第一个汇编程序

.data
msg:
        .ascii "Hello,world!\n"
        len=.-msg
.text
.global _start
_start:
movl $len,%edx
movl $msg,%ecx
movl $1,%ebx
movl $4,%eax
int $0x80
movl $0,%ebx
movl $0,%ebx
movl $1,%eax
int $0x80