linux-kernel - Re: [PATCH V9 15/21] csky: Debug and Ptrace GDB

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Message-ID: <20181018031733.GB15088@guoren-Inspiron-7460>
Date:   Thu, 18 Oct 2018 11:17:33 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        David Miller <davem@...emloft.net>,
        gregkh <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rob Herring <robh@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>, c-sky_gcc_upstream@...ky.com
Subject: Re: [PATCH V9 15/21] csky: Debug and Ptrace GDB

On Wed, Oct 17, 2018 at 05:46:56PM +0200, Arnd Bergmann wrote:
> On Tue, Oct 16, 2018 at 5:06 AM Guo Ren <ren_guo@...ky.com> wrote:
> >
> > This patch adds arch ptrace implementation, stack dump and bug.h.
> >
> > Signed-off-by: Guo Ren <ren_guo@...ky.com>
> > Cc: Arnd Bergmann <arnd@...db.de>
> 
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> 
> > diff --git a/arch/csky/include/asm/bug.h b/arch/csky/include/asm/bug.h
> > new file mode 100644
> > index 0000000..bd7b323
> > --- /dev/null
> > +++ b/arch/csky/include/asm/bug.h
> > @@ -0,0 +1,26 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
> > +
> > +#ifndef __ASM_CSKY_BUG_H
> > +#define __ASM_CSKY_BUG_H
> > +
> > +#include <linux/compiler.h>
> > +#include <linux/const.h>
> > +#include <linux/types.h>
> > +
> > +#define BUG()                          \
> > +do {                                   \
> > +       asm volatile ("bkpt\n");        \
> > +       unreachable();                  \
> > +} while (0)
> 
> Since you have a breakpoint instruction, a nice addition might
> be to use that for implementing WARN_ON as well, whenever you
> get around to doing that. It's certainly not required for the initial
> merge.
Thx for remind and I'll improve it next.

Best Regards
 Guo Ren