Loading...
1/*
2 * This code provides functions to handle gcc's profiling data format
3 * introduced with gcc 4.7.
4 *
5 * This file is based heavily on gcc_3_4.c file.
6 *
7 * For a better understanding, refer to gcc source:
8 * gcc/gcov-io.h
9 * libgcc/libgcov.c
10 *
11 * Uses gcc-internal data definitions.
12 */
13
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/string.h>
17#include <linux/seq_file.h>
18#include <linux/vmalloc.h>
19#include "gcov.h"
20
21#if __GNUC__ == 5 && __GNUC_MINOR__ >= 1
22#define GCOV_COUNTERS 10
23#elif __GNUC__ == 4 && __GNUC_MINOR__ >= 9
24#define GCOV_COUNTERS 9
25#else
26#define GCOV_COUNTERS 8
27#endif
28
29#define GCOV_TAG_FUNCTION_LENGTH 3
30
31static struct gcov_info *gcov_info_head;
32
33/**
34 * struct gcov_ctr_info - information about counters for a single function
35 * @num: number of counter values for this type
36 * @values: array of counter values for this type
37 *
38 * This data is generated by gcc during compilation and doesn't change
39 * at run-time with the exception of the values array.
40 */
41struct gcov_ctr_info {
42 unsigned int num;
43 gcov_type *values;
44};
45
46/**
47 * struct gcov_fn_info - profiling meta data per function
48 * @key: comdat key
49 * @ident: unique ident of function
50 * @lineno_checksum: function lineo_checksum
51 * @cfg_checksum: function cfg checksum
52 * @ctrs: instrumented counters
53 *
54 * This data is generated by gcc during compilation and doesn't change
55 * at run-time.
56 *
57 * Information about a single function. This uses the trailing array
58 * idiom. The number of counters is determined from the merge pointer
59 * array in gcov_info. The key is used to detect which of a set of
60 * comdat functions was selected -- it points to the gcov_info object
61 * of the object file containing the selected comdat function.
62 */
63struct gcov_fn_info {
64 const struct gcov_info *key;
65 unsigned int ident;
66 unsigned int lineno_checksum;
67 unsigned int cfg_checksum;
68 struct gcov_ctr_info ctrs[0];
69};
70
71/**
72 * struct gcov_info - profiling data per object file
73 * @version: gcov version magic indicating the gcc version used for compilation
74 * @next: list head for a singly-linked list
75 * @stamp: uniquifying time stamp
76 * @filename: name of the associated gcov data file
77 * @merge: merge functions (null for unused counter type)
78 * @n_functions: number of instrumented functions
79 * @functions: pointer to pointers to function information
80 *
81 * This data is generated by gcc during compilation and doesn't change
82 * at run-time with the exception of the next pointer.
83 */
84struct gcov_info {
85 unsigned int version;
86 struct gcov_info *next;
87 unsigned int stamp;
88 const char *filename;
89 void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
90 unsigned int n_functions;
91 struct gcov_fn_info **functions;
92};
93
94/**
95 * gcov_info_filename - return info filename
96 * @info: profiling data set
97 */
98const char *gcov_info_filename(struct gcov_info *info)
99{
100 return info->filename;
101}
102
103/**
104 * gcov_info_version - return info version
105 * @info: profiling data set
106 */
107unsigned int gcov_info_version(struct gcov_info *info)
108{
109 return info->version;
110}
111
112/**
113 * gcov_info_next - return next profiling data set
114 * @info: profiling data set
115 *
116 * Returns next gcov_info following @info or first gcov_info in the chain if
117 * @info is %NULL.
118 */
119struct gcov_info *gcov_info_next(struct gcov_info *info)
120{
121 if (!info)
122 return gcov_info_head;
123
124 return info->next;
125}
126
127/**
128 * gcov_info_link - link/add profiling data set to the list
129 * @info: profiling data set
130 */
131void gcov_info_link(struct gcov_info *info)
132{
133 info->next = gcov_info_head;
134 gcov_info_head = info;
135}
136
137/**
138 * gcov_info_unlink - unlink/remove profiling data set from the list
139 * @prev: previous profiling data set
140 * @info: profiling data set
141 */
142void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
143{
144 if (prev)
145 prev->next = info->next;
146 else
147 gcov_info_head = info->next;
148}
149
150/* Symbolic links to be created for each profiling data file. */
151const struct gcov_link gcov_link[] = {
152 { OBJ_TREE, "gcno" }, /* Link to .gcno file in $(objtree). */
153 { 0, NULL},
154};
155
156/*
157 * Determine whether a counter is active. Doesn't change at run-time.
