Bonjour,
J'ai un code(ci-dessous) mais je n'ai jamais fais d'assembleur et je ne comprend pas tout.
Je connais le C,C++,python, et ca n'a pas l'aire de ressembler et je suis totalement perdu.
Ce code est extrait du loader de SOS(Simple Operating System).
Est-ce que quelqu'un pourrait m'expliquer ligne par ligne ce que ca fait?
Si jamais ca vous prend trop de temps, dites moi au moins un tutoriel pour apprendre l'assembleur.
/* Copyright (C) 1999 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
/* The operating system is booted by Grub, so we almost have nothing
to do to boot it. We only have to conform to the Multiboot
standard, as defined by the Grub documentation */
#define ASM 1
/* The multiboot.h header contains a lot of multiboot standard
definitions */
#include "multiboot.h"
/* The multiboot header itself. It must come first. */
.section ".multiboot"
/* Multiboot header must be aligned on a 4-byte boundary */
.align 4
multiboot_header:
/* magic= */ .long MULTIBOOT_HEADER_MAGIC
/* flags= */ .long MULTIBOOT_HEADER_FLAGS
/* checksum= */ .long -(MULTIBOOT_HEADER_MAGIC \
+MULTIBOOT_HEADER_FLAGS)
/* header_addr= */ .long multiboot_header
/* load_addr= */ .long __b_kernel
/* load_end_addr=*/ .long __e_load
/* bss_end_addr= */ .long __e_kernel
/* entry_addr= */ .long multiboot_entry
/* Here is the beginning of the code of our operating system */
.text
.globl start, _start
start:
_start:
multiboot_entry:
/* Set up a stack */
movl $(stack + MULTIBOOT_STACK_SIZE), %ebp
movl %ebp, %esp
/* Set EFLAGS to 0 */
pushl $0
popf
/* Push the magic and the address on the stack, so that they
will be the parameters of the cmain function */
pushl %ebx
pushl %eax
/* Call the cmain function (os.c) */
call EXT_C(sos_main)
/* Should never get there */
loop:
hlt
jmp loop
/* Here is the stack */
.comm stack, MULTIBOOT_STACK_SIZE
Merci d'avance, mmaximum