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   1 /*
   2  *  linux/arch/m68k/kernel/traps.c
   3  *
   4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
   5  *
   6  *  68040 fixes by Michael Rausch
   7  *  68040 fixes by Martin Apel
   8  *  68040 fixes and writeback by Richard Zidlicky
   9  *  68060 fixes by Roman Hodek
  10  *  68060 fixes by Jesper Skov
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 /*
  18  * Sets up all exception vectors
  19  */
  20
  21 #include <linux/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/a.out.h>
  27 #include <linux/user.h>
  28 #include <linux/string.h>
  29 #include <linux/linkage.h>
  30 #include <linux/init.h>
  31 #include <linux/ptrace.h>
  32 #include <linux/kallsyms.h>
  33
  34 #include <asm/setup.h>
  35 #include <asm/fpu.h>
  36 #include <asm/system.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/traps.h>
  39 #include <asm/pgalloc.h>
  40 #include <asm/machdep.h>
  41 #include <asm/siginfo.h>
  42
  43 /* assembler routines */
  44 asmlinkage void system_call(void);
  45 asmlinkage void buserr(void);
  46 asmlinkage void trap(void);
  47 asmlinkage void nmihandler(void);
  48 #ifdef CONFIG_M68KFPU_EMU
  49 asmlinkage void fpu_emu(void);
  50 #endif
  51
  52 e_vector vectors[256] = {
  53         [VEC_BUSERR]    = buserr,
  54         [VEC_SYS]       = system_call,
  55 };
  56
  57 /* nmi handler for the Amiga */
  58 asm(".text\n"
  59     __ALIGN_STR "\n"
  60     "nmihandler: rte");
  61
  62 /*
  63  * this must be called very early as the kernel might
  64  * use some instruction that are emulated on the 060
  65  */
  66 void __init base_trap_init(void)
  67 {
  68         if(MACH_IS_SUN3X) {
  69                 extern e_vector *sun3x_prom_vbr;
  70
  71                 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
  72         }
  73
  74         /* setup the exception vector table */
  75         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
  76
  77         if (CPU_IS_060) {
  78                 /* set up ISP entry points */
  79                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
  80
  81                 vectors[VEC_UNIMPII] = unimp_vec;
  82         }
  83 }
  84
  85 void __init trap_init (void)
  86 {
  87         int i;
  88
  89         for (i = VEC_SPUR; i <= VEC_INT7; i++)
  90                 vectors[i] = bad_inthandler;
  91
  92         for (i = 0; i < VEC_USER; i++)
  93                 if (!vectors[i])
  94                         vectors[i] = trap;
  95
  96         for (i = VEC_USER; i < 256; i++)
  97                 vectors[i] = bad_inthandler;
  98
  99 #ifdef CONFIG_M68KFPU_EMU
 100         if (FPU_IS_EMU)
 101                 vectors[VEC_LINE11] = fpu_emu;
 102 #endif
 103
 104         if (CPU_IS_040 && !FPU_IS_EMU) {
 105                 /* set up FPSP entry points */
 106                 asmlinkage void dz_vec(void) asm ("dz");
 107                 asmlinkage void inex_vec(void) asm ("inex");
 108                 asmlinkage void ovfl_vec(void) asm ("ovfl");
 109                 asmlinkage void unfl_vec(void) asm ("unfl");
 110                 asmlinkage void snan_vec(void) asm ("snan");
 111                 asmlinkage void operr_vec(void) asm ("operr");
 112                 asmlinkage void bsun_vec(void) asm ("bsun");
 113                 asmlinkage void fline_vec(void) asm ("fline");
 114                 asmlinkage void unsupp_vec(void) asm ("unsupp");
 115
 116                 vectors[VEC_FPDIVZ] = dz_vec;
 117                 vectors[VEC_FPIR] = inex_vec;
 118                 vectors[VEC_FPOVER] = ovfl_vec;
 119                 vectors[VEC_FPUNDER] = unfl_vec;
 120                 vectors[VEC_FPNAN] = snan_vec;
 121                 vectors[VEC_FPOE] = operr_vec;
 122                 vectors[VEC_FPBRUC] = bsun_vec;
 123                 vectors[VEC_LINE11] = fline_vec;
 124                 vectors[VEC_FPUNSUP] = unsupp_vec;
 125         }
 126
 127         if (CPU_IS_060 && !FPU_IS_EMU) {
 128                 /* set up IFPSP entry points */
 129                 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
 130                 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
 131                 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
 132                 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
 133                 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
 134                 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
 135                 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
 136                 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
 137                 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
 138
 139                 vectors[VEC_FPNAN] = snan_vec6;
 140                 vectors[VEC_FPOE] = operr_vec6;
 141                 vectors[VEC_FPOVER] = ovfl_vec6;
 142                 vectors[VEC_FPUNDER] = unfl_vec6;
 143                 vectors[VEC_FPDIVZ] = dz_vec6;
 144                 vectors[VEC_FPIR] = inex_vec6;
 145                 vectors[VEC_LINE11] = fline_vec6;
 146                 vectors[VEC_FPUNSUP] = unsupp_vec6;
 147                 vectors[VEC_UNIMPEA] = effadd_vec6;
 148         }
 149
 150         /* if running on an amiga, make the NMI interrupt do nothing */
 151         if (MACH_IS_AMIGA) {
 152                 vectors[VEC_INT7] = nmihandler;
 153         }
 154 }
 155
 156
 157 static const char *vec_names[] = {
 158         [VEC_RESETSP]   = "RESET SP",
 159         [VEC_RESETPC]   = "RESET PC",
 160         [VEC_BUSERR]    = "BUS ERROR",
 161         [VEC_ADDRERR]   = "ADDRESS ERROR",
