Re: [PATCH v3 6/7] tcg: implement JIT for iOS and Apple Silicon

[Stefan Hajnoczi]

On Wed, Oct 28, 2020 at 06:04:56PM -0700, Joelle van Dyne wrote:
> Will fix the typo in the commit message.
> 
> Re: "reverse engineered functions", Apple does not provide any
> documentation on their extensions to ARM architecture. APRR is one
> such proprietary feature that is controlled by MRS/MSR writes to an
> undocumented system register. We reverse engineered the functionality
> by tracing how libsystem_pthread.dylib works and replicating the
> MRS/MSR calls.
> 
> More details: https://siguza.github.io/APRR/
> 
> Legally, I don't think this is any different from reverse engineering
> some hardware interface to write a Linux driver but IANAL.

Thanks, I have taken the discussion off-list where we can get advice
regarding this case.

Stefan

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