1153 lines
26 KiB
C
1153 lines
26 KiB
C
/*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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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 $Hdr: vm_mmap.c 1.6 91/10/21$
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*
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* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
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* $FreeBSD$
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*/
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/*
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* Mapped file (mmap) interface to VM
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*/
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#include "opt_compat.h"
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#include "opt_rlimit.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/filedesc.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/mman.h>
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#include <sys/conf.h>
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#include <sys/stat.h>
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#include <sys/vmmeter.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#ifndef _SYS_SYSPROTO_H_
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struct sbrk_args {
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int incr;
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};
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#endif
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static int max_proc_mmap;
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SYSCTL_INT(_vm, OID_AUTO, max_proc_mmap, CTLFLAG_RW, &max_proc_mmap, 0, "");
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/*
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* Set the maximum number of vm_map_entry structures per process. Roughly
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* speaking vm_map_entry structures are tiny, so allowing them to eat 1/100
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* of our KVM malloc space still results in generous limits. We want a
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* default that is good enough to prevent the kernel running out of resources
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* if attacked from compromised user account but generous enough such that
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* multi-threaded processes are not unduly inconvenienced.
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*/
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static void vmmapentry_rsrc_init __P((void *));
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SYSINIT(vmmersrc, SI_SUB_KVM_RSRC, SI_ORDER_FIRST, vmmapentry_rsrc_init, NULL)
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static void
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vmmapentry_rsrc_init(dummy)
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void *dummy;
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{
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max_proc_mmap = vm_kmem_size / sizeof(struct vm_map_entry);
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max_proc_mmap /= 100;
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}
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/* ARGSUSED */
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int
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sbrk(p, uap)
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struct proc *p;
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struct sbrk_args *uap;
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{
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/* Not yet implemented */
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return (EOPNOTSUPP);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct sstk_args {
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int incr;
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};
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#endif
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/* ARGSUSED */
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int
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sstk(p, uap)
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struct proc *p;
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struct sstk_args *uap;
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{
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/* Not yet implemented */
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return (EOPNOTSUPP);
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}
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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#ifndef _SYS_SYSPROTO_H_
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struct getpagesize_args {
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int dummy;
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};
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#endif
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/* ARGSUSED */
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int
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ogetpagesize(p, uap)
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struct proc *p;
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struct getpagesize_args *uap;
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{
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p->p_retval[0] = PAGE_SIZE;
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return (0);
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}
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#endif /* COMPAT_43 || COMPAT_SUNOS */
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/*
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* Memory Map (mmap) system call. Note that the file offset
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* and address are allowed to be NOT page aligned, though if
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* the MAP_FIXED flag it set, both must have the same remainder
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* modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
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* page-aligned, the actual mapping starts at trunc_page(addr)
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* and the return value is adjusted up by the page offset.
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*
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* Generally speaking, only character devices which are themselves
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* memory-based, such as a video framebuffer, can be mmap'd. Otherwise
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* there would be no cache coherency between a descriptor and a VM mapping
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* both to the same character device.
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*
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* Block devices can be mmap'd no matter what they represent. Cache coherency
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* is maintained as long as you do not write directly to the underlying
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* character device.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct mmap_args {
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void *addr;
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size_t len;
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int prot;
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int flags;
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int fd;
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long pad;
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off_t pos;
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};
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#endif
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int
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mmap(p, uap)
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struct proc *p;
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register struct mmap_args *uap;
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{
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register struct filedesc *fdp = p->p_fd;
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register struct file *fp;
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struct vnode *vp;
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vm_offset_t addr;
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vm_size_t size, pageoff;
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vm_prot_t prot, maxprot;
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void *handle;
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int flags, error;
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int disablexworkaround;
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off_t pos;
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struct vmspace *vms = p->p_vmspace;
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addr = (vm_offset_t) uap->addr;
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size = uap->len;
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prot = uap->prot & VM_PROT_ALL;
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flags = uap->flags;
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pos = uap->pos;
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/* make sure mapping fits into numeric range etc */
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if ((ssize_t) uap->len < 0 ||
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((flags & MAP_ANON) && uap->fd != -1))
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return (EINVAL);
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if (flags & MAP_STACK) {
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if ((uap->fd != -1) ||
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((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
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return (EINVAL);
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flags |= MAP_ANON;
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pos = 0;
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}
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/*
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* Align the file position to a page boundary,
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* and save its page offset component.
