linux-kernel - Re: Immediate values

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Message-ID: <20090925110206.50ab8a20@lxorguk.ukuu.org.uk>
Date:	Fri, 25 Sep 2009 11:02:06 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Jason Baron <jbaron@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Prasanna S Panchamukhi <prasanna@...ibm.com>,
	Rusty Lynch <rusty.lynch@...el.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Vamsi Krishna S <vamsi_krishna@...ibm.com>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Nathan Sidwell <nathan@...esourcery.com>,
	Dominique Toupin <dominique.toupin@...csson.com>,
	Anton Massoud <anton.massoud@...csson.com>,
	Richard J Moore <richardj_moore@...ibm.com>
Subject: Re: Immediate values

> Then, following your advice, kprobes should be re-designed to do a
> stop_machine around the int3 breakpoint insertion ? And gdb
> should be stopping all threads of a target process before inserting a
> breakpoint. Therefore, I do not seem to be the only one confused about
> Intel statement on this issue.

There was considerable discussion abut this when the kprobe stuff went
in. If I remember rightly it was stated by someone @intel.com then that
int3 was ok (even though its not strictly documented as such). The same
is not true for all instructions on all x86 processors unfortunately.

Alan
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