I tried sleep with LD_SHOW_AUX=1 set, and my AT_HWCAP values were the human-readable processor capabilities I get when I cat /proc/cpuinfo. Plus, I had an extra entry at the beginning, AT_SYSINFO.
FWIW I have GLIBC version 2.13 (which implies the getauxval() call isn't available to me). Just sharing my experiences here; thanks for the article!
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