cpu/microblaze/exception.c

   1 /*
   2  * (C) Copyright 2007 Michal Simek
   3  *
   4  * Michal  SIMEK <monstr@monstr.eu>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <asm/asm.h>
  27
  28 void _hw_exception_handler (void)
  29 {
  30         int address = 0;
  31         int state = 0;
  32         /* loading address of exception EAR */
  33         MFS (address, rear);
  34         /* loading excetpion state register ESR */
  35         MFS (state, resr);
  36         printf ("Hardware exception at 0x%x address\n", address);
  37         switch (state & 0x1f) { /* mask on exception cause */
  38         case 0x1:
  39                 puts ("Unaligned data access exception\n");
  40                 break;
  41         case 0x2:
  42                 puts ("Illegal op-code exception\n");
  43                 break;
  44         case 0x3:
  45                 puts ("Instruction bus error exception\n");
  46                 break;
  47         case 0x4:
  48                 puts ("Data bus error exception\n");
  49                 break;
  50         case 0x5:
  51                 puts ("Divide by zero exception\n");
  52                 break;
  53 #ifdef MICROBLAZE_V5
  54         case 0x1000:
  55                 puts ("Exception in delay slot\n");
  56                 break;
  57 #endif
  58         default:
  59                 puts ("Undefined cause\n");
  60                 break;
  61         }
  62         printf ("Unaligned %sword access\n", ((state & 0x800) ? "" : "half"));
  63         printf ("Unaligned %s access\n", ((state & 0x400) ? "store" : "load"));
  64         printf ("Register R%x\n", (state & 0x3E) >> 5);
  65         hang ();
  66 }
  67
  68 #ifdef CONFIG_SYS_USR_EXCEP
  69 void _exception_handler (void)
  70 {
  71         puts ("User vector_exception\n");
  72         hang ();
  73 }
  74 #endif