1 /* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1991, 1993 4 * The Regents of the University of California. 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 * 38 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 39 * 40 * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 41 * $FreeBSD$ 42 */ 43 44 /* 45 * Traditional sbrk/grow interface to VM 46 */ 47 48 #include <sys/param.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/proc.h> 52 #include <sys/resourcevar.h> 53 #include <sys/sysproto.h> 54 #include <sys/systm.h> 55 56 #include <vm/vm.h> 57 #include <vm/vm_param.h> 58 #include <vm/pmap.h> 59 #include <vm/vm_map.h> 60 61 #ifndef _SYS_SYSPROTO_H_ 62 struct obreak_args { 63 char *nsize; 64 }; 65 #endif 66 67 /* 68 * MPSAFE 69 */ 70 /* ARGSUSED */ 71 int 72 obreak(td, uap) 73 struct thread *td; 74 struct obreak_args *uap; 75 { 76 struct vmspace *vm = td->td_proc->p_vmspace; 77 vm_offset_t new, old, base; 78 int rv; 79 int error = 0; 80 81 mtx_lock(&Giant); /* syscall marked mp-safe but isn't */ 82 83 base = round_page((vm_offset_t) vm->vm_daddr); 84 new = round_page((vm_offset_t)uap->nsize); 85 old = base + ctob(vm->vm_dsize); 86 if (new > base) { 87 /* 88 * We check resource limits here, but alow processes to 89 * reduce their usage, even if they remain over the limit. 90 */ 91 if (new > old && 92 (new - base) > (unsigned) td->td_proc->p_rlimit[RLIMIT_DATA].rlim_cur) { 93 error = ENOMEM; 94 goto done; 95 } 96 if (new >= VM_MAXUSER_ADDRESS) { 97 error = ENOMEM; 98 goto done; 99 } 100 } else if (new < base) { 101 /* 102 * This is simply an invalid value. If someone wants to 103 * do fancy address space manipulations, mmap and munmap 104 * can do most of what the user would want. 105 */ 106 error = EINVAL; 107 goto done; 108 } 109 110 if (new > old) { 111 vm_size_t diff; 112 113 diff = new - old; 114 rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE, 115 VM_PROT_ALL, VM_PROT_ALL, 0); 116 if (rv != KERN_SUCCESS) { 117 error = ENOMEM; 118 goto done; 119 } 120 vm->vm_dsize += btoc(diff); 121 } else if (new < old) { 122 rv = vm_map_remove(&vm->vm_map, new, old); 123 if (rv != KERN_SUCCESS) { 124 error = ENOMEM; 125 goto done; 126 } 127 vm->vm_dsize -= btoc(old - new); 128 } 129 done: 130 mtx_unlock(&Giant); 131 return (error); 132 } 133 134 #ifndef _SYS_SYSPROTO_H_ 135 struct ovadvise_args { 136 int anom; 137 }; 138 #endif 139 140 /* 141 * MPSAFE 142 */ 143 /* ARGSUSED */ 144 int 145 ovadvise(td, uap) 146 struct thread *td; 147 struct ovadvise_args *uap; 148 { 149 /* START_GIANT_OPTIONAL */ 150 /* END_GIANT_OPTIONAL */ 151 return (EINVAL); 152 } 153