RE: Unable to use a variable in instruction

[A D <a_d_249@xxxxxxxxxxx>]

>A D wrote:
> I'm having strange problem accessing a variable in a gnu assembly language program.
> When i write a code:
> 
> .section .data
>    x = 4
> mm:
>    .int 1, 2
> 
> .section .text
> .globl _start
> _start:
>    nop
>    movl x, %ecx   #can't do this 
>
>
>
>


Kotler wrote: 
>>You're trying to access memory at address 4, not move the immediate 
>>value 4. Try "movl $x, %ecx".
>>
>>
>>


Plantz wrote:
>>So this instruction:
>>    movl x, %ecx   #can't do this 
>> 
>>is trying to move the 4 bytes stored at memory location 4 into the ecx
>>register. As the OS told you, you cannot do that.
>> 
>>The way to allocate an initialized 32-bit int in the .data section is:
>> 
>>x:     .long  4
 

This problem is resolved now. Thanks for clarifying this.

--DC

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