arch/m68k/kernel/traps.c

   1 /*
   2  *  linux/arch/m68k/kernel/traps.c
   3  *
   4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
   5  *
   6  *  68040 fixes by Michael Rausch
   7  *  68040 fixes by Martin Apel
   8  *  68040 fixes and writeback by Richard Zidlicky
   9  *  68060 fixes by Roman Hodek
  10  *  68060 fixes by Jesper Skov
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 /*
  18  * Sets up all exception vectors
  19  */
  20
  21 #include <linux/sched.h>
  22 #include <linux/signal.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/user.h>
  27 #include <linux/string.h>
  28 #include <linux/linkage.h>
  29 #include <linux/init.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/kallsyms.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/fpu.h>
  35 #include <asm/system.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/traps.h>
  38 #include <asm/pgalloc.h>
  39 #include <asm/machdep.h>
  40 #include <asm/siginfo.h>
  41
  42
  43 static const char *vec_names[] = {
  44         [VEC_RESETSP]   = "RESET SP",
  45         [VEC_RESETPC]   = "RESET PC",
  46         [VEC_BUSERR]    = "BUS ERROR",
  47         [VEC_ADDRERR]   = "ADDRESS ERROR",
  48         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
  49         [VEC_ZERODIV]   = "ZERO DIVIDE",
  50         [VEC_CHK]       = "CHK",
  51         [VEC_TRAP]      = "TRAPcc",
  52         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
  53         [VEC_TRACE]     = "TRACE",
  54         [VEC_LINE10]    = "LINE 1010",
  55         [VEC_LINE11]    = "LINE 1111",
  56         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
  57         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
  58         [VEC_FORMAT]    = "FORMAT ERROR",
  59         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
  60         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
  61         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
  62         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
  63         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
  64         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
  65         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
  66         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
  67         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
  68         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
  69         [VEC_INT1]      = "LEVEL 1 INT",
  70         [VEC_INT2]      = "LEVEL 2 INT",
  71         [VEC_INT3]      = "LEVEL 3 INT",
  72         [VEC_INT4]      = "LEVEL 4 INT",
  73         [VEC_INT5]      = "LEVEL 5 INT",
  74         [VEC_INT6]      = "LEVEL 6 INT",
  75         [VEC_INT7]      = "LEVEL 7 INT",
  76         [VEC_SYS]       = "SYSCALL",
  77         [VEC_TRAP1]     = "TRAP #1",
  78         [VEC_TRAP2]     = "TRAP #2",
  79         [VEC_TRAP3]     = "TRAP #3",
  80         [VEC_TRAP4]     = "TRAP #4",
  81         [VEC_TRAP5]     = "TRAP #5",
  82         [VEC_TRAP6]     = "TRAP #6",
  83         [VEC_TRAP7]     = "TRAP #7",
  84         [VEC_TRAP8]     = "TRAP #8",
  85         [VEC_TRAP9]     = "TRAP #9",
  86         [VEC_TRAP10]    = "TRAP #10",
  87         [VEC_TRAP11]    = "TRAP #11",
  88         [VEC_TRAP12]    = "TRAP #12",
  89         [VEC_TRAP13]    = "TRAP #13",
  90         [VEC_TRAP14]    = "TRAP #14",
  91         [VEC_TRAP15]    = "TRAP #15",
  92         [VEC_FPBRUC]    = "FPCP BSUN",
  93         [VEC_FPIR]      = "FPCP INEXACT",
  94         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
  95         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
  96         [VEC_FPOE]      = "FPCP OPERAND ERROR",
  97         [VEC_FPOVER]    = "FPCP OVERFLOW",
  98         [VEC_FPNAN]     = "FPCP SNAN",
  99         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
 100         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 101         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 102         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 103         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 104         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 105         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 106         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 107         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 108 };
 109
 110 static const char *space_names[] = {
 111         [0]             = "Space 0",
 112         [USER_DATA]     = "User Data",
 113         [USER_PROGRAM]  = "User Program",
 114 #ifndef CONFIG_SUN3
 115         [3]             = "Space 3",
 116 #else
 117         [FC_CONTROL]    = "Control",
 118 #endif
 119         [4]             = "Space 4",
 120         [SUPER_DATA]    = "Super Data",
 121         [SUPER_PROGRAM] = "Super Program",
 122         [CPU_SPACE]     = "CPU"
 123 };
 124
 125 void die_if_kernel(char *,struct pt_regs *,int);
 126 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 127                              unsigned long error_code);
 128 int send_fault_sig(struct pt_regs *regs);
 129
 130 asmlinkage void trap_c(struct frame *fp);
 131
 132 #if defined (CONFIG_M68060)
 133 static inline void access_error060 (struct frame *fp)
 134 {
 135         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
 136
 137 #ifdef DEBUG
 138         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 139 #endif
 140
 141         if (fslw & MMU060_BPE) {
 142                 /* branch prediction error -> clear branch cache */
 143                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 144                                       "orl   #0x00400000,%/d0\n\t"
 145                                       "movec %/d0,%/cacr"
 146                                       : : : "d0" );
 147                 /* return if there's no other error */
 148                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 149                         return;
 150         }
 151
 152         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 153                 unsigned long errorcode;
 154                 unsigned long addr = fp->un.fmt4.effaddr;
 155
 156                 if (fslw & MMU060_MA)
 157                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 158
 159                 errorcode = 1;
 160                 if (fslw & MMU060_DESC_ERR) {
 161                         __flush_tlb040_one(addr);
 162                         errorcode = 0;
 163                 }
 164                 if (fslw & MMU060_W)
 165                         errorcode |= 2;
 166 #ifdef DEBUG
 167                 printk("errorcode = %d\n", errorcode );
 168 #endif
 169                 do_page_fault(&fp->ptregs, addr, errorcode);
 170         } else if (fslw & (MMU060_SEE)){
 171                 /* Software Emulation Error.
