vm_unix.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1988 University of Utah.
    5  * Copyright (c) 1991, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * the Systems Programming Group of the University of Utah Computer
   10  * Science Department.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. 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.
   23  *
   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.
   35  *
   36  * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
   37  *
   38  *      @(#)vm_unix.c   8.1 (Berkeley) 6/11/93
   39  */
   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/syscallsubr.h>
   55 #include <sys/sysent.h>
   56 #include <sys/sysproto.h>
   57 #include <sys/systm.h>
   58 #if defined(__amd64__) || defined(__i386__) /* for i386_read_exec */
   59 #include <machine/md_var.h>
   60 #endif
   61 
   62 #include <vm/vm.h>
   63 #include <vm/vm_param.h>
   64 #include <vm/pmap.h>
   65 #include <vm/vm_map.h>
   66 
   67 #ifndef _SYS_SYSPROTO_H_
   68 struct break_args {
   69         char *nsize;
   70 };
   71 #endif
   72 int
   73 sys_break(struct thread *td, struct break_args *uap)
   74 {
   75 #if !defined(__aarch64__) && !defined(__riscv)
   76         uintptr_t addr;
   77         int error;
   78 
   79         addr = (uintptr_t)uap->nsize;
   80         error = kern_break(td, &addr);
   81         if (error == 0)
   82                 td->td_retval[0] = addr;
   83         return (error);
   84 #else /* defined(__aarch64__) || defined(__riscv) */
   85         return (ENOSYS);
   86 #endif /* defined(__aarch64__) || defined(__riscv) */
   87 }
   88 
   89 int
   90 kern_break(struct thread *td, uintptr_t *addr)
   91 {
   92         struct vmspace *vm = td->td_proc->p_vmspace;
   93         vm_map_t map = &vm->vm_map;
   94         vm_offset_t new, old, base;
   95         rlim_t datalim, lmemlim, vmemlim;
   96         int prot, rv;
   97         int error = 0;
   98 
   99         datalim = lim_cur(td, RLIMIT_DATA);
  100         lmemlim = lim_cur(td, RLIMIT_MEMLOCK);
  101         vmemlim = lim_cur(td, RLIMIT_VMEM);
  102 
  103         new = round_page(*addr);
  104         vm_map_lock(map);
  105 
  106         base = round_page((vm_offset_t) vm->vm_daddr);
  107         old = base + ctob(vm->vm_dsize);
  108         if (new > base) {
  109                 /*
  110                  * Check the resource limit, but allow a process to reduce
  111                  * its usage, even if it remains over the limit.
  112                  */
  113                 if (new - base > datalim && new > old) {
  114                         error = ENOMEM;
  115                         goto done;
  116                 }
  117                 if (new > vm_map_max(map)) {
  118                         error = ENOMEM;
  119                         goto done;
  120                 }
  121         } else if (new < base) {
  122                 /*
  123                  * Simply return the current break address without
  124                  * modifying any state.  This is an ad-hoc interface
  125                  * used by libc to determine the initial break address,
  126                  * avoiding a dependency on magic features in the system
  127                  * linker.
