How to know some info?

[johncaponski]

Thanks you guys, but I am still trying to make a C program that makes the
same as the asm code. Could you please help me a little? I know that it is
not very difficult and I almost have it, but I am not completely sure about
it.

Thanks



johncaponski wrote:
> 
> Hi everyone! I've got an AT&T GNU assembler code produced by the
> compilation of a C program that I don't know. I need to answer some
> questions about it. The thing is that I want to know how could I get that
> information using gcc compiler, I mean, I just want to know the options I
> should use with gcc and "myfile.s" to get that info.
> 
> The questions are:
> 
> - What architecture was this code compiled for?
> - 32 or 64 bits?
> 
> In addition to that, I am asked to write the C program that generated that
> code. Is there any automatic way to do that?
> This is the code:
> 
>        .file "practica2_funcion.c"
>        .text
>        .p2align 4,,15
> .globl funcion
>        .type funcion, @function
> funcion:
>        pushl %ebp
>        movl    %esp, %ebp
>        pushl %esi
>        xorl    %esi, %esi
>        pushl %ebx
>        .p2align 4,,7
>        .p2align 3
> .L2:
>        leal    matriz(,%esi,4), %eax
>        xorl    %ecx, %ecx
>        .p2align 4,,7
>        .p2align 3
> .L3:
>        movl    (%eax), %ebx
>        addl    $512, %ecx
>        leal    0(,%ebx,8), %edx
>        subl    %ebx, %edx
>        movl    %edx, (%eax)
>        addl    $512, %eax
>        cmpl    $65536, %ecx
>        jne     .L3
>        addl    $1, %esi
>        cmpl    $128, %esi
>        jne     .L2
>        popl    %ebx
>        popl    %esi
>        popl    %ebp
>        ret
>        .size funcion, .­-funcion
>        .comm matriz,65536,32
>        .ident "GCC: (Debian 4.4.1­4) 4.4.1"
>                        .section      .note.GNU­stack,"",@progbits
> 
> 
> 
> Thank you in advance!
> 
> 

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