CHAPTER 68. WINDOWS NT CHAPTER 68. WINDOWS NT
_main ENDP
Listing 68.11: MSVC 2012: two try blocks example$SG85486 DB 'in filter. code=0x%08X', 0aH, 00H
$SG85488 DB 'yes, that is our exception', 0aH, 00H
$SG85490 DB 'not our exception', 0aH, 00H
$SG85497 DB 'hello!', 0aH, 00H
$SG85499 DB '0x112233 raised. now let''s crash', 0aH, 00H
$SG85501 DB 'access violation, can''t recover', 0aH, 00H
$SG85503 DB 'user exception caught', 0aH, 00H
xdata$x SEGMENT
__sehtable$_main DD 0fffffffeH ; GS Cookie Offset
DD 00H ; GS Cookie XOR Offset
DD 0ffffffc8H ; EH Cookie Offset
DD 00H ; EH Cookie Offset
DD 0fffffffeH ; previous try level for outer block
DD FLAT:$LN19@main ; outer block filter
DD FLAT:$LN9@main ; outer block handler
DD 00H ; previous try level for inner block
DD FLAT:$LN18@main ; inner block filter
DD FLAT:$LN13@main ; inner block handler
xdata$x ENDS
$T2 = -40 ; size = 4
$T3 = -36 ; size = 4
_p$ = -32 ; size = 4
tv72 = -28 ; size = 4
$SEHRec$ = -24 ; size = 24
_main PROC
push ebp
mov ebp, esp
push -2 ; initial previous try level
push OFFSET __sehtable$_main
push OFFSET except_handler4
mov eax, DWORD PTR fs:0
push eax ; prev
add esp, -24
push ebx
push esi
push edi
mov eax, DWORD PTR _security_cookie
xor DWORD PTR $SEHRec$[ebp+16], eax ; xored pointer to scope table
xor eax, ebp ; ebp ^ security_cookie
push eax
lea eax, DWORD PTR $SEHRec$[ebp+8] ; pointer to⤦
ÇVC_EXCEPTION_REGISTRATION_RECORD
mov DWORD PTR fs:0, eax
mov DWORD PTR __$SEHRec$[ebp], esp
mov DWORD PTR _p$[ebp], 0
mov DWORD PTR $SEHRec$[ebp+20], 0 ; entering outer try block, setting previous try⤦
Çlevel=0
mov DWORD PTR __$SEHRec$[ebp+20], 1 ; entering inner try block, setting previous try⤦
Çlevel=1
push OFFSET $SG85497 ; 'hello!'
call _printf
add esp, 4
push 0
push 0
push 0
push 1122867 ; 00112233H
call DWORD PTR impRaiseException@16
push OFFSET $SG85499 ; '0x112233 raised. now let''s crash'
call _printf
add esp, 4
mov eax, DWORD PTR _p$[ebp]
mov DWORD PTR [eax], 13
mov DWORD PTR __$SEHRec$[ebp+20], 0 ; exiting inner try block, set previous try level⤦
Çback to 0