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 RTypeInstruction FromInteger(uint v)
{
var rtype = new RTypeInstruction()
{
Function = (RTypeFunction)(v & 0x3f),
Sa = ((v >> 6) & 0x1f),
Rd = ((v >> 11) & 0x1f),
Rt = ((v >> 16) & 0x1f),
Rs = ((v >> 21) & 0x1f),
};
return(rtype);
}