flat assembler
> Linux > How to call GTK 3 functions with FASM? |
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Hello
I'm currently learning assembler (FASM) for fun, so I started to rewrite some of my C programs. I have program which uses GTK, it creates status icon: main.c ===== Code: ... int main(void) { gtk_init(0, 0); // Status icon GtkStatusIcon *status_icon = gtk_status_icon_new_from_icon_name("exit"); g_signal_connect(status_icon, "button-press-event", G_CALLBACK(on_button_press), 0); // main loop gtk_main(); return 0; } and now I'm trying to translate above to assembler. Right now I got this: main.asm ======== Code: ... main: push 0 push 0 call gtk_init add esp, 8 push status_icon_stock call gtk_status_icon_new_from_icon_name add esp, 4 mov eax, [status_icon] push 0 push 0 push 0 push on_button_press push button_press_event push [status_icon] call g_signal_connect_data add esp, 24 call gtk_main status_icon dd 0 exit_dialog dd 0 vbox dd 0 exit_button dd 0 status_icon_stock db 'exit', 0 clicked_str db 'clicked', 0 application_exit_stock db 'application-exit', 0 button_press_event db 'button-press-event', 0 But when I try to run it I get error saying that status_icon is NULL. Why my C code is working and assembly is not? Am I missing something? mov eax, [status_icon] does not put valid pointer in status_code variable? Full code can be viewed here: https://github.com/4544fa8d/i3-exit thanks |
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22 Mar 2016, 08:58 |
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I think you forgot to save the handle:
Code: ;... call gtk_status_icon_new_from_icon_name mov [status_icon],eax ;<--- save the handle here add esp, 4 ;... |
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22 Mar 2016, 09:23 |
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Och, I switched places of source and destination, I don't know how could have I missed it
 .
Thanks Now I moved forward and have another error: Code: on_button_press: ... cmp eax, GTK_RESPONSE_CLOSE jne return mov eax, 11 ;sys_execve mov ebx, dbus_filename mov ecx, dbus_shutdown_args mov edx, 0 int 80h call gtk_main_quit return: push [exit_dialog] call gtk_widget_destroy add esp, 4 ; int 03h ret ; <- Segmentation fault (core dumped) int 03h main: ... push 0 push 0 push 0 push on_button_press push button_press_event push [status_icon] call g_signal_connect_data add esp, 24 call gtk_main Breakpoint show that "segmentation fault" on ret instruction in my "on_button" function. How can I return from on_button function? Full updated code is at: https://github.com/4544fa8d/i3-exit thanks |
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22 Mar 2016, 15:26 |
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So I expect you have some stack corruption in there somewhere. You didn't show all the code* so I can only guess.
* I see the github link. Not going there, sorry. |
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23 Mar 2016, 05:14 |
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Code: format ELF extrn gtk_init extrn gtk_main extrn gtk_button_set_always_show_image extrn gtk_status_icon_new_from_icon_name extrn gtk_window_set_default_size extrn gtk_image_new_from_icon_name extrn gtk_dialog_run extrn gtk_main_quit extrn gtk_button_set_image extrn gtk_widget_destroy extrn gtk_widget_show_all extrn gtk_dialog_response extrn gtk_button_new extrn gtk_dialog_get_content_area extrn gtk_dialog_new extrn gtk_box_pack_start extrn g_signal_connect_data sys_execve = 11 GTK_RESPONSE_CLOSE = -7 GTK_ICON_SIZE_DIALOG = 6 public main on_exit_button: push GTK_RESPONSE_CLOSE push [exit_dialog] call gtk_dialog_response add esp, 8 ret on_button_press: call gtk_dialog_new mov [exit_dialog], eax push [exit_dialog] call gtk_dialog_get_content_area add esp, 4 mov [vbox], eax push 300 push 300 push [exit_dialog] call gtk_window_set_default_size add esp, 12 call gtk_button_new mov [exit_button], eax push 1 push [exit_button] call gtk_button_set_always_show_image add esp, 8 push GTK_ICON_SIZE_DIALOG push application_exit_stock call gtk_image_new_from_icon_name add esp, 8 push eax push [exit_button] call gtk_button_set_image add esp, 8 push 0 push 0 push 0 push on_exit_button push clicked_str push [exit_button] call g_signal_connect_data add esp, 24 push 5 push 1 push 1 push [exit_button] push [vbox] call gtk_box_pack_start add esp, 20 push [vbox] call gtk_widget_show_all add esp, 4 push [exit_dialog] call gtk_dialog_run add esp, 4 cmp eax, GTK_RESPONSE_CLOSE jne return mov eax, 11 ;sys_execve mov ebx, dbus_filename mov ecx, dbus_shutdown_args mov edx, 0 int 80h call gtk_main_quit return: push [exit_dialog] call gtk_widget_destroy add esp, 4 ; int 03h ret ; <- Segmentation fault (core dumped) int 03h main: push 0 push 0 call gtk_init add esp, 8 push status_icon_stock call gtk_status_icon_new_from_icon_name add esp, 4 mov [status_icon], eax push 0 push 0 push 0 push on_button_press push button_press_event push [status_icon] call g_signal_connect_data add esp, 24 call gtk_main status_icon dd 0 exit_dialog dd 0 vbox dd 0 exit_button dd 0 status_icon_stock db 'exit', 0 clicked_str db 'clicked', 0 application_exit_stock db 'application-exit', 0 button_press_event db 'button-press-event', 0 dbus_filename db 'dbus-send', 0 dbus_shutdown_args db '--system --print-reply --dest=\"org.freedesktop.ConsoleKit\" /org/freedesktop/ConsoleKit/Manager org.freedesktop.ConsoleKit.Manager.Stop', 0 |
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23 Mar 2016, 10:22 |
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At first glance there does not appear to be anything obvious wrong.
You can try a few things though. Check that the stack pointer the same upon entry and just before the ret. And/or, simplify the entire procedure to just a ret (or maybe some minimal instructions) and see if that exhibits the same problem. |
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25 Mar 2016, 04:51 |
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hasty post deleted [after posting I saw dbus_shudown_args had already been fixed]
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07 Apr 2016, 18:12 |
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