3 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
5 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
8 * Parts of the memalign code were stolen from malloc-930716.
22 void *malloc(size_t size)
26 if (unlikely(size == 0)) {
27 #if defined(__MALLOC_GLIBC_COMPAT__)
30 /* Some programs will call malloc (0). Lets be strict and return NULL */
36 #ifdef __ARCH_USE_MMU__
37 # define MMAP_FLAGS MAP_PRIVATE | MAP_ANONYMOUS
39 # define MMAP_FLAGS MAP_SHARED | MAP_ANONYMOUS | MAP_UNINITIALIZE
42 result = mmap((void *) 0, size + sizeof(size_t), PROT_READ | PROT_WRITE,
44 if (result == MAP_FAILED)
46 * (size_t *) result = size;
47 return(result + sizeof(size_t));
52 void * calloc(size_t nmemb, size_t lsize)
55 size_t size=lsize * nmemb;
57 /* guard vs integer overflow, but allow nmemb
58 * to fall through and call malloc(0) */
59 if (nmemb && lsize != (size / nmemb)) {
63 result = malloc(size);
65 #ifndef __ARCH_USE_MMU__
66 /* mmap'd with MAP_UNINITIALIZE, we have to blank memory ourselves */
68 memset(result, 0, size);
76 void *realloc(void *ptr, size_t size)
87 newptr = malloc(size);
89 size_t old_size = *((size_t *) (ptr - sizeof(size_t)));
90 memcpy(newptr, ptr, (old_size < size ? old_size : size));
98 extern int weak_function __libc_free_aligned(void *ptr);
101 if (unlikely(ptr == NULL))
103 if (unlikely(__libc_free_aligned != NULL)) {
104 if (__libc_free_aligned(ptr))
107 ptr -= sizeof(size_t);
108 munmap(ptr, * (size_t *) ptr + sizeof(size_t));
114 #include <bits/uClibc_mutex.h>
115 __UCLIBC_MUTEX_INIT(__malloc_lock, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP);
116 #define __MALLOC_LOCK __UCLIBC_MUTEX_LOCK(__malloc_lock)
117 #define __MALLOC_UNLOCK __UCLIBC_MUTEX_UNLOCK(__malloc_lock)
119 /* List of blocks allocated with memalign or valloc */
122 struct alignlist *next;
123 __ptr_t aligned; /* The address that memaligned returned. */
124 __ptr_t exact; /* The address that malloc returned. */
126 struct alignlist *_aligned_blocks;
128 /* Return memory to the heap. */
129 int __libc_free_aligned(void *ptr)
137 for (l = _aligned_blocks; l != NULL; l = l->next) {
138 if (l->aligned == ptr) {
139 /* Mark the block as free */
142 ptr -= sizeof(size_t);
143 munmap(ptr, * (size_t *) ptr + sizeof(size_t));
150 void * memalign (size_t alignment, size_t size)
153 unsigned long int adj;
155 result = malloc (size + alignment - 1);
159 adj = (unsigned long int) ((unsigned long int) ((char *) result - (char *) NULL)) % alignment;
163 for (l = _aligned_blocks; l != NULL; l = l->next)
164 if (l->aligned == NULL)
165 /* This slot is free. Use it. */
168 l = (struct alignlist *) malloc (sizeof (struct alignlist));
174 l->next = _aligned_blocks;
178 result = l->aligned = (char *) result + alignment - adj;