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elf: Remove LD_HWCAP_MASK / tunable glibc.cpu.hwcap_mask
Remove the environment variable LD_HWCAP_MASK and the tunable glibc.cpu.hwcap_mask as those are not used anymore in common-code after removal in elf/dl-cache.c:search_cache(). The only remaining user is sparc32 where it is used in elf_machine_matches_host(). If sparc32 does not need it anymore, we can get rid of it at all. Otherwise we could also move LD_HWCAP_MASK / tunable glibc.cpu.hwcap_mask to be sparc32 specific. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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@ -83,13 +83,6 @@ glibc {
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minval: 0
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}
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}
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cpu {
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hwcap_mask {
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type: UINT_64
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env_alias: LD_HWCAP_MASK
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default: HWCAP_IMPORTANT
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}
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}
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elision {
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enable {
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@ -52,7 +52,6 @@ static const struct envvar_t filtered_envvars[] =
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{
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{ "GLIBC_TUNABLES", FILTERED_VALUE },
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{ "LD_AUDIT", FILTERED_VALUE },
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{ "LD_HWCAP_MASK", FILTERED_VALUE },
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{ "LD_LIBRARY_PATH", FILTERED_VALUE },
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{ "LD_PRELOAD", FILTERED_VALUE },
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{ "LD_PROFILE", PROFILE_LIB },
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@ -96,11 +96,11 @@ where 'check' is the tunable name and 'val' is a value of same type.
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To get and set tunables in a different namespace from that module, use the full
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form of the macros as follows:
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val = TUNABLE_GET_FULL (glibc, cpu, hwcap_mask, uint64_t, NULL)
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val = TUNABLE_GET_FULL (glibc, malloc, mmap_max, int32_t, NULL)
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TUNABLE_SET_FULL (glibc, cpu, hwcap_mask, val)
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TUNABLE_SET_FULL (glibc, malloc, mmap_max, val)
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where 'glibc' is the top namespace, 'cpu' is the tunable namespace and the
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where 'glibc' is the top namespace, 'malloc' is the tunable namespace and the
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remaining arguments are the same as the short form macros.
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The minimum and maximum values can updated together with the tunable value
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@ -114,11 +114,11 @@ where 'check' is the tunable name, 'val' is a value of same type, 'min' and
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To set the minimum and maximum values of tunables in a different namespace
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from that module, use the full form of the macros as follows:
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val = TUNABLE_GET_FULL (glibc, cpu, hwcap_mask, uint64_t, NULL)
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val = TUNABLE_GET_FULL (glibc, malloc, mmap_max, int32_t, NULL)
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TUNABLE_SET_WITH_BOUNDS_FULL (glibc, cpu, hwcap_mask, val, min, max)
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TUNABLE_SET_WITH_BOUNDS_FULL (glibc, malloc, mmap_max, val, min, max)
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where 'glibc' is the top namespace, 'cpu' is the tunable namespace and the
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where 'glibc' is the top namespace, 'malloc' is the tunable namespace and the
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remaining arguments are the same as the short form macros.
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When TUNABLE_NAMESPACE is not defined in a module, TUNABLE_GET is equivalent to
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@ -55,7 +55,6 @@ glibc.cpu.x86_non_temporal_threshold: 0xc0000 (min: 0x4040, max: 0xfffffffffffff
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glibc.cpu.x86_memset_non_temporal_threshold: 0xc0000 (min: 0x4040, max: 0xfffffffffffffff)
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glibc.cpu.x86_shstk:
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glibc.pthread.stack_cache_size: 0x2800000 (min: 0x0, max: 0xffffffffffffffff)
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glibc.cpu.hwcap_mask: 0x6 (min: 0x0, max: 0xffffffffffffffff)
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glibc.malloc.mmap_max: 0 (min: 0, max: 2147483647)
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glibc.elision.skip_trylock_internal_abort: 3 (min: 0, max: 2147483647)
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glibc.cpu.plt_rewrite: 0 (min: 0, max: 2)
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@ -504,16 +503,6 @@ Behavior of @theglibc{} can be tuned to assume specific hardware capabilities
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by setting the following tunables in the @code{cpu} namespace:
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@end deftp
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@deftp Tunable glibc.cpu.hwcap_mask
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This tunable supersedes the @env{LD_HWCAP_MASK} environment variable and is
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identical in features.
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The @code{AT_HWCAP} key in the Auxiliary Vector specifies instruction set
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extensions available in the processor at runtime for some architectures. The
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@code{glibc.cpu.hwcap_mask} tunable allows the user to mask out those
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capabilities at runtime, thus disabling use of those extensions.
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@end deftp
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@deftp Tunable glibc.cpu.hwcaps
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The @code{glibc.cpu.hwcaps=-xxx,yyy,-zzz...} tunable allows the user to
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enable CPU/ARCH feature @code{yyy}, disable CPU/ARCH feature @code{xxx}
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@ -12,7 +12,6 @@
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"LD_DEBUG\0" \
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"LD_DEBUG_OUTPUT\0" \
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"LD_DYNAMIC_WEAK\0" \
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"LD_HWCAP_MASK\0" \
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"LD_LIBRARY_PATH\0" \
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"LD_ORIGIN_PATH\0" \
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"LD_PRELOAD\0" \
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@ -39,13 +39,7 @@ elf_machine_matches_host (const Elf32_Ehdr *ehdr)
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return 1;
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else if (ehdr->e_machine == EM_SPARC32PLUS)
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{
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#if defined SHARED
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uint64_t hwcap_mask = TUNABLE_GET (glibc, cpu, hwcap_mask, uint64_t,
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NULL);
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return GLRO(dl_hwcap) & hwcap_mask & HWCAP_SPARC_V9;
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#else
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return GLRO(dl_hwcap) & HWCAP_SPARC_V9;
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#endif
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}
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else
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return 0;
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