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

Version: ~ [ linux-5.15-rc1 ] ~ [ linux-5.14.5 ] ~ [ linux-5.13.18 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.66 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.147 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.206 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.246 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.282 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.283 ] ~ [ 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 <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
 10 #include "map.h"
 11 #include "thread.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 "srcline.h"
 19 #include "unwind.h"
 20 
 21 static void __maps__insert(struct maps *maps, struct map *map);
 22 
 23 const char *map_type__name[MAP__NR_TYPES] = {
 24         [MAP__FUNCTION] = "Functions",
 25         [MAP__VARIABLE] = "Variables",
 26 };
 27 
 28 static inline int is_anon_memory(const char *filename, u32 flags)
 29 {
 30         return flags & MAP_HUGETLB ||
 31                !strcmp(filename, "//anon") ||
 32                !strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) ||
 33                !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1);
 34 }
 35 
 36 static inline int is_no_dso_memory(const char *filename)
 37 {
 38         return !strncmp(filename, "[stack", 6) ||
 39                !strncmp(filename, "/SYSV",5)   ||
 40                !strcmp(filename, "[heap]");
 41 }
 42 
 43 static inline int is_android_lib(const char *filename)
 44 {
 45         return !strncmp(filename, "/data/app-lib", 13) ||
 46                !strncmp(filename, "/system/lib", 11);
 47 }
 48 
 49 static inline bool replace_android_lib(const char *filename, char *newfilename)
 50 {
 51         const char *libname;
 52         char *app_abi;
 53         size_t app_abi_length, new_length;
 54         size_t lib_length = 0;
 55 
 56         libname  = strrchr(filename, '/');
 57         if (libname)
 58                 lib_length = strlen(libname);
 59 
 60         app_abi = getenv("APP_ABI");
 61         if (!app_abi)
 62                 return false;
 63 
 64         app_abi_length = strlen(app_abi);
 65 
 66         if (!strncmp(filename, "/data/app-lib", 13)) {
 67                 char *apk_path;
 68 
 69                 if (!app_abi_length)
 70                         return false;
 71 
 72                 new_length = 7 + app_abi_length + lib_length;
 73 
 74                 apk_path = getenv("APK_PATH");
 75                 if (apk_path) {
 76                         new_length += strlen(apk_path) + 1;
 77                         if (new_length > PATH_MAX)
 78                                 return false;
 79                         snprintf(newfilename, new_length,
 80                                  "%s/libs/%s/%s", apk_path, app_abi, libname);
 81                 } else {
 82                         if (new_length > PATH_MAX)
 83                                 return false;
 84                         snprintf(newfilename, new_length,
 85                                  "libs/%s/%s", app_abi, libname);
 86                 }
 87                 return true;
 88         }
 89 
 90         if (!strncmp(filename, "/system/lib/", 11)) {
 91                 char *ndk, *app;
 92                 const char *arch;
 93                 size_t ndk_length;
 94                 size_t app_length;
 95 
 96                 ndk = getenv("NDK_ROOT");
 97                 app = getenv("APP_PLATFORM");
 98 
 99                 if (!(ndk && app))
100                         return false;
101 
102                 ndk_length = strlen(ndk);
103                 app_length = strlen(app);
104 
105                 if (!(ndk_length && app_length && app_abi_length))
106                         return false;
107 
108                 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
109                        !strncmp(app_abi, "mips", 4) ? "mips" :
110                        !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
111 
112                 if (!arch)
113                         return false;
114 
115                 new_length = 27 + ndk_length +
116                              app_length + lib_length
117                            + strlen(arch);
118 
119                 if (new_length > PATH_MAX)
120                         return false;
121                 snprintf(newfilename, new_length,
122                         "%s/platforms/%s/arch-%s/usr/lib/%s",
123                         ndk, app, arch, libname);
124 
125                 return true;
126         }
127         return false;
128 }
129 
130 void map__init(struct map *map, enum map_type type,
131                u64 start, u64 end, u64 pgoff, struct dso *dso)
132 {
133         map->type     = type;
134         map->start    = start;
135         map->end      = end;
136         map->pgoff    = pgoff;
137         map->reloc    = 0;
138         map->dso      = dso__get(dso);
139         map->map_ip   = map__map_ip;
140         map->unmap_ip = map__unmap_ip;
