Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r251047:
Avoid a nested frame for getcontext() call in check_deferred_signal().

MFC r246117:
Rework the __vdso_* symbols attributes to only make the symbols weak,
but use normal references instead of weak. This makes the statically
linked binaries to use fast gettimeofday(2) by forcing the linker to
resolve references and providing the neccessary functions.

MFC: r231616, r232497, r234337

Add __aeabi_read_tp function required for thread-local storage.

MFC: r233106, r233107

Fix TLS for statically linked binaries.

MFC r230188i (by das):
Correct some bugs that resulted from arm/_fpmath.h being blindly copied
from the x86 version, which has a completely different long double
format.

MFC r230429:
Add API for obtaining extended machine context states that cannot be
fit into existing mcontext_t.

On i386 and amd64 do return the extended FPU states using
getcontextx(3). For other architectures, getcontextx(3) returns the
same information as getcontext(2).

MFC r230864:
Make the sys/ucontext.h self-contained by changing the return type
of __getcontextx_size(3) from size_t to int.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix typos - remove duplicate "the".

PR: bin/154928
Submitted by: Eitan Adler <lists at eitanadler.com>
MFC after: 3 days

The NetBSD Foundation has granted permission to remove clause 3 and 4 from
their software.

Obtained from: NetBSD

Remove unneeded stdlib directories.

It's not necessary to add stdlib directories for each architecture, even
if the architecture doesn't implement any files of its own.

Submitted by: Christoph Mallon

- Eliminate extra subcs instruction. I have not noticed before that we
always perform substraction now, so no instruction could be rordered
to eliminate the conditional substraction.

- Fix strncmp on arm. Return 0 as result without performing the
main cycle only if the len passed is equal to 0. If end address
overflows use last possible address as the end address.

Based on: discussion on arm@
MFC after: 1 month

Use GCC's __SOFTFP__ to test whether we're being compiled
with softfloat or not. Now -msoft-float can be overridden
more easily.

revert r191633; this breaks at91 & xscale (likely all arm)

Change the test at the beginning of strncmp(), from being if (len - 1) < 0
to if (len == 0).
The length is supposed to be unsigned, so len - 1 < 0 won't happen except
if len == 0 anyway, and it would return 0 when it shouldn't, if len was
> INT_MAX.

Spotted out by: Channa <channa kad gmail com>

These warnings are only relevant on NetBSD it seems. They don't seem
to be relevant to FreeBSD at all.

Add support for the FPA floating-point format on ARM. The
FPA floating-point format is identical to the VFP format,
but is always stored in big-endian.
Introduce _IEEE_WORD_ORDER to describe the byte-order of
the FP representation.

Obtained from: Juniper Networks, Inc

Mark uname(), getdomainname() and setdomainname() with COMPAT_FREEBSD4.

Looking at our source code history, it seems the uname(),
getdomainname() and setdomainname() system calls got deprecated
somewhere after FreeBSD 1.1, but they have never been phased out
properly. Because we don't have a COMPAT_FREEBSD1, just use
COMPAT_FREEBSD4.

Also fix the Linuxolator to build without the setdomainname() routine by
just making it call userland_sysctl on kern.domainname. Also replace the
setdomainname()'s implementation to use this approach, because we're
duplicating code with sysctl_domainname().

I wasn't able to keep these three routines working in our
COMPAT_FREEBSD32, because that would require yet another keyword for
syscalls.master (COMPAT4+NOPROTO). Because this routine is probably
unused already, this won't be a problem in practice. If it turns out to
be a problem, we'll just restore this functionality.

Reviewed by: rdivacky, kib

Let libstand(3) build on ARM.

This is a pre-requisite for loader(8) + U-Boot support library on this arch.

Arrange so that the NaN returned by strtod("nan", NULL) is the same as
the NaN returned by strtod("nan()", NULL).

Unbreak arm build by removing duplicate symbols.

MFKernel: do not use __XSCALE__ to detect if clz/pld/ldrd/strd are
available, use _ARM_ARCH_5/_ARM_ARCH_5E instead.

MFC After: 3 days

Fix remaining syntax errors (missing semicolons)

Submitted by: Björn König <bkoenig@cs.tu-berlin.de>
Approved by: re (kensmith, followup commits)

Add missing \ characters in PSEUDO() macro on arm. Oops.

Submitted by: cognet
Approved by: re (kensmith)

Classify mmap, lseek, pread, pwrite, truncate, ftruncate as pseudo
syscalls, unless WITHOUT_SYSCALL_COMPAT is defined. The default case
will have the .c wrappers still. If you define WITHOUT_SYSCALL_COMPAT,
the .c wrappers will go away and libc will make direct syscalls.

After 7-stable starts, the direct syscall method will be default.

Approved by: re (kensmith)

Adjust the syscall stub macros to be consistent in their meaning. In
particular:
SYSCALL() makes a syscall, with errno handling, and continues execution
directly after the macro in the non-error case.
RSYSCALL() is just like SYSCALL(), but returns after success.
Both SYSCALL(name) and RSYSCALL(name) export "__sys_name" as a strong
symbol, with "_name" and "name" as weak aliases.
PSEUDO() is just like RSYSCALL(), but skipping the "name" weak alias. It
still does "__sys_name" and "_name".

Change i386 to add errno handling to PSEUDO. The same for amd64 and
sparc64, with appear to have copied the behavior.
ia64 was correct (as was alpha). Just remove some apparently unused
variants of the macros. (untested!)
I believe powerpc is correct.
Fix arm to not export "name" from the PSEUDO case. Remove apparently
extra unused variants. (untested!)

