public IInstruction ReadInstruction(uint inst)
{
if (!Enum.IsDefined(typeof(Opcode), inst >> 26))
{
return(UndefinedInstruction.FromInteger(inst));
}
var opcode = (Opcode)(inst >> 26);
switch (opcode)
{
case Opcode.RType:
var rIns = RTypeInstruction.FromInteger(inst);
rIns.Executor = RTypeExecutors[rIns.Function];
return(rIns);
case Opcode.Jump:
case Opcode.JumpAndLink:
var jIns = JTypeInstruction.FromInteger(inst);
jIns.Executor = JTypeExecutors[jIns.JumpType];
return(jIns);
case Opcode.CoProcessor:
var coIns = CoProcessorInstruction.FromInteger(inst);
coIns.Executor = CoProcessorExecutors[coIns.Format];
return(coIns);
default:
var iIns = ITypeInstruction.FromInteger(inst);
iIns.Executor = ITypeExecutors[iIns.Opcode];
return(iIns);
}
}
public static ITypeInstruction FromInteger(uint v)
{
var it = new ITypeInstruction()
{
Opcode = (MIPSI.Opcode)(v >> 26),
Rs = (v >> 21) & 0x1f,
Rt = (v >> 16) & 0x1f,
Immediate = ((ushort)((v) & 0xFFFF))
};
return it;
}
public static ITypeInstruction FromInteger(uint v)
{
var it = new ITypeInstruction()
{
Opcode = (MIPSI.Opcode)(v >> 26),
Rs = (v >> 21) & 0x1f,
Rt = (v >> 16) & 0x1f,
Immediate = ((ushort)((v) & 0xFFFF))
};
return(it);
}