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*/
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pageoff = (pos & PAGE_MASK);
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pos -= pageoff;
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/* Adjust size for rounding (on both ends). */
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size += pageoff; /* low end... */
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size = (vm_size_t) round_page(size); /* hi end */
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/*
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* Check for illegal addresses. Watch out for address wrap... Note
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* that VM_*_ADDRESS are not constants due to casts (argh).
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*/
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if (flags & MAP_FIXED) {
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/*
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* The specified address must have the same remainder
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* as the file offset taken modulo PAGE_SIZE, so it
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* should be aligned after adjustment by pageoff.
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*/
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addr -= pageoff;
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if (addr & PAGE_MASK)
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return (EINVAL);
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/* Address range must be all in user VM space. */
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if (VM_MAXUSER_ADDRESS > 0 && addr + size > VM_MAXUSER_ADDRESS)
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return (EINVAL);
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#ifndef i386
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if (VM_MIN_ADDRESS > 0 && addr < VM_MIN_ADDRESS)
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return (EINVAL);
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#endif
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if (addr + size < addr)
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return (EINVAL);
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}
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/*
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* XXX for non-fixed mappings where no hint is provided or
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* the hint would fall in the potential heap space,
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* place it after the end of the largest possible heap.
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*
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* There should really be a pmap call to determine a reasonable
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* location.
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*/
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else if (addr == 0 ||
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(addr >= round_page((vm_offset_t)vms->vm_taddr) &&
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addr < round_page((vm_offset_t)vms->vm_daddr + MAXDSIZ)))
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addr = round_page((vm_offset_t)vms->vm_daddr + MAXDSIZ);
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if (flags & MAP_ANON) {
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/*
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* Mapping blank space is trivial.
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*/
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handle = NULL;
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maxprot = VM_PROT_ALL;
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pos = 0;
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} else {
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/*
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* Mapping file, get fp for validation. Obtain vnode and make
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* sure it is of appropriate type.
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*/
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if (((unsigned) uap->fd) >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[uap->fd]) == NULL)
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return (EBADF);
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if (fp->f_type != DTYPE_VNODE)
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return (EINVAL);
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vp = (struct vnode *) fp->f_data;
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if (vp->v_type != VREG && vp->v_type != VCHR)
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return (EINVAL);
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/*
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* XXX hack to handle use of /dev/zero to map anon memory (ala
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* SunOS).
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*/
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if (vp->v_type == VCHR && iszerodev(vp->v_rdev)) {
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handle = NULL;
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maxprot = VM_PROT_ALL;
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flags |= MAP_ANON;
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pos = 0;
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} else {
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/*
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* cdevs does not provide private mappings of any kind.
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*/
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/*
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* However, for XIG X server to continue to work,
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* we should allow the superuser to do it anyway.
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* We only allow it at securelevel < 1.
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* (Because the XIG X server writes directly to video
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* memory via /dev/mem, it should never work at any
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* other securelevel.
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* XXX this will have to go
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*/
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if (securelevel >= 1)
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disablexworkaround = 1;
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else
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disablexworkaround = suser(p);
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if (vp->v_type == VCHR && disablexworkaround &&
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(flags & (MAP_PRIVATE|MAP_COPY)))
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return (EINVAL);
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/*
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* Ensure that file and memory protections are
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* compatible. Note that we only worry about
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* writability if mapping is shared; in this case,
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* current and max prot are dictated by the open file.
