help me is about fasm public command error.

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kerr

Joined: 24 Feb 2016
Posts: 156

kerr 09 May 2017, 03:55

Code:

main:
           public data
data label byte

use fasm compile to public data show error.

public data

processed:public data
error:illegal instruction

i see to fasm.pdf books , public command use is public main .

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09 May 2017, 03:55

kerr

Joined: 24 Feb 2016
Posts: 156

kerr 10 May 2017, 07:41

no friends help me ?

10 May 2017, 07:41

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 10 May 2017, 10:44

'data' is a reserved word. And 'public' is only available with linkable formats.

10 May 2017, 10:44

kerr

Joined: 24 Feb 2016
Posts: 156

kerr 11 May 2017, 01:36

revolution wrote:

'data' is a reserved word. And 'public' is only available with linkable formats.

I don't know.if 'data' is a reserved word.
But I use udata or datas label show error.

Code:

public udata
label udata byte

this code is error.
I don't know is why.

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11 May 2017, 01:36

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 11 May 2017, 02:10

'public' is only available with linkable formats. You have to define a format that is linkable.

Code:

format ELF ;or COFF, or something that is linkable.

11 May 2017, 02:10

kerr

Joined: 24 Feb 2016
Posts: 156

kerr 11 May 2017, 03:01

revolution wrote:

'public' is only available with linkable formats. You have to define a format that is linkable.
Code:
format ELF ;or COFF, or something that is linkable.    

oh
friend but I use is error.
this is masm syntax.

Code:

        PUBLIC uData
uData   LABEL   BYTE
                                                
                                                
Sec9            EQU     BYTE PTR uData+0        
BiosLow         EQU     WORD PTR uData+11
BiosHigh        EQU     WORD PTR uData+13
CurTrk          EQU     WORD PTR uData+15
CurSec          EQU     BYTE PTR uData+17
DirLow          EQU     WORD PTR uData+18
DirHigh         EQU     WORD PTR uData+20

I want with fasm to compile it . But fasm compile to show error.

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11 May 2017, 03:01

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 11 May 2017, 03:16

You have to use 'format'. Without it you just get the default binary format which doesn't support 'public'.

11 May 2017, 03:16

kerr

Joined: 24 Feb 2016
Posts: 156

kerr 11 May 2017, 04:17

revolution wrote:

You have to use 'format'. Without it you just get the default binary format which doesn't support 'public'.

how to do ?

I use format binary .
Sec9 EQU BYTE uData+0
mov di,Sec9

display error: operand sizes do not match.

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11 May 2017, 04:17

revolution
When all else fails, read the source

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Posts: 20299
Location: In your JS exploiting you and your system

revolution 11 May 2017, 04:21

DI is a 16-bit register. You can't load a byte into DI. fasm is showing you the correct error.

Are you trying to load the address or the value?

Code:

mov di,[address] ;load the value stored at address
mov di,address ;load the address

11 May 2017, 04:21

kerr

Joined: 24 Feb 2016
Posts: 156

kerr 11 May 2017, 05:12

revolution wrote:

DI is a 16-bit register. You can't load a byte into DI. fasm is showing you the correct error.

Are you trying to load the address or the value?
Code:
mov di,[address] ;load the value stored at address
mov di,address ;load the address    

No friend.
Your understand error.

code is sec9 equ byte uData+0.

mov di,[sec9] is mov di,[ byte uData+0] this is error.

sec9 = 0x0000+0

mov di, sec9 is move offset address sec9 to di.

i want load the address

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11 May 2017, 05:12

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 11 May 2017, 07:08

You shouldn't have the 'byte ptr"

Code:

Sec9            EQU     uData+0

You,might also consider using a structure.

Code:

struc uData {
        .Sec9           rb 11
        .BiosLow        rw 1
        .BiosHigh       rw 1
        .CurTrk         rw 1
        .CurSec         rb 1
        .DirLow         rw 1
        .DirHigh        rw 1
}
uData uData

mov di,uData
mov al,[di+uData.Sec9]

11 May 2017, 07:08

kerr

Joined: 24 Feb 2016
Posts: 156

kerr 11 May 2017, 08:16

revolution wrote:

You shouldn't have the 'byte ptr"

Code:

Sec9            EQU     uData+0

You,might also consider using a structure.

Code:

struc uData {
        .Sec9           rb 11
        .BiosLow        rw 1
        .BiosHigh       rw 1
        .CurTrk         rw 1
        .CurSec         rb 1
        .DirLow         rw 1
        .DirHigh        rw 1
}
uData uData

mov di,uData
mov al,[di+uData.Sec9]

useing a structure?
the structure can't do data.
Because 'label udata byte' defined void udata label , so useing structure I don't know data Whether right?

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11 May 2017, 08:16

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 11 May 2017, 08:59

Try this with the structure:

Code:

mov ax,[di+uData.Sec9]

You will get an error: operand sizes do not match.

11 May 2017, 08:59

kerr

Joined: 24 Feb 2016
Posts: 156

kerr 12 May 2017, 04:35

revolution wrote:

Try this with the structure:
Code:
mov ax,[di+uData.Sec9]    
You will get an error: operand sizes do not match.

Ok .

thank you!

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12 May 2017, 04:35

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