ARM: add arm_mode_name()

Add and use arm_mode_name() to map from PSR bits to user
meaningful names.   It uses a new table which, later, can
be used to hold other mode-coupled data.

Add definitions for the "Secure Monitor" mode, as seen on
some ARM11 cores (like ARM1176) and on Cortex-A8.  The
previous mode name scheme didn't understand that mode.

Remove the old mechanism ... there were two copies, caused
by Cortex-A8 needing to add "Secure Monitor" mode support.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

src/target/armv4_5.h

@@ -35,16 +35,16 @@ typedef enum armv4_5_mode
 	ARMV4_5_MODE_IRQ = 18,
 	ARMV4_5_MODE_SVC = 19,
 	ARMV4_5_MODE_ABT = 23,
+	ARM_MODE_MON = 26,
 	ARMV4_5_MODE_UND = 27,
 	ARMV4_5_MODE_SYS = 31,
 	ARMV4_5_MODE_ANY = -1
 } armv4_5_mode_t;
 
+const char *arm_mode_name(unsigned psr_mode);
 int armv4_5_mode_to_number(enum armv4_5_mode mode);
 enum armv4_5_mode armv4_5_number_to_mode(int number);
 
-extern const char **armv4_5_mode_strings;
-
 typedef enum armv4_5_state
 {
 	ARMV4_5_STATE_ARM,