arch/ppc/cpu/mpc85xx/traps.c

   1 /*
   2  * linux/arch/ppc/kernel/traps.c
   3  *
   4  * Copyright 2007 Freescale Semiconductor.
   5  * Copyright (C) 2003 Motorola
   6  * Modified by Xianghua Xiao(x.xiao@motorola.com)
   7  *
   8  * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
   9  *
  10  * Modified by Cort Dougan (cort@cs.nmt.edu)
  11  * and Paul Mackerras (paulus@cs.anu.edu.au)
  12  *
  13  * (C) Copyright 2000
  14  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  15  *
  16  * See file CREDITS for list of people who contributed to this
  17  * project.
  18  *
  19  * This program is free software; you can redistribute it and/or
  20  * modify it under the terms of the GNU General Public License as
  21  * published by the Free Software Foundation; either version 2 of
  22  * the License, or (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, write to the Free Software
  31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  32  * MA 02111-1307 USA
  33  */
  34
  35 /*
  36  * This file handles the architecture-dependent parts of hardware exceptions
  37  */
  38
  39 #include <common.h>
  40 #include <command.h>
  41 #include <kgdb.h>
  42 #include <asm/processor.h>
  43
  44 DECLARE_GLOBAL_DATA_PTR;
  45
  46 /* Returns 0 if exception not found and fixup otherwise.  */
  47 extern unsigned long search_exception_table(unsigned long);
  48
  49 /*
  50  * End of addressable memory.  This may be less than the actual
  51  * amount of memory on the system if we're unable to keep all
  52  * the memory mapped in.
  53  */
  54 extern ulong get_effective_memsize(void);
  55 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
  56
  57 static __inline__ void set_tsr(unsigned long val)
  58 {
  59         asm volatile("mtspr 0x150, %0" : : "r" (val));
  60 }
  61
  62 static __inline__ unsigned long get_esr(void)
  63 {
  64         unsigned long val;
  65         asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
  66         return val;
  67 }
  68
  69 #define ESR_MCI 0x80000000
  70 #define ESR_PIL 0x08000000
  71 #define ESR_PPR 0x04000000
  72 #define ESR_PTR 0x02000000
  73 #define ESR_DST 0x00800000
  74 #define ESR_DIZ 0x00400000
  75 #define ESR_U0F 0x00008000
  76
  77 #if defined(CONFIG_CMD_BEDBUG)
  78 extern void do_bedbug_breakpoint(struct pt_regs *);
  79 #endif
  80
  81 /*
  82  * Trap & Exception support
  83  */
  84
  85 void
  86 print_backtrace(unsigned long *sp)
  87 {
  88         int cnt = 0;
  89         unsigned long i;
  90
  91         printf("Call backtrace: ");
  92         while (sp) {
  93                 if ((uint)sp > END_OF_MEM)
  94                         break;
  95
  96                 i = sp[1];
  97                 if (cnt++ % 7 == 0)
  98                         printf("\n");
  99                 printf("%08lX ", i);
 100                 if (cnt > 32) break;
 101                 sp = (unsigned long *)*sp;
 102         }
 103         printf("\n");
 104 }
 105
 106 void show_regs(struct pt_regs * regs)
 107 {
 108         int i;
 109
 110         printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
 111                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
 112         printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
 113                regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
 114                regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
 115                regs->msr&MSR_IR ? 1 : 0,
 116                regs->msr&MSR_DR ? 1 : 0);
 117
 118         printf("\n");
 119         for (i = 0;  i < 32;  i++) {
 120                 if ((i % 8) == 0)
 121                 {
 122                         printf("GPR%02d: ", i);
 123                 }
 124
 125                 printf("%08lX ", regs->gpr[i]);
 126                 if ((i % 8) == 7)
 127                 {
 128                         printf("\n");
 129                 }
 130         }
 131 }
 132
 133
 134 void
 135 _exception(int signr, struct pt_regs *regs)
 136 {
 137         show_regs(regs);
 138         print_backtrace((unsigned long *)regs->gpr[1]);
 139         panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
 140 }
 141
 142 void
 143 CritcalInputException(struct pt_regs *regs)
 144 {
 145         panic("Critical Input Exception");
 146 }
 147
 148 int machinecheck_count = 0;
 149 int machinecheck_error = 0;
 150 void
 151 MachineCheckException(struct pt_regs *regs)
 152 {
 153         unsigned long fixup;
 154         unsigned int mcsr, mcsrr0, mcsrr1, mcar;
 155
 156         /* Probing PCI using config cycles cause this exception
 157          * when a device is not present.  Catch it and return to
 158          * the PCI exception handler.
