1 /* $NetBSD: bootxx.c,v 1.2 2019/12/14 02:58:20 tsutsui 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1992, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * Ralph Campbell. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 * @(#)boot.c 8.1 (Berkeley) 6/10/93 64 */ 65 66 #include <sys/param.h> 67 #include <sys/exec_elf.h> 68 #include <lib/libsa/stand.h> 69 #include <lib/libkern/libkern.h> 70 71 typedef void (entrypt) (int, char **, int, const void *, int, char *); 72 73 entrypt main; 74 entrypt *loadfile (char *path, char *name); 75 76 /* 77 * This gets arguments from the PROM, calls other routines to open 78 * and load the secondary boot loader called boot, and then transfers 79 * execution to that program. 80 */ 81 void 82 main(int argc, char **argv, int code, const void *cv, int bim, char *bip) 83 { 84 char *cp; 85 entrypt *entry; 86 87 cp = *argv; 88 89 printf("\nNetBSD/emips " NETBSD_VERS " " BOOTXX_FS_NAME " Bootstrap\n"); 90 91 entry = loadfile(cp, "netbsd"); 92 if ((int)entry != -1) 93 goto goodload; 94 95 /* Give old /boot a go... */ 96 entry = loadfile(cp, "/boot"); 97 if ((int)entry != -1) 98 goto goodload; 99 100 goto bad; 101 goodload: 102 103 entry(argc, argv, code, cv, bim, bip); 104 bad: 105 printf("Boot failed.\n"); 106 } 107 108 /* 109 * Open 'filename', read in program and return the entry point or -1 if error. 110 */ 111 entrypt * 112 loadfile(char *path, char *name) 113 { 114 int fd, i; 115 char c, *buf, bootfname[64]; 116 Elf32_Ehdr ehdr; 117 Elf32_Phdr phdr; 118 119 strcpy(bootfname, path); 120 buf = bootfname; 121 while ((c = *buf++) != '\0') { 122 if (c == ')') 123 break; 124 if (c != '/') 125 continue; 126 while ((c = *buf++) != '\0') 127 if (c == '/') 128 break; 129 /* 130 * Make "N/rzY" with no trailing '/' valid by adding 131 * the extra '/' before appending 'bootemips' to the path. 132 */ 133 if (c != '/') { 134 buf--; 135 *buf++ = '/'; 136 *buf = '\0'; 137 } 138 break; 139 } 140 strcpy(buf, name); 141 if ((fd = open(bootfname, 0)) < 0) { 142 printf("open %s: %d\n", bootfname, errno); 143 goto err; 144 } 145 146 /* read the exec header */ 147 i = read(fd, (char *)&ehdr, sizeof(ehdr)); 148 if ((i != sizeof(ehdr)) || 149 (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) || 150 (ehdr.e_ident[EI_CLASS] != ELFCLASS32)) { 151 printf("%s: No ELF header\n", bootfname); 152 goto cerr; 153 } 154 155 for (i = 0; i < ehdr.e_phnum; i++) { 156 if (lseek(fd, (off_t) ehdr.e_phoff + i * sizeof(phdr), 0) < 0) 157 goto cerr; 158 if (read(fd, &phdr, sizeof(phdr)) != sizeof(phdr)) 159 goto cerr; 160 if (phdr.p_type != PT_LOAD) 161 continue; 162 if (lseek(fd, (off_t)phdr.p_offset, 0) < 0) 163 goto cerr; 164 if (read(fd, (char *)phdr.p_paddr, phdr.p_filesz) != phdr.p_filesz) 165 goto cerr; 166 } 167 return ((entrypt*)ehdr.e_entry); 168 169 cerr: 170 #ifndef LIBSA_NO_FS_CLOSE 171 (void) close(fd); 172 #endif 173 err: 174 printf("Can't load '%s'\n", bootfname); 175 return ((entrypt*)-1); 176 } 177
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