1/*
 2 * Blackfin ftrace code
 3 *
 4 * Copyright 2009 Analog Devices Inc.
 5 * Licensed under the GPL-2 or later.
 6 */
 7
 8#ifndef __ASM_BFIN_FTRACE_H__
 9#define __ASM_BFIN_FTRACE_H__
10
11#define MCOUNT_INSN_SIZE	6 /* sizeof "[++sp] = rets; call __mcount;" */
12
13#ifndef __ASSEMBLY__
14
15#ifdef CONFIG_DYNAMIC_FTRACE
16
17extern void _mcount(void);
18#define MCOUNT_ADDR ((unsigned long)_mcount)
19
20static inline unsigned long ftrace_call_adjust(unsigned long addr)
21{
22	return addr;
23}
24
25struct dyn_arch_ftrace {
26	/* No extra data needed for Blackfin */
27};
28
29#endif
30
31#ifdef CONFIG_FRAME_POINTER
32#include <linux/mm.h>
33
34extern inline void *return_address(unsigned int level)
35{
36	unsigned long *endstack, *fp, *ret_addr;
37	unsigned int current_level = 0;
38
39	if (level == 0)
40		return __builtin_return_address(0);
41
42	fp = (unsigned long *)__builtin_frame_address(0);
43	endstack = (unsigned long *)PAGE_ALIGN((unsigned long)&level);
44
45	while (((unsigned long)fp & 0x3) == 0 && fp &&
46	       (fp + 1) < endstack && current_level < level) {
47		fp = (unsigned long *)*fp;
48		current_level++;
49	}
50
51	if (((unsigned long)fp & 0x3) == 0 && fp &&
52	    (fp + 1) < endstack)
53		ret_addr = (unsigned long *)*(fp + 1);
54	else
55		ret_addr = NULL;
56
57	return ret_addr;
58}
59
60#else
61
62extern inline void *return_address(unsigned int level)
63{
64	return NULL;
65}
66
67#endif /* CONFIG_FRAME_POINTER */
68
69#define HAVE_ARCH_CALLER_ADDR
70
71/* inline function or macro may lead to unexpected result */
72#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
73#define CALLER_ADDR1 ((unsigned long)return_address(1))
74#define CALLER_ADDR2 ((unsigned long)return_address(2))
75#define CALLER_ADDR3 ((unsigned long)return_address(3))
76#define CALLER_ADDR4 ((unsigned long)return_address(4))
77#define CALLER_ADDR5 ((unsigned long)return_address(5))
78#define CALLER_ADDR6 ((unsigned long)return_address(6))
79
80#endif /* __ASSEMBLY__ */
81
82#endif