汇编常量

<pre><code class=”lang-bash”>SYS_EXIT equ 1
SYS_WRITE equ 4
STDIN equ 0
STDOUT equ 1
section .text
global _start ;must be declared for using gcc

_start: ;tell linker entry point
mov eax, SYS_WRITE
mov ebx, STDOUT
mov ecx, msg1
mov edx, len1
int 0x80

mov eax, SYS_WRITE
mov ebx, STDOUT
mov ecx, msg2
mov edx, len2
int 0x80

mov eax, SYS_WRITE
mov ebx, STDOUT
mov ecx, msg3
mov edx, len3
int 0x80

mov eax,SYS_EXIT ;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
</code></pre>