diff --git a/bl1/aarch64/bl1_entrypoint.S b/bl1/aarch64/bl1_entrypoint.S
index 0f8d5aa..855add3 100644
--- a/bl1/aarch64/bl1_entrypoint.S
+++ b/bl1/aarch64/bl1_entrypoint.S
@@ -38,15 +38,12 @@
 	 */
 	bl	bl1_setup
 
+#if ENABLE_PAUTH
 	/* --------------------------------------------------------------------
-	 * Enable pointer authentication
+	 * Program APIAKey_EL1 and enable pointer authentication.
 	 * --------------------------------------------------------------------
 	 */
-#if ENABLE_PAUTH
-	mrs	x0, sctlr_el3
-	orr	x0, x0, #SCTLR_EnIA_BIT
-	msr	sctlr_el3, x0
-	isb
+	bl	pauth_init_enable_el3
 #endif /* ENABLE_PAUTH */
 
 	/* --------------------------------------------------------------------
@@ -56,16 +53,12 @@
 	 */
 	bl	bl1_main
 
+#if ENABLE_PAUTH
 	/* --------------------------------------------------------------------
-	 * Disable pointer authentication before jumping to BL31 or that will
-	 * cause an authentication failure during the early platform init.
+	 * Disable pointer authentication before jumping to next boot image.
 	 * --------------------------------------------------------------------
 	 */
-#if ENABLE_PAUTH
-	mrs	x0, sctlr_el3
-	bic	x0, x0, #SCTLR_EnIA_BIT
-	msr	sctlr_el3, x0
-	isb
+	bl	pauth_disable_el3
 #endif /* ENABLE_PAUTH */
 
 	/* --------------------------------------------------
diff --git a/bl1/aarch64/bl1_exceptions.S b/bl1/aarch64/bl1_exceptions.S
index ed7c27a..3e72e39 100644
--- a/bl1/aarch64/bl1_exceptions.S
+++ b/bl1/aarch64/bl1_exceptions.S
@@ -164,7 +164,7 @@
 	 * ----------------------------------------------
 	 */
 	ldr	x30, [sp, #CTX_EL3STATE_OFFSET + CTX_RUNTIME_SP]
-	msr	spsel, #0
+	msr	spsel, #MODE_SP_EL0
 	mov	sp, x30
 
 	/* ---------------------------------------------------------------------
@@ -217,19 +217,14 @@
 	 */
 smc_handler:
 	/* -----------------------------------------------------
-	 * Save the GP registers x0-x29.
-	 * TODO: Revisit to store only SMCCC specified registers.
-	 * -----------------------------------------------------
-	 */
-	bl	save_gp_registers
-
-	/* -----------------------------------------------------
+	 * Save x0-x29 and ARMv8.3-PAuth (if enabled) registers.
 	 * If Secure Cycle Counter is not disabled in MDCR_EL3
 	 * when ARMv8.5-PMU is implemented, save PMCR_EL0 and
-	 * disable all event counters and cycle counter.
+	 * disable Cycle Counter.
+	 * TODO: Revisit to store only SMCCC specified registers.
 	 * -----------------------------------------------------
 	 */
-	bl	save_pmcr_disable_pmu
+	bl	save_gp_pmcr_pauth_regs
 
 	/* -----------------------------------------------------
 	 * Populate the parameters for the SMC handler. We
@@ -255,7 +250,7 @@
 	 * Switch back to SP_EL0 for the C runtime stack.
 	 * ---------------------------------------------
 	 */
-	msr	spsel, #0
+	msr	spsel, #MODE_SP_EL0
 	mov	sp, x12
 
 	/* -----------------------------------------------------