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|
/* $OpenBSD: i386_installboot.c,v 1.33 2019/09/02 16:36:12 otto Exp $ */
/* $NetBSD: installboot.c,v 1.5 1995/11/17 23:23:50 gwr Exp $ */
/*
* Copyright (c) 2011 Joel Sing <jsing@openbsd.org>
* Copyright (c) 2003 Tom Cosgrove <tom.cosgrove@arches-consulting.com>
* Copyright (c) 1997 Michael Shalayeff
* Copyright (c) 1994 Paul Kranenburg
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. 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.
*/
#define ELFSIZE 32
#include <sys/param.h> /* DEV_BSIZE */
#include <sys/disklabel.h>
#include <sys/dkio.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <machine/cpu.h>
#include <machine/biosvar.h>
#include <elf.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <nlist.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <uuid.h>
#include "installboot.h"
#include "i386_installboot.h"
char *bootldr;
char *blkstore;
size_t blksize;
struct sym_data pbr_symbols[] = {
{"_fs_bsize_p", 2},
{"_fs_bsize_s", 2},
{"_fsbtodb", 1},
{"_p_offset", 4},
{"_inodeblk", 4},
{"_inodedbl", 4},
{"_nblocks", 2},
{NULL}
};
static void devread(int, void *, daddr_t, size_t, char *);
static u_int findopenbsd(int, struct disklabel *);
static int getbootparams(char *, int, struct disklabel *);
static char *loadproto(char *, long *);
static int gpt_chk_mbr(struct dos_partition *, u_int64_t);
/*
* Read information about /boot's inode and filesystem parameters, then
* put biosboot (partition boot record) on the target drive with these
* parameters patched in.
*/
void
md_init(void)
{
stages = 2;
stage1 = "/usr/mdec/biosboot";
stage2 = "/usr/mdec/boot";
bootldr = "/boot";
}
void
md_loadboot(void)
{
/* Load prototype boot blocks. */
if ((blkstore = loadproto(stage1, &blksize)) == NULL)
exit(1);
/* XXX - Paranoia: Make sure size is aligned! */
if (blksize & (DEV_BSIZE - 1))
errx(1, "proto %s bad size=%ld", stage1, blksize);
if (blksize > SBSIZE - DEV_BSIZE)
errx(1, "proto bootblocks too big");
}
void
md_installboot(int devfd, char *dev)
{
struct disklabel dl;
int part;
/* Get and check disklabel. */
if (ioctl(devfd, DIOCGDINFO, &dl) == -1)
err(1, "disklabel: %s", dev);
if (dl.d_magic != DISKMAGIC)
errx(1, "bad disklabel magic=0x%08x", dl.d_magic);
/* Warn on unknown disklabel types. */
if (dl.d_type == 0)
warnx("disklabel type unknown");
part = findgptefisys(devfd, &dl);
if (part != -1) {
write_efisystem(&dl, (char)part);
return;
}
bootldr = fileprefix(root, bootldr);
if (bootldr == NULL)
exit(1);
if (verbose)
fprintf(stderr, "%s %s to %s\n",
(nowrite ? "would copy" : "copying"), stage2, bootldr);
if (!nowrite)
if (filecopy(stage2, bootldr) == -1)
exit(1);
/* Get bootstrap parameters to patch into proto. */
if (getbootparams(bootldr, devfd, &dl) != 0)
exit(1);
/* Write boot blocks to device. */
write_bootblocks(devfd, dev, &dl);
}
void
write_bootblocks(int devfd, char *dev, struct disklabel *dl)
{
struct stat sb;
u_int8_t *secbuf;
u_int start = 0;
/* Write patched proto bootblock(s) into the superblock. */
if (fstat(devfd, &sb) == -1)
err(1, "fstat: %s", dev);
if (!S_ISCHR(sb.st_mode))
errx(1, "%s: not a character device", dev);
/* Patch the parameters into the proto bootstrap sector. */
pbr_set_symbols(stage1, blkstore, pbr_symbols);
if (!nowrite) {
/* Sync filesystems (to clean in-memory superblock?). */
sync(); sleep(1);
}
/*
* Find OpenBSD partition. Floppies are special, getting an
* everything-in-one /boot starting at sector 0.
