1 |
742 |
jeremybenn |
// -*- C++ -*- ARM specific Exception handling support routines.
|
2 |
|
|
// Copyright (C) 2004, 2005, 2008, 2009, 2010 Free Software Foundation, Inc.
|
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
|
8 |
|
|
// the Free Software Foundation; either version 3, or (at your option)
|
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 |
|
|
//
|
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/>.
|
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, exception object UE_HEADER and a
|
34 |
|
|
// type CATCH_TYPE to compare against, return whether or not there is
|
35 |
|
|
// a match and if so, update *THROWN_PTR_P to point to either the
|
36 |
|
|
// type-matched object, or in the case of a pointer type, the object
|
37 |
|
|
// pointed to by the pointer.
|
38 |
|
|
|
39 |
|
|
extern "C" __cxa_type_match_result
|
40 |
|
|
__cxa_type_match(_Unwind_Exception* ue_header,
|
41 |
|
|
const std::type_info* catch_type,
|
42 |
|
|
bool is_reference __attribute__((__unused__)),
|
43 |
|
|
void** thrown_ptr_p)
|
44 |
|
|
{
|
45 |
|
|
bool forced_unwind
|
46 |
|
|
= __is_gxx_forced_unwind_class(ue_header->exception_class);
|
47 |
|
|
bool foreign_exception
|
48 |
|
|
= !forced_unwind && !__is_gxx_exception_class(ue_header->exception_class);
|
49 |
|
|
bool dependent_exception
|
50 |
|
|
= __is_dependent_exception(ue_header->exception_class);
|
51 |
|
|
__cxa_exception* xh = __get_exception_header_from_ue(ue_header);
|
52 |
|
|
__cxa_dependent_exception *dx = __get_dependent_exception_from_ue(ue_header);
|
53 |
|
|
const std::type_info* throw_type;
|
54 |
|
|
void *thrown_ptr = 0;
|
55 |
|
|
|
56 |
|
|
if (forced_unwind)
|
57 |
|
|
throw_type = &typeid(abi::__forced_unwind);
|
58 |
|
|
else if (foreign_exception)
|
59 |
|
|
throw_type = &typeid(abi::__foreign_exception);
|
60 |
|
|
else
|
61 |
|
|
{
|
62 |
|
|
if (dependent_exception)
|
63 |
|
|
xh = __get_exception_header_from_obj (dx->primaryException);
|
64 |
|
|
throw_type = xh->exceptionType;
|
65 |
|
|
// We used to require the caller set the target of thrown_ptr_p,
|
66 |
|
|
// but that's incorrect -- the EHABI makes no such requirement
|
67 |
|
|
// -- and not all callers will set it. Fortunately callers that
|
68 |
|
|
// do initialize will always pass us the value we calculate
|
69 |
|
|
// here, so there's no backwards compatibility problem.
|
70 |
|
|
thrown_ptr = __get_object_from_ue (ue_header);
|
71 |
|
|
}
|
72 |
|
|
|
73 |
|
|
__cxa_type_match_result result = ctm_succeeded;
|
74 |
|
|
|
75 |
|
|
// Pointer types need to adjust the actual pointer, not
|
76 |
|
|
// the pointer to pointer that is the exception object.
|
77 |
|
|
// This also has the effect of passing pointer types
|
78 |
|
|
// "by value" through the __cxa_begin_catch return value.
|
79 |
|
|
if (throw_type->__is_pointer_p())
|
80 |
|
|
{
|
81 |
|
|
thrown_ptr = *(void**) thrown_ptr;
|
82 |
|
|
// We need to indicate the indirection to our caller.
|
83 |
|
|
result = ctm_succeeded_with_ptr_to_base;
|
84 |
|
|
}
|
85 |
|
|
|
86 |
|
|
if (catch_type->__do_catch(throw_type, &thrown_ptr, 1))
|
87 |
|
|
{
|
88 |
|
|
*thrown_ptr_p = thrown_ptr;
|
89 |
|
|
return result;
|
90 |
|
|
}
|
91 |
|
|
|
92 |
|
|
return ctm_failed;
|
93 |
|
|
}
|
94 |
|
|
|
95 |
|
|
// ABI defined routine called at the start of a cleanup handler.
