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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/* $OpenBSD: osf1_mmap.c,v 1.6 2006/03/04 19:33:21 miod Exp $ */
/* $NetBSD: osf1_mmap.c,v 1.5 2000/04/11 05:26:27 chs Exp $ */
/*
* Copyright (c) 1999 Christopher G. Demetriou. 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 Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <uvm/uvm.h>
#include <compat/osf1/osf1.h>
#include <compat/osf1/osf1_syscallargs.h>
#include <compat/osf1/osf1_cvt.h>
int
osf1_sys_madvise(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct osf1_sys_madvise_args *uap = v;
struct sys_madvise_args a;
int error;
SCARG(&a, addr) = SCARG(uap, addr);
SCARG(&a, len) = SCARG(uap, len);
error = 0;
switch (SCARG(uap, behav)) {
case OSF1_MADV_NORMAL:
SCARG(&a, behav) = MADV_NORMAL;
break;
case OSF1_MADV_RANDOM:
SCARG(&a, behav) = MADV_RANDOM;
break;
case OSF1_MADV_SEQUENTIAL:
SCARG(&a, behav) = MADV_SEQUENTIAL;
break;
case OSF1_MADV_WILLNEED:
SCARG(&a, behav) = MADV_WILLNEED;
break;
case OSF1_MADV_DONTNEED_COMPAT:
SCARG(&a, behav) = MADV_DONTNEED;
break;
#if 0
case OSF1_MADV_SPACEAVAIL:
SCARG(&a, behav) = MADV_SPACEAVAIL;
break;
#endif
case OSF1_MADV_DONTNEED:
/*
* XXX not supported. In Digital UNIX, this flushes all
* XXX data in the region and replaces it with ZFOD pages.
*/
error = EINVAL;
break;
default:
error = EINVAL;
break;
}
if (error == 0) {
error = sys_madvise(p, &a, retval);
/*
* NetBSD madvise() currently always returns ENOSYS.
* Digital UNIX says that non-operational requests (i.e.
* valid, but unimplemented 'behav') will return success.
*/
if (error == ENOSYS)
error = 0;
}
return (error);
}
int
osf1_sys_mmap(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct osf1_sys_mmap_args *uap = v;
struct sys_mmap_args a;
unsigned long leftovers;
SCARG(&a, addr) = SCARG(uap, addr);
SCARG(&a, len) = SCARG(uap, len);
SCARG(&a, fd) = SCARG(uap, fd);
SCARG(&a, pad) = 0;
SCARG(&a, pos) = SCARG(uap, pos);
/* translate prot */
SCARG(&a, prot) = emul_flags_translate(osf1_mmap_prot_xtab,
SCARG(uap, prot), &leftovers);
if (leftovers != 0)
return (EINVAL);
/* translate flags */
SCARG(&a, flags) = emul_flags_translate(osf1_mmap_flags_xtab,
SCARG(uap, flags), &leftovers);
if (leftovers != 0)
return (EINVAL);
/*
* XXX The following code is evil.
*
* The OSF/1 mmap() function attempts to map non-fixed entries
* near the address that the user specified. Therefore, for
* non-fixed entries we try to find space in the address space
* starting at that address. If the user specified zero, we
* start looking at at least NBPG, so that programs can't
* accidentally live through deferencing NULL.
*
* The need for this kludgery is increased by the fact that
* the loader data segment is mapped at
* (end of user address space) - 1G, MAXDSIZ is 1G, and
* the VM system tries allocate non-fixed mappings _AFTER_
* (start of data) + MAXDSIZ. With the loader, of course,
* that means that it'll start trying at
* (end of user address space), and will never succeed!
*
* Notes:
*
* * Though we find space here, if something else (e.g. a second
* thread) were mucking with the address space the mapping
* we found might be used by another mmap(), and this call
* would clobber that region.
*
* * In general, tricks like this only work for MAP_ANON mappings,
* because of sharing/cache issues. That's not a problem on
* the Alpha, and though it's not good style to abuse that fact,
* there's little choice.
*
* * In order for this to be done right, the VM system should
* really try to use the requested 'addr' passed in to mmap()
* as a hint, even if non-fixed. If it's passed as zero,
* _maybe_ then try (start of data) + MAXDSIZ, or maybe
* provide a better way to avoid the data region altogether.
*/
if ((SCARG(&a, flags) & MAP_FIXED) == 0) {
vaddr_t addr = round_page((vaddr_t)SCARG(&a, addr));
vsize_t size = round_page((vsize_t)SCARG(&a, len));
int fixed = 0;
vm_map_lock(&p->p_vmspace->vm_map);
/* if non-NULL address given, start looking there */
/* XXX - UVM */
if (addr != 0 && uvm_map_findspace(&p->p_vmspace->vm_map,
addr, size, &addr, NULL, 0, 0, 0) != NULL) {
fixed = 1;
goto done;
}
/* didn't find anything. take it again from the top. */
if (uvm_map_findspace(&p->p_vmspace->vm_map, NBPG, size, &addr,
NULL, 0, 0, 0) != NULL) {
fixed = 1;
goto done;
}
done:
vm_map_unlock(&p->p_vmspace->vm_map);
if (fixed) {
SCARG(&a, flags) |= MAP_FIXED;
SCARG(&a, addr) = (void *)addr;
}
}
return sys_mmap(p, &a, retval);
}
int
osf1_sys_mprotect(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct osf1_sys_mprotect_args *uap = v;
struct sys_mprotect_args a;
unsigned long leftovers;
SCARG(&a, addr) = SCARG(uap, addr);
SCARG(&a, len) = SCARG(uap, len);
/* translate prot */
SCARG(&a, prot) = emul_flags_translate(osf1_mmap_prot_xtab,
SCARG(uap, prot), &leftovers);
if (leftovers != 0)
return (EINVAL);
return sys_mprotect(p, &a, retval);
}
|
