kprobe_example.c (e5451c8f8330e03ad3cfa16048b4daf961af434f) kprobe_example.c (d04659ac94528e9224dbf1aed37dd11dd952cacc)
1/*
2 * NOTE: This example is works on x86 and powerpc.
3 * Here's a sample kernel module showing the use of kprobes to dump a
4 * stack trace and selected registers when _do_fork() is called.
5 *
6 * For more information on theory of operation of kprobes, see
7 * Documentation/kprobes.txt
8 *
9 * You will see the trace data in /var/log/messages and on the console
10 * whenever _do_fork() is invoked to create a new process.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/kprobes.h>
16
1/*
2 * NOTE: This example is works on x86 and powerpc.
3 * Here's a sample kernel module showing the use of kprobes to dump a
4 * stack trace and selected registers when _do_fork() is called.
5 *
6 * For more information on theory of operation of kprobes, see
7 * Documentation/kprobes.txt
8 *
9 * You will see the trace data in /var/log/messages and on the console
10 * whenever _do_fork() is invoked to create a new process.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/kprobes.h>
16
17#define MAX_SYMBOL_LEN 64
18static char symbol[MAX_SYMBOL_LEN] = "_do_fork";
19module_param_string(symbol, symbol, sizeof(symbol), 0644);
20
17/* For each probe you need to allocate a kprobe structure */
18static struct kprobe kp = {
21/* For each probe you need to allocate a kprobe structure */
22static struct kprobe kp = {
19 .symbol_name = "_do_fork",
23 .symbol_name = symbol,
20};
21
22/* kprobe pre_handler: called just before the probed instruction is executed */
23static int handler_pre(struct kprobe *p, struct pt_regs *regs)
24{
25#ifdef CONFIG_X86
26 printk(KERN_INFO "pre_handler: p->addr = 0x%p, ip = %lx,"
27 " flags = 0x%lx\n",

--- 82 unchanged lines hidden --- 		24};
25
26/* kprobe pre_handler: called just before the probed instruction is executed */
27static int handler_pre(struct kprobe *p, struct pt_regs *regs)
28{
29#ifdef CONFIG_X86
30 printk(KERN_INFO "pre_handler: p->addr = 0x%p, ip = %lx,"
31 " flags = 0x%lx\n",

--- 82 unchanged lines hidden ---