Merge "Add support for Branch Target Identification" into integration

lib/xlat_tables_v2/xlat_tables_utils.c

 /*
- * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -96,6 +96,13 @@ static void xlat_desc_print(const xlat_ctx_t *ctx, uint64_t desc)
 	}
 
 	printf(((LOWER_ATTRS(NS) & desc) != 0ULL) ? "-NS" : "-S");
+
+#ifdef AARCH64
+	/* Check Guarded Page bit */
+	if ((desc & GP) != 0ULL) {
+		printf("-GP");
+	}
+#endif
 }
 
 static const char * const level_spacers[] = {

make_helpers/defaults.mk

@@ -33,6 +33,9 @@ BL2_AT_EL3			:= 0
 # when BL2_AT_EL3 is 1.
 BL2_IN_XIP_MEM			:= 0
 
+# Select the branch protection features to use.
+BRANCH_PROTECTION		:= 0
+
 # By default, consider that the platform may release several CPUs out of reset.
 # The platform Makefile is free to override this value.
 COLD_BOOT_SINGLE_CPU		:= 0
@@ -90,7 +93,14 @@ ENABLE_STACK_PROTECTOR		:= 0
 # Flag to enable exception handling in EL3
 EL3_EXCEPTION_HANDLING		:= 0
 
-# Flag to enable Pointer Authentication
+# Flag to enable Branch Target Identification.
+# Internal flag not meant for direct setting.
+# Use BRANCH_PROTECTION to enable BTI.
+ENABLE_BTI			:= 0
+
+# Flag to enable Pointer Authentication.
+# Internal flag not meant for direct setting.
+# Use BRANCH_PROTECTION to enable PAUTH.
 ENABLE_PAUTH			:= 0
 
 # Build flag to treat usage of deprecated platform and framework APIs as error.