2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1991, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
36 * @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
40 * Mapped file (mmap) interface to VM
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
46 #include "opt_compat.h"
47 #include "opt_hwpmc_hooks.h"
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/capability.h>
52 #include <sys/kernel.h>
54 #include <sys/mutex.h>
55 #include <sys/sysproto.h>
56 #include <sys/filedesc.h>
59 #include <sys/racct.h>
60 #include <sys/resource.h>
61 #include <sys/resourcevar.h>
62 #include <sys/rwlock.h>
63 #include <sys/sysctl.h>
64 #include <sys/vnode.h>
65 #include <sys/fcntl.h>
68 #include <sys/mount.h>
71 #include <sys/sysent.h>
72 #include <sys/vmmeter.h>
74 #include <security/mac/mac_framework.h>
77 #include <vm/vm_param.h>
79 #include <vm/vm_map.h>
80 #include <vm/vm_object.h>
81 #include <vm/vm_page.h>
82 #include <vm/vm_pager.h>
83 #include <vm/vm_pageout.h>
84 #include <vm/vm_extern.h>
85 #include <vm/vm_page.h>
86 #include <vm/vnode_pager.h>
89 #include <sys/pmckern.h>
93 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RW | CTLFLAG_TUN, &old_mlock, 0,
94 "Do not apply RLIMIT_MEMLOCK on mlockall");
95 TUNABLE_INT("vm.old_mlock", &old_mlock);
98 #define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
101 static int vm_mmap_vnode(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
102 int *, struct vnode *, vm_ooffset_t *, vm_object_t *, boolean_t *);
103 static int vm_mmap_cdev(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
104 int *, struct cdev *, vm_ooffset_t *, vm_object_t *);
105 static int vm_mmap_shm(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
106 int *, struct shmfd *, vm_ooffset_t, vm_object_t *);
108 #ifndef _SYS_SYSPROTO_H_
121 struct sbrk_args *uap;
123 /* Not yet implemented */
127 #ifndef _SYS_SYSPROTO_H_
140 struct sstk_args *uap;
142 /* Not yet implemented */
146 #if defined(COMPAT_43)
147 #ifndef _SYS_SYSPROTO_H_
148 struct getpagesize_args {
154 ogetpagesize(td, uap)
156 struct getpagesize_args *uap;
159 td->td_retval[0] = PAGE_SIZE;
162 #endif /* COMPAT_43 */
166 * Memory Map (mmap) system call. Note that the file offset
167 * and address are allowed to be NOT page aligned, though if
168 * the MAP_FIXED flag it set, both must have the same remainder
169 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
170 * page-aligned, the actual mapping starts at trunc_page(addr)
171 * and the return value is adjusted up by the page offset.
173 * Generally speaking, only character devices which are themselves
174 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise
175 * there would be no cache coherency between a descriptor and a VM mapping
176 * both to the same character device.
178 #ifndef _SYS_SYSPROTO_H_
196 struct mmap_args *uap;
199 struct pmckern_map_in pkm;
204 vm_size_t size, pageoff;
205 vm_prot_t cap_maxprot, prot, maxprot;
207 objtype_t handle_type;
208 int align, error, flags;
210 struct vmspace *vms = td->td_proc->p_vmspace;
213 addr = (vm_offset_t) uap->addr;
215 prot = uap->prot & VM_PROT_ALL;
222 * Enforce the constraints.
223 * Mapping of length 0 is only allowed for old binaries.
224 * Anonymous mapping shall specify -1 as filedescriptor and
225 * zero position for new code. Be nice to ancient a.out
226 * binaries and correct pos for anonymous mapping, since old
227 * ld.so sometimes issues anonymous map requests with non-zero
230 if (!SV_CURPROC_FLAG(SV_AOUT)) {
231 if ((uap->len == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) ||
232 ((flags & MAP_ANON) != 0 && (uap->fd != -1 || pos != 0)))
235 if ((flags & MAP_ANON) != 0)
239 if (flags & MAP_STACK) {
240 if ((uap->fd != -1) ||
241 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
248 * Align the file position to a page boundary,
249 * and save its page offset component.
251 pageoff = (pos & PAGE_MASK);
254 /* Adjust size for rounding (on both ends). */
255 size += pageoff; /* low end... */
256 size = (vm_size_t) round_page(size); /* hi end */
258 /* Ensure alignment is at least a page and fits in a pointer. */
259 align = flags & MAP_ALIGNMENT_MASK;
260 if (align != 0 && align != MAP_ALIGNED_SUPER &&
261 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
262 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
266 * Check for illegal addresses. Watch out for address wrap... Note
267 * that VM_*_ADDRESS are not constants due to casts (argh).
