sys/vm/vm_unix.c

   1 /*-
   2  * Copyright (c) 1988 University of Utah.
   3  * Copyright (c) 1991, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * the Systems Programming Group of the University of Utah Computer
   8  * Science Department.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  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.
  21  *
  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
  32  * SUCH DAMAGE.
  33  *
  34  * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
  35  *
  36  *      @(#)vm_unix.c   8.1 (Berkeley) 6/11/93
  37  */
  38
  39 #include "opt_compat.h"
  40
  41 /*
  42  * Traditional sbrk/grow interface to VM
  43  */
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include <sys/param.h>
  49 #include <sys/lock.h>
  50 #include <sys/mutex.h>
  51 #include <sys/proc.h>
  52 #include <sys/racct.h>
  53 #include <sys/resourcevar.h>
  54 #include <sys/sysent.h>
  55 #include <sys/sysproto.h>
  56 #include <sys/systm.h>
  57
  58 #include <vm/vm.h>
  59 #include <vm/vm_param.h>
  60 #include <vm/pmap.h>
  61 #include <vm/vm_map.h>
  62
  63 #ifndef _SYS_SYSPROTO_H_
  64 struct obreak_args {
  65         char *nsize;
  66 };
  67 #endif
  68
  69 /*
  70  * MPSAFE
  71  */
  72 /* ARGSUSED */
  73 int
  74 sys_obreak(struct thread *td, struct obreak_args *uap)
  75 {
  76         struct vmspace *vm = td->td_proc->p_vmspace;
  77         vm_map_t map = &vm->vm_map;
  78         vm_offset_t new, old, base;
  79         rlim_t datalim, lmemlim, vmemlim;
  80         int prot, rv;
  81         int error = 0;
  82         boolean_t do_map_wirefuture;
  83
  84         datalim = lim_cur(td, RLIMIT_DATA);
  85         lmemlim = lim_cur(td, RLIMIT_MEMLOCK);
  86         vmemlim = lim_cur(td, RLIMIT_VMEM);
  87
  88         do_map_wirefuture = FALSE;
  89         new = round_page((vm_offset_t)uap->nsize);
  90         vm_map_lock(map);
  91
  92         base = round_page((vm_offset_t) vm->vm_daddr);
  93         old = base + ctob(vm->vm_dsize);
  94         if (new > base) {
  95                 /*
  96                  * Check the resource limit, but allow a process to reduce
  97                  * its usage, even if it remains over the limit.
  98                  */
  99                 if (new - base > datalim && new > old) {
 100                         error = ENOMEM;
 101                         goto done;
 102                 }
 103                 if (new > vm_map_max(map)) {
 104                         error = ENOMEM;
 105                         goto done;
 106                 }
 107         } else if (new < base) {
 108                 /*
 109                  * This is simply an invalid value.  If someone wants to
 110                  * do fancy address space manipulations, mmap and munmap
 111                  * can do most of what the user would want.
