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"
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/capsicum.h>
53 #include <sys/kernel.h>
55 #include <sys/mutex.h>
56 #include <sys/sysproto.h>
57 #include <sys/filedesc.h>
60 #include <sys/procctl.h>
61 #include <sys/racct.h>
62 #include <sys/resource.h>
63 #include <sys/resourcevar.h>
64 #include <sys/rwlock.h>
65 #include <sys/sysctl.h>
66 #include <sys/vnode.h>
67 #include <sys/fcntl.h>
70 #include <sys/mount.h>
73 #include <sys/syscallsubr.h>
74 #include <sys/sysent.h>
75 #include <sys/vmmeter.h>
77 #include <security/audit/audit.h>
78 #include <security/mac/mac_framework.h>
81 #include <vm/vm_param.h>
83 #include <vm/vm_map.h>
84 #include <vm/vm_object.h>
85 #include <vm/vm_page.h>
86 #include <vm/vm_pager.h>
87 #include <vm/vm_pageout.h>
88 #include <vm/vm_extern.h>
89 #include <vm/vm_page.h>
90 #include <vm/vnode_pager.h>
93 #include <sys/pmckern.h>
97 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0,
98 "Do not apply RLIMIT_MEMLOCK on mlockall");
101 #define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
104 #ifndef _SYS_SYSPROTO_H_
117 struct sbrk_args *uap;
119 /* Not yet implemented */
123 #ifndef _SYS_SYSPROTO_H_
136 struct sstk_args *uap;
138 /* Not yet implemented */
142 #if defined(COMPAT_43)
143 #ifndef _SYS_SYSPROTO_H_
144 struct getpagesize_args {
150 ogetpagesize(td, uap)
152 struct getpagesize_args *uap;
155 td->td_retval[0] = PAGE_SIZE;
158 #endif /* COMPAT_43 */
162 * Memory Map (mmap) system call. Note that the file offset
163 * and address are allowed to be NOT page aligned, though if
164 * the MAP_FIXED flag it set, both must have the same remainder
165 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
166 * page-aligned, the actual mapping starts at trunc_page(addr)
167 * and the return value is adjusted up by the page offset.
169 * Generally speaking, only character devices which are themselves
170 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise
171 * there would be no cache coherency between a descriptor and a VM mapping
172 * both to the same character device.
174 #ifndef _SYS_SYSPROTO_H_
192 struct mmap_args *uap;
196 vm_size_t size, pageoff;
197 vm_prot_t cap_maxprot;
198 int align, error, flags, prot;
200 struct vmspace *vms = td->td_proc->p_vmspace;
203 addr = (vm_offset_t) uap->addr;
210 AUDIT_ARG_FD(uap->fd);
213 * Ignore old flags that used to be defined but did not do anything.
215 flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040);
218 * Enforce the constraints.
219 * Mapping of length 0 is only allowed for old binaries.
220 * Anonymous mapping shall specify -1 as filedescriptor and
221 * zero position for new code. Be nice to ancient a.out
222 * binaries and correct pos for anonymous mapping, since old
223 * ld.so sometimes issues anonymous map requests with non-zero
226 if (!SV_CURPROC_FLAG(SV_AOUT)) {
227 if ((uap->len == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) ||
228 ((flags & MAP_ANON) != 0 && (uap->fd != -1 || pos != 0)))
231 if ((flags & MAP_ANON) != 0)
235 if (flags & MAP_STACK) {
236 if ((uap->fd != -1) ||
237 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
242 if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE |
243 MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE |
248 MAP_ALIGNMENT_MASK)) != 0)
250 if ((flags & (MAP_EXCL | MAP_FIXED)) == MAP_EXCL)
252 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == (MAP_SHARED | MAP_PRIVATE))
254 if (prot != PROT_NONE &&
255 (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0)
259 * Align the file position to a page boundary,
260 * and save its page offset component.
