当函数开始时，它实际上会将链接寄存器保存到调用函数的堆栈帧中，而不是自己的堆栈帧中，然后只有在需要时才会保存它。
When a function begins, it actually saves the link register in the calling function's stack frame, not its own, and then only if it needs to save it.
手臂帧地连接在一起的其他链接单元。
The arm frames are linked with each other by the link units.
手臂帧地连接在一起的其他链接单元。
The arm frames are linked with each other by the link units.
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