*/
if (dl->d_type != DTYPE_FLOPPY) {
start = findopenbsd(devfd, dl);
if (start == (u_int)-1)
errx(1, "no OpenBSD partition");
}
if (verbose)
fprintf(stderr, "%s will be written at sector %u\n",
stage1, start);
if (start + (blksize / dl->d_secsize) > BOOTBIOS_MAXSEC)
warnx("%s extends beyond sector %u. OpenBSD might not boot.",
stage1, BOOTBIOS_MAXSEC);
if (!nowrite) {
secbuf = calloc(1, dl->d_secsize);
if (pread(devfd, secbuf, dl->d_secsize, (off_t)start *
dl->d_secsize) != dl->d_secsize)
err(1, "pread boot sector");
bcopy(blkstore, secbuf, blksize);
if (pwrite(devfd, secbuf, dl->d_secsize, (off_t)start *
dl->d_secsize) != dl->d_secsize)
err(1, "pwrite bootstrap");
free(secbuf);
}
}
void
write_efisystem(struct disklabel *dl, char part)
{
static char *fsckfmt = "/sbin/fsck_msdos %s >/dev/null";
static char *newfsfmt ="/sbin/newfs_msdos %s >/dev/null";
struct msdosfs_args args;
char cmd[60];
char dst[PATH_MAX];
char *src;
size_t mntlen, pathlen, srclen;
int rslt;
src = NULL;
/* Create directory for temporary mount point. */
strlcpy(dst, "/tmp/installboot.XXXXXXXXXX", sizeof(dst));
if (mkdtemp(dst) == NULL)
err(1, "mkdtemp('%s') failed", dst);
mntlen = strlen(dst);
/* Mount <duid>.<part> as msdos filesystem. */
memset(&args, 0, sizeof(args));
rslt = asprintf(&args.fspec,
"%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx.%c",
dl->d_uid[0], dl->d_uid[1], dl->d_uid[2], dl->d_uid[3],
dl->d_uid[4], dl->d_uid[5], dl->d_uid[6], dl->d_uid[7],
part);
if (rslt == -1) {
warn("bad special device");
goto rmdir;
}
args.export_info.ex_root = -2; /* unchecked anyway on DOS fs */
args.export_info.ex_flags = 0;
if (mount(MOUNT_MSDOS, dst, 0, &args) == -1) {
/* Try fsck'ing it. */
rslt = snprintf(cmd, sizeof(cmd), fsckfmt, args.fspec);
if (rslt >= sizeof(cmd)) {
warnx("can't build fsck command");
rslt = -1;
goto rmdir;
}
rslt = system(cmd);
if (rslt == -1) {
warn("system('%s') failed", cmd);
goto rmdir;
}
if (mount(MOUNT_MSDOS, dst, 0, &args) == -1) {
/* Try newfs'ing it. */
rslt = snprintf(cmd, sizeof(cmd), newfsfmt,
args.fspec);
if (rslt >= sizeof(cmd)) {
warnx("can't build newfs command");
rslt = -1;
goto rmdir;
}
rslt = system(cmd);
if (rslt == -1) {
warn("system('%s') failed", cmd);
goto rmdir;
}
rslt = mount(MOUNT_MSDOS, dst, 0, &args);
if (rslt == -1) {
warn("unable to mount EFI System partition");
goto rmdir;
}
}
}
/* Create "/efi/BOOT" directory in <duid>.<part>. */
if (strlcat(dst, "/efi", sizeof(dst)) >= sizeof(dst)) {
rslt = -1;
warn("unable to build /efi directory");
goto umount;
}
rslt = mkdir(dst, 0);
if (rslt == -1 && errno != EEXIST) {
warn("mkdir('%s') failed", dst);
goto umount;
}
if (strlcat(dst, "/BOOT", sizeof(dst)) >= sizeof(dst)) {
rslt = -1;
warn("unable to build /BOOT directory");
goto umount;
}
rslt = mkdir(dst, 0);
if (rslt == -1 && errno != EEXIST) {
warn("mkdir('%s') failed", dst);
goto umount;
}
/*
* Copy BOOTIA32.EFI and BOOTX64.EFI to /efi/BOOT/.
