[Qemu-devel] qemu cp15 access

[Qemu-devel] qemu cp15 access

[Raymes Khoury]

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I am having the problem with qemu, as described in the post
http://old.nabble.com/-PATCH:-PR-target-42671--Use-Thumb1-GOT-address-loading-sequence-for--%09Thumb2-td27124497.html
where
accessing cp15 on ARM causes an error:

qemu: fatal: cp15 insn ee1d2f70

R00=00000000 R01=00000000 R02=00000000 R03=00000000
R04=00000000 R05=00000000 R06=400821c4 R07=00000000
R08=00000000 R09=00000000 R10=4008bf0c R11=00000000
R12=4007f6d0 R13=4007f650 R14=4a1bb3c4 R15=4a1bb3cc
PSR=60000010 -ZC- A usr32

According to that post, there are patches which fix this error. Currently I
am running:
qemu-arm version 0.12.2

Is there a newer version of qemu which applies these patches? If not, are
there other workarounds to solve this problem? Are these patches available
to apply myself?

Thanks,
Raymes

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Re: [Qemu-devel] qemu cp15 access

[Loïc Minier]

On Mon, Jul 26, 2010, Raymes Khoury wrote:
> I am having the problem with qemu, as described in the post
> http://old.nabble.com/-PATCH:-PR-target-42671--Use-Thumb1-GOT-address-loading-sequence-for--%09Thumb2-td27124497.html
> where
> accessing cp15 on ARM causes an error:

 See mid 1280086076-20649-1-git-send-email-loic.minier@linaro.org and
 thread

 http://article.gmane.org/gmane.comp.emulators.qemu/77092

-- 
Loïc Minier

Re: [Qemu-devel] qemu cp15 access

[Raymes Khoury]

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That patch did not fix my issue. My problem turned out to be due to TLS
accesses to cp15 not being allowed by qemu in user mode, even though these
are permitted in ARMv6 and above architectures (e.g. see
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0388f/CIHFGFGE.html).
This was corrected by patch: http://patchwork.ozlabs.org/patch/43797/ which
seems to be applied in trunk and will be released in 0.13.0

Thanks.

On Wed, Jul 28, 2010 at 7:23 AM, Loïc Minier <lool@dooz.org> wrote:

> On Mon, Jul 26, 2010, Raymes Khoury wrote:
> > I am having the problem with qemu, as described in the post
> >
> http://old.nabble.com/-PATCH:-PR-target-42671--Use-Thumb1-GOT-address-loading-sequence-for--%09Thumb2-td27124497.html
> > where
> > accessing cp15 on ARM causes an error:
>
>  See mid 1280086076-20649-1-git-send-email-loic.minier@linaro.org and
>  thread
>
>  http://article.gmane.org/gmane.comp.emulators.qemu/77092
>
> --
> Loïc Minier
>
>

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