glibc/elf/dl-hwcaps.h

/* Hardware capability support for run-time dynamic loader.
   Copyright (C) 2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <elf/dl-tunables.h>

#ifdef SHARED
# if HAVE_TUNABLES
#  define GET_HWCAP_MASK() \
  TUNABLE_GET (glibc, tune, hwcap_mask, uint64_t, NULL)
# else
#  define GET_HWCAP_MASK() GLRO(dl_hwcap_mask)
# endif
#else
/* HWCAP_MASK is ignored in static binaries.  */
# define GET_HWCAP_MASK() (0)
#endif
tunables: Use glibc.tune.hwcap_mask tunable instead of _dl_hwcap_mask Drop _dl_hwcap_mask when building with tunables. This completes the transition of hwcap_mask reading from _dl_hwcap_mask to tunables. * elf/dl-hwcaps.h: New file. * elf/dl-hwcaps.c: Include it. (_dl_important_hwcaps)[HAVE_TUNABLES]: Read and update glibc.tune.hwcap_mask. * elf/dl-cache.c: Include dl-hwcaps.h. (_dl_load_cache_lookup)[HAVE_TUNABLES]: Read glibc.tune.hwcap_mask. * sysdeps/sparc/sparc32/dl-machine.h: Likewise. * elf/dl-support.c (_dl_hwcap2)[HAVE_TUNABLES]: Drop _dl_hwcap_mask. * elf/rtld.c (rtld_global_ro)[HAVE_TUNABLES]: Drop _dl_hwcap_mask. (process_envvars)[HAVE_TUNABLES]: Likewise. * sysdeps/generic/ldsodefs.h (rtld_global_ro)[HAVE_TUNABLES]: Likewise. * sysdeps/x86/cpu-features.c (init_cpu_features): Don't initialize dl_hwcap_mask when tunables are enabled. 2017-06-02 01:02:03 +08:00			`/* Hardware capability support for run-time dynamic loader.`
			`Copyright (C) 2017 Free Software Foundation, Inc.`
			`This file is part of the GNU C Library.`

			`The GNU C Library is free software; you can redistribute it and/or`
			`modify it under the terms of the GNU Lesser General Public`
			`License as published by the Free Software Foundation; either`
			`version 2.1 of the License, or (at your option) any later version.`

			`The GNU C Library is distributed in the hope that it will be useful,`
			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
			`Lesser General Public License for more details.`

			`You should have received a copy of the GNU Lesser General Public`
			`License along with the GNU C Library; if not, see`
			`<http://www.gnu.org/licenses/>. */`

			`#include <elf/dl-tunables.h>`

			`#ifdef SHARED`
			`# if HAVE_TUNABLES`
			`# define GET_HWCAP_MASK() \`
			`TUNABLE_GET (glibc, tune, hwcap_mask, uint64_t, NULL)`
			`# else`
			`# define GET_HWCAP_MASK() GLRO(dl_hwcap_mask)`
			`# endif`
			`#else`
			`/* HWCAP_MASK is ignored in static binaries. */`
			`# define GET_HWCAP_MASK() (0)`
			`#endif`