[Bug 254693] random crashes with armv7 thumb application on arm64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254693

            Bug ID: 254693
           Summary: random crashes with armv7 thumb application on arm64
           Product: Base System
           Version: 13.0-STABLE
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: fuz at fuz.su

I'm trying to run Mecrisp Stellaris 2.5.8 on arm64 FreeBSD.  This is a Forth
system written entirely in armv7 thumb2 assembly.  A FreeBSD port has existed
for a while and has recently been made available as lang/mecrisp-stellaris in
the ports tree.

It appears that with FreeBSD 13, rudimentary support for loading and running
armv7 binaries from arm64 FreeBSD exists.  And indeed, mecrisp-stellaris loads
and executes fine.  However, problems crop up once more definitions are loaded.
 Specifically, the system crashes in random places with a wildly inconsistent
program state.

To reproduce the issue, download Mecrisp Stellaris 2.5.8 from Sourceforge [1]
onto an arm64 FreeBSD 13 system.  Navigate into the freebsd-ra directory and
execute "buildcore-freebsd".  You should see a few pages of output followed by
a crash.  The crash is a segmentation fault or an illegal instruction fault.

The same issue does not seem to appear on armv7 FreeBSD, so I'm a bit at a loss
as to what may have caused this.

[1]:
https://sourceforge.net/projects/mecrisp/files/mecrisp-stellaris-2.5.8.tar.gz

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