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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/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
33/* Since GCC 12.1 sizes are in BYTES and not in WORDS (4B). */
34#if (__GNUC__ >= 12)
35#define GCOV_UNIT_SIZE 4
36#else
37#define GCOV_UNIT_SIZE 1
38#endif
39
40static struct gcov_info *gcov_info_head;
41
42/**
43 * struct gcov_ctr_info - information about counters for a single function
44 * @num: number of counter values for this type
45 * @values: array of counter values for this type
46 *
47 * This data is generated by gcc during compilation and doesn't change
48 * at run-time with the exception of the values array.
49 */
50struct gcov_ctr_info {
51 unsigned int num;
52 gcov_type *values;
53};
54
55/**
56 * struct gcov_fn_info - profiling meta data per function
57 * @key: comdat key
58 * @ident: unique ident of function
59 * @lineno_checksum: function lineo_checksum
60 * @cfg_checksum: function cfg checksum
61 * @ctrs: instrumented counters
62 *
63 * This data is generated by gcc during compilation and doesn't change
64 * at run-time.
65 *
66 * Information about a single function. This uses the trailing array
67 * idiom. The number of counters is determined from the merge pointer
68 * array in gcov_info. The key is used to detect which of a set of
69 * comdat functions was selected -- it points to the gcov_info object
70 * of the object file containing the selected comdat function.
71 */
72struct gcov_fn_info {
73 const struct gcov_info *key;
74 unsigned int ident;
75 unsigned int lineno_checksum;
76 unsigned int cfg_checksum;
77 struct gcov_ctr_info ctrs[];
78};
79
80/**
81 * struct gcov_info - profiling data per object file
82 * @version: gcov version magic indicating the gcc version used for compilation
83 * @next: list head for a singly-linked list
84 * @stamp: uniquifying time stamp
85 * @checksum: unique object checksum
86 * @filename: name of the associated gcov data file
87 * @merge: merge functions (null for unused counter type)
88 * @n_functions: number of instrumented functions
89 * @functions: pointer to pointers to function information
90 *
91 * This data is generated by gcc during compilation and doesn't change
92 * at run-time with the exception of the next pointer.
93 */
94struct gcov_info {
95 unsigned int version;
96 struct gcov_info *next;
97 unsigned int stamp;
98 /* Since GCC 12.1 a checksum field is added. */
99#if (__GNUC__ >= 12)
100 unsigned int checksum;
101#endif
102 const char *filename;
103 void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
104 unsigned int n_functions;
105 struct gcov_fn_info **functions;
106};
107
108/**
109 * gcov_info_filename - return info filename
110 * @info: profiling data set
111 */
112const char *gcov_info_filename(struct gcov_info *info)
113{
114 return info->filename;
115}
116
117/**
118 * gcov_info_version - return info version
119 * @info: profiling data set
120 */
121unsigned int gcov_info_version(struct gcov_info *info)
122{
123 return info->version;
124}
125
126/**
127 * gcov_info_next - return next profiling data set
128 * @info: profiling data set
129 *
130 * Returns next gcov_info following @info or first gcov_info in the chain if
131 * @info is %NULL.
132 */
133struct gcov_info *gcov_info_next(struct gcov_info *info)
134{
135 if (!info)
136 return gcov_info_head;
137
138 return info->next;
139}
140
141/**
142 * gcov_info_link - link/add profiling data set to the list
143 * @info: profiling data set
144 */
145void gcov_info_link(struct gcov_info *info)
146{
147 info->next = gcov_info_head;
148 gcov_info_head = info;
149}
150
151/**
152 * gcov_info_unlink - unlink/remove profiling data set from the list
153 * @prev: previous profiling data set
154 * @info: profiling data set
155 */
156void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
157{
158 if (prev)
159 prev->next = info->next;
160 else
161 gcov_info_head = info->next;
162}
163
164/**
165 * gcov_info_within_module - check if a profiling data set belongs to a module
166 * @info: profiling data set
167 * @mod: module
168 *
169 * Returns true if profiling data belongs module, false otherwise.
