err.no Git - linux-2.6/blob - arch/m68k/kernel/traps.c

   1 /*
   2  *  linux/arch/m68k/kernel/traps.c
   3  *
   4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
   5  *
   6  *  68040 fixes by Michael Rausch
   7  *  68040 fixes by Martin Apel
   8  *  68040 fixes and writeback by Richard Zidlicky
   9  *  68060 fixes by Roman Hodek
  10  *  68060 fixes by Jesper Skov
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 /*
  18  * Sets up all exception vectors
  19  */
  20
  21 #include <linux/config.h>
  22 #include <linux/sched.h>
  23 #include <linux/signal.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/module.h>
  27 #include <linux/a.out.h>
  28 #include <linux/user.h>
  29 #include <linux/string.h>
  30 #include <linux/linkage.h>
  31 #include <linux/init.h>
  32 #include <linux/ptrace.h>
  33 #include <linux/kallsyms.h>
  34
  35 #include <asm/setup.h>
  36 #include <asm/fpu.h>
  37 #include <asm/system.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/traps.h>
  40 #include <asm/pgalloc.h>
  41 #include <asm/machdep.h>
  42 #include <asm/siginfo.h>
  43
  44 /* assembler routines */
  45 asmlinkage void system_call(void);
  46 asmlinkage void buserr(void);
  47 asmlinkage void trap(void);
  48 asmlinkage void nmihandler(void);
  49 #ifdef CONFIG_M68KFPU_EMU
  50 asmlinkage void fpu_emu(void);
  51 #endif
  52
  53 e_vector vectors[256] = {
  54         [VEC_BUSERR]    = buserr,
  55         [VEC_SYS]       = system_call,
  56 };
  57
  58 /* nmi handler for the Amiga */
  59 asm(".text\n"
  60     __ALIGN_STR "\n"
  61     "nmihandler: rte");
  62
  63 /*
  64  * this must be called very early as the kernel might
  65  * use some instruction that are emulated on the 060
  66  */
  67 void __init base_trap_init(void)
  68 {
  69         if(MACH_IS_SUN3X) {
  70                 extern e_vector *sun3x_prom_vbr;
  71
  72                 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
  73         }
  74
  75         /* setup the exception vector table */
  76         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
  77
  78         if (CPU_IS_060) {
  79                 /* set up ISP entry points */
  80                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
  81
  82                 vectors[VEC_UNIMPII] = unimp_vec;
  83         }
  84 }
  85
  86 void __init trap_init (void)
  87 {
  88         int i;
  89
  90         vectors[VEC_SPUR] = bad_inthandler;
  91         for (i = VEC_INT1; i <= VEC_INT7; i++)
  92                 vectors[i] = auto_inthandler;
  93
  94         for (i = 0; i < VEC_USER; i++)
  95                 if (!vectors[i])
  96                         vectors[i] = trap;
  97
  98         for (i = VEC_USER; i < 256; i++)
  99                 vectors[i] = mach_inthandler;
 100
 101 #ifdef CONFIG_M68KFPU_EMU
 102         if (FPU_IS_EMU)
 103                 vectors[VEC_LINE11] = fpu_emu;
 104 #endif
 105
 106         if (CPU_IS_040 && !FPU_IS_EMU) {
 107                 /* set up FPSP entry points */
 108                 asmlinkage void dz_vec(void) asm ("dz");
 109                 asmlinkage void inex_vec(void) asm ("inex");
 110                 asmlinkage void ovfl_vec(void) asm ("ovfl");
 111                 asmlinkage void unfl_vec(void) asm ("unfl");
 112                 asmlinkage void snan_vec(void) asm ("snan");
 113                 asmlinkage void operr_vec(void) asm ("operr");
 114                 asmlinkage void bsun_vec(void) asm ("bsun");
 115                 asmlinkage void fline_vec(void) asm ("fline");
 116                 asmlinkage void unsupp_vec(void) asm ("unsupp");
 117
 118                 vectors[VEC_FPDIVZ] = dz_vec;
 119                 vectors[VEC_FPIR] = inex_vec;
 120                 vectors[VEC_FPOVER] = ovfl_vec;
 121                 vectors[VEC_FPUNDER] = unfl_vec;
 122                 vectors[VEC_FPNAN] = snan_vec;
 123                 vectors[VEC_FPOE] = operr_vec;
 124                 vectors[VEC_FPBRUC] = bsun_vec;
 125                 vectors[VEC_LINE11] = fline_vec;
 126                 vectors[VEC_FPUNSUP] = unsupp_vec;
 127         }
 128
 129         if (CPU_IS_060 && !FPU_IS_EMU) {
 130                 /* set up IFPSP entry points */
 131                 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
 132                 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
 133                 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
 134                 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
 135                 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
 136                 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
 137                 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
 138                 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
 139                 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
 140
 141                 vectors[VEC_FPNAN] = snan_vec6;
 142                 vectors[VEC_FPOE] = operr_vec6;
