Annotation of sys/arch/aviion/stand/libsa/exec_aout.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: exec_aout.c,v 1.2 2006/05/20 22:40:46 miod 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. Neither the name of the University nor the names of its contributors
! 16: * may be used to endorse or promote products derived from this software
! 17: * without specific prior written permission.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 29: * SUCH DAMAGE.
! 30: *
! 31: * @(#)boot.c 8.1 (Berkeley) 6/10/93
! 32: */
! 33:
! 34: #include <sys/param.h>
! 35: #include <sys/reboot.h>
! 36: #include <machine/prom.h>
! 37: #include <a.out.h>
! 38:
! 39: #include "stand.h"
! 40: #include "libsa.h"
! 41:
! 42: #define SYM_MAGIC 0x6274ef2e
! 43:
! 44: /*ARGSUSED*/
! 45: void
! 46: exec_aout(char *file, const char *args, int bootdev, int bootunit, int bootpart)
! 47: {
! 48: char *loadaddr;
! 49: int io;
! 50: struct exec x;
! 51: int cc, magic;
! 52: void (*entry)();
! 53: char *cp;
! 54: int *ip;
! 55:
! 56: io = open(file, 0);
! 57: if (io < 0)
! 58: return;
! 59:
! 60: /*
! 61: * Read in the exec header, and validate it.
! 62: */
! 63: if (read(io, (char *)&x, sizeof(x)) != sizeof(x))
! 64: goto shread;
! 65:
! 66: if (N_BADMAG(x)) {
! 67: errno = EFTYPE;
! 68: goto closeout;
! 69: }
! 70:
! 71: /*
! 72: * note: on the mvme ports, the kernel is linked in such a way that
! 73: * its entry point is the first item in .text, and thus a_entry can
! 74: * be used to determine both the load address and the entry point.
! 75: * (also note that we make use of the fact that the kernel will live
! 76: * in a VA == PA range of memory ... otherwise we would take
! 77: * loadaddr as a parameter and let the kernel relocate itself!)
! 78: *
! 79: * note that ZMAGIC files included the a.out header in the text area
! 80: * so we must mask that off (has no effect on the other formats)
! 81: */
! 82: loadaddr = (void *)(x.a_entry & ~sizeof(x));
! 83:
! 84: cp = loadaddr;
! 85: magic = N_GETMAGIC(x);
! 86: if (magic == ZMAGIC)
! 87: cp += sizeof(x);
! 88: entry = (void (*)())cp;
! 89:
! 90: /*
! 91: * Read in the text segment.
! 92: */
! 93: printf("%d", x.a_text);
! 94: cc = x.a_text;
! 95: if (magic == ZMAGIC)
! 96: cc = cc - sizeof(x); /* a.out header part of text in zmagic */
! 97: if (read(io, cp, cc) != cc)
! 98: goto shread;
! 99: cp += cc;
! 100:
! 101: /*
! 102: * NMAGIC may have a gap between text and data.
! 103: */
! 104: if (magic == NMAGIC) {
! 105: register int mask = N_PAGSIZ(x) - 1;
! 106: while ((int)cp & mask)
! 107: *cp++ = 0;
! 108: }
! 109:
! 110: /*
! 111: * Read in the data segment.
! 112: */
! 113: printf("+%d", x.a_data);
! 114: if (read(io, cp, x.a_data) != x.a_data)
! 115: goto shread;
! 116: cp += x.a_data;
! 117:
! 118: /*
! 119: * Zero out the BSS section.
! 120: */
! 121: printf("+%d", x.a_bss);
! 122: cc = x.a_bss;
! 123: while ((int)cp & 3) {
! 124: *cp++ = 0;
! 125: --cc;
! 126: }
! 127: ip = (int *)cp;
! 128: cp += cc;
! 129: while ((char *)ip < cp)
! 130: *ip++ = 0;
! 131:
! 132: /*
! 133: * Read in the symbol table and strings.
! 134: * (Always set the symtab size word.)
! 135: */
! 136: *ip++ = x.a_syms;
! 137: cp = (char *) ip;
! 138:
! 139: if (x.a_syms > 0) {
! 140: /* Symbol table and string table length word. */
! 141: cc = x.a_syms;
! 142: printf("+[%d", cc);
! 143: cc += sizeof(int); /* strtab length too */
! 144: if (read(io, cp, cc) != cc)
! 145: goto shread;
! 146: cp += x.a_syms;
! 147: ip = (int *)cp; /* points to strtab length */
! 148: cp += sizeof(int);
! 149:
! 150: /* String table. Length word includes itself. */
! 151: cc = *ip;
! 152: printf("+%d]", cc);
! 153: cc -= sizeof(int);
! 154: if (cc <= 0)
! 155: goto shread;
! 156: if (read(io, cp, cc) != cc)
! 157: goto shread;
! 158: cp += cc;
! 159: }
! 160: printf("=0x%lx\n", cp - loadaddr);
! 161: close(io);
! 162:
! 163: (*entry)(args, bootdev, bootunit, bootpart, SYM_MAGIC, cp);
! 164:
! 165: printf("exec: kernel returned!\n");
! 166: return;
! 167:
! 168: shread:
! 169: printf("exec: short read\n");
! 170: errno = EIO;
! 171: closeout:
! 172: close(io);
! 173: return;
! 174: }
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