1 // SPDX-License-Identifier: GPL-2.0-only
3 * arch/arm/kernel/return_address.c
5 * Copyright (C) 2009 Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
8 #include <linux/export.h>
9 #include <linux/ftrace.h>
10 #include <linux/sched.h>
12 #include <asm/stacktrace.h>
14 struct return_address_data {
19 static int save_return_addr(struct stackframe *frame, void *d)
21 struct return_address_data *data = d;
24 data->addr = (void *)frame->pc;
33 void *return_address(unsigned int level)
35 struct return_address_data data;
36 struct stackframe frame;
38 data.level = level + 2;
41 frame.fp = (unsigned long)__builtin_frame_address(0);
42 frame.sp = current_stack_pointer;
43 frame.lr = (unsigned long)__builtin_return_address(0);
44 frame.pc = (unsigned long)return_address;
46 walk_stackframe(&frame, save_return_addr, &data);
54 EXPORT_SYMBOL_GPL(return_address);