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Linux/include/linux/kprobes.h

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  1 #ifndef _LINUX_KPROBES_H
  2 #define _LINUX_KPROBES_H
  3 /*
  4  *  Kernel Probes (KProbes)
  5  *  include/linux/kprobes.h
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 20  *
 21  * Copyright (C) IBM Corporation, 2002, 2004
 22  *
 23  * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
 24  *              Probes initial implementation ( includes suggestions from
 25  *              Rusty Russell).
 26  * 2004-July    Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
 27  *              interface to access function arguments.
 28  * 2005-May     Hien Nguyen <hien@us.ibm.com> and Jim Keniston
 29  *              <jkenisto@us.ibm.com>  and Prasanna S Panchamukhi
 30  *              <prasanna@in.ibm.com> added function-return probes.
 31  */
 32 #include <linux/compiler.h>     /* for __kprobes */
 33 #include <linux/linkage.h>
 34 #include <linux/list.h>
 35 #include <linux/notifier.h>
 36 #include <linux/smp.h>
 37 #include <linux/bug.h>
 38 #include <linux/percpu.h>
 39 #include <linux/spinlock.h>
 40 #include <linux/rcupdate.h>
 41 #include <linux/mutex.h>
 42 #include <linux/ftrace.h>
 43 
 44 #ifdef CONFIG_KPROBES
 45 #include <asm/kprobes.h>
 46 
 47 /* kprobe_status settings */
 48 #define KPROBE_HIT_ACTIVE       0x00000001
 49 #define KPROBE_HIT_SS           0x00000002
 50 #define KPROBE_REENTER          0x00000004
 51 #define KPROBE_HIT_SSDONE       0x00000008
 52 
 53 #else /* CONFIG_KPROBES */
 54 typedef int kprobe_opcode_t;
 55 struct arch_specific_insn {
 56         int dummy;
 57 };
 58 #endif /* CONFIG_KPROBES */
 59 
 60 struct kprobe;
 61 struct pt_regs;
 62 struct kretprobe;
 63 struct kretprobe_instance;
 64 typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
 65 typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
 66 typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
 67                                        unsigned long flags);
 68 typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
 69                                        int trapnr);
 70 typedef int (*kretprobe_handler_t) (struct kretprobe_instance *,
 71                                     struct pt_regs *);
 72 
 73 struct kprobe {
 74         struct hlist_node hlist;
 75 
 76         /* list of kprobes for multi-handler support */
 77         struct list_head list;
 78 
 79         /*count the number of times this probe was temporarily disarmed */
 80         unsigned long nmissed;
 81 
 82         /* location of the probe point */
 83         kprobe_opcode_t *addr;
 84 
 85         /* Allow user to indicate symbol name of the probe point */
 86         const char *symbol_name;
 87 
 88         /* Offset into the symbol */
 89         unsigned int offset;
 90 
 91         /* Called before addr is executed. */
 92         kprobe_pre_handler_t pre_handler;
 93 
 94         /* Called after addr is executed, unless... */
 95         kprobe_post_handler_t post_handler;
 96 
 97         /*
 98          * ... called if executing addr causes a fault (eg. page fault).
 99          * Return 1 if it handled fault, otherwise kernel will see it.
100          */
101         kprobe_fault_handler_t fault_handler;
102 
103         /*
104          * ... called if breakpoint trap occurs in probe handler.
105          * Return 1 if it handled break, otherwise kernel will see it.
106          */
107         kprobe_break_handler_t break_handler;
108 
109         /* Saved opcode (which has been replaced with breakpoint) */
110         kprobe_opcode_t opcode;
111 
112         /* copy of the original instruction */
113         struct arch_specific_insn ainsn;
114 
115         /*
116          * Indicates various status flags.
117          * Protected by kprobe_mutex after this kprobe is registered.
118          */
119         u32 flags;
120 };
121 
122 /* Kprobe status flags */
123 #define KPROBE_FLAG_GONE        1 /* breakpoint has already gone */
124 #define KPROBE_FLAG_DISABLED    2 /* probe is temporarily disabled */
125 #define KPROBE_FLAG_OPTIMIZED   4 /*
126                                    * probe is really optimized.
127                                    * NOTE:
128                                    * this flag is only for optimized_kprobe.
129                                    */
130 #define KPROBE_FLAG_FTRACE      8 /* probe is using ftrace */
131 
132 /* Has this kprobe gone ? */
133 static inline int kprobe_gone(struct kprobe *p)
134 {
135         return p->flags & KPROBE_FLAG_GONE;
136 }
137 
138 /* Is this kprobe disabled ? */
139 static inline int kprobe_disabled(struct kprobe *p)
140 {
141         return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE);
142 }
143 
144 /* Is this kprobe really running optimized path ? */
145 static inline int kprobe_optimized(struct kprobe *p)
146 {
147         return p->flags & KPROBE_FLAG_OPTIMIZED;
148 }
149 
150 /* Is this kprobe uses ftrace ? */
151 static inline int kprobe_ftrace(struct kprobe *p)
152 {
153         return p->flags & KPROBE_FLAG_FTRACE;
154 }
155 
156 /*
157  * Special probe type that uses setjmp-longjmp type tricks to resume
158  * execution at a specified entry with a matching prototype corresponding
159  * to the probed function - a trick to enable arguments to become
160  * accessible seamlessly by probe handling logic.
