vm_unix.c revision 244384
11844Swollman/*- 227910Sasami * Copyright (c) 1988 University of Utah. 31638Srgrimes * Copyright (c) 1991, 1993 41844Swollman * The Regents of the University of California. All rights reserved. 51638Srgrimes * 61638Srgrimes * This code is derived from software contributed to Berkeley by 71638Srgrimes * the Systems Programming Group of the University of Utah Computer 81844Swollman * Science Department. 91638Srgrimes * 102827Sjkh * Redistribution and use in source and binary forms, with or without 111844Swollman * modification, are permitted provided that the following conditions 121844Swollman * are met: 1326051Sasami * 1. Redistributions of source code must retain the above copyright 141844Swollman * notice, this list of conditions and the following disclaimer. 151638Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 162827Sjkh * notice, this list of conditions and the following disclaimer in the 171638Srgrimes * documentation and/or other materials provided with the distribution. 182827Sjkh * 4. Neither the name of the University nor the names of its contributors 191638Srgrimes * may be used to endorse or promote products derived from this software 2027028Spst * without specific prior written permission. 211844Swollman * 221844Swollman * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231638Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241638Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251638Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261638Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271844Swollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281844Swollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291638Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3024750Sbde * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311844Swollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321844Swollman * SUCH DAMAGE. 338321Sbde * 341844Swollman * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 352351Sbde * 361638Srgrimes * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 372351Sbde */ 382351Sbde 392351Sbde#include "opt_compat.h" 402351Sbde 412351Sbde/* 422351Sbde * Traditional sbrk/grow interface to VM 4324750Sbde */ 442351Sbde 451638Srgrimes#include <sys/cdefs.h> 461638Srgrimes__FBSDID("$FreeBSD: head/sys/vm/vm_unix.c 244384 2012-12-18 07:35:01Z zont $"); 471638Srgrimes 481638Srgrimes#include <sys/param.h> 491638Srgrimes#include <sys/lock.h> 501638Srgrimes#include <sys/mutex.h> 511844Swollman#include <sys/proc.h> 521638Srgrimes#include <sys/racct.h> 531638Srgrimes#include <sys/resourcevar.h> 541638Srgrimes#include <sys/sysent.h> 551638Srgrimes#include <sys/sysproto.h> 5618340Sswallace#include <sys/systm.h> 571638Srgrimes 581638Srgrimes#include <vm/vm.h> 5916663Sjkh#include <vm/vm_param.h> 6014444Swosch#include <vm/pmap.h> 6116826Sphk#include <vm/vm_map.h> 6216437Sphk 631638Srgrimes#ifndef _SYS_SYSPROTO_H_ 6416437Sphkstruct obreak_args { 651638Srgrimes char *nsize; 6627910Sasami}; 6724750Sbde#endif 6824750Sbde 6925110Sbde/* 7024750Sbde * MPSAFE 7124750Sbde */ 721638Srgrimes/* ARGSUSED */ 731638Srgrimesint 741638Srgrimessys_obreak(td, uap) 751638Srgrimes struct thread *td; 761638Srgrimes struct obreak_args *uap; 7716663Sjkh{ 781638Srgrimes struct vmspace *vm = td->td_proc->p_vmspace; 791844Swollman vm_offset_t new, old, base; 801996Swollman rlim_t datalim, lmemlim, vmemlim; 811638Srgrimes int prot, rv; 821638Srgrimes int error = 0; 831638Srgrimes boolean_t do_map_wirefuture; 8423542Sbde 851638Srgrimes PROC_LOCK(td->td_proc); 861638Srgrimes datalim = lim_cur(td->td_proc, RLIMIT_DATA); 871638Srgrimes lmemlim = lim_cur(td->td_proc, RLIMIT_MEMLOCK); 881638Srgrimes vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM); 891638Srgrimes PROC_UNLOCK(td->td_proc); 901638Srgrimes 911638Srgrimes do_map_wirefuture = FALSE; 921638Srgrimes new = round_page((vm_offset_t)uap->nsize); 932351Sbde vm_map_lock(&vm->vm_map); 941638Srgrimes 956031Sjkh base = round_page((vm_offset_t) vm->vm_daddr); 961638Srgrimes old = base + ctob(vm->vm_dsize); 971638Srgrimes if (new > base) { 981638Srgrimes /* 9916663Sjkh * Check the resource limit, but allow a process to reduce 1001844Swollman * its usage, even if it remains over the limit. 