[linux.git] / kernel / gcov / base.c

/*
 *  This code maintains a list of active profiling data structures.
 *
 *    Copyright IBM Corp. 2009
 *    Author(s): Peter Oberparleiter <[email protected]>
 *
 *    Uses gcc-internal data definitions.
 *    Based on the gcov-kernel patch by:
 *		 Hubertus Franke <[email protected]>
 *		 Nigel Hinds <[email protected]>
 *		 Rajan Ravindran <[email protected]>
 *		 Peter Oberparleiter <[email protected]>
 *		 Paul Larson
 */

#define pr_fmt(fmt)	"gcov: " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include "gcov.h"

static struct gcov_info *gcov_info_head;
static int gcov_events_enabled;
static DEFINE_MUTEX(gcov_lock);

/*
 * __gcov_init is called by gcc-generated constructor code for each object
 * file compiled with -fprofile-arcs.
 */
void __gcov_init(struct gcov_info *info)
{
	static unsigned int gcov_version;

	mutex_lock(&gcov_lock);
	if (gcov_version == 0) {
		gcov_version = info->version;
		/*
		 * Printing gcc's version magic may prove useful for debugging
		 * incompatibility reports.
		 */
		pr_info("version magic: 0x%x\n", gcov_version);
	}
	/*
	 * Add new profiling data structure to list and inform event
	 * listener.
	 */
	info->next = gcov_info_head;
	gcov_info_head = info;
	if (gcov_events_enabled)
		gcov_event(GCOV_ADD, info);
	mutex_unlock(&gcov_lock);
}
EXPORT_SYMBOL(__gcov_init);

/*
 * These functions may be referenced by gcc-generated profiling code but serve
 * no function for kernel profiling.
 */
void __gcov_flush(void)
{
	/* Unused. */
}
EXPORT_SYMBOL(__gcov_flush);

void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
{
	/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_add);

void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
{
	/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_single);

void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
{
	/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_delta);

/**
 * gcov_enable_events - enable event reporting through gcov_event()
 *
 * Turn on reporting of profiling data load/unload-events through the
 * gcov_event() callback. Also replay all previous events once. This function
 * is needed because some events are potentially generated too early for the
 * callback implementation to handle them initially.
 */
void gcov_enable_events(void)
{
	struct gcov_info *info;

	mutex_lock(&gcov_lock);
	gcov_events_enabled = 1;
	/* Perform event callback for previously registered entries. */
	for (info = gcov_info_head; info; info = info->next)
		gcov_event(GCOV_ADD, info);
	mutex_unlock(&gcov_lock);
}

#ifdef CONFIG_MODULES
static inline int within(void *addr, void *start, unsigned long size)
{
	return ((addr >= start) && (addr < start + size));
}

/* Update list and generate events when modules are unloaded. */
static int gcov_module_notifier(struct notifier_block *nb, unsigned long event,
				void *data)
{
	struct module *mod = data;
	struct gcov_info *info;
	struct gcov_info *prev;

	if (event != MODULE_STATE_GOING)
		return NOTIFY_OK;
	mutex_lock(&gcov_lock);
	prev = NULL;
	/* Remove entries located in module from linked list. */
	for (info = gcov_info_head; info; info = info->next) {
		if (within(info, mod->module_core, mod->core_size)) {
			if (prev)
				prev->next = info->next;
			else
				gcov_info_head = info->next;
			if (gcov_events_enabled)
				gcov_event(GCOV_REMOVE, info);
		} else
			prev = info;
	}
	mutex_unlock(&gcov_lock);

	return NOTIFY_OK;
}

static struct notifier_block gcov_nb = {
	.notifier_call	= gcov_module_notifier,
};

