2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1991, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
38 * @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
42 * Mapped file (mmap) interface to VM
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
48 #include "opt_hwpmc_hooks.h"
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/capsicum.h>
54 #include <sys/kernel.h>
56 #include <sys/mutex.h>
57 #include <sys/sysproto.h>
58 #include <sys/filedesc.h>
61 #include <sys/procctl.h>
62 #include <sys/racct.h>
63 #include <sys/resource.h>
64 #include <sys/resourcevar.h>
65 #include <sys/rwlock.h>
66 #include <sys/sysctl.h>
67 #include <sys/vnode.h>
68 #include <sys/fcntl.h>
71 #include <sys/mount.h>
74 #include <sys/syscallsubr.h>
75 #include <sys/sysent.h>
76 #include <sys/vmmeter.h>
77 #if defined(__amd64__) || defined(__i386__) /* for i386_read_exec */
78 #include <machine/md_var.h>
81 #include <security/audit/audit.h>
82 #include <security/mac/mac_framework.h>
85 #include <vm/vm_param.h>
87 #include <vm/vm_map.h>
88 #include <vm/vm_object.h>
89 #include <vm/vm_page.h>
90 #include <vm/vm_pager.h>
91 #include <vm/vm_pageout.h>
92 #include <vm/vm_extern.h>
93 #include <vm/vm_page.h>
94 #include <vm/vnode_pager.h>
97 #include <sys/pmckern.h>
101 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0,
102 "Do not apply RLIMIT_MEMLOCK on mlockall");
103 static int mincore_mapped = 1;
104 SYSCTL_INT(_vm, OID_AUTO, mincore_mapped, CTLFLAG_RWTUN, &mincore_mapped, 0,
105 "mincore reports mappings, not residency");
108 #define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
111 #ifndef _SYS_SYSPROTO_H_
118 sys_sbrk(struct thread *td, struct sbrk_args *uap)
120 /* Not yet implemented */
124 #ifndef _SYS_SYSPROTO_H_
131 sys_sstk(struct thread *td, struct sstk_args *uap)
133 /* Not yet implemented */
137 #if defined(COMPAT_43)
139 ogetpagesize(struct thread *td, struct ogetpagesize_args *uap)
142 td->td_retval[0] = PAGE_SIZE;
145 #endif /* COMPAT_43 */
149 * Memory Map (mmap) system call. Note that the file offset
150 * and address are allowed to be NOT page aligned, though if
151 * the MAP_FIXED flag it set, both must have the same remainder
152 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
153 * page-aligned, the actual mapping starts at trunc_page(addr)
154 * and the return value is adjusted up by the page offset.
156 * Generally speaking, only character devices which are themselves
157 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise
158 * there would be no cache coherency between a descriptor and a VM mapping
159 * both to the same character device.
161 #ifndef _SYS_SYSPROTO_H_
174 sys_mmap(struct thread *td, struct mmap_args *uap)
177 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, uap->prot,
178 uap->flags, uap->fd, uap->pos));
182 kern_mmap(struct thread *td, uintptr_t addr0, size_t len, int prot, int flags,
188 vm_size_t pageoff, size;
189 vm_prot_t cap_maxprot;
193 vms = td->td_proc->p_vmspace;
199 * Ignore old flags that used to be defined but did not do anything.
201 flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040);
204 * Enforce the constraints.
205 * Mapping of length 0 is only allowed for old binaries.
206 * Anonymous mapping shall specify -1 as filedescriptor and
207 * zero position for new code. Be nice to ancient a.out
208 * binaries and correct pos for anonymous mapping, since old
209 * ld.so sometimes issues anonymous map requests with non-zero
212 if (!SV_CURPROC_FLAG(SV_AOUT)) {
213 if ((len == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) ||
214 ((flags & MAP_ANON) != 0 && (fd != -1 || pos != 0)))
217 if ((flags & MAP_ANON) != 0)
221 if (flags & MAP_STACK) {
223 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
228 if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE |
229 MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE |
230 MAP_PREFAULT_READ | MAP_GUARD |
234 MAP_ALIGNMENT_MASK)) != 0)
236 if ((flags & (MAP_EXCL | MAP_FIXED)) == MAP_EXCL)
238 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == (MAP_SHARED | MAP_PRIVATE))
240 if (prot != PROT_NONE &&
241 (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0)
243 if ((flags & MAP_GUARD) != 0 && (prot != PROT_NONE || fd != -1 ||
244 pos != 0 || (flags & ~(MAP_FIXED | MAP_GUARD | MAP_EXCL |
248 MAP_ALIGNMENT_MASK)) != 0))
252 * Align the file position to a page boundary,
253 * and save its page offset component.
