private void ExceptionDebugEvent(Win32Thread thread, ref WinApi.EXCEPTION_DEBUG_INFO info)
{
Console.WriteLine($"IP = {WinApi.GetInstructionPointer(WMainThread)}");
if (info.dwFirstChance == 0)
{
// It's not the first time we encountered this exception, it's an error
// TODO: Error
Console.WriteLine("already encountered exception");
return;
}
// First time encounter
if (info.ExceptionRecord.ExceptionCode == WinApi.EXCEPTION_BREAKPOINT)
{
// A breakpoint was hit
Console.WriteLine("Breakpoint");
SuspendThread(thread);
}
else if (info.ExceptionRecord.ExceptionCode == WinApi.EXCEPTION_SINGLE_STEP)
{
// Trap flag was set
Console.WriteLine("Single step");
SuspendThread(thread);
}
else
{
// Some other exception like avvess violation or division by zero
Console.WriteLine($"Exception: {info.ExceptionRecord.ExceptionCode}");
// TODO: What to do here?
}
}
private void OutputStringDebugEvent(Win32Thread thread, ref WinApi.OUTPUT_DEBUG_STRING_INFO info)
{
Console.WriteLine($"IP = {WinApi.GetInstructionPointer(WMainThread)}");
var message = info.GetMessage(Handle);
Console.WriteLine($"output string: {message}");
// Trivially continuable, handled
WinApi.ContinueDebugThread(thread, true);
}
internal static Win32Thread MakeThreadObject(IntPtr threadHandle)
{
var threadId = GetThreadId(threadHandle);
ErrorOnFalse((Int32)threadId);
var thread = new Win32Thread(threadHandle, threadId);
return(thread);
}
internal static void ContinueDebugThread(Win32Thread thread, bool handled)
{
unsafe
{
Int32 success = ContinueDebugEvent(
((Win32Process)thread.Process).Id,
thread.Id,
handled ? DBG_CONTINUE : DBG_EXCEPTION_NOT_HANDLED);
ErrorOnFalse(success);
}
}
internal static nuint GetInstructionPointer(Win32Thread thread)
{
var arch = RuntimeInformation.ProcessArchitecture;
unsafe
{
if (arch == Architecture.X86)
{
var context = new CONTEXT_X86();
context.ContextFlags = CONTEXT_CONTROL;
var success = GetThreadContext_X86(thread.Handle, &context);
ErrorOnFalse(success);
return(context.Eip);
}
else
{
throw new NotImplementedException($"Architecture {arch} does not support thread context querying");
}
}
}
public void AddThread(Win32Thread thread)
{
Debug.Assert(thread.Win32Process == null);
WThreads.Add(thread);
thread.Win32Process = this;
}
private void RipDebugEvent(Win32Thread thread, ref WinApi.RIP_INFO info)
{
Console.WriteLine("RIP");
// TODO: What to do here?
}
private void SuspendThread(Win32Thread thread)
{
Debug.Assert(suspendedThread == null);
State = Win32ProcessState.Suspended;
suspendedThread = thread;
}
private void UnloadDllDebugEvent(Win32Thread thread, ref WinApi.UNLOAD_DLL_DEBUG_INFO info)
{
Console.WriteLine("unload dll");
// Trivially continuable, handled
WinApi.ContinueDebugThread(thread, true);
}
private void ExitThreadDebugEvent(Win32Thread thread, ref WinApi.EXIT_THREAD_DEBUG_INFO info)
{
Console.WriteLine($"exit thread (code {info.dwExitCode})");
// Trivially continuable, handled
WinApi.ContinueDebugThread(thread, true);
}
internal static void SetTrapFlag(Win32Thread thread, bool on) => ModifyThreadContext(thread.Handle, null, on);
internal static void OffsetInstructionPointer(Win32Thread thread, int offset) => ModifyThreadContext(thread.Handle, offset, null);
