cpu/mpc83xx/traps.c

   1 /*
   2  * linux/arch/ppc/kernel/traps.c
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  17  * MA 02111-1307 USA
  18  *
  19  * Change log:
  20  *
  21  * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
  22  *
  23  * Modified by Cort Dougan (cort@cs.nmt.edu)
  24  * and Paul Mackerras (paulus@cs.anu.edu.au)
  25  *
  26  * (C) Copyright 2000
  27  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  28  *
  29  * 20050101: Eran Liberty (liberty@freescale.com)
  30  *           Initial file creating (porting from 85XX & 8260)
  31  */
  32
  33 /*
  34  * This file handles the architecture-dependent parts of hardware
  35  * exceptions
  36  */
  37
  38 #include <common.h>
  39 #include <command.h>
  40 #include <asm/processor.h>
  41 #include <asm/mpc8349_pci.h>
  42
  43 /* Returns 0 if exception not found and fixup otherwise.  */
  44 extern unsigned long search_exception_table(unsigned long);
  45
  46 #define END_OF_MEM      (gd->bd->bi_memstart + gd->bd->bi_memsize)
  47
  48 /*
  49  * Trap & Exception support
  50  */
  51
  52 void
  53 print_backtrace(unsigned long *sp)
  54 {
  55         DECLARE_GLOBAL_DATA_PTR;
  56         int cnt = 0;
  57         unsigned long i;
  58
  59         puts ("Call backtrace: ");
  60         while (sp) {
  61                 if ((uint)sp > END_OF_MEM)
  62                         break;
  63
  64                 i = sp[1];
  65                 if (cnt++ % 7 == 0)
  66                         putc ('\n');
  67                 printf("%08lX ", i);
  68                 if (cnt > 32) break;
  69                 sp = (unsigned long *)*sp;
  70         }
  71         putc ('\n');
  72 }
  73
  74 void show_regs(struct pt_regs * regs)
  75 {
  76         int i;
  77
  78         printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
  79                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  80         printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
  81                regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
  82                regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
  83                regs->msr&MSR_IR ? 1 : 0,
  84                regs->msr&MSR_DR ? 1 : 0);
  85
  86         putc ('\n');
  87         for (i = 0;  i < 32;  i++) {
  88                 if ((i % 8) == 0) {
  89                         printf("GPR%02d: ", i);
  90                 }
  91
  92                 printf("%08lX ", regs->gpr[i]);
  93                 if ((i % 8) == 7) {
  94                         putc ('\n');
  95                 }
  96         }
  97 }
  98
  99
 100 void
 101 _exception(int signr, struct pt_regs *regs)
 102 {
 103         show_regs(regs);
 104         print_backtrace((unsigned long *)regs->gpr[1]);
 105         panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
 106 }
 107
 108 #ifdef CONFIG_PCI
 109 void dump_pci (void)
 110 {
 111 /*
 112         volatile immap_t *immap = (immap_t *) CFG_IMMR;
 113         printf ("PCI: err status %x err mask %x err ctrl %x\n",
 114                 le32_to_cpu (immap->im_pci.pci_esr),
 115                 le32_to_cpu (immap->im_pci.pci_emr),
 116                 le32_to_cpu (immap->im_pci.pci_ecr));
 117         printf ("     error address %x error data %x ctrl %x\n",
 118                 le32_to_cpu (immap->im_pci.pci_eacr),
 119                 le32_to_cpu (immap->im_pci.pci_edcr),
 120                 le32_to_cpu (immap->im_pci.pci_eccr));
 121 */
 122 }
 123 #endif
 124
 125 void
 126 MachineCheckException(struct pt_regs *regs)
 127 {
 128         unsigned long fixup;
 129
 130         /* Probing PCI using config cycles cause this exception
 131          * when a device is not present.  Catch it and return to
 132          * the PCI exception handler.
