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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2003-2004 Hewlett-Packard Co
      3 	Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com>
      4 
      5 This file is part of libunwind.
      6 
      7 Permission is hereby granted, free of charge, to any person obtaining
      8 a copy of this software and associated documentation files (the
      9 "Software"), to deal in the Software without restriction, including
     10 without limitation the rights to use, copy, modify, merge, publish,
     11 distribute, sublicense, and/or sell copies of the Software, and to
     12 permit persons to whom the Software is furnished to do so, subject to
     13 the following conditions:
     14 
     15 The above copyright notice and this permission notice shall be
     16 included in all copies or substantial portions of the Software.
     17 
     18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
     25 
     26 #include "unwind-internal.h"
     27 
     28 /* ANDROID support update. */
     29 PROTECTED _Unwind_Reason_Code
     30 _Unwind_RaiseException (struct _Unwind_Exception *exception_object)
     31 {
     32   uint64_t exception_class = exception_object->exception_class;
     33   _Unwind_Personality_Fn personality;
     34   struct _Unwind_Context context;
     35   _Unwind_Reason_Code reason;
     36   unw_proc_info_t pi;
     37   unw_context_t uc;
     38   unw_word_t ip;
     39   int ret;
     40   int destroy_map = 1;
     41 
     42   Debug (1, "(exception_object=%p)\n", exception_object);
     43 
     44   unw_map_local_create ();
     45 
     46   if (_Unwind_InitContext (&context, &uc) < 0)
     47     {
     48       ret = _URC_FATAL_PHASE1_ERROR;
     49       goto done;
     50     }
     51 
     52   /* Phase 1 (search phase) */
     53 
     54   while (1)
     55     {
     56       if (unw_step (&context.cursor) <= 0)
     57 	{
     58 	  Debug (1, "no handler found\n");
     59 	  ret = _URC_END_OF_STACK;
     60 	  goto done;
     61 	}
     62 
     63       if (unw_get_proc_info (&context.cursor, &pi) < 0)
     64         {
     65 	  ret = _URC_FATAL_PHASE1_ERROR;
     66 	  goto done;
     67         }
     68 
     69       personality = (_Unwind_Personality_Fn) (uintptr_t) pi.handler;
     70       if (personality)
     71 	{
     72 	  reason = (*personality) (_U_VERSION, _UA_SEARCH_PHASE,
     73 				   exception_class, exception_object,
     74 				   &context);
     75 	  if (reason != _URC_CONTINUE_UNWIND)
     76 	    {
     77 	      if (reason == _URC_HANDLER_FOUND)
     78 		break;
     79 	      else
     80 		{
     81 		  Debug (1, "personality returned %d\n", reason);
     82 		  ret = _URC_FATAL_PHASE1_ERROR;
     83 		  goto done;
     84 		}
     85 	    }
     86 	}
     87     }
     88 
     89   /* Exceptions are associated with IP-ranges.  If a given exception
     90      is handled at a particular IP, it will _always_ be handled at
     91      that IP.  If this weren't true, we'd have to track the tuple
     92      (IP,SP,BSP) to uniquely identify the stack frame that's handling
     93      the exception.  */
     94   if (unw_get_reg (&context.cursor, UNW_REG_IP, &ip) < 0)
     95     ret = _URC_FATAL_PHASE1_ERROR;
     96   else
     97     {
     98       exception_object->private_1 = 0;	/* clear "stop" pointer */
     99       exception_object->private_2 = ip;	/* save frame marker */
    100 
    101       Debug (1, "found handler for IP=%lx; entering cleanup phase\n", (long) ip);
    102 
    103       /* Reset the cursor to the first frame: */
    104       if (unw_init_local (&context.cursor, &uc) < 0)
    105         ret = _URC_FATAL_PHASE1_ERROR;
    106       else
    107         ret = _Unwind_Phase2 (exception_object, &context, &destroy_map);
    108     }
    109 
    110 done:
    111   if (destroy_map)
    112     unw_map_local_destroy ();
    113 
    114   return ret;
    115 }
    116 /* End ANDROID support. */
    117 
    118 _Unwind_Reason_Code
    119 __libunwind_Unwind_RaiseException (struct _Unwind_Exception *)
    120      ALIAS (_Unwind_RaiseException);
    121