 172                  * fault during mem_read/mem_write in ifpsp060/os.S
 173                  */
 174                 send_fault_sig(&fp->ptregs);
 175         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 176                    send_fault_sig(&fp->ptregs) > 0) {
 177                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 178                 printk( "68060 access error, fslw=%lx\n", fslw );
 179                 trap_c( fp );
 180         }
 181 }
 182 #endif /* CONFIG_M68060 */
 183
 184 #if defined (CONFIG_M68040)
 185 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 186 {
 187         unsigned long mmusr;
 188         mm_segment_t old_fs = get_fs();
 189
 190         set_fs(MAKE_MM_SEG(wbs));
 191
 192         if (iswrite)
 193                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 194         else
 195                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 196
 197         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 198
 199         set_fs(old_fs);
 200
 201         return mmusr;
 202 }
 203
 204 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 205                                    unsigned long wbd)
 206 {
 207         int res = 0;
 208         mm_segment_t old_fs = get_fs();
 209
 210         /* set_fs can not be moved, otherwise put_user() may oops */
 211         set_fs(MAKE_MM_SEG(wbs));
 212
 213         switch (wbs & WBSIZ_040) {
 214         case BA_SIZE_BYTE:
 215                 res = put_user(wbd & 0xff, (char __user *)wba);
 216                 break;
 217         case BA_SIZE_WORD:
 218                 res = put_user(wbd & 0xffff, (short __user *)wba);
 219                 break;
 220         case BA_SIZE_LONG:
 221                 res = put_user(wbd, (int __user *)wba);
 222                 break;
 223         }
 224
 225         /* set_fs can not be moved, otherwise put_user() may oops */
 226         set_fs(old_fs);
 227
 228
 229 #ifdef DEBUG
 230         printk("do_040writeback1, res=%d\n",res);
 231 #endif
 232
 233         return res;
 234 }
 235
 236 /* after an exception in a writeback the stack frame corresponding
 237  * to that exception is discarded, set a few bits in the old frame
 238  * to simulate what it should look like
 239  */
 240 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 241 {
 242         fp->un.fmt7.faddr = wba;
 243         fp->un.fmt7.ssw = wbs & 0xff;
 244         if (wba != current->thread.faddr)
 245             fp->un.fmt7.ssw |= MA_040;
 246 }
 247
 248 static inline void do_040writebacks(struct frame *fp)
 249 {
 250         int res = 0;
 251 #if 0
 252         if (fp->un.fmt7.wb1s & WBV_040)
 253                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 254 #endif
 255
 256         if ((fp->un.fmt7.wb2s & WBV_040) &&
 257             !(fp->un.fmt7.wb2s & WBTT_040)) {
 258                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 259                                        fp->un.fmt7.wb2d);
 260                 if (res)
 261                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 262                 else
 263                         fp->un.fmt7.wb2s = 0;
 264         }
 265
 266         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 267         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 268                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 269                                        fp->un.fmt7.wb3d);
 270                 if (res)
 271                     {
 272                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 273
 274                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 275                         fp->un.fmt7.wb3s &= (~WBV_040);
 276                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 277                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 278                     }
 279                 else
 280                         fp->un.fmt7.wb3s = 0;
 281         }
 282
 283         if (res)
 284                 send_fault_sig(&fp->ptregs);
 285 }
 286
 287 /*
 288  * called from sigreturn(), must ensure userspace code didn't
 289  * manipulate exception frame to circumvent protection, then complete
 290  * pending writebacks
 291  * we just clear TM2 to turn it into a userspace access
 292  */
 293 asmlinkage void berr_040cleanup(struct frame *fp)
 294 {
 295         fp->un.fmt7.wb2s &= ~4;
 296         fp->un.fmt7.wb3s &= ~4;
 297
 298         do_040writebacks(fp);
 299 }
 300
 301 static inline void access_error040(struct frame *fp)
 302 {
 303         unsigned short ssw = fp->un.fmt7.ssw;
 304         unsigned long mmusr;
 305
 306 #ifdef DEBUG
 307         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 308         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 309                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 310         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 311                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 312                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 313 #endif
 314
 315         if (ssw & ATC_040) {
 316                 unsigned long addr = fp->un.fmt7.faddr;
 317                 unsigned long errorcode;
 318
 319                 /*
 320                  * The MMU status has to be determined AFTER the address
 321                  * has been corrected if there was a misaligned access (MA).
