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   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/config.h>
  22 #include <linux/sched.h>
  23 #include <linux/signal.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/module.h>
  27 #include <linux/a.out.h>
  28 #include <linux/user.h>
  29 #include <linux/string.h>
  30 #include <linux/linkage.h>
  31 #include <linux/init.h>
  32 #include <linux/ptrace.h>
  33 #include <linux/kallsyms.h>
  34
  35 #include <asm/setup.h>
  36 #include <asm/fpu.h>
  37 #include <asm/system.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/traps.h>
  40 #include <asm/pgalloc.h>
  41 #include <asm/machdep.h>
  42 #include <asm/siginfo.h>
  43
  44 /* assembler routines */
  45 asmlinkage void system_call(void);
  46 asmlinkage void buserr(void);
  47 asmlinkage void trap(void);
  48 asmlinkage void inthandler(void);
  49 asmlinkage void nmihandler(void);
  50 #ifdef CONFIG_M68KFPU_EMU
  51 asmlinkage void fpu_emu(void);
  52 #endif
  53
  54 e_vector vectors[256] = {
  55         [VEC_BUSERR]    = buserr,
  56         [VEC_ADDRERR]   = trap,
  57         [VEC_ILLEGAL]   = trap,
  58         [VEC_ZERODIV]   = trap,
  59         [VEC_CHK]       = trap,
  60         [VEC_TRAP]      = trap,
  61         [VEC_PRIV]      = trap,
  62         [VEC_TRACE]     = trap,
  63         [VEC_LINE10]    = trap,
  64         [VEC_LINE11]    = trap,
  65         [VEC_RESV12]    = trap,
  66         [VEC_COPROC]    = trap,
  67         [VEC_FORMAT]    = trap,
  68         [VEC_UNINT]     = trap,
  69         [VEC_RESV16]    = trap,
  70         [VEC_RESV17]    = trap,
  71         [VEC_RESV18]    = trap,
  72         [VEC_RESV19]    = trap,
  73         [VEC_RESV20]    = trap,
  74         [VEC_RESV21]    = trap,
  75         [VEC_RESV22]    = trap,
  76         [VEC_RESV23]    = trap,
  77         [VEC_SPUR]      = inthandler,
  78         [VEC_INT1]      = inthandler,
  79         [VEC_INT2]      = inthandler,
  80         [VEC_INT3]      = inthandler,
  81         [VEC_INT4]      = inthandler,
  82         [VEC_INT5]      = inthandler,
  83         [VEC_INT6]      = inthandler,
  84         [VEC_INT7]      = inthandler,
  85         [VEC_SYS]       = system_call,
  86         [VEC_TRAP1]     = trap,
  87         [VEC_TRAP2]     = trap,
  88         [VEC_TRAP3]     = trap,
  89         [VEC_TRAP4]     = trap,
  90         [VEC_TRAP5]     = trap,
  91         [VEC_TRAP6]     = trap,
  92         [VEC_TRAP7]     = trap,
  93         [VEC_TRAP8]     = trap,
  94         [VEC_TRAP9]     = trap,
  95         [VEC_TRAP10]    = trap,
  96         [VEC_TRAP11]    = trap,
  97         [VEC_TRAP12]    = trap,
  98         [VEC_TRAP13]    = trap,
  99         [VEC_TRAP14]    = trap,
 100         [VEC_TRAP15]    = trap,
 101 };
 102
 103 /* nmi handler for the Amiga */
 104 asm(".text\n"
 105     __ALIGN_STR "\n"
 106     "nmihandler: rte");
 107
 108 /*
 109  * this must be called very early as the kernel might
 110  * use some instruction that are emulated on the 060
 111  */
 112 void __init base_trap_init(void)
 113 {
 114         if(MACH_IS_SUN3X) {
 115                 extern e_vector *sun3x_prom_vbr;
 116
 117                 __asm__ volatile ("movec %%vbr, %0" : "=r" ((void*)sun3x_prom_vbr));
 118         }
 119
 120         /* setup the exception vector table */
 121         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
 122
 123         if (CPU_IS_060) {
 124                 /* set up ISP entry points */
 125                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
 126
 127                 vectors[VEC_UNIMPII] = unimp_vec;
 128         }
 129 }
 130
 131 void __init trap_init (void)
 132 {
 133         int i;
 134
 135         for (i = 48; i < 64; i++)
 136                 if (!vectors[i])
 137                         vectors[i] = trap;
 138
 139         for (i = 64; i < 256; i++)
 140                 vectors[i] = inthandler;
 141
 142 #ifdef CONFIG_M68KFPU_EMU
 143         if (FPU_IS_EMU)
 144                 vectors[VEC_LINE11] = fpu_emu;
 145 #endif
 146
 147         if (CPU_IS_040 && !FPU_IS_EMU) {
 148                 /* set up FPSP entry points */
 149                 asmlinkage void dz_vec(void) asm ("dz");
 150                 asmlinkage void inex_vec(void) asm ("inex");
 151                 asmlinkage void ovfl_vec(void) asm ("ovfl");
 152                 asmlinkage void unfl_vec(void) asm ("unfl");
 153                 asmlinkage void snan_vec(void) asm ("snan");
 154                 asmlinkage void operr_vec(void) asm ("operr");
 155                 asmlinkage void bsun_vec(void) asm ("bsun");
 156                 asmlinkage void fline_vec(void) asm ("fline");
 157                 asmlinkage void unsupp_vec(void) asm ("unsupp");
 158
 159                 vectors[VEC_FPDIVZ] = dz_vec;
 160                 vectors[VEC_FPIR] = inex_vec;
 161                 vectors[VEC_FPOVER] = ovfl_vec;
 162                 vectors[VEC_FPUNDER] = unfl_vec;
 163                 vectors[VEC_FPNAN] = snan_vec;
 164                 vectors[VEC_FPOE] = operr_vec;
 165                 vectors[VEC_FPBRUC] = bsun_vec;
 166                 vectors[VEC_LINE11] = fline_vec;
 167                 vectors[VEC_FPUNSUP] = unsupp_vec;
 168         }
 169
 170         if (CPU_IS_060 && !FPU_IS_EMU) {
 171                 /* set up IFPSP entry points */
 172                 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
 173                 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
 174                 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
 175                 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
 176                 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
 177                 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
 178                 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
 179                 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
 180                 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
