arch/powerpc/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 <kgdb.h>
  32 #include <asm/processor.h>
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 extern unsigned long search_exception_table(unsigned long);
  37
  38 /*
  39  * End of addressable memory.  This may be less than the actual
  40  * amount of memory on the system if we're unable to keep all
  41  * the memory mapped in.
  42  */
  43 extern ulong get_effective_memsize(void);
  44 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
  45
  46 /*
  47  * Trap & Exception support
  48  */
  49
  50 void
  51 print_backtrace (unsigned long *sp)
  52 {
  53         int cnt = 0;
  54         unsigned long i;
  55
  56         puts ("Call backtrace: ");
  57         while (sp) {
  58                 if ((uint)sp > END_OF_MEM)
  59                         break;
  60
  61                 i = sp[1];
  62                 if (cnt++ % 7 == 0)
  63                         putc ('\n');
  64                 printf ("%08lX ", i);
  65                 if (cnt > 32) break;
  66                 sp = (unsigned long *) *sp;
  67         }
  68         putc ('\n');
  69 }
  70
  71 void show_regs (struct pt_regs * regs)
  72 {
  73         int i;
  74
  75         printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
  76                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  77         printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
  78                regs->msr, regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
  79                regs->msr & MSR_FP ? 1 : 0,regs->msr & MSR_ME ? 1 : 0,
  80                regs->msr & MSR_IR ? 1 : 0,
  81                regs->msr & MSR_DR ? 1 : 0);
  82
  83         putc ('\n');
  84         for (i = 0;  i < 32;  i++) {
  85                 if ((i % 8) == 0) {
  86                         printf ("GPR%02d: ", i);
  87                 }
  88
  89                 printf ("%08lX ", regs->gpr[i]);
  90                 if ((i % 8) == 7) {
  91                         putc ('\n');
  92                 }
  93         }
  94 }
  95
  96
  97 void
  98 _exception (int signr, struct pt_regs *regs)
  99 {
 100         show_regs (regs);
 101         print_backtrace ((unsigned long *)regs->gpr[1]);
 102         panic ("Exception at pc %lx signal %d", regs->nip,signr);
 103 }
 104
 105
 106 void
 107 MachineCheckException (struct pt_regs *regs)
 108 {
 109         unsigned long fixup;
 110
 111         if ((fixup = search_exception_table (regs->nip)) != 0) {
 112                 regs->nip = fixup;
 113                 return;
 114         }
 115
 116 #ifdef CONFIG_CMD_KGDB
 117         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 118                 return;
 119 #endif
 120
 121         puts ("Machine check.\nCaused by (from msr): ");
 122         printf ("regs %p ",regs);
 123         switch (regs->msr & 0x00FF0000) {
 124         case (0x80000000 >> 10):
 125                 puts ("Instruction cache parity signal\n");
 126                 break;
 127         case (0x80000000 >> 11):
 128                 puts ("Data cache parity signal\n");
 129                 break;
 130         case (0x80000000 >> 12):
 131                 puts ("Machine check signal\n");
 132                 break;
 133         case (0x80000000 >> 13):
 134                 puts ("Transfer error ack signal\n");
 135                 break;
 136         case (0x80000000 >> 14):
 137                 puts ("Data parity signal\n");
 138                 break;
 139         case (0x80000000 >> 15):
 140                 puts ("Address parity signal\n");
 141                 break;
 142         default:
 143                 puts ("Unknown values in msr\n");
 144         }
 145         show_regs (regs);
 146         print_backtrace ((unsigned long *)regs->gpr[1]);
 147
 148         panic ("machine check");
 149 }
 150
 151 void
 152 AlignmentException (struct pt_regs *regs)
 153 {
 154 #ifdef CONFIG_CMD_KGDB
 155         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 156                 return;
 157 #endif
 158         show_regs (regs);
 159         print_backtrace ((unsigned long *)regs->gpr[1]);
 160         panic ("Alignment Exception");
 161 }
 162
 163 void
 164 ProgramCheckException (struct pt_regs *regs)
 165 {
 166 #ifdef CONFIG_CMD_KGDB
 167         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 168                 return;
 169 #endif
 170         show_regs (regs);
 171         print_backtrace ((unsigned long *)regs->gpr[1]);
 172         panic ("Program Check Exception");
 173 }
 174
 175 void
 176 SoftEmuException (struct pt_regs *regs)
 177 {
 178 #ifdef CONFIG_CMD_KGDB
 179         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 180                 return;
 181 #endif
 182         show_regs (regs);
 183         print_backtrace ((unsigned long *)regs->gpr[1]);
 184         panic ("Software Emulation Exception");
 185 }
 186
 187
 188 void
 189 UnknownException (struct pt_regs *regs)
 190 {
 191 #ifdef CONFIG_CMD_KGDB
 192         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 193                 return;
 194 #endif
 195         printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 196                regs->nip, regs->msr, regs->trap);
 197         _exception (0, regs);
 198 }
 199
 200 #ifdef CONFIG_CMD_BEDBUG
 201 extern void do_bedbug_breakpoint (struct pt_regs *);
 202 #endif
 203
 204 void
 205 DebugException (struct pt_regs *regs)
 206 {
 207         printf ("Debugger trap at @ %lx\n", regs->nip );
 208         show_regs (regs);
 209 #ifdef CONFIG_CMD_BEDBUG
 210         do_bedbug_breakpoint (regs);
 211 #endif
 212 }