arch/m68k/kernel/traps.c

   1 /*
   2  *  linux/arch/m68k/kernel/traps.c
   3  *
   4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
   5  *
   6  *  68040 fixes by Michael Rausch
   7  *  68040 fixes by Martin Apel
   8  *  68040 fixes and writeback by Richard Zidlicky
   9  *  68060 fixes by Roman Hodek
  10  *  68060 fixes by Jesper Skov
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 /*
  18  * Sets up all exception vectors
  19  */
  20
  21 #include <linux/sched.h>
  22 #include <linux/signal.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/user.h>
  27 #include <linux/string.h>
  28 #include <linux/linkage.h>
  29 #include <linux/init.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/kallsyms.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/fpu.h>
  35 #include <asm/system.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/traps.h>
  38 #include <asm/pgalloc.h>
  39 #include <asm/machdep.h>
  40 #include <asm/siginfo.h>
  41
  42 /* assembler routines */
  43 asmlinkage void system_call(void);
  44 asmlinkage void buserr(void);
  45 asmlinkage void trap(void);
  46 asmlinkage void nmihandler(void);
  47 #ifdef CONFIG_M68KFPU_EMU
  48 asmlinkage void fpu_emu(void);
  49 #endif
  50
  51 e_vector vectors[256] = {
  52         [VEC_BUSERR]    = buserr,
  53         [VEC_SYS]       = system_call,
  54 };
  55
  56 /* nmi handler for the Amiga */
  57 asm(".text\n"
  58     __ALIGN_STR "\n"
  59     "nmihandler: rte");
  60
  61 /*
  62  * this must be called very early as the kernel might
  63  * use some instruction that are emulated on the 060
  64  */
  65 void __init base_trap_init(void)
  66 {
  67         if(MACH_IS_SUN3X) {
  68                 extern e_vector *sun3x_prom_vbr;
  69
  70                 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
  71         }
  72
  73         /* setup the exception vector table */
  74         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
  75
  76         if (CPU_IS_060) {
  77                 /* set up ISP entry points */
  78                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
  79
  80                 vectors[VEC_UNIMPII] = unimp_vec;
  81         }
  82 }
  83
  84 void __init trap_init (void)
  85 {
  86         int i;
  87
  88         for (i = VEC_SPUR; i <= VEC_INT7; i++)
  89                 vectors[i] = bad_inthandler;
  90
  91         for (i = 0; i < VEC_USER; i++)
  92                 if (!vectors[i])
  93                         vectors[i] = trap;
  94
  95         for (i = VEC_USER; i < 256; i++)
  96                 vectors[i] = bad_inthandler;
  97
  98 #ifdef CONFIG_M68KFPU_EMU
  99         if (FPU_IS_EMU)
 100                 vectors[VEC_LINE11] = fpu_emu;
 101 #endif
 102
 103         if (CPU_IS_040 && !FPU_IS_EMU) {
 104                 /* set up FPSP entry points */
 105                 asmlinkage void dz_vec(void) asm ("dz");
 106                 asmlinkage void inex_vec(void) asm ("inex");
 107                 asmlinkage void ovfl_vec(void) asm ("ovfl");
 108                 asmlinkage void unfl_vec(void) asm ("unfl");
 109                 asmlinkage void snan_vec(void) asm ("snan");
 110                 asmlinkage void operr_vec(void) asm ("operr");
 111                 asmlinkage void bsun_vec(void) asm ("bsun");
 112                 asmlinkage void fline_vec(void) asm ("fline");
 113                 asmlinkage void unsupp_vec(void) asm ("unsupp");
 114
 115                 vectors[VEC_FPDIVZ] = dz_vec;
 116                 vectors[VEC_FPIR] = inex_vec;
 117                 vectors[VEC_FPOVER] = ovfl_vec;
 118                 vectors[VEC_FPUNDER] = unfl_vec;
 119                 vectors[VEC_FPNAN] = snan_vec;
 120                 vectors[VEC_FPOE] = operr_vec;
 121                 vectors[VEC_FPBRUC] = bsun_vec;
 122                 vectors[VEC_LINE11] = fline_vec;
 123                 vectors[VEC_FPUNSUP] = unsupp_vec;
 124         }
 125
 126         if (CPU_IS_060 && !FPU_IS_EMU) {
 127                 /* set up IFPSP entry points */
 128                 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
 129                 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
 130                 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
 131                 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
 132                 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
 133                 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
 134                 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
 135                 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
 136                 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
 137
 138                 vectors[VEC_FPNAN] = snan_vec6;
 139                 vectors[VEC_FPOE] = operr_vec6;
 140                 vectors[VEC_FPOVER] = ovfl_vec6;
 141                 vectors[VEC_FPUNDER] = unfl_vec6;
 142                 vectors[VEC_FPDIVZ] = dz_vec6;
 143                 vectors[VEC_FPIR] = inex_vec6;
 144                 vectors[VEC_LINE11] = fline_vec6;
 145                 vectors[VEC_FPUNSUP] = unsupp_vec6;
 146                 vectors[VEC_UNIMPEA] = effadd_vec6;
 147         }
 148
 149         /* if running on an amiga, make the NMI interrupt do nothing */
 150         if (MACH_IS_AMIGA) {
 151                 vectors[VEC_INT7] = nmihandler;
 152         }
 153 }
 154
 155
 156 static const char *vec_names[] = {
 157         [VEC_RESETSP]   = "RESET SP",
 158         [VEC_RESETPC]   = "RESET PC",
 159         [VEC_BUSERR]    = "BUS ERROR",
 160         [VEC_ADDRERR]   = "ADDRESS ERROR",
