MFC - Fix VM panic. Add required overflow check for MAP_STACK and MAP_FIXED mmaps
[dragonfly.git] / sys / vm / vm_map.h
blob577dce31230f4b841499581371dd2e771ee5568c
1 /*
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. 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
34 * SUCH DAMAGE.
36 * @(#)vm_map.h 8.9 (Berkeley) 5/17/95
39 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
40 * All rights reserved.
42 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
44 * Permission to use, copy, modify and distribute this software and
45 * its documentation is hereby granted, provided that both the copyright
46 * notice and this permission notice appear in all copies of the
47 * software, derivative works or modified versions, and any portions
48 * thereof, and that both notices appear in supporting documentation.
50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
51 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
52 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
54 * Carnegie Mellon requests users of this software to return to
56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
57 * School of Computer Science
58 * Carnegie Mellon University
59 * Pittsburgh PA 15213-3890
61 * any improvements or extensions that they make and grant Carnegie the
62 * rights to redistribute these changes.
64 * $FreeBSD: src/sys/vm/vm_map.h,v 1.54.2.5 2003/01/13 22:51:17 dillon Exp $
65 * $DragonFly: src/sys/vm/vm_map.h,v 1.30 2007/04/29 18:25:41 dillon Exp $
69 * Virtual memory map module definitions.
72 #ifndef _VM_VM_MAP_H_
73 #define _VM_VM_MAP_H_
75 #ifndef _SYS_TYPES_H_
76 #include <sys/types.h>
77 #endif
78 #ifndef _SYS_TREE_H_
79 #include <sys/tree.h>
80 #endif
81 #ifndef _SYS_SYSREF_H_
82 #include <sys/sysref.h>
83 #endif
84 #ifndef _SYS_LOCK_H_
85 #include <sys/lock.h>
86 #endif
87 #ifndef _SYS_VKERNEL_H_
88 #include <sys/vkernel.h>
89 #endif
90 #ifndef _VM_VM_H_
91 #include <vm/vm.h>
92 #endif
93 #ifndef _MACHINE_PMAP_H_
94 #include <machine/pmap.h>
95 #endif
97 struct vm_map_rb_tree;
98 RB_PROTOTYPE(vm_map_rb_tree, vm_map_entry, rb_entry, rb_vm_map_compare);
101 * Types defined:
103 * vm_map_t the high-level address map data structure.
104 * vm_map_entry_t an entry in an address map.
107 typedef u_int vm_eflags_t;
110 * Objects which live in maps may be either VM objects, or
111 * another map (called a "sharing map") which denotes read-write
112 * sharing with other maps.
114 union vm_map_object {
115 struct vm_object *vm_object; /* object object */
116 struct vm_map *sub_map; /* belongs to another map */
119 union vm_map_aux {
120 vm_offset_t avail_ssize; /* amt can grow if this is a stack */
121 vpte_t master_pde; /* virtual page table root */
125 * Address map entries consist of start and end addresses,
126 * a VM object (or sharing map) and offset into that object,
127 * and user-exported inheritance and protection information.
128 * Also included is control information for virtual copy operations.
130 * When used with MAP_STACK, avail_ssize is used to determine the
131 * limits of stack growth.
133 * When used with VM_MAPTYPE_VPAGETABLE, avail_ssize stores the
134 * page directory index.
