问题描述
我发现了一个例子，并编辑它的气体。
I found an example and was editing it for gas.
extern printf
.global _start
.data
hello:
db "Hello", 0xa, 0
.text
_start:
mov %rdi, hello
mov %rax, 0
call printf
mov %rax, 0
ret
但它不工作。怎么了？这是什么意思：
But it doesn't work. What's wrong? What does this mean:
hello:
db "Hello", 0xa, 0
我明白它的范围内存，但我不明白这个字符串
I understand what it scope of memory, but I don't understand this string
db "Hello", 0xa, 0
在这里
_start:
mov %rdi, hello
mov %rax, 0
call printf
mov %rax, 0
ret
操作系统：Linux（Debian的）。 Intel 64位
os: linux (debian). intel 64-bit
推荐答案
这是。众所周知的是C-string.Such字节在结束串说得清的字符串结尾。例如，您通过指针你的字符串调用一个子程序，程序会明白，内存这类字符串的区域是从乞讨 A [0] （在C术语），直到 A [X] == 0 看到。
It's is the null-byte-terminattor. Well-know as C-string.Such byte at end-of-string say where the string ends. For example,you pass the pointer to your string to call a routine,the routine will understand that the area of such string on memory is from begging a[0](in C terminology) until a[x] == 0 is seen.
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