--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/linux/kprobes.h Sun Jan 11 20:20:11 2009 +0100
@@ -0,0 +1,321 @@
+#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/linkage.h>
+#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"))) notrace
+
+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;
+ void *entry; /* probe handling code to jump to */
+};
+
+/* For backward compatibility with old code using JPROBE_ENTRY() */
+#define JPROBE_ENTRY(handler) (handler)
+
+DECLARE_PER_CPU(struct kprobe *, current_kprobe);
+DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
+#ifdef CONFIG_KRETPROBES
+extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
+ struct pt_regs *regs);
+extern int arch_trampoline_kprobe(struct kprobe *p);
+#else /* CONFIG_KRETPROBES */
+static inline void arch_prepare_kretprobe(struct kretprobe *rp,
+ struct pt_regs *regs)
+{
+}
+static inline int arch_trampoline_kprobe(struct kprobe *p)
+{
+ return 0;
+}
+#endif /* CONFIG_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;
+ kretprobe_handler_t entry_handler;
+ int maxactive;
+ int nmissed;
+ size_t data_size;
+ struct hlist_head free_instances;
+ spinlock_t lock;
+};
+
+struct kretprobe_instance {
+ struct hlist_node hlist;
+ struct kretprobe *rp;
+ kprobe_opcode_t *ret_addr;
+ struct task_struct *task;
+ char data[0];
+};
+
+struct kretprobe_blackpoint {
+ const char *name;
+ void *addr;
+};
+
+struct kprobe_blackpoint {
+ const char *name;
+ unsigned long start_addr;
+ unsigned long range;
+};
+
+extern struct kretprobe_blackpoint kretprobe_blacklist[];
+
+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();
+ }
+}
+
+#ifdef CONFIG_KPROBES_SANITY_TEST
+extern int init_test_probes(void);
+#else
+static inline int init_test_probes(void)
+{
+ return 0;
+}
+#endif /* CONFIG_KPROBES_SANITY_TEST */
+
+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);
+void kretprobe_hash_lock(struct task_struct *tsk,
+ struct hlist_head **head, unsigned long *flags);
+void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
+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 register_kprobes(struct kprobe **kps, int num);
+void unregister_kprobes(struct kprobe **kps, int num);
+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);
+int register_jprobes(struct jprobe **jps, int num);
+void unregister_jprobes(struct jprobe **jps, int num);
+void jprobe_return(void);
+unsigned long arch_deref_entry_point(void *);
+
+int register_kretprobe(struct kretprobe *rp);
+void unregister_kretprobe(struct kretprobe *rp);
+int register_kretprobes(struct kretprobe **rps, int num);
+void unregister_kretprobes(struct kretprobe **rps, int num);
+
+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 notrace
+struct jprobe;
+struct kretprobe;
+
+static inline struct kprobe *get_kprobe(void *addr)
+{
+ return NULL;
+}
+static inline struct kprobe *kprobe_running(void)
+{
+ return NULL;
+}
+static inline int register_kprobe(struct kprobe *p)
+{
+ return -ENOSYS;
+}
+static inline int register_kprobes(struct kprobe **kps, int num)
+{
+ return -ENOSYS;
+}
+static inline void unregister_kprobe(struct kprobe *p)
+{
+}
+static inline void unregister_kprobes(struct kprobe **kps, int num)
+{
+}
+static inline int register_jprobe(struct jprobe *p)
+{
+ return -ENOSYS;
+}
+static inline int register_jprobes(struct jprobe **jps, int num)
+{
+ return -ENOSYS;
+}
+static inline void unregister_jprobe(struct jprobe *p)
+{
+}
+static inline void unregister_jprobes(struct jprobe **jps, int num)
+{
+}
+static inline void jprobe_return(void)
+{
+}
+static inline int register_kretprobe(struct kretprobe *rp)
+{
+ return -ENOSYS;
+}
+static inline int register_kretprobes(struct kretprobe **rps, int num)
+{
+ return -ENOSYS;
+}
+static inline void unregister_kretprobe(struct kretprobe *rp)
+{
+}
+static inline void unregister_kretprobes(struct kretprobe **rps, int num)
+{
+}
+static inline void kprobe_flush_task(struct task_struct *tk)
+{
+}
+#endif /* CONFIG_KPROBES */
+#endif /* _LINUX_KPROBES_H */