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>
78 #include <security/audit/audit.h>
79 #include <security/mac/mac_framework.h>
82 #include <vm/vm_param.h>
84 #include <vm/vm_map.h>
85 #include <vm/vm_object.h>
86 #include <vm/vm_page.h>
87 #include <vm/vm_pager.h>
88 #include <vm/vm_pageout.h>
89 #include <vm/vm_extern.h>
90 #include <vm/vm_page.h>
91 #include <vm/vnode_pager.h>
94 #include <sys/pmckern.h>
98 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0,
99 "Do not apply RLIMIT_MEMLOCK on mlockall");
102 #define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
105 #ifndef _SYS_SYSPROTO_H_
112 sys_sbrk(struct thread *td, struct sbrk_args *uap)
114 /* Not yet implemented */
118 #ifndef _SYS_SYSPROTO_H_
125 sys_sstk(struct thread *td, struct sstk_args *uap)
127 /* Not yet implemented */
131 #if defined(COMPAT_43)
132 #ifndef _SYS_SYSPROTO_H_
133 struct getpagesize_args {
139 ogetpagesize(struct thread *td, struct getpagesize_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 size, int prot, int flags,
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 ((size == 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 /* Adjust size for rounding (on both ends). */
259 size += pageoff; /* low end... */
260 size = (vm_size_t) round_page(size); /* hi end */
262 /* Ensure alignment is at least a page and fits in a pointer. */
263 align = flags & MAP_ALIGNMENT_MASK;
264 if (align != 0 && align != MAP_ALIGNED_SUPER &&
265 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
266 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
270 * Check for illegal addresses. Watch out for address wrap... Note
271 * that VM_*_ADDRESS are not constants due to casts (argh).
273 if (flags & MAP_FIXED) {
275 * The specified address must have the same remainder
276 * as the file offset taken modulo PAGE_SIZE, so it
277 * should be aligned after adjustment by pageoff.
280 if (addr & PAGE_MASK)
283 /* Address range must be all in user VM space. */
284 if (addr < vm_map_min(&vms->vm_map) ||
285 addr + size > vm_map_max(&vms->vm_map))
287 if (addr + size < addr)
290 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
292 } else if (flags & MAP_32BIT) {
294 * For MAP_32BIT, override the hint if it is too high and
295 * do not bother moving the mapping past the heap (since
296 * the heap is usually above 2GB).
298 if (addr + size > MAP_32BIT_MAX_ADDR)
303 * XXX for non-fixed mappings where no hint is provided or
304 * the hint would fall in the potential heap space,
305 * place it after the end of the largest possible heap.
307 * There should really be a pmap call to determine a reasonable
311 (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
312 addr < round_page((vm_offset_t)vms->vm_daddr +
313 lim_max(td, RLIMIT_DATA))))
314 addr = round_page((vm_offset_t)vms->vm_daddr +
315 lim_max(td, RLIMIT_DATA));
319 * Return success without mapping anything for old
320 * binaries that request a page-aligned mapping of
321 * length 0. For modern binaries, this function
322 * returns an error earlier.
325 } else if ((flags & MAP_GUARD) != 0) {
326 error = vm_mmap_object(&vms->vm_map, &addr, size, VM_PROT_NONE,
327 VM_PROT_NONE, flags, NULL, pos, FALSE, td);
328 } else if ((flags & MAP_ANON) != 0) {
330 * Mapping blank space is trivial.
332 * This relies on VM_PROT_* matching PROT_*.
334 error = vm_mmap_object(&vms->vm_map, &addr, size, prot,
335 VM_PROT_ALL, flags, NULL, pos, FALSE, td);
338 * Mapping file, get fp for validation and don't let the
339 * descriptor disappear on us if we block. Check capability
340 * rights, but also return the maximum rights to be combined
341 * with maxprot later.
