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b06457c8 SRV |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | #include <linux/module.h> | |
3 | ||
4 | #include <linux/sched.h> /* for wake_up_process() */ | |
5 | #include <linux/ftrace.h> | |
6 | ||
7 | void my_direct_func(struct task_struct *p) | |
8 | { | |
760f8bc7 | 9 | trace_printk("waking up %s-%d\n", p->comm, p->pid); |
b06457c8 SRV |
10 | } |
11 | ||
12 | extern void my_tramp(void *); | |
13 | ||
14 | asm ( | |
15 | " .pushsection .text, \"ax\", @progbits\n" | |
9d907f1a | 16 | " .type my_tramp, @function\n" |
983df5f2 | 17 | " .globl my_tramp\n" |
b06457c8 SRV |
18 | " my_tramp:" |
19 | " pushq %rbp\n" | |
20 | " movq %rsp, %rbp\n" | |
21 | " pushq %rdi\n" | |
22 | " call my_direct_func\n" | |
23 | " popq %rdi\n" | |
24 | " leave\n" | |
25 | " ret\n" | |
9d907f1a | 26 | " .size my_tramp, .-my_tramp\n" |
b06457c8 SRV |
27 | " .popsection\n" |
28 | ); | |
29 | ||
30 | ||
31 | static int __init ftrace_direct_init(void) | |
32 | { | |
33 | return register_ftrace_direct((unsigned long)wake_up_process, | |
34 | (unsigned long)my_tramp); | |
35 | } | |
36 | ||
37 | static void __exit ftrace_direct_exit(void) | |
38 | { | |
39 | unregister_ftrace_direct((unsigned long)wake_up_process, | |
40 | (unsigned long)my_tramp); | |
41 | } | |
42 | ||
43 | module_init(ftrace_direct_init); | |
44 | module_exit(ftrace_direct_exit); | |
45 | ||
46 | MODULE_AUTHOR("Steven Rostedt"); | |
47 | MODULE_DESCRIPTION("Example use case of using register_ftrace_direct()"); | |
48 | MODULE_LICENSE("GPL"); |