bsd.own.mk: rename to CC_WNO_ADDRESS_OF_PACKED_MEMBER

Provide a single variable
CC_WNO_ADDRESS_OF_PACKED_MEMBER
with options for both clang and gcc, to replace
CLANG_NO_ADDR_OF_PACKED_MEMBER
CC_NO_ADDR_OF_PACKED_MEMBER
GCC_NO_ADDR_OF_PACKED_MEMBER

Using the convention CC_compilerflag, where compilerflag
is based on the full compiler flag name.

add support for new GCC 9 warnings that may be too much to fix
right now. new address-of-packed-member and format-overflow
warnings have new GCC_NO_ADDR_OF_PACKED_MEMBER amd
GCC_NO_FORMAT_OVERFLOW variables to remove these warnings.

apply to a bunch of the tree. mostly, these are real bugs that
should be fixed, but in many cases, only by removing the 'packed'
attribute from some structure that doesn't really need it. (i
looked at many different ones, and while perhaps 60-80% were
already properly aligned, it wasn't clear to me that the uses
were always coming from sane data vs network alignment, so it
doesn't seem safe to remove packed without careful research for
each affect struct.) clang already warned (and was not erroring)
for many of these cases, but gcc picked up dozens more.

Specify NOLIBCSANITIZER in x86 bootloader-like code under sys/arch/

Set NOLIBCSANITIZER for i386 and amd64 specific bootloader-like code.

branches: 1.50.2;
- Disable MKSANITIZER
- Redo using NOPIE
- Add NORELRO

branches: 1.49.16;
${PROG} depends on ${LDSCRIPT}.

branches: 1.48.6;
Reduce amount of -no-integrated-as on x86 as .code16 is now supported by
LLVM.

Add empty LIBCRTI= as LIBCRT0 to build sa programs without installed DESTDIR.

XXX: probabry we should have bsd.saprog.mk or something.

provide an ldscript to strip the unwind sections
XXX: untested

Add a missing KLINK_MACHINE= i386

Use <bsd.klinks.mk>

branches: 1.43.2; 1.43.4;
Don't depend on HAVE_GCC being always present.

branches: 1.42.2;
remove all the code that supported HAVE_GCC=3. mostly from chuq.

Refactor compiler-specific optimizer flags. Mark bootxx as supported
with clang.

branches: 1.40.2;
Disable integrated assembler for files that use .code16 or .code32 for
now. Disable Clang completely for bootxx and netboot for now until the
size issue has been sorted out.

branches: 1.39.2;
Introduce .WAIT into the cleandir rule for blasting the libsa/libkern/etc.
trees, because it can race with the libsa/libkern/etc. makefiles' own
cleandir rules. I think I've found all of the uses of the offending idiom...
Closes PR 43360.

branches: 1.38.2; 1.38.4;
Move relocation address to lower memory (0x1000) further away from the
BIOS 40:0 segment than previously but giving more room for heap that 0x8800.

Change relay address for mbr and bootxx code to be 0x8800.
I'm not sure why I used 0x600, but I have a feeling that might
sometimes corrupt bios data.
0x8800 is far enough above 0x7e00 for a sector read to the latter address.

Remove obsolete LIBSA_USE_MEMCPY and LIBSA_USE_MEMSET.
They were removed from <lib/libsa/stand.h> on December 2007.

Remove extra trailing slash in ${S} path.

Prefer MACHINE_ARCH to MACHINE in some tests

branches: 1.33.2; 1.33.8;
disable PIE for boot code.

Wrap compiler-specific flags with HAVE_GCC and HAVE_PCC as necessary. Add a few flags for PCC.

branches: 1.31.4; 1.31.6; 1.31.10;
Add -momit-leaf-frame-pointer, saves a few bytes.

branches: 1.30.2; 1.30.6;
Add EPIA_HACK so that boot loaders work on EDEN 5000 processors.
This worked in NetBSD 3, but broke by NetBSD 4.

My offer of a development machine to fix this one and for all is still open!

branches: 1.29.2;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Remove -DBOOT_ELF64 to make build on amd64.

branches: 1.27.6; 1.27.14; 1.27.22; 1.27.24; 1.27.26;
Don't define UNALIGNED_ACCESS, it's not used anymore.

