public static void Preserve(RegisterBase reg, Action block)
{
reg.State.Push();
Backup(reg);
block.Invoke();
Restore(reg);
reg.State.Pop();
}
public static void Restore(RegisterBase reg)
{
if (reg is RegisterA)
{
CPU6502.PLA();
A.State.Pop();
}
else if (reg is RegisterX)
{
CPU6502.PLA();
X.Set(A);
X.State.Pop();
}
else if (reg is RegisterY)
{
CPU6502.PLA();
Y.Set(A);
Y.State.Pop();
}
}
public static void Backup(RegisterBase reg)
{
if (reg is RegisterA)
{
CPU6502.PHA();
A.State.Push();
}
else if (reg is RegisterX)
{
CPU6502.TXA();
//Use(Asm.TXA);
CPU6502.PHA();
X.State.Push();
}
else if (reg is RegisterY)
{
CPU6502.TYA();
//Use(Asm.TYA);
CPU6502.PHA();
Y.State.Push();
}
}