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tunables: Add LD_HWCAP_MASK to tunables

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Add LD_HWCAP_MASK to tunables in preparation of it being removed from
rtld.c.  This allows us to read LD_HWCAP_MASK much earlier so that it
can influence IFUNC resolution in aarch64.

This patch does not actually do anything other than read the
LD_HWCAP_MASK variable and add the tunables way to set the
LD_HWCAP_MASK, i.e. via the glibc.tune.hwcap_mask tunable.  In a
follow-up patch, the _dl_hwcap_mask will be replaced with
glibc.tune.hwcap_mask to complete the transition.

	* elf/dl-tunables.list: Add glibc.tune.hwcap_mask.
	* scripts/gen-tunables.awk: Include dl-procinfo.h.
	* manual/tunables.texi: Document glibc.tune.hwcap_mask.
This commit is contained in:
Siddhesh Poyarekar
2017-04-17 10:00:35 +05:30
parent 44330b6d32
commit ea9b0ecbf0
4 changed files with 35 additions and 0 deletions
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scripts/gen-tunables.awk
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@ -134,6 +134,7 @@ END {
print "# error \"Do not include this file directly.\""
print "# error \"Include tunables.h instead.\""
print "#endif"
print "#include <dl-procinfo.h>\n"
# Now, the enum names
print "\ntypedef enum"