[Bug dynamic-link/25905] VSX registers are corrupted during PLT resolution when glibc is built with --disable-multi-arch and --with-cpu=power9

["tuliom at ascii dot art.br" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25905

Tulio Magno Quites Machado Filho <tuliom at ascii dot art.br> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #4 from Tulio Magno Quites Machado Filho <tuliom at ascii dot art.br> ---
As mentioned in the previous comment, this issue has been fixed with:

commit 4a4db1de2f0fd936b583698dcc1b1c12a71828c8
Author: Paul E. Murphy <murphyp@linux.vnet.ibm.com>
Date:   Fri May 1 14:30:42 2020 -0500

    powerpc64le/power9: guard power9 strcmp against rtld usage [BZ# 25905]

    strcmp is used while resolving PLT references.  Vector registers
    should not be used during this.  The P9 strcmp makes heavy use of
    vector registers, so it should be avoided in rtld.

    This prevents quiet vector register corruption when glibc is configured
    with --disable-multi-arch and --with-cpu=power9.  This can be seen with
    test-float64x-compat_totalordermag during the first call into
    totalordermagf64x@GLIBC_2.27.

    Add a guard to fallback to the power8 implementation when building
    power9 strcmp for libraries other than libc.

    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

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