* <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/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_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;
/* 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;
*/
struct jprobe {
struct kprobe kp;
- kprobe_opcode_t *entry; /* probe handling code to jump to */
+ void *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);
-#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)
-{
-}
+/* 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 void arch_kprobe_flush_task(struct task_struct *tk)
+static inline int arch_trampoline_kprobe(struct kprobe *p)
{
+ return 0;
}
-#define arch_get_kprobe_task(ptr) ((struct task_struct *)NULL)
-#endif /* ARCH_SUPPORTS_KRETPROBES */
+#endif /* CONFIG_KRETPROBES */
/*
* Function-return probe -
* Note:
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;
struct hlist_head used_instances;
};
struct hlist_node uflist; /* either on free list or used list */
struct hlist_node hlist;
struct kretprobe *rp;
- void *ret_addr;
- void *stack_addr;
+ kprobe_opcode_t *ret_addr;
+ struct task_struct *task;
+ char data[0];
};
-#ifdef CONFIG_KPROBES
-/* Locks kprobe: irq must be disabled */
-void lock_kprobes(void);
-void unlock_kprobes(void);
+struct kretprobe_blackpoint {
+ const char *name;
+ void *addr;
+};
+extern struct kretprobe_blackpoint kretprobe_blacklist[];
-/* kprobe running now on this CPU? */
-static inline int kprobe_running(void)
+static inline void kretprobe_assert(struct kretprobe_instance *ri,
+ unsigned long orig_ret_address, unsigned long trampoline_address)
{
- extern unsigned int kprobe_cpu;
- return kprobe_cpu == smp_processor_id();
+ 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 spinlock_t kretprobe_lock;
+extern struct mutex kprobe_mutex;
extern int arch_prepare_kprobe(struct kprobe *p);
-extern void arch_copy_kprobe(struct kprobe *p);
extern void arch_arm_kprobe(struct kprobe *p);
extern void arch_disarm_kprobe(struct kprobe *p);
-extern void arch_remove_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);
+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). Must have called lock_kprobes */
+/* 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 register_jprobe(struct jprobe *p);
void unregister_jprobe(struct jprobe *p);
void jprobe_return(void);
+unsigned long arch_deref_entry_point(void *);
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);
+void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
+
#else /* CONFIG_KPROBES */
-static inline int kprobe_running(void)
+
+#define __kprobes /**/
+struct jprobe;
+struct kretprobe;
+
+static inline struct kprobe *kprobe_running(void)
{
- return 0;
+ return NULL;
}
static inline int register_kprobe(struct kprobe *p)
{
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