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TOMOYO Linux Cross Reference
Linux/tools/perf/util/map.c

Version: ~ [ linux-5.15-rc3 ] ~ [ linux-5.14.8 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.69 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.149 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.208 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.248 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.284 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.285 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #include "symbol.h"
  2 #include <errno.h>
  3 #include <inttypes.h>
  4 #include <limits.h>
  5 #include <stdlib.h>
  6 #include <string.h>
  7 #include <stdio.h>
  8 #include <unistd.h>
  9 #include "map.h"
 10 #include "thread.h"
 11 #include "strlist.h"
 12 #include "vdso.h"
 13 #include "build-id.h"
 14 #include "util.h"
 15 #include "debug.h"
 16 #include "machine.h"
 17 #include <linux/string.h>
 18 #include "unwind.h"
 19 
 20 static void __maps__insert(struct maps *maps, struct map *map);
 21 
 22 const char *map_type__name[MAP__NR_TYPES] = {
 23         [MAP__FUNCTION] = "Functions",
 24         [MAP__VARIABLE] = "Variables",
 25 };
 26 
 27 static inline int is_anon_memory(const char *filename)
 28 {
 29         return !strcmp(filename, "//anon") ||
 30                !strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) ||
 31                !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1);
 32 }
 33 
 34 static inline int is_no_dso_memory(const char *filename)
 35 {
 36         return !strncmp(filename, "[stack", 6) ||
 37                !strncmp(filename, "/SYSV",5)   ||
 38                !strcmp(filename, "[heap]");
 39 }
 40 
 41 static inline int is_android_lib(const char *filename)
 42 {
 43         return !strncmp(filename, "/data/app-lib", 13) ||
 44                !strncmp(filename, "/system/lib", 11);
 45 }
 46 
 47 static inline bool replace_android_lib(const char *filename, char *newfilename)
 48 {
 49         const char *libname;
 50         char *app_abi;
 51         size_t app_abi_length, new_length;
 52         size_t lib_length = 0;
 53 
 54         libname  = strrchr(filename, '/');
 55         if (libname)
 56                 lib_length = strlen(libname);
 57 
 58         app_abi = getenv("APP_ABI");
 59         if (!app_abi)
 60                 return false;
 61 
 62         app_abi_length = strlen(app_abi);
 63 
 64         if (!strncmp(filename, "/data/app-lib", 13)) {
 65                 char *apk_path;
 66 
 67                 if (!app_abi_length)
 68                         return false;
 69 
 70                 new_length = 7 + app_abi_length + lib_length;
 71 
 72                 apk_path = getenv("APK_PATH");
 73                 if (apk_path) {
 74                         new_length += strlen(apk_path) + 1;
 75                         if (new_length > PATH_MAX)
 76                                 return false;
 77                         snprintf(newfilename, new_length,
 78                                  "%s/libs/%s/%s", apk_path, app_abi, libname);
 79                 } else {
 80                         if (new_length > PATH_MAX)
 81                                 return false;
 82                         snprintf(newfilename, new_length,
 83                                  "libs/%s/%s", app_abi, libname);
 84                 }
 85                 return true;
 86         }
 87 
 88         if (!strncmp(filename, "/system/lib/", 11)) {
 89                 char *ndk, *app;
 90                 const char *arch;
 91                 size_t ndk_length;
 92                 size_t app_length;
 93 
 94                 ndk = getenv("NDK_ROOT");
 95                 app = getenv("APP_PLATFORM");
 96 
 97                 if (!(ndk && app))
 98                         return false;
 99 
100                 ndk_length = strlen(ndk);
101                 app_length = strlen(app);
102 
103                 if (!(ndk_length && app_length && app_abi_length))
104                         return false;
105 
106                 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
107                        !strncmp(app_abi, "mips", 4) ? "mips" :
108                        !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
109 
110                 if (!arch)
111                         return false;
112 
113                 new_length = 27 + ndk_length +
114                              app_length + lib_length
