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diff --git a/sys/ddb/db_sym.h b/sys/ddb/db_sym.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 
+ * 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 the
+ * rights to redistribute these changes.
+ *
+ *	$Id: db_sym.h,v 1.4 1994/08/18 22:34:26 wollman Exp $
+ */
+
+#ifndef _DDB_DB_SYM_H_
+#define _DDB_DB_SYM_H_ 1
+
+/*
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	8/90
+ */
+
+/*
+ * This module can handle multiple symbol tables
+ */
+typedef struct {
+	char		*name;		/* symtab name */
+	char		*start;		/* symtab location */
+	char		*end;
+	char		*private;	/* optional machdep pointer */
+} db_symtab_t;
+
+extern db_symtab_t	*db_last_symtab; /* where last symbol was found */
+
+/*
+ * Symbol representation is specific to the symtab style:
+ * BSD compilers use dbx' nlist, other compilers might use
+ * a different one
+ */
+typedef	char *		db_sym_t;	/* opaque handle on symbols */
+#define	DB_SYM_NULL	((db_sym_t)0)
+
+/*
+ * Non-stripped symbol tables will have duplicates, for instance
+ * the same string could match a parameter name, a local var, a
+ * global var, etc.
+ * We are most concern with the following matches.
+ */
+typedef int		db_strategy_t;	/* search strategy */
+
+#define	DB_STGY_ANY	0			/* anything goes */
+#define DB_STGY_XTRN	1			/* only external symbols */
+#define DB_STGY_PROC	2			/* only procedures */
+
+extern boolean_t	db_qualify_ambiguous_names;
+					/* if TRUE, check across symbol tables
+					 * for multiple occurrences of a name.
+					 * Might slow down quite a bit */
+
+/*
+ * Functions exported by the symtable module
+ */
+extern void	db_add_symbol_table();
+					/* extend the list of symbol tables */
+
+extern db_sym_t	db_search_symbol(/* db_expr_t, db_strategy_t, int* */);
+					/* find symbol given value */
+
+extern void	db_symbol_values(/* db_sym_t, char**, db_expr_t* */);
+					/* return name and value of symbol */
+
+#define db_find_sym_and_offset(val,namep,offp)	\
+	db_symbol_values(db_search_symbol(val,DB_STGY_ANY,offp),namep,0)
+					/* find name&value given approx val */
+
+#define db_find_xtrn_sym_and_offset(val,namep,offp)	\
+	db_symbol_values(db_search_symbol(val,DB_STGY_XTRN,offp),namep,0)
+					/* ditto, but no locals */
+
+extern int	db_eqname(/* char*, char*, char */);
+					/* strcmp, modulo leading char */
+
+extern void	db_printsym(/* db_expr_t, db_strategy_t */);
+					/* print closest symbol to a value */
+extern boolean_t db_line_at_pc(db_sym_t, char **, int *, db_expr_t);
+extern int X_db_sym_nymargs(db_symtab_t *, db_sym_t, int *, char **);
+
+#endif /* _DDB_DB_SYM_H_ */