262 pageoff = (pos & PAGE_MASK);
265 /* Adjust size for rounding (on both ends). */
266 size += pageoff; /* low end... */
267 size = (vm_size_t) round_page(size); /* hi end */
269 /* Ensure alignment is at least a page and fits in a pointer. */
270 align = flags & MAP_ALIGNMENT_MASK;
271 if (align != 0 && align != MAP_ALIGNED_SUPER &&
272 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
273 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
277 * Check for illegal addresses. Watch out for address wrap... Note
278 * that VM_*_ADDRESS are not constants due to casts (argh).
280 if (flags & MAP_FIXED) {
282 * The specified address must have the same remainder
283 * as the file offset taken modulo PAGE_SIZE, so it
284 * should be aligned after adjustment by pageoff.
287 if (addr & PAGE_MASK)
290 /* Address range must be all in user VM space. */
291 if (addr < vm_map_min(&vms->vm_map) ||
292 addr + size > vm_map_max(&vms->vm_map))
294 if (addr + size < addr)
297 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
299 } else if (flags & MAP_32BIT) {
301 * For MAP_32BIT, override the hint if it is too high and
302 * do not bother moving the mapping past the heap (since
303 * the heap is usually above 2GB).
305 if (addr + size > MAP_32BIT_MAX_ADDR)
310 * XXX for non-fixed mappings where no hint is provided or
311 * the hint would fall in the potential heap space,
312 * place it after the end of the largest possible heap.
314 * There should really be a pmap call to determine a reasonable
318 (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
319 addr < round_page((vm_offset_t)vms->vm_daddr +
320 lim_max(td, RLIMIT_DATA))))
321 addr = round_page((vm_offset_t)vms->vm_daddr +
322 lim_max(td, RLIMIT_DATA));
326 * Return success without mapping anything for old
327 * binaries that request a page-aligned mapping of
328 * length 0. For modern binaries, this function
329 * returns an error earlier.
332 } else if (flags & MAP_ANON) {
334 * Mapping blank space is trivial.
336 * This relies on VM_PROT_* matching PROT_*.
338 error = vm_mmap_object(&vms->vm_map, &addr, size, prot,
339 VM_PROT_ALL, flags, NULL, pos, FALSE, td);
342 * Mapping file, get fp for validation and don't let the
343 * descriptor disappear on us if we block. Check capability
344 * rights, but also return the maximum rights to be combined
345 * with maxprot later.
347 cap_rights_init(&rights, CAP_MMAP);
348 if (prot & PROT_READ)
349 cap_rights_set(&rights, CAP_MMAP_R);
350 if ((flags & MAP_SHARED) != 0) {
351 if (prot & PROT_WRITE)
352 cap_rights_set(&rights, CAP_MMAP_W);
354 if (prot & PROT_EXEC)
355 cap_rights_set(&rights, CAP_MMAP_X);
356 error = fget_mmap(td, uap->fd, &rights, &cap_maxprot, &fp);
359 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 &&
360 td->td_proc->p_osrel >= P_OSREL_MAP_FSTRICT) {
365 /* This relies on VM_PROT_* matching PROT_*. */
366 error = fo_mmap(fp, &vms->vm_map, &addr, size, prot,
367 cap_maxprot, flags, pos, td);
371 td->td_retval[0] = (register_t) (addr + pageoff);
379 #if defined(COMPAT_FREEBSD6)
381 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
383 struct mmap_args oargs;
385 oargs.addr = uap->addr;
386 oargs.len = uap->len;
387 oargs.prot = uap->prot;
388 oargs.flags = uap->flags;
390 oargs.pos = uap->pos;
391 return (sys_mmap(td, &oargs));
396 #ifndef _SYS_SYSPROTO_H_
409 struct ommap_args *uap;
411 struct mmap_args nargs;
412 static const char cvtbsdprot[8] = {
416 PROT_EXEC | PROT_WRITE,
418 PROT_EXEC | PROT_READ,
419 PROT_WRITE | PROT_READ,
420 PROT_EXEC | PROT_WRITE | PROT_READ,
423 #define OMAP_ANON 0x0002
424 #define OMAP_COPY 0x0020
425 #define OMAP_SHARED 0x0010
426 #define OMAP_FIXED 0x0100
428 nargs.addr = uap->addr;
429 nargs.len = uap->len;