 162         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
 163         [VEC_ZERODIV]   = "ZERO DIVIDE",
 164         [VEC_CHK]       = "CHK",
 165         [VEC_TRAP]      = "TRAPcc",
 166         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
 167         [VEC_TRACE]     = "TRACE",
 168         [VEC_LINE10]    = "LINE 1010",
 169         [VEC_LINE11]    = "LINE 1111",
 170         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
 171         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
 172         [VEC_FORMAT]    = "FORMAT ERROR",
 173         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
 174         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
 175         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
 176         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
 177         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
 178         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
 179         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
 180         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
 181         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
 182         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
 183         [VEC_INT1]      = "LEVEL 1 INT",
 184         [VEC_INT2]      = "LEVEL 2 INT",
 185         [VEC_INT3]      = "LEVEL 3 INT",
 186         [VEC_INT4]      = "LEVEL 4 INT",
 187         [VEC_INT5]      = "LEVEL 5 INT",
 188         [VEC_INT6]      = "LEVEL 6 INT",
 189         [VEC_INT7]      = "LEVEL 7 INT",
 190         [VEC_SYS]       = "SYSCALL",
 191         [VEC_TRAP1]     = "TRAP #1",
 192         [VEC_TRAP2]     = "TRAP #2",
 193         [VEC_TRAP3]     = "TRAP #3",
 194         [VEC_TRAP4]     = "TRAP #4",
 195         [VEC_TRAP5]     = "TRAP #5",
 196         [VEC_TRAP6]     = "TRAP #6",
 197         [VEC_TRAP7]     = "TRAP #7",
 198         [VEC_TRAP8]     = "TRAP #8",
 199         [VEC_TRAP9]     = "TRAP #9",
 200         [VEC_TRAP10]    = "TRAP #10",
 201         [VEC_TRAP11]    = "TRAP #11",
 202         [VEC_TRAP12]    = "TRAP #12",
 203         [VEC_TRAP13]    = "TRAP #13",
 204         [VEC_TRAP14]    = "TRAP #14",
 205         [VEC_TRAP15]    = "TRAP #15",
 206         [VEC_FPBRUC]    = "FPCP BSUN",
 207         [VEC_FPIR]      = "FPCP INEXACT",
 208         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
 209         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
 210         [VEC_FPOE]      = "FPCP OPERAND ERROR",
 211         [VEC_FPOVER]    = "FPCP OVERFLOW",
 212         [VEC_FPNAN]     = "FPCP SNAN",
 213         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
 214         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 215         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 216         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 217         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 218         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 219         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 220         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 221         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 222 };
 223
 224 static const char *space_names[] = {
 225         [0]             = "Space 0",
 226         [USER_DATA]     = "User Data",
 227         [USER_PROGRAM]  = "User Program",
 228 #ifndef CONFIG_SUN3
 229         [3]             = "Space 3",
 230 #else
 231         [FC_CONTROL]    = "Control",
 232 #endif
 233         [4]             = "Space 4",
 234         [SUPER_DATA]    = "Super Data",
 235         [SUPER_PROGRAM] = "Super Program",
 236         [CPU_SPACE]     = "CPU"
 237 };
 238
 239 void die_if_kernel(char *,struct pt_regs *,int);
 240 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 241                              unsigned long error_code);
 242 int send_fault_sig(struct pt_regs *regs);
 243
 244 asmlinkage void trap_c(struct frame *fp);
 245
 246 #if defined (CONFIG_M68060)
 247 static inline void access_error060 (struct frame *fp)
 248 {
 249         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
 250
 251 #ifdef DEBUG
 252         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 253 #endif
 254
 255         if (fslw & MMU060_BPE) {
 256                 /* branch prediction error -> clear branch cache */
 257                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 258                                       "orl   #0x00400000,%/d0\n\t"
 259                                       "movec %/d0,%/cacr"
 260                                       : : : "d0" );
 261                 /* return if there's no other error */
 262                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 263                         return;
 264         }
 265
 266         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 267                 unsigned long errorcode;
 268                 unsigned long addr = fp->un.fmt4.effaddr;
 269
 270                 if (fslw & MMU060_MA)
 271                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 272
 273                 errorcode = 1;
 274                 if (fslw & MMU060_DESC_ERR) {
 275                         __flush_tlb040_one(addr);
 276                         errorcode = 0;
 277                 }
 278                 if (fslw & MMU060_W)
 279                         errorcode |= 2;
 280 #ifdef DEBUG
 281                 printk("errorcode = %d\n", errorcode );
 282 #endif
 283                 do_page_fault(&fp->ptregs, addr, errorcode);
 284         } else if (fslw & (MMU060_SEE)){
 285                 /* Software Emulation Error.
