1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#if defined(__clang__)
30// clang interprets -fno-builtin more loosely than you might expect,
31// and thinks it's okay to still substitute builtins as long as they're
32// named __aeabi_* rather than __builtin_*, which causes infinite
33// recursion if we have the fortified memcpy visible in this file.
34#undef _FORTIFY_SOURCE
35#endif
36
37#include <stddef.h>
38#include <string.h>
39
40extern int __cxa_atexit(void (*)(void*), void*, void*);
41
42// All of these are weak symbols to avoid multiple definition errors when
43// linking with libstdc++-v3 or compiler-rt.
44
45/* The "C++ ABI for ARM" document states that static C++ constructors,
46 * which are called from the .init_array, should manually call
47 * __aeabi_atexit() to register static destructors explicitly.
48 *
49 * Note that 'dso_handle' is the address of a magic linker-generate
50 * variable from the shared object that contains the constructor/destructor
51 */
52
53int __attribute__((weak))
54__aeabi_atexit(void *object, void (*destructor) (void *), void *dso_handle) {
55    return __cxa_atexit(destructor, object, dso_handle);
56}
57
58
59void __attribute__((weak))
60__aeabi_memcpy8(void *dest, const void *src, size_t n) {
61    memcpy(dest, src, n);
62}
63
64void __attribute__((weak)) __aeabi_memcpy4(void *dest, const void *src, size_t n) {
65    memcpy(dest, src, n);
66}
67
68void __attribute__((weak)) __aeabi_memcpy(void *dest, const void *src, size_t n) {
69    memcpy(dest, src, n);
70}
71
72
73void __attribute__((weak)) __aeabi_memmove8(void *dest, const void *src, size_t n) {
74    memmove(dest, src, n);
75}
76
77void __attribute__((weak)) __aeabi_memmove4(void *dest, const void *src, size_t n) {
78    memmove(dest, src, n);
79}
80
81void __attribute__((weak)) __aeabi_memmove(void *dest, const void *src, size_t n) {
82    memmove(dest, src, n);
83}
84
85/*
86 * __aeabi_memset has the order of its second and third arguments reversed.
87 *  This allows __aeabi_memclr to tail-call __aeabi_memset
88 */
89
90void __attribute__((weak)) __aeabi_memset8(void *dest, size_t n, int c) {
91    memset(dest, c, n);
92}
93
94void __attribute__((weak)) __aeabi_memset4(void *dest, size_t n, int c) {
95    memset(dest, c, n);
96}
97
98void __attribute__((weak)) __aeabi_memset(void *dest, size_t n, int c) {
99    memset(dest, c, n);
100}
101
102
103void __attribute__((weak)) __aeabi_memclr8(void *dest, size_t n) {
104    __aeabi_memset8(dest, n, 0);
105}
106
107void __attribute__((weak)) __aeabi_memclr4(void *dest, size_t n) {
108    __aeabi_memset4(dest, n, 0);
109}
110
111void __attribute__((weak)) __aeabi_memclr(void *dest, size_t n) {
112    __aeabi_memset(dest, n, 0);
113}
114