|
96 |
|
|
extern "C" bool
|
97 |
|
|
__cxa_begin_cleanup(_Unwind_Exception* ue_header)
|
98 |
|
|
{
|
99 |
|
|
__cxa_eh_globals *globals = __cxa_get_globals();
|
100 |
|
|
__cxa_exception *header = __get_exception_header_from_ue(ue_header);
|
101 |
|
|
bool native = __is_gxx_exception_class(header->unwindHeader.exception_class);
|
102 |
|
|
|
103 |
|
|
|
104 |
|
|
if (native)
|
105 |
|
|
{
|
106 |
|
|
header->propagationCount++;
|
107 |
|
|
// Add it to the chain if this is the first time we've seen this
|
108 |
|
|
// exception.
|
109 |
|
|
if (header->propagationCount == 1)
|
110 |
|
|
{
|
111 |
|
|
header->nextPropagatingException = globals->propagatingExceptions;
|
112 |
|
|
globals->propagatingExceptions = header;
|
113 |
|
|
}
|
114 |
|
|
}
|
115 |
|
|
else
|
116 |
|
|
{
|
117 |
|
|
// Remember the exception object, so end_cleanup can return it.
|
118 |
|
|
// These cannot be stacked, so we must abort if we already have
|
119 |
|
|
// a propagating exception.
|
120 |
|
|
if (globals->propagatingExceptions)
|
121 |
|
|
std::terminate ();
|
122 |
|
|
globals->propagatingExceptions = header;
|
123 |
|
|
}
|
124 |
|
|
|
125 |
|
|
return true;
|
126 |
|
|
}
|
127 |
|
|
|
128 |
|
|
// Do the work for __cxa_end_cleanup. Returns the currently propagating
|
129 |
|
|
// exception object.
|
130 |
|
|
extern "C" _Unwind_Exception *
|
131 |
|
|
__gnu_end_cleanup(void)
|
132 |
|
|
{
|
133 |
|
|
__cxa_exception *header;
|
134 |
|
|
__cxa_eh_globals *globals = __cxa_get_globals();
|
135 |
|
|
|
136 |
|
|
header = globals->propagatingExceptions;
|
137 |
|
|
|
138 |
|
|
// Check something hasn't gone horribly wrong.
|
139 |
|
|
if (!header)
|
140 |
|
|
std::terminate();
|
141 |
|
|
|
142 |
|
|
if (__is_gxx_exception_class(header->unwindHeader.exception_class))
|
143 |
|
|
{
|
144 |
|
|
header->propagationCount--;
|
145 |
|
|
if (header->propagationCount == 0)
|
146 |
|
|
{
|
147 |
|
|
// Remove exception from chain.
|
148 |
|
|
globals->propagatingExceptions = header->nextPropagatingException;
|
149 |
|
|
header->nextPropagatingException = NULL;
|
150 |
|
|
}
|
151 |
|
|
}
|
152 |
|
|
else
|
153 |
|
|
globals->propagatingExceptions = NULL;
|
154 |
|
|
|
155 |
|
|
return &header->unwindHeader;
|
156 |
|
|
}
|
157 |
|
|
|
158 |
|
|
#ifdef __TMS320C6X__
|
159 |
|
|
// Assembly wrapper to call __gnu_end_cleanup without clobbering
|
160 |
|
|
// function arguments to _Unwind_Resume.
