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
|
/* $OpenBSD: uvm_unix.c,v 1.56 2015/05/05 02:13:46 guenther Exp $ */
/* $NetBSD: uvm_unix.c,v 1.18 2000/09/13 15:00:25 thorpej Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* Copyright (c) 1991, 1993 The Regents of the University of California.
* Copyright (c) 1988 University of Utah.
*
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
*
* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
* from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp
*/
/*
* uvm_unix.c: traditional sbrk/grow interface to vm.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <uvm/uvm.h>
/*
* sys_obreak: set break
*/
int
sys_obreak(struct proc *p, void *v, register_t *retval)
{
struct sys_obreak_args /* {
syscallarg(char *) nsize;
} */ *uap = v;
struct vmspace *vm = p->p_vmspace;
vaddr_t new, old, base;
int error;
base = (vaddr_t)vm->vm_daddr;
new = round_page((vaddr_t)SCARG(uap, nsize));
if (new < base || (new - base) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
return (ENOMEM);
old = round_page(base + ptoa(vm->vm_dsize));
if (new == old)
return (0);
/* grow or shrink? */
if (new > old) {
error = uvm_map(&vm->vm_map, &old, new - old, NULL,
UVM_UNKNOWN_OFFSET, 0,
UVM_MAPFLAG(PROT_READ | PROT_WRITE,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_INHERIT_COPY,
MADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED|
UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW));
if (error) {
uprintf("sbrk: grow %ld failed, error = %d\n",
new - old, error);
return (ENOMEM);
}
vm->vm_dsize += atop(new - old);
} else {
uvm_deallocate(&vm->vm_map, new, old - new);
vm->vm_dsize -= atop(old - new);
}
return (0);
}
/*
* uvm_grow: enlarge the "stack segment" to include sp.
*/
void
uvm_grow(struct proc *p, vaddr_t sp)
{
struct vmspace *vm = p->p_vmspace;
int si;
/* For user defined stacks (from sendsig). */
if (sp < (vaddr_t)vm->vm_maxsaddr)
return;
/* For common case of already allocated (from trap). */
#ifdef MACHINE_STACK_GROWS_UP
if (sp < (vaddr_t)vm->vm_maxsaddr + ptoa(vm->vm_ssize))
#else
if (sp >= (vaddr_t)vm->vm_minsaddr - ptoa(vm->vm_ssize))
#endif
return;
/* Really need to check vs limit and increment stack size if ok. */
#ifdef MACHINE_STACK_GROWS_UP
si = atop(sp - (vaddr_t)vm->vm_maxsaddr) - vm->vm_ssize + 1;
#else
si = atop((vaddr_t)vm->vm_minsaddr - sp) - vm->vm_ssize;
#endif
if (vm->vm_ssize + si <= atop(p->p_rlimit[RLIMIT_STACK].rlim_cur))
vm->vm_ssize += si;
}
#ifndef SMALL_KERNEL
/*
* Walk the VA space for a process, invoking 'func' on each present range
* that should be included in a coredump.
*/
int
uvm_coredump_walkmap(struct proc *p, void *iocookie,
int (*func)(struct proc *, void *, struct uvm_coredump_state *),
void *cookie)
{
struct uvm_coredump_state state;
struct vmspace *vm = p->p_vmspace;
struct vm_map *map = &vm->vm_map;
struct vm_map_entry *entry;
vaddr_t top;
int error;
RB_FOREACH(entry, uvm_map_addr, &map->addr) {
state.cookie = cookie;
state.prot = entry->protection;
state.flags = 0;
/* should never happen for a user process */
if (UVM_ET_ISSUBMAP(entry)) {
panic("%s: user process with submap?", __func__);
}
if (!(entry->protection & PROT_WRITE) &&
entry->start != p->p_p->ps_sigcode)
continue;
/* Don't dump mmaped devices. */
if (entry->object.uvm_obj != NULL &&
UVM_OBJ_IS_DEVICE(entry->object.uvm_obj))
continue;
state.start = entry->start;
state.realend = entry->end;
state.end = entry->end;
if (state.start >= VM_MAXUSER_ADDRESS)
continue;
if (state.end > VM_MAXUSER_ADDRESS)
state.end = VM_MAXUSER_ADDRESS;
#ifdef MACHINE_STACK_GROWS_UP
if ((vaddr_t)vm->vm_maxsaddr <= state.start &&
state.start < ((vaddr_t)vm->vm_maxsaddr + MAXSSIZ)) {
top = round_page((vaddr_t)vm->vm_maxsaddr +
ptoa(vm->vm_ssize));
if (state.end > top)
state.end = top;
if (state.start >= state.end)
continue;
#else
if (state.start >= (vaddr_t)vm->vm_maxsaddr) {
top = trunc_page((vaddr_t)vm->vm_minsaddr -
ptoa(vm->vm_ssize));
if (state.start < top)
state.start = top;
if (state.start >= state.end)
continue;
#endif
state.flags |= UVM_COREDUMP_STACK;
}
error = (*func)(p, iocookie, &state);
if (error)
return (error);
}
return (0);
}
#endif /* !SMALL_KERNEL */
|