*
* N.B.: BOOTIA32.EFI is longer than BOOTX64.EFI, so src can be reused!
*/
pathlen = strlen(dst);
if (strlcat(dst, "/BOOTIA32.EFI", sizeof(dst)) >= sizeof(dst)) {
rslt = -1;
warn("unable to build /BOOTIA32.EFI path");
goto umount;
}
src = fileprefix(root, "/usr/mdec/BOOTIA32.EFI");
if (src == NULL) {
rslt = -1;
goto umount;
}
srclen = strlen(src);
if (verbose)
fprintf(stderr, "%s %s to %s\n",
(nowrite ? "would copy" : "copying"), src, dst);
if (!nowrite) {
rslt = filecopy(src, dst);
if (rslt == -1)
goto umount;
}
src[srclen - strlen("/BOOTIA32.EFI")] = '\0';
dst[pathlen] = '\0';
if (strlcat(dst, "/BOOTX64.EFI", sizeof(dst)) >= sizeof(dst)) {
rslt = -1;
warn("unable to build /BOOTX64.EFI dst path");
goto umount;
}
if (strlcat(src, "/BOOTX64.EFI", srclen+1) >= srclen+1) {
rslt = -1;
warn("unable to build /BOOTX64.EFI src path");
goto umount;
}
if (verbose)
fprintf(stderr, "%s %s to %s\n",
(nowrite ? "would copy" : "copying"), src, dst);
if (!nowrite) {
rslt = filecopy(src, dst);
if (rslt == -1)
goto umount;
}
rslt = 0;
umount:
dst[mntlen] = '\0';
if (unmount(dst, MNT_FORCE) == -1)
err(1, "unmount('%s') failed", dst);
rmdir:
free(args.fspec);
dst[mntlen] = '\0';
if (rmdir(dst) == -1)
err(1, "rmdir('%s') failed", dst);
free(src);
if (rslt == -1)
exit(1);
}
u_int
findopenbsd(int devfd, struct disklabel *dl)
{
struct dos_mbr mbr;
u_int mbroff = DOSBBSECTOR;
u_int mbr_eoff = DOSBBSECTOR; /* Offset of extended part. */
struct dos_partition *dp;
u_int8_t *secbuf;
u_int maxebr = DOS_MAXEBR, nextebr;
int i;
again:
if (!maxebr--) {
if (verbose)
fprintf(stderr, "Traversed more than %d Extended Boot "
"Records (EBRs)\n", DOS_MAXEBR);
return ((u_int)-1);
}
if (verbose)
fprintf(stderr, "%s boot record (%cBR) at sector %u\n",
(mbroff == DOSBBSECTOR) ? "master" : "extended",
(mbroff == DOSBBSECTOR) ? 'M' : 'E', mbroff);
if ((secbuf = malloc(dl->d_secsize)) == NULL)
err(1, NULL);
if (pread(devfd, secbuf, dl->d_secsize, (off_t)mbroff * dl->d_secsize)
< (ssize_t)sizeof(mbr))
err(4, "can't pread boot record");
bcopy(secbuf, &mbr, sizeof(mbr));
free(secbuf);
if (mbr.dmbr_sign != DOSMBR_SIGNATURE)
errx(1, "invalid boot record signature (0x%04X) @ sector %u",
mbr.dmbr_sign, mbroff);
nextebr = 0;
for (i = 0; i < NDOSPART; i++) {
dp = &mbr.dmbr_parts[i];
if (!dp->dp_size)
continue;
if (verbose)
fprintf(stderr,
"\tpartition %d: type 0x%02X offset %u size %u\n",
i, dp->dp_typ, dp->dp_start, dp->dp_size);
if (dp->dp_typ == DOSPTYP_OPENBSD) {
if (dp->dp_start > (dp->dp_start + mbroff))
continue;
return (dp->dp_start + mbroff);
}
if (!nextebr && (dp->dp_typ == DOSPTYP_EXTEND ||
dp->dp_typ == DOSPTYP_EXTENDL)) {
