Guo Ren dd3ef10ea2 csky: VDSO and rt_sigreturn ...

This patch adds files related to VDSO and our VDSO only support
rt_sigreturn.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

2018-10-26 00:54:22 +08:00

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