linux-kernel - Re: [PATCH resend] MIPS: Allow FPU emulator to use non-stack area.

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Message-ID: <54332A64.5020605@caviumnetworks.com>
Date:	Mon, 6 Oct 2014 16:48:52 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Rich Felker <dalias@...c.org>, 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 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.

>  Can it single-step through them in place?

No.  If it could, we wouldn't be having this informative discussion.


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