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* XXX use the vnode instead? Problem is: what
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* credentials do we use for determination? What if
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* proc does a setuid?
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*/
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maxprot = VM_PROT_EXECUTE; /* ??? */
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if (fp->f_flag & FREAD)
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maxprot |= VM_PROT_READ;
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else if (prot & PROT_READ)
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return (EACCES);
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/*
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* If we are sharing potential changes (either via
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* MAP_SHARED or via the implicit sharing of character
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* device mappings), and we are trying to get write
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* permission although we opened it without asking
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* for it, bail out. Check for superuser, only if
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* we're at securelevel < 1, to allow the XIG X server
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* to continue to work.
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*/
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if ((flags & MAP_SHARED) != 0 ||
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(vp->v_type == VCHR && disablexworkaround)) {
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if ((fp->f_flag & FWRITE) != 0) {
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struct vattr va;
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if ((error =
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VOP_GETATTR(vp, &va,
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p->p_ucred, p)))
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return (error);
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if ((va.va_flags &
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(IMMUTABLE|APPEND)) == 0)
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maxprot |= VM_PROT_WRITE;
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else if (prot & PROT_WRITE)
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return (EPERM);
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} else if ((prot & PROT_WRITE) != 0)
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return (EACCES);
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} else
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maxprot |= VM_PROT_WRITE;
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handle = (void *)vp;
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}
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}
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/*
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* Do not allow more then a certain number of vm_map_entry structures
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* per process. Scale with the number of rforks sharing the map
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* to make the limit reasonable for threads.
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*/
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if (max_proc_mmap &&
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vms->vm_map.nentries >= max_proc_mmap * vms->vm_refcnt) {
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return (ENOMEM);
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}
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error = vm_mmap(&vms->vm_map, &addr, size, prot, maxprot,
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flags, handle, pos);
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if (error == 0)
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p->p_retval[0] = (register_t) (addr + pageoff);
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return (error);
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}
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#ifdef COMPAT_43
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#ifndef _SYS_SYSPROTO_H_
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struct ommap_args {
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caddr_t addr;
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int len;
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int prot;
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int flags;
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int fd;
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long pos;
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};
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#endif
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int
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ommap(p, uap)
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struct proc *p;
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register struct ommap_args *uap;
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{
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struct mmap_args nargs;
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static const char cvtbsdprot[8] = {
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0,
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PROT_EXEC,
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PROT_WRITE,
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PROT_EXEC | PROT_WRITE,
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PROT_READ,
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PROT_EXEC | PROT_READ,
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PROT_WRITE | PROT_READ,
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PROT_EXEC | PROT_WRITE | PROT_READ,
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};
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#define OMAP_ANON 0x0002
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#define OMAP_COPY 0x0020
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#define OMAP_SHARED 0x0010
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#define OMAP_FIXED 0x0100
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#define OMAP_INHERIT 0x0800
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nargs.addr = uap->addr;
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nargs.len = uap->len;
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nargs.prot = cvtbsdprot[uap->prot & 0x7];
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nargs.flags = 0;
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if (uap->flags & OMAP_ANON)
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nargs.flags |= MAP_ANON;
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if (uap->flags & OMAP_COPY)
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nargs.flags |= MAP_COPY;
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if (uap->flags & OMAP_SHARED)
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nargs.flags |= MAP_SHARED;
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else
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nargs.flags |= MAP_PRIVATE;
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if (uap->flags & OMAP_FIXED)
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nargs.flags |= MAP_FIXED;
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if (uap->flags & OMAP_INHERIT)
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nargs.flags |= MAP_INHERIT;
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nargs.fd = uap->fd;
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nargs.pos = uap->pos;
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return (mmap(p, &nargs));
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}
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#endif /* COMPAT_43 */
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#ifndef _SYS_SYSPROTO_H_
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struct msync_args {
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void *addr;
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int len;
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int flags;
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};
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#endif
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int
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msync(p, uap)
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struct proc *p;
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struct msync_args *uap;
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{
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vm_offset_t addr;
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vm_size_t size, pageoff;
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int flags;
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vm_map_t map;
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int rv;
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addr = (vm_offset_t) uap->addr;
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size = uap->len;
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flags = uap->flags;
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pageoff = (addr & PAGE_MASK);
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addr -= pageoff;
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size += pageoff;
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size = (vm_size_t) round_page(size);
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if (addr + size < addr)
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return(EINVAL);
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if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
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return (EINVAL);
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map = &p->p_vmspace->vm_map;
|
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|
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/*
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* XXX Gak! If size is zero we are supposed to sync "all modified
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* pages with the region containing addr". Unfortunately, we don't
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* really keep track of individual mmaps so we approximate by flushing
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* the range of the map entry containing addr. This can be incorrect
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* if the region splits or is coalesced with a neighbor.
