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 */ 157