141         RB_CLEAR_NODE(&map->rb_node);
142         map->groups   = NULL;
143         map->erange_warned = false;
144         refcount_set(&map->refcnt, 1);
145 }
146 
147 struct map *map__new(struct machine *machine, u64 start, u64 len,
148                      u64 pgoff, u32 pid, u32 d_maj, u32 d_min, u64 ino,
149                      u64 ino_gen, u32 prot, u32 flags, char *filename,
150                      enum map_type type, struct thread *thread)
151 {
152         struct map *map = malloc(sizeof(*map));
153 
154         if (map != NULL) {
155                 char newfilename[PATH_MAX];
156                 struct dso *dso;
157                 int anon, no_dso, vdso, android;
158 
159                 android = is_android_lib(filename);
160                 anon = is_anon_memory(filename, flags);
161                 vdso = is_vdso_map(filename);
162                 no_dso = is_no_dso_memory(filename);
163 
164                 map->maj = d_maj;
165                 map->min = d_min;
166                 map->ino = ino;
167                 map->ino_generation = ino_gen;
168                 map->prot = prot;
169                 map->flags = flags;
170 
171                 if ((anon || no_dso) && type == MAP__FUNCTION) {
172                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid);
173                         filename = newfilename;
174                 }
175 
176                 if (android) {
177                         if (replace_android_lib(filename, newfilename))
178                                 filename = newfilename;
179                 }
180 
181                 if (vdso) {
182                         pgoff = 0;
183                         dso = machine__findnew_vdso(machine, thread);
184                 } else
185                         dso = machine__findnew_dso(machine, filename);
186 
187                 if (dso == NULL)
188                         goto out_delete;
189 
190                 map__init(map, type, start, start + len, pgoff, dso);
191 
192                 if (anon || no_dso) {
193                         map->map_ip = map->unmap_ip = identity__map_ip;
194 
195                         /*
196                          * Set memory without DSO as loaded. All map__find_*
197                          * functions still return NULL, and we avoid the
198                          * unnecessary map__load warning.
199                          */
200                         if (type != MAP__FUNCTION)
201                                 dso__set_loaded(dso, map->type);
202                 }
203                 dso__put(dso);
204         }
205         return map;
206 out_delete:
207         free(map);
208         return NULL;
209 }
210 
211 /*
212  * Constructor variant for modules (where we know from /proc/modules where
213  * they are loaded) and for vmlinux, where only after we load all the
214  * symbols we'll know where it starts and ends.
215  */
216 struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
217 {
218         struct map *map = calloc(1, (sizeof(*map) +
219                                      (dso->kernel ? sizeof(struct kmap) : 0)));
220         if (map != NULL) {
221                 /*
222                  * ->end will be filled after we load all the symbols
223                  */
224                 map__init(map, type, start, 0, 0, dso);
225         }
226 
227         return map;
228 }
229 
230 /*
231  * Use this and __map__is_kmodule() for map instances that are in
232  * machine->kmaps, and thus have map->groups->machine all properly set, to
233  * disambiguate between the kernel and modules.
234  *
235  * When the need arises, introduce map__is_{kernel,kmodule)() that
236  * checks (map->groups != NULL && map->groups->machine != NULL &&
237  * map->dso->kernel) before calling __map__is_{kernel,kmodule}())
238  */
239 bool __map__is_kernel(const struct map *map)
240 {
241         return __machine__kernel_map(map->groups->machine, map->type) == map;
242 }
243 
244 static void map__exit(struct map *map)
245 {
246         BUG_ON(!RB_EMPTY_NODE(&map->rb_node));
247         dso__zput(map->dso);
248 }
249 
250 void map__delete(struct map *map)
251 {
252         map__exit(map);
253         free(map);
254 }
255 
256 void map__put(struct map *map)
257 {
258         if (map && refcount_dec_and_test(&map->refcnt))
259                 map__delete(map);
260 }
261 
262 void map__fixup_start(struct map *map)
263 {
264         struct rb_root *symbols = &map->dso->symbols[map->type];
265         struct rb_node *nd = rb_first(symbols);
266         if (nd != NULL) {
267                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
268                 map->start = sym->start;
269         }
270 }
271 
272 void map__fixup_end(struct map *map)
273 {
274         struct rb_root *symbols = &map->dso->symbols[map->type];
275         struct rb_node *nd = rb_last(symbols);
276         if (nd != NULL) {
277                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
278                 map->end = sym->end;
279         }
280 }
