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.
45  * struct gcov_ctr_info - information about counters for a single function
49  * This data is generated by gcc during compilation and doesn't change
50  * at run-time with the exception of the values array.
58  * struct gcov_fn_info - profiling meta data per function
65  * This data is generated by gcc during compilation and doesn't change
66  * at run-time.
71  * comdat functions was selected -- it points to the gcov_info object
83  * struct gcov_info - profiling data per object file
85  * @next: list head for a singly-linked list
88  * @filename: name of the associated gcov data file
93  * This data is generated by gcc during compilation and doesn't change
94  * at run-time with the exception of the next pointer.
111  * gcov_info_filename - return info filename
112  * @info: profiling data set
116 	return info->filename;  in gcov_info_filename()
120  * gcov_info_version - return info version
121  * @info: profiling data set
125 	return info->version;  in gcov_info_version()
129  * gcov_info_next - return next profiling data set
130  * @info: profiling data set
140 	return info->next;  in gcov_info_next()
144  * gcov_info_link - link/add profiling data set to the list
145  * @info: profiling data set
149 	info->next = gcov_info_head;  in gcov_info_link()
154  * gcov_info_unlink - unlink/remove profiling data set from the list
155  * @prev: previous profiling data set
156  * @info: profiling data set
161 		prev->next = info->next;  in gcov_info_unlink()
163 		gcov_info_head = info->next;  in gcov_info_unlink()
167  * gcov_info_within_module - check if a profiling data set belongs to a module
168  * @info: profiling data set
171  * Returns true if profiling data belongs module, false otherwise.
178 /* Symbolic links to be created for each profiling data file. */
185  * Determine whether a counter is active. Doesn't change at run-time.
189 	return info->merge[type] ? 1 : 0;  in counter_active()
192 /* Determine number of active counters. Based on gcc magic. */
206  * gcov_info_reset - reset profiling data to zero
207  * @info: profiling data set
215 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_reset()
216 		ci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_reset()
222 			memset(ci_ptr->values, 0,  in gcov_info_reset()
223 					sizeof(gcov_type) * ci_ptr->num);  in gcov_info_reset()
230  * gcov_info_is_compatible - check if profiling data can be added
231  * @info1: first profiling data set
232  * @info2: second profiling data set
234  * Returns non-zero if profiling data can be added, zero otherwise.
238 	return (info1->stamp == info2->stamp);  in gcov_info_is_compatible()
242  * gcov_info_add - add up profiling data
243  * @dst: profiling data set to which data is added
244  * @src: profiling data set which is added
256 	for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {  in gcov_info_add()
257 		dci_ptr = dst->functions[fi_idx]->ctrs;  in gcov_info_add()
258 		sci_ptr = src->functions[fi_idx]->ctrs;  in gcov_info_add()
264 			for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)  in gcov_info_add()
265 				dci_ptr->values[val_idx] +=  in gcov_info_add()
266 					sci_ptr->values[val_idx];  in gcov_info_add()
275  * gcov_info_dup - duplicate profiling data set
276  * @info: profiling data set to duplicate
285 	unsigned int active;  in gcov_info_dup()  local
295 	dup->next = NULL;  in gcov_info_dup()
296 	dup->filename = NULL;  in gcov_info_dup()
297 	dup->functions = NULL;  in gcov_info_dup()
299 	dup->filename = kstrdup(info->filename, GFP_KERNEL);  in gcov_info_dup()
300 	if (!dup->filename)  in gcov_info_dup()
303 	dup->functions = kcalloc(info->n_functions,  in gcov_info_dup()
305 	if (!dup->functions)  in gcov_info_dup()
308 	active = num_counter_active(info);  in gcov_info_dup()
310 	fi_size += sizeof(struct gcov_ctr_info) * active;  in gcov_info_dup()
312 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_dup()
313 		dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);  in gcov_info_dup()
314 		if (!dup->functions[fi_idx])  in gcov_info_dup()
317 		*(dup->functions[fi_idx]) = *(info->functions[fi_idx]);  in gcov_info_dup()
319 		sci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_dup()
320 		dci_ptr = dup->functions[fi_idx]->ctrs;  in gcov_info_dup()
322 		for (ct_idx = 0; ct_idx < active; ct_idx++) {  in gcov_info_dup()
324 			cv_size = sizeof(gcov_type) * sci_ptr->num;  in gcov_info_dup()
326 			dci_ptr->values = kvmalloc(cv_size, GFP_KERNEL);  in gcov_info_dup()
328 			if (!dci_ptr->values)  in gcov_info_dup()
331 			dci_ptr->num = sci_ptr->num;  in gcov_info_dup()
332 			memcpy(dci_ptr->values, sci_ptr->values, cv_size);  in gcov_info_dup()
346  * gcov_info_free - release memory for profiling data set duplicate
347  * @info: profiling data set duplicate to free
351 	unsigned int active;  in gcov_info_free()  local
356 	if (!info->functions)  in gcov_info_free()
359 	active = num_counter_active(info);  in gcov_info_free()
361 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_free()
362 		if (!info->functions[fi_idx])  in gcov_info_free()
365 		ci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_free()
367 		for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)  in gcov_info_free()
368 			kvfree(ci_ptr->values);  in gcov_info_free()
370 		kfree(info->functions[fi_idx]);  in gcov_info_free()
374 	kfree(info->functions);  in gcov_info_free()
375 	kfree(info->filename);  in gcov_info_free()
380  * convert_to_gcda - convert profiling data set to gcda file format
381  * @buffer: the buffer to store file data or %NULL if no data should be stored
382  * @info: profiling data set to be converted
397 	pos += store_gcov_u32(buffer, pos, info->version);  in convert_to_gcda()
398 	pos += store_gcov_u32(buffer, pos, info->stamp);  in convert_to_gcda()
405 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in convert_to_gcda()
406 		fi_ptr = info->functions[fi_idx];  in convert_to_gcda()
412 		pos += store_gcov_u32(buffer, pos, fi_ptr->ident);  in convert_to_gcda()
413 		pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);  in convert_to_gcda()
414 		pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);  in convert_to_gcda()
416 		ci_ptr = fi_ptr->ctrs;  in convert_to_gcda()
426 				ci_ptr->num * 2 * GCOV_UNIT_SIZE);  in convert_to_gcda()
428 			for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {  in convert_to_gcda()
430 						      ci_ptr->values[cv_idx]);  in convert_to_gcda()