Implement ffs(3) using the CLZ instructions which has been available ever
since ARMv5. Should be much faster but more importantly it removes the
data table from .text which could introduce unwanted

Implement ffs(3) using the CLZ instructions which has been available ever
since ARMv5. Should be much faster but more importantly it removes the
data table from .text which could introduce unwanted ROP gadgets.

Based on changes in Android/Bionic by Elliott Hughes.

ok patrick@

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Partial revert of rev. 1.7, fixes build with clang

The error was:
--8<--
ffs.S:57:2: error: unsupported relocation on symbol
adrne r2, .L_ffs_table
^
-->8--

Minimal workaround suggested by deraadt@

Partial revert of rev. 1.7, fixes build with clang

The error was:
--8<--
ffs.S:57:2: error: unsupported relocation on symbol
adrne r2, .L_ffs_table
^
-->8--

Minimal workaround suggested by deraadt@, ok guenther@ kettenis@

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Instead of trying to handle ffs() with the normal rename-mark-hidden-and-alias
dance, mark it protected. This works better for both gcc and clang: gcc
blocks overriding of internal calls, while clan

Instead of trying to handle ffs() with the normal rename-mark-hidden-and-alias
dance, mark it protected. This works better for both gcc and clang: gcc
blocks overriding of internal calls, while clang permits inlining again.

ok otto@

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Use unified syntax such that this compiles with both gcc and clang.

ok jsg@

Use internal names for __errno, _memcpy, memset, and {,_}{set,long}jmp
Eliminate pointless use of PIC_SYM()
Split out DEFS.h from SYS.h like some other archs

ok kettenis@ deraadt@

Add framework for resolving (pun intended) libc namespace issues, using
wrapper .h files and asm labels to let internal calls resolve directly and
not be overridable or use the PLT. Then, apply that

Add framework for resolving (pun intended) libc namespace issues, using
wrapper .h files and asm labels to let internal calls resolve directly and
not be overridable or use the PLT. Then, apply that framework to most of
the functions in stdio.h, string.h, err.h, and wchar.h. Delete the
should-have-been-hidden-all-along _v?(err|warn)[cx]? symbols while here.

tests clean on i386, amd64, sparc64, powerpc, and mips64

naming feedback from kettenis@ and millert@
ok kettenis@

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more rcsid/sccs cleanup

ARGH, forgot tags.

arm libc support. From NetBSD. currently supports softfloat.