Assembly Instructions
MOV
- mov eax, ESP ; Move stack pointer to eax
- mov ebx, [ESP] ; Move value at top-of-stack to ebx ( memory content moved
- .DATA
array DD 20 DUP (0) ; Array of 20 integers initialized to zero
.CODE
mov ecx, OFFSET array ; Move starting address of 'array' to ecx. OFFSET is used to move addresses not memory content - mov ecx, array ; copy the first element of the array into ecx. ( memory content moved )
- mov ecx, 20[ebp] ;copy the element at [ebp+20] into ecx ( memory content moved )
- mov eax, table[ESI*4] ; copy element at [ OFFSET table + esi * 4] into eax ( memory content moved )
- mov ecx, DWORD PTR ?myArray@@3PAHA[eax] ; move a DWORD element from myArray@@3PAHA position EAX into ECX. myArray@@3PAHA is a pointer to the segment area (memory) where myArray lives. ( memory content moved )
PTR gives size directives to the instruction.
LEA (Load Effective address)
- lea edi, DWORD PTR [ebp-192] ; copy [ebp-192] address into o edi
ADD
- add eax,[DI + 20 ] ; eax = eax + memory [ DI +20 ] ( memory content moved )
- add BYTE PTR [var], 10 ; add 10 to the single byt eax = eax + memory [ DI +20 ] ( memory content moved )
