[Qemu-devel] [PATCH v2 10/26] armv7m: auto-clear FAULTMASK

[Michael Davidsaver]

on return from all exceptions other than NMI
---
 target-arm/helper.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index d1ca011..b6ec761 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -5379,8 +5379,13 @@ static void do_v7m_exception_exit(CPUARMState *env)
     uint32_t xpsr;
 
     type = env->regs[15];
-    if (env->v7m.exception != 0)
+    if (env->v7m.exception != ARMV7M_EXCP_NMI) {
+        /* Auto-clear FAULTMASK on return from other than NMI */
+        env->daif &= ~PSTATE_F;
+    }
+    if (env->v7m.exception != 0) {
         armv7m_nvic_complete_irq(env->nvic, env->v7m.exception);
+    }
 
     /* Switch to the target stack.  */
     switch_v7m_sp(env, (type & 4) != 0);
-- 
2.1.4