255 pageoff = (pos & PAGE_MASK);
258 /* Compute size from len by rounding (on both ends). */
259 size = len + pageoff; /* low end... */
260 size = round_page(size); /* hi end */
261 /* Check for rounding up to zero. */
265 /* Ensure alignment is at least a page and fits in a pointer. */
266 align = flags & MAP_ALIGNMENT_MASK;
267 if (align != 0 && align != MAP_ALIGNED_SUPER &&
268 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
269 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
273 * Check for illegal addresses. Watch out for address wrap... Note
274 * that VM_*_ADDRESS are not constants due to casts (argh).
276 if (flags & MAP_FIXED) {
278 * The specified address must have the same remainder
279 * as the file offset taken modulo PAGE_SIZE, so it
280 * should be aligned after adjustment by pageoff.
283 if (addr & PAGE_MASK)
286 /* Address range must be all in user VM space. */
287 if (addr < vm_map_min(&vms->vm_map) ||
288 addr + size > vm_map_max(&vms->vm_map))
290 if (addr + size < addr)
293 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
295 } else if (flags & MAP_32BIT) {
297 * For MAP_32BIT, override the hint if it is too high and
298 * do not bother moving the mapping past the heap (since
299 * the heap is usually above 2GB).
301 if (addr + size > MAP_32BIT_MAX_ADDR)
306 * XXX for non-fixed mappings where no hint is provided or
307 * the hint would fall in the potential heap space,
308 * place it after the end of the largest possible heap.
310 * There should really be a pmap call to determine a reasonable
314 (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
315 addr < round_page((vm_offset_t)vms->vm_daddr +
316 lim_max(td, RLIMIT_DATA))))
317 addr = round_page((vm_offset_t)vms->vm_daddr +
318 lim_max(td, RLIMIT_DATA));
322 * Return success without mapping anything for old
323 * binaries that request a page-aligned mapping of
324 * length 0. For modern binaries, this function
325 * returns an error earlier.
328 } else if ((flags & MAP_GUARD) != 0) {
329 error = vm_mmap_object(&vms->vm_map, &addr, size, VM_PROT_NONE,
330 VM_PROT_NONE, flags, NULL, pos, FALSE, td);
331 } else if ((flags & MAP_ANON) != 0) {
333 * Mapping blank space is trivial.
335 * This relies on VM_PROT_* matching PROT_*.