115                            + strlen(arch);
116 
117                 if (new_length > PATH_MAX)
118                         return false;
119                 snprintf(newfilename, new_length,
120                         "%s/platforms/%s/arch-%s/usr/lib/%s",
121                         ndk, app, arch, libname);
122 
123                 return true;
124         }
125         return false;
126 }
127 
128 void map__init(struct map *map, enum map_type type,
129                u64 start, u64 end, u64 pgoff, struct dso *dso)
130 {
131         map->type     = type;
132         map->start    = start;
133         map->end      = end;
134         map->pgoff    = pgoff;
135         map->reloc    = 0;
136         map->dso      = dso__get(dso);
137         map->map_ip   = map__map_ip;
138         map->unmap_ip = map__unmap_ip;
139         RB_CLEAR_NODE(&map->rb_node);
140         map->groups   = NULL;
141         map->erange_warned = false;
142         atomic_set(&map->refcnt, 1);
143 }
144 
145 struct map *map__new(struct machine *machine, u64 start, u64 len,
146                      u64 pgoff, u32 pid, u32 d_maj, u32 d_min, u64 ino,
147                      u64 ino_gen, u32 prot, u32 flags, char *filename,
148                      enum map_type type, struct thread *thread)
149 {
150         struct map *map = malloc(sizeof(*map));
151 
152         if (map != NULL) {
153                 char newfilename[PATH_MAX];
154                 struct dso *dso;
155                 int anon, no_dso, vdso, android;
156 
157                 android = is_android_lib(filename);
158                 anon = is_anon_memory(filename);
159                 vdso = is_vdso_map(filename);
160                 no_dso = is_no_dso_memory(filename);
161 
162                 map->maj = d_maj;
163                 map->min = d_min;
164                 map->ino = ino;
165                 map->ino_generation = ino_gen;
166                 map->prot = prot;
167                 map->flags = flags;
168 
169                 if ((anon || no_dso) && type == MAP__FUNCTION) {
170                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid);
171                         filename = newfilename;
172                 }
173 
174                 if (android) {
175                         if (replace_android_lib(filename, newfilename))
176                                 filename = newfilename;
177                 }
178 
179                 if (vdso) {
180                         pgoff = 0;
181                         dso = machine__findnew_vdso(machine, thread);
182                 } else
183                         dso = machine__findnew_dso(machine, filename);
184 
185                 if (dso == NULL)
186                         goto out_delete;
187 
188                 map__init(map, type, start, start + len, pgoff, dso);
189 
190                 if (anon || no_dso) {
191                         map->map_ip = map->unmap_ip = identity__map_ip;
192 
193                         /*
194                          * Set memory without DSO as loaded. All map__find_*
195                          * functions still return NULL, and we avoid the
196                          * unnecessary map__load warning.
197                          */
198                         if (type != MAP__FUNCTION)
199                                 dso__set_loaded(dso, map->type);
200                 }
201                 dso__put(dso);
202         }
203         return map;
204 out_delete:
205         free(map);
206         return NULL;
207 }
208 
209 /*
210  * Constructor variant for modules (where we know from /proc/modules where
211  * they are loaded) and for vmlinux, where only after we load all the
212  * symbols we'll know where it starts and ends.
213  */
214 struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
215 {
216         struct map *map = calloc(1, (sizeof(*map) +
217                                      (dso->kernel ? sizeof(struct kmap) : 0)));
218         if (map != NULL) {
219                 /*
220                  * ->end will be filled after we load all the symbols
221                  */
222                 map__init(map, type, start, 0, 0, dso);
223         }
224 
225         return map;
226 }
227 
228 /*
229  * Use this and __map__is_kmodule() for map instances that are in
230  * machine->kmaps, and thus have map->groups->machine all properly set, to
231  * disambiguate between the kernel and modules.
