4 * Kernel Probes (KProbes)
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.
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.
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.
21 * Copyright (C) IBM Corporation, 2002, 2004
25 * Dynamic Binary Instrumentation Module based on KProbes
26 * modules/kprobe/dbi_kprobes.h
28 * This program is free software; you can redistribute it and/or modify
29 * it under the terms of the GNU General Public License as published by
30 * the Free Software Foundation; either version 2 of the License, or
31 * (at your option) any later version.
33 * This program is distributed in the hope that it will be useful,
34 * but WITHOUT ANY WARRANTY; without even the implied warranty of
35 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
36 * GNU General Public License for more details.
38 * You should have received a copy of the GNU General Public License
39 * along with this program; if not, write to the Free Software
40 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
42 * Copyright (C) Samsung Electronics, 2006-2010
44 * 2006-2007 Ekaterina Gorelkina <e.gorelkina@samsung.com>: initial implementation for ARM and MIPS
45 * 2008-2009 Alexey Gerenkov <a.gerenkov@samsung.com> User-Space
46 * Probes initial implementation; Support x86/ARM/MIPS for both user and kernel spaces.
47 * 2010 Ekaterina Gorelkina <e.gorelkina@samsung.com>: redesign module for separating core and arch parts
51 #include "dbi_kprobes.h"
52 #include "arch/dbi_kprobes.h"
53 #include "arch/asm/dbi_kprobes.h"
55 #include "dbi_kdebug.h"
56 #include "dbi_kprobes_deps.h"
57 #include "dbi_insn_slots.h"
58 #include "dbi_uprobes.h"
61 #include <linux/version.h>
62 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
63 #include <linux/config.h>
66 #include <linux/hash.h>
67 #include <linux/module.h>
69 #include <linux/pagemap.h>
73 extern unsigned long sched_addr;
74 extern unsigned long fork_addr;
75 extern struct hlist_head kprobe_insn_pages;
77 DEFINE_PER_CPU (struct kprobe *, current_kprobe) = NULL;
78 DEFINE_PER_CPU (struct kprobe_ctlblk, kprobe_ctlblk);
80 DEFINE_SPINLOCK (kretprobe_lock); /* Protects kretprobe_inst_table */
81 DEFINE_PER_CPU (struct kprobe *, kprobe_instance) = NULL;
83 struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
84 struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
86 atomic_t kprobe_count;
89 void kretprobe_assert (struct kretprobe_instance *ri, unsigned long orig_ret_address, unsigned long trampoline_address)
91 if (!orig_ret_address || (orig_ret_address == trampoline_address))
92 panic ("kretprobe BUG!: Processing kretprobe %p @ %p (%d/%d - %s)\n",
93 ri->rp, ri->rp->kp.addr, ri->task->tgid, ri->task->pid, ri->task->comm);
97 /* We have preemption disabled.. so it is safe to use __ versions */
99 void set_kprobe_instance (struct kprobe *kp)
101 __get_cpu_var (kprobe_instance) = kp;
105 void reset_kprobe_instance (void)
107 __get_cpu_var (kprobe_instance) = NULL;
110 /* kprobe_running() will just return the current_kprobe on this CPU */
111 struct kprobe *kprobe_running (void)
113 return (__get_cpu_var (current_kprobe));
116 void reset_current_kprobe (void)
118 __get_cpu_var (current_kprobe) = NULL;
121 struct kprobe_ctlblk *get_kprobe_ctlblk (void)
123 return (&__get_cpu_var (kprobe_ctlblk));
127 * This routine is called either:
128 * - under the kprobe_mutex - during kprobe_[un]register()
130 * - with preemption disabled - from arch/xxx/kernel/kprobes.c
132 struct kprobe *get_kprobe(kprobe_opcode_t *addr, pid_t tgid)
134 struct hlist_head *head;
135 struct hlist_node *node;
136 struct kprobe *p, *retVal = NULL;
138 head = &kprobe_table[hash_ptr (addr, KPROBE_HASH_BITS)];
139 hlist_for_each_entry_rcu(p, node, head, hlist) {
140 if (p->addr == addr && p->tgid == tgid) {