 181
 182                 vectors[VEC_FPNAN] = snan_vec6;
 183                 vectors[VEC_FPOE] = operr_vec6;
 184                 vectors[VEC_FPOVER] = ovfl_vec6;
 185                 vectors[VEC_FPUNDER] = unfl_vec6;
 186                 vectors[VEC_FPDIVZ] = dz_vec6;
 187                 vectors[VEC_FPIR] = inex_vec6;
 188                 vectors[VEC_LINE11] = fline_vec6;
 189                 vectors[VEC_FPUNSUP] = unsupp_vec6;
 190                 vectors[VEC_UNIMPEA] = effadd_vec6;
 191         }
 192
 193         /* if running on an amiga, make the NMI interrupt do nothing */
 194         if (MACH_IS_AMIGA) {
 195                 vectors[VEC_INT7] = nmihandler;
 196         }
 197 }
 198
 199
 200 static const char *vec_names[] = {
 201         [VEC_RESETSP]   = "RESET SP",
 202         [VEC_RESETPC]   = "RESET PC",
 203         [VEC_BUSERR]    = "BUS ERROR",
 204         [VEC_ADDRERR]   = "ADDRESS ERROR",
 205         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
 206         [VEC_ZERODIV]   = "ZERO DIVIDE",
 207         [VEC_CHK]       = "CHK",
 208         [VEC_TRAP]      = "TRAPcc",
 209         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
 210         [VEC_TRACE]     = "TRACE",
 211         [VEC_LINE10]    = "LINE 1010",
 212         [VEC_LINE11]    = "LINE 1111",
 213         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
 214         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
 215         [VEC_FORMAT]    = "FORMAT ERROR",
 216         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
 217         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
 218         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
 219         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
 220         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
 221         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
 222         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
 223         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
 224         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
 225         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
 226         [VEC_INT1]      = "LEVEL 1 INT",
 227         [VEC_INT2]      = "LEVEL 2 INT",
 228         [VEC_INT3]      = "LEVEL 3 INT",
 229         [VEC_INT4]      = "LEVEL 4 INT",
 230         [VEC_INT5]      = "LEVEL 5 INT",
 231         [VEC_INT6]      = "LEVEL 6 INT",
 232         [VEC_INT7]      = "LEVEL 7 INT",
 233         [VEC_SYS]       = "SYSCALL",
 234         [VEC_TRAP1]     = "TRAP #1",
 235         [VEC_TRAP2]     = "TRAP #2",
 236         [VEC_TRAP3]     = "TRAP #3",
 237         [VEC_TRAP4]     = "TRAP #4",
 238         [VEC_TRAP5]     = "TRAP #5",
 239         [VEC_TRAP6]     = "TRAP #6",
 240         [VEC_TRAP7]     = "TRAP #7",
 241         [VEC_TRAP8]     = "TRAP #8",
 242         [VEC_TRAP9]     = "TRAP #9",
 243         [VEC_TRAP10]    = "TRAP #10",
 244         [VEC_TRAP11]    = "TRAP #11",
 245         [VEC_TRAP12]    = "TRAP #12",
 246         [VEC_TRAP13]    = "TRAP #13",
 247         [VEC_TRAP14]    = "TRAP #14",
 248         [VEC_TRAP15]    = "TRAP #15",
 249         [VEC_FPBRUC]    = "FPCP BSUN",
 250         [VEC_FPIR]      = "FPCP INEXACT",
 251         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
 252         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
 253         [VEC_FPOE]      = "FPCP OPERAND ERROR",
 254         [VEC_FPOVER]    = "FPCP OVERFLOW",
 255         [VEC_FPNAN]     = "FPCP SNAN",
 256         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
 257         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 258         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 259         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 260         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 261         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 262         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 263         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 264         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 265 };
 266
 267 static const char *space_names[] = {
 268         [0]             = "Space 0",
 269         [USER_DATA]     = "User Data",
 270         [USER_PROGRAM]  = "User Program",
 271 #ifndef CONFIG_SUN3
 272         [3]             = "Space 3",
 273 #else
 274         [FC_CONTROL]    = "Control",
 275 #endif
 276         [4]             = "Space 4",
 277         [SUPER_DATA]    = "Super Data",
 278         [SUPER_PROGRAM] = "Super Program",
 279         [CPU_SPACE]     = "CPU"
 280 };
 281
 282 void die_if_kernel(char *,struct pt_regs *,int);
 283 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 284                              unsigned long error_code);
 285 int send_fault_sig(struct pt_regs *regs);
 286
 287 asmlinkage void trap_c(struct frame *fp);
 288
 289 #if defined (CONFIG_M68060)
 290 static inline void access_error060 (struct frame *fp)
 291 {
 292         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
 293
 294 #ifdef DEBUG
 295         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 296 #endif
 297
 298         if (fslw & MMU060_BPE) {
 299                 /* branch prediction error -> clear branch cache */
 300                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 301                                       "orl   #0x00400000,%/d0\n\t"
 302                                       "movec %/d0,%/cacr"
 303                                       : : : "d0" );
 304                 /* return if there's no other error */
 305                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 306                         return;
 307         }
 308
 309         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 310                 unsigned long errorcode;
 311                 unsigned long addr = fp->un.fmt4.effaddr;
 312
 313                 if (fslw & MMU060_MA)
