stand: Make pc98 build

This is a direct commit to stable/11 due to pc98 removal from head.

Several improvements in head that were MFC'd left the pc98 build broken in
stable/11. Massage the pc98 bits to get it to at least build.

MFC r325834,r325997,326502: Move sys/boot to stand/

This is effectively a direct commit to stable/11, due to differences between
stable/11 and head. Changes to DTS in sys/boot/fdt/dts were often
accompanied by kernel changes. Many of these were also risc-v updates that
likely had many more dependencies to MFC.

Because of this, sys/boot/fdt/dts remains as-is while everything else in
sys/boot relocates to stand/.

r325834: Move sys/boot to stand. Fix all references to new location

r325997: Remove empty directories.

r326502: Document the sys/boot -> stand move in hier.7 and the top-level README.

MFC r303555,r303556,r303936,r303962,r304317,r304532,r305026,r305107,r305132,
r305178,r305353,r305814,r306159,r306380,r306504: Loader fixes, 2016q3

r303555: bcache should support reads shorter than sector size

r303556: Improve boot loader quote parsing

r303936: Add kernel environment variables under smbios.system

r303962: Add the missing space between .asciz directive and opening quote
for some lines with #ifdef BTXLDR_VERBOSE/#endif

r304317: boot1.efi Free() should check for NULL to provide consistent
behavior

r304532: Replace sprintf -> snprintf for command_errbuf provisioned from
dynamic content.

r305026: Emulate efi_cons_poll when WaitForKey is not available

r305107: Create a hook 'post-initialize' for people that want to define
something to read in .conf files after all other .conf files for the purpose
of overriding.

r305132: Remove accidentally committed stray comment.

r305178: bd_int13probe() should check extended info if sector info is bad

r305353: Don't use -N to set the OMAGIC with data and text writeable and
data not page aligned.

r305814: ufsread: Do not cast struct direct from void *

r306159: Consistently declare getsecs(void) with proper return type and void
when no arguments are present.

r306380: loader command interpreter should reset command_errmsg

r306504: Fix a cluster of bugs in list EFI environment variables

PR: 204602, 211958, 211958
Relnotes: yes ("Improve boot loader quote parsing")

MFC r309412,r316109,r316132:

r309412 (by imp):

dd is currently a bootstrap tool. It really doesn't have any business
being a bootstrap tool. However, for reproducible build output,
FreeBSD added dd status=none because it was otherwise difficult to
suppress the status information, but retain any errors that might
happen. There's no real reason that dd has to be a build tool, other
than we use status=none unconditional. Remove dd from a bootstrap tool
entirely by only using status=none when available. This may also help
efforts to build the system on non-FreeBSD hosts as well.

r316109:

Don't hardcode input files for stage 1/2 bootloaders; use .ALLSRC instead

This is a better pattern to follow when creating the bootloaders and doing
the relevant space checks to make sure that the sizes aren't exceeded (and
thus, copy-pasting is a bit less error prone).

r316132:

Parameterize out 7680 (15 * 512) as BOOT2SIZE, similar to sys/boot/i386/zfsboot/...

This is being done to make it easier to change in the future--this action might be
needed sooner rather than later because of gcc 6.3.0 bailing, stating that there
is negative free space left (deficit) in the boot2 bootloader.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Implement (ACFLAGS|CFLAGS|CXXFLAGS).SRC globally.

Sponsored by: EMC / Isilon Storage Division

Ensure the cross assembler, linker and objcopy are used for the build32
stage, just like for the regular world stage.

Reviewed by: rodrigc, imp, bapt, emaste
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D2187

When compiling boot2 with gcc on i386 and pc98, only use the custom flag
-mno-align-long-strings when compiling with base gcc. This is checked
by comparing the version number against 4.2.1, which is not exactly
right, but good enough. (There is no other way to check whether we are
using the non-standard gcc in base, as far as I know.)

