267 lines
7.0 KiB
C
267 lines
7.0 KiB
C
/* $NetBSD: mdsetimage.c,v 1.16 2001/10/01 23:32:34 cgd Exp $ */
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/*
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* Copyright (c) 1996 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT(
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"@(#) Copyright (c) 1996 Christopher G. Demetriou.\
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All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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__RCSID("$NetBSD: mdsetimage.c,v 1.16 2001/10/01 23:32:34 cgd Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "extern.h"
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int main __P((int, char *[]));
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static void usage __P((void)) __attribute__((noreturn));
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static int find_md_root __P((const char *, const char *, size_t,
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const struct nlist *, size_t *, u_int32_t *));
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static struct nlist md_root_nlist[] = {
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#define X_MD_ROOT_IMAGE 0
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{ "_md_root_image" },
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#define X_MD_ROOT_SIZE 1
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{ "_md_root_size" },
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{ NULL }
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};
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int verbose;
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#ifdef NLIST_AOUT
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/*
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* Since we can't get the text address from an a.out executable, we
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* need to be able to specify it. Note: there's no way to test to
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* see if the user entered a valid address!
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*/
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int T_flag_specified; /* the -T flag was specified */
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u_long text_start; /* Start of kernel text */
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#endif /* NLIST_AOUT */
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct stat ksb, fssb;
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size_t md_root_offset;
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u_int32_t md_root_size;
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const char *kfile, *fsfile;
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char *mappedkfile;
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int ch, kfd, fsfd, rv;
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setprogname(argv[0]);
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while ((ch = getopt(argc, argv, "T:v")) != -1)
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switch (ch) {
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case 'v':
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verbose = 1;
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break;
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case 'T':
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#ifdef NLIST_AOUT
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T_flag_specified = 1;
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text_start = strtoul(optarg, NULL, 0);
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break;
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#endif /* NLIST_AOUT */
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/* FALLTHROUGH */
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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kfile = argv[0];
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fsfile = argv[1];
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if ((kfd = open(kfile, O_RDWR, 0)) == -1)
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err(1, "open %s", kfile);
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if ((rv = __fdnlist(kfd, md_root_nlist)) != 0)
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errx(1, "could not find symbols in %s", kfile);
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if (verbose)
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fprintf(stderr, "got symbols from %s\n", kfile);
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if (fstat(kfd, &ksb) == -1)
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err(1, "fstat %s", kfile);
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if (ksb.st_size != (size_t)ksb.st_size)
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errx(1, "%s too big to map", kfile);
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if ((mappedkfile = mmap(NULL, ksb.st_size, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, kfd, 0)) == (caddr_t)-1)
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err(1, "mmap %s", kfile);
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if (verbose)
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fprintf(stderr, "mapped %s\n", kfile);
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if (find_md_root(kfile, mappedkfile, ksb.st_size, md_root_nlist,
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&md_root_offset, &md_root_size) != 0)
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errx(1, "could not find md root buffer in %s", kfile);
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if ((fsfd = open(fsfile, O_RDONLY, 0)) == -1)
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err(1, "open %s", fsfile);
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if (fstat(fsfd, &fssb) == -1)
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err(1, "fstat %s", fsfile);
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if (fssb.st_size != (size_t)fssb.st_size)
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errx(1, "fs image is too big");
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if (fssb.st_size > md_root_size)
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errx(1, "fs image (%lld bytes) too big for buffer (%lu bytes)",
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(long long)fssb.st_size, (unsigned long)md_root_size);
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if (verbose)
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fprintf(stderr, "copying image from %s into %s\n", fsfile,
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kfile);
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if ((rv = read(fsfd, mappedkfile + md_root_offset,
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fssb.st_size)) != fssb.st_size) {
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if (rv == -1)
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err(1, "read %s", fsfile);
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else
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errx(1, "unexpected EOF reading %s", fsfile);
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}
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if (verbose)
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fprintf(stderr, "done copying image\n");
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close(fsfd);
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munmap(mappedkfile, ksb.st_size);
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close(kfd);
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if (verbose)
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fprintf(stderr, "exiting\n");
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exit(0);
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}
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static void
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usage()
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{
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fprintf(stderr,
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"usage: %s kernel_file fsimage_file\n",
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getprogname());
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exit(1);
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}
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struct {
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const char *name;
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int (*check) __P((const char *, size_t));
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int (*findoff) __P((const char *, size_t, u_long, size_t *));
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} exec_formats[] = {
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#ifdef NLIST_AOUT
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{ "a.out", check_aout, findoff_aout, },
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#endif
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#ifdef NLIST_ECOFF
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{ "ECOFF", check_ecoff, findoff_ecoff, },
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#endif
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#ifdef NLIST_ELF32
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{ "ELF32", check_elf32, findoff_elf32, },
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#endif
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#ifdef NLIST_ELF64
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{ "ELF64", check_elf64, findoff_elf64, },
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#endif
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#ifdef NLIST_COFF
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{ "COFF", check_coff, findoff_coff, },
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#endif
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};
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static int
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find_md_root(fname, mappedfile, mappedsize, nl, rootoffp, rootsizep)
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const char *fname, *mappedfile;
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size_t mappedsize;
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const struct nlist *nl;
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size_t *rootoffp;
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u_int32_t *rootsizep;
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{
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int i, n;
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size_t rootsizeoff;
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n = sizeof exec_formats / sizeof exec_formats[0];
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for (i = 0; i < n; i++) {
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if ((*exec_formats[i].check)(mappedfile, mappedsize) == 0)
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break;
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}
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if (i == n) {
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warnx("%s: unknown executable format", fname);
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return (1);
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}
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if (verbose) {
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fprintf(stderr, "%s is an %s binary\n", fname,
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exec_formats[i].name);
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#ifdef NLIST_AOUT
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if (T_flag_specified)
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fprintf(stderr, "kernel text loads at 0x%lx\n",
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text_start);
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#endif
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}
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if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
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nl[X_MD_ROOT_SIZE].n_value, &rootsizeoff) != 0) {
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warnx("couldn't find offset for %s in %s",
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nl[X_MD_ROOT_SIZE].n_name, fname);
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return (1);
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}
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if (verbose)
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fprintf(stderr, "%s is at offset %#lx in %s\n",
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nl[X_MD_ROOT_SIZE].n_name,
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(unsigned long)rootsizeoff, fname);
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*rootsizep = *(u_int32_t *)&mappedfile[rootsizeoff];
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if (verbose)
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fprintf(stderr, "%s has value %#x\n",
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nl[X_MD_ROOT_SIZE].n_name, *rootsizep);
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if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
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nl[X_MD_ROOT_IMAGE].n_value, rootoffp) != 0) {
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warnx("couldn't find offset for %s in %s",
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nl[X_MD_ROOT_IMAGE].n_name, fname);
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return (1);
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}
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if (verbose)
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fprintf(stderr, "%s is at offset %#lx in %s\n",
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nl[X_MD_ROOT_IMAGE].n_name,
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(unsigned long)(*rootoffp), fname);
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return (0);
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}
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