# Program to illustrate nested procedure calls

.data 0x0
string1:   .asciiz "Hello"
string2:   .asciiz " world\n"

.text 0x3000
main:
     jal hello
     ori $v0, $0, 10  # system call code for exit
     syscall          # exit the program
     
hello:
    addi $sp, $sp, -8   # make room on stack
    sw $ra, 4($sp)      # save $ra
    sw $fp, 0($sp)      # save $fp
    addi $fp, $sp, 4    # set $fp 
    li $v0, 4        # system call code for string
    la $a0, string1  # address of string is in $a0
    syscall          # print the string
    jal world
    lw  $ra, 0($fp)     # restore $ra 
    addi $sp, $fp, 4    # restore $sp
    lw  $fp, -4($fp)    # restore $fp
    jr $ra

world:
    li $v0, 4       
    la $a0, string2
    syscall        
    jr $ra