5.85 · exercise

Fill in the blank: ARMv8 assembly

Fill in the missing mnemonics, suffixes, and symbols across stack frames, flag setting, branching, and gdb stepping.

0 of 5 correct

Fill in the blank

Allocate 16 bytes on the stack and store the frame record there in one instruction.

stp x29, x30, [sp, -16]

Fill in the blank

Subtract x2 from x1 into x0 and set the condition flags (N, Z, C, V).

sub x0, x1, x2

Fill in the blank

Ask gdb to reprint the current instruction automatically after every step.

$pc

Fill in the blank

A pre-test while loop runs its body while the signed value in x19 is less than 10. After the compare cmp x19, 10, branch past the body when the loop should stop.

b. done

Fill in the blank

Branch back to the label top unconditionally.

top