Alexander, could you help me with ARM? I found in glibc sources, that
sa_restoer should look like this:

ports/sysdeps/unix/sysv/linux/arm/sigrestorer.S
....
ENTRY(__cr_restore_rt)
        CFI
        mov     r7, $SYS_ify(rt_sigreturn)
        swi     0x0
        .fnend
END(__cr_restore_rt)

v2: Move architecture-dependent code in the proper place
v3: Don't add a separate handler for collecting zombies

Cc: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>