 322                  */
 323                 if (ssw & MA_040)
 324                         addr = (addr + 7) & -8;
 325
 326                 /* MMU error, get the MMUSR info for this access */
 327                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 328 #ifdef DEBUG
 329                 printk("mmusr = %lx\n", mmusr);
 330 #endif
 331                 errorcode = 1;
 332                 if (!(mmusr & MMU_R_040)) {
 333                         /* clear the invalid atc entry */
 334                         __flush_tlb040_one(addr);
 335                         errorcode = 0;
 336                 }
 337
 338                 /* despite what documentation seems to say, RMW
 339                  * accesses have always both the LK and RW bits set */
 340                 if (!(ssw & RW_040) || (ssw & LK_040))
 341                         errorcode |= 2;
 342
 343                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 344 #ifdef DEBUG
 345                         printk("do_page_fault() !=0\n");
 346 #endif
 347                         if (user_mode(&fp->ptregs)){
 348                                 /* delay writebacks after signal delivery */
 349 #ifdef DEBUG
 350                                 printk(".. was usermode - return\n");
 351 #endif
 352                                 return;
 353                         }
 354                         /* disable writeback into user space from kernel
 355                          * (if do_page_fault didn't fix the mapping,
 356                          * the writeback won't do good)
 357                          */
 358 disable_wb:
 359 #ifdef DEBUG
 360                         printk(".. disabling wb2\n");
 361 #endif
 362                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 363                                 fp->un.fmt7.wb2s &= ~WBV_040;
 364                         if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
 365                                 fp->un.fmt7.wb3s &= ~WBV_040;
 366                 }
 367         } else {
 368                 /* In case of a bus error we either kill the process or expect
 369                  * the kernel to catch the fault, which then is also responsible
 370                  * for cleaning up the mess.
 371                  */
 372                 current->thread.signo = SIGBUS;
 373                 current->thread.faddr = fp->un.fmt7.faddr;
 374                 if (send_fault_sig(&fp->ptregs) >= 0)
 375                         printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
 376                                fp->un.fmt7.faddr);
 377                 goto disable_wb;
 378         }
 379
 380         do_040writebacks(fp);
 381 }
 382 #endif /* CONFIG_M68040 */
 383
 384 #if defined(CONFIG_SUN3)
 385 #include <asm/sun3mmu.h>
 386
 387 extern int mmu_emu_handle_fault (unsigned long, int, int);
 388
 389 /* sun3 version of bus_error030 */
 390
 391 static inline void bus_error030 (struct frame *fp)
 392 {
 393         unsigned char buserr_type = sun3_get_buserr ();
 394         unsigned long addr, errorcode;
 395         unsigned short ssw = fp->un.fmtb.ssw;
 396         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 397
 398 #ifdef DEBUG
 399         if (ssw & (FC | FB))
 400                 printk ("Instruction fault at %#010lx\n",
 401                         ssw & FC ?
 402                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 403                         :
 404                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 405         if (ssw & DF)
 406                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 407                         ssw & RW ? "read" : "write",
 408                         fp->un.fmtb.daddr,
 409                         space_names[ssw & DFC], fp->ptregs.pc);
 410 #endif
 411
 412         /*
 413          * Check if this page should be demand-mapped. This needs to go before
 414          * the testing for a bad kernel-space access (demand-mapping applies
 415          * to kernel accesses too).
