On 01/02/16 15:36, Catalin Marinas wrote:
> On Mon, Feb 01, 2016 at 01:34:16PM +0000, Marc Zyngier wrote:
>> On 01/02/16 13:16, Christoffer Dall wrote:
>>> On Mon, Jan 25, 2016 at 03:53:40PM +0000, Marc Zyngier wrote:
>>>> diff --git a/arch/arm64/kvm/hyp/hyp-entry.S
>>>> b/arch/arm64/kvm/hyp/hyp-entry.S
>>>> index 93e8d983..9e0683f 100644
>>>> --- a/arch/arm64/kvm/hyp/hyp-entry.S
>>>> +++ b/arch/arm64/kvm/hyp/hyp-entry.S
>>>> @@ -38,6 +38,32 @@
>>>> ldp x0, x1, [sp], #16
>>>> .endm
>>>>
>>>> +.macro do_el2_call
>>>> + /*
>>>> + * Shuffle the parameters before calling the function
>>>> + * pointed to in x0. Assumes parameters in x[1,2,3].
>>>> + */
>>>> + stp lr, xzr, [sp, #-16]!
>>>
>>> remind me why this pair isn't just doing "str" instead of "stp" with the
>>> xzr ?
>>
>> Because SP has to be aligned on a 16 bytes boundary at all times.
>
> You could do something like:
>
> sub sp, sp, #16
> str lr, [sp]
>
Ah, fair enough. I'll fold that in.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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