Re: [hatari-devel] Hatari Falcon Crossbar emulation segfault with EmuTOS

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On keskiviikko 06 kesäkuu 2012, Laurent Sallafranque wrote:
> In which case does hatari crash ?
> Have you got a demo that generates a crossbar crash ?
> (I don't remember having encountered one)

This is enough to get Hatari to crash:
$ hatari --tos etos512k.img  --machine falcon eko_syst.em/system.prg

("--fastfdc yes --fast-forward yes --bios-intercept --trace xbios"
gets you faster to the crash and you see what calls it does before it.)


Use e.g. the latest EmuTOS CVS version to which Vincent just posted
a link.


	- Eero

> Regards
> 
> Laurent
> 
> Le 06/06/2012 20:44, Eero Tamminen a écrit :
> > Hi,
> > 
> > On keskiviikko 06 kesäkuu 2012, Nicolas Pomarède wrote:
> >> Le 05/06/2012 22:35, Eero Tamminen a écrit :
> >>> Even if Hatari wouldn't crash, it may be emulating things wrong
> >>> because at least wrong dmaRecord.frameCounter value can scribble
> >>> all over Hatari's own memory, or over the emulated memory.
> >>> 
> >>> I guess invalid dmaPlay.frameCounter values just cause invalid
> >>> reads i.e. crashes without memory corruption and the evil stuff
> >>> that can follow from that.
> >> 
> >> Well, so far I'm unfortunately very busy, at least not with enough
> >> time to dig more precisely in the falcon sound part.The little spare
> >> time I have at the moment will be used to release next Hatari version
> >> (including any remaining bugs such as this one).
> >> 
> >> I'm afraid this will have to stay this way for now, unless someone
> >> else wants to give it a look before next release.
> > 
> > Ok, I'll add that as item to todo.txt.
> > 
> >> By the way, it could also be an error in emutos where sound addresses
> >> would not be set correctly.
> > 
> > EmuTOS is still lacking most of XBios functions that appeared
> > with TOS v4; everything for DSP, sound matrix etc.  That's
> > why things go wrong on the Atari side.
> > 
> > But the point is that regardless of how badly things go at Atari
> > side, Hatari itself shouldn't crash when Atari registers have
> > bogus values.
> > 
> > 	- Eero