343 cap_rights_init(&rights, CAP_MMAP);
344 if (prot & PROT_READ)
345 cap_rights_set(&rights, CAP_MMAP_R);
346 if ((flags & MAP_SHARED) != 0) {
347 if (prot & PROT_WRITE)
348 cap_rights_set(&rights, CAP_MMAP_W);
350 if (prot & PROT_EXEC)
351 cap_rights_set(&rights, CAP_MMAP_X);
352 error = fget_mmap(td, fd, &rights, &cap_maxprot, &fp);
355 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 &&
356 td->td_proc->p_osrel >= P_OSREL_MAP_FSTRICT) {
361 /* This relies on VM_PROT_* matching PROT_*. */
362 error = fo_mmap(fp, &vms->vm_map, &addr, size, prot,
363 cap_maxprot, flags, pos, td);
367 td->td_retval[0] = (register_t) (addr + pageoff);
375 #if defined(COMPAT_FREEBSD6)
377 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
380 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, uap->prot,
381 uap->flags, uap->fd, uap->pos));
386 #ifndef _SYS_SYSPROTO_H_
397 ommap(struct thread *td, struct ommap_args *uap)
399 static const char cvtbsdprot[8] = {
403 PROT_EXEC | PROT_WRITE,
405 PROT_EXEC | PROT_READ,
406 PROT_WRITE | PROT_READ,
407 PROT_EXEC | PROT_WRITE | PROT_READ,
411 #define OMAP_ANON 0x0002
412 #define OMAP_COPY 0x0020
413 #define OMAP_SHARED 0x0010
414 #define OMAP_FIXED 0x0100
416 prot = cvtbsdprot[uap->prot & 0x7];
417 #ifdef COMPAT_FREEBSD32
418 #if defined(__amd64__)
419 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
425 if (uap->flags & OMAP_ANON)
427 if (uap->flags & OMAP_COPY)
429 if (uap->flags & OMAP_SHARED)
432 flags |= MAP_PRIVATE;
433 if (uap->flags & OMAP_FIXED)
435 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, prot, flags,
438 #endif /* COMPAT_43 */
441 #ifndef _SYS_SYSPROTO_H_
449 sys_msync(struct thread *td, struct msync_args *uap)
452 return (kern_msync(td, (uintptr_t)uap->addr, uap->len, uap->flags));
456 kern_msync(struct thread *td, uintptr_t addr0, size_t size, int flags)
464 pageoff = (addr & PAGE_MASK);
467 size = (vm_size_t) round_page(size);
468 if (addr + size < addr)
471 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
474 map = &td->td_proc->p_vmspace->vm_map;
477 * Clean the pages and interpret the return value.
479 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
480 (flags & MS_INVALIDATE) != 0);
484 case KERN_INVALID_ADDRESS:
486 case KERN_INVALID_ARGUMENT:
495 #ifndef _SYS_SYSPROTO_H_
502 sys_munmap(struct thread *td, struct munmap_args *uap)
505 return (kern_munmap(td, (uintptr_t)uap->addr, uap->len));
509 kern_munmap(struct thread *td, uintptr_t addr0, size_t size)
512 struct pmckern_map_out pkm;
513 vm_map_entry_t entry;
524 pageoff = (addr & PAGE_MASK);
527 size = (vm_size_t) round_page(size);
528 if (addr + size < addr)
532 * Check for illegal addresses. Watch out for address wrap...
534 map = &td->td_proc->p_vmspace->vm_map;
535 if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
540 if (PMC_HOOK_INSTALLED(PMC_FN_MUNMAP)) {
543 * Inform hwpmc if the address range being unmapped contains
544 * an executable region.
