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/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_vec(void) asm ("_060_fpsp_snan");
 173                 asmlinkage void operr_vec(void) asm ("_060_fpsp_operr");
 174                 asmlinkage void ovfl_vec(void) asm ("_060_fpsp_ovfl");
 175                 asmlinkage void unfl_vec(void) asm ("_060_fpsp_unfl");
 176                 asmlinkage void dz_vec(void) asm ("_060_fpsp_dz");
 177                 asmlinkage void inex_vec(void) asm ("_060_fpsp_inex");
 178                 asmlinkage void fline_vec(void) asm ("_060_fpsp_fline");
 179                 asmlinkage void unsupp_vec(void) asm ("_060_fpsp_unsupp");
 180                 asmlinkage void effadd_vec(void) asm ("_060_fpsp_effadd");
 181
 182                 vectors[VEC_FPNAN] = snan_vec;
 183                 vectors[VEC_FPOE] = operr_vec;
 184                 vectors[VEC_FPOVER] = ovfl_vec;
 185                 vectors[VEC_FPUNDER] = unfl_vec;
 186                 vectors[VEC_FPDIVZ] = dz_vec;
 187                 vectors[VEC_FPIR] = inex_vec;
 188                 vectors[VEC_LINE11] = fline_vec;
 189                 vectors[VEC_FPUNSUP] = unsupp_vec;
 190                 vectors[VEC_UNIMPEA] = effadd_vec;
 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 {
 333                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 334                 printk( "68060 access error, fslw=%lx\n", fslw );
 335                 trap_c( fp );
 336         }
 337 }
 338 #endif /* CONFIG_M68060 */
 339
 340 #if defined (CONFIG_M68040)
 341 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 342 {
 343         unsigned long mmusr;
 344         mm_segment_t old_fs = get_fs();
 345
 346         set_fs(MAKE_MM_SEG(wbs));
 347
 348         if (iswrite)
 349                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 350         else
 351                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 352
 353         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 354
 355         set_fs(old_fs);
 356
 357         return mmusr;
 358 }
 359
 360 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 361                                    unsigned long wbd)
 362 {
 363         int res = 0;
 364         mm_segment_t old_fs = get_fs();
 365
 366         /* set_fs can not be moved, otherwise put_user() may oops */
 367         set_fs(MAKE_MM_SEG(wbs));
 368
 369         switch (wbs & WBSIZ_040) {
 370         case BA_SIZE_BYTE:
 371                 res = put_user(wbd & 0xff, (char *)wba);
 372                 break;
 373         case BA_SIZE_WORD:
 374                 res = put_user(wbd & 0xffff, (short *)wba);
 375                 break;
 376         case BA_SIZE_LONG:
 377                 res = put_user(wbd, (int *)wba);
 378                 break;
 379         }
 380
 381         /* set_fs can not be moved, otherwise put_user() may oops */
 382         set_fs(old_fs);
 383
 384
 385 #ifdef DEBUG
 386         printk("do_040writeback1, res=%d\n",res);
 387 #endif
 388
 389         return res;
 390 }
 391
 392 /* after an exception in a writeback the stack frame corresponding
 393  * to that exception is discarded, set a few bits in the old frame
 394  * to simulate what it should look like
 395  */
 396 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 397 {
 398         fp->un.fmt7.faddr = wba;
 399         fp->un.fmt7.ssw = wbs & 0xff;
 400         if (wba != current->thread.faddr)
 401             fp->un.fmt7.ssw |= MA_040;
 402 }
 403
 404 static inline void do_040writebacks(struct frame *fp)
 405 {
 406         int res = 0;
 407 #if 0
 408         if (fp->un.fmt7.wb1s & WBV_040)
 409                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 410 #endif
 411
 412         if ((fp->un.fmt7.wb2s & WBV_040) &&
 413             !(fp->un.fmt7.wb2s & WBTT_040)) {
 414                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 415                                        fp->un.fmt7.wb2d);
 416                 if (res)
 417                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 418                 else
 419                         fp->un.fmt7.wb2s = 0;
 420         }
 421
 422         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 423         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 424                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 425                                        fp->un.fmt7.wb3d);
 426                 if (res)
 427                     {
 428                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 429
 430                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 431                         fp->un.fmt7.wb3s &= (~WBV_040);
 432                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 433                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 434                     }
 435                 else
 436                         fp->un.fmt7.wb3s = 0;
 437         }
 438
 439         if (res)
 440                 send_fault_sig(&fp->ptregs);
 441 }
 442
 443 /*
 444  * called from sigreturn(), must ensure userspace code didn't
 445  * manipulate exception frame to circumvent protection, then complete
 446  * pending writebacks
 447  * we just clear TM2 to turn it into an userspace access
 448  */
 449 asmlinkage void berr_040cleanup(struct frame *fp)
 450 {
 451         fp->un.fmt7.wb2s &= ~4;
 452         fp->un.fmt7.wb3s &= ~4;
 453
 454         do_040writebacks(fp);
 455 }
 456
 457 static inline void access_error040(struct frame *fp)
 458 {
 459         unsigned short ssw = fp->un.fmt7.ssw;
 460         unsigned long mmusr;
 461
 462 #ifdef DEBUG
 463         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 464         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 465                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 466         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 467                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 468                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 469 #endif
 470
 471         if (ssw & ATC_040) {
 472                 unsigned long addr = fp->un.fmt7.faddr;
 473                 unsigned long errorcode;
 474
 475                 /*
 476                  * The MMU status has to be determined AFTER the address
 477                  * has been corrected if there was a misaligned access (MA).
