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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace_export.c - export basic ftrace utilities to user space
4 *
5 * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
6 */
7#include <linux/stringify.h>
8#include <linux/kallsyms.h>
9#include <linux/seq_file.h>
10#include <linux/uaccess.h>
11#include <linux/ftrace.h>
12#include <linux/module.h>
13#include <linux/init.h>
14
15#include "trace_output.h"
16
17/* Stub function for events with triggers */
18static int ftrace_event_register(struct trace_event_call *call,
19 enum trace_reg type, void *data)
20{
21 return 0;
22}
23
24#undef TRACE_SYSTEM
25#define TRACE_SYSTEM ftrace
26
27/*
28 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
29 * function and thus become accessible via perf.
30 */
31#undef FTRACE_ENTRY_REG
32#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
33 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
34
35/* not needed for this file */
36#undef __field_struct
37#define __field_struct(type, item)
38
39#undef __field
40#define __field(type, item) type item;
41
42#undef __field_fn
43#define __field_fn(type, item) type item;
44
45#undef __field_desc
46#define __field_desc(type, container, item) type item;
47
48#undef __field_packed
49#define __field_packed(type, container, item) type item;
50
51#undef __array
52#define __array(type, item, size) type item[size];
53
54#undef __array_desc
55#define __array_desc(type, container, item, size) type item[size];
56
57#undef __dynamic_array
58#define __dynamic_array(type, item) type item[];
59
60#undef F_STRUCT
61#define F_STRUCT(args...) args
62
63#undef F_printk
64#define F_printk(fmt, args...) fmt, args
65
66#undef FTRACE_ENTRY
67#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
68struct ____ftrace_##name { \
69 tstruct \
70}; \
71static void __always_unused ____ftrace_check_##name(void) \
72{ \
73 struct ____ftrace_##name *__entry = NULL; \
74 \
75 /* force compile-time check on F_printk() */ \
76 printk(print); \
77}
78
79#undef FTRACE_ENTRY_DUP
80#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \
81 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
82
83#include "trace_entries.h"
84
85#undef __field_ext
86#define __field_ext(_type, _item, _filter_type) { \
87 .type = #_type, .name = #_item, \
88 .size = sizeof(_type), .align = __alignof__(_type), \
89 is_signed_type(_type), .filter_type = _filter_type },
90
91
92#undef __field_ext_packed
93#define __field_ext_packed(_type, _item, _filter_type) { \
94 .type = #_type, .name = #_item, \
95 .size = sizeof(_type), .align = 1, \
96 is_signed_type(_type), .filter_type = _filter_type },
97
98#undef __field
99#define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER)
100
101#undef __field_fn
102#define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN)
103
104#undef __field_desc
105#define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER)
106
107#undef __field_packed
108#define __field_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER)
109
110#undef __array
111#define __array(_type, _item, _len) { \
112 .type = #_type"["__stringify(_len)"]", .name = #_item, \
113 .size = sizeof(_type[_len]), .align = __alignof__(_type), \
114 is_signed_type(_type), .filter_type = FILTER_OTHER, \
115 .len = _len },
116
117#undef __array_desc
118#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)
119
120#undef __dynamic_array
121#define __dynamic_array(_type, _item) { \
122 .type = #_type "[]", .name = #_item, \
123 .size = 0, .align = __alignof__(_type), \
124 is_signed_type(_type), .filter_type = FILTER_OTHER },
125
126#undef FTRACE_ENTRY
127#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
128static struct trace_event_fields ftrace_event_fields_##name[] = { \
129 tstruct \
130 {} };
131
132#include "__KEEPIDENTS__BCG.h"
133
134#undef __entry
135#define __entry REC
136
137#undef __field
138#define __field(type, item)
139
140#undef __field_fn
141#define __field_fn(type, item)
142
143#undef __field_desc
144#define __field_desc(type, container, item)
145
146#undef __field_packed
147#define __field_packed(type, container, item)
148
149#undef __array
150#define __array(type, item, len)
151
152#undef __array_desc
153#define __array_desc(type, container, item, len)
154
155#undef __dynamic_array
156#define __dynamic_array(type, item)
157
158#undef F_printk
159#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
160
161#undef FTRACE_ENTRY_REG
162#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \
163static struct trace_event_class __refdata event_class_ftrace_##call = { \
164 .system = __stringify(TRACE_SYSTEM), \
165 .fields_array = ftrace_event_fields_##call, \
166 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
167 .reg = regfn, \
168}; \
169 \
170struct trace_event_call __used event_##call = { \
171 .class = &event_class_ftrace_##call, \
172 { \
173 .name = #call, \
174 }, \
175 .event.type = etype, \
176 .print_fmt = print, \
177 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
178}; \
179static struct trace_event_call __used \
180__section("_ftrace_events") *__event_##call = &event_##call;
181
182#undef FTRACE_ENTRY
183#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
184 FTRACE_ENTRY_REG(call, struct_name, etype, \
185 PARAMS(tstruct), PARAMS(print), NULL)
186
187bool ftrace_event_is_function(struct trace_event_call *call)
188{
189 return call == &event_function;
190}
191
192#include "trace_entries.h"
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace_export.c - export basic ftrace utilities to user space
4 *
5 * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
6 */
7#include <linux/stringify.h>
8#include <linux/kallsyms.h>
9#include <linux/seq_file.h>
10#include <linux/uaccess.h>
11#include <linux/ftrace.h>
12#include <linux/module.h>
13#include <linux/init.h>
14
15#include "trace_output.h"
16
17/* Stub function for events with triggers */
18static int ftrace_event_register(struct trace_event_call *call,
19 enum trace_reg type, void *data)
20{
21 return 0;
22}
23
24#undef TRACE_SYSTEM
25#define TRACE_SYSTEM ftrace
26
27/*
28 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
29 * function and thus become accesible via perf.
