]>
Commit | Line | Data |
---|---|---|
2a75c0b6 | 1 | // -*- C++ -*- ARM specific Exception handling support routines. |
748086b7 | 2 | // Copyright (C) 2004, 2005, 2008, 2009 Free Software Foundation, Inc. |
2a75c0b6 PB |
3 | // |
4 | // This file is part of GCC. | |
5 | // | |
6 | // GCC is free software; you can redistribute it and/or modify | |
7 | // it under the terms of the GNU General Public License as published by | |
748086b7 | 8 | // the Free Software Foundation; either version 3, or (at your option) |
2a75c0b6 PB |
9 | // any later version. |
10 | // | |
11 | // GCC is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | // | |
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | // | |
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
2a75c0b6 PB |
24 | |
25 | #include <cxxabi.h> | |
26 | #include "unwind-cxx.h" | |
27 | ||
28 | #ifdef __ARM_EABI_UNWINDER__ | |
29 | ||
30 | using namespace __cxxabiv1; | |
31 | ||
32 | ||
33 | // Given the thrown type THROW_TYPE, pointer to a variable containing a | |
34 | // pointer to the exception object THROWN_PTR_P and a type CATCH_TYPE to | |
35 | // compare against, return whether or not there is a match and if so, | |
36 | // update *THROWN_PTR_P. | |
37 | ||
38 | extern "C" __cxa_type_match_result | |
39 | __cxa_type_match(_Unwind_Exception* ue_header, | |
40 | const std::type_info* catch_type, | |
41 | bool is_reference __attribute__((__unused__)), | |
42 | void** thrown_ptr_p) | |
43 | { | |
e32717fc JM |
44 | bool forced_unwind = __is_gxx_forced_unwind_class(ue_header->exception_class); |
45 | bool foreign_exception = !forced_unwind && !__is_gxx_exception_class(ue_header->exception_class); | |
30a333ce PC |
46 | bool dependent_exception = |
47 | __is_dependent_exception(ue_header->exception_class); | |
2a75c0b6 | 48 | __cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
30a333ce | 49 | __cxa_dependent_exception *dx = __get_dependent_exception_from_ue(ue_header); |
ddb4f387 RE |
50 | const std::type_info* throw_type; |
51 | ||
e32717fc JM |
52 | if (forced_unwind) |
53 | throw_type = &typeid(abi::__forced_unwind); | |
54 | else if (foreign_exception) | |
ddb4f387 | 55 | throw_type = &typeid(abi::__foreign_exception); |
30a333ce PC |
56 | else if (dependent_exception) |
57 | throw_type = __get_exception_header_from_obj | |
58 | (dx->primaryException)->exceptionType; | |
ddb4f387 RE |
59 | else |
60 | throw_type = xh->exceptionType; | |
61 | ||
2a75c0b6 PB |
62 | void* thrown_ptr = *thrown_ptr_p; |
63 | ||
64 | // Pointer types need to adjust the actual pointer, not | |
65 | // the pointer to pointer that is the exception object. | |
66 | // This also has the effect of passing pointer types | |
67 | // "by value" through the __cxa_begin_catch return value. | |
68 | if (throw_type->__is_pointer_p()) | |
69 | thrown_ptr = *(void**) thrown_ptr; | |
70 | ||
71 | if (catch_type->__do_catch(throw_type, &thrown_ptr, 1)) | |
72 | { | |
73 | *thrown_ptr_p = thrown_ptr; | |
74 | ||
75 | if (typeid(*catch_type) == typeid (typeid(void*))) | |
76 | { | |
77 | const __pointer_type_info *catch_pointer_type = | |
78 | static_cast<const __pointer_type_info *> (catch_type); | |
79 | const __pointer_type_info *throw_pointer_type = | |
80 | static_cast<const __pointer_type_info *> (throw_type); | |
81 | ||
82 | if (typeid (*catch_pointer_type->__pointee) != typeid (void) | |
83 | && (*catch_pointer_type->__pointee != | |
