private void OnHalted(HaltArguments args)
{
switch(args.Reason)
{
case HaltReason.Breakpoint:
switch(args.BreakpointType)
{
case BreakpointType.AccessWatchpoint:
case BreakpointType.WriteWatchpoint:
case BreakpointType.ReadWatchpoint:
beforeCommand += cmd =>
{
commandsCounter++;
if(commandsCounter > 15)
{
// this is a hack!
// I noticed that GDB will send `step` command after receiving
// information about watchpoint being hit.
// As a result cpu would execute next instruction and stop again.
// To prevent this situation we wait for `step` and ignore it, but
// only in small time window (15 - instructions, value choosen at random)
// and only after sending watchpoint-related stop reply.
this.Log(LogLevel.Error, "Expected step command after watchpoint. Further debugging might not work properly");
beforeCommand = null;
commandsCounter = 0;
return false;
}
if((cmd is SingleStepCommand))
{
SendPacket(new Packet(PacketData.StopReply(TrapSignal)));
beforeCommand = null;
commandsCounter = 0;
return true;
}
return false;
};
goto case BreakpointType.HardwareBreakpoint;
case BreakpointType.HardwareBreakpoint:
case BreakpointType.MemoryBreakpoint:
SendPacket(new Packet(PacketData.StopReply(args.BreakpointType.Value, args.Address)));
break;
}
return;
case HaltReason.Step:
case HaltReason.Pause:
SendPacket(new Packet(PacketData.StopReply(TrapSignal)));
return;
case HaltReason.Abort:
SendPacket(new Packet(PacketData.AbortReply(AbortSignal)));
return;
default:
throw new ArgumentException("Unexpected halt reason");
}
}
private void InnerPause(HaltArguments haltArgs)
{
if(PauseEvent.WaitOne(0))
{
// cpu is already paused
return;
}
lock(pauseLock)
{
PauseEvent.Set();
TlibSetPaused();
if(Thread.CurrentThread.ManagedThreadId != cpuThread.ManagedThreadId)
{
this.NoisyLog("Waiting for thread to pause.");
sync.Pass();
cpuThread.Join();
this.NoisyLog("Paused.");
cpuThread = null;
TlibClearPaused();
}
else
{
pauseGuard.OrderPause();
}
}
InvokeHalted(haltArgs);
}
private void InvokeHalted(HaltArguments arguments)
{
var halted = Halted;
if(halted != null)
{
halted(arguments);
}
}
public void EnterSingleStepModeSafely(HaltArguments args)
{
// this method should only be called from CPU thread,
// but we should check it anyway
CheckCpuThreadId();
TlibSetPaused();
InvokeInCpuThreadSafely(() =>
{
ExecutionMode = ExecutionMode.SingleStep;
TlibClearPaused();
if(args != null)
{
InvokeHalted(args);
}
});
}