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Re: [Qemu-devel] [PATCH v3 15/22] target-arm: A64: Forbid ERET to unimpl
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH v3 15/22] target-arm: A64: Forbid ERET to unimplemented ELs |
Date: |
Wed, 21 May 2014 20:06:32 +0100 |
On 19 May 2014 10:22, Edgar E. Iglesias <address@hidden> wrote:
> From: "Edgar E. Iglesias" <address@hidden>
>
> Check for EL2 support before returning to it.
>
> Reviewed-by: Peter Crosthwaite <address@hidden>
> Signed-off-by: Edgar E. Iglesias <address@hidden>
> ---
> target-arm/op_helper.c | 11 +++++------
> 1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
> index a6eedb2..d89755a 100644
> --- a/target-arm/op_helper.c
> +++ b/target-arm/op_helper.c
> @@ -411,12 +411,11 @@ void HELPER(exception_return)(CPUARMState *env)
> env->regs[15] = env->elr_el[1] & ~0x1;
> } else {
> new_el = extract32(spsr, 2, 2);
> - if (new_el > cur_el) {
> - /* Disallow returns to higher ELs than the current one. */
> - goto illegal_return;
> - }
...you just added this if() in the previous patch. Suggest
squashing the two together.
> - if (new_el > 1) {
> - /* Return to unimplemented EL */
> + if (new_el > cur_el
> + || (new_el == 2 && !arm_feature(env, ARM_FEATURE_EL2))) {
> + /* Disallow return to an EL which is unimplemented or higher
> + * than the current one.
> + */
> goto illegal_return;
> }
> if (extract32(spsr, 1, 1)) {
> --
> 1.8.3.2
>
thanks
-- PMM
- [Qemu-devel] [PATCH v3 08/22] target-arm: Add SPSR entries for EL2/HYP and EL3/MON, (continued)
- [Qemu-devel] [PATCH v3 08/22] target-arm: Add SPSR entries for EL2/HYP and EL3/MON, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 09/22] target-arm: A64: Introduce aarch64_banked_spsr_index(), Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 10/22] target-arm: Add a feature flag for EL2, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 11/22] target-arm: Add a feature flag for EL3, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 12/22] target-arm: Register EL2 versions of ELR and SPSR, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 13/22] target-arm: Register EL3 versions of ELR and SPSR, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 14/22] target-arm: A64: Forbid ERET to increase the EL, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 15/22] target-arm: A64: Forbid ERET to unimplemented ELs, Edgar E. Iglesias, 2014/05/19
- Re: [Qemu-devel] [PATCH v3 15/22] target-arm: A64: Forbid ERET to unimplemented ELs,
Peter Maydell <=
- [Qemu-devel] [PATCH v3 16/22] target-arm: A64: Generalize ERET to various ELs, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 17/22] target-arm: A64: Generalize update_spsel for the various ELs, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 18/22] target-arm: Make vbar_write writeback to any CPREG, Edgar E. Iglesias, 2014/05/19
- [Qemu-devel] [PATCH v3 19/22] target-arm: A64: Register VBAR_EL2, Edgar E. Iglesias, 2014/05/19