sys/vfs/procfs/procfs_map.c

   1 /*
   2  * Copyright (c) 1993 Jan-Simon Pendry
   3  * Copyright (c) 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  * Jan-Simon Pendry.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)procfs_status.c     8.3 (Berkeley) 2/17/94
  34  *
  35  * $FreeBSD: src/sys/miscfs/procfs/procfs_map.c,v 1.24.2.1 2001/08/04 13:12:24 rwatson Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/uio.h>
  41 #include <sys/proc.h>
  42 #include <sys/vnode.h>
  43 #include <sys/sbuf.h>
  44 #include <sys/malloc.h>
  45 #include <vfs/procfs/procfs.h>
  46
  47 #include <vm/vm.h>
  48 #include <sys/lock.h>
  49 #include <vm/pmap.h>
  50 #include <vm/vm_map.h>
  51 #include <vm/vm_page.h>
  52 #include <vm/vm_object.h>
  53
  54 #include <machine/limits.h>
  55
  56 int
  57 procfs_domap(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
  58              struct uio *uio)
  59 {
  60         struct proc *p = lp->lwp_proc;
  61         ssize_t buflen = uio->uio_offset + uio->uio_resid;
  62         struct vnode *vp;
  63         char *fullpath, *freepath;
  64         int error;
  65         vm_map_t map = &p->p_vmspace->vm_map;
  66         vm_map_entry_t entry;
  67         struct sbuf *sb = NULL;
  68         unsigned int last_timestamp;
  69
  70         if (uio->uio_rw != UIO_READ)
  71                 return (EOPNOTSUPP);
  72
  73         error = 0;
  74
  75         if (uio->uio_offset < 0 || uio->uio_resid < 0 || buflen >= INT_MAX)
  76                 return EINVAL;
  77         sb = sbuf_new (sb, NULL, buflen+1, 0);
  78         if (sb == NULL)
  79                 return EIO;
  80
  81         /*
  82          * Lock the map so we can access it.  Release the process token
  83          * to avoid unnecessary token stalls while we are processing the
  84          * map.
  85          */
  86         vm_map_lock_read(map);
  87         lwkt_reltoken(&p->p_token);
  88
  89         RB_FOREACH(entry, vm_map_rb_tree, &map->rb_root) {
  90                 vm_map_backing_t ba;
  91                 vm_object_t obj;
  92                 int ref_count, flags;
  93                 vm_offset_t e_start, e_end;
  94                 vm_eflags_t e_eflags;
  95                 vm_prot_t e_prot;
  96                 int resident;
  97                 char *type;
  98
  99                 switch(entry->maptype) {
 100                 case VM_MAPTYPE_NORMAL:
 101                 case VM_MAPTYPE_VPAGETABLE:
 102                         ba = &entry->ba;
 103                         break;
 104                 case VM_MAPTYPE_UKSMAP:
 105                         ba = NULL;
 106                         break;
 107                 default:
 108                         /* ignore entry */
 109                         continue;
 110                 }
 111
 112                 e_eflags = entry->eflags;
 113                 e_prot = entry->protection;
 114                 e_start = entry->ba.start;
 115                 e_end = entry->ba.end;
 116
 117                 /*
 118                  * Don't count resident pages, its impossible on 64-bit.
 119                  * A single mapping could be gigabytes or terrabytes.
