1 #ifndef _LINUX_UPROBES_H
2 #define _LINUX_UPROBES_H
4 * User-space Probes (UProbes)
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.
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.
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.
20 * Copyright (C) IBM Corporation, 2008-2012
24 * Copyright (C) 2011-2012 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
27 #include <linux/errno.h>
28 #include <linux/rbtree.h>
30 struct vm_area_struct;
34 #ifdef CONFIG_ARCH_SUPPORTS_UPROBES
35 # include <asm/uprobes.h>
38 struct uprobe_consumer {
39 int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
41 * filter is optional; If a filter exists, handler is run
42 * if and only if filter returns true.
44 bool (*filter)(struct uprobe_consumer *self, struct task_struct *task);
46 struct uprobe_consumer *next;
50 enum uprobe_task_state {
58 * uprobe_task: Metadata of a task while it singlesteps.
61 enum uprobe_task_state state;
62 struct arch_uprobe_task autask;
64 struct uprobe *active_uprobe;
66 unsigned long xol_vaddr;
71 * On a breakpoint hit, thread contests for a slot. It frees the
72 * slot after singlestep. Currently a fixed number of slots are
76 wait_queue_head_t wq; /* if all slots are busy */
77 atomic_t slot_count; /* number of in-use slots */
78 unsigned long *bitmap; /* 0 = free slot */
82 * We keep the vma's vm_start rather than a pointer to the vma
83 * itself. The probed process or a naughty kernel module could make
84 * the vma go away, and we must handle that reasonably gracefully.
86 unsigned long vaddr; /* Page(s) of instruction slots */
89 struct uprobes_state {
90 struct xol_area *xol_area;
93 extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
94 extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
95 extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
96 extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
97 extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
98 extern int uprobe_mmap(struct vm_area_struct *vma);
99 extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
100 extern void uprobe_start_dup_mmap(void);
101 extern void uprobe_end_dup_mmap(void);
102 extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
103 extern void uprobe_free_utask(struct task_struct *t);
104 extern void uprobe_copy_process(struct task_struct *t);
105 extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
106 extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
107 extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
108 extern void uprobe_notify_resume(struct pt_regs *regs);
109 extern bool uprobe_deny_signal(void);
110 extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
111 extern void uprobe_clear_state(struct mm_struct *mm);
112 #else /* !CONFIG_UPROBES */
113 struct uprobes_state {
116 uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
121 uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
124 static inline int uprobe_mmap(struct vm_area_struct *vma)
129 uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
132 static inline void uprobe_start_dup_mmap(void)
135 static inline void uprobe_end_dup_mmap(void)
139 uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
142 static inline void uprobe_notify_resume(struct pt_regs *regs)
145 static inline bool uprobe_deny_signal(void)
149 static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
153 static inline void uprobe_free_utask(struct task_struct *t)
156 static inline void uprobe_copy_process(struct task_struct *t)
159 static inline void uprobe_clear_state(struct mm_struct *mm)
162 #endif /* !CONFIG_UPROBES */
163 #endif /* _LINUX_UPROBES_H */