546 pkm.pm_address = (uintptr_t) NULL;
547 if (vm_map_lookup_entry(map, addr, &entry)) {
548 for (; entry->start < addr + size;
549 entry = entry->next) {
550 if (vm_map_check_protection(map, entry->start,
551 entry->end, VM_PROT_EXECUTE) == TRUE) {
552 pkm.pm_address = (uintptr_t) addr;
553 pkm.pm_size = (size_t) size;
560 vm_map_delete(map, addr, addr + size);
563 if (__predict_false(pmc_handled)) {
564 /* downgrade the lock to prevent a LOR with the pmc-sx lock */
565 vm_map_lock_downgrade(map);
566 if (pkm.pm_address != (uintptr_t) NULL)
567 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
568 vm_map_unlock_read(map);
573 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */
577 #ifndef _SYS_SYSPROTO_H_
578 struct mprotect_args {
585 sys_mprotect(struct thread *td, struct mprotect_args *uap)
588 return (kern_mprotect(td, (uintptr_t)uap->addr, uap->len, uap->prot));
592 kern_mprotect(struct thread *td, uintptr_t addr0, size_t size, int prot)
598 prot = (prot & VM_PROT_ALL);
599 pageoff = (addr & PAGE_MASK);
602 size = (vm_size_t) round_page(size);
603 if (addr + size < addr)
606 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr,
607 addr + size, prot, FALSE)) {
610 case KERN_PROTECTION_FAILURE:
612 case KERN_RESOURCE_SHORTAGE:
618 #ifndef _SYS_SYSPROTO_H_
619 struct minherit_args {
626 sys_minherit(struct thread *td, struct minherit_args *uap)
629 vm_size_t size, pageoff;
630 vm_inherit_t inherit;
632 addr = (vm_offset_t)uap->addr;
634 inherit = uap->inherit;
636 pageoff = (addr & PAGE_MASK);
639 size = (vm_size_t) round_page(size);
640 if (addr + size < addr)
643 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr,
644 addr + size, inherit)) {
647 case KERN_PROTECTION_FAILURE:
653 #ifndef _SYS_SYSPROTO_H_
654 struct madvise_args {
662 sys_madvise(struct thread *td, struct madvise_args *uap)
665 return (kern_madvise(td, (uintptr_t)uap->addr, uap->len, uap->behav));
669 kern_madvise(struct thread *td, uintptr_t addr0, size_t len, int behav)
672 vm_offset_t addr, end, start;
676 * Check for our special case, advising the swap pager we are
679 if (behav == MADV_PROTECT) {
681 return (kern_procctl(td, P_PID, td->td_proc->p_pid,
682 PROC_SPROTECT, &flags));
686 * Check for illegal behavior
688 if (behav < 0 || behav > MADV_CORE)
691 * Check for illegal addresses. Watch out for address wrap... Note
692 * that VM_*_ADDRESS are not constants due to casts (argh).
694 map = &td->td_proc->p_vmspace->vm_map;
696 if (addr < vm_map_min(map) || addr + len > vm_map_max(map))
698 if ((addr + len) < addr)
702 * Since this routine is only advisory, we default to conservative
705 start = trunc_page(addr);
706 end = round_page(addr + len);
708 if (vm_map_madvise(map, start, end, behav))
713 #ifndef _SYS_SYSPROTO_H_
714 struct mincore_args {
722 sys_mincore(struct thread *td, struct mincore_args *uap)
725 return (kern_mincore(td, (uintptr_t)uap->addr, uap->len, uap->vec));
729 kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec)
731 vm_offset_t addr, first_addr;
732 vm_offset_t end, cend;
736 int vecindex, lastvecindex;
737 vm_map_entry_t current;
738 vm_map_entry_t entry;
740 vm_paddr_t locked_pa;
744 unsigned int timestamp;
748 * Make sure that the addresses presented are valid for user
751 first_addr = addr = trunc_page(addr0);
752 end = addr + (vm_size_t)round_page(len);
753 map = &td->td_proc->p_vmspace->vm_map;
754 if (end > vm_map_max(map) || end < addr)
757 pmap = vmspace_pmap(td->td_proc->p_vmspace);
759 vm_map_lock_read(map);
761 timestamp = map->timestamp;
763 if (!vm_map_lookup_entry(map, addr, &entry)) {
764 vm_map_unlock_read(map);
769 * Do this on a map entry basis so that if the pages are not
770 * in the current processes address space, we can easily look
771 * up the pages elsewhere.
774 for (current = entry; current->start < end; current = current->next) {
777 * check for contiguity
779 if (current->end < end && current->next->start > current->end) {
780 vm_map_unlock_read(map);
785 * ignore submaps (for now) or null objects
787 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
788 current->object.vm_object == NULL)
792 * limit this scan to the current map entry and the
793 * limits for the mincore call
795 if (addr < current->start)
796 addr = current->start;
802 * scan this entry one page at a time
804 while (addr < cend) {
806 * Check pmap first, it is likely faster, also
807 * it can provide info as to whether we are the
808 * one referencing or modifying the page.
