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 enum bp_type_idx {
  21         TYPE_INST       = 0,
  22 #ifdef CONFIG_HAVE_MIXED_BREAKPOINTS_REGS
  23         TYPE_DATA       = 0,
  24 #else
  25         TYPE_DATA       = 1,
  26 #endif
  27         TYPE_MAX
  28 };
  29
  30 #ifdef __KERNEL__
  31
  32 #include <linux/perf_event.h>
  33
  34 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  35
  36 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
  37 {
  38         memset(attr, 0, sizeof(*attr));
  39
  40         attr->type = PERF_TYPE_BREAKPOINT;
  41         attr->size = sizeof(*attr);
  42         /*
  43          * As it's for in-kernel or ptrace use, we want it to be pinned
  44          * and to call its callback every hits.
  45          */
  46         attr->pinned = 1;
  47         attr->sample_period = 1;
  48 }
  49
  50 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
  51 {
  52         hw_breakpoint_init(attr);
  53         attr->exclude_kernel = 1;
  54 }
  55
  56 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
  57 {
  58         return bp->attr.bp_addr;
  59 }
  60
  61 static inline int hw_breakpoint_type(struct perf_event *bp)
  62 {
  63         return bp->attr.bp_type;
  64 }
  65
  66 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
  67 {
  68         return bp->attr.bp_len;
  69 }
  70
  71 extern struct perf_event *
  72 register_user_hw_breakpoint(struct perf_event_attr *attr,
  73                             perf_overflow_handler_t triggered,
  74                             struct task_struct *tsk);
  75
  76 /* FIXME: only change from the attr, and don't unregister */
  77 extern int
  78 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
  79
  80 /*
  81  * Kernel breakpoints are not associated with any particular thread.
  82  */
  83 extern struct perf_event *
  84 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  85                                 perf_overflow_handler_t triggered,
  86                                 int cpu);
  87
  88 extern struct perf_event * __percpu *
  89 register_wide_hw_breakpoint(struct perf_event_attr *attr,
  90                             perf_overflow_handler_t triggered);
  91
  92 extern int register_perf_hw_breakpoint(struct perf_event *bp);
  93 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  94 extern void unregister_hw_breakpoint(struct perf_event *bp);
  95 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
  96
  97 extern int dbg_reserve_bp_slot(struct perf_event *bp);
  98 extern int dbg_release_bp_slot(struct perf_event *bp);
  99 extern int reserve_bp_slot(struct perf_event *bp);
 100 extern void release_bp_slot(struct perf_event *bp);
 101
 102 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
 103
 104 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 105 {
 106         return &bp->hw.info;
 107 }
 108
 109 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
 110
 111 static inline struct perf_event *
 112 register_user_hw_breakpoint(struct perf_event_attr *attr,
 113                             perf_overflow_handler_t triggered,
 114                             struct task_struct *tsk)    { return NULL; }
 115 static inline int
 116 modify_user_hw_breakpoint(struct perf_event *bp,
 117                           struct perf_event_attr *attr) { return -ENOSYS; }
 118 static inline struct perf_event *
 119 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
 120                                 perf_overflow_handler_t  triggered,
 121                                 int cpu)                { return NULL; }
 122 static inline struct perf_event * __percpu *
 123 register_wide_hw_breakpoint(struct perf_event_attr *attr,
 124                             perf_overflow_handler_t triggered)  { return NULL; }
 125 static inline int
 126 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
 127 static inline int
 128 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
 129 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
 130 static inline void
 131 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
 132 static inline int
 133 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
 134 static inline void release_bp_slot(struct perf_event *bp)               { }
 135
 136 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
 137
 138 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 139 {
 140         return NULL;
 141 }
 142
 143 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 144 #endif /* __KERNEL__ */
 145
 146 #endif /* _LINUX_HW_BREAKPOINT_H */