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