 416          */
 417
 418         if ((ssw & DF)
 419             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 420                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 421                         return;
 422         }
 423
 424         /* Check for kernel-space pagefault (BAD). */
 425         if (fp->ptregs.sr & PS_S) {
 426                 /* kernel fault must be a data fault to user space */
 427                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 428                      // try checking the kernel mappings before surrender
 429                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 430                           return;
 431                         /* instruction fault or kernel data fault! */
 432                         if (ssw & (FC | FB))
 433                                 printk ("Instruction fault at %#010lx\n",
 434                                         fp->ptregs.pc);
 435                         if (ssw & DF) {
 436                                 /* was this fault incurred testing bus mappings? */
 437                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 438                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 439                                         send_fault_sig(&fp->ptregs);
 440                                         return;
 441                                 }
 442
 443                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 444                                         ssw & RW ? "read" : "write",
 445                                         fp->un.fmtb.daddr,
 446                                         space_names[ssw & DFC], fp->ptregs.pc);
 447                         }
 448                         printk ("BAD KERNEL BUSERR\n");
 449
 450                         die_if_kernel("Oops", &fp->ptregs,0);
 451                         force_sig(SIGKILL, current);
 452                         return;
 453                 }
 454         } else {
 455                 /* user fault */
 456                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 457                         /* not an instruction fault or data fault! BAD */
 458                         panic ("USER BUSERR w/o instruction or data fault");
 459         }
 460
 461
 462         /* First handle the data fault, if any.  */
 463         if (ssw & DF) {
 464                 addr = fp->un.fmtb.daddr;
 465
 466 // errorcode bit 0:     0 -> no page            1 -> protection fault
 467 // errorcode bit 1:     0 -> read fault         1 -> write fault
 468
 469 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 470 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 471
 472                 if (buserr_type & SUN3_BUSERR_PROTERR)
 473                         errorcode = 0x01;
 474                 else if (buserr_type & SUN3_BUSERR_INVALID)
 475                         errorcode = 0x00;
 476                 else {
 477 #ifdef DEBUG
 478                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 479                         printk ("invalid %s access at %#lx from pc %#lx\n",
 480                                 !(ssw & RW) ? "write" : "read", addr,
 481                                 fp->ptregs.pc);
 482 #endif
 483                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 484                         force_sig (SIGBUS, current);
 485                         return;
 486                 }
 487
 488 //todo: wtf is RM bit? --m
 489                 if (!(ssw & RW) || ssw & RM)
 490                         errorcode |= 0x02;
 491
 492                 /* Handle page fault. */
 493                 do_page_fault (&fp->ptregs, addr, errorcode);
 494
 495                 /* Retry the data fault now. */
 496                 return;
 497         }
 498
 499         /* Now handle the instruction fault. */
 500
 501         /* Get the fault address. */
 502         if (fp->ptregs.format == 0xA)
 503                 addr = fp->ptregs.pc + 4;
 504         else
 505                 addr = fp->un.fmtb.baddr;
 506         if (ssw & FC)
 507                 addr -= 2;
 508
 509         if (buserr_type & SUN3_BUSERR_INVALID) {
 510                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 511                         do_page_fault (&fp->ptregs, addr, 0);
 512        } else {
 513 #ifdef DEBUG
 514                 printk ("protection fault on insn access (segv).\n");
 515 #endif
 516                 force_sig (SIGSEGV, current);
 517        }
 518 }
 519 #else
 520 #if defined(CPU_M68020_OR_M68030)
 521 static inline void bus_error030 (struct frame *fp)
 522 {
 523         volatile unsigned short temp;
 524         unsigned short mmusr;
 525         unsigned long addr, errorcode;
 526         unsigned short ssw = fp->un.fmtb.ssw;
 527 #ifdef DEBUG
 528         unsigned long desc;
 529
 530         printk ("pid = %x  ", current->pid);
 531         printk ("SSW=%#06x  ", ssw);
 532
 533         if (ssw & (FC | FB))
 534                 printk ("Instruction fault at %#010lx\n",
 535                         ssw & FC ?