269 if (flags & MAP_FIXED) {
271 * The specified address must have the same remainder
272 * as the file offset taken modulo PAGE_SIZE, so it
273 * should be aligned after adjustment by pageoff.
276 if (addr & PAGE_MASK)
279 /* Address range must be all in user VM space. */
280 if (addr < vm_map_min(&vms->vm_map) ||
281 addr + size > vm_map_max(&vms->vm_map))
283 if (addr + size < addr)
286 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
288 } else if (flags & MAP_32BIT) {
290 * For MAP_32BIT, override the hint if it is too high and
291 * do not bother moving the mapping past the heap (since
292 * the heap is usually above 2GB).
294 if (addr + size > MAP_32BIT_MAX_ADDR)
299 * XXX for non-fixed mappings where no hint is provided or
300 * the hint would fall in the potential heap space,
301 * place it after the end of the largest possible heap.
303 * There should really be a pmap call to determine a reasonable
306 PROC_LOCK(td->td_proc);
308 (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
309 addr < round_page((vm_offset_t)vms->vm_daddr +
310 lim_max(td->td_proc, RLIMIT_DATA))))
311 addr = round_page((vm_offset_t)vms->vm_daddr +
312 lim_max(td->td_proc, RLIMIT_DATA));
313 PROC_UNLOCK(td->td_proc);
315 if (flags & MAP_ANON) {
317 * Mapping blank space is trivial.
320 handle_type = OBJT_DEFAULT;
321 maxprot = VM_PROT_ALL;
322 cap_maxprot = VM_PROT_ALL;
325 * Mapping file, get fp for validation and don't let the
326 * descriptor disappear on us if we block. Check capability
327 * rights, but also return the maximum rights to be combined
328 * with maxprot later.
330 cap_rights_init(&rights, CAP_MMAP);
331 if (prot & PROT_READ)
332 cap_rights_set(&rights, CAP_MMAP_R);
333 if ((flags & MAP_SHARED) != 0) {
334 if (prot & PROT_WRITE)
335 cap_rights_set(&rights, CAP_MMAP_W);
337 if (prot & PROT_EXEC)
338 cap_rights_set(&rights, CAP_MMAP_X);
339 error = fget_mmap(td, uap->fd, &rights, &cap_maxprot, &fp);
342 if (fp->f_type == DTYPE_SHM) {
344 handle_type = OBJT_SWAP;
345 maxprot = VM_PROT_NONE;
347 /* FREAD should always be set. */
348 if (fp->f_flag & FREAD)
349 maxprot |= VM_PROT_EXECUTE | VM_PROT_READ;
350 if (fp->f_flag & FWRITE)
351 maxprot |= VM_PROT_WRITE;
354 if (fp->f_type != DTYPE_VNODE) {
358 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
359 defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
361 * POSIX shared-memory objects are defined to have
362 * kernel persistence, and are not defined to support
363 * read(2)/write(2) -- or even open(2). Thus, we can
364 * use MAP_ASYNC to trade on-disk coherence for speed.
365 * The shm_open(3) library routine turns on the FPOSIXSHM
366 * flag to request this behavior.
368 if (fp->f_flag & FPOSIXSHM)
373 * Ensure that file and memory protections are
374 * compatible. Note that we only worry about
375 * writability if mapping is shared; in this case,
376 * current and max prot are dictated by the open file.
377 * XXX use the vnode instead? Problem is: what
378 * credentials do we use for determination? What if
379 * proc does a setuid?