 120                  */
 121                 resident = -1;
 122 #if 0
 123                 pmap_t pmap = vmspace_pmap(p->p_vmspace);
 124                 vm_offset_t addr;
 125
 126                 resident = 0;
 127                 addr = entry->ba.start;
 128                 while (addr < entry->ba.end) {
 129                         if (pmap_extract(pmap, addr, NULL))
 130                                 resident++;
 131                         addr += PAGE_SIZE;
 132                 }
 133 #endif
 134                 if (ba) {
 135                         while (ba->backing_ba)
 136                                 ba = ba->backing_ba;
 137                         obj = ba->object;
 138                         if (obj)
 139                                 vm_object_hold(obj);
 140                 } else {
 141                         obj = NULL;
 142                 }
 143                 last_timestamp = map->timestamp;
 144                 vm_map_unlock(map);
 145
 146                 freepath = NULL;
 147                 fullpath = "-";
 148                 flags = 0;
 149                 ref_count = 0;
 150
 151                 if (obj) {
 152                         switch(obj->type) {
 153                         default:
 154                         case OBJT_DEFAULT:
 155                                 type = "default";
 156                                 vp = NULL;
 157                                 break;
 158                         case OBJT_VNODE:
 159                                 type = "vnode";
 160                                 vp = obj->handle;
 161                                 vref(vp);
 162                                 break;
 163                         case OBJT_SWAP:
 164                                 type = "swap";
 165                                 vp = NULL;
 166                                 break;
 167                         case OBJT_DEVICE:
 168                                 type = "device";
 169                                 vp = NULL;
 170                                 break;
 171                         case OBJT_MGTDEVICE:
 172                                 type = "mgtdevice";
 173                                 vp = NULL;
 174                                 break;
 175                         }
 176                         if (ba->object) {
 177                                 flags = ba->object->flags;
 178                                 ref_count = ba->object->ref_count;
 179                         }
 180                         vm_object_drop(obj);
 181                         if (vp) {
 182                                 vn_fullpath(p, vp, &fullpath, &freepath, 1);
 183                                 vrele(vp);
 184                         }
 185                 } else {
 186                         switch(entry->maptype) {
 187                         case VM_MAPTYPE_UNSPECIFIED:
 188                                 type = "unspec";
 189                                 break;
 190                         case VM_MAPTYPE_NORMAL:
 191                                 type = "none";
 192                                 break;
 193                         case VM_MAPTYPE_VPAGETABLE:
 194                                 type = "vpgtbl";
 195                                 break;
 196                         case VM_MAPTYPE_SUBMAP:
 197                                 type = "submap";
 198                                 break;
 199                         case VM_MAPTYPE_UKSMAP:
 200                                 type = "uksmap";
 201                                 break;
 202                         default:
 203                                 type = "unknown";
 204                                 break;
 205                         }
 206                 }
 207
 208                 /*
 209                  * format:
 210                  *  start, end, res, priv res, cow, access, type, (fullpath).
 211                  */
 212                 error = sbuf_printf(sb,
 213 #if LONG_BIT == 64
 214                           "0x%016lx 0x%016lx %d %d %p %s%s%s %d %d "
 215 #else
 216                           "0x%08lx 0x%08lx %d %d %p %s%s%s %d %d "
 217 #endif
 218                           "0x%04x %s%s %s %s\n",
 219                         (u_long)e_start, (u_long)e_end,
 220                         resident, -1, (ba ? ba->object : NULL),
 221                         (e_prot & VM_PROT_READ) ? "r" : "-",
 222                         (e_prot & VM_PROT_WRITE) ? "w" : "-",
 223                         (e_prot & VM_PROT_EXECUTE) ? "x" : "-",
 224                         ref_count, 0, flags,
 225                         (e_eflags & MAP_ENTRY_COW) ? "COW" : "NCOW",
 226                         (e_eflags & MAP_ENTRY_NEEDS_COPY) ?" NC" : " NNC",
 227                         type, fullpath);
 228
 229                 if (freepath != NULL) {
 230                         kfree(freepath, M_TEMP);
 231                         freepath = NULL;
 232                 }
 233
 234                 vm_map_lock_read(map);
 235                 if (error == -1) {
 236                         error = 0;
 237                         break;
 238                 }
 239
 240                 if (last_timestamp != map->timestamp) {
 241                         vm_map_entry_t reentry;
 242                         vm_map_lookup_entry(map, e_start, &reentry);
 243                         entry = reentry;
 244                 }
 245         }
 246         vm_map_unlock_read(map);
 247         if (sbuf_finish(sb) == 0)
 248                 buflen = sbuf_len(sb);
 249         error = uiomove_frombuf(sbuf_data(sb), buflen, uio);
 250         sbuf_delete(sb);
 251
 252         lwkt_gettoken(&p->p_token);     /* re-acquire */
 253
 254         return error;
 255 }
 256
 257 int
 258 procfs_validmap(struct lwp *lp)
 259 {
 260         return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0);
 261 }