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/capsicum.h>
52 #include <sys/kernel.h>
54 #include <sys/mutex.h>
55 #include <sys/sysproto.h>
56 #include <sys/filedesc.h>
59 #include <sys/procctl.h>
60 #include <sys/racct.h>
61 #include <sys/resource.h>
62 #include <sys/resourcevar.h>
63 #include <sys/rwlock.h>
64 #include <sys/sysctl.h>
65 #include <sys/vnode.h>
66 #include <sys/fcntl.h>
69 #include <sys/mount.h>
72 #include <sys/syscallsubr.h>
73 #include <sys/sysent.h>
74 #include <sys/vmmeter.h>
76 #include <security/mac/mac_framework.h>
79 #include <vm/vm_param.h>
81 #include <vm/vm_map.h>
82 #include <vm/vm_object.h>
83 #include <vm/vm_page.h>
84 #include <vm/vm_pager.h>
85 #include <vm/vm_pageout.h>
86 #include <vm/vm_extern.h>
87 #include <vm/vm_page.h>
88 #include <vm/vnode_pager.h>
91 #include <sys/pmckern.h>
95 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0,
96 "Do not apply RLIMIT_MEMLOCK on mlockall");
99 #define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
102 static int vm_mmap_vnode(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
103 int *, struct vnode *, vm_ooffset_t *, vm_object_t *, boolean_t *);
104 static int vm_mmap_cdev(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
105 int *, struct cdev *, vm_ooffset_t *, vm_object_t *);
106 static int vm_mmap_shm(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
107 int *, struct shmfd *, vm_ooffset_t, vm_object_t *);
109 #ifndef _SYS_SYSPROTO_H_
122 struct sbrk_args *uap;
124 /* Not yet implemented */
128 #ifndef _SYS_SYSPROTO_H_
141 struct sstk_args *uap;
143 /* Not yet implemented */
147 #if defined(COMPAT_43)
148 #ifndef _SYS_SYSPROTO_H_
149 struct getpagesize_args {
155 ogetpagesize(td, uap)
157 struct getpagesize_args *uap;
160 td->td_retval[0] = PAGE_SIZE;
163 #endif /* COMPAT_43 */
167 * Memory Map (mmap) system call. Note that the file offset
168 * and address are allowed to be NOT page aligned, though if
169 * the MAP_FIXED flag it set, both must have the same remainder
170 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
171 * page-aligned, the actual mapping starts at trunc_page(addr)
172 * and the return value is adjusted up by the page offset.
174 * Generally speaking, only character devices which are themselves
175 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise
176 * there would be no cache coherency between a descriptor and a VM mapping
177 * both to the same character device.
179 #ifndef _SYS_SYSPROTO_H_
197 struct mmap_args *uap;
200 struct pmckern_map_in pkm;
205 vm_size_t size, pageoff;
206 vm_prot_t cap_maxprot, maxprot;
208 objtype_t handle_type;
209 int align, error, flags, prot;
211 struct vmspace *vms = td->td_proc->p_vmspace;
214 addr = (vm_offset_t) uap->addr;
223 * Enforce the constraints.
224 * Mapping of length 0 is only allowed for old binaries.
225 * Anonymous mapping shall specify -1 as filedescriptor and
226 * zero position for new code. Be nice to ancient a.out
227 * binaries and correct pos for anonymous mapping, since old
228 * ld.so sometimes issues anonymous map requests with non-zero
231 if (!SV_CURPROC_FLAG(SV_AOUT)) {
232 if ((uap->len == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) ||
233 ((flags & MAP_ANON) != 0 && (uap->fd != -1 || pos != 0)))
236 if ((flags & MAP_ANON) != 0)
240 if (flags & MAP_STACK) {
241 if ((uap->fd != -1) ||
242 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
247 if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_RENAME |
248 MAP_NORESERVE | MAP_HASSEMAPHORE | MAP_STACK | MAP_NOSYNC |
249 MAP_ANON | MAP_EXCL | MAP_NOCORE | MAP_PREFAULT_READ |
253 MAP_ALIGNMENT_MASK)) != 0)
255 if ((flags & (MAP_EXCL | MAP_FIXED)) == MAP_EXCL)
257 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == (MAP_SHARED | MAP_PRIVATE))
259 if (prot != PROT_NONE &&
260 (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0)
264 * Align the file position to a page boundary,
265 * and save its page offset component.
