Avoid using [LINUX_]SHAREDPAGE constant directly in the vdso code.
This is needed for https://reviews.freebsd.org/D11780.

Reported by: kib@

MFhead@r320180

Merge ^/head r319973 through 321382.

Merge ^/head r320573 through r320970.

Add support for musl consumers to the Linuxulator.

PR: 213809
Submitted by: Yonas Yanfa
Reported by: Yonas Yanfa
MFC after: 1 week
Relnotes: yes

Merge ^/head r319801 through r320041.

Move struct syscall_args syscall arguments parameters container into
struct thread.

For all architectures, the syscall trap handlers have to allocate the
structure on the stack. The structure takes

Move struct syscall_args syscall arguments parameters container into
struct thread.

For all architectures, the syscall trap handlers have to allocate the
structure on the stack. The structure takes 88 bytes on 64bit arches
which is not negligible. Also, it cannot be easily found by other
code, which e.g. caused duplication of some members of the structure
to struct thread already. The change removes td_dbg_sc_code and
td_dbg_sc_nargs which were directly copied from syscall_args.

The structure is put into the copied on fork part of the struct thread
to make the syscall arguments information correct in the child after
fork.

This move will also allow several more uses shortly.

Reviewed by: jhb (previous version)
Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks
X-Differential revision: https://reviews.freebsd.org/D11080

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MFhead@r313243

Merge ^/head r312624 through r312719.

Apply r210555 to 64 bit linux support:

The interpreter name should no longer be treated as a buffer that can be
overwritten.

PR: 216346
MFC after: 3 days

Cleanup redundant parenthesis from existing howmany()/roundup() macro uses.

X86: use our nitems() macro when it is avaliable through param.h.

No functional change, only trivial cases are done in this sweep,

Discussed in: freebsd-current

MFH

Sponsored by: The FreeBSD Foundation

Add kern.features flags for linux and linux64 modules

kern.features.linux: 1 meaning linux 32 bits binaries are supported
kern.features.linux64: 1 meaning linux 64 bits binaries are supported

The g

Add kern.features flags for linux and linux64 modules

kern.features.linux: 1 meaning linux 32 bits binaries are supported
kern.features.linux64: 1 meaning linux 64 bits binaries are supported

The goal here is to help 3rd party applications (including ports) to determine
if the host do support linux emulation

Reviewed by: dchagin
MFC after: 1 week
Relnotes: yes
Differential Revision: D5830

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MfH @r295202

Expect to see panics in routing code at least now.

MFH

Sponsored by: The FreeBSD Foundation

Merge ^/head r294777 through r294960.

Convert ss_sp in stack_t and sigstack to void *.

POSIX requires these members to be of type void * rather than the
char * inherited from 4BSD. NetBSD and OpenBSD both changed their
fields to void *

Convert ss_sp in stack_t and sigstack to void *.

POSIX requires these members to be of type void * rather than the
char * inherited from 4BSD. NetBSD and OpenBSD both changed their
fields to void * back in 1998. No new build failures were reported
via an exp-run.

PR: 206503 (exp-run)
Reviewed by: kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D5092

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MFH

Sponsored by: The FreeBSD Foundation

Implement AT_SECURE properly.

AT_SECURE auxv entry has been added to the Linux 2.5 kernel to pass a
boolean flag indicating whether secure mode should be enabled. 1 means
that the program has change

Implement AT_SECURE properly.

AT_SECURE auxv entry has been added to the Linux 2.5 kernel to pass a
boolean flag indicating whether secure mode should be enabled. 1 means
that the program has changes its credentials during the execution.
Being exported AT_SECURE used by glibc issetugid() call.

Submitted by: imp, dchagin
Security: FreeBSD-SA-16:10.linux
Security: CVE-2016-1883

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MFH @r294567

MFH

Sponsored by: The FreeBSD Foundation

Merge ^/head r293430 through r293685.

Implement vsyscall hack. Prior to 2.13 glibc uses vsyscall
instead of vdso. An upcoming linux_base-c6 needs it.

Differential Revision: https://reviews.freebsd.org/D1090

Reviewed by: kib, trasz
MFC

Implement vsyscall hack. Prior to 2.13 glibc uses vsyscall
instead of vdso. An upcoming linux_base-c6 needs it.

Differential Revision: https://reviews.freebsd.org/D1090

Reviewed by: kib, trasz
MFC after: 1 week

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MFH r289384-r293170

Sponsored by: The FreeBSD Foundation