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.
如果没有提供地址，那么它采用当前寄存器来回溯堆栈。
If no address is provided, it takes the current registers to traceback the stack.
因此，为了使用其他寄存器，就必须将其保存到堆栈中。
Therefore, in order to use the other registers, they have to be saved on the stack.
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