Xen devel - Nov 2007 - Can I use pdb now?

Hi all.
#please, forgive my lack of words :-)

I want to debug xen kernel(!= dom0 or domU) with gdb through pdb.
but I''ve found removing pdb from
codebase(http://xenbits.xensource.com/xen-3.1-testing.hg?rev/80388aea02a1).

There is still means to use pdb or alternate tool?

regars.

**************************************** 
HPCS lab
4th grade student of Colledge of Information Science, University of Tsukuba

Ryo Kanbayashi


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> #please, forgive my lack of words :-)
>
> I want to debug xen kernel(!= dom0 or domU) with gdb through pdb.
> but I''ve found removing pdb from
> codebase(http://xenbits.xensource.com/xen-3.1-testing.hg?rev/80388aea02a1).
>
> There is still means to use pdb or alternate tool?
As far as I know pdb is abandoned.

There is a Xen gdb stub in the hypervisor under xen/common/gdbstub.c (there 
are also arch-specific parts).  You''ll need another machine and a null
modem
cable in order to debug Xen.

You need to build Xen with "make crash_debug=y" in order to build in
support
for this.  If you have an existing Xen tree you should probably do "make 
clean" first, to get rid of any stale modules.

Cheers,
Mark


-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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thanks mark :-)

Mark Williamson wrote:
>> #please, forgive my lack of words :-)
>>
>> I want to debug xen kernel(!= dom0 or domU) with gdb through pdb.
>> but I''ve found removing pdb from
>>
codebase(http://xenbits.xensource.com/xen-3.1-testing.hg?rev/80388aea02a1).
>> There is still means to use pdb or alternate tool?
>>     
>
> As far as I know pdb is abandoned.
>
> There is a Xen gdb stub in the hypervisor under xen/common/gdbstub.c (there
> are also arch-specific parts).  You''ll need another machine and a
null modem
> cable in order to debug Xen.
>
> You need to build Xen with "make crash_debug=y" in order to build
in support
> for this.  If you have an existing Xen tree you should probably do
"make
> clean" first, to get rid of any stale modules.
>
> Cheers,
> Mark
>   
I tried to use gdb stub as you say.
But in serial console like below
> (XEN) ''h'' pressed -> showing installed handlers
> (XEN)  key ''%'' (ascii ''25'') => Trap
to xendbg
> (XEN)  key ''C'' (ascii ''43'') =>
trigger a crashdump
> (XEN)  key ''H'' (ascii ''48'') => dump
heap info
> (XEN)  key ''N'' (ascii ''4e'') => NMI
statistics
> (XEN)  key ''R'' (ascii ''52'') =>
reboot machine
> (XEN)  key ''a'' (ascii ''61'') => dump
timer queues
> (XEN)  key ''d'' (ascii ''64'') => dump
registers
> (XEN)  key ''h'' (ascii ''68'') => show
this message
> (XEN)  key ''i'' (ascii ''69'') => dump
interrupt bindings
> (XEN)  key ''m'' (ascii ''6d'') =>
memory info
> (XEN)  key ''n'' (ascii ''6e'') =>
trigger an NMI
> (XEN)  key ''q'' (ascii ''71'') => dump
domain (and guest debug) info
> (XEN)  key ''r'' (ascii ''72'') => dump
run queues
> (XEN)  key ''t'' (ascii ''74'') =>
display multi-cpu clock info
> (XEN)  key ''u'' (ascii ''75'') => dump
numa info
> (XEN)  key ''z'' (ascii ''7a'') => print
ioapic info
I hit % key but there were no response.
Why?

****************************************
HPCS lab
4th grade student of Colledge of Information Science, University of Tsukuba

Ryo Kanbayashi



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