337 error = vm_mmap_object(&vms->vm_map, &addr, size, prot,
338 VM_PROT_ALL, flags, NULL, pos, FALSE, td);
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, fd, &rights, &cap_maxprot, &fp);
358 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 &&
359 td->td_proc->p_osrel >= P_OSREL_MAP_FSTRICT) {
364 /* This relies on VM_PROT_* matching PROT_*. */
365 error = fo_mmap(fp, &vms->vm_map, &addr, size, prot,
366 cap_maxprot, flags, pos, td);
370 td->td_retval[0] = (register_t) (addr + pageoff);
378 #if defined(COMPAT_FREEBSD6)
380 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
383 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, uap->prot,
384 uap->flags, uap->fd, uap->pos));
389 #ifndef _SYS_SYSPROTO_H_
400 ommap(struct thread *td, struct ommap_args *uap)
402 static const char cvtbsdprot[8] = {
406 PROT_EXEC | PROT_WRITE,
408 PROT_EXEC | PROT_READ,
409 PROT_WRITE | PROT_READ,
410 PROT_EXEC | PROT_WRITE | PROT_READ,
414 #define OMAP_ANON 0x0002
415 #define OMAP_COPY 0x0020
416 #define OMAP_SHARED 0x0010
417 #define OMAP_FIXED 0x0100
419 prot = cvtbsdprot[uap->prot & 0x7];
420 #if (defined(COMPAT_FREEBSD32) && defined(__amd64__)) || defined(__i386__)
421 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
426 if (uap->flags & OMAP_ANON)
428 if (uap->flags & OMAP_COPY)
430 if (uap->flags & OMAP_SHARED)
433 flags |= MAP_PRIVATE;
434 if (uap->flags & OMAP_FIXED)
436 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, prot, flags,
439 #endif /* COMPAT_43 */
442 #ifndef _SYS_SYSPROTO_H_
450 sys_msync(struct thread *td, struct msync_args *uap)
453 return (kern_msync(td, (uintptr_t)uap->addr, uap->len, uap->flags));
457 kern_msync(struct thread *td, uintptr_t addr0, size_t size, int flags)
465 pageoff = (addr & PAGE_MASK);
468 size = (vm_size_t) round_page(size);
469 if (addr + size < addr)
472 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
475 map = &td->td_proc->p_vmspace->vm_map;
478 * Clean the pages and interpret the return value.
480 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
481 (flags & MS_INVALIDATE) != 0);
485 case KERN_INVALID_ADDRESS:
487 case KERN_INVALID_ARGUMENT:
496 #ifndef _SYS_SYSPROTO_H_
503 sys_munmap(struct thread *td, struct munmap_args *uap)
506 return (kern_munmap(td, (uintptr_t)uap->addr, uap->len));
510 kern_munmap(struct thread *td, uintptr_t addr0, size_t size)
513 struct pmckern_map_out pkm;
514 vm_map_entry_t entry;
525 pageoff = (addr & PAGE_MASK);
528 size = (vm_size_t) round_page(size);
529 if (addr + size < addr)
533 * Check for illegal addresses. Watch out for address wrap...
535 map = &td->td_proc->p_vmspace->vm_map;
536 if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
541 if (PMC_HOOK_INSTALLED(PMC_FN_MUNMAP)) {
544 * Inform hwpmc if the address range being unmapped contains
545 * an executable region.
547 pkm.pm_address = (uintptr_t) NULL;
548 if (vm_map_lookup_entry(map, addr, &entry)) {
549 for (; entry->start < addr + size;
550 entry = entry->next) {
551 if (vm_map_check_protection(map, entry->start,
552 entry->end, VM_PROT_EXECUTE) == TRUE) {
553 pkm.pm_address = (uintptr_t) addr;
554 pkm.pm_size = (size_t) size;
561 vm_map_delete(map, addr, addr + size);
564 if (__predict_false(pmc_handled)) {
565 /* downgrade the lock to prevent a LOR with the pmc-sx lock */
566 vm_map_lock_downgrade(map);
567 if (pkm.pm_address != (uintptr_t) NULL)
568 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
569 vm_map_unlock_read(map);
574 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */
578 #ifndef _SYS_SYSPROTO_H_
579 struct mprotect_args {
586 sys_mprotect(struct thread *td, struct mprotect_args *uap)
589 return (kern_mprotect(td, (uintptr_t)uap->addr, uap->len, uap->prot));
593 kern_mprotect(struct thread *td, uintptr_t addr0, size_t size, int prot)
599 prot = (prot & VM_PROT_ALL);
600 pageoff = (addr & PAGE_MASK);
603 size = (vm_size_t) round_page(size);
604 #ifdef COMPAT_FREEBSD32
605 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
606 if (((addr + size) & 0xffffffff) < addr)
610 if (addr + size < addr)
613 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr,
614 addr + size, prot, FALSE)) {
617 case KERN_PROTECTION_FAILURE:
619 case KERN_RESOURCE_SHORTAGE:
625 #ifndef _SYS_SYSPROTO_H_
626 struct minherit_args {
633 sys_minherit(struct thread *td, struct minherit_args *uap)
636 vm_size_t size, pageoff;
637 vm_inherit_t inherit;
639 addr = (vm_offset_t)uap->addr;
641 inherit = uap->inherit;
643 pageoff = (addr & PAGE_MASK);
646 size = (vm_size_t) round_page(size);
647 if (addr + size < addr)
650 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr,
651 addr + size, inherit)) {
654 case KERN_PROTECTION_FAILURE:
660 #ifndef _SYS_SYSPROTO_H_
661 struct madvise_args {
669 sys_madvise(struct thread *td, struct madvise_args *uap)
672 return (kern_madvise(td, (uintptr_t)uap->addr, uap->len, uap->behav));
676 kern_madvise(struct thread *td, uintptr_t addr0, size_t len, int behav)
679 vm_offset_t addr, end, start;
683 * Check for our special case, advising the swap pager we are
686 if (behav == MADV_PROTECT) {
688 return (kern_procctl(td, P_PID, td->td_proc->p_pid,
689 PROC_SPROTECT, &flags));
693 * Check for illegal addresses. Watch out for address wrap... Note
694 * that VM_*_ADDRESS are not constants due to casts (argh).