84 | *throw_pointer_type->__pointee)) | |
85 | return ctm_succeeded_with_ptr_to_base; | |
86 | } | |
87 | ||
88 | return ctm_succeeded; | |
89 | } | |
90 | ||
91 | return ctm_failed; | |
92 | } | |
93 | ||
94 | // ABI defined routine called at the start of a cleanup handler. | |
95 | extern "C" bool | |
96 | __cxa_begin_cleanup(_Unwind_Exception* ue_header) | |
97 | { | |
98 | __cxa_eh_globals *globals = __cxa_get_globals(); | |
99 | __cxa_exception *header = __get_exception_header_from_ue(ue_header); | |
1dcca6f3 | 100 | bool native = __is_gxx_exception_class(header->unwindHeader.exception_class); |
2a75c0b6 | 101 | |
1dcca6f3 NS |
102 | |
103 | if (native) | |
2a75c0b6 | 104 | { |
1dcca6f3 NS |
105 | header->propagationCount++; |
106 | // Add it to the chain if this is the first time we've seen this | |
107 | // exception. | |
108 | if (header->propagationCount == 1) | |
109 | { | |
110 | header->nextPropagatingException = globals->propagatingExceptions; | |
111 | globals->propagatingExceptions = header; | |
112 | } | |
2a75c0b6 | 113 | } |
1dcca6f3 | 114 | else |
2a75c0b6 | 115 | { |
1dcca6f3 NS |
116 | // Remember the exception object, so end_cleanup can return it. |
117 | // These cannot be stacked, so we must abort if we already have | |
118 | // a propagating exception. | |
119 | if (globals->propagatingExceptions) | |
120 | std::terminate (); | |
2a75c0b6 PB |
121 | globals->propagatingExceptions = header; |
122 | } | |
1dcca6f3 | 123 | |
c82f61c5 | 124 | return true; |
2a75c0b6 PB |
125 | } |
126 | ||
127 | // Do the work for __cxa_end_cleanup. Returns the currently propagating | |
128 | // exception object. | |
129 | extern "C" _Unwind_Exception * | |
130 | __gnu_end_cleanup(void) | |
131 | { | |
132 | __cxa_exception *header; | |
133 | __cxa_eh_globals *globals = __cxa_get_globals(); | |
134 | ||
135 | header = globals->propagatingExceptions; | |
136 | ||
137 | // Check something hasn't gone horribly wrong. | |
138 | if (!header) | |
139 | std::terminate(); | |
140 | ||
1dcca6f3 | 141 | if (__is_gxx_exception_class(header->unwindHeader.exception_class)) |
2a75c0b6 | 142 | { |
1dcca6f3 NS |
143 | header->propagationCount--; |
144 | if (header->propagationCount == 0) | |
145 | { | |
146 | // Remove exception from chain. | |
147 | globals->propagatingExceptions = header->nextPropagatingException; | |
148 | header->nextPropagatingException = NULL; | |
149 | } | |
2a75c0b6 | 150 | } |
1dcca6f3 NS |
151 | else |
152 | globals->propagatingExceptions = NULL; | |
153 | ||
2a75c0b6 PB |
154 | return &header->unwindHeader; |
155 | } | |
156 | ||
157 | // Assembly wrapper to call __gnu_end_cleanup without clobbering r1-r3. | |
158 | // Also push r4 to preserve stack alignment. | |
159 | #ifdef __thumb__ | |
160 | asm (".global __cxa_end_cleanup\n" | |
161 | " .type __cxa_end_cleanup, \"function\"\n" | |
162 | " .thumb_func\n" | |
163 | "__cxa_end_cleanup:\n" | |
164 | " push\t{r1, r2, r3, r4}\n" | |
165 | " bl\t__gnu_end_cleanup\n" | |
166 | " pop\t{r1, r2, r3, r4}\n" | |
167 | " bl\t_Unwind_Resume @ Never returns\n"); | |
168 | #else | |
169 | asm (".global __cxa_end_cleanup\n" | |
170 | " .type __cxa_end_cleanup, \"function\"\n" | |
171 | "__cxa_end_cleanup:\n" | |
172 | " stmfd\tsp!, {r1, r2, r3, r4}\n" | |
173 | " bl\t__gnu_end_cleanup\n" | |
174 | " ldmfd\tsp!, {r1, r2, r3, r4}\n" | |
175 | " bl\t_Unwind_Resume @ Never returns\n"); | |
176 | #endif | |
177 | ||
178 | #endif |