reactos/include/excpt.h

   1 /*
   2  * excpt.h
   3  *
   4  * Support for operating system level structured exception handling.
   5  *
   6  * NOTE: This is very preliminary stuff. I am also pretty sure it is
   7  *       completely Intel specific.
   8  *
   9  * This file is part of the Mingw32 package.
  10  *
  11  * Contributors:
  12  *  Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
  13  *  Based on code by Mikey <jeffdb@netzone.com>
  14  *
  15  *  THIS SOFTWARE IS NOT COPYRIGHTED
  16  *
  17  *  This source code is offered for use in the public domain. You may
  18  *  use, modify or distribute it freely.
  19  *
  20  *  This code is distributed in the hope that it will be useful but
  21  *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  22  *  DISCLAIMED. This includes but is not limited to warranties of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  24  *
  25  * $Revision: 1.4 $
  26  * $Author$
  27  * $Date$
  28  *
  29  */
  30
  31 #ifndef _EXCPT_H_
  32 #define _EXCPT_H_
  33
  34 #ifndef __STRICT_ANSI__
  35
  36 #include <windows.h>
  37
  38 /*
  39  * NOTE: The constants structs and typedefs below should be defined in the
  40  *       Win32 API headers.
  41  */
  42 #define EH_NONCONTINUABLE       0x01
  43 #define EH_UNWINDING            0x02
  44 #define EH_EXIT_UNWIND          0x04
  45 #define EH_STACK_INVALID        0x08
  46 #define EH_NESTED_CALL          0x10
  47
  48 #ifndef RC_INVOKED
  49
  50 typedef enum {
  51         ExceptionContinueExecution,
  52         ExceptionContinueSearch,
  53         ExceptionNestedException,
  54         ExceptionCollidedUnwind
  55 } EXCEPTION_DISPOSITION;
  56
  57
  58 /*
  59  * End of stuff that should be in the Win32 API files.
  60  */
  61
  62
  63 #ifdef  __cplusplus
  64 extern "C" {
  65 #endif
  66
  67 /*
  68  * The type of function that is expected as an exception handler to be
  69  * installed with _try1.
  70  */
  71 typedef EXCEPTION_DISPOSITION (*PEXCEPTION_HANDLER)
  72                 (struct _EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
  73
  74 /*
  75  * This is not entirely necessary, but it is the structure installed by
  76  * the _try1 primitive below.
  77  */
  78 typedef struct _EXCEPTION_REGISTRATION
  79 {
  80         struct _EXCEPTION_REGISTRATION* prev;
  81         PEXCEPTION_HANDLER              handler;
  82 } EXCEPTION_REGISTRATION, *PEXCEPTION_REGISTRATION;
  83
  84 typedef EXCEPTION_REGISTRATION EXCEPTION_REGISTRATION_RECORD;
  85 typedef PEXCEPTION_REGISTRATION PEXCEPTION_REGISTRATION_RECORD;
  86
  87 /*
  88  * A macro which installs the supplied exception handler.
  89  * Push the pointer to the new handler onto the stack,
  90  * then push the pointer to the old registration structure (at fs:0)
  91  * onto the stack, then put a pointer to the new registration
  92  * structure (i.e. the current stack pointer) at fs:0.
  93  */
  94 #define __try1(pHandler) \
  95         __asm__ ("pushl %0;pushl %%fs:0;movl %%esp,%%fs:0;" : : "g" (pHandler));
  96
  97
  98 /*
  99  * A macro which (despite its name) *removes* an installed
 100  * exception handler. Should be used only in conjunction with the above
 101  * install routine __try1.
 102  * Move the pointer to the old reg. struct (at the current stack
 103  * position) to fs:0, replacing the pointer we installed above,
 104  * then add 8 to the stack pointer to get rid of the space we
 105  * used when we pushed on our new reg. struct above. Notice that
 106  * the stack must be in the exact state at this point that it was
 107  * after we did _try1 or this will smash things.
 108  */
 109 #define __except1       \
 110         __asm__ ("movl (%%esp),%%eax;movl %%eax,%%fs:0;addl $8,%%esp;" \
 111          : : : "%eax");
 112
 113 #ifdef  __cplusplus
 114 }
 115 #endif
 116
 117 #endif  /* Not RC_INVOKED */
 118
 119 #endif  /* Not strict ANSI */
 120
 121 #endif  /* _EXCPT_H_ not defined */