1/* $NetBSD$ */
2
3/*
4 * Copyright (c) 1996 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1996\
35 Christopher G. Demetriou.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39__RCSID("$NetBSD$");
40#endif /* not lint */
41
42#include <sys/types.h>
43#include <sys/mman.h>
44#include <sys/stat.h>
45
46#include <err.h>
47#include <fcntl.h>
48#include <limits.h>
49#include <nlist.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54
55#include "extern.h"
56
57int		main __P((int, char *[]));
58static void	usage __P((void)) __dead;
59static int	find_md_root __P((const char *, const char *, size_t,
60		    const struct nlist *, size_t *, u_int32_t *));
61
62#define	X_MD_ROOT_IMAGE		0
63#define	X_MD_ROOT_SIZE		1
64
65int	verbose;
66#ifdef NLIST_AOUT
67/*
68 * Since we can't get the text address from an a.out executable, we
69 * need to be able to specify it.  Note: there's no way to test to
70 * see if the user entered a valid address!
71 */
72int	T_flag_specified;	/* the -T flag was specified */
73u_long	text_start;		/* Start of kernel text */
74#endif /* NLIST_AOUT */
75
76int
77main(argc, argv)
78	int argc;
79	char *argv[];
80{
81	struct stat ksb, fssb;
82	size_t md_root_offset;
83	u_int32_t md_root_size;
84	const char *kfile, *fsfile;
85	char *mappedkfile;
86	int ch, kfd, fsfd, rv;
87	struct nlist md_root_nlist[3];
88
89	(void)memset(md_root_nlist, 0, sizeof(md_root_nlist));
90	N_NAME(&md_root_nlist[X_MD_ROOT_IMAGE]) = "_md_root_image";
91	N_NAME(&md_root_nlist[X_MD_ROOT_SIZE]) = "_md_root_size";
92
93	setprogname(argv[0]);
94
95	while ((ch = getopt(argc, argv, "I:S:T:v")) != -1)
96		switch (ch) {
97		case 'v':
98			verbose = 1;
99			break;
100		case 'I':
101			N_NAME(&md_root_nlist[X_MD_ROOT_IMAGE]) = optarg;
102			break;
103		case 'S':
104			N_NAME(&md_root_nlist[X_MD_ROOT_SIZE]) = optarg;
105			break;
106		case 'T':
107#ifdef NLIST_AOUT
108			T_flag_specified = 1;
109			text_start = strtoul(optarg, NULL, 0);
110			break;
111#endif /* NLIST_AOUT */
112			/* FALLTHROUGH */
113		case '?':
114		default:
115			usage();
116	}
117	argc -= optind;
118	argv += optind;
119
120	if (argc != 2)
121		usage();
122	kfile = argv[0];
123	fsfile = argv[1];
124
125	if ((kfd = open(kfile, O_RDWR, 0))  == -1)
126		err(1, "open %s", kfile);
127
128	if ((rv = __fdnlist(kfd, md_root_nlist)) != 0)
129		errx(1, "could not find symbols in %s", kfile);
130	if (verbose)
131		fprintf(stderr, "got symbols from %s\n", kfile);
132
133	if (fstat(kfd, &ksb) == -1)
134		err(1, "fstat %s", kfile);
135	if (ksb.st_size != (size_t)ksb.st_size)
136		errx(1, "%s too big to map", kfile);
137
138	if ((mappedkfile = mmap(NULL, ksb.st_size, PROT_READ | PROT_WRITE,
139	    MAP_FILE | MAP_SHARED, kfd, 0)) == (caddr_t)-1)
140		err(1, "mmap %s", kfile);
141	if (verbose)
142		fprintf(stderr, "mapped %s\n", kfile);
143
144	if (find_md_root(kfile, mappedkfile, ksb.st_size, md_root_nlist,
145	    &md_root_offset, &md_root_size) != 0)
146		errx(1, "could not find md root buffer in %s", kfile);
147
148	if ((fsfd = open(fsfile, O_RDONLY, 0)) == -1)
149		err(1, "open %s", fsfile);
150	if (fstat(fsfd, &fssb) == -1)
151		err(1, "fstat %s", fsfile);
152	if (fssb.st_size != (size_t)fssb.st_size)
