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   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 unsigned long hw_breakpoint_addr(struct perf_event *bp)
  24 {
  25         return bp->attr.bp_addr;
  26 }
  27
  28 static inline int hw_breakpoint_type(struct perf_event *bp)
  29 {
  30         return bp->attr.bp_type;
  31 }
  32
  33 static inline int hw_breakpoint_len(struct perf_event *bp)
  34 {
  35         return bp->attr.bp_len;
  36 }
  37
  38 extern struct perf_event *
  39 register_user_hw_breakpoint(unsigned long addr,
  40                             int len,
  41                             int type,
  42                             perf_callback_t triggered,
  43                             struct task_struct *tsk,
  44                             bool active);
  45
  46 /* FIXME: only change from the attr, and don't unregister */
  47 extern struct perf_event *
  48 modify_user_hw_breakpoint(struct perf_event *bp,
  49                           unsigned long addr,
  50                           int len,
  51                           int type,
  52                           perf_callback_t triggered,
  53                           struct task_struct *tsk,
  54                           bool active);
  55
  56 /*
  57  * Kernel breakpoints are not associated with any particular thread.
  58  */
  59 extern struct perf_event *
  60 register_wide_hw_breakpoint_cpu(unsigned long addr,
  61                                 int len,
  62                                 int type,
  63                                 perf_callback_t triggered,
  64                                 int cpu,
  65                                 bool active);
  66
  67 extern struct perf_event **
  68 register_wide_hw_breakpoint(unsigned long addr,
  69                             int len,
  70                             int type,
  71                             perf_callback_t triggered,
  72                             bool active);
  73
  74 extern int register_perf_hw_breakpoint(struct perf_event *bp);
  75 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  76 extern void unregister_hw_breakpoint(struct perf_event *bp);
  77 extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
  78
  79 extern int reserve_bp_slot(struct perf_event *bp);
  80 extern void release_bp_slot(struct perf_event *bp);
  81
  82 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  83
  84 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
  85 {
  86         return &bp->hw.info;
  87 }
  88
  89 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
  90
  91 static inline struct perf_event *
  92 register_user_hw_breakpoint(unsigned long addr,
  93                             int len,
  94                             int type,
  95                             perf_callback_t triggered,
  96                             struct task_struct *tsk,
  97                             bool active)                { return NULL; }
  98 static inline struct perf_event *
  99 modify_user_hw_breakpoint(struct perf_event *bp,
 100                           unsigned long addr,
 101                           int len,
 102                           int type,
 103                           perf_callback_t triggered,
 104                           struct task_struct *tsk,
 105                           bool active)                  { return NULL; }
 106 static inline struct perf_event *
 107 register_wide_hw_breakpoint_cpu(unsigned long addr,
 108                                 int len,
 109                                 int type,
 110                                 perf_callback_t triggered,
 111                                 int cpu,
 112                                 bool active)            { return NULL; }
 113 static inline struct perf_event **
 114 register_wide_hw_breakpoint(unsigned long addr,
 115                             int len,
 116                             int type,
 117                             perf_callback_t triggered,
 118                             bool active)                { return NULL; }
 119 static inline int
 120 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
 121 static inline int
 122 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
 123 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
 124 static inline void
 125 unregister_wide_hw_breakpoint(struct perf_event **cpu_events)           { }
 126 static inline int
 127 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
 128 static inline void release_bp_slot(struct perf_event *bp)               { }
 129
 130 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
 131
 132 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 133 {
 134         return NULL;
 135 }
 136
 137 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 138 #endif /* __KERNEL__ */
 139
 140 #endif /* _LINUX_HW_BREAKPOINT_H */