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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/arm/kernel/return_address.c
2 * arch/arm/kernel/return_address.c
4 * Copyright (C) 2009 Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
11 #include <linux/export.h>
12 #include <linux/ftrace.h>
14 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
15 #include <linux/sched.h>
17 #include <asm/stacktrace.h>
19 struct return_address_data
{
24 static int save_return_addr(struct stackframe
*frame
, void *d
)
26 struct return_address_data
*data
= d
;
29 data
->addr
= (void *)frame
->lr
;
38 void *return_address(unsigned int level
)
40 struct return_address_data data
;
41 struct stackframe frame
;
42 register unsigned long current_sp
asm ("sp");
44 data
.level
= level
+ 1;
46 frame
.fp
= (unsigned long)__builtin_frame_address(0);
47 frame
.sp
= current_sp
;
48 frame
.lr
= (unsigned long)__builtin_return_address(0);
49 frame
.pc
= (unsigned long)return_address
;
51 walk_stackframe(&frame
, save_return_addr
, &data
);
59 #else /* if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) */
61 #if defined(CONFIG_ARM_UNWIND)
62 #warning "TODO: return_address should use unwind tables"
65 void *return_address(unsigned int level
)
70 #endif /* if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) / else */
72 EXPORT_SYMBOL_GPL(return_address
);