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   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 #include "trace_format.h"
  19
  20 #undef TRACE_FIELD_ZERO_CHAR
  21 #define TRACE_FIELD_ZERO_CHAR(item)                                     \
  22         ret = trace_seq_printf(s, "\tfield: char " #item ";\t"          \
  23                                "offset:%u;\tsize:0;\n",                 \
  24                                (unsigned int)offsetof(typeof(field), item)); \
  25         if (!ret)                                                       \
  26                 return 0;
  27
  28
  29 #undef TPRAWFMT
  30 #define TPRAWFMT(args...) args
  31
  32 #undef TRACE_EVENT_FORMAT
  33 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
  34 static int                                                              \
  35 ftrace_format_##call(struct trace_seq *s)                               \
  36 {                                                                       \
  37         struct args field;                                              \
  38         int ret;                                                        \
  39                                                                         \
  40         tstruct;                                                        \
  41                                                                         \
  42         trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
  43                                                                         \
  44         return ret;                                                     \
  45 }
  46
  47 #include "trace_event_types.h"
  48
  49 #undef TRACE_ZERO_CHAR
  50 #define TRACE_ZERO_CHAR(arg)
  51
  52 #undef TRACE_FIELD
  53 #define TRACE_FIELD(type, item, assign)\
  54         entry->item = assign;
  55
  56 #undef TRACE_FIELD
  57 #define TRACE_FIELD(type, item, assign)\
  58         entry->item = assign;
  59
  60 #undef TPCMD
  61 #define TPCMD(cmd...)   cmd
  62
  63 #undef TRACE_ENTRY
  64 #define TRACE_ENTRY     entry
  65
  66 #undef TRACE_FIELD_SPECIAL
  67 #define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
  68         cmd;
  69
  70 #undef TRACE_EVENT_FORMAT
  71 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
  72                                                                         \
  73 static struct ftrace_event_call __used                                  \
  74 __attribute__((__aligned__(4)))                                         \
  75 __attribute__((section("_ftrace_events"))) event_##call = {             \
  76         .name                   = #call,                                \
  77         .id                     = proto,                                \
  78         .system                 = __stringify(TRACE_SYSTEM),            \
  79         .show_format            = ftrace_format_##call,                 \
  80 }
  81 #include "trace_event_types.h"