Reported by: rodrigc
MFC after: 3 days

MFi386:
When building some of the boot loaders with clang, and DEBUG_FLAGS or
CFLAGS having '-g' in it, clang outputs several assembly directives that
are too new for our version of binutils.

Therefore, assemble the resulting .s files with clang instead. A more
general solution can be implemented when a GNU as-compatible driver for
clang's integrated assembler appears.

Tested by: gjb

Upgrade our copy of clang, llvm and lldb to 3.5.0 release.

Please note that this version now requires C++11 support to build; see
UPDATING for more information.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.5.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.5.0/tools/clang/docs/ReleaseNotes.html>

Thanks to Ed Maste, Roman Divacky, Andrew Turner, Justin Hibbits and
Antoine Brodin for their invaluable help with this import.

Approved by: portmgr (antoine)
MFC after: 1 month

Reduce diffs against i386.

Revert r267233 for now. PIE support needs to be reworked.

1. 50+% of NO_PIE use is fixed by adding -fPIC to INTERNALLIB and other
build-only utility libraries.
2. Another 40% is fixed by generating _pic.a variants of various libraries.
3. Some of the NO_PIE use is a bit absurd as it is disabling PIE (and ASLR)
where it never would work anyhow, such as csu or loader. This suggests
there may be better ways of adding support to the tree. Many of these
cases can be fixed such that -fPIE will work but there is really no
reason to have it in those cases.
4. Some of the uses are working around hacks done to some Makefiles that are
really building libraries but have been using bsd.prog.mk because the code
is cleaner. Had they been using bsd.lib.mk then NO_PIE would not have
been needed.

We likely do want to enable PIE by default (opt-out) for non-tree consumers
(such as ports). For in-tree though we probably want to only enable PIE
(opt-in) for common attack targets such as remote service daemons and setuid
utilities. This is also a great performance compromise since ASLR is expected
to reduce performance. As such it does not make sense to enable it in all
utilities such as ls(1) that have little benefit to having it enabled.

Reported by: kib

Compile boot2 with clang on pc98.

Merge the clang support from i386. Don't move to clang yet.

In preparation for ASLR [1] support add WITH_PIE to support building with -fPIE.

This is currently an opt-in build flag. Once ASLR support is ready and stable
it should changed to opt-out and be enabled by default along with ASLR.

Each application Makefile uses opt-out to ensure that ASLR will be enabled by
default in new directories when the system is compiled with PIE/ASLR. [2]

Mark known build failures as NO_PIE for now.

The only known runtime failure was rtld.

[1] http://www.bsdcan.org/2014/schedule/events/452.en.html
Submitted by: Shawn Webb <lattera@gmail.com>
Discussed between: des@ and Shawn Webb [2]

Split the last gcc-specific flags off into CFLAGS.gcc. This also
removes the need to use -Qunused-arguments for clang throughout the
tree.

MFC after: 3 days

For sys/boot/i386 and sys/boot/pc98, separate flags to be passed
directly to the linker (LD_FLAGS) from flags passed indirectly, via the
compiler driver (LDFLAGS).

This is because several Makefiles under sys/boot/i386 and sys/boot/pc98
use ${LD} directly to link, and the normal LDFLAGS value should not be
used in these cases.

MFC after: 3 days

Fix pc98 build, by also forcing COMPILER_TYPE in sys/boot/pc98/boot2's
Makefile.

Pointy hat to: dim
MFC after: 3 days
X-MFC-With: r259730

Put in a band-aid to get the pc98 bootstraps building, now clang is the
default compiler. This has two parts:
- Make sys/boot/pc98/boot2 always build with gcc for now, until we can
figure out a way to shrink it enough when building with clang.
- Since sys/boot/p98/cdboot uses .code16 directives, which are not yet
supported by clang's integrated assembler, use -no-integrated-as,
similar to sys/boot/i386/cdboot.

Reviewed by: nyan
MFC after: 1 week

MFi386: revision 220337

Build boot2 with -mregparm=3.

