1#ifndef _LINUX_HW_BREAKPOINT_H 2#define _LINUX_HW_BREAKPOINT_H 3 4enum { 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 11enum { 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 20enum 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 36static 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 50static inline void ptrace_breakpoint_init(struct perf_event_attr *attr) 51{ 52 hw_breakpoint_init(attr); 53 attr->exclude_kernel = 1; 54} 55 56static inline unsigned long hw_breakpoint_addr(struct perf_event *bp) 57{ 58 return bp->attr.bp_addr; 59} 60 61static inline int hw_breakpoint_type(struct perf_event *bp) 62{ 63 return bp->attr.bp_type; 64} 65 66static inline unsigned long hw_breakpoint_len(struct perf_event *bp) 67{ 68 return bp->attr.bp_len; 69} 70 71extern struct perf_event * 72register_user_hw_breakpoint(struct perf_event_attr *attr, 73 perf_overflow_handler_t triggered, 74 struct task_struct *tsk); 75 76extern int 77modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr); 78 79/* 80 * Kernel breakpoints are not associated with any particular thread. 81 */ 82extern struct perf_event * 83register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, 84 perf_overflow_handler_t triggered, 85 int cpu); 86 87extern struct perf_event * __percpu * 88register_wide_hw_breakpoint(struct perf_event_attr *attr, 89 perf_overflow_handler_t triggered); 90 91extern int register_perf_hw_breakpoint(struct perf_event *bp); 92extern int __register_perf_hw_breakpoint(struct perf_event *bp); 93extern void unregister_hw_breakpoint(struct perf_event *bp); 94extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events); 95 96extern int dbg_reserve_bp_slot(struct perf_event *bp); 97extern int dbg_release_bp_slot(struct perf_event *bp); 98extern int reserve_bp_slot(struct perf_event *bp); 99extern void release_bp_slot(struct perf_event *bp); 100 101extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); 102 103static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp) 104{ 105 return &bp->hw.info; 106} 107 108#else /* !CONFIG_HAVE_HW_BREAKPOINT */ 109 110static inline struct perf_event * 111register_user_hw_breakpoint(struct perf_event_attr *attr, 112 perf_overflow_handler_t triggered, 113 struct task_struct *tsk) { return NULL; } 114static inline int 115modify_user_hw_breakpoint(struct perf_event *bp, 116 struct perf_event_attr *attr) { return -ENOSYS; } 117static inline struct perf_event * 118register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, 119 perf_overflow_handler_t triggered, 120 int cpu) { return NULL; } 121static inline struct perf_event * __percpu * 122register_wide_hw_breakpoint(struct perf_event_attr *attr, 123 perf_overflow_handler_t triggered) { return NULL; } 124static inline int 125register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; } 126static inline int 127__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; } 128static inline void unregister_hw_breakpoint(struct perf_event *bp) { } 129static inline void 130unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { } 131static inline int 132reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; } 133static inline void release_bp_slot(struct perf_event *bp) { } 134 135static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { } 136 137static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp) 138{ 139 return NULL; 140} 141 142#endif /* CONFIG_HAVE_HW_BREAKPOINT */ 143#endif /* __KERNEL__ */ 144 145#endif /* _LINUX_HW_BREAKPOINT_H */ 146