Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!purdue!ames!pacbell!att!mcdchg!behemoth!mph
From: mph@behemoth.phx.mcd.mot.com (Mark Huth)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Use of SuperState() call
Message-ID: <11022@behemoth.phx.mcd.mot.com>
Date: 6 Jun 89 23:36:55 GMT
References: <8906010307.AA11892@jade.berkeley.edu>
Reply-To: mph@behemoth.UUCP (Mark Huth)
Organization: Motorola Microcomputer Division, Tempe, Az.
Lines: 14

In article <8906010307.AA11892@jade.berkeley.edu> 451061@UOTTAWA.BITNET (Valentin Pepelea) writes:
>
>The SuperState() & UserState() combo does not work. Use Supervisor() instead:
>
Thanks to Dave and Valentin for replies.  Specifically, the UserState call does
not work.  It dummies up a stack frame by using the same code that SuperState
uses.  However, SuperState, in the instance in question, would return with
an RTE, UserState returns by poping the SR and then doing an RTS - leaving the
dummied format/vector word on the stack for the next rts to stumble over.

Nice Job. 8-)   Actually, both routines are needlessly complex.  I stepped
through them with the ROM-wack this weekend.

Mark Huth