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tunables: Use glibc.tune.hwcap_mask tunable instead of _dl_hwcap_mask

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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.
This commit is contained in:
Siddhesh Poyarekar
2017-06-01 22:32:03 +05:30
parent 6482e63403
commit ff08fc59e3
9 changed files with 77 additions and 4 deletions
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4
sysdeps/sparc/sparc32/dl-machine.h
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@ -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