branches: 1.29.16;
Back out last change; fixed in the correct place.

Require ARMv5TE to assemble.

Move arm sync_* changes to Makefile.inc

Provide C++ 2011 <atomic> support functions for hppa and arm.

Move the and_{16,8}_nv sources into the right (libc only) block.

Provide __sync_and_and_fetch_2 and __sync_and_and_fetch_1 for pre-ARMv6,
they are needed for the C++ 2011 <atomic> stuff.

branches: 1.23.2;
Provide a basic implementation of __atomic_load_* and __atomic_store_*,
used by GCC and LLVM as backing for C11/C++11 atomics, if the hardware
is not known to have corresponding features. Include it on ARM as LLVM
and libc++ hit it when compiled for ARMv4.

branches: 1.22.2;
Don't export __sync* if _KERNEL || _STANDALONE are defined.
(except if _RUMPKERNEL is defined)

fix typo.

Add atomic_sub_64.S

Add atomic_cas_64 support for ARM EABI on V5TE and V5TEJ cpus.
(strd is atomic).

Missed one __sync_* op (or gcc4.8 does inline it, while 4.5 does not?)

Move the __sync_* ops added in the previous change to a libc-only section

Provide the missing __sync_* ops for earlier arm versions

Add _atomic_cas_16_up and _atomic_cas_8_up

Add support for the gcc __sync builtins.
Note that these need earmv6 or later to get the ldrex/strex instructions

Rework to allow thumb armv7 compilation.
Add atomic_simplelock.c for thumb

Only use MACHINE_ARCH if !_STANDALONE and CPPFLAGS/CFLAGS/CPUFLAGS don't
contain -mcpu or -march

Select ldrex/strex if ${MACHINE_ARCH:Mearmv[67]*}

branches: 1.10.2;
Add 64bit atomic ops for ARMv6+ (using ldrexd/strexd).

Actually use the assembly version of the atomic function if compiling
for armv6 or armv7 cpus. Use atomic_cas_ptr instead of _lock_cas so
we pick up the assembly version when it's used.

branches: 1.8.8; 1.8.12;
allow inclusion of atomic ops in librump

branches: 1.7.8;
Allow atomic ops to be built as part of libpthread.

Implement _atomic_cas_up() in assembly code as the compiler cannot be
trusted to generate fully restartable code sequences.

Addresses lib/38482 for ARM and m68000.

branches: 1.5.4;
Only build atomic ops for libkern/libc.

Enable the atomic ops in userspace.

branches: 1.3.4;
Use the CAS-based inc/dec variants, since these CPUs don't have atomic
add in hardware (does arm?).

Atomic ops for arm.

branches: 1.1.2;
file Makefile.inc was initially added on branch thorpej-atomic.