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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/seq_file.h>
19#include <linux/vmalloc.h>
20#include "gcov.h"
21
22#if (__GNUC__ >= 10)
23#define GCOV_COUNTERS 8
24#elif (__GNUC__ >= 7)
25#define GCOV_COUNTERS 9
26#elif (__GNUC__ > 5) || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1)
27#define GCOV_COUNTERS 10
28#elif __GNUC__ == 4 && __GNUC_MINOR__ >= 9
29#define GCOV_COUNTERS 9
30#else
31#define GCOV_COUNTERS 8
32#endif
33
34#define GCOV_TAG_FUNCTION_LENGTH 3
35
36static struct gcov_info *gcov_info_head;
37
38/**
39 * struct gcov_ctr_info - information about counters for a single function
40 * @num: number of counter values for this type
41 * @values: array of counter values for this type
42 *
43 * This data is generated by gcc during compilation and doesn't change
44 * at run-time with the exception of the values array.
45 */
46struct gcov_ctr_info {
47 unsigned int num;
48 gcov_type *values;
49};
50
51/**
52 * struct gcov_fn_info - profiling meta data per function
53 * @key: comdat key
54 * @ident: unique ident of function
55 * @lineno_checksum: function lineo_checksum
56 * @cfg_checksum: function cfg checksum
57 * @ctrs: instrumented counters
58 *
59 * This data is generated by gcc during compilation and doesn't change
60 * at run-time.
61 *
62 * Information about a single function. This uses the trailing array
63 * idiom. The number of counters is determined from the merge pointer
64 * array in gcov_info. The key is used to detect which of a set of
65 * comdat functions was selected -- it points to the gcov_info object
66 * of the object file containing the selected comdat function.
67 */
68struct gcov_fn_info {
69 const struct gcov_info *key;
70 unsigned int ident;
71 unsigned int lineno_checksum;
72 unsigned int cfg_checksum;
73 struct gcov_ctr_info ctrs[];
74};
75
76/**
77 * struct gcov_info - profiling data per object file
78 * @version: gcov version magic indicating the gcc version used for compilation
79 * @next: list head for a singly-linked list
80 * @stamp: uniquifying time stamp
81 * @filename: name of the associated gcov data file
82 * @merge: merge functions (null for unused counter type)
83 * @n_functions: number of instrumented functions
84 * @functions: pointer to pointers to function information
85 *
86 * This data is generated by gcc during compilation and doesn't change
87 * at run-time with the exception of the next pointer.
88 */
89struct gcov_info {
90 unsigned int version;
91 struct gcov_info *next;
92 unsigned int stamp;
93 const char *filename;
94 void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
95 unsigned int n_functions;
96 struct gcov_fn_info **functions;
97};
98
99/**
100 * gcov_info_filename - return info filename
101 * @info: profiling data set
102 */
103const char *gcov_info_filename(struct gcov_info *info)
104{
105 return info->filename;
106}
107
108/**
109 * gcov_info_version - return info version
110 * @info: profiling data set
111 */
112unsigned int gcov_info_version(struct gcov_info *info)
113{
114 return info->version;
115}
116
117/**
118 * gcov_info_next - return next profiling data set
119 * @info: profiling data set
120 *
121 * Returns next gcov_info following @info or first gcov_info in the chain if
122 * @info is %NULL.
123 */
124struct gcov_info *gcov_info_next(struct gcov_info *info)
125{
126 if (!info)
127 return gcov_info_head;
128
129 return info->next;
130}
131
132/**
133 * gcov_info_link - link/add profiling data set to the list
134 * @info: profiling data set
135 */
136void gcov_info_link(struct gcov_info *info)
137{
138 info->next = gcov_info_head;
139 gcov_info_head = info;
140}
141
142/**
143 * gcov_info_unlink - unlink/remove profiling data set from the list
144 * @prev: previous profiling data set
145 * @info: profiling data set
146 */
147void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
148{
149 if (prev)
150 prev->next = info->next;
151 else
152 gcov_info_head = info->next;
153}
154
155/**
156 * gcov_info_within_module - check if a profiling data set belongs to a module
157 * @info: profiling data set
158 * @mod: module
159 *
160 * Returns true if profiling data belongs module, false otherwise.
