Re: PATCH: 6/6 [2nd try]: Add AVX support (gdbserver changes)

[Daniel Jacobowitz <dan@codesourcery.com>]

On Sat, Mar 27, 2010 at 06:11:31PM -0700, H.J. Lu wrote:
> I just follow the current format where SSE register set is marked with
> EXTENDED_REGS for i386 and FP_REGS for x86-64. I don't mind
> changing it to either of them for both i386 and x86-64. Just let me
> know which one I should use.

The only reason they're separate is that there was an FP_REGS already.
It doesn't make any difference to the implementation.  I suggest
EXTENDED_REGS unconditionally.

> Yes, I have tested them. The logic is in x86_linux_process_qsupported
> which will set XML target to AVX if AVX is supported.

Then you don't need to change USE_XML at all.

Your goal is not to turn off support for "XML".  Your goal is to not
report the AVX register description.  Before all your patches,
gdbserver would have reported a tiny target description that
contained the OSABI (e.g. "<osabi>GNU/Linux</osabi>").  That goes in
gdbserver_xmltarget using the "@" prefix that this function checks
for.

I suggest building such an older gdbserver, to see what it returns.

> > I think it'll work if you remove use_xml, and leave USE_XML alone.  If
> > GDB does not support XML, you can adjust gdbserver_xmltarget to report
> > just the architecture and OSABI the way it did before you added
> > register XML files.
> >
> 
> I don't know how gdbserver_xmltarget should be set if gdb doesn't support
> XML. My current approach is to turn off XML support at run-time even if
> USE_XML is 1 when gdb doesn't support XML.

Look at what USE_XML controls.  You do not need to turn off this block
of code.

-- 
Daniel Jacobowitz
CodeSourcery