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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 | }; \ | |
5e9b3972 | 51 | static void __always_unused ____ftrace_check_##name(void) \ |
05ffa2d0 LZ |
52 | { \ |
53 | struct ____ftrace_##name *__entry = NULL; \ | |
54 | \ | |
5e9b3972 | 55 | /* force compile-time check on F_printk() */ \ |
05ffa2d0 LZ |
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" \ | |
26a50744 | 69 | "offset:%zu;\tsize:%zu;\tsigned:%u;\n", \ |
4e5292ea | 70 | offsetof(typeof(field), item), \ |
26a50744 | 71 | sizeof(field.item), is_signed_type(type)); \ |
4e5292ea SR |
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" \ |
26a50744 | 78 | "offset:%zu;\tsize:%zu;\tsigned:%u;\n", \ |
4e5292ea | 79 | offsetof(typeof(field), container.item), \ |
26a50744 TZ |
80 | sizeof(field.container.item), \ |
81 | is_signed_type(type)); \ | |
da4d0302 SR |
82 | if (!ret) \ |
83 | return 0; | |
84 | ||
4e5292ea SR |
85 | #undef __array |
86 | #define __array(type, item, len) \ | |
87 | ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ | |
26a50744 TZ |
88 | "offset:%zu;\tsize:%zu;\tsigned:%u;\n", \ |
89 | offsetof(typeof(field), item), \ | |
90 | sizeof(field.item), is_signed_type(type)); \ | |
4e5292ea SR |
91 | if (!ret) \ |
92 | return 0; | |
da4d0302 | 93 | |
4e5292ea SR |
94 | #undef __array_desc |
95 | #define __array_desc(type, container, item, len) \ | |
96 | ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ | |
26a50744 | 97 | "offset:%zu;\tsize:%zu;\tsigned:%u;\n", \ |
4e5292ea | 98 | offsetof(typeof(field), container.item), \ |
26a50744 TZ |
99 | sizeof(field.container.item), \ |
100 | is_signed_type(type)); \ | |
da4d0302 SR |
101 | if (!ret) \ |
102 | return 0; | |
770cb243 | 103 | |
4e5292ea SR |
104 | #undef __dynamic_array |
105 | #define __dynamic_array(type, item) \ | |
106 | ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \ | |
26a50744 TZ |
107 | "offset:%zu;\tsize:0;\tsigned:%u;\n", \ |
108 | offsetof(typeof(field), item), \ | |
109 | is_signed_type(type)); \ | |
156b5f17 | 110 | if (!ret) \ |
770cb243 SR |
111 | return 0; |
112 | ||
4e5292ea SR |
113 | #undef F_printk |
114 | #define F_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args) | |
770cb243 | 115 | |
4e5292ea SR |
116 | #undef __entry |
117 | #define __entry REC | |
770cb243 | 118 | |
4e5292ea SR |
119 | #undef FTRACE_ENTRY |
120 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ | |
770cb243 | 121 | static int \ |
4e5292ea SR |
122 | ftrace_format_##name(struct ftrace_event_call *unused, \ |
123 | struct trace_seq *s) \ | |
770cb243 | 124 | { \ |
4e5292ea SR |
125 | struct struct_name field __attribute__((unused)); \ |
126 | int ret = 0; \ | |
770cb243 SR |
127 | \ |
128 | tstruct; \ | |
129 | \ | |
4e5292ea | 130 | trace_seq_printf(s, "\nprint fmt: " print); \ |
770cb243 SR |
131 | \ |
132 | return ret; \ | |
133 | } | |
134 | ||
4e5292ea SR |
135 | #include "trace_entries.h" |
136 | ||
4e5292ea SR |
137 | #undef __field |
138 | #define __field(type, item) \ | |
139 | ret = trace_define_field(event_call, #type, #item, \ | |
140 | offsetof(typeof(field), item), \ | |
