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hying的单步陷阱
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发表于:
2004-6-2 18:55
7495
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Opcode很乱,具体我也不清楚,但可以用
.586P
.Model Flat,StdCall
Option CaseMap:None
Assume Fs:Nothing
.Code
Start:
call _push_handler
mov eax, [esp+4]
mov eax, [eax]
cmp eax, 80000004h
jnz short _live_or_dead+1 ; to see my god...
mov esp, [esp+8]
jmp short _restore_stack
_junk_1:
pop eax
_live_or_dead:
jmp short _trap_end
db 0E9h
_restore_stack:
pop fs:0
jz short _junk_1
jnz short _junk_1
_trap_end:
jmp short _out
_push_handler:
push fs:0
jmp short _set_seh_1
db 0FFh
_make_exception:
pushf
jz short _junk_2
jnz short _junk_2
_bad_address:
db 0E9h
_junk_2:
or dword ptr [esp], 100h
popf
nop
jmp short _bad_address
_set_seh_1:
mov fs:0, esp
jmp short _make_exception
_out:
ret
End Start
宏,随便放
_Trap MACRO Junkcode
LOCAL _push_handler, _live_or_dead, _restore_stack, _junk_1,_junk_2,_trap_end, _make_exception, _bad_address,_set_seh_1,_out
call _push_handler
mov eax, [esp+4]
mov eax, [eax]
cmp eax, 80000004h
jnz short _live_or_dead+1 ; skip
mov esp, [esp+8]
jmp short _restore_stack
_junk_1:
pop eax
_live_or_dead:
jmp short _trap_end
db 0E9h ; jmp ->
_restore_stack:
pop fs:0
jz short _junk_1
jnz short _junk_1
_trap_end:
jmp short _out
_push_handler:
push fs:0
jmp short _set_seh_1
db Junkcode
_make_exception:
pushfd
jz short _junk_2
jnz short _junk_2
_bad_address:
db 0E9h
_junk_2:
or dword ptr [esp], 100h
popfd
nop
jmp short _bad_address
_set_seh_1:
mov fs:0, esp
jmp short _make_exception
_out:
ret
ENDM
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