linux-kernel - Re: [PATCH] Linux Kernel Markers 0.2 for Linux 2.6.17

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Date:	Wed, 20 Sep 2006 13:14:13 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Karim Yaghmour <karim@...rsys.com>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Douglas Niehaus <niehaus@...s.ku.edu>,
	Tom Zanussi <zanussi@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>, Jes Sorensen <jes@....com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	William Cohen <wcohen@...hat.com>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	systemtap@...rces.redhat.com, ltt-dev@...fik.org
Subject: Re: [PATCH] Linux Kernel Markers 0.2 for Linux 2.6.17

And here is the sample module to use my jump-marker symbols :

(yes, it works!)

Adresses are taken by hand from /proc/kallsyms for now.

---BEGIN---

/* test-mark.c
 *
 */

#include <linux/marker.h>
#include <linux/module.h>

static void **__mark_subsys_mark1_call = (void**)0xf887580c;
static void **__mark_subsys_mark1_jump_over = (void**)0xf8875814;
static void **__mark_subsys_mark1_jump_call = (void*)0xf8875810;
static void *__this_mark_empty_function = (void*)0xf8875000;

static void *saved_over;

void do_mark1(const char *format, int value)
{
	printk("value is %d\n", value);
}

int init_module(void)
{
	*__mark_subsys_mark1_call = (void*)do_mark1;
	saved_over = *__mark_subsys_mark1_jump_over;
	*__mark_subsys_mark1_jump_over = *__mark_subsys_mark1_jump_call;

	return 0;
}

void cleanup_module(void)
{
	*__mark_subsys_mark1_jump_over = saved_over;
	*__mark_subsys_mark1_call = __this_mark_empty_function;
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Marker Test");

---END---




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