sysdeps/powerpc/powerpc32/power4/multiarch/memcpy.c

   1 /* Multiple versions of memcpy.
   2    Copyright (C) 2013-2021 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 /* Define multiple versions only for the definition in lib and for
  20    DSO.  In static binaries we need memcpy before the initialization
  21    happened.  */
  22 #if defined SHARED && IS_IN (libc)
  23 # undef memcpy
  24 # define memcpy __redirect_memcpy
  25 # include <string.h>
  26 # include <shlib-compat.h>
  27 # include "init-arch.h"
  28
  29 extern __typeof (memcpy) __memcpy_ppc attribute_hidden;
  30 extern __typeof (memcpy) __memcpy_cell attribute_hidden;
  31 extern __typeof (memcpy) __memcpy_power6 attribute_hidden;
  32 extern __typeof (memcpy) __memcpy_a2 attribute_hidden;
  33 extern __typeof (memcpy) __memcpy_power7 attribute_hidden;
  34 # undef memcpy
  35
  36 /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
  37    ifunc symbol properly.  */
  38 libc_ifunc_redirected (__redirect_memcpy, memcpy,
  39                        (hwcap & PPC_FEATURE_HAS_VSX)
  40                        ? __memcpy_power7
  41                        : (hwcap & PPC_FEATURE_ARCH_2_06)
  42                          ? __memcpy_a2
  43                          : (hwcap & PPC_FEATURE_ARCH_2_05)
  44                            ? __memcpy_power6
  45                            : (hwcap & PPC_FEATURE_CELL_BE)
  46                              ? __memcpy_cell
  47                              : __memcpy_ppc);
  48 #endif