Add -DUNALIGNED_ACCESS here, libsa/dosfs.c seems to need it.
Probably it ought to come from some generic .h file, but I've no idea
which - nor if any existing define has the same effect.
In any case this saves oodles of bytes in bootxx_msdos.

branches: 1.25.2; 1.25.4;
nuke $DBG, since it contains -O2; suggested by uwe.

branches: 1.24.4; 1.24.6;
Use ${TOOL_STAT} to get the size, instead of ls | tr | cut.

Use -Wl,-Ttext,foo instead of -Ttext foo when using $(CC)

branches: 1.22.4;
Convert to using CC instead of LD, as LDFLAGS is for CC not LD.

support MAKEVERBOSE

- -mcpu=i386 is gone in GCC4
- we need -Wno-attributes (to avoid __packed__ warnings)
- use -Wno-pointer-sign
- remove some redundancy from pxeboot/Makefile

branches: 1.19.4; 1.19.6; 1.19.8; 1.19.12;
merge ktrace-lwp.

use a .BEGIN target to make the various symlinks,
the previous way had problems with parallel make.

branches: 1.17.2;
add dependall and realdepend to the targets that we need to call in the
beginning. XXX: The real fix (handle dependencies in .BEGIN) is forthcoming.

More .BEGIN lossage.

branches: 1.15.10;
More complete fix for overriding CPUFLAGS and also apply fix to bootxx,
from Valeriy Ushakov.

Ignore errors on some rm -rf's for platforms that aren't quite
POSIX compliant
and return errors on r/o source (FreeBSD) for -rf. Fixes PR#25022

branches: 1.13.2;
If a bootxx program already happened to be a multiple of 512 bytes in
length before padding, the shell command to conditionally pad it to
a multiple of 512 bytes returned a nonzero exit status, causing the
build to fail.

Instead of defining TERSE_ERROR by default (due to space constraints),
define NO_LBA_CHECK. bootxx_msdos still needs TERSE_ERROR because its
BPB is larger than the default.

Pick up X86_BOOT_MAGIC_* from bootblock.h
Move boot_params.S to lib (seems useful to use it in pxeboot).

Change the way the shared lib directory is handled.
Should now work if ${.OBJDIR} = ${.CURDIR}/obj.

Overhaul MBR handling (part 1):

<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.

As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.

<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).

amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.

* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).

* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.

* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.

* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.

* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.

installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)

mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.


Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).

Add -DBOOT_ELF64 for amd64.

Add -m elf_i386 to ${LD}, not ${LDFLAGS}, since bsd.lib.mk doesn't
include ${LDFLAGS} when using ld -x on an object file.

XXX what's the point of these ld -x rules anyway?

Report actual $MACHINE (so it will be amd64, not i386)
and filesystem type (could be useful)
in primary bootstrap banner message.

branches: 1.5.2;
Make this work without a populated destdir:
machine and x86 symlinks.
Include from right places.
Don't depend on LIBCRT0,etc.

Also for the bootxx programs, keep the ELF object during the build
process.

Install into /usr/mdec

x86_64 -> amd64

Uncomment line that deletes tempory file

bootxx: bootstrap code - installable by MI installboot.
Loads /boot using filesystem accesses (rather than a list of block numbers)

add support for new GCC 9 warnings that may be too much to fix
right now. new address-of-packed-member and format-overflow
warnings have new GCC_NO_ADDR_OF_PACKED_MEMBER amd
GCC_NO_FORMAT_OVERFLOW variables to remove these warnings.

apply to a bunch of the tree. mostly, these are real bugs that
should be fixed, but in many cases, only by removing the 'packed'
attribute from some structure that doesn't really need it. (i
looked at many different ones, and while perhaps 60-80% were
already properly aligned, it wasn't clear to me that the uses
were always coming from sane data vs network alignment, so it
doesn't seem safe to remove packed without careful research for
each affect struct.) clang already warned (and was not erroring)
for many of these cases, but gcc picked up dozens more.

