; A macro with two parameters
; Implements the write system call
%macro write_string 2
mov eax, 4
mov ebx, 1
mov ecx, %1
mov edx, %2
int 80h
%endmacro
section .text
global _start ;must be declared for using gcc
_start: ;tell linker entry point
write_string msg1, len1
write_string msg2, len2
write_string msg3, len3
mov eax,1 ;system call number (sys_exit)
int 0x80 ;call kernel
section .data
msg1 db 'Hello, programmers!',0xA,0xD
len1 equ $ - msg1
msg2 db 'Welcome to the world of,', 0xA,0xD
len2 equ $- msg2
msg3 db 'Linux assembly programming! '
len3 equ $- msg3
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