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[SOLVED] Creating a Loop to check a value and change it !!!

 
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Faloop
How do I cheat?
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Joined: 07 Jul 2021
Posts: 7
Location: EUA

PostPosted: Fri Jun 16, 2023 9:27 pm    Post subject: [SOLVED] Creating a Loop to check a value and change it !!! Reply with quote

I'm trying to create a Loop, to check if the value of an andress is 0, if it's equal to zero, change it to the value of x, and so on little by little

I've been trying this
Code:
newmem:
xor eax,eax
mov eax,[eax*4+tests]
cmp eax,[eax*4+tests]
jne endpop
inc eax
mov [eax*4+tests],1
endpop:
popad

tests:
dd 0000000000
dd 0000000000
dd 0000000000
dd 0000000000
dd 0000000000



so that I didn't have to extend the code infinitely for this:

Code:
cmp byte ptr [ADP],0
jne ARP_01
mov byte ptr [ADP],1
mov ecx,FFCCAA00
jmp _endfinal

ARP_01:
cmp byte ptr [ADP+4],0
jne ARP_02
mov byte ptr [ADP+4],1
mov ecx,FFCCAA01
jmp _endfinal

ARP_02:
cmp byte ptr [ADP+8],0
jne ARP_03
mov byte ptr [ADP+8],1
mov ecx,FFCCAA02
jmp _endfinal

exit:
jmp returnhere

_endfinal:
mov [esp+2C],ecx
push ecx
mov ebx,00000010+4
jmp exit


Last edited by Faloop on Fri Jun 16, 2023 11:36 pm; edited 1 time in total
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ParkourPenguin
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Joined: 06 Jul 2014
Posts: 4371

PostPosted: Fri Jun 16, 2023 10:35 pm    Post subject: Reply with quote

If you want to learn more about assembly, you can put code into a compiler and see what assembly it generates. C code:
Code:
#include <stddef.h>

const size_t N = 500;

extern void _endfinal(), _return(unsigned);

void foo(char *a, unsigned ecx_val) {
    for (size_t i = 0; i < N; ++i) {
        if (a[i] == 0) {
            a[i] = 1;
            ecx_val = 0xFFCCAA00+i;
            break;
        }
    }
    _endfinal();
    _return(ecx_val);
}
GCC 13.1, arguments -O2 -m32
Code:
foo:
        push    ebx
        xor     eax, eax
        sub     esp, 8
        mov     edx, DWORD PTR [esp+16]
        mov     ebx, DWORD PTR [esp+20]
        jmp     .L4
.L2:
        add     eax, 1
        cmp     eax, 500
        je      .L3
.L4:
        cmp     BYTE PTR [edx+eax], 0
        jne     .L2
        mov     BYTE PTR [edx+eax], 1
        lea     ebx, [eax-3364352]
.L3:
        call    _endfinal
        mov     DWORD PTR [esp+16], ebx
        add     esp, 8
        pop     ebx
        jmp     _return
N:
        .long   500
(64-bit code would be different)

You could also use {$ccode} to avoid assembly:
https://forum.cheatengine.org/viewtopic.php?t=618134

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Faloop
How do I cheat?
Reputation: 0

Joined: 07 Jul 2021
Posts: 7
Location: EUA

PostPosted: Fri Jun 16, 2023 11:36 pm    Post subject: Reply with quote

ParkourPenguin wrote:
If you want to learn more about assembly, you can put code into a compiler and see what assembly it generates. C code:
Code:
#include <stddef.h>

const size_t N = 500;

extern void _endfinal(), _return(unsigned);

void foo(char *a, unsigned ecx_val) {
    for (size_t i = 0; i < N; ++i) {
        if (a[i] == 0) {
            a[i] = 1;
            ecx_val = 0xFFCCAA00+i;
            break;
        }
    }
    _endfinal();
    _return(ecx_val);
}
GCC 13.1, arguments -O2 -m32
Code:
foo:
        push    ebx
        xor     eax, eax
        sub     esp, 8
        mov     edx, DWORD PTR [esp+16]
        mov     ebx, DWORD PTR [esp+20]
        jmp     .L4
.L2:
        add     eax, 1
        cmp     eax, 500
        je      .L3
.L4:
        cmp     BYTE PTR [edx+eax], 0
        jne     .L2
        mov     BYTE PTR [edx+eax], 1
        lea     ebx, [eax-3364352]
.L3:
        call    _endfinal
        mov     DWORD PTR [esp+16], ebx
        add     esp, 8
        pop     ebx
        jmp     _return
N:
        .long   500
(64-bit code would be different)

You could also use {$ccode} to avoid assembly:


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