Ryujinx/ChocolArm64/Instructions/InstEmitFlow32.cs

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using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System.Reflection.Emit;
using static ChocolArm64.Instructions.InstEmit32Helper;
namespace ChocolArm64.Instructions
{
static partial class InstEmit32
{
public static void B(ILEmitterCtx context)
{
IOpCodeBImm32 op = (IOpCodeBImm32)context.CurrOp;
if (context.CurrBlock.Branch != null)
{
context.Emit(OpCodes.Br, context.GetLabel(op.Imm));
}
else
{
context.EmitStoreState();
context.EmitLdc_I8(op.Imm);
context.Emit(OpCodes.Ret);
}
}
public static void Bl(ILEmitterCtx context)
{
Blx(context, x: false);
}
public static void Blx(ILEmitterCtx context)
{
Blx(context, x: true);
}
public static void Bx(ILEmitterCtx context)
{
IOpCodeBReg32 op = (IOpCodeBReg32)context.CurrOp;
context.EmitStoreState();
EmitLoadFromRegister(context, op.Rm);
EmitBxWritePc(context);
}
private static void Blx(ILEmitterCtx context, bool x)
{
IOpCodeBImm32 op = (IOpCodeBImm32)context.CurrOp;
uint pc = op.GetPc();
bool isThumb = IsThumb(context.CurrOp);
if (!isThumb)
{
context.EmitLdc_I(op.GetPc() - 4);
}
else
{
context.EmitLdc_I(op.GetPc() | 1);
}
context.EmitStint(GetBankedRegisterAlias(context.Mode, RegisterAlias.Aarch32Lr));
context.EmitStoreState();
//If x is true, then this is a branch with link and exchange.
//In this case we need to swap the mode between Arm <-> Thumb.
if (x)
{
context.EmitLdc_I4(isThumb ? 0 : 1);
context.EmitStflg((int)PState.TBit);
}
InstEmitFlowHelper.EmitCall(context, op.Imm);
}
private static void EmitBxWritePc(ILEmitterCtx context)
{
context.Emit(OpCodes.Dup);
context.EmitLdc_I4(1);
context.Emit(OpCodes.And);
context.EmitStflg((int)PState.TBit);
context.EmitLdc_I4(~1);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Conv_U8);
context.Emit(OpCodes.Ret);
}
}
}