Segments in Assembler

flat assembler
Message board for the users of flat assembler.

Index > Linux > Segments in Assembler

Author

Thread

flash

Joined: 11 Mar 2006
Posts: 55
Location: Cuba

flash 14 Mar 2006, 20:37

Hello:
in masm, you can write ES:[DI] to indicate the position DI inside the segment ES. Flat assembler accept [ES:DI] but there is no way I can well indicate values for ES. Embarassed

My ask: how can I read ot get the segment value in fasm? Some thing like
mov ES, SEGMENT name
Thanks..!!! Wink

_________________
i don't hate goto

14 Mar 2006, 20:37

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7103
Location: Slovakia

vid 14 Mar 2006, 21:13

Code:

mov es, name

FASM is FLAT assembler, segment name is just special kind of label

14 Mar 2006, 21:13

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8466
Location: Kraków, Poland

Tomasz Grysztar 14 Mar 2006, 22:47

You perhaps forgot that there is no "mov segreg,imm" instruction, use "mov segreg,reg" instead. Like:

Code:

mov ax,name
mov es,ax

Alternatively:

Code:

push name
pop es

But why is this thread in Linux forum?

14 Mar 2006, 22:47

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7103
Location: Slovakia

vid 15 Mar 2006, 00:04

oh...

15 Mar 2006, 00:04

flash

Joined: 11 Mar 2006
Posts: 55
Location: Cuba

flash 15 Mar 2006, 04:31

Thanks, Grysztar. I create this thread because need it for Linux AND DOS. Thanks again

15 Mar 2006, 04:31

viki

Joined: 03 Jan 2006
Posts: 40
Location: Czestochowa, Poland

viki 14 Jul 2006, 08:12

But still it is not clear for me. Please look at this code

Code:

 
   org 100h
    push ala
    pop  ds
    mov  ax,word ptr ala
    ret

ala dw 5

the result is wrong because in this (mov ax,word ptr ala) instruction this ds ser register is used. And I and probably flash want to know how to get the correct ds if we loose it. It should be equal to cs? Sorry about my ignorance.

14 Jul 2006, 08:12

UCM

Joined: 25 Feb 2005
Posts: 285
Location: Canada

UCM 14 Jul 2006, 15:37

Since you are creating a COM file, CS should be equal to DS, so:

Code:

org 100h
push cs
pop ds
mov ax,word ptr ala

ala dw 5

should be what you want.

14 Jul 2006, 15:37

viki

Joined: 03 Jan 2006
Posts: 40
Location: Czestochowa, Poland

viki 15 Jul 2006, 06:52

thanks ucm

15 Jul 2006, 06:52

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum