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