linux-kernel - Re: [RFC][PATCH -tip 7/9] tracing: kprobe-tracer plugin supports arguments

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Message-Id: <20090320193030.9D10DFC3AB@magilla.sf.frob.com>
Date:	Fri, 20 Mar 2009 12:30:30 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	ananth@...ibm.com
Cc:	Masami Hiramatsu <mhiramat@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH -tip 7/9] tracing: kprobe-tracer plugin supports 	arguments

> A better option could be to generalize syscall_get_arguments() to work
> for functions other than just syscalls where pt_regs are available.

The syscall register argument passing conventions are disjoint from the
normal function calling ABI on some machines (x86).  You can't conflate them.


Thanks,
Roland

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