Sync with compat and remove dup implementations of ldexp and modf, switching
mips and m68k to the compat copies.

branches: 1.34.2;
cache stuff needs _KERNTYPES

Properly support the MIPS TLS ABI.

Make the MIPS N32/N64 ABIs properly support 128-bit long doubles. With this
change, we should be fully conformant with the N32 and N64 ABIs.
Add {fpclassify,infinity,isnan,ininf,signbit}l_ieee754.c back to lib/libc/gen.
Note that infinityl_ieee754.c will work with either 64-bit, 80-bit, or
128-bit long doubles.

Pullup fixes from matt-nb5-mips64.
This makes setjmp/longjmp work again.

Merge from matt-nb5-mips64.

Rename ${SRCS.{alpha,arm,...}.gen} to ${LSRCS.{alpha,arm,...}.gen} because
they ended up in ${LSRCS}, not ${SRCS}. ${SRCS.*} namespace will be used
for more useful things. No functional changes intended.

branches: 1.28.34;
build frexp_ieee754 in the "compat" subtree
(There are assembler versions of ldexp and modf which need to be checked.
I'm in doubt they are metter than those in libm.)

Follow compat libc changes on i386:
> _setjmp and _longjmp are not compat functions. Noticed by Havard Eidnes

Switch mips to the new libc compat code layout.

Push back the descriptions of NaN formats, and descriptions of the
distinction between signalling NaNs and quiet NaNs back into the
machine-dependent headers; treat the implementation of __nanf in the
same spirit.

IEEE 754 leaves the distinction between signalling NaNs and quiet NANs
to the implementation, and unlike our headers used to suggest they're
not identical in the interpretation of the fraction's MSb; in due
course, make those of hppa, mips, sh3, and sh5 reflect reality.

branches: 1.24.6;
Actually compile __longjmp14.c.

* Turn isinf(3) and isnan(3) into C99-style macros.
* Make it possible for ports to override these (i.e., VAX).
* Remove isnanl(), which was internal to libc only.

Add C99 fpclassify(), isfinite(), isnormal(), and signbit() macros.

Add __infinityf and __infinityl, float respectively long double analogs
of __infinity.

Correct another typo.

Pasto in previous.

* Since there is no single portable IEEE 754 format for a long double,
keep a common implementation of isinfl() and isnanl() to be used by
platforms where `long double' == `double'; move others into
machine-dependent code.
* In due course, consider __VFP_FP__ on arm.

Rework how dependency generation is performed:

* DPSRCS contains extra dependencies, but is _NOT_ added to CLEANFILES.
This is a change of behaviour. If a Makefile wants the clean semantics
it must specifically append to CLEANFILES.
Resolves PR toolchain/5204.

* To recap: .d (depend) files are generated for all files in SRCS and DPSRCS
that have a suffix of: .c .m .s .S .C .cc .cpp .cxx

* If YHEADER is set, automatically add the .y->.h to DPSRCS & CLEANFILES

* Ensure that ${OBJS} ${POBJS} ${LOBJS} ${SOBJS} *.d depend upon ${DPSRCS}

* Deprecate the (short lived) DEPENDSRCS


Update the various Makefiles to these new semantics; generally either
adding to CLEANFILES (because DPSRCS doesn't do that anymore), or replacing
specific .o dependencies with DPSRCS entries.

Tested with "make -j 8 distribution" and "make distribution".

Build _isinfl() and _isnanl().

Rename ieee754_function.c to function_ieee754.c, following the convention
used in exec_format.c, loadfile_format.c, subsys_machdep.c etc.
Per discussion with Christos.

Merge the nathanw_sa branch.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

branches: 1.12.6;
remove MIPS SOFTFLOAT.

C99: Define a NAN macro in <math.h> which evaulates to a constant expression of
a single-precision quiet NaN; only to be defined on platforms that do support
this value.

Hpcmips needs completely FPU instruction free user land.
XXX, this modification is kinda ad-hoc.

branches: 1.9.2;
Use C versions of isinf() and isnan(). The assembler code is basically
identical, but was endian-dependent.

* Fix typo in Makefile.inc -- byte_swap_2.4 -> byte_swap_4.S
* Change bytes_swap_4.S to have consistent NLEAF and END for swap routine.

Move the bswap functions from libutil to libc (this bups the
minor of libc and the major of libutil). For little-endian architectures
merge the bnswap() assembly versions with nto* and hton* using symbols
aliasing. Use symbol renaming for the bswap function in this case to avoid
namespace pollution.
Declare bswap* in machine/bswap.h, not machine/endian.h. For little-endian
machines, common code for inline macros go in machine/byte_swap.h
Sync libkern with libc.
Adjust #include in kernel sources for machine/bswap.h.

mips libc stubs for sig*14 signal API (128bit sigset_t),
plus backward-compatibility for the old 1.3 libc entrypoints.

Cacheflush support code for mips CPUs.
Used by GCC's lexical-closure trampoline code.

Add sigsetjmp.S for mips, and add it to the makefile.

Added __flt_rounds, fp{get,set}{mask,round,sticky}.

don't forget inifinity.c

need these for new gen/Makefile