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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_ARM_FTRACE
3 #define _ASM_ARM_FTRACE
4 
5 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
6 #define ARCH_SUPPORTS_FTRACE_OPS 1
7 #endif
8 
9 #ifdef CONFIG_FUNCTION_TRACER
10 #define MCOUNT_ADDR		((unsigned long)(__gnu_mcount_nc))
11 #define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */
12 
13 #ifndef __ASSEMBLY__
14 extern void __gnu_mcount_nc(void);
15 
16 #ifdef CONFIG_DYNAMIC_FTRACE
17 struct dyn_arch_ftrace {
18 #ifdef CONFIG_ARM_MODULE_PLTS
19 	struct module *mod;
20 #endif
21 };
22 
ftrace_call_adjust(unsigned long addr)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 #endif
29 
30 #endif
31 
32 #endif
33 
34 #ifndef __ASSEMBLY__
35 
36 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
37 /*
38  * return_address uses walk_stackframe to do it's work.  If both
39  * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
40  * information.  For this to work in the function tracer many functions would
41  * have to be marked with __notrace.  So for now just depend on
42  * !CONFIG_ARM_UNWIND.
43  */
44 
45 void *return_address(unsigned int);
46 
47 #else
48 
return_address(unsigned int level)49 static inline void *return_address(unsigned int level)
50 {
51 	return NULL;
52 }
53 
54 #endif
55 
56 #define ftrace_return_address(n) return_address(n)
57 
58 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
59 
arch_syscall_match_sym_name(const char * sym,const char * name)60 static inline bool arch_syscall_match_sym_name(const char *sym,
61 					       const char *name)
62 {
63 	if (!strcmp(sym, "sys_mmap2"))
64 		sym = "sys_mmap_pgoff";
65 	else if (!strcmp(sym, "sys_statfs64_wrapper"))
66 		sym = "sys_statfs64";
67 	else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
68 		sym = "sys_fstatfs64";
69 	else if (!strcmp(sym, "sys_arm_fadvise64_64"))
70 		sym = "sys_fadvise64_64";
71 
72 	/* Ignore case since sym may start with "SyS" instead of "sys" */
73 	return !strcasecmp(sym, name);
74 }
75 
76 #endif /* ifndef __ASSEMBLY__ */
77 
78 #endif /* _ASM_ARM_FTRACE */
79