blob: e4c85d96d3a251414030b1f3bc9123e76e38e4f9 [file] [log] [blame]
/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(__clang__)
// clang interprets -fno-builtin more loosely than you might expect,
// and thinks it's okay to still substitute builtins as long as they're
// named __aeabi_* rather than __builtin_*, which causes infinite
// recursion if we have the fortified memcpy visible in this file.
#undef _FORTIFY_SOURCE
#endif
#include <stddef.h>
#include <string.h>
extern int __cxa_atexit(void (*)(void*), void*, void*);
// All of these are weak symbols to avoid multiple definition errors when
// linking with libstdc++-v3 or compiler-rt.
/* The "C++ ABI for ARM" document states that static C++ constructors,
* which are called from the .init_array, should manually call
* __aeabi_atexit() to register static destructors explicitly.
*
* Note that 'dso_handle' is the address of a magic linker-generate
* variable from the shared object that contains the constructor/destructor
*/
int __attribute__((weak))
__aeabi_atexit_impl(void *object, void (*destructor) (void *), void *dso_handle) {
return __cxa_atexit(destructor, object, dso_handle);
}
void __attribute__((weak))
__aeabi_memcpy8_impl(void *dest, const void *src, size_t n) {
memcpy(dest, src, n);
}
void __attribute__((weak)) __aeabi_memcpy4_impl(void *dest, const void *src, size_t n) {
memcpy(dest, src, n);
}
void __attribute__((weak)) __aeabi_memcpy_impl(void *dest, const void *src, size_t n) {
memcpy(dest, src, n);
}
void __attribute__((weak)) __aeabi_memmove8_impl(void *dest, const void *src, size_t n) {
memmove(dest, src, n);
}
void __attribute__((weak)) __aeabi_memmove4_impl(void *dest, const void *src, size_t n) {
memmove(dest, src, n);
}
void __attribute__((weak)) __aeabi_memmove_impl(void *dest, const void *src, size_t n) {
memmove(dest, src, n);
}
/*
* __aeabi_memset has the order of its second and third arguments reversed.
* This allows __aeabi_memclr to tail-call __aeabi_memset
*/
void __attribute__((weak)) __aeabi_memset8_impl(void *dest, size_t n, int c) {
memset(dest, c, n);
}
void __attribute__((weak)) __aeabi_memset4_impl(void *dest, size_t n, int c) {
memset(dest, c, n);
}
void __attribute__((weak)) __aeabi_memset_impl(void *dest, size_t n, int c) {
memset(dest, c, n);
}
void __attribute__((weak)) __aeabi_memclr8_impl(void *dest, size_t n) {
__aeabi_memset8_impl(dest, n, 0);
}
void __attribute__((weak)) __aeabi_memclr4_impl(void *dest, size_t n) {
__aeabi_memset4_impl(dest, n, 0);
}
void __attribute__((weak)) __aeabi_memclr_impl(void *dest, size_t n) {
__aeabi_memset_impl(dest, n, 0);
}
#define __AEABI_SYMVERS(fn_name) \
__asm__(".symver " #fn_name "_impl, " #fn_name "@@LIBC"); \
__asm__(".symver " #fn_name "_impl, " #fn_name "@LIBC_PRIVATE")
__AEABI_SYMVERS(__aeabi_atexit);
__AEABI_SYMVERS(__aeabi_memcpy8);
__AEABI_SYMVERS(__aeabi_memcpy4);
__AEABI_SYMVERS(__aeabi_memcpy);
__AEABI_SYMVERS(__aeabi_memmove8);
__AEABI_SYMVERS(__aeabi_memmove4);
__AEABI_SYMVERS(__aeabi_memmove);
__AEABI_SYMVERS(__aeabi_memset8);
__AEABI_SYMVERS(__aeabi_memset4);
__AEABI_SYMVERS(__aeabi_memset);
__AEABI_SYMVERS(__aeabi_memclr8);
__AEABI_SYMVERS(__aeabi_memclr4);
__AEABI_SYMVERS(__aeabi_memclr);
#undef __AEABI_SYMVERS