nvic: Support banked exceptions in acknowledge and complete

Update armv7m_nvic_acknowledge_irq() and armv7m_nvic_complete_irq()
to handle banked exceptions:
 * acknowledge needs to use the correct vector, which may be
   in sec_vectors[]
 * acknowledge needs to return to its caller whether the
   exception should be taken to secure or non-secure state
 * complete needs its caller to tell it whether the exception
   being completed is a secure one or not

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1505240046-11454-20-git-send-email-peter.maydell@linaro.org

1 files changed, 13 insertions, 2 deletions

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index c21c59228b..8afceca873 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1476,18 +1476,29 @@ static inline bool armv7m_nvic_can_take_pending_exception(void *opaque)
  * of architecturally banked exceptions.
  */
 void armv7m_nvic_set_pending(void *opaque, int irq, bool secure);
-void armv7m_nvic_acknowledge_irq(void *opaque);
+/**
+ * armv7m_nvic_acknowledge_irq: make highest priority pending exception active
+ * @opaque: the NVIC
+ *
+ * Move the current highest priority pending exception from the pending
+ * state to the active state, and update v7m.exception to indicate that
+ * it is the exception currently being handled.
+ *
+ * Returns: true if exception should be taken to Secure state, false for NS
+ */
+bool armv7m_nvic_acknowledge_irq(void *opaque);
 /**
  * armv7m_nvic_complete_irq: complete specified interrupt or exception
  * @opaque: the NVIC
  * @irq: the exception number to complete
+ * @secure: true if this exception was secure
  *
  * Returns: -1 if the irq was not active
  *           1 if completing this irq brought us back to base (no active irqs)
  *           0 if there is still an irq active after this one was completed
  * (Ignoring -1, this is the same as the RETTOBASE value before completion.)
  */
-int armv7m_nvic_complete_irq(void *opaque, int irq);
+int armv7m_nvic_complete_irq(void *opaque, int irq, bool secure);
 /**
  * armv7m_nvic_raw_execution_priority: return the raw execution priority
  * @opaque: the NVIC