Access system registers directly in assembler
Instead of using the system register helper functions to read
or write system registers, assembler coded functions should
use MRS/MSR instructions. This results in faster and more
compact code.
This change replaces all usage of the helper functions with
direct register accesses.
Change-Id: I791d5f11f257010bb3e6a72c6c5ab8779f1982b3
diff --git a/bl1/aarch64/bl1_exceptions.S b/bl1/aarch64/bl1_exceptions.S
index 71fd4cd..a87b20f 100644
--- a/bl1/aarch64/bl1_exceptions.S
+++ b/bl1/aarch64/bl1_exceptions.S
@@ -189,7 +189,7 @@
mov x0, #SYNC_EXCEPTION_AARCH64
bl plat_report_exception
- bl read_esr_el3
+ mrs x0, esr_el3
ubfx x1, x0, #ESR_EC_SHIFT, #ESR_EC_LENGTH
cmp x1, #EC_AARCH64_SMC
b.ne panic
@@ -201,10 +201,8 @@
mov x2, x3
mov x3, x4
bl display_boot_progress
- mov x0, x20
- bl write_elr
- mov x0, x21
- bl write_spsr
+ msr elr_el3, x20
+ msr spsr_el3, x21
ubfx x0, x21, #MODE_EL_SHIFT, #2
cmp x0, #MODE_EL3
b.ne skip_mmu_teardown
@@ -216,7 +214,7 @@
* ---------------------------------------------
*/
bl disable_mmu_icache_el3
- bl tlbialle3
+ tlbi alle3
skip_mmu_teardown:
ldp x6, x7, [sp, #0x30]
ldp x4, x5, [sp, #0x20]