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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 #include <inttypes.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <linux/string.h>
 #include <linux/zalloc.h>
 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
 #include "debug.h"
 #include "dso.h"
 #include "map.h"
 #include "namespaces.h"
 #include "srcline.h"
 #include "symbol.h"
 #include "thread.h"
 #include "vdso.h"
 
 static inline int is_android_lib(const char *filename)
 {
     return strstarts(filename, "/data/app-lib/") ||
            strstarts(filename, "/system/lib/");
 }
 
 static inline bool replace_android_lib(const char *filename, char *newfilename)
 {
     const char *libname;
     char *app_abi;
     size_t app_abi_length, new_length;
     size_t lib_length = 0;
 
     libname  = strrchr(filename, '/');
     if (libname)
         lib_length = strlen(libname);
 
     app_abi = getenv("APP_ABI");
     if (!app_abi)
         return false;
 
     app_abi_length = strlen(app_abi);
 
     if (strstarts(filename, "/data/app-lib/")) {
         char *apk_path;
 
         if (!app_abi_length)
             return false;
 
         new_length = 7 + app_abi_length + lib_length;
 
         apk_path = getenv("APK_PATH");
         if (apk_path) {
             new_length += strlen(apk_path) + 1;
             if (new_length > PATH_MAX)
                 return false;
             snprintf(newfilename, new_length,
                  "%s/libs/%s/%s", apk_path, app_abi, libname);
         } else {
             if (new_length > PATH_MAX)
                 return false;
             snprintf(newfilename, new_length,
                  "libs/%s/%s", app_abi, libname);
         }
         return true;
     }
 
     if (strstarts(filename, "/system/lib/")) {
         char *ndk, *app;
         const char *arch;
         int ndk_length, app_length;
 
         ndk = getenv("NDK_ROOT");
         app = getenv("APP_PLATFORM");
 
         if (!(ndk && app))
             return false;
 
         ndk_length = strlen(ndk);
         app_length = strlen(app);
 
         if (!(ndk_length && app_length && app_abi_length))
             return false;
 
         arch = !strncmp(app_abi, "arm", 3) ? "arm" :
                !strncmp(app_abi, "mips", 4) ? "mips" :
                !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
 
         if (!arch)
             return false;
 
         new_length = 27 + ndk_length +
                  app_length + lib_length
                + strlen(arch);
 
         if (new_length > PATH_MAX)
             return false;
         snprintf(newfilename, new_length,
             "%.*s/platforms/%.*s/arch-%s/usr/lib/%s",
             ndk_length, ndk, app_length, app, arch, libname);
 
         return true;
     }
     return false;
 }
 
 void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
 {
     map->start    = start;
     map->end      = end;
     map->pgoff    = pgoff;
     map->reloc    = 0;
     map->dso      = dso__get(dso);
     map->map_ip   = map__map_ip;
     map->unmap_ip = map__unmap_ip;
     RB_CLEAR_NODE(&map->rb_node);
     map->erange_warned = false;
     refcount_set(&map->refcnt, 1);
 }
 
 struct map *map__new(struct machine *machine, u64 start, u64 len,
              u64 pgoff, struct dso_id *id,
              u32 prot, u32 flags, struct build_id *bid,
              char *filename, struct thread *thread)
 {
     struct map *map = malloc(sizeof(*map));
     struct nsinfo *nsi = NULL;
     struct nsinfo *nnsi;
 
     if (map != NULL) {
         char newfilename[PATH_MAX];
         struct dso *dso, *header_bid_dso;
         int anon, no_dso, vdso, android;
 
         android = is_android_lib(filename);
         anon = is_anon_memory(filename) || flags & MAP_HUGETLB;
         vdso = is_vdso_map(filename);
         no_dso = is_no_dso_memory(filename);
         map->prot = prot;
         map->flags = flags;
         nsi = nsinfo__get(thread->nsinfo);
 
         if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {
             snprintf(newfilename, sizeof(newfilename),
                  "/tmp/perf-%d.map", nsinfo__pid(nsi));
             filename = newfilename;
         }
 
