2005-01-07 02:29:27 +00:00
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/*-
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2017-11-20 19:43:44 +00:00
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* SPDX-License-Identifier: BSD-3-Clause
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*
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1994-05-24 10:09:53 +00:00
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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2017-02-28 23:42:47 +00:00
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* 3. Neither the name of the University nor the names of its contributors
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1994-05-24 10:09:53 +00:00
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
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*
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* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
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*/
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/*
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* Traditional sbrk/grow interface to VM
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*/
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2001-05-24 18:04:29 +00:00
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2003-06-11 23:50:51 +00:00
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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1994-05-24 10:09:53 +00:00
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#include <sys/param.h>
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2001-05-01 08:13:21 +00:00
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#include <sys/lock.h>
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2001-05-22 07:21:46 +00:00
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#include <sys/mutex.h>
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1994-05-24 10:09:53 +00:00
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#include <sys/proc.h>
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2011-04-05 20:23:59 +00:00
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#include <sys/racct.h>
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1994-05-24 10:09:53 +00:00
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#include <sys/resourcevar.h>
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2011-10-13 16:20:10 +00:00
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#include <sys/sysent.h>
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2001-05-22 07:21:46 +00:00
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#include <sys/sysproto.h>
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2001-05-19 01:28:09 +00:00
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#include <sys/systm.h>
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1994-05-24 10:09:53 +00:00
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#include <vm/vm.h>
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1995-12-07 12:48:31 +00:00
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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1994-05-25 09:21:21 +00:00
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1995-11-12 06:43:28 +00:00
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#ifndef _SYS_SYSPROTO_H_
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2018-06-14 21:27:25 +00:00
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struct break_args {
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1995-11-11 06:40:35 +00:00
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char *nsize;
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1994-05-24 10:09:53 +00:00
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};
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1995-11-12 06:43:28 +00:00
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#endif
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1994-05-24 10:09:53 +00:00
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int
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2018-06-14 21:27:25 +00:00
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sys_break(struct thread *td, struct break_args *uap)
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1994-05-24 10:09:53 +00:00
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{
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2018-05-24 17:04:27 +00:00
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#if !defined(__aarch64__) && !defined(__riscv__)
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2001-09-12 08:38:13 +00:00
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struct vmspace *vm = td->td_proc->p_vmspace;
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2013-01-11 09:58:35 +00:00
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vm_map_t map = &vm->vm_map;
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1996-06-25 00:36:46 +00:00
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vm_offset_t new, old, base;
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2012-12-18 07:35:01 +00:00
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rlim_t datalim, lmemlim, vmemlim;
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2011-10-13 16:20:10 +00:00
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int prot, rv;
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2001-07-04 16:20:28 +00:00
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int error = 0;
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2003-08-11 07:14:08 +00:00
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boolean_t do_map_wirefuture;
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2001-07-04 16:20:28 +00:00
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2015-06-10 10:48:12 +00:00
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datalim = lim_cur(td, RLIMIT_DATA);
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lmemlim = lim_cur(td, RLIMIT_MEMLOCK);
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vmemlim = lim_cur(td, RLIMIT_VMEM);
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2004-02-04 21:52:57 +00:00
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2003-08-11 07:14:08 +00:00
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do_map_wirefuture = FALSE;
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2002-06-20 02:04:55 +00:00
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new = round_page((vm_offset_t)uap->nsize);
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2013-01-11 09:58:35 +00:00
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vm_map_lock(map);
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1994-05-24 10:09:53 +00:00
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1996-06-25 00:36:46 +00:00
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base = round_page((vm_offset_t) vm->vm_daddr);
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2000-10-06 13:03:50 +00:00
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old = base + ctob(vm->vm_dsize);
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1996-06-25 00:36:46 +00:00
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if (new > base) {
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2000-10-06 13:03:50 +00:00
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/*
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2002-06-20 18:38:28 +00:00
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* Check the resource limit, but allow a process to reduce
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* its usage, even if it remains over the limit.
