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(td, uap)
  75         struct thread *td;
  76         struct obreak_args *uap;
  77 {
  78         struct vmspace *vm = td->td_proc->p_vmspace;
  79         vm_map_t map = &vm->vm_map;
  80         vm_offset_t new, old, base;
  81         rlim_t datalim, lmemlim, vmemlim;
  82         int prot, rv;
  83         int error = 0;
  84         boolean_t do_map_wirefuture;
  85
  86         PROC_LOCK(td->td_proc);
  87         datalim = lim_cur(td->td_proc, RLIMIT_DATA);
  88         lmemlim = lim_cur(td->td_proc, RLIMIT_MEMLOCK);
  89         vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM);
  90         PROC_UNLOCK(td->td_proc);
  91
  92         do_map_wirefuture = FALSE;
  93         new = round_page((vm_offset_t)uap->nsize);
  94         vm_map_lock(map);
  95
  96         base = round_page((vm_offset_t) vm->vm_daddr);
  97         old = base + ctob(vm->vm_dsize);
  98         if (new > base) {
  99                 /*
 100                  * Check the resource limit, but allow a process to reduce
 101                  * its usage, even if it remains over the limit.
 102                  */
 103                 if (new - base > datalim && new > old) {
 104                         error = ENOMEM;
 105                         goto done;
 106                 }
 107                 if (new > vm_map_max(map)) {
 108                         error = ENOMEM;
 109                         goto done;
 110                 }
 111         } else if (new < base) {
 112                 /*
 113                  * This is simply an invalid value.  If someone wants to
 114                  * do fancy address space manipulations, mmap and munmap
 115                  * can do most of what the user would want.
 116                  */
 117                 error = EINVAL;
 118                 goto done;
 119         }
 120         if (new > old) {
 121                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 122                         if (ptoa(pmap_wired_count(map->pmap)) +
 123                             (new - old) > lmemlim) {
 124                                 error = ENOMEM;
 125                                 goto done;
 126                         }
 127                 }
 128                 if (map->size + (new - old) > vmemlim) {
 129                         error = ENOMEM;
 130                         goto done;
 131                 }
 132 #ifdef RACCT
 133                 if (racct_enable) {
 134                         PROC_LOCK(td->td_proc);
 135                         error = racct_set(td->td_proc, RACCT_DATA, new - base);
 136                         if (error != 0) {
 137                                 PROC_UNLOCK(td->td_proc);
 138                                 error = ENOMEM;
 139                                 goto done;
 140                         }
 141                         error = racct_set(td->td_proc, RACCT_VMEM,
 142                             map->size + (new - old));
 143                         if (error != 0) {
 144                                 racct_set_force(td->td_proc, RACCT_DATA,
 145                                     old - base);
 146                                 PROC_UNLOCK(td->td_proc);
 147                                 error = ENOMEM;
 148                                 goto done;
 149                         }
 150                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 151                                 error = racct_set(td->td_proc, RACCT_MEMLOCK,
 152                                     ptoa(pmap_wired_count(map->pmap)) +
 153                                     (new - old));
 154                                 if (error != 0) {
 155                                         racct_set_force(td->td_proc, RACCT_DATA,
 156                                             old - base);
 157                                         racct_set_force(td->td_proc, RACCT_VMEM,
 158                                             map->size);
 159                                         PROC_UNLOCK(td->td_proc);
 160                                         error = ENOMEM;
 161                                         goto done;
 162                                 }
 163                         }
 164                         PROC_UNLOCK(td->td_proc);
 165                 }
 166 #endif
 167                 prot = VM_PROT_RW;
 168 #ifdef COMPAT_FREEBSD32
 169 #if defined(__amd64__) || defined(__ia64__)
 170                 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
 171                         prot |= VM_PROT_EXECUTE;
 172 #endif
 173 #endif
 174                 rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL, 0);
 175                 if (rv != KERN_SUCCESS) {
 176 #ifdef RACCT
 177                         if (racct_enable) {
 178                                 PROC_LOCK(td->td_proc);
 179                                 racct_set_force(td->td_proc,
 180                                     RACCT_DATA, old - base);
 181                                 racct_set_force(td->td_proc,
 182                                     RACCT_VMEM, map->size);
 183                                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 184                                         racct_set_force(td->td_proc,
 185                                             RACCT_MEMLOCK,
 186                                             ptoa(pmap_wired_count(map->pmap)));
 187                                 }
 188                                 PROC_UNLOCK(td->td_proc);
 189                         }
 190 #endif
 191                         error = ENOMEM;
 192                         goto done;
 193                 }
 194                 vm->vm_dsize += btoc(new - old);
 195                 /*
 196                  * Handle the MAP_WIREFUTURE case for legacy applications,
 197                  * by marking the newly mapped range of pages as wired.
 198                  * We are not required to perform a corresponding
 199                  * vm_map_unwire() before vm_map_delete() below, as
 200                  * it will forcibly unwire the pages in the range.
 201                  *
 202                  * XXX If the pages cannot be wired, no error is returned.
 203                  */
 204                 if ((map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) {
 205                         if (bootverbose)
 206                                 printf("obreak: MAP_WIREFUTURE set\n");
 207                         do_map_wirefuture = TRUE;
 208                 }
 209         } else if (new < old) {
 210                 rv = vm_map_delete(map, new, old);
 211                 if (rv != KERN_SUCCESS) {
 212                         error = ENOMEM;
 213                         goto done;
 214                 }
 215                 vm->vm_dsize -= btoc(old - new);
 216 #ifdef RACCT
 217                 if (racct_enable) {
 218                         PROC_LOCK(td->td_proc);
 219                         racct_set_force(td->td_proc, RACCT_DATA, new - base);
 220                         racct_set_force(td->td_proc, RACCT_VMEM, map->size);
 221                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
 222                                 racct_set_force(td->td_proc, RACCT_MEMLOCK,
 223                                     ptoa(pmap_wired_count(map->pmap)));
 224                         }
 225                         PROC_UNLOCK(td->td_proc);
 226                 }
 227 #endif
 228         }
 229 done:
 230         vm_map_unlock(map);
 231
 232         if (do_map_wirefuture)
 233                 (void) vm_map_wire(map, old, new,
 234                     VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
 235
 236         return (error);
 237 }
 238
 239 #ifndef _SYS_SYSPROTO_H_
 240 struct ovadvise_args {
 241         int anom;
 242 };
 243 #endif
 244
 245 /*
 246  * MPSAFE
 247  */
 248 /* ARGSUSED */
 249 int
 250 sys_ovadvise(td, uap)
 251         struct thread *td;
 252         struct ovadvise_args *uap;
 253 {
 254         /* START_GIANT_OPTIONAL */
 255         /* END_GIANT_OPTIONAL */
 256         return (EINVAL);
 257 }