 536                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 537                         :
 538                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 539         if (ssw & DF)
 540                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 541                         ssw & RW ? "read" : "write",
 542                         fp->un.fmtb.daddr,
 543                         space_names[ssw & DFC], fp->ptregs.pc);
 544 #endif
 545
 546         /* ++andreas: If a data fault and an instruction fault happen
 547            at the same time map in both pages.  */
 548
 549         /* First handle the data fault, if any.  */
 550         if (ssw & DF) {
 551                 addr = fp->un.fmtb.daddr;
 552
 553 #ifdef DEBUG
 554                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 555                               "pmove %%psr,%1"
 556                               : "=a&" (desc), "=m" (temp)
 557                               : "a" (addr), "d" (ssw));
 558 #else
 559                 asm volatile ("ptestr %2,%1@,#7\n\t"
 560                               "pmove %%psr,%0"
 561                               : "=m" (temp) : "a" (addr), "d" (ssw));
 562 #endif
 563                 mmusr = temp;
 564
 565 #ifdef DEBUG
 566                 printk("mmusr is %#x for addr %#lx in task %p\n",
 567                        mmusr, addr, current);
 568                 printk("descriptor address is %#lx, contents %#lx\n",
 569                        __va(desc), *(unsigned long *)__va(desc));
 570 #endif
 571
 572                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 573                 if (!(ssw & RW) || (ssw & RM))
 574                         errorcode |= 2;
 575
 576                 if (mmusr & (MMU_I | MMU_WP)) {
 577                         if (ssw & 4) {
 578                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 579                                        ssw & RW ? "read" : "write",
 580                                        fp->un.fmtb.daddr,
 581                                        space_names[ssw & DFC], fp->ptregs.pc);
 582                                 goto buserr;
 583                         }
 584                         /* Don't try to do anything further if an exception was
 585                            handled. */
 586                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 587                                 return;
 588                 } else if (!(mmusr & MMU_I)) {
 589                         /* probably a 020 cas fault */
 590                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 591                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 592                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 593                         printk("invalid %s access at %#lx from pc %#lx\n",
 594                                !(ssw & RW) ? "write" : "read", addr,
 595                                fp->ptregs.pc);
 596                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 597                         force_sig(SIGSEGV, current);
 598                         return;
 599                 } else {
 600 #if 0
 601                         static volatile long tlong;
 602 #endif
 603
 604                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 605                                !(ssw & RW) ? "write" : "read", addr,
 606                                fp->ptregs.pc, ssw);
 607                         asm volatile ("ptestr #1,%1@,#0\n\t"
 608                                       "pmove %%psr,%0"
 609                                       : "=m" (temp)
 610                                       : "a" (addr));
 611                         mmusr = temp;
 612
 613                         printk ("level 0 mmusr is %#x\n", mmusr);
 614 #if 0
 615                         asm volatile ("pmove %%tt0,%0"
 616                                       : "=m" (tlong));
 617                         printk("tt0 is %#lx, ", tlong);
 618                         asm volatile ("pmove %%tt1,%0"
 619                                       : "=m" (tlong));
 620                         printk("tt1 is %#lx\n", tlong);
 621 #endif
 622 #ifdef DEBUG
 623                         printk("Unknown SIGSEGV - 1\n");
 624 #endif
 625                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 626                         force_sig(SIGSEGV, current);
 627                         return;
 628                 }
 629
 630                 /* setup an ATC entry for the access about to be retried */
 631                 if (!(ssw & RW) || (ssw & RM))
 632                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 633                                       : "a" (addr), "d" (ssw));
 634                 else
 635                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 636                                       : "a" (addr), "d" (ssw));
 637         }
 638
 639         /* Now handle the instruction fault. */
 640
 641         if (!(ssw & (FC|FB)))
 642                 return;
 643
 644         if (fp->ptregs.sr & PS_S) {
 645                 printk("Instruction fault at %#010lx\n",
 646                         fp->ptregs.pc);
 647         buserr:
 648                 printk ("BAD KERNEL BUSERR\n");
 649                 die_if_kernel("Oops",&fp->ptregs,0);
 650                 force_sig(SIGKILL, current);
 651                 return;
 652         }
 653
 654         /* get the fault address */
 655         if (fp->ptregs.format == 10)
 656                 addr = fp->ptregs.pc + 4;
 657         else
 658                 addr = fp->un.fmtb.baddr;
 659         if (ssw & FC)
 660                 addr -= 2;
 661
 662         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 663                 /* Insn fault on same page as data fault.  But we
