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 /* 31 * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk 32 */ 33 34 #include "zalloc_defs.h" 35 36 static MemPool MallocPool; 37 38 #ifdef DMALLOCDEBUG 39 static int MallocMax; 40 static int MallocCount; 41 42 void mallocstats(void); 43 #endif 44 45 #ifdef malloc 46 #undef malloc 47 #undef free 48 #endif 49 50 static void *Malloc_align(size_t, size_t); 51 52 #ifndef MIN 53 # define MIN(a,b) ((a) <= (b)) ? (a) : (b) 54 #endif 55 56 void * 57 Malloc(size_t bytes, const char *file __unused, int line __unused) 58 { 59 return (Malloc_align(bytes, 1)); 60 } 61 62 void * 63 Memalign(size_t alignment, size_t bytes, const char *file __unused, 64 int line __unused) 65 { 66 if (alignment == 0) 67 alignment = 1; 68 69 return (Malloc_align(bytes, alignment)); 70 } 71 72 static void * 73 Malloc_align(size_t bytes, size_t alignment) 74 { 75 Guard *res; 76 77 #ifdef USEENDGUARD 78 bytes += MALLOCALIGN + 1; 79 #else 80 bytes += MALLOCALIGN; 81 #endif 82 83 while ((res = znalloc(&MallocPool, bytes, alignment)) == NULL) { 84 int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK; 85 char *base; 86 87 if ((base = sbrk(incr)) == (char *)-1) 88 return (NULL); 89 zextendPool(&MallocPool, base, incr); 90 zfree(&MallocPool, base, incr); 91 } 92 #ifdef DMALLOCDEBUG 93 if (++MallocCount > MallocMax) 94 MallocMax = MallocCount; 95 #endif 96 #ifdef USEGUARD 97 res->ga_Magic = GAMAGIC; 98 #endif 99 res->ga_Bytes = bytes; 100 #ifdef USEENDGUARD 101 *((signed char *)res + bytes - 1) = -2; 102 #endif 103 104 return ((char *)res + MALLOCALIGN); 105 } 106 107 void 108 Free(void *ptr, const char *file, int line) 109 { 110 size_t bytes; 111 112 if (ptr != NULL) { 113 Guard *res = (void *)((char *)ptr - MALLOCALIGN); 114 115 if (file == NULL) 116 file = "unknown"; 117 #ifdef USEGUARD 118 if (res->ga_Magic == GAFREE) { 119 printf("free: duplicate free @ %p from %s:%d\n", 120 ptr, file, line); 121 return; 122 } 123 if (res->ga_Magic != GAMAGIC) { 124 size_t dump_bytes; 125 126 dump_bytes = MIN((ptr - MallocPool.mp_Base), 512); 127 hexdump(ptr - dump_bytes, dump_bytes); 128 panic("free: guard1 fail @ %p from %s:%d", 129 ptr, file, line); 130 } 131 res->ga_Magic = GAFREE; 132 #endif 133 #ifdef USEENDGUARD 134 if (*((signed char *)res + res->ga_Bytes - 1) == -1) { 135 printf("free: duplicate2 free @ %p from %s:%d\n", 136 ptr, file, line); 137 return; 138 } 139 if (*((signed char *)res + res->ga_Bytes - 1) != -2) 140 panic("free: guard2 fail @ %p + %zu from %s:%d", 141 ptr, res->ga_Bytes - MALLOCALIGN, file, line); 142 *((signed char *)res + res->ga_Bytes - 1) = -1; 143 #endif 144 145 bytes = res->ga_Bytes; 146 zfree(&MallocPool, res, bytes); 147 #ifdef DMALLOCDEBUG 148 --MallocCount; 149 #endif 150 } 151 } 152 153 154 void * 155 Calloc(size_t n1, size_t n2, const char *file, int line) 156 { 157 uintptr_t bytes = (uintptr_t)n1 * (uintptr_t)n2; 158 void *res; 159 160 if ((res = Malloc(bytes, file, line)) != NULL) { 161 bzero(res, bytes); 162 #ifdef DMALLOCDEBUG 163 if (++MallocCount > MallocMax) 164 MallocMax = MallocCount; 165 #endif 166 } 167 return (res); 168 } 169 170 /* 171 * realloc() - I could be fancier here and free the old buffer before 172 * allocating the new one (saving potential fragmentation 173 * and potential buffer copies). But I don't bother. 174 */ 175 176 void * 177 Realloc(void *ptr, size_t size, const char *file, int line) 178 { 179 void *res; 180 size_t old; 181 182 if ((res = Malloc(size, file, line)) != NULL) { 183 if (ptr != NULL) { 184 Guard *g = (Guard *)((char *)ptr - MALLOCALIGN); 185 186 old = g->ga_Bytes - MALLOCALIGN; 187 if (old < size) 188 bcopy(ptr, res, old); 189 else 190 bcopy(ptr, res, size); 191 Free(ptr, file, line); 192 } else { 193 #ifdef DMALLOCDEBUG 194 if (++MallocCount > MallocMax) 195 MallocMax = MallocCount; 196 #ifdef EXITSTATS 197 if (DidAtExit == 0) { 198 DidAtExit = 1; 199 atexit(mallocstats); 200 } 201 #endif 202 #endif 203 } 204 } 205 return (res); 206 } 207 208 void * 209 Reallocf(void *ptr, size_t size, const char *file, int line) 210 { 211 void *res; 212 213 if ((res = Realloc(ptr, size, file, line)) == NULL) 214 Free(ptr, file, line); 215 return (res); 216 } 217 218 #ifdef DMALLOCDEBUG 219 220 void 221 mallocstats(void) 222 { 223 printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); 224 #ifdef ZALLOCDEBUG 225 zallocstats(&MallocPool); 226 #endif 227 } 228 229 #endif 230