381 if (vp->v_mount != NULL && vp->v_mount->mnt_flag & MNT_NOEXEC)
382 maxprot = VM_PROT_NONE;
384 maxprot = VM_PROT_EXECUTE;
385 if (fp->f_flag & FREAD) {
386 maxprot |= VM_PROT_READ;
387 } else if (prot & PROT_READ) {
392 * If we are sharing potential changes (either via
393 * MAP_SHARED or via the implicit sharing of character
394 * device mappings), and we are trying to get write
395 * permission although we opened it without asking
398 if ((flags & MAP_SHARED) != 0) {
399 if ((fp->f_flag & FWRITE) != 0) {
400 maxprot |= VM_PROT_WRITE;
401 } else if ((prot & PROT_WRITE) != 0) {
405 } else if (vp->v_type != VCHR || (fp->f_flag & FWRITE) != 0) {
406 maxprot |= VM_PROT_WRITE;
407 cap_maxprot |= VM_PROT_WRITE;
410 handle_type = OBJT_VNODE;
414 maxprot &= cap_maxprot;
415 error = vm_mmap(&vms->vm_map, &addr, size, prot, maxprot,
416 flags, handle_type, handle, pos);
419 /* inform hwpmc(4) if an executable is being mapped */
420 if (error == 0 && handle_type == OBJT_VNODE &&
421 (prot & PROT_EXEC)) {
422 pkm.pm_file = handle;
423 pkm.pm_address = (uintptr_t) addr;
424 PMC_CALL_HOOK(td, PMC_FN_MMAP, (void *) &pkm);
428 td->td_retval[0] = (register_t) (addr + pageoff);
437 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
439 struct mmap_args oargs;
441 oargs.addr = uap->addr;
442 oargs.len = uap->len;
443 oargs.prot = uap->prot;
444 oargs.flags = uap->flags;
446 oargs.pos = uap->pos;
447 return (sys_mmap(td, &oargs));
451 #ifndef _SYS_SYSPROTO_H_
464 struct ommap_args *uap;
466 struct mmap_args nargs;
467 static const char cvtbsdprot[8] = {
471 PROT_EXEC | PROT_WRITE,
473 PROT_EXEC | PROT_READ,
474 PROT_WRITE | PROT_READ,
475 PROT_EXEC | PROT_WRITE | PROT_READ,
478 #define OMAP_ANON 0x0002
479 #define OMAP_COPY 0x0020
480 #define OMAP_SHARED 0x0010
481 #define OMAP_FIXED 0x0100
483 nargs.addr = uap->addr;
484 nargs.len = uap->len;
485 nargs.prot = cvtbsdprot[uap->prot & 0x7];
486 #ifdef COMPAT_FREEBSD32
487 #if defined(__amd64__) || defined(__ia64__)
488 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
490 nargs.prot |= PROT_EXEC;
494 if (uap->flags & OMAP_ANON)
495 nargs.flags |= MAP_ANON;
496 if (uap->flags & OMAP_COPY)
497 nargs.flags |= MAP_COPY;
498 if (uap->flags & OMAP_SHARED)
499 nargs.flags |= MAP_SHARED;
501 nargs.flags |= MAP_PRIVATE;
502 if (uap->flags & OMAP_FIXED)
503 nargs.flags |= MAP_FIXED;
505 nargs.pos = uap->pos;
506 return (sys_mmap(td, &nargs));
508 #endif /* COMPAT_43 */
511 #ifndef _SYS_SYSPROTO_H_
524 struct msync_args *uap;
527 vm_size_t size, pageoff;
532 addr = (vm_offset_t) uap->addr;
536 pageoff = (addr & PAGE_MASK);
539 size = (vm_size_t) round_page(size);
540 if (addr + size < addr)
543 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
546 map = &td->td_proc->p_vmspace->vm_map;
549 * Clean the pages and interpret the return value.
551 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
552 (flags & MS_INVALIDATE) != 0);
556 case KERN_INVALID_ADDRESS:
557 return (EINVAL); /* Sun returns ENOMEM? */
558 case KERN_INVALID_ARGUMENT:
567 #ifndef _SYS_SYSPROTO_H_
579 struct munmap_args *uap;
582 struct pmckern_map_out pkm;
583 vm_map_entry_t entry;
586 vm_size_t size, pageoff;
589 addr = (vm_offset_t) uap->addr;
594 pageoff = (addr & PAGE_MASK);
597 size = (vm_size_t) round_page(size);
598 if (addr + size < addr)
602 * Check for illegal addresses. Watch out for address wrap...
604 map = &td->td_proc->p_vmspace->vm_map;
605 if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
610 * Inform hwpmc if the address range being unmapped contains
611 * an executable region.