 161         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
 162         [VEC_ZERODIV]   = "ZERO DIVIDE",
 163         [VEC_CHK]       = "CHK",
 164         [VEC_TRAP]      = "TRAPcc",
 165         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
 166         [VEC_TRACE]     = "TRACE",
 167         [VEC_LINE10]    = "LINE 1010",
 168         [VEC_LINE11]    = "LINE 1111",
 169         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
 170         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
 171         [VEC_FORMAT]    = "FORMAT ERROR",
 172         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
 173         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
 174         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
 175         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
 176         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
 177         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
 178         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
 179         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
 180         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
 181         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
 182         [VEC_INT1]      = "LEVEL 1 INT",
 183         [VEC_INT2]      = "LEVEL 2 INT",
 184         [VEC_INT3]      = "LEVEL 3 INT",
 185         [VEC_INT4]      = "LEVEL 4 INT",
 186         [VEC_INT5]      = "LEVEL 5 INT",
 187         [VEC_INT6]      = "LEVEL 6 INT",
 188         [VEC_INT7]      = "LEVEL 7 INT",
 189         [VEC_SYS]       = "SYSCALL",
 190         [VEC_TRAP1]     = "TRAP #1",
 191         [VEC_TRAP2]     = "TRAP #2",
 192         [VEC_TRAP3]     = "TRAP #3",
 193         [VEC_TRAP4]     = "TRAP #4",
 194         [VEC_TRAP5]     = "TRAP #5",
 195         [VEC_TRAP6]     = "TRAP #6",
 196         [VEC_TRAP7]     = "TRAP #7",
 197         [VEC_TRAP8]     = "TRAP #8",
 198         [VEC_TRAP9]     = "TRAP #9",
 199         [VEC_TRAP10]    = "TRAP #10",
 200         [VEC_TRAP11]    = "TRAP #11",
 201         [VEC_TRAP12]    = "TRAP #12",
 202         [VEC_TRAP13]    = "TRAP #13",
 203         [VEC_TRAP14]    = "TRAP #14",
 204         [VEC_TRAP15]    = "TRAP #15",
 205         [VEC_FPBRUC]    = "FPCP BSUN",
 206         [VEC_FPIR]      = "FPCP INEXACT",
 207         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
 208         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
 209         [VEC_FPOE]      = "FPCP OPERAND ERROR",
 210         [VEC_FPOVER]    = "FPCP OVERFLOW",
 211         [VEC_FPNAN]     = "FPCP SNAN",
 212         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
 213         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 214         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 215         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 216         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 217         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 218         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 219         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 220         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 221 };
 222
 223 static const char *space_names[] = {
 224         [0]             = "Space 0",
 225         [USER_DATA]     = "User Data",
 226         [USER_PROGRAM]  = "User Program",
 227 #ifndef CONFIG_SUN3
 228         [3]             = "Space 3",
 229 #else
 230         [FC_CONTROL]    = "Control",
 231 #endif
 232         [4]             = "Space 4",
 233         [SUPER_DATA]    = "Super Data",
 234         [SUPER_PROGRAM] = "Super Program",
 235         [CPU_SPACE]     = "CPU"
 236 };
 237
 238 void die_if_kernel(char *,struct pt_regs *,int);
 239 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 240                              unsigned long error_code);
 241 int send_fault_sig(struct pt_regs *regs);
 242
 243 asmlinkage void trap_c(struct frame *fp);
 244
 245 #if defined (CONFIG_M68060)
 246 static inline void access_error060 (struct frame *fp)
 247 {
 248         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
 249
 250 #ifdef DEBUG
 251         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 252 #endif
 253
 254         if (fslw & MMU060_BPE) {
 255                 /* branch prediction error -> clear branch cache */
 256                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 257                                       "orl   #0x00400000,%/d0\n\t"
 258                                       "movec %/d0,%/cacr"
 259                                       : : : "d0" );
 260                 /* return if there's no other error */
 261                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 262                         return;
 263         }
 264
 265         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 266                 unsigned long errorcode;
 267                 unsigned long addr = fp->un.fmt4.effaddr;
 268
 269                 if (fslw & MMU060_MA)
 270                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 271
 272                 errorcode = 1;
 273                 if (fslw & MMU060_DESC_ERR) {
 274                         __flush_tlb040_one(addr);
 275                         errorcode = 0;
 276                 }
 277                 if (fslw & MMU060_W)
 278                         errorcode |= 2;
 279 #ifdef DEBUG
 280                 printk("errorcode = %d\n", errorcode );
 281 #endif
 282                 do_page_fault(&fp->ptregs, addr, errorcode);
 283         } else if (fslw & (MMU060_SEE)){
 284                 /* Software Emulation Error.