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*/
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if (size == 0) {
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vm_map_entry_t entry;
|
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vm_map_lock_read(map);
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rv = vm_map_lookup_entry(map, addr, &entry);
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vm_map_unlock_read(map);
|
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if (rv == FALSE)
|
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return (EINVAL);
|
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addr = entry->start;
|
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size = entry->end - entry->start;
|
|
}
|
|
|
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/*
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* Clean the pages and interpret the return value.
|
|
*/
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rv = vm_map_clean(map, addr, addr + size, (flags & MS_ASYNC) == 0,
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(flags & MS_INVALIDATE) != 0);
|
|
|
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switch (rv) {
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case KERN_SUCCESS:
|
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break;
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case KERN_INVALID_ADDRESS:
|
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return (EINVAL); /* Sun returns ENOMEM? */
|
|
case KERN_FAILURE:
|
|
return (EIO);
|
|
default:
|
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return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct munmap_args {
|
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void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
int
|
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munmap(p, uap)
|
|
register struct proc *p;
|
|
register struct munmap_args *uap;
|
|
{
|
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vm_offset_t addr;
|
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vm_size_t size, pageoff;
|
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vm_map_t map;
|
|
|
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addr = (vm_offset_t) uap->addr;
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|
size = uap->len;
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|
|
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pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return(EINVAL);
|
|
|
|
if (size == 0)
|
|
return (0);
|
|
|
|
/*
|
|
* Check for illegal addresses. Watch out for address wrap... Note
|
|
* that VM_*_ADDRESS are not constants due to casts (argh).
|
|
*/
|
|
if (VM_MAXUSER_ADDRESS > 0 && addr + size > VM_MAXUSER_ADDRESS)
|
|
return (EINVAL);
|
|
#ifndef i386
|
|
if (VM_MIN_ADDRESS > 0 && addr < VM_MIN_ADDRESS)
|
|
return (EINVAL);
|
|
#endif
|
|
map = &p->p_vmspace->vm_map;
|
|
/*
|
|
* Make sure entire range is allocated.
