kprobe_example.c (d04659ac94528e9224dbf1aed37dd11dd952cacc) kprobe_example.c (ea9b50133ffebbd580cb5cd0aa222784d7a2fcb1)
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 *

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22static struct kprobe kp = {
23 .symbol_name = symbol,
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
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 *

--- 13 unchanged lines hidden (view full) ---

22static struct kprobe kp = {
23 .symbol_name = symbol,
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,"
30 printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, ip = %lx,"
31 " flags = 0x%lx\n",
31 " flags = 0x%lx\n",
32 p->addr, regs->ip, regs->flags);
32 p->symbol_name, p->addr, regs->ip, regs->flags);
33#endif
34#ifdef CONFIG_PPC
33#endif
34#ifdef CONFIG_PPC
35 printk(KERN_INFO "pre_handler: p->addr = 0x%p, nip = 0x%lx,"
35 printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, nip = 0x%lx,"
36 " msr = 0x%lx\n",
36 " msr = 0x%lx\n",
37 p->addr, regs->nip, regs->msr);
37 p->symbol_name, p->addr, regs->nip, regs->msr);
38#endif
39#ifdef CONFIG_MIPS
38#endif
39#ifdef CONFIG_MIPS
40 printk(KERN_INFO "pre_handler: p->addr = 0x%p, epc = 0x%lx,"
40 printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, epc = 0x%lx,"
41 " status = 0x%lx\n",
41 " status = 0x%lx\n",
42 p->addr, regs->cp0_epc, regs->cp0_status);
42 p->symbol_name, p->addr, regs->cp0_epc, regs->cp0_status);
43#endif
44#ifdef CONFIG_TILEGX
43#endif
44#ifdef CONFIG_TILEGX
45 printk(KERN_INFO "pre_handler: p->addr = 0x%p, pc = 0x%lx,"
45 printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx,"
46 " ex1 = 0x%lx\n",
46 " ex1 = 0x%lx\n",
47 p->addr, regs->pc, regs->ex1);
47 p->symbol_name, p->addr, regs->pc, regs->ex1);
48#endif
49
50 /* A dump_stack() here will give a stack backtrace */
51 return 0;
52}
53
54/* kprobe post_handler: called after the probed instruction is executed */
55static void handler_post(struct kprobe *p, struct pt_regs *regs,
56 unsigned long flags)
57{
58#ifdef CONFIG_X86
48#endif
49
50 /* A dump_stack() here will give a stack backtrace */
51 return 0;
52}
53
54/* kprobe post_handler: called after the probed instruction is executed */
55static void handler_post(struct kprobe *p, struct pt_regs *regs,
56 unsigned long flags)
57{
58#ifdef CONFIG_X86
59 printk(KERN_INFO "post_handler: p->addr = 0x%p, flags = 0x%lx\n",
60 p->addr, regs->flags);
59 printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, flags = 0x%lx\n",
60 p->symbol_name, p->addr, regs->flags);
61#endif
62#ifdef CONFIG_PPC
61#endif
62#ifdef CONFIG_PPC
63 printk(KERN_INFO "post_handler: p->addr = 0x%p, msr = 0x%lx\n",
64 p->addr, regs->msr);
63 printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, msr = 0x%lx\n",
64 p->symbol_name, p->addr, regs->msr);
65#endif
66#ifdef CONFIG_MIPS
65#endif
66#ifdef CONFIG_MIPS
67 printk(KERN_INFO "post_handler: p->addr = 0x%p, status = 0x%lx\n",
68 p->addr, regs->cp0_status);
67 printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, status = 0x%lx\n",
68 p->symbol_name, p->addr, regs->cp0_status);
69#endif
70#ifdef CONFIG_TILEGX
69#endif
70#ifdef CONFIG_TILEGX
71 printk(KERN_INFO "post_handler: p->addr = 0x%p, ex1 = 0x%lx\n",
72 p->addr, regs->ex1);
71 printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, ex1 = 0x%lx\n",
72 p->symbol_name, p->addr, regs->ex1);
73#endif
74}
75
76/*
77 * fault_handler: this is called if an exception is generated for any
78 * instruction within the pre- or post-handler, or when Kprobes
79 * single-steps the probed instruction.
80 */

--- 33 unchanged lines hidden --- 		73#endif
74}
75
76/*
77 * fault_handler: this is called if an exception is generated for any
78 * instruction within the pre- or post-handler, or when Kprobes
79 * single-steps the probed instruction.
80 */

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