structures

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Ralph

Joined: 04 Oct 2003
Posts: 86

Ralph 08 Oct 2003, 20:57

Hey,
This is possibly a dumb question to ask, but I haven't been able to find an answer myself. I'm trying to use structures in my code, but I keep getting errors. For example, right now I'm struggling with this:

Code:

STRUC InterruptDscr ID1,ID2,ID3,ID4 {
      .Offset0_15   DW ID1  ;low word of int offset
      .Selector0_15 DW ID2  ;segment selector
      .NullByte     DB      ;unused
      .Flags        DB ID3  ;flags
      .Offset16_31  DW ID4  ;high word of int offset
}

IDTInt00 InterruptDscr 10000,8,0F1h,1

When I try to assemble that I get:
IDTInt00 InterruptDscr 10000,8,0F1h,1
error: illegal instruction.

I've been able to use other structures in the same manner, so I really have no idea what I'm doing wrong.

08 Oct 2003, 20:57

Dunduk

Joined: 08 Sep 2003
Posts: 38
Location: Russia

Dunduk 09 Oct 2003, 02:55

Ralph wrote:

Code:

When I try to assemble that I get:
       IDTInt00 InterruptDscr 10000,8,0F1h,1
error: illegal instruction.

Hmmm, and I get:

Code:

    .NullByte     DB   ;unused
error: invalid argument.

I think you have to define so many arguments as many structure members. It works. Or maybe you have to write your own macro struc. How do do this I don't know... But wizard Privalov do, I believe Wink

09 Oct 2003, 02:55

Ralph

Joined: 04 Oct 2003
Posts: 86

Ralph 09 Oct 2003, 03:41

Thanks, that worked. Now I have a second question though. Does fasm have a HIGH/LOW directive similar to tasm? To be more specific, I need to store the high word of a dword address using DW, as in:

Code:

Label:
;code

Blah DW Label HIGH16
Blah DW Label LOW16

Any ideas?

09 Oct 2003, 03:41

Dunduk

Joined: 08 Sep 2003
Posts: 38
Location: Russia

Dunduk 09 Oct 2003, 04:43

Ralph wrote:

Thanks, that worked. Now I have a second question though. Does fasm have a HIGH/LOW directive similar to tasm? To be more specific, I need to store the high word of a dword address using DW, as in:
Code:
Label:
;code

Blah DW Label HIGH16
Blah DW Label LOW16
    
Any ideas?

Maybe you should use "virtual"?
Try this:

Code:

Blah dd ?
virtual at Blah
  LOW16  dw ?
  HIDH16 dw ?
end virtual

Something like this if I understand right. It would work I think. It is from fasm documentation... And I didn't work with tasm (shame on me Embarassed

)

09 Oct 2003, 04:43

scientica
Retired moderator

Joined: 16 Jun 2003
Posts: 689
Location: Linköping, Sweden

scientica 09 Oct 2003, 06:20

Dunduk wrote:

Hmmm, and I get:

Code:

    .NullByte     DB   ;unused
error: invalid argument.

Put a ? after the db, and that error should be killing the error.

Code:

STRUC InterruptDscr ID1,ID2,ID3,ID4 {
      .Offset0_15   DW ID1  ;low word of int offset
      .Selector0_15 DW ID2  ;segment selector
      .NullByte     DB ?    ;unused
      .Flags        DB ID3  ;flags
      .Offset16_31  DW ID4  ;high word of int offset
}
IDTInt00 InterruptDscr 10000,8,0F1h,1

_________________
... a professor saying: "use this proprietary software to learn computer science" is the same as English professor handing you a copy of Shakespeare and saying: "use this book to learn Shakespeare without opening the book itself.
- Bradley Kuhn

09 Oct 2003, 06:20

Dunduk

Joined: 08 Sep 2003
Posts: 38
Location: Russia

Dunduk 09 Oct 2003, 08:09

scientica wrote:

Put a ? after the db, and that error should be killing the error.

Oh, sure! I must upgrade my brains again...

09 Oct 2003, 08:09

Ralph

Joined: 04 Oct 2003
Posts: 86

Ralph 09 Oct 2003, 23:31

Thanks for the responses. I got working.

09 Oct 2003, 23:31

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