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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 35 * 36 * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 37 */ 38 39 /* 40 * Traditional sbrk/grow interface to VM 41 */ 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/param.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/proc.h> 50 #include <sys/resourcevar.h> 51 #include <sys/sysproto.h> 52 #include <sys/systm.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_param.h> 56 #include <vm/pmap.h> 57 #include <vm/vm_map.h> 58 59 #ifndef _SYS_SYSPROTO_H_ 60 struct obreak_args { 61 char *nsize; 62 }; 63 #endif 64 65 /* 66 * MPSAFE 67 */ 68 /* ARGSUSED */ 69 int 70 obreak(td, uap) 71 struct thread *td; 72 struct obreak_args *uap; 73 { 74 struct vmspace *vm = td->td_proc->p_vmspace; 75 vm_offset_t new, old, base; 76 rlim_t datalim, vmemlim; 77 int rv; 78 int error = 0; 79 boolean_t do_map_wirefuture; 80 81 PROC_LOCK(td->td_proc); 82 datalim = lim_cur(td->td_proc, RLIMIT_DATA); 83 vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM); 84 PROC_UNLOCK(td->td_proc); 85 86 do_map_wirefuture = FALSE; 87 new = round_page((vm_offset_t)uap->nsize); 88 vm_map_lock(&vm->vm_map); 89 90 base = round_page((vm_offset_t) vm->vm_daddr); 91 old = base + ctob(vm->vm_dsize); 92 if (new > base) { 93 /* 94 * Check the resource limit, but allow a process to reduce 95 * its usage, even if it remains over the limit. 96 */ 97 if (new - base > datalim && new > old) { 98 error = ENOMEM; 99 goto done; 100 } 101 if (new > vm_map_max(&vm->vm_map)) { 102 error = ENOMEM; 103 goto done; 104 } 105 } else if (new < base) { 106 /* 107 * This is simply an invalid value. If someone wants to 108 * do fancy address space manipulations, mmap and munmap 109 * can do most of what the user would want. 110 */ 111 error = EINVAL; 112 goto done; 113 } 114 if (new > old) { 115 if (vm->vm_map.size + (new - old) > vmemlim) { 116 error = ENOMEM; 117 goto done; 118 } 119 rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new, 120 VM_PROT_RW, VM_PROT_ALL, 0); 121 if (rv != KERN_SUCCESS) { 122 error = ENOMEM; 123 goto done; 124 } 125 vm->vm_dsize += btoc(new - old); 126 /* 127 * Handle the MAP_WIREFUTURE case for legacy applications, 128 * by marking the newly mapped range of pages as wired. 129 * We are not required to perform a corresponding 130 * vm_map_unwire() before vm_map_delete() below, as 131 * it will forcibly unwire the pages in the range. 132 * 133 * XXX If the pages cannot be wired, no error is returned. 134 */ 135 if ((vm->vm_map.flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) { 136 if (bootverbose) 137 printf("obreak: MAP_WIREFUTURE set\n"); 138 do_map_wirefuture = TRUE; 139 } 140 } else if (new < old) { 141 rv = vm_map_delete(&vm->vm_map, new, old); 142 if (rv != KERN_SUCCESS) { 143 error = ENOMEM; 144 goto done; 145 } 146 vm->vm_dsize -= btoc(old - new); 147 } 148 done: 149 vm_map_unlock(&vm->vm_map); 150 151 if (do_map_wirefuture) 152 (void) vm_map_wire(&vm->vm_map, old, new, 153 VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES); 154 155 return (error); 156 } 157 158 #ifndef _SYS_SYSPROTO_H_ 159 struct ovadvise_args { 160 int anom; 161 }; 162 #endif 163 164 /* 165 * MPSAFE 166 */ 167 /* ARGSUSED */ 168 int 169 ovadvise(td, uap) 170 struct thread *td; 171 struct ovadvise_args *uap; 172 { 173 /* START_GIANT_OPTIONAL */ 174 /* END_GIANT_OPTIONAL */ 175 return (EINVAL); 176 } 177