Fix BL2U entrypoint possible parameter corruption
Replace the use of r12 by r10 to save the value of a parameter of
bl2u_entrypoint to pass it to bl2u_early_platform_setup at the end of
the function. r10 is a callee saved register so it will not become
corrupted by C code, whereas r12 is the The Intra-Procedure-call scratch
register potentially used by veneers. See the ARM AAPCS document (ARM
IHI 0042F).
Change-Id: I4f37e54a6b550719edb40bb24cd8f498827e2749
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>
diff --git a/bl2u/aarch32/bl2u_entrypoint.S b/bl2u/aarch32/bl2u_entrypoint.S
index 1fa669e..7fb64f3 100644
--- a/bl2u/aarch32/bl2u_entrypoint.S
+++ b/bl2u/aarch32/bl2u_entrypoint.S
@@ -32,7 +32,7 @@
* ---------------------------------------------
*/
mov r11, r1
- mov r12, r2
+ mov r10, r2
/* ---------------------------------------------
* Set the exception vector to something sane.
@@ -107,7 +107,7 @@
* ---------------------------------------------
*/
mov r0, r11
- mov r1, r12
+ mov r1, r10
bl bl2u_early_platform_setup
bl bl2u_plat_arch_setup