Re: [hatari-devel] Hatari freeze on XaAES quit with 030 MMU + FPU + cache emulation

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 24.7.2022 21.12, Nicolas Pomarède wrote:
> Le 10/07/2022 à 12:11, Eero Tamminen a écrit :
> > Here are slightly corrected / updated repro instructions, with latest 
> > MiNT snapshot, as older snapshot is not available any more.
>
> I don't have time at the moment to check all this, but can you try this 
> in cpu/newcpu.c :
>
>   - change "#define VALIDATE_68030_DATACACHE 0" to "1" instead
>
>   - around line 9853, uncomment this "//#define 
> WINUAE_FOR_HATARI_DEBUG_CACHE"
>
> this will check that each time a data is read from cache, then the 
> content in RAM is the same ; if some mismatches are reported, it means 
> there's sthg buggy in the cache code.
>
> Then run your case again and see if any cache messages are displayed 
> when things go wrong.

With above 2 lines changed (or just the first one), EmuTOS v1.1.1 does 
not even boot.

Just having 030 CPU is then enough for EmuTOS boot to end in:
-------------------------------------
<EmuTOS boot screen>
....
Panic: Bus Error
fw=b008 ir=0000 ssr=0341
addr=0000059c sr=0300 pc=00e64b7a

D0-3: 00000000 00000000 00000000 00000000
D4-7: 00000000 00000000 00000000 00000000
A0-3: 00000000 00000000 00000000 00000000
A4-7: 00000000 003da6f8 003da6c6 00007e08
 USP: 003da6f8

basepage=00014970
text=00e64b78 data=00000000 bss=00000000
-------------------------------------

I.e. I do not need to enable even MMU or FPU.

Even when 030 cache emulation is disabled with "--cpu-exact off", it 
still crashes!

Same issue with EmuTOS v1.2 Git version.

TOS 3.06 dies to double bus error on:
WARN : Bus Error reading at address $68, PC=$e013ae addr_e3=e013ae 
op_e3=42a7

TOS 4.04 dies to double bus error on:
WARN : Bus Error reading at address $59c, PC=$e01174 addr_e3=e01174 
op_e3=42a7

Only TOS v2.06 on 030 ST, boots up fine with that change.


=> That validation code in Hatari seems broken, as instead of validating 
emulation, it changes how things are emulated.


	- Eero

PS. I tried also doing clean build, Debug build instead of 
RelWithDebInfo, and build with small mem option disabled, but those did 
not change anything.