 314                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 315
 316                 errorcode = 1;
 317                 if (fslw & MMU060_DESC_ERR) {
 318                         __flush_tlb040_one(addr);
 319                         errorcode = 0;
 320                 }
 321                 if (fslw & MMU060_W)
 322                         errorcode |= 2;
 323 #ifdef DEBUG
 324                 printk("errorcode = %d\n", errorcode );
 325 #endif
 326                 do_page_fault(&fp->ptregs, addr, errorcode);
 327         } else if (fslw & (MMU060_SEE)){
 328                 /* Software Emulation Error.
 329                  * fault during mem_read/mem_write in ifpsp060/os.S
 330                  */
 331                 send_fault_sig(&fp->ptregs);
 332         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 333                    send_fault_sig(&fp->ptregs) > 0) {
 334                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 335                 printk( "68060 access error, fslw=%lx\n", fslw );
 336                 trap_c( fp );
 337         }
 338 }
 339 #endif /* CONFIG_M68060 */
 340
 341 #if defined (CONFIG_M68040)
 342 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 343 {
 344         unsigned long mmusr;
 345         mm_segment_t old_fs = get_fs();
 346
 347         set_fs(MAKE_MM_SEG(wbs));
 348
 349         if (iswrite)
 350                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 351         else
 352                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 353
 354         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 355
 356         set_fs(old_fs);
 357
 358         return mmusr;
 359 }
 360
 361 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 362                                    unsigned long wbd)
 363 {
 364         int res = 0;
 365         mm_segment_t old_fs = get_fs();
 366
 367         /* set_fs can not be moved, otherwise put_user() may oops */
 368         set_fs(MAKE_MM_SEG(wbs));
 369
 370         switch (wbs & WBSIZ_040) {
 371         case BA_SIZE_BYTE:
 372                 res = put_user(wbd & 0xff, (char *)wba);
 373                 break;
 374         case BA_SIZE_WORD:
 375                 res = put_user(wbd & 0xffff, (short *)wba);
 376                 break;
 377         case BA_SIZE_LONG:
 378                 res = put_user(wbd, (int *)wba);
 379                 break;
 380         }
 381
 382         /* set_fs can not be moved, otherwise put_user() may oops */
 383         set_fs(old_fs);
 384
 385
 386 #ifdef DEBUG
 387         printk("do_040writeback1, res=%d\n",res);
 388 #endif
 389
 390         return res;
 391 }
 392
 393 /* after an exception in a writeback the stack frame corresponding
 394  * to that exception is discarded, set a few bits in the old frame
 395  * to simulate what it should look like
 396  */
 397 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 398 {
 399         fp->un.fmt7.faddr = wba;
 400         fp->un.fmt7.ssw = wbs & 0xff;
 401         if (wba != current->thread.faddr)
 402             fp->un.fmt7.ssw |= MA_040;
 403 }
 404
 405 static inline void do_040writebacks(struct frame *fp)
 406 {
 407         int res = 0;
 408 #if 0
 409         if (fp->un.fmt7.wb1s & WBV_040)
 410                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 411 #endif
 412
 413         if ((fp->un.fmt7.wb2s & WBV_040) &&
 414             !(fp->un.fmt7.wb2s & WBTT_040)) {
 415                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 416                                        fp->un.fmt7.wb2d);
 417                 if (res)
 418                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 419                 else
 420                         fp->un.fmt7.wb2s = 0;
 421         }
 422
 423         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 424         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 425                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 426                                        fp->un.fmt7.wb3d);
 427                 if (res)
 428                     {
 429                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 430
 431                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 432                         fp->un.fmt7.wb3s &= (~WBV_040);
 433                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 434                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 435                     }
 436                 else
 437                         fp->un.fmt7.wb3s = 0;
 438         }
 439
 440         if (res)
 441                 send_fault_sig(&fp->ptregs);
 442 }
 443
 444 /*
 445  * called from sigreturn(), must ensure userspace code didn't
 446  * manipulate exception frame to circumvent protection, then complete
 447  * pending writebacks
 448  * we just clear TM2 to turn it into an userspace access
 449  */
 450 asmlinkage void berr_040cleanup(struct frame *fp)
 451 {
 452         fp->un.fmt7.wb2s &= ~4;
 453         fp->un.fmt7.wb3s &= ~4;
 454
 455         do_040writebacks(fp);
 456 }
 457
 458 static inline void access_error040(struct frame *fp)
 459 {
 460         unsigned short ssw = fp->un.fmt7.ssw;
 461         unsigned long mmusr;
 462
 463 #ifdef DEBUG
 464         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 465         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 466                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 467         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 468                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 469                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 470 #endif
 471
 472         if (ssw & ATC_040) {
 473                 unsigned long addr = fp->un.fmt7.faddr;
 474                 unsigned long errorcode;
 475
 476                 /*
 477                  * The MMU status has to be determined AFTER the address
 478                  * has been corrected if there was a misaligned access (MA).