232  *
233  * When the need arises, introduce map__is_{kernel,kmodule)() that
234  * checks (map->groups != NULL && map->groups->machine != NULL &&
235  * map->dso->kernel) before calling __map__is_{kernel,kmodule}())
236  */
237 bool __map__is_kernel(const struct map *map)
238 {
239         return __machine__kernel_map(map->groups->machine, map->type) == map;
240 }
241 
242 static void map__exit(struct map *map)
243 {
244         BUG_ON(!RB_EMPTY_NODE(&map->rb_node));
245         dso__zput(map->dso);
246 }
247 
248 void map__delete(struct map *map)
249 {
250         map__exit(map);
251         free(map);
252 }
253 
254 void map__put(struct map *map)
255 {
256         if (map && atomic_dec_and_test(&map->refcnt))
257                 map__delete(map);
258 }
259 
260 void map__fixup_start(struct map *map)
261 {
262         struct rb_root *symbols = &map->dso->symbols[map->type];
263         struct rb_node *nd = rb_first(symbols);
264         if (nd != NULL) {
265                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
266                 map->start = sym->start;
267         }
268 }
269 
270 void map__fixup_end(struct map *map)
271 {
272         struct rb_root *symbols = &map->dso->symbols[map->type];
273         struct rb_node *nd = rb_last(symbols);
274         if (nd != NULL) {
275                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
276                 map->end = sym->end;
277         }
278 }
279 
280 #define DSO__DELETED "(deleted)"
281 
282 int map__load(struct map *map, symbol_filter_t filter)
283 {
284         const char *name = map->dso->long_name;
285         int nr;
286 
287         if (dso__loaded(map->dso, map->type))
288                 return 0;
289 
290         nr = dso__load(map->dso, map, filter);
291         if (nr < 0) {
292                 if (map->dso->has_build_id) {
293                         char sbuild_id[SBUILD_ID_SIZE];
294 
295                         build_id__sprintf(map->dso->build_id,
296                                           sizeof(map->dso->build_id),
297                                           sbuild_id);
298                         pr_warning("%s with build id %s not found",
299                                    name, sbuild_id);
300                 } else
301                         pr_warning("Failed to open %s", name);
302 
303                 pr_warning(", continuing without symbols\n");
304                 return -1;
305         } else if (nr == 0) {
306 #ifdef HAVE_LIBELF_SUPPORT
307                 const size_t len = strlen(name);
308                 const size_t real_len = len - sizeof(DSO__DELETED);
309 
310                 if (len > sizeof(DSO__DELETED) &&
311                     strcmp(name + real_len + 1, DSO__DELETED) == 0) {
312                         pr_warning("%.*s was updated (is prelink enabled?). "
313                                 "Restart the long running apps that use it!\n",
314                                    (int)real_len, name);
315                 } else if (filter) {
316                         pr_warning("no symbols passed the given filter.\n");
317                         return -2;      /* Empty but maybe by the filter */
318                 } else {
319                         pr_warning("no symbols found in %s, maybe install "
320                                    "a debug package?\n", name);
321                 }
322 #endif
323                 return -1;
324         }
325 
326         return 0;
327 }
328 
329 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
330 {
331         return strcmp(namea, nameb);
332 }
333 
334 struct symbol *map__find_symbol(struct map *map, u64 addr,
335                                 symbol_filter_t filter)
336 {
337         if (map__load(map, filter) < 0)
338                 return NULL;
339 
340         return dso__find_symbol(map->dso, map->type, addr);
341 }
342 
343 struct symbol *map__find_symbol_by_name(struct map *map, const char *name,
344                                         symbol_filter_t filter)
345 {
346         if (map__load(map, filter) < 0)
