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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/*
* Copyright (c) 1993, David Greenman
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by David Greenman
* 4. The name of the developer may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* $Id: imgact_aout.c,v 1.8 1994/09/24 21:36:50 davidg Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/exec.h>
#include <sys/mman.h>
#include <sys/imgact.h>
#include <sys/imgact_aout.h>
#include <sys/kernel.h>
#include <sys/sysent.h>
#include <vm/vm.h>
int
exec_aout_imgact(iparams)
struct image_params *iparams;
{
struct exec *a_out = (struct exec *) iparams->image_header;
struct vmspace *vmspace = iparams->proc->p_vmspace;
unsigned long vmaddr, virtual_offset, file_offset;
unsigned long bss_size;
int error;
extern struct sysentvec aout_sysvec;
/*
* Set file/virtual offset based on a.out variant.
* We do two cases: host byte order and network byte order
* (for NetBSD compatibility)
*/
switch ((int)(a_out->a_magic & 0xffff)) {
case ZMAGIC:
virtual_offset = 0;
if (a_out->a_text) {
file_offset = NBPG;
} else {
/* Bill's "screwball mode" */
file_offset = 0;
}
break;
case QMAGIC:
virtual_offset = NBPG;
file_offset = 0;
break;
default:
/* NetBSD compatibility */
switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
case ZMAGIC:
case QMAGIC:
virtual_offset = NBPG;
file_offset = 0;
break;
default:
return (-1);
}
}
bss_size = roundup(a_out->a_bss, NBPG);
/*
* Check various fields in header for validity/bounds.
*/
if (/* entry point must lay with text region */
a_out->a_entry < virtual_offset ||
a_out->a_entry >= virtual_offset + a_out->a_text ||
/* text and data size must each be page rounded */
a_out->a_text % NBPG ||
a_out->a_data % NBPG)
return (-1);
/* text + data can't exceed file size */
if (a_out->a_data + a_out->a_text > iparams->attr->va_size)
return (EFAULT);
/*
* text/data/bss must not exceed limits
*/
if (/* text can't exceed maximum text size */
a_out->a_text > MAXTSIZ ||
/* data + bss can't exceed maximum data size */
a_out->a_data + bss_size > MAXDSIZ ||
/* data + bss can't exceed rlimit */
a_out->a_data + bss_size >
iparams->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
return (ENOMEM);
/* copy in arguments and/or environment from old process */
error = exec_extract_strings(iparams);
if (error)
return (error);
/*
* Destroy old process VM and create a new one (with a new stack)
*/
exec_new_vmspace(iparams);
/*
* Map text read/execute
*/
vmaddr = virtual_offset;
error =
vm_mmap(&vmspace->vm_map, /* map */
&vmaddr, /* address */
a_out->a_text, /* size */
VM_PROT_READ | VM_PROT_EXECUTE, /* protection */
VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* max protection */
MAP_PRIVATE | MAP_FIXED, /* flags */
(caddr_t)iparams->vnodep, /* vnode */
file_offset); /* offset */
if (error)
return (error);
/*
* Map data read/write (if text is 0, assume text is in data area
* [Bill's screwball mode])
*/
vmaddr = virtual_offset + a_out->a_text;
error =
vm_mmap(&vmspace->vm_map,
&vmaddr,
a_out->a_data,
VM_PROT_READ | VM_PROT_WRITE | (a_out->a_text ? 0 : VM_PROT_EXECUTE),
VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
(caddr_t) iparams->vnodep,
file_offset + a_out->a_text);
if (error)
return (error);
/*
* Allocate demand-zeroed area for uninitialized data
* "bss" = 'block started by symbol' - named after the IBM 7090
* instruction of the same name.
*/
vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
error = vm_allocate(&vmspace->vm_map, &vmaddr, bss_size, FALSE);
if (error)
return (error);
/* Fill in process VM information */
vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
vmspace->vm_taddr = (caddr_t) virtual_offset;
vmspace->vm_daddr = (caddr_t) virtual_offset + a_out->a_text;
/* Fill in image_params */
iparams->interpreted = 0;
iparams->entry_addr = a_out->a_entry;
iparams->proc->p_sysent = &aout_sysvec;
return (0);
}
/*
* Tell kern_execve.c about it, with a little help from the linker.
* Since `const' objects end up in the text segment, TEXT_SET is the
* correct directive to use.
*/
static const struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
TEXT_SET(execsw_set, aout_execsw);
|