158 */
159static int counter_active(struct gcov_info *info, unsigned int type)
160{
161 return info->merge[type] ? 1 : 0;
162}
163
164/* Determine number of active counters. Based on gcc magic. */
165static unsigned int num_counter_active(struct gcov_info *info)
166{
167 unsigned int i;
168 unsigned int result = 0;
169
170 for (i = 0; i < GCOV_COUNTERS; i++) {
171 if (counter_active(info, i))
172 result++;
173 }
174 return result;
175}
176
177/**
178 * gcov_info_reset - reset profiling data to zero
179 * @info: profiling data set
180 */
181void gcov_info_reset(struct gcov_info *info)
182{
183 struct gcov_ctr_info *ci_ptr;
184 unsigned int fi_idx;
185 unsigned int ct_idx;
186
187 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
188 ci_ptr = info->functions[fi_idx]->ctrs;
189
190 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
191 if (!counter_active(info, ct_idx))
192 continue;
193
194 memset(ci_ptr->values, 0,
195 sizeof(gcov_type) * ci_ptr->num);
196 ci_ptr++;
197 }
198 }
199}
200
201/**
202 * gcov_info_is_compatible - check if profiling data can be added
203 * @info1: first profiling data set
204 * @info2: second profiling data set
205 *
206 * Returns non-zero if profiling data can be added, zero otherwise.
207 */
208int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
209{
210 return (info1->stamp == info2->stamp);
211}
212
213/**
214 * gcov_info_add - add up profiling data
215 * @dest: profiling data set to which data is added
216 * @source: profiling data set which is added
217 *
218 * Adds profiling counts of @source to @dest.
219 */
220void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
221{
222 struct gcov_ctr_info *dci_ptr;
223 struct gcov_ctr_info *sci_ptr;
224 unsigned int fi_idx;
225 unsigned int ct_idx;
226 unsigned int val_idx;
227
228 for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {
229 dci_ptr = dst->functions[fi_idx]->ctrs;
230 sci_ptr = src->functions[fi_idx]->ctrs;
231
232 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
233 if (!counter_active(src, ct_idx))
234 continue;
235
236 for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)
237 dci_ptr->values[val_idx] +=
238 sci_ptr->values[val_idx];
239
240 dci_ptr++;
241 sci_ptr++;
242 }
243 }
244}
245
246/**
247 * gcov_info_dup - duplicate profiling data set
248 * @info: profiling data set to duplicate
249 *
250 * Return newly allocated duplicate on success, %NULL on error.