|
|
*/
|
|
if (!vm_map_check_protection(map, addr, addr + size, VM_PROT_NONE))
|
|
return (EINVAL);
|
|
/* returns nothing but KERN_SUCCESS anyway */
|
|
(void) vm_map_remove(map, addr, addr + size);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
munmapfd(p, fd)
|
|
struct proc *p;
|
|
int fd;
|
|
{
|
|
/*
|
|
* XXX should unmap any regions mapped to this file
|
|
*/
|
|
p->p_fd->fd_ofileflags[fd] &= ~UF_MAPPED;
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mprotect_args {
|
|
const void *addr;
|
|
size_t len;
|
|
int prot;
|
|
};
|
|
#endif
|
|
int
|
|
mprotect(p, uap)
|
|
struct proc *p;
|
|
struct mprotect_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
register vm_prot_t prot;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
prot = uap->prot & VM_PROT_ALL;
|
|
#if defined(VM_PROT_READ_IS_EXEC)
|
|
if (prot & VM_PROT_READ)
|
|
prot |= VM_PROT_EXECUTE;
|
|
#endif
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return(EINVAL);
|
|
|
|
switch (vm_map_protect(&p->p_vmspace->vm_map, addr, addr + size, prot,
|
|
FALSE)) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_PROTECTION_FAILURE:
|
|
return (EACCES);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct minherit_args {
|
|
void *addr;
|
|
size_t len;
|
|
int inherit;
|
|
};
|
|
#endif
|
|
int
|
|
minherit(p, uap)
|
|
struct proc *p;
|
|
struct minherit_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
register vm_inherit_t inherit;
|
|
|
|
addr = (vm_offset_t)uap->addr;
|
|
size = uap->len;
|
|
inherit = uap->inherit;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return(EINVAL);
|
|
|
|
switch (vm_map_inherit(&p->p_vmspace->vm_map, addr, addr+size,
|
|
inherit)) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_PROTECTION_FAILURE:
|
|
return (EACCES);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct madvise_args {
|
|
void *addr;
|
|
size_t len;
|
|
int behav;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
madvise(p, uap)
|
|
struct proc *p;
|
|
struct madvise_args *uap;
|
|
{
|
|
vm_offset_t start, end;
|
|
|
|
/*
|
|
* Check for illegal behavior
|
|
*/
|
|
if (uap->behav < 0 || uap->behav > MADV_CORE)
|
|
return (EINVAL);
|
|
/*
|
|
* Check for illegal addresses. Watch out for address wrap... Note
|
|
* that VM_*_ADDRESS are not constants due to casts (argh).
|
|
*/
|
|
if (VM_MAXUSER_ADDRESS > 0 &&
|
|
((vm_offset_t) uap->addr + uap->len) > VM_MAXUSER_ADDRESS)
|
|
return (EINVAL);
|
|
#ifndef i386
|
|
if (VM_MIN_ADDRESS > 0 && uap->addr < VM_MIN_ADDRESS)
|
|
return (EINVAL);
|
|
#endif
|
|
if (((vm_offset_t) uap->addr + uap->len) < (vm_offset_t) uap->addr)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Since this routine is only advisory, we default to conservative
|
|
* behavior.
|
|
*/
|
|
start = trunc_page((vm_offset_t) uap->addr);
|
|
end = round_page((vm_offset_t) uap->addr + uap->len);
|
|
|
|
if (vm_map_madvise(&p->p_vmspace->vm_map, start, end, uap->behav))
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mincore_args {
|
|
const void *addr;
|
|
size_t len;
|
|
char *vec;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
mincore(p, uap)
|
|
struct proc *p;
|
|
struct mincore_args *uap;
|
|
{
|
|
vm_offset_t addr, first_addr;
|
|
vm_offset_t end, cend;
|
|
pmap_t pmap;
|
|
vm_map_t map;
|
|
char *vec;
|
|
int error;
|
|
int vecindex, lastvecindex;
|
|
register vm_map_entry_t current;
|
|
vm_map_entry_t entry;
|
|
int mincoreinfo;
|
|
unsigned int timestamp;
|
|
|
|
/*
|
|
* Make sure that the addresses presented are valid for user
|
|
* mode.
|
|
*/
|
|
first_addr = addr = trunc_page((vm_offset_t) uap->addr);
|
|
end = addr + (vm_size_t)round_page(uap->len);
|
|
if (VM_MAXUSER_ADDRESS > 0 && end > VM_MAXUSER_ADDRESS)
|
|
return (EINVAL);
|
|
if (end < addr)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Address of byte vector
|
|
*/
|
|
vec = uap->vec;
|
|
|
|
map = &p->p_vmspace->vm_map;
|
|
pmap = vmspace_pmap(p->p_vmspace);
|
|
|
|
vm_map_lock_read(map);
|
|
RestartScan:
|
|
timestamp = map->timestamp;
|
|
|
|
if (!vm_map_lookup_entry(map, addr, &entry))
|
|
entry = entry->next;
|
|
|
|
/*
|
|
* Do this on a map entry basis so that if the pages are not
|
|
* in the current processes address space, we can easily look
|
|
* up the pages elsewhere.
