func isValidLeFunc(f uintptr) error {
	ret := funcptrtest(f, "")
	if ret != 0 {
		return fmt.Errorf("Bad pointer, not an LE function ")
	}
	return nil
}

// Retrieve function name from descriptor
func getLeFuncName(f uintptr) (string, error) {
	// assume it has been checked, only check ppa1 validity here
	entry := ((*[2]uintptr)(unsafe.Pointer(f)))[1]
	preamp := ((*[4]uint32)(unsafe.Pointer(entry - eyecatcherOffset)))