uma_dbg.c revision 295451
1/*- 2 * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org> 3 * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28/* 29 * uma_dbg.c Debugging features for UMA users 30 * 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/vm/uma_dbg.c 295451 2016-02-09 20:22:35Z glebius $"); 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/bitset.h> 39#include <sys/kernel.h> 40#include <sys/types.h> 41#include <sys/queue.h> 42#include <sys/lock.h> 43#include <sys/mutex.h> 44#include <sys/malloc.h> 45 46#include <vm/vm.h> 47#include <vm/vm_object.h> 48#include <vm/vm_page.h> 49#include <vm/uma.h> 50#include <vm/uma_int.h> 51#include <vm/uma_dbg.h> 52 53static const uint32_t uma_junk = 0xdeadc0de; 54 55/* 56 * Checks an item to make sure it hasn't been overwritten since it was freed, 57 * prior to subsequent reallocation. 58 * 59 * Complies with standard ctor arg/return 60 * 61 */ 62int 63trash_ctor(void *mem, int size, void *arg, int flags) 64{ 65 int cnt; 66 uint32_t *p; 67 68 cnt = size / sizeof(uma_junk); 69 70 for (p = mem; cnt > 0; cnt--, p++) 71 if (*p != uma_junk) { 72#ifdef INVARIANTS 73 panic("Memory modified after free %p(%d) val=%x @ %p\n", 74 mem, size, *p, p); 75#else 76 printf("Memory modified after free %p(%d) val=%x @ %p\n", 77 mem, size, *p, p); 78#endif 79 return (0); 80 } 81 return (0); 82} 83 84/* 85 * Fills an item with predictable garbage 86 * 87 * Complies with standard dtor arg/return 88 * 89 */ 90void 91trash_dtor(void *mem, int size, void *arg) 92{ 93 int cnt; 94 uint32_t *p; 95 96 cnt = size / sizeof(uma_junk); 97 98 for (p = mem; cnt > 0; cnt--, p++) 99 *p = uma_junk; 100} 101 102/* 103 * Fills an item with predictable garbage 104 * 105 * Complies with standard init arg/return 106 * 107 */ 108int 109trash_init(void *mem, int size, int flags) 110{ 111 trash_dtor(mem, size, NULL); 112 return (0); 113} 114 115/* 116 * Checks an item to make sure it hasn't been overwritten since it was freed. 117 * 118 * Complies with standard fini arg/return 119 * 120 */ 121void 122trash_fini(void *mem, int size) 123{ 124 (void)trash_ctor(mem, size, NULL, 0); 125} 126 127int 128mtrash_ctor(void *mem, int size, void *arg, int flags) 129{ 130 struct malloc_type **ksp; 131 uint32_t *p = mem; 132 int cnt; 133 134 size -= sizeof(struct malloc_type *); 135 ksp = (struct malloc_type **)mem; 136 ksp += size / sizeof(struct malloc_type *); 137 cnt = size / sizeof(uma_junk); 138 139 for (p = mem; cnt > 0; cnt--, p++) 140 if (*p != uma_junk) { 141 printf("Memory modified after free %p(%d) val=%x @ %p\n", 142 mem, size, *p, p); 143 panic("Most recently used by %s\n", (*ksp == NULL)? 144 "none" : (*ksp)->ks_shortdesc); 145 } 146 return (0); 147} 148 149/* 150 * Fills an item with predictable garbage 151 * 152 * Complies with standard dtor arg/return 153 * 154 */ 155void 156mtrash_dtor(void *mem, int size, void *arg) 157{ 158 int cnt; 159 uint32_t *p; 160 161 size -= sizeof(struct malloc_type *); 162 cnt = size / sizeof(uma_junk); 163 164 for (p = mem; cnt > 0; cnt--, p++) 165 *p = uma_junk; 166} 167 168/* 169 * Fills an item with predictable garbage 170 * 171 * Complies with standard init arg/return 172 * 173 */ 174int 175mtrash_init(void *mem, int size, int flags) 176{ 177 struct malloc_type **ksp; 178 179 mtrash_dtor(mem, size, NULL); 180 181 ksp = (struct malloc_type **)mem; 182 ksp += (size / sizeof(struct malloc_type *)) - 1; 183 *ksp = NULL; 184 return (0); 185} 186 187/* 188 * Checks an item to make sure it hasn't been overwritten since it was freed, 189 * prior to freeing it back to available memory. 190 * 191 * Complies with standard fini arg/return 192 * 193 */ 194void 195mtrash_fini(void *mem, int size) 196{ 197 (void)mtrash_ctor(mem, size, NULL, 0); 198} 199