         if (android) {
             if (replace_android_lib(filename, newfilename))
                 filename = newfilename;
         }
 
         if (vdso) {
             /* The vdso maps are always on the host and not the
              * container.  Ensure that we don't use setns to look
              * them up.
              */
             nnsi = nsinfo__copy(nsi);
             if (nnsi) {
                 nsinfo__put(nsi);
                 nsinfo__clear_need_setns(nnsi);
                 nsi = nnsi;
             }
             pgoff = 0;
             dso = machine__findnew_vdso(machine, thread);
         } else
             dso = machine__findnew_dso_id(machine, filename, id);
 
         if (dso == NULL)
             goto out_delete;
 
         map__init(map, start, start + len, pgoff, dso);
 
         if (anon || no_dso) {
             map->map_ip = map->unmap_ip = identity__map_ip;
 
             /*
              * Set memory without DSO as loaded. All map__find_*
              * functions still return NULL, and we avoid the
              * unnecessary map__load warning.
              */
             if (!(prot & PROT_EXEC))
                 dso__set_loaded(dso);
         }
         dso->nsinfo = nsi;
 
         if (build_id__is_defined(bid)) {
             dso__set_build_id(dso, bid);
         } else {
             /*
              * If the mmap event had no build ID, search for an existing dso from the
              * build ID header by name. Otherwise only the dso loaded at the time of
              * reading the header will have the build ID set and all future mmaps will
              * have it missing.
              */
             down_read(&machine->dsos.lock);
             header_bid_dso = __dsos__find(&machine->dsos, filename, false);
             up_read(&machine->dsos.lock);
             if (header_bid_dso && header_bid_dso->header_build_id) {
                 dso__set_build_id(dso, &header_bid_dso->bid);
                 dso->header_build_id = 1;
             }
         }
         dso__put(dso);
     }
     return map;
 out_delete:
     nsinfo__put(nsi);
     free(map);
     return NULL;
 }
 
 /*
  * Constructor variant for modules (where we know from /proc/modules where
  * they are loaded) and for vmlinux, where only after we load all the
  * symbols we'll know where it starts and ends.
  */
 struct map *map__new2(u64 start, struct dso *dso)
 {
     struct map *map = calloc(1, (sizeof(*map) +
                      (dso->kernel ? sizeof(struct kmap) : 0)));
     if (map != NULL) {
         /*
          * ->end will be filled after we load all the symbols
          */
         map__init(map, start, 0, 0, dso);
     }
 
     return map;
 }
 
 bool __map__is_kernel(const struct map *map)
 {
     if (!map->dso->kernel)
         return false;
     return machine__kernel_map(map__kmaps((struct map *)map)->machine) == map;
 }
 
 bool __map__is_extra_kernel_map(const struct map *map)
 {
     struct kmap *kmap = __map__kmap((struct map *)map);
 
     return kmap && kmap->name[0];
 }
 
 bool __map__is_bpf_prog(const struct map *map)
 {
     const char *name;
 
     if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
         return true;
 
     /*
      * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
      * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
      * guess the type based on name.
      */
     name = map->dso->short_name;
     return name && (strstr(name, "bpf_prog_") == name);
 }
 
 bool __map__is_bpf_image(const struct map *map)
 {
     const char *name;
 
     if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
         return true;
 
     /*
      * If PERF_RECORD_KSYMBOL is not included, the dso will not have
      * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
      * guess the type based on name.
      */
     name = map->dso->short_name;
     return name && is_bpf_image(name);
 }
 
 bool __map__is_ool(const struct map *map)
 {
     return map->dso && map->dso->binary_type == DSO_BINARY_TYPE__OOL;
 }
 
 bool map__has_symbols(const struct map *map)
 {
     return dso__has_symbols(map->dso);
 }
 
 static void map__exit(struct map *map)
 {
     BUG_ON(refcount_read(&map->refcnt) != 0);
     dso__zput(map->dso);
 }
 