161 */
162bool gcov_info_within_module(struct gcov_info *info, struct module *mod)
163{
164 return within_module((unsigned long)info, mod);
165}
166
167/* Symbolic links to be created for each profiling data file. */
168const struct gcov_link gcov_link[] = {
169 { OBJ_TREE, "gcno" }, /* Link to .gcno file in $(objtree). */
170 { 0, NULL},
171};
172
173/*
174 * Determine whether a counter is active. Doesn't change at run-time.
175 */
176static int counter_active(struct gcov_info *info, unsigned int type)
177{
178 return info->merge[type] ? 1 : 0;
179}
180
181/* Determine number of active counters. Based on gcc magic. */
182static unsigned int num_counter_active(struct gcov_info *info)
183{
184 unsigned int i;
185 unsigned int result = 0;
186
187 for (i = 0; i < GCOV_COUNTERS; i++) {
188 if (counter_active(info, i))
189 result++;
190 }
191 return result;
192}
193
194/**
195 * gcov_info_reset - reset profiling data to zero
196 * @info: profiling data set
197 */
198void gcov_info_reset(struct gcov_info *info)
199{
200 struct gcov_ctr_info *ci_ptr;
201 unsigned int fi_idx;
202 unsigned int ct_idx;
203
204 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
205 ci_ptr = info->functions[fi_idx]->ctrs;
206
207 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
208 if (!counter_active(info, ct_idx))
209 continue;
210
211 memset(ci_ptr->values, 0,
212 sizeof(gcov_type) * ci_ptr->num);
213 ci_ptr++;
214 }
215 }
216}
217
218/**
219 * gcov_info_is_compatible - check if profiling data can be added
220 * @info1: first profiling data set
221 * @info2: second profiling data set
222 *
223 * Returns non-zero if profiling data can be added, zero otherwise.
224 */
225int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
226{
227 return (info1->stamp == info2->stamp);
228}
229
230/**
231 * gcov_info_add - add up profiling data
232 * @dest: profiling data set to which data is added
233 * @source: profiling data set which is added
234 *
235 * Adds profiling counts of @source to @dest.
236 */
237void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
238{
239 struct gcov_ctr_info *dci_ptr;
240 struct gcov_ctr_info *sci_ptr;
241 unsigned int fi_idx;
242 unsigned int ct_idx;
243 unsigned int val_idx;
244
245 for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {
246 dci_ptr = dst->functions[fi_idx]->ctrs;
247 sci_ptr = src->functions[fi_idx]->ctrs;
248
249 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
250 if (!counter_active(src, ct_idx))
251 continue;
252
253 for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)
254 dci_ptr->values[val_idx] +=
255 sci_ptr->values[val_idx];
256
257 dci_ptr++;
258 sci_ptr++;
259 }
260 }
261}
262
263/**
264 * gcov_info_dup - duplicate profiling data set
265 * @info: profiling data set to duplicate
266 *
267 * Return newly allocated duplicate on success, %NULL on error.