 478                  */
 479                 if (ssw & MA_040)
 480                         addr = (addr + 7) & -8;
 481
 482                 /* MMU error, get the MMUSR info for this access */
 483                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 484 #ifdef DEBUG
 485                 printk("mmusr = %lx\n", mmusr);
 486 #endif
 487                 errorcode = 1;
 488                 if (!(mmusr & MMU_R_040)) {
 489                         /* clear the invalid atc entry */
 490                         __flush_tlb040_one(addr);
 491                         errorcode = 0;
 492                 }
 493
 494                 /* despite what documentation seems to say, RMW
 495                  * accesses have always both the LK and RW bits set */
 496                 if (!(ssw & RW_040) || (ssw & LK_040))
 497                         errorcode |= 2;
 498
 499                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 500 #ifdef DEBUG
 501                         printk("do_page_fault() !=0 \n");
 502 #endif
 503                         if (user_mode(&fp->ptregs)){
 504                                 /* delay writebacks after signal delivery */
 505 #ifdef DEBUG
 506                                 printk(".. was usermode - return\n");
 507 #endif
 508                                 return;
 509                         }
 510                         /* disable writeback into user space from kernel
 511                          * (if do_page_fault didn't fix the mapping,
 512                          * the writeback won't do good)
 513                          */
 514 #ifdef DEBUG
 515                         printk(".. disabling wb2\n");
 516 #endif
 517                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 518                                 fp->un.fmt7.wb2s &= ~WBV_040;
 519                 }
 520         } else {
 521                 printk("68040 access error, ssw=%x\n", ssw);
 522                 trap_c(fp);
 523         }
 524
 525         do_040writebacks(fp);
 526 }
 527 #endif /* CONFIG_M68040 */
 528
 529 #if defined(CONFIG_SUN3)
 530 #include <asm/sun3mmu.h>
 531
 532 extern int mmu_emu_handle_fault (unsigned long, int, int);
 533
 534 /* sun3 version of bus_error030 */
 535
 536 static inline void bus_error030 (struct frame *fp)
 537 {
 538         unsigned char buserr_type = sun3_get_buserr ();
 539         unsigned long addr, errorcode;
 540         unsigned short ssw = fp->un.fmtb.ssw;
 541         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 542
 543 #if DEBUG
 544         if (ssw & (FC | FB))
 545                 printk ("Instruction fault at %#010lx\n",
 546                         ssw & FC ?
 547                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 548                         :
 549                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 550         if (ssw & DF)
 551                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 552                         ssw & RW ? "read" : "write",
 553                         fp->un.fmtb.daddr,
 554                         space_names[ssw & DFC], fp->ptregs.pc);
 555 #endif
 556
 557         /*
 558          * Check if this page should be demand-mapped. This needs to go before
 559          * the testing for a bad kernel-space access (demand-mapping applies
 560          * to kernel accesses too).
