The first part of the stack frame is the non-volatile register save area.
堆栈帧的第一个部分是非易失性寄存器保存区。
The link register save area is different from the other parts of the ABI.
链接寄存器保存区与 ABI 的其他部分不同。
As I mentioned earlier, LR_OFFSET is the offset from the end of the stack to the link register save area.
正如我先前提到的，LR_OFFSET是堆栈末端到链接寄存器保存区的偏移量。
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