target/s390x: Implement STCK et al for CONFIG_USER_ONLY
This is a non-privileged instruction that was only implemented for system mode. However, the stck instruction is used by glibc, so this was causing SIGILL for programs run under debian stretch. Reviewed-by: NThomas Huth <thuth@redhat.com> Reviewed-by: NDavid Hildenbrand <david@redhat.com> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org> Message-Id: <20190212053044.29015-3-richard.henderson@linaro.org> Signed-off-by: NCornelia Huck <cohuck@redhat.com>
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