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 */ 132