linux-mips
[Top] [All Lists]

Re: [PATCH] MIPS: Print correct PC in trace dump after NMI exception

To: Markos Chandras <markos.chandras@imgtec.com>
Subject: Re: [PATCH] MIPS: Print correct PC in trace dump after NMI exception
From: Ralf Baechle <ralf@linux-mips.org>
Date: Tue, 8 Oct 2013 14:15:46 +0200
Cc: linux-mips@linux-mips.org, Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
In-reply-to: <1381232371-25017-1-git-send-email-markos.chandras@imgtec.com>
List-archive: <http://www.linux-mips.org/archives/linux-mips/>
List-help: <mailto:ecartis@linux-mips.org?Subject=help>
List-id: linux-mips <linux-mips.eddie.linux-mips.org>
List-owner: <mailto:ralf@linux-mips.org>
List-post: <mailto:linux-mips@linux-mips.org>
List-software: Ecartis version 1.0.0
List-subscribe: <mailto:ecartis@linux-mips.org?subject=subscribe%20linux-mips>
List-unsubscribe: <mailto:ecartis@linux-mips.org?subject=unsubscribe%20linux-mips>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1381232371-25017-1-git-send-email-markos.chandras@imgtec.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Oct 08, 2013 at 12:39:31PM +0100, Markos Chandras wrote:

> +     /*
> +      * Clear ERL - restore segment mapping
> +      * Clear BEV - required for page fault exception handler to work
> +      */
> +     mfc0    k0, CP0_STATUS
> +     ori     k0, k0, ST0_EXL
> +     lui     k1, %hi(~ST0_BEV)
> +     ori     k1, k1, %lo(~ST0_ERL)

Why not:

        li      k1 ~(ST0_BEV | ST0_ERL)

If you were afraid gas might use $1 expanding this macro instruction - no,
it won't.  A belt & suspenders approach might be to drop in a ".set noat";
it would make the assembler throw an error if should ever see the need to
use $1.

  Ralf

<Prev in Thread] Current Thread [Next in Thread>