Building Genode for Gumstix Overo platform

Stefan Kalkowski stefan.kalkowski at ...1...
Thu Feb 16 16:27:20 CET 2012

On 16.02.2012 16:20, Michael Grunditz wrote:
> On 02/16/2012 03:55 PM, Michael Grunditz wrote:
>> On 02/16/2012 02:27 PM, Stefan Kalkowski wrote:
>>> Hi Michael,
>>> On 16.02.2012 14:07, Michael Grunditz wrote:
>>>> Hi
>>>> I am also porting Genode to a new ARM board. Right now I am stuck with libc. It just halts with abort() as soon as it initiates. I cannot use GDB at this stage. Is there any other way of debuging this ? Adding prints to libc doesnt work since this problem is when libc init starts.
>>> that sounds like you're getting an exception at that point.
>>  I guessed that
>>> If you're using the Fiasco.OC kernel together with Genode you can of
>>> course use it's included kernel-debugger, which is quiet feature-rich.
>>> You can invoke it by hand via the serial line by pressing escape, or you
>>> put a 'enter_kdebug("WAIT")' snippet at appropriate places of your code
>>> resp. libc initialization. Therefore you've to include the following before:
>>>   namespace Fiasco {
>>>   #include <l4/sys/kdebug.h>
>>>   }
>>> I fear the kernel-debugger's usage isn't that self-explanatory, but you
>>> can start playing around after looking at the help-screen via '?'.
>>> Something often useful is dumping the stacktrace of a thread via 'bt'.
>>> To get meaningful symbols instead of plain addresses there is a small
>>> tool in 'base-foc/contrib/kernel/fiasco/tool/backtrace'.
>> Just so I understand this : backtrace is used like , cat bt.txt |
>> ./backtrace /path/to/bin ?
>> I am a little bit confused over which binary I should compare to , i.e.
>> I don't get any match.
> Ok so I got matches in the kernel. Thanks , at least it gives me a hint
> on where to start looking.

Sorry, I've missed you're debugging libc, which is a shared library, so
its not in the binary anyway and backtrace won't work out of the box. I
fear you've to do some steps manually: looking in which part (binary,
ldso, libc, ...) the addresses from the stack lying in and using the
offsets from their linking start-addresses to find the appropriate spot
in the code.


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Stefan Kalkowski
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