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 extern int __init init_hw_breakpoint(void);
  37
  38 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
  39 {
  40         memset(attr, 0, sizeof(*attr));
  41
  42         attr->type = PERF_TYPE_BREAKPOINT;
  43         attr->size = sizeof(*attr);
  44         /*
  45          * As it's for in-kernel or ptrace use, we want it to be pinned
  46          * and to call its callback every hits.
  47          */
  48         attr->pinned = 1;
  49         attr->sample_period = 1;
  50 }
  51
  52 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
  53 {
  54         hw_breakpoint_init(attr);
  55         attr->exclude_kernel = 1;
  56 }
  57
  58 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
  59 {
  60         return bp->attr.bp_addr;
  61 }
  62
  63 static inline int hw_breakpoint_type(struct perf_event *bp)
  64 {
  65         return bp->attr.bp_type;
  66 }
  67
  68 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
  69 {
  70         return bp->attr.bp_len;
  71 }
  72
  73 extern struct perf_event *
  74 register_user_hw_breakpoint(struct perf_event_attr *attr,
  75                             perf_overflow_handler_t triggered,
  76                             void *context,
  77                             struct task_struct *tsk);
  78
  79 /* FIXME: only change from the attr, and don't unregister */
  80 extern int
  81 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
  82
  83 /*
  84  * Kernel breakpoints are not associated with any particular thread.
  85  */
  86 extern struct perf_event *
  87 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  88                                 perf_overflow_handler_t triggered,
  89                                 void *context,
  90                                 int cpu);
  91
  92 extern struct perf_event * __percpu *
  93 register_wide_hw_breakpoint(struct perf_event_attr *attr,
  94                             perf_overflow_handler_t triggered,
  95                             void *context);
  96
  97 extern int register_perf_hw_breakpoint(struct perf_event *bp);
  98 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  99 extern void unregister_hw_breakpoint(struct perf_event *bp);
 100 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
 101
 102 extern int dbg_reserve_bp_slot(struct perf_event *bp);
 103 extern int dbg_release_bp_slot(struct perf_event *bp);
 104 extern int reserve_bp_slot(struct perf_event *bp);
 105 extern void release_bp_slot(struct perf_event *bp);
 106
 107 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
 108
 109 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 110 {
 111         return &bp->hw.info;
 112 }
 113
 114 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
 115
 116 static inline int __init init_hw_breakpoint(void) { return 0; }
 117
 118 static inline struct perf_event *
 119 register_user_hw_breakpoint(struct perf_event_attr *attr,
 120                             perf_overflow_handler_t triggered,
 121                             void *context,
 122                             struct task_struct *tsk)    { return NULL; }
 123 static inline int
 124 modify_user_hw_breakpoint(struct perf_event *bp,
 125                           struct perf_event_attr *attr) { return -ENOSYS; }
 126 static inline struct perf_event *
 127 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
 128                                 perf_overflow_handler_t  triggered,
 129                                 void *context,
 130                                 int cpu)                { return NULL; }
 131 static inline struct perf_event * __percpu *
 132 register_wide_hw_breakpoint(struct perf_event_attr *attr,
 133                             perf_overflow_handler_t triggered,
 134                             void *context)              { return NULL; }
 135 static inline int
 136 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
 137 static inline int
 138 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
 139 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
 140 static inline void
 141 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
 142 static inline int
 143 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
 144 static inline void release_bp_slot(struct perf_event *bp)               { }
 145
 146 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
 147
 148 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 149 {
 150         return NULL;
 151 }
 152
 153 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 154 #endif /* __KERNEL__ */
 155
 156 #endif /* _LINUX_HW_BREAKPOINT_H */