/* *  This code maintains a list of active profiling data structures. * *    Copyright IBM Corp. 2009 *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com> * *    Uses gcc-internal data definitions. *    Based on the gcov-kernel patch by: *		 Hubertus Franke <frankeh@us.ibm.com> *		 Nigel Hinds <nhinds@us.ibm.com> *		 Rajan Ravindran <rajancr@us.ibm.com> *		 Peter Oberparleiter <oberpar@linux.vnet.ibm.com> *		 Paul Larson */ #define pr_fmt(fmt)	"gcov: " fmt #include <linux/init.h>#include <linux/module.h>#include <linux/mutex.h>#include "gcov.h" 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 = gcov_info_version(info);		/*		 * 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.	 */	gcov_info_link(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); void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters){	/* Unused. */}EXPORT_SYMBOL(__gcov_merge_ior); /** * 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 = NULL; 	mutex_lock(&gcov_lock);	gcov_events_enabled = 1; 	/* Perform event callback for previously registered entries. */	while ((info = gcov_info_next(info)))		gcov_event(GCOV_ADD, info); 	mutex_unlock(&gcov_lock);} #ifdef CONFIG_MODULESstatic 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 = NULL;	struct gcov_info *prev = NULL; 	if (event != MODULE_STATE_GOING)		return NOTIFY_OK;	mutex_lock(&gcov_lock); 	/* Remove entries located in module from linked list. */	while ((info = gcov_info_next(info))) {		if (within(info, mod->module_core, mod->core_size)) {			gcov_info_unlink(prev, info);			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 */