146 DBPRINTF ("get_kprobe: probe %p", retVal);
151 * Aggregate handlers for multiple kprobes support - these handlers
152 * take care of invoking the individual kprobe handlers on p->list
155 int aggr_pre_handler (struct kprobe *p, struct pt_regs *regs)
160 list_for_each_entry_rcu (kp, &p->list, list)
164 set_kprobe_instance (kp);
165 ret = kp->pre_handler (kp, regs);
169 reset_kprobe_instance ();
175 void aggr_post_handler (struct kprobe *p, struct pt_regs *regs, unsigned long flags)
179 list_for_each_entry_rcu (kp, &p->list, list)
181 if (kp->post_handler)
183 set_kprobe_instance (kp);
184 kp->post_handler (kp, regs, flags);
185 reset_kprobe_instance ();
191 int aggr_fault_handler (struct kprobe *p, struct pt_regs *regs, int trapnr)
193 struct kprobe *cur = __get_cpu_var (kprobe_instance);
196 * if we faulted "during" the execution of a user specified
197 * probe handler, invoke just that probe's fault handler
199 if (cur && cur->fault_handler)
201 if (cur->fault_handler (cur, regs, trapnr))
208 int aggr_break_handler (struct kprobe *p, struct pt_regs *regs)
210 struct kprobe *cur = __get_cpu_var (kprobe_instance);
212 DBPRINTF ("cur = 0x%p\n", cur);
214 DBPRINTF ("cur = 0x%p cur->break_handler = 0x%p\n", cur, cur->break_handler);
216 if (cur && cur->break_handler)
218 if (cur->break_handler (cur, regs /*, vma, page, kaddr */ ))
221 reset_kprobe_instance ();
225 /* Walks the list and increments nmissed count for multiprobe case */
226 void kprobes_inc_nmissed_count (struct kprobe *p)
229 if (p->pre_handler != aggr_pre_handler)
235 list_for_each_entry_rcu (kp, &p->list, list) kp->nmissed++;
240 /* Called with kretprobe_lock held */
241 struct kretprobe_instance *get_free_rp_inst (struct kretprobe *rp)
243 struct hlist_node *node;
244 struct kretprobe_instance *ri;
245 hlist_for_each_entry (ri, node, &rp->free_instances, uflist)
247 if(!alloc_nodes_kretprobe(rp)){
248 hlist_for_each_entry (ri, node, &rp->free_instances, uflist)
254 /* Called with kretprobe_lock held */
255 struct kretprobe_instance *get_free_rp_inst_no_alloc (struct kretprobe *rp)
257 struct hlist_node *node;
258 struct kretprobe_instance *ri;
259 hlist_for_each_entry (ri, node, &rp->free_instances, uflist)
264 /* Called with kretprobe_lock held */
265 struct kretprobe_instance *get_used_rp_inst (struct kretprobe *rp)
267 struct hlist_node *node;
268 struct kretprobe_instance *ri;
269 hlist_for_each_entry (ri, node, &rp->used_instances, uflist) return ri;
273 /* Called with kretprobe_lock held */
274 void add_rp_inst (struct kretprobe_instance *ri)
277 * Remove rp inst off the free list -
278 * Add it back when probed function returns
280 hlist_del (&ri->uflist);
282 /* Add rp inst onto table */
283 INIT_HLIST_NODE (&ri->hlist);
285 * We are using different hash keys (task and mm) for finding kernel
286 * space and user space probes. Kernel space probes can change mm field in
287 * task_struct. User space probes can be shared between threads of one
288 * process so they have different task but same mm.
290 if (ri->rp->kp.tgid) {
291 hlist_add_head (&ri->hlist, &kretprobe_inst_table[hash_ptr (ri->task->mm, KPROBE_HASH_BITS)]);
293 hlist_add_head (&ri->hlist, &kretprobe_inst_table[hash_ptr (ri->task, KPROBE_HASH_BITS)]);
296 /* Also add this rp inst to the used list. */
297 INIT_HLIST_NODE (&ri->uflist);
298 hlist_add_head (&ri->uflist, &ri->rp->used_instances);
301 /* Called with kretprobe_lock held */
302 void recycle_rp_inst (struct kretprobe_instance *ri)
306 hlist_del (&ri->hlist);
307 /* remove rp inst off the used list */
308 hlist_del (&ri->uflist);
309 /* put rp inst back onto the free list */
310 INIT_HLIST_NODE (&ri->uflist);
311 hlist_add_head (&ri->uflist, &ri->rp->free_instances);
312 } else if (!ri->rp2) {
314 * This is __switch_to retprobe instance. It has neither rp nor rp2.
