PC3000指示灯的含义（供新手研究） ... IDNF: ID not found 寻找ID失败 ABR: Abort command 指令中断 TONF: Track not found 寻轨失败 ...
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你可以设置一些寄存器，并发出一个系统调用指令(或中断)，并由陷阱处理程序直接调用内核代码。
You set some registers and issue a system call instruction (or an interrupt) and have the kernel code called directly from the trap handler.
当它运行时，它会记录每次系统时钟中断发生时正在执行的指令的地址。
While it is running, it records the address of the instruction that is being executed every time a system-clock interrupt occurs.
大家都知道，不可能“半途”中断一条机器指令。
As you know a single machine instruction cannot be interrupted "mid-stream".
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