uma_dbg.c

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    1 /*
    2  * Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/vm/uma_dbg.c 106773 2002-11-11 11:50:03Z mjacob $
   27  *
   28  */
   29 
   30 /*
   31  * uma_dbg.c    Debugging features for UMA users
   32  *
   33  */
   34 
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 #include <sys/types.h>
   40 #include <sys/queue.h>
   41 #include <sys/lock.h>
   42 #include <sys/mutex.h>
   43 #include <sys/malloc.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/vm_object.h>
   47 #include <vm/vm_page.h>
   48 #include <vm/uma.h>
   49 #include <vm/uma_int.h>
   50 #include <vm/uma_dbg.h>
   51 
   52 static const u_int32_t uma_junk = 0xdeadc0de;
   53 
   54 /*
   55  * Checks an item to make sure it hasn't been overwritten since freed.
   56  *
   57  * Complies with standard ctor arg/return
   58  *
   59  */
   60 void
   61 trash_ctor(void *mem, int size, void *arg)
   62 {
   63         int cnt;
   64         u_int32_t *p;
   65 
   66         cnt = size / sizeof(uma_junk);
   67 
   68         for (p = mem; cnt > 0; cnt--, p++)
   69                 if (*p != uma_junk)
   70                         panic("Memory modified after free %p(%d)\n",
   71                             mem, size);
   72 }
   73 
   74 /*
   75  * Fills an item with predictable garbage
   76  *
   77  * Complies with standard dtor arg/return
   78  *
   79  */
   80 void
   81 trash_dtor(void *mem, int size, void *arg)
   82 {
   83         int cnt;
   84         u_int32_t *p;
   85 
   86         cnt = size / sizeof(uma_junk);
   87 
   88         for (p = mem; cnt > 0; cnt--, p++)
   89                 *p = uma_junk;
   90 }
   91 
   92 /*
   93  * Fills an item with predictable garbage
   94  *
   95  * Complies with standard init arg/return
   96  *
   97  */
   98 void
   99 trash_init(void *mem, int size)
  100 {
  101         trash_dtor(mem, size, NULL);
  102 }
  103 
  104 /*
  105  * Checks an item to make sure it hasn't been overwritten since it was freed.
  106  *
  107  * Complies with standard fini arg/return
  108  *
  109  */
  110 void
  111 trash_fini(void *mem, int size)
  112 {
  113         trash_ctor(mem, size, NULL);
  114 }
  115 
  116 /*
  117  * Checks an item to make sure it hasn't been overwritten since freed.
  118  *
  119  * Complies with standard ctor arg/return
  120  *
  121  */
  122 void
  123 mtrash_ctor(void *mem, int size, void *arg)
  124 {
  125         struct malloc_type **ksp;
  126         u_int32_t *p = mem;
  127         int cnt;
  128 
  129         size -= sizeof(struct malloc_type *);
  130         ksp = (struct malloc_type **)mem;
  131         ksp += size / sizeof(struct malloc_type *);
  132         cnt = size / sizeof(uma_junk);
  133 
  134         for (p = mem; cnt > 0; cnt--, p++)
  135                 if (*p != uma_junk) {
  136                         printf("Memory modified after free %p(%d)\n",
  137                             mem, size);
  138                         panic("Most recently used by %s\n", (*ksp == NULL)?
  139                             "none" : (*ksp)->ks_shortdesc);
  140                 }
  141 }
  142 
  143 /*
  144  * Fills an item with predictable garbage
  145  *
  146  * Complies with standard dtor arg/return
  147  *
  148  */
  149 void
  150 mtrash_dtor(void *mem, int size, void *arg)
  151 {
  152         int cnt;
  153         u_int32_t *p;
  154 
  155         size -= sizeof(struct malloc_type *);
  156         cnt = size / sizeof(uma_junk);
  157 
  158         for (p = mem; cnt > 0; cnt--, p++)
  159                 *p = uma_junk;
  160 }
  161 
  162 /*
  163  * Fills an item with predictable garbage
  164  *
  165  * Complies with standard init arg/return
  166  *
  167  */
  168 void
  169 mtrash_init(void *mem, int size)
  170 {
  171         struct malloc_type **ksp;
