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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
25 */
26
27#include <linux/errno.h>
28#include <linux/rbtree.h>
29#include <linux/types.h>
30#include <linux/wait.h>
31
32struct vm_area_struct;
33struct mm_struct;
34struct inode;
35struct notifier_block;
36struct page;
37
38#define UPROBE_HANDLER_REMOVE 1
39#define UPROBE_HANDLER_MASK 1
40
41#define MAX_URETPROBE_DEPTH 64
42
43enum uprobe_filter_ctx {
44 UPROBE_FILTER_REGISTER,
45 UPROBE_FILTER_UNREGISTER,
46 UPROBE_FILTER_MMAP,
47};
48
49struct 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#include <asm/uprobes.h>
63
64enum uprobe_task_state {
65 UTASK_RUNNING,
66 UTASK_SSTEP,
67 UTASK_SSTEP_ACK,
68 UTASK_SSTEP_TRAPPED,
69};
70
71/*
72 * uprobe_task: Metadata of a task while it singlesteps.
73 */
74struct uprobe_task {
75 enum uprobe_task_state state;
76
77 union {
78 struct {
79 struct arch_uprobe_task autask;
80 unsigned long vaddr;
81 };
82
83 struct {
84 struct callback_head dup_xol_work;
85 unsigned long dup_xol_addr;
86 };
87 };
88
89 struct uprobe *active_uprobe;
90 unsigned long xol_vaddr;
91
92 struct return_instance *return_instances;
93 unsigned int depth;
94};
95
96struct return_instance {
97 struct uprobe *uprobe;
98 unsigned long func;
99 unsigned long stack; /* stack pointer */
100 unsigned long orig_ret_vaddr; /* original return address */
101 bool chained; /* true, if instance is nested */
102
103 struct return_instance *next; /* keep as stack */
104};
105
106enum rp_check {
107 RP_CHECK_CALL,
108 RP_CHECK_CHAIN_CALL,
109 RP_CHECK_RET,
110};
111
112struct xol_area;
113
114struct uprobes_state {
115 struct xol_area *xol_area;
116};
117
118extern int set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
119extern int set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
120extern bool is_swbp_insn(uprobe_opcode_t *insn);
121extern bool is_trap_insn(uprobe_opcode_t *insn);
122extern unsigned long uprobe_get_swbp_addr(struct pt_regs *regs);
123extern unsigned long uprobe_get_trap_addr(struct pt_regs *regs);
124extern int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
125extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
126extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
127extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
128extern int uprobe_mmap(struct vm_area_struct *vma);
129extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
130extern void uprobe_start_dup_mmap(void);
131extern void uprobe_end_dup_mmap(void);
132extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
133extern void uprobe_free_utask(struct task_struct *t);
134extern void uprobe_copy_process(struct task_struct *t, unsigned long flags);
135extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
136extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
137extern void uprobe_notify_resume(struct pt_regs *regs);
138extern bool uprobe_deny_signal(void);
139extern bool arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
140extern void uprobe_clear_state(struct mm_struct *mm);
141extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
142extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
143extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
144extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
145extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
146extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
147extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
148extern bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx, struct pt_regs *regs);
149extern bool arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs);
150extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
151 void *src, unsigned long len);
152#else /* !CONFIG_UPROBES */
153struct uprobes_state {
154};
155
156#define uprobe_get_trap_addr(regs) instruction_pointer(regs)
157
158static inline int
159uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
160{
161 return -ENOSYS;
162}
163static inline int
164uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add)
165{
166 return -ENOSYS;
167}
168static inline void
169uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
170{
171}
172static inline int uprobe_mmap(struct vm_area_struct *vma)
173{
174 return 0;
175}
176static inline void
177uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
178{
179}
180static inline void uprobe_start_dup_mmap(void)
181{
182}
183static inline void uprobe_end_dup_mmap(void)
184{
185}
186static inline void
187uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
188{
189}
190static inline void uprobe_notify_resume(struct pt_regs *regs)
191{
192}
193static inline bool uprobe_deny_signal(void)
194{
195 return false;
196}
197static inline void uprobe_free_utask(struct task_struct *t)
198{
199}
200static inline void uprobe_copy_process(struct task_struct *t, unsigned long flags)
201{
202}
203static inline void uprobe_clear_state(struct mm_struct *mm)
204{
205}
206#endif /* !CONFIG_UPROBES */
207#endif /* _LINUX_UPROBES_H */