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 40 extern 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 53 int __attribute__((weak)) 54 __aeabi_atexit(void *object, void (*destructor) (void *), void *dso_handle) { 55 return __cxa_atexit(destructor, object, dso_handle); 56 } 57 58 59 void __attribute__((weak)) 60 __aeabi_memcpy8(void *dest, const void *src, size_t n) { 61 memcpy(dest, src, n); 62 } 63 64 void __attribute__((weak)) __aeabi_memcpy4(void *dest, const void *src, size_t n) { 65 memcpy(dest, src, n); 66 } 67 68 void __attribute__((weak)) __aeabi_memcpy(void *dest, const void *src, size_t n) { 69 memcpy(dest, src, n); 70 } 71 72 73 void __attribute__((weak)) __aeabi_memmove8(void *dest, const void *src, size_t n) { 74 memmove(dest, src, n); 75 } 76 77 void __attribute__((weak)) __aeabi_memmove4(void *dest, const void *src, size_t n) { 78 memmove(dest, src, n); 79 } 80 81 void __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 90 void __attribute__((weak)) __aeabi_memset8(void *dest, size_t n, int c) { 91 memset(dest, c, n); 92 } 93 94 void __attribute__((weak)) __aeabi_memset4(void *dest, size_t n, int c) { 95 memset(dest, c, n); 96 } 97 98 void __attribute__((weak)) __aeabi_memset(void *dest, size_t n, int c) { 99 memset(dest, c, n); 100 } 101 102 103 void __attribute__((weak)) __aeabi_memclr8(void *dest, size_t n) { 104 __aeabi_memset8(dest, n, 0); 105 } 106 107 void __attribute__((weak)) __aeabi_memclr4(void *dest, size_t n) { 108 __aeabi_memset4(dest, n, 0); 109 } 110 111 void __attribute__((weak)) __aeabi_memclr(void *dest, size_t n) { 112 __aeabi_memset(dest, n, 0); 113 } 114
