Pelles C forum

Pelles C => General discussions => Topic started by: Supercim on September 26, 2004, 07:14:17 PM

Title: Pelles and asm
Post by: Supercim on September 26, 2004, 07:14:17 PM

Can I use asm in Pelles compiler? If possibile can I see a e example?? Excuse for my English but i'm Italian  :P

Title: Pelles and asm
Post by: Vortex on September 26, 2004, 09:28:43 PM

Hi Supercim,

Welcome to the forum.

There are three methods to use asm with Pelle's C compiler:

i) inline assemby, code from the help file:

Code: [Select]


Examples:
 
__asm
{
   push ebp
   mov  ebp, esp
   sub  esp, __LOCAL_SIZE
}

Alternatively, you can put __asm in front of each assembly instruction:

__asm push ebp
__asm mov  ebp, esp
__asm sub  esp, __LOCAL_SIZE


ii)External asm modules coded with an assembler like Microsoft MASM
iii)asm source files which can be processed by pocc, the compiler. The syntax is similar to Nasm

Title: Pelles and asm
Post by: Supercim on September 27, 2004, 12:01:08 AM

well, but when i compile a example program
#include <stdio.h>

void main(void)
{
   
__asm
  {
     mov ah,02
     mov dl,64
     int 21h
   }
 
}
my win xp crash!!!!
why??? :shock:

Title: Pelles and asm
Post by: dare2 on September 27, 2004, 12:33:36 AM

At a guess: int 21 is DOS, I don't think XP, 2K etc allow it. Need to use API calls instead.

Title: Pelles and asm
Post by: Supercim on September 27, 2004, 11:40:24 AM

Excuse me, but i'm newbie... Can you post a example of API call? thanks

Title: Pelles and asm
Post by: Pelle on September 27, 2004, 06:14:36 PM

Maybe something like this. You need to find documentation about Win32 API calls. This only demonstrates CreateFile (and GetLastError) calls.

Code: [Select]


#define WIN32_LEAN_AND_MEAN
#include <windows.h>

int main(void)
{
    char *filename = "filename.ext";
    HANDLE hf;

    __asm
    {
        push 0                  ; hTemplateFile
        push 0                  ; dwFlagsAndAttributes
        push OPEN_EXISTING      ; dwCreationDisposition (OPEN_EXISTING == 3)
        push 0                  ; lpSecurityAttributes
        push 0x00000001         ; dwShareMode (FILE_SHARE_READ == 0x00000001)
        push 0x80000000         ; dwDesiredAccess (GENERIC_READ == 0x80000000)
        lea eax,[filename]
        push eax                ; lpFileName
        call CreateFileA        ; (CreateFileA == CreateFile ANSI version, CreateFileW == CreateFile Unicode version)
        mov [hf],eax
        cmp eax,-1              ; INVALID_HANDLE_VALUE == -1
        jne open_ok
        call GetLastError
        ; ...
open_ok:
        ; ...
    }
}


Pelle

Title: Pelles and asm
Post by: Supercim on September 27, 2004, 07:30:48 PM

Thank you very much  :D