613 pkm.pm_address = (uintptr_t) NULL;
614 if (vm_map_lookup_entry(map, addr, &entry)) {
616 entry != &map->header && entry->start < addr + size;
617 entry = entry->next) {
618 if (vm_map_check_protection(map, entry->start,
619 entry->end, VM_PROT_EXECUTE) == TRUE) {
620 pkm.pm_address = (uintptr_t) addr;
621 pkm.pm_size = (size_t) size;
627 vm_map_delete(map, addr, addr + size);
630 /* downgrade the lock to prevent a LOR with the pmc-sx lock */
631 vm_map_lock_downgrade(map);
632 if (pkm.pm_address != (uintptr_t) NULL)
633 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
634 vm_map_unlock_read(map);
638 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */
642 #ifndef _SYS_SYSPROTO_H_
643 struct mprotect_args {
653 sys_mprotect(td, uap)
655 struct mprotect_args *uap;
658 vm_size_t size, pageoff;
661 addr = (vm_offset_t) uap->addr;
663 prot = uap->prot & VM_PROT_ALL;
665 pageoff = (addr & PAGE_MASK);
668 size = (vm_size_t) round_page(size);
669 if (addr + size < addr)
672 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr,
673 addr + size, prot, FALSE)) {
676 case KERN_PROTECTION_FAILURE:
678 case KERN_RESOURCE_SHORTAGE:
684 #ifndef _SYS_SYSPROTO_H_
685 struct minherit_args {
695 sys_minherit(td, uap)
697 struct minherit_args *uap;
700 vm_size_t size, pageoff;
701 vm_inherit_t inherit;
703 addr = (vm_offset_t)uap->addr;
705 inherit = uap->inherit;
707 pageoff = (addr & PAGE_MASK);
710 size = (vm_size_t) round_page(size);
711 if (addr + size < addr)
714 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr,
715 addr + size, inherit)) {
718 case KERN_PROTECTION_FAILURE:
724 #ifndef _SYS_SYSPROTO_H_
725 struct madvise_args {
738 struct madvise_args *uap;
740 vm_offset_t start, end;
746 * Check for our special case, advising the swap pager we are
749 if (uap->behav == MADV_PROTECT) {
750 error = priv_check(td, PRIV_VM_MADV_PROTECT);
754 p->p_flag |= P_PROTECTED;
760 * Check for illegal behavior
762 if (uap->behav < 0 || uap->behav > MADV_CORE)
765 * Check for illegal addresses. Watch out for address wrap... Note
766 * that VM_*_ADDRESS are not constants due to casts (argh).
768 map = &td->td_proc->p_vmspace->vm_map;
769 if ((vm_offset_t)uap->addr < vm_map_min(map) ||
770 (vm_offset_t)uap->addr + uap->len > vm_map_max(map))
772 if (((vm_offset_t) uap->addr + uap->len) < (vm_offset_t) uap->addr)
776 * Since this routine is only advisory, we default to conservative
779 start = trunc_page((vm_offset_t) uap->addr);
780 end = round_page((vm_offset_t) uap->addr + uap->len);
782 if (vm_map_madvise(map, start, end, uap->behav))
787 #ifndef _SYS_SYSPROTO_H_
788 struct mincore_args {
801 struct mincore_args *uap;
803 vm_offset_t addr, first_addr;
804 vm_offset_t end, cend;
809 int vecindex, lastvecindex;
810 vm_map_entry_t current;
811 vm_map_entry_t entry;
813 vm_paddr_t locked_pa;
817 unsigned int timestamp;
821 * Make sure that the addresses presented are valid for user
824 first_addr = addr = trunc_page((vm_offset_t) uap->addr);
825 end = addr + (vm_size_t)round_page(uap->len);
826 map = &td->td_proc->p_vmspace->vm_map;
827 if (end > vm_map_max(map) || end < addr)
831 * Address of byte vector
835 pmap = vmspace_pmap(td->td_proc->p_vmspace);
837 vm_map_lock_read(map);
839 timestamp = map->timestamp;
841 if (!vm_map_lookup_entry(map, addr, &entry)) {
842 vm_map_unlock_read(map);
847 * Do this on a map entry basis so that if the pages are not
848 * in the current processes address space, we can easily look
849 * up the pages elsewhere.
852 for (current = entry;
853 (current != &map->header) && (current->start < end);
854 current = current->next) {
857 * check for contiguity
859 if (current->end < end &&
860 (entry->next == &map->header ||
861 current->next->start > current->end)) {
862 vm_map_unlock_read(map);
867 * ignore submaps (for now) or null objects
869 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
870 current->object.vm_object == NULL)
874 * limit this scan to the current map entry and the
875 * limits for the mincore call
877 if (addr < current->start)
878 addr = current->start;
884 * scan this entry one page at a time
886 while (addr < cend) {
888 * Check pmap first, it is likely faster, also
889 * it can provide info as to whether we are the
890 * one referencing or modifying the page.