430 nargs.prot = cvtbsdprot[uap->prot & 0x7];
431 #ifdef COMPAT_FREEBSD32
432 #if defined(__amd64__)
433 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
435 nargs.prot |= PROT_EXEC;
439 if (uap->flags & OMAP_ANON)
440 nargs.flags |= MAP_ANON;
441 if (uap->flags & OMAP_COPY)
442 nargs.flags |= MAP_COPY;
443 if (uap->flags & OMAP_SHARED)
444 nargs.flags |= MAP_SHARED;
446 nargs.flags |= MAP_PRIVATE;
447 if (uap->flags & OMAP_FIXED)
448 nargs.flags |= MAP_FIXED;
450 nargs.pos = uap->pos;
451 return (sys_mmap(td, &nargs));
453 #endif /* COMPAT_43 */
456 #ifndef _SYS_SYSPROTO_H_
469 struct msync_args *uap;
472 vm_size_t size, pageoff;
477 addr = (vm_offset_t) uap->addr;
481 pageoff = (addr & PAGE_MASK);
484 size = (vm_size_t) round_page(size);
485 if (addr + size < addr)
488 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
491 map = &td->td_proc->p_vmspace->vm_map;
494 * Clean the pages and interpret the return value.
496 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
497 (flags & MS_INVALIDATE) != 0);
501 case KERN_INVALID_ADDRESS:
503 case KERN_INVALID_ARGUMENT:
512 #ifndef _SYS_SYSPROTO_H_
524 struct munmap_args *uap;
527 struct pmckern_map_out pkm;
528 vm_map_entry_t entry;
531 vm_size_t size, pageoff;
534 addr = (vm_offset_t) uap->addr;
539 pageoff = (addr & PAGE_MASK);
542 size = (vm_size_t) round_page(size);
543 if (addr + size < addr)
547 * Check for illegal addresses. Watch out for address wrap...
549 map = &td->td_proc->p_vmspace->vm_map;
550 if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
555 * Inform hwpmc if the address range being unmapped contains
556 * an executable region.
558 pkm.pm_address = (uintptr_t) NULL;
559 if (vm_map_lookup_entry(map, addr, &entry)) {
561 entry != &map->header && entry->start < addr + size;
562 entry = entry->next) {
563 if (vm_map_check_protection(map, entry->start,
564 entry->end, VM_PROT_EXECUTE) == TRUE) {
565 pkm.pm_address = (uintptr_t) addr;
566 pkm.pm_size = (size_t) size;
572 vm_map_delete(map, addr, addr + size);
575 /* downgrade the lock to prevent a LOR with the pmc-sx lock */
576 vm_map_lock_downgrade(map);
577 if (pkm.pm_address != (uintptr_t) NULL)
578 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
579 vm_map_unlock_read(map);
583 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */
587 #ifndef _SYS_SYSPROTO_H_
588 struct mprotect_args {
598 sys_mprotect(td, uap)
600 struct mprotect_args *uap;
603 vm_size_t size, pageoff;
606 addr = (vm_offset_t) uap->addr;
608 prot = uap->prot & VM_PROT_ALL;
610 pageoff = (addr & PAGE_MASK);
613 size = (vm_size_t) round_page(size);
614 if (addr + size < addr)
617 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr,
618 addr + size, prot, FALSE)) {
621 case KERN_PROTECTION_FAILURE:
623 case KERN_RESOURCE_SHORTAGE:
629 #ifndef _SYS_SYSPROTO_H_
630 struct minherit_args {
640 sys_minherit(td, uap)
642 struct minherit_args *uap;
645 vm_size_t size, pageoff;
646 vm_inherit_t inherit;
648 addr = (vm_offset_t)uap->addr;
650 inherit = uap->inherit;
652 pageoff = (addr & PAGE_MASK);
655 size = (vm_size_t) round_page(size);
656 if (addr + size < addr)
659 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr,
660 addr + size, inherit)) {
663 case KERN_PROTECTION_FAILURE:
669 #ifndef _SYS_SYSPROTO_H_
670 struct madvise_args {
683 struct madvise_args *uap;
685 vm_offset_t start, end;
690 * Check for our special case, advising the swap pager we are
693 if (uap->behav == MADV_PROTECT) {
695 return (kern_procctl(td, P_PID, td->td_proc->p_pid,
696 PROC_SPROTECT, &flags));
700 * Check for illegal behavior
702 if (uap->behav < 0 || uap->behav > MADV_CORE)
705 * Check for illegal addresses. Watch out for address wrap... Note
706 * that VM_*_ADDRESS are not constants due to casts (argh).
