Re: [Dev-C++] interupting registers using [DEV-C++]

[Daniel K. O. <dan...@ya...>]

AFRO MEISTER wrote:

> I have been trying to generate graphics and found a tutorial that 
> contained information on interupting a graphics register using 
> assembly in order to create graphics, but I have come across the 
> problem that DEV-C++ does not use Intel assebly whereas my tutorial 
> does. here is the function that it uses to "turn on" graphics 
> capabilities:
>
> void SetMCGA()
>  {
>     _AX = 0x0013;
>     geninterrupt (0x10);
>   }
>

Dev-C++ uses MinGW, that generates Win32 code. You can't do those 
low-level stuffs in the Win32 environment. You probably want to use 
DJGPP, if you wanna play with interrupting and other 
assembly-directly-on-hardware stuffs.

Or, if you wanna try to learn things for real-life, use libraries like 
Allegro or SDL (there are devpaks for both).


About the Intel vs AT&T syntax, I'll quote myself from a previous message:


----------------
First: GCC uses AT&T syntax by default, but it accepts Intel as well.

You can set which syntax you want to use by default, with the "-masm=x" 
compiler option, where "x" can be:
   "att" -> for AT&T syntax
   "intel" -> for Intel syntax (d'oh....)

So, with -masm=intel you can write:

---
char hello[] = "Hello";

__asm(
   "mov ebx, _hello \n"
   "more intel asm here... \n"
);
---

And with -masm=att (the default) you can do:

---
char hello[] = "Hello";

__asm(
   "mov $_hello, %ebx \n"
   "more at&t asm here... \n"
);
---


If you want to mix ASM code, you can use ".intel_syntax" and 
".att_syntax" to change the syntax for the next lines. Just don't 
forget  to change it back to the default syntax:

Option -> -masm=att
---
char hello[] = "Hello";

__asm(
               ".intel_syntax \n"
               "mov ebx, _hello \n"
               "more intel asm here... \n"

               ".att_syntax \n" // back to default syntax
);
---


Also, check:
http://www.codeproject.com/useritems/gccasm.asp
And also the Dev-Cpp's FAQ.
------------------







Daniel K. O.