Re: [hatari-devel] Pure debugger, illegal opcodes, exceptions

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Again, With moonspeeder, it's the Illegal.l (seen in the traces) that 
generates the PC jumps to $10
(Maybe it's not related to the bug you've found, but it seems at first 
glance)

Maybe a closer look to this instruction would help.

Regards

Laurent


Le 09/10/2012 21:41, Uwe Seimet a écrit :
> Hi,
>
> > The trace reminds me the trace I get with moonspeeder (an exception2,
> > then the M68000 bus error readind at adress $10)
> >
> > Maybe something wrong in the 68030 emulation core
> Some debuggers change the value in $10 in order to support breakpoints.
> When looking at the debug output I got it's a combination of a bus error
> with an illegal opcode:
>
> > > M68000 Bus Error reading at address $10.
> > > Illegal instruction: 4afc at 000A3D12 -> 00000000
> > > Exception 2 (0) at a9616 -> a95da!
> > > M68000 Bus Error reading at address $10.
> It's not any illegal opcode but the ILLEGAL instruction, so it might
> have something to do with the way PD sets up the exception vectors. Or
> with the exception stackframes. I remember Thomas mentioning something
> about exception stackframes recently.
>
> Take care
>
> Uwe