Since there is not offical reference,I got only one tutorial
<a href="http://www.gnupascal.de/contrib/misc/gpcasm.zip"> gpcasm.zip </a>.But when I try to follow the tut and try the inline assembly example on my debian.The gpc was not happy with it.
<pre>
gnu_asm.pas : In procedure 'MyStupidDelay':
gnu_asm.pas:3: error : can't find a register in class AREG while reloading asm
</pre>

Here is the code

    program gnu_asm;
    Procedure MyStupidDelay(time : integer);
    Begin
     Asm("0 : pushl $0xfffff
       1 : decl(%%esp)
         jnz 1b
        addl $0x4, %%esp
        decl %%eax
        jnz 0b"
        :
        : "a" (time)
        : "eax" );
    end;
   
    begin
     write("only for test");
    end.

Another question,are there any other refernece, tutorials, examples on inline assembly in gnu pascal.

thanks.