Re: Troubleshooting broken gdbserver/remote-target

[Grant Edwards <grant dot b dot edwards at gmail dot com>]

On 2009-06-23, Paul Pluzhnikov <ppluzhnikov@google.com> wrote:

>> What would cause gdb to miss out on the fact that
>> /lib/libuClibc-0.9.30.1.so is mapped?
>>
>> Where does gdb get mapping info?
>
> I believe the code GDB should be using on Linux is in solib-svr4.c
>
> Gdb looks for _r_debug symbol and DT_DEBUG Elf32_Dyn entry to
> find the 'struct r_debug', which contains a linked list of
> loaded shared libraries, and traverses that list.

Thanks for the hint.  When I have a chance I'll see if I can
figure out what's wrong.  I presume gdb is looking for those
symbols in the ELF executable file?

> My guess: either GDB is not finding _r_debug, or (more likely)
> is not traversing the list correctly.

I found other reports that 6.8 doesn't work for ARM targets,
but 6.7.1 does.  I switched from 6.8 to 6.7.1, and that fixed
the problem.

Now to see if that fixed the problems with thread support
as well...

-- 
Grant Edwards                   grante             Yow! I know things about
                                  at               TROY DONAHUE that can't
                               visi.com            even be PRINTED!!