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770cb243 SR |
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 | ||
4e5292ea SR |
18 | #undef TRACE_SYSTEM |
19 | #define TRACE_SYSTEM ftrace | |
da4d0302 | 20 | |
4e5292ea SR |
21 | /* not needed for this file */ |
22 | #undef __field_struct | |
23 | #define __field_struct(type, item) | |
da4d0302 | 24 | |
05ffa2d0 LZ |
25 | #undef __field |
26 | #define __field(type, item) type item; | |
27 | ||
28 | #undef __field_desc | |
29 | #define __field_desc(type, container, item) type item; | |
30 | ||
31 | #undef __array | |
32 | #define __array(type, item, size) type item[size]; | |
33 | ||
34 | #undef __array_desc | |
35 | #define __array_desc(type, container, item, size) type item[size]; | |
36 | ||
37 | #undef __dynamic_array | |
38 | #define __dynamic_array(type, item) type item[]; | |
39 | ||
40 | #undef F_STRUCT | |
41 | #define F_STRUCT(args...) args | |
42 | ||
43 | #undef F_printk | |
44 | #define F_printk(fmt, args...) fmt, args | |
45 | ||
46 | #undef FTRACE_ENTRY | |
47 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ | |
48 | struct ____ftrace_##name { \ | |
49 | tstruct \ | |
50 | }; \ | |
51 | static void __used ____ftrace_check_##name(void) \ | |
52 | { \ | |
53 | struct ____ftrace_##name *__entry = NULL; \ | |
54 | \ | |
55 | /* force cmpile-time check on F_printk() */ \ | |
56 | printk(print); \ | |
57 | } | |
58 | ||
59 | #undef FTRACE_ENTRY_DUP | |
60 | #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \ | |
61 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) | |
62 | ||
63 | #include "trace_entries.h" | |
64 | ||
65 | ||
4e5292ea SR |
66 | #undef __field |
67 | #define __field(type, item) \ | |
68 | ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \ | |
69 | "offset:%zu;\tsize:%zu;\n", \ | |
70 | offsetof(typeof(field), item), \ | |
71 | sizeof(field.item)); \ | |
72 | if (!ret) \ | |
73 | return 0; | |
75db37d2 | 74 | |
4e5292ea SR |
75 | #undef __field_desc |
76 | #define __field_desc(type, container, item) \ | |
da4d0302 | 77 | ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \ |
4e5292ea SR |
78 | "offset:%zu;\tsize:%zu;\n", \ |
79 | offsetof(typeof(field), container.item), \ | |
80 | sizeof(field.container.item)); \ | |
da4d0302 SR |
81 | if (!ret) \ |
82 | return 0; | |
83 | ||
4e5292ea SR |
84 | #undef __array |
85 | #define __array(type, item, len) \ | |
86 | ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ | |
87 | "offset:%zu;\tsize:%zu;\n", \ | |
88 | offsetof(typeof(field), item), \ | |
89 | sizeof(field.item)); \ | |
90 | if (!ret) \ | |
91 | return 0; | |
da4d0302 | 92 | |
4e5292ea SR |
93 | #undef __array_desc |
94 | #define __array_desc(type, container, item, len) \ | |
95 | ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ | |
96 | "offset:%zu;\tsize:%zu;\n", \ | |
97 | offsetof(typeof(field), container.item), \ | |
98 | sizeof(field.container.item)); \ | |
da4d0302 SR |
99 | if (!ret) \ |
100 | return 0; | |
770cb243 | 101 | |
4e5292ea SR |
102 | #undef __dynamic_array |
103 | #define __dynamic_array(type, item) \ | |
104 | ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \ | |
105 | "offset:%zu;\tsize:0;\n", \ | |
106 | offsetof(typeof(field), item)); \ | |
156b5f17 | 107 | if (!ret) \ |
770cb243 SR |
108 | return 0; |
109 | ||
4e5292ea SR |
110 | #undef F_printk |
111 | #define F_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args) | |
770cb243 | 112 | |
4e5292ea SR |
113 | #undef __entry |
114 | #define __entry REC | |
770cb243 | 115 | |
4e5292ea SR |
116 | #undef FTRACE_ENTRY |
117 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ | |
770cb243 | 118 | static int \ |
4e5292ea SR |
119 | ftrace_format_##name(struct ftrace_event_call *unused, \ |
120 | struct trace_seq *s) \ | |
770cb243 | 121 | { \ |
4e5292ea SR |
