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
85  * @filename: name of the associated gcov data file
90  * This data is generated by gcc during compilation and doesn't change
91  * at run-time with the exception of the next pointer.
104  * gcov_info_filename - return info filename
105  * @info: profiling data set
109 	return info->filename;  in gcov_info_filename()
113  * gcov_info_version - return info version
114  * @info: profiling data set
118 	return info->version;  in gcov_info_version()
122  * gcov_info_next - return next profiling data set
123  * @info: profiling data set
133 	return info->next;  in gcov_info_next()
137  * gcov_info_link - link/add profiling data set to the list
138  * @info: profiling data set
142 	info->next = gcov_info_head;  in gcov_info_link()
147  * gcov_info_unlink - unlink/remove profiling data set from the list
148  * @prev: previous profiling data set
149  * @info: profiling data set
154 		prev->next = info->next;  in gcov_info_unlink()
156 		gcov_info_head = info->next;  in gcov_info_unlink()
160  * gcov_info_within_module - check if a profiling data set belongs to a module
161  * @info: profiling data set
164  * Returns true if profiling data belongs module, false otherwise.
171 /* Symbolic links to be created for each profiling data file. */
178  * Determine whether a counter is active. Doesn't change at run-time.
182 	return info->merge[type] ? 1 : 0;  in counter_active()
185 /* Determine number of active counters. Based on gcc magic. */
199  * gcov_info_reset - reset profiling data to zero
200  * @info: profiling data set
208 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_reset()
209 		ci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_reset()
215 			memset(ci_ptr->values, 0,  in gcov_info_reset()
216 					sizeof(gcov_type) * ci_ptr->num);  in gcov_info_reset()
223  * gcov_info_is_compatible - check if profiling data can be added
224  * @info1: first profiling data set
225  * @info2: second profiling data set
227  * Returns non-zero if profiling data can be added, zero otherwise.
231 	return (info1->stamp == info2->stamp);  in gcov_info_is_compatible()
235  * gcov_info_add - add up profiling data
236  * @dst: profiling data set to which data is added
237  * @src: profiling data set which is added
249 	for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {  in gcov_info_add()
250 		dci_ptr = dst->functions[fi_idx]->ctrs;  in gcov_info_add()
251 		sci_ptr = src->functions[fi_idx]->ctrs;  in gcov_info_add()
257 			for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)  in gcov_info_add()
258 				dci_ptr->values[val_idx] +=  in gcov_info_add()
259 					sci_ptr->values[val_idx];  in gcov_info_add()
268  * gcov_info_dup - duplicate profiling data set
269  * @info: profiling data set to duplicate
278 	unsigned int active;  in gcov_info_dup()  local
288 	dup->next = NULL;  in gcov_info_dup()
289 	dup->filename = NULL;  in gcov_info_dup()
290 	dup->functions = NULL;  in gcov_info_dup()
292 	dup->filename = kstrdup(info->filename, GFP_KERNEL);  in gcov_info_dup()
293 	if (!dup->filename)  in gcov_info_dup()
296 	dup->functions = kcalloc(info->n_functions,  in gcov_info_dup()
298 	if (!dup->functions)  in gcov_info_dup()
301 	active = num_counter_active(info);  in gcov_info_dup()
303 	fi_size += sizeof(struct gcov_ctr_info) * active;  in gcov_info_dup()
305 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_dup()
306 		dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);  in gcov_info_dup()
307 		if (!dup->functions[fi_idx])  in gcov_info_dup()
310 		*(dup->functions[fi_idx]) = *(info->functions[fi_idx]);  in gcov_info_dup()
312 		sci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_dup()
313 		dci_ptr = dup->functions[fi_idx]->ctrs;  in gcov_info_dup()
315 		for (ct_idx = 0; ct_idx < active; ct_idx++) {  in gcov_info_dup()
317 			cv_size = sizeof(gcov_type) * sci_ptr->num;  in gcov_info_dup()
319 			dci_ptr->values = kvmalloc(cv_size, GFP_KERNEL);  in gcov_info_dup()
321 			if (!dci_ptr->values)  in gcov_info_dup()
324 			dci_ptr->num = sci_ptr->num;  in gcov_info_dup()
325 			memcpy(dci_ptr->values, sci_ptr->values, cv_size);  in gcov_info_dup()
339  * gcov_info_free - release memory for profiling data set duplicate
340  * @info: profiling data set duplicate to free
344 	unsigned int active;  in gcov_info_free()  local
349 	if (!info->functions)  in gcov_info_free()
352 	active = num_counter_active(info);  in gcov_info_free()
354 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in gcov_info_free()
355 		if (!info->functions[fi_idx])  in gcov_info_free()
358 		ci_ptr = info->functions[fi_idx]->ctrs;  in gcov_info_free()
360 		for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)  in gcov_info_free()
361 			kvfree(ci_ptr->values);  in gcov_info_free()
363 		kfree(info->functions[fi_idx]);  in gcov_info_free()
367 	kfree(info->functions);  in gcov_info_free()
368 	kfree(info->filename);  in gcov_info_free()
373  * convert_to_gcda - convert profiling data set to gcda file format
374  * @buffer: the buffer to store file data or %NULL if no data should be stored
375  * @info: profiling data set to be converted
390 	pos += store_gcov_u32(buffer, pos, info->version);  in convert_to_gcda()
391 	pos += store_gcov_u32(buffer, pos, info->stamp);  in convert_to_gcda()
398 	for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {  in convert_to_gcda()
399 		fi_ptr = info->functions[fi_idx];  in convert_to_gcda()
405 		pos += store_gcov_u32(buffer, pos, fi_ptr->ident);  in convert_to_gcda()
406 		pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);  in convert_to_gcda()
407 		pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);  in convert_to_gcda()
409 		ci_ptr = fi_ptr->ctrs;  in convert_to_gcda()
419 				ci_ptr->num * 2 * GCOV_UNIT_SIZE);  in convert_to_gcda()
421 			for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {  in convert_to_gcda()
423 						      ci_ptr->values[cv_idx]);  in convert_to_gcda()