sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

amd64 ia32 vdso: always define some __vdso_ symbols

... regardless of the kernel config options.
It is reported that llvm16 ld.lld warns about undefined symbols
referenced by the VERSION script.

Re

amd64 ia32 vdso: always define some __vdso_ symbols

... regardless of the kernel config options.
It is reported that llvm16 ld.lld warns about undefined symbols
referenced by the VERSION script.

Reviewed by: emaste, val_packett.cool
Discussed with: jrtc27
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D38392

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amd64 ia32 vdso: add unwind annotations to the signal trampoline

Reviewed by: emaste
Discussed with: jhb, jrtc27
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 month
Differential

amd64 ia32 vdso: add unwind annotations to the signal trampoline

Reviewed by: emaste
Discussed with: jhb, jrtc27
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 month
Differential revision: https://reviews.freebsd.org/D32960

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vdso for ia32 on amd64

Reviewed by: emaste
Discussed with: jrtc27
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 month
Differential revision: https://reviews.freebsd.org/D32960

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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Improve the lcall $7,$0 syscall emulation on amd64.

Current code, which copies the potential syscall arguments into the
current frame, puts an arbitrary limit on the number of syscall
arguments. Ap

Improve the lcall $7,$0 syscall emulation on amd64.

Current code, which copies the potential syscall arguments into the
current frame, puts an arbitrary limit on the number of syscall
arguments. Apparently, mmap(2) and lseek(2) (?) require larger
number. But there is an issue that stack is only need to be mapped to
contain the number of arguments required by the syscall, so copying
arbitrary large number of words from the stack is not completely safe.

Use different approach to convert lcall frame into int $0x80 frame in
place, by doing the retl in kernel. This also allows to stop proceed
vfork case specially, and stop making assumptions about %cs at the
syscall time.

Also, improve comments with the formulations provided by bde.

Reviewed and tested by: bde
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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Merge sync of head

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

MFhead @ r276594

Merge ^/head r274961 through r276342.

Change the way the lcall $7,$0 is reflected to usermode. Instead of
setting call gate, which must be 64 bit, put a code segment descriptor
into ldt slot 0.

This way, syscall shim does not switch te

Change the way the lcall $7,$0 is reflected to usermode. Instead of
setting call gate, which must be 64 bit, put a code segment descriptor
into ldt slot 0.

This way, syscall shim does not switch temporary to 64bit trampoline,
and does not create a window where signal delivery interrupts 64 bit
mode (signal handler cannot return). The cost is shim running with
non-zero based segment in %cs, which requires vfork() handling make
more assumptions.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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MFC @ r241285

IFC @ r242684

Sync from head

Merge head r233826 through r240095.

Real hardware, as opposed to QEMU, does not allow to have a call gate
in long mode which transfers control to 32bit code segment. Unbreak
the lcall $7,$0 implementation on amd64 by putting the 64bit

Real hardware, as opposed to QEMU, does not allow to have a call gate
in long mode which transfers control to 32bit code segment. Unbreak
the lcall $7,$0 implementation on amd64 by putting the 64bit user code
segment' selector into call gate, and execute the 64bit trampoline
which converts the return frame into 32bit format and switches back to
32bit mode for executing int $0x80 trampoline.

Note that all jumps over the hoops are performed in the user mode.

MFC after: 1 week

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Integrate from Head into ZFSD feature branch as of revision r224141.

IFC @ r222830

MFC

Fix vfork. Add comments.

Add support for executing the FreeBSD 1/i386 a.out binaries on amd64.

In particular:
- implement compat shims for old stat(2) variants and ogetdirentries(2);
- implement delivery of signals with anc

Add support for executing the FreeBSD 1/i386 a.out binaries on amd64.

In particular:
- implement compat shims for old stat(2) variants and ogetdirentries(2);
- implement delivery of signals with ancient stack frame layout and
corresponding sigreturn(2);
- implement old getpagesize(2);
- provide a user-mode trampoline and LDT call gate for lcall $7,$0;
- port a.out image activator and connect it to the build as a module
on amd64.

The changes are hidden under COMPAT_43.

MFC after: 1 month

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Merge from head

Merge from head up to r188941 (last revision before the USB stack switch)

- Merge from HEAD