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using ARMeilleure.Decoders;
using ARMeilleure.State;
using ARMeilleure.Translation;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.IntermediateRepresentation.OperandHelper;
namespace ARMeilleure.Instructions
{
static partial class InstEmit32
{
public static void B(ArmEmitterContext context)
{
IOpCode32BImm op = (IOpCode32BImm)context.CurrOp;
if (context.CurrBlock.Branch != null)
{
context.Branch(context.GetLabel((ulong)op.Immediate));
}
else
{
context.StoreToContext();
context.Return(Const(op.Immediate));
}
}
public static void Bl(ArmEmitterContext context)
{
Blx(context, x: false);
}
public static void Blx(ArmEmitterContext context)
{
Blx(context, x: true);
}
public static void Bx(ArmEmitterContext context)
{
IOpCode32BReg op = (IOpCode32BReg)context.CurrOp;
context.StoreToContext();
EmitBxWritePc(context, GetIntA32(context, op.Rm));
}
private static void Blx(ArmEmitterContext context, bool x)
{
IOpCode32BImm op = (IOpCode32BImm)context.CurrOp;
uint pc = op.GetPc();
bool isThumb = IsThumb(context.CurrOp);
uint currentPc = isThumb
? op.GetPc() | 1
: op.GetPc() - 4;
SetIntOrSP(context, GetBankedRegisterAlias(context.Mode, RegisterAlias.Aarch32Lr), Const(currentPc));
// 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)
{
SetFlag(context, PState.TFlag, Const(isThumb ? 0 : 1));
}
InstEmitFlowHelper.EmitCall(context, (ulong)op.Immediate);
}
}
}
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