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