From mboxrd@z Thu Jan  1 00:00:00 1970
From: mikeos@inbox.ru
Subject: Re: Bin and other short question
Date: Tue, 12 Sep 2006 00:06:16 +0400
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On Mon, Sep 11, 2006 at 12:37:26PM -0700, Henio Paszczak wrote:
> Hi.
> I wont to create bin file with using gas haw can i do
> it. 
> ( fir example in nasm its enough to compile with -f
> bin
> nasm -f bin -o * *.asm )
> 
> Scund question is about closing and opening sections.
> If forexample i want to change some thing in section i
> have to create it with "w" index ... is it posible to
> change this state inside section ? for example wfter
> writing what i want to change i wont to close it ...
> just for case ( interupt 125 do something like this ,
> when i used it in .text section it didn'y made any
> changes i mean if i try to write sometning iside i
> recived segmentation error)
> 
> Lukas

You can create bin file such way:

as -o test.o test.s
ld --oformat binary --omagic -Ttext 0x0 -o test test.o

Where option -Ttext sets start of text section,
for other linker's options - man ld