 286                  * fault during mem_read/mem_write in ifpsp060/os.S
 287                  */
 288                 send_fault_sig(&fp->ptregs);
 289         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 290                    send_fault_sig(&fp->ptregs) > 0) {
 291                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 292                 printk( "68060 access error, fslw=%lx\n", fslw );
 293                 trap_c( fp );
 294         }
 295 }
 296 #endif /* CONFIG_M68060 */
 297
 298 #if defined (CONFIG_M68040)
 299 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 300 {
 301         unsigned long mmusr;
 302         mm_segment_t old_fs = get_fs();
 303
 304         set_fs(MAKE_MM_SEG(wbs));
 305
 306         if (iswrite)
 307                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 308         else
 309                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 310
 311         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 312
 313         set_fs(old_fs);
 314
 315         return mmusr;
 316 }
 317
 318 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 319                                    unsigned long wbd)
 320 {
 321         int res = 0;
 322         mm_segment_t old_fs = get_fs();
 323
 324         /* set_fs can not be moved, otherwise put_user() may oops */
 325         set_fs(MAKE_MM_SEG(wbs));
 326
 327         switch (wbs & WBSIZ_040) {
 328         case BA_SIZE_BYTE:
 329                 res = put_user(wbd & 0xff, (char __user *)wba);
 330                 break;
 331         case BA_SIZE_WORD:
 332                 res = put_user(wbd & 0xffff, (short __user *)wba);
 333                 break;
 334         case BA_SIZE_LONG:
 335                 res = put_user(wbd, (int __user *)wba);
 336                 break;
 337         }
 338
 339         /* set_fs can not be moved, otherwise put_user() may oops */
 340         set_fs(old_fs);
 341
 342
 343 #ifdef DEBUG
 344         printk("do_040writeback1, res=%d\n",res);
 345 #endif
 346
 347         return res;
 348 }
 349
 350 /* after an exception in a writeback the stack frame corresponding
 351  * to that exception is discarded, set a few bits in the old frame
 352  * to simulate what it should look like
 353  */
 354 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 355 {
 356         fp->un.fmt7.faddr = wba;
 357         fp->un.fmt7.ssw = wbs & 0xff;
 358         if (wba != current->thread.faddr)
 359             fp->un.fmt7.ssw |= MA_040;
 360 }
 361
 362 static inline void do_040writebacks(struct frame *fp)
 363 {
 364         int res = 0;
 365 #if 0
 366         if (fp->un.fmt7.wb1s & WBV_040)
 367                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 368 #endif
 369
 370         if ((fp->un.fmt7.wb2s & WBV_040) &&
 371             !(fp->un.fmt7.wb2s & WBTT_040)) {
 372                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 373                                        fp->un.fmt7.wb2d);
 374                 if (res)
 375                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 376                 else
 377                         fp->un.fmt7.wb2s = 0;
 378         }
 379
 380         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 381         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 382                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 383                                        fp->un.fmt7.wb3d);
 384                 if (res)
 385                     {
 386                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 387
 388                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 389                         fp->un.fmt7.wb3s &= (~WBV_040);
 390                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 391                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 392                     }
 393                 else
 394                         fp->un.fmt7.wb3s = 0;
 395         }
 396
 397         if (res)
 398                 send_fault_sig(&fp->ptregs);
 399 }
 400
 401 /*
 402  * called from sigreturn(), must ensure userspace code didn't
 403  * manipulate exception frame to circumvent protection, then complete
 404  * pending writebacks
 405  * we just clear TM2 to turn it into an userspace access
 406  */
 407 asmlinkage void berr_040cleanup(struct frame *fp)
 408 {
 409         fp->un.fmt7.wb2s &= ~4;
 410         fp->un.fmt7.wb3s &= ~4;
 411
 412         do_040writebacks(fp);
 413 }
 414
 415 static inline void access_error040(struct frame *fp)
 416 {
 417         unsigned short ssw = fp->un.fmt7.ssw;
 418         unsigned long mmusr;
 419
 420 #ifdef DEBUG
 421         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 422         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 423                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 424         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 425                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 426                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 427 #endif
 428
 429         if (ssw & ATC_040) {
 430                 unsigned long addr = fp->un.fmt7.faddr;
 431                 unsigned long errorcode;
 432
 433                 /*
 434                  * The MMU status has to be determined AFTER the address
 435                  * has been corrected if there was a misaligned access (MA).
