linux-kernel - Re: [PATCH] x86/math-emu: Add support for FCMOVcc and F[U]COMI[P] insns

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Message-ID: <20150822081359.GA10490@gmail.com>
Date:	Sat, 22 Aug 2015 10:13:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86/math-emu: Add support for FCMOVcc and F[U]COMI[P]
 insns


* Denys Vlasenko <dvlasenk@...hat.com> wrote:

> Only compile-tested.
> 
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> CC: Ingo Molnar <mingo@...nel.org>
> CC: Borislav Petkov <bp@...en8.de>
> CC: "H. Peter Anvin" <hpa@...or.com>
> CC: Andy Lutomirski <luto@...capital.net>
> CC: Kees Cook <keescook@...omium.org>
> CC: x86@...nel.org
> CC: linux-kernel@...r.kernel.org
> ---
>  arch/x86/math-emu/fpu_aux.c     |  70 ++++++++++++++++++++++
>  arch/x86/math-emu/fpu_entry.c   |  14 +++--
>  arch/x86/math-emu/fpu_proto.h   |  12 ++++
>  arch/x86/math-emu/reg_compare.c | 128 ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 218 insertions(+), 6 deletions(-)

Very nice!

I tried out this patch (had to fix two math-emu bugs first), but it does not seem 
to make any difference, I still get a SIGILL in FUCOMIP:

  4dd76371:       df e9                   fucomip %st(1),%st

Thanks,

	Ingo
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