Index: sys/arm64/linux/linux_locore.s
===================================================================
--- /dev/null
+++ sys/arm64/linux/linux_locore.s
@@ -0,0 +1,32 @@
+/* $FreeBSD$ */
+
+#include <machine/asm.h>
+
+	.data
+
+	.globl linux_platform
+linux_platform:
+	.asciz "arm64"
+
+
+	.text
+
+// LINUXTODO: implement __kernel_rt_sigreturn
+ENTRY(__kernel_rt_sigreturn)
+	brk #0
+	ret
+
+// LINUXTODO: implement __kernel_gettimeofday
+ENTRY(__kernel_gettimeofday)
+	brk #0
+	ret
+
+// LINUXTODO: implement __kernel_clock_gettime
+ENTRY(__kernel_clock_gettime)
+	brk #0
+	ret
+
+// LINUXTODO: implement __kernel_clock_getres
+ENTRY(__kernel_clock_getres)
+	brk #0
+	ret
Index: sys/arm64/linux/linux_machdep.c
===================================================================
--- /dev/null
+++ sys/arm64/linux/linux_machdep.c
@@ -0,0 +1,104 @@
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/fcntl.h>
+#include <sys/imgact.h>
+#include <sys/ktr.h>
+#include <sys/proc.h>
+#include <sys/sdt.h>
+
+#include <arm64/linux/linux.h>
+#include <arm64/linux/linux_proto.h>
+#include <compat/linux/linux_dtrace.h>
+#include <compat/linux/linux_emul.h>
+#include <compat/linux/linux_misc.h>
+#include <compat/linux/linux_mmap.h>
+#include <compat/linux/linux_util.h>
+
+/* DTrace init */
+LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
+
+/* DTrace probes */
+LIN_SDT_PROBE_DEFINE0(machdep, linux_set_upcall_kse, todo);
+LIN_SDT_PROBE_DEFINE0(machdep, linux_mmap2, todo);
+LIN_SDT_PROBE_DEFINE0(machdep, linux_mprotect, todo);
+LIN_SDT_PROBE_DEFINE0(machdep, linux_rt_sigsuspend, todo);
+LIN_SDT_PROBE_DEFINE0(machdep, linux_sigaltstack, todo);
+LIN_SDT_PROBE_DEFINE0(machdep, linux_set_cloned_tls, todo);
+
+// LINUXTODO: deduplicate?
+int
+linux_execve(struct thread *td, struct linux_execve_args *args)
+{
+	struct image_args eargs;
+	char *path;
+	int error;
+
+	LCONVPATHEXIST(td, args->path, &path);
+
+	LINUX_CTR(execve);
+
+	error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp,
+	    args->envp);
+	free(path, M_TEMP);
+	if (error == 0)
+		error = linux_common_execve(td, &eargs);
+	return (error);
+}
+
+// LINUXTODO: implement/deduplicate arm64 linux_set_upcall_kse
+int
+linux_set_upcall_kse(struct thread *td, register_t stack)
+{
+
+	LIN_SDT_PROBE0(machdep, linux_set_upcall_kse, todo);
+	return (EDOOFUS);
+}
+
+/* LINUXTODO deduplicate arm64 linux_mmap2?*/
+int
+linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
+{
+
+	LIN_SDT_PROBE0(machdep, linux_mmap2, todo);
+	return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
+	    args->flags, args->fd, args->pgoff));
+}
+
+// XXX why uap vs args?
+// LINUXTODO: implement/deduplicate arm64 linux_mprotect
+int
+linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
+{
+
+	LIN_SDT_PROBE0(machdep, linux_mprotect, todo);
+	return (EDOOFUS);
+}
+
+// LINUXTODO: implement arm64 linux_rt_sigsuspend
+int
+linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
+{
+
+	LIN_SDT_PROBE0(machdep, linux_rt_sigsuspend, todo);
+	return (EDOOFUS);
+}
+
+// LINUXTODO: implement arm64 linux_sigaltstack
+int
+linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
+{
+
+	LIN_SDT_PROBE0(machdep, linux_sigaltstack, todo);
+	return (EDOOFUS);
+}
+
+// LINUXTODO: implement arm64 linux_set_cloned_tls
+int
+linux_set_cloned_tls(struct thread *td, void *desc)
+{
+
+	LIN_SDT_PROBE0(machdep, linux_set_cloned_tls, todo);
+	return (EDOOFUS);
+}
Index: sys/arm64/linux/linux_ptrace.c
===================================================================
--- /dev/null
+++ sys/arm64/linux/linux_ptrace.c
@@ -0,0 +1,27 @@
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/sdt.h>
+#include <sys/proc.h>
+#include <sys/ptrace.h>
+
+#include <arm64/linux/linux.h>
+#include <arm64/linux/linux_proto.h>
+#include <compat/linux/linux_dtrace.h>
+
+/* DTrace init */
+LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
+
+/* DTrace probes */
+LIN_SDT_PROBE_DEFINE0(ptrace, linux_ptrace, todo);
+
+// LINUXTODO: implement arm64 linux_ptrace
+int
+linux_ptrace(struct thread *td, struct linux_ptrace_args *uap)
+{
+
+	LIN_SDT_PROBE0(ptrace, linux_ptrace, todo);
+	return (EDOOFUS);
+}
Index: sys/arm64/linux/linux_support.s
===================================================================
--- /dev/null
+++ sys/arm64/linux/linux_support.s
@@ -0,0 +1,31 @@
+#include "linux_assym.h"
+//#include <machine/asmacros.h>
+#include <machine/asm.h>
+
+#include "assym.inc"
+
+// LINUXTODO: implement futex_*
+
+futex_fault:
+	brk #0
+	ret
+
+ENTRY(futex_xchgl)
+	brk #0
+	ret
+
+ENTRY(futex_addl)
+	brk #0
+	ret
+
+ENTRY(futex_orl)
+	brk #0
+	ret
+
+ENTRY(futex_andl)
+	brk #0
+	ret
+
+ENTRY(futex_xorl)
+	brk #0
+	ret