170 */
171bool gcov_info_within_module(struct gcov_info *info, struct module *mod)
172{
173 return within_module((unsigned long)info, mod);
174}
175
176/* Symbolic links to be created for each profiling data file. */
177const struct gcov_link gcov_link[] = {
178 { OBJ_TREE, "gcno" }, /* Link to .gcno file in $(objtree). */
179 { 0, NULL},
180};
181
182/*
183 * Determine whether a counter is active. Doesn't change at run-time.
184 */
185static int counter_active(struct gcov_info *info, unsigned int type)
186{
187 return info->merge[type] ? 1 : 0;
188}
189
190/* Determine number of active counters. Based on gcc magic. */
191static unsigned int num_counter_active(struct gcov_info *info)
192{
193 unsigned int i;
194 unsigned int result = 0;
195
196 for (i = 0; i < GCOV_COUNTERS; i++) {
197 if (counter_active(info, i))
198 result++;
199 }
200 return result;
201}
202
203/**
204 * gcov_info_reset - reset profiling data to zero
205 * @info: profiling data set
206 */
207void gcov_info_reset(struct gcov_info *info)
208{
209 struct gcov_ctr_info *ci_ptr;
210 unsigned int fi_idx;
211 unsigned int ct_idx;
212
213 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
214 ci_ptr = info->functions[fi_idx]->ctrs;
215
216 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
217 if (!counter_active(info, ct_idx))
218 continue;
219
220 memset(ci_ptr->values, 0,
221 sizeof(gcov_type) * ci_ptr->num);
222 ci_ptr++;
223 }
224 }
225}
226
227/**
228 * gcov_info_is_compatible - check if profiling data can be added
229 * @info1: first profiling data set
230 * @info2: second profiling data set
231 *
232 * Returns non-zero if profiling data can be added, zero otherwise.
233 */
234int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
235{
236 return (info1->stamp == info2->stamp);
237}
238
239/**
240 * gcov_info_add - add up profiling data
241 * @dst: profiling data set to which data is added
242 * @src: profiling data set which is added
243 *
244 * Adds profiling counts of @src to @dst.
245 */
246void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
247{
248 struct gcov_ctr_info *dci_ptr;
249 struct gcov_ctr_info *sci_ptr;
250 unsigned int fi_idx;
251 unsigned int ct_idx;
252 unsigned int val_idx;
253
254 for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {
255 dci_ptr = dst->functions[fi_idx]->ctrs;
256 sci_ptr = src->functions[fi_idx]->ctrs;
257
258 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
259 if (!counter_active(src, ct_idx))
260 continue;
261
262 for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)
263 dci_ptr->values[val_idx] +=
264 sci_ptr->values[val_idx];
265
266 dci_ptr++;
267 sci_ptr++;
268 }
269 }
270}
271
272/**
273 * gcov_info_dup - duplicate profiling data set
274 * @info: profiling data set to duplicate
275 *
276 * Return newly allocated duplicate on success, %NULL on error.