316 hlist_del (&ri->hlist);
320 struct hlist_head * kretprobe_inst_table_head (void *hash_key)
322 return &kretprobe_inst_table[hash_ptr (hash_key, KPROBE_HASH_BITS)];
325 void free_rp_inst (struct kretprobe *rp)
327 struct kretprobe_instance *ri;
328 while ((ri = get_free_rp_inst_no_alloc (rp)) != NULL)
330 hlist_del (&ri->uflist);
336 * Keep all fields in the kprobe consistent
339 void copy_kprobe (struct kprobe *old_p, struct kprobe *p)
341 memcpy (&p->opcode, &old_p->opcode, sizeof (kprobe_opcode_t));
342 memcpy (&p->ainsn, &old_p->ainsn, sizeof (struct arch_specific_insn));
343 p->tgid = old_p->tgid;
344 p->ss_addr = old_p->ss_addr;
346 p->safe_arm = old_p->safe_arm;
347 p->safe_thumb = old_p->safe_thumb;
349 //p->spid = old_p->spid;
353 * Add the new probe to old_p->list. Fail if this is the
354 * second jprobe at the address - two jprobes can't coexist
356 int add_new_kprobe (struct kprobe *old_p, struct kprobe *p)
358 if (p->break_handler)
360 if (old_p->break_handler)
362 list_add_tail_rcu (&p->list, &old_p->list);
363 old_p->break_handler = aggr_break_handler;
366 list_add_rcu (&p->list, &old_p->list);
367 if (p->post_handler && !old_p->post_handler)
368 old_p->post_handler = aggr_post_handler;
373 * hlist_replace_rcu - replace old entry by new one
374 * @old : the element to be replaced
375 * @new : the new element to insert
377 * The @old entry will be replaced with the @new entry atomically.
379 inline void dbi_hlist_replace_rcu (struct hlist_node *old, struct hlist_node *new)
381 struct hlist_node *next = old->next;
384 new->pprev = old->pprev;
387 new->next->pprev = &new->next;
390 old->pprev = LIST_POISON2;
395 * Fill in the required fields of the "manager kprobe". Replace the
396 * earlier kprobe in the hlist with the manager kprobe
399 void add_aggr_kprobe (struct kprobe *ap, struct kprobe *p)
402 //flush_insn_slot (ap);
404 ap->pre_handler = aggr_pre_handler;
405 ap->fault_handler = aggr_fault_handler;
407 ap->post_handler = aggr_post_handler;
408 if (p->break_handler)
409 ap->break_handler = aggr_break_handler;
411 INIT_LIST_HEAD (&ap->list);
412 list_add_rcu (&p->list, &ap->list);
414 dbi_hlist_replace_rcu (&p->hlist, &ap->hlist);
418 * This is the second or subsequent kprobe at the address - handle
421 int register_aggr_kprobe (struct kprobe *old_p, struct kprobe *p)
425 DBPRINTF ("start\n");
427 DBPRINTF ("p = %p old_p = %p \n", p, old_p);
428 if (old_p->pre_handler == aggr_pre_handler)
430 DBPRINTF ("aggr_pre_handler \n");
432 copy_kprobe (old_p, p);
433 ret = add_new_kprobe (old_p, p);
437 DBPRINTF ("kzalloc\n");
440 ap = kzalloc (sizeof (struct kprobe), GFP_KERNEL);
442 ap = kmalloc (sizeof (struct kprobe), GFP_KERNEL);
444 memset (ap, 0, sizeof (struct kprobe));
448 add_aggr_kprobe (ap, old_p);
450 DBPRINTF ("ap = %p p = %p old_p = %p \n", ap, p, old_p);
451 ret = add_new_kprobe (ap, p);
456 int dbi_register_kprobe (struct kprobe *p)
458 struct kprobe *old_p;
461 * If we have a symbol_name argument look it up,
462 * and add it to the address. That way the addr
463 * field can either be global or relative to a symbol.
