[Bug libc/21045] [powerpc-nofpu] swapcontext does not restore signal mask

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https://sourceware.org/bugzilla/show_bug.cgi?id=21045

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b040e1b0842c35ab444e8502db6ae59389d1e3d5

commit b040e1b0842c35ab444e8502db6ae59389d1e3d5
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Jan 16 21:34:48 2017 +0000

    Make soft-float powerpc swapcontext restore the signal mask (bug 21045).

    The soft-float powerpc version of swapcontext does not restore the
    signal mask, resulting in stdlib/tst-setcontext2 failing:

    after getcontext
    after setcontext
    after swapcontext
    FAIL: SIGUSR2 is blocked after swapcontext.

    This patch fixes this by adjusting the arguments passed to
    __sigprocmask so that it restores the saved signal mask as well as
    saving the existing one.  (For hard-float, this code is only used for
    a compat symbol, not for the current version of swapcontext.)

    Tested for soft-float powerpc.

        [BZ #21045]
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
        (__CONTEXT_FUNC_NAME): Pass address of signal mask to be restored
        to __sigprocmask.

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

Summary of changes:
 ChangeLog                                          |    7 +++++++
 .../linux/powerpc/powerpc32/swapcontext-common.S   |    3 ++-
 2 files changed, 9 insertions(+), 1 deletions(-)

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