linux-kernel - Re: [PATCH -tip 3/4 V3] tracing: kprobe-tracer plugin supports arguments

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Message-ID: <49CD3507.3080409@redhat.com>
Date:	Fri, 27 Mar 2009 16:20:23 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -tip 3/4 V3] tracing: kprobe-tracer plugin supports	arguments

Frederic Weisbecker wrote:
>>> Anyway both would be handy:
>>>
>>> rp: current ip
>>> ra: return address
>> current ip can be fetched by 'r12' on i386 ('r16' on x86-64).
>> (hmm, we'd better support %ip, %ax, etc.)
>>
> 
> 
> Yes, as an example, I'm currently unable to tell you
> which number is esi :)

Agreed. But I doubt that we can implement it before moving
fetch_* APIs into arch/ directory, can we?


Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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