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44
45#define pr_fmt(fmt) "gcov: " fmt
46
47#include <linux/kernel.h>
48#include <linux/list.h>
49#include <linux/printk.h>
50#include <linux/ratelimit.h>
51#include <linux/seq_file.h>
52#include <linux/slab.h>
53#include <linux/vmalloc.h>
54#include "gcov.h"
55
56typedef void (*llvm_gcov_callback)(void);
57
58struct gcov_info {
59 struct list_head head;
60
61 const char *filename;
62 unsigned int version;
63 u32 checksum;
64
65 struct list_head functions;
66};
67
68struct gcov_fn_info {
69 struct list_head head;
70
71 u32 ident;
72 u32 checksum;
73 u8 use_extra_checksum;
74 u32 cfg_checksum;
75
76 u32 num_counters;
77 u64 *counters;
78 const char *function_name;
79};
80
81static struct gcov_info *current_info;
82
83static LIST_HEAD(clang_gcov_list);
84
85void llvm_gcov_init(llvm_gcov_callback writeout, llvm_gcov_callback flush)
86{
87 struct gcov_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
88
89 if (!info)
90 return;
91
92 INIT_LIST_HEAD(&info->head);
93 INIT_LIST_HEAD(&info->functions);
94
95 mutex_lock(&gcov_lock);
96
97 list_add_tail(&info->head, &clang_gcov_list);
98 current_info = info;
99 writeout();
100 current_info = NULL;
101 if (gcov_events_enabled)
102 gcov_event(GCOV_ADD, info);
103
104 mutex_unlock(&gcov_lock);
105}
106EXPORT_SYMBOL(llvm_gcov_init);
107
108void llvm_gcda_start_file(const char *orig_filename, const char version[4],
109 u32 checksum)
110{
111 current_info->filename = orig_filename;
112 memcpy(¤t_info->version, version, sizeof(current_info->version));
113 current_info->checksum = checksum;
114}
115EXPORT_SYMBOL(llvm_gcda_start_file);
116
117void llvm_gcda_emit_function(u32 ident, const char *function_name,
118 u32 func_checksum, u8 use_extra_checksum, u32 cfg_checksum)
119{
120 struct gcov_fn_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
121
122 if (!info)
123 return;
124
125 INIT_LIST_HEAD(&info->head);
126 info->ident = ident;
127 info->checksum = func_checksum;
128 info->use_extra_checksum = use_extra_checksum;
129 info->cfg_checksum = cfg_checksum;
130 if (function_name)
131 info->function_name = kstrdup(function_name, GFP_KERNEL);
132
133 list_add_tail(&info->head, ¤t_info->functions);
134}
135EXPORT_SYMBOL(llvm_gcda_emit_function);
136
137void llvm_gcda_emit_arcs(u32 num_counters, u64 *counters)
138{
139 struct gcov_fn_info *info = list_last_entry(¤t_info->functions,
140 struct gcov_fn_info, head);
141
142 info->num_counters = num_counters;
143 info->counters = counters;
144}
145EXPORT_SYMBOL(llvm_gcda_emit_arcs);
146
147void llvm_gcda_summary_info(void)
148{
149}
150EXPORT_SYMBOL(llvm_gcda_summary_info);
151
152void llvm_gcda_end_file(void)
153{
154}
155EXPORT_SYMBOL(llvm_gcda_end_file);
156
157
158
159
160
161const char *gcov_info_filename(struct gcov_info *info)
162{
163 return info->filename;
164}
165
166
167
168
169
170unsigned int gcov_info_version(struct gcov_info *info)
171{
172 return info->version;
173}
174
175
176
177
178
179
180
181
182struct gcov_info *gcov_info_next(struct gcov_info *info)
183{
184 if (!info)
185 return list_first_entry_or_null(&clang_gcov_list,
186 struct gcov_info, head);
187 if (list_is_last(&info->head, &clang_gcov_list))
188 return NULL;
189 return list_next_entry(info, head);
190}
191
192
193
194
195
196void gcov_info_link(struct gcov_info *info)
197{
198 list_add_tail(&info->head, &clang_gcov_list);
199}
200
201
202
203
204
205
206void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