161  * Note:
162  * Because of the way compilers allocate stack space for local variables
163  * etc upfront, regardless of sub-scopes within a function, this mirroring
164  * principle currently works only for probes placed on function entry points.
165  */
166 struct jprobe {
167         struct kprobe kp;
168         void *entry;    /* probe handling code to jump to */
169 };
170 
171 /* For backward compatibility with old code using JPROBE_ENTRY() */
172 #define JPROBE_ENTRY(handler)   (handler)
173 
174 /*
175  * Function-return probe -
176  * Note:
177  * User needs to provide a handler function, and initialize maxactive.
178  * maxactive - The maximum number of instances of the probed function that
179  * can be active concurrently.
180  * nmissed - tracks the number of times the probed function's return was
181  * ignored, due to maxactive being too low.
182  *
183  */
184 struct kretprobe {
185         struct kprobe kp;
186         kretprobe_handler_t handler;
187         kretprobe_handler_t entry_handler;
188         int maxactive;
189         int nmissed;
190         size_t data_size;
191         struct hlist_head free_instances;
192         raw_spinlock_t lock;
193 };
194 
195 struct kretprobe_instance {
196         struct hlist_node hlist;
197         struct kretprobe *rp;
198         kprobe_opcode_t *ret_addr;
199         struct task_struct *task;
200         char data[0];
201 };
202 
203 struct kretprobe_blackpoint {
204         const char *name;
205         void *addr;
206 };
207 
208 struct kprobe_blackpoint {
209         const char *name;
210         unsigned long start_addr;
211         unsigned long range;
212 };
213 
214 #ifdef CONFIG_KPROBES
215 DECLARE_PER_CPU(struct kprobe *, current_kprobe);
216 DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
217 
218 /*
219  * For #ifdef avoidance:
220  */
221 static inline int kprobes_built_in(void)
222 {
223         return 1;
224 }
225 
226 #ifdef CONFIG_KRETPROBES
227 extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
228                                    struct pt_regs *regs);
229 extern int arch_trampoline_kprobe(struct kprobe *p);
230 #else /* CONFIG_KRETPROBES */
231 static inline void arch_prepare_kretprobe(struct kretprobe *rp,
232                                         struct pt_regs *regs)
233 {
234 }
235 static inline int arch_trampoline_kprobe(struct kprobe *p)
236 {
237         return 0;
238 }
239 #endif /* CONFIG_KRETPROBES */
240 
241 extern struct kretprobe_blackpoint kretprobe_blacklist[];
242 
243 static inline void kretprobe_assert(struct kretprobe_instance *ri,
244         unsigned long orig_ret_address, unsigned long trampoline_address)
245 {
246         if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
247                 printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
248                                 ri->rp, ri->rp->kp.addr);
249                 BUG();
250         }
251 }
252 
253 #ifdef CONFIG_KPROBES_SANITY_TEST
254 extern int init_test_probes(void);
255 #else
256 static inline int init_test_probes(void)
257 {
258         return 0;
259 }
260 #endif /* CONFIG_KPROBES_SANITY_TEST */
261 
262 extern int arch_prepare_kprobe(struct kprobe *p);
263 extern void arch_arm_kprobe(struct kprobe *p);
264 extern void arch_disarm_kprobe(struct kprobe *p);
265 extern int arch_init_kprobes(void);
266 extern void show_registers(struct pt_regs *regs);
267 extern kprobe_opcode_t *get_insn_slot(void);
268 extern void free_insn_slot(kprobe_opcode_t *slot, int dirty);
269 extern void kprobes_inc_nmissed_count(struct kprobe *p);
270 
271 #ifdef CONFIG_OPTPROBES
272 /*
273  * Internal structure for direct jump optimized probe
274  */
275 struct optimized_kprobe {
276         struct kprobe kp;
277         struct list_head list;  /* list for optimizing queue */
278         struct arch_optimized_insn optinsn;
279 };
280 
281 /* Architecture dependent functions for direct jump optimization */
282 extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn);
283 extern int arch_check_optimized_kprobe(struct optimized_kprobe *op);
284 extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op);
285 extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
286 extern void arch_optimize_kprobes(struct list_head *oplist);
287 extern void arch_unoptimize_kprobes(struct list_head *oplist,
288                                     struct list_head *done_list);
289 extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
290 extern kprobe_opcode_t *get_optinsn_slot(void);
291 extern void free_optinsn_slot(kprobe_opcode_t *slot, int dirty);
292 extern int arch_within_optimized_kprobe(struct optimized_kprobe *op,
293                                         unsigned long addr);
294 
295 extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs);
296 
297 #ifdef CONFIG_SYSCTL
298 extern int sysctl_kprobes_optimization;
