精确中断是实现软中断调试的关键。
由于所有消息都按顺序处理，应用程序流不会被回调和中断分离，因此更容易调试。
Easier to debug because the messages are all handled sequentially and the flow is not disjointed by callbacks and interrupts.
对于调试来说，它是很有价值的，它允许调试器中断操作系统代码、并检查硬件寄存器。
It is useful for debugging purposes by letting the debugger break into operating system code and examining the hardware registers.
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