refactor(el3-runtime): add prepare_el3_entry func
In the next patch we add an extra step of setting the PSTATE
registers to a known state on el3 entry. In this patch we create
the function prepare_el3_entry to wrap the steps needed for before
el3 entry. For now this is only save_gp_pmcr_pauth_regs.
Change-Id: Ie26dc8d89bfaec308769165d2649e84d41be196c
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
diff --git a/lib/el3_runtime/aarch64/context.S b/lib/el3_runtime/aarch64/context.S
index c9035e8..bea72c8 100644
--- a/lib/el3_runtime/aarch64/context.S
+++ b/lib/el3_runtime/aarch64/context.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -21,7 +21,7 @@
.global fpregs_context_save
.global fpregs_context_restore
#endif
- .global save_gp_pmcr_pauth_regs
+ .global prepare_el3_entry
.global restore_gp_pmcr_pauth_regs
.global save_and_update_ptw_el1_sys_regs
.global el3_exit
@@ -683,7 +683,7 @@
#endif /* CTX_INCLUDE_FPREGS */
/* ------------------------------------------------------------------
- * The following function is used to save and restore all the general
+ * The following macro is used to save and restore all the general
* purpose and ARMv8.3-PAuth (if enabled) registers.
* It also checks if Secure Cycle Counter is not disabled in MDCR_EL3
* when ARMv8.5-PMU is implemented, and if called from Non-secure
@@ -693,12 +693,10 @@
* when a world switch occurs but that type of implementation is more
* complex. So currently we will always save and restore these
* registers on entry and exit of EL3.
- * These are not macros to ensure their invocation fits within the 32
- * instructions per exception vector.
* clobbers: x18
* ------------------------------------------------------------------
*/
-func save_gp_pmcr_pauth_regs
+ .macro save_gp_pmcr_pauth_regs
stp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0]
stp x2, x3, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2]
stp x4, x5, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X4]
@@ -770,8 +768,18 @@
stp x28, x29, [x19, #CTX_PACGAKEY_LO]
#endif /* CTX_INCLUDE_PAUTH_REGS */
+ .endm /* save_gp_pmcr_pauth_regs */
+
+/* -----------------------------------------------------------------
+ * This function saves the context preparing entry to el3.
+ * Save all the general purpose and ARMv8.3-PAuth (if enabled)
+ * registers.
+ * -----------------------------------------------------------------
+ */
+func prepare_el3_entry
+ save_gp_pmcr_pauth_regs
ret
-endfunc save_gp_pmcr_pauth_regs
+endfunc prepare_el3_entry
/* ------------------------------------------------------------------
* This function restores ARMv8.3-PAuth (if enabled) and all general