how to gdb genode apps

[stephane frenot]

Actually, it is not really working.

Everything works find, until I attach gdb to the process.

I am stucked to this:

(gdb) info thread
* 1 process 2370  pseudo_end ()
    at
/opt/genode/genode-r121/base-linux/../base-linux/src/platform/x86_64/lx_syscall.S:29

(gdb) info stack
#0  pseudo_end ()
    at
/opt/genode/genode-r121/base-linux/../base-linux/src/platform/x86_64/lx_syscall.S:29
#1  0x0000000001021442 in lx_nanosleep (this=0x103c400)
    at /opt/genode/genode-r121/base-linux/src/platform/linux_syscalls.h:371
#2  thread_stop_myself (this=0x103c400)
    at /opt/genode/genode-r121/base-linux/src/base/lock/lock_helper.h:70
#3  Genode::Cancelable_lock::lock (this=0x103c400)
    at /opt/genode/genode-r121/base/src/base/lock/lock.cc:137
#4  0x000000000101022e in Genode::Lock::lock (this=<value optimized out>)
    at /opt/genode/genode-r121/base/include/base/lock.h:35
#5  Genode::Platform::wait_for_exit (this=<value optimized out>)
    at /opt/genode/genode-r121/base-linux/src/core/platform.cc:50
#6  0x000000000100dfde in main ()
    at /opt/genode/genode-r121/base/src/core/main.cc:229

And I am not able to reach the line where I put "the wait_for_continue"
instruction.

/stephane
On Fri, Sep 10, 2010 at 6:09 PM, Sebastian Sumpf <
Sebastian.Sumpf at ...1...> wrote:

>  Hello again,
>
> here is a small HOWTO for debugging Genode apps on Linux:
>
> * The first thing to do is to interrupt Genode at a certain point as you
> cannot start core with gdb. So, if you want to debug an application you
> have to call 'wait_for_continue' from within your code.
>    Somewhere in your code write something like:
>
>    extern "C" void wait_for_continue();
>
>    void some_func_in_your_program()
>   {
>       wait_for_continue();
>   }
>
>    This will cause your program to stall in the function above.
>
> * Compile your app
> * Start './core' from the command line
> * As mentioned before your program will stop in the 'wait_for_continue'
> function
> * Now find out the process id of your program, ('ps -efL | grep Genode')
> * Start gdb with 'gdb -p <Process ID from ps>' , this will attach gdb to
> the process
> * Switch to the Genode output console (where you started core) and hit
> 'enter', this will cause your program to leave the 'wait_for_continue'
> function
> * Switch back to GDB, you now may step and set breakpoints (note: Does
> not work with all gdb versions), inspect variables, ... .
>
> I hope this helps,
>
> Sebastian
>
> On 09/10/2010 05:34 PM, stephane frenot wrote:
> > Hello,
> > I have a problem while debugging genode with gdb.
> >
> > When starting gdb ./core it freeezes on 3 LWP.
> >
> > Is there a specific gdb configuration in order to reach sub services ?
> >
> > /stephane
> > --
> > http://perso.citi.insa-lyon.fr/sfrenot
> > work here : http://tinyurl.com/2ts4xf
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> > ---
> > Stephane Frenot
> > Université de Lyon, INRIA
> > INSA-Lyon, CITI, F-69621, France
> >
> >
> >
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>
>
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-- 
http://perso.citi.insa-lyon.fr/sfrenot
work here : http://tinyurl.com/2ts4xf
sleep here : http://tinyurl.com/33p2gt
play here : http://tinyurl.com/3yarjz
---
Stephane Frenot
Université de Lyon, INRIA
INSA-Lyon, CITI, F-69621, France
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