[Bug dynamic-link/22715] FAIL: elf/tst-audit10

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https://sourceware.org/bugzilla/show_bug.cgi?id=22715

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=17d5d67f4f0350bdcfb5bf1a31cef2e14dabf7de

commit 17d5d67f4f0350bdcfb5bf1a31cef2e14dabf7de
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jan 19 09:51:58 2018 -0800

    x86-64: Properly align La_x86_64_retval to VEC_SIZE [BZ #22715]

    _dl_runtime_profile calls _dl_call_pltexit, passing a pointer to
    La_x86_64_retval which is allocated on stack.  The lrv_vector0
    field in La_x86_64_retval must be aligned to size of vector register.
    When allocating stack space for La_x86_64_retval, we need to make sure
    that the address of La_x86_64_retval + RV_VECTOR0_OFFSET is aligned to
    VEC_SIZE.  This patch checks the alignment of the lrv_vector0 field
    and pads the stack space if needed.

    Tested with x32 and x86-64 on SSE4, AVX and AVX512 machines.  It fixed

    FAIL: elf/tst-audit10
    FAIL: elf/tst-audit4
    FAIL: elf/tst-audit5
    FAIL: elf/tst-audit6
    FAIL: elf/tst-audit7

    on x32 AVX512 machine.

    (cherry picked from commit 207a72e2988c6d6343f50fe0128eb4fc4edfdd15)

        [BZ #22715]
        * sysdeps/x86_64/dl-trampoline.h (_dl_runtime_profile): Properly
        align La_x86_64_retval to VEC_SIZE.

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

Summary of changes:
 ChangeLog                      |    6 ++++++
 NEWS                           |    1 +
 sysdeps/x86_64/dl-trampoline.h |   12 ++++++++++--
 3 files changed, 17 insertions(+), 2 deletions(-)

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