136 struct vm_map_entry {
137 struct vm_map_entry *prev; /* previous entry */
138 struct vm_map_entry *next; /* next entry */
139 RB_ENTRY(vm_map_entry) rb_entry;
140 vm_offset_t start; /* start address */
141 vm_offset_t end; /* end address */
142 union vm_map_aux aux; /* auxillary data */
143 union vm_map_object object; /* object I point to */
144 vm_ooffset_t offset; /* offset into object */
145 vm_eflags_t eflags; /* map entry flags */
146 vm_maptype_t maptype; /* type of VM mapping */
147 vm_prot_t protection; /* protection code */
148 vm_prot_t max_protection; /* maximum protection */
149 vm_inherit_t inheritance; /* inheritance */
150 int wired_count; /* can be paged if = 0 */
151 vm_pindex_t lastr; /* last read */
154 #define MAP_ENTRY_NOSYNC 0x0001
155 #define MAP_ENTRY_UNUSED0002 0x0002
156 #define MAP_ENTRY_COW 0x0004
157 #define MAP_ENTRY_NEEDS_COPY 0x0008
158 #define MAP_ENTRY_NOFAULT 0x0010
159 #define MAP_ENTRY_USER_WIRED 0x0020
161 #define MAP_ENTRY_BEHAV_NORMAL 0x0000 /* default behavior */
162 #define MAP_ENTRY_BEHAV_SEQUENTIAL 0x0040 /* expect sequential access */
163 #define MAP_ENTRY_BEHAV_RANDOM 0x0080 /* expect random access */
164 #define MAP_ENTRY_BEHAV_RESERVED 0x00C0 /* future use */
166 #define MAP_ENTRY_BEHAV_MASK 0x00C0
168 #define MAP_ENTRY_IN_TRANSITION 0x0100 /* entry being changed */
169 #define MAP_ENTRY_NEEDS_WAKEUP 0x0200 /* waiter's in transition */
170 #define MAP_ENTRY_NOCOREDUMP 0x0400 /* don't include in a core */
173 * flags for vm_map_[un]clip_range()
175 #define MAP_CLIP_NO_HOLES 0x0001
178 * This reserve count for vm_map_entry_reserve() should cover all nominal
179 * single-insertion operations, including any necessary clipping.
181 #define MAP_RESERVE_COUNT 4
182 #define MAP_RESERVE_SLOP 32
184 static __inline u_char
185 vm_map_entry_behavior(struct vm_map_entry *entry)
187 return entry->eflags & MAP_ENTRY_BEHAV_MASK;
190 static __inline void
191 vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
193 entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
194 (behavior & MAP_ENTRY_BEHAV_MASK);
198 * Maps are doubly-linked lists of map entries, kept sorted
199 * by address. A single hint is provided to start
200 * searches again from the last successful search,
201 * insertion, or removal.
203 * Note: the lock structure cannot be the first element of vm_map
204 * because this can result in a running lockup between two or more
205 * system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
206 * and free tsleep/waking up 'map' and the underlying lockmgr also
207 * sleeping and waking up on 'map'. The lockup occurs when the map fills
208 * up. The 'exec' map, for example.
210 struct vm_map {
211 struct vm_map_entry header; /* List of entries */
212 RB_HEAD(vm_map_rb_tree, vm_map_entry) rb_root;
213 struct lock lock; /* Lock for map data */
214 int nentries; /* Number of entries */
215 vm_size_t size; /* virtual size */
216 u_char system_map; /* Am I a system map? */
217 u_char infork; /* Am I in fork processing? */
218 vm_map_entry_t hint; /* hint for quick lookups */
219 unsigned int timestamp; /* Version number */
220 vm_map_entry_t first_free; /* First free space hint */
221 struct pmap *pmap; /* Physical map */
222 #define min_offset header.start
223 #define max_offset header.end
227 * Registered upcall
229 struct upcall;
231 struct vmupcall {
232 struct vmupcall *vu_next;
233 void *vu_func; /* user upcall function */
234 void *vu_data; /* user data */
235 void *vu_ctx; /* user context function */
236 struct lwp *vu_lwp; /* process that registered upcall */
237 int vu_id; /* upcall identifier */
238 int vu_pending; /* upcall request pending */
242 * Shareable process virtual address space.
244 * Refd pointers from vmresident, proc
246 struct vmspace {
247 struct vm_map vm_map; /* VM address map */
248 struct pmap vm_pmap; /* private physical map */
249 int vm_unused01;
250 caddr_t vm_shm; /* SYS5 shared memory private data XXX */
251 /* we copy from vm_startcopy to the end of the structure on fork */
252 #define vm_startcopy vm_rssize
253 segsz_t vm_rssize; /* current resident set size in pages */
254 segsz_t vm_swrss; /* resident set size before last swap */
255 segsz_t vm_tsize; /* text size (pages) XXX */
256 segsz_t vm_dsize; /* data size (pages) XXX */
257 segsz_t vm_ssize; /* stack size (pages) */
258 caddr_t vm_taddr; /* user virtual address of text XXX */
259 caddr_t vm_daddr; /* user virtual address of data XXX */
260 caddr_t vm_maxsaddr; /* user VA at max stack growth */
261 caddr_t vm_minsaddr; /* user VA at max stack growth */
262 #define vm_endcopy vm_exitingcnt
263 int vm_exitingcnt; /* several procsses zombied in exit1 */
264 int vm_upccount; /* number of registered upcalls */
265 int vm_pagesupply;
266 struct vmupcall *vm_upcalls; /* registered upcalls */
267 struct sysref vm_sysref; /* sysref, refcnt, etc */
271 * Resident executable holding structure. A user program can take a snapshot
272 * of just its VM address space (typically done just after dynamic link
273 * libraries have completed loading) and register it as a resident
274 * executable associated with the program binary's vnode, which is also
275 * locked into memory. Future execs of the vnode will start with a copy
276 * of the resident vmspace instead of running the binary from scratch,
277 * avoiding both the kernel ELF loader *AND* all shared library mapping and
278 * relocation code, and will call a different entry point (the stack pointer
279 * is reset to the top of the stack) supplied when the vmspace was registered.