469 p->addr = (kprobe_opcode_t *)swap_ksyms(p->symbol_name);
474 DBPRINTF ("p->addr = 0x%p\n", p->addr);
475 p->addr = (kprobe_opcode_t *) (((char *) p->addr) + p->offset);
476 DBPRINTF ("p->addr = 0x%p p = 0x%p\n", p->addr, p);
478 #ifdef KPROBES_PROFILE
479 p->start_tm.tv_sec = p->start_tm.tv_usec = 0;
480 p->hnd_tm_sum.tv_sec = p->hnd_tm_sum.tv_usec = 0;
483 p->mod_refcounted = 0;
486 old_p = get_kprobe(p->addr, 0);
489 ret = register_aggr_kprobe (old_p, p);
491 atomic_inc (&kprobe_count);
495 if ((ret = arch_prepare_kprobe (p)) != 0)
498 DBPRINTF ("before out ret = 0x%x\n", ret);
499 INIT_HLIST_NODE (&p->hlist);
500 hlist_add_head_rcu (&p->hlist, &kprobe_table[hash_ptr (p->addr, KPROBE_HASH_BITS)]);
504 DBPRINTF ("out ret = 0x%x\n", ret);
508 void dbi_unregister_kprobe (struct kprobe *p, struct task_struct *task)
510 struct kprobe *old_p, *list_p;
511 int cleanup_p, pid = p->tgid;
513 old_p = get_kprobe(p->addr, pid);
514 DBPRINTF ("dbi_unregister_kprobe p=%p old_p=%p", p, old_p);
515 if (unlikely (!old_p))
520 list_for_each_entry_rcu (list_p, &old_p->list, list)
522 /* kprobe p is a valid probe */
528 DBPRINTF ("dbi_unregister_kprobe valid_p");
529 if ((old_p == p) || ((old_p->pre_handler == aggr_pre_handler) &&
530 (p->list.next == &old_p->list) && (p->list.prev == &old_p->list)))
532 /* Only probe on the hash list */
533 DBPRINTF ("dbi_unregister_kprobe disarm pid=%d", pid);
535 arch_disarm_uprobe (p, task);//vma, page, kaddr);
537 arch_disarm_kprobe (p);
538 hlist_del_rcu (&old_p->hlist);
543 list_del_rcu (&p->list);
546 DBPRINTF ("dbi_unregister_kprobe cleanup_p=%d", cleanup_p);
552 list_del_rcu (&p->list);
555 arch_remove_kprobe (p, task);
559 if (p->break_handler)
560 old_p->break_handler = NULL;
563 list_for_each_entry_rcu (list_p, &old_p->list, list)
565 if (list_p->post_handler)
572 old_p->post_handler = NULL;
577 int dbi_register_jprobe (struct jprobe *jp)
579 /* Todo: Verify probepoint is a function entry point */
580 jp->kp.pre_handler = setjmp_pre_handler;
581 jp->kp.break_handler = longjmp_break_handler;
583 return dbi_register_kprobe (&jp->kp);
586 void dbi_unregister_jprobe (struct jprobe *jp)
588 dbi_unregister_kprobe (&jp->kp, 0);
592 * This kprobe pre_handler is registered with every kretprobe. When probe
593 * hits it will set up the return probe.
595 int pre_handler_kretprobe (struct kprobe *p, struct pt_regs *regs)
597 struct kretprobe *rp = container_of (p, struct kretprobe, kp);
598 unsigned long flags = 0;
599 DBPRINTF ("START\n");
601 /*TODO: consider to only swap the RA after the last pre_handler fired */
602 spin_lock_irqsave (&kretprobe_lock, flags);
604 __arch_prepare_kretprobe (rp, regs);
605 spin_unlock_irqrestore (&kretprobe_lock, flags);
610 struct kretprobe *sched_rp;
612 #define SCHED_RP_NR 200
613 #define COMMON_RP_NR 10
615 int alloc_nodes_kretprobe(struct kretprobe *rp)
618 struct kretprobe_instance *inst;
621 DBPRINTF("Alloc aditional mem for retprobes");
623 if ((unsigned long)rp->kp.addr == sched_addr){
624 rp->maxactive += SCHED_RP_NR;//max (100, 2 * NR_CPUS);
625 alloc_nodes = SCHED_RP_NR;
629 #if 1//def CONFIG_PREEMPT
630 rp->maxactive += max (COMMON_RP_NR, 2 * NR_CPUS);
632 rp->maxacpptive += NR_CPUS;
