetIntOrZR(context, op.Rt);
fpcr = context.ConvertI64ToI32(fpcr);
for (int flag = 0; flag < RegisterConsts.FpFlagsCount; flag++)
{
if (FPCR.Mask.HasFlag((FPCR)(1u << flag)))
{
SetFpFlag(context, (FPState)flag, context.BitwiseAnd(context.ShiftRightUI(fpcr, Const(flag)), Const(1)));
}
}
}
private static void EmitSetFpsr(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
Operand fpsr = GetIntOrZR(context, op.Rt);
fpsr = context.ConvertI64ToI32(fpsr);
for (int flag = 0; flag < RegisterConsts.FpFlagsCount; flag++)
{
if (FPSR.Mask.HasFlag((FPSR)(1u << flag)))
{
SetFpFlag(context, (FPState)flag, context.BitwiseAnd(context.ShiftRightUI(fpsr, Const(flag)), Const(1)));
}
}
}
}
}
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