281 
282 #define DSO__DELETED "(deleted)"
283 
284 int map__load(struct map *map)
285 {
286         const char *name = map->dso->long_name;
287         int nr;
288 
289         if (dso__loaded(map->dso, map->type))
290                 return 0;
291 
292         nr = dso__load(map->dso, map);
293         if (nr < 0) {
294                 if (map->dso->has_build_id) {
295                         char sbuild_id[SBUILD_ID_SIZE];
296 
297                         build_id__sprintf(map->dso->build_id,
298                                           sizeof(map->dso->build_id),
299                                           sbuild_id);
300                         pr_warning("%s with build id %s not found",
301                                    name, sbuild_id);
302                 } else
303                         pr_warning("Failed to open %s", name);
304 
305                 pr_warning(", continuing without symbols\n");
306                 return -1;
307         } else if (nr == 0) {
308 #ifdef HAVE_LIBELF_SUPPORT
309                 const size_t len = strlen(name);
310                 const size_t real_len = len - sizeof(DSO__DELETED);
311 
312                 if (len > sizeof(DSO__DELETED) &&
313                     strcmp(name + real_len + 1, DSO__DELETED) == 0) {
314                         pr_warning("%.*s was updated (is prelink enabled?). "
315                                 "Restart the long running apps that use it!\n",
316                                    (int)real_len, name);
317                 } else {
318                         pr_warning("no symbols found in %s, maybe install "
319                                    "a debug package?\n", name);
320                 }
321 #endif
322                 return -1;
323         }
324 
325         return 0;
326 }
327 
328 struct symbol *map__find_symbol(struct map *map, u64 addr)
329 {
330         if (map__load(map) < 0)
331                 return NULL;
332 
333         return dso__find_symbol(map->dso, map->type, addr);
334 }
335 
336 struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
337 {
338         if (map__load(map) < 0)
339                 return NULL;
340 
341         if (!dso__sorted_by_name(map->dso, map->type))
342                 dso__sort_by_name(map->dso, map->type);
343 
344         return dso__find_symbol_by_name(map->dso, map->type, name);
345 }
346 
347 struct map *map__clone(struct map *from)
348 {
349         struct map *map = memdup(from, sizeof(*map));
350 
351         if (map != NULL) {
352                 refcount_set(&map->refcnt, 1);
353                 RB_CLEAR_NODE(&map->rb_node);
354                 dso__get(map->dso);
355                 map->groups = NULL;
356         }
357 
358         return map;
359 }
360 
361 int map__overlap(struct map *l, struct map *r)
362 {
363         if (l->start > r->start) {
364                 struct map *t = l;
365                 l = r;
366                 r = t;
367         }
368 
369         if (l->end > r->start)
370                 return 1;
371 
372         return 0;
373 }
374 
375 size_t map__fprintf(struct map *map, FILE *fp)
376 {
377         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
378                        map->start, map->end, map->pgoff, map->dso->name);
379 }
380 
381 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
382 {
383         const char *dsoname = "[unknown]";
384 
385         if (map && map->dso) {
386                 if (symbol_conf.show_kernel_path && map->dso->long_name)
387                         dsoname = map->dso->long_name;
388                 else
389                         dsoname = map->dso->name;
390         }
391 
392         return fprintf(fp, "%s", dsoname);
393 }
394 
395 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
396                          FILE *fp)
397 {
398         char *srcline;
399         int ret = 0;
400 
401         if (map && map->dso) {
402                 srcline = get_srcline(map->dso,
403                                       map__rip_2objdump(map, addr), NULL,
404                                       true, true);
405                 if (srcline != SRCLINE_UNKNOWN)
406                         ret = fprintf(fp, "%s%s", prefix, srcline);
407                 free_srcline(srcline);
408         }
409         return ret;
410 }
411 
412 /**
413  * map__rip_2objdump - convert symbol start address to objdump address.
414  * @map: memory map
415  * @rip: symbol start address
416  *
417  * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
418  * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
419  * relative to section start.
420  *
421  * Return: Address suitable for passing to "objdump --start-address="
422  */
423 u64 map__rip_2objdump(struct map *map, u64 rip)
424 {
425         if (!map->dso->adjust_symbols)
426                 return rip;
427 
428         if (map->dso->rel)
429                 return rip - map->pgoff;
430 
431         /*
432          * kernel modules also have DSO_TYPE_USER in dso->kernel,
433          * but all kernel modules are ET_REL, so won't get here.
