gnu组件标签前面的美元符号的含义是什么？
例如， mov msg有什么区别，％si 和 mov $ msg，％si
#includecommon.h
BEGIN
mov $ msg，％si
mov $ 0x0e，％ah
循环：
lodsb
或％al，％al
jz暂停
int $ 0x10
jmp循环
暂停：
hlt
msg：
.asciz hello world
在寻址常量时使用$（美元）符号，例如：
movl $ 1，％eax （把 1 到％eax 寄存器）
或处理某个变量的地址时，例如： movl $ var，％eax （这意味着将地址 var 标签并放入％ eax 寄存器）。
如果您不要使用美元符号，这意味着从 var 标签并将其注册为。
What is the meaning of a dollar sign in front of a gnu assembly label?
For example, what is the difference between mov msg, %si and mov $msg, %si
(For more context, I'm playing around with the x86 Bare Metal Examples: https://github.com/cirosantilli/x86-bare-metal-examples/blob/master/bios_hello_world.S)
#include "common.h"
BEGIN
mov $msg, %si
mov $0x0e, %ah
loop:
lodsb
or %al, %al
jz halt
int $0x10
jmp loop
halt:
hlt
msg:
.asciz "hello world"
(What do the dollar ($) and percentage (%) signs represent in assembly intel x86? discusses the general use of % before registers and $ before constants; but, I don't think it lays out the use of $ with labels nearly as clearly as the answer below )
You use $(dollar) sign when addressing a constant, e.g.:movl $1, %eax (put 1 to %eax register)or when handling an address of some variable, e.g.: movl $var, %eax (this means take an address of var label and put it into %eax register).If you don't use dollar sign that would mean "take the value from var label and put it to register".
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