FVP: Fix AArch32 stack functions to be ABI-compliant
plat_get_my_stack is called from C, so it can't expect argument
registers to be preserved. Stash registers temporarily onto the stack
instead.
plat_set_my_stack is called during early init, when there exists no
stack. Use any register other than argument registers to stash temporary
values.
Change-Id: I98052e20671d0933201d45ec7a5affccd71ce08c
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/plat/common/aarch32/platform_mp_stack.S b/plat/common/aarch32/platform_mp_stack.S
index e43047e..6c3d08d 100644
--- a/plat/common/aarch32/platform_mp_stack.S
+++ b/plat/common/aarch32/platform_mp_stack.S
@@ -19,9 +19,9 @@
* -----------------------------------------------------
*/
func plat_get_my_stack
- mov r3, lr
+ push {r4, lr}
get_my_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE
- bx r3
+ pop {r4, pc}
endfunc plat_get_my_stack
/* -----------------------------------------------------
@@ -32,10 +32,10 @@
* -----------------------------------------------------
*/
func plat_set_my_stack
- mov r3, lr
+ mov r4, lr
get_my_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE
mov sp, r0
- bx r3
+ bx r4
endfunc plat_set_my_stack
/* -----------------------------------------------------
