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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2014 The Android Open Source Project
      3 
      4 This file is part of libunwind.
      5 
      6 Permission is hereby granted, free of charge, to any person obtaining
      7 a copy of this software and associated documentation files (the
      8 "Software"), to deal in the Software without restriction, including
      9 without limitation the rights to use, copy, modify, merge, publish,
     10 distribute, sublicense, and/or sell copies of the Software, and to
     11 permit persons to whom the Software is furnished to do so, subject to
     12 the following conditions:
     13 
     14 The above copyright notice and this permission notice shall be
     15 included in all copies or substantial portions of the Software.
     16 
     17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     21 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     22 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
     24 
     25 #include <libunwind.h>
     26 #include "libunwind_i.h"
     27 
     28 HIDDEN int map_init_done = 0;
     29 HIDDEN define_lock (map_init_lock);
     30 HIDDEN struct mempool map_pool;
     31 
     32 PROTECTED void
     33 unw_map_set (unw_addr_space_t as, unw_map_cursor_t *map_cursor)
     34 {
     35   if (map_cursor != NULL)
     36     as->map_list = map_cursor->map_list;
     37   else
     38     as->map_list = NULL;
     39 }
     40 
     41 PROTECTED int
     42 unw_map_cursor_create (unw_map_cursor_t *map_cursor, pid_t pid)
     43 {
     44   map_cursor->map_list = map_create_list (pid);
     45 
     46   return map_cursor->map_list == NULL;
     47 }
     48 
     49 PROTECTED void
     50 unw_map_cursor_destroy (unw_map_cursor_t *map_cursor)
     51 {
     52   map_destroy_list (map_cursor->map_list);
     53 }
     54 
     55 PROTECTED void
     56 unw_map_cursor_reset (unw_map_cursor_t *map_cursor)
     57 {
     58   map_cursor->cur_map = map_cursor->map_list;
     59 }
     60 
     61 PROTECTED void
     62 unw_map_cursor_clear (unw_map_cursor_t *cursor_map)
     63 {
     64   cursor_map->map_list = NULL;
     65   cursor_map->cur_map = NULL;
     66 }
     67 
     68 PROTECTED int
     69 unw_map_cursor_get_next (unw_map_cursor_t *map_cursor, unw_map_t *unw_map)
     70 {
     71   struct map_info *map_info = map_cursor->cur_map;
     72 
     73   if (map_info == NULL)
     74     return 0;
     75 
     76   unw_map->start = map_info->start;
     77   unw_map->end = map_info->end;
     78   unw_map->flags = map_info->flags;
     79   unw_map->path = map_info->path;
     80 
     81   map_cursor->cur_map = map_info->next;
     82 
     83   return 1;
     84 }
     85 
     86 HIDDEN struct map_info *
     87 map_alloc_info (void)
     88 {
     89   if (!map_init_done)
     90     {
     91       intrmask_t saved_mask;
     92 
     93       lock_acquire (&map_init_lock, saved_mask);
     94       /* Check again under the lock. */
     95       if (!map_init_done)
     96         {
     97           mempool_init (&map_pool, sizeof(struct map_info), 0);
     98           map_init_done = 1;
     99         }
    100       lock_release (&map_init_lock, saved_mask);
    101     }
    102   return mempool_alloc (&map_pool);
    103 }
    104 
    105 HIDDEN void
    106 map_free_info (struct map_info *map)
    107 {
    108   mempool_free (&map_pool, map);
    109 }
    110 
    111 HIDDEN void
    112 map_destroy_list (struct map_info *map_info)
    113 {
    114   struct map_info *map;
    115   while (map_info)
    116     {
    117       map = map_info;
    118       map_info = map->next;
    119       if (map->ei.image != MAP_FAILED && map->ei.image != NULL)
    120         munmap (map->ei.image, map->ei.size);
    121       if (map->path)
    122         free (map->path);
    123       map_free_info (map);
    124     }
    125 }
    126 
    127 HIDDEN struct map_info *
    128 map_find_from_addr (struct map_info *map_list, unw_word_t addr)
    129 {
    130   while (map_list)
    131     {
    132       if (addr >= map_list->start && addr < map_list->end)
    133         return map_list;
    134       map_list = map_list->next;
    135     }
    136   return NULL;
    137 }
    138