Hello Gtk+ in Linux Assembly Language

# Hello GTK+ in Assembly
#
# as -g asm-gtk.s -o asm-gtk.s.o
# gcc asm-gtk.s.o `pkg-config --libs gtk+-2.0` -g -o test
# ./test
#
# Author: Pengu1n , Date: 20090508
#

.section .data

# Strings
APP_TITLE:
.ascii "GTK+ in ASM\0"

HELLO_ASM:
.ascii "Hello ........ ASM!\0"

BUTTON_CLICKED_INFO:
.ascii "Hello button clicked!\n\0"
.equ BUTTON_CLICKED_INFO_LEN, . - BUTTON_CLICKED_INFO    # '.' means current address

# Constants
.equ GTK_WINDOW_TOPLEVEL, 0
.equ NULL, 0

# GTK+ Signal name
signal_button_clicked:
.ascii "clicked\0"

signal_delete_event:
.ascii "delete_event\0"

.section .bss

.equ WORD_SIZE, 4
.lcomm main_window, WORD_SIZE
.lcomm hello_button, WORD_SIZE

.section .text

.global main
.type main, @function

main:

pushl %ebp
movl  %esp, %ebp   # args is here, but howto get &argc ?

# TODO: pass &argc, &argv to gtk_init
pushl $NULL
pushl $NULL
call  gtk_init
addl  $8, %esp

pushl $GTK_WINDOW_TOPLEVEL
call  gtk_window_new
addl  $4, %esp
movl  %eax, main_window

pushl $APP_TITLE
pushl main_window
call  gtk_window_set_title
addl  $8, %esp

# Setup destory singal handler
pushl $NULL
pushl $NULL
pushl $NULL
pushl $destroy_handler
pushl $signal_delete_event
pushl main_window
call g_signal_connect_data    # g_signal_connect is just a macro,
# so we must call g_signal_connect_data directly
addl $24, %esp

pushl $HELLO_ASM
call  gtk_button_new_with_label
addl  $4, %esp
movl  %eax, hello_button

# Setup destory singal handler
pushl $NULL
pushl $NULL
pushl $NULL
pushl $button_clicked_cb
pushl $signal_button_clicked
pushl hello_button
call g_signal_connect_data
addl $24, %esp

pushl hello_button
pushl main_window
call gtk_container_add
addl  $8, %esp

pushl main_window
call gtk_widget_show_all
addl  $4, %esp

call gtk_main

movl $1, %eax
movl $0, %ebx
int  $0x80

.type destroy_handler, @function
destroy_handler:

pushl %ebp
movl  %esp, %ebp

call gtk_main_quit

movl $0, %eax
leave
ret

.type button_clicked_cb, @function
button_clicked_cb:

pushl %ebp
movl %esp, %ebp

movl $4, %eax          # syscall __NR_write
movl $1, %ebx          # stdout
movl $BUTTON_CLICKED_INFO, %ecx
movl $BUTTON_CLICKED_INFO_LEN, %edx
int $0x80

movl $0, %eax
leave
ret