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1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
149b9a9d YB |
3 | * wrapper/uprobes.h |
4 | * | |
5 | * wrapper around uprobes. Using KALLSYMS to get its address when | |
6 | * available, else we need to have a kernel that exports this function to GPL | |
7 | * modules. | |
8 | * | |
9 | * Copyright (C) 2013 Yannick Brosseau <yannick.brosseau@gmail.com> | |
10 | * Copyright (C) 2017 Francis Deslauriers <francis.deslauriers@efficios.com> | |
11 | * | |
149b9a9d YB |
12 | */ |
13 | ||
8134eb60 MJ |
14 | #ifndef _LTTNG_WRAPPER_UPROBES_H |
15 | #define _LTTNG_WRAPPER_UPROBES_H | |
16 | ||
149b9a9d YB |
17 | #include <linux/version.h> |
18 | ||
19 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)) | |
20 | #include <linux/uprobes.h> | |
21 | ||
22 | /* Use kallsym lookup for version before 3.9. */ | |
23 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)) | |
24 | ||
25 | static inline | |
26 | int wrapper_uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
27 | { | |
28 | return uprobe_register(inode, offset, uc); | |
29 | } | |
30 | ||
31 | static inline | |
32 | void wrapper_uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
33 | { | |
34 | uprobe_unregister(inode, offset, uc); | |
35 | } | |
36 | ||
37 | #else /* Version < 3.9, use kallsym lookup. */ | |
38 | #include "kallsyms.h" | |
39 | ||
40 | static inline | |
41 | int wrapper_uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
42 | { | |
43 | int (*uprobe_register_sym)(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
44 | ||
45 | uprobe_register_sym = (void *) kallsyms_lookup_funcptr("uprobe_register"); | |
46 | ||
47 | if (uprobe_register_sym) { | |
48 | return uprobe_register_sym(inode, offset, uc); | |
49 | } else { | |
50 | printk(KERN_WARNING "LTTng: uprobe_register symbol lookup failed.\n"); | |
51 | return -EINVAL; | |
52 | } | |
53 | } | |
54 | ||
55 | static inline | |
56 | void wrapper_uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
57 | { | |
58 | int (*uprobe_unregister_sym)(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
59 | ||
60 | uprobe_unregister_sym = (void *) kallsyms_lookup_funcptr("uprobe_unregister"); | |
61 | ||
62 | if (uprobe_unregister_sym) { | |
63 | uprobe_unregister_sym(inode, offset, uc); | |
64 | } else { | |
65 | printk(KERN_WARNING "LTTng: uprobe_unregister symbol lookup failed.\n"); | |
66 | WARN_ON(1); | |
67 | } | |
68 | } | |
69 | #endif | |
70 | #else | |
71 | /* Version < 3.5, before uprobe was added. */ | |
72 | struct uprobe_consumer {}; | |
73 | ||
74 | #endif | |
75 | #endif |