[Bug backtrace/16155] Backtraces in threads don't work on AArch64

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=16155

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      from  0cb112f7400187275da81a05a9ad0534f1430139 (commit)

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6eeee81c8e59511962bdd83df5e7785bfdf871d2

commit 6eeee81c8e59511962bdd83df5e7785bfdf871d2
Author: Tom Tromey <tromey@redhat.com>
Date:   Fri Nov 22 17:38:44 2013 +0000

    Detect infinite loop in value_fetch_lazy's lval_register handling.

    If value_fetch_lazy loops infinitely while unwrapping lval_register
    values, it means we either somehow ended up with two frames with the
    same ID in the frame chain, or some code is trying to unwind behind
    get_prev_frame's back (e.g., a frame unwind sniffer trying to unwind).
    In any case, it should always be an internal error to end up in this
    situation.

    This patch adds a check and throws an internal error if the same frame
    is returned.

    2013-11-22  Tom Tromey  <tromey@redhat.com>
            Pedro Alves  <palves@redhat.com>

        PR backtrace/16155
        * value.c (value_fetch_lazy): Internal error if
        get_frame_register_value returns the same register.

-----------------------------------------------------------------------

Summary of changes:
 gdb/ChangeLog |    7 +++++++
 gdb/value.c   |   20 +++++++++++++++++++-
 2 files changed, 26 insertions(+), 1 deletions(-)

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