708 map = &td->td_proc->p_vmspace->vm_map;
709 if ((vm_offset_t)uap->addr < vm_map_min(map) ||
710 (vm_offset_t)uap->addr + uap->len > vm_map_max(map))
712 if (((vm_offset_t) uap->addr + uap->len) < (vm_offset_t) uap->addr)
716 * Since this routine is only advisory, we default to conservative
719 start = trunc_page((vm_offset_t) uap->addr);
720 end = round_page((vm_offset_t) uap->addr + uap->len);
722 if (vm_map_madvise(map, start, end, uap->behav))
727 #ifndef _SYS_SYSPROTO_H_
728 struct mincore_args {
741 struct mincore_args *uap;
743 vm_offset_t addr, first_addr;
744 vm_offset_t end, cend;
749 int vecindex, lastvecindex;
750 vm_map_entry_t current;
751 vm_map_entry_t entry;
753 vm_paddr_t locked_pa;
757 unsigned int timestamp;
761 * Make sure that the addresses presented are valid for user
764 first_addr = addr = trunc_page((vm_offset_t) uap->addr);
765 end = addr + (vm_size_t)round_page(uap->len);
766 map = &td->td_proc->p_vmspace->vm_map;
767 if (end > vm_map_max(map) || end < addr)
771 * Address of byte vector
775 pmap = vmspace_pmap(td->td_proc->p_vmspace);
777 vm_map_lock_read(map);
779 timestamp = map->timestamp;
781 if (!vm_map_lookup_entry(map, addr, &entry)) {
782 vm_map_unlock_read(map);
787 * Do this on a map entry basis so that if the pages are not
788 * in the current processes address space, we can easily look
789 * up the pages elsewhere.
792 for (current = entry;
793 (current != &map->header) && (current->start < end);
794 current = current->next) {
797 * check for contiguity
799 if (current->end < end &&
800 (entry->next == &map->header ||
801 current->next->start > current->end)) {
802 vm_map_unlock_read(map);
807 * ignore submaps (for now) or null objects
809 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
810 current->object.vm_object == NULL)
814 * limit this scan to the current map entry and the
815 * limits for the mincore call
817 if (addr < current->start)
818 addr = current->start;
824 * scan this entry one page at a time
826 while (addr < cend) {
828 * Check pmap first, it is likely faster, also
829 * it can provide info as to whether we are the
830 * one referencing or modifying the page.
836 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa);
837 if (locked_pa != 0) {
839 * The page is mapped by this process but not
840 * both accessed and modified. It is also
841 * managed. Acquire the object lock so that
842 * other mappings might be examined.
844 m = PHYS_TO_VM_PAGE(locked_pa);
845 if (m->object != object) {
847 VM_OBJECT_WUNLOCK(object);
849 locked = VM_OBJECT_TRYWLOCK(object);
852 VM_OBJECT_WLOCK(object);
858 KASSERT(m->valid == VM_PAGE_BITS_ALL,
859 ("mincore: page %p is mapped but invalid",
861 } else if (mincoreinfo == 0) {
863 * The page is not mapped by this process. If
864 * the object implements managed pages, then
865 * determine if the page is resident so that
866 * the mappings might be examined.