299 extern int proc_kprobes_optimization_handler(struct ctl_table *table,
300                                              int write, void __user *buffer,
301                                              size_t *length, loff_t *ppos);
302 #endif
303 
304 #endif /* CONFIG_OPTPROBES */
305 #ifdef CONFIG_KPROBES_ON_FTRACE
306 extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
307                                   struct ftrace_ops *ops, struct pt_regs *regs);
308 extern int arch_prepare_kprobe_ftrace(struct kprobe *p);
309 #endif
310 
311 
312 /* Get the kprobe at this addr (if any) - called with preemption disabled */
313 struct kprobe *get_kprobe(void *addr);
314 void kretprobe_hash_lock(struct task_struct *tsk,
315                          struct hlist_head **head, unsigned long *flags);
316 void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
317 struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
318 
319 /* kprobe_running() will just return the current_kprobe on this CPU */
320 static inline struct kprobe *kprobe_running(void)
321 {
322         return (__this_cpu_read(current_kprobe));
323 }
324 
325 static inline void reset_current_kprobe(void)
326 {
327         __this_cpu_write(current_kprobe, NULL);
328 }
329 
330 static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
331 {
332         return (&__get_cpu_var(kprobe_ctlblk));
333 }
334 
335 int register_kprobe(struct kprobe *p);
336 void unregister_kprobe(struct kprobe *p);
337 int register_kprobes(struct kprobe **kps, int num);
338 void unregister_kprobes(struct kprobe **kps, int num);
339 int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
340 int longjmp_break_handler(struct kprobe *, struct pt_regs *);
341 int register_jprobe(struct jprobe *p);
342 void unregister_jprobe(struct jprobe *p);
343 int register_jprobes(struct jprobe **jps, int num);
344 void unregister_jprobes(struct jprobe **jps, int num);
345 void jprobe_return(void);
346 unsigned long arch_deref_entry_point(void *);
347 
348 int register_kretprobe(struct kretprobe *rp);
349 void unregister_kretprobe(struct kretprobe *rp);
350 int register_kretprobes(struct kretprobe **rps, int num);
351 void unregister_kretprobes(struct kretprobe **rps, int num);
352 
353 void kprobe_flush_task(struct task_struct *tk);
354 void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
355 
356 int disable_kprobe(struct kprobe *kp);
357 int enable_kprobe(struct kprobe *kp);
358 
359 void dump_kprobe(struct kprobe *kp);
360 
361 #else /* !CONFIG_KPROBES: */
362 
363 static inline int kprobes_built_in(void)
364 {
365         return 0;
366 }
367 static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
368 {
369         return 0;
370 }
371 static inline struct kprobe *get_kprobe(void *addr)
372 {
373         return NULL;
374 }
375 static inline struct kprobe *kprobe_running(void)
376 {
377         return NULL;
378 }
379 static inline int register_kprobe(struct kprobe *p)
380 {
381         return -ENOSYS;
382 }
383 static inline int register_kprobes(struct kprobe **kps, int num)
384 {
385         return -ENOSYS;
386 }
387 static inline void unregister_kprobe(struct kprobe *p)
388 {
389 }
390 static inline void unregister_kprobes(struct kprobe **kps, int num)
391 {
392 }
393 static inline int register_jprobe(struct jprobe *p)
394 {
395         return -ENOSYS;
396 }
397 static inline int register_jprobes(struct jprobe **jps, int num)
398 {
399         return -ENOSYS;
400 }
401 static inline void unregister_jprobe(struct jprobe *p)
402 {
403 }
404 static inline void unregister_jprobes(struct jprobe **jps, int num)
405 {
406 }
407 static inline void jprobe_return(void)
408 {
409 }
410 static inline int register_kretprobe(struct kretprobe *rp)
411 {
412         return -ENOSYS;
413 }
414 static inline int register_kretprobes(struct kretprobe **rps, int num)
415 {
416         return -ENOSYS;
417 }
418 static inline void unregister_kretprobe(struct kretprobe *rp)
419 {
420 }
421 static inline void unregister_kretprobes(struct kretprobe **rps, int num)
422 {
423 }
424 static inline void kprobe_flush_task(struct task_struct *tk)
425 {
426 }
427 static inline int disable_kprobe(struct kprobe *kp)
428 {
429         return -ENOSYS;
430 }
431 static inline int enable_kprobe(struct kprobe *kp)
432 {
433         return -ENOSYS;
434 }
435 #endif /* CONFIG_KPROBES */
436 static inline int disable_kretprobe(struct kretprobe *rp)
437 {
438         return disable_kprobe(&rp->kp);
439 }
440 static inline int enable_kretprobe(struct kretprobe *rp)
441 {
442         return enable_kprobe(&rp->kp);
443 }
444 static inline int disable_jprobe(struct jprobe *jp)
445 {
446         return disable_kprobe(&jp->kp);
447 }
448 static inline int enable_jprobe(struct jprobe *jp)
449 {
450         return enable_kprobe(&jp->kp);
451 }
452 
453 #endif /* _LINUX_KPROBES_H */
454 

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