https://bugs.kde.org/show_bug.cgi?id=434849
pedro...@linux.ibm.com changed:
What |Removed |Added
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CC| |pedro...@linux.ibm.com
--- Comment #3 from pedro...@linux.ibm.com ---
(In reply to Mark Wielaard from comment #2)
> This is done deliberately, see coregrind/m_initimg/initimg-linux.c
> (setup_client_stack):
>
> case AT_SYSINFO_EHDR: {
> /* Trash this, because we don't reproduce it */
> const NSegment* ehdrseg =
> VG_(am_find_nsegment)((Addr)auxv->u.a_ptr);
> vg_assert(ehdrseg);
> VG_(am_munmap_valgrind)(ehdrseg->start, ehdrseg->end -
> ehdrseg->start);
> auxv->a_type = AT_IGNORE;
> break;
> }
>
It seems that this case statement is #ifdefed out for ppc, and some other
arches, correct? So shouldn't AT_SYSINFO_EHDR, and the vDSO, be available for
these arches?
> Is there a reason you need AT_SYSINFO_EHDR?
It's used in glibc for ppc for the backtrace function that prints out return
addresses for all frames in a stack. The symbol from the vDSO for the signal
trampoline is used to handle the backtrace when there's a signal, which doesn't
work when it's run under Valgrind, due to the missing vDSO.
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