reactos/lib/pseh/framebased.c

   1 /*
   2  Copyright (c) 2004 KJK::Hyperion
   3
   4  Permission is hereby granted, free of charge, to any person obtaining a copy of
   5  this software and associated documentation files (the "Software"), to deal in
   6  the Software without restriction, including without limitation the rights to
   7  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   8  of the Software, and to permit persons to whom the Software is furnished to do
   9  so, subject to the following conditions:
  10
  11  The above copyright notice and this permission notice shall be included in all
  12  copies or substantial portions of the Software.
  13
  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 FROM,
  19  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  SOFTWARE.
  21 */
  22
  23 #define STRICT
  24 #define WIN32_LEAN_AND_MEAN
  25 #include <windows.h>
  26
  27 #include <pseh/framebased/internal.h>
  28 #include <excpt.h>
  29
  30 /* Assembly helpers, see i386/framebased.asm */
  31 extern void __cdecl _SEHCleanHandlerEnvironment(void);
  32 extern void __cdecl _SEHRegisterFrame(_SEHRegistration_t *);
  33 extern void __cdecl _SEHUnregisterFrame(const _SEHRegistration_t *);
  34 extern void __cdecl _SEHUnwind(_SEHPortableFrame_t *);
  35
  36 __declspec(noreturn) void __cdecl _SEHCallHandler(_SEHPortableFrame_t * frame)
  37 {
  38  frame->SPF_Handling = 1;
  39  _SEHUnwind(frame);
  40  frame->SPF_Handlers->SH_Handler(frame);
  41 }
  42
  43 int __cdecl _SEHFrameHandler
  44 (
  45  struct _EXCEPTION_RECORD * ExceptionRecord,
  46  void * EstablisherFrame,
  47  struct _CONTEXT * ContextRecord,
  48  void * DispatcherContext
  49 )
  50 {
  51  _SEHPortableFrame_t * frame;
  52
  53  _SEHCleanHandlerEnvironment();
  54
  55  frame = EstablisherFrame;
  56
  57  /* Unwinding */
  58  if(ExceptionRecord->ExceptionFlags & (4 | 2))
  59  {
  60   if(frame->SPF_Handlers->SH_Finally && !frame->SPF_Handling)
  61    frame->SPF_Handlers->SH_Finally(frame);
  62  }
  63  /* Handling */
  64  else
  65  {
  66   if(ExceptionRecord->ExceptionCode)
  67    frame->SPF_Code = ExceptionRecord->ExceptionCode;
  68   else
  69    frame->SPF_Code = 0xC0000001;
  70
  71   if(frame->SPF_Handlers->SH_Filter)
  72   {
  73    int ret;
  74
  75    switch((UINT_PTR)frame->SPF_Handlers->SH_Filter)
  76    {
  77     case EXCEPTION_EXECUTE_HANDLER + 1:
  78     case EXCEPTION_CONTINUE_SEARCH + 1:
  79     case EXCEPTION_CONTINUE_EXECUTION + 1:
  80     {
  81      ret = (int)((UINT_PTR)frame->SPF_Handlers->SH_Filter) - 1;
  82      break;
  83     }
  84
  85     default:
  86     {
  87      EXCEPTION_POINTERS ep;
  88
  89      ep.ExceptionRecord = ExceptionRecord;
  90      ep.ContextRecord = ContextRecord;
  91
  92      ret = frame->SPF_Handlers->SH_Filter(&ep, frame);
  93      break;
  94     }
  95    }
  96
  97    /* EXCEPTION_CONTINUE_EXECUTION */
  98    if(ret < 0)
  99     return ExceptionContinueExecution;
 100    /* EXCEPTION_EXECUTE_HANDLER */
 101    else if(ret > 0)
 102     _SEHCallHandler(frame);
 103    /* EXCEPTION_CONTINUE_SEARCH */
 104    else
 105     /* fall through */;
 106   }
 107  }
 108
 109  return ExceptionContinueSearch;
 110 }
 111
 112 void __stdcall _SEHEnter(_SEHPortableFrame_t * frame)
 113 {
 114  frame->SPF_Registration.SER_Handler = _SEHFrameHandler;
 115  frame->SPF_Code = 0;
 116  frame->SPF_Handling = 0;
 117  _SEHRegisterFrame(&frame->SPF_Registration);
 118 }
 119
 120 void __stdcall _SEHLeave(_SEHPortableFrame_t * frame)
 121 {
 122  _SEHUnregisterFrame(&frame->SPF_Registration);
 123 }
 124
 125 /* EOF */