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[PULL,13/15] hw/intc/armv7m_nvic: Don't enable ARMV7M_EXCP_DEBUG from reset

Message ID 20190507120011.18100-14-peter.maydell@linaro.org
State Accepted
Commit a03ffaefce5dbb455ee1bc7c7709faf377dfbd45
Headers show
Series target-arm queue | expand

Commit Message

Peter Maydell May 7, 2019, noon UTC 
The M-profile architecture specifies that the DebugMonitor exception
should be initially disabled, not enabled. It should be controlled
by the DEMCR register's MON_EN bit, but we don't implement that
register yet (like most of the debug architecture for M-profile).

Note that BKPT instructions will still work, because they
will be escalated to HardFault.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

Message-id: 20190430131439.25251-4-peter.maydell@linaro.org
---
 hw/intc/armv7m_nvic.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

-- 
2.20.1
diff mbox series

Patch

diff --git a/hw/intc/armv7m_nvic.c b/hw/intc/armv7m_nvic.c
index 15cba63c964..3a346a682a3 100644
--- a/hw/intc/armv7m_nvic.c
+++ b/hw/intc/armv7m_nvic.c
@@ -2491,10 +2491,12 @@  static void armv7m_nvic_reset(DeviceState *dev)
      * the System Handler Control register
      */
     s->vectors[ARMV7M_EXCP_SVC].enabled = 1;
-    s->vectors[ARMV7M_EXCP_DEBUG].enabled = 1;
     s->vectors[ARMV7M_EXCP_PENDSV].enabled = 1;
     s->vectors[ARMV7M_EXCP_SYSTICK].enabled = 1;
 
+    /* DebugMonitor is enabled via DEMCR.MON_EN */
+    s->vectors[ARMV7M_EXCP_DEBUG].enabled = 0;
+
     resetprio = arm_feature(&s->cpu->env, ARM_FEATURE_V8) ? -4 : -3;
     s->vectors[ARMV7M_EXCP_RESET].prio = resetprio;
     s->vectors[ARMV7M_EXCP_NMI].prio = -2;