projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 149b9a9d YB |
1 | #ifndef _LTTNG_WRAPPER_UPROBES_H |
| 2 | #define _LTTNG_WRAPPER_UPROBES_H | |
| 3 | ||
| 4 | /* | |
| 5 | * wrapper/uprobes.h | |
| 6 | * | |
| 7 | * wrapper around uprobes. Using KALLSYMS to get its address when | |
| 8 | * available, else we need to have a kernel that exports this function to GPL | |
| 9 | * modules. | |
| 10 | * | |
| 11 | * Copyright (C) 2013 Yannick Brosseau <yannick.brosseau@gmail.com> | |
| 12 | * Copyright (C) 2017 Francis Deslauriers <francis.deslauriers@efficios.com> | |
| 13 | * | |
| 14 | * This library is free software; you can redistribute it and/or | |
| 15 | * modify it under the terms of the GNU Lesser General Public | |
| 16 | * License as published by the Free Software Foundation; only | |
| 17 | * version 2.1 of the License. | |
| 18 | * | |
| 19 | * This library is distributed in the hope that it will be useful, | |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 22 | * Lesser General Public License for more details. | |
| 23 | * | |
| 24 | * You should have received a copy of the GNU Lesser General Public | |
| 25 | * License along with this library; if not, write to the Free Software | |
| 26 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 27 | */ | |
| 28 | ||
| 29 | #include <linux/version.h> | |
| 30 | ||
| 31 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)) | |
| 32 | #include <linux/uprobes.h> | |
| 33 | ||
| 34 | /* Use kallsym lookup for version before 3.9. */ | |
| 35 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)) | |
| 36 | ||
| 37 | static inline | |
| 38 | int wrapper_uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
| 39 | { | |
| 40 | return uprobe_register(inode, offset, uc); | |
| 41 | } | |
| 42 | ||
| 43 | static inline | |
| 44 | void wrapper_uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
| 45 | { | |
| 46 | uprobe_unregister(inode, offset, uc); | |
| 47 | } | |
| 48 | ||
| 49 | #else /* Version < 3.9, use kallsym lookup. */ | |
| 50 | #include "kallsyms.h" | |
| 51 | ||
| 52 | static inline | |
| 53 | int wrapper_uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
| 54 | { | |
| 55 | int (*uprobe_register_sym)(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
| 56 | ||
| 57 | uprobe_register_sym = (void *) kallsyms_lookup_funcptr("uprobe_register"); | |
| 58 | ||
| 59 | if (uprobe_register_sym) { | |
| 60 | return uprobe_register_sym(inode, offset, uc); | |
| 61 | } else { | |
| 62 | printk(KERN_WARNING "LTTng: uprobe_register symbol lookup failed.\n"); | |
| 63 | return -EINVAL; | |
| 64 | } | |
| 65 | } | |
| 66 | ||
| 67 | static inline | |
| 68 | void wrapper_uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) | |
| 69 | { | |
| 70 | int (*uprobe_unregister_sym)(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
| 71 | ||
| 72 | uprobe_unregister_sym = (void *) kallsyms_lookup_funcptr("uprobe_unregister"); | |
| 73 | ||
| 74 | if (uprobe_unregister_sym) { | |
| 75 | uprobe_unregister_sym(inode, offset, uc); | |
| 76 | } else { | |
| 77 | printk(KERN_WARNING "LTTng: uprobe_unregister symbol lookup failed.\n"); | |
| 78 | WARN_ON(1); | |
| 79 | } | |
| 80 | } | |
| 81 | #endif | |
| 82 | #else | |
| 83 | /* Version < 3.5, before uprobe was added. */ | |
| 84 | struct uprobe_consumer {}; | |
| 85 | ||
| 86 | #endif | |
| 87 | #endif |