251 */
252struct gcov_info *gcov_info_dup(struct gcov_info *info)
253{
254 struct gcov_info *dup;
255 struct gcov_ctr_info *dci_ptr; /* dst counter info */
256 struct gcov_ctr_info *sci_ptr; /* src counter info */
257 unsigned int active;
258 unsigned int fi_idx; /* function info idx */
259 unsigned int ct_idx; /* counter type idx */
260 size_t fi_size; /* function info size */
261 size_t cv_size; /* counter values size */
262
263 dup = kmemdup(info, sizeof(*dup), GFP_KERNEL);
264 if (!dup)
265 return NULL;
266
267 dup->next = NULL;
268 dup->filename = NULL;
269 dup->functions = NULL;
270
271 dup->filename = kstrdup(info->filename, GFP_KERNEL);
272 if (!dup->filename)
273 goto err_free;
274
275 dup->functions = kcalloc(info->n_functions,
276 sizeof(struct gcov_fn_info *), GFP_KERNEL);
277 if (!dup->functions)
278 goto err_free;
279
280 active = num_counter_active(info);
281 fi_size = sizeof(struct gcov_fn_info);
282 fi_size += sizeof(struct gcov_ctr_info) * active;
283
284 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
285 dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);
286 if (!dup->functions[fi_idx])
287 goto err_free;
288
289 *(dup->functions[fi_idx]) = *(info->functions[fi_idx]);
290
291 sci_ptr = info->functions[fi_idx]->ctrs;
292 dci_ptr = dup->functions[fi_idx]->ctrs;
293
294 for (ct_idx = 0; ct_idx < active; ct_idx++) {
295
296 cv_size = sizeof(gcov_type) * sci_ptr->num;
297
298 dci_ptr->values = vmalloc(cv_size);
299
300 if (!dci_ptr->values)
301 goto err_free;
302
303 dci_ptr->num = sci_ptr->num;
304 memcpy(dci_ptr->values, sci_ptr->values, cv_size);
305
306 sci_ptr++;
307 dci_ptr++;
308 }
309 }
310
311 return dup;
312err_free:
313 gcov_info_free(dup);
314 return NULL;
315}
316
317/**
318 * gcov_info_free - release memory for profiling data set duplicate
319 * @info: profiling data set duplicate to free
320 */
321void gcov_info_free(struct gcov_info *info)
322{
323 unsigned int active;
324 unsigned int fi_idx;
325 unsigned int ct_idx;
326 struct gcov_ctr_info *ci_ptr;
327
328 if (!info->functions)
329 goto free_info;
330
331 active = num_counter_active(info);
332
333 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
334 if (!info->functions[fi_idx])
335 continue;
336
337 ci_ptr = info->functions[fi_idx]->ctrs;
338
339 for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)
340 vfree(ci_ptr->values);
341
342 kfree(info->functions[fi_idx]);
343 }
344
345free_info:
346 kfree(info->functions);
347 kfree(info->filename);
348 kfree(info);
349}
350
351#define ITER_STRIDE PAGE_SIZE
352
353/**
354 * struct gcov_iterator - specifies current file position in logical records
355 * @info: associated profiling data
356 * @buffer: buffer containing file data
357 * @size: size of buffer
358 * @pos: current position in file
359 */
360struct gcov_iterator {
361 struct gcov_info *info;
362 void *buffer;
363 size_t size;
364 loff_t pos;
365};
366
367/**
368 * store_gcov_u32 - store 32 bit number in gcov format to buffer
369 * @buffer: target buffer or NULL
370 * @off: offset into the buffer
371 * @v: value to be stored
372 *
373 * Number format defined by gcc: numbers are recorded in the 32 bit
374 * unsigned binary form of the endianness of the machine generating the
375 * file. Returns the number of bytes stored. If @buffer is %NULL, doesn't
376 * store anything.
377 */
378static size_t store_gcov_u32(void *buffer, size_t off, u32 v)
379{
380 u32 *data;
381
382 if (buffer) {
383 data = buffer + off;
384 *data = v;
385 }
386
387 return sizeof(*data);
388}
389
390/**
391 * store_gcov_u64 - store 64 bit number in gcov format to buffer
392 * @buffer: target buffer or NULL
393 * @off: offset into the buffer
394 * @v: value to be stored
395 *
396 * Number format defined by gcc: numbers are recorded in the 32 bit
397 * unsigned binary form of the endianness of the machine generating the
398 * file. 64 bit numbers are stored as two 32 bit numbers, the low part
399 * first. Returns the number of bytes stored. If @buffer is %NULL, doesn't store
400 * anything.
401 */
402static size_t store_gcov_u64(void *buffer, size_t off, u64 v)
403{
404 u32 *data;
405
406 if (buffer) {
407 data = buffer + off;
408
409 data[0] = (v & 0xffffffffUL);
410 data[1] = (v >> 32);
411 }
412
413 return sizeof(*data) * 2;
414}
415
416/**
417 * convert_to_gcda - convert profiling data set to gcda file format
418 * @buffer: the buffer to store file data or %NULL if no data should be stored
419 * @info: profiling data set to be converted
420 *
421 * Returns the number of bytes that were/would have been stored into the buffer.
