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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1988 University of Utah. | |
3 | * Copyright (c) 1991 The Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * the Systems Programming Group of the University of Utah Computer | |
8 | * Science Department. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. All advertising materials mentioning features or use of this software | |
19 | * must display the following acknowledgement: | |
20 | * This product includes software developed by the University of | |
21 | * California, Berkeley and its contributors. | |
22 | * 4. Neither the name of the University nor the names of its contributors | |
23 | * may be used to endorse or promote products derived from this software | |
24 | * without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
36 | * SUCH DAMAGE. | |
37 | * | |
1284e777 RG |
38 | * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ |
39 | * from: @(#)vm_unix.c 7.2 (Berkeley) 4/20/91 | |
4c45483e | 40 | * $Id: vm_unix.c,v 1.3 1993/10/16 16:20:58 rgrimes Exp $ |
15637ed4 RG |
41 | */ |
42 | ||
43 | /* | |
44 | * Traditional sbrk/grow interface to VM | |
45 | */ | |
46 | #include "param.h" | |
47 | #include "systm.h" | |
48 | #include "proc.h" | |
49 | #include "resourcevar.h" | |
50 | ||
51 | #include "vm.h" | |
52 | ||
3c7eb27c DG |
53 | struct obreak_args { |
54 | char *nsiz; | |
55 | }; | |
56 | ||
15637ed4 | 57 | /* ARGSUSED */ |
4c45483e | 58 | int |
15637ed4 RG |
59 | obreak(p, uap, retval) |
60 | struct proc *p; | |
3c7eb27c | 61 | struct obreak_args *uap; |
15637ed4 RG |
62 | int *retval; |
63 | { | |
64 | register struct vmspace *vm = p->p_vmspace; | |
65 | vm_offset_t new, old; | |
66 | int rv; | |
67 | register int diff; | |
68 | ||
69 | old = (vm_offset_t)vm->vm_daddr; | |
70 | new = round_page(uap->nsiz); | |
71 | if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) | |
72 | return(ENOMEM); | |
73 | old = round_page(old + ctob(vm->vm_dsize)); | |
74 | diff = new - old; | |
75 | if (diff > 0) { | |
76 | rv = vm_allocate(&vm->vm_map, &old, diff, FALSE); | |
77 | if (rv != KERN_SUCCESS) { | |
78 | uprintf("sbrk: grow failed, return = %d\n", rv); | |
79 | return(ENOMEM); | |
80 | } | |
81 | vm->vm_dsize += btoc(diff); | |
82 | } else if (diff < 0) { | |
83 | diff = -diff; | |
84 | rv = vm_deallocate(&vm->vm_map, new, diff); | |
85 | if (rv != KERN_SUCCESS) { | |
86 | uprintf("sbrk: shrink failed, return = %d\n", rv); | |
87 | return(ENOMEM); | |
88 | } | |
89 | vm->vm_dsize -= btoc(diff); | |
90 | } | |
91 | return(0); | |
92 | } | |
93 | ||
94 | /* | |
95 | * Enlarge the "stack segment" to include the specified | |
96 | * stack pointer for the process. | |
97 | */ | |
4c45483e | 98 | int |
15637ed4 RG |
99 | grow(p, sp) |
100 | struct proc *p; | |
101 | unsigned sp; | |
102 | { | |
103 | register struct vmspace *vm = p->p_vmspace; | |
104 | register int si; | |
105 | ||
106 | /* | |
107 | * For user defined stacks (from sendsig). | |
108 | */ | |
109 | if (sp < (unsigned)vm->vm_maxsaddr) | |
110 | return (0); | |
111 | /* | |
112 | * For common case of already allocated (from trap). | |
113 | */ | |
114 | if (sp >= (unsigned)vm->vm_maxsaddr + MAXSSIZ - ctob(vm->vm_ssize)) | |
115 | return (1); | |
116 | /* | |
117 | * Really need to check vs limit and increment stack size if ok. | |
118 | */ | |
119 | si = clrnd(btoc(vm->vm_maxsaddr + MAXSSIZ - sp) - vm->vm_ssize); | |
120 | if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) | |
121 | return (0); | |
122 | vm->vm_ssize += si; | |
123 | return (1); | |
124 | } | |
125 | ||
3c7eb27c DG |
126 | struct ovadvise_args { |
127 | int anom; | |
128 | }; | |
129 | ||
15637ed4 | 130 | /* ARGSUSED */ |
4c45483e | 131 | int |
15637ed4 RG |
132 | ovadvise(p, uap, retval) |
133 | struct proc *p; | |
3c7eb27c | 134 | struct ovadvise_args *uap; |
15637ed4 RG |
135 | int *retval; |
136 | { | |
137 | ||
138 | return (EINVAL); | |
139 | } |