Exercise 2 [Arithmetic Operations Consider the following assembly code for a fun

Question

Exercise 2 [Arithmetic Operations Consider the following assembly code for a function F2 with three integer arguments F1: push EBP mov EBP, ESP # setup stack mov ECX, DWORD PTR [ebp+16] mov EDX, DWORD PTR [ebp+12] mov EAX, DWORD PTR [ebp+8] add EAX, EDX #EAX #EAX #EAX # ignore for now # cleanup stack sal EAX, 2 sub EAX , ECX mov DWORD PTR [ebp-4], EAX mov ESP, EBP pop EBP ret To the right of each instruction, show the contents of the register whose value changes as a result of executing that instruction, then fill in the blanks in the corresponding C source code below. int F2 (int x, int y, int z) int result; result return result;

Explanation / Answer

Answer:

Result = (x+y)/4 - z;

Explanation:

EAX contains x; EDX contains y; EXC contains z;

For the instruction

Add EAX, EDX; x = x+y

Sal EAX, 2; x= (x+y)/4

Sub EAX, ECX = (x+y)/4 - z

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