nextebr = dp->dp_start + mbr_eoff;
if (nextebr < dp->dp_start)
nextebr = (u_int)-1;
if (mbr_eoff == DOSBBSECTOR)
mbr_eoff = dp->dp_start;
}
}
if (nextebr && nextebr != (u_int)-1) {
mbroff = nextebr;
goto again;
}
return ((u_int)-1);
}
/*
* Returns 0 if the MBR with the provided partition array is a GPT protective
* MBR, and returns 1 otherwise. A GPT protective MBR would have one and only
* one MBR partition, an EFI partition that either covers the whole disk or as
* much of it as is possible with a 32bit size field.
*
* NOTE: MS always uses a size of UINT32_MAX for the EFI partition!**
*/
static int
gpt_chk_mbr(struct dos_partition *dp, u_int64_t dsize)
{
struct dos_partition *dp2;
int efi, found, i;
u_int32_t psize;
found = efi = 0;
for (dp2=dp, i=0; i < NDOSPART; i++, dp2++) {
if (dp2->dp_typ == DOSPTYP_UNUSED)
continue;
found++;
if (dp2->dp_typ != DOSPTYP_EFI)
continue;
psize = letoh32(dp2->dp_size);
if (psize == (dsize - 1) ||
psize == UINT32_MAX) {
if (letoh32(dp2->dp_start) == 1)
efi++;
}
}
if (found == 1 && efi == 1)
return (0);
return (1);
}
int
findgptefisys(int devfd, struct disklabel *dl)
{
struct gpt_partition gp[NGPTPARTITIONS];
struct gpt_header gh;
struct dos_partition dp[NDOSPART];
struct uuid efisys_uuid;
const char efisys_uuid_code[] = GPT_UUID_EFI_SYSTEM;
off_t off;
ssize_t len;
u_int64_t start;
int i;
uint32_t orig_csum, new_csum;
uint32_t ghsize, ghpartsize, ghpartnum, ghpartspersec;
u_int8_t *secbuf;
/* Prepare EFI System UUID */
uuid_dec_be(efisys_uuid_code, &efisys_uuid);
if ((secbuf = malloc(dl->d_secsize)) == NULL)
err(1, NULL);
/* Check that there is a protective MBR. */
len = pread(devfd, secbuf, dl->d_secsize, 0);
if (len != dl->d_secsize)
err(4, "can't read mbr");
memcpy(dp, &secbuf[DOSPARTOFF], sizeof(dp));
if (gpt_chk_mbr(dp, DL_GETDSIZE(dl))) {
free(secbuf);
return (-1);
}
/* Check GPT Header. */
off = dl->d_secsize; /* Read header from sector 1. */
len = pread(devfd, secbuf, dl->d_secsize, off);
if (len != dl->d_secsize)
err(4, "can't pread gpt header");
memcpy(&gh, secbuf, sizeof(gh));
free(secbuf);
/* Check signature */
if (letoh64(gh.gh_sig) != GPTSIGNATURE)
return (-1);
if (letoh32(gh.gh_rev) != GPTREVISION)
return (-1);
ghsize = letoh32(gh.gh_size);
if (ghsize < GPTMINHDRSIZE || ghsize > sizeof(struct gpt_header))
return (-1);
/* Check checksum */
orig_csum = gh.gh_csum;
gh.gh_csum = 0;
new_csum = crc32((unsigned char *)&gh, ghsize);
gh.gh_csum = orig_csum;
if (letoh32(orig_csum) != new_csum)
return (-1);
off = letoh64(gh.gh_part_lba) * dl->d_secsize;
ghpartsize = letoh32(gh.gh_part_size);
ghpartspersec = dl->d_secsize / ghpartsize;