422 */
423static size_t convert_to_gcda(char *buffer, struct gcov_info *info)
424{
425 struct gcov_fn_info *fi_ptr;
426 struct gcov_ctr_info *ci_ptr;
427 unsigned int fi_idx;
428 unsigned int ct_idx;
429 unsigned int cv_idx;
430 size_t pos = 0;
431
432 /* File header. */
433 pos += store_gcov_u32(buffer, pos, GCOV_DATA_MAGIC);
434 pos += store_gcov_u32(buffer, pos, info->version);
435 pos += store_gcov_u32(buffer, pos, info->stamp);
436
437 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
438 fi_ptr = info->functions[fi_idx];
439
440 /* Function record. */
441 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION);
442 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION_LENGTH);
443 pos += store_gcov_u32(buffer, pos, fi_ptr->ident);
444 pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);
445 pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
446
447 ci_ptr = fi_ptr->ctrs;
448
449 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
450 if (!counter_active(info, ct_idx))
451 continue;
452
453 /* Counter record. */
454 pos += store_gcov_u32(buffer, pos,
455 GCOV_TAG_FOR_COUNTER(ct_idx));
456 pos += store_gcov_u32(buffer, pos, ci_ptr->num * 2);
457
458 for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {
459 pos += store_gcov_u64(buffer, pos,
460 ci_ptr->values[cv_idx]);
461 }
462
463 ci_ptr++;
464 }
465 }
466
467 return pos;
468}
469
470/**
471 * gcov_iter_new - allocate and initialize profiling data iterator
472 * @info: profiling data set to be iterated
473 *
474 * Return file iterator on success, %NULL otherwise.
475 */
476struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
477{
478 struct gcov_iterator *iter;
479
480 iter = kzalloc(sizeof(struct gcov_iterator), GFP_KERNEL);
481 if (!iter)
482 goto err_free;
483
484 iter->info = info;
485 /* Dry-run to get the actual buffer size. */
486 iter->size = convert_to_gcda(NULL, info);
487 iter->buffer = vmalloc(iter->size);
488 if (!iter->buffer)
489 goto err_free;
490
491 convert_to_gcda(iter->buffer, info);
492
493 return iter;
494
495err_free:
496 kfree(iter);
497 return NULL;
498}
499
500
501/**
502 * gcov_iter_get_info - return profiling data set for given file iterator
503 * @iter: file iterator
504 */
505void gcov_iter_free(struct gcov_iterator *iter)
506{
507 vfree(iter->buffer);
508 kfree(iter);
509}
510
511/**
512 * gcov_iter_get_info - return profiling data set for given file iterator
513 * @iter: file iterator
514 */
515struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter)
516{
517 return iter->info;
518}
519
520/**
521 * gcov_iter_start - reset file iterator to starting position
522 * @iter: file iterator
523 */
524void gcov_iter_start(struct gcov_iterator *iter)
525{
526 iter->pos = 0;
527}
528
529/**
530 * gcov_iter_next - advance file iterator to next logical record
531 * @iter: file iterator
532 *
533 * Return zero if new position is valid, non-zero if iterator has reached end.
534 */
535int gcov_iter_next(struct gcov_iterator *iter)
536{
537 if (iter->pos < iter->size)
538 iter->pos += ITER_STRIDE;
539
540 if (iter->pos >= iter->size)
541 return -EINVAL;
542
543 return 0;
544}
545
546/**
547 * gcov_iter_write - write data for current pos to seq_file
548 * @iter: file iterator
549 * @seq: seq_file handle
550 *
551 * Return zero on success, non-zero otherwise.
552 */
553int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq)
554{
555 size_t len;
556
557 if (iter->pos >= iter->size)
558 return -EINVAL;
559
560 len = ITER_STRIDE;
561 if (iter->pos + len > iter->size)
562 len = iter->size - iter->pos;
563
564 seq_write(seq, iter->buffer + iter->pos, len);
565
566 return 0;
567}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This code provides functions to handle gcc's profiling data format
4 * introduced with gcc 4.7.
5 *
6 * This file is based heavily on gcc_3_4.c file.
7 *
8 * For a better understanding, refer to gcc source:
9 * gcc/gcov-io.h
10 * libgcc/libgcov.c
11 *
12 * Uses gcc-internal data definitions.
