[Bug libc/22667] makecontext lacks stack alignment on i386

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https://sourceware.org/bugzilla/show_bug.cgi?id=22667

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8a5df95ffa83f525a4f638ead743f4fa2b7fe45a

commit 8a5df95ffa83f525a4f638ead743f4fa2b7fe45a
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Jan 4 18:00:05 2018 +0100

    i386: In makecontext, align the stack before calling exit [BZ #22667]

    Before this change, if glibc was compiled with SSE instructions and a
    sufficiently recent GCC, an unaligned stack access in
    __run_exit_handlers would cause stdlib/tst-makecontext to crash.

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

Summary of changes:
 ChangeLog                                  |    8 +
 stdlib/Makefile                            |    3 +-
 stdlib/tst-makecontext-align.c             |  241 ++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/i386/makecontext.S |   14 ++-
 4 files changed, 263 insertions(+), 3 deletions(-)
 create mode 100644 stdlib/tst-makecontext-align.c

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