projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 8134eb60 MJ |
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 |