Programming Forums > Application Development > Assembly

Klarre · Aug 17th, 2006, 3:30 PM

I am not sure if I have gotten it correct. But first of all: is dgroup and @data doing the same thing? Second of all: do they keep the adress to the data segment, or what are they?

I have a short piece of code where the first line in the entry function is

(Toggle Plain Text)

mov ax, dgroup

This assembles fine when using this command line

(Toggle Plain Text)

ml.exe file.asm

But when I try to assemble the file to coff object file format, I got an error that tells me that "dgroup is an undefined symbol".

(Toggle Plain Text)

ml.exe /coff file.asm

So my question is: why do I only recieve the error using coff? And is there another way to get the value to my ax register, or alternatively define dgroup?

Thanks for your time!

/Klarre

lostcauz · Aug 17th, 2006, 5:53 PM

coff doesn't handle 16 bit code, nor do I

Edgar · Aug 17th, 2006, 7:21 PM

Quote:

Originally Posted by Klarre

I am not sure if I have gotten it correct. But first of all: is dgroup and @data doing the same thing? Second of all: do they keep the adress to the data segment, or what are they?

Yes try to use @data, but you have to move @data to ds so the following
segment shoud resolve your problem:

mov ax,@data
mov ds,ax ;because you can't move ax direct to your data segment.

Klarre · Aug 18th, 2006, 7:53 AM

Quote:

Originally Posted by Edgar

Yes try to use @data, but you have to move @data to ds so the following
segment shoud resolve your problem:

mov ax,@data
mov ds,ax ;because you can't move ax direct to your data segment.

I does'nt matter which one I use either @data nor dgroup. They are both undefined...

Aug 17th, 2006, 3:30 PM	#1
Klarre Game engine designer Join Date: May 2005 Location: Sweden Posts: 301 Rep Power: 4	dgroup undefined using /coff I am not sure if I have gotten it correct. But first of all: is dgroup and @data doing the same thing? Second of all: do they keep the adress to the data segment, or what are they? I have a short piece of code where the first line in the entry function is (Toggle Plain Text) mov ax, dgroup mov ax, dgroup This assembles fine when using this command line (Toggle Plain Text) ml.exe file.asm ml.exe file.asm But when I try to assemble the file to coff object file format, I got an error that tells me that "dgroup is an undefined symbol". (Toggle Plain Text) ml.exe /coff file.asm ml.exe /coff file.asm So my question is: why do I only recieve the error using coff? And is there another way to get the value to my ax register, or alternatively define dgroup? Thanks for your time! /Klarre __________________ http://www.klarre.se

Aug 17th, 2006, 5:53 PM	#2
lostcauz Hobbyist Programmer Join Date: Nov 2004 Location: 1691 miles East of L.A. Posts: 159 Rep Power: 4	coff doesn't handle 16 bit code, nor do I __________________ -- lostcauz Stepped in what?... Behind whose barn?... I didn't even know they had a cow!

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Programming Forums > Application Development > Assembly

dgroup undefined using /coff