1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_ARM_FTRACE
3 #define _ASM_ARM_FTRACE
4
5 #define HAVE_FUNCTION_GRAPH_FP_TEST
6
7 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
8 #define ARCH_SUPPORTS_FTRACE_OPS 1
9 #endif
10
11 #ifdef CONFIG_FUNCTION_TRACER
12 #define MCOUNT_ADDR ((unsigned long)(__gnu_mcount_nc))
13 #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
14
15 #ifndef __ASSEMBLY__
16 extern void __gnu_mcount_nc(void);
17
18 #ifdef CONFIG_DYNAMIC_FTRACE
19 struct dyn_arch_ftrace {
20 #ifdef CONFIG_ARM_MODULE_PLTS
21 struct module *mod;
22 #endif
23 };
24
25 static inline unsigned long ftrace_call_adjust(unsigned long addr)
26 {
27 /* With Thumb-2, the recorded addresses have the lsb set */
28 return addr & ~1;
29 }
30 #endif
31
32 #endif
33
34 #endif
35
36 #ifndef __ASSEMBLY__
37
38 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
39 /*
40 * return_address uses walk_stackframe to do it's work. If both
41 * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
42 * information. For this to work in the function tracer many functions would
43 * have to be marked with __notrace. So for now just depend on
44 * !CONFIG_ARM_UNWIND.
45 */
46
47 void *return_address(unsigned int);
48
49 #else
50
51 static inline void *return_address(unsigned int level)
52 {
53 return NULL;
54 }
55
56 #endif
57
58 #define ftrace_return_address(n) return_address(n)
59
60 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
61
62 static inline bool arch_syscall_match_sym_name(const char *sym,
63 const char *name)
64 {
65 if (!strcmp(sym, "sys_mmap2"))
66 sym = "sys_mmap_pgoff";
67 else if (!strcmp(sym, "sys_statfs64_wrapper"))
68 sym = "sys_statfs64";
69 else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
70 sym = "sys_fstatfs64";
71 else if (!strcmp(sym, "sys_arm_fadvise64_64"))
72 sym = "sys_fadvise64_64";
73
74 /* Ignore case since sym may start with "SyS" instead of "sys" */
75 return !strcasecmp(sym, name);
76 }
77
78 void prepare_ftrace_return(unsigned long *parent, unsigned long self,
79 unsigned long frame_pointer,
80 unsigned long stack_pointer);
81
82 #endif /* ifndef __ASSEMBLY__ */
83
84 #endif /* _ASM_ARM_FTRACE */
85
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