newlib/libc/machine/arm/aeabi_memcpy.c

   1 /*
   2  * Copyright (c) 2014 ARM Ltd
   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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the company may not be used to endorse or promote
  14  *    products derived from this software without specific prior written
  15  *    permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  22  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  24  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  25  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <stddef.h>
  30 #include <_ansi.h>
  31
  32 /* According to the Run-time ABI for the ARM Architecture.  This
  33    function is allowed to corrupt only the integer core register
  34    permitted to be corrupted by the [AAPCS] (r0-r3, ip, lr, and
  35    CPSR).
  36
  37    The FP registers are used in memcpy for target __ARM_ARCH_7A.
  38    Therefore, we can't just simply use alias to support the function
  39    aeabi_memcpy for target __ARM_ARCH_7A.  Instead, we choose the
  40    previous versions of memcpy to suppport it as an alternative.  */
  41
  42 /* NOTE: This ifdef MUST match the one in aeabi_memcpy-armv7a.S.  */
  43 #if defined (__ARM_ARCH_7A__) && defined (__ARM_FEATURE_UNALIGNED) && \
  44         (defined (__ARM_NEON__) || !defined (__SOFTFP__))
  45
  46 /* Defined in aeabi_memcpy-armv7a.S.  */
  47
  48 #else
  49 /* Support the alias for the __aeabi_memcpy which may
  50    assume memory alignment.  */
  51 void __aeabi_memcpy4 (void *dest, const void *source, size_t n)
  52         _ATTRIBUTE ((alias ("__aeabi_memcpy")));
  53
  54 void __aeabi_memcpy8 (void *dest, const void *source, size_t n)
  55         _ATTRIBUTE ((alias ("__aeabi_memcpy")));
  56
  57 /* Support the routine __aeabi_memcpy.  Can't alias to memcpy
  58    because it's not defined in the same translation unit.  */
  59 void __aeabi_memcpy (void *dest, const void *source, size_t n)
  60 {
  61   extern void memcpy (void *dest, const void *source, size_t n);
  62   memcpy (dest, source, n);
  63 }
  64 #endif