267 pageoff = (pos & PAGE_MASK);
270 /* Adjust size for rounding (on both ends). */
271 size += pageoff; /* low end... */
272 size = (vm_size_t) round_page(size); /* hi end */
274 /* Ensure alignment is at least a page and fits in a pointer. */
275 align = flags & MAP_ALIGNMENT_MASK;
276 if (align != 0 && align != MAP_ALIGNED_SUPER &&
277 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
278 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
282 * Check for illegal addresses. Watch out for address wrap... Note
283 * that VM_*_ADDRESS are not constants due to casts (argh).
285 if (flags & MAP_FIXED) {
287 * The specified address must have the same remainder
288 * as the file offset taken modulo PAGE_SIZE, so it
289 * should be aligned after adjustment by pageoff.
292 if (addr & PAGE_MASK)
295 /* Address range must be all in user VM space. */
296 if (addr < vm_map_min(&vms->vm_map) ||
297 addr + size > vm_map_max(&vms->vm_map))
299 if (addr + size < addr)
302 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
304 } else if (flags & MAP_32BIT) {
306 * For MAP_32BIT, override the hint if it is too high and
307 * do not bother moving the mapping past the heap (since
308 * the heap is usually above 2GB).
310 if (addr + size > MAP_32BIT_MAX_ADDR)
315 * XXX for non-fixed mappings where no hint is provided or
316 * the hint would fall in the potential heap space,
317 * place it after the end of the largest possible heap.
319 * There should really be a pmap call to determine a reasonable
322 PROC_LOCK(td->td_proc);
324 (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
325 addr < round_page((vm_offset_t)vms->vm_daddr +
326 lim_max(td->td_proc, RLIMIT_DATA))))
327 addr = round_page((vm_offset_t)vms->vm_daddr +
328 lim_max(td->td_proc, RLIMIT_DATA));
329 PROC_UNLOCK(td->td_proc);
331 if (flags & MAP_ANON) {
333 * Mapping blank space is trivial.
336 handle_type = OBJT_DEFAULT;
337 maxprot = VM_PROT_ALL;
338 cap_maxprot = VM_PROT_ALL;
341 * Mapping file, get fp for validation and don't let the
342 * descriptor disappear on us if we block. Check capability
343 * rights, but also return the maximum rights to be combined
344 * with maxprot later.
346 cap_rights_init(&rights, CAP_MMAP);
347 if (prot & PROT_READ)
348 cap_rights_set(&rights, CAP_MMAP_R);
349 if ((flags & MAP_SHARED) != 0) {
350 if (prot & PROT_WRITE)
351 cap_rights_set(&rights, CAP_MMAP_W);
353 if (prot & PROT_EXEC)
354 cap_rights_set(&rights, CAP_MMAP_X);
355 error = fget_mmap(td, uap->fd, &rights, &cap_maxprot, &fp);
358 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 &&
359 td->td_proc->p_osrel >= P_OSREL_MAP_FSTRICT) {
363 if (fp->f_type == DTYPE_SHM) {
365 handle_type = OBJT_SWAP;
366 maxprot = VM_PROT_NONE;
368 /* FREAD should always be set. */
369 if (fp->f_flag & FREAD)
370 maxprot |= VM_PROT_EXECUTE | VM_PROT_READ;
371 if (fp->f_flag & FWRITE)
372 maxprot |= VM_PROT_WRITE;
375 if (fp->f_type != DTYPE_VNODE) {
379 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
380 defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
382 * POSIX shared-memory objects are defined to have
383 * kernel persistence, and are not defined to support
384 * read(2)/write(2) -- or even open(2). Thus, we can
385 * use MAP_ASYNC to trade on-disk coherence for speed.
386 * The shm_open(3) library routine turns on the FPOSIXSHM
387 * flag to request this behavior.
389 if (fp->f_flag & FPOSIXSHM)
394 * Ensure that file and memory protections are
395 * compatible. Note that we only worry about
396 * writability if mapping is shared; in this case,
397 * current and max prot are dictated by the open file.
398 * XXX use the vnode instead? Problem is: what
399 * credentials do we use for determination? What if
400 * proc does a setuid?
