Re: Bizarre internal errors in regcache

[Daniel Jacobowitz <drow at mvista dot com>]

On Mon, Aug 26, 2002 at 10:28:08PM +0200, Mark Kettenis wrote:
>    Date: Mon, 26 Aug 2002 15:52:47 -0400
>    From: Daniel Jacobowitz <drow@mvista.com>
> 
>    On Mon, Aug 26, 2002 at 02:56:39PM -0400, Daniel Jacobowitz wrote:
>    > I see this error on my laptop but not on my desktop; both current trees,
>    > both rebuilt from scratch, both i386-linux.  Any ideas?
> 
>    [ snip ]
> 
>    My desktop has SSE, my laptop doesn't, it seems.  We can't call
>    supply_register on an MMX register if we don't have any. 
>    dummy_sse_registers seems to be the culprit.
> 
> Hmm, and my desktop sort of pretends it has the SSE registers.
> 
> Anyway, I'm pretty certain that the problem is caused by the fact that
> the binary produced by the gdb.asm test isn't branded.  Therefore GDB
> doesn't select the Linux OS/ABI but the generic OS/ABI which doesn't
> include the SSE regs.  Since you're running on Linux, the native code
> tries to supply these registers anyway.  i387_supply_fxsave() does
> deal with this gracefully, but dummy_sse_regs() doesn't.
> 
> Can you try the attached patch?

That patch does it for me.  This also shows up on core dumps, if you
don't include a binary, which is where I first noticed it.


-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer