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To: Hans-Peter Jansen <hpj@urpla.net>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org
Subject: Re: [Q] Looking for an emulation for CMOV* instructions.
In-Reply-To: <E16Oocq-0005tX-00@the-village.bc.nu>
	<20020111195946.38C35142E@shrek.lisa.de>
From: Ronald Wahl <Ronald.Wahl@informatik.tu-chemnitz.de>
Date: 11 Jan 2002 21:05:17 +0100
In-Reply-To: <20020111195946.38C35142E@shrek.lisa.de>
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On Fri, 11 Jan 2002 20:59:45 +0100, Hans-Peter Jansen wrote:

> On Friday, 11. January 2002 00:28, Alan Cox wrote:
>> > is it possible to include an emulation for the CMOV* (and possible other
>> > i686 instructions) for processors that dont have these (k6, pentium
>> > etc.)? I think this should work like the fpu emulation. Even if its slow
>> 
>> The kernel isnt there to fix up the fact authors can't read. Its also very
>> hard to get emulations right. I grant that this wasn't helped by the fact
>> the gcc x86 folks also couldnt read the pentium pro manual correctly.

> But it shouldn't crash, if the wrong architecture is chosen. (Different
> problem, I know) Perfect solution would be emulate them all, but at least
> an simple error message (please eject CPU, and put in a XXX one) would be 
> sufficient, IMHO. 

A message occurs already: "Illegal instruction". But this is not
really a help.

ron

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