nlist.c revision 1.14 
1/*	$NetBSD: nlist.c,v 1.14 1996/09/30 18:27:02 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
5 * Copyright (c) 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38#if 0
39static char sccsid[] = "from: @(#)nlist.c	8.1 (Berkeley) 6/6/93";
40#else
41static char *rcsid = "$NetBSD: nlist.c,v 1.14 1996/09/30 18:27:02 thorpej Exp $";
42#endif
43#endif /* not lint */
44
45#include <sys/param.h>
46
47#include <a.out.h>
48#include <db.h>
49#include <err.h>
50#include <errno.h>
51#include <fcntl.h>
52#include <kvm.h>
53#include <limits.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59#include "extern.h"
60
61static struct {
62        int     (*knlist) __P((const char *, DB *));
63} knlist_fmts[] = {
64#ifdef NLIST_AOUT
65        {       create_knlist_aout          },
66#endif
67#ifdef NLIST_ECOFF
68        {       create_knlist_ecoff         },
69#endif
70#ifdef NLIST_ELF32
71        {       create_knlist_elf32         },
72#endif
73#ifdef NLIST_ELF64
74        {       create_knlist_elf64         },
75#endif
76};
77
78void
79create_knlist(name, db)
80	const char *name;
81	DB *db;
82{
83	int i;
84
85        for (i = 0; i < sizeof(knlist_fmts) / sizeof(knlist_fmts[0]); i++)
86                if ((*knlist_fmts[i].knlist)(name, db) != -1)
87                        return;
88	warnx("%s: file format not recognized", name);
89	punt();
90}
91
92/*
93 * XXX: Using this value from machine/param.h introduces a
94 * XXX: machine dependency on this program, so /usr can not
95 * XXX: be shared between (i.e.) several m68k machines.
96 * Instead of compiling in KERNTEXTOFF or KERNBASE, try to
97 * determine the text start address from a standard symbol.
98 * For backward compatibility, use the old compiled-in way
99 * when the standard symbol name is not found.
100 */
101#ifndef KERNTEXTOFF
102#define KERNTEXTOFF KERNBASE
103#endif
104
105u_long
106get_kerntext(name)
107	const char *name;
108{
109	struct nlist nl[2];
110
111	bzero((caddr_t)nl, sizeof(nl));
112	nl[0].n_un.n_name = "_kernel_text";
113
114	if (nlist(name, nl) != 0)
115		return (KERNTEXTOFF);
116
117	return (nl[0].n_value);
118}
119