4) C = 96 * B 5) 1 and 3 only 6) 2 and 4 only
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1 Instructions: The following questions use the AT&T (GNU) syntax for x86-32 assembly code, as in the course notes. Submit your answers to these questions to the Curator as OQ05 by the posted due date and time. No late submissions will be accepted. For questions 1 through 5, assume we have C code that gcc maps into registers as follows: variable A B C D register eax ebx ecx edx 1. Which C statement corresponds to the following assembly statement: movl %ecx, %eax 1) A = C 2) C = A 3) None of these 2. Which C statement corresponds to the following assembly statement: addl %ecx, %eax 1) A = A + C 2) C = A + C 3) None of these 3. Which C statement corresponds to the following assembly statement: subl %eax, %ecx 1) A = A - C 2) C = A - C 3) A = C - A 4) C = C - A 5) None of these 4. Which C statement corresponds to the following assembly statement: leal (%eax, %ebx, 4), %ebx 1) B = A + B + 4 2) C = (A + B) * 4 3) A = A + B * 4 4) C = B + A * 4 5) C = B + A << 4 6) C = (A + B) << 4 5. Which C statement corresponds to the following sequence of assembly statements: movl %ebx, %ecx addl %ecx, %ecx addl %ebx, %ecx sall %ecx, 5 1) C = 15 * B 2) C = (3 * B) << 5 3) C = (3 * B) * 5 4) C = 96 * B 6) 2 and 4 only 1
2 For questions 6 through 13, consider the following x86-32 assembly code file, which was produced by gcc from a short C function: Q6:... pushl %ebp # 1 movl %esp, %ebp # 2 subl $16, %esp # 3 movl $0, -4(%ebp) # 4 movl 8(%ebp), %eax # 5 imull 12(%ebp), %eax # 6 movl %eax, -4(%ebp) # 7 movl 16(%ebp), %eax # 8 addl %eax, -4(%ebp) # 9 movl -4(%ebp), %eax # 10 leave # 11 ret # Which lines of assembly code contain memory references to parameters being passed into the function? 1) 4 2) 5 3) 6 4) 7 5) 8 6) 9 7) 10 8) 5, 6 and 8 only 9) 4, 7, 9 and 10 only 7. Which lines of assembly code contain memory references to local automatic variables being used in the function? 1) 4 2) 5 3) 6 4) 7 5) 8 6) 9 7) 10 8) 5, 6 and 8 only 9) 4, 7, 9 and 10 only 8. What is the address of the first parameter (in the order they would be listed in the function declaration)? 9. What is the address of the first local automatic variable (closest to the beginning of the stack frame for the function)? 10. Which instruction(s) create the stack frame for the function? 4) 1, 2 and 3 only 5) 1 and 2 only 2
3 11. Which instruction(s) remove the stack frame for the function (not including the return-to address) from the stack? 4) 1 and 2 only 12. Which instruction(s) remove the return-to address from the stack? 4) 1 and 2 only 13. While the function is running, at what address is the return-to address stored on the stack? For questions 14 through 16, assume we have C code that gcc maps into registers as follows: register logical value eax A ebx B ecx &X edx &Y 14. To which C statement does the following assembly statement correspond: movl %eax, (%ecx) 1) X = A 2) A = X 3) *A = X 4) *X = A 5) A = &X 6) X = &A 15. To which C statement does the following assembly statement correspond: movl (%edx), %ebx 1) Y = B 2) B = Y 3) *B = Y 4) *Y = B 5) B = &Y 6) Y = &B 16. To which C statement does the following assembly statement correspond: movl %edx, %eax 1) A = &Y 2) Y = &A 3) *A = Y 4) *A = &Y 5) A = Y 6) Y = A 3
4 For questions 17 through 20, consider the following x86-32 assembly code file, which was produced by gcc from a short C function: Q17: pushl %ebp # 1 movl %esp, %ebp # 2 subl $16, %esp # 3 movl $0, -12(%ebp) # 4 movl $2, -8(%ebp) # 5 movl $4, -4(%ebp) # 6 movl 8(%ebp), %eax # 7 cmpl 12(%ebp), %eax # 8 jae.l2 # 9 movl 8(%ebp), %eax # 10 imull 12(%ebp), %eax # 11 movl %eax, -12(%ebp) # 12 movl 12(%ebp), %eax # 13 movl 8(%ebp), %edx # 14 leal (%edx,%eax), %eax # 15 movl %eax, -8(%ebp) # 16 movl -8(%ebp), %eax # 17 movl -12(%ebp), %edx # 18 leal (%edx,%eax), %eax # 19 movl %eax, -4(%ebp) # 20.L2: # 21 cmpl $16, -4(%ebp) # 22 jbe.l3 # 23 movl -4(%ebp), %eax # 24 shrl $3, %eax # 25 movl %eax, -4(%ebp) # 26 jmp.l4 # 27.L3: # 28 sall -4(%ebp) # 29.L4: # 30 movl -4(%ebp), %eax # 31 leave # 32 ret # 33 Assume the parameters to the function are named Param1, Param2, etc., and the local automatic variables are named Local1, Local2, etc. Assume that all the parameters and local automatic variables are of type unsigned int. 17. Which lines of the assembly program correspond to a C if-statement (without an else)? -3 2) 4-7 3) ) ) ) ) There is no if 18. Using the parameter/variable names given above, which of the following could be the test for the if-statement? 1) Param1 <= Param2 2) Param1 < Param2 3) Param1 >= Param2 4) Param1 > Param2 5) Local1 <= Local2 6) Local1 < Local2 7) Local1 >= Local2 8) Local1 > Local2 9) There is no if 4
5 19. Which lines of the assembly program correspond to a C if-else-statement? -3 2) 4-7 3) ) ) ) ) There is no if-else 20. Using the parameter/variable names given above, which of the following could be the test for the if-elsestatement? 1) Local1 <= 16 2) Local1 > 16 3) Local2 <= 16 4) Local2 > 16 5) Local3 <= 16 6) Local3 > 16 7) There is no if-else 5
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