868 if (current->object.vm_object != object) {
870 VM_OBJECT_WUNLOCK(object);
871 object = current->object.vm_object;
872 VM_OBJECT_WLOCK(object);
874 if (object->type == OBJT_DEFAULT ||
875 object->type == OBJT_SWAP ||
876 object->type == OBJT_VNODE) {
877 pindex = OFF_TO_IDX(current->offset +
878 (addr - current->start));
879 m = vm_page_lookup(object, pindex);
880 if (m != NULL && m->valid == 0)
883 mincoreinfo = MINCORE_INCORE;
887 /* Examine other mappings to the page. */
888 if (m->dirty == 0 && pmap_is_modified(m))
891 mincoreinfo |= MINCORE_MODIFIED_OTHER;
893 * The first test for PGA_REFERENCED is an
894 * optimization. The second test is
895 * required because a concurrent pmap
896 * operation could clear the last reference
897 * and set PGA_REFERENCED before the call to
898 * pmap_is_referenced().
900 if ((m->aflags & PGA_REFERENCED) != 0 ||
901 pmap_is_referenced(m) ||
902 (m->aflags & PGA_REFERENCED) != 0)
903 mincoreinfo |= MINCORE_REFERENCED_OTHER;
906 VM_OBJECT_WUNLOCK(object);
909 * subyte may page fault. In case it needs to modify
910 * the map, we release the lock.
912 vm_map_unlock_read(map);
915 * calculate index into user supplied byte vector
917 vecindex = OFF_TO_IDX(addr - first_addr);
920 * If we have skipped map entries, we need to make sure that
921 * the byte vector is zeroed for those skipped entries.
923 while ((lastvecindex + 1) < vecindex) {
925 error = subyte(vec + lastvecindex, 0);
933 * Pass the page information to the user
935 error = subyte(vec + vecindex, mincoreinfo);
942 * If the map has changed, due to the subyte, the previous
943 * output may be invalid.
945 vm_map_lock_read(map);
946 if (timestamp != map->timestamp)
949 lastvecindex = vecindex;
955 * subyte may page fault. In case it needs to modify
956 * the map, we release the lock.
958 vm_map_unlock_read(map);
961 * Zero the last entries in the byte vector.
963 vecindex = OFF_TO_IDX(end - first_addr);
964 while ((lastvecindex + 1) < vecindex) {
966 error = subyte(vec + lastvecindex, 0);
974 * If the map has changed, due to the subyte, the previous
975 * output may be invalid.
977 vm_map_lock_read(map);
978 if (timestamp != map->timestamp)
980 vm_map_unlock_read(map);
985 #ifndef _SYS_SYSPROTO_H_
997 struct mlock_args *uap;
1000 return (vm_mlock(td->td_proc, td->td_ucred, uap->addr, uap->len));
1004 vm_mlock(struct proc *proc, struct ucred *cred, const void *addr0, size_t len)
1006 vm_offset_t addr, end, last, start;
1007 vm_size_t npages, size;
1009 unsigned long nsize;
1012 error = priv_check_cred(cred, PRIV_VM_MLOCK, 0);
1015 addr = (vm_offset_t)addr0;
1018 start = trunc_page(addr);
1019 end = round_page(last);
1020 if (last < addr || end < addr)
1022 npages = atop(end - start);
1023 if (npages > vm_page_max_wired)
1025 map = &proc->p_vmspace->vm_map;
1027 nsize = ptoa(npages + pmap_wired_count(map->pmap));
1028 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) {
1033 if (npages + vm_cnt.v_wire_count > vm_page_max_wired)
1038 error = racct_set(proc, RACCT_MEMLOCK, nsize);
1044 error = vm_map_wire(map, start, end,
1045 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1047 if (racct_enable && error != KERN_SUCCESS) {
1049 racct_set(proc, RACCT_MEMLOCK,
1050 ptoa(pmap_wired_count(map->pmap)));
1054 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1057 #ifndef _SYS_SYSPROTO_H_
1058 struct mlockall_args {
1067 sys_mlockall(td, uap)
1069 struct mlockall_args *uap;
1074 map = &td->td_proc->p_vmspace->vm_map;
1075 error = priv_check(td, PRIV_VM_MLOCK);
1079 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
1083 * If wiring all pages in the process would cause it to exceed
1084 * a hard resource limit, return ENOMEM.
