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Which x86-64 register is the program counter?

Select one:

a. %rip

b. %rsp

c. %rsi

d. %rbp

e. %rax

Question 2

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Provide a matching between the mov instruction and the number of bytes of data that get moved.

movq

movw

movb

movl

Question 3

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Provide a matching between the C data type and the number of bytes allocated for that data type on an Intel x86-64 machine.

char

int

char *

short int

Question 4

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Provide a matching between the C data type and the number of bytes allocated for that data type on an Intel x86-64 machine.

long

unsigned short int

float

char

Question 5

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:
%rdx

Select one:

a. 0xAC

b. 0x10C

c. 0x25

d. 0x14

e. 0x104

f. 0x37

Question 6

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:

(%rdx)

Select one:

a. 0xAC

b. 0x25

c. 0x10C

d. 0x104

e. 0x14

f. 0x37

Question 7

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:
8(%rdx)

Select one:

a. 0x14

b. 0x104

c. 0x25

d. 0xAC

e. 0x37

f. 0x10C

Question 8

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:
$0x10C

Select one:

a. 0x10C

b. 0x14

c. 0x104

d. 0xAC

e. 0x25

f. 0x37

Question 9

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:

0x100

Select one:

a. 0x25

b. 0x10C

c. 0xAC

d. 0x37

e. 0x104

f. 0x14

Question 10

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:

(%rbx, %rax)

Select one:

a. 0x37

b. 0x14

c. 0x104

d. 0x25

e. 0xAC

f. 0x10C

Question 11

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:
(%rdx,%rcx,2)

Select one:

a. 0x25

b. 0xAC

c. 0x14

d. 0x104

e. 0x37

f. 0x10C

Question 12

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:

2(%rbx,%rcx)

Select one:

a. 0x10C

b. 0x25

c. 0x104

d. 0xAC

e. 0x37

f. 0x14

Question 13

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:
0xFC(,%rax,4)

Select one:

a. 0x14

b. 0x37

c. 0x104

d. 0xAC

e. 0x10C

f. 0x25

Question 14

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This problem is similar to practice problem 3.1. Please complete that problem before this one.

Assuming the operand is a double word, what is the value of an instruction\'s operand if the operand is:
236(,%rax,8)

Select one:

a. 0xAC

b. 0x104

c. 0x10C

d. 0x14

e. 0x25

f. 0x37

Question 15

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Using the following variable declarations:

   char ch;
   int in;
   long ln;
   short sn;

Provide a matching between the C statement and the corresponding X86-64 assembly instruction.

movw    $3, -18(%rbp)

movb    $3, -1(%rbp)

movq    $3, -16(%rbp)

movl    $3, -8(%rbp)

Question 16

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Using the following C type declarations:

char * cp1, * cp2;
int * ip;
long * lp;
unsigned short * usp;
unsigned int * uip;

Provide a matching between the C statements and the equivalent X86-64 assembly.

movb    (%rax), %r11b
movb    %r11b, (%rbx)

movsbl (%rcx), %r10d
movl    %r10d, (%rbx)

movq    (%rax), %rax
movl    %eax, %r14d
movl    %r14d, (%rbx)

movzwl (%rax), %r14d
movl    %r14d, %eax
movq    %rax, (%rcx)

movsbq (%rax), %rax
movq    %rax, (%rcx)

movzwl (%rax), %r14d
movl    %r14d, (%rbx)

Question 17

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Given the following initial register values:

%rsp: 0x100

%rdx: 0x25

and these values in memory:

0xf8: 0x25

0x100: 0xfc

0x108: 0x44

which of these is true after executing the statement:

popq %rdx

Select one:

a. %rsp = 0xf8, %rdx = 0x44

b. %rsp = 0x100, %rdx = 0xfc

c. %rsp = 0x100, %rdx = 0x25

d. %rsp = 0x108, %rdx = 0xfc

e. %rsp = 0x108, %rdx = 0x25

Question 18

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Given the following initial register values:

%rsp: 0x100

%rdx: 0x25

which of these is true after executing the statement:

pushq %rdx

Select one:

a. %rsp = 0xf8, %rdx = 0x25, mem[0x100] = 0x25

b. %rsp = 0x100, %rdx = 0x25, mem[0x100] = 0x25

c. %rsp = 0x100, %rdx = 0x25, mem[0xf8] = 0x25

d. %rsp = 0xf8, %rdx = 0x25, mem[0xf8] = 0x25

e. %rsp = 0x108, %rdx = 0x25, mem[0x108] = 0x25

movq	Answer 1Choose...1248
movw	Answer 2Choose...1248
movb	Answer 3Choose...1248
movl	Answer 4Choose...1248

Solution

1 ans) a. %rip

2 ans) mov q

3 ans) char *

4ans) long

5 ans) c. 0x25

6ans) d.0x104

7 ans) d. 0xAC

8 ans) a. 0x10C

9 ans) c. 0x14

10 ans) e. 0xAC

11 ans) c. 0x14

12ns) e. 0x37

13ans) d. 0xAC

14 ans) b. 0x104

15ans) movb    $3, -1(%rbp)

16 ans)

movq    (%rax),

%rax
movl    %eax,

%r14d
movl    %r14d,

(%rbx)

17ans) b. %rsp = 0x100, %rdx = 0xfc

18 ans) e. %rsp = 0x108, %rdx = 0x25, mem[0x108] = 0x25