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/signal.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/bsd-user/arm/signal.c b/bsd-user/arm/signal.c
index fb6228db6cf..1478f008d13 100644
--- a/bsd-user/arm/signal.c
+++ b/bsd-user/arm/signal.c
@@ -185,3 +185,12 @@ abi_long set_mcontext(CPUARMState *env, target_mcontext_t *mcp, int srflag)
 
     return err;
 }
+
+/* Compare to arm/arm/machdep.c sys_sigreturn() */
+abi_long get_ucontext_sigreturn(CPUARMState *env, abi_ulong target_sf,
+                                abi_ulong *target_uc)
+{
+    *target_uc = target_sf;
+
+    return 0;
+}
-- 
2.33.1