exec_mvme.c revision 1.5
1 /* $NetBSD: exec_mvme.c,v 1.5 1998/08/22 10:55:36 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 <a.out.h> 42 43 #include "stand.h" 44 #include "libsa.h" 45 46 /*ARGSUSED*/ 47 void 48 exec_mvme(file, flag) 49 char *file; 50 int flag; 51 { 52 char *loadaddr; 53 int io; 54 struct exec x; 55 int cc, magic; 56 void (*entry)(); 57 char *cp; 58 int *ip; 59 60 #ifdef DEBUG 61 printf("exec_mvme: file=%s flag=0x%x\n", file, flag); 62 #endif 63 64 io = open(file, 0); 65 if (io < 0) 66 return; 67 68 /* 69 * Read in the exec header, and validate it. 70 */ 71 if (read(io, (void *)&x, sizeof(x)) != sizeof(x)) 72 goto shread; 73 if (N_BADMAG(x)) { 74 errno = EFTYPE; 75 goto closeout; 76 } 77 78 /* 79 * note: on the mvme ports, the kernel is linked in such a way that 80 * its entry point is the first item in .text, and thus a_entry can 81 * be used to determine both the load address and the entry point. 82 * (also note that we make use of the fact that the kernel will live 83 * in a VA == PA range of memory ... otherwise we would take 84 * loadaddr as a parameter and let the kernel relocate itself!) 85 * 86 * note that ZMAGIC files included the a.out header in the text area 87 * so we must mask that off (has no effect on the other formats 88 */ 89 loadaddr = (void *)(x.a_entry & ~sizeof(x)); 90 91 cp = loadaddr; 92 magic = (int)N_GETMAGIC(x); 93 if (magic == ZMAGIC) 94 cp += sizeof(x); 95 /*LINTED*/ 96 entry = (void (*)())cp; 97 98 /* 99 * Leave a copy of the exec header before the text. 100 * The sun3 kernel uses this to verify that the 101 * symbols were loaded by this boot program. 102 */ 103 bcopy(&x, cp - sizeof(x), sizeof(x)); 104 105 /* 106 * Read in the text segment. 107 */ 108 printf("%d", x.a_text); 109 cc = (int)x.a_text; 110 if (magic == ZMAGIC) 111 cc = cc - sizeof(x); /* a.out header part of text in zmagic */ 112 if (read(io, cp, (size_t)cc) != (size_t)cc) 113 goto shread; 114 cp += cc; 115 116 /* 117 * NMAGIC may have a gap between text and data. 118 */ 119 if (magic == NMAGIC) { 120 int mask = N_PAGSIZ(x) - 1; 121 /*LINTED*/ 122 while ((int)cp & mask) 123 *cp++ = 0; 124 } 125 126 /* 127 * Read in the data segment. 128 */ 129 printf("+%d", x.a_data); 130 if (read(io, cp, (size_t)x.a_data) != (size_t)x.a_data) 131 goto shread; 132 cp += (int)x.a_data; 133 134 /* 135 * Zero out the BSS section. 136 * (Kernel doesn't care, but do it anyway.) 137 */ 138 printf("+%d", x.a_bss); 139 cc = (int)x.a_bss; 140 /*LINTED*/ 141 while ((int)cp & 3) { 142 *cp++ = 0; 143 --cc; 144 } 145 /*LINTED*/ 146 ip = (int*)cp; 147 cp += cc; 148 /*LINTED*/ 149 while ((char*)ip < cp) 150 *ip++ = 0; 151 152 /* 153 * Read in the symbol table and strings. 154 * (Always set the symtab size word.) 155 */ 156 *ip++ = (int)x.a_syms; 157 /*LINTED*/ 158 cp = (char*) ip; 159 160 if (x.a_syms > 0 && (flag & RB_NOSYM) == 0) { 161 162 /* Symbol table and string table length word. */ 163 cc = (int)x.a_syms; 164 printf("+[%d", cc); 165 cc += sizeof(int); /* strtab length too */ 166 if (read(io, cp, (size_t)cc) != (size_t)cc) 167 goto shread; 168 cp += (int)x.a_syms; 169 /*LINTED*/ 170 ip = (int*)cp; /* points to strtab length */ 171 cp += sizeof(int); 172 173 /* String table. Length word includes itself. */ 174 cc = *ip; 175 printf("+%d]", cc); 176 cc -= sizeof(int); 177 if (cc <= 0) 178 goto shread; 179 if (read(io, cp, (size_t)cc) != (size_t)cc) 180 goto shread; 181 cp += cc; 182 } 183 printf("=0x%x\n", cp - loadaddr); 184 close(io); 185 186 printf("Start @ 0x%p ...\n", entry); 187 (*entry)(flag, bugargs.ctrl_addr, 188 bugargs.ctrl_lun, bugargs.dev_lun, 0, cp); 189 printf("exec: kernel returned!\n"); 190 return; 191 192 shread: 193 printf("exec: short read\n"); 194 errno = EIO; 195 closeout: 196 close(io); 197 return; 198 } 199
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