The errno problem manifested on i386/amd64/sparc64 by having "PSEUDO"
classified syscalls return without setting errno. eg: "addr = mmap()"
could return with "addr" = 22 instead of setting errno to 22 and
returning -1.

Approved by: re (kensmith)

Fix sbrk.S to use _end symbol the same way brk.s was fixed some time
ago. sbrk.S should have gotten the same change then but was forgotten.

Approved by: re (bmah)
PR: kern/114049

Some libc symbol map cleanups.

net: endhostdnsent is named _endhostdnsent and is
private to netdb family of functions.

posix1e: acl_size.c has been never compiled in,
so there's no "acl_size".

rpc: "getnetid" is a static function.

stdtime: "gtime" is #ifdef'ed out in the source.

some symbols are specific only to some architectures,
e.g., ___tls_get_addr is only defined on i386.

__htonl, __htons, __ntohl and __ntohs are no longer
functions, they are now (internal) defines in
<machine/endian.h>.

Submitted by: ru

Use __mcount() instead of _mcount() to reduce diffs with NetBSD.

Use built-in _end symbol insteadof 'end' for consistency with other
architectures. Linker defines end is synonym for _end.

Do not declare float_detect_tininess as external if it will be re-delared
as static later.

Do not export 'end' symbol. It is not meant to be visible to outside
world and it wreak havoc if libc collides with other versioned
libraries.

Remove .mcount from gmon's Symbol map and add it to the appropriate
arch. It can be named differently depending on the arch (.mcount,
_mcount).

Submitted by: marius

Use C comments since we now preprocess these files with CPP.

The distinction between quiet and signaling NaN formats is
machine-dependent; these files tell the latest version of gdtoa
what to do.

Cleanup: we always have to use __error() now, and we shouldn't provide a
errno symbol, so completely remove the !_REENTRANT case.

Spotted out by: ru

Remove a forgotten file.

Instead of re-implementing hton[ls] and friends for each arch, add a new MI
file, net/ntoh.c, which just implement them using the inline functions from
<sys/endian.h>.

Suggested by: bde

Provide definitions suitable for arm big-endian.

If __ARMEB__ is defined, we're already using the network byte order, so
there's no need to to anything in the hton* functions, beside returning
the parameter.

Spotted out by: Oleksandr Tymoshenko <gonzo@freebsd.org>

GC old a.out and K&R support.

Add each directory's symbol map file to SYM_MAPS.

Add symbol maps and initial symbol version definitions to libc.

Reviewed by: davidxu

Fix a long line in copyright notice.

Pointed out by: Gavin Atkinson gavin.atkinson ury york ac uk

Add an asm version of strlen() for arm (how useful).

Use the correct values for softfloat, in both the little endian and the big
endian cases.

Define LDBL_NBIT to be a mask indicating the position of the integer
bit in a long double. For architectures that don't have such a bit,
LDBL_NBIT is 0. This makes it possible to say `mantissa & ~LDBL_NBIT'
in places that previously used an #ifdef to select the right expression.
The optimizer should dispense with the extra arithmetic when LDBL_NBIT
is 0.

Update my email address.

Replace the ldexp() implementation in libc with a renamed copy of the
scalbn() implementation from libm. (The two functions are defined to
be identical, but ldexp() lives in libc for backwards compatibility.)
The old ldexp() implementation...
- was more complicated than this one
- set errno instead of raising FP exceptions
- got some corner cases wrong
(e.g. ldexp(1.0, 2000) in round-to-zero mode)

The new implementation lives in libc/gen instead of
libc/$MACHINE_ARCH/gen, since we don't need N copies of a
machine-independent file. The amd64 and i386 platforms
retain their fast and correct MD implementations and
override this one.

Eliminate gdtoa.mk and move its contents to ${MACHINE_ARCH}/Makefile.inc.
The purpose of having a separate file involved an abandoned scheme that
would have kept contrib/gdtoa out of the include path for the rest of libc.

Use the RET macro.
For setjmp() and longjmp(), put the signal mask where it's supposed to be,
instead of in the space reserved for fp regs.

Add a week alias __siglongjmp => siglongjmp.

MFKernel: Implement ffs with clz on Xscale.

Don't define SOFTFLOAT directly in source files, it's now done in the Makefile.

Fix signalcontext and makecontext.

Remove getcontext.S, it is not needed.

Import a Makefile for arm.

Make setjmp()/longjmp() use sigprocmask.

Add a dummy set_tp().

Always use bx for returning on Xscale.

Obtained from: NetBSD

Fix the align-to-32-bits code.

Obtained from: NetBSD

Replace seven nominally MD implementations of frexp() that are broken
for subnormals with one implementation that works.

Implement the classification macros isfinite(), isinf(), isnan(), and
isnormal() the hard way, rather than relying on fpclassify(). This is
a lose in the sense that we need a total of 12 functions, but it is
necessary for binary compatibility because we have never bumped libm's
major version number. In particular, isinf(), isnan(), and isnanf()
were BSD libc functions before they were C99 macros, so we can't
reimplement them in terms of fpclassify() without adding a dependency
on libc.so.5. I have tried to arrange things so that programs that
could be compiled in FreeBSD 4.X will generate the same external
references when compiled in 5.X. At the same time, the new macros
should remain C99-compliant.

The isinf() and isnan() functions remain in libc for historical
reasons; however, I have moved the functions that implement the macros
isfinite() and isnormal() to libm where they belong. Moreover,
half a dozen MD versions of isinf() and isnan() have been replaced
with MI versions that work equally well.

Prodded by: kris

Import the FreeBSD/arm libc bits.

Obtained from: NetBSD