Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!spool.mu.edu!munnari.oz.au!comp.vuw.ac.nz!jwright
From: Julian.Wright@comp.vuw.ac.nz (John Julian Wright)
Newsgroups: comp.sys.acorn
Subject: Re: ErrorV Problems
Message-ID: <1991Apr07.095810.21467@comp.vuw.ac.nz>
Date: 7 Apr 91 09:58:10 GMT
Article-I.D.: comp.1991Apr07.095810.21467
References: <1991Apr4.215956.735@hotb.radig.de>
Sender: news@comp.vuw.ac.nz (News Admin)
Organization: Computer Science, Victoria University, Wellington, NewZealand
Lines: 36
Nntp-Posting-Host: moa-pt.comp.vuw.ac.nz
Originator: jwright@moa-pt.comp.vuw.ac.nz


In article <1991Apr4.215956.735@hotb.radig.de>, gunnar@hotb.radig.de
(Gunnar Zoetl) writes:
|> 
|> I have a  little problem  with the following  code fragment...
|>                                             ...If I use it from
|> within
|> the basic environment with *-commands, all works well, but it does
|> not
|> work within the supervisor mode. I suppose that  the cli  does not
|> use
|> the OS_GenerateError system call, or is there a fault in the code?
|> 
|> Here is the relevant part:
|> 
|> .add
|>    STMFD R13!,{R0-R2,R14}
            ^^^

You are allocating yourself some stack, I hope...

This sounds very similar to a problem I encountered when writing an
absolute code application (ok a Demo)... in that contrary to what you might
expect, absolute applications which are *Run from the supervisor do *not*
have R13 set up for them automatically. The application has to specifically
find out how big the application space is and assign R13 as appropriate.

If you CALL the code from BASIC, however, R13 will have been set up with a
suitable value already.

    Cheers, Julian.
-- 
;`````````````````````````````````````````````````````````````````````````````;
; I would if I could but I can't so I won't but I might if I find I can later ;
;,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,;
jwright@comp.vuw.ac.nz                                julian@sideways.gen.ac.nz