 285                  * fault during mem_read/mem_write in ifpsp060/os.S
 286                  */
 287                 send_fault_sig(&fp->ptregs);
 288         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 289                    send_fault_sig(&fp->ptregs) > 0) {
 290                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 291                 printk( "68060 access error, fslw=%lx\n", fslw );
 292                 trap_c( fp );
 293         }
 294 }
 295 #endif /* CONFIG_M68060 */
 296
 297 #if defined (CONFIG_M68040)
 298 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 299 {
 300         unsigned long mmusr;
 301         mm_segment_t old_fs = get_fs();
 302
 303         set_fs(MAKE_MM_SEG(wbs));
 304
 305         if (iswrite)
 306                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 307         else
 308                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 309
 310         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 311
 312         set_fs(old_fs);
 313
 314         return mmusr;
 315 }
 316
 317 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 318                                    unsigned long wbd)
 319 {
 320         int res = 0;
 321         mm_segment_t old_fs = get_fs();
 322
 323         /* set_fs can not be moved, otherwise put_user() may oops */
 324         set_fs(MAKE_MM_SEG(wbs));
 325
 326         switch (wbs & WBSIZ_040) {
 327         case BA_SIZE_BYTE:
 328                 res = put_user(wbd & 0xff, (char __user *)wba);
 329                 break;
 330         case BA_SIZE_WORD:
 331                 res = put_user(wbd & 0xffff, (short __user *)wba);
 332                 break;
 333         case BA_SIZE_LONG:
 334                 res = put_user(wbd, (int __user *)wba);
 335                 break;
 336         }
 337
 338         /* set_fs can not be moved, otherwise put_user() may oops */
 339         set_fs(old_fs);
 340
 341
 342 #ifdef DEBUG
 343         printk("do_040writeback1, res=%d\n",res);
 344 #endif
 345
 346         return res;
 347 }
 348
 349 /* after an exception in a writeback the stack frame corresponding
 350  * to that exception is discarded, set a few bits in the old frame
 351  * to simulate what it should look like
 352  */
 353 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 354 {
 355         fp->un.fmt7.faddr = wba;
 356         fp->un.fmt7.ssw = wbs & 0xff;
 357         if (wba != current->thread.faddr)
 358             fp->un.fmt7.ssw |= MA_040;
 359 }
 360
 361 static inline void do_040writebacks(struct frame *fp)
 362 {
 363         int res = 0;
 364 #if 0
 365         if (fp->un.fmt7.wb1s & WBV_040)
 366                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 367 #endif
 368
 369         if ((fp->un.fmt7.wb2s & WBV_040) &&
 370             !(fp->un.fmt7.wb2s & WBTT_040)) {
 371                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 372                                        fp->un.fmt7.wb2d);
 373                 if (res)
 374                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 375                 else
 376                         fp->un.fmt7.wb2s = 0;
 377         }
 378
 379         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 380         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 381                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 382                                        fp->un.fmt7.wb3d);
 383                 if (res)
 384                     {
 385                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 386
 387                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 388                         fp->un.fmt7.wb3s &= (~WBV_040);
 389                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 390                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 391                     }
 392                 else
 393                         fp->un.fmt7.wb3s = 0;
 394         }
 395
 396         if (res)
 397                 send_fault_sig(&fp->ptregs);
 398 }
 399
 400 /*
 401  * called from sigreturn(), must ensure userspace code didn't
 402  * manipulate exception frame to circumvent protection, then complete
 403  * pending writebacks
 404  * we just clear TM2 to turn it into an userspace access
 405  */
 406 asmlinkage void berr_040cleanup(struct frame *fp)
 407 {
 408         fp->un.fmt7.wb2s &= ~4;
 409         fp->un.fmt7.wb3s &= ~4;
 410
 411         do_040writebacks(fp);
 412 }
 413
 414 static inline void access_error040(struct frame *fp)
 415 {
 416         unsigned short ssw = fp->un.fmt7.ssw;
 417         unsigned long mmusr;
 418
 419 #ifdef DEBUG
 420         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 421         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 422                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 423         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 424                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 425                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 426 #endif
 427
 428         if (ssw & ATC_040) {
 429                 unsigned long addr = fp->un.fmt7.faddr;
 430                 unsigned long errorcode;
 431
 432                 /*
 433                  * The MMU status has to be determined AFTER the address
 434                  * has been corrected if there was a misaligned access (MA).
