2 Copyright (c) 2008 KJK::Hyperion
4 Permission is hereby granted, free of charge, to any person obtaining a
5 copy of this software and associated documentation files (the "Software"),
6 to deal in the Software without restriction, including without limitation
7 the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 and/or sell copies of the Software, and to permit persons to whom the
9 Software is furnished to do so, subject to the following conditions:
11 The above copyright notice and this permission notice shall be included in
12 all copies or substantial portions of the Software.
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 DEALINGS IN THE SOFTWARE.
23 #define _NTSYSTEM_ /* removes dllimport attribute from RtlUnwind */
26 #define WIN32_LEAN_AND_MEAN
29 #include <pseh/pseh2.h>
33 #ifndef EXCEPTION_EXIT_UNWIND
34 #define EXCEPTION_EXIT_UNWIND 4
37 #ifndef EXCEPTION_UNWINDING
38 #define EXCEPTION_UNWINDING 2
41 extern DECLSPEC_NORETURN
int __SEH2Handle(void *, void *, void *, void *, void *, void *);
42 extern int __cdecl
__SEH2FrameHandler(struct _EXCEPTION_RECORD
*, void *, struct _CONTEXT
*, void *);
43 extern int __cdecl
__SEH2UnwindHandler(struct _EXCEPTION_RECORD
*, void *, struct _CONTEXT
*, void *);
45 typedef struct __SEHTrampoline
47 unsigned char STR_MovEcx
;
48 unsigned char * STR_Closure
;
49 unsigned char STR_Jmp
;
50 unsigned char * STR_Function
;
52 __attribute__((packed
))
56 int _SEHIsTrampoline(_SEHTrampoline_t
* trampoline_
)
58 return trampoline_
->STR_MovEcx
== 0xb9 && trampoline_
->STR_Jmp
== 0xe9;
62 void * _SEHFunctionFromTrampoline(_SEHTrampoline_t
* trampoline_
)
64 return (int)(trampoline_
+ 1) + trampoline_
->STR_Function
;
68 void * _SEHClosureFromTrampoline(_SEHTrampoline_t
* trampoline_
)
70 return trampoline_
->STR_Closure
;
74 _SEH2Registration_t
* __cdecl
_SEH2CurrentRegistration(void)
76 return (_SEH2Registration_t
*)__readfsdword(0);
80 void __cdecl
__SEH2EnterFrame(_SEH2Registration_t
* frame
)
82 frame
->SER_Prev
= _SEH2CurrentRegistration();
83 __writefsdword(0, (unsigned long)frame
);
87 void __cdecl
__SEH2LeaveFrame(void)
89 __writefsdword(0, (unsigned long)_SEH2CurrentRegistration()->SER_Prev
);
93 void _SEH2GlobalUnwind(void * target
)
102 "call %c[RtlUnwind]\n"
103 "Return%=: pop %%ebp\n" :
105 [target
] "g" (target
), [RtlUnwind
] "g" (&RtlUnwind
) :
106 "eax", "ebx", "ecx", "edx", "esi", "edi", "flags", "memory"
111 __SEH_EXCEPT_RET
_SEH2Except(_SEH2Frame_t
* frame
, volatile _SEH2TryLevel_t
* trylevel
, struct _EXCEPTION_POINTERS
* ep
)
113 void * filter
= trylevel
->ST_Filter
;
114 void * context
= NULL
;
115 __SEH_EXCEPT_RET ret
;
117 if(filter
== (void *)0)
120 if(filter
== (void *)1)
123 if(filter
== (void *)-1)
126 if(_SEHIsTrampoline((_SEHTrampoline_t
*)filter
))
128 context
= _SEHClosureFromTrampoline((_SEHTrampoline_t
*)filter
);
129 filter
= _SEHFunctionFromTrampoline((_SEHTrampoline_t
*)filter
);
140 "c" (context
), [filter
] "r" (filter
), [frame
] "g" (frame
), [ep
] "g" (ep
) :
141 "edx", "flags", "memory"
148 void _SEH2Finally(_SEH2Frame_t
* frame
, volatile _SEH2TryLevel_t
* trylevel
)
150 if(trylevel
->ST_Filter
== NULL
&& trylevel
->ST_Body
!= NULL
)
152 void * body
= trylevel
->ST_Body
;
153 void * context
= NULL
;
155 if(_SEHIsTrampoline((_SEHTrampoline_t
*)body
))
157 context
= _SEHClosureFromTrampoline((_SEHTrampoline_t
*)body
);
158 body
= _SEHFunctionFromTrampoline((_SEHTrampoline_t
*)body
);
161 __asm__