|
|
*/
|
|
lastvecindex = -1;
|
|
for(current = entry;
|
|
(current != &map->header) && (current->start < end);
|
|
current = current->next) {
|
|
|
|
/*
|
|
* ignore submaps (for now) or null objects
|
|
*/
|
|
if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
|
|
current->object.vm_object == NULL)
|
|
continue;
|
|
|
|
/*
|
|
* limit this scan to the current map entry and the
|
|
* limits for the mincore call
|
|
*/
|
|
if (addr < current->start)
|
|
addr = current->start;
|
|
cend = current->end;
|
|
if (cend > end)
|
|
cend = end;
|
|
|
|
/*
|
|
* scan this entry one page at a time
|
|
*/
|
|
while(addr < cend) {
|
|
/*
|
|
* Check pmap first, it is likely faster, also
|
|
* it can provide info as to whether we are the
|
|
* one referencing or modifying the page.
|
|
*/
|
|
mincoreinfo = pmap_mincore(pmap, addr);
|
|
if (!mincoreinfo) {
|
|
vm_pindex_t pindex;
|
|
vm_ooffset_t offset;
|
|
vm_page_t m;
|
|
/*
|
|
* calculate the page index into the object
|
|
*/
|
|
offset = current->offset + (addr - current->start);
|
|
pindex = OFF_TO_IDX(offset);
|
|
m = vm_page_lookup(current->object.vm_object,
|
|
pindex);
|
|
/*
|
|
* if the page is resident, then gather information about
|
|
* it.
|
|
*/
|
|
if (m) {
|
|
mincoreinfo = MINCORE_INCORE;
|
|
if (m->dirty ||
|
|
pmap_is_modified(VM_PAGE_TO_PHYS(m)))
|
|
mincoreinfo |= MINCORE_MODIFIED_OTHER;
|
|
if ((m->flags & PG_REFERENCED) ||
|
|
pmap_ts_referenced(VM_PAGE_TO_PHYS(m))) {
|
|
vm_page_flag_set(m, PG_REFERENCED);
|
|
mincoreinfo |= MINCORE_REFERENCED_OTHER;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* subyte may page fault. In case it needs to modify
|
|
* the map, we release the lock.
|
|
*/
|
|
vm_map_unlock_read(map);
|
|
|
|
/*
|
|
* calculate index into user supplied byte vector
|
|
*/
|
|
vecindex = OFF_TO_IDX(addr - first_addr);
|
|
|
|
/*
|
|
* If we have skipped map entries, we need to make sure that
|
|
* the byte vector is zeroed for those skipped entries.
|
|
*/
|
|
while((lastvecindex + 1) < vecindex) {
|
|
error = subyte( vec + lastvecindex, 0);
|
|
if (error) {
|
|
return (EFAULT);
|
|
}
|
|
++lastvecindex;
|
|
}
|
|
|
|
/*
|
|
* Pass the page information to the user
|
|
*/
|
|
error = subyte( vec + vecindex, mincoreinfo);
|
|
if (error) {
|
|
return (EFAULT);
|
|
}
|
|
|
|
/*
|
|
* If the map has changed, due to the subyte, the previous
|
|
* output may be invalid.
|
|
*/
|
|
vm_map_lock_read(map);
|
|
if (timestamp != map->timestamp)
|
|
goto RestartScan;
|
|
|
|
lastvecindex = vecindex;
|
|
addr += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* subyte may page fault. In case it needs to modify
|
|
* the map, we release the lock.
|
|
*/
|
|
vm_map_unlock_read(map);
|
|
|
|
/*
|
|
* Zero the last entries in the byte vector.
