Question

Use the following data declarations. Assume that the offset of byteVal is 00000000: data byteValsbyte 1,2,3,ffh dwordVal dword 34567890h, 90785634h, 12346745h Show the value of the final destination operand after each of the following code fragments has executed:(If any instruction/s is invalid, indicate "INV" as the answer and briefly explain why) a.mov edi, 2 answer al mov al, (byte Val + edi) b.mov ebx, dwordVal+4 answer ebx - [esi).- (show your answer in liteedim mov esi, offset dwordVal+8 xchg ebx, (esi) c.movsx cx, byte Val+3 answer (show your answer in biary) CI- answer ear- bl- d. mor eax, word ptr (dwordVal+7] mov bl, byte ptr (dwordVal +10] answer OF SF- e.mov al, Oh signed number add al, 40h sed number

Answer 1

Solution data byteval sbyte 1,2,3 ,ffb dwordVal dword 34567890 h , 90785634h, 12346745h address : 01 02 03 ff 90/78 56 34 34 56 7890145167341 12 00 01 02 03 04 OS 06 07 08 09 OA OB OC OD OE OF 1. byteval dword Val mov edi, 2 mov al, [ byteval + edi ) # edi = 2 al Coo+02] # [02] al - 03 Ansi b # 08 mov ebx, dword Val +4 mou esi, offset cword Val +8 xchg ebx, [esi] ebx = esia Cesi C ( 0000 0008) 16 C0000000 C) 16 0000000C ( exchange.) # e mou al , son add al, 405 1000 0000 +0100 0000 I 100 0000 Overflow frog = 0 sign flag = 1 d mou eax, word pto [ cccord Val +7] eax - C00004590) 04+07 = (OB mov bl, byte pto [ dwordval + 10 # 04+10= OE bl= 34