Specify NOLIBCSANITIZER in x86 bootloader-like code under sys/arch/

Set NOLIBCSANITIZER for i386 and amd64 specific bootloader-like code.

branches: 1.50.2;
- Disable MKSANITIZER
- Redo using NOPIE
- Add NORELRO

branches: 1.49.16;
${PROG} depends on ${LDSCRIPT}.

branches: 1.48.6;
Reduce amount of -no-integrated-as on x86 as .code16 is now supported by
LLVM.

Add empty LIBCRTI= as LIBCRT0 to build sa programs without installed DESTDIR.

XXX: probabry we should have bsd.saprog.mk or something.

provide an ldscript to strip the unwind sections
XXX: untested

Add a missing KLINK_MACHINE= i386

Use <bsd.klinks.mk>

branches: 1.43.2; 1.43.4;
Don't depend on HAVE_GCC being always present.

branches: 1.42.2;
remove all the code that supported HAVE_GCC=3. mostly from chuq.

Refactor compiler-specific optimizer flags. Mark bootxx as supported
with clang.

branches: 1.40.2;
Disable integrated assembler for files that use .code16 or .code32 for
now. Disable Clang completely for bootxx and netboot for now until the
size issue has been sorted out.

branches: 1.39.2;
Introduce .WAIT into the cleandir rule for blasting the libsa/libkern/etc.
trees, because it can race with the libsa/libkern/etc. makefiles' own
cleandir rules. I think I've found all of the uses of the offending idiom...
Closes PR 43360.

branches: 1.38.2; 1.38.4;
Move relocation address to lower memory (0x1000) further away from the
BIOS 40:0 segment than previously but giving more room for heap that 0x8800.

Change relay address for mbr and bootxx code to be 0x8800.
I'm not sure why I used 0x600, but I have a feeling that might
sometimes corrupt bios data.
0x8800 is far enough above 0x7e00 for a sector read to the latter address.

Remove obsolete LIBSA_USE_MEMCPY and LIBSA_USE_MEMSET.
They were removed from <lib/libsa/stand.h> on December 2007.

Remove extra trailing slash in ${S} path.

Prefer MACHINE_ARCH to MACHINE in some tests

branches: 1.33.2; 1.33.8;
disable PIE for boot code.

Wrap compiler-specific flags with HAVE_GCC and HAVE_PCC as necessary. Add a few flags for PCC.

branches: 1.31.4; 1.31.6; 1.31.10;
Add -momit-leaf-frame-pointer, saves a few bytes.

branches: 1.30.2; 1.30.6;
Add EPIA_HACK so that boot loaders work on EDEN 5000 processors.
This worked in NetBSD 3, but broke by NetBSD 4.

My offer of a development machine to fix this one and for all is still open!

branches: 1.29.2;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Remove -DBOOT_ELF64 to make build on amd64.

branches: 1.27.6; 1.27.14; 1.27.22; 1.27.24; 1.27.26;
Don't define UNALIGNED_ACCESS, it's not used anymore.

Add -DUNALIGNED_ACCESS here, libsa/dosfs.c seems to need it.
Probably it ought to come from some generic .h file, but I've no idea
which - nor if any existing define has the same effect.
In any case this saves oodles of bytes in bootxx_msdos.

branches: 1.25.2; 1.25.4;
nuke $DBG, since it contains -O2; suggested by uwe.

branches: 1.24.4; 1.24.6;
Use ${TOOL_STAT} to get the size, instead of ls | tr | cut.

Use -Wl,-Ttext,foo instead of -Ttext foo when using $(CC)

branches: 1.22.4;
Convert to using CC instead of LD, as LDFLAGS is for CC not LD.

support MAKEVERBOSE

- -mcpu=i386 is gone in GCC4
- we need -Wno-attributes (to avoid __packed__ warnings)
- use -Wno-pointer-sign
- remove some redundancy from pxeboot/Makefile

branches: 1.19.4; 1.19.6; 1.19.8; 1.19.12;
merge ktrace-lwp.

use a .BEGIN target to make the various symlinks,
the previous way had problems with parallel make.

branches: 1.17.2;
add dependall and realdepend to the targets that we need to call in the
beginning. XXX: The real fix (handle dependencies in .BEGIN) is forthcoming.