 664                    should still create the ATC entry.  */
 665                 goto create_atc_entry;
 666
 667 #ifdef DEBUG
 668         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 669                       "pmove %%psr,%1"
 670                       : "=a&" (desc), "=m" (temp)
 671                       : "a" (addr));
 672 #else
 673         asm volatile ("ptestr #1,%1@,#7\n\t"
 674                       "pmove %%psr,%0"
 675                       : "=m" (temp) : "a" (addr));
 676 #endif
 677         mmusr = temp;
 678
 679 #ifdef DEBUG
 680         printk ("mmusr is %#x for addr %#lx in task %p\n",
 681                 mmusr, addr, current);
 682         printk ("descriptor address is %#lx, contents %#lx\n",
 683                 __va(desc), *(unsigned long *)__va(desc));
 684 #endif
 685
 686         if (mmusr & MMU_I)
 687                 do_page_fault (&fp->ptregs, addr, 0);
 688         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 689                 printk ("invalid insn access at %#lx from pc %#lx\n",
 690                         addr, fp->ptregs.pc);
 691 #ifdef DEBUG
 692                 printk("Unknown SIGSEGV - 2\n");
 693 #endif
 694                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 695                 force_sig(SIGSEGV, current);
 696                 return;
 697         }
 698
 699 create_atc_entry:
 700         /* setup an ATC entry for the access about to be retried */
 701         asm volatile ("ploadr #2,%0@" : /* no outputs */
 702                       : "a" (addr));
 703 }
 704 #endif /* CPU_M68020_OR_M68030 */
 705 #endif /* !CONFIG_SUN3 */
 706
 707 asmlinkage void buserr_c(struct frame *fp)
 708 {
 709         /* Only set esp0 if coming from user mode */
 710         if (user_mode(&fp->ptregs))
 711                 current->thread.esp0 = (unsigned long) fp;
 712
 713 #ifdef DEBUG
 714         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 715 #endif
 716
 717         switch (fp->ptregs.format) {
 718 #if defined (CONFIG_M68060)
 719         case 4:                         /* 68060 access error */
 720           access_error060 (fp);
 721           break;
 722 #endif
 723 #if defined (CONFIG_M68040)
 724         case 0x7:                       /* 68040 access error */
 725           access_error040 (fp);
 726           break;
 727 #endif
 728 #if defined (CPU_M68020_OR_M68030)
 729         case 0xa:
 730         case 0xb:
 731           bus_error030 (fp);
 732           break;
 733 #endif
 734         default:
 735           die_if_kernel("bad frame format",&fp->ptregs,0);
 736 #ifdef DEBUG
 737           printk("Unknown SIGSEGV - 4\n");
 738 #endif
 739           force_sig(SIGSEGV, current);
 740         }
 741 }
 742
 743
 744 static int kstack_depth_to_print = 48;
 745
 746 void show_trace(unsigned long *stack)
 747 {
 748         unsigned long *endstack;
 749         unsigned long addr;
 750         int i;
 751
 752         printk("Call Trace:");
 753         addr = (unsigned long)stack + THREAD_SIZE - 1;
 754         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 755         i = 0;
 756         while (stack + 1 <= endstack) {
 757                 addr = *stack++;
 758                 /*
 759                  * If the address is either in the text segment of the
 760                  * kernel, or in the region which contains vmalloc'ed
 761                  * memory, it *may* be the address of a calling
 762                  * routine; if so, print it so that someone tracing
 763                  * down the cause of the crash will be able to figure
 764                  * out the call path that was taken.
 765                  */
 766                 if (__kernel_text_address(addr)) {
 767 #ifndef CONFIG_KALLSYMS
 768                         if (i % 5 == 0)
 769                                 printk("\n       ");
 770 #endif
 771                         printk(" [<%08lx>] %pS\n", addr, (void *)addr);
 772                         i++;
 773                 }
 774         }
 775         printk("\n");
 776 }
 777
 778 void show_registers(struct pt_regs *regs)
 779 {
 780         struct frame *fp = (struct frame *)regs;
 781         mm_segment_t old_fs = get_fs();
 782         u16 c, *cp;
 783         unsigned long addr;
 784         int i;
 785
 786         print_modules();
 787         printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
 788         printk("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
 789         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 790                regs->d0, regs->d1, regs->d2, regs->d3);
 791         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 792                regs->d4, regs->d5, regs->a0, regs->a1);
 793
 794         printk("Process %s (pid: %d, task=%p)\n",
 795                 current->comm, task_pid_nr(current), current);
 796         addr = (unsigned long)&fp->un;
 797         printk("Frame format=%X ", regs->format);
 798         switch (regs->format) {
 799         case 0x2:
 800                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 801                 addr += sizeof(fp->un.fmt2);
 802                 break;
 803         case 0x3:
 804                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 805                 addr += sizeof(fp->un.fmt3);
 806                 break;
 807         case 0x4:
 808                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 809                         : "eff addr=%08lx pc=%08lx\n"),
 810                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 811                 addr += sizeof(fp->un.fmt4);
 812                 break;
 813         case 0x7:
