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Hijack the return address and replace it with a trampoline address. PowerPC implementation. Signed-off-by: Anton Arapov <anton@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com>