| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2014 The Android Open Source Project |
| |
| This file is part of libunwind. |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
| |
| #define UNW_LOCAL_ONLY |
| #include <libunwind.h> |
| #include "libunwind_i.h" |
| |
| /* Globals to hold the map data for local unwinds. */ |
| HIDDEN struct map_info *local_map_list = NULL; |
| HIDDEN int local_map_list_refs = 0; |
| HIDDEN lock_rdwr_var (local_rdwr_lock); |
| |
| PROTECTED void |
| unw_map_local_cursor_get (unw_map_cursor_t *map_cursor) |
| { |
| intrmask_t saved_mask; |
| |
| /* This function can be called before any other unwind code, so make sure |
| the lock has been initialized. */ |
| map_local_init (); |
| |
| lock_rdwr_wr_acquire (&local_rdwr_lock, saved_mask); |
| map_cursor->map_list = local_map_list; |
| map_cursor->cur_map = local_map_list; |
| lock_rdwr_release (&local_rdwr_lock, saved_mask); |
| } |
| |
| PROTECTED int |
| unw_map_local_cursor_valid (unw_map_cursor_t *map_cursor) |
| { |
| if (map_cursor->map_list == local_map_list) |
| return 0; |
| return -1; |
| } |
| |
| PROTECTED int |
| unw_map_local_create (void) |
| { |
| intrmask_t saved_mask; |
| int ret_value = 0; |
| |
| /* This function can be called before any other unwind code, so make sure |
| the lock has been initialized. */ |
| map_local_init (); |
| |
| lock_rdwr_wr_acquire (&local_rdwr_lock, saved_mask); |
| if (local_map_list_refs == 0) |
| { |
| local_map_list = map_create_list (UNW_MAP_CREATE_LOCAL, getpid()); |
| if (local_map_list != NULL) |
| local_map_list_refs = 1; |
| else |
| ret_value = -1; |
| } |
| else |
| local_map_list_refs++; |
| lock_rdwr_release (&local_rdwr_lock, saved_mask); |
| return ret_value; |
| } |
| |
| PROTECTED void |
| unw_map_local_destroy (void) |
| { |
| intrmask_t saved_mask; |
| |
| /* This function can be called before any other unwind code, so make sure |
| the lock has been initialized. */ |
| map_local_init (); |
| |
| lock_rdwr_wr_acquire (&local_rdwr_lock, saved_mask); |
| if (local_map_list != NULL && --local_map_list_refs == 0) |
| { |
| map_destroy_list (local_map_list); |
| local_map_list = NULL; |
| } |
| lock_rdwr_release (&local_rdwr_lock, saved_mask); |
| } |
| |
| PROTECTED int |
| unw_map_local_cursor_get_next (unw_map_cursor_t *map_cursor, unw_map_t *unw_map) |
| { |
| struct map_info *map_info = map_cursor->cur_map; |
| intrmask_t saved_mask; |
| int ret = 1; |
| |
| if (map_info == NULL) |
| return 0; |
| |
| /* This function can be called before any other unwind code, so make sure |
| the lock has been initialized. */ |
| map_local_init (); |
| |
| lock_rdwr_rd_acquire (&local_rdwr_lock, saved_mask); |
| if (map_cursor->map_list != local_map_list) |
| { |
| map_cursor->map_list = local_map_list; |
| ret = -UNW_EINVAL; |
| } |
| else |
| { |
| unw_map->start = map_info->start; |
| unw_map->end = map_info->end; |
| unw_map->offset = map_info->offset; |
| unw_map->load_base = map_info->load_base; |
| unw_map->flags = map_info->flags; |
| if (map_info->path) |
| unw_map->path = strdup (map_info->path); |
| else |
| unw_map->path = NULL; |
| |
| map_cursor->cur_map = map_info->next; |
| } |
| lock_rdwr_release (&local_rdwr_lock, saved_mask); |
| |
| return ret; |
| } |