 561          */
 562
 563         if ((ssw & DF)
 564             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 565                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 566                         return;
 567         }
 568
 569         /* Check for kernel-space pagefault (BAD). */
 570         if (fp->ptregs.sr & PS_S) {
 571                 /* kernel fault must be a data fault to user space */
 572                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 573                      // try checking the kernel mappings before surrender
 574                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 575                           return;
 576                         /* instruction fault or kernel data fault! */
 577                         if (ssw & (FC | FB))
 578                                 printk ("Instruction fault at %#010lx\n",
 579                                         fp->ptregs.pc);
 580                         if (ssw & DF) {
 581                                 /* was this fault incurred testing bus mappings? */
 582                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 583                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 584                                         send_fault_sig(&fp->ptregs);
 585                                         return;
 586                                 }
 587
 588                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 589                                         ssw & RW ? "read" : "write",
 590                                         fp->un.fmtb.daddr,
 591                                         space_names[ssw & DFC], fp->ptregs.pc);
 592                         }
 593                         printk ("BAD KERNEL BUSERR\n");
 594
 595                         die_if_kernel("Oops", &fp->ptregs,0);
 596                         force_sig(SIGKILL, current);
 597                         return;
 598                 }
 599         } else {
 600                 /* user fault */
 601                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 602                         /* not an instruction fault or data fault! BAD */
 603                         panic ("USER BUSERR w/o instruction or data fault");
 604         }
 605
 606
 607         /* First handle the data fault, if any.  */
 608         if (ssw & DF) {
 609                 addr = fp->un.fmtb.daddr;
 610
 611 // errorcode bit 0:     0 -> no page            1 -> protection fault
 612 // errorcode bit 1:     0 -> read fault         1 -> write fault
 613
 614 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 615 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 616
 617                 if (buserr_type & SUN3_BUSERR_PROTERR)
 618                         errorcode = 0x01;
 619                 else if (buserr_type & SUN3_BUSERR_INVALID)
 620                         errorcode = 0x00;
 621                 else {
 622 #ifdef DEBUG
 623                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 624                         printk ("invalid %s access at %#lx from pc %#lx\n",
 625                                 !(ssw & RW) ? "write" : "read", addr,
 626                                 fp->ptregs.pc);
 627 #endif
 628                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 629                         force_sig (SIGBUS, current);
 630                         return;
 631                 }
 632
 633 //todo: wtf is RM bit? --m
 634                 if (!(ssw & RW) || ssw & RM)
 635                         errorcode |= 0x02;
 636
 637                 /* Handle page fault. */
 638                 do_page_fault (&fp->ptregs, addr, errorcode);
 639
 640                 /* Retry the data fault now. */
 641                 return;
 642         }
 643
 644         /* Now handle the instruction fault. */
 645
 646         /* Get the fault address. */
 647         if (fp->ptregs.format == 0xA)
 648                 addr = fp->ptregs.pc + 4;
 649         else
 650                 addr = fp->un.fmtb.baddr;
 651         if (ssw & FC)
 652                 addr -= 2;
 653
 654         if (buserr_type & SUN3_BUSERR_INVALID) {
 655                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 656                         do_page_fault (&fp->ptregs, addr, 0);
 657        } else {
 658 #ifdef DEBUG
 659                 printk ("protection fault on insn access (segv).\n");
 660 #endif
 661                 force_sig (SIGSEGV, current);
 662        }
 663 }
 664 #else
 665 #if defined(CPU_M68020_OR_M68030)
 666 static inline void bus_error030 (struct frame *fp)
 667 {
 668         volatile unsigned short temp;
 669         unsigned short mmusr;
 670         unsigned long addr, errorcode;
 671         unsigned short ssw = fp->un.fmtb.ssw;
 672 #if DEBUG
 673         unsigned long desc;
 674
 675         printk ("pid = %x  ", current->pid);
 676         printk ("SSW=%#06x  ", ssw);
 677
 678         if (ssw & (FC | FB))
 679                 printk ("Instruction fault at %#010lx\n",
 680                         ssw & FC ?
