diff options
Diffstat (limited to 'include/linux/hw_breakpoint.h')
| -rw-r--r-- | include/linux/hw_breakpoint.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h new file mode 100644 index 000000000..db199d653 --- /dev/null +++ b/include/linux/hw_breakpoint.h @@ -0,0 +1,145 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_HW_BREAKPOINT_H +#define _LINUX_HW_BREAKPOINT_H + +#include <linux/perf_event.h> +#include <uapi/linux/hw_breakpoint.h> + +#ifdef CONFIG_HAVE_HW_BREAKPOINT + +enum bp_type_idx { + TYPE_INST = 0, +#if defined(CONFIG_HAVE_MIXED_BREAKPOINTS_REGS) + TYPE_DATA = 0, +#else + TYPE_DATA = 1, +#endif + TYPE_MAX +}; + +extern int __init init_hw_breakpoint(void); + +static inline void hw_breakpoint_init(struct perf_event_attr *attr) +{ + memset(attr, 0, sizeof(*attr)); + + attr->type = PERF_TYPE_BREAKPOINT; + attr->size = sizeof(*attr); + /* + * As it's for in-kernel or ptrace use, we want it to be pinned + * and to call its callback every hits. + */ + attr->pinned = 1; + attr->sample_period = 1; +} + +static inline void ptrace_breakpoint_init(struct perf_event_attr *attr) +{ + hw_breakpoint_init(attr); + attr->exclude_kernel = 1; +} + +static inline unsigned long hw_breakpoint_addr(struct perf_event *bp) +{ + return bp->attr.bp_addr; +} + +static inline int hw_breakpoint_type(struct perf_event *bp) +{ + return bp->attr.bp_type; +} + +static inline unsigned long hw_breakpoint_len(struct perf_event *bp) +{ + return bp->attr.bp_len; +} + +extern struct perf_event * +register_user_hw_breakpoint(struct perf_event_attr *attr, + perf_overflow_handler_t triggered, + void *context, + struct task_struct *tsk); + +/* FIXME: only change from the attr, and don't unregister */ +extern int +modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr); +extern int +modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr, + bool check); + +/* + * Kernel breakpoints are not associated with any particular thread. + */ +extern struct perf_event * +register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, + perf_overflow_handler_t triggered, + void *context, + int cpu); + +extern struct perf_event * __percpu * +register_wide_hw_breakpoint(struct perf_event_attr *attr, + perf_overflow_handler_t triggered, + void *context); + +extern int register_perf_hw_breakpoint(struct perf_event *bp); +extern void unregister_hw_breakpoint(struct perf_event *bp); +extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events); +extern bool hw_breakpoint_is_used(void); + +extern int dbg_reserve_bp_slot(struct perf_event *bp); +extern int dbg_release_bp_slot(struct perf_event *bp); +extern int reserve_bp_slot(struct perf_event *bp); +extern void release_bp_slot(struct perf_event *bp); + +extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); + +static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp) +{ + return &bp->hw.info; +} + +#else /* !CONFIG_HAVE_HW_BREAKPOINT */ + +static inline int __init init_hw_breakpoint(void) { return 0; } + +static inline struct perf_event * +register_user_hw_breakpoint(struct perf_event_attr *attr, + perf_overflow_handler_t triggered, + void *context, + struct task_struct *tsk) { return NULL; } +static inline int +modify_user_hw_breakpoint(struct perf_event *bp, + struct perf_event_attr *attr) { return -ENOSYS; } +static inline int +modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr, + bool check) { return -ENOSYS; } + +static inline struct perf_event * +register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, + perf_overflow_handler_t triggered, + void *context, + int cpu) { return NULL; } +static inline struct perf_event * __percpu * +register_wide_hw_breakpoint(struct perf_event_attr *attr, + perf_overflow_handler_t triggered, + void *context) { return NULL; } +static inline int +register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; } +static inline void unregister_hw_breakpoint(struct perf_event *bp) { } +static inline void +unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { } +static inline bool hw_breakpoint_is_used(void) { return false; } + +static inline int +reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; } +static inline void release_bp_slot(struct perf_event *bp) { } + +static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { } + +static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp) +{ + return NULL; +} + +#endif /* CONFIG_HAVE_HW_BREAKPOINT */ +#endif /* _LINUX_HW_BREAKPOINT_H */ |