The first double word of every frame points to the next frame and this is immediately followed by the address of the calling function.
每一帧的第一个双字（double word）指向下一帧，这后面紧跟着调用函数的地址。
The first double word of every frame points to the next frame and this is immediately followed by the address of the calling function.
每一帧的第一个双字（double word）指向下一帧，这后面紧跟着调用函数的地址。
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