cpu/mpc5xx/traps.c

   1 /*
   2  * linux/arch/ppc/kernel/traps.c
   3  *
   4  * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
   5  *
   6  * Modified by Cort Dougan (cort@cs.nmt.edu)
   7  * and Paul Mackerras (paulus@cs.anu.edu.au)
   8  *
   9  * (C) Copyright 2000
  10  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  11  *
  12  * See file CREDITS for list of people who contributed to this
  13  * project.
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License as
  17  * published by the Free Software Foundation; either version 2 of
  18  * the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  * MA 02111-1307 USA
  29  */
  30
  31 /*
  32  * This file handles the architecture-dependent parts of hardware exceptions
  33  */
  34
  35 #include <common.h>
  36 #include <command.h>
  37 #include <asm/processor.h>
  38
  39 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
  40 int (*debugger_exception_handler)(struct pt_regs *) = 0;
  41 #endif
  42
  43 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
  44 extern void do_bedbug_breakpoint(struct pt_regs *);
  45 #endif
  46
  47 /* Returns 0 if exception not found and fixup otherwise.  */
  48 extern unsigned long search_exception_table(unsigned long);
  49
  50 /* THIS NEEDS CHANGING to use the board info structure.
  51 */
  52 #define END_OF_MEM      0x0001000
  53
  54
  55 /*
  56  * Print stack backtrace
  57  */
  58 void print_backtrace(unsigned long *sp)
  59 {
  60         int cnt = 0;
  61         unsigned long i;
  62
  63         printf("Call backtrace: ");
  64         while (sp) {
  65                 if ((uint)sp > END_OF_MEM)
  66                         break;
  67
  68                 i = sp[1];
  69                 if (cnt++ % 7 == 0)
  70                         printf("\n");
  71                 printf("%08lX ", i);
  72                 if (cnt > 32) break;
  73                 sp = (unsigned long *)*sp;
  74         }
  75         printf("\n");
  76 }
  77
  78 /*
  79  * Print current registers
  80  */
  81 void show_regs(struct pt_regs * regs)
  82 {
  83         int i;
  84         printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
  85                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  86         printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
  87                regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
  88                regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
  89                regs->msr&MSR_IR ? 1 : 0,
  90                regs->msr&MSR_DR ? 1 : 0);
  91
  92         printf("\n");
  93         for (i = 0;  i < 32;  i++) {
  94                 if ((i % 8) == 0)
  95                 {
  96                         printf("GPR%02d: ", i);
  97                 }
  98
  99                 printf("%08lX ", regs->gpr[i]);
 100                 if ((i % 8) == 7)
 101                 {
 102                         printf("\n");
 103                 }
 104         }
 105 }
 106
 107
 108 /*
 109  * General exception handler routine
 110  */
 111 void _exception(int signr, struct pt_regs *regs)
 112 {
 113         show_regs(regs);
 114         print_backtrace((unsigned long *)regs->gpr[1]);
 115         panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
 116 }
 117
 118 /*
 119  * Machine check exception handler routine
 120  */
 121 void MachineCheckException(struct pt_regs *regs)
 122 {
 123         unsigned long fixup;
 124
 125         /* Probing PCI using config cycles cause this exception
 126          * when a device is not present.  Catch it and return to
 127          * the PCI exception handler.
 128          */
 129         if ((fixup = search_exception_table(regs->nip)) != 0) {
 130                 regs->nip = fixup;
 131                 return;
 132         }
 133
 134 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 135         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 136                 return;
 137 #endif
 138
 139         printf("Machine check in kernel mode.\n");
 140         printf("Caused by (from msr): ");
 141         printf("regs %p ",regs);
 142         switch( regs->msr & 0x000F0000) {
 143         case (0x80000000>>12):
 144                 printf("Machine check signal\n");
 145                 break;
 146         case (0x80000000>>13):
 147                 printf("Transfer error ack signal\n");
 148                 break;
 149         case (0x80000000>>14):
 150                 printf("Data parity signal\n");
 151                 break;
 152         case (0x80000000>>15):
 153                 printf("Address parity signal\n");
 154                 break;
 155         default:
 156                 printf("Unknown values in msr\n");
 157         }
 158         show_regs(regs);
 159         print_backtrace((unsigned long *)regs->gpr[1]);
 160         panic("machine check");
 161 }
 162
 163 /*
 164  * Alignment exception handler routine
 165  */
 166 void AlignmentException(struct pt_regs *regs)
 167 {
 168 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 169         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 170                 return;
 171 #endif
 172         show_regs(regs);
 173         print_backtrace((unsigned long *)regs->gpr[1]);
 174         panic("Alignment Exception");
 175 }
 176
 177 /*
 178  * Program check exception handler routine
 179  */
 180 void ProgramCheckException(struct pt_regs *regs)
 181 {
 182 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 183         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 184                 return;
 185 #endif
 186         show_regs(regs);
 187         print_backtrace((unsigned long *)regs->gpr[1]);
 188         panic("Program Check Exception");
 189 }
 190
 191 /*
 192  * Software emulation exception handler routine
 193  */
 194 void SoftEmuException(struct pt_regs *regs)
 195 {
 196 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 197         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 198                 return;
 199 #endif
 200         show_regs(regs);
 201         print_backtrace((unsigned long *)regs->gpr[1]);
 202         panic("Software Emulation Exception");
 203 }
 204
 205
 206 /*
 207  * Unknown exception handler routine
 208  */
 209 void UnknownException(struct pt_regs *regs)
 210 {
 211 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 212         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 213                 return;
 214 #endif
 215         printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 216                regs->nip, regs->msr, regs->trap);
 217         _exception(0, regs);
 218 }
 219
 220 /*
 221  * Debug exception handler routine
 222  */
 223 void DebugException(struct pt_regs *regs)
 224 {
 225         printf("Debugger trap at @ %lx\n", regs->nip );
 226         show_regs(regs);
 227 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
 228         do_bedbug_breakpoint( regs );
 229 #endif
 230 }