🚀 go-pugleaf

Gack.

(I should learn to review my messages first).

You write:

   At the lines with "mov ebp,esp" and "xor ebx,ebx" for example I got the
   error message "operands given don't match any known 386 instruction".

What you could do is study the assembler output from gcc.
Using either the -S or -save-temps option, compile a simple .c file
and then study the .s.  This may give you enough of a clue.

I did this on an SCO 3.2v4 system for foo.c and got:

foo.c:
foo(int a, int b) { return a ^ b; }

gcc -O -S foo.c
foo.s:
	.file	"foo.c"
gcc2_compiled.:
__gnu_compiled_c:
.text
	.align 16
.globl foo
foo:
	pushl %ebp
	movl %esp,%ebp
	movl 8(%ebp),%eax
	xorl 12(%ebp),%eax
	movl %ebp,%esp
	popl %ebp
	ret

(If you add the -fomit-frame-pointer option you get):

	.file	"foo.c"
gcc2_compiled.:
__gnu_compiled_c:
.text
	.align 16
.globl foo
foo:
	movl 4(%esp),%eax
	xorl 8(%esp),%eax
	ret