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 /* flags that denote/change uprobes behaviour */
40 /* Have a copy of original instruction */
41 #define UPROBE_COPY_INSN 0x1
43 /* Dont run handlers when first register/ last unregister in progress*/
44 #define UPROBE_RUN_HANDLER 0x2
45 /* Can skip singlestep */
46 #define UPROBE_SKIP_SSTEP 0x4
48 struct uprobe_consumer
{
49 int (*handler
)(struct uprobe_consumer
*self
, struct pt_regs
*regs
);
51 * filter is optional; If a filter exists, handler is run
52 * if and only if filter returns true.
54 bool (*filter
)(struct uprobe_consumer
*self
, struct task_struct
*task
);
56 struct uprobe_consumer
*next
;
60 enum uprobe_task_state
{
69 * uprobe_task: Metadata of a task while it singlesteps.
72 enum uprobe_task_state state
;
73 struct arch_uprobe_task autask
;
75 struct uprobe
*active_uprobe
;
77 unsigned long xol_vaddr
;
82 * On a breakpoint hit, thread contests for a slot. It frees the
83 * slot after singlestep. Currently a fixed number of slots are
87 wait_queue_head_t wq
; /* if all slots are busy */
88 atomic_t slot_count
; /* number of in-use slots */
89 unsigned long *bitmap
; /* 0 = free slot */
93 * We keep the vma's vm_start rather than a pointer to the vma
94 * itself. The probed process or a naughty kernel module could make
95 * the vma go away, and we must handle that reasonably gracefully.
97 unsigned long vaddr
; /* Page(s) of instruction slots */
100 struct uprobes_state
{
101 struct xol_area
*xol_area
;
104 extern int __weak
set_swbp(struct arch_uprobe
*aup
, struct mm_struct
*mm
, unsigned long vaddr
);
105 extern int __weak
set_orig_insn(struct arch_uprobe
*aup
, struct mm_struct
*mm
, unsigned long vaddr
);
106 extern bool __weak
is_swbp_insn(uprobe_opcode_t
*insn
);
107 extern int uprobe_register(struct inode
*inode
, loff_t offset
, struct uprobe_consumer
*uc
);
108 extern void uprobe_unregister(struct inode
*inode
, loff_t offset
, struct uprobe_consumer
*uc
);
109 extern int uprobe_mmap(struct vm_area_struct
*vma
);
110 extern void uprobe_munmap(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
);
111 extern void uprobe_dup_mmap(struct mm_struct
*oldmm
, struct mm_struct
*newmm
);
112 extern void uprobe_free_utask(struct task_struct
*t
);
113 extern void uprobe_copy_process(struct task_struct
*t
);
114 extern unsigned long __weak
uprobe_get_swbp_addr(struct pt_regs
*regs
);
115 extern void __weak
arch_uprobe_enable_step(struct arch_uprobe
*arch
);
116 extern void __weak
arch_uprobe_disable_step(struct arch_uprobe
*arch
);
117 extern int uprobe_post_sstep_notifier(struct pt_regs
*regs
);
118 extern int uprobe_pre_sstep_notifier(struct pt_regs
*regs
);
119 extern void uprobe_notify_resume(struct pt_regs
*regs
);
120 extern bool uprobe_deny_signal(void);
121 extern bool __weak
arch_uprobe_skip_sstep(struct arch_uprobe
*aup
, struct pt_regs
*regs
);
122 extern void uprobe_clear_state(struct mm_struct
*mm
);
123 #else /* !CONFIG_UPROBES */
124 struct uprobes_state
{
127 uprobe_register(struct inode
*inode
, loff_t offset
, struct uprobe_consumer
*uc
)
132 uprobe_unregister(struct inode
*inode
, loff_t offset
, struct uprobe_consumer
*uc
)
135 static inline int uprobe_mmap(struct vm_area_struct
*vma
)
140 uprobe_munmap(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
)
144 uprobe_dup_mmap(struct mm_struct
*oldmm
, struct mm_struct
*newmm
)
147 static inline void uprobe_notify_resume(struct pt_regs
*regs
)
150 static inline bool uprobe_deny_signal(void)
154 static inline unsigned long uprobe_get_swbp_addr(struct pt_regs
*regs
)
158 static inline void uprobe_free_utask(struct task_struct
*t
)
161 static inline void uprobe_copy_process(struct task_struct
*t
)
164 static inline void uprobe_clear_state(struct mm_struct
*mm
)
167 #endif /* !CONFIG_UPROBES */
168 #endif /* _LINUX_UPROBES_H */
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