 436                  */
 437                 if (ssw & MA_040)
 438                         addr = (addr + 7) & -8;
 439
 440                 /* MMU error, get the MMUSR info for this access */
 441                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 442 #ifdef DEBUG
 443                 printk("mmusr = %lx\n", mmusr);
 444 #endif
 445                 errorcode = 1;
 446                 if (!(mmusr & MMU_R_040)) {
 447                         /* clear the invalid atc entry */
 448                         __flush_tlb040_one(addr);
 449                         errorcode = 0;
 450                 }
 451
 452                 /* despite what documentation seems to say, RMW
 453                  * accesses have always both the LK and RW bits set */
 454                 if (!(ssw & RW_040) || (ssw & LK_040))
 455                         errorcode |= 2;
 456
 457                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 458 #ifdef DEBUG
 459                         printk("do_page_fault() !=0 \n");
 460 #endif
 461                         if (user_mode(&fp->ptregs)){
 462                                 /* delay writebacks after signal delivery */
 463 #ifdef DEBUG
 464                                 printk(".. was usermode - return\n");
 465 #endif
 466                                 return;
 467                         }
 468                         /* disable writeback into user space from kernel
 469                          * (if do_page_fault didn't fix the mapping,
 470                          * the writeback won't do good)
 471                          */
 472 #ifdef DEBUG
 473                         printk(".. disabling wb2\n");
 474 #endif
 475                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 476                                 fp->un.fmt7.wb2s &= ~WBV_040;
 477                 }
 478         } else if (send_fault_sig(&fp->ptregs) > 0) {
 479                 printk("68040 access error, ssw=%x\n", ssw);
 480                 trap_c(fp);
 481         }
 482
 483         do_040writebacks(fp);
 484 }
 485 #endif /* CONFIG_M68040 */
 486
 487 #if defined(CONFIG_SUN3)
 488 #include <asm/sun3mmu.h>
 489
 490 extern int mmu_emu_handle_fault (unsigned long, int, int);
 491
 492 /* sun3 version of bus_error030 */
 493
 494 static inline void bus_error030 (struct frame *fp)
 495 {
 496         unsigned char buserr_type = sun3_get_buserr ();
 497         unsigned long addr, errorcode;
 498         unsigned short ssw = fp->un.fmtb.ssw;
 499         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 500
 501 #ifdef DEBUG
 502         if (ssw & (FC | FB))
 503                 printk ("Instruction fault at %#010lx\n",
 504                         ssw & FC ?
 505                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 506                         :
 507                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 508         if (ssw & DF)
 509                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 510                         ssw & RW ? "read" : "write",
 511                         fp->un.fmtb.daddr,
 512                         space_names[ssw & DFC], fp->ptregs.pc);
 513 #endif
 514
 515         /*
 516          * Check if this page should be demand-mapped. This needs to go before
 517          * the testing for a bad kernel-space access (demand-mapping applies
 518          * to kernel accesses too).
 519          */
 520
 521         if ((ssw & DF)
 522             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 523                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 524                         return;
 525         }
 526
 527         /* Check for kernel-space pagefault (BAD). */
 528         if (fp->ptregs.sr & PS_S) {
 529                 /* kernel fault must be a data fault to user space */
 530                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 531                      // try checking the kernel mappings before surrender
 532                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 533                           return;
 534                         /* instruction fault or kernel data fault! */
 535                         if (ssw & (FC | FB))
 536                                 printk ("Instruction fault at %#010lx\n",
 537                                         fp->ptregs.pc);
 538                         if (ssw & DF) {
 539                                 /* was this fault incurred testing bus mappings? */
 540                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 541                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 542                                         send_fault_sig(&fp->ptregs);
 543                                         return;
 544                                 }
 545
 546                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 547                                         ssw & RW ? "read" : "write",
 548                                         fp->un.fmtb.daddr,
 549                                         space_names[ssw & DFC], fp->ptregs.pc);
 550                         }
 551                         printk ("BAD KERNEL BUSERR\n");
 552
 553                         die_if_kernel("Oops", &fp->ptregs,0);
 554                         force_sig(SIGKILL, current);
 555                         return;
 556                 }
 557         } else {
 558                 /* user fault */
 559                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 560                         /* not an instruction fault or data fault! BAD */
 561                         panic ("USER BUSERR w/o instruction or data fault");
 562         }
 563
 564
 565         /* First handle the data fault, if any.  */
 566         if (ssw & DF) {
 567                 addr = fp->un.fmtb.daddr;
 568
 569 // errorcode bit 0:     0 -> no page            1 -> protection fault
 570 // errorcode bit 1:     0 -> read fault         1 -> write fault
 571
