1 /* 2 * This module derived from code donated to the FreeBSD Project by 3 * Matthew Dillon <dillon@backplane.com> 4 * 5 * Copyright (c) 1998 The FreeBSD Project 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 /* 34 * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk 35 */ 36 37 #include "zalloc_defs.h" 38 39 static MemPool MallocPool; 40 41 #ifdef DMALLOCDEBUG 42 static int MallocMax; 43 static int MallocCount; 44 45 void mallocstats(void); 46 #endif 47 48 #ifdef malloc 49 #undef malloc 50 #undef free 51 #endif 52 53 void * 54 Malloc(size_t bytes, const char *file, int line) 55 { 56 Guard *res; 57 58 #ifdef USEENDGUARD 59 bytes += MALLOCALIGN + 1; 60 #else 61 bytes += MALLOCALIGN; 62 #endif 63 64 while ((res = znalloc(&MallocPool, bytes)) == NULL) { 65 int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK; 66 char *base; 67 68 if ((base = sbrk(incr)) == (char *)-1) 69 return(NULL); 70 zextendPool(&MallocPool, base, incr); 71 zfree(&MallocPool, base, incr); 72 } 73 #ifdef DMALLOCDEBUG 74 if (++MallocCount > MallocMax) 75 MallocMax = MallocCount; 76 #endif 77 #ifdef USEGUARD 78 res->ga_Magic = GAMAGIC; 79 #endif 80 res->ga_Bytes = bytes; 81 #ifdef USEENDGUARD 82 *((signed char *)res + bytes - 1) = -2; 83 #endif 84 85 return((char *)res + MALLOCALIGN); 86 } 87 88 void 89 Free(void *ptr, const char *file, int line) 90 { 91 size_t bytes; 92 93 if (ptr != NULL) { 94 Guard *res = (void *)((char *)ptr - MALLOCALIGN); 95 96 if (file == NULL) 97 file = "unknown"; 98 #ifdef USEGUARD 99 if (res->ga_Magic == GAFREE) { 100 printf("free: duplicate free @ %p from %s:%d\n", ptr, file, line); 101 return; 102 } 103 if (res->ga_Magic != GAMAGIC) 104 panic("free: guard1 fail @ %p from %s:%d", ptr, file, line); 105 res->ga_Magic = GAFREE; 106 #endif 107 #ifdef USEENDGUARD 108 if (*((signed char *)res + res->ga_Bytes - 1) == -1) { 109 printf("free: duplicate2 free @ %p from %s:%d\n", ptr, file, line); 110 return; 111 } 112 if (*((signed char *)res + res->ga_Bytes - 1) != -2) 113 panic("free: guard2 fail @ %p + %zu from %s:%d", ptr, res->ga_Bytes - MALLOCALIGN, file, line); 114 *((signed char *)res + res->ga_Bytes - 1) = -1; 115 #endif 116 117 bytes = res->ga_Bytes; 118 zfree(&MallocPool, res, bytes); 119 #ifdef DMALLOCDEBUG 120 --MallocCount; 121 #endif 122 } 123 } 124 125 126 void * 127 Calloc(size_t n1, size_t n2, const char *file, int line) 128 { 129 uintptr_t bytes = (uintptr_t)n1 * (uintptr_t)n2; 130 void *res; 131 132 if ((res = Malloc(bytes, file, line)) != NULL) { 133 bzero(res, bytes); 134 #ifdef DMALLOCDEBUG 135 if (++MallocCount > MallocMax) 136 MallocMax = MallocCount; 137 #endif 138 } 139 return(res); 140 } 141 142 /* 143 * realloc() - I could be fancier here and free the old buffer before 144 * allocating the new one (saving potential fragmentation 145 * and potential buffer copies). But I don't bother. 146 */ 147 148 void * 149 Realloc(void *ptr, size_t size, const char *file, int line) 150 { 151 void *res; 152 size_t old; 153 154 if ((res = Malloc(size, file, line)) != NULL) { 155 if (ptr) { 156 old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN; 157 if (old < size) 158 bcopy(ptr, res, old); 159 else 160 bcopy(ptr, res, size); 161 Free(ptr, file, line); 162 } else { 163 #ifdef DMALLOCDEBUG 164 if (++MallocCount > MallocMax) 165 MallocMax = MallocCount; 166 #ifdef EXITSTATS 167 if (DidAtExit == 0) { 168 DidAtExit = 1; 169 atexit(mallocstats); 170 } 171 #endif 172 #endif 173 } 174 } 175 return(res); 176 } 177 178 void * 179 Reallocf(void *ptr, size_t size, const char *file, int line) 180 { 181 void *res; 182 183 if ((res = Realloc(ptr, size, file, line)) == NULL) 184 Free(ptr, file, line); 185 return(res); 186 } 187 188 #ifdef DMALLOCDEBUG 189 190 void 191 mallocstats(void) 192 { 193 printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); 194 #ifdef ZALLOCDEBUG 195 zallocstats(&MallocPool); 196 #endif 197 } 198 199 #endif 200 201