exec_mvme.c revision 1.8
1 /* $NetBSD: exec_mvme.c,v 1.8 2000/07/24 09:25:53 scw 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 47 /* This must agree with what locore.s expects */ 48 typedef void (*kentry_t)(int, u_int, u_int, u_int, int, char *); 49 50 51 /*ARGSUSED*/ 52 void 53 exec_mvme(file, flag, part) 54 char *file; 55 int flag; 56 int part; 57 { 58 char *loadaddr; 59 int io; 60 struct exec x; 61 int cc, magic; 62 kentry_t *entry; 63 char *cp; 64 int *ip; 65 66 #ifdef DEBUG 67 printf("exec_mvme: partition=%d, file=%s flag=0x%x\n", part, file, flag); 68 #endif 69 70 io = open(file, 0); 71 if (io < 0) 72 return; 73 74 /* 75 * Read in the exec header, and validate it. 76 */ 77 if (read(io, (void *)&x, sizeof(x)) != sizeof(x)) 78 goto shread; 79 if (N_BADMAG(x)) { 80 errno = EFTYPE; 81 goto closeout; 82 } 83 84 /* 85 * note: on the mvme ports, the kernel is linked in such a way that 86 * its entry point is the first item in .text, and thus a_entry can 87 * be used to determine both the load address and the entry point. 88 * (also note that we make use of the fact that the kernel will live 89 * in a VA == PA range of memory ... otherwise we would take 90 * loadaddr as a parameter and let the kernel relocate itself!) 91 * 92 * note that ZMAGIC files included the a.out header in the text area 93 * so we must mask that off (has no effect on the other formats 94 */ 95 loadaddr = (void *)(x.a_entry & ~sizeof(x)); 96 97 cp = loadaddr; 98 magic = (int)N_GETMAGIC(x); 99 if (magic == ZMAGIC) 100 cp += sizeof(x); 101 /*LINTED*/ 102 entry = (kentry_t *) cp; 103 104 /* 105 * Leave a copy of the exec header before the text. 106 * The sun3 kernel uses this to verify that the 107 * symbols were loaded by this boot program. 108 */ 109 bcopy(&x, cp - sizeof(x), sizeof(x)); 110 111 /* 112 * Read in the text segment. 113 */ 114 printf("%ld", x.a_text); 115 cc = (int)x.a_text; 116 if (magic == ZMAGIC) 117 cc = cc - sizeof(x); /* a.out header part of text in zmagic */ 118 if (read(io, cp, (size_t)cc) != (size_t)cc) 119 goto shread; 120 cp += cc; 121 122 /* 123 * NMAGIC may have a gap between text and data. 124 */ 125 if (magic == NMAGIC) { 126 int mask = N_PAGSIZ(x) - 1; 127 /*LINTED*/ 128 while ((int)cp & mask) 129 *cp++ = 0; 130 } 131 132 /* 133 * Read in the data segment. 134 */ 135 printf("+%ld", x.a_data); 136 if (read(io, cp, (size_t)x.a_data) != (size_t)x.a_data) 137 goto shread; 138 cp += (int)x.a_data; 139 140 /* 141 * Zero out the BSS section. 142 * (Kernel doesn't care, but do it anyway.) 143 */ 144 printf("+%ld", x.a_bss); 145 cc = (int)x.a_bss; 146 /*LINTED*/ 147 while ((int)cp & 3) { 148 *cp++ = 0; 149 --cc; 150 } 151 /*LINTED*/ 152 ip = (int*)cp; 153 cp += cc; 154 /*LINTED*/ 155 while ((char*)ip < cp) 156 *ip++ = 0; 157 158 /* 159 * Read in the symbol table and strings. 160 * (Always set the symtab size word.) 161 */ 162 *ip++ = (int)x.a_syms; 163 /*LINTED*/ 164 cp = (char*) ip; 165 166 if (x.a_syms > 0 && (flag & RB_NOSYM) == 0) { 167 168 /* Symbol table and string table length word. */ 169 cc = (int)x.a_syms; 170 printf("+[%d", cc); 171 cc += sizeof(int); /* strtab length too */ 172 if (read(io, cp, (size_t)cc) != (size_t)cc) 173 goto shread; 174 cp += (int)x.a_syms; 175 /*LINTED*/ 176 ip = (int*)cp; /* points to strtab length */ 177 cp += sizeof(int); 178 179 /* String table. Length word includes itself. */ 180 cc = *ip; 181 printf("+%d]", cc); 182 cc -= sizeof(int); 183 if (cc <= 0) 184 goto shread; 185 if (read(io, cp, (size_t)cc) != (size_t)cc) 186 goto shread; 187 cp += cc; 188 } 189 printf("=0x%x\n", cp - loadaddr); 190 close(io); 191 192 printf("Start @ 0x%p ...\n", entry); 193 (*entry)(flag, bugargs.ctrl_addr, 194 bugargs.ctrl_lun, bugargs.dev_lun, part, cp); 195 printf("exec: kernel returned!\n"); 196 return; 197 198 shread: 199 printf("exec: short read\n"); 200 errno = EIO; 201 closeout: 202 close(io); 203 return; 204 } 205
Indexes created Tue Sep 30 07:10:03 GMT 2025