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TOMOYO Linux Cross Reference
Linux/include/linux/uprobes.h

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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 
 32 struct vm_area_struct;
 33 struct mm_struct;
 34 struct inode;
 35 struct notifier_block;
 36 struct page;
 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 #include <asm/uprobes.h>
 63 
 64 enum 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  */
 74 struct 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 
 96 struct 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 
106 enum rp_check {
107         RP_CHECK_CALL,
108         RP_CHECK_CHAIN_CALL,
109         RP_CHECK_RET,
110 };
111 
112 struct xol_area;
113 
114 struct uprobes_state {
115         struct xol_area         *xol_area;
116 };
117 
118 extern int set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
119 extern int set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
120 extern bool is_swbp_insn(uprobe_opcode_t *insn);
121 extern bool is_trap_insn(uprobe_opcode_t *insn);
122 extern unsigned long uprobe_get_swbp_addr(struct pt_regs *regs);
123 extern unsigned long uprobe_get_trap_addr(struct pt_regs *regs);
124 extern int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
125 extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
126 extern int uprobe_register_refctr(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc);
127 extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
128 extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
129 extern int uprobe_mmap(struct vm_area_struct *vma);
130 extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
131 extern void uprobe_start_dup_mmap(void);
132 extern void uprobe_end_dup_mmap(void);
133 extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
134 extern void uprobe_free_utask(struct task_struct *t);
135 extern void uprobe_copy_process(struct task_struct *t, unsigned long flags);
136 extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
137 extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
138 extern void uprobe_notify_resume(struct pt_regs *regs);
139 extern bool uprobe_deny_signal(void);
140 extern bool arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
141 extern void uprobe_clear_state(struct mm_struct *mm);
142 extern int  arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
143 extern int  arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
144 extern int  arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
145 extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
146 extern int  arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
147 extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
148 extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
149 extern bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx, struct pt_regs *regs);
150 extern bool arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs);
151 extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
152                                          void *src, unsigned long len);
153 #else /* !CONFIG_UPROBES */
154 struct uprobes_state {
155 };
156 
157 #define uprobe_get_trap_addr(regs)      instruction_pointer(regs)
158 
159 static inline int
160 uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
161 {
162         return -ENOSYS;
163 }
164 static inline int uprobe_register_refctr(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc)
165 {
166         return -ENOSYS;
167 }
168 static inline int
169 uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add)
170 {
171         return -ENOSYS;
172 }
173 static inline void
174 uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
175 {
176 }
177 static inline int uprobe_mmap(struct vm_area_struct *vma)
178 {
179         return 0;
180 }
181 static inline void
182 uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
183 {
184 }
185 static inline void uprobe_start_dup_mmap(void)
186 {
187 }
188 static inline void uprobe_end_dup_mmap(void)
189 {
190 }
191 static inline void
192 uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
193 {
194 }
195 static inline void uprobe_notify_resume(struct pt_regs *regs)
196 {
197 }
198 static inline bool uprobe_deny_signal(void)
199 {
200         return false;
201 }
202 static inline void uprobe_free_utask(struct task_struct *t)
203 {
204 }
205 static inline void uprobe_copy_process(struct task_struct *t, unsigned long flags)
206 {
207 }
208 static inline void uprobe_clear_state(struct mm_struct *mm)
209 {
210 }
211 #endif /* !CONFIG_UPROBES */
212 #endif  /* _LINUX_UPROBES_H */
213 

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