linux(4): remove unfinished vsyscall bits on arm64

The vsyscall mechanism is obsolete.

Reviewed By: dchagin, emaste
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D31091

(c

linux(4): remove unfinished vsyscall bits on arm64

The vsyscall mechanism is obsolete.

Reviewed By: dchagin, emaste
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D31091

(cherry picked from commit 84a3963d5d94be05c913d04ea0cef4ac69a8bfc7)

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linux: export AT_HWCAP and AT_HWCAP2 on aarch64

The flag values seem to be the same between Linux and FreeBSD.
Comparing to a Linux VM on the same hardware, we're missing
HWCAP_EVTSTRM, HWCAP_CPUID,

linux: export AT_HWCAP and AT_HWCAP2 on aarch64

The flag values seem to be the same between Linux and FreeBSD.
Comparing to a Linux VM on the same hardware, we're missing
HWCAP_EVTSTRM, HWCAP_CPUID, HWCAP_DCPOP, HWCAP_USCAT, HWCAP_PACA,
and HWCAP_PACG.

Reviewed By: mhorne, emaste
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D30540

(cherry picked from commit b501b2ae52f3ccb384584dcbb5dc4a4568cc0096)

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linux: fix architecture returned for uname on aarch64

Previously it would return "arm64", which was breaking build
for Linux kernel. While here, reshuffle entries in the auxv
vector to match real L

linux: fix architecture returned for uname on aarch64

Previously it would return "arm64", which was breaking build
for Linux kernel. While here, reshuffle entries in the auxv
vector to match real Linux.

Reviewed By: emaste
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D30500

(cherry picked from commit aa462cab60c8957a97f612d36ac0a4dfa501bbbe)

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Fix the build after commit 5fa005e91560785dad5183db080209447afde3c2

Fixes: 5fa005e91560 ("exec: Reimplement stack address randomization")

sysent: Add a sv_psstringssz field to struct sysentvec

The size of the ps_strings structure varies between ABIs, so this is
useful for computing the address of the ps_strings structure relative to
t

sysent: Add a sv_psstringssz field to struct sysentvec

The size of the ps_strings structure varies between ABIs, so this is
useful for computing the address of the ps_strings structure relative to
the top of the stack when stack address randomization is enabled.

Reviewed by: kib
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 3fc21fdd5f8a4eeb71f43cc6841f59ef1debaf9a)

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exec: Introduce the PROC_PS_STRINGS() macro

Rather than fetching the ps_strings address directly from a process'
sysentvec, use this macro. With stack address randomization the
ps_strings address i

exec: Introduce the PROC_PS_STRINGS() macro

Rather than fetching the ps_strings address directly from a process'
sysentvec, use this macro. With stack address randomization the
ps_strings address is no longer fixed.

Reviewed by: kib
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 706f4a81a81250a326ea25914e7effe1768f1a37)

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exec: Simplify sv_copyout_strings implementations a bit

Simplify control flow around handling of the execpath length and signal
trampoline. Cache the sysentvec pointer in a local variable.

No func

exec: Simplify sv_copyout_strings implementations a bit

Simplify control flow around handling of the execpath length and signal
trampoline. Cache the sysentvec pointer in a local variable.

No functional change intended.

Reviewed by: kib
Sponsored by: The FreeBSD Foundation

(cherry picked from commit f04a096049382637178b54ffb45089f5f9fb3db9)

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Add quirks for Linux ABI signals handling

(cherry picked from commit 870e197d52c1cb8c3ed6d04ddae34dcae57cb657)

linuxolator: Add compat.linux.setid_allowed knob

PR: 21463

(cherry picked from commit 598f6fb49c9ca688029b79de0a44227ab79c608c)

arm64: clear debug registers after execve(2)

This is both intuitive and required, as any previous breakpoint settings
may not be applicable to the new process.

Reported by: arichardson
Reviewed by:

arm64: clear debug registers after execve(2)

This is both intuitive and required, as any previous breakpoint settings
may not be applicable to the new process.

Reported by: arichardson
Reviewed by: kib
Sponsored by: The FreeBSD Foundation

(cherry picked from commit a2a8b582bdc1c8c1f4da3ae727349327f5fc9dd8)

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aarch64: Clear TLS registers during exec().

These are not stored in the trapframe so must be cleared explicitly.

This is similar to one of the MIPS changes in 822d2d6ac94f.

Obtained from: CheriBSD

aarch64: Clear TLS registers during exec().

These are not stored in the trapframe so must be cleared explicitly.

This is similar to one of the MIPS changes in 822d2d6ac94f.

Obtained from: CheriBSD
Sponsored by: DARPA

(cherry picked from commit 0723b409150ae302eb021cbde86a5f77348a1bb4)

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Arch64: Clear VFP state on execve()

I noticed that many of the math-related tests were failing on AArch64.
After a lot of debugging, I noticed that the floating point exception flags
were not being

Arch64: Clear VFP state on execve()

I noticed that many of the math-related tests were failing on AArch64.
After a lot of debugging, I noticed that the floating point exception flags
were not being reset when starting a new process. This change resets the
VFP inside exec_setregs() to ensure no VFP register state is leaked from
parent processes to children.