268 */
269struct gcov_info *gcov_info_dup(struct gcov_info *info)
270{
271 struct gcov_info *dup;
272 struct gcov_ctr_info *dci_ptr; /* dst counter info */
273 struct gcov_ctr_info *sci_ptr; /* src counter info */
274 unsigned int active;
275 unsigned int fi_idx; /* function info idx */
276 unsigned int ct_idx; /* counter type idx */
277 size_t fi_size; /* function info size */
278 size_t cv_size; /* counter values size */
279
280 dup = kmemdup(info, sizeof(*dup), GFP_KERNEL);
281 if (!dup)
282 return NULL;
283
284 dup->next = NULL;
285 dup->filename = NULL;
286 dup->functions = NULL;
287
288 dup->filename = kstrdup(info->filename, GFP_KERNEL);
289 if (!dup->filename)
290 goto err_free;
291
292 dup->functions = kcalloc(info->n_functions,
293 sizeof(struct gcov_fn_info *), GFP_KERNEL);
294 if (!dup->functions)
295 goto err_free;
296
297 active = num_counter_active(info);
298 fi_size = sizeof(struct gcov_fn_info);
299 fi_size += sizeof(struct gcov_ctr_info) * active;
300
301 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
302 dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);
303 if (!dup->functions[fi_idx])
304 goto err_free;
305
306 *(dup->functions[fi_idx]) = *(info->functions[fi_idx]);
307
308 sci_ptr = info->functions[fi_idx]->ctrs;
309 dci_ptr = dup->functions[fi_idx]->ctrs;
310
311 for (ct_idx = 0; ct_idx < active; ct_idx++) {
312
313 cv_size = sizeof(gcov_type) * sci_ptr->num;
314
315 dci_ptr->values = vmalloc(cv_size);
316
317 if (!dci_ptr->values)
318 goto err_free;
319
320 dci_ptr->num = sci_ptr->num;
321 memcpy(dci_ptr->values, sci_ptr->values, cv_size);
322
323 sci_ptr++;
324 dci_ptr++;
325 }
326 }
327
328 return dup;
329err_free:
330 gcov_info_free(dup);
331 return NULL;
332}
333
334/**
335 * gcov_info_free - release memory for profiling data set duplicate
336 * @info: profiling data set duplicate to free
337 */
338void gcov_info_free(struct gcov_info *info)
339{
340 unsigned int active;
341 unsigned int fi_idx;
342 unsigned int ct_idx;
343 struct gcov_ctr_info *ci_ptr;
344
345 if (!info->functions)
346 goto free_info;
347
348 active = num_counter_active(info);
349
350 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
351 if (!info->functions[fi_idx])
352 continue;
353
354 ci_ptr = info->functions[fi_idx]->ctrs;
355
356 for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)
357 vfree(ci_ptr->values);
358
359 kfree(info->functions[fi_idx]);
360 }
361
362free_info:
363 kfree(info->functions);
364 kfree(info->filename);
365 kfree(info);
366}
367
368#define ITER_STRIDE PAGE_SIZE
369
370/**
371 * struct gcov_iterator - specifies current file position in logical records
372 * @info: associated profiling data
373 * @buffer: buffer containing file data
374 * @size: size of buffer
375 * @pos: current position in file
376 */
377struct gcov_iterator {
378 struct gcov_info *info;
379 void *buffer;
380 size_t size;
381 loff_t pos;
382};
383
384/**
385 * store_gcov_u32 - store 32 bit number in gcov format to buffer
386 * @buffer: target buffer or NULL
387 * @off: offset into the buffer
388 * @v: value to be stored
389 *
390 * Number format defined by gcc: numbers are recorded in the 32 bit
391 * unsigned binary form of the endianness of the machine generating the
392 * file. Returns the number of bytes stored. If @buffer is %NULL, doesn't
393 * store anything.
394 */
395static size_t store_gcov_u32(void *buffer, size_t off, u32 v)
396{
397 u32 *data;
398
399 if (buffer) {
400 data = buffer + off;
401 *data = v;
402 }
403
404 return sizeof(*data);
405}
406
407/**
408 * store_gcov_u64 - store 64 bit number in gcov format to buffer
409 * @buffer: target buffer or NULL
410 * @off: offset into the buffer
411 * @v: value to be stored
412 *
413 * Number format defined by gcc: numbers are recorded in the 32 bit
414 * unsigned binary form of the endianness of the machine generating the
415 * file. 64 bit numbers are stored as two 32 bit numbers, the low part
416 * first. Returns the number of bytes stored. If @buffer is %NULL, doesn't store
417 * anything.
