Re: [PATCH 1/2] Fast tracepoint for powerpc64le

["Ulrich Weigand" <uweigand at de dot ibm dot com>]

Pedro Alves wrote:
> On 03/18/2015 11:04 AM, Ulrich Weigand wrote:
> > gdbserver would access function descriptors only for the
> > __nptl_create_event etc. routines.  These are looked up
> > only after a libthread_db td_ta_new_p call succeeds, which
> > should only be true if libpthread has been loaded (and
> > relocated) in the inferior.  If it hasn't been yet at the
> > time gdbserver attaches, the whole thread initialization
> > sequence is defered until after the new_objfile event that
> > happens after libpthread *was* loaded and relocated.
> > Am I missing something here?
> 
> You're missing the case of statically linked threaded
> programs.  AFAICS, on x86-64, libthread_db.so is loaded
> successfully on initial connection, and if I hack gdbserver
> to use __nptl_create_event events, I see it setting the
> breakpoint already on initial connection.

Hmm, I would have thought that in a statically linked
executable, function descriptors would need no relocation.
However, I guess that isn't true when using PIE ...

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU/Linux compilers and toolchain
  Ulrich.Weigand@de.ibm.com