Fixup AArch32 errata printing framework

The AArch32 assembly implementation of `print_errata_status` did not save
a register which was getting clobbered by a `get_cpu_ops_ptr`. This
patch fixes that.

Change-Id: Id0711e46b7c685a18a10328d4b513e952a5d860b
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

diff --git a/lib/cpus/aarch32/cpu_helpers.S b/lib/cpus/aarch32/cpu_helpers.S
index 72e42c67456b28ed7caeebc471d69f0005ad5336..ddc0808421b0c57694a2737a8d7ba5b004c72cca 100644 (file)
--- a/lib/cpus/aarch32/cpu_helpers.S
+++ b/lib/cpus/aarch32/cpu_helpers.S
@@ -206,7 +206,8 @@ endfunc cpu_rev_var_hs
  */
        .globl print_errata_status
 func print_errata_status
-       push    {r4, lr}
+       /* r12 is pushed only for the sake of 8-byte stack alignment */
+       push    {r4, r5, r12, lr}
 #ifdef IMAGE_BL1
        /*
         * BL1 doesn't have per-CPU data. So retrieve the CPU operations
@@ -241,6 +242,6 @@ func print_errata_status
        blxne   r4
 1:
 #endif
-       pop     {r4, pc}
+       pop     {r4, r5, r12, pc}
 endfunc print_errata_status
 #endif