  128                  */
  129                 new = old;
  130                 goto done;
  131         }
  132 
  133         if (new > old) {
  134                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  135                         if (ptoa(pmap_wired_count(map->pmap)) +
  136                             (new - old) > lmemlim) {
  137                                 error = ENOMEM;
  138                                 goto done;
  139                         }
  140                 }
  141                 if (map->size + (new - old) > vmemlim) {
  142                         error = ENOMEM;
  143                         goto done;
  144                 }
  145 #ifdef RACCT
  146                 if (racct_enable) {
  147                         PROC_LOCK(td->td_proc);
  148                         error = racct_set(td->td_proc, RACCT_DATA, new - base);
  149                         if (error != 0) {
  150                                 PROC_UNLOCK(td->td_proc);
  151                                 error = ENOMEM;
  152                                 goto done;
  153                         }
  154                         error = racct_set(td->td_proc, RACCT_VMEM,
  155                             map->size + (new - old));
  156                         if (error != 0) {
  157                                 racct_set_force(td->td_proc, RACCT_DATA,
  158                                     old - base);
  159                                 PROC_UNLOCK(td->td_proc);
  160                                 error = ENOMEM;
  161                                 goto done;
  162                         }
  163                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  164                                 error = racct_set(td->td_proc, RACCT_MEMLOCK,
  165                                     ptoa(pmap_wired_count(map->pmap)) +
  166                                     (new - old));
  167                                 if (error != 0) {
  168                                         racct_set_force(td->td_proc, RACCT_DATA,
  169                                             old - base);
  170                                         racct_set_force(td->td_proc, RACCT_VMEM,
  171                                             map->size);
  172                                         PROC_UNLOCK(td->td_proc);
  173                                         error = ENOMEM;
  174                                         goto done;
  175                                 }
  176                         }
  177                         PROC_UNLOCK(td->td_proc);
  178                 }
  179 #endif
  180                 prot = VM_PROT_RW;
  181 #if (defined(COMPAT_FREEBSD32) && defined(__amd64__)) || defined(__i386__)
  182                 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
  183                         prot |= VM_PROT_EXECUTE;
  184 #endif
  185                 rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL,
  186                     0);
  187                 if (rv == KERN_SUCCESS && (map->flags & MAP_WIREFUTURE) != 0) {
  188                         rv = vm_map_wire_locked(map, old, new,
  189                             VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
  190                         if (rv != KERN_SUCCESS)
  191                                 (void)vm_map_delete(map, old, new);
  192                 }
  193                 if (rv != KERN_SUCCESS) {
  194 #ifdef RACCT
  195                         if (racct_enable) {
  196                                 PROC_LOCK(td->td_proc);
  197                                 racct_set_force(td->td_proc,
  198                                     RACCT_DATA, old - base);
  199                                 racct_set_force(td->td_proc,
  200                                     RACCT_VMEM, map->size);
  201                                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  202                                         racct_set_force(td->td_proc,
  203                                             RACCT_MEMLOCK,
  204                                             ptoa(pmap_wired_count(map->pmap)));
  205                                 }
  206                                 PROC_UNLOCK(td->td_proc);
  207                         }
  208 #endif
  209                         error = ENOMEM;
  210                         goto done;
  211                 }
  212                 vm->vm_dsize += btoc(new - old);
  213         } else if (new < old) {
  214                 rv = vm_map_delete(map, new, old);
  215                 if (rv != KERN_SUCCESS) {
  216                         error = ENOMEM;
  217                         goto done;
  218                 }
  219                 vm->vm_dsize -= btoc(old - new);
  220 #ifdef RACCT
  221                 if (racct_enable) {
  222                         PROC_LOCK(td->td_proc);
  223                         racct_set_force(td->td_proc, RACCT_DATA, new - base);
  224                         racct_set_force(td->td_proc, RACCT_VMEM, map->size);
  225                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  226                                 racct_set_force(td->td_proc, RACCT_MEMLOCK,
  227                                     ptoa(pmap_wired_count(map->pmap)));
  228                         }
  229                         PROC_UNLOCK(td->td_proc);
  230                 }
  231 #endif
  232         }
  233 done:
  234         vm_map_unlock(map);
  235 
  236         if (error == 0)
  237                 *addr = new;
  238 
  239         return (error);
  240 }
  241 
  242 #ifdef COMPAT_FREEBSD11
  243 int
  244 freebsd11_vadvise(struct thread *td, struct freebsd11_vadvise_args *uap)
  245 {
  246 
  247         return (EINVAL);
  248 }
  249 #endif
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FreeBSD/Linux Kernel Cross Reference sys/vm/vm_unix.c

FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_unix.c
