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diff --git a/ddb/db_break.h b/ddb/db_break.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	Author: David B. Golub, Carnegie Mellon University
+ *	Date:	7/90
+ */
+#ifndef	_DDB_DB_BREAK_H_
+#define	_DDB_DB_BREAK_H_
+
+#include <machine/db_machdep.h>
+#include <kern/thread.h>
+#include <kern/task.h>
+#include <mach/boolean.h>
+
+/*
+ * thread list at the same breakpoint address
+ */
+struct db_thread_breakpoint {
+	vm_offset_t tb_task_thd;		/* target task or thread */
+	boolean_t tb_is_task;			/* task qualified */
+	short	 tb_number;			/* breakpoint number */
+	short	 tb_init_count;			/* skip count(initial value) */
+	short	 tb_count;			/* current skip count */
+	short	 tb_cond;			/* break condition */
+	struct	 db_thread_breakpoint *tb_next;	/* next chain */
+};
+
+typedef struct db_thread_breakpoint *db_thread_breakpoint_t;
+
+/*
+ * Breakpoint.
+ */
+
+struct db_breakpoint {
+	task_t	  task;			/* target task */
+	db_addr_t address;		/* set here */
+	db_thread_breakpoint_t threads; /* thread */
+	int	flags;			/* flags: */
+#define	BKPT_SINGLE_STEP	0x2	/* to simulate single step */
+#define	BKPT_TEMP		0x4	/* temporary */
+#define BKPT_USR_GLOBAL		0x8	/* global user space break point */
+#define BKPT_SET_IN_MEM		0x10	/* break point is set in memory */
+#define BKPT_1ST_SET		0x20	/* 1st time set of user global bkpt */
+	vm_size_t	bkpt_inst;	/* saved instruction at bkpt */
+	struct db_breakpoint *link;	/* link in in-use or free chain */
+};
+
+typedef struct db_breakpoint *db_breakpoint_t;
+
+extern db_breakpoint_t	db_find_breakpoint( task_t task, db_addr_t addr);
+extern boolean_t	db_find_breakpoint_here( task_t task, db_addr_t addr);
+extern void		db_set_breakpoints();
+extern void		db_clear_breakpoints();
+extern db_thread_breakpoint_t	db_find_thread_breakpoint_here
+					( task_t task, db_addr_t addr );
+extern db_thread_breakpoint_t	db_find_breakpoint_number
+					( int num, db_breakpoint_t *bkptp);
+
+extern db_breakpoint_t	db_set_temp_breakpoint( task_t task, db_addr_t addr);
+extern void		db_delete_temp_breakpoint
+					( task_t task, db_breakpoint_t bkpt);
+
+#endif	_DDB_DB_BREAK_H_