1086 if (!old_mlock && uap->how & MCL_CURRENT) {
1087 PROC_LOCK(td->td_proc);
1088 if (map->size > lim_cur(td, RLIMIT_MEMLOCK)) {
1089 PROC_UNLOCK(td->td_proc);
1092 PROC_UNLOCK(td->td_proc);
1096 PROC_LOCK(td->td_proc);
1097 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
1098 PROC_UNLOCK(td->td_proc);
1104 if (uap->how & MCL_FUTURE) {
1106 vm_map_modflags(map, MAP_WIREFUTURE, 0);
1111 if (uap->how & MCL_CURRENT) {
1113 * P1003.1-2001 mandates that all currently mapped pages
1114 * will be memory resident and locked (wired) upon return
1115 * from mlockall(). vm_map_wire() will wire pages, by
1116 * calling vm_fault_wire() for each page in the region.
1118 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
1119 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1120 error = (error == KERN_SUCCESS ? 0 : EAGAIN);
1123 if (racct_enable && error != KERN_SUCCESS) {
1124 PROC_LOCK(td->td_proc);
1125 racct_set(td->td_proc, RACCT_MEMLOCK,
1126 ptoa(pmap_wired_count(map->pmap)));
1127 PROC_UNLOCK(td->td_proc);
1134 #ifndef _SYS_SYSPROTO_H_
1135 struct munlockall_args {
1144 sys_munlockall(td, uap)
1146 struct munlockall_args *uap;
1151 map = &td->td_proc->p_vmspace->vm_map;
1152 error = priv_check(td, PRIV_VM_MUNLOCK);
1156 /* Clear the MAP_WIREFUTURE flag from this vm_map. */
1158 vm_map_modflags(map, 0, MAP_WIREFUTURE);
1161 /* Forcibly unwire all pages. */
1162 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
1163 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1165 if (racct_enable && error == KERN_SUCCESS) {
1166 PROC_LOCK(td->td_proc);
1167 racct_set(td->td_proc, RACCT_MEMLOCK, 0);
1168 PROC_UNLOCK(td->td_proc);
1175 #ifndef _SYS_SYSPROTO_H_
1176 struct munlock_args {
1185 sys_munlock(td, uap)
1187 struct munlock_args *uap;
1189 vm_offset_t addr, end, last, start;
1196 error = priv_check(td, PRIV_VM_MUNLOCK);
1199 addr = (vm_offset_t)uap->addr;
1202 start = trunc_page(addr);
1203 end = round_page(last);
1204 if (last < addr || end < addr)
1206 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
1207 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1209 if (racct_enable && error == KERN_SUCCESS) {
1210 PROC_LOCK(td->td_proc);
1211 map = &td->td_proc->p_vmspace->vm_map;
1212 racct_set(td->td_proc, RACCT_MEMLOCK,
1213 ptoa(pmap_wired_count(map->pmap)));
1214 PROC_UNLOCK(td->td_proc);
1217 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1223 * Helper function for vm_mmap. Perform sanity check specific for mmap
1224 * operations on vnodes.