 814                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 815                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 816                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 817                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 818                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 819                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 820                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 821                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 822                 printk("push data: %08lx %08lx %08lx %08lx\n",
 823                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 824                         fp->un.fmt7.pd3);
 825                 addr += sizeof(fp->un.fmt7);
 826                 break;
 827         case 0x9:
 828                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 829                 addr += sizeof(fp->un.fmt9);
 830                 break;
 831         case 0xa:
 832                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 833                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 834                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 835                 addr += sizeof(fp->un.fmta);
 836                 break;
 837         case 0xb:
 838                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 839                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 840                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 841                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 842                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 843                 addr += sizeof(fp->un.fmtb);
 844                 break;
 845         default:
 846                 printk("\n");
 847         }
 848         show_stack(NULL, (unsigned long *)addr);
 849
 850         printk("Code:");
 851         set_fs(KERNEL_DS);
 852         cp = (u16 *)regs->pc;
 853         for (i = -8; i < 16; i++) {
 854                 if (get_user(c, cp + i) && i >= 0) {
 855                         printk(" Bad PC value.");
 856                         break;
 857                 }
 858                 printk(i ? " %04x" : " <%04x>", c);
 859         }
 860         set_fs(old_fs);
 861         printk ("\n");
 862 }
 863
 864 void show_stack(struct task_struct *task, unsigned long *stack)
 865 {
 866         unsigned long *p;
 867         unsigned long *endstack;
 868         int i;
 869
 870         if (!stack) {
 871                 if (task)
 872                         stack = (unsigned long *)task->thread.esp0;
 873                 else
 874                         stack = (unsigned long *)&stack;
 875         }
 876         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 877
 878         printk("Stack from %08lx:", (unsigned long)stack);
 879         p = stack;
 880         for (i = 0; i < kstack_depth_to_print; i++) {
 881                 if (p + 1 > endstack)
 882                         break;
 883                 if (i % 8 == 0)
 884                         printk("\n       ");
 885                 printk(" %08lx", *p++);
 886         }
 887         printk("\n");
 888         show_trace(stack);
 889 }
 890
 891 /*
 892  * The architecture-independent backtrace generator
 893  */
 894 void dump_stack(void)
 895 {
 896         unsigned long stack;
 897
 898         show_trace(&stack);
 899 }
 900
 901 EXPORT_SYMBOL(dump_stack);
 902
 903 /*
 904  * The vector number returned in the frame pointer may also contain
 905  * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
 906  * 2 bits, and upper 2 bits. So we need to mask out the real vector
 907  * number before using it in comparisons. You don't need to do this on
 908  * real 68k parts, but it won't hurt either.
 909  */
 910
 911 void bad_super_trap (struct frame *fp)
 912 {
 913         int vector = (fp->ptregs.vector >> 2) & 0xff;
 914
 915         console_verbose();
 916         if (vector < ARRAY_SIZE(vec_names))
 917                 printk ("*** %s ***   FORMAT=%X\n",
 918                         vec_names[vector],
 919                         fp->ptregs.format);
 920         else
 921                 printk ("*** Exception %d ***   FORMAT=%X\n",
 922                         vector, fp->ptregs.format);
 923         if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
 924                 unsigned short ssw = fp->un.fmtb.ssw;
 925
 926                 printk ("SSW=%#06x  ", ssw);
 927
 928                 if (ssw & RC)
 929                         printk ("Pipe stage C instruction fault at %#010lx\n",
 930                                 (fp->ptregs.format) == 0xA ?
 931                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
 932                 if (ssw & RB)
 933                         printk ("Pipe stage B instruction fault at %#010lx\n",
 934                                 (fp->ptregs.format) == 0xA ?
 935                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 936                 if (ssw & DF)
 937                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 938                                 ssw & RW ? "read" : "write",
 939                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
 940                                 fp->ptregs.pc);
 941         }
 942         printk ("Current process id is %d\n", task_pid_nr(current));
 943         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
 944 }
 945
 946 asmlinkage void trap_c(struct frame *fp)
 947 {
 948         int sig;
 949         int vector = (fp->ptregs.vector >> 2) & 0xff;
 950         siginfo_t info;
 951
 952         if (fp->ptregs.sr & PS_S) {
 953                 if (vector == VEC_TRACE) {
 954                         /* traced a trapping instruction on a 68020/30,
 955                          * real exception will be executed afterwards.
