Thanks for eyeballing this.

> For the MIPS to work, a custom virtual_frame_pointer() function would be 
>> needed.  I don't see any point in implementing this, though, as there is 
>> no tracepoint target to test it against.  Anyway, coments on this aspect 
>> of the patch?    If not, I'll check it in.
>> 
>> [Hmm, need to mention this in the NEWS file.  The MIPS $fp will finally 
>> behave as specified in the documentation.]
> 
> 
> Looks good to me.  And there may someday be a tracepoint target to
> test it against - I hope to add tracepoints to gdbserver, eventually.
> When that happens I can revisit this.

I've so far checked in the attached...

Andrew