arm64: Add initial stubs for stackframe and time

Signed-off-by: Jaroslaw Pelczar <[email protected]>
Change-Id: Ie17279a9c17ab8bb7a812fe83d1b668853f96d5c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1858
Reviewed-by: Alex von Gluck IV <[email protected]>

src/system/libroot/os/arch/arm64/Jamfile

@@ -16,6 +16,8 @@ for architectureObject in [ MultiArchSubDirSetup arm64 ] {
 			tls.c
 			thread.c
 			system_time.c
+			time.c
+			get_stack_frame.S
 
 			generic_atomic.cpp
 			generic_stack_trace.cpp

src/system/libroot/os/arch/arm64/get_stack_frame.S

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2019 Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#include <asm_defs.h>
+
+/* void* get_stack_frame(void) */
+FUNCTION(get_stack_frame):
+	mov		x0, fp
+	ret
+FUNCTION_END(get_stack_frame)

src/system/libroot/os/arch/arm64/time.c

@@ -0,0 +1,23 @@
+/* 
+ * Copyright 2006, Ingo Weinhold <[email protected]>.
+ * Distributed under the terms of the MIT License.
+ */
+
+#include <OS.h>
+
+#include <arch_cpu.h>
+#include <libroot_private.h>
+#include <real_time_data.h>
+
+
+void
+__arch_init_time(struct real_time_data *data, bool setDefaults)
+{
+}
+
+
+bigtime_t
+__arch_get_system_time_offset(struct real_time_data *data)
+{
+	return 0;
+}