exec_mvme.c revision 1.9
1 /* $NetBSD: exec_mvme.c,v 1.9 2000/07/24 18:39:46 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1990, 1993 5 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)boot.c 8.1 (Berkeley) 6/10/93 36 */ 37 38 #include <sys/param.h> 39 #include <sys/reboot.h> 40 #include <machine/prom.h> 41 #include <sys/exec_aout.h> 42 43 #include "stand.h" 44 #include "libsa.h" 45 46 /* This must agree with what locore.s expects */ 47 typedef void (*kentry_t)(int, u_int, u_int, u_int, int, char *); 48 49 50 /*ARGSUSED*/ 51 void 52 exec_mvme(file, flag, part) 53 char *file; 54 int flag; 55 int part; 56 { 57 char *loadaddr; 58 int io; 59 struct exec x; 60 int cc, magic; 61 kentry_t *entry; 62 char *cp; 63 int *ip; 64 65 #ifdef DEBUG 66 printf("exec_mvme: partition=%d, file=%s flag=0x%x\n", part, file, flag); 67 #endif 68 69 io = open(file, 0); 70 if (io < 0) 71 return; 72 73 /* 74 * Read in the exec header, and validate it. 75 */ 76 if (read(io, (void *)&x, sizeof(x)) != sizeof(x)) 77 goto shread; 78 if (N_BADMAG(x)) { 79 errno = EFTYPE; 80 goto closeout; 81 } 82 83 /* 84 * note: on the mvme ports, the kernel is linked in such a way that 85 * its entry point is the first item in .text, and thus a_entry can 86 * be used to determine both the load address and the entry point. 87 * (also note that we make use of the fact that the kernel will live 88 * in a VA == PA range of memory ... otherwise we would take 89 * loadaddr as a parameter and let the kernel relocate itself!) 90 * 91 * note that ZMAGIC files included the a.out header in the text area 92 * so we must mask that off (has no effect on the other formats 93 */ 94 loadaddr = (void *)(x.a_entry & ~sizeof(x)); 95 96 cp = loadaddr; 97 magic = (int)N_GETMAGIC(x); 98 if (magic == ZMAGIC) 99 cp += sizeof(x); 100 /*LINTED*/ 101 entry = (kentry_t *) cp; 102 103 /* 104 * Leave a copy of the exec header before the text. 105 * The sun3 kernel uses this to verify that the 106 * symbols were loaded by this boot program. 107 */ 108 bcopy(&x, cp - sizeof(x), sizeof(x)); 109 110 /* 111 * Read in the text segment. 112 */ 113 printf("%ld", x.a_text); 114 cc = (int)x.a_text; 115 if (magic == ZMAGIC) 116 cc = cc - sizeof(x); /* a.out header part of text in zmagic */ 117 if (read(io, cp, (size_t)cc) != (size_t)cc) 118 goto shread; 119 cp += cc; 120 121 /* 122 * NMAGIC may have a gap between text and data. 123 */ 124 if (magic == NMAGIC) { 125 int mask = N_PAGSIZ(x) - 1; 126 /*LINTED*/ 127 while ((int)cp & mask) 128 *cp++ = 0; 129 } 130 131 /* 132 * Read in the data segment. 133 */ 134 printf("+%ld", x.a_data); 135 if (read(io, cp, (size_t)x.a_data) != (size_t)x.a_data) 136 goto shread; 137 cp += (int)x.a_data; 138 139 /* 140 * Zero out the BSS section. 141 * (Kernel doesn't care, but do it anyway.) 142 */ 143 printf("+%ld", x.a_bss); 144 cc = (int)x.a_bss; 145 /*LINTED*/ 146 while ((int)cp & 3) { 147 *cp++ = 0; 148 --cc; 149 } 150 /*LINTED*/ 151 ip = (int*)cp; 152 cp += cc; 153 /*LINTED*/ 154 while ((char*)ip < cp) 155 *ip++ = 0; 156 157 /* 158 * Read in the symbol table and strings. 159 * (Always set the symtab size word.) 160 */ 161 *ip++ = (int)x.a_syms; 162 /*LINTED*/ 163 cp = (char*) ip; 164 165 if (x.a_syms > 0 && (flag & RB_NOSYM) == 0) { 166 167 /* Symbol table and string table length word. */ 168 cc = (int)x.a_syms; 169 printf("+[%d", cc); 170 cc += sizeof(int); /* strtab length too */ 171 if (read(io, cp, (size_t)cc) != (size_t)cc) 172 goto shread; 173 cp += (int)x.a_syms; 174 /*LINTED*/ 175 ip = (int*)cp; /* points to strtab length */ 176 cp += sizeof(int); 177 178 /* String table. Length word includes itself. */ 179 cc = *ip; 180 printf("+%d]", cc); 181 cc -= sizeof(int); 182 if (cc <= 0) 183 goto shread; 184 if (read(io, cp, (size_t)cc) != (size_t)cc) 185 goto shread; 186 cp += cc; 187 } 188 printf("=0x%x\n", cp - loadaddr); 189 close(io); 190 191 printf("Start @ 0x%p ...\n", entry); 192 (*entry)(flag, bugargs.ctrl_addr, 193 bugargs.ctrl_lun, bugargs.dev_lun, part, cp); 194 printf("exec: kernel returned!\n"); 195 return; 196 197 shread: 198 printf("exec: short read\n"); 199 errno = EIO; 200 closeout: 201 close(io); 202 return; 203 } 204
Indexes created Mon Oct 20 16:09:52 GMT 2025