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From: brownc@utah-cs.UUCP (Eric C. Brown)
Newsgroups: net.lang.mod2
Subject: Re:  Exceptions in Modula-2
Message-ID: <3666@utah-cs.UUCP>
Date: Tue, 4-Feb-86 22:15:42 EST
Article-I.D.: utah-cs.3666
Posted: Tue Feb  4 22:15:42 1986
Date-Received: Thu, 6-Feb-86 21:06:24 EST
References: <8602031436.27242@ur-cayuga.rochester.arpa>
Reply-To: brownc@utah-cs.UUCP (Eric C. Brown)
Organization: University of Utah, Salt Lake City
Lines: 19

In article <8602031436.27242@ur-cayuga.rochester.arpa> jipping@UIOWA.CSNET (Mike Jipping) writes:
>Jeff -- via Eric Brown...
>   Maybe I'm just daft, but without an implementation, I fail to see how
>these "exception" definitions will work on *general* implementations of
>Modula-2.  

Well, the problem is that the IMPLEMENTATION of these modules are 
system-specific.  For example, on the PC, you basically need to save and 
restore CS, IP, BP, and SP.  Other registers may be necessary if your 
compiler caches constants in other registers.  On the 68K, you need A7, PC,
and whatever register your compiler uses for static links.

Personally, I do not find it very difficult to write a Setjmp/Longjmp
set of routines for a given processor, but these routines *must* be rewritten
for each processor.

Eric C. Brown
brownc@utah-cs.ARPA
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