> No need to no-op it, just make a special path of execution within
> locore for the from-kernel case of "ta 3".  You do nwindows saves and
> restores unconditionally.  __builtin_return_address(x) is a very
> useful debugging feature in the kernel.

I know. But I just wish that these goodies were implemented in, say, libgcc
whenever possible.

-pk