896 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa);
897 if (locked_pa != 0) {
899 * The page is mapped by this process but not
900 * both accessed and modified. It is also
901 * managed. Acquire the object lock so that
902 * other mappings might be examined.
904 m = PHYS_TO_VM_PAGE(locked_pa);
905 if (m->object != object) {
907 VM_OBJECT_WUNLOCK(object);
909 locked = VM_OBJECT_TRYWLOCK(object);
912 VM_OBJECT_WLOCK(object);
918 KASSERT(m->valid == VM_PAGE_BITS_ALL,
919 ("mincore: page %p is mapped but invalid",
921 } else if (mincoreinfo == 0) {
923 * The page is not mapped by this process. If
924 * the object implements managed pages, then
925 * determine if the page is resident so that
926 * the mappings might be examined.
928 if (current->object.vm_object != object) {
930 VM_OBJECT_WUNLOCK(object);
931 object = current->object.vm_object;
932 VM_OBJECT_WLOCK(object);
934 if (object->type == OBJT_DEFAULT ||
935 object->type == OBJT_SWAP ||
936 object->type == OBJT_VNODE) {
937 pindex = OFF_TO_IDX(current->offset +
938 (addr - current->start));
939 m = vm_page_lookup(object, pindex);
941 vm_page_is_cached(object, pindex))
942 mincoreinfo = MINCORE_INCORE;
943 if (m != NULL && m->valid == 0)
946 mincoreinfo = MINCORE_INCORE;
950 /* Examine other mappings to the page. */
951 if (m->dirty == 0 && pmap_is_modified(m))
954 mincoreinfo |= MINCORE_MODIFIED_OTHER;
956 * The first test for PGA_REFERENCED is an
957 * optimization. The second test is
958 * required because a concurrent pmap
959 * operation could clear the last reference
960 * and set PGA_REFERENCED before the call to
961 * pmap_is_referenced().
963 if ((m->aflags & PGA_REFERENCED) != 0 ||
964 pmap_is_referenced(m) ||
965 (m->aflags & PGA_REFERENCED) != 0)
966 mincoreinfo |= MINCORE_REFERENCED_OTHER;
969 VM_OBJECT_WUNLOCK(object);
972 * subyte may page fault. In case it needs to modify
973 * the map, we release the lock.
975 vm_map_unlock_read(map);
978 * calculate index into user supplied byte vector
980 vecindex = OFF_TO_IDX(addr - first_addr);
983 * If we have skipped map entries, we need to make sure that
984 * the byte vector is zeroed for those skipped entries.
986 while ((lastvecindex + 1) < vecindex) {
988 error = subyte(vec + lastvecindex, 0);
996 * Pass the page information to the user
998 error = subyte(vec + vecindex, mincoreinfo);
1005 * If the map has changed, due to the subyte, the previous
1006 * output may be invalid.
1008 vm_map_lock_read(map);
1009 if (timestamp != map->timestamp)
1012 lastvecindex = vecindex;
1018 * subyte may page fault. In case it needs to modify
1019 * the map, we release the lock.
1021 vm_map_unlock_read(map);
1024 * Zero the last entries in the byte vector.
1026 vecindex = OFF_TO_IDX(end - first_addr);
1027 while ((lastvecindex + 1) < vecindex) {
1029 error = subyte(vec + lastvecindex, 0);
1037 * If the map has changed, due to the subyte, the previous
1038 * output may be invalid.
