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1.1 root 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * William Jolitz.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: char copyright[] =
39: "@(#) Copyright (c) 1990 The Regents of the University of California.\n\
40: All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: static char sccsid[] = "@(#)boot.c 7.3 (Berkeley) 5/4/91";
45: #endif /* not lint */
46:
47: #include "param.h"
48: #include "reboot.h"
49: #include <a.out.h>
50: #include <setjmp.h>
51: #include "saio.h"
52:
53: /*
54: * Boot program... arguments from lower-level bootstrap determine
55: * whether boot stops to ask for system name and which device
56: * boot comes from.
57: */
58:
59: char line[100] = UNIX;
60: extern int opendev, bootdev, cyloffset;
61: int retry = 0;
62: extern jmp_buf exception;
63:
64: main(howto, dev, off)
65: {
66: int io;
67:
68: if((dev&B_MAGICMASK) == B_DEVMAGIC) {
69: bootdev = dev;
70: cyloffset = off;
71: } else goto again;
72:
73: if(_setjmp(exception)) {
74: close(io);
75: printf("- load aborted\n");
76: again:
77: howto = RB_SINGLE|RB_ASKNAME;
78: cyloffset = 0;
79: }
80:
81: for (;;) {
82: if (howto & RB_ASKNAME) {
83: char *cp;
84:
85: printf("Boot: ");
86: gets(line);
87:
88: /* process additional flags if any */
89: if(cp = (char *)index(line, ' ')) {
90: howto = strtol (cp, 0, 0);
91: *cp = '\0';
92: }
93: cyloffset = 0;
94: } else
95: printf("Boot: %s\n", line);
96:
97: if (line[0] == 0) {
98: strcpy(line, UNIX);
99: printf("Boot: %s\n", line);
100: }
101:
102: io = open(line, 0);
103: if (io >= 0) {
104: copyunix(io, howto);
105: goto again;
106: } else if (++retry > 2)
107: goto again;
108: }
109: }
110:
111: /*ARGSUSED*/
112: copyunix(io, howto)
113: register io;
114: {
115: struct exec x;
116: int i;
117: char *addr,c;
118:
119: i = read(io, (char *)&x, sizeof x);
120: if (i != sizeof x ||
121: (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410)) {
122: printf("Bad format\n");
123: return;
124: }
125:
126: printf("%d", x.a_text);
127: if (x.a_magic == 0413 && lseek(io, 0x400, 0) == -1)
128: goto shread;
129: if (read(io, (char *)0, x.a_text) != x.a_text)
130: goto shread;
131:
132: addr = (char *)x.a_text;
133: if (x.a_magic == 0413 || x.a_magic == 0410)
134: while ((int)addr & CLOFSET)
135: *addr++ = 0;
136: printf("+%d", x.a_data);
137: if (read(io, addr, x.a_data) != x.a_data)
138: goto shread;
139:
140: addr += x.a_data;
141: printf("+%d", x.a_bss);
142: x.a_bss += 128*512; /* slop */
143: for (i = 0; i < x.a_bss; i++)
144: *addr++ = 0;
145:
146: /* mask high order bits corresponding to relocated system base */
147: x.a_entry &= 0xfff00000;
148: printf(" start 0x%x\n", x.a_entry);
149:
150: if(c=scankbd())
151: _longjmp(&exception,1);
152:
153: i = (*((int (*)()) x.a_entry))(howto, opendev, 0, cyloffset);
154:
155: if (i) printf("exit %d\n", i) ;
156: return;
157: shread:
158: printf("Short read\n");
159: return;
160: }
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