418 */
419static size_t store_gcov_u64(void *buffer, size_t off, u64 v)
420{
421 u32 *data;
422
423 if (buffer) {
424 data = buffer + off;
425
426 data[0] = (v & 0xffffffffUL);
427 data[1] = (v >> 32);
428 }
429
430 return sizeof(*data) * 2;
431}
432
433/**
434 * convert_to_gcda - convert profiling data set to gcda file format
435 * @buffer: the buffer to store file data or %NULL if no data should be stored
436 * @info: profiling data set to be converted
437 *
438 * Returns the number of bytes that were/would have been stored into the buffer.
439 */
440static size_t convert_to_gcda(char *buffer, struct gcov_info *info)
441{
442 struct gcov_fn_info *fi_ptr;
443 struct gcov_ctr_info *ci_ptr;
444 unsigned int fi_idx;
445 unsigned int ct_idx;
446 unsigned int cv_idx;
447 size_t pos = 0;
448
449 /* File header. */
450 pos += store_gcov_u32(buffer, pos, GCOV_DATA_MAGIC);
451 pos += store_gcov_u32(buffer, pos, info->version);
452 pos += store_gcov_u32(buffer, pos, info->stamp);
453
454 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
455 fi_ptr = info->functions[fi_idx];
456
457 /* Function record. */
458 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION);
459 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION_LENGTH);
460 pos += store_gcov_u32(buffer, pos, fi_ptr->ident);
461 pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);
462 pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
463
464 ci_ptr = fi_ptr->ctrs;
465
466 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
467 if (!counter_active(info, ct_idx))
468 continue;
469
470 /* Counter record. */
471 pos += store_gcov_u32(buffer, pos,
472 GCOV_TAG_FOR_COUNTER(ct_idx));
473 pos += store_gcov_u32(buffer, pos, ci_ptr->num * 2);
474
475 for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {
476 pos += store_gcov_u64(buffer, pos,
477 ci_ptr->values[cv_idx]);
478 }
479
480 ci_ptr++;
481 }
482 }
483
484 return pos;
485}
486
487/**
488 * gcov_iter_new - allocate and initialize profiling data iterator
489 * @info: profiling data set to be iterated
490 *
491 * Return file iterator on success, %NULL otherwise.
492 */
493struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
494{
495 struct gcov_iterator *iter;
496
497 iter = kzalloc(sizeof(struct gcov_iterator), GFP_KERNEL);
498 if (!iter)
499 goto err_free;
500
501 iter->info = info;
502 /* Dry-run to get the actual buffer size. */
503 iter->size = convert_to_gcda(NULL, info);
504 iter->buffer = vmalloc(iter->size);
505 if (!iter->buffer)
506 goto err_free;
507
508 convert_to_gcda(iter->buffer, info);
509
510 return iter;
511
512err_free:
513 kfree(iter);
514 return NULL;
515}
516
517
518/**
519 * gcov_iter_get_info - return profiling data set for given file iterator
520 * @iter: file iterator
521 */
522void gcov_iter_free(struct gcov_iterator *iter)
523{
524 vfree(iter->buffer);
525 kfree(iter);
526}
527
528/**
529 * gcov_iter_get_info - return profiling data set for given file iterator
530 * @iter: file iterator
531 */
532struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter)
533{
534 return iter->info;
535}
536
537/**
538 * gcov_iter_start - reset file iterator to starting position
539 * @iter: file iterator
540 */
541void gcov_iter_start(struct gcov_iterator *iter)
542{
543 iter->pos = 0;
544}
545
546/**
547 * gcov_iter_next - advance file iterator to next logical record
548 * @iter: file iterator
549 *
550 * Return zero if new position is valid, non-zero if iterator has reached end.
551 */
552int gcov_iter_next(struct gcov_iterator *iter)
553{
554 if (iter->pos < iter->size)
555 iter->pos += ITER_STRIDE;
556
557 if (iter->pos >= iter->size)
558 return -EINVAL;
559
560 return 0;
561}
562
563/**
564 * gcov_iter_write - write data for current pos to seq_file
565 * @iter: file iterator
566 * @seq: seq_file handle
567 *
568 * Return zero on success, non-zero otherwise.
