Index: head/sys/arm64/linux/linux_dummy.c
===================================================================
--- head/sys/arm64/linux/linux_dummy.c	(nonexistent)
+++ head/sys/arm64/linux/linux_dummy.c	(revision 335235)
@@ -0,0 +1,177 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2013 Dmitry Chagin
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_compat.h"
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/sdt.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+
+#include <arm64/linux/linux.h>
+#include <arm64/linux/linux_proto.h>
+#include <compat/linux/linux_dtrace.h>
+#include <compat/linux/linux_util.h>
+
+// LINUXTODO: deduplicate arm64 dummy against other archs?
+// LINUXTODO: review/update/add unimplemented syscalls
+
+/* DTrace init */
+LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
+
+UNIMPLEMENTED(afs_syscall);
+UNIMPLEMENTED(create_module);	/* Added in Linux 1.0 removed in 2.6. */
+UNIMPLEMENTED(epoll_ctl_old);
+UNIMPLEMENTED(epoll_wait_old);
+UNIMPLEMENTED(get_kernel_syms);	/* Added in Linux 1.0 removed in 2.6. */
+UNIMPLEMENTED(get_thread_area);
+UNIMPLEMENTED(getpmsg);
+UNIMPLEMENTED(nfsservctl);	/* Added in Linux 2.2 removed in 3.1. */
+UNIMPLEMENTED(putpmsg);
+UNIMPLEMENTED(query_module);	/* Added in Linux 2.2 removed in 2.6. */
+UNIMPLEMENTED(security);
+UNIMPLEMENTED(set_thread_area);
+UNIMPLEMENTED(tuxcall);
+UNIMPLEMENTED(uselib);
+UNIMPLEMENTED(vserver);
+
+DUMMY(sendfile);
+DUMMY(syslog);
+DUMMY(setfsuid);
+DUMMY(setfsgid);
+DUMMY(vhangup);
+DUMMY(pivot_root);
+DUMMY(adjtimex);
+DUMMY(swapoff);
+DUMMY(init_module);
+DUMMY(delete_module);
+DUMMY(lookup_dcookie);
+DUMMY(remap_file_pages);
+DUMMY(semtimedop);
+DUMMY(mbind);
+DUMMY(get_mempolicy);
+DUMMY(set_mempolicy);
+DUMMY(mq_open);
+DUMMY(mq_unlink);
+DUMMY(mq_timedsend);
+DUMMY(mq_timedreceive);
+DUMMY(mq_notify);
+DUMMY(mq_getsetattr);
+DUMMY(kexec_load);
+/* Linux 2.6.11: */
+DUMMY(add_key);
+DUMMY(request_key);
+DUMMY(keyctl);
+/* Linux 2.6.13: */
+DUMMY(ioprio_set);
+DUMMY(ioprio_get);
+DUMMY(inotify_add_watch);
+DUMMY(inotify_rm_watch);
+/* Linux 2.6.16: */
+DUMMY(migrate_pages);
+DUMMY(unshare);
+/* Linux 2.6.17: */
+DUMMY(splice);
+DUMMY(tee);
+DUMMY(sync_file_range);
+DUMMY(vmsplice);
+/* Linux 2.6.18: */
+DUMMY(move_pages);
+/* Linux 2.6.27: */
+DUMMY(signalfd4);
+DUMMY(inotify_init1);
+/* Linux 2.6.31: */
+DUMMY(perf_event_open);
+/* Linux 2.6.38: */
+DUMMY(fanotify_init);
+DUMMY(fanotify_mark);
+/* Linux 2.6.39: */
+DUMMY(name_to_handle_at);
+DUMMY(open_by_handle_at);
+DUMMY(clock_adjtime);
+/* Linux 3.0: */
+DUMMY(setns);
+DUMMY(getcpu);
+/* Linux 3.2: */
+DUMMY(process_vm_readv);
+DUMMY(process_vm_writev);
+/* Linux 3.5: */
+DUMMY(kcmp);
+/* Linux 3.8: */
+DUMMY(finit_module);
+DUMMY(sched_setattr);
+DUMMY(sched_getattr);
+/* Linux 3.14: */
+DUMMY(renameat2);
+/* Linux 3.15: */
+DUMMY(seccomp);
+DUMMY(memfd_create);
+/* Linux 3.18: */
+DUMMY(bpf);
+/* Linux 3.19: */
+DUMMY(execveat);
+/* Linux 4.2: */
+DUMMY(userfaultfd);
+/* Linux 4.3: */
+DUMMY(membarrier);
+/* Linux 4.4: */
+DUMMY(mlock2);
+/* Linux 4.5: */
+DUMMY(copy_file_range);
+/* Linux 4.6: */
+DUMMY(preadv2);
+DUMMY(pwritev2);
+/* Linux 4.8: */
+DUMMY(pkey_mprotect);
+DUMMY(pkey_alloc);
+DUMMY(pkey_free);
+
+#define DUMMY_XATTR(s)						\
+int								\
+linux_ ## s ## xattr(						\
+    struct thread *td, struct linux_ ## s ## xattr_args *arg)	\
+{								\
+								\
+	return (ENOATTR);					\
+}
+DUMMY_XATTR(set);
+DUMMY_XATTR(lset);
+DUMMY_XATTR(fset);
+DUMMY_XATTR(get);
+DUMMY_XATTR(lget);
+DUMMY_XATTR(fget);
+DUMMY_XATTR(list);
+DUMMY_XATTR(llist);
+DUMMY_XATTR(flist);
+DUMMY_XATTR(remove);
+DUMMY_XATTR(lremove);
+DUMMY_XATTR(fremove);

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