This commit also moves the clearing of fpcr that was added in 65618fdda0f27
from fork() to execve() since that makes more sense: fork() can retain
current register values, but execve() should result in a well-defined
clean state.

Reviewed By: andrew
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D29060

(cherry picked from commit 953a7d7c61f3b2f5351dfe668510ec782ae282e8)

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linux: Unmap the VDSO page when unloading

linux_shared_page_init() creates an object and grabs and maps a single
page to back the VDSO. When destroying the VDSO object, we failed to
destroy the map

linux: Unmap the VDSO page when unloading

linux_shared_page_init() creates an object and grabs and maps a single
page to back the VDSO. When destroying the VDSO object, we failed to
destroy the mapping and free KVA. Fix this.

Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D28696

(cherry picked from commit 0fc8a796722846d0d676548aa0f5cc660199db73)

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Linuxolator: Replace use of eventhandlers by sysent hooks.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D27309

Fix misnomer - linux_to_bsd_errno() does the exact opposite.

Reported by: arichardson
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26965

Get rid of sa->narg. It serves no purpose; use sa->callp->sy_narg instead.

Reviewed by: kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D26458

Get rid of sv_errtbl and SV_ABI_ERRNO().

Reviewed by: kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D26388

Move SV_ABI_ERRNO translation into linux-specific code, to simplify
the syscall path and declutter it a bit. No functional changes intended.

Reviewed by: kib (earlier version)
MFC after: 2 weeks
Sp

Move SV_ABI_ERRNO translation into linux-specific code, to simplify
the syscall path and declutter it a bit. No functional changes intended.

Reviewed by: kib (earlier version)
MFC after: 2 weeks
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D26378

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Convert canary, execpathp, and pagesizes to pointers.

Use AUXARGS_ENTRY_PTR to export these pointers. This is a followup to
r359987 and r359988.

Reviewed by: jhb
Obtained from: CheriBSD
Sponsored

Convert canary, execpathp, and pagesizes to pointers.

Use AUXARGS_ENTRY_PTR to export these pointers. This is a followup to
r359987 and r359988.

Reviewed by: jhb
Obtained from: CheriBSD
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D24446

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Add compat.linux.emul_path, so it can be set to something other
than "/compat/linux". Useful when you have several compat directories
with different Linux versions and you don't want to clash with f

Add compat.linux.emul_path, so it can be set to something other
than "/compat/linux". Useful when you have several compat directories
with different Linux versions and you don't want to clash with files
installed by linux-c7 packages.

Reviewed by: bcr (manpages)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22574

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Copy out aux args after the argument and environment vectors.

Partially revert r354741 and r354754 and go back to allocating a
fixed-size chunk of stack space for the auxiliary vector. Keep
sv_copy

Copy out aux args after the argument and environment vectors.

Partially revert r354741 and r354754 and go back to allocating a
fixed-size chunk of stack space for the auxiliary vector. Keep
sv_copyout_auxargs but change it to accept the address at the end of
the environment vector as an input stack address and no longer
allocate room on the stack. It is now called at the end of
copyout_strings after the argv and environment vectors have been
copied out.

This should fix a regression in r354754 that broke the stack alignment
for newer Linux amd64 binaries (and probably broke Linux arm64 as
well).

Reviewed by: kib
Tested on: amd64 (native, linux64 (only linux-base-c7), and i386)
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D22695

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Fix arm64 build after r355373

Sponsored by: The FreeBSD Foundation

Use uintptr_t instead of register_t * for the stack base.

- Use ustringp for the location of the argv and environment strings
and allow destp to travel further down the stack for the stackgap
an

Use uintptr_t instead of register_t * for the stack base.

- Use ustringp for the location of the argv and environment strings
and allow destp to travel further down the stack for the stackgap
and auxv regions.
- Update the Linux copyout_strings variants to move destp down the
stack as was done for the native ABIs in r263349.
- Stop allocating a space for a stack gap in the Linux ABIs. This
used to hold translated system call arguments, but hasn't been used
since r159992.

Reviewed by: kib
Tested on: md64 (amd64, i386, linux64), i386 (i386, linux)
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D22501

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Check for errors from copyout() and suword*() in sv_copyout_args/strings.

Reviewed by: brooks, kib
Tested on: amd64 (amd64, i386, linux64), i386 (i386, linux)
Sponsored by: DARPA
Differential Revisi

Check for errors from copyout() and suword*() in sv_copyout_args/strings.

Reviewed by: brooks, kib
Tested on: amd64 (amd64, i386, linux64), i386 (i386, linux)
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D22401

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Use a sv_copyout_auxargs hook in the Linux ELF ABIs.

Reviewed by: emaste
Tested on: amd64 (linux64 only), i386
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D22356