slae assembly primer

Question 1

What is the int operation?

Answer 1

interrupt, eg int 0x80 is system call

Question 2

What are the fundamental data types?

Answer 2

Byte, Word, Double Word, Quad Word, Double Quad Word

Question 3

How many bits is a byte?

Answer 3

8

Question 4

How many bits is a word?

Answer 4

16

Question 5

How many bits is a double word?

Answer 5

32

Question 6

How many bits is a quad word?

Answer 6

64

Question 7

How many bits is a double quad word?

Answer 7

128

Question 8

What is a signed data structure?

Answer 8

A signed word uses 31 bits to store the value and the most significant bit to store the sign (+/-)

Question 9

What is an unsigned data structure?

Answer 9

All 32 bits are used to store the value

Question 10

What does eax equal - mov eax, message ?

Answer 10

$eax = *message , or address of message

Question 11

What does eax equal: mov eax, [message] ?

Answer 11

$eax = message, or the value of message

Question 12

What is resb 64?

Answer 12

Reserve 64 bytes

Question 13

What is resw 1?

Answer 13

reserve a word

Question 14

What is the $ special token?

Answer 14

evaluates the current line

Question 15

What is the \$\$ special token?

Answer 15

evaluates to the beginning of the current section

Question 16

What is the times instruction?

Answer 16

Repeat instruction eg times 100 movsb - movsb replicated 100 times

Question 17

What are the four directions for the mov instruction?

Answer 17

1. between registers
2. Memory to register and register to memory
3. Immediate data to register
4. Immediate data to memory

Question 18

What is LEA?

Answer 18

Load Effective Address - load pointer values (LEA EAX, [label] sets $eax to pointer of label)

Question 19

What is XCHG?

Answer 19

Swap values , XCHG Register, Register or XCHG Register, Memory