2 * arch/sh/kernel/return_address.c
4 * Copyright (C) 2009 Matt Fleming
5 * Copyright (C) 2009 Paul Mundt
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
11 #include <linux/kernel.h>
12 #include <asm/dwarf.h>
14 #ifdef CONFIG_DWARF_UNWINDER
16 void *return_address(unsigned int depth)
18 struct dwarf_frame *frame;
22 for (i = 0, frame = NULL, ra = 0; i <= depth; i++) {
23 struct dwarf_frame *tmp;
25 tmp = dwarf_unwind_stack(ra, frame);
28 dwarf_free_frame(frame);
32 if (!frame || !frame->return_addr)
35 ra = frame->return_addr;
38 /* Failed to unwind the stack to the specified depth. */
39 WARN_ON(i != depth + 1);
42 dwarf_free_frame(frame);
49 void *return_address(unsigned int depth)