814 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa);
815 if (locked_pa != 0) {
817 * The page is mapped by this process but not
818 * both accessed and modified. It is also
819 * managed. Acquire the object lock so that
820 * other mappings might be examined.
822 m = PHYS_TO_VM_PAGE(locked_pa);
823 if (m->object != object) {
825 VM_OBJECT_WUNLOCK(object);
827 locked = VM_OBJECT_TRYWLOCK(object);
830 VM_OBJECT_WLOCK(object);
836 KASSERT(m->valid == VM_PAGE_BITS_ALL,
837 ("mincore: page %p is mapped but invalid",
839 } else if (mincoreinfo == 0) {
841 * The page is not mapped by this process. If
842 * the object implements managed pages, then
843 * determine if the page is resident so that
844 * the mappings might be examined.
846 if (current->object.vm_object != object) {
848 VM_OBJECT_WUNLOCK(object);
849 object = current->object.vm_object;
850 VM_OBJECT_WLOCK(object);
852 if (object->type == OBJT_DEFAULT ||
853 object->type == OBJT_SWAP ||
854 object->type == OBJT_VNODE) {
855 pindex = OFF_TO_IDX(current->offset +
856 (addr - current->start));
857 m = vm_page_lookup(object, pindex);
858 if (m != NULL && m->valid == 0)
861 mincoreinfo = MINCORE_INCORE;
865 /* Examine other mappings to the page. */
866 if (m->dirty == 0 && pmap_is_modified(m))
869 mincoreinfo |= MINCORE_MODIFIED_OTHER;
871 * The first test for PGA_REFERENCED is an
872 * optimization. The second test is
873 * required because a concurrent pmap
874 * operation could clear the last reference
875 * and set PGA_REFERENCED before the call to
876 * pmap_is_referenced().
878 if ((m->aflags & PGA_REFERENCED) != 0 ||
879 pmap_is_referenced(m) ||
880 (m->aflags & PGA_REFERENCED) != 0)
881 mincoreinfo |= MINCORE_REFERENCED_OTHER;
884 VM_OBJECT_WUNLOCK(object);
887 * subyte may page fault. In case it needs to modify
888 * the map, we release the lock.
890 vm_map_unlock_read(map);
893 * calculate index into user supplied byte vector
895 vecindex = atop(addr - first_addr);
898 * If we have skipped map entries, we need to make sure that
899 * the byte vector is zeroed for those skipped entries.
901 while ((lastvecindex + 1) < vecindex) {
903 error = subyte(vec + lastvecindex, 0);
911 * Pass the page information to the user
913 error = subyte(vec + vecindex, mincoreinfo);
920 * If the map has changed, due to the subyte, the previous
921 * output may be invalid.
923 vm_map_lock_read(map);
924 if (timestamp != map->timestamp)
927 lastvecindex = vecindex;
933 * subyte may page fault. In case it needs to modify
934 * the map, we release the lock.
936 vm_map_unlock_read(map);
939 * Zero the last entries in the byte vector.
941 vecindex = atop(end - first_addr);
942 while ((lastvecindex + 1) < vecindex) {
944 error = subyte(vec + lastvecindex, 0);
952 * If the map has changed, due to the subyte, the previous
953 * output may be invalid.
955 vm_map_lock_read(map);
956 if (timestamp != map->timestamp)
958 vm_map_unlock_read(map);
963 #ifndef _SYS_SYSPROTO_H_
970 sys_mlock(struct thread *td, struct mlock_args *uap)
973 return (kern_mlock(td->td_proc, td->td_ucred,
974 __DECONST(uintptr_t, uap->addr), uap->len));
978 kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len)
980 vm_offset_t addr, end, last, start;
981 vm_size_t npages, size;
986 error = priv_check_cred(cred, PRIV_VM_MLOCK, 0);
992 start = trunc_page(addr);
993 end = round_page(last);
994 if (last < addr || end < addr)
996 npages = atop(end - start);
997 if (npages > vm_page_max_wired)
999 map = &proc->p_vmspace->vm_map;
1001 nsize = ptoa(npages + pmap_wired_count(map->pmap));
1002 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) {
1007 if (npages + vm_wire_count() > vm_page_max_wired)
1012 error = racct_set(proc, RACCT_MEMLOCK, nsize);
1018 error = vm_map_wire(map, start, end,
1019 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1021 if (racct_enable && error != KERN_SUCCESS) {
1023 racct_set(proc, RACCT_MEMLOCK,
1024 ptoa(pmap_wired_count(map->pmap)));
1028 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1031 #ifndef _SYS_SYSPROTO_H_
1032 struct mlockall_args {
1038 sys_mlockall(struct thread *td, struct mlockall_args *uap)
1043 map = &td->td_proc->p_vmspace->vm_map;
1044 error = priv_check(td, PRIV_VM_MLOCK);
1048 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
1052 * If wiring all pages in the process would cause it to exceed
1053 * a hard resource limit, return ENOMEM.
