汇编求和

<pre><code class=”lang-bash”>section .text
global _start ;must be declared for using gcc

_start: ;tell linker entry point
mov eax,'3'
sub eax, '0'

mov ebx, '4'
sub ebx, '0'
add eax, ebx
add eax, '0'

mov [sum], eax
mov ecx,msg
mov edx, len
mov ebx,1 ;file descriptor (stdout)
mov eax,4 ;system call number (sys_write)
int 0x80 ;call kernel

mov ecx,sum
mov edx, 1
mov ebx,1 ;file descriptor (stdout)
mov eax,4 ;system call number (sys_write)
int 0x80 ;call kernel

mov eax,1 ;system call number (sys_exit)
int 0x80 ;call kernel

section .data
msg db "The sum is:", 0xA,0xD
len equ $ – msg
segment .bss
sum resb 1
</code></pre>