sysdeps/arm/armv7/multiarch/memcpy.S

   1 /* Multiple versions of memcpy
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2013-2015 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* Thumb requires excess IT instructions here.  */
  21 #define NO_THUMB
  22 #include <sysdep.h>
  23 #include <rtld-global-offsets.h>
  24
  25 #if IS_IN (libc)
  26 /* Under __ARM_NEON__, memcpy_neon.S defines the name memcpy.  */
  27 # ifndef __ARM_NEON__
  28         .text
  29 ENTRY(memcpy)
  30         .type   memcpy, %gnu_indirect_function
  31 # ifdef __SOFTFP__
  32         ldr     r1, .Lmemcpy_arm
  33         tst     r0, #HWCAP_ARM_VFP
  34         ldrne   r1, .Lmemcpy_vfp
  35 # else
  36         ldr     r1, .Lmemcpy_vfp
  37 # endif
  38         tst     r0, #HWCAP_ARM_NEON
  39         ldrne   r1, .Lmemcpy_neon
  40 1:
  41         add     r0, r1, pc
  42         DO_RET(lr)
  43
  44 # ifdef __SOFTFP__
  45 .Lmemcpy_arm:
  46         .long   C_SYMBOL_NAME(__memcpy_arm) - 1b - PC_OFS
  47 # endif
  48 .Lmemcpy_neon:
  49         .long   C_SYMBOL_NAME(__memcpy_neon) - 1b - PC_OFS
  50 .Lmemcpy_vfp:
  51         .long   C_SYMBOL_NAME(__memcpy_vfp) - 1b - PC_OFS
  52
  53 END(memcpy)
  54
  55 libc_hidden_builtin_def (memcpy)
  56 #endif  /* Not __ARM_NEON__.  */
  57
  58 /* These versions of memcpy are defined not to clobber any VFP or NEON
  59    registers so they must always call the ARM variant of the memcpy code.  */
  60 strong_alias (__memcpy_arm, __aeabi_memcpy)
  61 strong_alias (__memcpy_arm, __aeabi_memcpy4)
  62 strong_alias (__memcpy_arm, __aeabi_memcpy8)
  63 libc_hidden_def (__memcpy_arm)
  64
  65 #undef libc_hidden_builtin_def
  66 #define libc_hidden_builtin_def(name)
  67 #undef weak_alias
  68 #define weak_alias(x, y)
  69 #undef libc_hidden_def
  70 #define libc_hidden_def(name)
  71
  72 #define memcpy __memcpy_arm
  73
  74 #endif
  75
  76 #include "memcpy_impl.S"