1 /*
2 * trace_export.c - export basic ftrace utilities to user space
3 *
4 * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
5 */
6 #include <linux/stringify.h>
7 #include <linux/kallsyms.h>
8 #include <linux/seq_file.h>
9 #include <linux/debugfs.h>
10 #include <linux/uaccess.h>
11 #include <linux/ftrace.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/fs.h>
15
16 #include "trace_output.h"
17
18 #undef TRACE_SYSTEM
19 #define TRACE_SYSTEM ftrace
20
21 /*
22 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
23 * function and thus become accesible via perf.
24 */
25 #undef FTRACE_ENTRY_REG
26 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
27 filter, regfn) \
28 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
29 filter)
30
31 /* not needed for this file */
32 #undef __field_struct
33 #define __field_struct(type, item)
34
35 #undef __field
36 #define __field(type, item) type item;
37
38 #undef __field_desc
39 #define __field_desc(type, container, item) type item;
40
41 #undef __array
42 #define __array(type, item, size) type item[size];
43
44 #undef __array_desc
45 #define __array_desc(type, container, item, size) type item[size];
46
47 #undef __dynamic_array
48 #define __dynamic_array(type, item) type item[];
49
50 #undef F_STRUCT
51 #define F_STRUCT(args...) args
52
53 #undef F_printk
54 #define F_printk(fmt, args...) fmt, args
55
56 #undef FTRACE_ENTRY
57 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
58 struct ____ftrace_##name { \
59 tstruct \
60 }; \
61 static void __always_unused ____ftrace_check_##name(void) \
62 { \
63 struct ____ftrace_##name *__entry = NULL; \
64 \
65 /* force compile-time check on F_printk() */ \
66 printk(print); \
67 }
68
69 #undef FTRACE_ENTRY_DUP
70 #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \
71 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
72 filter)
73
74 #include "trace_entries.h"
75
76 #undef __field
77 #define __field(type, item) \
78 ret = trace_define_field(event_call, #type, #item, \
79 offsetof(typeof(field), item), \
80 sizeof(field.item), \
81 is_signed_type(type), filter_type); \
82 if (ret) \
83 return ret;
84
85 #undef __field_desc
86 #define __field_desc(type, container, item) \
87 ret = trace_define_field(event_call, #type, #item, \
88 offsetof(typeof(field), \
89 container.item), \
90 sizeof(field.container.item), \
91 is_signed_type(type), filter_type); \
92 if (ret) \
93 return ret;
94
95 #undef __array
96 #define __array(type, item, len) \
97 do { \
98 char *type_str = #type"["__stringify(len)"]"; \
99 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
100 ret = trace_define_field(event_call, type_str, #item, \
101 offsetof(typeof(field), item), \
102 sizeof(field.item), \
103 is_signed_type(type), filter_type); \
104 if (ret) \
105 return ret; \
106 } while (0);
107
108 #undef __array_desc
109 #define __array_desc(type, container, item, len) \
110 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
111 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
112 offsetof(typeof(field), \
113 container.item), \
114 sizeof(field.container.item), \
115 is_signed_type(type), filter_type); \
116 if (ret) \
117 return ret;
118
119 #undef __dynamic_array
120 #define __dynamic_array(type, item) \
121 ret = trace_define_field(event_call, #type, #item, \
122 offsetof(typeof(field), item), \
123 0, is_signed_type(type), filter_type);\
124 if (ret) \
125 return ret;
126
127 #undef FTRACE_ENTRY
128 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
129 static int __init \
130 ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
131 { \
132 struct struct_name field; \
133 int ret; \
134 int filter_type = filter; \
135 \
136 tstruct; \
137 \
138 return ret; \
139 }
140
141 #include "trace_entries.h"
142
143 #undef __entry
144 #define __entry REC
145
146 #undef __field
147 #define __field(type, item)
148
149 #undef __field_desc
150 #define __field_desc(type, container, item)
151
152 #undef __array
153 #define __array(type, item, len)
154
155 #undef __array_desc
156 #define __array_desc(type, container, item, len)
157
158 #undef __dynamic_array
159 #define __dynamic_array(type, item)
160
161 #undef F_printk
162 #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
163
164 #undef FTRACE_ENTRY_REG
165 #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
166 regfn) \
167 \
168 struct ftrace_event_class __refdata event_class_ftrace_##call = { \
169 .system = __stringify(TRACE_SYSTEM), \
170 .define_fields = ftrace_define_fields_##call, \
171 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
172 .reg = regfn, \
173 }; \
174 \
175 struct ftrace_event_call __used event_##call = { \
176 .class = &event_class_ftrace_##call, \
177 { \
178 .name = #call, \
179 }, \
180 .event.type = etype, \
181 .print_fmt = print, \
182 .flags = TRACE_EVENT_FL_IGNORE_ENABLE | TRACE_EVENT_FL_USE_CALL_FILTER, \
183 }; \
184 struct ftrace_event_call __used \
185 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
186
187 #undef FTRACE_ENTRY
188 #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \
189 FTRACE_ENTRY_REG(call, struct_name, etype, \
190 PARAMS(tstruct), PARAMS(print), filter, NULL)
191
ftrace_event_is_function(struct ftrace_event_call * call)192 int ftrace_event_is_function(struct ftrace_event_call *call)
193 {
194 return call == &event_function;
195 }
196
197 #include "trace_entries.h"
198