SAFE public projects git trees. - safe/jmp/linux-2.6/blob - include/linux/hw_breakpoint.h

   1 #ifndef _LINUX_HW_BREAKPOINT_H
   2 #define _LINUX_HW_BREAKPOINT_H
   3
   4 enum {
   5         HW_BREAKPOINT_LEN_1 = 1,
   6         HW_BREAKPOINT_LEN_2 = 2,
   7         HW_BREAKPOINT_LEN_4 = 4,
   8         HW_BREAKPOINT_LEN_8 = 8,
   9 };
  10
  11 enum {
  12         HW_BREAKPOINT_R = 1,
  13         HW_BREAKPOINT_W = 2,
  14         HW_BREAKPOINT_X = 4,
  15 };
  16
  17 #ifdef __KERNEL__
  18
  19 #include <linux/perf_event.h>
  20
  21 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  22
  23 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
  24 {
  25         attr->type = PERF_TYPE_BREAKPOINT;
  26         attr->size = sizeof(*attr);
  27         /*
  28          * As it's for in-kernel or ptrace use, we want it to be pinned
  29          * and to call its callback every hits.
  30          */
  31         attr->pinned = 1;
  32         attr->sample_period = 1;
  33 }
  34
  35 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
  36 {
  37         return bp->attr.bp_addr;
  38 }
  39
  40 static inline int hw_breakpoint_type(struct perf_event *bp)
  41 {
  42         return bp->attr.bp_type;
  43 }
  44
  45 static inline int hw_breakpoint_len(struct perf_event *bp)
  46 {
  47         return bp->attr.bp_len;
  48 }
  49
  50 extern struct perf_event *
  51 register_user_hw_breakpoint(struct perf_event_attr *attr,
  52                             perf_overflow_handler_t triggered,
  53                             struct task_struct *tsk);
  54
  55 /* FIXME: only change from the attr, and don't unregister */
  56 extern struct perf_event *
  57 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
  58
  59 /*
  60  * Kernel breakpoints are not associated with any particular thread.
  61  */
  62 extern struct perf_event *
  63 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  64                                 perf_overflow_handler_t triggered,
  65                                 int cpu);
  66
  67 extern struct perf_event **
  68 register_wide_hw_breakpoint(struct perf_event_attr *attr,
  69                             perf_overflow_handler_t triggered);
  70
  71 extern int register_perf_hw_breakpoint(struct perf_event *bp);
  72 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  73 extern void unregister_hw_breakpoint(struct perf_event *bp);
  74 extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
  75
  76 extern int reserve_bp_slot(struct perf_event *bp);
  77 extern void release_bp_slot(struct perf_event *bp);
  78
  79 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  80
  81 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
  82 {
  83         return &bp->hw.info;
  84 }
  85
  86 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
  87
  88 static inline struct perf_event *
  89 register_user_hw_breakpoint(struct perf_event_attr *attr,
  90                             perf_overflow_handler_t triggered,
  91                             struct task_struct *tsk)    { return NULL; }
  92 static inline struct perf_event *
  93 modify_user_hw_breakpoint(struct perf_event *bp,
  94                           struct perf_event_attr *attr) { return NULL; }
  95 static inline struct perf_event *
  96 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  97                                 perf_overflow_handler_t  triggered,
  98                                 int cpu)                { return NULL; }
  99 static inline struct perf_event **
 100 register_wide_hw_breakpoint(struct perf_event_attr *attr,
 101                             perf_overflow_handler_t triggered)  { return NULL; }
 102 static inline int
 103 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
 104 static inline int
 105 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
 106 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
 107 static inline void
 108 unregister_wide_hw_breakpoint(struct perf_event **cpu_events)           { }
 109 static inline int
 110 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
 111 static inline void release_bp_slot(struct perf_event *bp)               { }
 112
 113 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
 114
 115 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 116 {
 117         return NULL;
 118 }
 119
 120 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 121 #endif /* __KERNEL__ */
 122
 123 #endif /* _LINUX_HW_BREAKPOINT_H */