汇编MOVS指令

<pre><code class="lang-bash">section .text global _start ;must be declared for using gcc _start: ;tell linker entry point mov ecx, len mov esi, s1 mov edi, s2 cld rep movsb mov edx,20 ;message length mov ecx,s2 ;message to write 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 s1 db 'Hello, world!',0 ;string 1 len equ $-s1 section .bss s2 resb 20 ;destination </code></pre>

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<pre><code class=\"lang-bash\">section .text global _start;must be declared for using gcc _start:;tell linker entry point
<pre><code class=\"lang-bash\">section .text global _start;must be declared for using gcc _start:;tell linker entry point
<pre><code class=\"lang-bash\">section.text global _start;must be declared for using gcc _start:;tell linker entry point
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<pre><code class=\"lang-bash\">SYS_EXITequ 1 SYS_WRITE equ 4 STDINequ 0 STDOUTequ 1 section.text
<pre><code class=\"lang-bash\">section.text global _start;must be declared for linker (ld)
<pre><code class=\"lang-bash\">section .text global _start;must be declared for linker (gcc)
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<pre><code class=\"lang-bash\">section.text global _start;must be declared for linker (gcc)
<pre><code class=\"lang-bash\">segment .text;code segment global_start;must be declared for linker
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