SAFE public projects git trees. - safe/jmp/linux-2.6/blob - tools/perf/util/map.c

   1 #include "event.h"
   2 #include "symbol.h"
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <stdio.h>
   6 #include "debug.h"
   7
   8 static inline int is_anon_memory(const char *filename)
   9 {
  10         return strcmp(filename, "//anon") == 0;
  11 }
  12
  13 static int strcommon(const char *pathname, char *cwd, int cwdlen)
  14 {
  15         int n = 0;
  16
  17         while (n < cwdlen && pathname[n] == cwd[n])
  18                 ++n;
  19
  20         return n;
  21 }
  22
  23 void map__init(struct map *self, enum map_type type,
  24                u64 start, u64 end, u64 pgoff, struct dso *dso)
  25 {
  26         self->type     = type;
  27         self->start    = start;
  28         self->end      = end;
  29         self->pgoff    = pgoff;
  30         self->dso      = dso;
  31         self->map_ip   = map__map_ip;
  32         self->unmap_ip = map__unmap_ip;
  33         RB_CLEAR_NODE(&self->rb_node);
  34 }
  35
  36 struct map *map__new(struct mmap_event *event, enum map_type type,
  37                      char *cwd, int cwdlen)
  38 {
  39         struct map *self = malloc(sizeof(*self));
  40
  41         if (self != NULL) {
  42                 const char *filename = event->filename;
  43                 char newfilename[PATH_MAX];
  44                 struct dso *dso;
  45                 int anon;
  46
  47                 if (cwd) {
  48                         int n = strcommon(filename, cwd, cwdlen);
  49
  50                         if (n == cwdlen) {
  51                                 snprintf(newfilename, sizeof(newfilename),
  52                                          ".%s", filename + n);
  53                                 filename = newfilename;
  54                         }
  55                 }
  56
  57                 anon = is_anon_memory(filename);
  58
  59                 if (anon) {
  60                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
  61                         filename = newfilename;
  62                 }
  63
  64                 dso = dsos__findnew(filename);
  65                 if (dso == NULL)
  66                         goto out_delete;
  67
  68                 map__init(self, type, event->start, event->start + event->len,
  69                           event->pgoff, dso);
  70
  71                 if (anon) {
  72 set_identity:
  73                         self->map_ip = self->unmap_ip = identity__map_ip;
  74                 } else if (strcmp(filename, "[vdso]") == 0) {
  75                         dso__set_loaded(dso, self->type);
  76                         goto set_identity;
  77                 }
  78         }
  79         return self;
  80 out_delete:
  81         free(self);
  82         return NULL;
  83 }
  84
  85 void map__delete(struct map *self)
  86 {
  87         free(self);
  88 }
  89
  90 void map__fixup_start(struct map *self)
  91 {
  92         struct rb_root *symbols = &self->dso->symbols[self->type];
  93         struct rb_node *nd = rb_first(symbols);
  94         if (nd != NULL) {
  95                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
  96                 self->start = sym->start;
  97         }
  98 }
  99
 100 void map__fixup_end(struct map *self)
 101 {
 102         struct rb_root *symbols = &self->dso->symbols[self->type];
 103         struct rb_node *nd = rb_last(symbols);
 104         if (nd != NULL) {
 105                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
 106                 self->end = sym->end;
 107         }
 108 }
 109
 110 #define DSO__DELETED "(deleted)"
 111
 112 int map__load(struct map *self, symbol_filter_t filter)
 113 {
 114         const char *name = self->dso->long_name;
 115         int nr;
 116
 117         if (dso__loaded(self->dso, self->type))
 118                 return 0;
 119
 120         nr = dso__load(self->dso, self, filter);
 121         if (nr < 0) {
 122                 if (self->dso->has_build_id) {
 123                         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 124
 125                         build_id__sprintf(self->dso->build_id,
 126                                           sizeof(self->dso->build_id),
 127                                           sbuild_id);
 128                         pr_warning("%s with build id %s not found",
 129                                    name, sbuild_id);
 130                 } else
 131                         pr_warning("Failed to open %s", name);
 132
 133                 pr_warning(", continuing without symbols\n");
 134                 return -1;
 135         } else if (nr == 0) {
 136                 const size_t len = strlen(name);
 137                 const size_t real_len = len - sizeof(DSO__DELETED);
 138
 139                 if (len > sizeof(DSO__DELETED) &&
 140                     strcmp(name + real_len + 1, DSO__DELETED) == 0) {
 141                         pr_warning("%.*s was updated, restart the long "
 142                                    "running apps that use it!\n",
 143                                    (int)real_len, name);
 144                 } else {
 145                         pr_warning("no symbols found in %s, maybe install "
 146                                    "a debug package?\n", name);
 147                 }
 148
 149                 return -1;
 150         }
 151         /*
 152          * Only applies to the kernel, as its symtabs aren't relative like the
 153          * module ones.
 154          */
 155         if (self->dso->kernel)
 156                 map__reloc_vmlinux(self);
 157
 158         return 0;
 159 }
 160
 161 struct symbol *map__find_symbol(struct map *self, u64 addr,
 162                                 symbol_filter_t filter)
 163 {
 164         if (map__load(self, filter) < 0)
 165                 return NULL;
 166
 167         return dso__find_symbol(self->dso, self->type, addr);
 168 }
 169
 170 struct symbol *map__find_symbol_by_name(struct map *self, const char *name,
 171                                         symbol_filter_t filter)
 172 {
 173         if (map__load(self, filter) < 0)
 174                 return NULL;
 175
 176         if (!dso__sorted_by_name(self->dso, self->type))
 177                 dso__sort_by_name(self->dso, self->type);
 178
 179         return dso__find_symbol_by_name(self->dso, self->type, name);
 180 }
 181
 182 struct map *map__clone(struct map *self)
 183 {
 184         struct map *map = malloc(sizeof(*self));
 185
 186         if (!map)
 187                 return NULL;
 188
 189         memcpy(map, self, sizeof(*self));
 190
 191         return map;
 192 }
 193
 194 int map__overlap(struct map *l, struct map *r)
 195 {
 196         if (l->start > r->start) {
 197                 struct map *t = l;
 198                 l = r;
 199                 r = t;
 200         }
 201
 202         if (l->end > r->start)
 203                 return 1;
 204
 205         return 0;
 206 }
 207
 208 size_t map__fprintf(struct map *self, FILE *fp)
 209 {
 210         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
 211                        self->start, self->end, self->pgoff, self->dso->name);
 212 }
 213
 214 /*
 215  * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
 216  * map->dso->adjust_symbols==1 for ET_EXEC-like cases.
 217  */
 218 u64 map__rip_2objdump(struct map *map, u64 rip)
 219 {
 220         u64 addr = map->dso->adjust_symbols ?
 221                         map->unmap_ip(map, rip) :       /* RIP -> IP */
 222                         rip;
 223         return addr;
 224 }