Instruction references undefined error in MIPS/QTSPIM

assembly mips qtspim
piyuyo picture piyuyo · Nov 8, 2014 · Viewed 16k times · Source

I am triying to count all characters in an array and i had the following error:

Instruction references undefined symbol at 0x00400014 [0x00400014] 0x0c000000 jal 0x00000000 [main] ; 188: jal main

.data

 string:    .asciiz "nice work..."



  .text
 .globl main

  lw $a0,string
  jal strlength
  li $v0, 10
  syscall

   # METHOD STRLENGTH
   # Receives as first parameter the direction of the first character of string.
   # Returns the length of the string.

   strlength: li $t0, 0  #numero de caracteres
   lb $t4,string($t0)       #recorremos la cadena
   beqz $t4, fin            #si el caracter es igual a cero vamos a fin    
   addi $t0,$t0, 1      
   j strlength

   move $a0,$t0               #imprimimos numero de caracteres 
   li $v0, 1
   syscall 
   jr $ra

Answer

Jester picture Jester · Nov 8, 2014

.globl main doesn't define the symbol, it just marks it as global if it will ever be defined. You need to add a main: label to the appropriate place, which in your case would probably be the first instruction.

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