 159          */
 160         if ((fixup = search_exception_table(regs->nip)) != 0) {
 161                 regs->nip = fixup;
 162                 return;
 163         }
 164
 165         mcsrr0 = mfspr(SPRN_MCSRR0);
 166         mcsrr1 = mfspr(SPRN_MCSRR1);
 167         mcsr = mfspr(SPRN_MCSR);
 168         mcar = mfspr(SPRN_MCAR);
 169
 170         machinecheck_count++;
 171         machinecheck_error=1;
 172
 173 #if defined(CONFIG_CMD_KGDB)
 174         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 175                 return;
 176 #endif
 177
 178         printf("Machine check in kernel mode.\n");
 179         printf("Caused by (from mcsr): ");
 180         printf("mcsr = 0x%08x\n", mcsr);
 181         if (mcsr & 0x80000000)
 182                 printf("Machine check input pin\n");
 183         if (mcsr & 0x40000000)
 184                 printf("Instruction cache parity error\n");
 185         if (mcsr & 0x20000000)
 186                 printf("Data cache push parity error\n");
 187         if (mcsr & 0x10000000)
 188                 printf("Data cache parity error\n");
 189         if (mcsr & 0x00000080)
 190                 printf("Bus instruction address error\n");
 191         if (mcsr & 0x00000040)
 192                 printf("Bus Read address error\n");
 193         if (mcsr & 0x00000020)
 194                 printf("Bus Write address error\n");
 195         if (mcsr & 0x00000010)
 196                 printf("Bus Instruction data bus error\n");
 197         if (mcsr & 0x00000008)
 198                 printf("Bus Read data bus error\n");
 199         if (mcsr & 0x00000004)
 200                 printf("Bus Write bus error\n");
 201         if (mcsr & 0x00000002)
 202                 printf("Bus Instruction parity error\n");
 203         if (mcsr & 0x00000001)
 204                 printf("Bus Read parity error\n");
 205
 206         show_regs(regs);
 207         printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
 208                mcsr, mcsrr0, mcsrr1, mcar);
 209         print_backtrace((unsigned long *)regs->gpr[1]);
 210         if (machinecheck_count > 10) {
 211                 panic("machine check count too high\n");
 212         }
 213
 214         if (machinecheck_count > 1) {
 215                 regs->nip += 4; /* skip offending instruction */
 216                 printf("Skipping current instr, Returning to 0x%08lx\n",
 217                        regs->nip);
 218         } else {
 219                 printf("Returning back to 0x%08lx\n",regs->nip);
 220         }
 221 }
 222
 223 void
 224 AlignmentException(struct pt_regs *regs)
 225 {
 226 #if defined(CONFIG_CMD_KGDB)
 227         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 228                 return;
 229 #endif
 230
 231         show_regs(regs);
 232         print_backtrace((unsigned long *)regs->gpr[1]);
 233         panic("Alignment Exception");
 234 }
 235
 236 void
 237 ProgramCheckException(struct pt_regs *regs)
 238 {
 239         long esr_val;
 240
 241 #if defined(CONFIG_CMD_KGDB)
 242         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 243                 return;
 244 #endif
 245
 246         show_regs(regs);
 247
 248         esr_val = get_esr();
 249         if( esr_val & ESR_PIL )
 250                 printf( "** Illegal Instruction **\n" );
 251         else if( esr_val & ESR_PPR )
 252                 printf( "** Privileged Instruction **\n" );
 253         else if( esr_val & ESR_PTR )
 254                 printf( "** Trap Instruction **\n" );
 255
 256         print_backtrace((unsigned long *)regs->gpr[1]);
 257         panic("Program Check Exception");
 258 }
 259
 260 void
 261 PITException(struct pt_regs *regs)
 262 {
 263         /*
 264          * Reset PIT interrupt
 265          */
 266         set_tsr(0x0c000000);
 267
 268         /*
 269          * Call timer_interrupt routine in interrupts.c
 270          */
 271         timer_interrupt(NULL);
 272 }
 273
 274
 275 void
 276 UnknownException(struct pt_regs *regs)
 277 {
 278 #if defined(CONFIG_CMD_KGDB)
 279         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 280                 return;
 281 #endif
 282
 283         printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 284                regs->nip, regs->msr, regs->trap);
 285         _exception(0, regs);
 286 }
 287
 288 void
 289 ExtIntException(struct pt_regs *regs)
 290 {
 291         volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC85xx_PIC_ADDR);
 292
 293         uint vect;
 294
 295 #if defined(CONFIG_CMD_KGDB)
 296         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 297                 return;
 298 #endif
 299
 300         printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
 301                regs->nip, regs->msr, regs->trap);
 302         vect = pic->iack0;
 303         printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
 304         show_regs(regs);
 305         print_backtrace((unsigned long *)regs->gpr[1]);
 306 }
 307
 308 void
 309 DebugException(struct pt_regs *regs)
 310 {
 311         printf("Debugger trap at @ %lx\n", regs->nip );
 312         show_regs(regs);
 313 #if defined(CONFIG_CMD_BEDBUG)
 314         do_bedbug_breakpoint( regs );
 315 #endif
 316 }
 317
 318 /* Probe an address by reading.  If not present, return -1, otherwise
 319  * return 0.
 320  */
 321 int
 322 addr_probe(uint *addr)
 323 {
 324         return 0;
 325 }