在对任何域进行修改之前，都应该将条件寄存器保存到堆栈的这个区域中，然后在返回之前恢复。

The condition register should be saved in its area of the stack before any of these fields are modified, and then restored before returning.

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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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针对有效值限制测试由前面的寄存器地址请求返回的值。

Test the values returned by the preceding register address request against valid value limits.

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