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         memset(attr, 0, sizeof(*attr));
  26
  27         attr->type = PERF_TYPE_BREAKPOINT;
  28         attr->size = sizeof(*attr);
  29         /*
  30          * As it's for in-kernel or ptrace use, we want it to be pinned
  31          * and to call its callback every hits.
  32          */
  33         attr->pinned = 1;
  34         attr->sample_period = 1;
  35 }
  36
  37 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
  38 {
  39         return bp->attr.bp_addr;
  40 }
  41
  42 static inline int hw_breakpoint_type(struct perf_event *bp)
  43 {
  44         return bp->attr.bp_type;
  45 }
  46
  47 static inline int hw_breakpoint_len(struct perf_event *bp)
  48 {
  49         return bp->attr.bp_len;
  50 }
  51
  52 extern struct perf_event *
  53 register_user_hw_breakpoint(struct perf_event_attr *attr,
  54                             perf_overflow_handler_t triggered,
  55                             struct task_struct *tsk);
  56
  57 /* FIXME: only change from the attr, and don't unregister */
  58 extern struct perf_event *
  59 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
  60
  61 /*
  62  * Kernel breakpoints are not associated with any particular thread.
  63  */
  64 extern struct perf_event *
  65 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  66                                 perf_overflow_handler_t triggered,
  67                                 int cpu);
  68
  69 extern struct perf_event **
  70 register_wide_hw_breakpoint(struct perf_event_attr *attr,
  71                             perf_overflow_handler_t triggered);
  72
  73 extern int register_perf_hw_breakpoint(struct perf_event *bp);
  74 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  75 extern void unregister_hw_breakpoint(struct perf_event *bp);
  76 extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
  77
  78 extern int reserve_bp_slot(struct perf_event *bp);
  79 extern void release_bp_slot(struct perf_event *bp);
  80
  81 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  82
  83 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
  84 {
  85         return &bp->hw.info;
  86 }
  87
  88 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
  89
  90 static inline struct perf_event *
  91 register_user_hw_breakpoint(struct perf_event_attr *attr,
  92                             perf_overflow_handler_t triggered,
  93                             struct task_struct *tsk)    { return NULL; }
  94 static inline struct perf_event *
  95 modify_user_hw_breakpoint(struct perf_event *bp,
  96                           struct perf_event_attr *attr) { return NULL; }
  97 static inline struct perf_event *
  98 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  99                                 perf_overflow_handler_t  triggered,
 100                                 int cpu)                { return NULL; }
 101 static inline struct perf_event **
 102 register_wide_hw_breakpoint(struct perf_event_attr *attr,
 103                             perf_overflow_handler_t triggered)  { return NULL; }
 104 static inline int
 105 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
 106 static inline int
 107 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
 108 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
 109 static inline void
 110 unregister_wide_hw_breakpoint(struct perf_event **cpu_events)           { }
 111 static inline int
 112 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
 113 static inline void release_bp_slot(struct perf_event *bp)               { }
 114
 115 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
 116
 117 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 118 {
 119         return NULL;
 120 }
 121
 122 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 123 #endif /* __KERNEL__ */
 124
 125 #endif /* _LINUX_HW_BREAKPOINT_H */