mainGAS AS End User Help - Summary

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Id: #4065
System Name: gas-user
Name: GAS AS End User Help
Group Type: non-GNU software and documentation

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This project is not part of the GNU Project.

Though there is a full manual for AS/GAS located at:

and man pages are available at the prompt:

URQUART> man as

there will always be issues that are either not clear or not
covered in the manual. These pages will attempt to clarify and
enlighten the AS/GAS user by providing examples and dialog from
and between the actual users of this assembler.
   Hopefully this page will become an invaluable aid for developing
and understanding the use of this fine cross assembly tool.
   Everyones input and personal experiences are welcome.

   This page was started Wednesday July 06 2005.

Registration Date: Tue 04 Mar 2003 01:51:48 AM UTC
License: GNU Free Documentation License
Development Status: 0 - Undefined


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BASIC LESSON #1 The .fill directive......and more
     posted by pwillis, Thu 13 Mar 2003 04:28:04 AM UTC - 0 replies

--How to use the '.fill' assembler directive--

   I want to make a file exactly 512 bytes
and I want to put the boot signature at
the end of the file. So, how do I fill this
space automaticly without having to manually count
fill bytes? ...

[Read more]
PowerPC AS example
     posted by pwillis, Mon 10 Mar 2003 01:30:42 AM UTC - 0 replies

Information regarding powerPC assembly with sample listings
in AS/GAS format. Follow the link.,lnxw16=PowPC


Another Boot Sector
     posted by pwillis, Sun 09 Mar 2003 11:11:01 PM UTC - 0 replies

After posting on:


Ben Peddell offered his own boot sector code as an example.
Located at:

Ben states:
" It was actually based on MS Windows 98's FAT16 and FAT32 boot sectors. ...

[Read more]
     posted by pwillis, Fri 07 Mar 2003 04:33:20 AM UTC - 3 replies

I got some boot code from:

and I have been going through it.
I've edited the code up to the /*..BREAK..*/ line
so far.


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