153		errx(1, "fs image is too big");
154	if (fssb.st_size > md_root_size)
155		errx(1, "fs image (%lld bytes) too big for buffer (%lu bytes)",
156		    (long long)fssb.st_size, (unsigned long)md_root_size);
157
158	if (verbose)
159		fprintf(stderr, "copying image from %s into %s\n", fsfile,
160		    kfile);
161	if ((rv = read(fsfd, mappedkfile + md_root_offset,
162	    fssb.st_size)) != fssb.st_size) {
163		if (rv == -1)
164			err(1, "read %s", fsfile);
165		else
166			errx(1, "unexpected EOF reading %s", fsfile);
167	}
168	if (verbose)
169		fprintf(stderr, "done copying image\n");
170
171	close(fsfd);
172
173	munmap(mappedkfile, ksb.st_size);
174	close(kfd);
175
176	if (verbose)
177		fprintf(stderr, "exiting\n");
178	exit(0);
179}
180
181static void
182usage()
183{
184
185	fprintf(stderr,
186	    "usage: %s kernel_file fsimage_file\n",
187	    getprogname());
188	exit(1);
189}
190
191
192struct {
193	const char *name;
194	int	(*check) __P((const char *, size_t));
195	int	(*findoff) __P((const char *, size_t, u_long, size_t *));
196} exec_formats[] = {
197#ifdef NLIST_AOUT
198	{	"a.out",	check_aout,	findoff_aout,	},
199#endif
200#ifdef NLIST_ECOFF
201	{	"ECOFF",	check_ecoff,	findoff_ecoff,	},
202#endif
203#ifdef NLIST_ELF32
204	{	"ELF32",	check_elf32,	findoff_elf32,	},
205#endif
206#ifdef NLIST_ELF64
207	{	"ELF64",	check_elf64,	findoff_elf64,	},
208#endif
209#ifdef NLIST_COFF
210	{	"COFF",		check_coff,	findoff_coff,	},
211#endif
212};
213
214static int
215find_md_root(fname, mappedfile, mappedsize, nl, rootoffp, rootsizep)
216	const char *fname, *mappedfile;
217	size_t mappedsize;
218	const struct nlist *nl;
219	size_t *rootoffp;
220	u_int32_t *rootsizep;
221{
222	int i, n;
223	size_t rootsizeoff;
224
225	n = sizeof exec_formats / sizeof exec_formats[0];
226	for (i = 0; i < n; i++) {
227		if ((*exec_formats[i].check)(mappedfile, mappedsize) == 0)
228			break;
229	}
230	if (i == n) {
231		warnx("%s: unknown executable format", fname);
232		return (1);
233	}
234
235	if (verbose) {
236		fprintf(stderr, "%s is an %s binary\n", fname,
237		    exec_formats[i].name);
238#ifdef NLIST_AOUT
239		if (T_flag_specified)
240			fprintf(stderr, "kernel text loads at 0x%lx\n",
241			    text_start);
242#endif
243	}
244
245	if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
246	    nl[X_MD_ROOT_SIZE].n_value, &rootsizeoff) != 0) {
247		warnx("couldn't find offset for %s in %s",
248		    nl[X_MD_ROOT_SIZE].n_name, fname);
249		return (1);
250	}
251	if (verbose)
252		fprintf(stderr, "%s is at offset %#lx in %s\n",
253			nl[X_MD_ROOT_SIZE].n_name,
254			(unsigned long)rootsizeoff, fname);
255	*rootsizep = *(const u_int32_t *)&mappedfile[rootsizeoff];
256	if (verbose)
257		fprintf(stderr, "%s has value %#x\n",
258		    nl[X_MD_ROOT_SIZE].n_name, *rootsizep);
259
260	if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
261	    nl[X_MD_ROOT_IMAGE].n_value, rootoffp) != 0) {
262		warnx("couldn't find offset for %s in %s",
263		    nl[X_MD_ROOT_IMAGE].n_name, fname);
264		return (1);
265	}
266	if (verbose)
267		fprintf(stderr, "%s is at offset %#lx in %s\n",
268			nl[X_MD_ROOT_IMAGE].n_name,
269			(unsigned long)(*rootoffp), fname);
270
271	return (0);
272}
273