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this cleans up what had become widespread direct inline use of "GNU C"
style attributes directly in the source, and lowers the barrier to
increased use of hidden visibility, which will be useful to recovering
some of the efficiency lost when the protected visibility hack was
dropped in commit dc2f368e565c37728b0d620380b849c3a1ddd78f, especially
on archs where the PLT ABI is costly.
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analogous to commit 5bf7eba213cacc4c1220627c91c28deff2ffecda, use of
AT_PHDR/PT_PHDR does not actually work to find the program base, and
the method with _DYNAMIC vs PT_DYNAMIC must be used as an alternative.
patch by Shiz, along with testing to confirm that this fixes unwinding
in static PIE.
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this could only happen if an incomplete auxv was passed into the
program, but it's better to just initialize the data anyway.
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like elsewhere, use a weak alias that the dynamic linker will override
with a more complete version capable of handling shared libraries.
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patches by Alex Caudill (npx). the dynamic-linked version is almost
identical to the final submitted patch; I just added a couple missing
lines for saving the phdr address when the dynamic linker is invoked
directly to run a program, and removed a couple to avoid introducing
another unnecessary type. the static-linked version is based on npx's
draft. it could use some improvements which are contingent on the
startup code saving some additional information for later use.
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