Assembly code doesn't print string

Question

So basically I'm trying to write a hello world program in assembly. The program exits as it should but no string is printed along the way. There are no errors anywhere either. I suspect that I am declaring or using the string wrong somehow.

    .intel_syntax noprefix

.data

msg:
    .ascii "Hello World"

.text

.globl _start

_start:
    mov eax, 4 #call write
    mov ebx, 1 #output into stdout
    mov ecx, msg #what to write
    mov edx, 11 #length of what to write
    int 0x80

    mov eax, 1 #exit
    mov ebx, 0
    int 0x80

I have also tried replacing

mov ecx, msg

with

mov ecx, [msg]

but it doesn't seem to make a difference.

To be honest I'm unsure what an assembler actually is but to create the binary i use the commands "as -o HelloWorld.o HelloWorld.s" and "ld -o HelloWorld HelloWorld.o" — Latedi
– Latedi, Commented Oct 15, 2013 at 15:22

Jester · Accepted Answer · 2013-10-15 15:30:45Z

3

You need to use mov ecx, offset msg or lea ecx, msg. Also make sure you are assembling as 32 bit code in case you are on a 64 bit system.

answered Oct 15, 2013 at 15:30

Jester

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