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
  19 #undef TRACE_STRUCT
  20 #define TRACE_STRUCT(args...) args
  21
  22 extern void __bad_type_size(void);
  23
  24 #undef TRACE_FIELD
  25 #define TRACE_FIELD(type, item, assign)                                 \
  26         if (sizeof(type) != sizeof(field.item))                         \
  27                 __bad_type_size();                                      \
  28         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
  29                                "offset:%u;\tsize:%u;\n",                \
  30                                (unsigned int)offsetof(typeof(field), item), \
  31                                (unsigned int)sizeof(field.item));       \
  32         if (!ret)                                                       \
  33                 return 0;
  34
  35
  36 #undef TRACE_FIELD_SPECIAL
  37 #define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)                  \
  38         ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t"   \
  39                                "offset:%u;\tsize:%u;\n",                \
  40                                (unsigned int)offsetof(typeof(field), item), \
  41                                (unsigned int)sizeof(field.item));       \
  42         if (!ret)                                                       \
  43                 return 0;
  44
  45 #undef TRACE_FIELD_ZERO_CHAR
  46 #define TRACE_FIELD_ZERO_CHAR(item)                                     \
  47         ret = trace_seq_printf(s, "\tfield:char " #item ";\t"           \
  48                                "offset:%u;\tsize:0;\n",                 \
  49                                (unsigned int)offsetof(typeof(field), item)); \
  50         if (!ret)                                                       \
  51                 return 0;
  52
  53 #undef TRACE_FIELD_SIGN
  54 #define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
  55         TRACE_FIELD(type, item, assign)
  56
  57 #undef TP_RAW_FMT
  58 #define TP_RAW_FMT(args...) args
  59
  60 #undef TRACE_EVENT_FORMAT
  61 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
  62 static int                                                              \
  63 ftrace_format_##call(struct ftrace_event_call *unused,                  \
  64                       struct trace_seq *s)                              \
  65 {                                                                       \
  66         struct args field;                                              \
  67         int ret;                                                        \
  68                                                                         \
  69         tstruct;                                                        \
  70                                                                         \
  71         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  72                                                                         \
  73         return ret;                                                     \
  74 }
  75
  76 #undef TRACE_EVENT_FORMAT_NOFILTER
  77 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
  78                                     tpfmt)                              \
  79 static int                                                              \
  80 ftrace_format_##call(struct ftrace_event_call *unused,                  \
  81                       struct trace_seq *s)                              \
  82 {                                                                       \
  83         struct args field;                                              \
  84         int ret;                                                        \
  85                                                                         \
  86         tstruct;                                                        \
  87                                                                         \
  88         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  89                                                                         \
  90         return ret;                                                     \
  91 }
  92
  93 #include "trace_event_types.h"
  94
  95 #undef TRACE_ZERO_CHAR
  96 #define TRACE_ZERO_CHAR(arg)
  97
  98 #undef TRACE_FIELD
  99 #define TRACE_FIELD(type, item, assign)\
 100         entry->item = assign;
 101
 102 #undef TRACE_FIELD
 103 #define TRACE_FIELD(type, item, assign)\
 104         entry->item = assign;
 105
 106 #undef TRACE_FIELD_SIGN
 107 #define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
 108         TRACE_FIELD(type, item, assign)
 109
 110 #undef TP_CMD
 111 #define TP_CMD(cmd...)  cmd
 112
 113 #undef TRACE_ENTRY
 114 #define TRACE_ENTRY     entry
 115
 116 #undef TRACE_FIELD_SPECIAL
 117 #define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)  \
 118         cmd;
 119
 120 static int ftrace_raw_init_event(struct ftrace_event_call *event_call)
 121 {
 122         INIT_LIST_HEAD(&event_call->fields);
 123         init_preds(event_call);
 124         return 0;
 125 }
 126
 127 #undef TRACE_EVENT_FORMAT
 128 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 129 int ftrace_define_fields_##call(struct ftrace_event_call *event_call);  \
 130                                                                         \
 131 struct ftrace_event_call __used                                         \
 132 __attribute__((__aligned__(4)))                                         \
 133 __attribute__((section("_ftrace_events"))) event_##call = {             \
 134         .name                   = #call,                                \
 135         .id                     = proto,                                \
 136         .system                 = __stringify(TRACE_SYSTEM),            \
 137         .raw_init               = ftrace_raw_init_event,                \
 138         .show_format            = ftrace_format_##call,                 \
 139         .define_fields          = ftrace_define_fields_##call,          \
 140 };
 141
 142 #undef TRACE_EVENT_FORMAT_NOFILTER
 143 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 144                                     tpfmt)                              \
 145                                                                         \
 146 struct ftrace_event_call __used                                         \
 147 __attribute__((__aligned__(4)))                                         \
 148 __attribute__((section("_ftrace_events"))) event_##call = {             \
 149         .name                   = #call,                                \
 150         .id                     = proto,                                \
 151         .system                 = __stringify(TRACE_SYSTEM),            \
 152         .show_format            = ftrace_format_##call,                 \
 153 };
 154
 155 #include "trace_event_types.h"
 156
 157 #undef TRACE_FIELD
 158 #define TRACE_FIELD(type, item, assign)                                 \
 159         ret = trace_define_field(event_call, #type, #item,              \
 160                                  offsetof(typeof(field), item),         \
 161                                  sizeof(field.item),                    \
 162                                  is_signed_type(type), FILTER_OTHER);   \
 163         if (ret)                                                        \
 164                 return ret;
 165
 166 #undef TRACE_FIELD_SPECIAL
 167 #define TRACE_FIELD_SPECIAL(type, item, len, cmd)                       \
 168         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 169                                  offsetof(typeof(field), item),         \
 170                                  sizeof(field.item), 0, FILTER_OTHER);  \
 171         if (ret)                                                        \
 172                 return ret;
 173
 174 #undef TRACE_FIELD_SIGN
 175 #define TRACE_FIELD_SIGN(type, item, assign, is_signed)                 \
 176         ret = trace_define_field(event_call, #type, #item,              \
 177                                  offsetof(typeof(field), item),         \
 178                                  sizeof(field.item), is_signed,         \
 179                                  FILTER_OTHER);                         \
 180         if (ret)                                                        \
 181                 return ret;
 182
 183 #undef TRACE_FIELD_ZERO_CHAR
 184 #define TRACE_FIELD_ZERO_CHAR(item)
 185
 186 #undef TRACE_EVENT_FORMAT
 187 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 188 int                                                                     \
 189 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 190 {                                                                       \
 191         struct args field;                                              \
 192         int ret;                                                        \
 193                                                                         \
 194         ret = trace_define_common_fields(event_call);                   \
 195         if (ret)                                                        \
 196                 return ret;                                             \
 197                                                                         \
 198         tstruct;                                                        \
 199                                                                         \
 200         return ret;                                                     \
 201 }
 202
 203 #undef TRACE_EVENT_FORMAT_NOFILTER
 204 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 205                                     tpfmt)
 206
 207 #include "trace_event_types.h"