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uprobes: Add uprobe_task->dup_xol_work/dup_xol_addr
[deliverable/linux.git] / include / linux / uprobes.h
CommitLineData
2b144498
SD		 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
2b144498
SD		 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>
32473431 29#include <linux/types.h>
2b144498
SD		 30
31struct vm_area_struct;
d4b3b638
SD		 32struct mm_struct;
33struct inode;
3820b4d2 34struct notifier_block;
0326f5a9 35
2b144498 36#ifdef CONFIG_ARCH_SUPPORTS_UPROBES
0326f5a9 37# include <asm/uprobes.h>
2b144498
SD		 38#endif
39
da1816b1
ON		 40#define UPROBE_HANDLER_REMOVE 1
41#define UPROBE_HANDLER_MASK 1
42
ded49c55
AA		 43#define MAX_URETPROBE_DEPTH 64
44
8a7f2fa0
ON		 45enum uprobe_filter_ctx {
46 UPROBE_FILTER_REGISTER,
47 UPROBE_FILTER_UNREGISTER,
48 UPROBE_FILTER_MMAP,
49};
50
2b144498
SD		 51struct uprobe_consumer {
52 int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
ea024870
AA		 53 int (*ret_handler)(struct uprobe_consumer *self,
54 unsigned long func,
55 struct pt_regs *regs);
8a7f2fa0
ON		 56 bool (*filter)(struct uprobe_consumer *self,
57 enum uprobe_filter_ctx ctx,
58 struct mm_struct *mm);
2b144498
SD		 59
60 struct uprobe_consumer *next;
61};
62
2b144498 63#ifdef CONFIG_UPROBES
0326f5a9
SD		 64enum uprobe_task_state {
65 UTASK_RUNNING,
0326f5a9
SD		 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;
0326f5a9 76
32473431
ON		 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 };
0326f5a9 88
32473431 89 struct uprobe *active_uprobe;
0326f5a9 90 unsigned long xol_vaddr;
32473431
ON		 91
92 struct return_instance *return_instances;
93 unsigned int depth;
0326f5a9
SD		 94};
95
d4b3b638
SD		 96/*
97 * On a breakpoint hit, thread contests for a slot. It frees the
98 * slot after singlestep. Currently a fixed number of slots are
99 * allocated.
100 */
101struct xol_area {
102 wait_queue_head_t wq; /* if all slots are busy */
103 atomic_t slot_count; /* number of in-use slots */
104 unsigned long *bitmap; /* 0 = free slot */
105 struct page *page;
106
107 /*
108 * We keep the vma's vm_start rather than a pointer to the vma
109 * itself. The probed process or a naughty kernel module could make
110 * the vma go away, and we must handle that reasonably gracefully.
111 */
112 unsigned long vaddr; /* Page(s) of instruction slots */
113};
114
115struct uprobes_state {
116 struct xol_area *xol_area;
117};
647c42df 118
5cb4ac3a 119extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
ded86e7c 120extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
5cb4ac3a 121extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
0908ad6e 122extern bool __weak is_trap_insn(uprobe_opcode_t *insn);
f72d41fa 123extern int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
e3343e6a 124extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
bdf8647c 125extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
e3343e6a 126extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
7b2d81d4 127extern int uprobe_mmap(struct vm_area_struct *vma);
cbc91f71 128extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
32cdba1e
ON		 129extern void uprobe_start_dup_mmap(void);
130extern void uprobe_end_dup_mmap(void);
f8ac4ec9 131extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
0326f5a9 132extern void uprobe_free_utask(struct task_struct *t);
3ab67966 133extern void uprobe_copy_process(struct task_struct *t, unsigned long flags);
0326f5a9
SD		 134extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
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);
c2d3f25d 139extern bool arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
d4b3b638 140extern void uprobe_clear_state(struct mm_struct *mm);
3820b4d2
DL		 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);
0326f5a9 148#else /* !CONFIG_UPROBES */
d4b3b638
SD		 149struct uprobes_state {
150};
7b2d81d4 151static inline int
e3343e6a 152uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
2b144498
SD		 153{
154 return -ENOSYS;
155}
bdf8647c
ON		 156static inline int
157uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add)
158{
159 return -ENOSYS;
160}
7b2d81d4 161static inline void
e3343e6a 162uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
2b144498
SD		 163{
164}
7b2d81d4 165static inline int uprobe_mmap(struct vm_area_struct *vma)
2b144498
SD		 166{
167 return 0;
168}
cbc91f71
SD		 169static inline void
170uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
682968e0
SD		 171{
172}
32cdba1e
ON		 173static inline void uprobe_start_dup_mmap(void)
174{
175}
176static inline void uprobe_end_dup_mmap(void)
177{
178}
f8ac4ec9
ON		 179static inline void
180uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
181{
182}
0326f5a9
SD		 183static inline void uprobe_notify_resume(struct pt_regs *regs)
184{
185}
186static inline bool uprobe_deny_signal(void)
187{
188 return false;
189}
190static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
191{
192 return 0;
193}
194static inline void uprobe_free_utask(struct task_struct *t)
195{
196}
3ab67966 197static inline void uprobe_copy_process(struct task_struct *t, unsigned long flags)
0326f5a9
SD		 198{
199}
d4b3b638
SD		 200static inline void uprobe_clear_state(struct mm_struct *mm)
201{
202}
0326f5a9 203#endif /* !CONFIG_UPROBES */
2b144498 204#endif /* _LINUX_UPROBES_H */
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