Xtensa port

[Maxim Grigoriev]

Thanks for your comments, Daniel,

It's going to take some time to follow your suggestions and fix the patch.
> The stuff I'm working on right now is data-driven (XML) GDB
> descriptions of targets.  It seems like it would make this port
> a whole lot simpler.  Unfortunately, while I plan to contribute
> it ASAP, that still may be a few months.
>   
Whenever you're done with a new scheme, I'd be happy to switch to it.
>> TESTING:
>>
>>    Testing has been done on an Xtensa XT2000 evaluation board under 
>> JTAG OCD control. GDB used GDB remote protocol to communicate through
>> TCP/IP sockets with an OCD daemon controlling the board. All the
>> changes to the DejaGnu testing frame and some generic GDB code
>> updates are not part of this submission because this testing can not
>> be reproduced outside Tensilica as of yet.
>>     
>
> Does this mean that you need patches to more of GDB to use the code
> that you're posting?
>   
Yes. The next update will include GNU/Linux Xtensa support including 
gdbserver port. The reason why it wasn't submitted now is it wasn't 
tested yet. As I mentioned, to test this particular submission, I used 
an Xtensa evaluation board under JTAG OCD control. I believe the changes 
required for this testing are not useful for GDB community. If you're 
interested in how do they look like I can send them separately.

I'll take care of the rest of your comments and resend the patch.

-- Maxim