402 if (vp->v_mount != NULL && vp->v_mount->mnt_flag & MNT_NOEXEC)
403 maxprot = VM_PROT_NONE;
405 maxprot = VM_PROT_EXECUTE;
406 if (fp->f_flag & FREAD) {
407 maxprot |= VM_PROT_READ;
408 } else if (prot & PROT_READ) {
413 * If we are sharing potential changes (either via
414 * MAP_SHARED or via the implicit sharing of character
415 * device mappings), and we are trying to get write
416 * permission although we opened it without asking
419 if ((flags & MAP_SHARED) != 0) {
420 if ((fp->f_flag & FWRITE) != 0) {
421 maxprot |= VM_PROT_WRITE;
422 } else if ((prot & PROT_WRITE) != 0) {
426 } else if (vp->v_type != VCHR || (fp->f_flag & FWRITE) != 0) {
427 maxprot |= VM_PROT_WRITE;
428 cap_maxprot |= VM_PROT_WRITE;
431 handle_type = OBJT_VNODE;
435 maxprot &= cap_maxprot;
437 /* This relies on VM_PROT_* matching PROT_*. */
438 error = vm_mmap(&vms->vm_map, &addr, size, prot, maxprot,
439 flags, handle_type, handle, pos);
442 /* inform hwpmc(4) if an executable is being mapped */
443 if (error == 0 && handle_type == OBJT_VNODE &&
444 (prot & PROT_EXEC)) {
445 pkm.pm_file = handle;
446 pkm.pm_address = (uintptr_t) addr;
447 PMC_CALL_HOOK(td, PMC_FN_MMAP, (void *) &pkm);
451 td->td_retval[0] = (register_t) (addr + pageoff);
460 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
462 struct mmap_args oargs;
464 oargs.addr = uap->addr;
465 oargs.len = uap->len;
466 oargs.prot = uap->prot;
467 oargs.flags = uap->flags;
469 oargs.pos = uap->pos;
470 return (sys_mmap(td, &oargs));
474 #ifndef _SYS_SYSPROTO_H_
487 struct ommap_args *uap;
489 struct mmap_args nargs;
490 static const char cvtbsdprot[8] = {
494 PROT_EXEC | PROT_WRITE,
496 PROT_EXEC | PROT_READ,
497 PROT_WRITE | PROT_READ,
498 PROT_EXEC | PROT_WRITE | PROT_READ,
501 #define OMAP_ANON 0x0002
502 #define OMAP_COPY 0x0020
503 #define OMAP_SHARED 0x0010
504 #define OMAP_FIXED 0x0100
506 nargs.addr = uap->addr;
507 nargs.len = uap->len;
508 nargs.prot = cvtbsdprot[uap->prot & 0x7];
509 #ifdef COMPAT_FREEBSD32
510 #if defined(__amd64__)
511 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
513 nargs.prot |= PROT_EXEC;
517 if (uap->flags & OMAP_ANON)
518 nargs.flags |= MAP_ANON;
519 if (uap->flags & OMAP_COPY)
520 nargs.flags |= MAP_COPY;
521 if (uap->flags & OMAP_SHARED)
522 nargs.flags |= MAP_SHARED;
524 nargs.flags |= MAP_PRIVATE;
525 if (uap->flags & OMAP_FIXED)
526 nargs.flags |= MAP_FIXED;
528 nargs.pos = uap->pos;
529 return (sys_mmap(td, &nargs));
531 #endif /* COMPAT_43 */
534 #ifndef _SYS_SYSPROTO_H_
547 struct msync_args *uap;
550 vm_size_t size, pageoff;
555 addr = (vm_offset_t) uap->addr;
559 pageoff = (addr & PAGE_MASK);
562 size = (vm_size_t) round_page(size);
563 if (addr + size < addr)
566 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
569 map = &td->td_proc->p_vmspace->vm_map;
572 * Clean the pages and interpret the return value.
574 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
575 (flags & MS_INVALIDATE) != 0);
579 case KERN_INVALID_ADDRESS:
581 case KERN_INVALID_ARGUMENT:
590 #ifndef _SYS_SYSPROTO_H_
602 struct munmap_args *uap;
605 struct pmckern_map_out pkm;
606 vm_map_entry_t entry;
609 vm_size_t size, pageoff;
612 addr = (vm_offset_t) uap->addr;
617 pageoff = (addr & PAGE_MASK);
620 size = (vm_size_t) round_page(size);
621 if (addr + size < addr)
625 * Check for illegal addresses. Watch out for address wrap...
627 map = &td->td_proc->p_vmspace->vm_map;
628 if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
633 * Inform hwpmc if the address range being unmapped contains
634 * an executable region.
