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diff --git a/i386/util/trap.h b/i386/util/trap.h
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University.
+ * Copyright (c) 1994 The University of Utah and
+ * the Center for Software Science (CSS).
+ * 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, THE UNIVERSITY OF UTAH AND CSS ALLOW FREE USE OF
+ * THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM 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.
+ */
+#ifndef _I386_MOSS_TRAP_H_
+#define _I386_MOSS_TRAP_H_
+
+#ifndef ASSEMBLER
+
+
+/* This structure corresponds to the state of user registers
+   as saved upon kernel trap/interrupt entry.
+   As always, it is only a default implementation;
+   a well-optimized microkernel will probably want to override it
+   with something that allows better optimization.  */
+
+struct trap_state {
+
+	/* Saved segment registers */
+	unsigned int	gs;
+	unsigned int	fs;
+	unsigned int	es;
+	unsigned int	ds;
+
+	/* PUSHA register state frame */
+	unsigned int	edi;
+	unsigned int	esi;
+	unsigned int	ebp;
+	unsigned int	cr2;	/* we save cr2 over esp for page faults */
+	unsigned int	ebx;
+	unsigned int	edx;
+	unsigned int	ecx;
+	unsigned int	eax;
+
+	unsigned int	trapno;
+	unsigned int	err;
+
+	/* Processor state frame */
+	unsigned int	eip;
+	unsigned int	cs;
+	unsigned int	eflags;
+	unsigned int	esp;
+	unsigned int	ss;
+
+	/* Virtual 8086 segment registers */
+	unsigned int	v86_es;
+	unsigned int	v86_ds;
+	unsigned int	v86_fs;
+	unsigned int	v86_gs;
+};
+
+/* The actual trap_state frame pushed by the processor
+   varies in size depending on where the trap came from.  */
+#define TR_KSIZE	((int)&((struct trap_state*)0)->esp)
+#define TR_USIZE	((int)&((struct trap_state*)0)->v86_es)
+#define TR_V86SIZE	sizeof(struct trap_state)
+
+
+#else ASSEMBLER
+
+#include <mach/machine/asm.h>
+
+#define UNEXPECTED_TRAP				\
+	movw	%ss,%ax				;\
+	movw	%ax,%ds				;\
+	movw	%ax,%es				;\
+	movl	%esp,%eax			;\
+	pushl	%eax				;\
+	call	EXT(trap_dump_die)		;\
+
+
+#endif ASSEMBLER
+
+#include <mach/machine/trap.h>
+
+#endif _I386_MOSS_TRAP_H_