281 struct vmresident {
282 struct vnode *vr_vnode; /* associated vnode */
283 TAILQ_ENTRY(vmresident) vr_link; /* linked list of res sts */
284 struct vmspace *vr_vmspace; /* vmspace to fork */
285 intptr_t vr_entry_addr; /* registered entry point */
286 struct sysentvec *vr_sysent; /* system call vects */
287 int vr_id; /* registration id */
290 #ifdef _KERNEL
292 * Macros: vm_map_lock, etc.
293 * Function:
294 * Perform locking on the data portion of a map. Note that
295 * these macros mimic procedure calls returning void. The
296 * semicolon is supplied by the user of these macros, not
297 * by the macros themselves. The macros can safely be used
298 * as unbraced elements in a higher level statement.
301 #ifdef DIAGNOSTIC
302 /* #define MAP_LOCK_DIAGNOSTIC 1 */
303 #ifdef MAP_LOCK_DIAGNOSTIC
304 #define vm_map_lock(map) \
305 do { \
306 kprintf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
307 if (lockmgr(&(map)->lock, LK_EXCLUSIVE) != 0) { \
308 panic("vm_map_lock: failed to get lock"); \
310 (map)->timestamp++; \
311 } while(0)
312 #else
313 #define vm_map_lock(map) \
314 do { \
315 if (lockmgr(&(map)->lock, LK_EXCLUSIVE) != 0) { \
316 panic("vm_map_lock: failed to get lock"); \
318 (map)->timestamp++; \
319 } while(0)
320 #endif
321 #else
322 #define vm_map_lock(map) \
323 do { \
324 lockmgr(&(map)->lock, LK_EXCLUSIVE); \
325 (map)->timestamp++; \
326 } while(0)
327 #endif /* DIAGNOSTIC */
329 #if defined(MAP_LOCK_DIAGNOSTIC)
330 #define vm_map_unlock(map) \
331 do { \
332 kprintf ("locking map LK_RELEASE: 0x%x\n", map); \
333 lockmgr(&(map)->lock, LK_RELEASE); \
334 } while (0)
335 #define vm_map_lock_read(map) \
336 do { \
337 kprintf ("locking map LK_SHARED: 0x%x\n", map); \
338 lockmgr(&(map)->lock, LK_SHARED); \
339 } while (0)
340 #define vm_map_unlock_read(map) \
341 do { \
342 kprintf ("locking map LK_RELEASE: 0x%x\n", map); \
343 lockmgr(&(map)->lock, LK_RELEASE); \
344 } while (0)
345 #else
346 #define vm_map_unlock(map) \
347 lockmgr(&(map)->lock, LK_RELEASE)
348 #define vm_map_lock_read(map) \
349 lockmgr(&(map)->lock, LK_SHARED)
350 #define vm_map_unlock_read(map) \
351 lockmgr(&(map)->lock, LK_RELEASE)
352 #endif
354 static __inline__ int
355 vm_map_lock_upgrade(vm_map_t map) {
356 int error;
357 #if defined(MAP_LOCK_DIAGNOSTIC)
358 kprintf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
359 #endif
360 error = lockmgr(&map->lock, LK_EXCLUPGRADE);
361 if (error == 0)
362 map->timestamp++;
363 return error;
366 #if defined(MAP_LOCK_DIAGNOSTIC)
367 #define vm_map_lock_downgrade(map) \
368 do { \
369 kprintf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
370 lockmgr(&(map)->lock, LK_DOWNGRADE); \
371 } while (0)
372 #else
373 #define vm_map_lock_downgrade(map) \
374 lockmgr(&(map)->lock, LK_DOWNGRADE)
375 #endif
377 #endif /* _KERNEL */
380 * Functions implemented as macros
382 #define vm_map_min(map) ((map)->min_offset)
383 #define vm_map_max(map) ((map)->max_offset)
384 #define vm_map_pmap(map) ((map)->pmap)
386 static __inline struct pmap *
387 vmspace_pmap(struct vmspace *vmspace)
389 return &vmspace->vm_pmap;
392 static __inline long
393 vmspace_resident_count(struct vmspace *vmspace)
395 return pmap_resident_count(vmspace_pmap(vmspace));
399 * Number of kernel maps and entries to statically allocate, required
400 * during boot to bootstrap the VM system.