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2000-10-06 13:03:50 +00:00
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*/
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2004-02-04 21:52:57 +00:00
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if (new - base > datalim && new > old) {
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2001-07-04 16:20:28 +00:00
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error = ENOMEM;
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goto done;
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}
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2013-01-11 09:58:35 +00:00
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if (new > vm_map_max(map)) {
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2001-07-04 16:20:28 +00:00
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error = ENOMEM;
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goto done;
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}
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1996-06-25 00:36:46 +00:00
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} else if (new < base) {
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/*
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2018-06-04 19:35:15 +00:00
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* Simply return the current break address without
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* modifying any state. This is an ad-hoc interface
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* used by libc to determine the initial break address,
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* avoiding a dependency on magic features in the system
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* linker.
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1996-06-25 00:36:46 +00:00
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*/
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2018-06-04 19:35:15 +00:00
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new = old;
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2001-07-04 16:20:28 +00:00
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goto done;
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1996-06-25 00:36:46 +00:00
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}
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2018-06-04 19:35:15 +00:00
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1996-06-25 00:36:46 +00:00
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if (new > old) {
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2013-01-11 09:58:35 +00:00
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if (!old_mlock && map->flags & MAP_WIREFUTURE) {
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if (ptoa(pmap_wired_count(map->pmap)) +
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2012-12-18 07:35:01 +00:00
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(new - old) > lmemlim) {
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error = ENOMEM;
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goto done;
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}
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}
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2013-01-11 09:58:35 +00:00
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if (map->size + (new - old) > vmemlim) {
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2002-06-26 00:29:28 +00:00
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error = ENOMEM;
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goto done;
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}
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2011-07-06 20:06:44 +00:00
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#ifdef RACCT
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2015-04-29 10:23:02 +00:00
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if (racct_enable) {
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PROC_LOCK(td->td_proc);
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error = racct_set(td->td_proc, RACCT_DATA, new - base);
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if (error != 0) {
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PROC_UNLOCK(td->td_proc);
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error = ENOMEM;
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goto done;
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}
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error = racct_set(td->td_proc, RACCT_VMEM,
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map->size + (new - old));
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2012-12-18 07:35:01 +00:00
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if (error != 0) {
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racct_set_force(td->td_proc, RACCT_DATA,
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old - base);
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PROC_UNLOCK(td->td_proc);
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error = ENOMEM;
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goto done;
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}
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2015-04-29 10:23:02 +00:00
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if (!old_mlock && map->flags & MAP_WIREFUTURE) {
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error = racct_set(td->td_proc, RACCT_MEMLOCK,
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ptoa(pmap_wired_count(map->pmap)) +
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(new - old));
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if (error != 0) {
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racct_set_force(td->td_proc, RACCT_DATA,
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old - base);
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racct_set_force(td->td_proc, RACCT_VMEM,
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map->size);
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PROC_UNLOCK(td->td_proc);
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error = ENOMEM;
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goto done;
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}
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}
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PROC_UNLOCK(td->td_proc);
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2012-12-18 07:35:01 +00:00
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}
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2011-10-13 16:20:10 +00:00
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#endif
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prot = VM_PROT_RW;
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#ifdef COMPAT_FREEBSD32
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2014-07-07 00:27:09 +00:00
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#if defined(__amd64__)
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2011-10-15 12:35:18 +00:00
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if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
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2011-10-13 16:20:10 +00:00
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prot |= VM_PROT_EXECUTE;
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#endif
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2011-07-06 20:06:44 +00:00
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#endif
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2013-01-11 09:58:35 +00:00
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rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL, 0);
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1994-05-24 10:09:53 +00:00
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if (rv != KERN_SUCCESS) {
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2011-07-06 20:06:44 +00:00
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#ifdef RACCT
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2015-04-29 10:23:02 +00:00
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if (racct_enable) {
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PROC_LOCK(td->td_proc);
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racct_set_force(td->td_proc,
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RACCT_DATA, old - base);
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racct_set_force(td->td_proc,
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RACCT_VMEM, map->size);
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if (!old_mlock && map->flags & MAP_WIREFUTURE) {
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racct_set_force(td->td_proc,
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RACCT_MEMLOCK,
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ptoa(pmap_wired_count(map->pmap)));
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}
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PROC_UNLOCK(td->td_proc);
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2012-12-18 07:35:01 +00:00
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}
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2011-07-06 20:06:44 +00:00
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#endif
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2001-07-04 16:20:28 +00:00
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error = ENOMEM;
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goto done;
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1994-05-24 10:09:53 +00:00
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}
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2002-06-20 02:04:55 +00:00
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vm->vm_dsize += btoc(new - old);
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2003-08-11 07:14:08 +00:00
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/*
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* Handle the MAP_WIREFUTURE case for legacy applications,
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* by marking the newly mapped range of pages as wired.