636 pkm.pm_address = (uintptr_t) NULL;
637 if (vm_map_lookup_entry(map, addr, &entry)) {
639 entry != &map->header && entry->start < addr + size;
640 entry = entry->next) {
641 if (vm_map_check_protection(map, entry->start,
642 entry->end, VM_PROT_EXECUTE) == TRUE) {
643 pkm.pm_address = (uintptr_t) addr;
644 pkm.pm_size = (size_t) size;
650 vm_map_delete(map, addr, addr + size);
653 /* downgrade the lock to prevent a LOR with the pmc-sx lock */
654 vm_map_lock_downgrade(map);
655 if (pkm.pm_address != (uintptr_t) NULL)
656 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
657 vm_map_unlock_read(map);
661 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */
665 #ifndef _SYS_SYSPROTO_H_
666 struct mprotect_args {
676 sys_mprotect(td, uap)
678 struct mprotect_args *uap;
681 vm_size_t size, pageoff;
684 addr = (vm_offset_t) uap->addr;
686 prot = uap->prot & VM_PROT_ALL;
688 pageoff = (addr & PAGE_MASK);
691 size = (vm_size_t) round_page(size);
692 if (addr + size < addr)
695 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr,
696 addr + size, prot, FALSE)) {
699 case KERN_PROTECTION_FAILURE:
701 case KERN_RESOURCE_SHORTAGE:
707 #ifndef _SYS_SYSPROTO_H_
708 struct minherit_args {
718 sys_minherit(td, uap)
720 struct minherit_args *uap;
723 vm_size_t size, pageoff;
724 vm_inherit_t inherit;
726 addr = (vm_offset_t)uap->addr;
728 inherit = uap->inherit;
730 pageoff = (addr & PAGE_MASK);
733 size = (vm_size_t) round_page(size);
734 if (addr + size < addr)
737 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr,
738 addr + size, inherit)) {
741 case KERN_PROTECTION_FAILURE:
747 #ifndef _SYS_SYSPROTO_H_
748 struct madvise_args {
761 struct madvise_args *uap;
763 vm_offset_t start, end;
768 * Check for our special case, advising the swap pager we are
771 if (uap->behav == MADV_PROTECT) {
773 return (kern_procctl(td, P_PID, td->td_proc->p_pid,
774 PROC_SPROTECT, &flags));
778 * Check for illegal behavior
780 if (uap->behav < 0 || uap->behav > MADV_CORE)
783 * Check for illegal addresses. Watch out for address wrap... Note
784 * that VM_*_ADDRESS are not constants due to casts (argh).
786 map = &td->td_proc->p_vmspace->vm_map;
787 if ((vm_offset_t)uap->addr < vm_map_min(map) ||
788 (vm_offset_t)uap->addr + uap->len > vm_map_max(map))
790 if (((vm_offset_t) uap->addr + uap->len) < (vm_offset_t) uap->addr)
794 * Since this routine is only advisory, we default to conservative
797 start = trunc_page((vm_offset_t) uap->addr);
798 end = round_page((vm_offset_t) uap->addr + uap->len);
800 if (vm_map_madvise(map, start, end, uap->behav))
805 #ifndef _SYS_SYSPROTO_H_
806 struct mincore_args {
819 struct mincore_args *uap;
821 vm_offset_t addr, first_addr;
822 vm_offset_t end, cend;
827 int vecindex, lastvecindex;
828 vm_map_entry_t current;
829 vm_map_entry_t entry;
831 vm_paddr_t locked_pa;
835 unsigned int timestamp;
839 * Make sure that the addresses presented are valid for user
842 first_addr = addr = trunc_page((vm_offset_t) uap->addr);
843 end = addr + (vm_size_t)round_page(uap->len);
844 map = &td->td_proc->p_vmspace->vm_map;
845 if (end > vm_map_max(map) || end < addr)
849 * Address of byte vector
853 pmap = vmspace_pmap(td->td_proc->p_vmspace);
855 vm_map_lock_read(map);
857 timestamp = map->timestamp;
859 if (!vm_map_lookup_entry(map, addr, &entry)) {
860 vm_map_unlock_read(map);
865 * Do this on a map entry basis so that if the pages are not
866 * in the current processes address space, we can easily look
867 * up the pages elsewhere.
870 for (current = entry;
871 (current != &map->header) && (current->start < end);
872 current = current->next) {
875 * check for contiguity
877 if (current->end < end &&
878 (entry->next == &map->header ||
879 current->next->start > current->end)) {
880 vm_map_unlock_read(map);
885 * ignore submaps (for now) or null objects
887 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
888 current->object.vm_object == NULL)
892 * limit this scan to the current map entry and the
893 * limits for the mincore call
895 if (addr < current->start)
896 addr = current->start;
902 * scan this entry one page at a time
904 while (addr < cend) {
906 * Check pmap first, it is likely faster, also
907 * it can provide info as to whether we are the
908 * one referencing or modifying the page.