1055 if (!old_mlock && uap->how & MCL_CURRENT) {
1056 PROC_LOCK(td->td_proc);
1057 if (map->size > lim_cur(td, RLIMIT_MEMLOCK)) {
1058 PROC_UNLOCK(td->td_proc);
1061 PROC_UNLOCK(td->td_proc);
1065 PROC_LOCK(td->td_proc);
1066 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
1067 PROC_UNLOCK(td->td_proc);
1073 if (uap->how & MCL_FUTURE) {
1075 vm_map_modflags(map, MAP_WIREFUTURE, 0);
1080 if (uap->how & MCL_CURRENT) {
1082 * P1003.1-2001 mandates that all currently mapped pages
1083 * will be memory resident and locked (wired) upon return
1084 * from mlockall(). vm_map_wire() will wire pages, by
1085 * calling vm_fault_wire() for each page in the region.
1087 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
1088 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1089 error = (error == KERN_SUCCESS ? 0 : EAGAIN);
1092 if (racct_enable && error != KERN_SUCCESS) {
1093 PROC_LOCK(td->td_proc);
1094 racct_set(td->td_proc, RACCT_MEMLOCK,
1095 ptoa(pmap_wired_count(map->pmap)));
1096 PROC_UNLOCK(td->td_proc);
1103 #ifndef _SYS_SYSPROTO_H_
1104 struct munlockall_args {
1110 sys_munlockall(struct thread *td, struct munlockall_args *uap)
1115 map = &td->td_proc->p_vmspace->vm_map;
1116 error = priv_check(td, PRIV_VM_MUNLOCK);
1120 /* Clear the MAP_WIREFUTURE flag from this vm_map. */
1122 vm_map_modflags(map, 0, MAP_WIREFUTURE);
1125 /* Forcibly unwire all pages. */
1126 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
1127 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1129 if (racct_enable && error == KERN_SUCCESS) {
1130 PROC_LOCK(td->td_proc);
1131 racct_set(td->td_proc, RACCT_MEMLOCK, 0);
1132 PROC_UNLOCK(td->td_proc);
1139 #ifndef _SYS_SYSPROTO_H_
1140 struct munlock_args {
1146 sys_munlock(struct thread *td, struct munlock_args *uap)
1149 return (kern_munlock(td, (uintptr_t)uap->addr, uap->len));
1153 kern_munlock(struct thread *td, uintptr_t addr0, size_t size)
1155 vm_offset_t addr, end, last, start;
1161 error = priv_check(td, PRIV_VM_MUNLOCK);
1166 start = trunc_page(addr);
1167 end = round_page(last);
1168 if (last < addr || end < addr)
1170 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
1171 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1173 if (racct_enable && error == KERN_SUCCESS) {
1174 PROC_LOCK(td->td_proc);
1175 map = &td->td_proc->p_vmspace->vm_map;
1176 racct_set(td->td_proc, RACCT_MEMLOCK,
1177 ptoa(pmap_wired_count(map->pmap)));
1178 PROC_UNLOCK(td->td_proc);
1181 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1187 * Helper function for vm_mmap. Perform sanity check specific for mmap
1188 * operations on vnodes.
1191 vm_mmap_vnode(struct thread *td, vm_size_t objsize,
1192 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1193 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp,
1194 boolean_t *writecounted)
1200 int error, flags, locktype;
1202 cred = td->td_ucred;
1203 if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED))
1204 locktype = LK_EXCLUSIVE;
1206 locktype = LK_SHARED;
1207 if ((error = vget(vp, locktype, td)) != 0)
1209 AUDIT_ARG_VNODE1(vp);
1213 if (vp->v_type == VREG) {
1215 * Get the proper underlying object
1221 if (obj->type == OBJT_VNODE && obj->handle != vp) {
1223 vp = (struct vnode *)obj->handle;
1225 * Bypass filesystems obey the mpsafety of the
1226 * underlying fs. Tmpfs never bypasses.
