继续调用键不安全的函数，使用所设置的连接寄存器，以便被调用的函数返回下面的下一个步骤。

Proceed to call the key-unsafe function, with the link register set, so that the called function returns to the next step below.

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你也可以设置断点并检查特定内存地址或寄存器的内容。

You can also set breakpoints and examine the contents of specific memory locations and registers.

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由于已经正确设置了(模拟)寄存器的值，IS r会正常进行处理，就仿佛它是一个真正的中断。

Since you have already set the (simulated) register values appropriately, the ISR will process normally as if it was a real interrupt.

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