 681                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 682                         :
 683                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 684         if (ssw & DF)
 685                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 686                         ssw & RW ? "read" : "write",
 687                         fp->un.fmtb.daddr,
 688                         space_names[ssw & DFC], fp->ptregs.pc);
 689 #endif
 690
 691         /* ++andreas: If a data fault and an instruction fault happen
 692            at the same time map in both pages.  */
 693
 694         /* First handle the data fault, if any.  */
 695         if (ssw & DF) {
 696                 addr = fp->un.fmtb.daddr;
 697
 698 #if DEBUG
 699                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 700                               "pmove %%psr,%1@"
 701                               : "=a&" (desc)
 702                               : "a" (&temp), "a" (addr), "d" (ssw));
 703 #else
 704                 asm volatile ("ptestr %2,%1@,#7\n\t"
 705                               "pmove %%psr,%0@"
 706                               : : "a" (&temp), "a" (addr), "d" (ssw));
 707 #endif
 708                 mmusr = temp;
 709
 710 #if DEBUG
 711                 printk("mmusr is %#x for addr %#lx in task %p\n",
 712                        mmusr, addr, current);
 713                 printk("descriptor address is %#lx, contents %#lx\n",
 714                        __va(desc), *(unsigned long *)__va(desc));
 715 #endif
 716
 717                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 718                 if (!(ssw & RW) || (ssw & RM))
 719                         errorcode |= 2;
 720
 721                 if (mmusr & (MMU_I | MMU_WP)) {
 722                         if (ssw & 4) {
 723                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 724                                        ssw & RW ? "read" : "write",
 725                                        fp->un.fmtb.daddr,
 726                                        space_names[ssw & DFC], fp->ptregs.pc);
 727                                 goto buserr;
 728                         }
 729                         /* Don't try to do anything further if an exception was
 730                            handled. */
 731                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 732                                 return;
 733                 } else if (!(mmusr & MMU_I)) {
 734                         /* probably a 020 cas fault */
 735                         if (!(ssw & RM))
 736                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 737                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 738                         printk("invalid %s access at %#lx from pc %#lx\n",
 739                                !(ssw & RW) ? "write" : "read", addr,
 740                                fp->ptregs.pc);
 741                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 742                         force_sig(SIGSEGV, current);
 743                         return;
 744                 } else {
 745 #if 0
 746                         static volatile long tlong;
 747 #endif
 748
 749                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 750                                !(ssw & RW) ? "write" : "read", addr,
 751                                fp->ptregs.pc, ssw);
 752                         asm volatile ("ptestr #1,%1@,#0\n\t"
 753                                       "pmove %%psr,%0@"
 754                                       : /* no outputs */
 755                                       : "a" (&temp), "a" (addr));
 756                         mmusr = temp;
 757
 758                         printk ("level 0 mmusr is %#x\n", mmusr);
 759 #if 0
 760                         asm volatile ("pmove %%tt0,%0@"
 761                                       : /* no outputs */
 762                                       : "a" (&tlong));
 763                         printk("tt0 is %#lx, ", tlong);
 764                         asm volatile ("pmove %%tt1,%0@"
 765                                       : /* no outputs */
 766                                       : "a" (&tlong));
 767                         printk("tt1 is %#lx\n", tlong);
 768 #endif
 769 #if DEBUG
 770                         printk("Unknown SIGSEGV - 1\n");
 771 #endif
 772                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 773                         force_sig(SIGSEGV, current);
 774                         return;
 775                 }
 776
 777                 /* setup an ATC entry for the access about to be retried */
 778                 if (!(ssw & RW) || (ssw & RM))
 779                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 780                                       : "a" (addr), "d" (ssw));
 781                 else
 782                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 783                                       : "a" (addr), "d" (ssw));
 784         }
 785
 786         /* Now handle the instruction fault. */
 787
 788         if (!(ssw & (FC|FB)))
 789                 return;
 790
 791         if (fp->ptregs.sr & PS_S) {
 792                 printk("Instruction fault at %#010lx\n",
 793                         fp->ptregs.pc);
 794         buserr:
 795                 printk ("BAD KERNEL BUSERR\n");
