lib_m68k/traps.c

   1 /*
   2  * (C) Copyright 2003
   3  * Josef Baumgartner <josef.baumgartner@telex.de>
   4  *
   5  * (C) Copyright 2000
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <watchdog.h>
  29 #include <command.h>
  30 #include <asm/processor.h>
  31
  32
  33 extern void _exc_handler(void);
  34 extern void _int_handler(void);
  35
  36 static void show_frame(struct pt_regs *fp)
  37 {
  38         printf ("Vector Number: %d  Format: %02x  Fault Status: %01x\n\n", (fp->vector & 0x3fc) >> 2,
  39                 fp->format, (fp->vector & 0x3) | ((fp->vector & 0xc00) >> 8));
  40         printf ("PC: %08lx    SR: %08lx    SP: %08lx\n", fp->pc, (long) fp->sr, (long) fp);
  41         printf ("D0: %08lx    D1: %08lx    D2: %08lx    D3: %08lx\n",
  42                 fp->d0, fp->d1, fp->d2, fp->d3);
  43         printf ("D4: %08lx    D5: %08lx    D6: %08lx    D7: %08lx\n",
  44                 fp->d4, fp->d5, fp->d6, fp->d7);
  45         printf ("A0: %08lx    A1: %08lx    A2: %08lx    A3: %08lx\n",
  46                 fp->a0, fp->a1, fp->a2, fp->a3);
  47         printf ("A4: %08lx    A5: %08lx    A6: %08lx\n",
  48                 fp->a4, fp->a5, fp->a6);
  49 }
  50
  51 void exc_handler(struct pt_regs *fp) {
  52         printf("\n\n*** Unexpected exception ***\n");
  53         show_frame (fp);
  54         printf("\n*** Please Reset Board! ***\n");
  55         for(;;);
  56 }
  57
  58 void trap_init(ulong value) {
  59         unsigned long *vec = (ulong *)value;
  60         int i;
  61
  62         for(i = 2; i < 25; i++) {
  63                 vec[i] = (unsigned long)_exc_handler;
  64         }
  65         for(i = 25; i < 32; i++) {
  66                 vec[i] = (unsigned long)_int_handler;
  67         }
  68         for(i = 32; i < 64; i++) {
  69                 vec[i] = (unsigned long)_exc_handler;
  70         }
  71         for(i = 64; i < 256; i++) {
  72                 vec[i] = (unsigned long)_int_handler;
  73         }
  74
  75         setvbr(value);          /* set vector base register to new table */
  76 }