569 */
570int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq)
571{
572 size_t len;
573
574 if (iter->pos >= iter->size)
575 return -EINVAL;
576
577 len = ITER_STRIDE;
578 if (iter->pos + len > iter->size)
579 len = iter->size - iter->pos;
580
581 seq_write(seq, iter->buffer + iter->pos, len);
582
583 return 0;
584}
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__ >= 10)
22#define GCOV_COUNTERS 8
23#elif (__GNUC__ >= 7)
24#define GCOV_COUNTERS 9
25#elif (__GNUC__ > 5) || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1)
26#define GCOV_COUNTERS 10
27#else
28#define GCOV_COUNTERS 9
29#endif
30
31#define GCOV_TAG_FUNCTION_LENGTH 3
32
33static struct gcov_info *gcov_info_head;
34
35/**
36 * struct gcov_ctr_info - information about counters for a single function
37 * @num: number of counter values for this type
38 * @values: array of counter values for this type
39 *
40 * This data is generated by gcc during compilation and doesn't change
41 * at run-time with the exception of the values array.
42 */
43struct gcov_ctr_info {
44 unsigned int num;
45 gcov_type *values;
46};
47
48/**
49 * struct gcov_fn_info - profiling meta data per function
50 * @key: comdat key
51 * @ident: unique ident of function
52 * @lineno_checksum: function lineo_checksum
53 * @cfg_checksum: function cfg checksum
54 * @ctrs: instrumented counters
55 *
56 * This data is generated by gcc during compilation and doesn't change
57 * at run-time.
58 *
59 * Information about a single function. This uses the trailing array
60 * idiom. The number of counters is determined from the merge pointer
61 * array in gcov_info. The key is used to detect which of a set of
62 * comdat functions was selected -- it points to the gcov_info object
63 * of the object file containing the selected comdat function.
64 */
65struct gcov_fn_info {
66 const struct gcov_info *key;
67 unsigned int ident;
68 unsigned int lineno_checksum;
69 unsigned int cfg_checksum;
70 struct gcov_ctr_info ctrs[];
71};
72
73/**
74 * struct gcov_info - profiling data per object file
75 * @version: gcov version magic indicating the gcc version used for compilation
76 * @next: list head for a singly-linked list
77 * @stamp: uniquifying time stamp
78 * @filename: name of the associated gcov data file
79 * @merge: merge functions (null for unused counter type)
80 * @n_functions: number of instrumented functions
81 * @functions: pointer to pointers to function information
82 *
83 * This data is generated by gcc during compilation and doesn't change
84 * at run-time with the exception of the next pointer.
85 */
86struct gcov_info {
87 unsigned int version;
88 struct gcov_info *next;
89 unsigned int stamp;
90 const char *filename;
91 void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
92 unsigned int n_functions;
93 struct gcov_fn_info **functions;
94};
95
96/**
97 * gcov_info_filename - return info filename
98 * @info: profiling data set
99 */
100const char *gcov_info_filename(struct gcov_info *info)
101{
102 return info->filename;
103}
104
105/**
106 * gcov_info_version - return info version
107 * @info: profiling data set
108 */
109unsigned int gcov_info_version(struct gcov_info *info)
110{
111 return info->version;
112}
113
114/**
115 * gcov_info_next - return next profiling data set
116 * @info: profiling data set
117 *
118 * Returns next gcov_info following @info or first gcov_info in the chain if
119 * @info is %NULL.
120 */
121struct gcov_info *gcov_info_next(struct gcov_info *info)
122{
123 if (!info)
124 return gcov_info_head;
125
126 return info->next;
127}
128
129/**
130 * gcov_info_link - link/add profiling data set to the list
131 * @info: profiling data set
132 */
133void gcov_info_link(struct gcov_info *info)
134{
135 info->next = gcov_info_head;
136 gcov_info_head = info;
137}
138
139/**
140 * gcov_info_unlink - unlink/remove profiling data set from the list
141 * @prev: previous profiling data set
142 * @info: profiling data set
143 */
144void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
145{
146 if (prev)
147 prev->next = info->next;
148 else
149 gcov_info_head = info->next;
150}
151
152/**
153 * gcov_info_within_module - check if a profiling data set belongs to a module
154 * @info: profiling data set
155 * @mod: module
156 *
157 * Returns true if profiling data belongs module, false otherwise.
