Friday, March 29, 2013

Why Does This Assembly Code Break? - Assembly | Dream.In.Code


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    3 Replies - 41 Views - Last Post: Today, 09:55 AM

    #1 THX ?Icon User is offline

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    Posted Today, 07:56 AM

    why does this code break every time it hits, mov [eax], ebx?
    
 ;   .386 .model flat .stack 4096 .data    .code _start:  mov eax, 2   mov ebx, 7D12Eh mov [eax], ebx mov eax, 4 mov ebx, 568923h mov [eax], ebx mov  ebx, 3  mov [eax], ebx   ret   PUBLIC _start end  

    Is This A Good Question/Topic? 0

    Replies To: why does this assembly code break?

    #2 modi123_1 ?Icon User is offline

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    Re: why does this assembly code break?

    Posted Today, 07:59 AM

    _moving_ this to the assembly forum.


    #3 THX ?Icon User is offline

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    Re: why does this assembly code break?

    Posted Today, 08:31 AM

    View Postmodi123_1, on 29 March 2013 - 07:59 AM, said:

    _moving_ this to the assembly forum.



    #4 GunnerInc ?Icon User is online

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    Re: why does this assembly code break?

    Posted Today, 09:55 AM

    1. what are you trying to do?
    2. what do you think you are doing?

    when you add brackets around a register, the register becomes a pointer. You moved 2 into eax, so when you do:
    mov [eax], ebx, you are telling the cpu to move the value in ebx to the address - 2 which there is no such address.


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    Source: http://www.dreamincode.net/forums/topic/317103-why-does-this-assembly-code-break/

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