696 map = &td->td_proc->p_vmspace->vm_map;
698 if (addr < vm_map_min(map) || addr + len > vm_map_max(map))
700 if ((addr + len) < addr)
704 * Since this routine is only advisory, we default to conservative
707 start = trunc_page(addr);
708 end = round_page(addr + len);
711 * vm_map_madvise() checks for illegal values of behav.
713 return (vm_map_madvise(map, start, end, behav));
716 #ifndef _SYS_SYSPROTO_H_
717 struct mincore_args {
725 sys_mincore(struct thread *td, struct mincore_args *uap)
728 return (kern_mincore(td, (uintptr_t)uap->addr, uap->len, uap->vec));
732 kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec)
734 vm_offset_t addr, first_addr;
735 vm_offset_t end, cend;
739 int vecindex, lastvecindex;
740 vm_map_entry_t current;
741 vm_map_entry_t entry;
743 vm_paddr_t locked_pa;
747 unsigned int timestamp;
751 * Make sure that the addresses presented are valid for user
754 first_addr = addr = trunc_page(addr0);
755 end = addr + (vm_size_t)round_page(len);
756 map = &td->td_proc->p_vmspace->vm_map;
757 if (end > vm_map_max(map) || end < addr)
760 pmap = vmspace_pmap(td->td_proc->p_vmspace);
762 vm_map_lock_read(map);
764 timestamp = map->timestamp;
766 if (!vm_map_lookup_entry(map, addr, &entry)) {
767 vm_map_unlock_read(map);
772 * Do this on a map entry basis so that if the pages are not
773 * in the current processes address space, we can easily look
774 * up the pages elsewhere.
777 for (current = entry; current->start < end; current = current->next) {
780 * check for contiguity
782 if (current->end < end && current->next->start > current->end) {
783 vm_map_unlock_read(map);
788 * ignore submaps (for now) or null objects
790 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
791 current->object.vm_object == NULL)
795 * limit this scan to the current map entry and the
796 * limits for the mincore call
798 if (addr < current->start)
799 addr = current->start;
805 * scan this entry one page at a time
807 while (addr < cend) {
809 * Check pmap first, it is likely faster, also
810 * it can provide info as to whether we are the
811 * one referencing or modifying the page.
817 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa);
818 if (mincore_mapped) {
820 * We only care about this pmap's
821 * mapping of the page, if any.
823 if (locked_pa != 0) {
824 vm_page_unlock(PHYS_TO_VM_PAGE(
827 } else if (locked_pa != 0) {
829 * The page is mapped by this process but not
830 * both accessed and modified. It is also
831 * managed. Acquire the object lock so that
832 * other mappings might be examined.
834 m = PHYS_TO_VM_PAGE(locked_pa);
835 if (m->object != object) {
837 VM_OBJECT_WUNLOCK(object);
839 locked = VM_OBJECT_TRYWLOCK(object);
842 VM_OBJECT_WLOCK(object);
848 KASSERT(m->valid == VM_PAGE_BITS_ALL,
849 ("mincore: page %p is mapped but invalid",
851 } else if (mincoreinfo == 0) {
853 * The page is not mapped by this process. If
854 * the object implements managed pages, then
855 * determine if the page is resident so that
856 * the mappings might be examined.