|
161 |
|
|
asm (".global __cxa_end_cleanup\n"
|
162 |
|
|
" .type __cxa_end_cleanup, \"function\"\n"
|
163 |
|
|
"__cxa_end_cleanup:\n"
|
164 |
|
|
" stw .d2t2 B9, *B15--[10]\n"
|
165 |
|
|
" stw .d2t2 B8, *+B15[9]\n"
|
166 |
|
|
" stw .d2t2 B7, *+B15[8]\n"
|
167 |
|
|
" stw .d2t2 B6, *+B15[7]\n"
|
168 |
|
|
" stw .d2t2 B5, *+B15[6]\n"
|
169 |
|
|
" stw .d2t2 B4, *+B15[5]\n"
|
170 |
|
|
" stw .d2t1 A9, *+B15[4]\n"
|
171 |
|
|
" stw .d2t1 A8, *+B15[3]\n"
|
172 |
|
|
" stw .d2t1 A7, *+B15[2]\n"
|
173 |
|
|
" stw .d2t1 A6, *+B15[1]\n"
|
174 |
|
|
#ifdef _TMS320C6400_PLUS
|
175 |
|
|
" callp .s2 (__gnu_end_cleanup), B3\n"
|
176 |
|
|
#elif defined(_TMS320C6400)
|
177 |
|
|
" call .s2 (__gnu_end_cleanup)\n"
|
178 |
|
|
" addkpc .s2 1f, B3, 0\n"
|
179 |
|
|
" nop 4\n"
|
180 |
|
|
"1:\n"
|
181 |
|
|
#else
|
182 |
|
|
" call .s2 (__gnu_end_cleanup)\n"
|
183 |
|
|
" mvkl .s2 1f, B3\n"
|
184 |
|
|
" mvkh .s2 1f, B3\n"
|
185 |
|
|
" nop 3\n"
|
186 |
|
|
"1:\n"
|
187 |
|
|
#endif
|
188 |
|
|
" ldw .d2t1 *+B15[1], A6\n"
|
189 |
|
|
" ldw .d2t1 *+B15[2], A7\n"
|
190 |
|
|
" ldw .d2t1 *+B15[3], A8\n"
|
191 |
|
|
" ldw .d2t1 *+B15[4], A9\n"
|
192 |
|
|
" ldw .d2t2 *+B15[5], B4\n"
|
193 |
|
|
" ldw .d2t2 *+B15[6], B5\n"
|
194 |
|
|
" ldw .d2t2 *+B15[7], B6\n"
|
195 |
|
|
" ldw .d2t2 *+B15[8], B7\n"
|
196 |
|
|
" ldw .d2t2 *+B15[9], B8\n"
|
197 |
|
|
" ldw .d2t2 *++B15[10], B9\n"
|
198 |
|
|
" b .s2 _Unwind_Resume\n"
|
199 |
|
|
" nop 5\n");
|
200 |
|
|
#else
|
201 |
|
|
// Assembly wrapper to call __gnu_end_cleanup without clobbering r1-r3.
|
202 |
|
|
// Also push r4 to preserve stack alignment.
|
203 |
|
|
#ifdef __thumb__
|
204 |
|
|
asm (" .pushsection .text.__cxa_end_cleanup\n"
|
205 |
|
|
" .global __cxa_end_cleanup\n"
|
206 |
|
|
" .type __cxa_end_cleanup, \"function\"\n"
|
207 |
|
|
" .thumb_func\n"
|
208 |
|
|
"__cxa_end_cleanup:\n"
|
209 |
|
|
" push\t{r1, r2, r3, r4}\n"
|
210 |
|
|
" bl\t__gnu_end_cleanup\n"
|
211 |
|
|
" pop\t{r1, r2, r3, r4}\n"
|
212 |
|
|
" bl\t_Unwind_Resume @ Never returns\n"
|
213 |
|
|
" .popsection\n");
|
214 |
|
|
#else
|
215 |
|
|
asm (" .pushsection .text.__cxa_end_cleanup\n"
|
216 |
|
|
" .global __cxa_end_cleanup\n"
|
217 |
|
|
" .type __cxa_end_cleanup, \"function\"\n"
|
218 |
|
|
"__cxa_end_cleanup:\n"
|
219 |
|
|
" stmfd\tsp!, {r1, r2, r3, r4}\n"
|
220 |
|
|
" bl\t__gnu_end_cleanup\n"
|
221 |
|
|
" ldmfd\tsp!, {r1, r2, r3, r4}\n"
|
222 |
|
|
" bl\t_Unwind_Resume @ Never returns\n"
|
223 |
|
|
" .popsection\n");
|
224 |
|
|
#endif
|
225 |
|
|
#endif
|
226 |
|
|
|
227 |
|
|
#endif
|