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1 | #ifndef _LINUX_UPROBES_H |
2 | #define _LINUX_UPROBES_H | |
3 | /* | |
7b2d81d4 | 4 | * User-space Probes (UProbes) |
2b144498 SD |
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 | * | |
35aa621b | 20 | * Copyright (C) IBM Corporation, 2008-2012 |
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21 | * Authors: |
22 | * Srikar Dronamraju | |
23 | * Jim Keniston | |
35aa621b | 24 | * Copyright (C) 2011-2012 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> |
2b144498 SD |
25 | */ |
26 | ||
27 | #include <linux/errno.h> | |
28 | #include <linux/rbtree.h> | |
29 | ||
30 | struct vm_area_struct; | |
d4b3b638 SD |
31 | struct mm_struct; |
32 | struct inode; | |
0326f5a9 | 33 | |
2b144498 | 34 | #ifdef CONFIG_ARCH_SUPPORTS_UPROBES |
0326f5a9 | 35 | # include <asm/uprobes.h> |
2b144498 SD |
36 | #endif |
37 | ||
2b144498 SD |
38 | struct uprobe_consumer { |
39 | int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs); | |
2b144498 SD |
40 | |
41 | struct uprobe_consumer *next; | |
42 | }; | |
43 | ||
2b144498 | 44 | #ifdef CONFIG_UPROBES |
0326f5a9 SD |
45 | enum uprobe_task_state { |
46 | UTASK_RUNNING, | |
0326f5a9 SD |
47 | UTASK_SSTEP, |
48 | UTASK_SSTEP_ACK, | |
49 | UTASK_SSTEP_TRAPPED, | |
50 | }; | |
51 | ||
52 | /* | |
53 | * uprobe_task: Metadata of a task while it singlesteps. | |
54 | */ | |
55 | struct uprobe_task { | |
56 | enum uprobe_task_state state; | |
57 | struct arch_uprobe_task autask; | |
58 | ||
59 | struct uprobe *active_uprobe; | |
60 | ||
61 | unsigned long xol_vaddr; | |
62 | unsigned long vaddr; | |
63 | }; | |
64 | ||
d4b3b638 SD |
65 | /* |
66 | * On a breakpoint hit, thread contests for a slot. It frees the | |
67 | * slot after singlestep. Currently a fixed number of slots are | |
68 | * allocated. | |
69 | */ | |
70 | struct xol_area { | |
71 | wait_queue_head_t wq; /* if all slots are busy */ | |
72 | atomic_t slot_count; /* number of in-use slots */ | |
73 | unsigned long *bitmap; /* 0 = free slot */ | |
74 | struct page *page; | |
75 | ||
76 | /* | |
77 | * We keep the vma's vm_start rather than a pointer to the vma | |
78 | * itself. The probed process or a naughty kernel module could make | |
79 | * the vma go away, and we must handle that reasonably gracefully. | |
80 | */ | |
81 | unsigned long vaddr; /* Page(s) of instruction slots */ | |
82 | }; | |
83 | ||
84 | struct uprobes_state { | |
85 | struct xol_area *xol_area; | |
86 | }; | |
647c42df | 87 | |
5cb4ac3a | 88 | extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr); |
ded86e7c | 89 | extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr); |
5cb4ac3a | 90 | extern bool __weak is_swbp_insn(uprobe_opcode_t *insn); |
e3343e6a SD |
91 | extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); |
92 | extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); | |
7b2d81d4 | 93 | extern int uprobe_mmap(struct vm_area_struct *vma); |
cbc91f71 | 94 | extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end); |
32cdba1e ON |
95 | extern void uprobe_start_dup_mmap(void); |
96 | extern void uprobe_end_dup_mmap(void); | |
f8ac4ec9 | 97 | extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm); |
0326f5a9 SD |
98 | extern void uprobe_free_utask(struct task_struct *t); |
99 | extern void uprobe_copy_process(struct task_struct *t); | |
100 | extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs); | |
101 | extern int uprobe_post_sstep_notifier(struct pt_regs *regs); | |
102 | extern int uprobe_pre_sstep_notifier(struct pt_regs *regs); | |
103 | extern void uprobe_notify_resume(struct pt_regs *regs); | |
104 | extern bool uprobe_deny_signal(void); | |
105 | extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs); | |
d4b3b638 | 106 | extern void uprobe_clear_state(struct mm_struct *mm); |
0326f5a9 | 107 | #else /* !CONFIG_UPROBES */ |
d4b3b638 SD |
108 | struct uprobes_state { |
109 | }; | |
7b2d81d4 | 110 | static inline int |
e3343e6a | 111 | uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) |
2b144498 SD |
112 | { |
113 | return -ENOSYS; | |
114 | } | |
7b2d81d4 | 115 | static inline void |
e3343e6a | 116 | uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) |
2b144498 SD |
117 | { |
118 | } | |
7b2d81d4 | 119 | static inline int uprobe_mmap(struct vm_area_struct *vma) |
2b144498 SD |
120 | { |
121 | return 0; | |
122 | } | |
cbc91f71 SD |
123 | static inline void |
124 | uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
682968e0 SD |
125 | { |
126 | } | |
32cdba1e ON |
127 | static inline void uprobe_start_dup_mmap(void) |
128 | { | |
129 | } | |
130 | static inline void uprobe_end_dup_mmap(void) | |
131 | { | |
132 | } | |
f8ac4ec9 ON |
133 | static inline void |
134 | uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm) | |
135 | { | |
136 | } | |
0326f5a9 SD |
137 | static inline void uprobe_notify_resume(struct pt_regs *regs) |
138 | { | |
139 | } | |
140 | static inline bool uprobe_deny_signal(void) | |
141 | { | |
142 | return false; | |
143 | } | |
144 | static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs) | |
145 | { | |
146 | return 0; | |
147 | } | |
148 | static inline void uprobe_free_utask(struct task_struct *t) | |
149 | { | |
150 | } | |
151 | static inline void uprobe_copy_process(struct task_struct *t) | |
152 | { | |
153 | } | |
d4b3b638 SD |
154 | static inline void uprobe_clear_state(struct mm_struct *mm) |
155 | { | |
156 | } | |
0326f5a9 | 157 | #endif /* !CONFIG_UPROBES */ |
2b144498 | 158 | #endif /* _LINUX_UPROBES_H */ |