858 if (current->object.vm_object != object) {
860 VM_OBJECT_WUNLOCK(object);
861 object = current->object.vm_object;
862 VM_OBJECT_WLOCK(object);
864 if (object->type == OBJT_DEFAULT ||
865 object->type == OBJT_SWAP ||
866 object->type == OBJT_VNODE) {
867 pindex = OFF_TO_IDX(current->offset +
868 (addr - current->start));
869 m = vm_page_lookup(object, pindex);
870 if (m != NULL && m->valid == 0)
873 mincoreinfo = MINCORE_INCORE;
877 /* Examine other mappings to the page. */
878 if (m->dirty == 0 && pmap_is_modified(m))
881 mincoreinfo |= MINCORE_MODIFIED_OTHER;
883 * The first test for PGA_REFERENCED is an
884 * optimization. The second test is
885 * required because a concurrent pmap
886 * operation could clear the last reference
887 * and set PGA_REFERENCED before the call to
888 * pmap_is_referenced().
890 if ((m->aflags & PGA_REFERENCED) != 0 ||
891 pmap_is_referenced(m) ||
892 (m->aflags & PGA_REFERENCED) != 0)
893 mincoreinfo |= MINCORE_REFERENCED_OTHER;
896 VM_OBJECT_WUNLOCK(object);
899 * subyte may page fault. In case it needs to modify
900 * the map, we release the lock.
902 vm_map_unlock_read(map);
905 * calculate index into user supplied byte vector
907 vecindex = atop(addr - first_addr);
910 * If we have skipped map entries, we need to make sure that
911 * the byte vector is zeroed for those skipped entries.
913 while ((lastvecindex + 1) < vecindex) {
915 error = subyte(vec + lastvecindex, 0);
923 * Pass the page information to the user
925 error = subyte(vec + vecindex, mincoreinfo);
932 * If the map has changed, due to the subyte, the previous
933 * output may be invalid.
935 vm_map_lock_read(map);
936 if (timestamp != map->timestamp)
939 lastvecindex = vecindex;
945 * subyte may page fault. In case it needs to modify
946 * the map, we release the lock.
948 vm_map_unlock_read(map);
951 * Zero the last entries in the byte vector.
953 vecindex = atop(end - first_addr);
954 while ((lastvecindex + 1) < vecindex) {
956 error = subyte(vec + lastvecindex, 0);
964 * If the map has changed, due to the subyte, the previous
965 * output may be invalid.
967 vm_map_lock_read(map);
968 if (timestamp != map->timestamp)
970 vm_map_unlock_read(map);
975 #ifndef _SYS_SYSPROTO_H_
982 sys_mlock(struct thread *td, struct mlock_args *uap)
985 return (kern_mlock(td->td_proc, td->td_ucred,
986 __DECONST(uintptr_t, uap->addr), uap->len));
990 kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len)
992 vm_offset_t addr, end, last, start;
993 vm_size_t npages, size;
998 error = priv_check_cred(cred, PRIV_VM_MLOCK);
1004 start = trunc_page(addr);
1005 end = round_page(last);
1006 if (last < addr || end < addr)
1008 npages = atop(end - start);
1009 if (npages > vm_page_max_user_wired)
1011 map = &proc->p_vmspace->vm_map;
1013 nsize = ptoa(npages + pmap_wired_count(map->pmap));
1014 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) {
1022 error = racct_set(proc, RACCT_MEMLOCK, nsize);
1028 error = vm_map_wire(map, start, end,
1029 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1031 if (racct_enable && error != KERN_SUCCESS) {
1033 racct_set(proc, RACCT_MEMLOCK,
1034 ptoa(pmap_wired_count(map->pmap)));
1038 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1041 #ifndef _SYS_SYSPROTO_H_
1042 struct mlockall_args {
1048 sys_mlockall(struct thread *td, struct mlockall_args *uap)
1053 map = &td->td_proc->p_vmspace->vm_map;
1054 error = priv_check(td, PRIV_VM_MLOCK);
1058 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
1062 * If wiring all pages in the process would cause it to exceed
1063 * a hard resource limit, return ENOMEM.