914 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa);
915 if (locked_pa != 0) {
917 * The page is mapped by this process but not
918 * both accessed and modified. It is also
919 * managed. Acquire the object lock so that
920 * other mappings might be examined.
922 m = PHYS_TO_VM_PAGE(locked_pa);
923 if (m->object != object) {
925 VM_OBJECT_WUNLOCK(object);
927 locked = VM_OBJECT_TRYWLOCK(object);
930 VM_OBJECT_WLOCK(object);
936 KASSERT(m->valid == VM_PAGE_BITS_ALL,
937 ("mincore: page %p is mapped but invalid",
939 } else if (mincoreinfo == 0) {
941 * The page is not mapped by this process. If
942 * the object implements managed pages, then
943 * determine if the page is resident so that
944 * the mappings might be examined.
946 if (current->object.vm_object != object) {
948 VM_OBJECT_WUNLOCK(object);
949 object = current->object.vm_object;
950 VM_OBJECT_WLOCK(object);
952 if (object->type == OBJT_DEFAULT ||
953 object->type == OBJT_SWAP ||
954 object->type == OBJT_VNODE) {
955 pindex = OFF_TO_IDX(current->offset +
956 (addr - current->start));
957 m = vm_page_lookup(object, pindex);
959 vm_page_is_cached(object, pindex))
960 mincoreinfo = MINCORE_INCORE;
961 if (m != NULL && m->valid == 0)
964 mincoreinfo = MINCORE_INCORE;
968 /* Examine other mappings to the page. */
969 if (m->dirty == 0 && pmap_is_modified(m))
972 mincoreinfo |= MINCORE_MODIFIED_OTHER;
974 * The first test for PGA_REFERENCED is an
975 * optimization. The second test is
976 * required because a concurrent pmap
977 * operation could clear the last reference
978 * and set PGA_REFERENCED before the call to
979 * pmap_is_referenced().
981 if ((m->aflags & PGA_REFERENCED) != 0 ||
982 pmap_is_referenced(m) ||
983 (m->aflags & PGA_REFERENCED) != 0)
984 mincoreinfo |= MINCORE_REFERENCED_OTHER;
987 VM_OBJECT_WUNLOCK(object);
990 * subyte may page fault. In case it needs to modify
991 * the map, we release the lock.
993 vm_map_unlock_read(map);
996 * calculate index into user supplied byte vector
998 vecindex = OFF_TO_IDX(addr - first_addr);
1001 * If we have skipped map entries, we need to make sure that
1002 * the byte vector is zeroed for those skipped entries.
1004 while ((lastvecindex + 1) < vecindex) {
1006 error = subyte(vec + lastvecindex, 0);
1014 * Pass the page information to the user
1016 error = subyte(vec + vecindex, mincoreinfo);
1023 * If the map has changed, due to the subyte, the previous
1024 * output may be invalid.
1026 vm_map_lock_read(map);
1027 if (timestamp != map->timestamp)
1030 lastvecindex = vecindex;
1036 * subyte may page fault. In case it needs to modify
1037 * the map, we release the lock.
1039 vm_map_unlock_read(map);
1042 * Zero the last entries in the byte vector.
1044 vecindex = OFF_TO_IDX(end - first_addr);
1045 while ((lastvecindex + 1) < vecindex) {
1047 error = subyte(vec + lastvecindex, 0);
1055 * If the map has changed, due to the subyte, the previous
1056 * output may be invalid.
