xref: /openbmc/linux/arch/arm/include/asm/ftrace.h (revision 57ee11ea)
1 #ifndef _ASM_ARM_FTRACE
2 #define _ASM_ARM_FTRACE
3 
4 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
5 #define ARCH_SUPPORTS_FTRACE_OPS 1
6 #endif
7 
8 #ifdef CONFIG_FUNCTION_TRACER
9 #define MCOUNT_ADDR		((unsigned long)(__gnu_mcount_nc))
10 #define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */
11 
12 #ifndef __ASSEMBLY__
13 extern void mcount(void);
14 extern void __gnu_mcount_nc(void);
15 
16 #ifdef CONFIG_DYNAMIC_FTRACE
17 struct dyn_arch_ftrace {
18 #ifdef CONFIG_OLD_MCOUNT
19 	bool	old_mcount;
20 #endif
21 };
22 
23 static inline unsigned long ftrace_call_adjust(unsigned long addr)
24 {
25 	/* With Thumb-2, the recorded addresses have the lsb set */
26 	return addr & ~1;
27 }
28 
29 extern void ftrace_caller_old(void);
30 extern void ftrace_call_old(void);
31 #endif
32 
33 #endif
34 
35 #endif
36 
37 #ifndef __ASSEMBLY__
38 
39 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
40 /*
41  * return_address uses walk_stackframe to do it's work.  If both
42  * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
43  * information.  For this to work in the function tracer many functions would
44  * have to be marked with __notrace.  So for now just depend on
45  * !CONFIG_ARM_UNWIND.
46  */
47 
48 void *return_address(unsigned int);
49 
50 #else
51 
52 static inline void *return_address(unsigned int level)
53 {
54 	return NULL;
55 }
56 
57 #endif
58 
59 #define ftrace_return_address(n) return_address(n)
60 
61 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
62 
63 static inline bool arch_syscall_match_sym_name(const char *sym,
64 					       const char *name)
65 {
66 	if (!strcmp(sym, "sys_mmap2"))
67 		sym = "sys_mmap_pgoff";
68 	else if (!strcmp(sym, "sys_statfs64_wrapper"))
69 		sym = "sys_statfs64";
70 	else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
71 		sym = "sys_fstatfs64";
72 	else if (!strcmp(sym, "sys_arm_fadvise64_64"))
73 		sym = "sys_fadvise64_64";
74 
75 	/* Ignore case since sym may start with "SyS" instead of "sys" */
76 	return !strcasecmp(sym, name);
77 }
78 
79 #endif /* ifndef __ASSEMBLY__ */
80 
81 #endif /* _ASM_ARM_FTRACE */
82