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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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