Remove superfluous -mno-(mmx|3dnow|sse|sse2|sse3) flags in Makefiles
under sys/boot/{i386,pc98}, since these are already added via
sys/boot/{i386,pc98}/Makefile.inc.

Submitted by: arundel

When building world with clang, for gnu/lib/libobjc, sys/boot/i386/boot2
and sys/boot/pc98/boot2, do not simply assign 'gcc' to CC, since compile
flags are sometimes passed via this variable, for example during the
build32 stage on amd64. This caused the 32-bit libobjc build on amd64
to fail.

Instead, only replace the first instance of clang (if any, including
optional path) with gcc, and leave the arguments alone.

Approved-by: rpaulo (mentor)

Always compile pc98 boot2 with gcc instead of clang, just as with i386
boot2. Unfortunately both still are too big when compiled with clang.

Reviewed by: nyan
Approved by: rpaulo (mentor)

Reimplement the boot2 for pc98 completely.
It's based on the newest i386's one and has the advantage of:

- ELF binary support.
- UFS2 filesystem support.
- Many FreeBSD slices support on a disk.

Tested by: SATOU Tomokazu ( tomo1770 _ maple _ ocn _ ne _ jp ),
WATANABE Kazuhiro ( CQG00620 _ nifty _ ne _ jp ) and
nyan

MFC after: 2 week

Happy New Year in Japan!!

Cleanups the boot2 for pc98. There is no functional change.
- Make setting machine type and getting geom conditional for future.
- Remove unused RAWBOOT and CDBOOT supports.
- Remove unneeded include.
- Fix warnings.

MFC after: 1 week

Fix a fallout from SSP commit, and make this compile again.
Bonus: including kern.mk just to pick kernel warning flags
was an extremely bad idea anyway, because it also picked
up CFLAGS (it probably wasn't the case at the time of CVS
rev. 1.1, I haven't checked). Remove duplicate CWARNFLAGS
from CFLAGS.

Remove ifdef PC98.

Fix buidling of boot blocks for pc98 with new links.

Submitted by: nyan@

NOSHARED -> NO_SHARED

Start the dreaded NOFOO -> NO_FOO conversion.

OK'ed by: core

MFi386: revision 1.56 (Add -fno-unit-at-a-time to CFLAGS).

MFi386: Factor out -nostdlib and use PROG.

MFi386: Removed -elf and duplicate -ffreestanding.

MFi386: Cleanups to sys/boot makefiles.

Fixed sys/boot/pc98/boot2/Makefile to use kern.mk and
get rid of bsd.kern.mk completely.

OK'ed by: bde

MFi386: Install the "boot" image which is boot1 + boot2.

Remove '-DUFS1_ONLY' from CFLAGS. It is not needed.

Move the definition of UFS1_ONLY into the Makefiles where it belongs.

Sponsored by: DARPA & NAI Labs.

Added some header files from -stable and fixed the boot[12] programs.

Drop support for COPY, -c has been the default mode of install(1)
for a long time now.

Approved by: bde

Cosmetic change (align with other boot blocks):

CONSPEED -> COMSPEED

Approved by: nyan

Fixed to build for GCC 3.1

-ffreestanding is the word.
(also resort some CFLAGS such that the more "important" value are first so
they are easier to see)

Add -D_KERNEL to CFLAGS for ntohl().

Update boot[12] program to compile ELF binary.

Submitted by: Nobuyuki Koganemaru <n-kogane@syd.odn.ne.jp> and
kawanobe@st.rim.or.jp (Kawanobe Koh)

Remove -mno-486 option and add -mpreferred-stack-boundary=2 option.

$Id$ -> $FreeBSD$

Optimize better for space.

Submitted by: Takahashi Yoshihiro <nyan@wyvern.cc.kogakuin.ac.jp>

PC98 version of new boot loader. Because boot2 has not yet ported,
files in boot2 directory are copies from legacy biosboot.

Submitted by: IMAI Takeshi <take-i@ceres.dti.ne.jp>