@TRY_BEGIN MACRO Handler 
  pushad
mov
push
push
mov 
esi, offset Handler
esi
dword ptr fs:[0]
dword ptr fs:[0], esp ;;Save Current State
;;Address of New Exception Handler
;;Save Old Exception Handler
;;Install New Handler 
ENDM       
        
@TRY_EXCEPT MACRO Handler 

Handler: jmp
mov
pop
add
popad NoException&Handler
esp, [esp + 8]
dword ptr fs:[0]
esp, 4 ;;No Exception Occured, so jump over
;;Exception Occured, Get old ESP
;;Restore Old Exception Handler
;;ESP value before SEH was set
;;Restore Old State 
ENDM       
        
@TRY_END MACRO Handler 

NoException&Handler:


ExceptionHandled&Handler: jmp

pop
add
 ExceptionHandled&Handler

dword ptr fs:[0]
esp, 32 + 4
 ;;Exception was handled by @TRY_EXCEPT
;;No Exception Occured
;;Restore Old Exception Handler
;;ESP value before SEH was set. 32 for pushad and ...
;;...4 for push offset Handler. (No Restore State)
;;Exception has been handled, or no exception occured 
ENDM 


@TRY_BEGIN Name_Of_Handler 
  ;<This code will be checked for exceptions> 
@TRY_EXCEPT Name_Of_Handler 
  ;<This code will be executed if an exception occurs> 
@TRY_END Name_Of_Handler 
  ;<Normal Execution Path> 


;Structured Exception Handling in Assembly
;(c) 2000, Rohitab Batra
;software@rohitab.com
;This Code was downloaded from http://www.rohitab.com/
;
;To Compile this program, you need the 32-bit version of Turbo Assembler
;
;TASM32 /ml SEH
;TLINK32 SEH,SEH,,IMPORT32.LIB

.386p
.model flat ,stdcall

EXTRN ExitProcess:PROC
EXTRN MessageBoxA:PROC


;Define the @TRY_BEGIN, @TRY_EXCEPT and @TRY_END Macros Here 
.data
 
  szCaption
szException

szNoException db
db
db
db 'SEH in Assembly', 0
'Exception has been handled !!', 0dh, 0ah
'Press OK to terminate gracefully', 0
'No Exception occured', 0 
.code

WinMain:


@TRY_BEGIN Zero_Address_Access
 
  mov
mov
 ebx, 0
[ebx], ebx
 ;Prepare to write to address 0
;Write to address 0 (Access Violation)
;Comment the above line if to remove the exception 
@TRY_EXCEPT Zero_Address_Access 
  ;This code will get executed if an exception occurs 
  call
jmp MessageBoxA, 0, offset szException, offset szCaption, 0
ExitProgram 
@TRY_END Zero_Address_Access 
  ;Normal execution path 
ExitProgram: 
call 
MessageBoxA, 0, offset szNoException, offset szCaption, 0 
  call ExitProcess, 0 ;Terminate 
END WinMain