cpu/mpc512x/traps.c

   1 /*
   2  * (C) Copyright 2000 - 2007
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  *
  22  * Derived from the MPC83xx code.
  23  */
  24
  25 /*
  26  * This file handles the architecture-dependent parts of hardware
  27  * exceptions
  28  */
  29
  30 #include <common.h>
  31 #include <asm/processor.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 extern unsigned long search_exception_table(unsigned long);
  36
  37 #define END_OF_MEM      (gd->bd->bi_memstart + gd->bd->bi_memsize)
  38
  39 /*
  40  * Trap & Exception support
  41  */
  42
  43 void
  44 print_backtrace (unsigned long *sp)
  45 {
  46         int cnt = 0;
  47         unsigned long i;
  48
  49         puts ("Call backtrace: ");
  50         while (sp) {
  51                 if ((uint)sp > END_OF_MEM)
  52                         break;
  53
  54                 i = sp[1];
  55                 if (cnt++ % 7 == 0)
  56                         putc ('\n');
  57                 printf ("%08lX ", i);
  58                 if (cnt > 32) break;
  59                 sp = (unsigned long *) *sp;
  60         }
  61         putc ('\n');
  62 }
  63
  64 void show_regs (struct pt_regs * regs)
  65 {
  66         int i;
  67
  68         printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
  69                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  70         printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
  71                regs->msr, regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
  72                regs->msr & MSR_FP ? 1 : 0,regs->msr & MSR_ME ? 1 : 0,
  73                regs->msr & MSR_IR ? 1 : 0,
  74                regs->msr & MSR_DR ? 1 : 0);
  75
  76         putc ('\n');
  77         for (i = 0;  i < 32;  i++) {
  78                 if ((i % 8) == 0) {
  79                         printf ("GPR%02d: ", i);
  80                 }
  81
  82                 printf ("%08lX ", regs->gpr[i]);
  83                 if ((i % 8) == 7) {
  84                         putc ('\n');
  85                 }
  86         }
  87 }
  88
  89
  90 void
  91 _exception (int signr, struct pt_regs *regs)
  92 {
  93         show_regs (regs);
  94         print_backtrace ((unsigned long *)regs->gpr[1]);
  95         panic ("Exception at pc %lx signal %d", regs->nip,signr);
  96 }
  97
  98
  99 void
 100 MachineCheckException (struct pt_regs *regs)
 101 {
 102         unsigned long fixup;
 103
 104         if ((fixup = search_exception_table (regs->nip)) != 0) {
 105                 regs->nip = fixup;
 106                 return;
 107         }
 108
 109 #ifdef CONFIG_CMD_KGDB
 110         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 111                 return;
 112 #endif
 113
 114         puts ("Machine check.\nCaused by (from msr): ");
 115         printf ("regs %p ",regs);
 116         switch (regs->msr & 0x00FF0000) {
 117         case (0x80000000 >> 10):
 118                 puts ("Instruction cache parity signal\n");
 119                 break;
 120         case (0x80000000 >> 11):
 121                 puts ("Data cache parity signal\n");
 122                 break;
 123         case (0x80000000 >> 12):
 124                 puts ("Machine check signal\n");
 125                 break;
 126         case (0x80000000 >> 13):
 127                 puts ("Transfer error ack signal\n");
 128                 break;
 129         case (0x80000000 >> 14):
 130                 puts ("Data parity signal\n");
 131                 break;
 132         case (0x80000000 >> 15):
 133                 puts ("Address parity signal\n");
 134                 break;
 135         default:
 136                 puts ("Unknown values in msr\n");
 137         }
 138         show_regs (regs);
 139         print_backtrace ((unsigned long *)regs->gpr[1]);
 140
 141         panic ("machine check");
 142 }
 143
 144 void
 145 AlignmentException (struct pt_regs *regs)
 146 {
 147 #ifdef CONFIG_CMD_KGDB
 148         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 149                 return;
 150 #endif
 151         show_regs (regs);
 152         print_backtrace ((unsigned long *)regs->gpr[1]);
 153         panic ("Alignment Exception");
 154 }
 155
 156 void
 157 ProgramCheckException (struct pt_regs *regs)
 158 {
 159 #ifdef CONFIG_CMD_KGDB
 160         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 161                 return;
 162 #endif
 163         show_regs (regs);
 164         print_backtrace ((unsigned long *)regs->gpr[1]);
 165         panic ("Program Check Exception");
 166 }
 167
 168 void
 169 SoftEmuException (struct pt_regs *regs)
 170 {
 171 #ifdef CONFIG_CMD_KGDB
 172         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 173                 return;
 174 #endif
 175         show_regs (regs);
 176         print_backtrace ((unsigned long *)regs->gpr[1]);
 177         panic ("Software Emulation Exception");
 178 }
 179
 180
 181 void
 182 UnknownException (struct pt_regs *regs)
 183 {
 184 #ifdef CONFIG_CMD_KGDB
 185         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 186                 return;
 187 #endif
 188         printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 189                regs->nip, regs->msr, regs->trap);
 190         _exception (0, regs);
 191 }
 192
 193 #ifdef CONFIG_CMD_BEDBUG
 194 extern void do_bedbug_breakpoint (struct pt_regs *);
 195 #endif
 196
 197 void
 198 DebugException (struct pt_regs *regs)
 199 {
 200         printf ("Debugger trap at @ %lx\n", regs->nip );
 201         show_regs (regs);
 202 #ifdef CONFIG_CMD_BEDBUG
 203         do_bedbug_breakpoint (regs);
 204 #endif
 205 }