kernel/trace/trace_export.c

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