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_impl(void *object, void (*destructor) (void *), void *dso_handle) {
55    return __cxa_atexit(destructor, object, dso_handle);
56}
57
58int __attribute__((weak))
59__aeabi_atexit_impl2(void *object, void (*destructor) (void *), void *dso_handle) {
60    return __cxa_atexit(destructor, object, dso_handle);
61}
62
63
64void __attribute__((weak)) __aeabi_memcpy8_impl(void *dest, const void *src, size_t n) {
65    memcpy(dest, src, n);
66}
67
68void __attribute__((weak)) __aeabi_memcpy4_impl(void *dest, const void *src, size_t n) {
69    memcpy(dest, src, n);
70}
71
72void __attribute__((weak)) __aeabi_memcpy_impl(void *dest, const void *src, size_t n) {
73    memcpy(dest, src, n);
74}
75
76void __attribute__((weak)) __aeabi_memcpy8_impl2(void *dest, const void *src, size_t n) {
77    memcpy(dest, src, n);
78}
79
80void __attribute__((weak)) __aeabi_memcpy4_impl2(void *dest, const void *src, size_t n) {
81    memcpy(dest, src, n);
82}
83
84void __attribute__((weak)) __aeabi_memcpy_impl2(void *dest, const void *src, size_t n) {
85    memcpy(dest, src, n);
86}
87
88
89void __attribute__((weak)) __aeabi_memmove8_impl(void *dest, const void *src, size_t n) {
90    memmove(dest, src, n);
91}
92
93void __attribute__((weak)) __aeabi_memmove4_impl(void *dest, const void *src, size_t n) {
94    memmove(dest, src, n);
95}
96
97void __attribute__((weak)) __aeabi_memmove_impl(void *dest, const void *src, size_t n) {
98    memmove(dest, src, n);
99}
100
101void __attribute__((weak)) __aeabi_memmove8_impl2(void *dest, const void *src, size_t n) {
102    memmove(dest, src, n);
103}
104
105void __attribute__((weak)) __aeabi_memmove4_impl2(void *dest, const void *src, size_t n) {
106    memmove(dest, src, n);
107}
108
109void __attribute__((weak)) __aeabi_memmove_impl2(void *dest, const void *src, size_t n) {
110    memmove(dest, src, n);
111}
112
113/*
114 * __aeabi_memset has the order of its second and third arguments reversed.
115 *  This allows __aeabi_memclr to tail-call __aeabi_memset
116 */
117
118void __attribute__((weak)) __aeabi_memset8_impl(void *dest, size_t n, int c) {
119    memset(dest, c, n);
120}
121
122void __attribute__((weak)) __aeabi_memset4_impl(void *dest, size_t n, int c) {
123    memset(dest, c, n);
124}
125
126void __attribute__((weak)) __aeabi_memset_impl(void *dest, size_t n, int c) {
127    memset(dest, c, n);
128}
129
130void __attribute__((weak)) __aeabi_memset8_impl2(void *dest, size_t n, int c) {
131    memset(dest, c, n);
132}
133
134void __attribute__((weak)) __aeabi_memset4_impl2(void *dest, size_t n, int c) {
135    memset(dest, c, n);
136}
137
138void __attribute__((weak)) __aeabi_memset_impl2(void *dest, size_t n, int c) {
139    memset(dest, c, n);
140}
141
142
143void __attribute__((weak)) __aeabi_memclr8_impl(void *dest, size_t n) {
144    __aeabi_memset8_impl(dest, n, 0);
145}
146
147void __attribute__((weak)) __aeabi_memclr4_impl(void *dest, size_t n) {
148    __aeabi_memset4_impl(dest, n, 0);
149}
150
151void __attribute__((weak)) __aeabi_memclr_impl(void *dest, size_t n) {
152    __aeabi_memset_impl(dest, n, 0);
153}
154
155void __attribute__((weak)) __aeabi_memclr8_impl2(void *dest, size_t n) {
156    __aeabi_memset8_impl(dest, n, 0);
157}
158
159void __attribute__((weak)) __aeabi_memclr4_impl2(void *dest, size_t n) {
160    __aeabi_memset4_impl(dest, n, 0);
161}
162
163void __attribute__((weak)) __aeabi_memclr_impl2(void *dest, size_t n) {
164    __aeabi_memset_impl(dest, n, 0);
165}
166
167#define __AEABI_SYMVERS(fn_name) \
168__asm__(".symver " #fn_name "_impl, " #fn_name "@@LIBC_N"); \
169__asm__(".symver " #fn_name "_impl2, " #fn_name "@LIBC_PRIVATE")
170
171__AEABI_SYMVERS(__aeabi_atexit);
172__AEABI_SYMVERS(__aeabi_memcpy8);
173__AEABI_SYMVERS(__aeabi_memcpy4);
174__AEABI_SYMVERS(__aeabi_memcpy);
175__AEABI_SYMVERS(__aeabi_memmove8);
176__AEABI_SYMVERS(__aeabi_memmove4);
177__AEABI_SYMVERS(__aeabi_memmove);
178__AEABI_SYMVERS(__aeabi_memset8);
179__AEABI_SYMVERS(__aeabi_memset4);
180__AEABI_SYMVERS(__aeabi_memset);
181__AEABI_SYMVERS(__aeabi_memclr8);
182__AEABI_SYMVERS(__aeabi_memclr4);
183__AEABI_SYMVERS(__aeabi_memclr);
184
185#undef __AEABI_SYMVERS
186