Path: utzoo!utgpu!water!watmath!clyde!rutgers!ames!elroy!devvax!jackm
From: jackm@devvax.JPL.NASA.GOV (Jack Morrison)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Looking for 286 protected mode debugger
Message-ID: <1265@devvax.JPL.NASA.GOV>
Date: 9 Feb 88 17:18:07 GMT
References: <125@smc1.UUCP> <700@esunix.UUCP>
Reply-To: jackm@devvax.JPL.NASA.GOV (Jack Morrison)
Organization: Jet Propulsion Laboratory, Pasadena, CA.
Lines: 20

In article <700@esunix.UUCP> sedwards@esunix.UUCP (Scott Edwards) writes:
>in article <125@smc1.UUCP>, hendel@smc1.UUCP (Ariel Hendel) says:
>> Does anyone know of a debugger suitable for the 80286 protected mode?
>> 
>
>I an under the impression that doing a protected mode '286 software debugger
>is impossible because of the protection.  I think Intel made a special

Not true. I've written a debugger with disassembler for protected 286. It
has to run at maximum privilege level, and has to play games to access
arbitrary memory, but it can be done. In fact, it ran in a multitasking
OS that we wrote, and included breakpoints and single-stepping using the
appropriate software interrupts. 

The code is the property of my former employer, however...

-- 
Jack C. Morrison	Jet Propulsion Laboratory
(818)354-1431		jackm@jpl-devvax.jpl.nasa.gov
"The paycheck is part government property, but the opinions are all mine."