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      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 int tdep_init_done;
     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
     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 (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     arm_local_addr_space_init ();
     65 #endif
     66     tdep_init_done = 1;	/* signal that we're initialized... */
     67   }
     68  out:
     69   lock_release (&arm_lock, saved_mask);
     70 }
     71