1227 vm_mmap_vnode(struct thread *td, vm_size_t objsize,
1228 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1229 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp,
1230 boolean_t *writecounted)
1236 int error, flags, locktype;
1238 cred = td->td_ucred;
1239 if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED))
1240 locktype = LK_EXCLUSIVE;
1242 locktype = LK_SHARED;
1243 if ((error = vget(vp, locktype, td)) != 0)
1245 AUDIT_ARG_VNODE1(vp);
1249 if (vp->v_type == VREG) {
1251 * Get the proper underlying object
1257 if (obj->type == OBJT_VNODE && obj->handle != vp) {
1259 vp = (struct vnode *)obj->handle;
1261 * Bypass filesystems obey the mpsafety of the
1262 * underlying fs. Tmpfs never bypasses.
1264 error = vget(vp, locktype, td);
1268 if (locktype == LK_EXCLUSIVE) {
1269 *writecounted = TRUE;
1270 vnode_pager_update_writecount(obj, 0, objsize);
1276 if ((error = VOP_GETATTR(vp, &va, cred)))
1279 /* This relies on VM_PROT_* matching PROT_*. */
1280 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags);
1284 if ((flags & MAP_SHARED) != 0) {
1285 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
1286 if (prot & VM_PROT_WRITE) {
1290 *maxprotp &= ~VM_PROT_WRITE;
1294 * If it is a regular file without any references
1295 * we do not need to sync it.
1296 * Adjust object size to be the size of actual file.
1298 objsize = round_page(va.va_size);
1299 if (va.va_nlink == 0)
1300 flags |= MAP_NOSYNC;
1301 if (obj->type == OBJT_VNODE) {
1302 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
1309 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP,
1310 ("wrong object type"));
1311 VM_OBJECT_WLOCK(obj);
1312 vm_object_reference_locked(obj);
1313 #if VM_NRESERVLEVEL > 0
1314 vm_object_color(obj, 0);
1316 VM_OBJECT_WUNLOCK(obj);
1321 vfs_mark_atime(vp, cred);
1324 if (error != 0 && *writecounted) {
1325 *writecounted = FALSE;
1326 vnode_pager_update_writecount(obj, objsize, 0);
1337 * Helper function for vm_mmap. Perform sanity check specific for mmap
1338 * operations on cdevs.
1341 vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot,
1342 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw,
1343 vm_ooffset_t *foff, vm_object_t *objp)
1350 if (dsw->d_flags & D_MMAP_ANON) {
1353 *maxprotp = VM_PROT_ALL;
1354 *flagsp |= MAP_ANON;
1358 * cdevs do not provide private mappings of any kind.
1360 if ((*maxprotp & VM_PROT_WRITE) == 0 &&
1361 (prot & VM_PROT_WRITE) != 0)
1363 if (flags & (MAP_PRIVATE|MAP_COPY))
1366 * Force device mappings to be shared.
1368 flags |= MAP_SHARED;
1370 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot);
1375 * First, try d_mmap_single(). If that is not implemented
1376 * (returns ENODEV), fall back to using the device pager.
1377 * Note that d_mmap_single() must return a reference to the
1378 * object (it needs to bump the reference count of the object
1379 * it returns somehow).
1381 * XXX assumes VM_PROT_* == PROT_*
1383 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
1384 if (error != ENODEV)
1386 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
1398 * Internal version of mmap used by exec, sys5 shared memory, and
1399 * various device drivers. Handle is either a vnode pointer, a
1400 * character device, or NULL for MAP_ANON.
1403 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1404 vm_prot_t maxprot, int flags,
1405 objtype_t handle_type, void *handle,
1409 struct thread *td = curthread;
1411 boolean_t writecounted;
1416 size = round_page(size);
1418 writecounted = FALSE;
1421 * Lookup/allocate object.
1423 switch (handle_type) {
1430 dsw = dev_refthread(cdev, &ref);
1433 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev,
1434 dsw, &foff, &object);
1435 dev_relthread(cdev, ref);
1439 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
1440 handle, &foff, &object, &writecounted);
1443 if (handle == NULL) {
1455 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
1456 foff, writecounted, td);
1457 if (error != 0 && object != NULL) {
1459 * If this mapping was accounted for in the vnode's
1460 * writecount, then undo that now.
