Assembly Code Refence

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10-15-2006
mkylman

Assembly Code Refence

Hi, I'm hoping that this is the proper forum, considering that I only know of ASM being used on windows...Anyway, I was wondering if there was a place where I could get an overview of ASM Commands, like a list...Sorta like

Jmp = Jump
Jne = Jump if not equal
Je = Jump if equal
Jg = Jump if greater than
Jge = Jump if greater than or equal to
Nop = No operation

etc, etc, etc...The jumps and nop are all that I understand...I've done a few google searches but have only come up with massive books, so I was wondering if anyone knew of any lists...

Thanks in advance,
Mike
10-15-2006
maxorator

They're hard to find, but I found some:
http://www.woodmann.com/crackz/Tutorials/Drme2.htm
http://solaris.license.virginia.edu:...86/@Ab2TocView

Assembly instructions are processor-specific, that's why there is no "one big reference".
10-15-2006
mkylman

Quote:

http://www.woodmann.com/crackz/Tutorials/Drme2.htm
http://solaris.license.virginia.edu:...86/@Ab2TocView

Sweet, thanks! The first one is like exactly what I was looking for

Quote:

Assembly instructions are processor-specific, that's why there is no "one big reference".

*Sigh* I figured that...
I've often heard it said that learning assembly is a good way to make your program run more efficiently, is this true? Is it possible to learn assembly, considering that it's all processor specific? I'm almost certain this is a dumb question, but when you say "processor" you mean Windows versus Linux, not Pentium III versus Pentium IV right?
10-15-2006
SMurf

No, we do mean Pentium III versus Pentium IV. (Windows and Linux are Operating Systems, not processors!)

So, what you want is a reference for Intel x86 assembly language. ;)

Plus I think you'll find that a modern C/C++ compiler will do everything that your attempts at assembly optimization can do and more.
10-15-2006
mkylman

Quote:

No, we do mean Pentium III versus Pentium IV.

Ah, okay thanks for that info...I didn't know that

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(Windows and Linux are Operating Systems, not processors!)

I know that, but I thought that they used different kinds of processors...

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So, what you want is a reference for Intel x86 assembly language.

Right, I've started to figure that out...So what other main processors are there? Does it vary with operating systems? Is that why I can't open certain files with W32dasm?

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Plus I think you'll find that a modern C/C++ compiler will do everything that your attempts at assembly optimization can do and more.

Yeah, I know that, but I want to know assembly code for disassembling a program, versus assembling one...
10-15-2006
CornedBee

Quote:

Originally Posted by mkylman

I know that, but I thought that they used different kinds of processors...

That would require Linux users to buy completely new computers, wouldn't it?

Actually, they kind of use different processors. Windows runs on x86, x86-64 (Athlon64 and Intel CPUs with EM64-T) and IA-64 (Intel Itanium). NT 4 also existed in an Alpha version.
Linux runs on all these, and many, many more.

Quote:

Right, I've started to figure that out...So what other main processors are there? Does it vary with operating systems? Is that why I can't open certain files with W32dasm?

The big CPUs in the desktop and server market are the x86 architecture, the x86-64, the IA-64, the PowerPC 32 and 64 (Macs before the change to Intel CPUs, as well as various IBM servers), and I believe the SPARC architecture.
In embedded systems, the most common CPUs use the ARM instruction set.

But the W32dasm issue is a different one, probably. Although probably all that stuff uses x86 instructions, the other issue is how these instructions are packed into files. A Win32 portable executable, an a.out executable, an ELF executable, Win32 dynamic libraries, ELF shared objects, MS .lib static libraries, GNU .a archives, MS .obj compiled objects, and GNU .o compiled objects all contain object code, but the stuff surrounding can be quite different.

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Yeah, I know that, but I want to know assembly code for disassembling a program, versus assembling one...

You won't really learn anything from that.

At least, nothing we on this board endorse.
10-15-2006
mkylman

Quote:

But the W32dasm issue is a different one, probably. Although probably all that stuff uses x86 instructions, the other issue is how these instructions are packed into files. A Win32 portable executable, an a.out executable, an ELF executable, Win32 dynamic libraries, ELF shared objects, MS .lib static libraries, GNU .a archives, MS .obj compiled objects, and GNU .o compiled objects all contain object code, but the stuff surrounding can be quite different.

So you're saying that the file extension matters right? Well I'm not too sure how that really matters because the file is an exe, a Win32 portable executable, if I think it means what it means...Firefox.exe would be a win32 portable executable right? Anyway...

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At least, nothing we on this board endorse.

I never asked you to help me do anything illegal (or that I was doing anything illegal), I just wanted to know if anyone knew of any asm references I could use so that I could decypher what the hell Win32dasm is outputting
10-16-2006
Bleech

I believe this may be what you are looking for:

http://www.megaupload.com/?d=B7ZUADW0

note to mods: it is not a direct download link, nor is it warez, it is included in the masm32 package which is freeware.
10-16-2006
maxorator

I couldn't find the "download" button.
10-16-2006
mkylman

Quote:

I believe this may be what you are looking for:

Thanks man! I just downloaded it and looked at it...It looks like it's exactly what I was looking for, so now I've got 2 good references...that and the first link that maxorator gave me: http://www.woodmann.com/crackz/Tutorials

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I couldn't find the "download" button

I found it...It's next to the MegaUpload logo...It says please write x letters, then next to it there's a text box, write the letters in the text box...Next to the text box there is a download button...
10-17-2006
maxorator

This should be one of the best references:
http://en.wikibooks.org/wiki/X86_Ass...6_Instructions
10-17-2006
Frobozz

The Art of Assembly website is also good to check especially since it covers 32-bit Windows and Linux.
10-17-2006
mkylman

Quote:

This should be one of the best references:
http://en.wikibooks.org/wiki/X86_Ass...6_Instructions

Ah wikipedia, perhaps one of the best references of all...

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The Art of Assembly website is also good to check especially since it covers 32-bit Windows and Linux.

Dude, I just now checked that site out. Amazing, tons of information in the Windows section. Thanks man!

One final question, are there any X-86 Assembly Language "compilers", or is it an language interpreted like python?

Thanks,
Mike
10-17-2006
Frobozz

Eh what you need is actually called an assembler. There are a good number out there. Which one you choose generally depends on how much you like the style and the features it has. I personally liked the Netwide Assembler, its available for multiple x86 platforms. Another popular one is the Flat Assembler but I've never tried using it.
10-17-2006
mkylman

Ah, an assembler...I was close though right? No I guess not...Well anyway, netwide assembler? Thanks man, I'll check that one out, along with the other one, Flat Assembler...

Okay, I just checked the site for Netwide Assembler...Umm, which one do I want? Win32 Binaries or DOS 32-bit Binaries? I'm assuming that it's Win32 Binaries, but it doesn't really hurt to ask does it? I just downloaded Flat Assembler and the Win32 version for Netwide Assembler, so I'll check them out and see which one I like the most.

Regards,
Mike