public VirtualMachine(int memorySize)
{
if (memorySize < 512 * 1024)
throw new ArgumentOutOfRangeException("memorySize", "VM should have at least 512kB of memory");
Registers = new int[(int)Register.Count];
Memory = new byte[memorySize];
IP = 0;
SP = Memory.Length;
Flags = VmFlags.None;
IVT = 0;
_instruction = new Instruction(this);
_interruptsEnabled = false;
_interrupted = false;
_devices = new IDevice[16];
Attach(this);
_timer = new Devices.Timer();
Attach(_timer);
Attach(new Devices.SysCall());
}
private IEnumerable<Line> Disassemble(Computer target, int ip)
{
var machine = target.Vm;
var debugInfo = target.Code.DebugInfo;
var instruction = new Instruction(machine);
var buffer = new byte[8];
while (true)
{
var instrAddr = machine.IP;
if (instrAddr >= machine.Memory.Length)
break;
ShipDebug.Line? nextLine = null;
if (debugInfo != null)
{
var symbol = debugInfo.FindSymbol(instrAddr);
if (symbol.HasValue && symbol.Value.Address == instrAddr)
yield return new Line(instrAddr, string.Format("< {0} >", symbol.Value.Name), false, 1);
nextLine = debugInfo.FindLine(instrAddr, 1);
}
var decodeFailed = false;
try
{
instruction.Decode();
}
catch
{
decodeFailed = true;
}
if (decodeFailed || !instruction.IsValid || (nextLine.HasValue && instrAddr + instruction.Length > nextLine.Value.Address))
{
if (nextLine.HasValue)
machine.IP = nextLine.Value.Address;
else
machine.IP += 4;
var read = 0;
while (instrAddr <= machine.IP)
{
if (instrAddr >= machine.Memory.Length)
break;
buffer[read++] = machine.Memory[instrAddr++];
if (read == buffer.Length || instrAddr == machine.IP)
{
if (read > 0)
{
var bufferStr = string.Join(", ", buffer.Take(read).Select(v => string.Format("0x{0:X2}", v)));
yield return new Line(instrAddr - read, string.Format(" db {0}", bufferStr), false, 8);
}
read = 0;
}
}
}
else
{
string sourceLine = null;
if (debugInfo != null)
{
var line = debugInfo.FindLine(instrAddr);
if (line.HasValue && line.Value.Address == instrAddr)
sourceLine = string.Format("{0}:{1}", line.Value.FileName, line.Value.LineNumber);
}
var fg = instrAddr == ip ? 4 : 0;
var bg = target.HasBreakpoint(instrAddr) ? 15 : 7;
yield return new Line(instrAddr, string.Format(" {0}", instruction), true, (byte)fg, (byte)bg, sourceLine);
machine.IP += instruction.Length;
}
}
}
