target/arm: Add missing entries to excnames[] for log strings

Recent changes have added new EXCP_ values to ARM but forgot
to update the excnames[] array which is used to provide
human-readable strings when printing information about the
exception for debug logging. Add the missing entries, and
add a comment to the list of #defines to help avoid the mistake
being repeated in future.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1491486340-25988-1-git-send-email-peter.maydell@linaro.org

target/arm/cpu.h

@@ -58,6 +58,7 @@
 #define EXCP_SEMIHOST       16   /* semihosting call */
 #define EXCP_NOCP           17   /* v7M NOCP UsageFault */
 #define EXCP_INVSTATE       18   /* v7M INVSTATE UsageFault */
+/* NB: new EXCP_ defines should be added to the excnames[] array too */
 
 #define ARMV7M_EXCP_RESET   1
 #define ARMV7M_EXCP_NMI     2

target/arm/internals.h

@@ -70,6 +70,8 @@ static const char * const excnames[] = {
     [EXCP_VIRQ] = "Virtual IRQ",
     [EXCP_VFIQ] = "Virtual FIQ",
     [EXCP_SEMIHOST] = "Semihosting call",
+    [EXCP_NOCP] = "v7M NOCP UsageFault",
+    [EXCP_INVSTATE] = "v7M INVSTATE UsageFault",
 };
 
 /* Scale factor for generic timers, ie number of ns per tick.