1065 if (!old_mlock && uap->how & MCL_CURRENT) {
1066 if (map->size > lim_cur(td, RLIMIT_MEMLOCK))
1071 PROC_LOCK(td->td_proc);
1072 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
1073 PROC_UNLOCK(td->td_proc);
1079 if (uap->how & MCL_FUTURE) {
1081 vm_map_modflags(map, MAP_WIREFUTURE, 0);
1086 if (uap->how & MCL_CURRENT) {
1088 * P1003.1-2001 mandates that all currently mapped pages
1089 * will be memory resident and locked (wired) upon return
1090 * from mlockall(). vm_map_wire() will wire pages, by
1091 * calling vm_fault_wire() for each page in the region.
1093 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
1094 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1095 if (error == KERN_SUCCESS)
1097 else if (error == KERN_RESOURCE_SHORTAGE)
1103 if (racct_enable && error != KERN_SUCCESS) {
1104 PROC_LOCK(td->td_proc);
1105 racct_set(td->td_proc, RACCT_MEMLOCK,
1106 ptoa(pmap_wired_count(map->pmap)));
1107 PROC_UNLOCK(td->td_proc);
1114 #ifndef _SYS_SYSPROTO_H_
1115 struct munlockall_args {
1121 sys_munlockall(struct thread *td, struct munlockall_args *uap)
1126 map = &td->td_proc->p_vmspace->vm_map;
1127 error = priv_check(td, PRIV_VM_MUNLOCK);
1131 /* Clear the MAP_WIREFUTURE flag from this vm_map. */
1133 vm_map_modflags(map, 0, MAP_WIREFUTURE);
1136 /* Forcibly unwire all pages. */
1137 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
1138 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1140 if (racct_enable && error == KERN_SUCCESS) {
1141 PROC_LOCK(td->td_proc);
1142 racct_set(td->td_proc, RACCT_MEMLOCK, 0);
1143 PROC_UNLOCK(td->td_proc);
1150 #ifndef _SYS_SYSPROTO_H_
1151 struct munlock_args {
1157 sys_munlock(struct thread *td, struct munlock_args *uap)
1160 return (kern_munlock(td, (uintptr_t)uap->addr, uap->len));
1164 kern_munlock(struct thread *td, uintptr_t addr0, size_t size)
1166 vm_offset_t addr, end, last, start;
1172 error = priv_check(td, PRIV_VM_MUNLOCK);
1177 start = trunc_page(addr);
1178 end = round_page(last);
1179 if (last < addr || end < addr)
1181 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
1182 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1184 if (racct_enable && error == KERN_SUCCESS) {
1185 PROC_LOCK(td->td_proc);
1186 map = &td->td_proc->p_vmspace->vm_map;
1187 racct_set(td->td_proc, RACCT_MEMLOCK,
1188 ptoa(pmap_wired_count(map->pmap)));
1189 PROC_UNLOCK(td->td_proc);
1192 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1198 * Helper function for vm_mmap. Perform sanity check specific for mmap
1199 * operations on vnodes.
1202 vm_mmap_vnode(struct thread *td, vm_size_t objsize,
1203 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1204 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp,
1205 boolean_t *writecounted)
1214 cred = td->td_ucred;
1215 writex = (*maxprotp & VM_PROT_WRITE) != 0 &&
1216 (*flagsp & MAP_SHARED) != 0;
1217 if ((error = vget(vp, LK_SHARED, td)) != 0)
1219 AUDIT_ARG_VNODE1(vp);
1223 if (vp->v_type == VREG) {
1225 * Get the proper underlying object
1231 if (obj->type == OBJT_VNODE && obj->handle != vp) {
1233 vp = (struct vnode *)obj->handle;
1235 * Bypass filesystems obey the mpsafety of the
1236 * underlying fs. Tmpfs never bypasses.
