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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/i386/dl-procinfo.c | |
| parent | bf7730194fed694a9ce821c306683266a5a7b78b (diff) | |
| download | glibc-hjl/hwcap/master.tar glibc-hjl/hwcap/master.tar.gz glibc-hjl/hwcap/master.tar.bz2 glibc-hjl/hwcap/master.zip | |
x86: Set dl_hwcap from CPU featureshjl/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On x86, the usage of AT_HWCAP in glibc is obsolete since addition of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/i386/dl-procinfo.c')
| -rw-r--r-- | sysdeps/i386/dl-procinfo.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/sysdeps/i386/dl-procinfo.c b/sysdeps/i386/dl-procinfo.c index cec7dccfb8..acb800b342 100644 --- a/sysdeps/i386/dl-procinfo.c +++ b/sysdeps/i386/dl-procinfo.c @@ -79,6 +79,22 @@ PROCINFO_CLASS const char _dl_x86_cap_flags[32][8] #endif #if !defined PROCINFO_DECL && defined SHARED + ._dl_x86_hwcap_flags +#else +PROCINFO_CLASS const char _dl_x86_hwcap_flags[2][8] +#endif +#ifndef PROCINFO_DECL += { + "sse2", "avx2" + } +#endif +#if !defined SHARED || defined PROCINFO_DECL +; +#else +, +#endif + +#if !defined PROCINFO_DECL && defined SHARED ._dl_x86_platforms #else PROCINFO_CLASS const char _dl_x86_platforms[4][5] |