Re: New debug kernel installation mechanism committed to HEAD
On Thursday, 21 October 2004 at 9:59:36 +0200, Jeroen Ruigrok/asmodai wrote:
> -On [20041021 09:32], Matthew Dillon (dillon@apollo.backplane.com) wrote:
>> Theoretically that should work but I've never tried it. It would be
>> nice if it could be automated. I do not know if the FreeBSD guys have
>> made any progress integrating modules into the debugger.
Sorry for coming into this discussion so late (and possibly not
sending this message for some days, when I next get net access).
Yes, the FreeBSD guys (not me) have made considerable progress with
loading kernel symbols, though at the moment (since the introduction
of gdb 6.x) things are a bit of a jumble. In many cases it's possible
for the symbols to load automatically without user intervention; I
think this is the case for those lucky enough to be able to get a
processor dump (currently 'panic' in ddb doesn't work; use 'call
doadump' to get a dump).
> Check Greg's various gdb setup files:
>
> /usr/src/sys/dev/raid/vinum/.gdbinit*
This is a little out of date. Now more generic scripts are in
/usr/src/tools/debugscripts. You should be able to go to the kernel
build directory (typically something like /usr/obj/usr/src/GENERIC)
and write:
# make gdbinit
# gdb -k kernel.debug /var/crash/vmcore.1
The 'make gdbinit' creates .gdbinit files customized to the processor
architecture. There's a lot more about this in my tutorial in
Karlsruhe on Friday. After that, I'll release the course notes
(hopefully with corrections).
Greg
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