GAS LISTING main.s 			page 1


   1              	    # This is needed to link with glibc.
   2              	    .option pic0
   3              	    
   4              	    .rdata # read-only data
   5              	    
   6              	    .align  2
   7              	promptForA:
   8 0000 696E7075 	    .asciz  "input a: "
   8      7420613A 
   8      2000
   9              	    
  10 000a 0000     	    .align  2
  11              	intFormat:
  12 000c 256400   	    .asciz  "%d"
  13              	    
  14 000f 00       	    .align  2
  15              	promptForB:
  16 0010 696E7075 	    .asciz  "input b: "
  16      7420623A 
  16      2000
  17              	    
  18 001a 0000     	    .align  2
  19              	resultFormat:
  20 001c 20202020 	    .asciz  "    gcd: %d\n"
  20      6763643A 
  20      2025640A 
  20      00
  21              	    
  22 0029 00000000 	    .data # read/write data follows
  22      000000
  23              	    
  24              	    .align  2
  25              	scanfResult: # buffer for scanf() return
  26 0000 00000001 	    .word   1
  27              	
  28 0004 00000000 	    .text
  28      00000000 
  28      00000000 
  29              	    .align  2
  30              	    .globl  main
  31              	    .ent  main
  32              	    
  33              	main:
  34              	    # print the `a` prompt
  35 0000 3C040000 	    la      $a0, promptForA
  36 0004 0C000000 	    jal     printf
  36      24840000 
  37              	    
  38              	    # call scanf() to put `a` in $s0
  39 000c 3C040000 	    la      $a0, intFormat
  39      2484000C 
  40 0014 3C050000 	    la      $a1, scanfResult
  41 0018 0C000000 	    jal     scanf
  41      24A50000 
  42 0020 3C100000 	    lw      $s0, scanfResult # note the explicit address
  42      8E100000 
  43              	    
GAS LISTING main.s 			page 2


  44              	    # print the `b` prompt
  45 0028 3C040000 	    la      $a0, promptForB
  46 002c 0C000000 	    jal     printf
  46      24840010 
  47              	
  48              	    # call scanf() to put `b` in $s1
  49 0034 3C040000 	    la      $a0, intFormat
  49      2484000C 
  50 003c 3C050000 	    la      $a1, scanfResult
  51 0040 0C000000 	    jal     scanf
  51      24A50000 
  52 0048 3C110000 	    lw      $s1, scanfResult
  52      8E310000 
  53              	
  54 0050 02002025 	    move $a0, $s0
  55              	    move $a1, $s1
  56 0054 0C000000 	    jal gcd
  56      02202825 
  57 005c 00408825 	    move $s1, $v0
  58              	
  59              	    # print the result with printf()
  60 0060 3C040000 	    la      $a0, resultFormat
  60      2484001C 
  61              	    move    $a1, $s1
  62 0068 0C000000 	    jal     printf
  62      02202825 
  63              	
  64              		li      $a0,0
  65 0070 0C000000 	    jal     exit
  65      24040000 
  66              	
  67 0078 00000000 	    .end    main
  67      00000000 
GAS LISTING main.s 			page 3


DEFINED SYMBOLS
              main.s:7      .rodata:0000000000000000 promptForA
              main.s:11     .rodata:000000000000000c intFormat
              main.s:15     .rodata:0000000000000010 promptForB
              main.s:19     .rodata:000000000000001c resultFormat
              main.s:26     .data:0000000000000000 scanfResult
              main.s:33     .text:0000000000000000 main

UNDEFINED SYMBOLS
printf
scanf
gcd
exit