diff --git a/gcc-9.1.0/config.guess b/gcc-9.1.0/config.guess
index 8e2a58b86..772577d8d 100755
--- a/gcc-9.1.0/config.guess
+++ b/gcc-9.1.0/config.guess
@@ -1309,6 +1309,9 @@ EOF
     *:Rhapsody:*:*)
 	echo "$UNAME_MACHINE"-apple-rhapsody"$UNAME_RELEASE"
 	exit ;;
+    arm64:Darwin:*:*)
+	echo aarch64-apple-darwin"$UNAME_RELEASE"
+	exit ;;
     *:Darwin:*:*)
 	UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
 	set_cc_for_build
diff --git a/gcc-9.1.0/gcc/config.host b/gcc-9.1.0/gcc/config.host
index 816a0f06c..adaa50b73 100644
--- a/gcc-9.1.0/gcc/config.host
+++ b/gcc-9.1.0/gcc/config.host
@@ -99,7 +99,8 @@ case ${host} in
 esac
 
 case ${host} in
-  aarch64*-*-freebsd* | aarch64*-*-linux* | aarch64*-*-fuchsia*)
+  aarch64*-*-freebsd* | aarch64*-*-linux* | aarch64*-*-fuchsia* |\
+  aarch64*-*-darwin*)
     case ${target} in
       aarch64*-*-*)
 	host_extra_gcc_objs="driver-aarch64.o"
@@ -263,6 +264,10 @@ case ${host} in
     out_host_hook_obj="${out_host_hook_obj} host-ppc64-darwin.o"
     host_xmake_file="${host_xmake_file} rs6000/x-darwin64"
     ;;
+  aarch64-*-darwin*)
+    out_host_hook_obj="${out_host_hook_obj} host-aarch64-darwin.o"
+    host_xmake_file="${host_xmake_file} aarch64/x-darwin"
+    ;;
   rs6000-ibm-aix* | powerpc-ibm-aix*)
     host_xmake_file="${host_xmake_file} rs6000/x-aix"
     ;;
diff --git a/gcc-9.1.0/gcc/config/aarch64/host-aarch64-darwin.c b/gcc-9.1.0/gcc/config/aarch64/host-aarch64-darwin.c
new file mode 100644
index 000000000..5ed81cf7d
--- /dev/null
+++ b/gcc-9.1.0/gcc/config/aarch64/host-aarch64-darwin.c
@@ -0,0 +1,32 @@
+/* i386-darwin host-specific hook definitions.
+   Copyright (C) 2003-2019 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#define IN_TARGET_CODE 1
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "hosthooks.h"
+#include "hosthooks-def.h"
+#include "config/host-darwin.h"
+
+/* Darwin doesn't do anything special for aarch64 hosts; this file exists just
+   to include config/host-darwin.h.  */
+
+const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
diff --git a/gcc-9.1.0/gcc/config/aarch64/x-darwin b/gcc-9.1.0/gcc/config/aarch64/x-darwin
new file mode 100644
index 000000000..6d788d5e8
--- /dev/null
+++ b/gcc-9.1.0/gcc/config/aarch64/x-darwin
@@ -0,0 +1,3 @@
+host-aarch64-darwin.o : $(srcdir)/config/aarch64/host-aarch64-darwin.c
+	$(COMPILE) $<
+	$(POSTCOMPILE)