1011844Swollman */ 1021844Swollman if (new - base > datalim && new > old) { 1031638Srgrimes error = ENOMEM; 1041844Swollman goto done; 1051638Srgrimes } 1061638Srgrimes if (new > vm_map_max(&vm->vm_map)) { 1075585Sjkh error = ENOMEM; 1084442Sphk goto done; 10916663Sjkh } 11026760Sjkh } else if (new < base) { 11126760Sjkh /* 11226760Sjkh * This is simply an invalid value. If someone wants to 1134442Sphk * do fancy address space manipulations, mmap and munmap 1144442Sphk * can do most of what the user would want. 1151638Srgrimes */ 11616663Sjkh error = EINVAL; 1171638Srgrimes goto done; 1181638Srgrimes } 1191638Srgrimes if (new > old) { 1201638Srgrimes if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) { 1211638Srgrimes if (ptoa(vmspace_wired_count(td->td_proc->p_vmspace)) + 12224861Sjkh (new - old) > lmemlim) { 12324861Sjkh error = ENOMEM; 12424861Sjkh goto done; 12524861Sjkh } 1261638Srgrimes } 12716663Sjkh if (vm->vm_map.size + (new - old) > vmemlim) { 1281638Srgrimes error = ENOMEM; 12924861Sjkh goto done; 13024861Sjkh } 13124861Sjkh#ifdef RACCT 1321638Srgrimes PROC_LOCK(td->td_proc); 1331638Srgrimes error = racct_set(td->td_proc, RACCT_DATA, new - base); 13424861Sjkh if (error != 0) { 1351638Srgrimes PROC_UNLOCK(td->td_proc); 1361638Srgrimes error = ENOMEM; 1371638Srgrimes goto done; 1381844Swollman } 1391638Srgrimes error = racct_set(td->td_proc, RACCT_VMEM, 14011136Swollman vm->vm_map.size + (new - old)); 1411638Srgrimes if (error != 0) { 1421844Swollman racct_set_force(td->td_proc, RACCT_DATA, old - base); 1431844Swollman PROC_UNLOCK(td->td_proc); 14416663Sjkh error = ENOMEM; 145 goto done; 146 } 147 if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) { 148 error = racct_set(td->td_proc, RACCT_MEMLOCK, 149 ptoa(vmspace_wired_count(td->td_proc->p_vmspace)) + 150 (new - old)); 151 if (error != 0) { 152 racct_set_force(td->td_proc, RACCT_DATA, 153 old - base); 154 racct_set_force(td->td_proc, RACCT_VMEM, 155 vm->vm_map.size); 156 PROC_UNLOCK(td->td_proc); 157 error = ENOMEM; 158 goto done; 159 } 160 } 161 PROC_UNLOCK(td->td_proc); 162#endif 163 prot = VM_PROT_RW; 164#ifdef COMPAT_FREEBSD32 165#if defined(__amd64__) || defined(__ia64__) 166 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32)) 167 prot |= VM_PROT_EXECUTE; 168#endif 169#endif 170 rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new, 171 prot, VM_PROT_ALL, 0); 172 if (rv != KERN_SUCCESS) { 173#ifdef RACCT 174 PROC_LOCK(td->td_proc); 175 racct_set_force(td->td_proc, RACCT_DATA, old - base); 176 racct_set_force(td->td_proc, RACCT_VMEM, vm->vm_map.size); 177 if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) { 178 racct_set_force(td->td_proc, RACCT_MEMLOCK, 179 ptoa(vmspace_wired_count( 180 td->td_proc->p_vmspace))); 181 } 182 PROC_UNLOCK(td->td_proc); 183#endif 184 error = ENOMEM; 185 goto done; 186 } 187 vm->vm_dsize += btoc(new - old); 188 /* 189 * Handle the MAP_WIREFUTURE case for legacy applications, 190 * by marking the newly mapped range of pages as wired. 191 * We are not required to perform a corresponding 192 * vm_map_unwire() before vm_map_delete() below, as 193 * it will forcibly unwire the pages in the range. 194 * 195 * XXX If the pages cannot be wired, no error is returned. 196 */ 197 if ((vm->vm_map.flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) { 198 if (bootverbose) 199 printf("obreak: MAP_WIREFUTURE set\n"); 200 do_map_wirefuture = TRUE; 201 } 202 } else if (new < old) { 203 rv = vm_map_delete(&vm->vm_map, new, old); 204 if (rv != KERN_SUCCESS) { 205 error = ENOMEM; 206 goto done; 207 } 208 vm->vm_dsize -= btoc(old - new); 209#ifdef RACCT 210 PROC_LOCK(td->td_proc); 211 racct_set_force(td->td_proc, RACCT_DATA, new - base); 212 racct_set_force(td->td_proc, RACCT_VMEM, vm->vm_map.size); 213 if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) { 214 racct_set_force(td->td_proc, RACCT_MEMLOCK, 215 ptoa(vmspace_wired_count(td->td_proc->p_vmspace))); 216 } 217 PROC_UNLOCK(td->td_proc); 218#endif 219 } 220done: 221 vm_map_unlock(&vm->vm_map); 222 223 if (do_map_wirefuture) 224 (void) vm_map_wire(&vm->vm_map, old, new, 225 VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES); 226 227 return (error); 228} 229 230#ifndef _SYS_SYSPROTO_H_ 231struct ovadvise_args { 232 int anom; 233}; 234#endif 235 236/* 237 * MPSAFE 238 */ 239/* ARGSUSED */ 240int 241sys_ovadvise(td, uap) 242 struct thread *td; 243 struct ovadvise_args *uap; 244{ 245 /* START_GIANT_OPTIONAL */ 246 /* END_GIANT_OPTIONAL */ 247 return (EINVAL); 248} 249