1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2008 CodeSourcery
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 "unwind_i.h"
26 #include "dwarf_i.h"
27
28 HIDDEN define_lock (arm_lock);
29 HIDDEN atomic_bool tdep_init_done = 0;
30
31 /* Unwinding methods to use. See UNW_METHOD_ enums */
32 #if defined(__ANDROID__)
33 /* Android only supports three types of unwinding methods. */
34 HIDDEN int unwi_unwind_method = UNW_ARM_METHOD_DWARF | UNW_ARM_METHOD_EXIDX | UNW_ARM_METHOD_LR;
35 #else
36 HIDDEN int unwi_unwind_method = UNW_ARM_METHOD_ALL;
37 #endif
38
39 HIDDEN void
tdep_init(void)40 tdep_init (void)
41 {
42 intrmask_t saved_mask;
43
44 sigfillset (&unwi_full_mask);
45
46 lock_acquire (&arm_lock, saved_mask);
47 {
48 if (atomic_load(&tdep_init_done))
49 /* another thread else beat us to it... */
50 goto out;
51
52 /* read ARM unwind method setting */
53 const char* str = getenv ("UNW_ARM_UNWIND_METHOD");
54 if (str)
55 {
56 unwi_unwind_method = atoi (str);
57 }
58
59 mi_init ();
60
61 dwarf_init ();
62
63 #ifndef UNW_REMOTE_ONLY
64 tdep_init_mem_validate ();
65 arm_local_addr_space_init ();
66 #endif
67 atomic_store(&tdep_init_done, 1); /* signal that we're initialized... */
68 }
69 out:
70 lock_release (&arm_lock, saved_mask);
71 }
72