Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

From: Andi Kleen
Date: Fri May 23 2008 - 08:03:42 EST

On Fri, May 23, 2008 at 01:46:25PM +0200, Mikael Pettersson wrote:
> H. Peter Anvin writes:
> > Michael, you wrote:
> >
> > > Hmm, right now it seems this field has a de-facto ABI of being
> > > either 0xffff (plain) or 0x0000 (fxsr). Using other values would
> > > confuse at least one application I know of. Sad.
> >
> > ... could you share what application that is? This otherwise would be
> > ideal.
> It's the virtual machine for the Erlang/OTP concurrent functional
> language. It's open-source and used extensively for telecom and
> internet server applications.

I had a few reports over the years of other applications ddoing very weird
specific things with the sigframe. So I agree it's fairly important
to be as compatible here as possible.

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