 479                  */
 480                 if (ssw & MA_040)
 481                         addr = (addr + 7) & -8;
 482
 483                 /* MMU error, get the MMUSR info for this access */
 484                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 485 #ifdef DEBUG
 486                 printk("mmusr = %lx\n", mmusr);
 487 #endif
 488                 errorcode = 1;
 489                 if (!(mmusr & MMU_R_040)) {
 490                         /* clear the invalid atc entry */
 491                         __flush_tlb040_one(addr);
 492                         errorcode = 0;
 493                 }
 494
 495                 /* despite what documentation seems to say, RMW
 496                  * accesses have always both the LK and RW bits set */
 497                 if (!(ssw & RW_040) || (ssw & LK_040))
 498                         errorcode |= 2;
 499
 500                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 501 #ifdef DEBUG
 502                         printk("do_page_fault() !=0 \n");
 503 #endif
 504                         if (user_mode(&fp->ptregs)){
 505                                 /* delay writebacks after signal delivery */
 506 #ifdef DEBUG
 507                                 printk(".. was usermode - return\n");
 508 #endif
 509                                 return;
 510                         }
 511                         /* disable writeback into user space from kernel
 512                          * (if do_page_fault didn't fix the mapping,
 513                          * the writeback won't do good)
 514                          */
 515 #ifdef DEBUG
 516                         printk(".. disabling wb2\n");
 517 #endif
 518                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 519                                 fp->un.fmt7.wb2s &= ~WBV_040;
 520                 }
 521         } else if (send_fault_sig(&fp->ptregs) > 0) {
 522                 printk("68040 access error, ssw=%x\n", ssw);
 523                 trap_c(fp);
 524         }
 525
 526         do_040writebacks(fp);
 527 }
 528 #endif /* CONFIG_M68040 */
 529
 530 #if defined(CONFIG_SUN3)
 531 #include <asm/sun3mmu.h>
 532
 533 extern int mmu_emu_handle_fault (unsigned long, int, int);
 534
 535 /* sun3 version of bus_error030 */
 536
 537 static inline void bus_error030 (struct frame *fp)
 538 {
 539         unsigned char buserr_type = sun3_get_buserr ();
 540         unsigned long addr, errorcode;
 541         unsigned short ssw = fp->un.fmtb.ssw;
 542         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 543
 544 #ifdef DEBUG
 545         if (ssw & (FC | FB))
 546                 printk ("Instruction fault at %#010lx\n",
 547                         ssw & FC ?
 548                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 549                         :
 550                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 551         if (ssw & DF)
 552                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 553                         ssw & RW ? "read" : "write",
 554                         fp->un.fmtb.daddr,
 555                         space_names[ssw & DFC], fp->ptregs.pc);
 556 #endif
 557
 558         /*
 559          * Check if this page should be demand-mapped. This needs to go before
 560          * the testing for a bad kernel-space access (demand-mapping applies
 561          * to kernel accesses too).