158 */
159bool gcov_info_within_module(struct gcov_info *info, struct module *mod)
160{
161 return within_module((unsigned long)info, mod);
162}
163
164/* Symbolic links to be created for each profiling data file. */
165const struct gcov_link gcov_link[] = {
166 { OBJ_TREE, "gcno" }, /* Link to .gcno file in $(objtree). */
167 { 0, NULL},
168};
169
170/*
171 * Determine whether a counter is active. Doesn't change at run-time.
172 */
173static int counter_active(struct gcov_info *info, unsigned int type)
174{
175 return info->merge[type] ? 1 : 0;
176}
177
178/* Determine number of active counters. Based on gcc magic. */
179static unsigned int num_counter_active(struct gcov_info *info)
180{
181 unsigned int i;
182 unsigned int result = 0;
183
184 for (i = 0; i < GCOV_COUNTERS; i++) {
185 if (counter_active(info, i))
186 result++;
187 }
188 return result;
189}
190
191/**
192 * gcov_info_reset - reset profiling data to zero
193 * @info: profiling data set
194 */
195void gcov_info_reset(struct gcov_info *info)
196{
197 struct gcov_ctr_info *ci_ptr;
198 unsigned int fi_idx;
199 unsigned int ct_idx;
200
201 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
202 ci_ptr = info->functions[fi_idx]->ctrs;
203
204 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
205 if (!counter_active(info, ct_idx))
206 continue;
207
208 memset(ci_ptr->values, 0,
209 sizeof(gcov_type) * ci_ptr->num);
210 ci_ptr++;
211 }
212 }
213}
214
215/**
216 * gcov_info_is_compatible - check if profiling data can be added
217 * @info1: first profiling data set
218 * @info2: second profiling data set
219 *
220 * Returns non-zero if profiling data can be added, zero otherwise.
221 */
222int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
223{
224 return (info1->stamp == info2->stamp);
225}
226
227/**
228 * gcov_info_add - add up profiling data
229 * @dst: profiling data set to which data is added
230 * @src: profiling data set which is added
231 *
232 * Adds profiling counts of @src to @dst.
233 */
234void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
235{
236 struct gcov_ctr_info *dci_ptr;
237 struct gcov_ctr_info *sci_ptr;
238 unsigned int fi_idx;
239 unsigned int ct_idx;
240 unsigned int val_idx;
241
242 for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {
243 dci_ptr = dst->functions[fi_idx]->ctrs;
244 sci_ptr = src->functions[fi_idx]->ctrs;
245
246 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
247 if (!counter_active(src, ct_idx))
248 continue;
249
250 for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)
251 dci_ptr->values[val_idx] +=
252 sci_ptr->values[val_idx];
253
254 dci_ptr++;
255 sci_ptr++;
256 }
257 }
258}
259
260/**
261 * gcov_info_dup - duplicate profiling data set
262 * @info: profiling data set to duplicate
263 *
264 * Return newly allocated duplicate on success, %NULL on error.