 435                  */
 436                 if (ssw & MA_040)
 437                         addr = (addr + 7) & -8;
 438
 439                 /* MMU error, get the MMUSR info for this access */
 440                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 441 #ifdef DEBUG
 442                 printk("mmusr = %lx\n", mmusr);
 443 #endif
 444                 errorcode = 1;
 445                 if (!(mmusr & MMU_R_040)) {
 446                         /* clear the invalid atc entry */
 447                         __flush_tlb040_one(addr);
 448                         errorcode = 0;
 449                 }
 450
 451                 /* despite what documentation seems to say, RMW
 452                  * accesses have always both the LK and RW bits set */
 453                 if (!(ssw & RW_040) || (ssw & LK_040))
 454                         errorcode |= 2;
 455
 456                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 457 #ifdef DEBUG
 458                         printk("do_page_fault() !=0 \n");
 459 #endif
 460                         if (user_mode(&fp->ptregs)){
 461                                 /* delay writebacks after signal delivery */
 462 #ifdef DEBUG
 463                                 printk(".. was usermode - return\n");
 464 #endif
 465                                 return;
 466                         }
 467                         /* disable writeback into user space from kernel
 468                          * (if do_page_fault didn't fix the mapping,
 469                          * the writeback won't do good)
 470                          */
 471 #ifdef DEBUG
 472                         printk(".. disabling wb2\n");
 473 #endif
 474                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 475                                 fp->un.fmt7.wb2s &= ~WBV_040;
 476                 }
 477         } else if (send_fault_sig(&fp->ptregs) > 0) {
 478                 printk("68040 access error, ssw=%x\n", ssw);
 479                 trap_c(fp);
 480         }
 481
 482         do_040writebacks(fp);
 483 }
 484 #endif /* CONFIG_M68040 */
 485
 486 #if defined(CONFIG_SUN3)
 487 #include <asm/sun3mmu.h>
 488
 489 extern int mmu_emu_handle_fault (unsigned long, int, int);
 490
 491 /* sun3 version of bus_error030 */
 492
 493 static inline void bus_error030 (struct frame *fp)
 494 {
 495         unsigned char buserr_type = sun3_get_buserr ();
 496         unsigned long addr, errorcode;
 497         unsigned short ssw = fp->un.fmtb.ssw;
 498         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 499
 500 #ifdef DEBUG
 501         if (ssw & (FC | FB))
 502                 printk ("Instruction fault at %#010lx\n",
 503                         ssw & FC ?
 504                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 505                         :
 506                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 507         if (ssw & DF)
 508                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 509                         ssw & RW ? "read" : "write",
 510                         fp->un.fmtb.daddr,
 511                         space_names[ssw & DFC], fp->ptregs.pc);
 512 #endif
 513
 514         /*
 515          * Check if this page should be demand-mapped. This needs to go before
 516          * the testing for a bad kernel-space access (demand-mapping applies
 517          * to kernel accesses too).
 518          */
 519
 520         if ((ssw & DF)
 521             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 522                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 523                         return;
 524         }
 525
 526         /* Check for kernel-space pagefault (BAD). */
 527         if (fp->ptregs.sr & PS_S) {
 528                 /* kernel fault must be a data fault to user space */
 529                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 530                      // try checking the kernel mappings before surrender
 531                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 532                           return;
 533                         /* instruction fault or kernel data fault! */
 534                         if (ssw & (FC | FB))
 535                                 printk ("Instruction fault at %#010lx\n",
 536                                         fp->ptregs.pc);
 537                         if (ssw & DF) {
 538                                 /* was this fault incurred testing bus mappings? */
 539                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 540                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 541                                         send_fault_sig(&fp->ptregs);
 542                                         return;
 543                                 }
 544
 545                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 546                                         ssw & RW ? "read" : "write",
 547                                         fp->un.fmtb.daddr,
 548                                         space_names[ssw & DFC], fp->ptregs.pc);
 549                         }
 550                         printk ("BAD KERNEL BUSERR\n");
 551
 552                         die_if_kernel("Oops", &fp->ptregs,0);
 553                         force_sig(SIGKILL, current);
 554                         return;
 555                 }
 556         } else {
 557                 /* user fault */
 558                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 559                         /* not an instruction fault or data fault! BAD */
 560                         panic ("USER BUSERR w/o instruction or data fault");
 561         }
 562
 563
 564         /* First handle the data fault, if any.  */
 565         if (ssw & DF) {
 566                 addr = fp->un.fmtb.daddr;
 567
 568 // errorcode bit 0:     0 -> no page            1 -> protection fault
 569 // errorcode bit 1:     0 -> read fault         1 -> write fault
 570
