Y86装配全局变量 [英] Y86 assembly global variables

问题描述

我努力让全局变量为我Y86分配正常工作。不幸的是我们提供的唯一例子是IA-32装配。我已经寻找过去的几个小时，但无济于事。这是非常基本的，但我知道我在Y86一个完整的新手。

I am struggling to get global variables to work correctly for my Y86 assignment. Unfortunately the only examples we were provided with are in IA-32 assembly. I have searched for the last few hours but to no avail. This is very basic I know but I am a complete novice at Y86.

我宣布我的变量如下：

.align 4
x: .long 1
y: .long 4

当我使用他们的操作，如 irmovl X，EDX％我看到了价值380被分配到EDX寄存器，而不是价值4.我认为正在发生的事情是，我分配的内存位置寄存器，而不是价值。什么是正确的语法来设置全局变量的寄存器的值？

When I use them in an operation such as irmovl x, %edx I see the value 380 is assigned to the edx register instead of the value 4. I think what is happening is that I am assigned the memory location to the register instead of the value. What would be the correct syntax to set the value of the global variable to the register?

我一直在使用，而不是mrmovl试过，但我不能确定的语法与一个全局变量mrmovl的。

I have tried using mrmovl instead but am unsure of the syntax for mrmovl with a global variable.

mrmovl X，EDX％给我的错误X不是一个数字

mrmovl x, %edx give me the error "x is not a number"

推荐答案

irmovl 作为名字说是的我 mmediate为研究 egister。
你想 mrmovl ，因为这是<强> M 埃默里为研究 egister。

irmovl as the name says is immediate to register. You want mrmovl as that is memory to register.

至于语法，因为Y86不支持位移，我希望 mrmovl X，EDX％工作。你说没有，作为一种解决方法，你可以使用2说明：

As for the syntax, since y86 does support displacement, I would expect mrmovl x, %edx to work. You say it doesn't, as a workaround you could use 2 instructions:

irmovl x, %edx     # load address
mrmovl (%edx), %edx # fetch value

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