IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.

Merge from head

IFC @ r255209

MFC

Unconditionally compile the __sync_* atomics support functions into compiler-rt
for ARM.
This is quite ugly, because it has to work around a clang bug that does not
allow built-in functions to be def

Unconditionally compile the __sync_* atomics support functions into compiler-rt
for ARM.
This is quite ugly, because it has to work around a clang bug that does not
allow built-in functions to be defined, even when they're ones that are
expected to be built as part of a library.

Reviewed by: ed

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IFC @ r254014

IFC @253398

IFC @ r252047

Merge fresh head.

Build __clear_cache on ARM with clang now it supports it.

Let ARM use the custom tailored atomic intrinsics.

Use improved __sync_*() intrinsics for MIPS in userspace as well.

r251524 introduced custom tailored versions for MIPS of these functions
for kernel-space code. We can just reuse them in userspace a

Use improved __sync_*() intrinsics for MIPS in userspace as well.

r251524 introduced custom tailored versions for MIPS of these functions
for kernel-space code. We can just reuse them in userspace as well.

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Add __sync_synchronize().

This function can easily be implemented on top of the mb() macro
provided by <machine/atomic.h>.

Unbreak <stdatomic.h> on ARM + Clang.

Clang only supports atomic operations for ARMv6. For non-ARMv6, we still
need to emit these functions.

Clang's prototype for these functions slightly differs,

Unbreak <stdatomic.h> on ARM + Clang.

Clang only supports atomic operations for ARMv6. For non-ARMv6, we still
need to emit these functions.

Clang's prototype for these functions slightly differs, as it is truly
based on GCC's documentation. It requires the use of signed types, but
also requires varargs. Still, we are not allowed to simply implement
this function directly. Cleverly work around this by implementing it
under a different name and using __strong_reference().

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Enable libcompiler-rt on MIPS.

Originally we disabled libcompiler-rt on MIPS and SPARC64, because of an
issue where __clzdi2 and __ctzdi2 would cause endless recursion. This
bug has been fixed in r2

Enable libcompiler-rt on MIPS.

Originally we disabled libcompiler-rt on MIPS and SPARC64, because of an
issue where __clzdi2 and __ctzdi2 would cause endless recursion. This
bug has been fixed in r230021 already, but for some reason we only
switched to libcompiler-rt on SPARC64 -- not MIPS.

This means we can finally use <stdatomic.h> on all our architectures.

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IFC @247348.

Sync with HEAD.

Add the __aeabi_mem* functions to compiler-rt as clang uses them.

Use the compiler-rt version __{u,}divsi3 and __{u,}modsi3 on ARM EABI

There should have been a tab after SRCS+=

Add the __aeabi_*divmod functions to the compiler-rt build

IFC @ r244983.

Get libcompiler-rt and libgcc building on ARM with clang.

* Don't provide clear_cache or the __sync_* functions on ARM with clang as
they are provided by clang as builtin functions.
* Tell clang i

Get libcompiler-rt and libgcc building on ARM with clang.

* Don't provide clear_cache or the __sync_* functions on ARM with clang as
they are provided by clang as builtin functions.
* Tell clang it is aloud to compile some libgcc code using heinous GCC
extensions.

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IFC @ r238370

IFC @ r236291.
Diff reductions to the enclosure driver made in r235911.