Fasm Directive

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DJ Mauretto

Joined: 14 Mar 2007
Posts: 464
Location: Rome,Italy

DJ Mauretto 03 Jan 2009, 12:49

Hello,
There is some fasm directive to put Low and High part of 32 bit offset address
in memory location declared as word ?
Example:

Code:


use32
Label_32:

;-----------------
; IDT Structure
;-----------------

Low          DW Label_32 AND 0FFFFH                  ; 15:0 Offset
Selector     DW ?
Other        DB ?
Other2       DB ?
High         DW Label_32 SHR 16                       ; 31:16 Offset

I use this code and work fine but i don't have ever learn
fasm directive and so on ,i have improvised this code and
immediately it's working fine,there is some more specific ?
This is for my hobby OS that i have started some time ago,
i always coded in MASM ,but i have choice FASm for code my toy OS Smile

_________________
Nil Volentibus Arduum Razz

03 Jan 2009, 12:49

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20522
Location: In your JS exploiting you and your system

revolution 03 Jan 2009, 12:53

No. There is no low or high in fasm syntax.

03 Jan 2009, 12:53

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 03 Jan 2009, 12:59

The way you do it is the right way. Just be warned that if you compile to certain formats (MS COFF, PE, ELF, etc...), this might not work, because the format doesn't support such relocation.

03 Jan 2009, 12:59

DJ Mauretto

Joined: 14 Mar 2007
Posts: 464
Location: Rome,Italy

DJ Mauretto 03 Jan 2009, 13:02

Thanks vid for warning , don't worry this is pure flat
binary ,it's for my personal toy OS

_________________
Nil Volentibus Arduum Razz

03 Jan 2009, 13:02

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