1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2003-2004 Hewlett-Packard Co
3 Contributed by David Mosberger-Tang <davidm@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
_Unwind_RaiseException(struct _Unwind_Exception * exception_object)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