__volatile__("call *%1\n" : : "c" (context
), "r" (body
) : "eax", "edx", "flags", "memory");
165 typedef struct __SEH2UnwindFrame
167 _SEH2Registration_t SUF_Registration
;
168 _SEH2Frame_t
* SUF_Frame
;
169 volatile _SEH2TryLevel_t
* SUF_TargetTryLevel
;
173 static void _SEH2LocalUnwind(_SEH2Frame_t
*, volatile _SEH2TryLevel_t
*);
176 int __cdecl _SEH2UnwindHandler
178 struct _EXCEPTION_RECORD
* ExceptionRecord
,
179 void * EstablisherFrame
,
180 struct _CONTEXT
* ContextRecord
,
181 void * DispatcherContext
184 if(ExceptionRecord
->ExceptionFlags
& (EXCEPTION_EXIT_UNWIND
| EXCEPTION_UNWINDING
))
186 _SEH2UnwindFrame_t
* unwindframe
= CONTAINING_RECORD(EstablisherFrame
, _SEH2UnwindFrame_t
, SUF_Registration
);
187 _SEH2LocalUnwind(unwindframe
->SUF_Frame
, unwindframe
->SUF_TargetTryLevel
);
188 *((void **)DispatcherContext
) = EstablisherFrame
;
189 return ExceptionCollidedUnwind
;
192 return ExceptionContinueSearch
;
196 void _SEH2LocalUnwind(_SEH2Frame_t
* frame
, volatile _SEH2TryLevel_t
* dsttrylevel
)
198 volatile _SEH2TryLevel_t
* trylevel
;
199 _SEH2UnwindFrame_t unwindframe
;
201 unwindframe
.SUF_Frame
= frame
;
202 unwindframe
.SUF_TargetTryLevel
= dsttrylevel
;
204 unwindframe
.SUF_Registration
.SER_Handler
= &__SEH2UnwindHandler
;
205 __SEH2EnterFrame(&unwindframe
.SUF_Registration
);
207 for(trylevel
= frame
->SF_TopTryLevel
; trylevel
&& trylevel
!= dsttrylevel
; trylevel
= trylevel
->ST_Next
)
209 frame
->SF_TopTryLevel
= trylevel
->ST_Next
;
210 _SEH2Finally(frame
, trylevel
);
216 static DECLSPEC_NORETURN
217 void _SEH2Handle(_SEH2Frame_t
* frame
, volatile _SEH2TryLevel_t
* trylevel
)
219 volatile _SEH2HandleTryLevel_t
* fulltrylevel
= CONTAINING_RECORD(trylevel
, _SEH2HandleTryLevel_t
, SHT_Common
);
221 _SEH2GlobalUnwind(frame
);
222 _SEH2LocalUnwind(frame
, &fulltrylevel
->SHT_Common
);
223 frame
->SF_TopTryLevel
= fulltrylevel
->SHT_Common
.ST_Next
;
227 fulltrylevel
->SHT_Common
.ST_Body
,
228 fulltrylevel
->SHT_Esp
,
229 fulltrylevel
->SHT_Ebp
,
230 fulltrylevel
->SHT_Ebx
,
231 fulltrylevel
->SHT_Esi
,
232 fulltrylevel
->SHT_Edi
237 int __cdecl _SEH2FrameHandler
239 struct _EXCEPTION_RECORD
* ExceptionRecord
,
240 void * EstablisherFrame
,
241 struct _CONTEXT
* ContextRecord
,
242 void * DispatcherContext
245 _SEH2Frame_t
* frame
;
247 frame
= EstablisherFrame
;
250 if(ExceptionRecord
->ExceptionFlags
& (EXCEPTION_EXIT_UNWIND
| EXCEPTION_UNWINDING
))
252 _SEH2LocalUnwind(frame
, NULL
);
258 volatile _SEH2TryLevel_t
* trylevel
;
259 EXCEPTION_POINTERS ep
;
261 ep
.ExceptionRecord
= ExceptionRecord
;
262 ep
.ContextRecord
= ContextRecord
;
264 frame
->SF_Code
= ExceptionRecord
->ExceptionCode
;
266 for(trylevel
= frame
->SF_TopTryLevel
; trylevel
!= NULL
; trylevel
= trylevel
->ST_Next
)
268 ret
= _SEH2Except(frame
, trylevel
, &ep
);
271 return ExceptionContinueExecution
;
273 _SEH2Handle(frame
, trylevel
);
277 return ExceptionContinueSearch
;
281 void __cdecl
_SEH2EnterFrame(_SEH2Frame_t
* frame
)
283 frame
->SF_Registration
.SER_Handler
= __SEH2FrameHandler
;
285 __SEH2EnterFrame(&frame
->SF_Registration
);
289 int __cdecl
_SEH2EnterFrameAndTrylevel(_SEH2Frame_t
* frame
, volatile _SEH2TryLevel_t
* trylevel
)
291 frame
->SF_TopTryLevel
= trylevel
;
292 _SEH2EnterFrame(frame
);
297 void __cdecl
_SEH2LeaveFrame(void)
303 void __cdecl
_SEH2Return(void)
305 _SEH2LocalUnwind(CONTAINING_RECORD(_SEH2CurrentRegistration(), _SEH2Frame_t
, SF_Registration
), NULL
);