 133          */
 134 #ifdef CONFIG_PCI
 135 #if 0
 136         volatile immap_t *immap  = (immap_t *)CFG_IMMR;
 137 #ifdef DEBUG
 138         dump_pci();
 139 #endif
 140         /* clear the error in the error status register */
 141         if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
 142                 immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
 143                 return;
 144         }
 145 #endif
 146 #endif /* CONFIG_PCI */
 147         if ((fixup = search_exception_table(regs->nip)) != 0) {
 148                 regs->nip = fixup;
 149                 return;
 150         }
 151
 152 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 153         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 154                 return;
 155 #endif
 156
 157         puts ("Machine check in kernel mode.\n"
 158                 "Caused by (from msr): ");
 159         printf("regs %p ",regs);
 160         switch( regs->msr & 0x000F0000) {
 161         case (0x80000000>>12):
 162                 puts ("Machine check signal - probably due to mm fault\n"
 163                         "with mmu off\n");
 164                 break;
 165         case (0x80000000>>13):
 166                 puts ("Transfer error ack signal\n");
 167                 break;
 168         case (0x80000000>>14):
 169                 puts ("Data parity signal\n");
 170                 break;
 171         case (0x80000000>>15):
 172                 puts ("Address parity signal\n");
 173                 break;
 174         default:
 175                 puts ("Unknown values in msr\n");
 176         }
 177         show_regs(regs);
 178         print_backtrace((unsigned long *)regs->gpr[1]);
 179 #ifdef CONFIG_PCI
 180         dump_pci();
 181 #endif
 182         panic("machine check");
 183 }
 184
 185 void
 186 AlignmentException(struct pt_regs *regs)
 187 {
 188 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 189         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 190                 return;
 191 #endif
 192         show_regs(regs);
 193         print_backtrace((unsigned long *)regs->gpr[1]);
 194         panic("Alignment Exception");
 195 }
 196
 197 void
 198 ProgramCheckException(struct pt_regs *regs)
 199 {
 200 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 201         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 202                 return;
 203 #endif
 204         show_regs(regs);
 205         print_backtrace((unsigned long *)regs->gpr[1]);
 206         panic("Program Check Exception");
 207 }
 208
 209 void
 210 SoftEmuException(struct pt_regs *regs)
 211 {
 212 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 213         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 214                 return;
 215 #endif
 216         show_regs(regs);
 217         print_backtrace((unsigned long *)regs->gpr[1]);
 218         panic("Software Emulation Exception");
 219 }
 220
 221
 222 void
 223 UnknownException(struct pt_regs *regs)
 224 {
 225 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 226         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 227                 return;
 228 #endif
 229         printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 230                regs->nip, regs->msr, regs->trap);
 231         _exception(0, regs);
 232 }
 233
 234 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
 235 extern void do_bedbug_breakpoint(struct pt_regs *);
 236 #endif
 237
 238 void
 239 DebugException(struct pt_regs *regs)
 240 {
 241         printf("Debugger trap at @ %lx\n", regs->nip );
 242         show_regs(regs);
 243 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
 244         do_bedbug_breakpoint( regs );
 245 #endif
 246 }
 247
 248 /* Probe an address by reading.  If not present, return -1, otherwise
 249  * return 0.
 250  */
 251 int
 252 addr_probe(uint *addr)
 253 {
 254 #if 0
 255         int     retval;
 256
 257         __asm__ __volatile__(                   \
 258                 "1:     lwz %0,0(%1)\n"         \
 259                 "       eieio\n"                \
 260                 "       li %0,0\n"              \
 261                 "2:\n"                          \
 262                 ".section .fixup,\"ax\"\n"      \
 263                 "3:     li %0,-1\n"             \
 264                 "       b 2b\n"                 \
 265                 ".section __ex_table,\"a\"\n"   \
 266                 "       .align 2\n"             \
 267                 "       .long 1b,3b\n"          \
 268                 ".text"                         \
 269                 : "=r" (retval) : "r"(addr));
 270
 271         return (retval);
 272 #endif
 273         return 0;
 274 }