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lab4_ex6.asm (1519B)


      1 .eqv SYS_PRINT_STRING   4
      2 .eqv SYS_READ_WORD      5
      3 .eqv SYS_EXIT           10
      4 .eqv SYS_PRINT_CHAR     11
      5 
      6 .macro input(%msg)
      7         li      $v0, SYS_PRINT_STRING
      8         la      $a0, %msg
      9         syscall
     10         
     11         li      $v0, SYS_READ_WORD
     12         syscall
     13 .end_macro
     14 
     15 .macro ispositive(%val)
     16         # exit if t0 or $t1 <= 0
     17         beq     %val, $zero, err
     18         slt     $t2, %val, $zero
     19         bne     $t2, $zero, err
     20 .end_macro
     21 
     22 .data
     23         msg1:   .asciiz "Lines: "
     24         msg2:   .asciiz "Chars: "
     25         errstr: .asciiz "Give positive numbers only.\n"
     26 
     27 .text
     28 .globl main
     29 
     30 main:
     31         input(msg1)
     32         move    $t0, $v0
     33         
     34         input(msg2)
     35         move    $t1, $v0
     36         
     37         ispositive($t0)
     38         ispositive($t1)
     39         
     40         # init outer loop counter
     41         li      $t3, 0
     42         
     43 outloop:
     44         # exit if t3 == x
     45         beq     $t3, $t0, exit
     46         addi    $t3, $t3, 1
     47 
     48         # init inner loop counter
     49         li      $t4, 0
     50 
     51         # print newline
     52         li      $v0, SYS_PRINT_CHAR
     53         li      $a0, 0xa
     54         syscall
     55         j       inloop
     56         
     57         j       outloop 
     58         
     59 inloop:
     60         # break inner loop if t4 == y
     61         beq     $t4, $t1, outloop
     62         addi    $t4, $t4, 1
     63         
     64         li      $v0, SYS_PRINT_CHAR
     65         li      $a0, '*'
     66         syscall
     67         
     68         j       inloop
     69 
     70 err:
     71         li      $v0, SYS_PRINT_STRING
     72         la      $a0, errstr
     73         syscall
     74 
     75 exit:
     76         li      $v0, SYS_EXIT
     77         syscall