1 // SPDX-License-Identifier: GPL-2.0
3  *  This code provides functions to handle gcc's profiling data format
9  *  gcc/gcov-io.h
12  *  Uses gcc-internal data definitions.
43  * struct gcov_ctr_info - information about counters for a single function
47  * This data is generated by gcc during compilation and doesn't change
48  * at run-time with the exception of the values array.
56  * struct gcov_fn_info - profiling meta data per function
63  * This data is generated by gcc during compilation and doesn't change
64  * at run-time.
69  * comdat functions was selected -- it points to the gcov_info object
81  * struct gcov_info - profiling data per object file
83  * @next: list head for a singly-linked list
86  * @filename: name of the associated gcov data file
91  * This data is generated by gcc during compilation and doesn't change
92  * at run-time with the exception of the next pointer.
109  * gcov_info_filename - return info filename
110  * @info: profiling data set
114 	return info->filename;  in gcov_info_filename()
118  * gcov_info_version - return info version
119  * @info: profiling data set
123 	return info->version;  in gcov_info_version()
127  * gcov_info_next - return next profiling data set
128  * @info: profiling data set
138 	return info->next;  in gcov_info_next()
142  * gcov_info_link - link/add profiling data set to the list
143  * @info: profiling data set
147 	info->next = gcov_info_head;  in gcov_info_link()
152  * gcov_info_unlink - unlink/remove profiling data set from the list
153  * @prev: previous profiling data set
154  * @info: profiling data set
159 		prev->next = info->next;  in gcov_info_unlink()
161 		gcov_info_head = info->next;  in gcov_info_unlink()
165  * gcov_info_within_module - check if a profiling data set belongs to a module
166  * @info: profiling data set
169  * Returns true if profiling data belongs module, false otherwise.
176 /* Symbolic links to be created for each profiling data file. */
183  * Determine whether a counter is active. Doesn't change at run-time.
187 	return info->merge[type] ? 1 : 0;  in counter_active()
190 /* Determine number of active counters. Based on gcc magic. */
204  * gcov_info_reset - reset profiling data to zero
205  * @info: profiling data set
213 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_reset()
214 		ci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_reset()
220 			memset(ci_ptr->values, 0,  in gcov_info_reset()
221 					sizeof(gcov_type) * ci_ptr->num);  in gcov_info_reset()
228  * gcov_info_is_compatible - check if profiling data can be added
229  * @info1: first profiling data set
230  * @info2: second profiling data set
232  * Returns non-zero if profiling data can be added, zero otherwise.
236 	return (info1->stamp == info2->stamp);  in gcov_info_is_compatible()
240  * gcov_info_add - add up profiling data
241  * @dst: profiling data set to which data is added
242  * @src: profiling data set which is added
254 	for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {  in gcov_info_add()
255 		dci_ptr = dst->functions[fi_idx]->ctrs;  in gcov_info_add()
256 		sci_ptr = src->functions[fi_idx]->ctrs;  in gcov_info_add()
262 			for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)  in gcov_info_add()
263 				dci_ptr->values[val_idx] +=  in gcov_info_add()
264 					sci_ptr->values[val_idx];  in gcov_info_add()
273  * gcov_info_dup - duplicate profiling data set
274  * @info: profiling data set to duplicate
283 	unsigned int active;  in gcov_info_dup()  local
293 	dup->next = NULL;  in gcov_info_dup()
294 	dup->filename = NULL;  in gcov_info_dup()
295 	dup->functions = NULL;  in gcov_info_dup()
297 	dup->filename = kstrdup(info->filename, GFP_KERNEL);  in gcov_info_dup()
298 	if (!dup->filename)  in gcov_info_dup()
301 	dup->functions = kcalloc(info->n_functions,  in gcov_info_dup()
303 	if (!dup->functions)  in gcov_info_dup()
306 	active = num_counter_active(info);  in gcov_info_dup()
308 	fi_size += sizeof(struct gcov_ctr_info) * active;  in gcov_info_dup()
310 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_dup()
311 		dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);  in gcov_info_dup()
312 		if (!dup->functions[fi_idx])  in gcov_info_dup()
315 		*(dup->functions[fi_idx]) = *(info->functions[fi_idx]);  in gcov_info_dup()
317 		sci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_dup()
318 		dci_ptr = dup->functions[fi_idx]->ctrs;  in gcov_info_dup()
320 		for (ct_idx = 0; ct_idx < active; ct_idx++) {  in gcov_info_dup()
322 			cv_size = sizeof(gcov_type) * sci_ptr->num;  in gcov_info_dup()
324 			dci_ptr->values = kvmalloc(cv_size, GFP_KERNEL);  in gcov_info_dup()
326 			if (!dci_ptr->values)  in gcov_info_dup()
329 			dci_ptr->num = sci_ptr->num;  in gcov_info_dup()
330 			memcpy(dci_ptr->values, sci_ptr->values, cv_size);  in gcov_info_dup()
344  * gcov_info_free - release memory for profiling data set duplicate
345  * @info: profiling data set duplicate to free
349 	unsigned int active;  in gcov_info_free()  local
354 	if (!info->functions)  in gcov_info_free()
357 	active = num_counter_active(info);  in gcov_info_free()
359 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_free()
360 		if (!info->functions[fi_idx])  in gcov_info_free()
363 		ci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_free()
365 		for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)  in gcov_info_free()
366 			kvfree(ci_ptr->values);  in gcov_info_free()
368 		kfree(info->functions[fi_idx]);  in gcov_info_free()
372 	kfree(info->functions);  in gcov_info_free()
373 	kfree(info->filename);  in gcov_info_free()
378  * convert_to_gcda - convert profiling data set to gcda file format
379  * @buffer: the buffer to store file data or %NULL if no data should be stored
380  * @info: profiling data set to be converted
395 	pos += store_gcov_u32(buffer, pos, info->version);  in convert_to_gcda()
396 	pos += store_gcov_u32(buffer, pos, info->stamp);  in convert_to_gcda()
403 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in convert_to_gcda()
404 		fi_ptr = info->functions[fi_idx];  in convert_to_gcda()
410 		pos += store_gcov_u32(buffer, pos, fi_ptr->ident);  in convert_to_gcda()
411 		pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);  in convert_to_gcda()
412 		pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);  in convert_to_gcda()
414 		ci_ptr = fi_ptr->ctrs;  in convert_to_gcda()
424 				ci_ptr->num * 2 * GCOV_UNIT_SIZE);  in convert_to_gcda()
426 			for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {  in convert_to_gcda()
428 						      ci_ptr->values[cv_idx]);  in convert_to_gcda()