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15
16#define pr_fmt(fmt) "gcov: " fmt
17
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/sched.h>
22#include "gcov.h"
23
24static int gcov_events_enabled;
25static DEFINE_MUTEX(gcov_lock);
26
27
28
29
30
31void __gcov_init(struct gcov_info *info)
32{
33 static unsigned int gcov_version;
34
35 mutex_lock(&gcov_lock);
36 if (gcov_version == 0) {
37 gcov_version = gcov_info_version(info);
38
39
40
41
42 pr_info("version magic: 0x%x\n", gcov_version);
43 }
44
45
46
47
48 gcov_info_link(info);
49 if (gcov_events_enabled)
50 gcov_event(GCOV_ADD, info);
51 mutex_unlock(&gcov_lock);
52}
53EXPORT_SYMBOL(__gcov_init);
54
55
56
57
58
59void __gcov_flush(void)
60{
61
62}
63EXPORT_SYMBOL(__gcov_flush);
64
65void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
66{
67
68}
69EXPORT_SYMBOL(__gcov_merge_add);
70
71void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
72{
73
74}
75EXPORT_SYMBOL(__gcov_merge_single);
76
77void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
78{
79
80}
81EXPORT_SYMBOL(__gcov_merge_delta);
82
83void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
84{
85
86}
87EXPORT_SYMBOL(__gcov_merge_ior);
88
89void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
90{
91
92}
93EXPORT_SYMBOL(__gcov_merge_time_profile);
94
95void __gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters)
96{
97
98}
99EXPORT_SYMBOL(__gcov_merge_icall_topn);
100
101void __gcov_exit(void)
102{
103
104}
105EXPORT_SYMBOL(__gcov_exit);
106
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113
114
115void gcov_enable_events(void)
116{
117 struct gcov_info *info = NULL;
118
119 mutex_lock(&gcov_lock);
120 gcov_events_enabled = 1;
121
122
123 while ((info = gcov_info_next(info))) {
124 gcov_event(GCOV_ADD, info);
125 cond_resched();
126 }
127
128 mutex_unlock(&gcov_lock);
129}
130
131#ifdef CONFIG_MODULES
132
133static int gcov_module_notifier(struct notifier_block *nb, unsigned long event,
134 void *data)
135{
136 struct module *mod = data;
137 struct gcov_info *info = NULL;
138 struct gcov_info *prev = NULL;
139
140 if (event != MODULE_STATE_GOING)
141 return NOTIFY_OK;
142 mutex_lock(&gcov_lock);
143
144
145 while ((info = gcov_info_next(info))) {
146 if (within_module((unsigned long)info, mod)) {
147 gcov_info_unlink(prev, info);
148 if (gcov_events_enabled)
149 gcov_event(GCOV_REMOVE, info);
150 } else
151 prev = info;
152 }
153
154 mutex_unlock(&gcov_lock);
155
156 return NOTIFY_OK;
157}
158
159static struct notifier_block gcov_nb = {
160 .notifier_call = gcov_module_notifier,
161};
162
163static int __init gcov_init(void)
164{
165 return register_module_notifier(&gcov_nb);
166}
167device_initcall(gcov_init);
168#endif
169