 112                  */
 113                 error = EINVAL;
 114                 goto done;
 115         }
 116         if (new > old) {
 117                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 118                         if (ptoa(pmap_wired_count(map->pmap)) +
 119                             (new - old) > lmemlim) {
 120                                 error = ENOMEM;
 121                                 goto done;
 122                         }
 123                 }
 124                 if (map->size + (new - old) > vmemlim) {
 125                         error = ENOMEM;
 126                         goto done;
 127                 }
 128 #ifdef RACCT
 129                 if (racct_enable) {
 130                         PROC_LOCK(td->td_proc);
 131                         error = racct_set(td->td_proc, RACCT_DATA, new - base);
 132                         if (error != 0) {
 133                                 PROC_UNLOCK(td->td_proc);
 134                                 error = ENOMEM;
 135                                 goto done;
 136                         }
 137                         error = racct_set(td->td_proc, RACCT_VMEM,
 138                             map->size + (new - old));
 139                         if (error != 0) {
 140                                 racct_set_force(td->td_proc, RACCT_DATA,
 141                                     old - base);
 142                                 PROC_UNLOCK(td->td_proc);
 143                                 error = ENOMEM;
 144                                 goto done;
 145                         }
 146                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 147                                 error = racct_set(td->td_proc, RACCT_MEMLOCK,
 148                                     ptoa(pmap_wired_count(map->pmap)) +
 149                                     (new - old));
 150                                 if (error != 0) {
 151                                         racct_set_force(td->td_proc, RACCT_DATA,
 152                                             old - base);
 153                                         racct_set_force(td->td_proc, RACCT_VMEM,
 154                                             map->size);
 155                                         PROC_UNLOCK(td->td_proc);
 156                                         error = ENOMEM;
 157                                         goto done;
 158                                 }
 159                         }
 160                         PROC_UNLOCK(td->td_proc);
 161                 }
 162 #endif
 163                 prot = VM_PROT_RW;
 164 #ifdef COMPAT_FREEBSD32
 165 #if defined(__amd64__)
 166                 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
 167                         prot |= VM_PROT_EXECUTE;
 168 #endif
 169 #endif
 170                 rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL, 0);
 171                 if (rv != KERN_SUCCESS) {
 172 #ifdef RACCT
 173                         if (racct_enable) {
 174                                 PROC_LOCK(td->td_proc);
 175                                 racct_set_force(td->td_proc,
 176                                     RACCT_DATA, old - base);
 177                                 racct_set_force(td->td_proc,
 178                                     RACCT_VMEM, map->size);
 179                                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 180                                         racct_set_force(td->td_proc,
 181                                             RACCT_MEMLOCK,
 182                                             ptoa(pmap_wired_count(map->pmap)));
 183                                 }
 184                                 PROC_UNLOCK(td->td_proc);
 185                         }
 186 #endif
 187                         error = ENOMEM;
 188                         goto done;
 189                 }
 190                 vm->vm_dsize += btoc(new - old);
 191                 /*
 192                  * Handle the MAP_WIREFUTURE case for legacy applications,
 193                  * by marking the newly mapped range of pages as wired.
 194                  * We are not required to perform a corresponding
 195                  * vm_map_unwire() before vm_map_delete() below, as
 196                  * it will forcibly unwire the pages in the range.
 197                  *
 198                  * XXX If the pages cannot be wired, no error is returned.
 199                  */
 200                 if ((map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) {
 201                         if (bootverbose)
 202                                 printf("obreak: MAP_WIREFUTURE set\n");
 203                         do_map_wirefuture = TRUE;
 204                 }
 205         } else if (new < old) {
 206                 rv = vm_map_delete(map, new, old);
 207                 if (rv != KERN_SUCCESS) {
 208                         error = ENOMEM;
 209                         goto done;
 210                 }
 211                 vm->vm_dsize -= btoc(old - new);
 212 #ifdef RACCT
 213                 if (racct_enable) {
 214                         PROC_LOCK(td->td_proc);
 215                         racct_set_force(td->td_proc, RACCT_DATA, new - base);
 216                         racct_set_force(td->td_proc, RACCT_VMEM, map->size);
 217                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 218                                 racct_set_force(td->td_proc, RACCT_MEMLOCK,
 219                                     ptoa(pmap_wired_count(map->pmap)));
 220                         }
 221                         PROC_UNLOCK(td->td_proc);
 222                 }
 223 #endif
 224         }
 225 done:
 226         vm_map_unlock(map);
 227
 228         if (do_map_wirefuture)
 229                 (void) vm_map_wire(map, old, new,
 230                     VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
 231
 232         return (error);
 233 }
 234
 235 #ifndef _SYS_SYSPROTO_H_
 236 struct ovadvise_args {
 237         int anom;
 238 };
 239 #endif
 240
 241 /*
 242  * MPSAFE
 243  */
 244 /* ARGSUSED */
 245 int
 246 sys_ovadvise(struct thread *td, struct ovadvise_args *uap)
 247 {
 248         /* START_GIANT_OPTIONAL */
 249         /* END_GIANT_OPTIONAL */
 250         return (EINVAL);
 251 }