| Srikar Dronamraju | 2b14449 | 2012-02-09 14:56:42 +0530 | [diff] [blame^] | 1 | #ifndef _LINUX_UPROBES_H |
| 2 | #define _LINUX_UPROBES_H |
| 3 | /* |
| 4 | * Userspace Probes (UProbes) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | * |
| 20 | * Copyright (C) IBM Corporation, 2008-2011 |
| 21 | * Authors: |
| 22 | * Srikar Dronamraju |
| 23 | * Jim Keniston |
| 24 | */ |
| 25 | |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/rbtree.h> |
| 28 | |
| 29 | struct vm_area_struct; |
| 30 | #ifdef CONFIG_ARCH_SUPPORTS_UPROBES |
| 31 | #include <asm/uprobes.h> |
| 32 | #else |
| 33 | |
| 34 | typedef u8 uprobe_opcode_t; |
| 35 | struct uprobe_arch_info {}; |
| 36 | |
| 37 | #define MAX_UINSN_BYTES 4 |
| 38 | #endif |
| 39 | |
| 40 | #define uprobe_opcode_sz sizeof(uprobe_opcode_t) |
| 41 | |
| 42 | /* flags that denote/change uprobes behaviour */ |
| 43 | /* Have a copy of original instruction */ |
| 44 | #define UPROBES_COPY_INSN 0x1 |
| 45 | /* Dont run handlers when first register/ last unregister in progress*/ |
| 46 | #define UPROBES_RUN_HANDLER 0x2 |
| 47 | |
| 48 | struct uprobe_consumer { |
| 49 | int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs); |
| 50 | /* |
| 51 | * filter is optional; If a filter exists, handler is run |
| 52 | * if and only if filter returns true. |
| 53 | */ |
| 54 | bool (*filter)(struct uprobe_consumer *self, struct task_struct *task); |
| 55 | |
| 56 | struct uprobe_consumer *next; |
| 57 | }; |
| 58 | |
| 59 | struct uprobe { |
| 60 | struct rb_node rb_node; /* node in the rb tree */ |
| 61 | atomic_t ref; |
| 62 | struct rw_semaphore consumer_rwsem; |
| 63 | struct list_head pending_list; |
| 64 | struct uprobe_arch_info arch_info; |
| 65 | struct uprobe_consumer *consumers; |
| 66 | struct inode *inode; /* Also hold a ref to inode */ |
| 67 | loff_t offset; |
| 68 | int flags; |
| 69 | u8 insn[MAX_UINSN_BYTES]; |
| 70 | }; |
| 71 | |
| 72 | #ifdef CONFIG_UPROBES |
| 73 | extern int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, |
| 74 | unsigned long vaddr); |
| 75 | extern int __weak set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, |
| 76 | unsigned long vaddr, bool verify); |
| 77 | extern bool __weak is_bkpt_insn(uprobe_opcode_t *insn); |
| 78 | extern int register_uprobe(struct inode *inode, loff_t offset, |
| 79 | struct uprobe_consumer *consumer); |
| 80 | extern void unregister_uprobe(struct inode *inode, loff_t offset, |
| 81 | struct uprobe_consumer *consumer); |
| 82 | extern int mmap_uprobe(struct vm_area_struct *vma); |
| 83 | #else /* CONFIG_UPROBES is not defined */ |
| 84 | static inline int register_uprobe(struct inode *inode, loff_t offset, |
| 85 | struct uprobe_consumer *consumer) |
| 86 | { |
| 87 | return -ENOSYS; |
| 88 | } |
| 89 | static inline void unregister_uprobe(struct inode *inode, loff_t offset, |
| 90 | struct uprobe_consumer *consumer) |
| 91 | { |
| 92 | } |
| 93 | static inline int mmap_uprobe(struct vm_area_struct *vma) |
| 94 | { |
| 95 | return 0; |
| 96 | } |
| 97 | #endif /* CONFIG_UPROBES */ |
| 98 | #endif /* _LINUX_UPROBES_H */ |