1238 error = vget(vp, LK_SHARED, td);
1243 *writecounted = TRUE;
1244 vnode_pager_update_writecount(obj, 0, objsize);
1250 if ((error = VOP_GETATTR(vp, &va, cred)))
1253 /* This relies on VM_PROT_* matching PROT_*. */
1254 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags);
1258 if ((flags & MAP_SHARED) != 0) {
1259 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
1260 if (prot & VM_PROT_WRITE) {
1264 *maxprotp &= ~VM_PROT_WRITE;
1268 * If it is a regular file without any references
1269 * we do not need to sync it.
1270 * Adjust object size to be the size of actual file.
1272 objsize = round_page(va.va_size);
1273 if (va.va_nlink == 0)
1274 flags |= MAP_NOSYNC;
1275 if (obj->type == OBJT_VNODE) {
1276 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
1283 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP,
1284 ("wrong object type"));
1285 VM_OBJECT_WLOCK(obj);
1286 vm_object_reference_locked(obj);
1287 #if VM_NRESERVLEVEL > 0
1288 vm_object_color(obj, 0);
1290 VM_OBJECT_WUNLOCK(obj);
1295 vfs_mark_atime(vp, cred);
1298 if (error != 0 && *writecounted) {
1299 *writecounted = FALSE;
1300 vnode_pager_update_writecount(obj, objsize, 0);
1309 * Helper function for vm_mmap. Perform sanity check specific for mmap
1310 * operations on cdevs.
1313 vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot,
1314 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw,
1315 vm_ooffset_t *foff, vm_object_t *objp)
1322 if (dsw->d_flags & D_MMAP_ANON) {
1325 *maxprotp = VM_PROT_ALL;
1326 *flagsp |= MAP_ANON;
1330 * cdevs do not provide private mappings of any kind.
1332 if ((*maxprotp & VM_PROT_WRITE) == 0 &&
1333 (prot & VM_PROT_WRITE) != 0)
1335 if (flags & (MAP_PRIVATE|MAP_COPY))
1338 * Force device mappings to be shared.
1340 flags |= MAP_SHARED;
1342 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot);
1347 * First, try d_mmap_single(). If that is not implemented
1348 * (returns ENODEV), fall back to using the device pager.
1349 * Note that d_mmap_single() must return a reference to the
1350 * object (it needs to bump the reference count of the object
1351 * it returns somehow).
1353 * XXX assumes VM_PROT_* == PROT_*
1355 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
1356 if (error != ENODEV)
1358 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
1370 * Internal version of mmap used by exec, sys5 shared memory, and
1371 * various device drivers. Handle is either a vnode pointer, a
1372 * character device, or NULL for MAP_ANON.
1375 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1376 vm_prot_t maxprot, int flags,
1377 objtype_t handle_type, void *handle,
1381 struct thread *td = curthread;
1383 boolean_t writecounted;
1388 size = round_page(size);
1390 writecounted = FALSE;
1393 * Lookup/allocate object.
1395 switch (handle_type) {
1402 dsw = dev_refthread(cdev, &ref);
1405 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev,
1406 dsw, &foff, &object);
1407 dev_relthread(cdev, ref);
1411 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
1412 handle, &foff, &object, &writecounted);
1415 if (handle == NULL) {
1427 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
1428 foff, writecounted, td);
1429 if (error != 0 && object != NULL) {
1431 * If this mapping was accounted for in the vnode's
1432 * writecount, then undo that now.
1435 vnode_pager_release_writecount(object, 0, size);
1436 vm_object_deallocate(object);
1442 * Internal version of mmap that maps a specific VM object into an
1443 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap.
