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| author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-06-01 22:32:03 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-06-07 11:11:38 +0530 |
| commit | ff08fc59e36e02074eba8ab39b0d9001363970f0 (patch) | |
| tree | 1926c0dd4897a00b7541deb214bf6a1a480a8f8d /sysdeps | |
| parent | 6482e63403a3d13bf42f5029407b6151ad9f4ca5 (diff) | |
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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.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/generic/ldsodefs.h | 2 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc32/dl-machine.h | 4 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 4 |
3 files changed, 9 insertions, 1 deletions
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index f26a8b2051..695ac24c77 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -515,8 +515,10 @@ struct rtld_global_ro /* Mask for hardware capabilities that are available. */ EXTERN uint64_t _dl_hwcap; +#if !HAVE_TUNABLES /* Mask for important hardware capabilities we honour. */ EXTERN uint64_t _dl_hwcap_mask; +#endif #ifdef HAVE_AUX_VECTOR /* Pointer to the auxv list supplied to the program at startup. */ diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h index e17ac8e4cd..f9ae13300d 100644 --- a/sysdeps/sparc/sparc32/dl-machine.h +++ b/sysdeps/sparc/sparc32/dl-machine.h @@ -27,6 +27,7 @@ #include <sysdep.h> #include <tls.h> #include <dl-plt.h> +#include <elf/dl-hwcaps.h> /* Return nonzero iff ELF header is compatible with the running host. */ static inline int @@ -37,7 +38,8 @@ elf_machine_matches_host (const Elf32_Ehdr *ehdr) else if (ehdr->e_machine == EM_SPARC32PLUS) { #ifdef SHARED - return GLRO(dl_hwcap) & GLRO(dl_hwcap_mask) & HWCAP_SPARC_V9; + uint64_t hwcap_mask = GET_HWCAP_MASK(); + return GLRO(dl_hwcap) & hwcap_mask & HWCAP_SPARC_V9; #else return GLRO(dl_hwcap) & HWCAP_SPARC_V9; #endif diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index b481f50e75..4fe58bfd51 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -316,7 +316,11 @@ no_cpuid: /* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86. */ GLRO(dl_platform) = NULL; GLRO(dl_hwcap) = 0; +#if !HAVE_TUNABLES + /* The glibc.tune.hwcap_mask tunable is initialized already, so no need to do + this. */ GLRO(dl_hwcap_mask) = HWCAP_IMPORTANT; +#endif # ifdef __x86_64__ if (cpu_features->kind == arch_kind_intel) |