347                 return NULL;
348 
349         if (!dso__sorted_by_name(map->dso, map->type))
350                 dso__sort_by_name(map->dso, map->type);
351 
352         return dso__find_symbol_by_name(map->dso, map->type, name);
353 }
354 
355 struct map *map__clone(struct map *from)
356 {
357         struct map *map = memdup(from, sizeof(*map));
358 
359         if (map != NULL) {
360                 atomic_set(&map->refcnt, 1);
361                 RB_CLEAR_NODE(&map->rb_node);
362                 dso__get(map->dso);
363                 map->groups = NULL;
364         }
365 
366         return map;
367 }
368 
369 int map__overlap(struct map *l, struct map *r)
370 {
371         if (l->start > r->start) {
372                 struct map *t = l;
373                 l = r;
374                 r = t;
375         }
376 
377         if (l->end > r->start)
378                 return 1;
379 
380         return 0;
381 }
382 
383 size_t map__fprintf(struct map *map, FILE *fp)
384 {
385         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
386                        map->start, map->end, map->pgoff, map->dso->name);
387 }
388 
389 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
390 {
391         const char *dsoname = "[unknown]";
392 
393         if (map && map->dso && (map->dso->name || map->dso->long_name)) {
394                 if (symbol_conf.show_kernel_path && map->dso->long_name)
395                         dsoname = map->dso->long_name;
396                 else if (map->dso->name)
397                         dsoname = map->dso->name;
398         }
399 
400         return fprintf(fp, "%s", dsoname);
401 }
402 
403 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
404                          FILE *fp)
405 {
406         char *srcline;
407         int ret = 0;
408 
409         if (map && map->dso) {
410                 srcline = get_srcline(map->dso,
411                                       map__rip_2objdump(map, addr), NULL, true);
412                 if (srcline != SRCLINE_UNKNOWN)
413                         ret = fprintf(fp, "%s%s", prefix, srcline);
414                 free_srcline(srcline);
415         }
416         return ret;
417 }
418 
419 /**
420  * map__rip_2objdump - convert symbol start address to objdump address.
421  * @map: memory map
422  * @rip: symbol start address
423  *
424  * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
425  * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
426  * relative to section start.
427  *
428  * Return: Address suitable for passing to "objdump --start-address="
429  */
430 u64 map__rip_2objdump(struct map *map, u64 rip)
431 {
432         if (!map->dso->adjust_symbols)
433                 return rip;
434 
435         if (map->dso->rel)
436                 return rip - map->pgoff;
437 
438         /*
439          * kernel modules also have DSO_TYPE_USER in dso->kernel,
440          * but all kernel modules are ET_REL, so won't get here.
441          */
442         if (map->dso->kernel == DSO_TYPE_USER)
443                 return rip + map->dso->text_offset;
444 
445         return map->unmap_ip(map, rip) - map->reloc;
446 }
447 
448 /**
449  * map__objdump_2mem - convert objdump address to a memory address.
450  * @map: memory map
451  * @ip: objdump address
452  *
453  * Closely related to map__rip_2objdump(), this function takes an address from
454  * objdump and converts it to a memory address.  Note this assumes that @map
455  * contains the address.  To be sure the result is valid, check it forwards
456  * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
457  *
458  * Return: Memory address.
459  */
460 u64 map__objdump_2mem(struct map *map, u64 ip)
461 {
462         if (!map->dso->adjust_symbols)
463                 return map->unmap_ip(map, ip);
464 
465         if (map->dso->rel)
466                 return map->unmap_ip(map, ip + map->pgoff);
467 
468         /*
469          * kernel modules also have DSO_TYPE_USER in dso->kernel,
470          * but all kernel modules are ET_REL, so won't get here.
