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From: rpw3@amdcad.AMD.COM (rpw3)
Newsgroups: comp.arch
Subject: Re: Arithmetic Traps in 29000
Message-ID: <19193@amdcad.AMD.COM>
Date: Thu, 19-Nov-87 01:24:26 EST
Article-I.D.: amdcad.19193
Posted: Thu Nov 19 01:24:26 1987
Date-Received: Sat, 21-Nov-87 12:06:12 EST
References: <1656@geac.UUCP> <863@winchester.UUCP>
Reply-To: rpw3@amdcad.UUCP ()
Organization: [Consultant] San Mateo, CA
Lines: 18

In article <490@neptune.AMD.COM> brian@neptune.AMD.COM (Brian McMinn) writes:
+---------------
| Using these instructions, the user can specify the proper form of overflow
| checking on an operation by operation basis (even finer granularity than
| having a user register keep track of whether to trap on Overflow or Carry).
+---------------

And at the risk of belaboring the point, it only costs 7 instructions of
kernel "trampoline code" to hand a trap back to a user-mode handler.
So the language run-times can do whatever they want with the exception.


Rob Warnock
Systems Architecture Consultant

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