[PATCH for-8.0 v4 2/4] target/arm: Stub arm_hcr_el2_eff for m-profile

[Richard Henderson]

M-profile doesn't have HCR_EL2.  While we could test features
before each call, zero is a generally safe return value to
disable the code in the caller.  This test is required to
avoid an assert in arm_is_secure_below_el3.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 14af7ba095..bd12efd392 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -5788,6 +5788,9 @@ uint64_t arm_hcr_el2_eff_secstate(CPUARMState *env, bool 
secure)
 
 uint64_t arm_hcr_el2_eff(CPUARMState *env)
 {
+    if (arm_feature(env, ARM_FEATURE_M)) {
+        return 0;
+    }
     return arm_hcr_el2_eff_secstate(env, arm_is_secure_below_el3(env));
 }
 
-- 
2.34.1