1228 error = vget(vp, locktype, td);
1232 if (locktype == LK_EXCLUSIVE) {
1233 *writecounted = TRUE;
1234 vnode_pager_update_writecount(obj, 0, objsize);
1240 if ((error = VOP_GETATTR(vp, &va, cred)))
1243 /* This relies on VM_PROT_* matching PROT_*. */
1244 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags);
1248 if ((flags & MAP_SHARED) != 0) {
1249 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
1250 if (prot & VM_PROT_WRITE) {
1254 *maxprotp &= ~VM_PROT_WRITE;
1258 * If it is a regular file without any references
1259 * we do not need to sync it.
1260 * Adjust object size to be the size of actual file.
1262 objsize = round_page(va.va_size);
1263 if (va.va_nlink == 0)
1264 flags |= MAP_NOSYNC;
1265 if (obj->type == OBJT_VNODE) {
1266 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
1273 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP,
1274 ("wrong object type"));
1275 VM_OBJECT_WLOCK(obj);
1276 vm_object_reference_locked(obj);
1277 #if VM_NRESERVLEVEL > 0
1278 vm_object_color(obj, 0);
1280 VM_OBJECT_WUNLOCK(obj);
1285 vfs_mark_atime(vp, cred);
1288 if (error != 0 && *writecounted) {
1289 *writecounted = FALSE;
1290 vnode_pager_update_writecount(obj, objsize, 0);
1299 * Helper function for vm_mmap. Perform sanity check specific for mmap
1300 * operations on cdevs.
1303 vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot,
1304 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw,
1305 vm_ooffset_t *foff, vm_object_t *objp)
1312 if (dsw->d_flags & D_MMAP_ANON) {
1315 *maxprotp = VM_PROT_ALL;
1316 *flagsp |= MAP_ANON;
1320 * cdevs do not provide private mappings of any kind.
1322 if ((*maxprotp & VM_PROT_WRITE) == 0 &&
1323 (prot & VM_PROT_WRITE) != 0)
1325 if (flags & (MAP_PRIVATE|MAP_COPY))
1328 * Force device mappings to be shared.
1330 flags |= MAP_SHARED;
1332 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot);
1337 * First, try d_mmap_single(). If that is not implemented
1338 * (returns ENODEV), fall back to using the device pager.
1339 * Note that d_mmap_single() must return a reference to the
1340 * object (it needs to bump the reference count of the object
1341 * it returns somehow).
1343 * XXX assumes VM_PROT_* == PROT_*
1345 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
1346 if (error != ENODEV)
1348 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
1360 * Internal version of mmap used by exec, sys5 shared memory, and
1361 * various device drivers. Handle is either a vnode pointer, a
1362 * character device, or NULL for MAP_ANON.
1365 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1366 vm_prot_t maxprot, int flags,
1367 objtype_t handle_type, void *handle,
1371 struct thread *td = curthread;
1373 boolean_t writecounted;
1378 size = round_page(size);
1380 writecounted = FALSE;
1383 * Lookup/allocate object.
1385 switch (handle_type) {
1392 dsw = dev_refthread(cdev, &ref);
1395 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev,
1396 dsw, &foff, &object);
1397 dev_relthread(cdev, ref);
1401 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
1402 handle, &foff, &object, &writecounted);
1405 if (handle == NULL) {
1417 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
1418 foff, writecounted, td);
1419 if (error != 0 && object != NULL) {
1421 * If this mapping was accounted for in the vnode's
1422 * writecount, then undo that now.
1425 vnode_pager_release_writecount(object, 0, size);
1426 vm_object_deallocate(object);
1432 * Internal version of mmap that maps a specific VM object into an
1433 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap.
