sys/arch/prep/stand/installboot/installboot.c

   1 /*      $NetBSD: installboot.c,v 1.7 2005/12/11 12:18:51 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 2000 NONAKA Kimihiro (nonaka@NetBSD.org).
   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
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/exec_elf.h>
  32 #include <sys/bootblock.h>
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37 #include <fcntl.h>
  38 #include <err.h>
  39 #include <string.h>
  40
  41 int nowrite, verbose;
  42 char *boot, *dev;
  43
  44 void usage(void);
  45 int devread(int, void *, daddr_t, size_t, char *);
  46 char *load_boot(char *, size_t *);
  47 int load_prep_partition(int, struct mbr_partition *);
  48 int main(int, char **);
  49
  50 void
  51 usage(void)
  52 {
  53
  54         fprintf(stderr, "usage: %s [-n] [-v] <boot> <device>\n",
  55             getprogname());
  56         exit(1);
  57 }
  58
  59 int
  60 devread(int fd, void *buf, daddr_t blk, size_t size, char *msg)
  61 {
  62
  63         if (lseek(fd, (off_t)dbtob(blk), SEEK_SET) != dbtob(blk)) {
  64                 warn("%s: devread: lseek", msg);
  65                 return 1;
  66         }
  67         if (read(fd, buf, size) != size) {
  68                 warn("%s: devread: read", msg);
  69                 return 1;
  70         }
  71         return 0;
  72 }
  73
  74 char *
  75 load_boot(char *boot, size_t *bootsize)
  76 {
  77         Elf32_Ehdr eh;
  78         Elf32_Phdr ph;
  79         struct stat st;
  80         int fd;
  81         int i;
  82         size_t imgsz = 0;
  83         char *bp = NULL;
  84
  85         if ((fd = open(boot, O_RDONLY)) < 0) {
  86                 warn("open: %s", boot);
  87                 return NULL;
  88         }
  89
  90         if (fstat(fd, &st) != 0) {
  91                 warn("fstat: %s", boot);
  92                 goto out;
  93         }
  94
  95         /*
  96          * First, check ELF.
  97          */
  98         if (read(fd, &eh, sizeof(eh)) != sizeof(eh)) {
  99                 warn("read: eh: %s", boot);
 100                 goto out;
 101         }
 102         if (memcmp(eh.e_ident, ELFMAG, SELFMAG) != 0 ||
 103             eh.e_ident[EI_CLASS] != ELFCLASS32) {
 104                 lseek(fd, 0L, SEEK_SET);
 105                 goto notelf;
 106         }
 107         if (be16toh(eh.e_machine) != EM_PPC) {
 108                 warn("not PowerPC binary.");
 109                 goto out;
 110         }
 111
 112         for (i = 0; i < be16toh(eh.e_phnum); i++) {
 113                 (void)lseek(fd, be32toh(eh.e_phoff) + sizeof(ph) * i, SEEK_SET);
 114                 if (read(fd, &ph, sizeof(ph)) != sizeof(ph)) {
 115                         warn("read: ph: %s", boot);
 116                         goto out;
 117                 }
 118
 119                 if ((be32toh(ph.p_type) != PT_LOAD) ||
 120                     !(be32toh(ph.p_flags) & PF_X))
 121                         continue;
 122
 123                 imgsz = st.st_size - be32toh(ph.p_offset);
 124                 lseek(fd, be32toh(ph.p_offset), SEEK_SET);
 125                 break;
 126         }
 127
 128 notelf:
 129         /*
 130          * Second, check PReP bootable image.
 131          */
 132         if (imgsz == 0) {
 133                 char buf[DEV_BSIZE];
 134
 135                 printf("Bootable image: ");
 136                 if (load_prep_partition(fd, 0)) {
 137                         warn("no PReP bootable image.");
 138                         goto out;
 139                 }
 140
 141                 if (lseek(fd, (off_t)dbtob(1), SEEK_SET) != dbtob(1)) {
 142                         warn("bootable image lseek sector 1");
 143                         goto out;
 144                 }
 145                 if (read(fd, buf, DEV_BSIZE) != DEV_BSIZE) {
 146                         warn("read: start/size");
 147                         goto out;
 148                 }
 149
 150                 imgsz = le32toh(*(u_int32_t *)(buf + sizeof(u_int32_t)))
 151                     - dbtob(2);
 152                 lseek(fd, le32toh(*(u_int32_t *)buf), SEEK_SET);
 153         }
 154
 155         if ((bp = (char *)calloc(roundup(imgsz, DEV_BSIZE), 1)) == NULL) {
 156                 warn("calloc: no memory for boot image.");
 157                 goto out;
 158         }
 159
 160         if (read(fd, bp, imgsz) != imgsz) {
 161                 warn("read: boot image: %s", boot);
 162                 goto out;
 163         }
 164
 165         if (verbose) {
 166                 printf("image size = %d\n", imgsz);
 167         }
 168
 169         *bootsize = roundup(imgsz, DEV_BSIZE);
 170
 171         close(fd);
 172         return bp;
 173
 174 out:
 175         if (bp != NULL)
 176                 free(bp);
 177         if (fd >= 0)
 178                 close(fd);
 179         return NULL;
 180 }
 181
 182 int
 183 load_prep_partition(int devfd, struct mbr_partition *ppp)
 184 {
 185         char mbr[512];
 186         struct mbr_partition *mbrp;
 187         int i;
 188
 189         if (devread(devfd, mbr, MBR_BBSECTOR, DEV_BSIZE, "MBR") != 0)
 190                 return 1;
 191         if (*(u_int16_t *)&mbr[MBR_MAGIC_OFFSET] != htole16(MBR_MAGIC)) {
 192                 warn("no MBR_MAGIC");
 193                 return 1;
 194         }
 195
 196         mbrp = (struct mbr_partition *)&mbr[MBR_PART_OFFSET];
 197         for (i = 0; i < MBR_PART_COUNT; i++) {
 198                 if (mbrp[i].mbrp_type == MBR_PTYPE_PREP)
 199                         break;
 200         }
 201         if (i == MBR_PART_COUNT) {
 202                 warn("no PReP partition.");
 203                 return 1;
 204         }
 205
 206         if (verbose) {
 207                 printf("PReP partition: start = %d, size = %d\n",
 208                     le32toh(mbrp[i].mbrp_start), le32toh(mbrp[i].mbrp_size));
 209         }
 210
 211         if (ppp) {
 212                 *ppp = mbrp[i];
 213                 ppp->mbrp_start = le32toh(ppp->mbrp_start);
 214                 ppp->mbrp_size = le32toh(ppp->mbrp_size);
 215         }
 216
 217         return 0;
 218 }
 219
 220 int
 221 main(int argc, char **argv)
 222 {
 223         struct mbr_partition ppp;
 224         size_t bootsize;
 225         int c;
 226         int boot00[512/sizeof(int)];
 227         int devfd = -1;
 228         char *bp;
 229
 230         while ((c = getopt(argc, argv, "vn")) != EOF) {
 231                 switch (c) {
 232                 case 'n':
 233                         nowrite = 1;
 234                         break;
 235                 case 'v':
 236                         verbose = 1;
 237                         break;
 238                 default:
 239                         usage();
 240                         break;
 241                 }
 242         }
 243
 244         if (argc - optind < 2)
 245                 usage();
 246
 247         boot = argv[optind];
 248         dev = argv[optind + 1];
 249         if (verbose) {
 250                 printf("boot: %s\n", boot);
 251                 printf("dev: %s\n", dev);
 252         }
 253
 254         if ((bp = load_boot(boot, &bootsize)) == NULL)
 255                 return 1;
 256
 257         if ((devfd = open(dev, O_RDONLY, 0)) < 0) {
 258                 warn("open: %s", dev);
 259                 goto out;
 260         }
 261
 262         if (load_prep_partition(devfd, &ppp)) {
 263                 warn("load_prep_partition");
 264                 goto out;
 265         }
 266
 267         if (bootsize + dbtob(2) > dbtob(ppp.mbrp_size)) {
 268                 warn("boot image is too big.");
 269                 goto out;
 270         }
 271
 272         close(devfd);
 273
 274         if (nowrite) {
 275                 free(bp);
 276                 return 0;
 277         }
 278
 279         if ((devfd = open(dev, O_RDWR, 0)) < 0) {
 280                 warn("open: %s", dev);
 281                 goto out;
 282         }
 283
 284         /*
 285          * Write boot image.
 286          */
 287         memset(boot00, 0, sizeof(boot00));
 288         (void)lseek(devfd, (off_t)dbtob(ppp.mbrp_start), SEEK_SET);
 289         if (write(devfd, boot00, sizeof(boot00)) != sizeof(boot00)) {
 290                 warn("write boot00(prep mbr)");
 291                 goto out;
 292         }
 293
 294         (void)lseek(devfd, (off_t)dbtob(ppp.mbrp_start+1), SEEK_SET);
 295         boot00[0] = htole32(dbtob(2));
 296         boot00[1] = htole32(bootsize);
 297         if (write(devfd, boot00, sizeof(boot00)) != sizeof(boot00)) {
 298                 warn("write boot00(prep start/size)");
 299                 goto out;
 300         }
 301
 302         if (devread(devfd, boot00, 1, DEV_BSIZE, "start/size") != 0)
 303                 goto out;
 304         boot00[0] = htole32(dbtob(ppp.mbrp_start));
 305         boot00[1] = htole32(bootsize + dbtob(2));
 306         (void)lseek(devfd, (off_t)dbtob(1), SEEK_SET);
 307         if (write(devfd, boot00, sizeof(boot00)) != sizeof(boot00)) {
 308                 warn("write boot00(master start/size)");
 309                 goto out;
 310         }
 311
 312         (void)lseek(devfd, (off_t)dbtob(ppp.mbrp_start+2), SEEK_SET);
 313         if (write(devfd, bp, bootsize) != bootsize) {
 314                 warn("write boot loader");
 315                 goto out;
 316         }
 317
 318         close(devfd);
 319         free(bp);
 320         return 0;
 321
 322 out:
 323         if (devfd >= 0)
 324                 close(devfd);
 325         if (bp != NULL)
 326                 free(bp);
 327         return 1;
 328 }