/* 

 * excpt.h

 * This file has no copyright assigned and is placed in the Public Domain.

 * This file is a part of the mingw-runtime package.

 * No warranty is given; refer to the file DISCLAIMER within the package.

 *

 * Support for operating system level structured exception handling.

 *

 * NOTE: This is very preliminary stuff. I am also pretty sure it is

 *       completely Intel specific.

 *

 */

#ifndef	_EXCPT_H_

#define	_EXCPT_H_

/* All the headers include this file. */

#include <_mingw.h>

#include <windef.h>

/*

 * NOTE: The constants structs and typedefs below should be defined in the

 *       Win32 API headers.

 */

#define	EH_NONCONTINUABLE	0x01

#define	EH_UNWINDING		0x02

#define	EH_EXIT_UNWIND		0x04

#define	EH_STACK_INVALID	0x08

#define	EH_NESTED_CALL		0x10

#ifndef	RC_INVOKED

typedef enum {

	ExceptionContinueExecution,

	ExceptionContinueSearch,

	ExceptionNestedException,

	ExceptionCollidedUnwind

} EXCEPTION_DISPOSITION;

/*

 * End of stuff that should be in the Win32 API files.

 */

#ifdef	__cplusplus

extern "C" {

#endif

/*

 * The type of function that is expected as an exception handler to be

 * installed with __try1.

 */

typedef EXCEPTION_DISPOSITION (*PEXCEPTION_HANDLER)

		(struct _EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);

/*

 * This is not entirely necessary, but it is the structure installed by

 * the __try1 primitive below.

 */

typedef struct _EXCEPTION_REGISTRATION

{

	struct _EXCEPTION_REGISTRATION*	prev;

	PEXCEPTION_HANDLER		handler;

} EXCEPTION_REGISTRATION, *PEXCEPTION_REGISTRATION;

typedef EXCEPTION_REGISTRATION EXCEPTION_REGISTRATION_RECORD;

typedef PEXCEPTION_REGISTRATION PEXCEPTION_REGISTRATION_RECORD;

/*

 * A macro which installs the supplied exception handler.

 * Push the pointer to the new handler onto the stack,

 * then push the pointer to the old registration structure (at fs:0)

 * onto the stack, then put a pointer to the new registration

 * structure (i.e. the current stack pointer) at fs:0.

 */

#define __try1(pHandler) \

	__asm__ ("pushl %0;pushl %%fs:0;movl %%esp,%%fs:0;" : : "g" (pHandler));

/*

 * A macro which (despite its name) *removes* an installed

 * exception handler. Should be used only in conjunction with the above

 * install routine __try1.

 * Move the pointer to the old reg. struct (at the current stack

 * position) to fs:0, replacing the pointer we installed above,

 * then add 8 to the stack pointer to get rid of the space we

 * used when we pushed on our new reg. struct above. Notice that

 * the stack must be in the exact state at this point that it was

 * after we did __try1 or this will smash things.

 */

#define	__except1	\

	__asm__ ("movl (%%esp),%%eax;movl %%eax,%%fs:0;addl $8,%%esp;" \

	 : : : "%eax");

#ifdef	__cplusplus

}

#endif

#endif	/* Not RC_INVOKED */

#endif	/* _EXCPT_H_ not defined */