堆栈帧中的最后一个条目是一个指向前一堆栈帧的指针，通常被称为后向指针（back pointer）。

The final item in the stack frame is a pointer to the previous stack frame, often called the back pointer.

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接下来，当前堆栈框架指针会被存储为指向下一个堆栈框架的后向指针，虽然尚未建立堆栈框架(这是通过负的偏移量实现的)。

Next, the current stack frame pointer is stored as the back pointer for the next stack frame, even though you haven't established the stack frame yet (this is done through negative offsets).

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