1446 vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1447 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff,
1448 boolean_t writecounted, struct thread *td)
1450 boolean_t curmap, fitit;
1451 vm_offset_t max_addr;
1452 int docow, error, findspace, rv;
1454 curmap = map == &td->td_proc->p_vmspace->vm_map;
1456 RACCT_PROC_LOCK(td->td_proc);
1457 if (map->size + size > lim_cur(td, RLIMIT_VMEM)) {
1458 RACCT_PROC_UNLOCK(td->td_proc);
1461 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
1462 RACCT_PROC_UNLOCK(td->td_proc);
1465 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
1466 if (ptoa(pmap_wired_count(map->pmap)) + size >
1467 lim_cur(td, RLIMIT_MEMLOCK)) {
1468 racct_set_force(td->td_proc, RACCT_VMEM,
1470 RACCT_PROC_UNLOCK(td->td_proc);
1473 error = racct_set(td->td_proc, RACCT_MEMLOCK,
1474 ptoa(pmap_wired_count(map->pmap)) + size);
1476 racct_set_force(td->td_proc, RACCT_VMEM,
1478 RACCT_PROC_UNLOCK(td->td_proc);
1482 RACCT_PROC_UNLOCK(td->td_proc);
1486 * We currently can only deal with page aligned file offsets.
1487 * The mmap() system call already enforces this by subtracting
1488 * the page offset from the file offset, but checking here
1489 * catches errors in device drivers (e.g. d_single_mmap()
1490 * callbacks) and other internal mapping requests (such as in
1493 if (foff & PAGE_MASK)
1496 if ((flags & MAP_FIXED) == 0) {
1498 *addr = round_page(*addr);
1500 if (*addr != trunc_page(*addr))
1505 if (flags & MAP_ANON) {
1506 if (object != NULL || foff != 0)
1509 } else if (flags & MAP_PREFAULT_READ)
1510 docow = MAP_PREFAULT;
1512 docow = MAP_PREFAULT_PARTIAL;
1514 if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
1515 docow |= MAP_COPY_ON_WRITE;
1516 if (flags & MAP_NOSYNC)
1517 docow |= MAP_DISABLE_SYNCER;
1518 if (flags & MAP_NOCORE)
1519 docow |= MAP_DISABLE_COREDUMP;
1520 /* Shared memory is also shared with children. */
1521 if (flags & MAP_SHARED)
1522 docow |= MAP_INHERIT_SHARE;
1524 docow |= MAP_VN_WRITECOUNT;
1525 if (flags & MAP_STACK) {
1528 docow |= MAP_STACK_GROWS_DOWN;
1530 if ((flags & MAP_EXCL) != 0)
1531 docow |= MAP_CHECK_EXCL;
1532 if ((flags & MAP_GUARD) != 0)
1533 docow |= MAP_CREATE_GUARD;
1536 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
1537 findspace = VMFS_SUPER_SPACE;
1538 else if ((flags & MAP_ALIGNMENT_MASK) != 0)
1539 findspace = VMFS_ALIGNED_SPACE(flags >>
1540 MAP_ALIGNMENT_SHIFT);
1542 findspace = VMFS_OPTIMAL_SPACE;
1545 if ((flags & MAP_32BIT) != 0)
1546 max_addr = MAP_32BIT_MAX_ADDR;
1549 rv = vm_map_find_min(map, object, foff, addr, size,
1550 round_page((vm_offset_t)td->td_proc->p_vmspace->
1551 vm_daddr + lim_max(td, RLIMIT_DATA)), max_addr,
1552 findspace, prot, maxprot, docow);
1554 rv = vm_map_find(map, object, foff, addr, size,
1555 max_addr, findspace, prot, maxprot, docow);
1558 rv = vm_map_fixed(map, object, foff, *addr, size,
1559 prot, maxprot, docow);
1562 if (rv == KERN_SUCCESS) {
1564 * If the process has requested that all future mappings
1565 * be wired, then heed this.
1567 if ((map->flags & MAP_WIREFUTURE) != 0) {
1569 if ((map->flags & MAP_WIREFUTURE) != 0)
1570 (void)vm_map_wire_locked(map, *addr,
1571 *addr + size, VM_MAP_WIRE_USER |
1572 ((flags & MAP_STACK) ? VM_MAP_WIRE_HOLESOK :
1573 VM_MAP_WIRE_NOHOLES));
1577 return (vm_mmap_to_errno(rv));
1581 * Translate a Mach VM return code to zero on success or the appropriate errno
1585 vm_mmap_to_errno(int rv)
1591 case KERN_INVALID_ADDRESS:
1594 case KERN_PROTECTION_FAILURE: