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 #include "opt_bleed.h" 48 49 #include <sys/param.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/proc.h> 53 #include <sys/resourcevar.h> 54 #include <sys/sysproto.h> 55 #include <sys/systm.h> 56 57 #include <vm/vm.h> 58 #include <vm/vm_param.h> 59 #include <vm/pmap.h> 60 #include <vm/vm_map.h> 61 62 #ifndef _SYS_SYSPROTO_H_ 63 struct obreak_args { 64 char *nsize; 65 }; 66 #endif 67 68 /* 69 * MPSAFE 70 */ 71 /* ARGSUSED */ 72 int 73 obreak(td, uap) 74 struct thread *td; 75 struct obreak_args *uap; 76 { 77 struct vmspace *vm = td->td_proc->p_vmspace; 78 vm_offset_t new, old, base; 79 int rv; 80 int error = 0; 81 82 mtx_lock(&Giant); /* syscall marked mp-safe but isn't */ 83 84 base = round_page((vm_offset_t) vm->vm_daddr); 85 new = round_page((vm_offset_t)uap->nsize); 86 old = base + ctob(vm->vm_dsize); 87 if (new > base) { 88 /* 89 * We check resource limits here, but alow processes to 90 * reduce their usage, even if they remain over the limit. 91 */ 92 if (new > old && 93 (new - base) > (unsigned) td->td_proc->p_rlimit[RLIMIT_DATA].rlim_cur) { 94 error = ENOMEM; 95 goto done; 96 } 97 if (new >= VM_MAXUSER_ADDRESS) { 98 error = ENOMEM; 99 goto done; 100 } 101 } else if (new < base) { 102 /* 103 * This is simply an invalid value. If someone wants to 104 * do fancy address space manipulations, mmap and munmap 105 * can do most of what the user would want. 106 */ 107 error = EINVAL; 108 goto done; 109 } 110 111 if (new > old) { 112 vm_size_t diff; 113 114 diff = new - old; 115 rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE, 116 VM_PROT_ALL, VM_PROT_ALL, 0); 117 if (rv != KERN_SUCCESS) { 118 error = ENOMEM; 119 goto done; 120 } 121 vm->vm_dsize += btoc(diff); 122 } else if (new < old) { 123 rv = vm_map_remove(&vm->vm_map, new, old); 124 if (rv != KERN_SUCCESS) { 125 error = ENOMEM; 126 goto done; 127 } 128 vm->vm_dsize -= btoc(old - new); 129 } 130 done: 131 mtx_unlock(&Giant); 132 return (error); 133 } 134 135 #ifndef _SYS_SYSPROTO_H_ 136 struct ovadvise_args { 137 int anom; 138 }; 139 #endif 140 141 /* 142 * MPSAFE 143 */ 144 /* ARGSUSED */ 145 int 146 ovadvise(td, uap) 147 struct thread *td; 148 struct ovadvise_args *uap; 149 { 150 /* START_GIANT_OPTIONAL */ 151 /* END_GIANT_OPTIONAL */ 152 return (EINVAL); 153 } 154