Re: [PATCH] coroutine: add libucontext as external library

[Daniel P . Berrangé]

On Mon, Mar 08, 2021 at 07:26:36PM -0800, Joelle van Dyne wrote:
> iOS does not support ucontext natively for aarch64 and the sigaltstack is
> also unsupported (even worse, it fails silently, see:
> https://openradar.appspot.com/13002712 )
> 
> As a workaround we include a library implementation of ucontext and add it
> as a build option.

The README here:

  https://github.com/kaniini/libucontext

indicates that it is intentionally limiting what registers it saves
and restores, explicitly excluding FPU.

Peter & Paolo expressed concern about this, indicating FPU reg support
was a requirement for QEMU:

   https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05525.html

Regards,
Daniel
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