From mint-bounce@lists.fishpool.fi  Thu Aug 11 13:24:27 2005
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Date: Thu, 11 Aug 2005 13:22:29 +0200
From: mikro <mikro@hysteria.sk>
To: "Konrad M. Kokoszkiewicz" <draco@obta.uw.edu.pl>
Cc: Andreas Schwab <schwab@suse.de>, Mint list <mint@fishpool.com>
Subject: Re: [MiNT] what's wrong with this code?
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> Not really. I don't know if you use traps in the code (didn't pay
> attention to the thread),
look at the first message - I posted complete source code

> but if you do it anywhere, and your user code
> clobbers the stack pointer, and fails to restore it before you do a trap,
> you'll get bus errors, because MiNT needs to copy trap arguments from the
> user stack (where they are) to the supervisor stack (where they should
> be). So the user sp has to point to the memory area the program owns.
> 
of course. I switch to user mode. save a7. do the things with a7. restore
a7. call trap. nothing else. I did a several experiments but with no
success. That's the reason I ask here, it's really strange.

-- 

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MiKRO         Atari XE/XL/Mega STE/Falcon060         http://mikro.atari.org
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