arm: Use different enum for core_type and core_mode

The fields core_type and core_mode use the same enum arm_mode
but encode different information, making the code less immediate
to read.

Use a different enum arm_core_type for the field core_type.
The code behavior is not changed.

Change-Id: I60f2095ea6801dfe22f6da81ec295ca71ef90466
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5258
Tested-by: jenkins

src/target/arm.h

@@ -40,6 +40,22 @@
  * support has not yet been integrated, affecting Cortex-M parts.
  */
 
+/**
+ * Indicates what registers are in the ARM state core register set.
+ *
+ * - ARM_CORE_TYPE_STD indicates the standard set of 37 registers, seen
+ *   on for example ARM7TDMI cores.
+ * - ARM_CORE_TYPE_SEC_EXT indicates core has security extensions, thus
+ *   three more registers are shadowed for "Secure Monitor" mode.
+ * - ARM_CORE_TYPE_M_PROFILE indicates a microcontroller profile core,
+ *   which only shadows SP.
+ */
+enum arm_core_type {
+	ARM_CORE_TYPE_STD = -1,
+	ARM_CORE_TYPE_SEC_EXT = 1,
+	ARM_CORE_TYPE_M_PROFILE,
+};
+
 /**
  * Represent state of an ARM core.
  *
@@ -161,15 +177,8 @@ struct arm {
 	/** Support for arm_reg_current() */
 	const int *map;
 
-	/**
-	 * Indicates what registers are in the ARM state core register set.
-	 * ARM_MODE_ANY indicates the standard set of 37 registers,
-	 * seen on for example ARM7TDMI cores.  ARM_MODE_MON indicates three
-	 * more registers are shadowed, for "Secure Monitor" mode.
-	 * ARM_MODE_THREAD indicates a microcontroller profile core,
-	 * which only shadows SP.
-	 */
-	enum arm_mode core_type;
+	/** Indicates what registers are in the ARM state core register set. */
+	enum arm_core_type core_type;
 
 	/** Record the current core mode: SVC, USR, or some other mode. */
 	enum arm_mode core_mode;