 void map__delete(struct map *map)
 {
     map__exit(map);
     free(map);
 }
 
 void map__put(struct map *map)
 {
     if (map && refcount_dec_and_test(&map->refcnt))
         map__delete(map);
 }
 
 void map__fixup_start(struct map *map)
 {
     struct rb_root_cached *symbols = &map->dso->symbols;
     struct rb_node *nd = rb_first_cached(symbols);
     if (nd != NULL) {
         struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
         map->start = sym->start;
     }
 }
 
 void map__fixup_end(struct map *map)
 {
     struct rb_root_cached *symbols = &map->dso->symbols;
     struct rb_node *nd = rb_last(&symbols->rb_root);
     if (nd != NULL) {
         struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
         map->end = sym->end;
     }
 }
 
 #define DSO__DELETED "(deleted)"
 
 int map__load(struct map *map)
 {
     const char *name = map->dso->long_name;
     int nr;
 
     if (dso__loaded(map->dso))
         return 0;
 
     nr = dso__load(map->dso, map);
     if (nr < 0) {
         if (map->dso->has_build_id) {
             char sbuild_id[SBUILD_ID_SIZE];
 
             build_id__sprintf(&map->dso->bid, sbuild_id);
             pr_debug("%s with build id %s not found", name, sbuild_id);
         } else
             pr_debug("Failed to open %s", name);
 
         pr_debug(", continuing without symbols\n");
         return -1;
     } else if (nr == 0) {
 #ifdef HAVE_LIBELF_SUPPORT
         const size_t len = strlen(name);
         const size_t real_len = len - sizeof(DSO__DELETED);
 
         if (len > sizeof(DSO__DELETED) &&
             strcmp(name + real_len + 1, DSO__DELETED) == 0) {
             pr_debug("%.*s was updated (is prelink enabled?). "
                 "Restart the long running apps that use it!\n",
                    (int)real_len, name);
         } else {
             pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
         }
 #endif
         return -1;
     }
 
     return 0;
 }
 
 struct symbol *map__find_symbol(struct map *map, u64 addr)
 {
     if (map__load(map) < 0)
         return NULL;
 
     return dso__find_symbol(map->dso, addr);
 }
 
 struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
 {
     if (map__load(map) < 0)
         return NULL;
 
     if (!dso__sorted_by_name(map->dso))
         dso__sort_by_name(map->dso);
 
     return dso__find_symbol_by_name(map->dso, name);
 }
 
 struct map *map__clone(struct map *from)
 {
     size_t size = sizeof(struct map);
     struct map *map;
 
     if (from->dso && from->dso->kernel)
         size += sizeof(struct kmap);
 
     map = memdup(from, size);
     if (map != NULL) {
         refcount_set(&map->refcnt, 1);
         RB_CLEAR_NODE(&map->rb_node);
         dso__get(map->dso);
     }
 
     return map;
 }
 
 size_t map__fprintf(struct map *map, FILE *fp)
 {
     return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
                map->start, map->end, map->pgoff, map->dso->name);
 }
 
 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
 {
     char buf[symbol_conf.pad_output_len_dso + 1];
     const char *dsoname = "[unknown]";
 
     if (map && map->dso) {
         if (symbol_conf.show_kernel_path && map->dso->long_name)
             dsoname = map->dso->long_name;
         else
             dsoname = map->dso->name;
     }
 
     if (symbol_conf.pad_output_len_dso) {
         scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
         dsoname = buf;
     }
 
     return fprintf(fp, "%s", dsoname);
 }
 
 char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
 {
     if (map == NULL)
         return SRCLINE_UNKNOWN;
     return get_srcline(map->dso, map__rip_2objdump(map, addr), sym, true, true, addr);
 }
 
