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TSR Berry 2023-04-08 01:22:00 +02:00 • committed by Mary
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commit cee7121058
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src/ARMeilleure/Instructions/InstEmitFlow32.cs Normal file
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using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.State;
using ARMeilleure.Translation;
using static ARMeilleure.Instructions.InstEmitFlowHelper;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
namespace ARMeilleure.Instructions
{
static partial class InstEmit32
{
public static void B(ArmEmitterContext context)
{
IOpCode32BImm op = (IOpCode32BImm)context.CurrOp;
context.Branch(context.GetLabel((ulong)op.Immediate));
}
public static void Bl(ArmEmitterContext context)
{
Blx(context, x: false);
}
public static void Blx(ArmEmitterContext context)
{
Blx(context, x: true);
}
private static void Blx(ArmEmitterContext context, bool x)
{
IOpCode32BImm op = (IOpCode32BImm)context.CurrOp;
uint pc = op.GetPc();
bool isThumb = ((OpCode32)context.CurrOp).IsThumb;
uint currentPc = isThumb
? pc | 1
: pc - 4;
SetIntA32(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));
}
EmitCall(context, (ulong)op.Immediate);
}
public static void Blxr(ArmEmitterContext context)
{
IOpCode32BReg op = (IOpCode32BReg)context.CurrOp;
uint pc = op.GetPc();
Operand addr = context.Copy(GetIntA32(context, op.Rm));
Operand bitOne = context.BitwiseAnd(addr, Const(1));
bool isThumb = ((OpCode32)context.CurrOp).IsThumb;
uint currentPc = isThumb
? (pc - 2) | 1
: pc - 4;
SetIntA32(context, GetBankedRegisterAlias(context.Mode, RegisterAlias.Aarch32Lr), Const(currentPc));
SetFlag(context, PState.TFlag, bitOne);
EmitBxWritePc(context, addr);
}
public static void Bx(ArmEmitterContext context)
{
IOpCode32BReg op = (IOpCode32BReg)context.CurrOp;
EmitBxWritePc(context, GetIntA32(context, op.Rm), op.Rm);
}
public static void Cbnz(ArmEmitterContext context) => EmitCb(context, onNotZero: true);
public static void Cbz(ArmEmitterContext context) => EmitCb(context, onNotZero: false);
private static void EmitCb(ArmEmitterContext context, bool onNotZero)
{
OpCodeT16BImmCmp op = (OpCodeT16BImmCmp)context.CurrOp;
Operand value = GetIntA32(context, op.Rn);
Operand lblTarget = context.GetLabel((ulong)op.Immediate);
if (onNotZero)
{
context.BranchIfTrue(lblTarget, value);
}
else
{
context.BranchIfFalse(lblTarget, value);
}
}
public static void It(ArmEmitterContext context)
{
OpCodeT16IfThen op = (OpCodeT16IfThen)context.CurrOp;
context.SetIfThenBlockState(op.IfThenBlockConds);
}
public static void Tbb(ArmEmitterContext context) => EmitTb(context, halfword: false);
public static void Tbh(ArmEmitterContext context) => EmitTb(context, halfword: true);
private static void EmitTb(ArmEmitterContext context, bool halfword)
{
OpCodeT32Tb op = (OpCodeT32Tb)context.CurrOp;
Operand halfwords;
if (halfword)
{
Operand address = context.Add(GetIntA32(context, op.Rn), context.ShiftLeft(GetIntA32(context, op.Rm), Const(1)));
halfwords = InstEmitMemoryHelper.EmitReadInt(context, address, 1);
}
else
{
Operand address = context.Add(GetIntA32(context, op.Rn), GetIntA32(context, op.Rm));
halfwords = InstEmitMemoryHelper.EmitReadIntAligned(context, address, 0);
}
Operand targetAddress = context.Add(Const((int)op.GetPc()), context.ShiftLeft(halfwords, Const(1)));
EmitVirtualJump(context, targetAddress, isReturn: false);
}
}
}