1 files changed, 125 insertions, 0 deletions

diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
new file mode 100644
index 000000000000..69f07a9f1277
--- /dev/null
+++ b/include/linux/hw_breakpoint.h
@@ -0,0 +1,125 @@
+#ifndef _LINUX_HW_BREAKPOINT_H
+#define _LINUX_HW_BREAKPOINT_H
+
+enum {
+        HW_BREAKPOINT_LEN_1 = 1,
+        HW_BREAKPOINT_LEN_2 = 2,
+        HW_BREAKPOINT_LEN_4 = 4,
+        HW_BREAKPOINT_LEN_8 = 8,
+};
+
+enum {
+        HW_BREAKPOINT_R = 1,
+        HW_BREAKPOINT_W = 2,
+        HW_BREAKPOINT_X = 4,
+};
+
+#ifdef __KERNEL__
+
+#include <linux/perf_event.h>
+
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+
+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 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 int 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,
+                            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,
+                                int cpu);
+
+extern struct perf_event **
+register_wide_hw_breakpoint(struct perf_event_attr *attr,
+                            perf_overflow_handler_t triggered);
+
+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 **cpu_events);
+
+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 struct perf_event *
+register_user_hw_breakpoint(struct perf_event_attr *attr,
+                            perf_overflow_handler_t triggered,
+                            struct task_struct *tsk)    { return NULL; }
+static inline int
+modify_user_hw_breakpoint(struct perf_event *bp,
+                          struct perf_event_attr *attr) { return NULL; }
+static inline struct perf_event *
+register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
+                                perf_overflow_handler_t  triggered,
+                                int cpu)                { return NULL; }
+static inline struct perf_event **
+register_wide_hw_breakpoint(struct perf_event_attr *attr,
+                            perf_overflow_handler_t triggered)  { 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 **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 /* __KERNEL__ */
+
+#endif /* _LINUX_HW_BREAKPOINT_H */