 571 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 572 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 573
 574                 if (buserr_type & SUN3_BUSERR_PROTERR)
 575                         errorcode = 0x01;
 576                 else if (buserr_type & SUN3_BUSERR_INVALID)
 577                         errorcode = 0x00;
 578                 else {
 579 #ifdef DEBUG
 580                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 581                         printk ("invalid %s access at %#lx from pc %#lx\n",
 582                                 !(ssw & RW) ? "write" : "read", addr,
 583                                 fp->ptregs.pc);
 584 #endif
 585                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 586                         force_sig (SIGBUS, current);
 587                         return;
 588                 }
 589
 590 //todo: wtf is RM bit? --m
 591                 if (!(ssw & RW) || ssw & RM)
 592                         errorcode |= 0x02;
 593
 594                 /* Handle page fault. */
 595                 do_page_fault (&fp->ptregs, addr, errorcode);
 596
 597                 /* Retry the data fault now. */
 598                 return;
 599         }
 600
 601         /* Now handle the instruction fault. */
 602
 603         /* Get the fault address. */
 604         if (fp->ptregs.format == 0xA)
 605                 addr = fp->ptregs.pc + 4;
 606         else
 607                 addr = fp->un.fmtb.baddr;
 608         if (ssw & FC)
 609                 addr -= 2;
 610
 611         if (buserr_type & SUN3_BUSERR_INVALID) {
 612                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 613                         do_page_fault (&fp->ptregs, addr, 0);
 614        } else {
 615 #ifdef DEBUG
 616                 printk ("protection fault on insn access (segv).\n");
 617 #endif
 618                 force_sig (SIGSEGV, current);
 619        }
 620 }
 621 #else
 622 #if defined(CPU_M68020_OR_M68030)
 623 static inline void bus_error030 (struct frame *fp)
 624 {
 625         volatile unsigned short temp;
 626         unsigned short mmusr;
 627         unsigned long addr, errorcode;
 628         unsigned short ssw = fp->un.fmtb.ssw;
 629 #ifdef DEBUG
 630         unsigned long desc;
 631
 632         printk ("pid = %x  ", current->pid);
 633         printk ("SSW=%#06x  ", ssw);
 634
 635         if (ssw & (FC | FB))
 636                 printk ("Instruction fault at %#010lx\n",
 637                         ssw & FC ?
 638                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 639                         :
 640                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 641         if (ssw & DF)
 642                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 643                         ssw & RW ? "read" : "write",
 644                         fp->un.fmtb.daddr,
 645                         space_names[ssw & DFC], fp->ptregs.pc);
 646 #endif
 647
 648         /* ++andreas: If a data fault and an instruction fault happen
 649            at the same time map in both pages.  */
 650
 651         /* First handle the data fault, if any.  */
 652         if (ssw & DF) {
 653                 addr = fp->un.fmtb.daddr;
 654
 655 #ifdef DEBUG
 656                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 657                               "pmove %%psr,%1@"
 658                               : "=a&" (desc)
 659                               : "a" (&temp), "a" (addr), "d" (ssw));
 660 #else
 661                 asm volatile ("ptestr %2,%1@,#7\n\t"
 662                               "pmove %%psr,%0@"
 663                               : : "a" (&temp), "a" (addr), "d" (ssw));
 664 #endif
 665                 mmusr = temp;
 666
 667 #ifdef DEBUG
 668                 printk("mmusr is %#x for addr %#lx in task %p\n",
 669                        mmusr, addr, current);
 670                 printk("descriptor address is %#lx, contents %#lx\n",
 671                        __va(desc), *(unsigned long *)__va(desc));
 672 #endif
 673
 674                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 675                 if (!(ssw & RW) || (ssw & RM))
 676                         errorcode |= 2;
 677
 678                 if (mmusr & (MMU_I | MMU_WP)) {
 679                         if (ssw & 4) {
 680                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 681                                        ssw & RW ? "read" : "write",
 682                                        fp->un.fmtb.daddr,
 683                                        space_names[ssw & DFC], fp->ptregs.pc);
 684                                 goto buserr;
 685                         }
 686                         /* Don't try to do anything further if an exception was
 687                            handled. */
 688                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 689                                 return;
 690                 } else if (!(mmusr & MMU_I)) {
 691                         /* probably a 020 cas fault */
 692                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 693                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 694                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 695                         printk("invalid %s access at %#lx from pc %#lx\n",
 696                                !(ssw & RW) ? "write" : "read", addr,
 697                                fp->ptregs.pc);
 698                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 699                         force_sig(SIGSEGV, current);
 700                         return;
 701                 } else {
 702 #if 0
 703                         static volatile long tlong;
 704 #endif
 705
 706                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 707                                !(ssw & RW) ? "write" : "read", addr,
 708                                fp->ptregs.pc, ssw);
 709                         asm volatile ("ptestr #1,%1@,#0\n\t"
 710                                       "pmove %%psr,%0@"
