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_EMPTY     = 0,
  13         HW_BREAKPOINT_R         = 1,
  14         HW_BREAKPOINT_W         = 2,
  15         HW_BREAKPOINT_RW        = HW_BREAKPOINT_R | HW_BREAKPOINT_W,
  16         HW_BREAKPOINT_X         = 4,
  17         HW_BREAKPOINT_INVALID   = HW_BREAKPOINT_RW | HW_BREAKPOINT_X,
  18 };
  19
  20 #ifdef __KERNEL__
  21
  22 #include <linux/perf_event.h>
  23
  24 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  25
  26 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
  27 {
  28         memset(attr, 0, sizeof(*attr));
  29
  30         attr->type = PERF_TYPE_BREAKPOINT;
  31         attr->size = sizeof(*attr);
  32         /*
  33          * As it's for in-kernel or ptrace use, we want it to be pinned
  34          * and to call its callback every hits.
  35          */
  36         attr->pinned = 1;
  37         attr->sample_period = 1;
  38 }
  39
  40 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
  41 {
  42         hw_breakpoint_init(attr);
  43         attr->exclude_kernel = 1;
  44 }
  45
  46 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
  47 {
  48         return bp->attr.bp_addr;
  49 }
  50
  51 static inline int hw_breakpoint_type(struct perf_event *bp)
  52 {
  53         return bp->attr.bp_type;
  54 }
  55
  56 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
  57 {
  58         return bp->attr.bp_len;
  59 }
  60
  61 extern struct perf_event *
  62 register_user_hw_breakpoint(struct perf_event_attr *attr,
  63                             perf_overflow_handler_t triggered,
  64                             struct task_struct *tsk);
  65
  66 /* FIXME: only change from the attr, and don't unregister */
  67 extern int
  68 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
  69
  70 /*
  71  * Kernel breakpoints are not associated with any particular thread.
  72  */
  73 extern struct perf_event *
  74 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  75                                 perf_overflow_handler_t triggered,
  76                                 int cpu);
  77
  78 extern struct perf_event * __percpu *
  79 register_wide_hw_breakpoint(struct perf_event_attr *attr,
  80                             perf_overflow_handler_t triggered);
  81
  82 extern int register_perf_hw_breakpoint(struct perf_event *bp);
  83 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  84 extern void unregister_hw_breakpoint(struct perf_event *bp);
  85 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
  86
  87 extern int dbg_reserve_bp_slot(struct perf_event *bp);
  88 extern int dbg_release_bp_slot(struct perf_event *bp);
  89 extern int reserve_bp_slot(struct perf_event *bp);
  90 extern void release_bp_slot(struct perf_event *bp);
  91
  92 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  93
  94 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
  95 {
  96         return &bp->hw.info;
  97 }
  98
  99 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
 100
 101 static inline struct perf_event *
 102 register_user_hw_breakpoint(struct perf_event_attr *attr,
 103                             perf_overflow_handler_t triggered,
 104                             struct task_struct *tsk)    { return NULL; }
 105 static inline int
 106 modify_user_hw_breakpoint(struct perf_event *bp,
 107                           struct perf_event_attr *attr) { return -ENOSYS; }
 108 static inline struct perf_event *
 109 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
 110                                 perf_overflow_handler_t  triggered,
 111                                 int cpu)                { return NULL; }
 112 static inline struct perf_event * __percpu *
 113 register_wide_hw_breakpoint(struct perf_event_attr *attr,
 114                             perf_overflow_handler_t triggered)  { return NULL; }
 115 static inline int
 116 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
 117 static inline int
 118 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
 119 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
 120 static inline void
 121 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
 122 static inline int
 123 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
 124 static inline void release_bp_slot(struct perf_event *bp)               { }
 125
 126 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
 127
 128 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 129 {
 130         return NULL;
 131 }
 132
 133 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 134 #endif /* __KERNEL__ */
 135
 136 #endif /* _LINUX_HW_BREAKPOINT_H */