|
|
*/
|
|
vecindex = OFF_TO_IDX(end - first_addr);
|
|
while((lastvecindex + 1) < vecindex) {
|
|
error = subyte( vec + lastvecindex, 0);
|
|
if (error) {
|
|
return (EFAULT);
|
|
}
|
|
++lastvecindex;
|
|
}
|
|
|
|
/*
|
|
* If the map has changed, due to the subyte, the previous
|
|
* output may be invalid.
|
|
*/
|
|
vm_map_lock_read(map);
|
|
if (timestamp != map->timestamp)
|
|
goto RestartScan;
|
|
vm_map_unlock_read(map);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlock_args {
|
|
const void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
int
|
|
mlock(p, uap)
|
|
struct proc *p;
|
|
struct mlock_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
int error;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
|
|
/* disable wrap around */
|
|
if (addr + size < addr)
|
|
return (EINVAL);
|
|
|
|
if (atop(size) + cnt.v_wire_count > vm_page_max_wired)
|
|
return (EAGAIN);
|
|
|
|
#ifdef pmap_wired_count
|
|
if (size + ptoa(pmap_wired_count(vm_map_pmap(&p->p_vmspace->vm_map))) >
|
|
p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur)
|
|
return (ENOMEM);
|
|
#else
|
|
error = suser(p);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
error = vm_map_user_pageable(&p->p_vmspace->vm_map, addr, addr + size, FALSE);
|
|
return (error == KERN_SUCCESS ? 0 : ENOMEM);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlockall_args {
|
|
int how;
|
|
};
|
|
#endif
|
|
|
|
int
|
|
mlockall(p, uap)
|
|
struct proc *p;
|
|
struct mlockall_args *uap;
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlockall_args {
|
|
int how;
|
|
};
|
|
#endif
|
|
|
|
int
|
|
munlockall(p, uap)
|
|
struct proc *p;
|
|
struct munlockall_args *uap;
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct munlock_args {
|
|
const void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
int
|
|
munlock(p, uap)
|
|
struct proc *p;
|
|
struct munlock_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
int error;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
|
|
/* disable wrap around */
|
|
if (addr + size < addr)
|
|
return (EINVAL);
|
|
|
|
#ifndef pmap_wired_count
|
|
error = suser(p);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
error = vm_map_user_pageable(&p->p_vmspace->vm_map, addr, addr + size, TRUE);
|
|
return (error == KERN_SUCCESS ? 0 : ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* Internal version of mmap.
|
|
* Currently used by mmap, exec, and sys5 shared memory.
|
|
* Handle is either a vnode pointer or NULL for MAP_ANON.
|
|
*/
|
|
int
|
|
vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
|
|
vm_prot_t maxprot, int flags,
|
|
void *handle,
|
|
vm_ooffset_t foff)
|
|
{
|
|
boolean_t fitit;
|
|
vm_object_t object;
|
|
struct vnode *vp = NULL;
|
|
objtype_t type;
|
|
int rv = KERN_SUCCESS;
|
|
vm_ooffset_t objsize;
|
|
int docow;
|
|
struct proc *p = curproc;
|
|
|
|
if (size == 0)
|
|
return (0);
|
|
|
|
objsize = size = round_page(size);
|
|
|
|
/*
|
|
* We currently can only deal with page aligned file offsets.
|
|
* The check is here rather than in the syscall because the
|
|
* kernel calls this function internally for other mmaping
|
|
* operations (such as in exec) and non-aligned offsets will
|
|
* cause pmap inconsistencies...so we want to be sure to
|
|
* disallow this in all cases.
|
|
*/
|
|
if (foff & PAGE_MASK)
|
|
return (EINVAL);
|
|
|
|
if ((flags & MAP_FIXED) == 0) {
|
|
fitit = TRUE;
|
|
*addr = round_page(*addr);
|
|
} else {
|
|
if (*addr != trunc_page(*addr))
|
|
return (EINVAL);
|
|
fitit = FALSE;
|
|
(void) vm_map_remove(map, *addr, *addr + size);
|
|
}
|
|
|
|
/*
|
|
* Lookup/allocate object.
