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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-04-05 15:24:30 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-04-07 08:09:47 -0700 |
| commit | 32ffd2e11cfe3f7c71988bca8cbe0ba514e71340 (patch) | |
| tree | aceb8c8179af8bae4f1a27f2e6a98455fb0698d4 /sysdeps/x86_64/dl-hwcap.h | |
| parent | bf7730194fed694a9ce821c306683266a5a7b78b (diff) | |
| download | glibc-32ffd2e11cfe3f7c71988bca8cbe0ba514e71340.tar.gz glibc-32ffd2e11cfe3f7c71988bca8cbe0ba514e71340.tar.xz glibc-32ffd2e11cfe3f7c71988bca8cbe0ba514e71340.zip | |
x86: Set dl_hwcap from CPU features hjl/hwcap/master
On x86, the usage of AT_HWCAP in glibc is obsolete since addition of dl_x86_cpu_features. dl_hwcap, which was set from AT_HWCAP, is used by dynamic linker to build an array of hardware capability names, which are added to search path when loading shared object. dl_hwcap was unused on x86-64 and only SSE2 was used on i386. This patch sets dl_hwcap with new hardware capabilities from CPU features. Currently, 2 capabilities, SSE2 and AVX2, are supported. The maximum number of hardware capabilities is 64. Since x86-64 includes SSE2, SSE2 is skipped on x86-64. dl_x86_cap_flags is kepted for i386 and is used by _dl_show_auxv. dl_x86_hwcap_flags is added for new hardware capabilities. * sysdeps/i386/dl-hwcap.h: New file. * sysdeps/x86/dl-hwcap.h: Likewise. * sysdeps/x86_64/dl-hwcap.h: Likewise. * sysdeps/x86_64/dl-procinfo.h: Likewise. * sysdeps/i386/dl-procinfo.c (_dl_x86_hwcap_flags): New. * sysdeps/i386/dl-procinfo.h: Include <dl-hwcap.h>. (_DL_HWCAP_COUNT): Removed. (HWCAP_I386_XXX): Likewise. (HWCAP_IMPORTANT): Likewise. (_dl_procinfo): Likewise. (_dl_hwcap_string): Likewise. (_dl_string_hwcap): Likewise. * sysdeps/unix/sysv/linux/i386/dl-procinfo.h (_dl_procinfo): Replace _DL_HWCAP_COUNT with 32. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.h [!IS_IN (ldconfig)]: Include <sysdeps/x86_64/dl-procinfo.h>. * sysdeps/x86/cpu-features.c: Include <dl-hwcap.h>. (init_cpu_features): Set dl_hwcap and dl_hwcap_mask. * sysdeps/x86_64/dl-procinfo.c (_dl_x86_hwcap_flags): New.
Diffstat (limited to 'sysdeps/x86_64/dl-hwcap.h')
| -rw-r--r-- | sysdeps/x86_64/dl-hwcap.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/sysdeps/x86_64/dl-hwcap.h b/sysdeps/x86_64/dl-hwcap.h new file mode 100644 index 0000000000..6e31fa91be --- /dev/null +++ b/sysdeps/x86_64/dl-hwcap.h @@ -0,0 +1,25 @@ +/* x86-64 version of hardware capability information handling macros. + 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/>. */ + +#ifndef _DL_HWCAP_H +#define _DL_HWCAP_H +#include <sysdeps/x86/dl-hwcap.h> + +#define HWCAP_IMPORTANT (HWCAP_X86_AVX2) + +#endif /* dl-hwcap.h */ |