207{
208
209 __list_del_entry(&info->head);
210}
211
212
213
214
215
216
217
218
219bool gcov_info_within_module(struct gcov_info *info, struct module *mod)
220{
221 return within_module((unsigned long)info->filename, mod);
222}
223
224
225const struct gcov_link gcov_link[] = {
226 { OBJ_TREE, "gcno" },
227 { 0, NULL},
228};
229
230
231
232
233
234void gcov_info_reset(struct gcov_info *info)
235{
236 struct gcov_fn_info *fn;
237
238 list_for_each_entry(fn, &info->functions, head)
239 memset(fn->counters, 0,
240 sizeof(fn->counters[0]) * fn->num_counters);
241}
242
243
244
245
246
247
248
249
250int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
251{
252 struct gcov_fn_info *fn_ptr1 = list_first_entry_or_null(
253 &info1->functions, struct gcov_fn_info, head);
254 struct gcov_fn_info *fn_ptr2 = list_first_entry_or_null(
255 &info2->functions, struct gcov_fn_info, head);
256
257 if (info1->checksum != info2->checksum)
258 return false;
259 if (!fn_ptr1)
260 return fn_ptr1 == fn_ptr2;
261 while (!list_is_last(&fn_ptr1->head, &info1->functions) &&
262 !list_is_last(&fn_ptr2->head, &info2->functions)) {
263 if (fn_ptr1->checksum != fn_ptr2->checksum)
264 return false;
265 if (fn_ptr1->use_extra_checksum != fn_ptr2->use_extra_checksum)
266 return false;
267 if (fn_ptr1->use_extra_checksum &&
268 fn_ptr1->cfg_checksum != fn_ptr2->cfg_checksum)
269 return false;
270 fn_ptr1 = list_next_entry(fn_ptr1, head);
271 fn_ptr2 = list_next_entry(fn_ptr2, head);
272 }
273 return list_is_last(&fn_ptr1->head, &info1->functions) &&
274 list_is_last(&fn_ptr2->head, &info2->functions);
275}
276
277
278
279
280
281
282
283
284void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
285{
286 struct gcov_fn_info *dfn_ptr;
287 struct gcov_fn_info *sfn_ptr = list_first_entry_or_null(&src->functions,
288 struct gcov_fn_info, head);
289
290 list_for_each_entry(dfn_ptr, &dst->functions, head) {
291 u32 i;
292
293 for (i = 0; i < sfn_ptr->num_counters; i++)
294 dfn_ptr->counters[i] += sfn_ptr->counters[i];
295 }
296}
297
298static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
299{
300 size_t cv_size;
301 struct gcov_fn_info *fn_dup = kmemdup(fn, sizeof(*fn),
302 GFP_KERNEL);
303 if (!fn_dup)
304 return NULL;
305 INIT_LIST_HEAD(&fn_dup->head);
306
307 fn_dup->function_name = kstrdup(fn->function_name, GFP_KERNEL);
308 if (!fn_dup->function_name)
309 goto err_name;
310
311 cv_size = fn->num_counters * sizeof(fn->counters[0]);
312 fn_dup->counters = vmalloc(cv_size);
313 if (!fn_dup->counters)
314 goto err_counters;
315 memcpy(fn_dup->counters, fn->counters, cv_size);
316
317 return fn_dup;
318
319err_counters:
320 kfree(fn_dup->function_name);
321err_name:
322 kfree(fn_dup);
323 return NULL;
324}
325
326
327
328
329
330
331
332struct gcov_info *gcov_info_dup(struct gcov_info *info)
333{
334 struct gcov_info *dup;
335 struct gcov_fn_info *fn;
336
337 dup = kmemdup(info, sizeof(*dup), GFP_KERNEL);
338 if (!dup)
339 return NULL;
340 INIT_LIST_HEAD(&dup->head);
341 INIT_LIST_HEAD(&dup->functions);
342 dup->filename = kstrdup(info->filename, GFP_KERNEL);
343 if (!dup->filename)
344 goto err;
345
346 list_for_each_entry(fn, &info->functions, head) {
347 struct gcov_fn_info *fn_dup = gcov_fn_info_dup(fn);
348
349 if (!fn_dup)
350 goto err;
351 list_add_tail(&fn_dup->head, &dup->functions);
352 }
353
354 return dup;
355
356err:
357 gcov_info_free(dup);
358 return NULL;
359}
360
361
362
363
364
365void gcov_info_free(struct gcov_info *info)