 956                          */
 957                 } else if (!handle_kernel_fault(&fp->ptregs))
 958                         bad_super_trap(fp);
 959                 return;
 960         }
 961
 962         /* send the appropriate signal to the user program */
 963         switch (vector) {
 964             case VEC_ADDRERR:
 965                 info.si_code = BUS_ADRALN;
 966                 sig = SIGBUS;
 967                 break;
 968             case VEC_ILLEGAL:
 969             case VEC_LINE10:
 970             case VEC_LINE11:
 971                 info.si_code = ILL_ILLOPC;
 972                 sig = SIGILL;
 973                 break;
 974             case VEC_PRIV:
 975                 info.si_code = ILL_PRVOPC;
 976                 sig = SIGILL;
 977                 break;
 978             case VEC_COPROC:
 979                 info.si_code = ILL_COPROC;
 980                 sig = SIGILL;
 981                 break;
 982             case VEC_TRAP1:
 983             case VEC_TRAP2:
 984             case VEC_TRAP3:
 985             case VEC_TRAP4:
 986             case VEC_TRAP5:
 987             case VEC_TRAP6:
 988             case VEC_TRAP7:
 989             case VEC_TRAP8:
 990             case VEC_TRAP9:
 991             case VEC_TRAP10:
 992             case VEC_TRAP11:
 993             case VEC_TRAP12:
 994             case VEC_TRAP13:
 995             case VEC_TRAP14:
 996                 info.si_code = ILL_ILLTRP;
 997                 sig = SIGILL;
 998                 break;
 999             case VEC_FPBRUC:
1000             case VEC_FPOE:
1001             case VEC_FPNAN:
1002                 info.si_code = FPE_FLTINV;
1003                 sig = SIGFPE;
1004                 break;
1005             case VEC_FPIR:
1006                 info.si_code = FPE_FLTRES;
1007                 sig = SIGFPE;
1008                 break;
1009             case VEC_FPDIVZ:
1010                 info.si_code = FPE_FLTDIV;
1011                 sig = SIGFPE;
1012                 break;
1013             case VEC_FPUNDER:
1014                 info.si_code = FPE_FLTUND;
1015                 sig = SIGFPE;
1016                 break;
1017             case VEC_FPOVER:
1018                 info.si_code = FPE_FLTOVF;
1019                 sig = SIGFPE;
1020                 break;
1021             case VEC_ZERODIV:
1022                 info.si_code = FPE_INTDIV;
1023                 sig = SIGFPE;
1024                 break;
1025             case VEC_CHK:
1026             case VEC_TRAP:
1027                 info.si_code = FPE_INTOVF;
1028                 sig = SIGFPE;
1029                 break;
1030             case VEC_TRACE:             /* ptrace single step */
1031                 info.si_code = TRAP_TRACE;
1032                 sig = SIGTRAP;
1033                 break;
1034             case VEC_TRAP15:            /* breakpoint */
1035                 info.si_code = TRAP_BRKPT;
1036                 sig = SIGTRAP;
1037                 break;
1038             default:
1039                 info.si_code = ILL_ILLOPC;
1040                 sig = SIGILL;
1041                 break;
1042         }
1043         info.si_signo = sig;
1044         info.si_errno = 0;
1045         switch (fp->ptregs.format) {
1046             default:
1047                 info.si_addr = (void *) fp->ptregs.pc;
1048                 break;
1049             case 2:
1050                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1051                 break;
1052             case 7:
1053                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1054                 break;
1055             case 9:
1056                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1057                 break;
1058             case 10:
1059                 info.si_addr = (void *) fp->un.fmta.daddr;
1060                 break;
1061             case 11:
1062                 info.si_addr = (void *) fp->un.fmtb.daddr;
1063                 break;
1064         }
1065         force_sig_info (sig, &info, current);
1066 }
1067
1068 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1069 {
1070         if (!(fp->sr & PS_S))
1071                 return;
1072
1073         console_verbose();
1074         printk("%s: %08x\n",str,nr);
1075         show_registers(fp);
1076         add_taint(TAINT_DIE);
1077         do_exit(SIGSEGV);
1078 }
1079
1080 asmlinkage void set_esp0(unsigned long ssp)
1081 {
1082         current->thread.esp0 = ssp;
1083 }
1084
1085 /*
1086  * This function is called if an error occur while accessing
1087  * user-space from the fpsp040 code.
1088  */
1089 asmlinkage void fpsp040_die(void)
1090 {
1091         do_exit(SIGSEGV);
1092 }
1093
1094 #ifdef CONFIG_M68KFPU_EMU
1095 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1096 {
1097         siginfo_t info;
1098
1099         info.si_signo = signal;
1100         info.si_errno = 0;
1101         info.si_code = code;
1102         info.si_addr = addr;
1103         force_sig_info(signal, &info, current);
1104 }
1105 #endif