internal static void Emulate(VirtualMachine vm, uint count)
{
var processor = vm.Processor;
var memory = vm.PhysicalMemory;
unsafe
{
uint* eip = (uint*)processor.PIP;
for (uint i = 0; i < count; i++)
{
uint startEIP = *eip;
processor.StartEIP = startEIP;
byte* ip = processor.CachedInstruction;
memory.FetchInstruction(processor.segmentBases[(int)SegmentIndex.CS] + startEIP, ip);
uint sizeModeIndex = processor.SizeModeIndex;
byte byte1 = ip[0];
var inst = OneBytePtrs[sizeModeIndex][byte1];
if (inst != null)
{
*eip = startEIP + 1;
processor.CachedIP = ip + 1;
inst(vm);
continue;
}
var instSet = TwoBytePtrs[sizeModeIndex][byte1];
if (instSet != null)
{
inst = instSet[ip[1]];
if (inst != null)
{
*eip = startEIP + 2;
processor.CachedIP = ip + 2;
inst(vm);
continue;
}
}
instSet = RmPtrs[sizeModeIndex][byte1];
if (instSet != null)
{
inst = instSet[Intrinsics.ExtractBits(ip[1], 3, 3, 0x38)];
if (inst == null)
ThrowGetOpcodeException(ip);
*eip = startEIP + 1;
processor.CachedIP = ip + 1;
inst(vm);
continue;
}
var instSetSet = TwoByteRmPtrs[sizeModeIndex][byte1];
if (instSetSet != null)
{
instSet = instSetSet[ip[1]];
if (instSet != null)
{
inst = instSet[Intrinsics.ExtractBits(ip[2], 3, 3, 0x38)];
if (inst != null)
{
*eip = startEIP + 2;
processor.CachedIP = ip + 2;
inst(vm);
continue;
}
}
}
ThrowGetOpcodeException(ip);
}
}
}