Segments in Assembler

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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

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i don't hate goto

14 Mar 2006, 20:37

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
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: 8390
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: 7105
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

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