255 строки
7.8 KiB
C
255 строки
7.8 KiB
C
#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/list.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/mutex.h>
|
|
|
|
#ifdef CONFIG_KPROBES
|
|
#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;
|
|
|
|
/* Indicates that the corresponding module has been ref counted */
|
|
unsigned int mod_refcounted;
|
|
|
|
/*count the number of times this probe was temporarily disarmed */
|
|
unsigned long nmissed;
|
|
|
|
/* location of the probe point */
|
|
kprobe_opcode_t *addr;
|
|
|
|
/* Allow user to indicate symbol name of the probe point */
|
|
const char *symbol_name;
|
|
|
|
/* Offset into the symbol */
|
|
unsigned int offset;
|
|
|
|
/* 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 */
|
|
};
|
|
|
|
DECLARE_PER_CPU(struct kprobe *, current_kprobe);
|
|
DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
|
|
|
|
#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;
|
|
};
|
|
|
|
static inline void kretprobe_assert(struct kretprobe_instance *ri,
|
|
unsigned long orig_ret_address, unsigned long trampoline_address)
|
|
{
|
|
if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
|
|
printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
|
|
ri->rp, ri->rp->kp.addr);
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
extern spinlock_t kretprobe_lock;
|
|
extern struct mutex kprobe_mutex;
|
|
extern int arch_prepare_kprobe(struct kprobe *p);
|
|
extern void arch_arm_kprobe(struct kprobe *p);
|
|
extern void arch_disarm_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, int dirty);
|
|
extern void kprobes_inc_nmissed_count(struct kprobe *p);
|
|
|
|
/* Get the kprobe at this addr (if any) - called with preemption disabled */
|
|
struct kprobe *get_kprobe(void *addr);
|
|
struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
|
|
|
|
/* kprobe_running() will just return the current_kprobe on this CPU */
|
|
static inline struct kprobe *kprobe_running(void)
|
|
{
|
|
return (__get_cpu_var(current_kprobe));
|
|
}
|
|
|
|
static inline void reset_current_kprobe(void)
|
|
{
|
|
__get_cpu_var(current_kprobe) = NULL;
|
|
}
|
|
|
|
static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
|
|
{
|
|
return (&__get_cpu_var(kprobe_ctlblk));
|
|
}
|
|
|
|
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, struct hlist_head *head);
|
|
#else /* CONFIG_KPROBES */
|
|
|
|
#define __kprobes /**/
|
|
struct jprobe;
|
|
struct kretprobe;
|
|
|
|
static inline struct kprobe *kprobe_running(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
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 */
|