 572 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 573 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 574
 575                 if (buserr_type & SUN3_BUSERR_PROTERR)
 576                         errorcode = 0x01;
 577                 else if (buserr_type & SUN3_BUSERR_INVALID)
 578                         errorcode = 0x00;
 579                 else {
 580 #ifdef DEBUG
 581                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 582                         printk ("invalid %s access at %#lx from pc %#lx\n",
 583                                 !(ssw & RW) ? "write" : "read", addr,
 584                                 fp->ptregs.pc);
 585 #endif
 586                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 587                         force_sig (SIGBUS, current);
 588                         return;
 589                 }
 590
 591 //todo: wtf is RM bit? --m
 592                 if (!(ssw & RW) || ssw & RM)
 593                         errorcode |= 0x02;
 594
 595                 /* Handle page fault. */
 596                 do_page_fault (&fp->ptregs, addr, errorcode);
 597
 598                 /* Retry the data fault now. */
 599                 return;
 600         }
 601
 602         /* Now handle the instruction fault. */
 603
 604         /* Get the fault address. */
 605         if (fp->ptregs.format == 0xA)
 606                 addr = fp->ptregs.pc + 4;
 607         else
 608                 addr = fp->un.fmtb.baddr;
 609         if (ssw & FC)
 610                 addr -= 2;
 611
 612         if (buserr_type & SUN3_BUSERR_INVALID) {
 613                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 614                         do_page_fault (&fp->ptregs, addr, 0);
 615        } else {
 616 #ifdef DEBUG
 617                 printk ("protection fault on insn access (segv).\n");
 618 #endif
 619                 force_sig (SIGSEGV, current);
 620        }
 621 }
 622 #else
 623 #if defined(CPU_M68020_OR_M68030)
 624 static inline void bus_error030 (struct frame *fp)
 625 {
 626         volatile unsigned short temp;
 627         unsigned short mmusr;
 628         unsigned long addr, errorcode;
 629         unsigned short ssw = fp->un.fmtb.ssw;
 630 #ifdef DEBUG
 631         unsigned long desc;
 632
 633         printk ("pid = %x  ", current->pid);
 634         printk ("SSW=%#06x  ", ssw);
 635
 636         if (ssw & (FC | FB))
 637                 printk ("Instruction fault at %#010lx\n",
 638                         ssw & FC ?
 639                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 640                         :
 641                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 642         if (ssw & DF)
 643                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 644                         ssw & RW ? "read" : "write",
 645                         fp->un.fmtb.daddr,
 646                         space_names[ssw & DFC], fp->ptregs.pc);
 647 #endif
 648
 649         /* ++andreas: If a data fault and an instruction fault happen
 650            at the same time map in both pages.  */
 651
 652         /* First handle the data fault, if any.  */
 653         if (ssw & DF) {
 654                 addr = fp->un.fmtb.daddr;
 655
 656 #ifdef DEBUG
 657                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 658                               "pmove %%psr,%1@"
 659                               : "=a&" (desc)
 660                               : "a" (&temp), "a" (addr), "d" (ssw));
 661 #else
 662                 asm volatile ("ptestr %2,%1@,#7\n\t"
 663                               "pmove %%psr,%0@"
 664                               : : "a" (&temp), "a" (addr), "d" (ssw));
 665 #endif
 666                 mmusr = temp;
 667
 668 #ifdef DEBUG
 669                 printk("mmusr is %#x for addr %#lx in task %p\n",
 670                        mmusr, addr, current);
 671                 printk("descriptor address is %#lx, contents %#lx\n",
 672                        __va(desc), *(unsigned long *)__va(desc));
 673 #endif
 674
 675                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 676                 if (!(ssw & RW) || (ssw & RM))
 677                         errorcode |= 2;
 678
 679                 if (mmusr & (MMU_I | MMU_WP)) {
 680                         if (ssw & 4) {
 681                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 682                                        ssw & RW ? "read" : "write",
 683                                        fp->un.fmtb.daddr,
 684                                        space_names[ssw & DFC], fp->ptregs.pc);
 685                                 goto buserr;
 686                         }
 687                         /* Don't try to do anything further if an exception was
 688                            handled. */
 689                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 690                                 return;
 691                 } else if (!(mmusr & MMU_I)) {
 692                         /* probably a 020 cas fault */
 693                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 694                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 695                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 696                         printk("invalid %s access at %#lx from pc %#lx\n",
 697                                !(ssw & RW) ? "write" : "read", addr,
 698                                fp->ptregs.pc);
 699                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 700                         force_sig(SIGSEGV, current);
 701                         return;
 702                 } else {
 703 #if 0
 704                         static volatile long tlong;
 705 #endif
 706
 707                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 708                                !(ssw & RW) ? "write" : "read", addr,
 709                                fp->ptregs.pc, ssw);
 710                         asm volatile ("ptestr #1,%1@,#0\n\t"
 711                                       "pmove %%psr,%0@"
