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
  54 #undef TP_RAW_FMT
  55 #define TP_RAW_FMT(args...) args
  56
  57 #undef TRACE_EVENT_FORMAT
  58 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
  59 static int                                                              \
  60 ftrace_format_##call(struct trace_seq *s)                               \
  61 {                                                                       \
  62         struct args field;                                              \
  63         int ret;                                                        \
  64                                                                         \
  65         tstruct;                                                        \
  66                                                                         \
  67         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  68                                                                         \
  69         return ret;                                                     \
  70 }
  71
  72 #undef TRACE_EVENT_FORMAT_NOFILTER
  73 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
  74                                     tpfmt)                              \
  75 static int                                                              \
  76 ftrace_format_##call(struct trace_seq *s)                               \
  77 {                                                                       \
  78         struct args field;                                              \
  79         int ret;                                                        \
  80                                                                         \
  81         tstruct;                                                        \
  82                                                                         \
  83         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  84                                                                         \
  85         return ret;                                                     \
  86 }
  87
  88 #include "trace_event_types.h"
  89
  90 #undef TRACE_ZERO_CHAR
  91 #define TRACE_ZERO_CHAR(arg)
  92
  93 #undef TRACE_FIELD
  94 #define TRACE_FIELD(type, item, assign)\
  95         entry->item = assign;
  96
  97 #undef TRACE_FIELD
  98 #define TRACE_FIELD(type, item, assign)\
  99         entry->item = assign;
 100
 101 #undef TP_CMD
 102 #define TP_CMD(cmd...)  cmd
 103
 104 #undef TRACE_ENTRY
 105 #define TRACE_ENTRY     entry
 106
 107 #undef TRACE_FIELD_SPECIAL
 108 #define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)  \
 109         cmd;
 110
 111 #undef TRACE_EVENT_FORMAT
 112 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 113 int ftrace_define_fields_##call(void);                                  \
 114 static int ftrace_raw_init_event_##call(void);                          \
 115                                                                         \
 116 struct ftrace_event_call __used                                         \
 117 __attribute__((__aligned__(4)))                                         \
 118 __attribute__((section("_ftrace_events"))) event_##call = {             \
 119         .name                   = #call,                                \
 120         .id                     = proto,                                \
 121         .system                 = __stringify(TRACE_SYSTEM),            \
 122         .raw_init               = ftrace_raw_init_event_##call,         \
 123         .show_format            = ftrace_format_##call,                 \
 124         .define_fields          = ftrace_define_fields_##call,          \
 125 };                                                                      \
 126 static int ftrace_raw_init_event_##call(void)                           \
 127 {                                                                       \
 128         INIT_LIST_HEAD(&event_##call.fields);                           \
 129         init_preds(&event_##call);                                      \
 130         return 0;                                                       \
 131 }                                                                       \
 132
 133 #undef TRACE_EVENT_FORMAT_NOFILTER
 134 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 135                                     tpfmt)                              \
 136                                                                         \
 137 struct ftrace_event_call __used                                         \
 138 __attribute__((__aligned__(4)))                                         \
 139 __attribute__((section("_ftrace_events"))) event_##call = {             \
 140         .name                   = #call,                                \
 141         .id                     = proto,                                \
 142         .system                 = __stringify(TRACE_SYSTEM),            \
 143         .show_format            = ftrace_format_##call,                 \
 144 };
 145
 146 #include "trace_event_types.h"
 147
 148 #undef TRACE_FIELD
 149 #define TRACE_FIELD(type, item, assign)                                 \
 150         ret = trace_define_field(event_call, #type, #item,              \
 151                                  offsetof(typeof(field), item),         \
 152                                  sizeof(field.item));                   \
 153         if (ret)                                                        \
 154                 return ret;
 155
 156 #undef TRACE_FIELD_SPECIAL
 157 #define TRACE_FIELD_SPECIAL(type, item, len, cmd)                       \
 158         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 159                                  offsetof(typeof(field), item),         \
 160                                  sizeof(field.item));                   \
 161         if (ret)                                                        \
 162                 return ret;
 163
 164 #undef TRACE_FIELD_ZERO_CHAR
 165 #define TRACE_FIELD_ZERO_CHAR(item)
 166
 167 #undef TRACE_EVENT_FORMAT
 168 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 169 int                                                                     \
 170 ftrace_define_fields_##call(void)                                       \
 171 {                                                                       \
 172         struct ftrace_event_call *event_call = &event_##call;           \
 173         struct args field;                                              \
 174         int ret;                                                        \
 175                                                                         \
 176         __common_field(unsigned char, type);                            \
 177         __common_field(unsigned char, flags);                           \
 178         __common_field(unsigned char, preempt_count);                   \
 179         __common_field(int, pid);                                       \
 180         __common_field(int, tgid);                                      \
 181                                                                         \
 182         tstruct;                                                        \
 183                                                                         \
 184         return ret;                                                     \
 185 }
 186
 187 #undef TRACE_EVENT_FORMAT_NOFILTER
 188 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 189                                     tpfmt)
 190
 191 #include "trace_event_types.h"