ghpartnum = letoh32(gh.gh_part_num);
if ((secbuf = malloc(dl->d_secsize)) == NULL)
err(1, NULL);
for (i = 0; i < (ghpartnum + ghpartspersec - 1) / ghpartspersec; i++) {
len = pread(devfd, secbuf, dl->d_secsize, off);
if (len != dl->d_secsize) {
free(secbuf);
return (-1);
}
memcpy(gp + i * ghpartspersec, secbuf,
ghpartspersec * sizeof(struct gpt_partition));
off += dl->d_secsize;
}
free(secbuf);
new_csum = crc32((unsigned char *)&gp, ghpartnum * ghpartsize);
if (new_csum != letoh32(gh.gh_part_csum))
return (-1);
start = 0;
for (i = 0; i < ghpartnum && start == 0; i++) {
if (memcmp(&gp[i].gp_type, &efisys_uuid,
sizeof(struct uuid)) == 0)
start = letoh64(gp[i].gp_lba_start);
}
if (start) {
for (i = 0; i < MAXPARTITIONS; i++) {
if (DL_GETPSIZE(&dl->d_partitions[i]) > 0 &&
DL_GETPOFFSET(&dl->d_partitions[i]) == start)
return ('a' + i);
}
}
return (-1);
}
/*
* Load the prototype boot sector (biosboot) into memory.
*/
static char *
loadproto(char *fname, long *size)
{
int fd;
size_t tdsize; /* text+data size */
char *bp;
Elf_Ehdr eh;
Elf_Word phsize;
Elf_Phdr *ph;
if ((fd = open(fname, O_RDONLY)) == -1)
err(1, "%s", fname);
if (read(fd, &eh, sizeof(eh)) != sizeof(eh))
errx(1, "%s: read failed", fname);
if (!IS_ELF(eh))
errx(1, "%s: bad magic: 0x%02x%02x%02x%02x", fname,
eh.e_ident[EI_MAG0], eh.e_ident[EI_MAG1],
eh.e_ident[EI_MAG2], eh.e_ident[EI_MAG3]);
/*
* We have to include the exec header in the beginning of
* the buffer, and leave extra space at the end in case
* the actual write to disk wants to skip the header.
*/
/* Program load header. */
if (eh.e_phnum != 1)
errx(1, "%s: %u ELF load sections (only support 1)",
fname, eh.e_phnum);
ph = reallocarray(NULL, eh.e_phnum, sizeof(Elf_Phdr));
if (ph == NULL)
err(1, NULL);
phsize = eh.e_phnum * sizeof(Elf_Phdr);
if (pread(fd, ph, phsize, eh.e_phoff) != phsize)
errx(1, "%s: can't pread header", fname);
tdsize = ph->p_filesz;
/*
* Allocate extra space here because the caller may copy
* the boot block starting at the end of the exec header.
* This prevents reading beyond the end of the buffer.
*/
if ((bp = calloc(tdsize, 1)) == NULL)
err(1, NULL);
/* Read the rest of the file. */
if (pread(fd, bp, tdsize, ph->p_offset) != (ssize_t)tdsize)
errx(1, "%s: pread failed", fname);
*size = tdsize; /* not aligned to DEV_BSIZE */
close(fd);
return bp;
}
static void
devread(int fd, void *buf, daddr_t blk, size_t size, char *msg)
{
if (pread(fd, buf, size, dbtob((off_t)blk)) != (ssize_t)size)
err(1, "%s: devread: pread", msg);
}
/*
* Read information about /boot's inode, then put this and filesystem
* parameters from the superblock into pbr_symbols.