434          */
435         if (map->dso->kernel == DSO_TYPE_USER)
436                 return rip + map->dso->text_offset;
437 
438         return map->unmap_ip(map, rip) - map->reloc;
439 }
440 
441 /**
442  * map__objdump_2mem - convert objdump address to a memory address.
443  * @map: memory map
444  * @ip: objdump address
445  *
446  * Closely related to map__rip_2objdump(), this function takes an address from
447  * objdump and converts it to a memory address.  Note this assumes that @map
448  * contains the address.  To be sure the result is valid, check it forwards
449  * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
450  *
451  * Return: Memory address.
452  */
453 u64 map__objdump_2mem(struct map *map, u64 ip)
454 {
455         if (!map->dso->adjust_symbols)
456                 return map->unmap_ip(map, ip);
457 
458         if (map->dso->rel)
459                 return map->unmap_ip(map, ip + map->pgoff);
460 
461         /*
462          * kernel modules also have DSO_TYPE_USER in dso->kernel,
463          * but all kernel modules are ET_REL, so won't get here.
464          */
465         if (map->dso->kernel == DSO_TYPE_USER)
466                 return map->unmap_ip(map, ip - map->dso->text_offset);
467 
468         return ip + map->reloc;
469 }
470 
471 static void maps__init(struct maps *maps)
472 {
473         maps->entries = RB_ROOT;
474         pthread_rwlock_init(&maps->lock, NULL);
475 }
476 
477 void map_groups__init(struct map_groups *mg, struct machine *machine)
478 {
479         int i;
480         for (i = 0; i < MAP__NR_TYPES; ++i) {
481                 maps__init(&mg->maps[i]);
482         }
483         mg->machine = machine;
484         refcount_set(&mg->refcnt, 1);
485 }
486 
487 static void __maps__purge(struct maps *maps)
488 {
489         struct rb_root *root = &maps->entries;
490         struct rb_node *next = rb_first(root);
491 
492         while (next) {
493                 struct map *pos = rb_entry(next, struct map, rb_node);
494 
495                 next = rb_next(&pos->rb_node);
496                 rb_erase_init(&pos->rb_node, root);
497                 map__put(pos);
498         }
499 }
500 
501 static void maps__exit(struct maps *maps)
502 {
503         pthread_rwlock_wrlock(&maps->lock);
504         __maps__purge(maps);
505         pthread_rwlock_unlock(&maps->lock);
506 }
507 
508 void map_groups__exit(struct map_groups *mg)
509 {
510         int i;
511 
512         for (i = 0; i < MAP__NR_TYPES; ++i)
513                 maps__exit(&mg->maps[i]);
514 }
515 
516 bool map_groups__empty(struct map_groups *mg)
517 {
518         int i;
519 
520         for (i = 0; i < MAP__NR_TYPES; ++i) {
521                 if (maps__first(&mg->maps[i]))
522                         return false;
523         }
524 
525         return true;
526 }
527 
528 struct map_groups *map_groups__new(struct machine *machine)
529 {
530         struct map_groups *mg = malloc(sizeof(*mg));
531 
532         if (mg != NULL)
533                 map_groups__init(mg, machine);
534 
535         return mg;
536 }
537 
538 void map_groups__delete(struct map_groups *mg)
539 {
540         map_groups__exit(mg);
541         free(mg);
542 }
543 
544 void map_groups__put(struct map_groups *mg)
545 {
546         if (mg && refcount_dec_and_test(&mg->refcnt))
547                 map_groups__delete(mg);
548 }
549 
550 struct symbol *map_groups__find_symbol(struct map_groups *mg,
551                                        enum map_type type, u64 addr,
552                                        struct map **mapp)
553 {
554         struct map *map = map_groups__find(mg, type, addr);
555 
556         /* Ensure map is loaded before using map->map_ip */
557         if (map != NULL && map__load(map) >= 0) {
558                 if (mapp != NULL)
559                         *mapp = map;
560                 return map__find_symbol(map, map->map_ip(map, addr));
561         }
562 
563         return NULL;
564 }
565 
566 struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
567                                          struct map **mapp)
568 {
569         struct symbol *sym;
570         struct rb_node *nd;
571 
572         pthread_rwlock_rdlock(&maps->lock);
573 
574         for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
575                 struct map *pos = rb_entry(nd, struct map, rb_node);
576 
577                 sym = map__find_symbol_by_name(pos, name);
578 
579                 if (sym == NULL)
580                         continue;
581                 if (mapp != NULL)
582                         *mapp = pos;
583                 goto out;
584         }
585 
586         sym = NULL;
587 out:
588         pthread_rwlock_unlock(&maps->lock);
589         return sym;
590 }
591 
592 struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
593                                                enum map_type type,
594                                                const char *name,
595                                                struct map **mapp)
596 {
597         struct symbol *sym = maps__find_symbol_by_name(&mg->maps[type], name, mapp);
598 
599         return sym;
600 }
601 
602 int map_groups__find_ams(struct addr_map_symbol *ams)