1040 vm_map_lock_read(map);
1041 if (timestamp != map->timestamp)
1043 vm_map_unlock_read(map);
1048 #ifndef _SYS_SYSPROTO_H_
1060 struct mlock_args *uap;
1063 return (vm_mlock(td->td_proc, td->td_ucred, uap->addr, uap->len));
1067 vm_mlock(struct proc *proc, struct ucred *cred, const void *addr0, size_t len)
1069 vm_offset_t addr, end, last, start;
1070 vm_size_t npages, size;
1072 unsigned long nsize;
1075 error = priv_check_cred(cred, PRIV_VM_MLOCK, 0);
1078 addr = (vm_offset_t)addr0;
1081 start = trunc_page(addr);
1082 end = round_page(last);
1083 if (last < addr || end < addr)
1085 npages = atop(end - start);
1086 if (npages > vm_page_max_wired)
1088 map = &proc->p_vmspace->vm_map;
1090 nsize = ptoa(npages + pmap_wired_count(map->pmap));
1091 if (nsize > lim_cur(proc, RLIMIT_MEMLOCK)) {
1096 if (npages + cnt.v_wire_count > vm_page_max_wired)
1100 error = racct_set(proc, RACCT_MEMLOCK, nsize);
1105 error = vm_map_wire(map, start, end,
1106 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1108 if (error != KERN_SUCCESS) {
1110 racct_set(proc, RACCT_MEMLOCK,
1111 ptoa(pmap_wired_count(map->pmap)));
1115 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1118 #ifndef _SYS_SYSPROTO_H_
1119 struct mlockall_args {
1128 sys_mlockall(td, uap)
1130 struct mlockall_args *uap;
1135 map = &td->td_proc->p_vmspace->vm_map;
1136 error = priv_check(td, PRIV_VM_MLOCK);
1140 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
1144 * If wiring all pages in the process would cause it to exceed
1145 * a hard resource limit, return ENOMEM.
1147 if (!old_mlock && uap->how & MCL_CURRENT) {
1148 PROC_LOCK(td->td_proc);
1149 if (map->size > lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
1150 PROC_UNLOCK(td->td_proc);
1153 PROC_UNLOCK(td->td_proc);
1156 PROC_LOCK(td->td_proc);
1157 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
1158 PROC_UNLOCK(td->td_proc);
1163 if (uap->how & MCL_FUTURE) {
1165 vm_map_modflags(map, MAP_WIREFUTURE, 0);
1170 if (uap->how & MCL_CURRENT) {
1172 * P1003.1-2001 mandates that all currently mapped pages
1173 * will be memory resident and locked (wired) upon return
1174 * from mlockall(). vm_map_wire() will wire pages, by
1175 * calling vm_fault_wire() for each page in the region.
1177 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
1178 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1179 error = (error == KERN_SUCCESS ? 0 : EAGAIN);
1182 if (error != KERN_SUCCESS) {
1183 PROC_LOCK(td->td_proc);
1184 racct_set(td->td_proc, RACCT_MEMLOCK,
1185 ptoa(pmap_wired_count(map->pmap)));
1186 PROC_UNLOCK(td->td_proc);
1193 #ifndef _SYS_SYSPROTO_H_
1194 struct munlockall_args {
1203 sys_munlockall(td, uap)
1205 struct munlockall_args *uap;
1210 map = &td->td_proc->p_vmspace->vm_map;
1211 error = priv_check(td, PRIV_VM_MUNLOCK);
1215 /* Clear the MAP_WIREFUTURE flag from this vm_map. */
1217 vm_map_modflags(map, 0, MAP_WIREFUTURE);
1220 /* Forcibly unwire all pages. */
1221 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
1222 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1224 if (error == KERN_SUCCESS) {
1225 PROC_LOCK(td->td_proc);
1226 racct_set(td->td_proc, RACCT_MEMLOCK, 0);
1227 PROC_UNLOCK(td->td_proc);
1234 #ifndef _SYS_SYSPROTO_H_
1235 struct munlock_args {
1244 sys_munlock(td, uap)
1246 struct munlock_args *uap;
1248 vm_offset_t addr, end, last, start;
1255 error = priv_check(td, PRIV_VM_MUNLOCK);
1258 addr = (vm_offset_t)uap->addr;
1261 start = trunc_page(addr);
1262 end = round_page(last);
1263 if (last < addr || end < addr)
1265 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
1266 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1268 if (error == KERN_SUCCESS) {
1269 PROC_LOCK(td->td_proc);
1270 map = &td->td_proc->p_vmspace->vm_map;
1271 racct_set(td->td_proc, RACCT_MEMLOCK,
1272 ptoa(pmap_wired_count(map->pmap)));
1273 PROC_UNLOCK(td->td_proc);
1276 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1282 * Helper function for vm_mmap. Perform sanity check specific for mmap
1283 * operations on vnodes.
1285 * For VCHR vnodes, the vnode lock is held over the call to
1286 * vm_mmap_cdev() to keep vp->v_rdev valid.
