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。
A function may use as little or as much memory in this save area as needed.
函数可以根据需要使用这个保存区中任意大小的内存。
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