kprobes.h
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- #ifndef _LINUX_KPROBES_H
- #define _LINUX_KPROBES_H
- /*
- * Kernel Probes (KProbes)
- * include/linux/kprobes.h
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) IBM Corporation, 2002, 2004
- *
- * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
- * Probes initial implementation ( includes suggestions from
- * Rusty Russell).
- * 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
- * interface to access function arguments.
- * 2005-May Hien Nguyen <hien@us.ibm.com> and Jim Keniston
- * <jkenisto@us.ibm.com> and Prasanna S Panchamukhi
- * <prasanna@in.ibm.com> added function-return probes.
- */
- #include <linux/config.h>
- #include <linux/list.h>
- #include <linux/notifier.h>
- #include <linux/smp.h>
- #include <asm/kprobes.h>
- /* kprobe_status settings */
- #define KPROBE_HIT_ACTIVE 0x00000001
- #define KPROBE_HIT_SS 0x00000002
- #define KPROBE_REENTER 0x00000004
- #define KPROBE_HIT_SSDONE 0x00000008
- /* Attach to insert probes on any functions which should be ignored*/
- #define __kprobes __attribute__((__section__(".kprobes.text")))
- struct kprobe;
- struct pt_regs;
- struct kretprobe;
- struct kretprobe_instance;
- typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
- typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
- typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
- unsigned long flags);
- typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
- int trapnr);
- typedef int (*kretprobe_handler_t) (struct kretprobe_instance *,
- struct pt_regs *);
- struct kprobe {
- struct hlist_node hlist;
- /* list of kprobes for multi-handler support */
- struct list_head list;
- /*count the number of times this probe was temporarily disarmed */
- unsigned long nmissed;
- /* location of the probe point */
- kprobe_opcode_t *addr;
- /* Called before addr is executed. */
- kprobe_pre_handler_t pre_handler;
- /* Called after addr is executed, unless... */
- kprobe_post_handler_t post_handler;
- /* ... called if executing addr causes a fault (eg. page fault).
- * Return 1 if it handled fault, otherwise kernel will see it. */
- kprobe_fault_handler_t fault_handler;
- /* ... called if breakpoint trap occurs in probe handler.
- * Return 1 if it handled break, otherwise kernel will see it. */
- kprobe_break_handler_t break_handler;
- /* Saved opcode (which has been replaced with breakpoint) */
- kprobe_opcode_t opcode;
- /* copy of the original instruction */
- struct arch_specific_insn ainsn;
- };
- /*
- * Special probe type that uses setjmp-longjmp type tricks to resume
- * execution at a specified entry with a matching prototype corresponding
- * to the probed function - a trick to enable arguments to become
- * accessible seamlessly by probe handling logic.
- * Note:
- * Because of the way compilers allocate stack space for local variables
- * etc upfront, regardless of sub-scopes within a function, this mirroring
- * principle currently works only for probes placed on function entry points.
- */
- struct jprobe {
- struct kprobe kp;
- kprobe_opcode_t *entry; /* probe handling code to jump to */
- };
- #ifdef ARCH_SUPPORTS_KRETPROBES
- extern void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs);
- #else /* ARCH_SUPPORTS_KRETPROBES */
- static inline void arch_prepare_kretprobe(struct kretprobe *rp,
- struct pt_regs *regs)
- {
- }
- #endif /* ARCH_SUPPORTS_KRETPROBES */
- /*
- * Function-return probe -
- * Note:
- * User needs to provide a handler function, and initialize maxactive.
- * maxactive - The maximum number of instances of the probed function that
- * can be active concurrently.
- * nmissed - tracks the number of times the probed function's return was
- * ignored, due to maxactive being too low.
- *
- */
- struct kretprobe {
- struct kprobe kp;
- kretprobe_handler_t handler;
- int maxactive;
- int nmissed;
- struct hlist_head free_instances;
- struct hlist_head used_instances;
- };
- struct kretprobe_instance {
- struct hlist_node uflist; /* either on free list or used list */
- struct hlist_node hlist;
- struct kretprobe *rp;
- kprobe_opcode_t *ret_addr;
- struct task_struct *task;
- };
- #ifdef CONFIG_KPROBES
- /* Locks kprobe: irq must be disabled */
- void lock_kprobes(void);
- void unlock_kprobes(void);
- /* kprobe running now on this CPU? */
- static inline int kprobe_running(void)
- {
- extern unsigned int kprobe_cpu;
- return kprobe_cpu == smp_processor_id();
- }
- extern int arch_prepare_kprobe(struct kprobe *p);
- extern void arch_copy_kprobe(struct kprobe *p);
- extern void arch_arm_kprobe(struct kprobe *p);
- extern void arch_disarm_kprobe(struct kprobe *p);
- extern void arch_remove_kprobe(struct kprobe *p);
- extern int arch_init_kprobes(void);
- extern void show_registers(struct pt_regs *regs);
- extern kprobe_opcode_t *get_insn_slot(void);
- extern void free_insn_slot(kprobe_opcode_t *slot);
- /* Get the kprobe at this addr (if any). Must have called lock_kprobes */
- struct kprobe *get_kprobe(void *addr);
- struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
- int register_kprobe(struct kprobe *p);
- void unregister_kprobe(struct kprobe *p);
- int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
- int longjmp_break_handler(struct kprobe *, struct pt_regs *);
- int register_jprobe(struct jprobe *p);
- void unregister_jprobe(struct jprobe *p);
- void jprobe_return(void);
- int register_kretprobe(struct kretprobe *rp);
- void unregister_kretprobe(struct kretprobe *rp);
- struct kretprobe_instance *get_free_rp_inst(struct kretprobe *rp);
- void add_rp_inst(struct kretprobe_instance *ri);
- void kprobe_flush_task(struct task_struct *tk);
- void recycle_rp_inst(struct kretprobe_instance *ri);
- #else /* CONFIG_KPROBES */
- static inline int kprobe_running(void)
- {
- return 0;
- }
- static inline int register_kprobe(struct kprobe *p)
- {
- return -ENOSYS;
- }
- static inline void unregister_kprobe(struct kprobe *p)
- {
- }
- static inline int register_jprobe(struct jprobe *p)
- {
- return -ENOSYS;
- }
- static inline void unregister_jprobe(struct jprobe *p)
- {
- }
- static inline void jprobe_return(void)
- {
- }
- static inline int register_kretprobe(struct kretprobe *rp)
- {
- return -ENOSYS;
- }
- static inline void unregister_kretprobe(struct kretprobe *rp)
- {
- }
- static inline void kprobe_flush_task(struct task_struct *tk)
- {
- }
- #endif /* CONFIG_KPROBES */
- #endif /* _LINUX_KPROBES_H */