Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!usc!srhqla!demott!kdq
From: kdq@demott.COM (Kevin D. Quitt)
Newsgroups: comp.sys.m68k
Subject: Re: mc68040 I/D coherency
Message-ID: <265@demott.COM>
Date: 1 Jun 90 18:10:50 GMT
References: <765@ssp11.idca.tds.philips.nl>
Reply-To: kdq@demott.COM (Kevin D. Quitt)
Organization: DeMott Electronics Co., Van Nuys CA
Lines: 21

In article <765@ssp11.idca.tds.philips.nl> dolf@idca.tds.PHILIPS.nl (Dolf Grunbauer) writes:
...
>No you don't want it to make it impossible under *any* circumstances. How
>about your favorite run-time debugger like 'sdb' or 'adb' or whatever debugger
>you are using ? If you put a breakpoint somewhere in the code, the instruction
>is replaced by a special trap or someting alike. This is self modifying code.

    It should be impossible for any user-level code.  Priveleged code like
a debugger must be smart enough to invalidate the cache, and that has nothing
to do with I vs D.


-- 

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Kevin D. Quitt         Manager, Software Development    34 12 N  118 27 W
DeMott Electronics Co. 14707 Keswick St.   Van Nuys, CA 91405-1266
VOICE (818) 988-4975   FAX (818) 997-1190  
MODEM (818) 997-4496 Telebit PEP last      demott!kdq   kdq@demott.com

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