634 alloc_nodes = COMMON_RP_NR;
636 /* INIT_HLIST_HEAD (&rp->used_instances); */
637 /* INIT_HLIST_HEAD (&rp->free_instances); */
638 for (i = 0; i < alloc_nodes; i++)
640 inst = kmalloc (sizeof (struct kretprobe_instance), GFP_ATOMIC);
646 INIT_HLIST_NODE (&inst->uflist);
647 hlist_add_head (&inst->uflist, &rp->free_instances);
650 DBPRINTF ("addr=%p, *addr=[%lx %lx %lx]", rp->kp.addr, (unsigned long) (*(rp->kp.addr)), (unsigned long) (*(rp->kp.addr + 1)), (unsigned long) (*(rp->kp.addr + 2)));
654 int dbi_register_kretprobe (struct kretprobe *rp)
657 struct kretprobe_instance *inst;
661 rp->kp.pre_handler = pre_handler_kretprobe;
662 rp->kp.post_handler = NULL;
663 rp->kp.fault_handler = NULL;
664 rp->kp.break_handler = NULL;
668 /* Pre-allocate memory for max kretprobe instances */
669 if ((unsigned long)rp->kp.addr == sched_addr) {
670 rp->maxactive = SCHED_RP_NR;//max (100, 2 * NR_CPUS);
671 } else if (rp->maxactive <= 0) {
672 #if 1//def CONFIG_PREEMPT
673 rp->maxactive = max (COMMON_RP_NR, 2 * NR_CPUS);
675 rp->maxactive = NR_CPUS;
678 INIT_HLIST_HEAD (&rp->used_instances);
679 INIT_HLIST_HEAD (&rp->free_instances);
680 for (i = 0; i < rp->maxactive; i++)
682 inst = kmalloc (sizeof (struct kretprobe_instance), GFP_KERNEL);
688 INIT_HLIST_NODE (&inst->uflist);
689 hlist_add_head (&inst->uflist, &rp->free_instances);
692 DBPRINTF ("addr=%p, *addr=[%lx %lx %lx]", rp->kp.addr, (unsigned long) (*(rp->kp.addr)), (unsigned long) (*(rp->kp.addr + 1)), (unsigned long) (*(rp->kp.addr + 2)));
694 /* Establish function entry probe point */
695 if ((ret = dbi_register_kprobe (&rp->kp)) != 0)
698 DBPRINTF ("addr=%p, *addr=[%lx %lx %lx]", rp->kp.addr, (unsigned long) (*(rp->kp.addr)), (unsigned long) (*(rp->kp.addr + 1)), (unsigned long) (*(rp->kp.addr + 2)));
699 if ((unsigned long)rp->kp.addr == sched_addr) {
706 static void unpatch_suspended_all_task_ret_addr(struct kretprobe *rp);
708 void dbi_unregister_kretprobe (struct kretprobe *rp)
711 struct kretprobe_instance *ri;
713 dbi_unregister_kprobe (&rp->kp, 0);
715 if ((unsigned long)rp->kp.addr == sched_addr) {
716 unpatch_suspended_all_task_ret_addr(rp);
721 spin_lock_irqsave (&kretprobe_lock, flags);
722 while ((ri = get_used_rp_inst (rp)) != NULL)
725 hlist_del (&ri->uflist);
727 spin_unlock_irqrestore (&kretprobe_lock, flags);
731 struct kretprobe * clone_kretprobe (struct kretprobe *rp)
733 struct kprobe *old_p;
734 struct kretprobe *clone = NULL;
737 clone = kmalloc (sizeof (struct kretprobe), GFP_KERNEL);
740 DBPRINTF ("failed to alloc memory for clone probe %p!", rp->kp.addr);
743 memcpy (clone, rp, sizeof (struct kretprobe));
744 clone->kp.pre_handler = pre_handler_kretprobe;
745 clone->kp.post_handler = NULL;
746 clone->kp.fault_handler = NULL;
747 clone->kp.break_handler = NULL;
748 old_p = get_kprobe(rp->kp.addr, rp->kp.tgid);
751 ret = register_aggr_kprobe (old_p, &clone->kp);
757 atomic_inc (&kprobe_count);
764 static void inline set_task_trampoline(struct task_struct *p, struct kretprobe_instance *ri, unsigned long tramp_addr)
766 ri->ret_addr = (kprobe_opcode_t *)arch_get_task_pc(p);
767 arch_set_task_pc(p, tramp_addr);
770 static void inline rm_task_trampoline(struct task_struct *p, struct kretprobe_instance *ri)
