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1 | #ifndef _LINUX_UPROBES_H |
2 | #define _LINUX_UPROBES_H |
3 | /* |
4 | * User-space 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, 2008-2012 |
21 | * Authors: |
22 | * Srikar Dronamraju |
23 | * Jim Keniston |
24 | * Copyright (C) 2011-2012 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> |
25 | */ |
26 | |
27 | #include <linux/errno.h> |
28 | #include <linux/rbtree.h> |
29 | |
30 | struct vm_area_struct; |
31 | struct mm_struct; |
32 | struct inode; |
33 | |
34 | #ifdef CONFIG_ARCH_SUPPORTS_UPROBES |
35 | # include <asm/uprobes.h> |
36 | #endif |
37 | |
38 | #define UPROBE_HANDLER_REMOVE 1 |
39 | #define UPROBE_HANDLER_MASK 1 |
40 | |
41 | #define MAX_URETPROBE_DEPTH 64 |
42 | |
43 | enum uprobe_filter_ctx { |
44 | UPROBE_FILTER_REGISTER, |
45 | UPROBE_FILTER_UNREGISTER, |
46 | UPROBE_FILTER_MMAP, |
47 | }; |
48 | |
49 | struct uprobe_consumer { |
50 | int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs); |
51 | int (*ret_handler)(struct uprobe_consumer *self, |
52 | unsigned long func, |
53 | struct pt_regs *regs); |
54 | bool (*filter)(struct uprobe_consumer *self, |
55 | enum uprobe_filter_ctx ctx, |
56 | struct mm_struct *mm); |
57 | |
58 | struct uprobe_consumer *next; |
59 | }; |
60 | |
61 | #ifdef CONFIG_UPROBES |
62 | enum uprobe_task_state { |
63 | UTASK_RUNNING, |
64 | UTASK_SSTEP, |
65 | UTASK_SSTEP_ACK, |
66 | UTASK_SSTEP_TRAPPED, |
67 | }; |
68 | |
69 | /* |
70 | * uprobe_task: Metadata of a task while it singlesteps. |
71 | */ |
72 | struct uprobe_task { |
73 | enum uprobe_task_state state; |
74 | struct arch_uprobe_task autask; |
75 | |
76 | struct return_instance *return_instances; |
77 | unsigned int depth; |
78 | struct uprobe *active_uprobe; |
79 | |
80 | unsigned long xol_vaddr; |
81 | unsigned long vaddr; |
82 | }; |
83 | |
84 | /* |
85 | * On a breakpoint hit, thread contests for a slot. It frees the |
86 | * slot after singlestep. Currently a fixed number of slots are |
87 | * allocated. |
88 | */ |
89 | struct xol_area { |
90 | wait_queue_head_t wq; /* if all slots are busy */ |
91 | atomic_t slot_count; /* number of in-use slots */ |
92 | unsigned long *bitmap; /* 0 = free slot */ |
93 | struct page *page; |
94 | |
95 | /* |
96 | * We keep the vma's vm_start rather than a pointer to the vma |
97 | * itself. The probed process or a naughty kernel module could make |
98 | * the vma go away, and we must handle that reasonably gracefully. |
99 | */ |
100 | unsigned long vaddr; /* Page(s) of instruction slots */ |
101 | }; |
102 | |
103 | struct uprobes_state { |
104 | struct xol_area *xol_area; |
105 | }; |
106 | |
107 | extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr); |
108 | extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr); |
109 | extern bool __weak is_swbp_insn(uprobe_opcode_t *insn); |
110 | extern bool __weak is_trap_insn(uprobe_opcode_t *insn); |
111 | extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); |
112 | extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool); |
113 | extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); |
114 | extern int uprobe_mmap(struct vm_area_struct *vma); |
115 | extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end); |
116 | extern void uprobe_start_dup_mmap(void); |
117 | extern void uprobe_end_dup_mmap(void); |
118 | extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm); |
119 | extern void uprobe_free_utask(struct task_struct *t); |
120 | extern void uprobe_copy_process(struct task_struct *t); |
121 | extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs); |
122 | extern int uprobe_post_sstep_notifier(struct pt_regs *regs); |
123 | extern int uprobe_pre_sstep_notifier(struct pt_regs *regs); |
124 | extern void uprobe_notify_resume(struct pt_regs *regs); |
125 | extern bool uprobe_deny_signal(void); |
126 | extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs); |
127 | extern void uprobe_clear_state(struct mm_struct *mm); |
128 | #else /* !CONFIG_UPROBES */ |
129 | struct uprobes_state { |
130 | }; |
131 | static inline int |
132 | uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) |
133 | { |
134 | return -ENOSYS; |
135 | } |
136 | static inline int |
137 | uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add) |
138 | { |
139 | return -ENOSYS; |
140 | } |
141 | static inline void |
142 | uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) |
143 | { |
144 | } |
145 | static inline int uprobe_mmap(struct vm_area_struct *vma) |
146 | { |
147 | return 0; |
148 | } |
149 | static inline void |
150 | uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end) |
151 | { |
152 | } |
153 | static inline void uprobe_start_dup_mmap(void) |
154 | { |
155 | } |
156 | static inline void uprobe_end_dup_mmap(void) |
157 | { |
158 | } |
159 | static inline void |
160 | uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm) |
161 | { |
162 | } |
163 | static inline void uprobe_notify_resume(struct pt_regs *regs) |
164 | { |
165 | } |
166 | static inline bool uprobe_deny_signal(void) |
167 | { |
168 | return false; |
169 | } |
170 | static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs) |
171 | { |
172 | return 0; |
173 | } |
174 | static inline void uprobe_free_utask(struct task_struct *t) |
175 | { |
176 | } |
177 | static inline void uprobe_copy_process(struct task_struct *t) |
178 | { |
179 | } |
180 | static inline void uprobe_clear_state(struct mm_struct *mm) |
181 | { |
182 | } |
183 | #endif /* !CONFIG_UPROBES */ |
184 | #endif /* _LINUX_UPROBES_H */ |
185 |
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