Fix some modules to export more used symbols

(cherry picked from commit 5bb3134a8c21cb87b30e135ef168483f0333dabb)

Fix i386 linux module after r367395.

In r367395 parts of machine dependent linux_dummy.c were moved to a new
machine independent file sys/compat/linux/linux_dummy.c and the existing
linux_dummy.c wa

Fix i386 linux module after r367395.

In r367395 parts of machine dependent linux_dummy.c were moved to a new
machine independent file sys/compat/linux/linux_dummy.c and the existing
linux_dummy.c was renamed to linux_dummy_machdep.c.

Add linux_dummy_machdep.c to the linux module for i386.
Rename sys/amd64/linux32/linux_dummy.c for consistency.
Add the new linux_dummy.c to the linux module for i386.

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linux(4): Deduplicate unimpl/dummy syscall handlers

No functional change.

Reviewed by: emaste, trasz
Differential Revision: https://reviews.freebsd.org/D27099

Pass -fuse-ld=/path/to/ld if ${LD} != "ld"

This is needed so that setting LD/XLD is not ignored when linking with $CC
instead of directly using $LD. Currently only clang accepts an absolute
path for

Pass -fuse-ld=/path/to/ld if ${LD} != "ld"

This is needed so that setting LD/XLD is not ignored when linking with $CC
instead of directly using $LD. Currently only clang accepts an absolute
path for -fuse-ld= (Clang 12+ will add a new --ld-path flag), so we now
warn when building with GCC and $LD != "ld" since that might result in the
wrong linker being used.

We have been setting XLD=/path/to/cheri/ld.lld in CheriBSD for a long time and
used a similar version of this patch to avoid linking with /usr/bin/ld.
This change is also required when building FreeBSD on an Ubuntu with Clang:
In that case we set XCC=/usr/lib/llvm-10/bin/clang and since
/usr/lib/llvm-10/bin/ does not contain a "ld" binary the build fails with
`clang: error: unable to execute command: Executable "ld" doesn't exist!`
unless we pass -fuse-ld=/usr/lib/llvm-10/bin/ld.lld.

This change passes -fuse-ld instead of copying ${XLD} to WOLRDTMP/bin/ld
since then we would have to ensure that this file does not exist while
building the bootstrap tools. The cross-linker might not be compatible with
the host linker (e.g. when building on macos: host-linker= Mach-O /usr/bin/ld,
cross-linker=LLVM ld.lld).

Reviewed By: brooks, emaste
Differential Revision: https://reviews.freebsd.org/D26055

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Allow overriding the tool used for stripping binaries

Since the make variable STRIP is already used for other purposes, this
uses STRIPBIN (which is also used for the same purpose by install(1).
Thi

Allow overriding the tool used for stripping binaries

Since the make variable STRIP is already used for other purposes, this
uses STRIPBIN (which is also used for the same purpose by install(1).
This allows using LLVM objcopy to strip binaries instead of the in-tree
elftoolchain objcopy. We make use of this in CheriBSD since passing
binaries generated by our toolchain to elftoolchain strip sometimes results
in assertion failures.

This allows working around https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248516
by specifying STRIPBIN=/path/to/llvm-strip

Obtained from: CheriBSD
Reviewed By: emaste, brooks
Differential Revision: https://reviews.freebsd.org/D25988

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More fixes to build the kernel with a compiler that defaults to -fno-common

Using the same approach as the last commit for the files used by genassym.sh.

Obtained from: CheriBSD

Replace -Werror with ${WERROR} in module builds

Add warning to the Linuxulator makefiles that building it outside of a
kernel does not make sence.

PR: 222861
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D20179

Linuxulator depends on a fundamental kernel settings such as SMP. Many
of them listed in opt_global.h which is not generated while building
modules outside of a kernel and such modules never match re

Linuxulator depends on a fundamental kernel settings such as SMP. Many
of them listed in opt_global.h which is not generated while building
modules outside of a kernel and such modules never match real cofigured
kernel.

So, we should prevent our users from building obviously defective modules.

Therefore, remove the root cause of the building of modules outside of a
kernel - the possibility of building modules with DEBUG or KTR flags.
And remove all of DEBUG printfs as it is incomplete and in threaded
programms not informative, also a half of system call does not have DEBUG
printf. For debuging Linux programms we have dtrace, ktr and ktrace ability.

PR: 222861
Reviewed by: trasz
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D20178

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The build process generates assym.inc from genassym.o, so don't forget
to clean genassym.o

MFC after: 2 weeks

All genassym.sh usage need offset.inc

Fix futexes on i386 after the 4/4G split.

Use proper method to access userspace. For now, only the slow copyout
path is implemented.

Reported and tested by: tijl (previous version)
Sponsored by: T

Fix futexes on i386 after the 4/4G split.

Use proper method to access userspace. For now, only the slow copyout
path is implemented.

Reported and tested by: tijl (previous version)
Sponsored by: The FreeBSD Foundation

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Move most of the contents of opt_compat.h to opt_global.h.

opt_compat.h is mentioned in nearly 180 files. In-progress network
driver compabibility improvements may add over 100 more so this is
close

Move most of the contents of opt_compat.h to opt_global.h.

opt_compat.h is mentioned in nearly 180 files. In-progress network
driver compabibility improvements may add over 100 more so this is
closer to "just about everywhere" than "only some files" per the
guidance in sys/conf/options.

Keep COMPAT_LINUX32 in opt_compat.h as it is confined to a subset of
sys/compat/linux/*.c. A fake _COMPAT_LINUX option ensure opt_compat.h
is created on all architectures.

