AArch32: Fix the stack alignment issue
The AArch32 Procedure call Standard mandates that the stack must be aligned
to 8 byte boundary at external interfaces. This patch does the required
changes.
This problem was detected when a crash was encountered in
`psci_print_power_domain_map()` while printing 64 bit values. Aligning
the stack to 8 byte boundary resolved the problem.
Fixes ARM-Software/tf-issues#437
Change-Id: I517bd8203601bb88e9311bd36d477fb7b3efb292
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
diff --git a/lib/el3_runtime/aarch32/cpu_data.S b/lib/el3_runtime/aarch32/cpu_data.S
index b97911f..2de9029 100644
--- a/lib/el3_runtime/aarch32/cpu_data.S
+++ b/lib/el3_runtime/aarch32/cpu_data.S
@@ -41,9 +41,10 @@
* -----------------------------------------------------------------
*/
func _cpu_data
- push {lr}
+ /* r12 is pushed to meet the 8 byte stack alignment requirement */
+ push {r12, lr}
bl plat_my_core_pos
- pop {lr}
+ pop {r12, lr}
b _cpu_data_by_index
endfunc _cpu_data