|
|
*/
|
|
if (flags & MAP_ANON) {
|
|
type = OBJT_DEFAULT;
|
|
/*
|
|
* Unnamed anonymous regions always start at 0.
|
|
*/
|
|
if (handle == 0)
|
|
foff = 0;
|
|
} else {
|
|
vp = (struct vnode *) handle;
|
|
if (vp->v_type == VCHR) {
|
|
type = OBJT_DEVICE;
|
|
handle = (void *)(intptr_t)vp->v_rdev;
|
|
} else {
|
|
struct vattr vat;
|
|
int error;
|
|
|
|
error = VOP_GETATTR(vp, &vat, p->p_ucred, p);
|
|
if (error)
|
|
return (error);
|
|
objsize = round_page(vat.va_size);
|
|
type = OBJT_VNODE;
|
|
/*
|
|
* if it is a regular file without any references
|
|
* we do not need to sync it.
|
|
*/
|
|
if (vp->v_type == VREG && vat.va_nlink == 0) {
|
|
flags |= MAP_NOSYNC;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (handle == NULL) {
|
|
object = NULL;
|
|
docow = 0;
|
|
} else {
|
|
object = vm_pager_allocate(type,
|
|
handle, objsize, prot, foff);
|
|
if (object == NULL)
|
|
return (type == OBJT_DEVICE ? EINVAL : ENOMEM);
|
|
docow = MAP_PREFAULT_PARTIAL;
|
|
}
|
|
|
|
/*
|
|
* Force device mappings to be shared.
|
|
*/
|
|
if (type == OBJT_DEVICE) {
|
|
flags &= ~(MAP_PRIVATE|MAP_COPY);
|
|
flags |= MAP_SHARED;
|
|
}
|
|
|
|
if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
|
|
docow |= MAP_COPY_ON_WRITE;
|
|
if (flags & MAP_NOSYNC)
|
|
docow |= MAP_DISABLE_SYNCER;
|
|
if (flags & MAP_NOCORE)
|
|
docow |= MAP_DISABLE_COREDUMP;
|
|
|
|
#if defined(VM_PROT_READ_IS_EXEC)
|
|
if (prot & VM_PROT_READ)
|
|
prot |= VM_PROT_EXECUTE;
|
|
|
|
if (maxprot & VM_PROT_READ)
|
|
maxprot |= VM_PROT_EXECUTE;
|
|
#endif
|
|
|
|
if (fitit) {
|
|
*addr = pmap_addr_hint(object, *addr, size);
|
|
}
|
|
|
|
if (flags & MAP_STACK)
|
|
rv = vm_map_stack (map, *addr, size, prot,
|
|
maxprot, docow);
|
|
else
|
|
rv = vm_map_find(map, object, foff, addr, size, fitit,
|
|
prot, maxprot, docow);
|
|
|
|
if (rv != KERN_SUCCESS) {
|
|
/*
|
|
* Lose the object reference. Will destroy the
|
|
* object if it's an unnamed anonymous mapping
|
|
* or named anonymous without other references.
|
|
*/
|
|
vm_object_deallocate(object);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Shared memory is also shared with children.
|
|
*/
|
|
if (flags & (MAP_SHARED|MAP_INHERIT)) {
|
|
rv = vm_map_inherit(map, *addr, *addr + size, VM_INHERIT_SHARE);
|
|
if (rv != KERN_SUCCESS) {
|
|
(void) vm_map_remove(map, *addr, *addr + size);
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
switch (rv) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_INVALID_ADDRESS:
|
|
case KERN_NO_SPACE:
|
|
return (ENOMEM);
|
|
case KERN_PROTECTION_FAILURE:
|
|
return (EACCES);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|