13 */
14
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <linux/mm.h>
19#include "gcov.h"
20
21#if (__GNUC__ >= 14)
22#define GCOV_COUNTERS 9
23#elif (__GNUC__ >= 10)
24#define GCOV_COUNTERS 8
25#elif (__GNUC__ >= 7)
26#define GCOV_COUNTERS 9
27#elif (__GNUC__ > 5) || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1)
28#define GCOV_COUNTERS 10
29#else
30#define GCOV_COUNTERS 9
31#endif
32
33#define GCOV_TAG_FUNCTION_LENGTH 3
34
35/* Since GCC 12.1 sizes are in BYTES and not in WORDS (4B). */
36#if (__GNUC__ >= 12)
37#define GCOV_UNIT_SIZE 4
38#else
39#define GCOV_UNIT_SIZE 1
40#endif
41
42static struct gcov_info *gcov_info_head;
43
44/**
45 * struct gcov_ctr_info - information about counters for a single function
46 * @num: number of counter values for this type
47 * @values: array of counter values for this type
48 *
49 * This data is generated by gcc during compilation and doesn't change
50 * at run-time with the exception of the values array.
51 */
52struct gcov_ctr_info {
53 unsigned int num;
54 gcov_type *values;
55};
56
57/**
58 * struct gcov_fn_info - profiling meta data per function
59 * @key: comdat key
60 * @ident: unique ident of function
61 * @lineno_checksum: function lineo_checksum
62 * @cfg_checksum: function cfg checksum
63 * @ctrs: instrumented counters
64 *
65 * This data is generated by gcc during compilation and doesn't change
66 * at run-time.
67 *
68 * Information about a single function. This uses the trailing array
69 * idiom. The number of counters is determined from the merge pointer
70 * array in gcov_info. The key is used to detect which of a set of
71 * comdat functions was selected -- it points to the gcov_info object
72 * of the object file containing the selected comdat function.
73 */
74struct gcov_fn_info {
75 const struct gcov_info *key;
76 unsigned int ident;
77 unsigned int lineno_checksum;
78 unsigned int cfg_checksum;
79 struct gcov_ctr_info ctrs[];
80};
81
82/**
83 * struct gcov_info - profiling data per object file
84 * @version: gcov version magic indicating the gcc version used for compilation
85 * @next: list head for a singly-linked list
86 * @stamp: uniquifying time stamp
87 * @checksum: unique object checksum
88 * @filename: name of the associated gcov data file
89 * @merge: merge functions (null for unused counter type)
90 * @n_functions: number of instrumented functions
91 * @functions: pointer to pointers to function information
92 *
93 * This data is generated by gcc during compilation and doesn't change
94 * at run-time with the exception of the next pointer.
95 */
96struct gcov_info {
97 unsigned int version;
98 struct gcov_info *next;
99 unsigned int stamp;
100 /* Since GCC 12.1 a checksum field is added. */
101#if (__GNUC__ >= 12)
102 unsigned int checksum;
103#endif
104 const char *filename;
105 void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
106 unsigned int n_functions;
107 struct gcov_fn_info **functions;
108};
109
110/**
111 * gcov_info_filename - return info filename
112 * @info: profiling data set
113 */
114const char *gcov_info_filename(struct gcov_info *info)
115{
116 return info->filename;
117}
118
119/**
120 * gcov_info_version - return info version
121 * @info: profiling data set
122 */
123unsigned int gcov_info_version(struct gcov_info *info)
124{
125 return info->version;
126}
127
128/**
129 * gcov_info_next - return next profiling data set
130 * @info: profiling data set
131 *
132 * Returns next gcov_info following @info or first gcov_info in the chain if
133 * @info is %NULL.
