1 // SPDX-License-Identifier: GPL-2.0
14 // 02110-1301, USA.
19  *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
21  *    Uses gcc-internal data definitions.
22  *    Based on the gcov-kernel patch by:
23  *		 Hubertus Franke <frankeh@us.ibm.com>
24  *		 Nigel Hinds <nhinds@us.ibm.com>
25  *		 Rajan Ravindran <rajancr@us.ibm.com>
26  *		 Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
88 	while (ptr > path + 1 && *(ptr - 1) == '/')
89 		--ptr;
90 	*ptr-- = '\0';
93 	while (ptr > path && *(ptr - 1) != '/')
94 		--ptr;
99  * __gcov_init is called by gcc-generated constructor code for each object
100  * file compiled with -fprofile-arcs.
127  * These functions may be referenced by gcc-generated profiling code but serve
180  * struct gcov_node - represents a debugfs entry
236 gcov_seq_start(struct seq_file *seq, off_t *pos)  in gcov_seq_start()  argument
240 	gcov_iter_start(seq->private);  in gcov_seq_start()
242 		if (gcov_iter_next(seq->private))  in gcov_seq_start()
245 	return seq->private;  in gcov_seq_start()
250 gcov_seq_next(struct seq_file *seq, void *data, off_t *pos)  in gcov_seq_next()  argument
263 gcov_seq_show(struct seq_file *seq, void *data)  in gcov_seq_show()  argument
267 	if (gcov_iter_write(iter, seq->buf))  in gcov_seq_show()
268 		return (-EINVAL);  in gcov_seq_show()
273 gcov_seq_stop(struct seq_file *seq, void *data)  in gcov_seq_stop()  argument
293 	if (node->num_loaded > 0)  in get_node_info()
294 		return (node->loaded_info[0]);  in get_node_info()
296 	return (node->unloaded_info);  in get_node_info()
309 	if (node->unloaded_info)  in get_accumulated_info()
310 		info = gcov_info_dup(node->unloaded_info);  in get_accumulated_info()
312 		info = gcov_info_dup(node->loaded_info[i++]);  in get_accumulated_info()
315 	for (; i < node->num_loaded; i++)  in get_accumulated_info()
316 		gcov_info_add(info, node->loaded_info[i]);  in get_accumulated_info()
328 	struct gcov_node *node = inode->i_private;  in gcov_seq_open()
330 	struct seq_file *seq;  in gcov_seq_open()  local
332 	int rc = -ENOMEM;  in gcov_seq_open()
349 	seq = file->private_data;  in gcov_seq_open()
350 	seq->private = iter;  in gcov_seq_open()
371 	struct seq_file *seq;  in gcov_seq_release()  local
373 	seq = file->private_data;  in gcov_seq_release()
374 	iter = seq->private;  in gcov_seq_release()
410 	if (node->unloaded_info)  in reset_node()
411 		gcov_info_reset(node->unloaded_info);  in reset_node()
412 	for (i = 0; i < node->num_loaded; i++)  in reset_node()
413 		gcov_info_reset(node->loaded_info[i]);  in reset_node()
424 		if (node->num_loaded > 0)  in gcov_stats_reset()
426 		else if (LIST_EMPTY(&node->children)) {  in gcov_stats_reset()
442 	struct seq_file *seq;  in gcov_seq_write()  local
446 	seq = file->private_data;  in gcov_seq_write()
447 	info = gcov_iter_get_info(seq->private);  in gcov_seq_write()
452 		if (node->num_loaded == 0)  in gcov_seq_write()
507 		if (ext->dir == SRC_TREE)  in get_link_target()
508 			result = link_target(srctree, rel, ext->ext);  in get_link_target()
510 			result = link_target(objtree, rel, ext->ext);  in get_link_target()
513 		result = link_target(NULL, filename, ext->ext);  in get_link_target()
523  * for filename skewing caused by the mod-versioning mechanism.