 711                                       : /* no outputs */
 712                                       : "a" (&temp), "a" (addr));
 713                         mmusr = temp;
 714
 715                         printk ("level 0 mmusr is %#x\n", mmusr);
 716 #if 0
 717                         asm volatile ("pmove %%tt0,%0@"
 718                                       : /* no outputs */
 719                                       : "a" (&tlong));
 720                         printk("tt0 is %#lx, ", tlong);
 721                         asm volatile ("pmove %%tt1,%0@"
 722                                       : /* no outputs */
 723                                       : "a" (&tlong));
 724                         printk("tt1 is %#lx\n", tlong);
 725 #endif
 726 #ifdef DEBUG
 727                         printk("Unknown SIGSEGV - 1\n");
 728 #endif
 729                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 730                         force_sig(SIGSEGV, current);
 731                         return;
 732                 }
 733
 734                 /* setup an ATC entry for the access about to be retried */
 735                 if (!(ssw & RW) || (ssw & RM))
 736                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 737                                       : "a" (addr), "d" (ssw));
 738                 else
 739                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 740                                       : "a" (addr), "d" (ssw));
 741         }
 742
 743         /* Now handle the instruction fault. */
 744
 745         if (!(ssw & (FC|FB)))
 746                 return;
 747
 748         if (fp->ptregs.sr & PS_S) {
 749                 printk("Instruction fault at %#010lx\n",
 750                         fp->ptregs.pc);
 751         buserr:
 752                 printk ("BAD KERNEL BUSERR\n");
 753                 die_if_kernel("Oops",&fp->ptregs,0);
 754                 force_sig(SIGKILL, current);
 755                 return;
 756         }
 757
 758         /* get the fault address */
 759         if (fp->ptregs.format == 10)
 760                 addr = fp->ptregs.pc + 4;
 761         else
 762                 addr = fp->un.fmtb.baddr;
 763         if (ssw & FC)
 764                 addr -= 2;
 765
 766         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 767                 /* Insn fault on same page as data fault.  But we
 768                    should still create the ATC entry.  */
 769                 goto create_atc_entry;
 770
 771 #ifdef DEBUG
 772         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 773                       "pmove %%psr,%1@"
 774                       : "=a&" (desc)
 775                       : "a" (&temp), "a" (addr));
 776 #else
 777         asm volatile ("ptestr #1,%1@,#7\n\t"
 778                       "pmove %%psr,%0@"
 779                       : : "a" (&temp), "a" (addr));
 780 #endif
 781         mmusr = temp;
 782
 783 #ifdef DEBUG
 784         printk ("mmusr is %#x for addr %#lx in task %p\n",
 785                 mmusr, addr, current);
 786         printk ("descriptor address is %#lx, contents %#lx\n",
 787                 __va(desc), *(unsigned long *)__va(desc));
 788 #endif
 789
 790         if (mmusr & MMU_I)
 791                 do_page_fault (&fp->ptregs, addr, 0);
 792         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 793                 printk ("invalid insn access at %#lx from pc %#lx\n",
 794                         addr, fp->ptregs.pc);
 795 #ifdef DEBUG
 796                 printk("Unknown SIGSEGV - 2\n");
 797 #endif
 798                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 799                 force_sig(SIGSEGV, current);
 800                 return;
 801         }
 802
 803 create_atc_entry:
 804         /* setup an ATC entry for the access about to be retried */
 805         asm volatile ("ploadr #2,%0@" : /* no outputs */
 806                       : "a" (addr));
 807 }
 808 #endif /* CPU_M68020_OR_M68030 */
 809 #endif /* !CONFIG_SUN3 */
 810
 811 asmlinkage void buserr_c(struct frame *fp)
 812 {
 813         /* Only set esp0 if coming from user mode */
 814         if (user_mode(&fp->ptregs))
 815                 current->thread.esp0 = (unsigned long) fp;
 816
 817 #ifdef DEBUG
 818         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 819 #endif
 820
 821         switch (fp->ptregs.format) {
 822 #if defined (CONFIG_M68060)
 823         case 4:                         /* 68060 access error */
 824           access_error060 (fp);
 825           break;
 826 #endif
 827 #if defined (CONFIG_M68040)
 828         case 0x7:                       /* 68040 access error */
 829           access_error040 (fp);
 830           break;
 831 #endif
 832 #if defined (CPU_M68020_OR_M68030)
 833         case 0xa:
 834         case 0xb:
 835           bus_error030 (fp);
 836           break;
 837 #endif
 838         default:
 839           die_if_kernel("bad frame format",&fp->ptregs,0);
 840 #ifdef DEBUG
 841           printk("Unknown SIGSEGV - 4\n");
 842 #endif
 843           force_sig(SIGSEGV, current);
 844         }
 845 }
 846
 847
 848 static int kstack_depth_to_print = 48;
 849
 850 void show_trace(unsigned long *stack)
 851 {
 852         unsigned long *endstack;
 853         unsigned long addr;
 854         int i;
 855
 856         printk("Call Trace:");
 857         addr = (unsigned long)stack + THREAD_SIZE - 1;
 858         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 859         i = 0;
 860         while (stack + 1 <= endstack) {
 861                 addr = *stack++;
 862                 /*
 863                  * If the address is either in the text segment of the
 864                  * kernel, or in the region which contains vmalloc'ed
 865                  * memory, it *may* be the address of a calling
 866                  * routine; if so, print it so that someone tracing
 867                  * down the cause of the crash will be able to figure
 868                  * out the call path that was taken.