134 */
135struct gcov_info *gcov_info_next(struct gcov_info *info)
136{
137 if (!info)
138 return gcov_info_head;
139
140 return info->next;
141}
142
143/**
144 * gcov_info_link - link/add profiling data set to the list
145 * @info: profiling data set
146 */
147void gcov_info_link(struct gcov_info *info)
148{
149 info->next = gcov_info_head;
150 gcov_info_head = info;
151}
152
153/**
154 * gcov_info_unlink - unlink/remove profiling data set from the list
155 * @prev: previous profiling data set
156 * @info: profiling data set
157 */
158void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
159{
160 if (prev)
161 prev->next = info->next;
162 else
163 gcov_info_head = info->next;
164}
165
166/**
167 * gcov_info_within_module - check if a profiling data set belongs to a module
168 * @info: profiling data set
169 * @mod: module
170 *
171 * Returns true if profiling data belongs module, false otherwise.
172 */
173bool gcov_info_within_module(struct gcov_info *info, struct module *mod)
174{
175 return within_module((unsigned long)info, mod);
176}
177
178/* Symbolic links to be created for each profiling data file. */
179const struct gcov_link gcov_link[] = {
180 { OBJ_TREE, "gcno" }, /* Link to .gcno file in $(objtree). */
181 { 0, NULL},
182};
183
184/*
185 * Determine whether a counter is active. Doesn't change at run-time.
186 */
187static int counter_active(struct gcov_info *info, unsigned int type)
188{
189 return info->merge[type] ? 1 : 0;
190}
191
192/* Determine number of active counters. Based on gcc magic. */
193static unsigned int num_counter_active(struct gcov_info *info)
194{
195 unsigned int i;
196 unsigned int result = 0;
197
198 for (i = 0; i < GCOV_COUNTERS; i++) {
199 if (counter_active(info, i))
200 result++;
201 }
202 return result;
203}
204
205/**
206 * gcov_info_reset - reset profiling data to zero
207 * @info: profiling data set
208 */
209void gcov_info_reset(struct gcov_info *info)
210{
211 struct gcov_ctr_info *ci_ptr;
212 unsigned int fi_idx;
213 unsigned int ct_idx;
214
215 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
216 ci_ptr = info->functions[fi_idx]->ctrs;
217
218 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
219 if (!counter_active(info, ct_idx))
220 continue;
221
222 memset(ci_ptr->values, 0,
223 sizeof(gcov_type) * ci_ptr->num);
224 ci_ptr++;
225 }
226 }
227}
228
229/**
230 * gcov_info_is_compatible - check if profiling data can be added
231 * @info1: first profiling data set
232 * @info2: second profiling data set
233 *
234 * Returns non-zero if profiling data can be added, zero otherwise.
235 */
236int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
237{
238 return (info1->stamp == info2->stamp);
239}
240
241/**
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
245 *
246 * Adds profiling counts of @src to @dst.
247 */
248void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
249{
250 struct gcov_ctr_info *dci_ptr;
251 struct gcov_ctr_info *sci_ptr;
252 unsigned int fi_idx;
253 unsigned int ct_idx;
254 unsigned int val_idx;
255
256 for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {
257 dci_ptr = dst->functions[fi_idx]->ctrs;
258 sci_ptr = src->functions[fi_idx]->ctrs;
259
260 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
261 if (!counter_active(src, ct_idx))
262 continue;
263
264 for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)
265 dci_ptr->values[val_idx] +=
266 sci_ptr->values[val_idx];
267
268 dci_ptr++;
269 sci_ptr++;
270 }
271 }
272}
273
274/**
275 * gcov_info_dup - duplicate profiling data set
276 * @info: profiling data set to duplicate
277 *
278 * Return newly allocated duplicate on success, %NULL on error.
