linux-kernel - Re: [PATCH 30/31] Add debugger entry points for SPARC

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Date:	Thu, 28 Jan 2016 22:33:21 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jeffrey Merkey <jeffmerkey@...il.com>
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	linux.mdb@...il.com, sparclinux@...r.kernel.org
Subject: Re: [PATCH 30/31] Add debugger entry points for SPARC

Hi Jeff.

> +++ b/arch/sparc/include/asm/kdebug.h
> @@ -5,4 +5,9 @@
>  #else
>  #include <asm/kdebug_32.h>
>  #endif
> +
> +static inline void arch_breakpoint(void)
> +{
> +	asm("ta	$0x7d");
> +}
>  #endif
There seems to be some debugger infrastructure present already for kgdb,
but I assume this cannot be used.
Anyway - trap 0x7d is a debugger trap in sparc32.
If CONFIG_KGDB is not defined then 0x7d is just a regular BAD_TRAP.

For sparc64 trap 0x7d is something different.
I did not conclude what was the right choice for neither.

	Sam