471          */
472         if (map->dso->kernel == DSO_TYPE_USER)
473                 return map->unmap_ip(map, ip - map->dso->text_offset);
474 
475         return ip + map->reloc;
476 }
477 
478 static void maps__init(struct maps *maps)
479 {
480         maps->entries = RB_ROOT;
481         pthread_rwlock_init(&maps->lock, NULL);
482 }
483 
484 void map_groups__init(struct map_groups *mg, struct machine *machine)
485 {
486         int i;
487         for (i = 0; i < MAP__NR_TYPES; ++i) {
488                 maps__init(&mg->maps[i]);
489         }
490         mg->machine = machine;
491         atomic_set(&mg->refcnt, 1);
492 }
493 
494 static void __maps__purge(struct maps *maps)
495 {
496         struct rb_root *root = &maps->entries;
497         struct rb_node *next = rb_first(root);
498 
499         while (next) {
500                 struct map *pos = rb_entry(next, struct map, rb_node);
501 
502                 next = rb_next(&pos->rb_node);
503                 rb_erase_init(&pos->rb_node, root);
504                 map__put(pos);
505         }
506 }
507 
508 static void maps__exit(struct maps *maps)
509 {
510         pthread_rwlock_wrlock(&maps->lock);
511         __maps__purge(maps);
512         pthread_rwlock_unlock(&maps->lock);
513 }
514 
515 void map_groups__exit(struct map_groups *mg)
516 {
517         int i;
518 
519         for (i = 0; i < MAP__NR_TYPES; ++i)
520                 maps__exit(&mg->maps[i]);
521 }
522 
523 bool map_groups__empty(struct map_groups *mg)
524 {
525         int i;
526 
527         for (i = 0; i < MAP__NR_TYPES; ++i) {
528                 if (maps__first(&mg->maps[i]))
529                         return false;
530         }
531 
532         return true;
533 }
534 
535 struct map_groups *map_groups__new(struct machine *machine)
536 {
537         struct map_groups *mg = malloc(sizeof(*mg));
538 
539         if (mg != NULL)
540                 map_groups__init(mg, machine);
541 
542         return mg;
543 }
544 
545 void map_groups__delete(struct map_groups *mg)
546 {
547         map_groups__exit(mg);
548         free(mg);
549 }
550 
551 void map_groups__put(struct map_groups *mg)
552 {
553         if (mg && atomic_dec_and_test(&mg->refcnt))
554                 map_groups__delete(mg);
555 }
556 
557 struct symbol *map_groups__find_symbol(struct map_groups *mg,
558                                        enum map_type type, u64 addr,
559                                        struct map **mapp,
560                                        symbol_filter_t filter)
561 {
562         struct map *map = map_groups__find(mg, type, addr);
563 
564         /* Ensure map is loaded before using map->map_ip */
565         if (map != NULL && map__load(map, filter) >= 0) {
566                 if (mapp != NULL)
567                         *mapp = map;
568                 return map__find_symbol(map, map->map_ip(map, addr), filter);
569         }
570 
571         return NULL;
572 }
573 
574 struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
575                                          struct map **mapp, symbol_filter_t filter)
576 {
577         struct symbol *sym;
578         struct rb_node *nd;
579 
580         pthread_rwlock_rdlock(&maps->lock);
581 
582         for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
583                 struct map *pos = rb_entry(nd, struct map, rb_node);
584 
585                 sym = map__find_symbol_by_name(pos, name, filter);
586 
587                 if (sym == NULL)
588                         continue;
589                 if (mapp != NULL)
590                         *mapp = pos;
591                 goto out;
592         }
593 
594         sym = NULL;
595 out:
596         pthread_rwlock_unlock(&maps->lock);
597         return sym;
598 }
599 
600 struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
601                                                enum map_type type,
602                                                const char *name,
603                                                struct map **mapp,
604                                                symbol_filter_t filter)
605 {
606         struct symbol *sym = maps__find_symbol_by_name(&mg->maps[type], name, mapp, filter);
607 
608         return sym;
609 }
610 
611 int map_groups__find_ams(struct addr_map_symbol *ams, symbol_filter_t filter)
612 {
613         if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {
614                 if (ams->map->groups == NULL)
615                         return -1;
616                 ams->map = map_groups__find(ams->map->groups, ams->map->type,
