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arch
sh
kernel
return_address.c
Go to the documentation of this file.
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/*
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* arch/sh/kernel/return_address.c
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*
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* Copyright (C) 2009 Matt Fleming
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* Copyright (C) 2009 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <
asm/dwarf.h
>
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#ifdef CONFIG_DWARF_UNWINDER
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void
*
return_address
(
unsigned
int
depth
)
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{
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struct
dwarf_frame *
frame
;
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unsigned
long
ra
;
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int
i
;
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for
(i = 0, frame =
NULL
, ra = 0; i <=
depth
; i++) {
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struct
dwarf_frame *
tmp
;
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tmp =
dwarf_unwind_stack
(ra, frame);
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if
(!tmp)
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return
NULL
;
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if
(frame)
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dwarf_free_frame
(frame);
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frame =
tmp
;
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if
(!frame || !frame->return_addr)
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break
;
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ra = frame->return_addr;
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}
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/* Failed to unwind the stack to the specified depth. */
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WARN_ON
(i != depth + 1);
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if
(frame)
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dwarf_free_frame
(frame);
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return
(
void
*)
ra
;
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}
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#else
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void
*
return_address
(
unsigned
int
depth)
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{
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return
NULL
;
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}
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#endif
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EXPORT_SYMBOL_GPL
(
return_address
);
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