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Necromancer13.13



Joined: 20 Apr 2008
Posts: 15
Location: Ukraine
Necromancer13.13
I'm trying to assemble this:

Code:
format COFF
start:
        mov     ah,9
        mov     dx,mess
        int     21h
        mov     ah,10h
        int     16h
        int     20h
        mess    db 'Hello World!',0Dh,0Ah,'$'
    


But I get : mov dx,mess: invalid use of symbol.
and When I add "org 100h" then there is no error.
Is it normal that fasm doesn't assemble it without org 100h?

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FASM Rules!
Post 26 Aug 2008, 17:37
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
TFM wrote:
2.4.3 Common Object File Format

To select Common Object File Format, use format COFF or format MS COFF directive whether you want to create classic or Microsoft's COFF file. The default code setting for this format is 32-bit. To create the file in Microsoft's COFF format for the x86-64 architecture, use format MS64 COFF setting, in such case long mode code is generated by default.


By using EDX instead of DX also solves the problem but, is this really a DOS program? Why are you using COFF instead of direct COM or MZ?
Post 26 Aug 2008, 17:50
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Necromancer13.13



Joined: 20 Apr 2008
Posts: 15
Location: Ukraine
Necromancer13.13
I just try to get binary file like COM file but without org 100h
Post 26 Aug 2008, 17:56
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
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revolution
COFF is not binary, it is an intermediate format intended for a linker to read.
Post 26 Aug 2008, 18:02
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Necromancer13.13



Joined: 20 Apr 2008
Posts: 15
Location: Ukraine
Necromancer13.13
Oh.. I wanted to say that I want to get the COFF file and than link it with LINKER to binary.. is it possible? Smile
Post 26 Aug 2008, 18:12
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
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revolution
Why not just use "format binary"?
Post 26 Aug 2008, 18:15
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asmcoder



Joined: 02 Jun 2008
Posts: 784
asmcoder
[content deleted]


Last edited by asmcoder on 14 Aug 2009, 14:56; edited 1 time in total
Post 26 Aug 2008, 18:29
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17287
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revolution
asmcoder wrote:
what is linker?
Have I introduced you to my website yet?
Post 26 Aug 2008, 18:30
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Necromancer13.13



Joined: 20 Apr 2008
Posts: 15
Location: Ukraine
Necromancer13.13
Quote:
Why not just use "format binary"?

Because I think, that it's better to use object files when writing a big project.

Quote:
what is linker?

Hm... I don't know what linker can do it... May be ld86, LINK16 or Unilink.
Post 26 Aug 2008, 19:31
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edfed



Joined: 20 Feb 2006
Posts: 4238
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edfed
a linker is something (prehistoric) useless.
fasm does it transparently.
Post 26 Aug 2008, 19:39
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
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Location: In your JS exploiting you and your system
revolution
Necromancer13.13 wrote:
Quote:
Why not just use "format binary"?

Because I think, that it's better to use object files when writing a big project.
If you are mixing tools (like C & assembly) then a linker is usually needed. But just using the size of the project would seem to be a bad metric to use to decide upon using a linker. Any extra step that may not be needed could be a waste of effort. A better metric might be whether it is needed. Wink
Post 26 Aug 2008, 19:44
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
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vid
Quote:
If you are mixing tools (like C & assembly) then a linker is usually needed. But just using the size of the project would seem to be a bad metric to use to decide upon using a linker. Any extra step that may not be needed could be a waste of effort. A better metric might be whether it is needed.

Ever tried recompiling 2MB C code after every small change?
Post 27 Aug 2008, 05:56
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17287
Location: In your JS exploiting you and your system
revolution
vid wrote:
Quote:
If you are mixing tools (like C & assembly) then a linker is usually needed. But just using the size of the project would seem to be a bad metric to use to decide upon using a linker. Any extra step that may not be needed could be a waste of effort. A better metric might be whether it is needed.

Ever tried recompiling 2MB C code after every small change?
One presumes it takes a long time. If so then that can fit into the needed category. I don't see the problem.
Post 27 Aug 2008, 07:40
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