1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/* $OpenBSD: exec_aout.c,v 1.9 2009/01/19 20:07:58 miod Exp $ */
/*
* Copyright (c) 1999 Mats O Jansson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LINT
static char rcsid[] = "$OpenBSD: exec_aout.c,v 1.9 2009/01/19 20:07:58 miod Exp $";
#endif
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <nlist.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/exec.h>
#include <sys/types.h>
#include "config.h"
#include "ukc.h"
caddr_t aout_p, aout_r;
unsigned long aout_psz = 0, aout_rsz = 0;
struct exec aout_ex;
unsigned long aout_adjvalue = 0;
unsigned long aout_datashift = 0;
void
aout_computeadj(void)
{
aout_adjvalue = (unsigned long)aout_p +
N_TXTOFF(aout_ex) - nl[P_KERNEL_TEXT].n_value;
/*
* On m68k a.out ZMAGIC kernel, kernel_text begins _after_ the a.out
* header, so compensate for it.
*/
if (nl[P_KERNEL_TEXT].n_value & (__LDPGSZ - 1))
aout_adjvalue += sizeof(aout_ex);
/*
* On NMAGIC kernel, we need an extra relocation for the data area
*/
aout_datashift = (N_DATADDR(aout_ex) - N_TXTADDR(aout_ex)) -
aout_ex.a_text;
}
/* ``kernel'' vaddr -> in-memory address */
caddr_t
aout_adjust(caddr_t x)
{
if (aout_adjvalue == 0)
aout_computeadj();
if (aout_datashift != 0 &&
(unsigned long)x >= N_DATADDR(aout_ex) - N_TXTADDR(aout_ex))
x -= aout_datashift;
return (x + aout_adjvalue);
}
/* in-memory address -> ``kernel'' vaddr */
caddr_t
aout_readjust(x)
caddr_t x;
{
caddr_t y;
#if 0 /* unnecessary, aout_adjust() is always invoked first */
if (aout_adjvalue == 0)
aout_computeadj();
#endif
y = x - aout_adjvalue;
if (aout_datashift != 0 &&
(unsigned long)y >= N_TXTADDR(aout_ex) + aout_ex.a_text)
y += aout_datashift;
return (y);
}
int
aout_check(file)
char *file;
{
int fd, ret = 1;
if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0)
return (0);
if (read(fd, (char *)&aout_ex, sizeof(aout_ex)) != sizeof(aout_ex))
ret = 0;
if (ret) {
if (N_BADMAG(aout_ex))
ret = 0;
}
close(fd);
return (ret);
}
void
aout_loadkernel(char *file)
{
int fd;
off_t cur, end;
if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0)
err(1, "%s", file);
if (read(fd, (char *)&aout_ex, sizeof(aout_ex)) != sizeof(aout_ex))
errx(1, "can't read a.out header");
if (N_BADMAG(aout_ex))
errx(1, "bad a.out magic");
lseek(fd, (off_t)0, SEEK_SET);
aout_psz = (int)(aout_ex.a_text + N_TXTOFF(aout_ex) +
aout_ex.a_data);
aout_p = emalloc(aout_psz);
if (read(fd, aout_p, aout_psz) != aout_psz)
errx(1, "can't read a.out text and data");
cur = lseek(fd, (off_t)0, SEEK_CUR);
end = lseek(fd, (off_t)0, SEEK_END);
(void)lseek(fd, cur, SEEK_SET);
aout_rsz = (int)(end - cur);
aout_r = emalloc(aout_rsz);
if (read(fd, aout_r, aout_rsz) != aout_rsz)
errx(1, "can't read rest of file %s", file);
close(fd);
}
void
aout_savekernel(char *outfile)
{
int fd;
if ((fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0755)) < 0)
err(1, "%s", outfile);
if (write(fd, aout_p, aout_psz) != aout_psz)
errx(1, "can't write a.out text and data");
if (write(fd, aout_r, aout_rsz) != aout_rsz)
errx(1, "can't write rest of file %s", outfile);
close(fd);
}
|
