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lab5_ex1.asm (850B)


      1 .eqv SYS_PRINT_WORD     1
      2 .eqv SYS_PRINT_STRING   4
      3 .eqv SYS_READ_STRING    8
      4 .eqv SYS_EXIT           10
      5 
      6 .data
      7         str:    .space 17 # + 2 bytes to include '\n' and '\0'
      8         len:    .asciiz "strlen: "
      9         revstr: .asciiz "reverse: "
     10         
     11 .text
     12 .globl main
     13 
     14 main:
     15         # read input string
     16         li      $v0, SYS_READ_STRING
     17         la      $a0, str
     18         li      $a1, 17
     19         syscall
     20         
     21         # init strlen counter
     22         li      $t0, 0
     23         
     24 strlen:
     25         lb      $t1, str($t0)
     26         beqz    $t1, exit
     27         addi    $t0, $t0, 1
     28         j       strlen
     29 
     30 exit:
     31         li      $v0, SYS_PRINT_STRING
     32         la      $a0, len
     33         syscall
     34         
     35         li      $v0, SYS_PRINT_WORD
     36         la     	$a0, 0($t0)
     37         syscall
     38                                 
     39         li      $v0, SYS_EXIT
     40         syscall