libcxxrt: Update to upstream 698997bfde1f

Interesting fixes:

045c52c Mark __cxa_allocate_exception, __cxa_free_exception and
__cxa_init_primary_exception noexcept.
8a2f123 Define _LIBCXXRT_

libcxxrt: Update to upstream 698997bfde1f

Interesting fixes:

045c52c Mark __cxa_allocate_exception, __cxa_free_exception and
__cxa_init_primary_exception noexcept.
8a2f123 Define _LIBCXXRT_NOEXCEPT in cxxabi.h and use it instead of
throw()
9529236 Fix memory corruption in cpp_demangle_read_sname()
8f5c74e Add test cases, fix more bugs, and improve perf
391a3dc Add a simple implementation of __cxa_call_terminate
40e4fa2 mark std::terminate as noreturn and noexcept
5eede09 Print diagnostics in default std::terminate handler

Reviewed by: dim
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D47238

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Tentatively apply https://github.com/libcxxrt/libcxxrt/pull/27

This marks __cxa_allocate_exception, __cxa_free_exception and
__cxa_init_primary_exception noexcept, to ensure compatibility with
libc+

Tentatively apply https://github.com/libcxxrt/libcxxrt/pull/27

This marks __cxa_allocate_exception, __cxa_free_exception and
__cxa_init_primary_exception noexcept, to ensure compatibility with
libc++'s declarations.

PR: 276104
MFC after: 1 month

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Merge libcxxrt master 03c83f5a57be8c5b1a29a68de5638744f17d28ba

Interesting fixes (* were already cherry-picked):
- 03c83f5 add __cxa_init_primary_exception (#23)
* 5d8a158 Fix two bugs in __cxa_end_

Merge libcxxrt master 03c83f5a57be8c5b1a29a68de5638744f17d28ba

Interesting fixes (* were already cherry-picked):
- 03c83f5 add __cxa_init_primary_exception (#23)
* 5d8a158 Fix two bugs in __cxa_end_cleanup()
* b00c6c5 Insert padding in __cxa_dependent_exception
* 45ca8b1 Insert padding in __cxa_exception struct for compatibility
* f2e5509 Fix unlock in two-word version and add missing comment.
- 6229590 Add an option for disabling emergency buffers. (#14)

MFC after: 2 weeks

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Merge libcxxrt commit 45ca8b1942090226ba9368caeeeabc0d4ee41ad6

Insert padding in __cxa_exception struct for compatibility

Similar to https://github.com/llvm/llvm-project/commit/f2a436058fcb, th

Merge libcxxrt commit 45ca8b1942090226ba9368caeeeabc0d4ee41ad6

Insert padding in __cxa_exception struct for compatibility

Similar to https://github.com/llvm/llvm-project/commit/f2a436058fcb, the
addition of __attribute__((__aligned__)) to _Unwind_Exception (in commit
b9616964) causes implicit padding to be inserted before the unwindHeader
field in __cxa_exception.

Applications attempt to get at the earlier fields in __cxa_exception, so
preserve the same negative offsets in __cxa_exception, by moving the
padding to the beginning of the struct.

The assumption here is that if the ABI is not aware of the padding
before unwindHeader and put the referenceCount/primaryException in
there, no padding should exist before unwindHeader.

This should make libreoffice's custom exception handling mechanisms work
correctly, even if it was built against an older cxxabi.h/unwind.h pair.

PR: 263370
MFC after: 3 days

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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 r276418.

Import libcxxrt master 00bc29eb6513624824a6d7db2ebc768a4216a604.

Interesting fixes:
76584a0 Reorganize code to use only 32bit atomic ops for 32bit platforms
30d2ae5 Implement __cxa_throw_bad_array

Import libcxxrt master 00bc29eb6513624824a6d7db2ebc768a4216a604.

Interesting fixes:
76584a0 Reorganize code to use only 32bit atomic ops for 32bit platforms
30d2ae5 Implement __cxa_throw_bad_array_new_length

Reviewed by: bapt
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D1390

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MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

MFH: tracking commit

Sponsored by: The FreeBSD Foundation

Merge head up to r262222 (last merge was incomplete).

Pull in upstream libcxxrt commit 8006101, which makes its cxxabi.h file
compilable just by itself.

PR: kern/184019
MFC after: 3 days

Merge head r233826 through r256722.

Merge from head

IFC @ r254014

IFC @ r253461

IFC @253398

Import new libcxxrt / libc++. This brings some bug fixes, including a potential race condition for static initialisers.

MFC

IFC @ r234692

sys/amd64/include/cpufunc.h
sys/amd64/include/fpu.h
sys/amd64/amd64/fpu.c
sys/amd64/vmm/vmm.c

- Add API to allow vmm FPU state init/save/restore.

FP stuff discussed with: kib

Merge head r232686 through r233825 into projects/pf/head.