Re: [Tinycc-devel] help with asm function

[Carlos Montiers]

Thanks.

2014-02-11 21:25 GMT-03:00 Steven G. Messervey <address@hidden>:

Hello. I want learn assembly, and I playing with 16 bit.


I have this little .com file that print the letter Z:


org 100h
mov al, 'Z'
int 29h
ret

But I want use that instruction from a c program with tiny c:
And I have this, but not works:

#include <stdlib.h>
int main()
{
 __asm__ (
  "movl $90,%al\n\t"
  "int $0x29"
 );

 return 0;
}

what is wrong ?

_______________________________________________

There are a few of problems here:
1) tcc is 32 or 64 bits
2) tcc produces Windows EXEs, not COM files
3) The EXEs only work in protected-mode Windows, not real-mode DOS

If you are looking for a 16-bit C toolset:

DJGPP: http://www.delorie.com/djgpp/16bit/
...has instructions for creating a gcc for 8086.
Read the caveats!

OpenWatcom: http://www.openwatcom.org/
...has a complete dev environment, including compiler and assembler,
that will work for 16-bit DOS. The assembler is MASM-like


If you want to develop assembler modules and link them to C, I would
recommend:
fasm (http://flatassembler.net/)

NASM (http://www.nasm.us)

There are probably more, google will help to find them.

Hope This Helps,
  Steve


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