elf/dl-hwcaps.h

   1 /* Hardware capability support for run-time dynamic loader.
   2    Copyright (C) 2017-2020 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 <elf/dl-tunables.h>
  20
  21 #if HAVE_TUNABLES
  22 # define GET_HWCAP_MASK() TUNABLE_GET (glibc, cpu, hwcap_mask, uint64_t, NULL)
  23 #else
  24 # ifdef SHARED
  25 #   define GET_HWCAP_MASK() GLRO(dl_hwcap_mask)
  26 # else
  27 /* HWCAP_MASK is ignored in static binaries when built without tunables.  */
  28 #  define GET_HWCAP_MASK() (0)
  29 # endif
  30 #endif