Question

I need to develop a procedure for Assembly language and call that procedure from C language (pass a string and return an integer value). My assembly procedure works fine “stand-alone”. I need help with connecting them together.

Program is supposed to run on Intel 8086. I need to use MASM or emu8086 as assembler/simulator. Kindly recommend a C compiler and also a way to make the simple C program that is able to call the assembly procedure and get the returned value.

How can I pass a string to this external function?
How can I connect the ASM file and the C file? (How will the compiler know where is the definition/code for this procedure?)
How can I get the string sent from C in Assembly language, also how to return the integer to C?

Answer 1

recommend a C compiler

Not enough info, however if your platform is significant enough, chances are that GCC already supports it.

and also a way to make the simple C program that is able to call the assembly procedure and get the returned value.

The way for writing simple C programs is using a text editor. (Oh wait, you’re interested in the code? Here it goes:

#include <stdio.h>

extern int foo();

int main()
{
    int i = foo();
    printf("%d\n", i);
    return 0;
}