277 */
278struct gcov_info *gcov_info_dup(struct gcov_info *info)
279{
280 struct gcov_info *dup;
281 struct gcov_ctr_info *dci_ptr; /* dst counter info */
282 struct gcov_ctr_info *sci_ptr; /* src counter info */
283 unsigned int active;
284 unsigned int fi_idx; /* function info idx */
285 unsigned int ct_idx; /* counter type idx */
286 size_t fi_size; /* function info size */
287 size_t cv_size; /* counter values size */
288
289 dup = kmemdup(info, sizeof(*dup), GFP_KERNEL);
290 if (!dup)
291 return NULL;
292
293 dup->next = NULL;
294 dup->filename = NULL;
295 dup->functions = NULL;
296
297 dup->filename = kstrdup(info->filename, GFP_KERNEL);
298 if (!dup->filename)
299 goto err_free;
300
301 dup->functions = kcalloc(info->n_functions,
302 sizeof(struct gcov_fn_info *), GFP_KERNEL);
303 if (!dup->functions)
304 goto err_free;
305
306 active = num_counter_active(info);
307 fi_size = sizeof(struct gcov_fn_info);
308 fi_size += sizeof(struct gcov_ctr_info) * active;
309
310 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
311 dup->functions[fi_idx] = kzalloc(fi_size, GFP_KERNEL);
312 if (!dup->functions[fi_idx])
313 goto err_free;
314
315 *(dup->functions[fi_idx]) = *(info->functions[fi_idx]);
316
317 sci_ptr = info->functions[fi_idx]->ctrs;
318 dci_ptr = dup->functions[fi_idx]->ctrs;
319
320 for (ct_idx = 0; ct_idx < active; ct_idx++) {
321
322 cv_size = sizeof(gcov_type) * sci_ptr->num;
323
324 dci_ptr->values = kvmalloc(cv_size, GFP_KERNEL);
325
326 if (!dci_ptr->values)
327 goto err_free;
328
329 dci_ptr->num = sci_ptr->num;
330 memcpy(dci_ptr->values, sci_ptr->values, cv_size);
331
332 sci_ptr++;
333 dci_ptr++;
334 }
335 }
336
337 return dup;
338err_free:
339 gcov_info_free(dup);
340 return NULL;
341}
342
343/**
344 * gcov_info_free - release memory for profiling data set duplicate
345 * @info: profiling data set duplicate to free
346 */
347void gcov_info_free(struct gcov_info *info)
348{
349 unsigned int active;
350 unsigned int fi_idx;
351 unsigned int ct_idx;
352 struct gcov_ctr_info *ci_ptr;
353
354 if (!info->functions)
355 goto free_info;
356
357 active = num_counter_active(info);
358
359 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
360 if (!info->functions[fi_idx])
361 continue;
362
363 ci_ptr = info->functions[fi_idx]->ctrs;
364
365 for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)
366 kvfree(ci_ptr->values);
367
368 kfree(info->functions[fi_idx]);
369 }
370
371free_info:
372 kfree(info->functions);
373 kfree(info->filename);
374 kfree(info);
375}
376
377/**
378 * convert_to_gcda - convert profiling data set to gcda file format
379 * @buffer: the buffer to store file data or %NULL if no data should be stored
380 * @info: profiling data set to be converted
381 *
382 * Returns the number of bytes that were/would have been stored into the buffer.
383 */
384size_t convert_to_gcda(char *buffer, struct gcov_info *info)
385{
386 struct gcov_fn_info *fi_ptr;
387 struct gcov_ctr_info *ci_ptr;
388 unsigned int fi_idx;
389 unsigned int ct_idx;
390 unsigned int cv_idx;
391 size_t pos = 0;
392
393 /* File header. */
394 pos += store_gcov_u32(buffer, pos, GCOV_DATA_MAGIC);
395 pos += store_gcov_u32(buffer, pos, info->version);
396 pos += store_gcov_u32(buffer, pos, info->stamp);
397
398#if (__GNUC__ >= 12)
399 /* Use zero as checksum of the compilation unit. */
400 pos += store_gcov_u32(buffer, pos, 0);
401#endif
402
403 for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
404 fi_ptr = info->functions[fi_idx];
405
406 /* Function record. */
407 pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION);
408 pos += store_gcov_u32(buffer, pos,
409 GCOV_TAG_FUNCTION_LENGTH * GCOV_UNIT_SIZE);
410 pos += store_gcov_u32(buffer, pos, fi_ptr->ident);
411 pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum);
412 pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
413
414 ci_ptr = fi_ptr->ctrs;
415
416 for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
417 if (!counter_active(info, ct_idx))
418 continue;
419
420 /* Counter record. */
421 pos += store_gcov_u32(buffer, pos,
422 GCOV_TAG_FOR_COUNTER(ct_idx));
423 pos += store_gcov_u32(buffer, pos,
424 ci_ptr->num * 2 * GCOV_UNIT_SIZE);
425
426 for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {
427 pos += store_gcov_u64(buffer, pos,
428 ci_ptr->values[cv_idx]);
429 }
430
431 ci_ptr++;
432 }
433 }
434
435 return pos;
436}
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}