603 {
604         if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {
605                 if (ams->map->groups == NULL)
606                         return -1;
607                 ams->map = map_groups__find(ams->map->groups, ams->map->type,
608                                             ams->addr);
609                 if (ams->map == NULL)
610                         return -1;
611         }
612 
613         ams->al_addr = ams->map->map_ip(ams->map, ams->addr);
614         ams->sym = map__find_symbol(ams->map, ams->al_addr);
615 
616         return ams->sym ? 0 : -1;
617 }
618 
619 static size_t maps__fprintf(struct maps *maps, FILE *fp)
620 {
621         size_t printed = 0;
622         struct rb_node *nd;
623 
624         pthread_rwlock_rdlock(&maps->lock);
625 
626         for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
627                 struct map *pos = rb_entry(nd, struct map, rb_node);
628                 printed += fprintf(fp, "Map:");
629                 printed += map__fprintf(pos, fp);
630                 if (verbose > 2) {
631                         printed += dso__fprintf(pos->dso, pos->type, fp);
632                         printed += fprintf(fp, "--\n");
633                 }
634         }
635 
636         pthread_rwlock_unlock(&maps->lock);
637 
638         return printed;
639 }
640 
641 size_t __map_groups__fprintf_maps(struct map_groups *mg, enum map_type type,
642                                   FILE *fp)
643 {
644         size_t printed = fprintf(fp, "%s:\n", map_type__name[type]);
645         return printed += maps__fprintf(&mg->maps[type], fp);
646 }
647 
648 size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
649 {
650         size_t printed = 0, i;
651         for (i = 0; i < MAP__NR_TYPES; ++i)
652                 printed += __map_groups__fprintf_maps(mg, i, fp);
653         return printed;
654 }
655 
656 static void __map_groups__insert(struct map_groups *mg, struct map *map)
657 {
658         __maps__insert(&mg->maps[map->type], map);
659         map->groups = mg;
660 }
661 
662 static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
663 {
664         struct rb_root *root;
665         struct rb_node *next;
666         int err = 0;
667 
668         pthread_rwlock_wrlock(&maps->lock);
669 
670         root = &maps->entries;
671         next = rb_first(root);
672 
673         while (next) {
674                 struct map *pos = rb_entry(next, struct map, rb_node);
675                 next = rb_next(&pos->rb_node);
676 
677                 if (!map__overlap(pos, map))
678                         continue;
679 
680                 if (verbose >= 2) {
681 
682                         if (use_browser) {
683                                 pr_warning("overlapping maps in %s "
684                                            "(disable tui for more info)\n",
685                                            map->dso->name);
686                         } else {
687                                 fputs("overlapping maps:\n", fp);
688                                 map__fprintf(map, fp);
689                                 map__fprintf(pos, fp);
690                         }
691                 }
692 
693                 rb_erase_init(&pos->rb_node, root);
694                 /*
695                  * Now check if we need to create new maps for areas not
696                  * overlapped by the new map:
697                  */
698                 if (map->start > pos->start) {
699                         struct map *before = map__clone(pos);
700 
701                         if (before == NULL) {
702                                 err = -ENOMEM;
703                                 goto put_map;
704                         }
705 
706                         before->end = map->start;
707                         __map_groups__insert(pos->groups, before);
708                         if (verbose >= 2 && !use_browser)
709                                 map__fprintf(before, fp);
710                         map__put(before);
711                 }
712 
713                 if (map->end < pos->end) {
714                         struct map *after = map__clone(pos);
715 
716                         if (after == NULL) {
717                                 err = -ENOMEM;
718                                 goto put_map;
719                         }
720 
721                         after->start = map->end;
722                         __map_groups__insert(pos->groups, after);
723                         if (verbose >= 2 && !use_browser)
724                                 map__fprintf(after, fp);
725                         map__put(after);
726                 }
727 put_map:
728                 map__put(pos);
729 
730                 if (err)
731                         goto out;
732         }
733 
734         err = 0;
735 out:
736         pthread_rwlock_unlock(&maps->lock);
737         return err;
738 }
739 
740 int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
741                                    FILE *fp)
742 {
743         return maps__fixup_overlappings(&mg->maps[map->type], map, fp);
744 }
745 
746 /*
747  * XXX This should not really _copy_ te maps, but refcount them.