279 */
280struct gcov_info *gcov_info_dup(struct gcov_info *info)
281{
282 struct gcov_info *dup;
283 struct gcov_ctr_info *dci_ptr; /* dst counter info */
284 struct gcov_ctr_info *sci_ptr; /* src counter info */
285 unsigned int active;
286 unsigned int fi_idx; /* function info idx */
287 unsigned int ct_idx; /* counter type idx */
288 size_t fi_size; /* function info size */
289 size_t cv_size; /* counter values size */
290
291 dup = kmemdup(info, sizeof(*dup), GFP_KERNEL);
292 if (!dup)
293 return NULL;
294
295 dup->next = NULL;
296 dup->filename = NULL;
297 dup->functions = NULL;
298
299 dup->filename = kstrdup(info->filename, GFP_KERNEL);
300 if (!dup->filename)
301 goto err_free;
302
303 dup->functions = kcalloc(info->n_functions,
304 sizeof(struct gcov_fn_info *), GFP_KERNEL);
305 if (!dup->functions)
306 goto err_free;
307
308 active = num_counter_active(info);
309 fi_size = sizeof(struct gcov_fn_info);
310 fi_size += sizeof(struct gcov_ctr_info) * active;
311
312 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
313 dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);
314 if (!dup->functions[fi_idx])
315 goto err_free;
316
317 *(dup->functions[fi_idx]) = *(info->functions[fi_idx]);
318
319 sci_ptr = info->functions[fi_idx]->ctrs;
320 dci_ptr = dup->functions[fi_idx]->ctrs;
321
322 for (ct_idx = 0; ct_idx < active; ct_idx++) {
323
324 cv_size = sizeof(gcov_type) * sci_ptr->num;
325
326 dci_ptr->values = kvmalloc(cv_size, GFP_KERNEL);
327
328 if (!dci_ptr->values)
329 goto err_free;
330
331 dci_ptr->num = sci_ptr->num;
332 memcpy(dci_ptr->values, sci_ptr->values, cv_size);
333
334 sci_ptr++;
335 dci_ptr++;
336 }
337 }
338
339 return dup;
340err_free:
341 gcov_info_free(dup);
342 return NULL;
343}
344
345/**
346 * gcov_info_free - release memory for profiling data set duplicate
347 * @info: profiling data set duplicate to free
348 */
349void gcov_info_free(struct gcov_info *info)
350{
351 unsigned int active;
352 unsigned int fi_idx;
353 unsigned int ct_idx;
354 struct gcov_ctr_info *ci_ptr;
355
356 if (!info->functions)
357 goto free_info;
358
359 active = num_counter_active(info);
360
361 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
362 if (!info->functions[fi_idx])
363 continue;
364
365 ci_ptr = info->functions[fi_idx]->ctrs;
366
367 for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)
368 kvfree(ci_ptr->values);
369
370 kfree(info->functions[fi_idx]);
371 }
372
373free_info:
374 kfree(info->functions);
375 kfree(info->filename);
376 kfree(info);
377}
378
379/**
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
383 *
384 * Returns the number of bytes that were/would have been stored into the buffer.
385 */
386size_t convert_to_gcda(char *buffer, struct gcov_info *info)
387{
388 struct gcov_fn_info *fi_ptr;
389 struct gcov_ctr_info *ci_ptr;
390 unsigned int fi_idx;
391 unsigned int ct_idx;
392 unsigned int cv_idx;
393 size_t pos = 0;
394
395 /* File header. */
396 pos += store_gcov_u32(buffer, pos, GCOV_DATA_MAGIC);
397 pos += store_gcov_u32(buffer, pos, info->version);
398 pos += store_gcov_u32(buffer, pos, info->stamp);
399
400#if (__GNUC__ >= 12)
401 /* Use zero as checksum of the compilation unit. */
402 pos += store_gcov_u32(buffer, pos, 0);
403#endif
404
405 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
406 fi_ptr = info->functions[fi_idx];
407
408 /* Function record. */
409 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION);
410 pos += store_gcov_u32(buffer, pos,
411 GCOV_TAG_FUNCTION_LENGTH * GCOV_UNIT_SIZE);
412 pos += store_gcov_u32(buffer, pos, fi_ptr->ident);
413 pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);
414 pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
415
416 ci_ptr = fi_ptr->ctrs;
417
418 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
419 if (!counter_active(info, ct_idx))
420 continue;
421
422 /* Counter record. */
423 pos += store_gcov_u32(buffer, pos,
424 GCOV_TAG_FOR_COUNTER(ct_idx));
425 pos += store_gcov_u32(buffer, pos,
426 ci_ptr->num * 2 * GCOV_UNIT_SIZE);
427
428 for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {
429 pos += store_gcov_u64(buffer, pos,
430 ci_ptr->values[cv_idx]);
431 }
432
433 ci_ptr++;
434 }
435 }
436
437 return pos;
438}