链接寄存器

然后使用lqd$lr，LROFFSET（$sp）恢复链接寄存器。

Then restore the link register using lqd $ lr , LR_OFFSET ( $ sp ) .

在序言中，所要做的第一件事情是保存链接寄存器。

In the prologue , the first thing you do is save the link register .

最后，bi$lr（branchindirect）分支跳转到在链接寄存器内指定的地址（返回地址），进而从函数返回。

Finally , bi $ lr (" branch indirect ") branches to the address specified in the link register ( the return address ), thus returning from the function .

正如我先前提到的，LROFFSET是堆栈末端到链接寄存器保存区的偏移量。

As I mentioned earlier , LR_OFFSET is the offset from the end of the stack to the link register save area .

链接寄存器保存区与ABI的其他部分不同。

The link register save area is different from the other parts of the ABI .

也请注意必须要显式指定链接寄存器。

Notice also that you have to specify the link register explicitly .

lr-链接寄存器的值。

Lr-Value of the link register .

稍后，我会详细介绍链接寄存器，总的来说，它用于临时存储返回地址。

I will get to the link register shortly , but basically it is used for temporary storage of return addresses .

链接寄存器保存区存有被调用函数（而非当前函数）的链接寄存器内容。

The link register save area holds the link register contents of the function being called , rather than for the current function .

请记住链接寄存器存储在调用函数的堆栈框架内，而非函数自身的堆栈框架。

Remember that the link register is stored in the calling function 's stack frame , not the function 's own stack frame .

链接寄存器只在约定的意义上有一些特殊&SPU汇编语言允许在您所选择的任何寄存器内设置链接。

The link register is only special by convention & the SPU assembly language allows you to set the link in any register you choose .

所以，在这个函数中，我们使用了回链指针、链接寄存器保存区和一个本地变量。

So , in this function , we are using the back chain pointer , the link register save area , and one local variable .

所以该指令会将链接寄存器（存有返回地址）存储到调用函数堆栈框架的恰当位置。

So this instruction stores the link register ( which holds the return address ) into the proper location in the calling function 's stack frame .

但由于基线条件并不调用任何其他函数，所以无需从堆栈框架加载链接寄存器&值还在原处。

However , since the base case doesn 't call any other functions , you don 't need to load the link register from the stack frame & the value is still there .

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 .

由于未调用任何函数，也未使用任何本地存储，所以您根本无需堆栈框架，并可通过链接寄存器退出。

Since you did not call any functions or use any local storage , you did not need a stack frame at all , so you can now just exit through the link register .