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Ok, I have a free compiler (Borland C++ 5.02) which requires a $125 assembler program (TASM) to do inline assembly. I refuse to pay this; I'd write my own assembler first.
I know there are some freeware assemblers (I own a few, come to think of it) -- can I use one of them assemble to an OBJ that I can link to, and call functions from within, a C/C++ program?
And how do I have to declare the prototypes? extern C?
I downloaded a non-warez TASM for free...want me to email it to you?
oh wait, I don't have it anymore...sorry.
I use nasm and gcc so it possible to use a different assembler
and still link the c code. tasm for dos is easy to
pickup, tasm32 might be harder to find. You also need
to assemble to your compiler's object format I think. Nasm
supports a number of these ,-f elf is what I use on linux.
This should work on linux
Code:/* t.h */
int f(int a, int b);
/* main.c */
#include <stdio.h>
#include "t.h"
int main(void)
{
printf("4 + 3 = %d\n", f(4, 3));
return 0;
}
/* t.asm */
section .text
global f
f:
push ebp
mov ebp, esp
mov eax, [ebp+8] ; eax = a
mov ecx, [ebp+12] ; ecx = b
add eax, ecx ; return in eax
.exit:
leave
ret
t.h should have the extern "c" stuft, that way you
can link with c++ :).
Thanks for the pointers. MASM is still free (it's bundled with some DLs from Microsoft) so I've gotten that, and (eventually) gotten it working.
I just tried out the sample code of yours, and made it work under the compiler (I compiled the rest as C++ so I needed to declare the function as a "C" called function to disable name mangling) -- everything seems all well and good! Thanks!