More .BEGIN lossage.

branches: 1.15.10;
More complete fix for overriding CPUFLAGS and also apply fix to bootxx,
from Valeriy Ushakov.

Ignore errors on some rm -rf's for platforms that aren't quite
POSIX compliant
and return errors on r/o source (FreeBSD) for -rf. Fixes PR#25022

branches: 1.13.2;
If a bootxx program already happened to be a multiple of 512 bytes in
length before padding, the shell command to conditionally pad it to
a multiple of 512 bytes returned a nonzero exit status, causing the
build to fail.

Instead of defining TERSE_ERROR by default (due to space constraints),
define NO_LBA_CHECK. bootxx_msdos still needs TERSE_ERROR because its
BPB is larger than the default.

Pick up X86_BOOT_MAGIC_* from bootblock.h
Move boot_params.S to lib (seems useful to use it in pxeboot).

Change the way the shared lib directory is handled.
Should now work if ${.OBJDIR} = ${.CURDIR}/obj.

Overhaul MBR handling (part 1):

<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.

As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.

<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).

amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.

* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).

* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.

* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.

* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.

* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.

installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)

mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.


Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).

Add -DBOOT_ELF64 for amd64.

Add -m elf_i386 to ${LD}, not ${LDFLAGS}, since bsd.lib.mk doesn't
include ${LDFLAGS} when using ld -x on an object file.

XXX what's the point of these ld -x rules anyway?

Report actual $MACHINE (so it will be amd64, not i386)
and filesystem type (could be useful)
in primary bootstrap banner message.

branches: 1.5.2;
Make this work without a populated destdir:
machine and x86 symlinks.
Include from right places.
Don't depend on LIBCRT0,etc.

Also for the bootxx programs, keep the ELF object during the build
process.

Install into /usr/mdec

x86_64 -> amd64

Uncomment line that deletes tempory file

bootxx: bootstrap code - installable by MI installboot.
Loads /boot using filesystem accesses (rather than a list of block numbers)

Specify NOLIBCSANITIZER in x86 bootloader-like code under sys/arch/

Set NOLIBCSANITIZER for i386 and amd64 specific bootloader-like code.

- Disable MKSANITIZER
- Redo using NOPIE
- Add NORELRO

branches: 1.49.16;
${PROG} depends on ${LDSCRIPT}.

branches: 1.48.6;
Reduce amount of -no-integrated-as on x86 as .code16 is now supported by
LLVM.

Add empty LIBCRTI= as LIBCRT0 to build sa programs without installed DESTDIR.

XXX: probabry we should have bsd.saprog.mk or something.

provide an ldscript to strip the unwind sections
XXX: untested

Add a missing KLINK_MACHINE= i386

Use <bsd.klinks.mk>

branches: 1.43.2; 1.43.4;
Don't depend on HAVE_GCC being always present.

branches: 1.42.2;
remove all the code that supported HAVE_GCC=3. mostly from chuq.

Refactor compiler-specific optimizer flags. Mark bootxx as supported
with clang.

branches: 1.40.2;
Disable integrated assembler for files that use .code16 or .code32 for
now. Disable Clang completely for bootxx and netboot for now until the
size issue has been sorted out.

branches: 1.39.2;
Introduce .WAIT into the cleandir rule for blasting the libsa/libkern/etc.
trees, because it can race with the libsa/libkern/etc. makefiles' own
cleandir rules. I think I've found all of the uses of the offending idiom...
Closes PR 43360.

branches: 1.38.2; 1.38.4;
Move relocation address to lower memory (0x1000) further away from the
BIOS 40:0 segment than previously but giving more room for heap that 0x8800.

Change relay address for mbr and bootxx code to be 0x8800.
I'm not sure why I used 0x600, but I have a feeling that might
sometimes corrupt bios data.
0x8800 is far enough above 0x7e00 for a sector read to the latter address.

Remove obsolete LIBSA_USE_MEMCPY and LIBSA_USE_MEMSET.
They were removed from <lib/libsa/stand.h> on December 2007.

Remove extra trailing slash in ${S} path.

