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