Fix solib-disc.exp regression with x86 gdbserver

[H.J. Lu]

On Mon, Apr 12, 2010 at 12:45 AM, Pedro Alves <pedro@codesourcery.com> wrote:
> On Sunday 11 April 2010 22:12:08, H.J. Lu wrote:
>> This patch breaks gdbserver on AVX. We have
>>
>> 1. Connect from GDB with XML support:
>>       gdbserver enables XML support.
>> 2. Disconnect.
>> 3. Reconnect from any GDB
>>        a. gdberver assumes GDB doesn't support XML sets to
>>           target to Linux without AVX.
>>        b. Gdbserver  aborts when it tries to invalidate regcache
>>            since the target doesn't support AVX registers.
>>
>> I will try to fix it.
>>
>
> Then, this means we're invalidating the regcache too late.
> We're flushing the old regcache contents to the threads, that were
> created using the previous gdb's register layout, but we're flushing
> the data using the _new_ register cache layout and low target
> methods.  That sounds wrong indeed.
>
> I think this would help.  Or is this still too late?
>
> --
> Pedro Alves
>
> 2010-04-12  Pedro Alves  <pedro@codesourcery.com>
>
>        gdb/gdbserver/
>        * regcache.c (set_register_cache): Invalidate regcaches before
>        changing the register cache layout.
>        (regcache_invalidate_one): Allow a NULL regcache.
>        * linux-x86-low.c (x86_linux_update_xmltarget): Invalidate
>        regcaches before changing the register cache layout or the target
>        regsets.
>

It works.

Thanks.


-- 
H.J.