calling function from other .asm file

[ghjjkl]

Hi there, i'm new in asm. So, how can i call function from other .asm file? I tried just to declare .code derective in that .asm file, put function there, and then added .asm file to files must be linked. Assembling passed nice, but when i start debugging my program using afdpro, a can't recognize any code from that function - it's just called, but nothing more! Sorry for my bad eng, and thaks for attention.

[Vortex]

Here is a quick example for you :

Code Select Expand

include     \masm32\include\masm32rt.inc

MyFunction  PROTO :DWORD

.data

msg         db 'This is a test.',0

.code

start:

    invoke  MyFunction,ADDR msg

    invoke  ExitProcess,0

include     source2.asm

END start


source2.asm :

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MyFunction PROC _text:DWORD

    invoke  szUpper,_text
    invoke  StdOut,_text
    ret

MyFunction ENDP


[ghjjkl]

thank you, but it seems it's wrong way for me, because i assemble dos program... when i add same code construction as you, assembler sends me errors A2034("must be in segment block") and then A1010("unmatched block nesting").

[ghjjkl]

wow, it seems i've found solution.
But one little question more:

Code Select Expand


seg segment
(...)
seg ends
(...)

mov ax,seg
mov ds,ax

(...)

what would be equivalent of this, if i want to send seg as parameter in function?

[Gunther]

Hi ghjjkl,

that's not enough information. Please post the complete code here. In general you can't overwrite a segment register without saving it.

Gunther

[MichaelW]

Also, seg is a MASM reserved word, an operator used to return the segment of an expression.

http://msdn.microsoft.com/en-us/library/fk35xcha.aspx

[Gunther]

Furthermore, it doesn't make much sense to load the segment address of the callee into register DS (data segment). The qualified DOS real mode address of the callee (seggment:offset) must reside in CS:IP.

Gunther

[ghjjkl]

Also, seg is a MASM reserved word, an operator used to return the segment of an expression.

http://msdn.microsoft.com/en-us/library/fk35xcha.aspx

thanks, i'll remember this, i didnt check that code before post

Hi ghjjkl,

that's not enough information. Please post the complete code here. In general you can't overwrite a segment register without saving it.

Gunther

i mean, if i need implement something like this

Code Select Expand


(ONE OF .ASM FILES)

(...)

func proc near c __seg:word
mov ax, __seg
mov ds, ax

(...)

func endp

(...)

(OTHER .ASM FILE)
_seg segment

(...)

_seg ends

(...)

invoke func,???;how should i specify _seg to pass it as parameter(for operations like movsb)? Whether it should be something
               ;like "offset _seg" or simply "_seg"?

(...)

hope you will get it...

[Gunther]

Hi ghjjkl,

I see. You can of course pass the segment address of a procedure to another procedure. But why would you like to load that code segment address into register DS?

Gunther

[ghjjkl]

i've edited my example...
i need just to send segment as parameter, but when i try "invoke func,_seg", assembler stops with error "error A2001: immediate operand not allowed"
That segment doesnt contains any code, but data only...

[Gunther]

Please give me a little bit time, to prepare an example for you.

Gunther

[nidud]

deleted

[nidud]

deleted

[Gunther]

Hi ghjjkl,

you can try nidud's example and/or my example in the archive sevseg.zip. It'll assemble with MASM, jWasm or TASM.

Gunther

[ghjjkl]

aw thanks so! Hope i'll manage to remember it