汇编语言操作数说明符(Assembly Language Operand Specifiers)

汇编语言操作数说明符(Assembly Language Operand Specifiers)

我是学习汇编语言的新手，并且遇到了以下表达式：

9(%rax, %rdx) 0xFC(,%rcx,4) (%rax, %rdx, 4)

如果有人能指出我可以理解这些命令或向我解释这些命令的资源，我将非常感激。

谢谢。

I am new to learning assembly language and came across the following expressions:

9(%rax, %rdx) 0xFC(,%rcx,4) (%rax, %rdx, 4)

I would be really grateful if someone could point me to a resource where I can understand these commands or explain them to me.

Thank you.

最满意答案

这显然是指x86 AT＆T组件中的算术寻址。

语法很简单：

N(%reg1, %reg2, F)

这导致address = N + %reg1 + %reg2 * F 这可以在多个指令中用于访问结构内部的数据（C编译器）等。

如需完整参考，请查看本指南 。

This apparently refers to arithmetic addressing in x86 AT&T assembly.

The syntax is rather simple:

N(%reg1, %reg2, F)

This results in address = N + %reg1 + %reg2 * F. This can be used in multiple instructions for purposes like accessing data inside a struct (C compilers), etc.

For full reference, check this guide.