Remove compat hacks from libcxxrt's _Unwind_Exception

This reverts 9097e3cbcac4, which was in itself a revert of upstream
libcxxrt commits 88bdf6b290da ("Specify double-word alignment for ARM
unwind

Remove compat hacks from libcxxrt's _Unwind_Exception

This reverts 9097e3cbcac4, which was in itself a revert of upstream
libcxxrt commits 88bdf6b290da ("Specify double-word alignment for ARM
unwind") and b96169641f79 ("Updated Itanium unwind"), and a
reapplication of our commit 3c4fd2463bb2 ("libcxxrt: add padding in
__cxa_allocate_* to fix alignment").

The editors/libreoffice port will be patched to be able to cope with the
standards-compliant alignment of _Unwind_Exception and consequently,
that of __cxa_exception. The layouts and sizes of these structures
should then be completely the same for libcxxrt, libunwind and
libc++abi.

PR: 262008
Reviewed by: emaste, jhb, theraven
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D34488

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Partially revert libcxxrt changes to avoid _Unwind_Exception change

(Note I am also applying this to main and stable/13, to restore the old
libcxxrt ABI and to avoid having to maintain a compat libr

Partially revert libcxxrt changes to avoid _Unwind_Exception change

(Note I am also applying this to main and stable/13, to restore the old
libcxxrt ABI and to avoid having to maintain a compat library.)

After the recent cherry-picking of libcxxrt commits 0ee0dbfb0d26 and
d2b3fadf2db5, users reported that editors/libreoffice packages from the
official package builders did not start anymore. It turns out that the
combination of these commits subtly changes the ABI, requiring all
applications that depend on internal details of struct _Unwind_Exception
(available via unwind-arm.h and unwind-itanium.h) to be recompiled.

However, the FreeBSD package builders always use -RELEASE jails, so
these still use the old declaration of struct _Unwind_Exception, which
is not entirely compatible. In particular, LibreOffice uses this struct
in its internal "uno bridge" component, where it attempts to setup its
own exception handling mechanism.

To fix this incompatibility, go back to the old declarations of struct
_Unwind_Exception, and restore the __LP64__ specific workaround we had
in place before (which was to cope with yet another, older ABI bug).

Effectively, this reverts upstream libcxxrt commits 88bdf6b290da
("Specify double-word alignment for ARM unwind") and b96169641f79
("Updated Itanium unwind"), and reapplies our commit 3c4fd2463bb2
("libcxxrt: add padding in __cxa_allocate_* to fix alignment").

PR: 253840

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Merge libcxxrt master 8049924686b8414d8e652cbd2a52c763b48e8456

Interesting fixes:
b3c73ba libelftc_dem_gnu3: Sync with elftoolchain r3877
7b2335c Mostly fix __cxa_demangle after #3

Reported by: ari

Merge libcxxrt master 8049924686b8414d8e652cbd2a52c763b48e8456

Interesting fixes:
b3c73ba libelftc_dem_gnu3: Sync with elftoolchain r3877
7b2335c Mostly fix __cxa_demangle after #3

Reported by: arichardson
PR: 253226
MFC after: 3 days

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MFC @ r256071

This is just prior to the bhyve_npt_pmap import so will allow
just the change to be merged for easier debug.

Merge head r233826 through r256722.

Merge head@256284

IFC @256277

Approved by: ken (mentor)

MFC - tracking update.

Import a new libcxxrt. This fixes some potential crashing in the demangler.

Approved by: re (gjb)
MFC after: 1 week

IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.

Merge from head

IFC @ r255209

Remove __attribute__((__aligned__)) that generates incorrect alignment on compilers that know about SSE. Code left over from old header that thought that 64 bits was the maximum alignment that anyth

Remove __attribute__((__aligned__)) that generates incorrect alignment on compilers that know about SSE. Code left over from old header that thought that 64 bits was the maximum alignment that anything would ever need...

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IFC @230489 (pending review).

IFC to head to catch up the bhyve branch

Approved by: grehan@

Import libc++ / libcxxrt into base. Not build by default yet (use
MK_LIBCPLUSPLUS=yes to enable). This is a work-in-progress. It works for
me, but is not guaranteed to work for anyone else and may

Import libc++ / libcxxrt into base. Not build by default yet (use
MK_LIBCPLUSPLUS=yes to enable). This is a work-in-progress. It works for
me, but is not guaranteed to work for anyone else and may eat your dog.

To build C++ using libc++, add -stdlib=libc++ to your CXX and LD flags.

Bug reports welcome, bug fixes even more welcome...

Approved by: dim (mentor)

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