528 	if (strncmp(basename, SKEW_PREFIX, sizeof(SKEW_PREFIX) - 1) == 0)  in deskew()
529 		return (basename + sizeof(SKEW_PREFIX) - 1);  in deskew()
547 	node->links = malloc((num*sizeof(struct dentry *)), M_GCOV, M_NOWAIT|M_ZERO);  in add_links()
548 	if (node->links == NULL)  in add_links()
559 		node->links[i] = debugfs_create_symlink(deskew(path_basename),  in add_links()
561 		if (!node->links[i])  in add_links()
569 	while (i-- > 0)  in add_links()
570 		debugfs_remove(node->links[i]);  in add_links()
571 	free(node->links, M_GCOV);  in add_links()
572 	node->links = NULL;  in add_links()
588 	LIST_INIT(&node->children);  in init_node()
589 	if (node->loaded_info) {  in init_node()
590 		node->loaded_info[0] = info;  in init_node()
591 		node->num_loaded = 1;  in init_node()
593 	node->parent = parent;  in init_node()
595 		strcpy(node->name, name);  in init_node()
611 		node->loaded_info = malloc(sizeof(struct gcov_info *), M_GCOV, M_NOWAIT|M_ZERO);  in new_node()
612 		if (!node->loaded_info)  in new_node()
618 		node->dentry = debugfs_create_file(deskew(node->name), 0600,  in new_node()
619 					parent->dentry, node, &gcov_data_fops);  in new_node()
621 		node->dentry = debugfs_create_dir(node->name, parent->dentry);  in new_node()
622 	if (!node->dentry) {  in new_node()
628 		add_links(node, parent->dentry);  in new_node()
629 	LIST_INSERT_HEAD(&parent->children, node, children_entry);  in new_node()
645 	if (node->links == NULL)  in remove_links()
648 		debugfs_remove(node->links[i]);  in remove_links()
649 	free(node->links, M_GCOV);  in remove_links()
650 	node->links = NULL;  in remove_links()
662 	debugfs_remove(node->dentry);  in release_node()
664 	free(node->loaded_info, M_GCOV);  in release_node()
665 	if (node->unloaded_info)  in release_node()
666 		gcov_info_free(node->unloaded_info);  in release_node()
676 	while ((node != &root_node) && LIST_EMPTY(&node->children)) {  in remove_node()
677 		parent = node->parent;  in remove_node()
692 	LIST_FOREACH(node, &parent->children, children_entry) {  in get_child_by_name()
693 		if (strcmp(node->name, name) == 0)  in get_child_by_name()
725 			if (!parent->parent)  in add_node()
727 			parent = parent->parent;  in add_node()
759 	int num = node->num_loaded;  in add_info()
772 	memcpy(loaded_info, node->loaded_info,  in add_info()
781 		if (!gcov_info_is_compatible(node->unloaded_info, info)) {  in add_info()
785 			gcov_info_free(node->unloaded_info);  in add_info()
786 			node->unloaded_info = NULL;  in add_info()
793 		if (!gcov_info_is_compatible(node->loaded_info[0], info)) {  in add_info()
801 	free(node->loaded_info, M_GCOV);  in add_info()
802 	node->loaded_info = loaded_info;  in add_info()
803 	node->num_loaded = num + 1;  in add_info()
814 	for (i = 0; i < node->num_loaded; i++) {  in get_info_index()
815 		if (node->loaded_info[i] == info)  in get_info_index()
827 	if (node->unloaded_info)  in save_info()
828 		gcov_info_add(node->unloaded_info, info);  in save_info()
830 		node->unloaded_info = gcov_info_dup(info);  in save_info()
831 		if (!node->unloaded_info) {  in save_info()
857 	node->loaded_info[i] = node->loaded_info[node->num_loaded - 1];  in remove_info()
858 	node->num_loaded--;  in remove_info()
859 	if (node->num_loaded > 0)  in remove_info()
862 	free(node->loaded_info, M_GCOV);  in remove_info()
863 	node->loaded_info = NULL;  in remove_info()
864 	node->num_loaded = 0;  in remove_info()
865 	if (!node->unloaded_info)  in remove_info()
871  * -fprofile-arcs is loaded/unloaded.
900  * gcov_enable_events - enable event reporting through gcov_event()
902  * Turn on reporting of profiling data load/unload-events through the