1058 vm_map_lock_read(map);
1059 if (timestamp != map->timestamp)
1061 vm_map_unlock_read(map);
1066 #ifndef _SYS_SYSPROTO_H_
1078 struct mlock_args *uap;
1081 return (vm_mlock(td->td_proc, td->td_ucred, uap->addr, uap->len));
1085 vm_mlock(struct proc *proc, struct ucred *cred, const void *addr0, size_t len)
1087 vm_offset_t addr, end, last, start;
1088 vm_size_t npages, size;
1090 unsigned long nsize;
1093 error = priv_check_cred(cred, PRIV_VM_MLOCK, 0);
1096 addr = (vm_offset_t)addr0;
1099 start = trunc_page(addr);
1100 end = round_page(last);
1101 if (last < addr || end < addr)
1103 npages = atop(end - start);
1104 if (npages > vm_page_max_wired)
1106 map = &proc->p_vmspace->vm_map;
1108 nsize = ptoa(npages + pmap_wired_count(map->pmap));
1109 if (nsize > lim_cur(proc, RLIMIT_MEMLOCK)) {
1114 if (npages + vm_cnt.v_wire_count > vm_page_max_wired)
1118 error = racct_set(proc, RACCT_MEMLOCK, nsize);
1123 error = vm_map_wire(map, start, end,
1124 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1126 if (error != KERN_SUCCESS) {
1128 racct_set(proc, RACCT_MEMLOCK,
1129 ptoa(pmap_wired_count(map->pmap)));
1133 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1136 #ifndef _SYS_SYSPROTO_H_
1137 struct mlockall_args {
1146 sys_mlockall(td, uap)
1148 struct mlockall_args *uap;
1153 map = &td->td_proc->p_vmspace->vm_map;
1154 error = priv_check(td, PRIV_VM_MLOCK);
1158 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
1162 * If wiring all pages in the process would cause it to exceed
1163 * a hard resource limit, return ENOMEM.
1165 if (!old_mlock && uap->how & MCL_CURRENT) {
1166 PROC_LOCK(td->td_proc);
1167 if (map->size > lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
1168 PROC_UNLOCK(td->td_proc);
1171 PROC_UNLOCK(td->td_proc);
1174 PROC_LOCK(td->td_proc);
1175 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
1176 PROC_UNLOCK(td->td_proc);
1181 if (uap->how & MCL_FUTURE) {
1183 vm_map_modflags(map, MAP_WIREFUTURE, 0);
1188 if (uap->how & MCL_CURRENT) {
1190 * P1003.1-2001 mandates that all currently mapped pages
1191 * will be memory resident and locked (wired) upon return
1192 * from mlockall(). vm_map_wire() will wire pages, by
1193 * calling vm_fault_wire() for each page in the region.
1195 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
1196 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1197 error = (error == KERN_SUCCESS ? 0 : EAGAIN);
1200 if (error != KERN_SUCCESS) {
1201 PROC_LOCK(td->td_proc);
1202 racct_set(td->td_proc, RACCT_MEMLOCK,
1203 ptoa(pmap_wired_count(map->pmap)));
1204 PROC_UNLOCK(td->td_proc);
1211 #ifndef _SYS_SYSPROTO_H_
1212 struct munlockall_args {
1221 sys_munlockall(td, uap)
1223 struct munlockall_args *uap;
1228 map = &td->td_proc->p_vmspace->vm_map;
1229 error = priv_check(td, PRIV_VM_MUNLOCK);
1233 /* Clear the MAP_WIREFUTURE flag from this vm_map. */
1235 vm_map_modflags(map, 0, MAP_WIREFUTURE);
1238 /* Forcibly unwire all pages. */
1239 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
1240 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1242 if (error == KERN_SUCCESS) {
1243 PROC_LOCK(td->td_proc);
1244 racct_set(td->td_proc, RACCT_MEMLOCK, 0);
1245 PROC_UNLOCK(td->td_proc);
1252 #ifndef _SYS_SYSPROTO_H_
1253 struct munlock_args {
1262 sys_munlock(td, uap)
1264 struct munlock_args *uap;
1266 vm_offset_t addr, end, last, start;
1273 error = priv_check(td, PRIV_VM_MUNLOCK);
1276 addr = (vm_offset_t)uap->addr;
1279 start = trunc_page(addr);
1280 end = round_page(last);
1281 if (last < addr || end < addr)
1283 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
1284 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1286 if (error == KERN_SUCCESS) {
1287 PROC_LOCK(td->td_proc);
1288 map = &td->td_proc->p_vmspace->vm_map;
1289 racct_set(td->td_proc, RACCT_MEMLOCK,
1290 ptoa(pmap_wired_count(map->pmap)));
1291 PROC_UNLOCK(td->td_proc);
1294 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1300 * Helper function for vm_mmap. Perform sanity check specific for mmap
1301 * operations on vnodes.
1303 * For VCHR vnodes, the vnode lock is held over the call to
1304 * vm_mmap_cdev() to keep vp->v_rdev valid.
