Powerpc and software single step

[Andrew Cagney]

> I do not see a way to assign this function pointer off of the set
>> command, unless there is a some trick I did not see.
>> maybe we could fix this with more code, but sadly I'm limited in my
>> ability to push out patches under the current circumstances.
>> 
>> But all of these solutions are not the real one which probably takes
>> more commitment then available (at least from me at the moment ;-)
> 
> 
> set_gdbarch_software_single_step?  You couldn't do it
> architecture-independently, perhaps.

That would be wrong.  An architecture vector should not change 
underneath GDB's feet.

It may be possible to wrap software single step's predicate in a 
function that, like the remote protocol, returns the predicate, or 
always false.

Andrew