 796                 die_if_kernel("Oops",&fp->ptregs,0);
 797                 force_sig(SIGKILL, current);
 798                 return;
 799         }
 800
 801         /* get the fault address */
 802         if (fp->ptregs.format == 10)
 803                 addr = fp->ptregs.pc + 4;
 804         else
 805                 addr = fp->un.fmtb.baddr;
 806         if (ssw & FC)
 807                 addr -= 2;
 808
 809         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 810                 /* Insn fault on same page as data fault.  But we
 811                    should still create the ATC entry.  */
 812                 goto create_atc_entry;
 813
 814 #if DEBUG
 815         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 816                       "pmove %%psr,%1@"
 817                       : "=a&" (desc)
 818                       : "a" (&temp), "a" (addr));
 819 #else
 820         asm volatile ("ptestr #1,%1@,#7\n\t"
 821                       "pmove %%psr,%0@"
 822                       : : "a" (&temp), "a" (addr));
 823 #endif
 824         mmusr = temp;
 825
 826 #ifdef DEBUG
 827         printk ("mmusr is %#x for addr %#lx in task %p\n",
 828                 mmusr, addr, current);
 829         printk ("descriptor address is %#lx, contents %#lx\n",
 830                 __va(desc), *(unsigned long *)__va(desc));
 831 #endif
 832
 833         if (mmusr & MMU_I)
 834                 do_page_fault (&fp->ptregs, addr, 0);
 835         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 836                 printk ("invalid insn access at %#lx from pc %#lx\n",
 837                         addr, fp->ptregs.pc);
 838 #if DEBUG
 839                 printk("Unknown SIGSEGV - 2\n");
 840 #endif
 841                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 842                 force_sig(SIGSEGV, current);
 843                 return;
 844         }
 845
 846 create_atc_entry:
 847         /* setup an ATC entry for the access about to be retried */
 848         asm volatile ("ploadr #2,%0@" : /* no outputs */
 849                       : "a" (addr));
 850 }
 851 #endif /* CPU_M68020_OR_M68030 */
 852 #endif /* !CONFIG_SUN3 */
 853
 854 asmlinkage void buserr_c(struct frame *fp)
 855 {
 856         /* Only set esp0 if coming from user mode */
 857         if (user_mode(&fp->ptregs))
 858                 current->thread.esp0 = (unsigned long) fp;
 859
 860 #if DEBUG
 861         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 862 #endif
 863
 864         switch (fp->ptregs.format) {
 865 #if defined (CONFIG_M68060)
 866         case 4:                         /* 68060 access error */
 867           access_error060 (fp);
 868           break;
 869 #endif
 870 #if defined (CONFIG_M68040)
 871         case 0x7:                       /* 68040 access error */
 872           access_error040 (fp);
 873           break;
 874 #endif
 875 #if defined (CPU_M68020_OR_M68030)
 876         case 0xa:
 877         case 0xb:
 878           bus_error030 (fp);
 879           break;
 880 #endif
 881         default:
 882           die_if_kernel("bad frame format",&fp->ptregs,0);
 883 #if DEBUG
 884           printk("Unknown SIGSEGV - 4\n");
 885 #endif
 886           force_sig(SIGSEGV, current);
 887         }
 888 }
 889
 890
 891 static int kstack_depth_to_print = 48;
 892
 893 void show_trace(unsigned long *stack)
 894 {
 895         unsigned long *endstack;
 896         unsigned long addr;
 897         int i;
 898
 899         printk("Call Trace:");
 900         addr = (unsigned long)stack + THREAD_SIZE - 1;
 901         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 902         i = 0;
 903         while (stack + 1 <= endstack) {
 904                 addr = *stack++;
 905                 /*
 906                  * If the address is either in the text segment of the
 907                  * kernel, or in the region which contains vmalloc'ed
 908                  * memory, it *may* be the address of a calling
 909                  * routine; if so, print it so that someone tracing
 910                  * down the cause of the crash will be able to figure
 911                  * out the call path that was taken.
 912                  */
 913                 if (kernel_text_address(addr)) {
 914 #ifndef CONFIG_KALLSYMS
 915                         if (i % 5 == 0)
 916                                 printk("\n       ");
 917 #endif
 918                         printk(" [<%08lx>]", addr);
 919                         print_symbol(" %s\n", addr);
 920                         i++;
 921                 }
 922         }
 923         printk("\n");
 924 }
 925
 926 void show_registers(struct pt_regs *regs)
 927 {
 928         struct frame *fp = (struct frame *)regs;
 929         unsigned long addr;
 930         int i;
 931
 932         addr = (unsigned long)&fp->un;
 933         printk("Frame format=%X ", fp->ptregs.format);
 934         switch (fp->ptregs.format) {
 935         case 0x2:
 936             printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 937             addr += sizeof(fp->un.fmt2);
 938             break;
 939         case 0x3:
 940             printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 941             addr += sizeof(fp->un.fmt3);
 942             break;
 943         case 0x4:
 944             printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 945                     : "eff addr=%08lx pc=%08lx\n"),
