2. What is the equivalent assembly program for the following that the assembler

Question

2. What is the equivalent assembly program for the following that the assembler assembles after macro expansion.

#<------------------ MACRO DEFINITIONS ---------------------->#
# Macro : print_str
# Usage: print_str(

)
.macro print_str($arg)
li $v0, 4 # System call code for print_str
la $a0, $arg # Address of the string to print
syscall # Print the string
.end_macro
# Macro : exit
# Usage: exit
.macro exit
li $v0, 10
syscall
.end_macro
# Macro: read_int
# Usage: read_int()
.macro read_int($arg)
li $v0,5 # Read intger
syscall
move $arg, $v0 # move the data to target reg
.end_macro
# Macro: push
# Usage: push ()
.macro push($reg)
sw $reg, 0x0($sp) # M[$sp] = R[reg]
addi $sp, $sp, -4 # R[sp] = R[sp] - 4
.end_macro
#<------------------ PROG DEFINITIONS ----------------------->#
.text
.globl main
main:
print_str(msg1)
read_int($s0)
beqz $s0, fib_end
# Push the first base 0
add $s1, $zero, $zero
push($s1)
addi $s0, $s0, -1
beqz $s0, fib_end
# Push the second base 1
addi $s2, $zero, 1
push($s2)
addi $s0, $s0, -1
fib_loop:
beqz $s0, fib_end
add $s3, $s2, $s1
push($s3)
move $s1, $s2
move $s2, $s3
addi $s0, $s0, -1
j fib_loop
fib_end:
exit
#<------------------ DATA DEFINITIONS ----------------------->#
.data
msg1: .asciiz "How many Fibonacci to generate?

Explanation / Answer

.macro print_str($arg) li $v0, 4 #System call code for print_str la $a0, $arg #Address of the string to print syscall # print the string .end_macro #macro : print_int #usage : rint_int() .macro print_int($arg) li $v0, 1 # system call code for print_int li $a0, $arg # integer to print syscall # print the integer .end_macro .macro read_int($reg) li $v0, 5 #system call code to read_int syscall move $reg, $v0 .end_macro .macro print_reg_int($reg) li $v0, 1 move $a0, $reg syscall .end_macro .macro swap_hi_lo($temp1, $temp2) mtlo $a0 mflo $temp1 mthi $a0 mfhi $temp2 .macro print_hi_lo($strHi, $strEqual, $strComma, $strLo) li $v0, 4 la $a0, $strHi #Address of the string to print syscall li $v0, 4 la $a0, $strEqual #Address of the string to print syscall li $v0, 4 la $a0, $strComma #Address of the string to print syscall .macro exit li $v0, 10 syscall .end_macro

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