On Sat, Oct 8, 2016 at 7:08 PM, Chenhui Zhao <chenhui.z...@nxp.com> wrote:
> Save and restore core registers from r4 to r12 so that PSCI code won't
> break their value.
>
> Signed-off-by: Chenhui Zhao <chenhui.z...@nxp.com>
> Signed-off-by: Alison Wang <alison.w...@nxp.com>
> Signed-off-by: Abhimanyu Saini <abhimanyu.sa...@nxp.com>
> ---
> arch/arm/cpu/armv7/psci.S | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S
> index 6a36208..746297c 100644
> --- a/arch/arm/cpu/armv7/psci.S
> +++ b/arch/arm/cpu/armv7/psci.S
> @@ -152,7 +152,7 @@ _psci_table:
> .word 0
>
> _smc_psci:
> - push {r4-r7,lr}
> + push {r4-r12,lr}
This change is not needed. This function only uses r4-r7.
Any subroutines called should save variable registers (r4-r12)
themselves, per the ARM calling conventions.
ChenYu
>
> @ Switch to secure
> mrc p15, 0, r7, c1, c1, 0
> @@ -175,7 +175,7 @@ _smc_psci:
> @ Switch back to non-secure
> 2: mcr p15, 0, r7, c1, c1, 0
>
> - pop {r4-r7, lr}
> + pop {r4-r12, lr}
> movs pc, lr @ Return to the kernel
>
> @ Requires dense and single-cluster CPU ID space
> --
> 1.9.1
>
> _______________________________________________
> U-Boot mailing list
> U-Boot@lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
