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ftrace.h
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1 #ifndef _ASM_ARM_FTRACE
2 #define _ASM_ARM_FTRACE
3 
4 #ifdef CONFIG_FUNCTION_TRACER
5 #define MCOUNT_ADDR ((unsigned long)(__gnu_mcount_nc))
6 #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
7 
8 #ifndef __ASSEMBLY__
9 extern void mcount(void);
10 extern void __gnu_mcount_nc(void);
11 
12 #ifdef CONFIG_DYNAMIC_FTRACE
13 struct dyn_arch_ftrace {
14 #ifdef CONFIG_OLD_MCOUNT
15  bool old_mcount;
16 #endif
17 };
18 
19 static inline unsigned long ftrace_call_adjust(unsigned long addr)
20 {
21  /* With Thumb-2, the recorded addresses have the lsb set */
22  return addr & ~1;
23 }
24 
25 extern void ftrace_caller_old(void);
26 extern void ftrace_call_old(void);
27 #endif
28 
29 #endif
30 
31 #endif
32 
33 #ifndef __ASSEMBLY__
34 
35 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
36 /*
37  * return_address uses walk_stackframe to do it's work. If both
38  * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
39  * information. For this to work in the function tracer many functions would
40  * have to be marked with __notrace. So for now just depend on
41  * !CONFIG_ARM_UNWIND.
42  */
43 
44 void *return_address(unsigned int);
45 
46 #else
47 
48 extern inline void *return_address(unsigned int level)
49 {
50  return NULL;
51 }
52 
53 #endif
54 
55 #define HAVE_ARCH_CALLER_ADDR
56 
57 #define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
58 #define CALLER_ADDR1 ((unsigned long)return_address(1))
59 #define CALLER_ADDR2 ((unsigned long)return_address(2))
60 #define CALLER_ADDR3 ((unsigned long)return_address(3))
61 #define CALLER_ADDR4 ((unsigned long)return_address(4))
62 #define CALLER_ADDR5 ((unsigned long)return_address(5))
63 #define CALLER_ADDR6 ((unsigned long)return_address(6))
64 
65 #endif /* ifndef __ASSEMBLY__ */
66 
67 #endif /* _ASM_ARM_FTRACE */