Lab Review 2

What is the purpose of pseudo-operations (pseudo-ops) in assembly language?

• They are instructions executed by the CPU.

• They are assembler directives that tell the assembler where to put a program or allocate space.

• They act as comments for the programmer.

• They perform calculations when the program executes.

What is the symbol table for the following program?

• 
• 
• 
• 

Which of the following is NOT a reason we’d use the stack?

• To save and restore registers

• To allow for recursive subroutine calls

• To allocate space for local variables

• To dynamically allocate memory

Which of the following are the responsibilities of the callee? Select all that apply.

• JSR to the subroutine

• Save and restore registers

• Pushes and pops arguments

• Stores return value on stack

What is the problem with this callee buildup?

• We should be saving space for the return value after the local variables

• The registers are being saved in the incorrect order

• The frame pointer is set incorrectly

• Nothing, it’s perfect.

What is the correct order of stack teardown?

• Callee: save return value, restore RS & R7, restore registers, RET; Caller: pop arguments, pop return value

• Callee: restore registers, restore R5 & R7, save return value; Caller: RET, pop arguments, pop return value

• Callee: save return value, restore R5 & R7, RET; Caller: restore registers, pop return value, pop arguments

• Callee: save return value, restore registers, restore R5 & R7, RET; Caller: pop return value, pop arguments

What does R6 point to when we finish callee teardown and call RET?

• Return value

• Old frame pointer

• First argument

• Last argument

Which of the following is true about JMP and JSR?

• JMP is used for conditional jumps while JSR is used for unconditional jumps.

• JSR saves the return address in R7, while JMP does not.

• Using JMP is usually associated with using RET as well, while JSR is not.

• Both JSR and JMP save the return address.

Where will an error occur in this program?

• LDR R4, R3, #0

• LD R0, ARRAY

• BRzp FOR_END

• LENGTH .fill -5

What are the values loaded into R0, R1, R2, and R3 respectively?

• x3005, x3005, x3005, xBEEF

• x3005, x3005, x3004, xBEEF

• x3005, xBEEF, x3005, x3004

• x3005, xBEEF, x3004, x3005