 869                  */
 870                 if (__kernel_text_address(addr)) {
 871 #ifndef CONFIG_KALLSYMS
 872                         if (i % 5 == 0)
 873                                 printk("\n       ");
 874 #endif
 875                         printk(" [<%08lx>]", addr);
 876                         print_symbol(" %s\n", addr);
 877                         i++;
 878                 }
 879         }
 880         printk("\n");
 881 }
 882
 883 void show_registers(struct pt_regs *regs)
 884 {
 885         struct frame *fp = (struct frame *)regs;
 886         mm_segment_t old_fs = get_fs();
 887         u16 c, *cp;
 888         unsigned long addr;
 889         int i;
 890
 891         print_modules();
 892         printk("PC: [<%08lx>]",regs->pc);
 893         print_symbol(" %s", regs->pc);
 894         printk("\nSR: %04x  SP: %p  a2: %08lx\n",
 895                regs->sr, regs, regs->a2);
 896         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 897                regs->d0, regs->d1, regs->d2, regs->d3);
 898         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 899                regs->d4, regs->d5, regs->a0, regs->a1);
 900
 901         printk("Process %s (pid: %d, task=%p)\n",
 902                 current->comm, task_pid_nr(current), current);
 903         addr = (unsigned long)&fp->un;
 904         printk("Frame format=%X ", regs->format);
 905         switch (regs->format) {
 906         case 0x2:
 907                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 908                 addr += sizeof(fp->un.fmt2);
 909                 break;
 910         case 0x3:
 911                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 912                 addr += sizeof(fp->un.fmt3);
 913                 break;
 914         case 0x4:
 915                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 916                         : "eff addr=%08lx pc=%08lx\n"),
 917                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 918                 addr += sizeof(fp->un.fmt4);
 919                 break;
 920         case 0x7:
 921                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 922                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 923                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 924                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 925                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 926                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 927                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 928                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 929                 printk("push data: %08lx %08lx %08lx %08lx\n",
 930                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 931                         fp->un.fmt7.pd3);
 932                 addr += sizeof(fp->un.fmt7);
 933                 break;
 934         case 0x9:
 935                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 936                 addr += sizeof(fp->un.fmt9);
 937                 break;
 938         case 0xa:
 939                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 940                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 941                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 942                 addr += sizeof(fp->un.fmta);
 943                 break;
 944         case 0xb:
 945                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 946                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 947                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 948                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 949                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 950                 addr += sizeof(fp->un.fmtb);
 951                 break;
 952         default:
 953                 printk("\n");
 954         }
 955         show_stack(NULL, (unsigned long *)addr);
 956
 957         printk("Code:");
 958         set_fs(KERNEL_DS);
 959         cp = (u16 *)regs->pc;
 960         for (i = -8; i < 16; i++) {
 961                 if (get_user(c, cp + i) && i >= 0) {
 962                         printk(" Bad PC value.");
 963                         break;
 964                 }
 965                 printk(i ? " %04x" : " <%04x>", c);
 966         }
 967         set_fs(old_fs);
 968         printk ("\n");
 969 }
 970
 971 void show_stack(struct task_struct *task, unsigned long *stack)
 972 {
 973         unsigned long *p;
 974         unsigned long *endstack;
 975         int i;
 976
 977         if (!stack) {
 978                 if (task)
 979                         stack = (unsigned long *)task->thread.esp0;
 980                 else
 981                         stack = (unsigned long *)&stack;
 982         }
 983         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 984
 985         printk("Stack from %08lx:", (unsigned long)stack);
 986         p = stack;
 987         for (i = 0; i < kstack_depth_to_print; i++) {
 988                 if (p + 1 > endstack)
 989                         break;
 990                 if (i % 8 == 0)
 991                         printk("\n       ");
 992                 printk(" %08lx", *p++);
 993         }
 994         printk("\n");
 995         show_trace(stack);
 996 }
 997
 998 /*
 999  * The architecture-independent backtrace generator
1000  */
1001 void dump_stack(void)
1002 {
1003         unsigned long stack;
1004
1005         show_trace(&stack);
1006 }
1007
1008 EXPORT_SYMBOL(dump_stack);
1009
1010 void bad_super_trap (struct frame *fp)
1011 {
1012         console_verbose();
1013         if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
1014                 printk ("*** %s ***   FORMAT=%X\n",
1015                         vec_names[(fp->ptregs.vector) >> 2],
1016                         fp->ptregs.format);
1017         else
1018                 printk ("*** Exception %d ***   FORMAT=%X\n",
1019                         (fp->ptregs.vector) >> 2,
1020                         fp->ptregs.format);
1021         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1022                 unsigned short ssw = fp->un.fmtb.ssw;
1023
1024                 printk ("SSW=%#06x  ", ssw);
1025
1026                 if (ssw & RC)
1027                         printk ("Pipe stage C instruction fault at %#010lx\n",
1028                                 (fp->ptregs.format) == 0xA ?
1029                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1030                 if (ssw & RB)
1031                         printk ("Pipe stage B instruction fault at %#010lx\n",
1032                                 (fp->ptregs.format) == 0xA ?