748  */
749 int map_groups__clone(struct thread *thread,
750                       struct map_groups *parent, enum map_type type)
751 {
752         struct map_groups *mg = thread->mg;
753         int err = -ENOMEM;
754         struct map *map;
755         struct maps *maps = &parent->maps[type];
756 
757         pthread_rwlock_rdlock(&maps->lock);
758 
759         for (map = maps__first(maps); map; map = map__next(map)) {
760                 struct map *new = map__clone(map);
761                 if (new == NULL)
762                         goto out_unlock;
763 
764                 err = unwind__prepare_access(thread, new, NULL);
765                 if (err)
766                         goto out_unlock;
767 
768                 map_groups__insert(mg, new);
769                 map__put(new);
770         }
771 
772         err = 0;
773 out_unlock:
774         pthread_rwlock_unlock(&maps->lock);
775         return err;
776 }
777 
778 static void __maps__insert(struct maps *maps, struct map *map)
779 {
780         struct rb_node **p = &maps->entries.rb_node;
781         struct rb_node *parent = NULL;
782         const u64 ip = map->start;
783         struct map *m;
784 
785         while (*p != NULL) {
786                 parent = *p;
787                 m = rb_entry(parent, struct map, rb_node);
788                 if (ip < m->start)
789                         p = &(*p)->rb_left;
790                 else
791                         p = &(*p)->rb_right;
792         }
793 
794         rb_link_node(&map->rb_node, parent, p);
795         rb_insert_color(&map->rb_node, &maps->entries);
796         map__get(map);
797 }
798 
799 void maps__insert(struct maps *maps, struct map *map)
800 {
801         pthread_rwlock_wrlock(&maps->lock);
802         __maps__insert(maps, map);
803         pthread_rwlock_unlock(&maps->lock);
804 }
805 
806 static void __maps__remove(struct maps *maps, struct map *map)
807 {
808         rb_erase_init(&map->rb_node, &maps->entries);
809         map__put(map);
810 }
811 
812 void maps__remove(struct maps *maps, struct map *map)
813 {
814         pthread_rwlock_wrlock(&maps->lock);
815         __maps__remove(maps, map);
816         pthread_rwlock_unlock(&maps->lock);
817 }
818 
819 struct map *maps__find(struct maps *maps, u64 ip)
820 {
821         struct rb_node **p, *parent = NULL;
822         struct map *m;
823 
824         pthread_rwlock_rdlock(&maps->lock);
825 
826         p = &maps->entries.rb_node;
827         while (*p != NULL) {
828                 parent = *p;
829                 m = rb_entry(parent, struct map, rb_node);
830                 if (ip < m->start)
831                         p = &(*p)->rb_left;
832                 else if (ip >= m->end)
833                         p = &(*p)->rb_right;
834                 else
835                         goto out;
836         }
837 
838         m = NULL;
839 out:
840         pthread_rwlock_unlock(&maps->lock);
841         return m;
842 }
843 
844 struct map *maps__first(struct maps *maps)
845 {
846         struct rb_node *first = rb_first(&maps->entries);
847 
848         if (first)
849                 return rb_entry(first, struct map, rb_node);
850         return NULL;
851 }
852 
853 struct map *map__next(struct map *map)
854 {
855         struct rb_node *next = rb_next(&map->rb_node);
856 
857         if (next)
858                 return rb_entry(next, struct map, rb_node);
859         return NULL;
860 }
861 
862 struct kmap *map__kmap(struct map *map)
863 {
864         if (!map->dso || !map->dso->kernel) {
865                 pr_err("Internal error: map__kmap with a non-kernel map\n");
866                 return NULL;
867         }
868         return (struct kmap *)(map + 1);
869 }
870 
871 struct map_groups *map__kmaps(struct map *map)
872 {
873         struct kmap *kmap = map__kmap(map);
874 
875         if (!kmap || !kmap->kmaps) {
876                 pr_err("Internal error: map__kmaps with a non-kernel map\n");
877                 return NULL;
878         }
879         return kmap->kmaps;
880 }
881 

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