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 trace_seq *s)                               \
  64 {                                                                       \
  65         struct args field;                                              \
  66         int ret;                                                        \
  67                                                                         \
  68         tstruct;                                                        \
  69                                                                         \
  70         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  71                                                                         \
  72         return ret;                                                     \
  73 }
  74
  75 #undef TRACE_EVENT_FORMAT_NOFILTER
  76 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
  77                                     tpfmt)                              \
  78 static int                                                              \
  79 ftrace_format_##call(struct trace_seq *s)                               \
  80 {                                                                       \
  81         struct args field;                                              \
  82         int ret;                                                        \
  83                                                                         \
  84         tstruct;                                                        \
  85                                                                         \
  86         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  87                                                                         \
  88         return ret;                                                     \
  89 }
  90
  91 #include "trace_event_types.h"
  92
  93 #undef TRACE_ZERO_CHAR
  94 #define TRACE_ZERO_CHAR(arg)
  95
  96 #undef TRACE_FIELD
  97 #define TRACE_FIELD(type, item, assign)\
  98         entry->item = assign;
  99
 100 #undef TRACE_FIELD
 101 #define TRACE_FIELD(type, item, assign)\
 102         entry->item = assign;
 103
 104 #undef TRACE_FIELD_SIGN
 105 #define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
 106         TRACE_FIELD(type, item, assign)
 107
 108 #undef TP_CMD
 109 #define TP_CMD(cmd...)  cmd
 110
 111 #undef TRACE_ENTRY
 112 #define TRACE_ENTRY     entry
 113
 114 #undef TRACE_FIELD_SPECIAL
 115 #define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)  \
 116         cmd;
 117
 118 #undef TRACE_EVENT_FORMAT
 119 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 120 int ftrace_define_fields_##call(void);                                  \
 121 static int ftrace_raw_init_event_##call(void);                          \
 122                                                                         \
 123 struct ftrace_event_call __used                                         \
 124 __attribute__((__aligned__(4)))                                         \
 125 __attribute__((section("_ftrace_events"))) event_##call = {             \
 126         .name                   = #call,                                \
 127         .id                     = proto,                                \
 128         .system                 = __stringify(TRACE_SYSTEM),            \
 129         .raw_init               = ftrace_raw_init_event_##call,         \
 130         .show_format            = ftrace_format_##call,                 \
 131         .define_fields          = ftrace_define_fields_##call,          \
 132 };                                                                      \
 133 static int ftrace_raw_init_event_##call(void)                           \
 134 {                                                                       \
 135         INIT_LIST_HEAD(&event_##call.fields);                           \
 136         init_preds(&event_##call);                                      \
 137         return 0;                                                       \
 138 }                                                                       \
 139
 140 #undef TRACE_EVENT_FORMAT_NOFILTER
 141 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 142                                     tpfmt)                              \
 143                                                                         \
 144 struct ftrace_event_call __used                                         \
 145 __attribute__((__aligned__(4)))                                         \
 146 __attribute__((section("_ftrace_events"))) event_##call = {             \
 147         .name                   = #call,                                \
 148         .id                     = proto,                                \
 149         .system                 = __stringify(TRACE_SYSTEM),            \
 150         .show_format            = ftrace_format_##call,                 \
 151 };
 152
 153 #include "trace_event_types.h"
 154
 155 #undef TRACE_FIELD
 156 #define TRACE_FIELD(type, item, assign)                                 \
 157         ret = trace_define_field(event_call, #type, #item,              \
 158                                  offsetof(typeof(field), item),         \
 159                                  sizeof(field.item), is_signed_type(type));     \
 160         if (ret)                                                        \
 161                 return ret;
 162
 163 #undef TRACE_FIELD_SPECIAL
 164 #define TRACE_FIELD_SPECIAL(type, item, len, cmd)                       \
 165         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 166                                  offsetof(typeof(field), item),         \
 167                                  sizeof(field.item), 0);                \
 168         if (ret)                                                        \
 169                 return ret;
 170
 171 #undef TRACE_FIELD_SIGN
 172 #define TRACE_FIELD_SIGN(type, item, assign, is_signed)                 \
 173         ret = trace_define_field(event_call, #type, #item,              \
 174                                  offsetof(typeof(field), item),         \
 175                                  sizeof(field.item), is_signed);        \
 176         if (ret)                                                        \
 177                 return ret;
 178
 179 #undef TRACE_FIELD_ZERO_CHAR
 180 #define TRACE_FIELD_ZERO_CHAR(item)
 181
 182 #undef TRACE_EVENT_FORMAT
 183 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 184 int                                                                     \
 185 ftrace_define_fields_##call(void)                                       \
 186 {                                                                       \
 187         struct ftrace_event_call *event_call = &event_##call;           \
 188         struct args field;                                              \
 189         int ret;                                                        \
 190                                                                         \
 191         __common_field(unsigned char, type, 0);                         \
 192         __common_field(unsigned char, flags, 0);                        \
 193         __common_field(unsigned char, preempt_count, 0);                \
 194         __common_field(int, pid, 1);                                    \
 195         __common_field(int, tgid, 1);                                   \
 196                                                                         \
 197         tstruct;                                                        \
 198                                                                         \
 199         return ret;                                                     \
 200 }
 201
 202 #undef TRACE_EVENT_FORMAT_NOFILTER
 203 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 204                                     tpfmt)
 205
 206 #include "trace_event_types.h"