cpu/mpc83xx/traps.c

   1 /*
   2  * (C) Copyright 2000
   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
  23 /*
  24  * This file handles the architecture-dependent parts of hardware
  25  * exceptions
  26  */
  27
  28 #include <common.h>
  29 #include <command.h>
  30 #include <asm/processor.h>
  31 #include <asm/mpc8349_pci.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 /* Returns 0 if exception not found and fixup otherwise.  */
  36 extern unsigned long search_exception_table(unsigned long);
  37
  38 #define END_OF_MEM      (gd->bd->bi_memstart + gd->bd->bi_memsize)
  39
  40 /*
  41  * Trap & Exception support
  42  */
  43
  44 void
  45 print_backtrace(unsigned long *sp)
  46 {
  47         int cnt = 0;
  48         unsigned long i;
  49
  50         puts ("Call backtrace: ");
  51         while (sp) {
  52                 if ((uint)sp > END_OF_MEM)
  53                         break;
  54
  55                 i = sp[1];
  56                 if (cnt++ % 7 == 0)
  57                         putc ('\n');
  58                 printf("%08lX ", i);
  59                 if (cnt > 32) break;
  60                 sp = (unsigned long *)*sp;
  61         }
  62         putc ('\n');
  63 }
  64
  65 void show_regs(struct pt_regs * regs)
  66 {
  67         int i;
  68
  69         printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
  70                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  71         printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
  72                regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
  73                regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
  74                regs->msr&MSR_IR ? 1 : 0,
  75                regs->msr&MSR_DR ? 1 : 0);
  76
  77         putc ('\n');
  78         for (i = 0;  i < 32;  i++) {
  79                 if ((i % 8) == 0) {
  80                         printf("GPR%02d: ", i);
  81                 }
  82
  83                 printf("%08lX ", regs->gpr[i]);
  84                 if ((i % 8) == 7) {
  85                         putc ('\n');
  86                 }
  87         }
  88 }
  89
  90
  91 void
  92 _exception(int signr, struct pt_regs *regs)
  93 {
  94         show_regs(regs);
  95         print_backtrace((unsigned long *)regs->gpr[1]);
  96         panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
  97 }
  98
  99 #ifdef CONFIG_PCI
 100 void dump_pci (void)
 101 {
 102 /*
 103         volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 104         printf ("PCI: err status %x err mask %x err ctrl %x\n",
 105                 le32_to_cpu (immap->im_pci.pci_esr),
 106                 le32_to_cpu (immap->im_pci.pci_emr),
 107                 le32_to_cpu (immap->im_pci.pci_ecr));
 108         printf ("     error address %x error data %x ctrl %x\n",
 109                 le32_to_cpu (immap->im_pci.pci_eacr),
 110                 le32_to_cpu (immap->im_pci.pci_edcr),
 111                 le32_to_cpu (immap->im_pci.pci_eccr));
 112 */
 113 }
 114 #endif
 115
 116 void
 117 MachineCheckException(struct pt_regs *regs)
 118 {
 119         unsigned long fixup;
 120
 121         /* Probing PCI using config cycles cause this exception
 122          * when a device is not present.  Catch it and return to
 123          * the PCI exception handler.
 124          */
 125 #ifdef CONFIG_PCI
 126 #if 0
 127         volatile immap_t *immap  = (immap_t *)CONFIG_SYS_IMMR;
 128 #ifdef DEBUG
 129         dump_pci();
 130 #endif
 131         /* clear the error in the error status register */
 132         if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
 133                 immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
 134                 return;
 135         }
 136 #endif
 137 #endif /* CONFIG_PCI */
 138         if ((fixup = search_exception_table(regs->nip)) != 0) {
 139                 regs->nip = fixup;
 140                 return;
 141         }
 142
 143 #if defined(CONFIG_CMD_KGDB)
 144         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 145                 return;
 146 #endif
 147
 148         puts ("Machine check in kernel mode.\n"
 149                 "Caused by (from msr): ");
 150         printf("regs %p ",regs);
 151         switch( regs->msr & 0x000F0000) {
 152         case (0x80000000>>12):
 153                 puts ("Machine check signal - probably due to mm fault\n"
 154                         "with mmu off\n");
 155                 break;
 156         case (0x80000000>>13):
 157                 puts ("Transfer error ack signal\n");
 158                 break;
 159         case (0x80000000>>14):
 160                 puts ("Data parity signal\n");
 161                 break;
 162         case (0x80000000>>15):
 163                 puts ("Address parity signal\n");
 164                 break;
 165         default:
 166                 puts ("Unknown values in msr\n");
 167         }
 168         show_regs(regs);
 169         print_backtrace((unsigned long *)regs->gpr[1]);
 170 #ifdef CONFIG_PCI
 171         dump_pci();
 172 #endif
 173         panic("machine check");
 174 }
 175
 176 void
 177 AlignmentException(struct pt_regs *regs)
 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         print_backtrace((unsigned long *)regs->gpr[1]);
 185         panic("Alignment Exception");
 186 }
 187
 188 void
 189 ProgramCheckException(struct pt_regs *regs)
 190 {
 191 #if defined(CONFIG_CMD_KGDB)
 192         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 193                 return;
 194 #endif
 195         show_regs(regs);
 196         print_backtrace((unsigned long *)regs->gpr[1]);
 197         panic("Program Check Exception");
 198 }
 199
 200 void
 201 SoftEmuException(struct pt_regs *regs)
 202 {
 203 #if defined(CONFIG_CMD_KGDB)
 204         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 205                 return;
 206 #endif
 207         show_regs(regs);
 208         print_backtrace((unsigned long *)regs->gpr[1]);
 209         panic("Software Emulation Exception");
 210 }
 211
 212
 213 void
 214 UnknownException(struct pt_regs *regs)
 215 {
 216 #if defined(CONFIG_CMD_KGDB)
 217         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 218                 return;
 219 #endif
 220         printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 221                regs->nip, regs->msr, regs->trap);
 222         _exception(0, regs);
 223 }
 224
 225 #if defined(CONFIG_CMD_BEDBUG)
 226 extern void do_bedbug_breakpoint(struct pt_regs *);
 227 #endif
 228
 229 void
 230 DebugException(struct pt_regs *regs)
 231 {
 232         printf("Debugger trap at @ %lx\n", regs->nip );
 233         show_regs(regs);
 234 #if defined(CONFIG_CMD_BEDBUG)
 235         do_bedbug_breakpoint( regs );
 236 #endif
 237 }
 238
 239 /* Probe an address by reading.  If not present, return -1, otherwise
 240  * return 0.
 241  */
 242 int
 243 addr_probe(uint *addr)
 244 {
 245 #if 0
 246         int     retval;
 247
 248         __asm__ __volatile__(                   \
 249                 "1:     lwz %0,0(%1)\n"         \
 250                 "       eieio\n"                \
 251                 "       li %0,0\n"              \
 252                 "2:\n"                          \
 253                 ".section .fixup,\"ax\"\n"      \
 254                 "3:     li %0,-1\n"             \
 255                 "       b 2b\n"                 \
 256                 ".section __ex_table,\"a\"\n"   \
 257                 "       .align 2\n"             \
 258                 "       .long 1b,3b\n"          \
 259                 ".text"                         \
 260                 : "=r" (retval) : "r"(addr));
 261
 262         return (retval);
 263 #endif
 264         return 0;
 265 }