Re: [hatari-devel] TT emulation crashes when there is no ACSI drive |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] TT emulation crashes when there is no ACSI drive
- From: Christian Zietz <czietz@xxxxxxx>
- Date: Sun, 11 Aug 2019 15:07:55 +0200
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Uwe Seimet schrieb:
> Sounds quite tricky. Why doesn't this also happen on real Atari hardware?
> I'd assume that there could also be an MFP interrupt at a critical
> moment.
Yes, but there you don't have the Hatari cartridge code using additional
stack space. I suppose those few words make the difference between
working and crashing.
Just to illustrate how tight this is: At the call to Pexec(7) in
load_n_reloc [1], the stack pointer is at $01E7BA. The basepage of the
GEMDOS process is at $01E700, so that the register save area extends up
to $01E77F; meaning there are only 58 bytes of stack left before the
register save area is corrupted.
Regards
Christian
[1] <https://git.tuxfamily.org/hatari/hatari.git/tree/src/cart_asm.s#n198>
--
Christian Zietz - CHZ-Soft - czietz@xxxxxxx
WWW: http://www.chzsoft.de/
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