ARM: add "core_type" field to "struct arm"

It's used to flag cores with the "TrustZone" extension,
and is used in subsequent patches to set up support for
the registers shadowed by its new secure monitor mode.

The ARM1176 and Cortex-A8 both support this new mode.

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

src/target/arm11.c

@@ -1780,6 +1780,11 @@ static int arm11_init_target(struct command_context *cmd_ctx,
 		struct target *target)
 {
 	/* Initialize anything we can set up without talking to the target */
+
+	/* FIXME Switch to use the standard build_reg_cache() not custom
+	 * code.  Do it from examine(), after we check whether we're
+	 * an arm1176 and thus support the Secure Monitor mode.
+	 */
 	return arm11_build_reg_cache(target);
 }
 
@@ -1787,7 +1792,7 @@ static int arm11_init_target(struct command_context *cmd_ctx,
 static int arm11_examine(struct target *target)
 {
 	int retval;
-
+	char *type;
 	FNC_INFO;
 	struct arm11_common *arm11 = target_to_arm11(target);
 
@@ -1818,13 +1823,21 @@ static int arm11_examine(struct target *target)
 
 	switch (arm11->device_id & 0x0FFFF000)
 	{
-	case 0x07B36000:	LOG_INFO("found ARM1136"); break;
+	case 0x07B36000:
-	case 0x07B56000:	LOG_INFO("found ARM1156"); break;
+		type = "ARM1136";
-	case 0x07B76000:	LOG_INFO("found ARM1176"); break;
+		break;
+	case 0x07B56000:
+		type = "ARM1156";
+		break;
+	case 0x07B76000:
+		arm11->arm.core_type = ARM_MODE_MON;
+		type = "ARM1176";
+		break;
 	default:
 		LOG_ERROR("'target arm11' expects IDCODE 0x*7B*7****");
 		return ERROR_FAIL;
 	}
+	LOG_INFO("found %s", type);
 
 	arm11->debug_version = (arm11->didr >> 16) & 0x0F;
 

src/target/armv4_5.c

@@ -1015,5 +1015,8 @@ int armv4_5_init_arch_info(struct target *target, struct arm *armv4_5)
 	armv4_5->core_state = ARMV4_5_STATE_ARM;
 	armv4_5->core_mode = ARMV4_5_MODE_USR;
 
+	/* core_type may be overridden by subtype logic */
+	armv4_5->core_type = ARMV4_5_MODE_ANY;
+
 	return ERROR_OK;
 }

src/target/armv4_5.h

@@ -89,7 +89,15 @@ struct arm
 	int common_magic;
 	struct reg_cache *core_cache;
 
-	int /* armv4_5_mode */ core_mode;
+	/**
+	 * Indicates what registers are in the ARM state core register set.
+	 * ARMV4_5_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.
+	 */
+	enum armv4_5_mode core_type;
+
+	enum armv4_5_mode core_mode;
 	enum armv4_5_state core_state;
 
 	/** Flag reporting unavailability of the BKPT instruction. */

src/target/cortex_a8.c

@@ -1423,6 +1423,8 @@ static void cortex_a8_build_reg_cache(struct target *target)
 	struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
 	struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 
+	armv4_5->core_type = ARM_MODE_MON;
+
 	(*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
 	armv4_5->core_cache = (*cache_p);
 }