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 
17 extern void _mcount(void);
18 #define MCOUNT_ADDR ((unsigned long)_mcount)
19 
ftrace_call_adjust(unsigned long addr)20 static inline unsigned long ftrace_call_adjust(unsigned long addr)
21 {
22 	return addr;
23 }
24 
25 struct 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 
return_address(unsigned int level)34 extern 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 
return_address(unsigned int level)62 extern 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
83