summaryrefslogtreecommitdiffstats
path: root/include/linux/kprobes.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/kprobes.h')
-rw-r--r--include/linux/kprobes.h90
1 files changed, 88 insertions, 2 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 99ddba5a4e0..fba39f87efe 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -25,21 +25,31 @@
* 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 <linux/spinlock.h>
+
#include <asm/kprobes.h>
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;
@@ -85,6 +95,62 @@ struct jprobe {
kprobe_opcode_t *entry; /* probe handling code to jump to */
};
+#ifdef ARCH_SUPPORTS_KRETPROBES
+extern int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs);
+extern void trampoline_post_handler(struct kprobe *p, struct pt_regs *regs,
+ unsigned long flags);
+extern struct task_struct *arch_get_kprobe_task(void *ptr);
+extern void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs);
+extern void arch_kprobe_flush_task(struct task_struct *tk, spinlock_t *kp_lock);
+#else /* ARCH_SUPPORTS_KRETPROBES */
+static inline void kretprobe_trampoline(void)
+{
+}
+static inline int trampoline_probe_handler(struct kprobe *p,
+ struct pt_regs *regs)
+{
+ return 0;
+}
+static inline void trampoline_post_handler(struct kprobe *p,
+ struct pt_regs *regs, unsigned long flags)
+{
+}
+static inline void arch_prepare_kretprobe(struct kretprobe *rp,
+ struct pt_regs *regs)
+{
+}
+static inline void arch_kprobe_flush_task(struct task_struct *tk)
+{
+}
+#define arch_get_kprobe_task(ptr) ((struct task_struct *)NULL)
+#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;
+ void *ret_addr;
+ void *stack_addr;
+};
+
#ifdef CONFIG_KPROBES
/* Locks kprobe: irq must be disabled */
void lock_kprobes(void);
@@ -104,6 +170,7 @@ 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);
+struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
int register_kprobe(struct kprobe *p);
void unregister_kprobe(struct kprobe *p);
@@ -113,7 +180,16 @@ int register_jprobe(struct jprobe *p);
void unregister_jprobe(struct jprobe *p);
void jprobe_return(void);
-#else
+int register_kretprobe(struct kretprobe *rp);
+void unregister_kretprobe(struct kretprobe *rp);
+
+struct kretprobe_instance *get_free_rp_inst(struct kretprobe *rp);
+struct kretprobe_instance *get_rp_inst(void *sara);
+struct kretprobe_instance *get_rp_inst_tsk(struct task_struct *tk);
+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;
@@ -135,5 +211,15 @@ static inline void unregister_jprobe(struct jprobe *p)
static inline void jprobe_return(void)
{
}
-#endif
+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 */