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Index > Compiler Internals > Porting FASM

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Night Rider



Joined: 28 Jul 2005
Posts: 72
Night Rider
Hi, All!
Can anybody explain mesuch thing. I am writing new OS and want to port FASM there. Can i do this (i mean rights for compiler) - if i will keep license file etc, but i need to rewrite some parts of code.
Is it legal to do so?

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My best regards
Post 30 Jul 2005, 19:12
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Night Rider



Joined: 28 Jul 2005
Posts: 72
Night Rider
Nobody can answer such simple question? Please...
Post 30 Jul 2005, 23:27
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mike.dld



Joined: 03 Oct 2003
Posts: 235
Location: Belarus, Minsk
mike.dld
If you mean parts like SYSTEM.INC or FASM.ASM then it's okay Smile As for platform-independent part of assembler, ask someone else Wink
Post 30 Jul 2005, 23:38
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crc



Joined: 21 Jun 2003
Posts: 637
Location: Penndel, PA [USA]
crc
You can modify it and distribute modified versions as long as you follow the restrictions detailed in the license.txt that you get when you download fasm.
Post 31 Jul 2005, 00:04
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decard



Joined: 11 Sep 2003
Posts: 1095
Location: Poland
decard
To port fasm to your os you have to modify system.inc and fasm.asm (as mike.dld wrote). These files provide an interface to an operating system. You have to put OS specific routines (reading from files, displaying text, etc...) in system.inc file. It would be easier if you copy these two files from win32 distribution and modify them.
Post 31 Jul 2005, 08:25
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Night Rider



Joined: 28 Jul 2005
Posts: 72
Night Rider
Thank you!
Post 31 Jul 2005, 14:07
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7496
Location: Kraków, Poland
Tomasz Grysztar
The attachments contains the copy of the never finished guide to the flat assembler internals, slightly updated to cover the latest releases.
The second chapter is however complete, and this is the one that should help you in porting fasm to any new operating system.


Description: The official guide to flat assembler internals
Download
Filename: fasmguide.zip
Filesize: 11.39 KB
Downloaded: 1378 Time(s)

Post 31 Jul 2005, 14:35
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Is this attachment the most newer version of the guide?
Post 29 Aug 2007, 20:49
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Unless there is another version outside this forum, this one is the last release of the guide.
Post 30 Aug 2007, 22:40
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fabbel



Joined: 30 Oct 2012
Posts: 10
fabbel
Thomas, can u find some spare time to update this fasm1 guide ? Would be much much much appreciated.. it's almost 14years old now.. and i want to tinker with fasm engine.. unfort lots of information are missing in there : typ. description of parsing, assembly, formatting stages (am particularly interested to see how virtual feature work internally, how it could be extended to include relocations in the case of PE format)
Thx
Rgds
Post 19 Feb 2019, 10:47
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7496
Location: Kraków, Poland
Tomasz Grysztar
This old engine is kind of a mess, its internal structures have been expanded so many times (including recent back-porting of VIRTUAL-related features from fasmg) that it became a bit like a patchwork. It is not easy to convince me to get back to analyzing it when I have a much more cleaner world of fasmg to spend my time in. Wink

On the other hand, I still own a notebook where I designed all the data structures used internally by fasm 1. I might consider digitizing it one day... Several structures have already been described in the fas format documentation.
Post 19 Feb 2019, 10:54
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16903
Location: In your JS exploiting you and your system
revolution
Tomasz Grysztar wrote:
On the other hand, I still own a notebook where I designed all the data structures used internally by fasm 1. I might consider digitizing it one day... Several structures have already been described in the fas format documentation.
If by digitising it you mean to replace all the raw numbers with symbolic constants that would be a significant improvement. Idea
Post 19 Feb 2019, 11:26
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7496
Location: Kraków, Poland
Tomasz Grysztar
revolution wrote:
If by digitising it you mean to replace all the raw numbers with symbolic constants that would be a significant improvement. Idea
I attempted this several times in the past (not recently, though). Each time I had to abort after realizing that I've been using some of the values with multiple meanings. You know, like Mel would do. Wink

Nevertheless, in the fasmg development I have in fact found a good way to handle this kind of problems - with the ASSERT directive. When I'm going to use some offset or a constant in such way that changing the original definition of structure or constant would break things, I simply add an ASSERT that is going to signalize the problem. There are many such clauses throughout fasmg source.

So yeah, with this new approach I could most likely succeed in rewriting fasm's source in such way if I attempted it. The only problem now is, as I wrote above, to somehow make me work on fasm 1 source when I so much prefer to dedicate the same time to fasmg-related things. Wink
Post 19 Feb 2019, 12:15
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16903
Location: In your JS exploiting you and your system
revolution
Tomasz Grysztar wrote:
So yeah, with this new approach I could most likely succeed in rewriting fasm's source in such way if I attempted it. The only problem now is, as I wrote above, to somehow make me work on fasm 1 source when I so much prefer to dedicate the same time to fasmg-related things. Wink
Maybe there could be a guide on how Tomasz can migrate from fasmg to fasm. You would experience much faster assembly times, so testing is much easier and faster. Razz
Post 19 Feb 2019, 16:26
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