reactos/lib/pseh/framebased.c

   1 #define STRICT
   2 #define WIN32_LEAN_AND_MEAN
   3 #include <windows.h>
   4
   5 #include <pseh/framebased/internal.h>
   6 #include <excpt.h>
   7
   8 /* Assembly helpers, see i386/framebased.asm */
   9 extern void __cdecl _SEHCleanHandlerEnvironment(void);
  10 extern void __cdecl _SEHRegisterFrame(_SEHRegistration_t *);
  11 extern void __cdecl _SEHUnregisterFrame(const _SEHRegistration_t *);
  12 extern void __cdecl _SEHUnwind(_SEHPortableFrame_t *);
  13
  14 __declspec(noreturn) void __cdecl _SEHCallHandler(_SEHPortableFrame_t * frame)
  15 {
  16  frame->SPF_Handling = 1;
  17  _SEHUnwind(frame);
  18  frame->SPF_Handlers->SH_Handler(frame);
  19 }
  20
  21 int __cdecl _SEHFrameHandler
  22 (
  23  struct _EXCEPTION_RECORD * ExceptionRecord,
  24  void * EstablisherFrame,
  25  struct _CONTEXT * ContextRecord,
  26  void * DispatcherContext
  27 )
  28 {
  29  _SEHPortableFrame_t * frame;
  30
  31  _SEHCleanHandlerEnvironment();
  32
  33  frame = EstablisherFrame;
  34
  35  /* Unwinding */
  36  if(ExceptionRecord->ExceptionFlags & (4 | 2))
  37  {
  38   if(frame->SPF_Handlers->SH_Finally && !frame->SPF_Handling)
  39    frame->SPF_Handlers->SH_Finally(frame);
  40  }
  41  /* Handling */
  42  else
  43  {
  44   if(ExceptionRecord->ExceptionCode)
  45    frame->SPF_Code = ExceptionRecord->ExceptionCode;
  46   else
  47    frame->SPF_Code = 0xC0000001;
  48
  49   if(frame->SPF_Handlers->SH_Filter)
  50   {
  51    int ret;
  52
  53    switch((UINT_PTR)frame->SPF_Handlers->SH_Filter)
  54    {
  55     case EXCEPTION_EXECUTE_HANDLER + 1:
  56     case EXCEPTION_CONTINUE_SEARCH + 1:
  57     case EXCEPTION_CONTINUE_EXECUTION + 1:
  58     {
  59      ret = (int)((UINT_PTR)frame->SPF_Handlers->SH_Filter) - 1;
  60      break;
  61     }
  62
  63     default:
  64     {
  65      EXCEPTION_POINTERS ep;
  66
  67      ep.ExceptionRecord = ExceptionRecord;
  68      ep.ContextRecord = ContextRecord;
  69
  70      ret = frame->SPF_Handlers->SH_Filter(&ep, frame);
  71      break;
  72     }
  73    }
  74
  75    /* EXCEPTION_CONTINUE_EXECUTION */
  76    if(ret < 0)
  77     return ExceptionContinueExecution;
  78    /* EXCEPTION_EXECUTE_HANDLER */
  79    else if(ret > 0)
  80     _SEHCallHandler(frame);
  81    /* EXCEPTION_CONTINUE_SEARCH */
  82    else
  83     /* fall through */;
  84   }
  85  }
  86
  87  return ExceptionContinueSearch;
  88 }
  89
  90 void __stdcall _SEHEnter(_SEHPortableFrame_t * frame)
  91 {
  92  frame->SPF_Registration.SER_Handler = _SEHFrameHandler;
  93  frame->SPF_Code = 0;
  94  frame->SPF_Handling = 0;
  95  _SEHRegisterFrame(&frame->SPF_Registration);
  96 }
  97
  98 void __stdcall _SEHLeave(_SEHPortableFrame_t * frame)
  99 {
 100  _SEHUnregisterFrame(&frame->SPF_Registration);
 101 }
 102
 103 /* EOF */