2 * arch/arm64/kernel/return_address.c
4 * Copyright (C) 2013 Linaro Limited
5 * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/export.h>
13 #include <linux/ftrace.h>
15 #include <asm/stack_pointer.h>
16 #include <asm/stacktrace.h>
18 struct return_address_data {
23 static int save_return_addr(struct stackframe *frame, void *d)
25 struct return_address_data *data = d;
28 data->addr = (void *)frame->pc;
36 void *return_address(unsigned int level)
38 struct return_address_data data;
39 struct stackframe frame;
41 data.level = level + 2;
44 frame.fp = (unsigned long)__builtin_frame_address(0);
45 frame.sp = current_stack_pointer;
46 frame.pc = (unsigned long)return_address; /* dummy */
47 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
48 frame.graph = current->curr_ret_stack;
51 walk_stackframe(current, &frame, save_return_addr, &data);
58 EXPORT_SYMBOL_GPL(return_address);