Annotation of sys/arch/aviion/stand/libsa/exec_aout.c, Revision 1.1.1.1
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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