From mint-bounce@lists.fishpool.fi  Fri Dec 18 06:08:50 2009
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Message-ID: <4B2B616B.4040707@freesbee.fr>
Date: Fri, 18 Dec 2009 12:03:07 +0100
From: =?ISO-8859-15?Q?Vincent_Rivi=E8re?= <vincent.riviere@freesbee.fr>
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To: "mint@lists.fishpool.fi" <mint@lists.fishpool.fi>
Subject: Re: [MiNT] Missing clobbered register in gemlib
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Helmut Karlowski a écrit :
> Restore-Palette works with the actual gemlib16! So many fvdi-related 
> issues may be working now too. I'll check this later.
> 
> Cheers to Mr. Riviera! :)

I'm not aware of the Restore-Palette problem, but if it involves AES 
calls, especially AES functions potentially returning values through 
pointers passed in arguments, the clobbered register bug is certainly in 
cause. That bug was very dangerous, because some AES calls didn't return 
the right results, an the memory was randomly trashed.

This bug has been found when testing SDL programs with the GEM driver 
for ColdFire. Don't forget to thank Patrice Mandin and Didier Méquignon 
for tracking down this bug.

Note: Now this bug is fixed, Doom for GEM works on my ColdFire 
evaluation board at 25 FPS :-)
It should work on the ACP prototype, too, when we have a good VDI 
driver. Currently we have only the EmuTOS VDI, and we have not tested yet.

-- 
Vincent Rivière