tracing: new format for specialized trace points
[linux-2.6.git] / 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, 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 #include "trace_event_types.h"
69
70 #undef TRACE_ZERO_CHAR
71 #define TRACE_ZERO_CHAR(arg)
72
73 #undef TRACE_FIELD
74 #define TRACE_FIELD(type, item, assign)\
75         entry->item = assign;
76
77 #undef TRACE_FIELD
78 #define TRACE_FIELD(type, item, assign)\
79         entry->item = assign;
80
81 #undef TP_CMD
82 #define TP_CMD(cmd...)  cmd
83
84 #undef TRACE_ENTRY
85 #define TRACE_ENTRY     entry
86
87 #undef TRACE_FIELD_SPECIAL
88 #define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
89         cmd;
90
91 #undef TRACE_EVENT_FORMAT
92 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
93                                                                         \
94 static struct ftrace_event_call __used                                  \
95 __attribute__((__aligned__(4)))                                         \
96 __attribute__((section("_ftrace_events"))) event_##call = {             \
97         .name                   = #call,                                \
98         .id                     = proto,                                \
99         .system                 = __stringify(TRACE_SYSTEM),            \
100         .show_format            = ftrace_format_##call,                 \
101 }
102 #include "trace_event_types.h"