Move COMPAT_LINUXKPI to opt_dontuse.h as it is only used to control the
set of compiled files.

Reviewed by: kib, cem, jhb, jtl
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D14941

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Rename assym.s to assym.inc

assym is only to be included by other .s files, and should never
actually be assembled by itself.

Reviewed by: imp, bdrewery (earlier)
Sponsored by: The FreeBSD Foundati

Rename assym.s to assym.inc

assym is only to be included by other .s files, and should never
actually be assembled by itself.

Reviewed by: imp, bdrewery (earlier)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D14180

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Share a single bsd-linux errno table across MD consumers

Three copies of the linuxulator linux_sysvec.c contained identical
BSD to Linux errno translation tables, and future work to support other
ar

Share a single bsd-linux errno table across MD consumers

Three copies of the linuxulator linux_sysvec.c contained identical
BSD to Linux errno translation tables, and future work to support other
architectures will also use the same table. Move the table to a common
file to be used by all. Make it 'const int' to place it in .rodata.

(Some existing Linux architectures use MD errno values, but x86 and Arm
share the generic set.)

This change should introduce no functional change; a followup will add
missing errno values.

MFC after: 3 weeks
Sponsored by: Turing Robotic Industries Inc.
Differential Revision: https://reviews.freebsd.org/D14665

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Move assym.s to DPSRCS in linux modules

assym.s exists only to be included by other .s files, and should not
actually be assembled by itself.

Sponsored by: Turing Robotic Industries Inc.

Revert r319053 due to lack of sence. As pointed out by kib@ opt_global.h
contains such fundamental settings as e.g. SMP option and fake
opt_global.h almost never match real configured kernels.

Repor

Revert r319053 due to lack of sence. As pointed out by kib@ opt_global.h
contains such fundamental settings as e.g. SMP option and fake
opt_global.h almost never match real configured kernels.

Reported by: kib@

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On success, getrandom() Linux system call returns the number of bytes that
were copied to the buffer supplied by the user.

Also fix getrandom() if Linuxulator modules are built without the kernel.

On success, getrandom() Linux system call returns the number of bytes that
were copied to the buffer supplied by the user.

Also fix getrandom() if Linuxulator modules are built without the kernel.

PR: 219464
Submitted by: Maciej Pasternacki
Reported by: Maciej Pasternacki
MFC after: 1 week

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Strip _binary_linux_locore_o_size from ${VDSO}.so as it is a low absolute
symbol, and this breaks symbol lookup in ddb.

Requested by: bde@

MFC after: 1 week

sys/modules: normalize .CURDIR-relative paths to SRCTOP

This simplifies make output/logic

Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
MFC after: 1 month
Sponsored by: Dell EMC Isilon

Exclude -flto when building *genassym.o

The build process generates *assym.h using nm from *genassym.o (which is
in turn created from *genassym.c).

When compiling with link-time optimization (LTO)

Exclude -flto when building *genassym.o

The build process generates *assym.h using nm from *genassym.o (which is
in turn created from *genassym.c).

When compiling with link-time optimization (LTO) using -flto, .o files
are LLVM bitcode, not ELF objects. This is not usable by genassym.sh,
so remove -flto from those ${CC} invocations.

Submitted by: George Rimar
Reviewed by: dim
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D9659

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Fix a copy/paste bug introduced during X86_64 Linuxulator work.
FreeBSD support NX bit on X86_64 processors out of the box, for i386 emulation
use READ_IMPLIES_EXEC flag, introduced in r302515.

Whil

Fix a copy/paste bug introduced during X86_64 Linuxulator work.
FreeBSD support NX bit on X86_64 processors out of the box, for i386 emulation
use READ_IMPLIES_EXEC flag, introduced in r302515.

While here move common part of mmap() and mprotect() code to the files in compat/linux
to reduce code dupcliation between Linuxulator's.

Reported by: Johannes Jost Meixner, Shawn Webb

MFC after: 1 week
XMFC with: r302515, r302516

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pass -fPIC to the assembler, not linker

-fPIC has no effect on linking although it seems to be ignored by
GNU ld.bfd. However, it causes ld.lld to terminate with an invalid
argument error.

Reviewe

pass -fPIC to the assembler, not linker

-fPIC has no effect on linking although it seems to be ignored by
GNU ld.bfd. However, it causes ld.lld to terminate with an invalid
argument error.

Reviewed by: dchagin, kib
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D5444

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For objcopy, use --input-target and --output-target

When building with gcc 4.9 and binutils 2.25,
using '--input' and '--output' returns an error
message:
objcopy: option `--input' is ambiguous

For objcopy, use --input-target and --output-target

When building with gcc 4.9 and binutils 2.25,
using '--input' and '--output' returns an error
message:
objcopy: option `--input' is ambiguous

Reported by: Jenkins

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Rework signal code to allow using it by other modules, like linprocfs:

1. Linux sigset always 64 bit on all platforms. In order to move Linux
sigset code to the linux_common module define it as 64 b

Rework signal code to allow using it by other modules, like linprocfs:

1. Linux sigset always 64 bit on all platforms. In order to move Linux
sigset code to the linux_common module define it as 64 bit int. Move
Linux sigset manipulation routines to the MI path.

2. Move Linux signal number definitions to the MI path. In general, they
are the same on all platforms except for a few signals.

3. Map Linux RT signals to the FreeBSD RT signals and hide signal conversion
tables to avoid conversion errors.

4. Emulate Linux SIGPWR signal via FreeBSD SIGRTMIN signal which is outside
of allowed on Linux signal numbers.

PR: 197216

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