reactos/w32api/include/crt/excpt.h

   1 /*
   2  * excpt.h
   3  * This file has no copyright assigned and is placed in the Public Domain.
   4  * This file is a part of the mingw-runtime package.
   5  * No warranty is given; refer to the file DISCLAIMER within the package.
   6  *
   7  * Support for operating system level structured exception handling.
   8  *
   9  * NOTE: This is very preliminary stuff. I am also pretty sure it is
  10  *       completely Intel specific.
  11  *
  12  */
  13
  14 #ifndef _EXCPT_H_
  15 #define _EXCPT_H_
  16
  17 /* All the headers include this file. */
  18 #if defined(__MINGW32__)
  19 #include <_mingw.h>
  20 #endif
  21
  22 #include <windef.h>
  23
  24 /*
  25  * NOTE: The constants structs and typedefs below should be defined in the
  26  *       Win32 API headers.
  27  */
  28 #define EH_NONCONTINUABLE       0x01
  29 #define EH_UNWINDING            0x02
  30 #define EH_EXIT_UNWIND          0x04
  31 #define EH_STACK_INVALID        0x08
  32 #define EH_NESTED_CALL          0x10
  33
  34 #ifndef RC_INVOKED
  35
  36 typedef enum {
  37         ExceptionContinueExecution,
  38         ExceptionContinueSearch,
  39         ExceptionNestedException,
  40         ExceptionCollidedUnwind
  41 } EXCEPTION_DISPOSITION;
  42
  43
  44 /*
  45  * End of stuff that should be in the Win32 API files.
  46  */
  47
  48
  49 #ifdef  __cplusplus
  50 extern "C" {
  51 #endif
  52
  53 /*
  54  * The type of function that is expected as an exception handler to be
  55  * installed with _try1.
  56  */
  57 typedef EXCEPTION_DISPOSITION (*PEXCEPTION_HANDLER)
  58                 (struct _EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
  59
  60
  61 /*
  62  * A macro which installs the supplied exception handler.
  63  * Push the pointer to the new handler onto the stack,
  64  * then push the pointer to the old registration structure (at fs:0)
  65  * onto the stack, then put a pointer to the new registration
  66  * structure (i.e. the current stack pointer) at fs:0.
  67  */
  68 #define __try1(pHandler) \
  69         __asm__ ("pushl %0;pushl %%fs:0;movl %%esp,%%fs:0;" : : "g" (pHandler));
  70
  71 /*
  72  * A macro which (despite its name) *removes* an installed
  73  * exception handler. Should be used only in conjunction with the above
  74  * install routine __try1.
  75  * Move the pointer to the old reg. struct (at the current stack
  76  * position) to fs:0, replacing the pointer we installed above,
  77  * then add 8 to the stack pointer to get rid of the space we
  78  * used when we pushed on our new reg. struct above. Notice that
  79  * the stack must be in the exact state at this point that it was
  80  * after we did _try1 or this will smash things.
  81  */
  82 #define __except1       \
  83         __asm__ ("movl (%%esp),%%eax;movl %%eax,%%fs:0;addl $8,%%esp;" \
  84          : : : "%eax");
  85
  86 #ifdef  __cplusplus
  87 }
  88 #endif
  89
  90 #endif  /* Not RC_INVOKED */
  91
  92 #endif  /* _EXCPT_H_ not defined */