 946                    fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 947             addr += sizeof(fp->un.fmt4);
 948             break;
 949         case 0x7:
 950             printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 951                    fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 952             printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 953                    fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 954             printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 955                    fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 956             printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 957                    fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 958             printk("push data: %08lx %08lx %08lx %08lx\n",
 959                    fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 960                    fp->un.fmt7.pd3);
 961             addr += sizeof(fp->un.fmt7);
 962             break;
 963         case 0x9:
 964             printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 965             addr += sizeof(fp->un.fmt9);
 966             break;
 967         case 0xa:
 968             printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 969                    fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 970                    fp->un.fmta.daddr, fp->un.fmta.dobuf);
 971             addr += sizeof(fp->un.fmta);
 972             break;
 973         case 0xb:
 974             printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 975                    fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 976                    fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 977             printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 978                    fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 979             addr += sizeof(fp->un.fmtb);
 980             break;
 981         default:
 982             printk("\n");
 983         }
 984         show_stack(NULL, (unsigned long *)addr);
 985
 986         printk("Code: ");
 987         for (i = 0; i < 10; i++)
 988                 printk("%04x ", 0xffff & ((short *) fp->ptregs.pc)[i]);
 989         printk ("\n");
 990 }
 991
 992 extern void show_stack(struct task_struct *task, unsigned long *stack)
 993 {
 994         unsigned long *endstack;
 995         int i;
 996
 997         if (!stack) {
 998                 if (task)
 999                         stack = (unsigned long *)task->thread.esp0;
1000                 else
1001                         stack = (unsigned long *)&stack;
1002         }
1003         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
1004
1005         printk("Stack from %08lx:", (unsigned long)stack);
1006         for (i = 0; i < kstack_depth_to_print; i++) {
1007                 if (stack + 1 > endstack)
1008                         break;
1009                 if (i % 8 == 0)
1010                         printk("\n       ");
1011                 printk(" %08lx", *stack++);
1012         }
1013         printk("\n");
1014         show_trace(stack);
1015 }
1016
1017 /*
1018  * The architecture-independent backtrace generator
1019  */
1020 void dump_stack(void)
1021 {
1022         unsigned long stack;
1023
1024         show_trace(&stack);
1025 }
1026
1027 EXPORT_SYMBOL(dump_stack);
1028
1029 void bad_super_trap (struct frame *fp)
1030 {
1031         console_verbose();
1032         if (fp->ptregs.vector < 4*sizeof(vec_names)/sizeof(vec_names[0]))
1033                 printk ("*** %s ***   FORMAT=%X\n",
1034                         vec_names[(fp->ptregs.vector) >> 2],
1035                         fp->ptregs.format);
1036         else
1037                 printk ("*** Exception %d ***   FORMAT=%X\n",
1038                         (fp->ptregs.vector) >> 2,
1039                         fp->ptregs.format);
1040         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1041                 unsigned short ssw = fp->un.fmtb.ssw;
1042
1043                 printk ("SSW=%#06x  ", ssw);
1044
1045                 if (ssw & RC)
1046                         printk ("Pipe stage C instruction fault at %#010lx\n",
1047                                 (fp->ptregs.format) == 0xA ?
1048                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1049                 if (ssw & RB)
1050                         printk ("Pipe stage B instruction fault at %#010lx\n",
1051                                 (fp->ptregs.format) == 0xA ?
1052                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1053                 if (ssw & DF)
1054                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1055                                 ssw & RW ? "read" : "write",
1056                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1057                                 fp->ptregs.pc);
1058         }
1059         printk ("Current process id is %d\n", current->pid);
1060         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1061 }
1062
1063 asmlinkage void trap_c(struct frame *fp)
1064 {
1065         int sig;
1066         siginfo_t info;
1067
1068         if (fp->ptregs.sr & PS_S) {
1069                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1070                         /* traced a trapping instruction */
1071                         current->ptrace |= PT_DTRACE;
