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