cpu/ppc4xx/traps.c

   1 /*
   2  * linux/arch/ppc/kernel/traps.c
   3  *
   4  * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
   5  *
   6  * Modified by Cort Dougan (cort@cs.nmt.edu)
   7  * and Paul Mackerras (paulus@cs.anu.edu.au)
   8  *
   9  * (C) Copyright 2000
  10  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  11  *
  12  * See file CREDITS for list of people who contributed to this
  13  * project.
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License as
  17  * published by the Free Software Foundation; either version 2 of
  18  * the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  * MA 02111-1307 USA
  29  */
  30
  31 /*
  32  * This file handles the architecture-dependent parts of hardware exceptions
  33  */
  34
  35 #include <common.h>
  36 #include <command.h>
  37 #include <asm/processor.h>
  38
  39 DECLARE_GLOBAL_DATA_PTR;
  40
  41 #if defined(CONFIG_CMD_KGDB)
  42 int (*debugger_exception_handler)(struct pt_regs *) = 0;
  43 #endif
  44
  45 /* Returns 0 if exception not found and fixup otherwise.  */
  46 extern unsigned long search_exception_table(unsigned long);
  47
  48 /* THIS NEEDS CHANGING to use the board info structure.
  49  */
  50 #define END_OF_MEM      (gd->bd->bi_memstart + gd->bd->bi_memsize)
  51
  52 static __inline__ void set_tsr(unsigned long val)
  53 {
  54 #if defined(CONFIG_440)
  55         asm volatile("mtspr 0x150, %0" : : "r" (val));
  56 #else
  57         asm volatile("mttsr %0" : : "r" (val));
  58 #endif
  59 }
  60
  61 static __inline__ unsigned long get_esr(void)
  62 {
  63         unsigned long val;
  64
  65 #if defined(CONFIG_440)
  66         asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
  67 #else
  68         asm volatile("mfesr %0" : "=r" (val) :);
  69 #endif
  70         return val;
  71 }
  72
  73 #define ESR_MCI 0x80000000
  74 #define ESR_PIL 0x08000000
  75 #define ESR_PPR 0x04000000
  76 #define ESR_PTR 0x02000000
  77 #define ESR_DST 0x00800000
  78 #define ESR_DIZ 0x00400000
  79 #define ESR_U0F 0x00008000
  80
  81 #if defined(CONFIG_CMD_BEDBUG)
  82 extern void do_bedbug_breakpoint(struct pt_regs *);
  83 #endif
  84
  85 /*
  86  * Trap & Exception support
  87  */
  88
  89 void
  90 print_backtrace(unsigned long *sp)
  91 {
  92         int cnt = 0;
  93         unsigned long i;
  94
  95         printf("Call backtrace: ");
  96         while (sp) {
  97                 if ((uint)sp > END_OF_MEM)
  98                         break;
  99
 100                 i = sp[1];
 101                 if (cnt++ % 7 == 0)
 102                         printf("\n");
 103                 printf("%08lX ", i);
 104                 if (cnt > 32) break;
 105                 sp = (unsigned long *)*sp;
 106         }
 107         printf("\n");
 108 }
 109
 110 void show_regs(struct pt_regs * regs)
 111 {
 112         int i;
 113
 114         printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DEAR: %08lX\n",
 115                regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
 116         printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
 117                regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
 118                regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
 119                regs->msr&MSR_IR ? 1 : 0,
 120                regs->msr&MSR_DR ? 1 : 0);
 121
 122         printf("\n");
 123         for (i = 0;  i < 32;  i++) {
 124                 if ((i % 8) == 0) {
 125                         printf("GPR%02d: ", i);
 126                 }
 127
 128                 printf("%08lX ", regs->gpr[i]);
 129                 if ((i % 8) == 7) {
 130                         printf("\n");
 131                 }
 132         }
 133 }
 134
 135
 136 void
 137 _exception(int signr, struct pt_regs *regs)
 138 {
 139         show_regs(regs);
 140         print_backtrace((unsigned long *)regs->gpr[1]);
 141         panic("Exception");
 142 }
 143
 144 void
 145 MachineCheckException(struct pt_regs *regs)
 146 {
 147         unsigned long fixup, val;
 148 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
 149         u32 value2;
 150         int corr_ecc = 0;
 151         int uncorr_ecc = 0;
 152 #endif
 153
 154         if ((fixup = search_exception_table(regs->nip)) != 0) {
 155                 regs->nip = fixup;
 156                 val = mfspr(MCSR);
 157                 /* Clear MCSR */
 158                 mtspr(SPRN_MCSR, val);
 159                 return;
 160         }
 161
 162 #if defined(CONFIG_CMD_KGDB)
