64f562c6df
Allow registration of multiple kprobes at an address in an architecture agnostic way. Corresponding handlers will be invoked in a sequence. But, a kprobe and a jprobe can't (yet) co-exist at the same address. Signed-off-by: Ananth N Mavinakayanahalli <amavin@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
#ifndef _LINUX_KPROBES_H
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#define _LINUX_KPROBES_H
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/*
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* Kernel Probes (KProbes)
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* include/linux/kprobes.h
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2002, 2004
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*
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* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
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* Probes initial implementation ( includes suggestions from
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* Rusty Russell).
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* 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
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* interface to access function arguments.
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*/
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#include <linux/config.h>
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#include <linux/list.h>
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#include <linux/notifier.h>
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#include <linux/smp.h>
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#include <asm/kprobes.h>
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struct kprobe;
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struct pt_regs;
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typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
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typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
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typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
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unsigned long flags);
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typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
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int trapnr);
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struct kprobe {
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struct hlist_node hlist;
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/* list of kprobes for multi-handler support */
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struct list_head list;
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/* location of the probe point */
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kprobe_opcode_t *addr;
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/* Called before addr is executed. */
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kprobe_pre_handler_t pre_handler;
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/* Called after addr is executed, unless... */
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kprobe_post_handler_t post_handler;
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/* ... called if executing addr causes a fault (eg. page fault).
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* Return 1 if it handled fault, otherwise kernel will see it. */
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kprobe_fault_handler_t fault_handler;
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/* ... called if breakpoint trap occurs in probe handler.
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* Return 1 if it handled break, otherwise kernel will see it. */
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kprobe_break_handler_t break_handler;
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/* Saved opcode (which has been replaced with breakpoint) */
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kprobe_opcode_t opcode;
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/* copy of the original instruction */
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struct arch_specific_insn ainsn;
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};
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/*
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* Special probe type that uses setjmp-longjmp type tricks to resume
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* execution at a specified entry with a matching prototype corresponding
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* to the probed function - a trick to enable arguments to become
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* accessible seamlessly by probe handling logic.
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* Note:
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* Because of the way compilers allocate stack space for local variables
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* etc upfront, regardless of sub-scopes within a function, this mirroring
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* principle currently works only for probes placed on function entry points.
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*/
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struct jprobe {
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struct kprobe kp;
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kprobe_opcode_t *entry; /* probe handling code to jump to */
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};
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#ifdef CONFIG_KPROBES
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/* Locks kprobe: irq must be disabled */
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void lock_kprobes(void);
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void unlock_kprobes(void);
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/* kprobe running now on this CPU? */
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static inline int kprobe_running(void)
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{
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extern unsigned int kprobe_cpu;
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return kprobe_cpu == smp_processor_id();
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}
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extern int arch_prepare_kprobe(struct kprobe *p);
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extern void arch_copy_kprobe(struct kprobe *p);
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extern void arch_remove_kprobe(struct kprobe *p);
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extern void show_registers(struct pt_regs *regs);
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/* Get the kprobe at this addr (if any). Must have called lock_kprobes */
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struct kprobe *get_kprobe(void *addr);
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int register_kprobe(struct kprobe *p);
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void unregister_kprobe(struct kprobe *p);
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int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
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int longjmp_break_handler(struct kprobe *, struct pt_regs *);
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int register_jprobe(struct jprobe *p);
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void unregister_jprobe(struct jprobe *p);
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void jprobe_return(void);
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#else
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static inline int kprobe_running(void)
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{
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return 0;
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}
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static inline int register_kprobe(struct kprobe *p)
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{
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return -ENOSYS;
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}
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static inline void unregister_kprobe(struct kprobe *p)
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{
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}
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static inline int register_jprobe(struct jprobe *p)
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{
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return -ENOSYS;
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}
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static inline void unregister_jprobe(struct jprobe *p)
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{
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}
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static inline void jprobe_return(void)
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{
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}
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#endif
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#endif /* _LINUX_KPROBES_H */
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