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* We are not required to perform a corresponding
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* vm_map_unwire() before vm_map_delete() below, as
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* it will forcibly unwire the pages in the range.
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*
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* XXX If the pages cannot be wired, no error is returned.
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*/
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2018-06-14 21:27:25 +00:00
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if ((map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE)
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2003-08-11 07:14:08 +00:00
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do_map_wirefuture = TRUE;
|
1996-06-25 00:36:46 +00:00
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} else if (new < old) {
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2013-01-11 09:58:35 +00:00
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rv = vm_map_delete(map, new, old);
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1994-05-24 10:09:53 +00:00
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if (rv != KERN_SUCCESS) {
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2001-07-04 16:20:28 +00:00
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error = ENOMEM;
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goto done;
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1994-05-24 10:09:53 +00:00
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}
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1996-06-25 00:36:46 +00:00
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vm->vm_dsize -= btoc(old - new);
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2011-07-06 20:06:44 +00:00
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#ifdef RACCT
|
2015-04-29 10:23:02 +00:00
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if (racct_enable) {
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PROC_LOCK(td->td_proc);
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racct_set_force(td->td_proc, RACCT_DATA, new - base);
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racct_set_force(td->td_proc, RACCT_VMEM, map->size);
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if (!old_mlock && map->flags & MAP_WIREFUTURE) {
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racct_set_force(td->td_proc, RACCT_MEMLOCK,
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ptoa(pmap_wired_count(map->pmap)));
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}
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PROC_UNLOCK(td->td_proc);
|
2012-12-18 07:35:01 +00:00
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}
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2011-07-06 20:06:44 +00:00
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#endif
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1994-05-24 10:09:53 +00:00
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}
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2001-07-04 16:20:28 +00:00
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done:
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2013-01-11 09:58:35 +00:00
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vm_map_unlock(map);
|
2003-08-11 07:14:08 +00:00
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if (do_map_wirefuture)
|
2013-01-11 09:58:35 +00:00
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(void) vm_map_wire(map, old, new,
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2003-08-11 07:14:08 +00:00
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VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
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|
2018-06-04 19:35:15 +00:00
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if (error == 0)
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td->td_retval[0] = new;
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2001-07-04 16:20:28 +00:00
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return (error);
|
2018-05-24 17:04:27 +00:00
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#else /* defined(__aarch64__) || defined(__riscv__) */
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return (ENOSYS);
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#endif /* defined(__aarch64__) || defined(__riscv__) */
|
1994-05-24 10:09:53 +00:00
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}
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|
2018-05-25 20:40:23 +00:00
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#ifdef COMPAT_FREEBSD11
|
1994-05-24 10:09:53 +00:00
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int
|
2018-05-25 20:40:23 +00:00
|
|
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freebsd11_vadvise(struct thread *td, struct freebsd11_vadvise_args *uap)
|
1994-05-24 10:09:53 +00:00
|
|
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{
|
2018-05-25 20:40:23 +00:00
|
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|
1994-05-24 10:09:53 +00:00
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return (EINVAL);
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|
|
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}
|
2018-05-25 20:40:23 +00:00
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#endif
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