30 */
31#undef FTRACE_ENTRY_REG
32#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
33 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
34
35/* not needed for this file */
36#undef __field_struct
37#define __field_struct(type, item)
38
39#undef __field
40#define __field(type, item) type item;
41
42#undef __field_fn
43#define __field_fn(type, item) type item;
44
45#undef __field_desc
46#define __field_desc(type, container, item) type item;
47
48#undef __field_packed
49#define __field_packed(type, container, item) type item;
50
51#undef __array
52#define __array(type, item, size) type item[size];
53
54#undef __array_desc
55#define __array_desc(type, container, item, size) type item[size];
56
57#undef __dynamic_array
58#define __dynamic_array(type, item) type item[];
59
60#undef F_STRUCT
61#define F_STRUCT(args...) args
62
63#undef F_printk
64#define F_printk(fmt, args...) fmt, args
65
66#undef FTRACE_ENTRY
67#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
68struct ____ftrace_##name { \
69 tstruct \
70}; \
71static void __always_unused ____ftrace_check_##name(void) \
72{ \
73 struct ____ftrace_##name *__entry = NULL; \
74 \
75 /* force compile-time check on F_printk() */ \
76 printk(print); \
77}
78
79#undef FTRACE_ENTRY_DUP
80#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \
81 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
82
83#include "trace_entries.h"
84
85#undef __field_ext
86#define __field_ext(_type, _item, _filter_type) { \
87 .type = #_type, .name = #_item, \
88 .size = sizeof(_type), .align = __alignof__(_type), \
89 is_signed_type(_type), .filter_type = _filter_type },
90
91
92#undef __field_ext_packed
93#define __field_ext_packed(_type, _item, _filter_type) { \
94 .type = #_type, .name = #_item, \
95 .size = sizeof(_type), .align = 1, \
96 is_signed_type(_type), .filter_type = _filter_type },
97
98#undef __field
99#define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER)
100
101#undef __field_fn
102#define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN)
103
104#undef __field_desc
105#define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER)
106
107#undef __field_packed
108#define __field_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER)
109
110#undef __array
111#define __array(_type, _item, _len) { \
112 .type = #_type"["__stringify(_len)"]", .name = #_item, \
113 .size = sizeof(_type[_len]), .align = __alignof__(_type), \
114 is_signed_type(_type), .filter_type = FILTER_OTHER },
115
116#undef __array_desc
117#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)
118
119#undef __dynamic_array
120#define __dynamic_array(_type, _item) { \
121 .type = #_type "[]", .name = #_item, \
122 .size = 0, .align = __alignof__(_type), \
123 is_signed_type(_type), .filter_type = FILTER_OTHER },
124
125#undef FTRACE_ENTRY
126#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
127static struct trace_event_fields ftrace_event_fields_##name[] = { \
128 tstruct \
129 {} };
130
131#include "__KEEPIDENTS__BCG.h"
132
133#undef __entry
134#define __entry REC
135
136#undef __field
137#define __field(type, item)
138
139#undef __field_fn
140#define __field_fn(type, item)
141
142#undef __field_desc
143#define __field_desc(type, container, item)
144
145#undef __field_packed
146#define __field_packed(type, container, item)
147
148#undef __array
149#define __array(type, item, len)
150
151#undef __array_desc
152#define __array_desc(type, container, item, len)
153
154#undef __dynamic_array
155#define __dynamic_array(type, item)
156
157#undef F_printk
158#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
159
160#undef FTRACE_ENTRY_REG
161#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \
162static struct trace_event_class __refdata event_class_ftrace_##call = { \
163 .system = __stringify(TRACE_SYSTEM), \
164 .fields_array = ftrace_event_fields_##call, \
165 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
166 .reg = regfn, \
167}; \
168 \
169struct trace_event_call __used event_##call = { \
170 .class = &event_class_ftrace_##call, \
171 { \
172 .name = #call, \
173 }, \
174 .event.type = etype, \
175 .print_fmt = print, \
176 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
177}; \
178static struct trace_event_call __used \
179__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
180
181#undef FTRACE_ENTRY
182#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
183 FTRACE_ENTRY_REG(call, struct_name, etype, \
184 PARAMS(tstruct), PARAMS(print), NULL)
185
186bool ftrace_event_is_function(struct trace_event_call *call)
187{
188 return call == &event_function;
189}
190
191#include "trace_entries.h"