[Barrelfish-users] Debugging symbols

Patrik Eklöf peklof at kth.se
Mon Jun 4 13:45:28 CEST 2012


Well, I haven't been able to fully get symbolic debugging to work, so I can't say specifics I am missing which I need, but I have noticed some symbols missing, so I am going to use them as an example.

At address 0x00000000004028d1, /source/usr/netd/idc_barrelfish.c seems to be loaded (so /sbin/netd then).
The very first assembly instruction I see is call 0x46d270, which jumps into some unknown location.

[cpu0] cs:0x000000000046d270 p:0x0005be6270  push rbp
interdisp_ump_send_handler () in interdisp_flounder_bindings.c
simics> whereis -d 0x000000000046d270
Address 0x46d270 is not in any known location.

At this point, it seems to mess up. It LOOKS like some information is missing, but I can't be sure, so I figured I'd ask.
I can't see any source for this location and I seem to be unable to get any information about what source file and line it's associated with.
At this point, symbolic debugging just breaks down. It stops working correctly.

I haven't yet tried gdb, however (have not been able to get it to read symbols from the binaries; it complains it can't read them).
This is sort of a little game where I have to find out if the culprit is the simulator or the OS.
So this may be a little premature, and if so, I apologize.

Regards,
Patrik Eklöf
Student at ICT, Master of Science in Engineering Education, IT Programme, KTH, Kista

________________________________________
From: Kornilios Kourtis [kornilios.kourtis at inf.ethz.ch]
Sent: Monday, June 04, 2012 13:03
To: Patrik Eklöf
Cc: barrelfish-users at lists.inf.ethz.ch
Subject: Re: [Barrelfish-users] Debugging symbols

Hi Patrik,

On Mon, Jun 04, 2012 at 08:29:08AM +0000, Patrik Eklöf wrote:
> Hi all,
>
> I am trying to get debugging symbols for entire Barrelfish in order to
> debug in more easily.  I managed to load symbols from all the
> executables in /sbin, but it doesn't seem to be all of them. Some are
> missing, such as the libraries (reent is one of them, I think).  So my
> questions are as follows: Do I have to do something more in order to
> produce debugging symbols for all the source code than just compiling
> Barrelfish with the default settings?  What other files, if any, should
> I load symbols from, other than /sbin in order to get all the debugging
> symbols for the entire BF?

Since in barrelfish libraries are not dynamically loaded, all debugging
symbols should be in the binaries themselves. What are the symbols you
seem to be missing?

cheers,
Kornilios.


--
Kornilios Kourtis



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