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Re: [PATCH] TX49 MFC0 bug workaround

To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Subject: Re: [PATCH] TX49 MFC0 bug workaround
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Thu, 2 Feb 2006 16:38:37 +0000 (GMT)
Cc: linux-mips@linux-mips.org, ralf@linux-mips.org
In-reply-to: <20060203.013401.41198517.anemo@mba.ocn.ne.jp>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20060203.013401.41198517.anemo@mba.ocn.ne.jp>
Sender: linux-mips-bounce@linux-mips.org
On Fri, 3 Feb 2006, Atsushi Nemoto wrote:

> Workaround: mask EXL bit of the result or place a nop before mfc0.
[...]
> @@ -55,8 +56,13 @@ __asm__ (
>       "       di                                                      \n"
>  #else
>       "       mfc0    $1,$12                                          \n"
> +#if TX49XX_MFC0_WAR && defined(MODULE)
> +     "       ori     $1,3                                            \n"
> +     "       xori    $1,3                                            \n"
> +#else
>       "       ori     $1,1                                            \n"
>       "       xori    $1,1                                            \n"
> +#endif
>       "       .set    noreorder                                       \n"
>       "       mtc0    $1,$12                                          \n"
>  #endif

 Hmm, wouldn't that "nop" alternative be simpler?

  Maciej

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