arch/powerpc/cpu/mpc86xx/traps.c

   1 /*
   2  * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
   3  *
   4  * Modified by Cort Dougan (cort@cs.nmt.edu)
   5  * and Paul Mackerras (paulus@cs.anu.edu.au)
   6  *
   7  * (C) Copyright 2000
   8  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   9  *
  10  * See file CREDITS for list of people who contributed to this
  11  * project.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation; either version 2 of
  16  * the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  26  * MA 02111-1307 USA
  27  */
  28
  29 /*
  30  * This file handles the architecture-dependent parts of hardware exceptions
  31  */
  32
  33 #include <common.h>
  34 #include <command.h>
  35 #include <kgdb.h>
  36 #include <asm/processor.h>
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 /* Returns 0 if exception not found and fixup otherwise.  */
  41 extern unsigned long search_exception_table(unsigned long);
  42
  43 /*
  44  * End of addressable memory.  This may be less than the actual
  45  * amount of memory on the system if we're unable to keep all
  46  * the memory mapped in.
  47  */
  48 extern ulong get_effective_memsize(void);
  49 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
  50
  51 /*
  52  * Trap & Exception support
  53  */
  54
  55 void
  56 print_backtrace(unsigned long *sp)
  57 {
  58         int cnt = 0;
  59         unsigned long i;
  60
  61         printf("Call backtrace: ");
  62         while (sp) {
  63                 if ((uint) sp > END_OF_MEM)
  64                         break;
  65
  66                 i = sp[1];
  67                 if (cnt++ % 7 == 0)
  68                         printf("\n");
  69                 printf("%08lX ", i);
  70                 if (cnt > 32)
  71                         break;
  72                 sp = (unsigned long *)*sp;
  73         }
  74         printf("\n");
  75 }
  76
  77 void
  78 show_regs(struct pt_regs *regs)
  79 {
  80         int i;
  81
  82         printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
  83                " %p TRAP: %04lx DAR: %08lX\n",
  84                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  85         printf("MSR: %08lx EE: %01x PR: %01x FP:"
  86                " %01x ME: %01x IR/DR: %01x%01x\n",
  87                regs->msr, regs->msr & MSR_EE ? 1 : 0,
  88                regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0,
  89                regs->msr & MSR_ME ? 1 : 0, 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                         printf("GPR%02d: ", i);
  96                 }
  97
  98                 printf("%08lX ", regs->gpr[i]);
  99                 if ((i % 8) == 7) {
 100                         printf("\n");
 101                 }
 102         }
 103 }
 104
 105
 106 void
 107 _exception(int signr, struct pt_regs *regs)
 108 {
 109         show_regs(regs);
 110         print_backtrace((unsigned long *)regs->gpr[1]);
 111         panic("Exception in kernel pc %lx signal %d", regs->nip, signr);
 112 }
 113
 114 void
 115 MachineCheckException(struct pt_regs *regs)
 116 {
 117         unsigned long fixup;
 118
 119         /* Probing PCI using config cycles cause this exception
 120          * when a device is not present.  Catch it and return to
 121          * the PCI exception handler.
 122          */
 123         if ((fixup = search_exception_table(regs->nip)) != 0) {
 124                 regs->nip = fixup;
 125                 return;
 126         }
 127
 128 #if defined(CONFIG_CMD_KGDB)
 129         if (debugger_exception_handler && (*debugger_exception_handler) (regs))
 130                 return;
 131 #endif
 132
 133         printf("Machine check in kernel mode.\n");
 134         printf("Caused by (from msr): ");
 135         printf("regs %p ", regs);
 136         switch ( regs->msr & 0x001F0000) {
 137         case (0x80000000>>11):
 138                 printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0));
 139                 break;
 140         case (0x80000000>>12):
 141                 printf("Machine check signal - probably due to mm fault\n"
 142                        "with mmu off\n");
 143                 break;
 144         case (0x80000000 >> 13):
 145                 printf("Transfer error ack signal\n");
 146                 break;
 147         case (0x80000000 >> 14):
 148                 printf("Data parity signal\n");
 149                 break;
 150         case (0x80000000 >> 15):
 151                 printf("Address parity signal\n");
 152                 break;
 153         default:
 154                 printf("Unknown values in msr\n");
 155         }
 156         show_regs(regs);
 157         print_backtrace((unsigned long *)regs->gpr[1]);
 158         panic("machine check");
 159 }
 160
 161 void
 162 AlignmentException(struct pt_regs *regs)
 163 {
 164 #if defined(CONFIG_CMD_KGDB)
 165         if (debugger_exception_handler && (*debugger_exception_handler) (regs))
 166                 return;
 167 #endif
 168         show_regs(regs);
 169         print_backtrace((unsigned long *)regs->gpr[1]);
 170         panic("Alignment Exception");
 171 }
 172
 173 void
 174 ProgramCheckException(struct pt_regs *regs)
 175 {
 176         unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
 177         int i, j;
 178
 179 #if defined(CONFIG_CMD_KGDB)
 180         if (debugger_exception_handler && (*debugger_exception_handler) (regs))
 181                 return;
 182 #endif
 183         show_regs(regs);
 184
 185         p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0);
 186         p -= 32;
 187         for (i = 0; i < 256; i += 16) {
 188                 printf("%08x: ", (unsigned int)p + i);
 189                 for (j = 0; j < 16; j++) {
 190                         printf("%02x ", p[i + j]);
 191                 }
 192                 printf("\n");
 193         }
 194
 195         print_backtrace((unsigned long *)regs->gpr[1]);
 196         panic("Program Check Exception");
 197 }
 198
 199 void
 200 SoftEmuException(struct pt_regs *regs)
 201 {
 202 #if defined(CONFIG_CMD_KGDB)
 203         if (debugger_exception_handler && (*debugger_exception_handler) (regs))
 204                 return;
 205 #endif
 206         show_regs(regs);
 207         print_backtrace((unsigned long *)regs->gpr[1]);
 208         panic("Software Emulation Exception");
 209 }
 210
 211 void
 212 UnknownException(struct pt_regs *regs)
 213 {
 214 #if defined(CONFIG_CMD_KGDB)
 215         if (debugger_exception_handler && (*debugger_exception_handler) (regs))
 216                 return;
 217 #endif
 218         printf("UnknownException regs@%lx\n", (ulong)regs);
 219         printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 220                regs->nip, regs->msr, regs->trap);
 221         _exception(0, regs);
 222 }
 223
 224 /*
 225  * Probe an address by reading.
 226  * If not present, return -1,
 227  * otherwise return 0.
 228  */
 229 int
 230 addr_probe(uint *addr)
 231 {
 232         return 0;
 233 }