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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 | ||
2d042821 | 17 | #include <lttng-kernel-version.h> |
149b9a9d | 18 | |
2d042821 | 19 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,5,0)) |
149b9a9d YB |
20 | #include <linux/uprobes.h> |
21 | ||
22 | /* Use kallsym lookup for version before 3.9. */ | |
2d042821 | 23 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,9,0)) |
149b9a9d YB |
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 | ||
60c64030 MJ |
55 | /* |
56 | * Canary function to check for 'uprobe_register()' at compile time. | |
57 | * | |
58 | * From 'include/linux/uprobes.h': | |
59 | * | |
60 | * extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
61 | */ | |
62 | static inline | |
63 | int __canary__uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
64 | { | |
65 | return uprobe_register(inode, offset, uc); | |
66 | } | |
67 | ||
149b9a9d YB |
68 | static inline |
69 | void wrapper_uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
70 | { | |
71 | int (*uprobe_unregister_sym)(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
72 | ||
73 | uprobe_unregister_sym = (void *) kallsyms_lookup_funcptr("uprobe_unregister"); | |
74 | ||
75 | if (uprobe_unregister_sym) { | |
76 | uprobe_unregister_sym(inode, offset, uc); | |
77 | } else { | |
78 | printk(KERN_WARNING "LTTng: uprobe_unregister symbol lookup failed.\n"); | |
79 | WARN_ON(1); | |
80 | } | |
81 | } | |
60c64030 MJ |
82 | |
83 | /* | |
84 | * Canary function to check for 'uprobe_unregister()' at compile time. | |
85 | * | |
86 | * From 'include/linux/uprobes.h': | |
87 | * | |
88 | * extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
89 | */ | |
90 | static inline | |
fc38d28e | 91 | void __canary__uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) |
60c64030 | 92 | { |
fc38d28e | 93 | uprobe_unregister(inode, offset, uc); |
60c64030 MJ |
94 | } |
95 | ||
149b9a9d YB |
96 | #endif |
97 | #else | |
98 | /* Version < 3.5, before uprobe was added. */ | |
99 | struct uprobe_consumer {}; | |
100 | ||
101 | #endif | |
102 | #endif |