Re: Strange 80x86 OPCODE

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Article #176

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#176

From: aki
Date: Sat, 01 Aug 1992 18:07

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Ok.  It's time to reveal the real purpose of the 0F 3D as I have
determined it last night.  The 3D of the op-codes is just a
<expletive deleted> place holder for self-modifying code.  To top
it all off,  the modification is done far far far away to make sure
I wouldn't notice it.  Anyway,  the program traps exceptions, runs
0F 3D,  0F A6  and at least a few other op-codes to identify the 
step-level of a 386/486.

Please note,  that 0F 3D could still have some unknown function,
however in this particular instance its only purpose seems to be
to make sure exceptions are working ok.

Aki.
-- 
/  Phone: 408-662 9664   Fax: 662 9676  |  "Aki" pronounced: Ah-Key. I know  \ 
\  125 Searidge Ct #D, Aptos, CA 95003  |  what I'm doing most of the time.  /

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Path: arc1-ca.pugleaf.net!sparky!uunet!olivea!hal.com!decwrl!csus.edu!netcomsv!cruzio!aki
From: aki@cruzio.santa-cruz.ca.us
Newsgroups: comp.os.msdos.programmer
Subject: Re: Strange 80x86 OPCODE
Keywords: 80x86 Assembler Fun
Message-ID: <3983@cruzio.santa-cruz.ca.us>
Date: 1 Aug 92 18:07:52 GMT
References: <3947@cruzio.santa-cruz.ca.us> <Bs7t7n.G28@ireq.hydro.qc.ca>
Sender: aki@cruzio.santa-cruz.ca.us
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