265 */
266struct gcov_info *gcov_info_dup(struct gcov_info *info)
267{
268 struct gcov_info *dup;
269 struct gcov_ctr_info *dci_ptr; /* dst counter info */
270 struct gcov_ctr_info *sci_ptr; /* src counter info */
271 unsigned int active;
272 unsigned int fi_idx; /* function info idx */
273 unsigned int ct_idx; /* counter type idx */
274 size_t fi_size; /* function info size */
275 size_t cv_size; /* counter values size */
276
277 dup = kmemdup(info, sizeof(*dup), GFP_KERNEL);
278 if (!dup)
279 return NULL;
280
281 dup->next = NULL;
282 dup->filename = NULL;
283 dup->functions = NULL;
284
285 dup->filename = kstrdup(info->filename, GFP_KERNEL);
286 if (!dup->filename)
287 goto err_free;
288
289 dup->functions = kcalloc(info->n_functions,
290 sizeof(struct gcov_fn_info *), GFP_KERNEL);
291 if (!dup->functions)
292 goto err_free;
293
294 active = num_counter_active(info);
295 fi_size = sizeof(struct gcov_fn_info);
296 fi_size += sizeof(struct gcov_ctr_info) * active;
297
298 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
299 dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);
300 if (!dup->functions[fi_idx])
301 goto err_free;
302
303 *(dup->functions[fi_idx]) = *(info->functions[fi_idx]);
304
305 sci_ptr = info->functions[fi_idx]->ctrs;
306 dci_ptr = dup->functions[fi_idx]->ctrs;
307
308 for (ct_idx = 0; ct_idx < active; ct_idx++) {
309
310 cv_size = sizeof(gcov_type) * sci_ptr->num;
311
312 dci_ptr->values = kvmalloc(cv_size, GFP_KERNEL);
313
314 if (!dci_ptr->values)
315 goto err_free;
316
317 dci_ptr->num = sci_ptr->num;
318 memcpy(dci_ptr->values, sci_ptr->values, cv_size);
319
320 sci_ptr++;
321 dci_ptr++;
322 }
323 }
324
325 return dup;
326err_free:
327 gcov_info_free(dup);
328 return NULL;
329}
330
331/**
332 * gcov_info_free - release memory for profiling data set duplicate
333 * @info: profiling data set duplicate to free
334 */
335void gcov_info_free(struct gcov_info *info)
336{
337 unsigned int active;
338 unsigned int fi_idx;
339 unsigned int ct_idx;
340 struct gcov_ctr_info *ci_ptr;
341
342 if (!info->functions)
343 goto free_info;
344
345 active = num_counter_active(info);
346
347 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
348 if (!info->functions[fi_idx])
349 continue;
350
351 ci_ptr = info->functions[fi_idx]->ctrs;
352
353 for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)
354 kvfree(ci_ptr->values);
355
356 kfree(info->functions[fi_idx]);
357 }
358
359free_info:
360 kfree(info->functions);
361 kfree(info->filename);
362 kfree(info);
363}
364
365/**
366 * convert_to_gcda - convert profiling data set to gcda file format
367 * @buffer: the buffer to store file data or %NULL if no data should be stored
368 * @info: profiling data set to be converted
369 *
370 * Returns the number of bytes that were/would have been stored into the buffer.
371 */
372size_t convert_to_gcda(char *buffer, struct gcov_info *info)
373{
374 struct gcov_fn_info *fi_ptr;
375 struct gcov_ctr_info *ci_ptr;
376 unsigned int fi_idx;
377 unsigned int ct_idx;
378 unsigned int cv_idx;
379 size_t pos = 0;
380
381 /* File header. */
382 pos += store_gcov_u32(buffer, pos, GCOV_DATA_MAGIC);
383 pos += store_gcov_u32(buffer, pos, info->version);
384 pos += store_gcov_u32(buffer, pos, info->stamp);
385
386 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
387 fi_ptr = info->functions[fi_idx];
388
389 /* Function record. */
390 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION);
391 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION_LENGTH);
392 pos += store_gcov_u32(buffer, pos, fi_ptr->ident);
393 pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);
394 pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
395
396 ci_ptr = fi_ptr->ctrs;
397
398 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
399 if (!counter_active(info, ct_idx))
400 continue;
401
402 /* Counter record. */
403 pos += store_gcov_u32(buffer, pos,
404 GCOV_TAG_FOR_COUNTER(ct_idx));
405 pos += store_gcov_u32(buffer, pos, ci_ptr->num * 2);
406
407 for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {
408 pos += store_gcov_u64(buffer, pos,
409 ci_ptr->values[cv_idx]);
410 }
411
412 ci_ptr++;
413 }
414 }
415
416 return pos;
417}