 163         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 164                 return;
 165 #endif
 166
 167         printf("Machine Check Exception.\n");
 168         printf("Caused by (from msr): ");
 169         printf("regs %p ", regs);
 170
 171         val = get_esr();
 172
 173 #if !defined(CONFIG_440)
 174         if (val& ESR_IMCP) {
 175                 printf("Instruction");
 176                 mtspr(ESR, val & ~ESR_IMCP);
 177         } else {
 178                 printf("Data");
 179         }
 180         printf(" machine check.\n");
 181
 182 #elif defined(CONFIG_440)
 183         if (val& ESR_IMCP){
 184                 printf("Instruction Synchronous Machine Check exception\n");
 185                 mtspr(SPRN_ESR, val & ~ESR_IMCP);
 186         } else {
 187                 val = mfspr(MCSR);
 188                 if (val & MCSR_IB)
 189                         printf("Instruction Read PLB Error\n");
 190                 if (val & MCSR_DRB)
 191                         printf("Data Read PLB Error\n");
 192                 if (val & MCSR_DWB)
 193                         printf("Data Write PLB Error\n");
 194                 if (val & MCSR_TLBP)
 195                         printf("TLB Parity Error\n");
 196                 if (val & MCSR_ICP){
 197                         /*flush_instruction_cache(); */
 198                         printf("I-Cache Parity Error\n");
 199                 }
 200                 if (val & MCSR_DCSP)
 201                         printf("D-Cache Search Parity Error\n");
 202                 if (val & MCSR_DCFP)
 203                         printf("D-Cache Flush Parity Error\n");
 204                 if (val & MCSR_IMPE)
 205                         printf("Machine Check exception is imprecise\n");
 206
 207                 /* Clear MCSR */
 208                 mtspr(SPRN_MCSR, val);
 209         }
 210 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
 211         mfsdram(DDR0_00, val) ;
 212         printf("DDR0: DDR0_00 %p\n", val);
 213         val = (val >> 16) & 0xff;
 214         if (val & 0x80)
 215                 printf("DDR0: At least one interrupt active\n");
 216         if (val & 0x40)
 217                 printf("DDR0: DRAM initialization complete.\n");
 218         if (val & 0x20) {
 219                 printf("DDR0: Multiple uncorrectable ECC events.\n");
 220                 uncorr_ecc = 1;
 221         }
 222         if (val & 0x10) {
 223                 printf("DDR0: Single uncorrectable ECC event.\n");
 224                 uncorr_ecc = 1;
 225         }
 226         if (val & 0x08) {
 227                 printf("DDR0: Multiple correctable ECC events.\n");
 228                 corr_ecc = 1;
 229         }
 230         if (val & 0x04) {
 231                 printf("DDR0: Single correctable ECC event.\n");
 232                 corr_ecc = 1;
 233         }
 234         if (val & 0x02)
 235                 printf("Multiple accesses outside the defined"
 236                        " physical memory space detected\n");
 237         if (val & 0x01)
 238                 printf("DDR0: Single access outside the defined"
 239                        " physical memory space detected.\n");
 240
 241         mfsdram(DDR0_01, val);
 242         val = (val >> 8) & 0x7;
 243         switch (val ) {
 244         case 0:
 245                 printf("DDR0: Write Out-of-Range command\n");
 246                 break;
 247         case 1:
 248                 printf("DDR0: Read Out-of-Range command\n");
 249                 break;
 250         case 2:
 251                 printf("DDR0: Masked write Out-of-Range command\n");
 252                 break;
 253         case 4:
 254                 printf("DDR0: Wrap write Out-of-Range command\n");
 255                 break;
 256         case 5:
 257                 printf("DDR0: Wrap read Out-of-Range command\n");
 258                 break;
 259         default:
 260                 mfsdram(DDR0_01, value2);
 261                 printf("DDR0: No DDR0 error know 0x%x %p\n", val, value2);
 262         }
 263         mfsdram(DDR0_23, val);
 264         if (((val >> 16) & 0xff) && corr_ecc)
 265                 printf("DDR0: Syndrome for correctable ECC event 0x%x\n",
 266                        (val >> 16) & 0xff);
 267         mfsdram(DDR0_23, val);
 268         if (((val >> 8) & 0xff) && uncorr_ecc)
 269                 printf("DDR0: Syndrome for uncorrectable ECC event 0x%x\n",
 270                        (val >> 8) & 0xff);
 271         mfsdram(DDR0_33, val);
 272         if (val)
