Update ucontext to implement sigreturn.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 bsd-user/arm/target_arch_signal.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/bsd-user/arm/target_arch_signal.h b/bsd-user/arm/target_arch_signal.h
index 177617ea8b..fd38b14c33 100644
--- a/bsd-user/arm/target_arch_signal.h
+++ b/bsd-user/arm/target_arch_signal.h
@@ -246,4 +246,13 @@ static inline abi_long set_mcontext(CPUARMState *env, target_mcontext_t *mcp,
     return err;
 }
 
+/* Compare to arm/arm/machdep.c sys_sigreturn() */
+static inline abi_long get_ucontext_sigreturn(CPUARMState *env,
+        abi_ulong target_sf, abi_ulong *target_uc)
+{
+    *target_uc = target_sf;
+
+    return 0;
+}
+
 #endif /* !_TARGET_ARCH_SIGNAL_H_ */
-- 
2.33.0