1307 vm_mmap_vnode(struct thread *td, vm_size_t objsize,
1308 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1309 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp,
1310 boolean_t *writecounted)
1317 int error, flags, locktype;
1320 cred = td->td_ucred;
1321 if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED))
1322 locktype = LK_EXCLUSIVE;
1324 locktype = LK_SHARED;
1325 if ((error = vget(vp, locktype, td)) != 0)
1330 if (vp->v_type == VREG) {
1332 * Get the proper underlying object
1338 if (obj->type == OBJT_VNODE && obj->handle != vp) {
1340 vp = (struct vnode *)obj->handle;
1342 * Bypass filesystems obey the mpsafety of the
1343 * underlying fs. Tmpfs never bypasses.
1345 error = vget(vp, locktype, td);
1349 if (locktype == LK_EXCLUSIVE) {
1350 *writecounted = TRUE;
1351 vnode_pager_update_writecount(obj, 0, objsize);
1353 } else if (vp->v_type == VCHR) {
1354 error = vm_mmap_cdev(td, objsize, prot, maxprotp, flagsp,
1355 vp->v_rdev, foffp, objp);
1363 if ((error = VOP_GETATTR(vp, &va, cred)))
1366 error = mac_vnode_check_mmap(cred, vp, prot, flags);
1370 if ((flags & MAP_SHARED) != 0) {
1371 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
1372 if (prot & PROT_WRITE) {
1376 *maxprotp &= ~VM_PROT_WRITE;
1380 * If it is a regular file without any references
1381 * we do not need to sync it.
1382 * Adjust object size to be the size of actual file.
1384 objsize = round_page(va.va_size);
1385 if (va.va_nlink == 0)
1386 flags |= MAP_NOSYNC;
1387 if (obj->type == OBJT_VNODE)
1388 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
1391 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP,
1392 ("wrong object type"));
1393 vm_object_reference(obj);
1403 vfs_mark_atime(vp, cred);
1406 if (error != 0 && *writecounted) {
1407 *writecounted = FALSE;
1408 vnode_pager_update_writecount(obj, objsize, 0);
1419 * Helper function for vm_mmap. Perform sanity check specific for mmap
1420 * operations on cdevs.
1423 vm_mmap_cdev(struct thread *td, vm_size_t objsize,
1424 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1425 struct cdev *cdev, vm_ooffset_t *foff, vm_object_t *objp)
1429 int error, flags, ref;
1433 dsw = dev_refthread(cdev, &ref);
1436 if (dsw->d_flags & D_MMAP_ANON) {
1437 dev_relthread(cdev, ref);
1438 *maxprotp = VM_PROT_ALL;
1439 *flagsp |= MAP_ANON;
1443 * cdevs do not provide private mappings of any kind.
1445 if ((*maxprotp & VM_PROT_WRITE) == 0 &&
1446 (prot & PROT_WRITE) != 0) {
1447 dev_relthread(cdev, ref);
1450 if (flags & (MAP_PRIVATE|MAP_COPY)) {
1451 dev_relthread(cdev, ref);
1455 * Force device mappings to be shared.
1457 flags |= MAP_SHARED;
1459 error = mac_cdev_check_mmap(td->td_ucred, cdev, prot);
1461 dev_relthread(cdev, ref);
1466 * First, try d_mmap_single(). If that is not implemented
1467 * (returns ENODEV), fall back to using the device pager.
1468 * Note that d_mmap_single() must return a reference to the
1469 * object (it needs to bump the reference count of the object
1470 * it returns somehow).
1472 * XXX assumes VM_PROT_* == PROT_*
1474 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
1475 dev_relthread(cdev, ref);
1476 if (error != ENODEV)
1478 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
1492 * Helper function for vm_mmap. Perform sanity check specific for mmap
1493 * operations on shm file descriptors.
1496 vm_mmap_shm(struct thread *td, vm_size_t objsize,
1497 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1498 struct shmfd *shmfd, vm_ooffset_t foff, vm_object_t *objp)
1502 if ((*flagsp & MAP_SHARED) != 0 &&
1503 (*maxprotp & VM_PROT_WRITE) == 0 &&
1504 (prot & PROT_WRITE) != 0)
1507 error = mac_posixshm_check_mmap(td->td_ucred, shmfd, prot, *flagsp);
1511 error = shm_mmap(shmfd, objsize, foff, objp);
1522 * Internal version of mmap. Currently used by mmap, exec, and sys5
1523 * shared memory. Handle is either a vnode pointer or NULL for MAP_ANON.