 273                 printf("DDR0: Address of command that caused an "
 274                        "Out-of-Range interrupt %p\n", val);
 275         mfsdram(DDR0_34, val);
 276         if (val && uncorr_ecc)
 277                 printf("DDR0: Address of uncorrectable ECC event %p\n", val);
 278         mfsdram(DDR0_35, val);
 279         if (val && uncorr_ecc)
 280                 printf("DDR0: Address of uncorrectable ECC event %p\n", val);
 281         mfsdram(DDR0_36, val);
 282         if (val && uncorr_ecc)
 283                 printf("DDR0: Data of uncorrectable ECC event 0x%08x\n", val);
 284         mfsdram(DDR0_37, val);
 285         if (val && uncorr_ecc)
 286                 printf("DDR0: Data of uncorrectable ECC event 0x%08x\n", val);
 287         mfsdram(DDR0_38, val);
 288         if (val && corr_ecc)
 289                 printf("DDR0: Address of correctable ECC event %p\n", val);
 290         mfsdram(DDR0_39, val);
 291         if (val && corr_ecc)
 292                 printf("DDR0: Address of correctable ECC event %p\n", val);
 293         mfsdram(DDR0_40, val);
 294         if (val && corr_ecc)
 295                 printf("DDR0: Data of correctable ECC event 0x%08x\n", val);
 296         mfsdram(DDR0_41, val);
 297         if (val && corr_ecc)
 298                 printf("DDR0: Data of correctable ECC event 0x%08x\n", val);
 299 #endif /* CONFIG_440EPX */
 300 #endif /* CONFIG_440 */
 301         show_regs(regs);
 302         print_backtrace((unsigned long *)regs->gpr[1]);
 303         panic("machine check");
 304 }
 305
 306 void
 307 AlignmentException(struct pt_regs *regs)
 308 {
 309 #if defined(CONFIG_CMD_KGDB)
 310         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 311                 return;
 312 #endif
 313
 314         show_regs(regs);
 315         print_backtrace((unsigned long *)regs->gpr[1]);
 316         panic("Alignment Exception");
 317 }
 318
 319 void
 320 ProgramCheckException(struct pt_regs *regs)
 321 {
 322         long esr_val;
 323
 324 #if defined(CONFIG_CMD_KGDB)
 325         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 326                 return;
 327 #endif
 328
 329         show_regs(regs);
 330
 331         esr_val = get_esr();
 332         if( esr_val & ESR_PIL )
 333                 printf( "** Illegal Instruction **\n" );
 334         else if( esr_val & ESR_PPR )
 335                 printf( "** Privileged Instruction **\n" );
 336         else if( esr_val & ESR_PTR )
 337                 printf( "** Trap Instruction **\n" );
 338
 339         print_backtrace((unsigned long *)regs->gpr[1]);
 340         panic("Program Check Exception");
 341 }
 342
 343 void
 344 DecrementerPITException(struct pt_regs *regs)
 345 {
 346         /*
 347          * Reset PIT interrupt
 348          */
 349         set_tsr(0x08000000);
 350
 351         /*
 352          * Call timer_interrupt routine in interrupts.c
 353          */
 354         timer_interrupt(NULL);
 355 }
 356
 357
 358 void
 359 UnknownException(struct pt_regs *regs)
 360 {
 361 #if defined(CONFIG_CMD_KGDB)
 362         if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 363                 return;
 364 #endif
 365
 366         printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 367                regs->nip, regs->msr, regs->trap);
 368         _exception(0, regs);
 369 }
 370
 371 void
 372 DebugException(struct pt_regs *regs)
 373 {
 374         printf("Debugger trap at @ %lx\n", regs->nip );
 375         show_regs(regs);
 376 #if defined(CONFIG_CMD_BEDBUG)
 377         do_bedbug_breakpoint( regs );
 378 #endif
 379 }
 380
 381 /* Probe an address by reading.  If not present, return -1, otherwise
 382  * return 0.
 383  */
 384 int
 385 addr_probe(uint *addr)
 386 {
 387 #if 0
 388         int     retval;
 389
 390         __asm__ __volatile__(                   \
 391                 "1:     lwz %0,0(%1)\n"         \
 392                 "       eieio\n"                \
 393                 "       li %0,0\n"              \
 394                 "2:\n"                          \
 395                 ".section .fixup,\"ax\"\n"      \
 396                 "3:     li %0,-1\n"             \
 397                 "       b 2b\n"                 \
 398                 ".section __ex_table,\"a\"\n"   \
 399                 "       .align 2\n"             \
 400                 "       .long 1b,3b\n"          \
 401                 ".text"                         \
 402                 : "=r" (retval) : "r"(addr));
 403
 404         return (retval);
 405 #endif
 406         return 0;
 407 }