linux-kernel - Re: [PATCH 07/31] Add debugger entry points for NIOS2

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Message-ID: <CAFiDJ5_kJCQDEo0GYrEmaeuBSMJN4uV+4nvvgsyt1u_M1N20BA@mail.gmail.com>
Date:	Fri, 29 Jan 2016 11:11:24 +0800
From:	Ley Foon Tan <lftan@...era.com>
To:	Jeffrey Merkey <jeffmerkey@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux.mdb@...il.com,
	"nios2-dev@...ts.rocketboards.org" <nios2-dev@...ts.rocketboards.org>
Subject: Re: [PATCH 07/31] Add debugger entry points for NIOS2

On Fri, Jan 29, 2016 at 3:46 AM, Jeffrey Merkey <jeffmerkey@...il.com> wrote:
> This patch series adds an export which can be set by system debuggers to
> direct the hard lockup and soft lockup detector to trigger a breakpoint
> exception and enter a debugger if one is active.  It is assumed that if
> someone sets this variable, then an breakpoint handler of some sort will
> be actively loaded or registered via the notify die handler chain.
>
> This addition is extremely useful for debugging hard and soft lockups
> real time and quickly from a console debugger.
>
> Signed-off-by: Jeffrey Merkey <jeffmerkey@...il.com>
> ---
>  arch/nios2/include/asm/kdebug.h | 5 +++++
>  1 file changed, 5 insertions(+)
>  create mode 100644 arch/nios2/include/asm/kdebug.h
>
> diff --git a/arch/nios2/include/asm/kdebug.h b/arch/nios2/include/asm/kdebug.h
> new file mode 100644
> index 0000000..d5d9957
> --- /dev/null
> +++ b/arch/nios2/include/asm/kdebug.h
> @@ -0,0 +1,5 @@
> +
> +static inline void arch_breakpoint(void)
> +{
> +       __asm__ __volatile__("trap 30\n");
> +}
> --
Hi Jeffrey

We already have similar function in arch/nios2/include/asm/kgdb.h. Can
we reuse this?

static inline void arch_kgdb_breakpoint(void)
{
__asm__ __volatile__("trap 30\n");
}

Regards
Ley Foon