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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?

Bo Persson
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user1969973
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1 Answers1

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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;
}
  • Thank you for the prompt reply. Yes this is exactly what i need. Just a few clarifications/suggestions. Sorry for not providing sufficient information in the first place. 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? THANK YOU SO MUCH! – user1969973 Jan 11 '13 at 12:43
  • @user1969973 You read a C tutorial before asking? `foo("HelloWorld");` –  Jan 11 '13 at 12:45