 562          */
 563
 564         if ((ssw & DF)
 565             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 566                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 567                         return;
 568         }
 569
 570         /* Check for kernel-space pagefault (BAD). */
 571         if (fp->ptregs.sr & PS_S) {
 572                 /* kernel fault must be a data fault to user space */
 573                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 574                      // try checking the kernel mappings before surrender
 575                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 576                           return;
 577                         /* instruction fault or kernel data fault! */
 578                         if (ssw & (FC | FB))
 579                                 printk ("Instruction fault at %#010lx\n",
 580                                         fp->ptregs.pc);
 581                         if (ssw & DF) {
 582                                 /* was this fault incurred testing bus mappings? */
 583                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 584                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 585                                         send_fault_sig(&fp->ptregs);
 586                                         return;
 587                                 }
 588
 589                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 590                                         ssw & RW ? "read" : "write",
 591                                         fp->un.fmtb.daddr,
 592                                         space_names[ssw & DFC], fp->ptregs.pc);
 593                         }
 594                         printk ("BAD KERNEL BUSERR\n");
 595
 596                         die_if_kernel("Oops", &fp->ptregs,0);
 597                         force_sig(SIGKILL, current);
 598                         return;
 599                 }
 600         } else {
 601                 /* user fault */
 602                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 603                         /* not an instruction fault or data fault! BAD */
 604                         panic ("USER BUSERR w/o instruction or data fault");
 605         }
 606
 607
 608         /* First handle the data fault, if any.  */
 609         if (ssw & DF) {
 610                 addr = fp->un.fmtb.daddr;
 611
 612 // errorcode bit 0:     0 -> no page            1 -> protection fault
 613 // errorcode bit 1:     0 -> read fault         1 -> write fault
 614
 615 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 616 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 617
 618                 if (buserr_type & SUN3_BUSERR_PROTERR)
 619                         errorcode = 0x01;
 620                 else if (buserr_type & SUN3_BUSERR_INVALID)
 621                         errorcode = 0x00;
 622                 else {
 623 #ifdef DEBUG
 624                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 625                         printk ("invalid %s access at %#lx from pc %#lx\n",
 626                                 !(ssw & RW) ? "write" : "read", addr,
 627                                 fp->ptregs.pc);
 628 #endif
 629                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 630                         force_sig (SIGBUS, current);
 631                         return;
 632                 }
 633
 634 //todo: wtf is RM bit? --m
 635                 if (!(ssw & RW) || ssw & RM)
 636                         errorcode |= 0x02;
 637
 638                 /* Handle page fault. */
 639                 do_page_fault (&fp->ptregs, addr, errorcode);
 640
 641                 /* Retry the data fault now. */
 642                 return;
 643         }
 644
 645         /* Now handle the instruction fault. */
 646
 647         /* Get the fault address. */
 648         if (fp->ptregs.format == 0xA)
 649                 addr = fp->ptregs.pc + 4;
 650         else
 651                 addr = fp->un.fmtb.baddr;
 652         if (ssw & FC)
 653                 addr -= 2;
 654
 655         if (buserr_type & SUN3_BUSERR_INVALID) {
 656                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 657                         do_page_fault (&fp->ptregs, addr, 0);
 658        } else {
 659 #ifdef DEBUG
 660                 printk ("protection fault on insn access (segv).\n");
 661 #endif
 662                 force_sig (SIGSEGV, current);
 663        }
 664 }
 665 #else
 666 #if defined(CPU_M68020_OR_M68030)
 667 static inline void bus_error030 (struct frame *fp)
 668 {
 669         volatile unsigned short temp;
 670         unsigned short mmusr;
 671         unsigned long addr, errorcode;
 672         unsigned short ssw = fp->un.fmtb.ssw;
 673 #ifdef DEBUG
 674         unsigned long desc;
 675
 676         printk ("pid = %x  ", current->pid);
 677         printk ("SSW=%#06x  ", ssw);
 678
 679         if (ssw & (FC | FB))
 680                 printk ("Instruction fault at %#010lx\n",
 681                         ssw & FC ?
 682                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 683                         :
 684                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 685         if (ssw & DF)
 686                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 687                         ssw & RW ? "read" : "write",
 688                         fp->un.fmtb.daddr,
 689                         space_names[ssw & DFC], fp->ptregs.pc);
 690 #endif
 691
 692         /* ++andreas: If a data fault and an instruction fault happen
 693            at the same time map in both pages.  */
 694
 695         /* First handle the data fault, if any.  */
 696         if (ssw & DF) {
 697                 addr = fp->un.fmtb.daddr;
 698
 699 #ifdef DEBUG
 700                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 701                               "pmove %%psr,%1@"
 702                               : "=a&" (desc)
 703                               : "a" (&temp), "a" (addr), "d" (ssw));
 704 #else
 705                 asm volatile ("ptestr %2,%1@,#7\n\t"
 706                               "pmove %%psr,%0@"
 707                               : : "a" (&temp), "a" (addr), "d" (ssw));
 708 #endif
 709                 mmusr = temp;
 710
 711 #ifdef DEBUG
 712                 printk("mmusr is %#x for addr %#lx in task %p\n",
 713                        mmusr, addr, current);
 714                 printk("descriptor address is %#lx, contents %#lx\n",
 715                        __va(desc), *(unsigned long *)__va(desc));
 716 #endif
 717
 718                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 719                 if (!(ssw & RW) || (ssw & RM))
 720                         errorcode |= 2;
 721
 722                 if (mmusr & (MMU_I | MMU_WP)) {
 723                         if (ssw & 4) {
 724                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 725                                        ssw & RW ? "read" : "write",
 726                                        fp->un.fmtb.daddr,
 727                                        space_names[ssw & DFC], fp->ptregs.pc);
 728                                 goto buserr;
 729                         }
 730                         /* Don't try to do anything further if an exception was
