Home | History | Annotate | Line # | Download | only in common
bootxx.c revision 1.1.4.2 
      1 /*	$NetBSD: bootxx.c,v 1.1.4.2 2011/03/05 20:50:01 rmind Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jonathan Stone, Michael Hitch and Simon Burge.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Copyright (c) 1992, 1993
     41  *	The Regents of the University of California.  All rights reserved.
     42  *
     43  * This code is derived from software contributed to Berkeley by
     44  * Ralph Campbell.
     45  *
     46  * Redistribution and use in source and binary forms, with or without
     47  * modification, are permitted provided that the following conditions
     48  * are met:
     49  * 1. Redistributions of source code must retain the above copyright
     50  *    notice, this list of conditions and the following disclaimer.
     51  * 2. Redistributions in binary form must reproduce the above copyright
     52  *    notice, this list of conditions and the following disclaimer in the
     53  *    documentation and/or other materials provided with the distribution.
     54  * 3. Neither the name of the University nor the names of its contributors
     55  *    may be used to endorse or promote products derived from this software
     56  *    without specific prior written permission.
     57  *
     58  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     68  * SUCH DAMAGE.
     69  *
     70  *	@(#)boot.c	8.1 (Berkeley) 6/10/93
     71  */
     72 
     73 #include <sys/param.h>
     74 #include <sys/exec_elf.h>
     75 #include <lib/libsa/stand.h>
     76 #include <lib/libkern/libkern.h>
     77 
     78 typedef void (entrypt) (int, char **, int, const void *, int, char *);
     79 
     80 entrypt main;
     81 entrypt *loadfile (char *path, char *name);
     82 
     83 /*
     84  * This gets arguments from the PROM, calls other routines to open
     85  * and load the secondary boot loader called boot, and then transfers
     86  * execution to that program.
     87  */
     88 void
     89 main(int argc, char **argv, int code, const void *cv, int bim, char *bip)
     90 {
     91 	char *cp;
     92 	entrypt *entry;
     93 
     94 	cp = *argv;
     95 
     96     printf("\nNetBSD/emips " NETBSD_VERS " " BOOTXX_FS_NAME " Bootstrap\n");
     97 
     98 	entry = loadfile(cp, "netbsd");
     99 	if ((int)entry != -1)
    100 		goto goodload;
    101 
    102 	/* Give old /boot a go... */
    103 	entry = loadfile(cp, "/boot");
    104 	if ((int)entry != -1)
    105 		goto goodload;
    106 
    107 	goto bad;
    108 goodload:
    109 
    110     entry(argc, argv, code, cv, bim, bip);
    111 bad:
    112     printf("Boot failed.\n");
    113 }
    114 
    115 /*
    116  * Open 'filename', read in program and return the entry point or -1 if error.
    117  */
    118 entrypt *
    119 loadfile(char *path, char *name)
    120 {
    121 	int fd, i;
    122 	char c, *buf, bootfname[64];
    123 	Elf32_Ehdr ehdr;
    124 	Elf32_Phdr phdr;
    125 
    126 	strcpy(bootfname, path);
    127 	buf = bootfname;
    128 	while ((c = *buf++) != '\0') {
    129 		if (c == ')')
    130 			break;
    131 		if (c != '/')
    132 			continue;
    133 		while ((c = *buf++) != '\0')
    134 			if (c == '/')
    135 				break;
    136 		/*
    137 		 * Make "N/rzY" with no trailing '/' valid by adding
    138 		 * the extra '/' before appending 'bootemips' to the path.
    139 		 */
    140 		if (c != '/') {
    141 			buf--;
    142 			*buf++ = '/';
    143 			*buf = '\0';
    144 		}
    145 		break;
    146 	}
    147 	strcpy(buf, name);
    148 	if ((fd = open(bootfname, 0)) < 0) {
    149 		printf("open %s: %d\n", bootfname, errno);
    150 		goto err;
    151 	}
    152 
    153 	/* read the exec header */
    154 	i = read(fd, (char *)&ehdr, sizeof(ehdr));
    155 	if ((i != sizeof(ehdr)) ||
    156 	    (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) ||
    157 	    (ehdr.e_ident[EI_CLASS] != ELFCLASS32)) {
    158 		printf("%s: No ELF header\n", bootfname);
    159 		goto cerr;
    160 	}
    161 
    162 	for (i = 0; i < ehdr.e_phnum; i++) {
    163 		if (lseek(fd, (off_t) ehdr.e_phoff + i * sizeof(phdr), 0) < 0)
    164 			goto cerr;
    165 		if (read(fd, &phdr, sizeof(phdr)) != sizeof(phdr))
    166 			goto cerr;
    167 		if (phdr.p_type != PT_LOAD)
    168 			continue;
    169 		if (lseek(fd, (off_t)phdr.p_offset, 0) < 0)
    170 			goto cerr;
    171 		if (read(fd, (char *)phdr.p_paddr, phdr.p_filesz) != phdr.p_filesz)
    172 			goto cerr;
    173 	}
    174 	return ((entrypt*)ehdr.e_entry);
    175 
    176 cerr:
    177 #ifndef LIBSA_NO_FS_CLOSE
    178 	(void) close(fd);
    179 #endif
    180 err:
    181 	printf("Can't load '%s'\n", bootfname);
    182 	return ((entrypt*)-1);
    183 }
    184