1289 vm_mmap_vnode(struct thread *td, vm_size_t objsize,
1290 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1291 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp,
1292 boolean_t *writecounted)
1299 int error, flags, locktype;
1302 cred = td->td_ucred;
1303 if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED))
1304 locktype = LK_EXCLUSIVE;
1306 locktype = LK_SHARED;
1307 if ((error = vget(vp, locktype, td)) != 0)
1312 if (vp->v_type == VREG) {
1314 * Get the proper underlying object
1320 if (obj->type == OBJT_VNODE && obj->handle != vp) {
1322 vp = (struct vnode *)obj->handle;
1324 * Bypass filesystems obey the mpsafety of the
1325 * underlying fs. Tmpfs never bypasses.
1327 error = vget(vp, locktype, td);
1331 if (locktype == LK_EXCLUSIVE) {
1332 *writecounted = TRUE;
1333 vnode_pager_update_writecount(obj, 0, objsize);
1335 } else if (vp->v_type == VCHR) {
1336 error = vm_mmap_cdev(td, objsize, prot, maxprotp, flagsp,
1337 vp->v_rdev, foffp, objp);
1345 if ((error = VOP_GETATTR(vp, &va, cred)))
1348 error = mac_vnode_check_mmap(cred, vp, prot, flags);
1352 if ((flags & MAP_SHARED) != 0) {
1353 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
1354 if (prot & PROT_WRITE) {
1358 *maxprotp &= ~VM_PROT_WRITE;
1362 * If it is a regular file without any references
1363 * we do not need to sync it.
1364 * Adjust object size to be the size of actual file.
1366 objsize = round_page(va.va_size);
1367 if (va.va_nlink == 0)
1368 flags |= MAP_NOSYNC;
1369 if (obj->type == OBJT_VNODE)
1370 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
1373 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP,
1374 ("wrong object type"));
1375 vm_object_reference(obj);
1385 vfs_mark_atime(vp, cred);
1388 if (error != 0 && *writecounted) {
1389 *writecounted = FALSE;
1390 vnode_pager_update_writecount(obj, objsize, 0);
1401 * Helper function for vm_mmap. Perform sanity check specific for mmap
1402 * operations on cdevs.
1405 vm_mmap_cdev(struct thread *td, vm_size_t objsize,
1406 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1407 struct cdev *cdev, vm_ooffset_t *foff, vm_object_t *objp)
1411 int error, flags, ref;
1415 dsw = dev_refthread(cdev, &ref);
1418 if (dsw->d_flags & D_MMAP_ANON) {
1419 dev_relthread(cdev, ref);
1420 *maxprotp = VM_PROT_ALL;
1421 *flagsp |= MAP_ANON;
1425 * cdevs do not provide private mappings of any kind.
1427 if ((*maxprotp & VM_PROT_WRITE) == 0 &&
1428 (prot & PROT_WRITE) != 0) {
1429 dev_relthread(cdev, ref);
1432 if (flags & (MAP_PRIVATE|MAP_COPY)) {
1433 dev_relthread(cdev, ref);
1437 * Force device mappings to be shared.
1439 flags |= MAP_SHARED;
1441 error = mac_cdev_check_mmap(td->td_ucred, cdev, prot);
1443 dev_relthread(cdev, ref);
1448 * First, try d_mmap_single(). If that is not implemented
1449 * (returns ENODEV), fall back to using the device pager.
1450 * Note that d_mmap_single() must return a reference to the
1451 * object (it needs to bump the reference count of the object
1452 * it returns somehow).
1454 * XXX assumes VM_PROT_* == PROT_*
1456 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
1457 dev_relthread(cdev, ref);
1458 if (error != ENODEV)
1460 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
1474 * Helper function for vm_mmap. Perform sanity check specific for mmap
1475 * operations on shm file descriptors.
1478 vm_mmap_shm(struct thread *td, vm_size_t objsize,
1479 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1480 struct shmfd *shmfd, vm_ooffset_t foff, vm_object_t *objp)
1484 if ((*flagsp & MAP_SHARED) != 0 &&
1485 (*maxprotp & VM_PROT_WRITE) == 0 &&
1486 (prot & PROT_WRITE) != 0)
1489 error = mac_posixshm_check_mmap(td->td_ucred, shmfd, prot, *flagsp);
1493 error = shm_mmap(shmfd, objsize, foff, objp);
1504 * Internal version of mmap. Currently used by mmap, exec, and sys5
1505 * shared memory. Handle is either a vnode pointer or NULL for MAP_ANON.
