public string ParseRequest(GDBPacket packet, out bool isSignal)
{
var result = StandartAnswers.Empty;
isSignal = false;
// ctrl+c is SIGINT
if (packet.GetBytes()[0] == 0x03)
{
_target.DoStop();
result = StandartAnswers.Interrupt;
isSignal = true;
}
try
{
switch (packet.CommandName)
{
case '\0': // Command is empty ("+" in 99.99% cases)
return(null);
case 'q':
result = GeneralQueryResponse(packet); break;
case 'Q':
result = GeneralQueryResponse(packet); break;
case '?':
result = GetTargetHaltedReason(packet); break;
case '!': // extended connection
break;
case 'g': // read registers
result = ReadRegisters(packet); break;
case 'G': // write registers
result = WriteRegisters(packet); break;
case 'm': // read memory
result = ReadMemory(packet); break;
case 'M': // write memory
result = WriteMemory(packet); break;
case 'X': // write memory binary
// Not implemented yet, client shoul use M instead
//result = StandartAnswers.OK;
break;
case 'p': // get single register
result = GetRegister(packet); break;
case 'P': // set single register
result = SetRegister(packet); break;
case 'v': // some requests, mainly vCont
result = ExecutionRequest(packet); break;
case 's': //stepi
_target.CPU.ExecCycle();
result = "T05";
break;
case 'z': // remove bp
result = RemoveBreakpoint(packet);
break;
case 'Z': // insert bp
result = SetBreakpoint(packet);
break;
case 'k': // Kill the target
break;
case 'H': // set thread
result = StandartAnswers.OK; // we do not have threads, so ignoring this command is OK
break;
case 'c': // continue
_target.DoRun();
result = null;
break;
case 'D': // Detach from client
_target.DoRun();
result = StandartAnswers.OK;
break;
}
}
catch (Exception ex)
{
_target.LogException?.Invoke(ex);
result = GetErrorAnswer(Errno.EPERM);
}
if (result == null)
{
return("+");
}
else
{
return(FormatResponse(result));
}
}
private async Task ProcessGdbClient(TcpClient tcpClient)
{
NetworkStream clientStream = tcpClient.GetStream();
GDBSession session = new GDBSession(_target);
byte[] message = new byte[0x1000];
int bytesRead;
_target.DoStop();
while (true)
{
try
{
bytesRead = await clientStream.ReadAsync(message, 0, 4096);
}
catch (IOException iex)
{
var sex = iex.InnerException as SocketException;
if (sex == null || sex.SocketErrorCode != SocketError.Interrupted)
{
_target.LogException?.Invoke(sex);
}
break;
}
catch (SocketException sex)
{
if (sex.SocketErrorCode != SocketError.Interrupted)
{
_target.LogException?.Invoke(sex);
}
break;
}
catch (Exception ex)
{
_target.LogException?.Invoke(ex);
break;
}
if (bytesRead == 0)
{
//the client has disconnected from the server
break;
}
if (bytesRead > 0)
{
GDBPacket packet = new GDBPacket(message, bytesRead);
_target.Log?.Invoke($"--> {packet}");
bool isSignal;
string response = session.ParseRequest(packet, out isSignal);
if (response != null)
{
if (isSignal)
{
await SendGlobal(response);
}
else
{
await SendResponse(clientStream, response);
}
}
}
}
tcpClient.Client.Shutdown(SocketShutdown.Both);
}