firmware/target/arm/system-arm.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Thom Johansen
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include "config.h"
  22 #include "system.h"
  23 #include <stdio.h>
  24 #include "lcd.h"
  25 #include "font.h"
  26
  27 static const char* const uiename[] = {
  28     "Undefined instruction",
  29     "Prefetch abort",
  30     "Data abort",
  31     "Divide by zero"
  32 };
  33
  34 /* Unexpected Interrupt or Exception handler. Currently only deals with
  35    exceptions, but will deal with interrupts later.
  36  */
  37 void __attribute__((noreturn)) UIE(unsigned int pc, unsigned int num)
  38 {
  39     lcd_clear_display();
  40 #ifdef HAVE_LCD_BITMAP
  41     lcd_setfont(FONT_SYSFIXED);
  42 #endif
  43     lcd_puts(0, 0, uiename[num]);
  44     lcd_putsf(0, 1, "at %08x" IF_COP(" (%d)"), pc
  45              IF_COP(, CURRENT_CORE));
  46     lcd_update();
  47
  48     disable_interrupt(IRQ_FIQ_STATUS);
  49
  50     system_exception_wait(); /* If this returns, try to reboot */
  51     system_reboot();
  52     while (1);       /* halt */
  53 }
  54
  55 /* Needs to be here or gcc won't find it */
  56 void __attribute__((naked)) __div0(void)
  57 {
  58     asm volatile (
  59         "ldr    r0, [sp] \r\n"
  60         "mov    r1, #3   \r\n"
  61         "b      UIE      \r\n"
  62     );
  63 }