1436 vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1437 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff,
1438 boolean_t writecounted, struct thread *td)
1440 boolean_t curmap, fitit;
1441 vm_offset_t max_addr;
1442 int docow, error, findspace, rv;
1444 curmap = map == &td->td_proc->p_vmspace->vm_map;
1446 PROC_LOCK(td->td_proc);
1447 if (map->size + size > lim_cur_proc(td->td_proc, RLIMIT_VMEM)) {
1448 PROC_UNLOCK(td->td_proc);
1451 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
1452 PROC_UNLOCK(td->td_proc);
1455 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
1456 if (ptoa(pmap_wired_count(map->pmap)) + size >
1457 lim_cur_proc(td->td_proc, RLIMIT_MEMLOCK)) {
1458 racct_set_force(td->td_proc, RACCT_VMEM,
1460 PROC_UNLOCK(td->td_proc);
1463 error = racct_set(td->td_proc, RACCT_MEMLOCK,
1464 ptoa(pmap_wired_count(map->pmap)) + size);
1466 racct_set_force(td->td_proc, RACCT_VMEM,
1468 PROC_UNLOCK(td->td_proc);
1472 PROC_UNLOCK(td->td_proc);
1476 * We currently can only deal with page aligned file offsets.
1477 * The mmap() system call already enforces this by subtracting
1478 * the page offset from the file offset, but checking here
1479 * catches errors in device drivers (e.g. d_single_mmap()
1480 * callbacks) and other internal mapping requests (such as in
1483 if (foff & PAGE_MASK)
1486 if ((flags & MAP_FIXED) == 0) {
1488 *addr = round_page(*addr);
1490 if (*addr != trunc_page(*addr))
1495 if (flags & MAP_ANON) {
1496 if (object != NULL || foff != 0)
1499 } else if (flags & MAP_PREFAULT_READ)
1500 docow = MAP_PREFAULT;
1502 docow = MAP_PREFAULT_PARTIAL;
1504 if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
1505 docow |= MAP_COPY_ON_WRITE;
1506 if (flags & MAP_NOSYNC)
1507 docow |= MAP_DISABLE_SYNCER;
1508 if (flags & MAP_NOCORE)
1509 docow |= MAP_DISABLE_COREDUMP;
1510 /* Shared memory is also shared with children. */
1511 if (flags & MAP_SHARED)
1512 docow |= MAP_INHERIT_SHARE;
1514 docow |= MAP_VN_WRITECOUNT;
1515 if (flags & MAP_STACK) {
1518 docow |= MAP_STACK_GROWS_DOWN;
1520 if ((flags & MAP_EXCL) != 0)
1521 docow |= MAP_CHECK_EXCL;
1522 if ((flags & MAP_GUARD) != 0)
1523 docow |= MAP_CREATE_GUARD;
1526 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
1527 findspace = VMFS_SUPER_SPACE;
1528 else if ((flags & MAP_ALIGNMENT_MASK) != 0)
1529 findspace = VMFS_ALIGNED_SPACE(flags >>
1530 MAP_ALIGNMENT_SHIFT);
1532 findspace = VMFS_OPTIMAL_SPACE;
1535 if ((flags & MAP_32BIT) != 0)
1536 max_addr = MAP_32BIT_MAX_ADDR;
1539 rv = vm_map_find_min(map, object, foff, addr, size,
1540 round_page((vm_offset_t)td->td_proc->p_vmspace->
1541 vm_daddr + lim_max(td, RLIMIT_DATA)), max_addr,
1542 findspace, prot, maxprot, docow);
1544 rv = vm_map_find(map, object, foff, addr, size,
1545 max_addr, findspace, prot, maxprot, docow);
1548 rv = vm_map_fixed(map, object, foff, *addr, size,
1549 prot, maxprot, docow);
1552 if (rv == KERN_SUCCESS) {
1554 * If the process has requested that all future mappings
1555 * be wired, then heed this.
1557 if (map->flags & MAP_WIREFUTURE) {
1558 vm_map_wire(map, *addr, *addr + size,
1559 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ?
1560 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES));
1563 return (vm_mmap_to_errno(rv));
1567 * Translate a Mach VM return code to zero on success or the appropriate errno
1571 vm_mmap_to_errno(int rv)
1577 case KERN_INVALID_ADDRESS:
1580 case KERN_PROTECTION_FAILURE: