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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/arm64/kernel/return_address.c
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/stacktrace.h>
17 struct return_address_data
{
22 static int save_return_addr(struct stackframe
*frame
, void *d
)
24 struct return_address_data
*data
= d
;
27 data
->addr
= (void *)frame
->pc
;
35 void *return_address(unsigned int level
)
37 struct return_address_data data
;
38 struct stackframe frame
;
40 data
.level
= level
+ 2;
43 frame
.fp
= (unsigned long)__builtin_frame_address(0);
44 frame
.sp
= current_stack_pointer
;
45 frame
.pc
= (unsigned long)return_address
; /* dummy */
46 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
47 frame
.graph
= current
->curr_ret_stack
;
50 walk_stackframe(current
, &frame
, save_return_addr
, &data
);
57 EXPORT_SYMBOL_GPL(return_address
);