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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假如你把原始的值入栈，你将能够通过寄存器% ebp引用对应存储的参数，甚至你仍能继续使用(增加值到堆栈)堆栈。

If you save the original value of the stack, you can refer to the stored arguments via the EBP register, while you can still use (add values to) the stack.

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