[Bug libc/21049] segfault in longjmp_chk() due to clobbered processor register

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https://sourceware.org/bugzilla/show_bug.cgi?id=21049

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5b3f978ccf92e3c5213266500d70d3b0359b5efc

commit 5b3f978ccf92e3c5213266500d70d3b0359b5efc
Author: John David Anglin <danglin@gcc.gnu.org>
Date:   Tue Aug 8 21:29:21 2017 -0400

    hppa: Fix register corruption in __longjmp.

        [BZ #21049]
            * sysdeps/hppa/__longjmp.c (__longjmp): Move call to CHECK_SP up
            to avoid clobbering r26.

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Summary of changes:
 ChangeLog                |    6 ++++++
 sysdeps/hppa/__longjmp.c |    9 +++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

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