 712                                       : /* no outputs */
 713                                       : "a" (&temp), "a" (addr));
 714                         mmusr = temp;
 715
 716                         printk ("level 0 mmusr is %#x\n", mmusr);
 717 #if 0
 718                         asm volatile ("pmove %%tt0,%0@"
 719                                       : /* no outputs */
 720                                       : "a" (&tlong));
 721                         printk("tt0 is %#lx, ", tlong);
 722                         asm volatile ("pmove %%tt1,%0@"
 723                                       : /* no outputs */
 724                                       : "a" (&tlong));
 725                         printk("tt1 is %#lx\n", tlong);
 726 #endif
 727 #ifdef DEBUG
 728                         printk("Unknown SIGSEGV - 1\n");
 729 #endif
 730                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 731                         force_sig(SIGSEGV, current);
 732                         return;
 733                 }
 734
 735                 /* setup an ATC entry for the access about to be retried */
 736                 if (!(ssw & RW) || (ssw & RM))
 737                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 738                                       : "a" (addr), "d" (ssw));
 739                 else
 740                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 741                                       : "a" (addr), "d" (ssw));
 742         }
 743
 744         /* Now handle the instruction fault. */
 745
 746         if (!(ssw & (FC|FB)))
 747                 return;
 748
 749         if (fp->ptregs.sr & PS_S) {
 750                 printk("Instruction fault at %#010lx\n",
 751                         fp->ptregs.pc);
 752         buserr:
 753                 printk ("BAD KERNEL BUSERR\n");
 754                 die_if_kernel("Oops",&fp->ptregs,0);
 755                 force_sig(SIGKILL, current);
 756                 return;
 757         }
 758
 759         /* get the fault address */
 760         if (fp->ptregs.format == 10)
 761                 addr = fp->ptregs.pc + 4;
 762         else
 763                 addr = fp->un.fmtb.baddr;
 764         if (ssw & FC)
 765                 addr -= 2;
 766
 767         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 768                 /* Insn fault on same page as data fault.  But we
 769                    should still create the ATC entry.  */
 770                 goto create_atc_entry;
 771
 772 #ifdef DEBUG
 773         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 774                       "pmove %%psr,%1@"
 775                       : "=a&" (desc)
 776                       : "a" (&temp), "a" (addr));
 777 #else
 778         asm volatile ("ptestr #1,%1@,#7\n\t"
 779                       "pmove %%psr,%0@"
 780                       : : "a" (&temp), "a" (addr));
 781 #endif
 782         mmusr = temp;
 783
 784 #ifdef DEBUG
 785         printk ("mmusr is %#x for addr %#lx in task %p\n",
 786                 mmusr, addr, current);
 787         printk ("descriptor address is %#lx, contents %#lx\n",
 788                 __va(desc), *(unsigned long *)__va(desc));
 789 #endif
 790
 791         if (mmusr & MMU_I)
 792                 do_page_fault (&fp->ptregs, addr, 0);
 793         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 794                 printk ("invalid insn access at %#lx from pc %#lx\n",
 795                         addr, fp->ptregs.pc);
 796 #ifdef DEBUG
 797                 printk("Unknown SIGSEGV - 2\n");
 798 #endif
 799                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 800                 force_sig(SIGSEGV, current);
 801                 return;
 802         }
 803
 804 create_atc_entry:
 805         /* setup an ATC entry for the access about to be retried */
 806         asm volatile ("ploadr #2,%0@" : /* no outputs */
 807                       : "a" (addr));
 808 }
 809 #endif /* CPU_M68020_OR_M68030 */
 810 #endif /* !CONFIG_SUN3 */
 811
 812 asmlinkage void buserr_c(struct frame *fp)
 813 {
 814         /* Only set esp0 if coming from user mode */
 815         if (user_mode(&fp->ptregs))
 816                 current->thread.esp0 = (unsigned long) fp;
 817
 818 #ifdef DEBUG
 819         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 820 #endif
 821
 822         switch (fp->ptregs.format) {
 823 #if defined (CONFIG_M68060)
 824         case 4:                         /* 68060 access error */
 825           access_error060 (fp);
 826           break;
 827 #endif
 828 #if defined (CONFIG_M68040)
 829         case 0x7:                       /* 68040 access error */
 830           access_error040 (fp);
 831           break;
 832 #endif
 833 #if defined (CPU_M68020_OR_M68030)
 834         case 0xa:
 835         case 0xb:
 836           bus_error030 (fp);
 837           break;
 838 #endif
 839         default:
 840           die_if_kernel("bad frame format",&fp->ptregs,0);
 841 #ifdef DEBUG
 842           printk("Unknown SIGSEGV - 4\n");
 843 #endif
 844           force_sig(SIGSEGV, current);
 845         }
 846 }
 847
 848
 849 static int kstack_depth_to_print = 48;
 850
 851 void show_trace(unsigned long *stack)
 852 {
 853         unsigned long *endstack;
 854         unsigned long addr;
 855         int i;
 856
 857         printk("Call Trace:");
 858         addr = (unsigned long)stack + THREAD_SIZE - 1;
 859         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 860         i = 0;
 861         while (stack + 1 <= endstack) {
 862                 addr = *stack++;
 863                 /*
 864                  * If the address is either in the text segment of the
 865                  * kernel, or in the region which contains vmalloc'ed
 866                  * memory, it *may* be the address of a calling
 867                  * routine; if so, print it so that someone tracing
 868                  * down the cause of the crash will be able to figure
 869                  * out the call path that was taken.