772 arch_set_task_pc(p, (unsigned long)ri->ret_addr);
775 static struct kretprobe_instance* find_ri_pc_mod(struct task_struct *p, struct kretprobe *rp)
777 struct kretprobe_instance *ri;
778 struct hlist_node *node, *tmp;
779 struct hlist_head *head;
782 spin_lock_irqsave (&kretprobe_lock, flags);
783 head = kretprobe_inst_table_head (p);
784 hlist_for_each_entry_safe (ri, node, tmp, head, hlist) {
785 if ((ri->rp == rp) && (p == ri->task)) {
786 spin_unlock_irqrestore (&kretprobe_lock, flags);
790 spin_unlock_irqrestore (&kretprobe_lock, flags);
795 static void add_ri_pc_mod(struct task_struct *p, struct kretprobe *rp, unsigned long tramp_addr)
797 struct kretprobe_instance *ri;
800 spin_lock_irqsave(&kretprobe_lock, flags);
801 if ((ri = get_free_rp_inst(rp)) != NULL) {
806 set_task_trampoline(p, ri, tramp_addr);
809 printk("no ri for %d\n", p->pid);
812 spin_unlock_irqrestore(&kretprobe_lock, flags);
815 static void patch_suspended_task_ret_addr(struct task_struct *p, struct kretprobe *rp)
817 struct kretprobe_instance *ri = find_ri_pc_mod(p, rp);
821 if( arch_get_task_pc(p) != (unsigned long) &kretprobe_trampoline)
822 set_task_trampoline(p, ri, (unsigned long) &kretprobe_trampoline);
824 add_ri_pc_mod(p, rp, (unsigned long) &kretprobe_trampoline);
828 static void unpatch_suspended_task_ret_addr(struct task_struct *p, struct kretprobe *rp)
830 struct kretprobe_instance *ri;
832 if( arch_get_task_pc(p) == (unsigned long)&kretprobe_trampoline )
834 ri = find_ri_pc_mod(p, rp);
836 rm_task_trampoline(p, ri);
842 void patch_suspended_all_task_ret_addr(struct kretprobe *rp)
844 struct task_struct *p, *g;
848 if(current != &init_task)
849 patch_suspended_task_ret_addr(&init_task, rp);
852 do_each_thread(g, p) {
855 patch_suspended_task_ret_addr(p, rp);
856 } while_each_thread(g, p);
859 /* workaround for do_exit probe on x86 targets */
860 if ((current->flags & PF_EXITING) || (current->flags & PF_EXITPIDONE)) {
861 patch_suspended_task_ret_addr(current, rp);
867 static void unpatch_suspended_all_task_ret_addr(struct kretprobe *rp)
869 struct task_struct *p, *g;
873 unpatch_suspended_task_ret_addr(&init_task, rp);
876 do_each_thread(g, p) {
877 unpatch_suspended_task_ret_addr(p, rp);
878 } while_each_thread(g, p);
882 int __init init_kprobes (void)
886 /* FIXME allocate the probe table, currently defined statically */
887 /* initialize all list heads */
888 for (i = 0; i < KPROBE_TABLE_SIZE; i++)
890 INIT_HLIST_HEAD (&kprobe_table[i]);
891 INIT_HLIST_HEAD (&kretprobe_inst_table[i]);
893 init_uprobes_insn_slots(i);
895 atomic_set (&kprobe_count, 0);
897 err = arch_init_kprobes ();
899 DBPRINTF ("init_kprobes: arch_init_kprobes - %d", err);
904 void __exit exit_kprobes (void)
906 dbi_arch_exit_kprobes ();
909 module_init (init_kprobes);
910 module_exit (exit_kprobes);
912 EXPORT_SYMBOL_GPL (dbi_register_kprobe);
913 EXPORT_SYMBOL_GPL (dbi_unregister_kprobe);
914 EXPORT_SYMBOL_GPL (dbi_register_jprobe);
915 EXPORT_SYMBOL_GPL (dbi_unregister_jprobe);
916 EXPORT_SYMBOL_GPL (dbi_jprobe_return);
917 EXPORT_SYMBOL_GPL (dbi_register_kretprobe);
918 EXPORT_SYMBOL_GPL (dbi_unregister_kretprobe);
920 MODULE_LICENSE ("Dual BSD/GPL");