SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #undef TRACE_FIELD
  23 #define TRACE_FIELD(type, item, assign)                                 \
  24         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
  25                                "offset:%u;\tsize:%u;\n",                \
  26                                (unsigned int)offsetof(typeof(field), item), \
  27                                (unsigned int)sizeof(field.item));       \
  28         if (!ret)                                                       \
  29                 return 0;
  30
  31
  32 #undef TRACE_FIELD_SPECIAL
  33 #define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)                  \
  34         ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t"   \
  35                                "offset:%u;\tsize:%u;\n",                \
  36                                (unsigned int)offsetof(typeof(field), item), \
  37                                (unsigned int)sizeof(field.item));       \
  38         if (!ret)                                                       \
  39                 return 0;
  40
  41 #undef TRACE_FIELD_ZERO_CHAR
  42 #define TRACE_FIELD_ZERO_CHAR(item)                                     \
  43         ret = trace_seq_printf(s, "\tfield:char " #item ";\t"           \
  44                                "offset:%u;\tsize:0;\n",                 \
  45                                (unsigned int)offsetof(typeof(field), item)); \
  46         if (!ret)                                                       \
  47                 return 0;
  48
  49
  50 #undef TP_RAW_FMT
  51 #define TP_RAW_FMT(args...) args
  52
  53 #undef TRACE_EVENT_FORMAT
  54 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
  55 static int                                                              \
  56 ftrace_format_##call(struct trace_seq *s)                               \
  57 {                                                                       \
  58         struct args field;                                              \
  59         int ret;                                                        \
  60                                                                         \
  61         tstruct;                                                        \
  62                                                                         \
  63         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  64                                                                         \
  65         return ret;                                                     \
  66 }
  67
  68 #undef TRACE_EVENT_FORMAT_NOFILTER
  69 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
  70                                     tpfmt)                              \
  71 static int                                                              \
  72 ftrace_format_##call(struct trace_seq *s)                               \
  73 {                                                                       \
  74         struct args field;                                              \
  75         int ret;                                                        \
  76                                                                         \
  77         tstruct;                                                        \
  78                                                                         \
  79         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  80                                                                         \
  81         return ret;                                                     \
  82 }
  83
  84 #include "trace_event_types.h"
  85
  86 #undef TRACE_ZERO_CHAR
  87 #define TRACE_ZERO_CHAR(arg)
  88
  89 #undef TRACE_FIELD
  90 #define TRACE_FIELD(type, item, assign)\
  91         entry->item = assign;
  92
  93 #undef TRACE_FIELD
  94 #define TRACE_FIELD(type, item, assign)\
  95         entry->item = assign;
  96
  97 #undef TP_CMD
  98 #define TP_CMD(cmd...)  cmd
  99
 100 #undef TRACE_ENTRY
 101 #define TRACE_ENTRY     entry
 102
 103 #undef TRACE_FIELD_SPECIAL
 104 #define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)  \
 105         cmd;
 106
 107 #undef TRACE_EVENT_FORMAT
 108 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 109 int ftrace_define_fields_##call(void);                                  \
 110 static int ftrace_raw_init_event_##call(void);                          \
 111                                                                         \
 112 struct ftrace_event_call __used                                         \
 113 __attribute__((__aligned__(4)))                                         \
 114 __attribute__((section("_ftrace_events"))) event_##call = {             \
 115         .name                   = #call,                                \
 116         .id                     = proto,                                \
 117         .system                 = __stringify(TRACE_SYSTEM),            \
 118         .raw_init               = ftrace_raw_init_event_##call,         \
 119         .show_format            = ftrace_format_##call,                 \
 120         .define_fields          = ftrace_define_fields_##call,          \
 121 };                                                                      \
 122 static int ftrace_raw_init_event_##call(void)                           \
 123 {                                                                       \
 124         INIT_LIST_HEAD(&event_##call.fields);                           \
 125         return 0;                                                       \
 126 }                                                                       \
 127
 128 #undef TRACE_EVENT_FORMAT_NOFILTER
 129 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 130                                     tpfmt)                              \
 131                                                                         \
 132 struct ftrace_event_call __used                                         \
 133 __attribute__((__aligned__(4)))                                         \
 134 __attribute__((section("_ftrace_events"))) event_##call = {             \
 135         .name                   = #call,                                \
 136         .id                     = proto,                                \
 137         .system                 = __stringify(TRACE_SYSTEM),            \
 138         .show_format            = ftrace_format_##call,                 \
 139 };
 140
 141 #include "trace_event_types.h"
 142
 143 #undef TRACE_FIELD
 144 #define TRACE_FIELD(type, item, assign)                                 \
 145         ret = trace_define_field(event_call, #type, #item,              \
 146                                  offsetof(typeof(field), item),         \
 147                                  sizeof(field.item));                   \
 148         if (ret)                                                        \
 149                 return ret;
 150
 151 #undef TRACE_FIELD_SPECIAL
 152 #define TRACE_FIELD_SPECIAL(type, item, len, cmd)                       \
 153         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 154                                  offsetof(typeof(field), item),         \
 155                                  sizeof(field.item));                   \
 156         if (ret)                                                        \
 157                 return ret;
 158
 159 #undef TRACE_FIELD_ZERO_CHAR
 160 #define TRACE_FIELD_ZERO_CHAR(item)
 161
 162 #undef TRACE_EVENT_FORMAT
 163 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 164 int                                                                     \
 165 ftrace_define_fields_##call(void)                                       \
 166 {                                                                       \
 167         struct ftrace_event_call *event_call = &event_##call;           \
 168         struct args field;                                              \
 169         int ret;                                                        \
 170                                                                         \
 171         __common_field(unsigned char, type);                            \
 172         __common_field(unsigned char, flags);                           \
 173         __common_field(unsigned char, preempt_count);                   \
 174         __common_field(int, pid);                                       \
 175         __common_field(int, tgid);                                      \
 176                                                                         \
 177         tstruct;                                                        \
 178                                                                         \
 179         return ret;                                                     \
 180 }
 181
 182 #undef TRACE_EVENT_FORMAT_NOFILTER
 183 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
 184                                     tpfmt)
 185
 186 #include "trace_event_types.h"