 870                  */
 871                 if (__kernel_text_address(addr)) {
 872 #ifndef CONFIG_KALLSYMS
 873                         if (i % 5 == 0)
 874                                 printk("\n       ");
 875 #endif
 876                         printk(" [<%08lx>]", addr);
 877                         print_symbol(" %s\n", addr);
 878                         i++;
 879                 }
 880         }
 881         printk("\n");
 882 }
 883
 884 void show_registers(struct pt_regs *regs)
 885 {
 886         struct frame *fp = (struct frame *)regs;
 887         mm_segment_t old_fs = get_fs();
 888         u16 c, *cp;
 889         unsigned long addr;
 890         int i;
 891
 892         print_modules();
 893         printk("PC: [<%08lx>]",regs->pc);
 894         print_symbol(" %s", regs->pc);
 895         printk("\nSR: %04x  SP: %p  a2: %08lx\n",
 896                regs->sr, regs, regs->a2);
 897         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 898                regs->d0, regs->d1, regs->d2, regs->d3);
 899         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 900                regs->d4, regs->d5, regs->a0, regs->a1);
 901
 902         printk("Process %s (pid: %d, task=%p)\n",
 903                 current->comm, current->pid, current);
 904         addr = (unsigned long)&fp->un;
 905         printk("Frame format=%X ", regs->format);
 906         switch (regs->format) {
 907         case 0x2:
 908                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 909                 addr += sizeof(fp->un.fmt2);
 910                 break;
 911         case 0x3:
 912                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 913                 addr += sizeof(fp->un.fmt3);
 914                 break;
 915         case 0x4:
 916                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 917                         : "eff addr=%08lx pc=%08lx\n"),
 918                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 919                 addr += sizeof(fp->un.fmt4);
 920                 break;
 921         case 0x7:
 922                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 923                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 924                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 925                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 926                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 927                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 928                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 929                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 930                 printk("push data: %08lx %08lx %08lx %08lx\n",
 931                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 932                         fp->un.fmt7.pd3);
 933                 addr += sizeof(fp->un.fmt7);
 934                 break;
 935         case 0x9:
 936                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 937                 addr += sizeof(fp->un.fmt9);
 938                 break;
 939         case 0xa:
 940                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 941                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 942                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 943                 addr += sizeof(fp->un.fmta);
 944                 break;
 945         case 0xb:
 946                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 947                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 948                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 949                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 950                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 951                 addr += sizeof(fp->un.fmtb);
 952                 break;
 953         default:
 954                 printk("\n");
 955         }
 956         show_stack(NULL, (unsigned long *)addr);
 957
 958         printk("Code:");
 959         set_fs(KERNEL_DS);
 960         cp = (u16 *)regs->pc;
 961         for (i = -8; i < 16; i++) {
 962                 if (get_user(c, cp + i) && i >= 0) {
 963                         printk(" Bad PC value.");
 964                         break;
 965                 }
 966                 printk(i ? " %04x" : " <%04x>", c);
 967         }
 968         set_fs(old_fs);
 969         printk ("\n");
 970 }
 971
 972 void show_stack(struct task_struct *task, unsigned long *stack)
 973 {
 974         unsigned long *p;
 975         unsigned long *endstack;
 976         int i;
 977
 978         if (!stack) {
 979                 if (task)
 980                         stack = (unsigned long *)task->thread.esp0;
 981                 else
 982                         stack = (unsigned long *)&stack;
 983         }
 984         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 985
 986         printk("Stack from %08lx:", (unsigned long)stack);
 987         p = stack;
 988         for (i = 0; i < kstack_depth_to_print; i++) {
 989                 if (p + 1 > endstack)
 990                         break;
 991                 if (i % 8 == 0)
 992                         printk("\n       ");
 993                 printk(" %08lx", *p++);
 994         }
 995         printk("\n");
 996         show_trace(stack);
 997 }
 998
 999 /*
1000  * The architecture-independent backtrace generator
1001  */
1002 void dump_stack(void)
1003 {
1004         unsigned long stack;
1005
1006         show_trace(&stack);
1007 }
1008
1009 EXPORT_SYMBOL(dump_stack);
1010
1011 void bad_super_trap (struct frame *fp)
1012 {
1013         console_verbose();
1014         if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
1015                 printk ("*** %s ***   FORMAT=%X\n",
1016                         vec_names[(fp->ptregs.vector) >> 2],
1017                         fp->ptregs.format);
1018         else
1019                 printk ("*** Exception %d ***   FORMAT=%X\n",
1020                         (fp->ptregs.vector) >> 2,
1021                         fp->ptregs.format);
1022         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1023                 unsigned short ssw = fp->un.fmtb.ssw;
1024
1025                 printk ("SSW=%#06x  ", ssw);
1026
1027                 if (ssw & RC)
1028                         printk ("Pipe stage C instruction fault at %#010lx\n",
1029                                 (fp->ptregs.format) == 0xA ?
1030                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1031                 if (ssw & RB)
1032                         printk ("Pipe stage B instruction fault at %#010lx\n",
1033                                 (fp->ptregs.format) == 0xA ?
