vm_unix.c revision 82697
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1988 University of Utah. 31541Srgrimes * Copyright (c) 1991, 1993 41541Srgrimes * The Regents of the University of California. All rights reserved. 51541Srgrimes * 61541Srgrimes * This code is derived from software contributed to Berkeley by 71541Srgrimes * the Systems Programming Group of the University of Utah Computer 81541Srgrimes * Science Department. 91541Srgrimes * 101541Srgrimes * Redistribution and use in source and binary forms, with or without 111541Srgrimes * modification, are permitted provided that the following conditions 121541Srgrimes * are met: 131541Srgrimes * 1. Redistributions of source code must retain the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer. 151541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer in the 171541Srgrimes * documentation and/or other materials provided with the distribution. 181541Srgrimes * 3. All advertising materials mentioning features or use of this software 1958705Scharnier * must display the following acknowledgement: 201541Srgrimes * This product includes software developed by the University of 211541Srgrimes * California, Berkeley and its contributors. 221541Srgrimes * 4. Neither the name of the University nor the names of its contributors 231541Srgrimes * may be used to endorse or promote products derived from this software 241541Srgrimes * without specific prior written permission. 251541Srgrimes * 261541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 271541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 281541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 291541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 301541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 311541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 321541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 331541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 341541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 351541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 361541Srgrimes * SUCH DAMAGE. 371541Srgrimes * 381541Srgrimes * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 391541Srgrimes * 401541Srgrimes * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 4150477Speter * $FreeBSD: head/sys/vm/vm_unix.c 82697 2001-08-31 22:10:03Z dillon $ 421541Srgrimes */ 431541Srgrimes 441541Srgrimes/* 451541Srgrimes * Traditional sbrk/grow interface to VM 461541Srgrimes */ 4777139Sjhb#include "opt_bleed.h" 4877139Sjhb 491541Srgrimes#include <sys/param.h> 5076166Smarkm#include <sys/lock.h> 5176981Sjhb#include <sys/mutex.h> 521541Srgrimes#include <sys/proc.h> 531541Srgrimes#include <sys/resourcevar.h> 5476981Sjhb#include <sys/sysproto.h> 5576827Salfred#include <sys/systm.h> 561541Srgrimes 571541Srgrimes#include <vm/vm.h> 5812662Sdg#include <vm/vm_param.h> 5912662Sdg#include <vm/pmap.h> 6012662Sdg#include <vm/vm_map.h> 611541Srgrimes 6212221Sbde#ifndef _SYS_SYSPROTO_H_ 631541Srgrimesstruct obreak_args { 6412206Sbde char *nsize; 651541Srgrimes}; 6612221Sbde#endif 671549Srgrimes 6882697Sdillon/* 6982697Sdillon * MPSAFE 7082697Sdillon */ 711541Srgrimes/* ARGSUSED */ 721541Srgrimesint 7330994Sphkobreak(p, uap) 741541Srgrimes struct proc *p; 751541Srgrimes struct obreak_args *uap; 761541Srgrimes{ 7779242Sdillon struct vmspace *vm = p->p_vmspace; 7816679Sdyson vm_offset_t new, old, base; 791541Srgrimes int rv; 8079224Sdillon int error = 0; 811541Srgrimes 8279224Sdillon mtx_lock(&Giant); /* syscall marked mp-safe but isn't */ 8379224Sdillon 8416679Sdyson base = round_page((vm_offset_t) vm->vm_daddr); 8540286Sdg new = round_page((vm_offset_t)uap->nsize); 8666748Sdwmalone old = base + ctob(vm->vm_dsize); 8716679Sdyson if (new > base) { 8866748Sdwmalone /* 8966748Sdwmalone * We check resource limits here, but alow processes to 9066748Sdwmalone * reduce their usage, even if they remain over the limit. 9166748Sdwmalone */ 9266748Sdwmalone if (new > old && 9379224Sdillon (new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur) { 9479224Sdillon error = ENOMEM; 9579224Sdillon goto done; 9679224Sdillon } 9779224Sdillon if (new >= VM_MAXUSER_ADDRESS) { 9879224Sdillon error = ENOMEM; 9979224Sdillon goto done; 10079224Sdillon } 10116679Sdyson } else if (new < base) { 10216679Sdyson /* 10316679Sdyson * This is simply an invalid value. If someone wants to 10416679Sdyson * do fancy address space manipulations, mmap and munmap 10516679Sdyson * can do most of what the user would want. 10616679Sdyson */ 10779224Sdillon error = EINVAL; 10879224Sdillon goto done; 10916679Sdyson } 11016679Sdyson 11116679Sdyson if (new > old) { 11216679Sdyson vm_size_t diff; 11344206Sdillon 11416679Sdyson diff = new - old; 11513490Sdyson rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE, 11643751Sdillon VM_PROT_ALL, VM_PROT_ALL, 0); 1171541Srgrimes if (rv != KERN_SUCCESS) { 11879224Sdillon error = ENOMEM; 11979224Sdillon goto done; 1201541Srgrimes } 1211541Srgrimes vm->vm_dsize += btoc(diff); 12216679Sdyson } else if (new < old) { 12316679Sdyson rv = vm_map_remove(&vm->vm_map, new, old); 1241541Srgrimes if (rv != KERN_SUCCESS) { 12579224Sdillon error = ENOMEM; 12679224Sdillon goto done; 1271541Srgrimes } 12816679Sdyson vm->vm_dsize -= btoc(old - new); 1291541Srgrimes } 13079224Sdillondone: 13179224Sdillon mtx_unlock(&Giant); 13279224Sdillon return (error); 1331541Srgrimes} 1341541Srgrimes 13512221Sbde#ifndef _SYS_SYSPROTO_H_ 1361541Srgrimesstruct ovadvise_args { 1375455Sdg int anom; 1381541Srgrimes}; 13912221Sbde#endif 1401549Srgrimes 14182697Sdillon/* 14282697Sdillon * MPSAFE 14382697Sdillon */ 1441541Srgrimes/* ARGSUSED */ 1451541Srgrimesint 14630994Sphkovadvise(p, uap) 1471541Srgrimes struct proc *p; 1481541Srgrimes struct ovadvise_args *uap; 1491541Srgrimes{ 15079224Sdillon /* START_GIANT_OPTIONAL */ 15179224Sdillon /* END_GIANT_OPTIONAL */ 1521541Srgrimes return (EINVAL); 1531541Srgrimes} 154