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    Subject[PATCH 12/17] [SPARC64]: Fix ptrace/strace
    -stable review patch.  If anyone has any objections, please let us know.
    ------------------

    Don't clobber register %l0 while checking TI_SYS_NOERROR value in
    syscall return path. This bug was introduced by:

    db7d9a4eb700be766cc9f29241483dbb1e748832

    Problem narrowed down by Luis F. Ortiz and Richard Mortimer.

    I tried using %l2 as suggested by Luis and that works for me.

    Looking at the code I wonder if it makes sense to simplify the code
    a little bit. The following works for me but I'm not sure how to
    exercise the "NOERROR" codepath.

    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---

    arch/sparc64/kernel/entry.S | 7 ++-----
    1 files changed, 2 insertions(+), 5 deletions(-)

    Index: linux-2.6.15.y/arch/sparc64/kernel/entry.S
    ===================================================================
    --- linux-2.6.15.y.orig/arch/sparc64/kernel/entry.S
    +++ linux-2.6.15.y/arch/sparc64/kernel/entry.S
    @@ -1657,13 +1657,10 @@ ret_sys_call:
    /* Check if force_successful_syscall_return()
    * was invoked.
    */
    - ldub [%curptr + TI_SYS_NOERROR], %l0
    - brz,pt %l0, 1f
    - nop
    - ba,pt %xcc, 80f
    + ldub [%curptr + TI_SYS_NOERROR], %l2
    + brnz,a,pn %l2, 80f
    stb %g0, [%curptr + TI_SYS_NOERROR]

    -1:
    cmp %o0, -ERESTART_RESTARTBLOCK
    bgeu,pn %xcc, 1f
    andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %l6
    --
    -
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