FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_unix.c
1 /* $NetBSD: uvm_unix.c,v 1.30 2004/08/28 12:44:22 jdolecek Exp $ */
2
3 /*
4 * Copyright (c) 1997 Charles D. Cranor and Washington University.
5 * Copyright (c) 1991, 1993 The Regents of the University of California.
6 * Copyright (c) 1988 University of Utah.
7 *
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * the Systems Programming Group of the University of Utah Computer
12 * Science Department.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by Charles D. Cranor,
25 * Washington University, the University of California, Berkeley and
26 * its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 * may be used to endorse or promote products derived from this software
29 * without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
44 * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
45 * from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp
46 */
47
48 /*
49 * uvm_unix.c: traditional sbrk/grow interface to vm.
50 */
51
52 #include <sys/cdefs.h>
53 __KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.30 2004/08/28 12:44:22 jdolecek Exp $");
54
55 #include <sys/param.h>
56 #include <sys/systm.h>
57 #include <sys/proc.h>
58 #include <sys/resourcevar.h>
59 #include <sys/vnode.h>
60
61 #include <sys/mount.h>
62 #include <sys/sa.h>
63 #include <sys/syscallargs.h>
64
65 #include <uvm/uvm.h>
66
67 /*
68 * sys_obreak: set break
69 */
70
71 int
72 sys_obreak(l, v, retval)
73 struct lwp *l;
74 void *v;
75 register_t *retval;
76 {
77 struct sys_obreak_args /* {
78 syscallarg(char *) nsize;
79 } */ *uap = v;
80 struct proc *p = l->l_proc;
81 struct vmspace *vm = p->p_vmspace;
82 vaddr_t new, old;
83 int error;
84
85 old = (vaddr_t)vm->vm_daddr;
86 new = round_page((vaddr_t)SCARG(uap, nsize));
87 if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old)
88 return (ENOMEM);
89
90 old = round_page(old + ptoa(vm->vm_dsize));
91
92 if (new == old)
93 return (0);
94
95 /*
96 * grow or shrink?
97 */
98
99 if (new > old) {
100 error = uvm_map(&vm->vm_map, &old, new - old, NULL,
101 UVM_UNKNOWN_OFFSET, 0,
102 UVM_MAPFLAG(UVM_PROT_READ | UVM_PROT_WRITE, UVM_PROT_ALL,
103 UVM_INH_COPY,
104 UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED|
105 UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW));
106 if (error) {
107 uprintf("sbrk: grow %ld failed, error = %d\n",
108 new - old, error);
109 return (error);
110 }
111 vm->vm_dsize += atop(new - old);
112 } else {
113 uvm_deallocate(&vm->vm_map, new, old - new);
114 vm->vm_dsize -= atop(old - new);
115 }
116 return (0);
117 }
118
119 /*
120 * uvm_grow: enlarge the "stack segment" to include sp.
121 */
122
123 int
124 uvm_grow(p, sp)
125 struct proc *p;
126 vaddr_t sp;
127 {
128 struct vmspace *vm = p->p_vmspace;
129 vsize_t nss;
130
131 /*
132 * For user defined stacks (from sendsig).
133 */
134 if (sp < (vaddr_t)vm->vm_maxsaddr)
135 return (0);
136
137 /*
138 * For common case of already allocated (from trap).
139 */
140 if (sp >= USRSTACK - ctob(vm->vm_ssize))
141 return (1);
142
143 /*
144 * Really need to check vs limit and increment stack size if ok.
145 */
146 nss = btoc(USRSTACK - sp);
147 if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
148 return (0);
149 vm->vm_ssize = nss;
150 return (1);
151 }
152
153 /*
154 * sys_oadvise: old advice system call
155 */
156
157 /* ARGSUSED */
158 int
159 sys_ovadvise(l, v, retval)
160 struct lwp *l;
161 void *v;
162 register_t *retval;
163 {
164 #if 0
165 struct sys_ovadvise_args /* {
166 syscallarg(int) anom;
167 } */ *uap = v;
168 #endif
169
170 return (EINVAL);
171 }
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