1072                 } else
1073                         bad_super_trap(fp);
1074                 return;
1075         }
1076
1077         /* send the appropriate signal to the user program */
1078         switch ((fp->ptregs.vector) >> 2) {
1079             case VEC_ADDRERR:
1080                 info.si_code = BUS_ADRALN;
1081                 sig = SIGBUS;
1082                 break;
1083             case VEC_ILLEGAL:
1084             case VEC_LINE10:
1085             case VEC_LINE11:
1086                 info.si_code = ILL_ILLOPC;
1087                 sig = SIGILL;
1088                 break;
1089             case VEC_PRIV:
1090                 info.si_code = ILL_PRVOPC;
1091                 sig = SIGILL;
1092                 break;
1093             case VEC_COPROC:
1094                 info.si_code = ILL_COPROC;
1095                 sig = SIGILL;
1096                 break;
1097             case VEC_TRAP1:
1098             case VEC_TRAP2:
1099             case VEC_TRAP3:
1100             case VEC_TRAP4:
1101             case VEC_TRAP5:
1102             case VEC_TRAP6:
1103             case VEC_TRAP7:
1104             case VEC_TRAP8:
1105             case VEC_TRAP9:
1106             case VEC_TRAP10:
1107             case VEC_TRAP11:
1108             case VEC_TRAP12:
1109             case VEC_TRAP13:
1110             case VEC_TRAP14:
1111                 info.si_code = ILL_ILLTRP;
1112                 sig = SIGILL;
1113                 break;
1114             case VEC_FPBRUC:
1115             case VEC_FPOE:
1116             case VEC_FPNAN:
1117                 info.si_code = FPE_FLTINV;
1118                 sig = SIGFPE;
1119                 break;
1120             case VEC_FPIR:
1121                 info.si_code = FPE_FLTRES;
1122                 sig = SIGFPE;
1123                 break;
1124             case VEC_FPDIVZ:
1125                 info.si_code = FPE_FLTDIV;
1126                 sig = SIGFPE;
1127                 break;
1128             case VEC_FPUNDER:
1129                 info.si_code = FPE_FLTUND;
1130                 sig = SIGFPE;
1131                 break;
1132             case VEC_FPOVER:
1133                 info.si_code = FPE_FLTOVF;
1134                 sig = SIGFPE;
1135                 break;
1136             case VEC_ZERODIV:
1137                 info.si_code = FPE_INTDIV;
1138                 sig = SIGFPE;
1139                 break;
1140             case VEC_CHK:
1141             case VEC_TRAP:
1142                 info.si_code = FPE_INTOVF;
1143                 sig = SIGFPE;
1144                 break;
1145             case VEC_TRACE:             /* ptrace single step */
1146                 info.si_code = TRAP_TRACE;
1147                 sig = SIGTRAP;
1148                 break;
1149             case VEC_TRAP15:            /* breakpoint */
1150                 info.si_code = TRAP_BRKPT;
1151                 sig = SIGTRAP;
1152                 break;
1153             default:
1154                 info.si_code = ILL_ILLOPC;
1155                 sig = SIGILL;
1156                 break;
1157         }
1158         info.si_signo = sig;
1159         info.si_errno = 0;
1160         switch (fp->ptregs.format) {
1161             default:
1162                 info.si_addr = (void *) fp->ptregs.pc;
1163                 break;
1164             case 2:
1165                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1166                 break;
1167             case 7:
1168                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1169                 break;
1170             case 9:
1171                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1172                 break;
1173             case 10:
1174                 info.si_addr = (void *) fp->un.fmta.daddr;
1175                 break;
1176             case 11:
1177                 info.si_addr = (void *) fp->un.fmtb.daddr;
1178                 break;
1179         }
1180         force_sig_info (sig, &info, current);
1181 }
1182
1183 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1184 {
1185         if (!(fp->sr & PS_S))
1186                 return;
1187
1188         console_verbose();
1189         printk("%s: %08x\n",str,nr);
1190         print_modules();
1191         printk("PC: [<%08lx>]",fp->pc);
1192         print_symbol(" %s\n", fp->pc);
1193         printk("\nSR: %04x  SP: %p  a2: %08lx\n",
1194                fp->sr, fp, fp->a2);
1195         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
1196                fp->d0, fp->d1, fp->d2, fp->d3);
1197         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
1198                fp->d4, fp->d5, fp->a0, fp->a1);
1199
1200         printk("Process %s (pid: %d, stackpage=%08lx)\n",
1201                 current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
1202         show_stack(NULL, (unsigned long *)fp);
1203         do_exit(SIGSEGV);
1204 }
1205
1206 /*
1207  * This function is called if an error occur while accessing
1208  * user-space from the fpsp040 code.
1209  */
1210 asmlinkage void fpsp040_die(void)
1211 {
1212         do_exit(SIGSEGV);
1213 }
1214
1215 #ifdef CONFIG_M68KFPU_EMU
1216 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1217 {
1218         siginfo_t info;
1219
1220         info.si_signo = signal;
1221         info.si_errno = 0;
1222         info.si_code = code;
1223         info.si_addr = addr;
1224         force_sig_info(signal, &info, current);
1225 }
1226 #endif