617                                             ams->addr);
618                 if (ams->map == NULL)
619                         return -1;
620         }
621 
622         ams->al_addr = ams->map->map_ip(ams->map, ams->addr);
623         ams->sym = map__find_symbol(ams->map, ams->al_addr, filter);
624 
625         return ams->sym ? 0 : -1;
626 }
627 
628 static size_t maps__fprintf(struct maps *maps, FILE *fp)
629 {
630         size_t printed = 0;
631         struct rb_node *nd;
632 
633         pthread_rwlock_rdlock(&maps->lock);
634 
635         for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
636                 struct map *pos = rb_entry(nd, struct map, rb_node);
637                 printed += fprintf(fp, "Map:");
638                 printed += map__fprintf(pos, fp);
639                 if (verbose > 2) {
640                         printed += dso__fprintf(pos->dso, pos->type, fp);
641                         printed += fprintf(fp, "--\n");
642                 }
643         }
644 
645         pthread_rwlock_unlock(&maps->lock);
646 
647         return printed;
648 }
649 
650 size_t __map_groups__fprintf_maps(struct map_groups *mg, enum map_type type,
651                                   FILE *fp)
652 {
653         size_t printed = fprintf(fp, "%s:\n", map_type__name[type]);
654         return printed += maps__fprintf(&mg->maps[type], fp);
655 }
656 
657 size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
658 {
659         size_t printed = 0, i;
660         for (i = 0; i < MAP__NR_TYPES; ++i)
661                 printed += __map_groups__fprintf_maps(mg, i, fp);
662         return printed;
663 }
664 
665 static void __map_groups__insert(struct map_groups *mg, struct map *map)
666 {
667         __maps__insert(&mg->maps[map->type], map);
668         map->groups = mg;
669 }
670 
671 static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
672 {
673         struct rb_root *root;
674         struct rb_node *next;
675         int err = 0;
676 
677         pthread_rwlock_wrlock(&maps->lock);
678 
679         root = &maps->entries;
680         next = rb_first(root);
681 
682         while (next) {
683                 struct map *pos = rb_entry(next, struct map, rb_node);
684                 next = rb_next(&pos->rb_node);
685 
686                 if (!map__overlap(pos, map))
687                         continue;
688 
689                 if (verbose >= 2) {
690                         fputs("overlapping maps:\n", fp);
691                         map__fprintf(map, fp);
692                         map__fprintf(pos, fp);
693                 }
694 
695                 rb_erase_init(&pos->rb_node, root);
696                 /*
697                  * Now check if we need to create new maps for areas not
698                  * overlapped by the new map:
699                  */
700                 if (map->start > pos->start) {
701                         struct map *before = map__clone(pos);
702 
703                         if (before == NULL) {
704                                 err = -ENOMEM;
705                                 goto put_map;
706                         }
707 
708                         before->end = map->start;
709                         __map_groups__insert(pos->groups, before);
710                         if (verbose >= 2)
711                                 map__fprintf(before, fp);
712                         map__put(before);
713                 }
714 
715                 if (map->end < pos->end) {
716                         struct map *after = map__clone(pos);
717 
718                         if (after == NULL) {
719                                 err = -ENOMEM;
720                                 goto put_map;
721                         }
722 
723                         after->start = map->end;
724                         __map_groups__insert(pos->groups, after);
725                         if (verbose >= 2)
726                                 map__fprintf(after, fp);
727                         map__put(after);
728                 }
729 put_map:
730                 map__put(pos);
731 
732                 if (err)
733                         goto out;
734         }
735 
736         err = 0;
737 out:
738         pthread_rwlock_unlock(&maps->lock);
739         return err;
740 }
741 
742 int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
743                                    FILE *fp)
744 {
745         return maps__fixup_overlappings(&mg->maps[map->type], map, fp);
746 }
747 
748 /*
749  * XXX This should not really _copy_ te maps, but refcount them.
