如果内核编译期间设置了CONFIG_FRAME _ POINTER选项，那么就用帧指针寄存器来维护堆栈，从而就可以正确地执行堆栈回溯。

If the CONFIG_FRAME_POINTER option was set during kernel compilation, the frame pointer register is used to maintain stacks and, hence, the stack traceback can be performed correctly.

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切换可信连接用户时，它重置所有连接属性，包括保留指针、隔离、绑定选项、代码页面等等。

When a trusted connection user is switched, it resets all the connection attributes, including cursor with hold, isolation, bind options, codepage, and so on.

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mbackchain 和 -mno-backchain：这些选项控制调用方帧的地址是否作为 “backchain” 指针存储到被调用方的堆栈帧。

mbackchain and -mno-backchain: These options control whether the address of the caller's frame is stored as so-called "backchain" pointer into the callee's stack frame.

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