1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2003, 2005 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 #ifndef unwind_internal_h
27 #define unwind_internal_h
28
29 #define UNW_LOCAL_ONLY
30
31 #include <unwind.h>
32 #include <stdlib.h>
33 #include <libunwind.h>
34
35 #include "libunwind_i.h"
36
37 /* The version of the _Unwind_*() interface implemented by this code. */
38 #define _U_VERSION 1
39
40 typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)
41 (int, _Unwind_Action, uint64_t, struct _Unwind_Exception *,
42 struct _Unwind_Context *);
43
44 struct _Unwind_Context {
45 unw_cursor_t cursor;
46 int end_of_stack; /* set to 1 if the end of stack was reached */
47 };
48
49 /* This must be a macro because unw_getcontext() must be invoked from
50 the callee, even if optimization (and hence inlining) is turned
51 off. The macro arguments MUST NOT have any side-effects. */
52 #define _Unwind_InitContext(context, uc) \
53 ((context)->end_of_stack = 0, \
54 ((unw_getcontext (uc) < 0 || unw_init_local (&(context)->cursor, uc) < 0) \
55 ? -1 : 0))
56
57 static _Unwind_Reason_Code ALWAYS_INLINE
_Unwind_Phase2(struct _Unwind_Exception * exception_object,struct _Unwind_Context * context)58 _Unwind_Phase2 (struct _Unwind_Exception *exception_object,
59 struct _Unwind_Context *context)
60 {
61 _Unwind_Stop_Fn stop = (_Unwind_Stop_Fn) exception_object->private_1;
62 uint64_t exception_class = exception_object->exception_class;
63 void *stop_parameter = (void *) exception_object->private_2;
64 _Unwind_Personality_Fn personality;
65 _Unwind_Reason_Code reason;
66 _Unwind_Action actions;
67 unw_proc_info_t pi;
68 unw_word_t ip;
69 int ret;
70
71 actions = _UA_CLEANUP_PHASE;
72 if (stop)
73 actions |= _UA_FORCE_UNWIND;
74
75 while (1)
76 {
77 ret = unw_step (&context->cursor);
78 if (ret <= 0)
79 {
80 if (ret == 0)
81 {
82 actions |= _UA_END_OF_STACK;
83 context->end_of_stack = 1;
84 }
85 else
86 return _URC_FATAL_PHASE2_ERROR;
87 }
88
89 if (stop)
90 {
91 reason = (*stop) (_U_VERSION, actions, exception_class,
92 exception_object, context, stop_parameter);
93 if (reason != _URC_NO_REASON)
94 /* Stop function may return _URC_FATAL_PHASE2_ERROR if
95 it's unable to handle end-of-stack condition or
96 _URC_FATAL_PHASE2_ERROR if something is wrong. Not
97 that it matters: the resulting state is indeterminate
98 anyhow so we must return _URC_FATAL_PHASE2_ERROR... */
99 return _URC_FATAL_PHASE2_ERROR;
100 }
101
102 if (context->end_of_stack
103 || unw_get_proc_info (&context->cursor, &pi) < 0)
104 return _URC_FATAL_PHASE2_ERROR;
105
106 personality = (_Unwind_Personality_Fn) (uintptr_t) pi.handler;
107 if (personality)
108 {
109 if (!stop)
110 {
111 if (unw_get_reg (&context->cursor, UNW_REG_IP, &ip) < 0)
112 return _URC_FATAL_PHASE2_ERROR;
113
114 if ((unsigned long) stop_parameter == ip)
115 actions |= _UA_HANDLER_FRAME;
116 }
117
118 reason = (*personality) (_U_VERSION, actions, exception_class,
119 exception_object, context);
120 if (reason != _URC_CONTINUE_UNWIND)
121 {
122 if (reason == _URC_INSTALL_CONTEXT)
123 {
124 /* we may regain control via _Unwind_Resume() */
125 unw_resume (&context->cursor);
126 abort ();
127 }
128 else
129 return _URC_FATAL_PHASE2_ERROR;
130 }
131 if (actions & _UA_HANDLER_FRAME)
132 /* The personality routine for the handler-frame changed
133 it's mind; that's a no-no... */
134 abort ();
135 }
136 }
137 return _URC_FATAL_PHASE2_ERROR; /* shouldn't be reached */
138 }
139
140 #endif /* unwind_internal_h */
141