armv7m_nvic: fix AIRCR implementation

The returned reset value was wrong (off by one zero nibble), and
qemu didn't log unimplemented writes to the PRIGROUP field.

Signed-off-by: Oran Avraham <oranav@gmail.com>
Message-id: 1403010447-4627-1-git-send-email-oranav@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/intc/armv7m_nvic.c

@@ -211,7 +211,7 @@ static uint32_t nvic_readl(nvic_state *s, uint32_t offset)
         cpu = ARM_CPU(current_cpu);
         return cpu->env.v7m.vecbase;
     case 0xd0c: /* Application Interrupt/Reset Control.  */
-        return 0xfa05000;
+        return 0xfa050000;
     case 0xd10: /* System Control.  */
         /* TODO: Implement SLEEPONEXIT.  */
         return 0;
@@ -346,6 +346,9 @@ static void nvic_writel(nvic_state *s, uint32_t offset, uint32_t value)
             if (value & 5) {
                 qemu_log_mask(LOG_UNIMP, "AIRCR system reset unimplemented\n");
             }
+            if (value & 0x700) {
+                qemu_log_mask(LOG_UNIMP, "PRIGROUP unimplemented\n");
+            }
         }
         break;
     case 0xd10: /* System Control.  */