1508 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1509 vm_prot_t maxprot, int flags,
1510 objtype_t handle_type, void *handle,
1514 vm_object_t object = NULL;
1515 struct thread *td = curthread;
1516 int docow, error, findspace, rv;
1517 boolean_t writecounted;
1522 size = round_page(size);
1524 if (map == &td->td_proc->p_vmspace->vm_map) {
1525 PROC_LOCK(td->td_proc);
1526 if (map->size + size > lim_cur(td->td_proc, RLIMIT_VMEM)) {
1527 PROC_UNLOCK(td->td_proc);
1530 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
1531 PROC_UNLOCK(td->td_proc);
1534 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
1535 if (ptoa(pmap_wired_count(map->pmap)) + size >
1536 lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
1537 racct_set_force(td->td_proc, RACCT_VMEM,
1539 PROC_UNLOCK(td->td_proc);
1542 error = racct_set(td->td_proc, RACCT_MEMLOCK,
1543 ptoa(pmap_wired_count(map->pmap)) + size);
1545 racct_set_force(td->td_proc, RACCT_VMEM,
1547 PROC_UNLOCK(td->td_proc);
1551 PROC_UNLOCK(td->td_proc);
1555 * We currently can only deal with page aligned file offsets.
1556 * The check is here rather than in the syscall because the
1557 * kernel calls this function internally for other mmaping
1558 * operations (such as in exec) and non-aligned offsets will
1559 * cause pmap inconsistencies...so we want to be sure to
1560 * disallow this in all cases.
1562 if (foff & PAGE_MASK)
1565 if ((flags & MAP_FIXED) == 0) {
1567 *addr = round_page(*addr);
1569 if (*addr != trunc_page(*addr))
1573 writecounted = FALSE;
1576 * Lookup/allocate object.
1578 switch (handle_type) {
1580 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags,
1581 handle, &foff, &object);
1584 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
1585 handle, &foff, &object, &writecounted);
1588 error = vm_mmap_shm(td, size, prot, &maxprot, &flags,
1589 handle, foff, &object);
1592 if (handle == NULL) {
1603 if (flags & MAP_ANON) {
1607 * Unnamed anonymous regions always start at 0.
1611 } else if (flags & MAP_PREFAULT_READ)
1612 docow = MAP_PREFAULT;
1614 docow = MAP_PREFAULT_PARTIAL;
1616 if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
1617 docow |= MAP_COPY_ON_WRITE;
1618 if (flags & MAP_NOSYNC)
1619 docow |= MAP_DISABLE_SYNCER;
1620 if (flags & MAP_NOCORE)
1621 docow |= MAP_DISABLE_COREDUMP;
1622 /* Shared memory is also shared with children. */
1623 if (flags & MAP_SHARED)
1624 docow |= MAP_INHERIT_SHARE;
1626 docow |= MAP_VN_WRITECOUNT;
1628 if (flags & MAP_STACK)
1629 rv = vm_map_stack(map, *addr, size, prot, maxprot,
1630 docow | MAP_STACK_GROWS_DOWN);
1632 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
1633 findspace = VMFS_SUPER_SPACE;
1634 else if ((flags & MAP_ALIGNMENT_MASK) != 0)
1635 findspace = VMFS_ALIGNED_SPACE(flags >>
1636 MAP_ALIGNMENT_SHIFT);
1638 findspace = VMFS_OPTIMAL_SPACE;
1639 rv = vm_map_find(map, object, foff, addr, size,
1641 flags & MAP_32BIT ? MAP_32BIT_MAX_ADDR :
1643 0, findspace, prot, maxprot, docow);
1645 rv = vm_map_fixed(map, object, foff, *addr, size,
1646 prot, maxprot, docow);
1648 if (rv == KERN_SUCCESS) {
1650 * If the process has requested that all future mappings
1651 * be wired, then heed this.
1653 if (map->flags & MAP_WIREFUTURE) {
1654 vm_map_wire(map, *addr, *addr + size,
1655 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ?
1656 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES));
1660 * If this mapping was accounted for in the vnode's
1661 * writecount, then undo that now.
1664 vnode_pager_release_writecount(object, 0, size);
1666 * Lose the object reference. Will destroy the
1667 * object if it's an unnamed anonymous mapping
1668 * or named anonymous without other references.
1670 vm_object_deallocate(object);
1672 return (vm_mmap_to_errno(rv));
1676 * Translate a Mach VM return code to zero on success or the appropriate errno
1680 vm_mmap_to_errno(int rv)
1686 case KERN_INVALID_ADDRESS:
1689 case KERN_PROTECTION_FAILURE: