[Bug 290411] lib32: __syscall() not supported

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290411

            Bug ID: 290411
           Summary: lib32: __syscall() not supported
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: [email protected]
          Reporter: [email protected]
             Flags: mfc-stable15?, mfc-stable14?

While debugging a devel/libunwind failure in an armv7 program running on
aarch64,
I found that the program crashes with ENOSYS while calling __syscall().  Here
is a reproducer:

#include <sys/mman.h>
#include <sys/syscall.h>
#include <unistd.h>

int main()
{
        __syscall(SYS_mmap, 0, 4096, 3, MAP_ANON|MAP_PRIVATE, -1, 0);
}

This is effectively what the GET_MEMORY() macro in libunwind does.  Expected
output: nothing.  Actual output: Bad system call (core dumped).

I'll work around this failure in libunwind for now, but please fix this for the
future.

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