Re: Aarch64-qemu

["Alex Bennée" <alex.bennee@linaro.org>]

Wissem Yahiaoui <wissem.yahiaouii@gmail.com> writes:

> Hi Peter & Qemu Team,
>
>
> Actually, I also tried it after you send me the documentation. but it will
> be also an segmentation fault. Here, it a screenshot on how I did use
> it.

Please just use inline text. Screenshots for text output or test cases
is just a pain to copy/transcribe.

>
>
> Thanks,
>
> On Wed, 6 Nov 2019 at 12:55, Peter Maydell <peter.maydell@linaro.org> wrote:
>
>> On Wed, 6 Nov 2019 at 11:44, Wissem Yahiaoui <wissem.yahiaouii@gmail.com>
>> wrote:
>> >
>> > Hi Qemu team,
>> >
>> > As I sent you in the first email, that the SVE specific registers in
>> aarch64-qemu results an core dumped/segmentation fault. I Tried the
>> ZCR_EL1, ZCR_EL2 and ZCR_EL12, it compiles fine with the gnu toolchain, but
>> it doesn't run in qemu. I need to simulate the length check at run-time, I
>> am using Qemu but apparently I am missing some step/s.
>>
>> You need to use the prctl() that I suggested, you cannot directly
>> access any of those registers from userspace. If you have a
>> simple test program which tries to use the prctl() but does not
>> work then I can have a look at what is going wrong.
>>
>> thanks
>> -- PMM
>>


--
Alex Bennée