750  */
751 int map_groups__clone(struct thread *thread,
752                       struct map_groups *parent, enum map_type type)
753 {
754         struct map_groups *mg = thread->mg;
755         int err = -ENOMEM;
756         struct map *map;
757         struct maps *maps = &parent->maps[type];
758 
759         pthread_rwlock_rdlock(&maps->lock);
760 
761         for (map = maps__first(maps); map; map = map__next(map)) {
762                 struct map *new = map__clone(map);
763                 if (new == NULL)
764                         goto out_unlock;
765 
766                 err = unwind__prepare_access(thread, new, NULL);
767                 if (err)
768                         goto out_unlock;
769 
770                 map_groups__insert(mg, new);
771                 map__put(new);
772         }
773 
774         err = 0;
775 out_unlock:
776         pthread_rwlock_unlock(&maps->lock);
777         return err;
778 }
779 
780 static void __maps__insert(struct maps *maps, struct map *map)
781 {
782         struct rb_node **p = &maps->entries.rb_node;
783         struct rb_node *parent = NULL;
784         const u64 ip = map->start;
785         struct map *m;
786 
787         while (*p != NULL) {
788                 parent = *p;
789                 m = rb_entry(parent, struct map, rb_node);
790                 if (ip < m->start)
791                         p = &(*p)->rb_left;
792                 else
793                         p = &(*p)->rb_right;
794         }
795 
796         rb_link_node(&map->rb_node, parent, p);
797         rb_insert_color(&map->rb_node, &maps->entries);
798         map__get(map);
799 }
800 
801 void maps__insert(struct maps *maps, struct map *map)
802 {
803         pthread_rwlock_wrlock(&maps->lock);
804         __maps__insert(maps, map);
805         pthread_rwlock_unlock(&maps->lock);
806 }
807 
808 static void __maps__remove(struct maps *maps, struct map *map)
809 {
810         rb_erase_init(&map->rb_node, &maps->entries);
811         map__put(map);
812 }
813 
814 void maps__remove(struct maps *maps, struct map *map)
815 {
816         pthread_rwlock_wrlock(&maps->lock);
817         __maps__remove(maps, map);
818         pthread_rwlock_unlock(&maps->lock);
819 }
820 
821 struct map *maps__find(struct maps *maps, u64 ip)
822 {
823         struct rb_node **p, *parent = NULL;
824         struct map *m;
825 
826         pthread_rwlock_rdlock(&maps->lock);
827 
828         p = &maps->entries.rb_node;
829         while (*p != NULL) {
830                 parent = *p;
831                 m = rb_entry(parent, struct map, rb_node);
832                 if (ip < m->start)
833                         p = &(*p)->rb_left;
834                 else if (ip >= m->end)
835                         p = &(*p)->rb_right;
836                 else
837                         goto out;
838         }
839 
840         m = NULL;
841 out:
842         pthread_rwlock_unlock(&maps->lock);
843         return m;
844 }
845 
846 struct map *maps__first(struct maps *maps)
847 {
848         struct rb_node *first = rb_first(&maps->entries);
849 
850         if (first)
851                 return rb_entry(first, struct map, rb_node);
852         return NULL;
853 }
854 
855 struct map *map__next(struct map *map)
856 {
857         struct rb_node *next = rb_next(&map->rb_node);
858 
859         if (next)
860                 return rb_entry(next, struct map, rb_node);
861         return NULL;
862 }
863 
864 struct kmap *map__kmap(struct map *map)
865 {
866         if (!map->dso || !map->dso->kernel) {
867                 pr_err("Internal error: map__kmap with a non-kernel map\n");
868                 return NULL;
869         }
870         return (struct kmap *)(map + 1);
871 }
872 
873 struct map_groups *map__kmaps(struct map *map)
874 {
875         struct kmap *kmap = map__kmap(map);
876 
877         if (!kmap || !kmap->kmaps) {
878                 pr_err("Internal error: map__kmaps with a non-kernel map\n");
879                 return NULL;
880         }
881         return kmap->kmaps;
882 }
883 

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