x86汇编中的美元($)和百分比(％)符号代表什么? [英] What do the dollar ($) and percentage (%) signs represent in x86 assembly?

问题描述

我试图了解汇编语言如何用于微型计算机体系结构类，并且在示例中始终面对不同的语法:

I am trying to understand how the assembly language works for a micro-computer architecture class, and I keep facing different syntaxes in examples:

sub $48, %esp
mov %eax, 32(%esp)

这些代码是什么意思? esp寄存器的32位操作数是什么?

What do these codes mean? What is the 32 operand an addition to the esp register?

推荐答案

那不是Intel语法，其 AT& T语法，也称为 GAS语法.

Thats not Intel syntax, its AT&T syntax, also called GAS syntax.

$前缀用于立即数(常量)，%前缀用于寄存器(它们是必需的 ¹ ).

the $ prefix is for immediates (constants), and the % prefix is for registers (they are required¹).

有关AT& T语法的更多信息，另请参见 [att]标签Wiki .

For more about AT&T syntax, see also the [att] tag wiki.

¹ 除非指定了noprefix选项，否则请参见此处.但是通常noprefix仅与.intel_syntax noprefix一起使用，以获得类似于MASM的语法.

¹ Unless the noprefix option is specified, see here & here. But usually noprefix is only used with .intel_syntax noprefix, to get MASM-like syntax.

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