Re: kgdb support in vanilla 2.6.2
From: George Anzinger (george_at_mvista.com)
Date: 03/04/04
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Date: Wed, 03 Mar 2004 16:42:17 -0800 To: "Amit S. Kale" <amitkale@emsyssoft.com>
Amit S. Kale wrote:
> On Wednesday 03 Mar 2004 5:22 am, George Anzinger wrote:
>
>>Andrew Morton wrote:
>>
>>>George Anzinger <george@mvista.com> wrote:
>>>
>>>>Often it is not clear just why we are in the stub, given that
>>>>we trap such things as kernel page faults, NMI watchdog, BUG macros and
>>>>such.
>>>
>>>Yes, that can be confusing. A little printk on the console prior to
>>>entering the debugger would be nice.
>>
>>That assumes that one can do a printk and not run into a lock. Far better
>>IMNSHO is to provide a simple way to get it from gdb. One can then even
>>provide a gdb macro to print the relevant source line and its surrounds. I
>>my lighter moments I call this the comefrom macro :) In my kgdb it would
>>look like:
>>
>>l * kgdb_info.called_from
>
>
> How about echoing "Waiting for gdb connection" stright into the serial line
> without any encoding? Since gdb won't be connected to the other end, and many
> a times a minicom could be running at the other end, it'll give a user an
> indication of kgdb being ready.
Uh, different solution for a different problem. The above command to gdb causes
the source code around the location "kgdb_info.called_from" to be displayed. In
the -mm version, this is location is filled in by kgdb with the return address
for the "kgdb_handle_exception()". This allows you to see just why you are in kgdb.
-- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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