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Diffstat (limited to 'include/linux/kprobes.h')
| -rw-r--r-- | include/linux/kprobes.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h new file mode 100644 index 000000000000..f20c163de4f5 --- /dev/null +++ b/include/linux/kprobes.h @@ -0,0 +1,136 @@ +#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. + */ +#include <linux/config.h> +#include <linux/list.h> +#include <linux/notifier.h> +#include <linux/smp.h> +#include <asm/kprobes.h> + +struct kprobe; +struct pt_regs; +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); +struct kprobe { + struct hlist_node hlist; + + /* 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 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_remove_kprobe(struct kprobe *p); +extern void show_registers(struct pt_regs *regs); + +/* Get the kprobe at this addr (if any). Must have called lock_kprobes */ +struct kprobe *get_kprobe(void *addr); + +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); + +#else +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) +{ +} +#endif +#endif /* _LINUX_KPROBES_H */ |