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 /* not needed for this file */ 22 #undef __field_struct 23 #define __field_struct(type, item) 24 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 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; 74 75 #undef __field_desc 76 #define __field_desc(type, container, item) \ 77 ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \ 78 "offset:%zu;\tsize:%zu;\n", \ 79 offsetof(typeof(field), container.item), \ 80 sizeof(field.container.item)); \ 81 if (!ret) \ 82 return 0; 83 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; 92 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)); \ 99 if (!ret) \ 100 return 0; 101 102 #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)); \ 107 if (!ret) \ 108 return 0; 109 110 #undef F_printk 111 #define F_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args) 112 113 #undef __entry 114 #define __entry REC 115 116 #undef FTRACE_ENTRY 117 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 118 static int \ 119 ftrace_format_##name(struct ftrace_event_call *unused, \ 120 struct trace_seq *s) \ 121 { \ 122 struct struct_name field __attribute__((unused)); \ 123 int ret = 0; \ 124 \ 125 tstruct; \ 126 \ 127 trace_seq_printf(s, "\nprint fmt: " print); \ 128 \ 129 return ret; \ 130 } 131 132 #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) \ 181 { \ 182 struct struct_name field; \ 183 int ret; \ 184 \ 185 ret = trace_define_common_fields(event_call); \ 186 if (ret) \ 187 return ret; \ 188 \ 189 tstruct; \ 190 \ 191 return ret; \ 192 } 193 194 #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) 211 212 #undef FTRACE_ENTRY 213 #define FTRACE_ENTRY(call, struct_name, type, tstruct, print) \ 214 static int ftrace_raw_init_event_##call(void); \ 215 \ 216 struct ftrace_event_call __used \ 217 __attribute__((__aligned__(4))) \ 218 __attribute__((section("_ftrace_events"))) event_##call = { \ 219 .name = #call, \ 220 .id = type, \ 221 .system = __stringify(TRACE_SYSTEM), \ 222 .raw_init = ftrace_raw_init_event_##call, \ 223 .show_format = ftrace_format_##call, \ 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 } \ 231 232 #include "trace_entries.h" 233