1526 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1527 vm_prot_t maxprot, int flags,
1528 objtype_t handle_type, void *handle,
1532 vm_object_t object = NULL;
1533 struct thread *td = curthread;
1534 int docow, error, findspace, rv;
1535 boolean_t writecounted;
1540 size = round_page(size);
1542 if (map == &td->td_proc->p_vmspace->vm_map) {
1543 PROC_LOCK(td->td_proc);
1544 if (map->size + size > lim_cur(td->td_proc, RLIMIT_VMEM)) {
1545 PROC_UNLOCK(td->td_proc);
1548 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
1549 PROC_UNLOCK(td->td_proc);
1552 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
1553 if (ptoa(pmap_wired_count(map->pmap)) + size >
1554 lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
1555 racct_set_force(td->td_proc, RACCT_VMEM,
1557 PROC_UNLOCK(td->td_proc);
1560 error = racct_set(td->td_proc, RACCT_MEMLOCK,
1561 ptoa(pmap_wired_count(map->pmap)) + size);
1563 racct_set_force(td->td_proc, RACCT_VMEM,
1565 PROC_UNLOCK(td->td_proc);
1569 PROC_UNLOCK(td->td_proc);
1573 * We currently can only deal with page aligned file offsets.
1574 * The check is here rather than in the syscall because the
1575 * kernel calls this function internally for other mmaping
1576 * operations (such as in exec) and non-aligned offsets will
1577 * cause pmap inconsistencies...so we want to be sure to
1578 * disallow this in all cases.
1580 if (foff & PAGE_MASK)
1583 if ((flags & MAP_FIXED) == 0) {
1585 *addr = round_page(*addr);
1587 if (*addr != trunc_page(*addr))
1591 writecounted = FALSE;
1594 * Lookup/allocate object.
1596 switch (handle_type) {
1598 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags,
1599 handle, &foff, &object);
1602 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
1603 handle, &foff, &object, &writecounted);
1606 error = vm_mmap_shm(td, size, prot, &maxprot, &flags,
1607 handle, foff, &object);
1610 if (handle == NULL) {
1621 if (flags & MAP_ANON) {
1625 * Unnamed anonymous regions always start at 0.
1629 } else if (flags & MAP_PREFAULT_READ)
1630 docow = MAP_PREFAULT;
1632 docow = MAP_PREFAULT_PARTIAL;
1634 if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
1635 docow |= MAP_COPY_ON_WRITE;
1636 if (flags & MAP_NOSYNC)
1637 docow |= MAP_DISABLE_SYNCER;
1638 if (flags & MAP_NOCORE)
1639 docow |= MAP_DISABLE_COREDUMP;
1640 /* Shared memory is also shared with children. */
1641 if (flags & MAP_SHARED)
1642 docow |= MAP_INHERIT_SHARE;
1644 docow |= MAP_VN_WRITECOUNT;
1645 if (flags & MAP_STACK) {
1648 docow |= MAP_STACK_GROWS_DOWN;
1650 if ((flags & MAP_EXCL) != 0)
1651 docow |= MAP_CHECK_EXCL;
1654 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
1655 findspace = VMFS_SUPER_SPACE;
1656 else if ((flags & MAP_ALIGNMENT_MASK) != 0)
1657 findspace = VMFS_ALIGNED_SPACE(flags >>
1658 MAP_ALIGNMENT_SHIFT);
1660 findspace = VMFS_OPTIMAL_SPACE;
1661 rv = vm_map_find(map, object, foff, addr, size,
1663 flags & MAP_32BIT ? MAP_32BIT_MAX_ADDR :
1665 0, findspace, prot, maxprot, docow);
1667 rv = vm_map_fixed(map, object, foff, *addr, size,
1668 prot, maxprot, docow);
1671 if (rv == KERN_SUCCESS) {
1673 * If the process has requested that all future mappings
1674 * be wired, then heed this.
1676 if (map->flags & MAP_WIREFUTURE) {
1677 vm_map_wire(map, *addr, *addr + size,
1678 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ?
1679 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES));
1683 * If this mapping was accounted for in the vnode's
1684 * writecount, then undo that now.
1687 vnode_pager_release_writecount(object, 0, size);
1689 * Lose the object reference. Will destroy the
1690 * object if it's an unnamed anonymous mapping
1691 * or named anonymous without other references.
1693 vm_object_deallocate(object);
1695 return (vm_mmap_to_errno(rv));
1699 * Translate a Mach VM return code to zero on success or the appropriate errno
1703 vm_mmap_to_errno(int rv)
1709 case KERN_INVALID_ADDRESS:
1712 case KERN_PROTECTION_FAILURE: