sysdeps/s390/memmove.c

   1 /* Multiple versions of memmove.
   2    Copyright (C) 2016-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <ifunc-memcpy.h>
  20
  21 #if HAVE_MEMMOVE_IFUNC
  22 /* If we don't use ifunc, an alias is defined for memmove
  23    in sysdeps/s390/memmove-c.c or sysdeps/s390/memcpy.S
  24    depending on the used default implementation.  */
  25 # undef memmove
  26 # define memmove __redirect_memmove
  27 # include <string.h>
  28 # include <ifunc-resolve.h>
  29 # undef memmove
  30
  31 # if HAVE_MEMMOVE_C
  32 extern __typeof (__redirect_memmove) MEMMOVE_C attribute_hidden;
  33 # endif
  34
  35 # if HAVE_MEMMOVE_Z13
  36 extern __typeof (__redirect_memmove) MEMMOVE_Z13 attribute_hidden;
  37 # endif
  38
  39 # if HAVE_MEMMOVE_ARCH13
  40 extern __typeof (__redirect_memmove) MEMMOVE_ARCH13 attribute_hidden;
  41 # endif
  42
  43 s390_libc_ifunc_expr (__redirect_memmove, memmove,
  44                       ({
  45                         s390_libc_ifunc_expr_stfle_init ();
  46                         (HAVE_MEMMOVE_ARCH13 && (hwcap & HWCAP_S390_VXRS_EXT2)
  47                          && S390_IS_ARCH13_MIE3 (stfle_bits))
  48                           ? MEMMOVE_ARCH13
  49                           : (HAVE_MEMMOVE_Z13 && (hwcap & HWCAP_S390_VX))
  50                           ? MEMMOVE_Z13
  51                           : MEMMOVE_DEFAULT;
  52                       })
  53                       )
  54 #endif