402 #define MAX_KMAP 10
403 #define MAX_MAPENT 256
406 * Copy-on-write flags for vm_map operations
408 #define MAP_UNUSED_01 0x0001
409 #define MAP_COPY_ON_WRITE 0x0002
410 #define MAP_NOFAULT 0x0004
411 #define MAP_PREFAULT 0x0008
412 #define MAP_PREFAULT_PARTIAL 0x0010
413 #define MAP_DISABLE_SYNCER 0x0020
414 #define MAP_DISABLE_COREDUMP 0x0100
415 #define MAP_PREFAULT_MADVISE 0x0200 /* from (user) madvise request */
418 * vm_fault option flags
420 #define VM_FAULT_NORMAL 0x00 /* Nothing special */
421 #define VM_FAULT_CHANGE_WIRING 0x01 /* Change the wiring as appropriate */
422 #define VM_FAULT_USER_WIRE 0x02 /* Likewise, but for user purposes */
423 #define VM_FAULT_DIRTY 0x08 /* Dirty the page */
424 #define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
426 #ifdef _KERNEL
428 extern struct sysref_class vmspace_sysref_class;
430 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
431 struct pmap;
432 struct globaldata;
433 void vm_map_entry_allocate_object(vm_map_entry_t);
434 void vm_map_entry_reserve_cpu_init(struct globaldata *gd);
435 int vm_map_entry_reserve(int);
436 int vm_map_entry_kreserve(int);
437 void vm_map_entry_release(int);
438 void vm_map_entry_krelease(int);
439 vm_map_t vm_map_create (vm_map_t, struct pmap *, vm_offset_t, vm_offset_t);
440 int vm_map_delete (vm_map_t, vm_offset_t, vm_offset_t, int *);
441 int vm_map_find (vm_map_t, vm_object_t, vm_ooffset_t,
442 vm_offset_t *, vm_size_t,
443 boolean_t,
444 vm_maptype_t,
445 vm_prot_t, vm_prot_t,
446 int);
447 int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_offset_t, vm_offset_t *);
448 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
449 void vm_map_init (struct vm_map *, vm_offset_t, vm_offset_t, pmap_t);
450 int vm_map_insert (vm_map_t, int *, vm_object_t, vm_ooffset_t,
451 vm_offset_t, vm_offset_t,
452 vm_maptype_t,
453 vm_prot_t, vm_prot_t,
454 int);
455 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
456 vm_pindex_t *, vm_prot_t *, boolean_t *);
457 void vm_map_lookup_done (vm_map_t, vm_map_entry_t, int);
458 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
459 int vm_map_wire (vm_map_t, vm_offset_t, vm_offset_t, int);
460 int vm_map_unwire (vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
461 int vm_map_clean (vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
462 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
463 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
464 void vm_map_startup (void);
465 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
466 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int, off_t);
467 void vm_map_simplify_entry (vm_map_t, vm_map_entry_t, int *);
468 void vm_init2 (void);
469 int vm_uiomove (vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *);
470 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, boolean_t,
471 vm_prot_t, vm_prot_t, int);
472 int vm_map_growstack (struct proc *p, vm_offset_t addr);
473 int vmspace_swap_count (struct vmspace *vmspace);
474 int vmspace_anonymous_count (struct vmspace *vmspace);
475 void vm_map_set_wired_quick(vm_map_t map, vm_offset_t addr, vm_size_t size, int *);
477 #endif
478 #endif /* _VM_VM_MAP_H_ */