1463 vnode_pager_release_writecount(object, 0, size);
1464 vm_object_deallocate(object);
1470 * Internal version of mmap that maps a specific VM object into an
1471 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap.
1474 vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1475 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff,
1476 boolean_t writecounted, struct thread *td)
1479 int docow, error, findspace, rv;
1481 if (map == &td->td_proc->p_vmspace->vm_map) {
1482 PROC_LOCK(td->td_proc);
1483 if (map->size + size > lim_cur_proc(td->td_proc, RLIMIT_VMEM)) {
1484 PROC_UNLOCK(td->td_proc);
1487 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
1488 PROC_UNLOCK(td->td_proc);
1491 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
1492 if (ptoa(pmap_wired_count(map->pmap)) + size >
1493 lim_cur_proc(td->td_proc, RLIMIT_MEMLOCK)) {
1494 racct_set_force(td->td_proc, RACCT_VMEM,
1496 PROC_UNLOCK(td->td_proc);
1499 error = racct_set(td->td_proc, RACCT_MEMLOCK,
1500 ptoa(pmap_wired_count(map->pmap)) + size);
1502 racct_set_force(td->td_proc, RACCT_VMEM,
1504 PROC_UNLOCK(td->td_proc);
1508 PROC_UNLOCK(td->td_proc);
1512 * We currently can only deal with page aligned file offsets.
1513 * The mmap() system call already enforces this by subtracting
1514 * the page offset from the file offset, but checking here
1515 * catches errors in device drivers (e.g. d_single_mmap()
1516 * callbacks) and other internal mapping requests (such as in
1519 if (foff & PAGE_MASK)
1522 if ((flags & MAP_FIXED) == 0) {
1524 *addr = round_page(*addr);
1526 if (*addr != trunc_page(*addr))
1531 if (flags & MAP_ANON) {
1532 if (object != NULL || foff != 0)
1535 } else if (flags & MAP_PREFAULT_READ)
1536 docow = MAP_PREFAULT;
1538 docow = MAP_PREFAULT_PARTIAL;
1540 if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
1541 docow |= MAP_COPY_ON_WRITE;
1542 if (flags & MAP_NOSYNC)
1543 docow |= MAP_DISABLE_SYNCER;
1544 if (flags & MAP_NOCORE)
1545 docow |= MAP_DISABLE_COREDUMP;
1546 /* Shared memory is also shared with children. */
1547 if (flags & MAP_SHARED)
1548 docow |= MAP_INHERIT_SHARE;
1550 docow |= MAP_VN_WRITECOUNT;
1551 if (flags & MAP_STACK) {
1554 docow |= MAP_STACK_GROWS_DOWN;
1556 if ((flags & MAP_EXCL) != 0)
1557 docow |= MAP_CHECK_EXCL;
1560 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
1561 findspace = VMFS_SUPER_SPACE;
1562 else if ((flags & MAP_ALIGNMENT_MASK) != 0)
1563 findspace = VMFS_ALIGNED_SPACE(flags >>
1564 MAP_ALIGNMENT_SHIFT);
1566 findspace = VMFS_OPTIMAL_SPACE;
1567 rv = vm_map_find(map, object, foff, addr, size,
1569 flags & MAP_32BIT ? MAP_32BIT_MAX_ADDR :
1571 0, findspace, prot, maxprot, docow);
1573 rv = vm_map_fixed(map, object, foff, *addr, size,
1574 prot, maxprot, docow);
1577 if (rv == KERN_SUCCESS) {
1579 * If the process has requested that all future mappings
1580 * be wired, then heed this.
1582 if (map->flags & MAP_WIREFUTURE) {
1583 vm_map_wire(map, *addr, *addr + size,
1584 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ?
1585 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES));
1588 return (vm_mmap_to_errno(rv));
1592 * Translate a Mach VM return code to zero on success or the appropriate errno
1596 vm_mmap_to_errno(int rv)
1602 case KERN_INVALID_ADDRESS:
1605 case KERN_PROTECTION_FAILURE: