public static Tuple <COMAMND, MODRM, int> UnPack(int memPiece)
{
COMAMND cop = (COMAMND)(memPiece & 0xf);
MODRM modrm = (MODRM)((memPiece >> 4) & 0x3);
int operand = (memPiece >> 6) & 0x3ffffff;
return(new Tuple <COMAMND, MODRM, int>(cop, modrm, operand));
}
private static string ModRMToStr(MODRM modrm, string operand)
{
switch (modrm)
{
case MODRM.Direct: return("[" + operand + "]");
case MODRM.Imed: return(operand);
case MODRM.Indirect: return("[[" + operand + "]]");
case MODRM.NoOperand: return("");
}
return("??");
}
private static int Pack(COMAMND cop, MODRM modrm, int operand)
{
return(((int)cop) | ((int)modrm << 4) | (operand << 6));
}
static void Run()
{
int state = 1;
while (state != 0)
{
if (dbgIsOn)
{
if (dbgMemEdges != null)
{
Debugger.Debug(rx, pc, mem, pc - dbgCodeScope, pc + dbgCodeScope, dbgMemEdges[0], dbgMemEdges[1]); //debug!!
}
else
{
Debugger.Debug(rx, pc, mem, pc - dbgCodeScope, pc + dbgCodeScope);
}
}
var unpackRes = UnPack(mem[pc]);
COMAMND cop = unpackRes.Item1;
MODRM modrm = unpackRes.Item2;
int operand = unpackRes.Item3;
#region Выбор по коду операции
switch (cop)
{
case COMAMND.NOP: break;
case COMAMND.ADD:
switch (modrm)
{
case MODRM.Imed: Add(operand); break;
case MODRM.Direct: Add(mem[operand]); break;
case MODRM.Indirect: Add(mem[mem[operand]]); break;
default:
HandleError();
break;
}
break;
case COMAMND.SUB:
switch (modrm)
{
case MODRM.Imed: Sub(operand); break;
case MODRM.Direct: Sub(mem[operand]); break;
case MODRM.Indirect: Sub(mem[mem[operand]]); break;
default:
HandleError();
break;
}
break;
case COMAMND.INC:
if (modrm == MODRM.Direct)
{
Inc(operand);
}
else if (modrm == MODRM.Indirect)
{
Inc(mem[operand]);
}
else
{
HandleError();
}
break;
case COMAMND.DEC:
if (modrm == MODRM.Direct)
{
Dec(operand);
}
else if (modrm == MODRM.Indirect)
{
Dec(mem[operand]);
}
else
{
HandleError();
}
break;
case COMAMND.LDR:
if (modrm == MODRM.Imed)
{
Ldr(operand);
}
else if (modrm == MODRM.Direct)
{
Ldr(mem[operand]);
}
else if (modrm == MODRM.Indirect)
{
Ldr(mem[mem[operand]]);
}
else
{
HandleError();
}
break;
case COMAMND.STR:
if (modrm == MODRM.Direct)
{
Str(operand);
}
else if (modrm == MODRM.Indirect)
{
Str(mem[operand]);
}
else
{
HandleError();
}
break;
case COMAMND.IN:
if (modrm == MODRM.NoOperand)
{
In();
}
else
{
HandleError();
}
break;
case COMAMND.OUT:
if (modrm == MODRM.NoOperand)
{
Out();
}
else
{
HandleError();
}
break;
case COMAMND.JMP:
if (modrm == MODRM.Imed)
{
Jmp(operand);
}
else if (modrm == MODRM.Indirect)
{
Jmp(mem[operand]);
}
else
{
HandleError();
}
break;
case COMAMND.IFZ:
if (modrm == MODRM.NoOperand)
{
Ifz();
}
else
{
HandleError();
}
break;
case COMAMND.IFN:
if (modrm == MODRM.NoOperand)
{
Ifn();
}
else
{
HandleError();
}
break;
case COMAMND.HALT:
if (modrm == MODRM.NoOperand)
{
state = 0;
}
else
{
HandleError();
}
break;
default:
if (modrm == MODRM.NoOperand)
{
state = 0;
}
else
{
HandleError();
}
break;
}//switch
#endregion
pc = (pc + 1) % 256;
}//while
}
