NetBSD-5.0.2/usr.sbin/mdsetimage/mdsetimage.c
/* $NetBSD: mdsetimage.c,v 1.18 2008/07/21 13:36:59 lukem Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1996\
Christopher G. Demetriou. All rights reserved.");
#endif /* not lint */
#ifndef lint
__RCSID("$NetBSD: mdsetimage.c,v 1.18 2008/07/21 13:36:59 lukem Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <limits.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "extern.h"
int main __P((int, char *[]));
static void usage __P((void)) __dead;
static int find_md_root __P((const char *, const char *, size_t,
const struct nlist *, size_t *, u_int32_t *));
static struct nlist md_root_nlist[] = {
#define X_MD_ROOT_IMAGE 0
{ "_md_root_image" },
#define X_MD_ROOT_SIZE 1
{ "_md_root_size" },
{ NULL }
};
int verbose;
#ifdef NLIST_AOUT
/*
* Since we can't get the text address from an a.out executable, we
* need to be able to specify it. Note: there's no way to test to
* see if the user entered a valid address!
*/
int T_flag_specified; /* the -T flag was specified */
u_long text_start; /* Start of kernel text */
#endif /* NLIST_AOUT */
int
main(argc, argv)
int argc;
char *argv[];
{
struct stat ksb, fssb;
size_t md_root_offset;
u_int32_t md_root_size;
const char *kfile, *fsfile;
char *mappedkfile;
int ch, kfd, fsfd, rv;
setprogname(argv[0]);
while ((ch = getopt(argc, argv, "T:v")) != -1)
switch (ch) {
case 'v':
verbose = 1;
break;
case 'T':
#ifdef NLIST_AOUT
T_flag_specified = 1;
text_start = strtoul(optarg, NULL, 0);
break;
#endif /* NLIST_AOUT */
/* FALLTHROUGH */
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
kfile = argv[0];
fsfile = argv[1];
if ((kfd = open(kfile, O_RDWR, 0)) == -1)
err(1, "open %s", kfile);
if ((rv = __fdnlist(kfd, md_root_nlist)) != 0)
errx(1, "could not find symbols in %s", kfile);
if (verbose)
fprintf(stderr, "got symbols from %s\n", kfile);
if (fstat(kfd, &ksb) == -1)
err(1, "fstat %s", kfile);
if (ksb.st_size != (size_t)ksb.st_size)
errx(1, "%s too big to map", kfile);
if ((mappedkfile = mmap(NULL, ksb.st_size, PROT_READ | PROT_WRITE,
MAP_FILE | MAP_SHARED, kfd, 0)) == (caddr_t)-1)
err(1, "mmap %s", kfile);
if (verbose)
fprintf(stderr, "mapped %s\n", kfile);
if (find_md_root(kfile, mappedkfile, ksb.st_size, md_root_nlist,
&md_root_offset, &md_root_size) != 0)
errx(1, "could not find md root buffer in %s", kfile);
if ((fsfd = open(fsfile, O_RDONLY, 0)) == -1)
err(1, "open %s", fsfile);
if (fstat(fsfd, &fssb) == -1)
err(1, "fstat %s", fsfile);
if (fssb.st_size != (size_t)fssb.st_size)
errx(1, "fs image is too big");
if (fssb.st_size > md_root_size)
errx(1, "fs image (%lld bytes) too big for buffer (%lu bytes)",
(long long)fssb.st_size, (unsigned long)md_root_size);
if (verbose)
fprintf(stderr, "copying image from %s into %s\n", fsfile,
kfile);
if ((rv = read(fsfd, mappedkfile + md_root_offset,
fssb.st_size)) != fssb.st_size) {
if (rv == -1)
err(1, "read %s", fsfile);
else
errx(1, "unexpected EOF reading %s", fsfile);
}
if (verbose)
fprintf(stderr, "done copying image\n");
close(fsfd);
munmap(mappedkfile, ksb.st_size);
close(kfd);
if (verbose)
fprintf(stderr, "exiting\n");
exit(0);
}
static void
usage()
{
fprintf(stderr,
"usage: %s kernel_file fsimage_file\n",
getprogname());
exit(1);
}
struct {
const char *name;
int (*check) __P((const char *, size_t));
int (*findoff) __P((const char *, size_t, u_long, size_t *));
} exec_formats[] = {
#ifdef NLIST_AOUT
{ "a.out", check_aout, findoff_aout, },
#endif
#ifdef NLIST_ECOFF
{ "ECOFF", check_ecoff, findoff_ecoff, },
#endif
#ifdef NLIST_ELF32
{ "ELF32", check_elf32, findoff_elf32, },
#endif
#ifdef NLIST_ELF64
{ "ELF64", check_elf64, findoff_elf64, },
#endif
#ifdef NLIST_COFF
{ "COFF", check_coff, findoff_coff, },
#endif
};
static int
find_md_root(fname, mappedfile, mappedsize, nl, rootoffp, rootsizep)
const char *fname, *mappedfile;
size_t mappedsize;
const struct nlist *nl;
size_t *rootoffp;
u_int32_t *rootsizep;
{
int i, n;
size_t rootsizeoff;
n = sizeof exec_formats / sizeof exec_formats[0];
for (i = 0; i < n; i++) {
if ((*exec_formats[i].check)(mappedfile, mappedsize) == 0)
break;
}
if (i == n) {
warnx("%s: unknown executable format", fname);
return (1);
}
if (verbose) {
fprintf(stderr, "%s is an %s binary\n", fname,
exec_formats[i].name);
#ifdef NLIST_AOUT
if (T_flag_specified)
fprintf(stderr, "kernel text loads at 0x%lx\n",
text_start);
#endif
}
if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
nl[X_MD_ROOT_SIZE].n_value, &rootsizeoff) != 0) {
warnx("couldn't find offset for %s in %s",
nl[X_MD_ROOT_SIZE].n_name, fname);
return (1);
}
if (verbose)
fprintf(stderr, "%s is at offset %#lx in %s\n",
nl[X_MD_ROOT_SIZE].n_name,
(unsigned long)rootsizeoff, fname);
*rootsizep = *(u_int32_t *)&mappedfile[rootsizeoff];
if (verbose)
fprintf(stderr, "%s has value %#x\n",
nl[X_MD_ROOT_SIZE].n_name, *rootsizep);
if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
nl[X_MD_ROOT_IMAGE].n_value, rootoffp) != 0) {
warnx("couldn't find offset for %s in %s",
nl[X_MD_ROOT_IMAGE].n_name, fname);
return (1);
}
if (verbose)
fprintf(stderr, "%s is at offset %#lx in %s\n",
nl[X_MD_ROOT_IMAGE].n_name,
(unsigned long)(*rootoffp), fname);
return (0);
}