122 | struct struct_name field __attribute__((unused)); \ |
123 | int ret = 0; \ | |
770cb243 SR |
124 | \ |
125 | tstruct; \ | |
126 | \ | |
4e5292ea | 127 | trace_seq_printf(s, "\nprint fmt: " print); \ |
770cb243 SR |
128 | \ |
129 | return ret; \ | |
130 | } | |
131 | ||
4e5292ea SR |
132 | #include "trace_entries.h" |
133 | ||
134 | ||
135 | #undef __field | |
136 | #define __field(type, item) \ | |
137 | ret = trace_define_field(event_call, #type, #item, \ | |
138 | offsetof(typeof(field), item), \ | |
139 | sizeof(field.item), \ | |
140 | is_signed_type(type), FILTER_OTHER); \ | |
141 | if (ret) \ | |
142 | return ret; | |
143 | ||
144 | #undef __field_desc | |
145 | #define __field_desc(type, container, item) \ | |
146 | ret = trace_define_field(event_call, #type, #item, \ | |
147 | offsetof(typeof(field), \ | |
148 | container.item), \ | |
149 | sizeof(field.container.item), \ | |
150 | is_signed_type(type), FILTER_OTHER); \ | |
151 | if (ret) \ | |
152 | return ret; | |
153 | ||
154 | #undef __array | |
155 | #define __array(type, item, len) \ | |
156 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ | |
157 | ret = trace_define_field(event_call, #type "[" #len "]", #item, \ | |
158 | offsetof(typeof(field), item), \ | |
159 | sizeof(field.item), 0, FILTER_OTHER); \ | |
160 | if (ret) \ | |
161 | return ret; | |
162 | ||
163 | #undef __array_desc | |
164 | #define __array_desc(type, container, item, len) \ | |
165 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ | |
166 | ret = trace_define_field(event_call, #type "[" #len "]", #item, \ | |
167 | offsetof(typeof(field), \ | |
168 | container.item), \ | |
169 | sizeof(field.container.item), 0, \ | |
170 | FILTER_OTHER); \ | |
171 | if (ret) \ | |
172 | return ret; | |
173 | ||
174 | #undef __dynamic_array | |
175 | #define __dynamic_array(type, item) | |
176 | ||
177 | #undef FTRACE_ENTRY | |
178 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ | |
179 | int \ | |
180 | ftrace_define_fields_##name(struct ftrace_event_call *event_call) \ | |
e45f2e2b | 181 | { \ |
4e5292ea | 182 | struct struct_name field; \ |
e45f2e2b TZ |
183 | int ret; \ |
184 | \ | |
4e5292ea SR |
185 | ret = trace_define_common_fields(event_call); \ |
186 | if (ret) \ | |
187 | return ret; \ | |
e45f2e2b | 188 | \ |
4e5292ea | 189 | tstruct; \ |
e45f2e2b TZ |
190 | \ |
191 | return ret; \ | |
192 | } | |
193 | ||
4e5292ea SR |
194 | #include "trace_entries.h" |
195 | ||
196 | ||
197 | #undef __field | |
198 | #define __field(type, item) | |
199 | ||
200 | #undef __field_desc | |
201 | #define __field_desc(type, container, item) | |
202 | ||
203 | #undef __array | |
204 | #define __array(type, item, len) | |
205 | ||
206 | #undef __array_desc | |
207 | #define __array_desc(type, container, item, len) | |
208 | ||
209 | #undef __dynamic_array | |
210 | #define __dynamic_array(type, item) | |
211 | ||
4e5292ea SR |
212 | #undef FTRACE_ENTRY |
213 | #define FTRACE_ENTRY(call, struct_name, type, tstruct, print) \ | |
e1112b4d | 214 | static int ftrace_raw_init_event_##call(void); \ |
770cb243 | 215 | \ |
e1112b4d | 216 | struct ftrace_event_call __used \ |
770cb243 SR |
217 | __attribute__((__aligned__(4))) \ |
218 | __attribute__((section("_ftrace_events"))) event_##call = { \ | |
ef18012b | 219 | .name = #call, \ |
4e5292ea | 220 | .id = type, \ |
770cb243 | 221 | .system = __stringify(TRACE_SYSTEM), \ |
e1112b4d | 222 | .raw_init = ftrace_raw_init_event_##call, \ |
770cb243 | 223 | .show_format = ftrace_format_##call, \ |
e1112b4d TZ |
224 | .define_fields = ftrace_define_fields_##call, \ |
225 | }; \ | |
226 | static int ftrace_raw_init_event_##call(void) \ | |
227 | { \ | |
228 | INIT_LIST_HEAD(&event_##call.fields); \ | |
229 | return 0; \ | |
230 | } \ | |
231 | ||
4e5292ea | 232 | #include "trace_entries.h" |