vm_unix.c revision 76827
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 76827 2001-05-19 01:28:09Z alfred $ 421541Srgrimes */ 431541Srgrimes 441541Srgrimes/* 451541Srgrimes * Traditional sbrk/grow interface to VM 461541Srgrimes */ 471541Srgrimes#include <sys/param.h> 4876166Smarkm#include <sys/lock.h> 4912221Sbde#include <sys/sysproto.h> 501541Srgrimes#include <sys/proc.h> 511541Srgrimes#include <sys/resourcevar.h> 5276827Salfred#include <sys/lock.h> 5376827Salfred#include <sys/mutex.h> 5476827Salfred#include <sys/systm.h> 551541Srgrimes 561541Srgrimes#include <vm/vm.h> 5712662Sdg#include <vm/vm_param.h> 5812662Sdg#include <vm/pmap.h> 5912662Sdg#include <vm/vm_map.h> 601541Srgrimes 6112221Sbde#ifndef _SYS_SYSPROTO_H_ 621541Srgrimesstruct obreak_args { 6312206Sbde char *nsize; 641541Srgrimes}; 6512221Sbde#endif 661549Srgrimes 671541Srgrimes/* ARGSUSED */ 681541Srgrimesint 6930994Sphkobreak(p, uap) 701541Srgrimes struct proc *p; 711541Srgrimes struct obreak_args *uap; 721541Srgrimes{ 731541Srgrimes register struct vmspace *vm = p->p_vmspace; 7416679Sdyson vm_offset_t new, old, base; 751541Srgrimes int rv; 761541Srgrimes 7716679Sdyson base = round_page((vm_offset_t) vm->vm_daddr); 7840286Sdg new = round_page((vm_offset_t)uap->nsize); 7966748Sdwmalone old = base + ctob(vm->vm_dsize); 8016679Sdyson if (new > base) { 8166748Sdwmalone /* 8266748Sdwmalone * We check resource limits here, but alow processes to 8366748Sdwmalone * reduce their usage, even if they remain over the limit. 8466748Sdwmalone */ 8566748Sdwmalone if (new > old && 8666748Sdwmalone (new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur) 8716679Sdyson return ENOMEM; 8816679Sdyson if (new >= VM_MAXUSER_ADDRESS) 8916679Sdyson return (ENOMEM); 9016679Sdyson } else if (new < base) { 9116679Sdyson /* 9216679Sdyson * This is simply an invalid value. If someone wants to 9316679Sdyson * do fancy address space manipulations, mmap and munmap 9416679Sdyson * can do most of what the user would want. 9516679Sdyson */ 9616679Sdyson return EINVAL; 9716679Sdyson } 9816679Sdyson 9976827Salfred mtx_lock(&vm_mtx); 10016679Sdyson if (new > old) { 10116679Sdyson vm_size_t diff; 10244206Sdillon 10316679Sdyson diff = new - old; 10413490Sdyson rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE, 10543751Sdillon VM_PROT_ALL, VM_PROT_ALL, 0); 1061541Srgrimes if (rv != KERN_SUCCESS) { 10776827Salfred mtx_unlock(&vm_mtx); 1085455Sdg return (ENOMEM); 1091541Srgrimes } 1101541Srgrimes vm->vm_dsize += btoc(diff); 11116679Sdyson } else if (new < old) { 11216679Sdyson rv = vm_map_remove(&vm->vm_map, new, old); 1131541Srgrimes if (rv != KERN_SUCCESS) { 11476827Salfred mtx_unlock(&vm_mtx); 1155455Sdg return (ENOMEM); 1161541Srgrimes } 11716679Sdyson vm->vm_dsize -= btoc(old - new); 1181541Srgrimes } 11976827Salfred mtx_unlock(&vm_mtx); 1205455Sdg return (0); 1211541Srgrimes} 1221541Srgrimes 12312221Sbde#ifndef _SYS_SYSPROTO_H_ 1241541Srgrimesstruct ovadvise_args { 1255455Sdg int anom; 1261541Srgrimes}; 12712221Sbde#endif 1281549Srgrimes 1291541Srgrimes/* ARGSUSED */ 1301541Srgrimesint 13130994Sphkovadvise(p, uap) 1321541Srgrimes struct proc *p; 1331541Srgrimes struct ovadvise_args *uap; 1341541Srgrimes{ 1351541Srgrimes 1361541Srgrimes return (EINVAL); 1371541Srgrimes} 138