 731                            handled. */
 732                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 733                                 return;
 734                 } else if (!(mmusr & MMU_I)) {
 735                         /* probably a 020 cas fault */
 736                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 737                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 738                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 739                         printk("invalid %s access at %#lx from pc %#lx\n",
 740                                !(ssw & RW) ? "write" : "read", addr,
 741                                fp->ptregs.pc);
 742                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 743                         force_sig(SIGSEGV, current);
 744                         return;
 745                 } else {
 746 #if 0
 747                         static volatile long tlong;
 748 #endif
 749
 750                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 751                                !(ssw & RW) ? "write" : "read", addr,
 752                                fp->ptregs.pc, ssw);
 753                         asm volatile ("ptestr #1,%1@,#0\n\t"
 754                                       "pmove %%psr,%0@"
 755                                       : /* no outputs */
 756                                       : "a" (&temp), "a" (addr));
 757                         mmusr = temp;
 758
 759                         printk ("level 0 mmusr is %#x\n", mmusr);
 760 #if 0
 761                         asm volatile ("pmove %%tt0,%0@"
 762                                       : /* no outputs */
 763                                       : "a" (&tlong));
 764                         printk("tt0 is %#lx, ", tlong);
 765                         asm volatile ("pmove %%tt1,%0@"
 766                                       : /* no outputs */
 767                                       : "a" (&tlong));
 768                         printk("tt1 is %#lx\n", tlong);
 769 #endif
 770 #ifdef DEBUG
 771                         printk("Unknown SIGSEGV - 1\n");
 772 #endif
 773                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 774                         force_sig(SIGSEGV, current);
 775                         return;
 776                 }
 777
 778                 /* setup an ATC entry for the access about to be retried */
 779                 if (!(ssw & RW) || (ssw & RM))
 780                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 781                                       : "a" (addr), "d" (ssw));
 782                 else
 783                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 784                                       : "a" (addr), "d" (ssw));
 785         }
 786
 787         /* Now handle the instruction fault. */
 788
 789         if (!(ssw & (FC|FB)))
 790                 return;
 791
 792         if (fp->ptregs.sr & PS_S) {
 793                 printk("Instruction fault at %#010lx\n",
 794                         fp->ptregs.pc);
 795         buserr:
 796                 printk ("BAD KERNEL BUSERR\n");
 797                 die_if_kernel("Oops",&fp->ptregs,0);
 798                 force_sig(SIGKILL, current);
 799                 return;
 800         }
 801
 802         /* get the fault address */
 803         if (fp->ptregs.format == 10)
 804                 addr = fp->ptregs.pc + 4;
 805         else
 806                 addr = fp->un.fmtb.baddr;
 807         if (ssw & FC)
 808                 addr -= 2;
 809
 810         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 811                 /* Insn fault on same page as data fault.  But we
 812                    should still create the ATC entry.  */
 813                 goto create_atc_entry;
 814
 815 #ifdef DEBUG
 816         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 817                       "pmove %%psr,%1@"
 818                       : "=a&" (desc)
 819                       : "a" (&temp), "a" (addr));
 820 #else
 821         asm volatile ("ptestr #1,%1@,#7\n\t"
 822                       "pmove %%psr,%0@"
 823                       : : "a" (&temp), "a" (addr));
 824 #endif
 825         mmusr = temp;
 826
 827 #ifdef DEBUG
 828         printk ("mmusr is %#x for addr %#lx in task %p\n",
 829                 mmusr, addr, current);
 830         printk ("descriptor address is %#lx, contents %#lx\n",
 831                 __va(desc), *(unsigned long *)__va(desc));
 832 #endif
 833
 834         if (mmusr & MMU_I)
 835                 do_page_fault (&fp->ptregs, addr, 0);
 836         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 837                 printk ("invalid insn access at %#lx from pc %#lx\n",
 838                         addr, fp->ptregs.pc);
 839 #ifdef DEBUG
 840                 printk("Unknown SIGSEGV - 2\n");
 841 #endif
 842                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 843                 force_sig(SIGSEGV, current);
 844                 return;
 845         }
 846
 847 create_atc_entry:
 848         /* setup an ATC entry for the access about to be retried */
 849         asm volatile ("ploadr #2,%0@" : /* no outputs */
 850                       : "a" (addr));
 851 }
 852 #endif /* CPU_M68020_OR_M68030 */
 853 #endif /* !CONFIG_SUN3 */
 854
 855 asmlinkage void buserr_c(struct frame *fp)
 856 {
 857         /* Only set esp0 if coming from user mode */
 858         if (user_mode(&fp->ptregs))
 859                 current->thread.esp0 = (unsigned long) fp;
 860
 861 #ifdef DEBUG
 862         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 863 #endif
 864
 865         switch (fp->ptregs.format) {
 866 #if defined (CONFIG_M68060)
 867         case 4:                         /* 68060 access error */
 868           access_error060 (fp);
 869           break;
 870 #endif
 871 #if defined (CONFIG_M68040)
 872         case 0x7:                       /* 68040 access error */
 873           access_error040 (fp);
 874           break;
 875 #endif
 876 #if defined (CPU_M68020_OR_M68030)
 877         case 0xa:
 878         case 0xb:
 879           bus_error030 (fp);
 880           break;
 881 #endif
 882         default:
 883           die_if_kernel("bad frame format",&fp->ptregs,0);
 884 #ifdef DEBUG
 885           printk("Unknown SIGSEGV - 4\n");
 886 #endif
 887           force_sig(SIGSEGV, current);
 888         }
 889 }
 890
 891
 892 static int kstack_depth_to_print = 48;
 893
 894 void show_trace(unsigned long *stack)
 895 {
 896         unsigned long *endstack;
 897         unsigned long addr;
 898         int i;
 899
 900         printk("Call Trace:");
 901         addr = (unsigned long)stack + THREAD_SIZE - 1;
 902         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 903         i = 0;
 904         while (stack + 1 <= endstack) {
 905                 addr = *stack++;
 906                 /*
 907                  * If the address is either in the text segment of the
 908                  * kernel, or in the region which contains vmalloc'ed
 909                  * memory, it *may* be the address of a calling
 910                  * routine; if so, print it so that someone tracing
 911                  * down the cause of the crash will be able to figure
 912                  * out the call path that was taken.