141 | sizeof(field.item), \ | |
142 | is_signed_type(type), FILTER_OTHER); \ | |
143 | if (ret) \ | |
144 | return ret; | |
145 | ||
146 | #undef __field_desc | |
147 | #define __field_desc(type, container, item) \ | |
148 | ret = trace_define_field(event_call, #type, #item, \ | |
149 | offsetof(typeof(field), \ | |
150 | container.item), \ | |
151 | sizeof(field.container.item), \ | |
152 | is_signed_type(type), FILTER_OTHER); \ | |
153 | if (ret) \ | |
154 | return ret; | |
155 | ||
156 | #undef __array | |
157 | #define __array(type, item, len) \ | |
158 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ | |
159 | ret = trace_define_field(event_call, #type "[" #len "]", #item, \ | |
160 | offsetof(typeof(field), item), \ | |
161 | sizeof(field.item), 0, FILTER_OTHER); \ | |
162 | if (ret) \ | |
163 | return ret; | |
164 | ||
165 | #undef __array_desc | |
166 | #define __array_desc(type, container, item, len) \ | |
167 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ | |
168 | ret = trace_define_field(event_call, #type "[" #len "]", #item, \ | |
169 | offsetof(typeof(field), \ | |
170 | container.item), \ | |
171 | sizeof(field.container.item), 0, \ | |
172 | FILTER_OTHER); \ | |
173 | if (ret) \ | |
174 | return ret; | |
175 | ||
176 | #undef __dynamic_array | |
177 | #define __dynamic_array(type, item) | |
178 | ||
179 | #undef FTRACE_ENTRY | |
180 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ | |
181 | int \ | |
182 | ftrace_define_fields_##name(struct ftrace_event_call *event_call) \ | |
e45f2e2b | 183 | { \ |
4e5292ea | 184 | struct struct_name field; \ |
e45f2e2b TZ |
185 | int ret; \ |
186 | \ | |
4e5292ea | 187 | tstruct; \ |
e45f2e2b TZ |
188 | \ |
189 | return ret; \ | |
190 | } | |
191 | ||
4e5292ea SR |
192 | #include "trace_entries.h" |
193 | ||
d7a4b414 FW |
194 | static int ftrace_raw_init_event(struct ftrace_event_call *call) |
195 | { | |
196 | INIT_LIST_HEAD(&call->fields); | |
197 | return 0; | |
198 | } | |
4e5292ea SR |
199 | |
200 | #undef __field | |
201 | #define __field(type, item) | |
202 | ||
203 | #undef __field_desc | |
204 | #define __field_desc(type, container, item) | |
205 | ||
206 | #undef __array | |
207 | #define __array(type, item, len) | |
208 | ||
209 | #undef __array_desc | |
210 | #define __array_desc(type, container, item, len) | |
211 | ||
212 | #undef __dynamic_array | |
213 | #define __dynamic_array(type, item) | |
214 | ||
4e5292ea SR |
215 | #undef FTRACE_ENTRY |
216 | #define FTRACE_ENTRY(call, struct_name, type, tstruct, print) \ | |
770cb243 | 217 | \ |
e1112b4d | 218 | struct ftrace_event_call __used \ |
770cb243 SR |
219 | __attribute__((__aligned__(4))) \ |
220 | __attribute__((section("_ftrace_events"))) event_##call = { \ | |
ef18012b | 221 | .name = #call, \ |
4e5292ea | 222 | .id = type, \ |
770cb243 | 223 | .system = __stringify(TRACE_SYSTEM), \ |
d7a4b414 | 224 | .raw_init = ftrace_raw_init_event, \ |
770cb243 | 225 | .show_format = ftrace_format_##call, \ |
e1112b4d TZ |
226 | .define_fields = ftrace_define_fields_##call, \ |
227 | }; \ | |
e1112b4d | 228 | |
4e5292ea | 229 | #include "trace_entries.h" |