1033                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1034                 if (ssw & DF)
1035                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1036                                 ssw & RW ? "read" : "write",
1037                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1038                                 fp->ptregs.pc);
1039         }
1040         printk ("Current process id is %d\n", task_pid_nr(current));
1041         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1042 }
1043
1044 asmlinkage void trap_c(struct frame *fp)
1045 {
1046         int sig;
1047         siginfo_t info;
1048
1049         if (fp->ptregs.sr & PS_S) {
1050                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1051                         /* traced a trapping instruction */
1052                         current->ptrace |= PT_DTRACE;
1053                 } else
1054                         bad_super_trap(fp);
1055                 return;
1056         }
1057
1058         /* send the appropriate signal to the user program */
1059         switch ((fp->ptregs.vector) >> 2) {
1060             case VEC_ADDRERR:
1061                 info.si_code = BUS_ADRALN;
1062                 sig = SIGBUS;
1063                 break;
1064             case VEC_ILLEGAL:
1065             case VEC_LINE10:
1066             case VEC_LINE11:
1067                 info.si_code = ILL_ILLOPC;
1068                 sig = SIGILL;
1069                 break;
1070             case VEC_PRIV:
1071                 info.si_code = ILL_PRVOPC;
1072                 sig = SIGILL;
1073                 break;
1074             case VEC_COPROC:
1075                 info.si_code = ILL_COPROC;
1076                 sig = SIGILL;
1077                 break;
1078             case VEC_TRAP1:
1079             case VEC_TRAP2:
1080             case VEC_TRAP3:
1081             case VEC_TRAP4:
1082             case VEC_TRAP5:
1083             case VEC_TRAP6:
1084             case VEC_TRAP7:
1085             case VEC_TRAP8:
1086             case VEC_TRAP9:
1087             case VEC_TRAP10:
1088             case VEC_TRAP11:
1089             case VEC_TRAP12:
1090             case VEC_TRAP13:
1091             case VEC_TRAP14:
1092                 info.si_code = ILL_ILLTRP;
1093                 sig = SIGILL;
1094                 break;
1095             case VEC_FPBRUC:
1096             case VEC_FPOE:
1097             case VEC_FPNAN:
1098                 info.si_code = FPE_FLTINV;
1099                 sig = SIGFPE;
1100                 break;
1101             case VEC_FPIR:
1102                 info.si_code = FPE_FLTRES;
1103                 sig = SIGFPE;
1104                 break;
1105             case VEC_FPDIVZ:
1106                 info.si_code = FPE_FLTDIV;
1107                 sig = SIGFPE;
1108                 break;
1109             case VEC_FPUNDER:
1110                 info.si_code = FPE_FLTUND;
1111                 sig = SIGFPE;
1112                 break;
1113             case VEC_FPOVER:
1114                 info.si_code = FPE_FLTOVF;
1115                 sig = SIGFPE;
1116                 break;
1117             case VEC_ZERODIV:
1118                 info.si_code = FPE_INTDIV;
1119                 sig = SIGFPE;
1120                 break;
1121             case VEC_CHK:
1122             case VEC_TRAP:
1123                 info.si_code = FPE_INTOVF;
1124                 sig = SIGFPE;
1125                 break;
1126             case VEC_TRACE:             /* ptrace single step */
1127                 info.si_code = TRAP_TRACE;
1128                 sig = SIGTRAP;
1129                 break;
1130             case VEC_TRAP15:            /* breakpoint */
1131                 info.si_code = TRAP_BRKPT;
1132                 sig = SIGTRAP;
1133                 break;
1134             default:
1135                 info.si_code = ILL_ILLOPC;
1136                 sig = SIGILL;
1137                 break;
1138         }
1139         info.si_signo = sig;
1140         info.si_errno = 0;
1141         switch (fp->ptregs.format) {
1142             default:
1143                 info.si_addr = (void *) fp->ptregs.pc;
1144                 break;
1145             case 2:
1146                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1147                 break;
1148             case 7:
1149                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1150                 break;
1151             case 9:
1152                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1153                 break;
1154             case 10:
1155                 info.si_addr = (void *) fp->un.fmta.daddr;
1156                 break;
1157             case 11:
1158                 info.si_addr = (void *) fp->un.fmtb.daddr;
1159                 break;
1160         }
1161         force_sig_info (sig, &info, current);
1162 }
1163
1164 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1165 {
1166         if (!(fp->sr & PS_S))
1167                 return;
1168
1169         console_verbose();
1170         printk("%s: %08x\n",str,nr);
1171         show_registers(fp);
1172         add_taint(TAINT_DIE);
1173         do_exit(SIGSEGV);
1174 }
1175
1176 /*
1177  * This function is called if an error occur while accessing
1178  * user-space from the fpsp040 code.
1179  */
1180 asmlinkage void fpsp040_die(void)
1181 {
1182         do_exit(SIGSEGV);
1183 }
1184
1185 #ifdef CONFIG_M68KFPU_EMU
1186 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1187 {
1188         siginfo_t info;
1189
1190         info.si_signo = signal;
1191         info.si_errno = 0;
1192         info.si_code = code;
1193         info.si_addr = addr;
1194         force_sig_info(signal, &info, current);
1195 }
1196 #endif