RFR: JDK-8158502: aarch32: detect QEMU user-mode emulation

[Edward Nevill]

Hi,

Is it possible to use the kernel user helper functions to implement the
required functionality for ldrexd/strexd?

https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt

I am thinking of __kuser_cmpxchg64

Regards,
Ed.

On Wed, 2016-06-08 at 17:41 +0300, Andrey Petushkov wrote:
> Hi Alex,
> 
> Thank you! And you’re seem to be right, ARM1136 seem to be “pure” v6, without extensions brought by v6k. One problem though, it is soft-float as you say. And to my best knowledge our port is not ready for pure soft-float environment. It does not respect soft-float ABI. In addition, I’ve stumbled across one unpleasant problem of missing ldrexd/strext instruction in v6. So I might reconsider support of pure v6, at least for the time being. So please hold off from setting up this machine, until further notice.
> At the same time support for v6k remains my first priority so keep your RPi B+ warmed :)
> (I've finished the detection code and started battle against relocations)
> 
> Regards,
> Andrey
>