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help with ASM

 
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Sare
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PostPosted: Sat Nov 04, 2017 1:51 pm    Post subject: help with ASM Reply with quote

I have something that looks like this
Code:
sub ecx,eax
  mov [Doukutsu.exe+9E6CC],cx


If I understand this right then what these instructions are doing is that its copying "Doukutsu.exe+9E6CC" and sending it to cx and cx becomes the new address. Am I right or if wrong could someone explain what it does?

Could someone give me some good tutorials that you recommend for a starter?
I have read the tutorial on the forum.
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Zanzer
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PostPosted: Sat Nov 04, 2017 7:41 pm    Post subject: Reply with quote

Opposite. Left value is the destination, right is the source.
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OldCheatEngineUser
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PostPosted: Sat Nov 04, 2017 11:45 pm    Post subject: Reply with quote

intel:
operation dist, src

amd:
operation src, dist

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Prehistoricman
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PostPosted: Sun Nov 05, 2017 5:55 am    Post subject: Reply with quote

OldCheatEngineUser wrote:
intel:
operation dist, src

amd:
operation src, dist


What do you mean by this? AMD processors use Intel's x86 instruction set. Are you saying that amd64 instructions use that convention (which would also be followed on Intel processors)?

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mindoff
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PostPosted: Sun Nov 05, 2017 7:48 am    Post subject: Reply with quote

If you can access youtube,there are plenty of tutorials about CE and ASM for beginners.
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ParkourPenguin
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PostPosted: Sun Nov 05, 2017 7:55 am    Post subject: Reply with quote

Prehistoricman wrote:
What do you mean by this?

What that person said doesn't make sense. I'd guess they meant to say Intel vs AT&T syntax, but that's still largely irrelevant with regards to your original question.

CE uses Intel syntax where the destination is typically the first operand and the source (if applicable) is typically the second operand.
Code:
sub ecx,eax - subtracts eax from ecx and stores the result in ecx

mov [Doukutsu.exe+9E6CC],cx - writes the 16 bits of data in cx to the specified memory address

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OldCheatEngineUser
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PostPosted: Sun Nov 05, 2017 8:21 am    Post subject: Reply with quote

ParkourPenguin wrote:
Prehistoricman wrote:
What do you mean by this?

What that person said doesn't make sense. I'd guess they meant to say Intel vs AT&T syntax, but that's still largely irrelevant with regards to your original question.

CE uses Intel syntax where the destination is typically the first operand and the source (if applicable) is typically the second operand.
Code:
sub ecx,eax - subtracts eax from ecx and stores the result in ecx

mov [Doukutsu.exe+9E6CC],cx - writes the 16 bits of data in cx to the specified memory address

I meant nasm vs at&t

edit:
well yeah, or I should said Intel vs at&t.

another edit:
from what I remember AMD was using at&t syntax, that's whyvi said AMD vs Intel.

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MulleDK19
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PostPosted: Mon Nov 06, 2017 1:12 pm    Post subject: Re: help with ASM Reply with quote

Sare wrote:
I have something that looks like this
Code:
sub ecx,eax
  mov [Doukutsu.exe+9E6CC],cx


If I understand this right then what these instructions are doing is that its copying "Doukutsu.exe+9E6CC" and sending it to cx and cx becomes the new address. Am I right or if wrong could someone explain what it does?

Could someone give me some good tutorials that you recommend for a starter?
I have read the tutorial on the forum.


The first operand is the destination, the second is the source.
The destination in this case is the memory at Doukutsu.exe+9E6CC (The game's base address + an offset), and the source is CX, the lower 16-bit of the ECX register. Thus the instruction writes CX to the first 2 bytes (16-bit) of the memory at Doukutsu.exe+9E6CC

There are lots of tutorials out there on getting started with x86 assembly.
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