diff options
| -rw-r--r-- | target/arm/helper.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c index 88394d497b..f21c142602 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -10091,8 +10091,11 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val) * thread mode; other bits can be updated by any privileged code. * write_v7m_control_spsel() deals with updating the SPSEL bit in * env->v7m.control, so we only need update the others. + * For v7M, we must just ignore explicit writes to SPSEL in handler + * mode; for v8M the write is permitted but will have no effect. */ - if (!arm_v7m_is_handler_mode(env)) { + if (arm_feature(env, ARM_FEATURE_V8) || + !arm_v7m_is_handler_mode(env)) { write_v7m_control_spsel(env, (val & R_V7M_CONTROL_SPSEL_MASK) != 0); } env->v7m.control[env->v7m.secure] &= ~R_V7M_CONTROL_NPRIV_MASK; |