[Bug dynamic-link/19129] [arm] Concurrent lazy TLSDESC resolution can crash

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https://sourceware.org/bugzilla/show_bug.cgi?id=19129

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1fae5a6800b07d0a8225664ac65a628bbe98cae7

commit 1fae5a6800b07d0a8225664ac65a628bbe98cae7
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Wed Oct 14 16:58:41 2015 +0100

    [BZ #19129][ARM] Fix _dl_tlsdesc_resolve_hold to save r0

    _dl_tlsdesc_resolve_hold calls into a C function that clobbers r0,
    but it assumes the original argument is still in r0 after the call.
    This can cause crash in case of concurrent TLS access when TLSDESC
    is in use (-mtls-dialect=gnu2).

    Run into this while fixing BZ 18572.

    Both r0 and r1 are saved/restored so the stack remains 8 byte aligned.

        [BZ #19129]
        * sysdeps/arm/dl-tlsdesc.S (_dl_tlsdesc_resolve_hold): Save and restore
        r0 and r1.

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

Summary of changes:
 ChangeLog                |    6 ++++++
 NEWS                     |    2 +-
 sysdeps/arm/dl-tlsdesc.S |   27 ++++++++++++++++++---------
 3 files changed, 25 insertions(+), 10 deletions(-)

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