ISA

Question 1

What is architecture?

Answer 1

programmer’s view of the computer. Defined by instruction set and operand locations

Question 2

Instruction

Answer 2

words in a computer language. Carried out on operands.

Question 3

Instruction set

Answer 3

computers vocabulary

Question 4

What does a compiler do?

Answer 4

convert high level language to machine language

Question 5

What is assembly language?

Answer 5

human-readable representation of the computer’s native language

Question 6

Give three examples of physical locations of operands in a computer

Answer 6

Registers, constants/immediates, memory

Question 7

How many registers does ARM have? How many bits in each register?

Answer 7

16 registers, 32 bits

Question 8

What are the uses for R14 and R15 respectively?

Answer 8

Link register, PC

Question 9

What is the base address?

Answer 9

address of first element

Question 10

What is the job of the function caller?

Answer 10

Passes arguments to callee, jumps to callee

Question 11

What is the job of the function callee?

Answer 11

Performs the function, returns result to caller, returns to point of call. Must not overwrite registers or memory needed by caller

Question 12

What are the three instruction formats for machine instructions?

Answer 12

Data-processing, memory, branch

Question 13

For branch instructions? what is the branch target address?

Answer 13

The next PC when branch taken, it is relative to current PC+8. imm24 is the number of words BTA is away from PC+8.