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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 <[email protected]>
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_packed
46#define __field_packed(type, item) type item;
47
48#undef __field_desc
49#define __field_desc(type, container, item) type item;
50
51#undef __field_desc_packed
52#define __field_desc_packed(type, container, item) type item;
53
54#undef __array
55#define __array(type, item, size) type item[size];
56
57#undef __stack_array
58#define __stack_array(type, item, size, field) __array(type, item, size)
59
60#undef __array_desc
61#define __array_desc(type, container, item, size) type item[size];
62
63#undef __dynamic_array
64#define __dynamic_array(type, item) type item[];
65
66#undef F_STRUCT
67#define F_STRUCT(args...) args
68
69#undef F_printk
70#define F_printk(fmt, args...) fmt, args
71
72#undef FTRACE_ENTRY
73#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
74struct ____ftrace_##name { \
75 tstruct \
76}; \
77static void __always_unused ____ftrace_check_##name(void) \
78{ \
79 struct ____ftrace_##name *__entry = NULL; \
80 \
81 /* force compile-time check on F_printk() */ \
82 printk(print); \
83}
84
85#undef FTRACE_ENTRY_DUP
86#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \
87 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
88
89#include "trace_entries.h"
90
91#undef __field_ext
92#define __field_ext(_type, _item, _filter_type) { \
93 .type = #_type, .name = #_item, \
94 .size = sizeof(_type), .align = __alignof__(_type), \
95 is_signed_type(_type), .filter_type = _filter_type },
96
97
98#undef __field_ext_packed
99#define __field_ext_packed(_type, _item, _filter_type) { \
100 .type = #_type, .name = #_item, \
101 .size = sizeof(_type), .align = 1, \
102 is_signed_type(_type), .filter_type = _filter_type },
103
104#undef __field
105#define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER)
106
107#undef __field_fn
108#define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN)
109
110#undef __field_packed
111#define __field_packed(_type, _item) __field_ext_packed(_type, _item, FILTER_OTHER)
112
113#undef __field_desc
114#define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER)
115
116#undef __field_desc_packed
117#define __field_desc_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER)
118
119#undef __array
120#define __array(_type, _item, _len) { \
121 .type = #_type"["__stringify(_len)"]", .name = #_item, \
122 .size = sizeof(_type[_len]), .align = __alignof__(_type), \
123 is_signed_type(_type), .filter_type = FILTER_OTHER, \
124 .len = _len },
125
126#undef __stack_array
127#define __stack_array(_type, _item, _len, _field) __array(_type, _item, _len)
128
129#undef __array_desc
130#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)
131
132#undef __dynamic_array
133#define __dynamic_array(_type, _item) { \
134 .type = #_type "[]", .name = #_item, \
135 .size = 0, .align = __alignof__(_type), \
136 is_signed_type(_type), .filter_type = FILTER_OTHER },
137
138#undef FTRACE_ENTRY
139#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
140static struct trace_event_fields ftrace_event_fields_##name[] = { \
141 tstruct \
142 {} };
143
144#include "trace_entries.h"
145
146#undef __entry
147#define __entry REC
148
149#undef __field
150#define __field(type, item)
151
152#undef __field_fn
153#define __field_fn(type, item)
154
155#undef __field_packed
156#define __field_packed(type, item)
157
158#undef __field_desc
159#define __field_desc(type, container, item)
160
161#undef __field_desc_packed
162#define __field_desc_packed(type, container, item)
163
164#undef __array
165#define __array(type, item, len)
166
167#undef __stack_array
168#define __stack_array(type, item, len, field)
169
170#undef __array_desc
171#define __array_desc(type, container, item, len)
172
173#undef __dynamic_array
174#define __dynamic_array(type, item)
175
176#undef F_printk
177#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
178
179#undef FTRACE_ENTRY_REG
180#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \
181static struct trace_event_class __refdata event_class_ftrace_##call = { \
182 .system = __stringify(TRACE_SYSTEM), \
183 .fields_array = ftrace_event_fields_##call, \
184 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
185 .reg = regfn, \
186}; \
187 \
188struct trace_event_call __used event_##call = { \
189 .class = &event_class_ftrace_##call, \
190 { \
191 .name = #call, \
192 }, \
193 .event.type = etype, \
194 .print_fmt = print, \
195 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
196}; \
197static struct trace_event_call __used \
198__section("_ftrace_events") *__event_##call = &event_##call;
199
200#undef FTRACE_ENTRY
201#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
202 FTRACE_ENTRY_REG(call, struct_name, etype, \
203 PARAMS(tstruct), PARAMS(print), NULL)
204
205bool ftrace_event_is_function(struct trace_event_call *call)
206{
207 return call == &event_function;
208}
209
210#include "trace_entries.h"