[Bug libc/22685] PowerPC: Static AT_SECURE binaries segfault with lock-elision and tunables

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https://sourceware.org/bugzilla/show_bug.cgi?id=22685

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4612268a0ad8e3409d8ce2314dd2dd8ee0af5269

commit 4612268a0ad8e3409d8ce2314dd2dd8ee0af5269
Author: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Date:   Fri Jan 12 18:50:33 2018 -0200

    powerpc: Fix syscalls during early process initialization [BZ #22685]

    The tunables framework needs to execute syscall early in process
    initialization, before the TCB is available for consumption.  This
    behavior conflicts with powerpc{|64|64le}'s lock elision code, that
    checks the TCB before trying to abort transactions immediately before
    executing a syscall.

    This patch adds a powerpc-specific implementation of __access_noerrno
    that does not abort transactions before the executing syscall.

    Tested on powerpc{|64|64le}.

        [BZ #22685]
        * sysdeps/powerpc/powerpc32/sysdep.h (ABORT_TRANSACTION_IMPL): Renamed
        from ABORT_TRANSACTION.
        (ABORT_TRANSACTION): Redirect to ABORT_TRANSACTION_IMPL.
        * sysdeps/powerpc/powerpc64/sysdep.h (ABORT_TRANSACTION,
        ABORT_TRANSACTION_IMPL): Likewise.
        * sysdeps/unix/sysv/linux/powerpc/not-errno.h: New file.  Reuse
        Linux code, but remove the code that aborts transactions.

    Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
    Tested-by: Aurelien Jarno <aurelien@aurel32.net>

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

Summary of changes:
 ChangeLog                                          |   11 +++++++++
 sysdeps/powerpc/powerpc32/sysdep.h                 |    5 ++-
 sysdeps/powerpc/powerpc64/sysdep.h                 |    5 ++-
 .../unix/sysv/linux/powerpc/not-errno.h            |   23 +++++++++++--------
 4 files changed, 30 insertions(+), 14 deletions(-)
 copy support/xsigaction.c => sysdeps/unix/sysv/linux/powerpc/not-errno.h (60%)

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