*/
static int
getbootparams(char *boot, int devfd, struct disklabel *dl)
{
int fd;
struct stat dsb, fsb;
struct statfs fssb;
struct partition *pp;
struct fs *fs;
char *sblock, *buf;
u_int blk, *ap;
struct ufs1_dinode *ip;
int ndb;
int mib[3];
size_t size;
dev_t dev;
/*
* Open 2nd-level boot program and record enough details about
* where it is on the filesystem represented by `devfd'
* (inode block, offset within that block, and various filesystem
* parameters essentially taken from the superblock) for biosboot
* to be able to load it later.
*/
/* Make sure the (probably new) boot file is on disk. */
sync(); sleep(1);
if ((fd = open(boot, O_RDONLY)) == -1)
err(1, "open: %s", boot);
if (fstatfs(fd, &fssb) == -1)
err(1, "statfs: %s", boot);
if (strncmp(fssb.f_fstypename, "ffs", MFSNAMELEN) &&
strncmp(fssb.f_fstypename, "ufs", MFSNAMELEN) )
errx(1, "%s: not on an FFS filesystem", boot);
#if 0
if (read(fd, &eh, sizeof(eh)) != sizeof(eh))
errx(1, "read: %s", boot);
if (!IS_ELF(eh)) {
errx(1, "%s: bad magic: 0x%02x%02x%02x%02x",
boot,
eh.e_ident[EI_MAG0], eh.e_ident[EI_MAG1],
eh.e_ident[EI_MAG2], eh.e_ident[EI_MAG3]);
}
#endif
if (fsync(fd) != 0)
err(1, "fsync: %s", boot);
if (fstat(fd, &fsb) != 0)
err(1, "fstat: %s", boot);
if (fstat(devfd, &dsb) != 0)
err(1, "fstat: %d", devfd);
/* Check devices. */
mib[0] = CTL_MACHDEP;
mib[1] = CPU_CHR2BLK;
mib[2] = dsb.st_rdev;
size = sizeof(dev);
if (sysctl(mib, 3, &dev, &size, NULL, 0) >= 0) {
if (fsb.st_dev / MAXPARTITIONS != dev / MAXPARTITIONS)
errx(1, "cross-device install");
}
pp = &dl->d_partitions[DISKPART(fsb.st_dev)];
close(fd);
/* Read superblock. */
if ((sblock = malloc(SBSIZE)) == NULL)
err(1, NULL);
devread(devfd, sblock, DL_SECTOBLK(dl, pp->p_offset) + SBLOCK,
SBSIZE, "superblock");
fs = (struct fs *)sblock;
/* Sanity-check super-block. */
if (fs->fs_magic != FS_MAGIC)
errx(1, "Bad magic number in superblock");
if (fs->fs_inopb <= 0)
err(1, "Bad inopb=%d in superblock", fs->fs_inopb);
/* Read inode. */
if ((buf = malloc(fs->fs_bsize)) == NULL)
err(1, NULL);
blk = fsbtodb(fs, ino_to_fsba(fs, fsb.st_ino));
devread(devfd, buf, DL_SECTOBLK(dl, pp->p_offset) + blk,
fs->fs_bsize, "inode");
ip = (struct ufs1_dinode *)(buf) + ino_to_fsbo(fs, fsb.st_ino);
/*
* Have the inode. Figure out how many filesystem blocks (not disk
* sectors) there are for biosboot to load.
*/
ndb = howmany(ip->di_size, fs->fs_bsize);
if (ndb <= 0)
errx(1, "No blocks to load");
/*
* Now set the values that will need to go into biosboot
* (the partition boot record, a.k.a. the PBR).
