linux: adjust ordering of Linux auxv and add dummy AT_HWCAP2

This should be a no-op; the purpose of this is to reduce
a spurious difference between Linuxulator and Linux, to make
debugging core dump

linux: adjust ordering of Linux auxv and add dummy AT_HWCAP2

This should be a no-op; the purpose of this is to reduce
a spurious difference between Linuxulator and Linux, to make
debugging core dumps slightly easier.

Note that AT_HWCAP2 we pass to Linux binaries is always 0,
instead of being equal to 'cpu_feature2'. This matches what
I've observed under Ubuntu Focal VM.

Reviewed By: chuck, dchagin
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D29609

(cherry picked from commit ca6e1fa3ce87f56847633530cb94a6fb63405680)

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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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amd64: consistently use uprintf() to report weird situations in sigreturn

(cherry picked from commit 2e79a216329f62a78dbbc72256e782353e220968)

amd64: centralize definitions of CS_SECURE and EFL_SECURE

(cherry picked from commit a42d362bb54af91d8b82dca086fa656f4624bae2)

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)

amd64 linux64: use x86_clear_dbregs()

(cherry picked from commit 2f1588474768f61f3a983af207e753bd0340a9e7)

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

Stop calling set_syscall_retval() from linux_set_syscall_retval().
The former clobbers some registers that shouldn't be touched.

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

Stop calling set_syscall_retval() from linux_set_syscall_retval().
The former clobbers some registers that shouldn't be touched.

Reviewed by: kib (earlier version)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26406

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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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amd64 pmap: LA57 AKA 5-level paging

Since LA57 was moved to the main SDM document with revision 072, it
seems that we should have a support for it, and silicons are coming.

This patch makes pmap su

amd64 pmap: LA57 AKA 5-level paging

Since LA57 was moved to the main SDM document with revision 072, it
seems that we should have a support for it, and silicons are coming.

This patch makes pmap support both LA48 and LA57 hardware. The
selection of page table level is done at startup, kernel always
receives control from loader with 4-level paging. It is not clear how
UEFI spec would adapt LA57, for instance it could hand out control in
LA57 mode sometimes.

To switch from LA48 to LA57 requires turning off long mode, requesting
LA57 in CR4, then re-entering long mode. This is somewhat delicate
and done in pmap_bootstrap_la57(). AP startup in LA57 mode is much
easier, we only need to toggle a bit in CR4 and load right value in CR3.

I decided to not change kernel map for now. Single PML5 entry is
created that points to the existing kernel_pml4 (KML4Phys) page, and a
pml5 entry to create our recursive mapping for vtopte()/vtopde().
This decision is motivated by the fact that we cannot overcommit for
KVA, so large space there is unusable until machines start providing
wider physical memory addressing. Another reason is that I do not
want to break our fragile autotuning, so the KVA expansion is not
included into this first step. Nice side effect is that minidumps are
compatible.

On the other hand, (very) large address space is definitely
immediately useful for some userspace applications.

For userspace, numbering of pte entries (or page table pages) is
always done for 5-level structures even if we operate in 4-level mode.
The pmap_is_la57() function is added to report the mode of the
specified pmap, this is done not to allow simultaneous 4-/5-levels
(which is not allowed by hw), but to accomodate for EPT which has
separate level control and in principle might not allow 5-leve EPT
despite x86 paging supports it. Anyway, it does not seems critical to
have 5-level EPT support now.

Tested by: pho (LA48 hardware)
Reviewed by: alc
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D25273

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Handle getcpu() calls in vsyscall emulation on amd64.

linux_getcpu() has been implemented since r356241.

PR: 246339
Submitted by: John Hay <[email protected]>
MFC after: 1 week

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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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

linux: futex_mtx should follow futex_list

Move futex_mtx to linux_common.ko for amd64 and aarch64 along
with respective list/mutex init/destroy.

PR: 240989
Reported by: Alex S <[email protected]>