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Fixup register handling in aarch32 reset_handler

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The BL handover interface stores the bootloader arguments in
registers r9-r12, so when the reset_handler stores the lr pointer
in r10 it clobers one of the arguments.

Adapt to use r8 and adapt the comment about registers allowed
to clober.

I've checked aarch32 reset_handlers and none seem to use higher
registers as far as I can tell.

Fixes: a6f340fe58 ("Introduce the new BL handover interface")
Cc: Soby Mathew <soby.mathew@arm.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Heiko Stuebner 2019-03-06 00:29:13 +01:00 • committed by Dimitris Papastamos
parent 78d58519de
commit c6c10b02b8
1 changed files with 3 additions and 3 deletions
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6
lib/cpus/aarch32/cpu_helpers.S
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@ -22,9 +22,9 @@
*/
.globl reset_handler
func reset_handler
mov r10, lr
mov r8, lr
/* The plat_reset_handler can clobber r0 - r9 */
/* The plat_reset_handler can clobber r0 - r7 */
bl plat_reset_handler
/* Get the matching cpu_ops pointer (clobbers: r0 - r5) */
@ -38,7 +38,7 @@ func reset_handler
/* Get the cpu_ops reset handler */
ldr r1, [r0, #CPU_RESET_FUNC]
cmp r1, #0
mov lr, r10
mov lr, r8
bxne r1
bx lr
endfunc reset_handler