Re: [PATCH] [CAN-2004-1144] Fix int 0x80 hole in 2.4 x86-64 linux kernels

From: Andi Kleen
Date: Wed Dec 22 2004 - 13:27:00 EST

On Wed, Dec 22, 2004 at 07:20:48PM +0100, Willy Tarreau wrote:
> Hi Andi,
> On Wed, Dec 22, 2004 at 06:58:18PM +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.
See the x86-64 architecture manuals for more details.

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