linux-kernel - Re: [PATCH v3 2.6.39-rc1-tip 13/26] 13: uprobes: get the breakpoint address.

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Date:	Mon, 18 Apr 2011 18:47:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 2.6.39-rc1-tip 13/26] 13: uprobes: get the
 breakpoint address.

On Fri, 2011-04-01 at 20:05 +0530, Srikar Dronamraju wrote:
> +/**
> + * uprobes_get_bkpt_addr - compute address of bkpt given post-bkpt regs
> + * @regs: Reflects the saved state of the task after it has hit a breakpoint
> + * instruction.
> + * Return the address of the breakpoint instruction.
> + */
> +unsigned long uprobes_get_bkpt_addr(struct pt_regs *regs)
> +{
> +       return instruction_pointer(regs) - UPROBES_BKPT_INSN_SIZE;
> +} 

This assumes the breakpoint instruction is trap like, not fault like, is
that true for all architectures?
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