If a procedure has no LOCAL, it will not restore the stack from EBP.
Example of procedure with LOCAL
TESTPROC proc
LOCAL Dummy:DWORD
XOR EAX,EAX
ret
TESTPROC endp
PUSH EBP
MOV EBP,ESP
ADD ESP,-4
XOR EAX,EAX
MOV ESP,EBP
POP EBP
RETN 4
Removing LOCAL Dummy:DWORD would also make the procedure uses no MOV ESP,EBP before RET.
PUSH EBP
MOV EBP,ESP
XOR EAX,EAX
POP EBP
RETN 4
Is this the expected behavior or this is a bug?