Trying to pass a value to reserved byte

Question

I wanna pass "hello world" to the reserved "teste", but it just reads the first character of the string passed.

section .bss
    teste resb 1024

section .text
    global main

main:
    mov byte [teste], "hello world"

    mov eax, 4
    mov ebx, 1
    mov ecx, teste
    mov edx, 10
    int 0x80

exit_program:
    mov eax, 1      
    xor ebx, ebx
    int 0x80

I already tried changing from byte to qword, but it only add more 3 bytes and print "hell"

Answer 1

I already tried changing from byte to qword, but it only add more 3 bytes and print "hell"

In 32-bit programming you can't use a 64-bit immediate. You can do this in just 3 dword moves:

mov  ecx, teste
mov  dword [ecx], "hell"
mov  dword [ecx + 4], "o wo"
mov  dword [ecx + 8], "rld "
mov  eax, 4
mov  ebx, 1
mov  edx, 10
int  0x80

mov dword [ecx + 8], "rld" is valid too. NASM will then zero-pad to write a full dword.

In order to display the whole message, use mov edx, 11 (10 is one short).

It worked, but if I have a long string it won't be trivial doing that way... Isn't there a better way of doing that?

If you had a long string it would already be in memory somewhere, wouldn't it? Then you just copy it to the .bss:

mov  edi, teste
mov  esi, message
mov  ecx, length
rep movsb

...

message  db 'This is a long string to copy elsewhere'
length   equ $ - message