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/*
* 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 */
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