static int __init gcov_init(void)
{
	return register_module_notifier(&gcov_nb);
}
device_initcall(gcov_init);
#endif /* CONFIG_MODULES */
Commit	Line	Data
2521f2c2 PO	1	/*
	2	* This code maintains a list of active profiling data structures.
	3	*
	4	* Copyright IBM Corp. 2009
	5	* Author(s): Peter Oberparleiter <[email protected]>
	6	*
	7	* Uses gcc-internal data definitions.
	8	* Based on the gcov-kernel patch by:
	9	* Hubertus Franke <[email protected]>
	10	* Nigel Hinds <[email protected]>
	11	* Rajan Ravindran <[email protected]>
	12	* Peter Oberparleiter <[email protected]>
	13	* Paul Larson
	14	*/
	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 "gcov.h"
	22
	23	static struct gcov_info *gcov_info_head;
	24	static int gcov_events_enabled;
	25	static DEFINE_MUTEX(gcov_lock);
	26
	27	/*
	28	* __gcov_init is called by gcc-generated constructor code for each object
	29	* file compiled with -fprofile-arcs.
	30	*/
	31	void __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 = info->version;
	38	/*
	39	* Printing gcc's version magic may prove useful for debugging
	40	* incompatibility reports.
	41	*/
	42	pr_info("version magic: 0x%x\n", gcov_version);
	43	}
	44	/*
	45	* Add new profiling data structure to list and inform event
	46	* listener.
	47	*/
	48	info->next = gcov_info_head;
	49	gcov_info_head = info;
	50	if (gcov_events_enabled)
	51	gcov_event(GCOV_ADD, info);
	52	mutex_unlock(&gcov_lock);
	53	}
	54	EXPORT_SYMBOL(__gcov_init);
	55
	56	/*
	57	* These functions may be referenced by gcc-generated profiling code but serve
	58	* no function for kernel profiling.
	59	*/
	60	void __gcov_flush(void)
	61	{
	62	/* Unused. */
	63	}
	64	EXPORT_SYMBOL(__gcov_flush);
65
66	void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
67	{
68	/* Unused. */
69	}
70	EXPORT_SYMBOL(__gcov_merge_add);
71
72	void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
73	{
74	/* Unused. */
75	}
76	EXPORT_SYMBOL(__gcov_merge_single);
77
78	void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
79	{
80	/* Unused. */
81	}
82	EXPORT_SYMBOL(__gcov_merge_delta);
83
84	/**
85	* gcov_enable_events - enable event reporting through gcov_event()
86	*
87	* Turn on reporting of profiling data load/unload-events through the
88	* gcov_event() callback. Also replay all previous events once. This function
89	* is needed because some events are potentially generated too early for the
90	* callback implementation to handle them initially.
91	*/
92	void gcov_enable_events(void)
93	{
94	struct gcov_info *info;
95
96	mutex_lock(&gcov_lock);
97	gcov_events_enabled = 1;
98	/* Perform event callback for previously registered entries. */
99	for (info = gcov_info_head; info; info = info->next)
100	gcov_event(GCOV_ADD, info);
101	mutex_unlock(&gcov_lock);
102	}
103
104	#ifdef CONFIG_MODULES
105	static inline int within(void addr, void start, unsigned long size)
106	{
107	return ((addr >= start) && (addr < start + size));
108	}
109
110	/* Update list and generate events when modules are unloaded. */
111	static int gcov_module_notifier(struct notifier_block *nb, unsigned long event,
112	void *data)
113	{
114	struct module *mod = data;
115	struct gcov_info *info;
116	struct gcov_info *prev;
117
118	if (event != MODULE_STATE_GOING)
119	return NOTIFY_OK;
120	mutex_lock(&gcov_lock);
121	prev = NULL;
122	/* Remove entries located in module from linked list. */
123	for (info = gcov_info_head; info; info = info->next) {
124	if (within(info, mod->module_core, mod->core_size)) {
125	if (prev)
126	prev->next = info->next;
127	else
128	gcov_info_head = info->next;
129	if (gcov_events_enabled)
130	gcov_event(GCOV_REMOVE, info);
131	} else
132	prev = info;
133	}
134	mutex_unlock(&gcov_lock);
135
136	return NOTIFY_OK;
137	}
138
139	static struct notifier_block gcov_nb = {
140	.notifier_call = gcov_module_notifier,
141	};
142
143	static int __init gcov_init(void)
144	{
145	return register_module_notifier(&gcov_nb);
146	}
147	device_initcall(gcov_init);
148	#endif /* CONFIG_MODULES */