Hi Larry,
On Thu, Oct 4, 2012 at 7:15 AM, Larry Baker <ba...@usgs.gov> wrote:
> On Oct 3, 2012, at 10:00 PM, Geert Uytterhoeven wrote:
>
>>> I'm still looking for the conditions it takes to have something like
>>> show_registers() in arch/m68k/kernel/traps.c called when the trap occurs.
>>
>> The registers are only printed for exceptions caused in kernel mode.
>
> Is this a difference between uClinux and Linux?
>
> I have worked on bugs in IBM's J9 JVM on ARM Linux (MontaVista 2.4 kernel)
> which resulted in register and stack dumps of user code (the JVM) to the
> console and /var/log/messages for access violations (illegal instruction
> fetch). Like you say, I originally thought those must have been kernel
> traps. But, they were not followed by an Oops. I tracked down the kernel
> code that was printing the messages and convinced myself that the fault was
> actually occurring in user mode, not kernel mode -- which made much more
> sense for a JVM.
Typically, you do not want to spam the kernel log for exceptions in user mode,
as this may allow a DoS attack.
It may be useful for debugging, though.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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