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diff --git a/util/debug.h b/util/debug.h
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+/* 
+ * Copyright (c) 1995-1993 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+/*
+ *	File:	debug.h
+ *	Author:	Bryan Ford
+ *
+ *	This file contains definitions for kernel debugging,
+ *	which are compiled in on the DEBUG symbol.
+ *
+ */
+#ifndef _MACH_UTIL_DEBUG_H_
+#define _MACH_UTIL_DEBUG_H_
+
+#include <mach/macro_help.h>
+
+
+#ifdef DEBUG
+
+extern void panic(const char *fmt, ...);
+
+#define here() printf("@ %s:%d\n", __FILE__, __LINE__)
+#define message(args) ({ printf("@ %s:%d: ", __FILE__, __LINE__); printf args; printf("\n"); })
+
+#define otsan() panic("%s:%d: off the straight and narrow!", __FILE__, __LINE__)
+
+#define assert(v)							\
+	MACRO_BEGIN							\
+		if (!(v))						\
+			panic("%s:%d: failed assertion `"#v"'\n",	\
+				__FILE__, __LINE__);			\
+	MACRO_END
+
+#define do_debug(stmt) stmt
+
+#define debugmsg(args) \
+	({ printf("%s:%d: ", __FILE__, __LINE__); printf args; printf("\n"); })
+
+#define struct_id_decl		unsigned struct_id;
+#define struct_id_init(p,id)	((p)->struct_id = (id))
+#define struct_id_denit(p)	((p)->struct_id = 0)
+#define struct_id_verify(p,id) \
+	({ if ((p)->struct_id != (id)) \
+		panic("%s:%d: "#p" (%08x) struct_id should be "#id" (%08x), is %08x\n", \
+			__FILE__, __LINE__, (p), (id), (p->struct_id)); \
+	})
+
+#else !DEBUG
+
+#define otsan()
+#define assert(v)
+#define do_debug(stmt)
+#define debugmsg(args)
+
+#define struct_id_decl
+#define struct_id_init(p,id)
+#define struct_id_denit(p)
+#define struct_id_verify(p,id)
+
+#endif !DEBUG
+
+#endif _MACH_UTIL_DEBUG_H_