 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
              FILE *fp)
 {
     int ret = 0;
 
     if (map && map->dso) {
         char *srcline = map__srcline(map, addr, NULL);
         if (strncmp(srcline, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)
             ret = fprintf(fp, "%s%s", prefix, srcline);
         free_srcline(srcline);
     }
     return ret;
 }
 
 void srccode_state_free(struct srccode_state *state)
 {
     zfree(&state->srcfile);
     state->line = 0;
 }
 
 /**
  * map__rip_2objdump - convert symbol start address to objdump address.
  * @map: memory map
  * @rip: symbol start address
  *
  * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
  * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
  * relative to section start.
  *
  * Return: Address suitable for passing to "objdump --start-address="
  */
 u64 map__rip_2objdump(struct map *map, u64 rip)
 {
     struct kmap *kmap = __map__kmap(map);
 
     /*
      * vmlinux does not have program headers for PTI entry trampolines and
      * kcore may not either. However the trampoline object code is on the
      * main kernel map, so just use that instead.
      */
     if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {
         struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine);
 
         if (kernel_map)
             map = kernel_map;
     }
 
     if (!map->dso->adjust_symbols)
         return rip;
 
     if (map->dso->rel)
         return rip - map->pgoff;
 
     /*
      * kernel modules also have DSO_TYPE_USER in dso->kernel,
      * but all kernel modules are ET_REL, so won't get here.
      */
     if (map->dso->kernel == DSO_SPACE__USER)
         return rip + map->dso->text_offset;
 
     return map->unmap_ip(map, rip) - map->reloc;
 }
 
 /**
  * map__objdump_2mem - convert objdump address to a memory address.
  * @map: memory map
  * @ip: objdump address
  *
  * Closely related to map__rip_2objdump(), this function takes an address from
  * objdump and converts it to a memory address.  Note this assumes that @map
  * contains the address.  To be sure the result is valid, check it forwards
  * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
  *
  * Return: Memory address.
  */
 u64 map__objdump_2mem(struct map *map, u64 ip)
 {
     if (!map->dso->adjust_symbols)
         return map->unmap_ip(map, ip);
 
     if (map->dso->rel)
         return map->unmap_ip(map, ip + map->pgoff);
 
     /*
      * kernel modules also have DSO_TYPE_USER in dso->kernel,
      * but all kernel modules are ET_REL, so won't get here.
      */
     if (map->dso->kernel == DSO_SPACE__USER)
         return map->unmap_ip(map, ip - map->dso->text_offset);
 
     return ip + map->reloc;
 }
 
 bool map__contains_symbol(const struct map *map, const struct symbol *sym)
 {
     u64 ip = map->unmap_ip(map, sym->start);
 
     return ip >= map->start && ip < map->end;
 }
 
 static struct map *__map__next(struct map *map)
 {
     struct rb_node *next = rb_next(&map->rb_node);
 
     if (next)
         return rb_entry(next, struct map, rb_node);
     return NULL;
 }
 
 struct map *map__next(struct map *map)
 {
     return map ? __map__next(map) : NULL;
 }
 
 struct kmap *__map__kmap(struct map *map)
 {
     if (!map->dso || !map->dso->kernel)
         return NULL;
     return (struct kmap *)(map + 1);
 }
 
 struct kmap *map__kmap(struct map *map)
 {
     struct kmap *kmap = __map__kmap(map);
 
     if (!kmap)
         pr_err("Internal error: map__kmap with a non-kernel map\n");
     return kmap;
 }
 
 struct maps *map__kmaps(struct map *map)
 {
     struct kmap *kmap = map__kmap(map);
 
     if (!kmap || !kmap->kmaps) {
         pr_err("Internal error: map__kmaps with a non-kernel map\n");
         return NULL;
     }
     return kmap->kmaps;
 }
 
 u64 map__map_ip(const struct map *map, u64 ip)
 {
     return ip - map->start + map->pgoff;
 }
 
 u64 map__unmap_ip(const struct map *map, u64 ip)
 {
     return ip + map->start - map->pgoff;
 }
 
 u64 identity__map_ip(const struct map *map __maybe_unused, u64 ip)
 {
     return ip;
 }

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