problems with linking C with FASM

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decard

Joined: 11 Sep 2003
Posts: 1092
Location: Poland

decard 26 Feb 2004, 22:50

Recently some people were asking about linking C objects with FASM code. I was making some experiments, but I met some problems when I was trying to call some C routine inside assembly source. See:

c source:

Code:

#include <stdio.h>

extern int multiply(int,int);

void ppp()
{
 printf("dsadasd");
}

int main()
{
  int result;
 result = multiply(0, 0);
    printf("the result is: %d", result);
  return 0;
}

assembly source:

Code:

format COFF
include "%fasminc%/macro/cdecl.inc"

public multiply as "_multiply"
extrn "_ppp" as ppp:dword


section '.text' code

cproc multiply, a,b
        enterc
        push    edx
        call    ppp
        mov     eax,[a]
        mov     edx,[b]
        mul     edx
        pop     edx
        retc

and it produces very strange results. What's wrong? Maybe it is me that does something in a wrong way? Confused

regards

26 Feb 2004, 22:50

Vortex

Joined: 17 Jun 2003
Posts: 318

Vortex 02 Mar 2004, 10:51

Which C compiler are you using?

To use Fasm with MS VC++ , have a look at:

http://board.flatassembler.net/topic.php?t=1095

_________________
Code it... That's all...

02 Mar 2004, 10:51

decard

Joined: 11 Sep 2003
Posts: 1092
Location: Poland

decard 02 Mar 2004, 11:45

Actually I'm using GCC. But I will take a look, maybe I will find some solution Wink

02 Mar 2004, 11:45

decard

Joined: 11 Sep 2003
Posts: 1092
Location: Poland

decard 02 Mar 2004, 15:43

Hi Vortex,
The problem is that in your code assembly module doesn't require any C function. I have no problem when calling asm from C, but I can't make it work in "both ways".

regards

02 Mar 2004, 15:43

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