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129 lines
3.6 KiB
C#
129 lines
3.6 KiB
C#
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using ARMeilleure.Decoders;
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.State;
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using ARMeilleure.Translation;
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using static ARMeilleure.Instructions.InstEmitHelper;
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using static ARMeilleure.Instructions.InstEmitAluHelper;
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using static ARMeilleure.IntermediateRepresentation.OperandHelper;
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namespace ARMeilleure.Instructions
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{
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static partial class InstEmit32
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{
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public static void Add(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Add(n, m);
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if (op.SetFlags)
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{
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EmitNZFlagsCheck(context, res);
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EmitAddsCCheck(context, n, res);
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EmitAddsVCheck(context, n, m, res);
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}
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EmitAluStore(context, res);
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}
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public static void Cmp(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Subtract(n, m);
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EmitNZFlagsCheck(context, res);
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EmitSubsCCheck(context, n, res);
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EmitSubsVCheck(context, n, m, res);
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}
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public static void Mov(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand m = GetAluM(context);
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if (op.SetFlags)
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{
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EmitNZFlagsCheck(context, m);
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}
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EmitAluStore(context, m);
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}
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public static void Sub(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Subtract(n, m);
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if (op.SetFlags)
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{
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EmitNZFlagsCheck(context, res);
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EmitSubsCCheck(context, n, res);
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EmitSubsVCheck(context, n, m, res);
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}
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EmitAluStore(context, res);
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}
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private static void EmitAluStore(ArmEmitterContext context, Operand value)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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if (op.Rd == RegisterAlias.Aarch32Pc)
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{
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if (op.SetFlags)
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{
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// TODO: Load SPSR etc.
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Operand isThumb = GetFlag(PState.TFlag);
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Operand lblThumb = Label();
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context.BranchIfTrue(lblThumb, isThumb);
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context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseAnd(value, Const(~3))));
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context.MarkLabel(lblThumb);
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context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseAnd(value, Const(~1))));
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}
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else
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{
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EmitAluWritePc(context, value);
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}
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}
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else
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{
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SetIntA32(context, op.Rd, value);
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}
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}
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private static void EmitAluWritePc(ArmEmitterContext context, Operand value)
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{
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context.StoreToContext();
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if (IsThumb(context.CurrOp))
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{
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context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseAnd(value, Const(~1))));
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}
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else
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{
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EmitBxWritePc(context, value);
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}
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}
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}
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}
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