1034                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1035                 if (ssw & DF)
1036                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1037                                 ssw & RW ? "read" : "write",
1038                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1039                                 fp->ptregs.pc);
1040         }
1041         printk ("Current process id is %d\n", current->pid);
1042         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1043 }
1044
1045 asmlinkage void trap_c(struct frame *fp)
1046 {
1047         int sig;
1048         siginfo_t info;
1049
1050         if (fp->ptregs.sr & PS_S) {
1051                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1052                         /* traced a trapping instruction */
1053                         current->ptrace |= PT_DTRACE;
1054                 } else
1055                         bad_super_trap(fp);
1056                 return;
1057         }
1058
1059         /* send the appropriate signal to the user program */
1060         switch ((fp->ptregs.vector) >> 2) {
1061             case VEC_ADDRERR:
1062                 info.si_code = BUS_ADRALN;
1063                 sig = SIGBUS;
1064                 break;
1065             case VEC_ILLEGAL:
1066             case VEC_LINE10:
1067             case VEC_LINE11:
1068                 info.si_code = ILL_ILLOPC;
1069                 sig = SIGILL;
1070                 break;
1071             case VEC_PRIV:
1072                 info.si_code = ILL_PRVOPC;
1073                 sig = SIGILL;
1074                 break;
1075             case VEC_COPROC:
1076                 info.si_code = ILL_COPROC;
1077                 sig = SIGILL;
1078                 break;
1079             case VEC_TRAP1:
1080             case VEC_TRAP2:
1081             case VEC_TRAP3:
1082             case VEC_TRAP4:
1083             case VEC_TRAP5:
1084             case VEC_TRAP6:
1085             case VEC_TRAP7:
1086             case VEC_TRAP8:
1087             case VEC_TRAP9:
1088             case VEC_TRAP10:
1089             case VEC_TRAP11:
1090             case VEC_TRAP12:
1091             case VEC_TRAP13:
1092             case VEC_TRAP14:
1093                 info.si_code = ILL_ILLTRP;
1094                 sig = SIGILL;
1095                 break;
1096             case VEC_FPBRUC:
1097             case VEC_FPOE:
1098             case VEC_FPNAN:
1099                 info.si_code = FPE_FLTINV;
1100                 sig = SIGFPE;
1101                 break;
1102             case VEC_FPIR:
1103                 info.si_code = FPE_FLTRES;
1104                 sig = SIGFPE;
1105                 break;
1106             case VEC_FPDIVZ:
1107                 info.si_code = FPE_FLTDIV;
1108                 sig = SIGFPE;
1109                 break;
1110             case VEC_FPUNDER:
1111                 info.si_code = FPE_FLTUND;
1112                 sig = SIGFPE;
1113                 break;
1114             case VEC_FPOVER:
1115                 info.si_code = FPE_FLTOVF;
1116                 sig = SIGFPE;
1117                 break;
1118             case VEC_ZERODIV:
1119                 info.si_code = FPE_INTDIV;
1120                 sig = SIGFPE;
1121                 break;
1122             case VEC_CHK:
1123             case VEC_TRAP:
1124                 info.si_code = FPE_INTOVF;
1125                 sig = SIGFPE;
1126                 break;
1127             case VEC_TRACE:             /* ptrace single step */
1128                 info.si_code = TRAP_TRACE;
1129                 sig = SIGTRAP;
1130                 break;
1131             case VEC_TRAP15:            /* breakpoint */
1132                 info.si_code = TRAP_BRKPT;
1133                 sig = SIGTRAP;
1134                 break;
1135             default:
1136                 info.si_code = ILL_ILLOPC;
1137                 sig = SIGILL;
1138                 break;
1139         }
1140         info.si_signo = sig;
1141         info.si_errno = 0;
1142         switch (fp->ptregs.format) {
1143             default:
1144                 info.si_addr = (void *) fp->ptregs.pc;
1145                 break;
1146             case 2:
1147                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1148                 break;
1149             case 7:
1150                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1151                 break;
1152             case 9:
1153                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1154                 break;
1155             case 10:
1156                 info.si_addr = (void *) fp->un.fmta.daddr;
1157                 break;
1158             case 11:
1159                 info.si_addr = (void *) fp->un.fmtb.daddr;
1160                 break;
1161         }
1162         force_sig_info (sig, &info, current);
1163 }
1164
1165 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1166 {
1167         if (!(fp->sr & PS_S))
1168                 return;
1169
1170         console_verbose();
1171         printk("%s: %08x\n",str,nr);
1172         show_registers(fp);
1173         add_taint(TAINT_DIE);
1174         do_exit(SIGSEGV);
1175 }
1176
1177 /*
1178  * This function is called if an error occur while accessing
1179  * user-space from the fpsp040 code.
1180  */
1181 asmlinkage void fpsp040_die(void)
1182 {
1183         do_exit(SIGSEGV);
1184 }
1185
1186 #ifdef CONFIG_M68KFPU_EMU
1187 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1188 {
1189         siginfo_t info;
1190
1191         info.si_signo = signal;
1192         info.si_errno = 0;
1193         info.si_code = code;
1194         info.si_addr = addr;
1195         force_sig_info(signal, &info, current);
1196 }
1197 #endif