 913                  */
 914                 if (__kernel_text_address(addr)) {
 915 #ifndef CONFIG_KALLSYMS
 916                         if (i % 5 == 0)
 917                                 printk("\n       ");
 918 #endif
 919                         printk(" [<%08lx>]", addr);
 920                         print_symbol(" %s\n", addr);
 921                         i++;
 922                 }
 923         }
 924         printk("\n");
 925 }
 926
 927 void show_registers(struct pt_regs *regs)
 928 {
 929         struct frame *fp = (struct frame *)regs;
 930         unsigned long addr;
 931         int i;
 932
 933         addr = (unsigned long)&fp->un;
 934         printk("Frame format=%X ", fp->ptregs.format);
 935         switch (fp->ptregs.format) {
 936         case 0x2:
 937             printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 938             addr += sizeof(fp->un.fmt2);
 939             break;
 940         case 0x3:
 941             printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 942             addr += sizeof(fp->un.fmt3);
 943             break;
 944         case 0x4:
 945             printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 946                     : "eff addr=%08lx pc=%08lx\n"),
 947                    fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 948             addr += sizeof(fp->un.fmt4);
 949             break;
 950         case 0x7:
 951             printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 952                    fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 953             printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 954                    fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 955             printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 956                    fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 957             printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 958                    fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 959             printk("push data: %08lx %08lx %08lx %08lx\n",
 960                    fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 961                    fp->un.fmt7.pd3);
 962             addr += sizeof(fp->un.fmt7);
 963             break;
 964         case 0x9:
 965             printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 966             addr += sizeof(fp->un.fmt9);
 967             break;
 968         case 0xa:
 969             printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 970                    fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 971                    fp->un.fmta.daddr, fp->un.fmta.dobuf);
 972             addr += sizeof(fp->un.fmta);
 973             break;
 974         case 0xb:
 975             printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 976                    fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 977                    fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 978             printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 979                    fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 980             addr += sizeof(fp->un.fmtb);
 981             break;
 982         default:
 983             printk("\n");
 984         }
 985         show_stack(NULL, (unsigned long *)addr);
 986
 987         printk("Code: ");
 988         for (i = 0; i < 10; i++)
 989                 printk("%04x ", 0xffff & ((short *) fp->ptregs.pc)[i]);
 990         printk ("\n");
 991 }
 992
 993 void show_stack(struct task_struct *task, unsigned long *stack)
 994 {
 995         unsigned long *endstack;
 996         int i;
 997
 998         if (!stack) {
 999                 if (task)
1000                         stack = (unsigned long *)task->thread.esp0;
1001                 else
1002                         stack = (unsigned long *)&stack;
1003         }
1004         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
1005
1006         printk("Stack from %08lx:", (unsigned long)stack);
1007         for (i = 0; i < kstack_depth_to_print; i++) {
1008                 if (stack + 1 > endstack)
1009                         break;
1010                 if (i % 8 == 0)
1011                         printk("\n       ");
1012                 printk(" %08lx", *stack++);
1013         }
1014         printk("\n");
1015         show_trace(stack);
1016 }
1017
1018 /*
1019  * The architecture-independent backtrace generator
1020  */
1021 void dump_stack(void)
1022 {
1023         unsigned long stack;
1024
1025         show_trace(&stack);
1026 }
1027
1028 EXPORT_SYMBOL(dump_stack);
1029
1030 void bad_super_trap (struct frame *fp)
1031 {
1032         console_verbose();
1033         if (fp->ptregs.vector < 4*sizeof(vec_names)/sizeof(vec_names[0]))
1034                 printk ("*** %s ***   FORMAT=%X\n",
1035                         vec_names[(fp->ptregs.vector) >> 2],
1036                         fp->ptregs.format);
1037         else
1038                 printk ("*** Exception %d ***   FORMAT=%X\n",
1039                         (fp->ptregs.vector) >> 2,
1040                         fp->ptregs.format);
1041         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1042                 unsigned short ssw = fp->un.fmtb.ssw;
1043
1044                 printk ("SSW=%#06x  ", ssw);
1045
1046                 if (ssw & RC)
1047                         printk ("Pipe stage C instruction fault at %#010lx\n",
1048                                 (fp->ptregs.format) == 0xA ?
1049                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1050                 if (ssw & RB)
1051                         printk ("Pipe stage B instruction fault at %#010lx\n",
1052                                 (fp->ptregs.format) == 0xA ?
