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 __always_unused ____ftrace_check_##name(void) \ 52 { \ 53 struct ____ftrace_##name *__entry = NULL; \ 54 \ 55 /* force compile-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;\tsigned:%u;\n", \ 70 offsetof(typeof(field), item), \ 71 sizeof(field.item), is_signed_type(type)); \ 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;\tsigned:%u;\n", \ 79 offsetof(typeof(field), container.item), \ 80 sizeof(field.container.item), \ 81 is_signed_type(type)); \ 82 if (!ret) \ 83 return 0; 84 85 #undef __array 86 #define __array(type, item, len) \ 87 ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ 88 "offset:%zu;\tsize:%zu;\tsigned:%u;\n", \ 89 offsetof(typeof(field), item), \ 90 sizeof(field.item), is_signed_type(type)); \ 91 if (!ret) \ 92 return 0; 93 94 #undef __array_desc 95 #define __array_desc(type, container, item, len) \ 96 ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ 97 "offset:%zu;\tsize:%zu;\tsigned:%u;\n", \ 98 offsetof(typeof(field), container.item), \ 99 sizeof(field.container.item), \ 100 is_signed_type(type)); \ 101 if (!ret) \ 102 return 0; 103 104 #undef __dynamic_array 105 #define __dynamic_array(type, item) \ 106 ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \ 107 "offset:%zu;\tsize:0;\tsigned:%u;\n", \ 108 offsetof(typeof(field), item), \ 109 is_signed_type(type)); \ 110 if (!ret) \ 111 return 0; 112 113 #undef F_printk 114 #define F_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args) 115 116 #undef __entry 117 #define __entry REC 118 119 #undef FTRACE_ENTRY 120 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 121 static int \ 122 ftrace_format_##name(struct ftrace_event_call *unused, \ 123 struct trace_seq *s) \ 124 { \ 125 struct struct_name field __attribute__((unused)); \ 126 int ret = 0; \ 127 \ 128 tstruct; \ 129 \ 130 trace_seq_printf(s, "\nprint fmt: " print); \ 131 \ 132 return ret; \ 133 } 134 135 #include "trace_entries.h" 136 137 #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) \ 183 { \ 184 struct struct_name field; \ 185 int ret; \ 186 \ 187 ret = trace_define_common_fields(event_call); \ 188 if (ret) \ 189 return ret; \ 190 \ 191 tstruct; \ 192 \ 193 return ret; \ 194 } 195 196 #include "trace_entries.h" 197 198 static int ftrace_raw_init_event(struct ftrace_event_call *call) 199 { 200 INIT_LIST_HEAD(&call->fields); 201 return 0; 202 } 203 204 #undef __field 205 #define __field(type, item) 206 207 #undef __field_desc 208 #define __field_desc(type, container, item) 209 210 #undef __array 211 #define __array(type, item, len) 212 213 #undef __array_desc 214 #define __array_desc(type, container, item, len) 215 216 #undef __dynamic_array 217 #define __dynamic_array(type, item) 218 219 #undef FTRACE_ENTRY 220 #define FTRACE_ENTRY(call, struct_name, type, tstruct, print) \ 221 \ 222 struct ftrace_event_call __used \ 223 __attribute__((__aligned__(4))) \ 224 __attribute__((section("_ftrace_events"))) event_##call = { \ 225 .name = #call, \ 226 .id = type, \ 227 .system = __stringify(TRACE_SYSTEM), \ 228 .raw_init = ftrace_raw_init_event, \ 229 .show_format = ftrace_format_##call, \ 230 .define_fields = ftrace_define_fields_##call, \ 231 }; \ 232 233 #include "trace_entries.h" 234