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Subject: [Bug dynamic-link/26798] aarch64: variant PCS symbols may be
 incorrectly lazy bound
Date: Wed, 04 Nov 2020 12:42:10 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26798

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The release/2.29/master branch has been updated by Szabolcs Nagy
<nsz@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3Da3c78954ee0009e558b=
7e6b9eb05208814099e21

commit a3c78954ee0009e558b7e6b9eb05208814099e21
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Thu Oct 22 17:55:01 2020 +0100

    aarch64: Fix DT_AARCH64_VARIANT_PCS handling [BZ #26798]

    The variant PCS support was ineffective because in the common case
    linkmap->l_mach.plt =3D=3D 0 but then the symbol table flags were ignor=
ed
    and normal lazy binding was used instead of resolving the relocs early.
    (This was a misunderstanding about how GOT[1] is setup by the linker.)

    In practice this mainly affects SVE calls when the vector length is
    more than 128 bits, then the top bits of the argument registers get
    clobbered during lazy binding.

    Fixes bug 26798.

    (cherry picked from commit 558251bd8785760ad40fcbfeaaee5d27fa5b0fe4)

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