1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/* alloc.c
*
* Written by Erik Andersen <andersee@debian.org>
* LGPLv2
*
* Parts of the memalign code were stolen from malloc-930716.
*/
#include <features.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#ifdef L_malloc
void *malloc(size_t size)
{
void *result;
if (unlikely(size == 0)) {
#if defined(__MALLOC_GLIBC_COMPAT__)
size++;
#else
/* Some programs will call malloc (0). Lets be strict and return NULL */
return 0;
#endif
}
#ifdef __UCLIBC_HAS_MMU__
result = mmap((void *) 0, size + sizeof(size_t), PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (result == MAP_FAILED)
return 0;
* (size_t *) result = size;
return(result + sizeof(size_t));
#else
result = mmap((void *) 0, size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (result == MAP_FAILED)
return 0;
return(result);
#endif
}
#endif
#ifdef L_calloc
void * calloc(size_t nmemb, size_t lsize)
{
void *result;
size_t size=lsize * nmemb;
/* guard vs integer overflow, but allow nmemb
* to fall through and call malloc(0) */
if (nmemb && lsize != (size / nmemb)) {
__set_errno(ENOMEM);
return NULL;
}
result=malloc(size);
#if 0
/* Standard unix mmap using /dev/zero clears memory so calloc
* doesn't need to actually zero anything....
*/
if (result != NULL) {
memset(result, 0, size);
}
#endif
return result;
}
#endif
#ifdef L_realloc
void *realloc(void *ptr, size_t size)
{
void *newptr = NULL;
if (!ptr)
return malloc(size);
if (!size) {
free(ptr);
return malloc(0);
}
newptr = malloc(size);
if (newptr) {
memcpy(newptr, ptr,
#ifdef __UCLIBC_HAS_MMU__
*((size_t *) (ptr - sizeof(size_t)))
#else
size
#endif
);
free(ptr);
}
return newptr;
}
#endif
#ifdef L_free
extern int weak_function __libc_free_aligned(void *ptr);
void free(void *ptr)
{
if (ptr == NULL)
return;
if (unlikely(__libc_free_aligned!=NULL)) {
if (__libc_free_aligned(ptr)) {
return;
}
}
#ifdef __UCLIBC_HAS_MMU__
ptr -= sizeof(size_t);
munmap(ptr, * (size_t *) ptr + sizeof(size_t));
#else
munmap(ptr, 0);
#endif
}
#endif
#ifdef L_memalign
#ifdef __UCLIBC_HAS_THREADS__
#include <pthread.h>
extern pthread_mutex_t __malloclock;
# define LOCK __pthread_mutex_lock(&__malloclock)
# define UNLOCK __pthread_mutex_unlock(&__malloclock);
#else
# define LOCK
# define UNLOCK
#endif
/* List of blocks allocated with memalign or valloc */
struct alignlist
{
struct alignlist *next;
__ptr_t aligned; /* The address that memaligned returned. */
__ptr_t exact; /* The address that malloc returned. */
};
struct alignlist *_aligned_blocks;
/* Return memory to the heap. */
int __libc_free_aligned(void *ptr)
{
struct alignlist *l;
if (ptr == NULL)
return 0;
LOCK;
for (l = _aligned_blocks; l != NULL; l = l->next) {
if (l->aligned == ptr) {
/* Mark the block as free */
l->aligned = NULL;
ptr = l->exact;
#ifdef __UCLIBC_HAS_MMU__
ptr -= sizeof(size_t);
munmap(ptr, * (size_t *) ptr + sizeof(size_t));
#else
munmap(ptr, 0);
#endif
return 1;
}
}
UNLOCK;
return 0;
}
void * memalign (size_t alignment, size_t size)
{
void * result;
unsigned long int adj;
result = malloc (size + alignment - 1);
if (result == NULL)
return NULL;
adj = (unsigned long int) ((unsigned long int) ((char *) result -
(char *) NULL)) % alignment;
if (adj != 0)
{
struct alignlist *l;
LOCK;
for (l = _aligned_blocks; l != NULL; l = l->next)
if (l->aligned == NULL)
/* This slot is free. Use it. */
break;
if (l == NULL)
{
l = (struct alignlist *) malloc (sizeof (struct alignlist));
if (l == NULL) {
free(result);
UNLOCK;
return NULL;
}
l->next = _aligned_blocks;
_aligned_blocks = l;
}
l->exact = result;
result = l->aligned = (char *) result + alignment - adj;
UNLOCK;
}
return result;
}
#endif
|
