preprocesser directives (AT&T syntax vs FASM)

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royce

Joined: 01 Sep 2012
Posts: 7

royce 02 Sep 2012, 00:22

I guess I must have overlooked the info on the preprocessor directives
Primarilly interested in one to change the syntax of operands.
source first, destination second
Royce

02 Sep 2012, 00:22

freecrac

Joined: 19 Oct 2011
Posts: 117
Location: Germany Hamburg

freecrac 04 Sep 2012, 17:59

I search for parameter order and it seems to be there is no direcrive to specify the parameter order for to switch to the AT&T syntax. But i am not sure.

https://secure.bluehost.com/~flatasse/subdomains/board/topic.php?p=82490

http://en.wikipedia.org/wiki/X86_assembly_language

Quote:

AT&T Syntax
Parameter order: Source before the destination.

Intel Syntax
Parameter order: Destination before source.

Dirk

04 Sep 2012, 17:59

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 05 Sep 2012, 06:34

There is no such directive in FASM. I know only one assembler that supports AT&T syntax - GAS and it was forced to support Intel syntax, because no one liked AT&T. Very Happy

05 Sep 2012, 06:34

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system

revolution 05 Sep 2012, 06:42

JohnFound wrote:

... because no one liked AT&T.

Hehe, people don't like AT&T (the company)?

And the asm syntax that AT&T designed is also an abomination for humans to read.

05 Sep 2012, 06:42

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 05 Sep 2012, 07:18

The only thing I know about AT&T is that they invented stupid x86 assembly syntax and somehow succeeded to promote it to the Unix world, thus making assembly programming for Unix and Linux really hard for many years.

05 Sep 2012, 07:18

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 05 Sep 2012, 08:03

AT&T sucks dick. Their internet is a piece of shit and they are fucking scammers. Money hungry bitches. fuck them all.

05 Sep 2012, 08:03

royce

Joined: 01 Sep 2012
Posts: 7

royce 05 Sep 2012, 09:44

This line of text comes from fasm.txr:
Flat assembler by default uses the Intel syntax for
the assembly instructions, although you can customize
it using the preprocessor capabilities
(macroinstructions and symbolic constants).
Implying that there is a directive/macro or someway to switch it.
Royce

05 Sep 2012, 09:44

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system

revolution 05 Sep 2012, 09:56

Here you go:

Code:

irp op,mov,add,sub,xor { ; <--- add more opcodes here
    macro op source,dest \{
               op dest,source
      \}
}

You can extend the opcode list for whatever you need.

05 Sep 2012, 09:56

royce

Joined: 01 Sep 2012
Posts: 7

royce 06 Sep 2012, 00:38

Thanks for the code.
Royce

06 Sep 2012, 00:38

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