1 files changed, 127 insertions, 0 deletions

diff --git a/kernel/include/linux/hw_breakpoint.h b/kernel/include/linux/hw_breakpoint.h
new file mode 100644
index 000000000..0464c85e6
--- /dev/null
+++ b/kernel/include/linux/hw_breakpoint.h
@@ -0,0 +1,127 @@
+#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
+
+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);
+
+/*
+ * 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 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 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 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 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 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 */