Date: Fri, 7 Nov 1997 12:40:55 -0700 (MST) From: Jon Trulson <jon@XiG.com> To: Julian Elischer <julian@whistle.com> Cc: hackers@FreeBSD.ORG Subject: Re: Newest Pentium bug (fatal) Message-ID: <Pine.BSD.3.92.971107124007.5022J-100000@landru.xig.com> In-Reply-To: <3463605C.41C67EA6@whistle.com>
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On Fri, 7 Nov 1997, Julian Elischer wrote:
> Date: Fri, 07 Nov 1997 10:39:24 -0800
> From: Julian Elischer <julian@whistle.com>
> To: hackers@FreeBSD.ORG
> Subject: Newest Pentium bug (fatal)
>
> On a "genuine Intel" pentium (not pentium pro)
> execution of the following sequence, 0xf0 0x0f 0xc7 0xc8
>
> will stop the processor. This is doable from user mode and in
> 16bitmode, or in fact any mode.
>
> try the following c program.
>
> unsigned char x[] = { 0xfo, 0x0f, 0xc7, 0xc8 };
>
>
> main ()
> {
> void (*f)(void) = x;
> f();
> }
>
Ouch. Kills every p5 (in user mode no-less) I've tried it on...
--
Jon Trulson work: mailto:jon@xig.com, home: mailto:jon@radscan.com
Xi Graphics, http://www.xig.com
ID: 1A9A2B09, FP: C23F328A721264E7 B6188192EC733962
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