1053                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1054                 if (ssw & DF)
1055                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1056                                 ssw & RW ? "read" : "write",
1057                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1058                                 fp->ptregs.pc);
1059         }
1060         printk ("Current process id is %d\n", current->pid);
1061         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1062 }
1063
1064 asmlinkage void trap_c(struct frame *fp)
1065 {
1066         int sig;
1067         siginfo_t info;
1068
1069         if (fp->ptregs.sr & PS_S) {
1070                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1071                         /* traced a trapping instruction */
1072                         current->ptrace |= PT_DTRACE;
1073                 } else
1074                         bad_super_trap(fp);
1075                 return;
1076         }
1077
1078         /* send the appropriate signal to the user program */
1079         switch ((fp->ptregs.vector) >> 2) {
1080             case VEC_ADDRERR:
1081                 info.si_code = BUS_ADRALN;
1082                 sig = SIGBUS;
1083                 break;
1084             case VEC_ILLEGAL:
1085             case VEC_LINE10:
1086             case VEC_LINE11:
1087                 info.si_code = ILL_ILLOPC;
1088                 sig = SIGILL;
1089                 break;
1090             case VEC_PRIV:
1091                 info.si_code = ILL_PRVOPC;
1092                 sig = SIGILL;
1093                 break;
1094             case VEC_COPROC:
1095                 info.si_code = ILL_COPROC;
1096                 sig = SIGILL;
1097                 break;
1098             case VEC_TRAP1:
1099             case VEC_TRAP2:
1100             case VEC_TRAP3:
1101             case VEC_TRAP4:
1102             case VEC_TRAP5:
1103             case VEC_TRAP6:
1104             case VEC_TRAP7:
1105             case VEC_TRAP8:
1106             case VEC_TRAP9:
1107             case VEC_TRAP10:
1108             case VEC_TRAP11:
1109             case VEC_TRAP12:
1110             case VEC_TRAP13:
1111             case VEC_TRAP14:
1112                 info.si_code = ILL_ILLTRP;
1113                 sig = SIGILL;
1114                 break;
1115             case VEC_FPBRUC:
1116             case VEC_FPOE:
1117             case VEC_FPNAN:
1118                 info.si_code = FPE_FLTINV;
1119                 sig = SIGFPE;
1120                 break;
1121             case VEC_FPIR:
1122                 info.si_code = FPE_FLTRES;
1123                 sig = SIGFPE;
1124                 break;
1125             case VEC_FPDIVZ:
1126                 info.si_code = FPE_FLTDIV;
1127                 sig = SIGFPE;
1128                 break;
1129             case VEC_FPUNDER:
1130                 info.si_code = FPE_FLTUND;
1131                 sig = SIGFPE;
1132                 break;
1133             case VEC_FPOVER:
1134                 info.si_code = FPE_FLTOVF;
1135                 sig = SIGFPE;
1136                 break;
1137             case VEC_ZERODIV:
1138                 info.si_code = FPE_INTDIV;
1139                 sig = SIGFPE;
1140                 break;
1141             case VEC_CHK:
1142             case VEC_TRAP:
1143                 info.si_code = FPE_INTOVF;
1144                 sig = SIGFPE;
1145                 break;
1146             case VEC_TRACE:             /* ptrace single step */
1147                 info.si_code = TRAP_TRACE;
1148                 sig = SIGTRAP;
1149                 break;
1150             case VEC_TRAP15:            /* breakpoint */
1151                 info.si_code = TRAP_BRKPT;
1152                 sig = SIGTRAP;
1153                 break;
1154             default:
1155                 info.si_code = ILL_ILLOPC;
1156                 sig = SIGILL;
1157                 break;
1158         }
1159         info.si_signo = sig;
1160         info.si_errno = 0;
1161         switch (fp->ptregs.format) {
1162             default:
1163                 info.si_addr = (void *) fp->ptregs.pc;
1164                 break;
1165             case 2:
1166                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1167                 break;
1168             case 7:
1169                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1170                 break;
1171             case 9:
1172                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1173                 break;
1174             case 10:
1175                 info.si_addr = (void *) fp->un.fmta.daddr;
1176                 break;
1177             case 11:
1178                 info.si_addr = (void *) fp->un.fmtb.daddr;
1179                 break;
1180         }
1181         force_sig_info (sig, &info, current);
1182 }
1183
1184 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1185 {
1186         if (!(fp->sr & PS_S))
1187                 return;
1188
1189         console_verbose();
1190         printk("%s: %08x\n",str,nr);
1191         print_modules();
1192         printk("PC: [<%08lx>]",fp->pc);
1193         print_symbol(" %s\n", fp->pc);
1194         printk("\nSR: %04x  SP: %p  a2: %08lx\n",
1195                fp->sr, fp, fp->a2);
1196         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
1197                fp->d0, fp->d1, fp->d2, fp->d3);
1198         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
1199                fp->d4, fp->d5, fp->a0, fp->a1);
1200
1201         printk("Process %s (pid: %d, stackpage=%08lx)\n",
1202                 current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
1203         show_stack(NULL, (unsigned long *)fp);
1204         do_exit(SIGSEGV);
1205 }
1206
1207 /*
1208  * This function is called if an error occur while accessing
1209  * user-space from the fpsp040 code.
1210  */
1211 asmlinkage void fpsp040_die(void)
1212 {
1213         do_exit(SIGSEGV);
1214 }
1215
1216 #ifdef CONFIG_M68KFPU_EMU
1217 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1218 {
1219         siginfo_t info;
1220
1221         info.si_signo = signal;
1222         info.si_errno = 0;
1223         info.si_code = code;
1224         info.si_addr = addr;
1225         force_sig_info(signal, &info, current);
1226 }
1227 #endif