Prefer MACHINE_ARCH to MACHINE in some tests

branches: 1.33.2; 1.33.8;
disable PIE for boot code.

Wrap compiler-specific flags with HAVE_GCC and HAVE_PCC as necessary. Add a few flags for PCC.

branches: 1.31.4; 1.31.6; 1.31.10;
Add -momit-leaf-frame-pointer, saves a few bytes.

branches: 1.30.2; 1.30.6;
Add EPIA_HACK so that boot loaders work on EDEN 5000 processors.
This worked in NetBSD 3, but broke by NetBSD 4.

My offer of a development machine to fix this one and for all is still open!

branches: 1.29.2;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Remove -DBOOT_ELF64 to make build on amd64.

branches: 1.27.6; 1.27.14; 1.27.22; 1.27.24; 1.27.26;
Don't define UNALIGNED_ACCESS, it's not used anymore.

Add -DUNALIGNED_ACCESS here, libsa/dosfs.c seems to need it.
Probably it ought to come from some generic .h file, but I've no idea
which - nor if any existing define has the same effect.
In any case this saves oodles of bytes in bootxx_msdos.

branches: 1.25.2; 1.25.4;
nuke $DBG, since it contains -O2; suggested by uwe.

branches: 1.24.4; 1.24.6;
Use ${TOOL_STAT} to get the size, instead of ls | tr | cut.

Use -Wl,-Ttext,foo instead of -Ttext foo when using $(CC)

branches: 1.22.4;
Convert to using CC instead of LD, as LDFLAGS is for CC not LD.

support MAKEVERBOSE

- -mcpu=i386 is gone in GCC4
- we need -Wno-attributes (to avoid __packed__ warnings)
- use -Wno-pointer-sign
- remove some redundancy from pxeboot/Makefile

branches: 1.19.4; 1.19.6; 1.19.8; 1.19.12;
merge ktrace-lwp.

use a .BEGIN target to make the various symlinks,
the previous way had problems with parallel make.

branches: 1.17.2;
add dependall and realdepend to the targets that we need to call in the
beginning. XXX: The real fix (handle dependencies in .BEGIN) is forthcoming.

More .BEGIN lossage.

branches: 1.15.10;
More complete fix for overriding CPUFLAGS and also apply fix to bootxx,
from Valeriy Ushakov.

Ignore errors on some rm -rf's for platforms that aren't quite
POSIX compliant
and return errors on r/o source (FreeBSD) for -rf. Fixes PR#25022

branches: 1.13.2;
If a bootxx program already happened to be a multiple of 512 bytes in
length before padding, the shell command to conditionally pad it to
a multiple of 512 bytes returned a nonzero exit status, causing the
build to fail.

Instead of defining TERSE_ERROR by default (due to space constraints),
define NO_LBA_CHECK. bootxx_msdos still needs TERSE_ERROR because its
BPB is larger than the default.

Pick up X86_BOOT_MAGIC_* from bootblock.h
Move boot_params.S to lib (seems useful to use it in pxeboot).

Change the way the shared lib directory is handled.
Should now work if ${.OBJDIR} = ${.CURDIR}/obj.

Overhaul MBR handling (part 1):

<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.

As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.

<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).

amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.

* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).

* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.

* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.

* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.

* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.

installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)

mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.


Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).

Add -DBOOT_ELF64 for amd64.

Add -m elf_i386 to ${LD}, not ${LDFLAGS}, since bsd.lib.mk doesn't
include ${LDFLAGS} when using ld -x on an object file.

XXX what's the point of these ld -x rules anyway?

Report actual $MACHINE (so it will be amd64, not i386)
and filesystem type (could be useful)
in primary bootstrap banner message.

branches: 1.5.2;
Make this work without a populated destdir:
machine and x86 symlinks.
Include from right places.
Don't depend on LIBCRT0,etc.

Also for the bootxx programs, keep the ELF object during the build
process.

Install into /usr/mdec

x86_64 -> amd64

Uncomment line that deletes tempory file

bootxx: bootstrap code - installable by MI installboot.
Loads /boot using filesystem accesses (rather than a list of block numbers)