Comparing FASM to TASM

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Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander 20 Jan 2009, 13:35

In the FASM Design Principles http://flatassembler.net/docs.php?article=design I've read about the following

Quote:

TASM would refuse to accept it, because I tried to store some larger data in a smaller variable. This feature was catching many mistakes and I felt I could not waive it. But I still liked the idea of label to be treated just like a constant equal to address, as it made such instructions:

mov ax,alpha
mov ax,[alpha]

I thought it isn't possible to do the following in fasm? Have I missed something?

Quote:

mov ax,alpha

What I haven't understood: What's the difference between TASM ORG and FASM ORG?

20 Jan 2009, 13:35

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20638
Location: In your JS exploiting you and your system

revolution 20 Jan 2009, 13:37

TASM requires you to use offset, fasm does not require it (and does not have an offset keyword).

Code:

alpha dw ?

TASM "ideal" mode:
1: mov ax,offset alpha
2: mov ax,[alpha]
fasm equivalent:
1: mov ax,alpha
2: mov ax,[alpha]

TASM "MASM" mode:
3: mov ax,alpha
4: mov ax,[alpha]
fasm equivalent:
3: mov ax,[alpha]
4: mov ax,[alpha]

Last edited by revolution on 20 Jan 2009, 13:43; edited 1 time in total

20 Jan 2009, 13:37

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander 20 Jan 2009, 13:41

That's why it hasn't worked all the time I tried "offset" in fasm. Oops Embarassed

revolution,

do you know any good tutorials out there for fasm in general or for fasm linux (I know we are on a windows thread) programming?

Thanks Very Happy

20 Jan 2009, 13:41

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20638
Location: In your JS exploiting you and your system

revolution 20 Jan 2009, 13:47

Alexander wrote:

do you know any good tutorials out there for fasm in general or for fasm linux (I know we are on a windows thread) programming?

Nope, but you can start here or here. hehe, dare I mention it, but also my website! Wink

Hehe, couldn't resist.

20 Jan 2009, 13:47

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander 20 Jan 2009, 13:51

Aren't there any tutorials out there? How have you learn fasm? Practive, I know. Any faster ways? Any suggestions, please?

20 Jan 2009, 13:51

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20638
Location: In your JS exploiting you and your system

revolution 20 Jan 2009, 13:53

Experience is the best teacher. Whenever I want to know if I can do something I just go and try it. I learn from both failure and success.

Without failure to compare with how would we know what is success?

Last edited by revolution on 20 Jan 2009, 13:54; edited 1 time in total

20 Jan 2009, 13:53

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander 20 Jan 2009, 13:54

The tutorial http://flatassembler.net/docs/tutorial.zip is very basic. Ascii, Dos and a missing appendix,... Crying or Very sad

20 Jan 2009, 13:54

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20638
Location: In your JS exploiting you and your system

revolution 20 Jan 2009, 13:57

Have a look at the examples in the various fasm downloads. That should get you started with the basics on each OS.

20 Jan 2009, 13:57

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander 20 Jan 2009, 14:00

Ok, I'll do so for linux, but

my problem is that I want to know something about driver programming under fasm. I think it should be possible with "native". I know how to programm a driver in c or in c++ under windows, but in fasm. Has any thread been opened for this topic?

20 Jan 2009, 14:00

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20638
Location: In your JS exploiting you and your system

revolution 20 Jan 2009, 14:22

There are many many threads here on Windows driver programming. Search and you shall find. Even with example code and working examples.

20 Jan 2009, 14:22

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander 20 Jan 2009, 14:31

Thanks

20 Jan 2009, 14:31

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 20 Jan 2009, 16:01

Unfortunatelly lack of tutorial is reality for FASM.

Be sure to check for extra examples here: http://flatassembler.net/examples.php

Writing drivers is much like writing user apps, except that you have to use different set of system calls, and you have to adhere to bit different rules about what can't be done - but those information are same for all languages (MASM, FASM, C, whatever), so you can easily find them in any C driver tutorial. Are you interested in win32 drivers, or linux kernel modules, or what?

20 Jan 2009, 16:01

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 20 Jan 2009, 18:27

vid,

Yep, KMODE_EXCEPTION_NOT_HANDLED (0x8E) and IRQL_NOT_LESS_OR_EQUAL (0x0A) are famous to catch any step-aside techniques in Win32 KMode.

20 Jan 2009, 18:27

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