From: Denis Vlasenko <vda@ilport.com.ua>
To: <cutaway@bellsouth.net>, <linux-kernel@vger.kernel.org>
Subject: Re: 387 emulator hack - mutant AAD trick - any objections?
Date: Fri, 27 May 2005 12:35:41 +0300 [thread overview]
Message-ID: <200505271235.41353.vda@ilport.com.ua> (raw)
In-Reply-To: <007001c56290$25dd4d00$2800000a@pc365dualp2>
On Friday 27 May 2005 10:44, cutaway@bellsouth.net wrote:
> Brain fade...example should be:
>
> 1) Start with AX = 0x0023
> 2) Execute AAM instruction
> 3) Now AX = 0x0305 (unpacked BCD)
> 4) Execute base 16 AAD instruction
> 5) Now AX = 0x0035 (packed BCD)
Intel syntax:
shl ah,4
or al,ah
mov ah,0 (if needed)
No need to use AAD16, it is
a) doesnt work on some obscure ancient NEC x86 clones IIRC
b) is microcoded (slow)
--
vda
next prev parent reply other threads:[~2005-05-27 9:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-27 7:44 cutaway
2005-05-27 9:35 ` Denis Vlasenko [this message]
2005-05-27 11:43 ` cutaway
2005-05-27 12:24 ` Maciej W. Rozycki
2005-05-27 13:47 ` cutaway
-- strict thread matches above, loose matches on Subject: below --
2005-05-27 7:11 cutaway
2005-05-27 7:25 ` Mikael Pettersson
2005-05-27 12:17 ` Maciej W. Rozycki
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