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new to assembly

 
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  #1
Jun 26th, 2009
hello everyone! i usually hang around the c++ area, but I'll need to learn assembly for computer architecture 2 in the fall so here it is. I wrote a simple program to convert temperatures from C to F. PCspim doesn't like it for some reason.

here are my codes, it just won't run.

assembly Syntax (Toggle Plain Text) 
  1. 	.text
  2. 	.globl _start
  3. _start:
  4.  
  5. 	la $a0, prompt   
  6. 	li $v0, 4
  7. 	syscall
  8.  
  9. 	li $v0, 5	
  10. 	syscall
  11.  
  12. 	mul $t0, $v0, 9 
  13. 	div $t0, $t0, 5  
  14. 	addi $t0, $t0, 32	
  15.  
  16. 	la $a0, ans1
  17. 	li $v0, 4
  18. 	syscall
  19.  
  20. 	move $a0, $t0
  21. 	li $v0, 1
  22. 	syscall
  23.  
  24. 	la $a0, endl
  25. 	li $v0, 4
  26. 	syscall
  27.  
  28. 	li $v0, 10
  29. 	syscall
  30.  
  31.  
  32. 	.data
  33. 	prompt:  .asciiz  "enter the temperature in celcius: "
  34. 	ans1:	 .asciiz  "The temperature in F is: "
  35. 	endl:	 .asciiz  "\n"
Last edited by homeryansta; Jun 26th, 2009 at 1:30 am.
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Re: new to assembly

 
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  #2
Jun 26th, 2009
Have you tested the installation, by writing the "hello world" program?

A simple print string and halt.
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Re: new to assembly

 
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  #3
Jun 26th, 2009
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Originally Posted by Salem View Post
Have you tested the installation, by writing the "hello world" program?

A simple print string and halt.
yes I have, and it works fine
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Re: new to assembly

 
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  #4
Jun 26th, 2009
OK, so it's just divide and conquer to move from something which works, to something which doesn't.

li $v0, 5
syscall
Does this actually return an integer result in a register?
Or did it assume a pointer to a string.

Imagine that I don't have the manual for your psim syscall's.
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Re: new to assembly

 
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  #5
Jun 26th, 2009
ok, I'm an idiot. double underscore is require for _ _ start
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