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From: Willy Tarreau <willy@w.ods.org>
To: Andi Kleen <ak@suse.de>
Cc: discuss@x86-64.org, linux-kernel@vger.kernel.org,
	marcelo.tosatti@cyclades.com, vandrove@vc.cvut.cz
Subject: Re: [PATCH] [CAN-2004-1144] Fix int 0x80 hole in 2.4 x86-64 linux kernels
Date: Wed, 22 Dec 2004 19:47:42 +0100	[thread overview]
Message-ID: <20041222184742.GN17946@alpha.home.local> (raw)
In-Reply-To: <20041222182313.GB3363@wotan.suse.de>

On Wed, Dec 22, 2004 at 07:23:13PM +0100, Andi Kleen wrote:
> > (...)
> > >  	sti
> > > +	movl %eax,%eax	
> > >  	pushq %rax
> > 
> > Although I don't know about x86_64 assembly, I know x86 and I wonder
> > how this patch would do anything. I would personnaly have written something
> > more like :
> 
> An 32bit write in long mode clears the upper 32bits of the register.

Ok, thanks for this quick precision, it wasn't obvious at first glance.

> See the x86-64 architecture manuals for more details.

Oh, I did a long time ago, when the athlon64 was only an emulator which ran
under linux, but I forgot all the details since then.

Thanks,
Willy


      reply	other threads:[~2004-12-22 18:47 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-12-22 17:58 [PATCH] [CAN-2004-1144] Fix int 0x80 hole in 2.4 x86-64 linux kernels Andi Kleen
2004-12-22 18:20 ` Willy Tarreau
2004-12-22 18:23   ` Andi Kleen
2004-12-22 18:47     ` Willy Tarreau [this message]

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