366{
367 struct gcov_fn_info *fn, *tmp;
368
369 list_for_each_entry_safe(fn, tmp, &info->functions, head) {
370 kfree(fn->function_name);
371 vfree(fn->counters);
372 list_del(&fn->head);
373 kfree(fn);
374 }
375 kfree(info->filename);
376 kfree(info);
377}
378
379#define ITER_STRIDE PAGE_SIZE
380
381
382
383
384
385
386
387
388struct gcov_iterator {
389 struct gcov_info *info;
390 void *buffer;
391 size_t size;
392 loff_t pos;
393};
394
395
396
397
398
399
400
401
402
403
404
405
406static size_t store_gcov_u32(void *buffer, size_t off, u32 v)
407{
408 u32 *data;
409
410 if (buffer) {
411 data = buffer + off;
412 *data = v;
413 }
414
415 return sizeof(*data);
416}
417
418
419
420
421
422
423
424
425
426
427
428
429
430static size_t store_gcov_u64(void *buffer, size_t off, u64 v)
431{
432 u32 *data;
433
434 if (buffer) {
435 data = buffer + off;
436
437 data[0] = (v & 0xffffffffUL);
438 data[1] = (v >> 32);
439 }
440
441 return sizeof(*data) * 2;
442}
443
444
445
446
447
448
449
450
451static size_t convert_to_gcda(char *buffer, struct gcov_info *info)
452{
453 struct gcov_fn_info *fi_ptr;
454 size_t pos = 0;
455
456
457 pos += store_gcov_u32(buffer, pos, GCOV_DATA_MAGIC);
458 pos += store_gcov_u32(buffer, pos, info->version);
459 pos += store_gcov_u32(buffer, pos, info->checksum);
460
461 list_for_each_entry(fi_ptr, &info->functions, head) {
462 u32 i;
463 u32 len = 2;
464
465 if (fi_ptr->use_extra_checksum)
466 len++;
467
468 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION);
469 pos += store_gcov_u32(buffer, pos, len);
470 pos += store_gcov_u32(buffer, pos, fi_ptr->ident);
471 pos += store_gcov_u32(buffer, pos, fi_ptr->checksum);
472 if (fi_ptr->use_extra_checksum)
473 pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
474
475 pos += store_gcov_u32(buffer, pos, GCOV_TAG_COUNTER_BASE);
476 pos += store_gcov_u32(buffer, pos, fi_ptr->num_counters * 2);
477 for (i = 0; i < fi_ptr->num_counters; i++)
478 pos += store_gcov_u64(buffer, pos, fi_ptr->counters[i]);
479 }
480
481 return pos;
482}
483
484
485
486
487
488
489
490struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
491{
492 struct gcov_iterator *iter;
493
494 iter = kzalloc(sizeof(struct gcov_iterator), GFP_KERNEL);
495 if (!iter)
496 goto err_free;
497
498 iter->info = info;
499
500 iter->size = convert_to_gcda(NULL, info);
501 iter->buffer = vmalloc(iter->size);
502 if (!iter->buffer)
503 goto err_free;
504
505 convert_to_gcda(iter->buffer, info);
506
507 return iter;
508
509err_free:
510 kfree(iter);
511 return NULL;
512}
513
514
515
516
517
518
519void gcov_iter_free(struct gcov_iterator *iter)
520{
521 vfree(iter->buffer);
522 kfree(iter);
523}
524
525
526
527
528
529struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter)
530{
531 return iter->info;
532}
533
534
535
536
537
538void gcov_iter_start(struct gcov_iterator *iter)
539{
540 iter->pos = 0;
541}
542
543
544
545
546
547
548
549int gcov_iter_next(struct gcov_iterator *iter)
550{
551 if (iter->pos < iter->size)
552 iter->pos += ITER_STRIDE;
553
554 if (iter->pos >= iter->size)
555 return -EINVAL;
556
557 return 0;
558}
559
560
561
562
563
564
565
566
567int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq)
568{
569 size_t len;
570
571 if (iter->pos >= iter->size)
572 return -EINVAL;
573
574 len = ITER_STRIDE;
575 if (iter->pos + len > iter->size)
576 len = iter->size - iter->pos;
577
578 seq_write(seq, iter->buffer + iter->pos, len);
579
580 return 0;
581}
582