  172 
  173         mtrash_dtor(mem, size, NULL);
  174 
  175         ksp = (struct malloc_type **)mem;
  176         ksp += (size / sizeof(struct malloc_type *)) - 1;
  177         *ksp = NULL;
  178 }
  179 
  180 /*
  181  * Checks an item to make sure it hasn't been overwritten since it was freed.
  182  *
  183  * Complies with standard fini arg/return
  184  *
  185  */
  186 void
  187 mtrash_fini(void *mem, int size)
  188 {
  189         mtrash_ctor(mem, size, NULL);
  190 }
  191 
  192 static uma_slab_t
  193 uma_dbg_getslab(uma_zone_t zone, void *item)
  194 {
  195         uma_slab_t slab;
  196         u_int8_t *mem;
  197 
  198         mem = (u_int8_t *)((unsigned long)item & (~UMA_SLAB_MASK));
  199         if (zone->uz_flags & UMA_ZFLAG_MALLOC) {
  200                 slab = vtoslab((vm_offset_t)mem);
  201         } else if (zone->uz_flags & UMA_ZFLAG_HASH) {
  202                 slab = hash_sfind(&zone->uz_hash, mem);
  203         } else {
  204                 mem += zone->uz_pgoff;
  205                 slab = (uma_slab_t)mem;
  206         }
  207 
  208         return (slab);
  209 }
  210 
  211 /*
  212  * Set up the slab's freei data such that uma_dbg_free can function.
  213  *
  214  */
  215 
  216 void
  217 uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item)
  218 {
  219         int freei;
  220 
  221         if (slab == NULL) {
  222                 slab = uma_dbg_getslab(zone, item);
  223                 if (slab == NULL) 
  224                         panic("uma: item %p did not belong to zone %s\n",
  225                             item, zone->uz_name);
  226         }
  227 
  228         freei = ((unsigned long)item - (unsigned long)slab->us_data)
  229             / zone->uz_rsize;
  230 
  231         slab->us_freelist[freei] = 255;
  232 
  233         return;
  234 }
  235 
  236 /*
  237  * Verifies freed addresses.  Checks for alignment, valid slab membership
  238  * and duplicate frees.
  239  *
  240  */
  241 
  242 void
  243 uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item)
  244 {
  245         int freei;
  246 
  247         if (slab == NULL) {
  248                 slab = uma_dbg_getslab(zone, item);
  249                 if (slab == NULL) 
  250                         panic("uma: Freed item %p did not belong to zone %s\n",
  251                             item, zone->uz_name);
  252         }
  253 
  254         freei = ((unsigned long)item - (unsigned long)slab->us_data)
  255             / zone->uz_rsize;
  256 
  257         if (freei >= zone->uz_ipers)
  258                 panic("zone: %s(%p) slab %p freelist %d out of range 0-%d\n",
  259                     zone->uz_name, zone, slab, freei, zone->uz_ipers-1);
  260 
  261         if (((freei * zone->uz_rsize) + slab->us_data) != item) {
  262                 printf("zone: %s(%p) slab %p freed address %p unaligned.\n",
  263                     zone->uz_name, zone, slab, item);
  264                 panic("should be %p\n",
  265                     (freei * zone->uz_rsize) + slab->us_data);
  266         }
  267 
  268         if (slab->us_freelist[freei] != 255) {
  269                 printf("Slab at %p, freei %d = %d.\n",
  270                     slab, freei, slab->us_freelist[freei]);
  271                 panic("Duplicate free of item %p from zone %p(%s)\n",
  272                     item, zone, zone->uz_name);
  273         }
  274 
  275         /*
  276          * When this is actually linked into the slab this will change.
  277          * Until then the count of valid slabs will make sure we don't
  278          * accidentally follow this and assume it's a valid index.
  279          */
  280         slab->us_freelist[freei] = 0;
  281 }

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

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sys/vm/uma_dbg.c