*/
sym_set_value(pbr_symbols, "_fs_bsize_p", (fs->fs_bsize / 16));
sym_set_value(pbr_symbols, "_fs_bsize_s", (fs->fs_bsize /
dl->d_secsize));
/*
* fs_fsbtodb is the shift to convert fs_fsize to DEV_BSIZE. The
* ino_to_fsba() return value is the number of fs_fsize units.
* Calculate the shift to convert fs_fsize into physical sectors,
* which are added to p_offset to get the sector address BIOS
* will use.
*
* N.B.: ASSUMES fs_fsize is a power of 2 of d_secsize.
*/
sym_set_value(pbr_symbols, "_fsbtodb",
ffs(fs->fs_fsize / dl->d_secsize) - 1);
sym_set_value(pbr_symbols, "_p_offset", pp->p_offset);
sym_set_value(pbr_symbols, "_inodeblk",
ino_to_fsba(fs, fsb.st_ino));
ap = ip->di_db;
sym_set_value(pbr_symbols, "_inodedbl",
((((char *)ap) - buf) + INODEOFF));
sym_set_value(pbr_symbols, "_nblocks", ndb);
if (verbose) {
fprintf(stderr, "%s is %d blocks x %d bytes\n",
boot, ndb, fs->fs_bsize);
fprintf(stderr, "fs block shift %u; part offset %u; "
"inode block %lld, offset %u\n",
ffs(fs->fs_fsize / dl->d_secsize) - 1,
pp->p_offset,
ino_to_fsba(fs, fsb.st_ino),
(unsigned int)((((char *)ap) - buf) + INODEOFF));
}
free (sblock);
free (buf);
return 0;
}
void
sym_set_value(struct sym_data *sym_list, char *sym, u_int32_t value)
{
struct sym_data *p;
for (p = sym_list; p->sym_name != NULL; p++) {
if (strcmp(p->sym_name, sym) == 0)
break;
}
if (p->sym_name == NULL)
errx(1, "%s: no such symbol", sym);
p->sym_value = value;
p->sym_set = 1;
}
/*
* Write the parameters stored in sym_list into the in-memory copy of
* the prototype biosboot (proto), ready for it to be written to disk.
*/
void
pbr_set_symbols(char *fname, char *proto, struct sym_data *sym_list)
{
struct sym_data *sym;
struct nlist *nl;
char *vp;
u_int32_t *lp;
u_int16_t *wp;
u_int8_t *bp;
for (sym = sym_list; sym->sym_name != NULL; sym++) {
if (!sym->sym_set)
errx(1, "%s not set", sym->sym_name);
/* Allocate space for 2; second is null-terminator for list. */
nl = calloc(2, sizeof(struct nlist));
if (nl == NULL)
err(1, NULL);
nl->n_name = sym->sym_name;
if (nlist_elf32(fname, nl) != 0)
errx(1, "%s: symbol %s not found",
fname, sym->sym_name);
if (nl->n_type != (N_TEXT))
errx(1, "%s: %s: wrong type (%x)",
fname, sym->sym_name, nl->n_type);
/* Get a pointer to where the symbol's value needs to go. */
vp = proto + nl->n_value;
switch (sym->sym_size) {
case 4: /* u_int32_t */
lp = (u_int32_t *) vp;
*lp = sym->sym_value;
break;
case 2: /* u_int16_t */
if (sym->sym_value >= 0x10000) /* out of range */
errx(1, "%s: symbol out of range (%u)",
sym->sym_name, sym->sym_value);
wp = (u_int16_t *) vp;
*wp = (u_int16_t) sym->sym_value;
break;
case 1: /* u_int16_t */
if (sym->sym_value >= 0x100) /* out of range */
errx(1, "%s: symbol out of range (%u)",
sym->sym_name, sym->sym_value);
bp = (u_int8_t *) vp;
*bp = (u_int8_t) sym->sym_value;
break;
default:
errx(1, "%s: bad symbol size %d",
sym->sym_name, sym->sym_size);
/* NOTREACHED */
}
free(nl);
}
}
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