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author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-04-25 22:39:17 +0530 |
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committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-06-07 11:11:39 +0530 |
commit | f82e9672ad89ea1ef40bbe1af71478e255e87c5e (patch) | |
tree | 835c3688e6176ca52c9df51eb30f538d8d276ba9 /sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h | |
parent | ff08fc59e36e02074eba8ab39b0d9001363970f0 (diff) | |
download | glibc-f82e9672ad89ea1ef40bbe1af71478e255e87c5e.tar.gz glibc-f82e9672ad89ea1ef40bbe1af71478e255e87c5e.tar.xz glibc-f82e9672ad89ea1ef40bbe1af71478e255e87c5e.zip |
aarch64: Allow overriding HWCAP_CPUID feature check using HWCAP_MASK
Now that LD_HWCAP_MASK (or glibc.tune.hwcap_mask) is read early enough to influence cpu feature check in aarch64, use it to influence multiarch selection. Setting LD_HWCAP_MASK such that it clears HWCAP_CPUID will now disable multiarch for the binary. HWCAP_CPUID is also now set in HWCAP_IMPORTANT so that it is set by default. With this patch, this feature is only usable with dyanmically linked binaries because LD_HWCAP_MASK is not read for static binaries. A future patch fixes that. * sysdeps/unix/sysv/linux/aarch64/cpu-features.c (init_cpu_features): Use glibc.tune.hwcap_mask. * sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h: New file.
Diffstat (limited to 'sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h')
-rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h b/sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h new file mode 100644 index 0000000000..7a60d72844 --- /dev/null +++ b/sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h @@ -0,0 +1,44 @@ +/* Processor capability information handling macros - aarch64 version. + 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_PROCINFO_H +#define _DL_PROCINFO_H 1 + +#include <sys/auxv.h> + +/* We cannot provide a general printing function. */ +#define _dl_procinfo(type, word) -1 + +/* There are no hardware capabilities defined. */ +#define _dl_hwcap_string(idx) "" + +/* HWCAP_CPUID should be available by default to influence IFUNC as well as + library search. */ +#define HWCAP_IMPORTANT HWCAP_CPUID + +/* There're no platforms to filter out. */ +#define _DL_HWCAP_PLATFORM 0 + +/* We don't have any hardware capabilities. */ +#define _DL_HWCAP_COUNT 0 + +#define _dl_string_hwcap(str) (-1) + +#define _dl_string_platform(str) (-1) + +#endif /* dl-procinfo.h */ |