func (t *Thread) resume() error {
t.running = true
var res C.WINBOOL
t.dbp.execPtraceFunc(func() {
//TODO: Note that we are ignoring the thread we were asked to continue and are continuing the
//thread that we last broke on.
res = C.ContinueDebugEvent(C.DWORD(t.dbp.Pid), C.DWORD(t.ID), C.DBG_CONTINUE)
})
if res == C.FALSE {
return fmt.Errorf("could not ContinueDebugEvent.")
}
return nil
}
func (dbp *Process) waitForDebugEvent() (threadID, exitCode int, err error) {
var debugEvent C.DEBUG_EVENT
for {
// Wait for a debug event...
res := C.WaitForDebugEvent(&debugEvent, C.INFINITE)
if res == C.FALSE {
return 0, 0, fmt.Errorf("could not WaitForDebugEvent")
}
// ... handle each event kind ...
unionPtr := unsafe.Pointer(&debugEvent.u[0])
switch debugEvent.dwDebugEventCode {
case C.CREATE_PROCESS_DEBUG_EVENT:
debugInfo := (*C.CREATE_PROCESS_DEBUG_INFO)(unionPtr)
hFile := debugInfo.hFile
if hFile != C.HANDLE(uintptr(0)) /* NULL */ && hFile != C.HANDLE(uintptr(0xFFFFFFFFFFFFFFFF)) /* INVALID_HANDLE_VALUE */ {
res = C.CloseHandle(hFile)
if res == C.FALSE {
return 0, 0, fmt.Errorf("could not close create process file handle")
}
}
dbp.os.hProcess = sys.Handle(debugInfo.hProcess)
_, err = dbp.addThread(sys.Handle(debugInfo.hThread), int(debugEvent.dwThreadId), false)
if err != nil {
return 0, 0, err
}
break
case C.CREATE_THREAD_DEBUG_EVENT:
debugInfo := (*C.CREATE_THREAD_DEBUG_INFO)(unionPtr)
_, err = dbp.addThread(sys.Handle(debugInfo.hThread), int(debugEvent.dwThreadId), false)
if err != nil {
return 0, 0, err
}
break
case C.EXIT_THREAD_DEBUG_EVENT:
delete(dbp.Threads, int(debugEvent.dwThreadId))
break
case C.OUTPUT_DEBUG_STRING_EVENT:
//TODO: Handle debug output strings
break
case C.LOAD_DLL_DEBUG_EVENT:
debugInfo := (*C.LOAD_DLL_DEBUG_INFO)(unionPtr)
hFile := debugInfo.hFile
if hFile != C.HANDLE(uintptr(0)) /* NULL */ && hFile != C.HANDLE(uintptr(0xFFFFFFFFFFFFFFFF)) /* INVALID_HANDLE_VALUE */ {
res = C.CloseHandle(hFile)
if res == C.FALSE {
return 0, 0, fmt.Errorf("could not close DLL load file handle")
}
}
break
case C.UNLOAD_DLL_DEBUG_EVENT:
break
case C.RIP_EVENT:
break
case C.EXCEPTION_DEBUG_EVENT:
tid := int(debugEvent.dwThreadId)
dbp.os.breakThread = tid
return tid, 0, nil
case C.EXIT_PROCESS_DEBUG_EVENT:
debugInfo := (*C.EXIT_PROCESS_DEBUG_INFO)(unionPtr)
return 0, int(debugInfo.dwExitCode), nil
default:
return 0, 0, fmt.Errorf("unknown debug event code: %d", debugEvent.dwDebugEventCode)
}
// .. and then continue unless we received an event that indicated we should break into debugger.
res = C.ContinueDebugEvent(debugEvent.dwProcessId, debugEvent.dwThreadId, C.DBG_CONTINUE)
if res == C.WINBOOL(0) {
return 0, 0, fmt.Errorf("could not ContinueDebugEvent")
}
}
}
func (t *Thread) singleStep() error {
var context C.CONTEXT
context.ContextFlags = C.CONTEXT_ALL
// Set the processor TRAP flag
res := C.GetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not GetThreadContext")
}
context.EFlags |= 0x100
res = C.SetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not SetThreadContext")
}
// Suspend all threads except this one
for _, thread := range t.dbp.Threads {
if thread.ID == t.ID {
continue
}
res := C.SuspendThread(C.HANDLE(thread.os.hThread))
if res == C.DWORD(0xFFFFFFFF) {
return fmt.Errorf("could not suspend thread: %d", thread.ID)
}
}
// Continue and wait for the step to complete
t.dbp.execPtraceFunc(func() {
res = C.ContinueDebugEvent(C.DWORD(t.dbp.Pid), C.DWORD(t.ID), C.DBG_CONTINUE)
})
if res == C.FALSE {
return fmt.Errorf("could not ContinueDebugEvent.")
}
_, err := t.dbp.trapWait(0)
if err != nil {
return err
}
// Resume all threads except this one
for _, thread := range t.dbp.Threads {
if thread.ID == t.ID {
continue
}
res := C.ResumeThread(C.HANDLE(thread.os.hThread))
if res == C.DWORD(0xFFFFFFFF) {
return fmt.Errorf("ould not resume thread: %d", thread.ID)
}
}
// Unset the processor TRAP flag
res = C.GetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not GetThreadContext")
}
context.EFlags &= ^C.DWORD(0x100)
res = C.SetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not SetThreadContext")
}
return nil
}
