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Date:	Mon, 6 Oct 2014 20:05:14 -0400
From:	Rich Felker <dalias@...c.org>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	David Daney <ddaney.cavm@...il.com>, libc-alpha@...rceware.org,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH resend] MIPS: Allow FPU emulator to use non-stack area.

On Mon, Oct 06, 2014 at 04:48:52PM -0700, David Daney wrote:
> On 10/06/2014 04:38 PM, Andy Lutomirski wrote:
> >On 10/06/2014 02:58 PM, Rich Felker wrote:
> >>On Mon, Oct 06, 2014 at 02:45:29PM -0700, David Daney wrote:
> [...]
> >>This is a huge ill-designed mess.
> >
> >Amen.
> >
> >Can the kernel not just emulate the instructions directly?
> 
> In theory it could, but since there can be implementation defined
> instructions, there is no way to achieve full instruction set
> coverage for all possible machines.

Is the issue really implementation-defined instructions with delay
slots? If so it sounds like a made-up issue. They're not going to
occur in real binaries. Certainly a compiler is not going to generate
implementation-defined instructions, and if you're writing the asm by
hand, you just don't put floating point instructions in the delay
slot.

Rich
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