 143                 vectors[VEC_FPOVER] = ovfl_vec6;
 144                 vectors[VEC_FPUNDER] = unfl_vec6;
 145                 vectors[VEC_FPDIVZ] = dz_vec6;
 146                 vectors[VEC_FPIR] = inex_vec6;
 147                 vectors[VEC_LINE11] = fline_vec6;
 148                 vectors[VEC_FPUNSUP] = unsupp_vec6;
 149                 vectors[VEC_UNIMPEA] = effadd_vec6;
 150         }
 151
 152         /* if running on an amiga, make the NMI interrupt do nothing */
 153         if (MACH_IS_AMIGA) {
 154                 vectors[VEC_INT7] = nmihandler;
 155         }
 156 }
 157
 158
 159 static const char *vec_names[] = {
 160         [VEC_RESETSP]   = "RESET SP",
 161         [VEC_RESETPC]   = "RESET PC",
 162         [VEC_BUSERR]    = "BUS ERROR",
 163         [VEC_ADDRERR]   = "ADDRESS ERROR",
 164         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
 165         [VEC_ZERODIV]   = "ZERO DIVIDE",
 166         [VEC_CHK]       = "CHK",
 167         [VEC_TRAP]      = "TRAPcc",
 168         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
 169         [VEC_TRACE]     = "TRACE",
 170         [VEC_LINE10]    = "LINE 1010",
 171         [VEC_LINE11]    = "LINE 1111",
 172         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
 173         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
 174         [VEC_FORMAT]    = "FORMAT ERROR",
 175         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
 176         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
 177         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
 178         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
 179         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
 180         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
 181         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
 182         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
 183         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
 184         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
 185         [VEC_INT1]      = "LEVEL 1 INT",
 186         [VEC_INT2]      = "LEVEL 2 INT",
 187         [VEC_INT3]      = "LEVEL 3 INT",
 188         [VEC_INT4]      = "LEVEL 4 INT",
 189         [VEC_INT5]      = "LEVEL 5 INT",
 190         [VEC_INT6]      = "LEVEL 6 INT",
 191         [VEC_INT7]      = "LEVEL 7 INT",
 192         [VEC_SYS]       = "SYSCALL",
 193         [VEC_TRAP1]     = "TRAP #1",
 194         [VEC_TRAP2]     = "TRAP #2",
 195         [VEC_TRAP3]     = "TRAP #3",
 196         [VEC_TRAP4]     = "TRAP #4",
 197         [VEC_TRAP5]     = "TRAP #5",
 198         [VEC_TRAP6]     = "TRAP #6",
 199         [VEC_TRAP7]     = "TRAP #7",
 200         [VEC_TRAP8]     = "TRAP #8",
 201         [VEC_TRAP9]     = "TRAP #9",
 202         [VEC_TRAP10]    = "TRAP #10",
 203         [VEC_TRAP11]    = "TRAP #11",
 204         [VEC_TRAP12]    = "TRAP #12",
 205         [VEC_TRAP13]    = "TRAP #13",
 206         [VEC_TRAP14]    = "TRAP #14",
 207         [VEC_TRAP15]    = "TRAP #15",
 208         [VEC_FPBRUC]    = "FPCP BSUN",
 209         [VEC_FPIR]      = "FPCP INEXACT",
 210         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
 211         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
 212         [VEC_FPOE]      = "FPCP OPERAND ERROR",
 213         [VEC_FPOVER]    = "FPCP OVERFLOW",
 214         [VEC_FPNAN]     = "FPCP SNAN",
 215         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
 216         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 217         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 218         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 219         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 220         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 221         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 222         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 223         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 224 };
 225
 226 static const char *space_names[] = {
 227         [0]             = "Space 0",
 228         [USER_DATA]     = "User Data",
 229         [USER_PROGRAM]  = "User Program",
 230 #ifndef CONFIG_SUN3
 231         [3]             = "Space 3",
 232 #else
 233         [FC_CONTROL]    = "Control",
 234 #endif
 235         [4]             = "Space 4",
 236         [SUPER_DATA]    = "Super Data",
 237         [SUPER_PROGRAM] = "Super Program",
 238         [CPU_SPACE]     = "CPU"
 239 };
 240
 241 void die_if_kernel(char *,struct pt_regs *,int);
 242 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 243                              unsigned long error_code);
 244 int send_fault_sig(struct pt_regs *regs);
 245
 246 asmlinkage void trap_c(struct frame *fp);
 247
 248 #if defined (CONFIG_M68060)
 249 static inline void access_error060 (struct frame *fp)
 250 {
 251         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
 252
 253 #ifdef DEBUG
 254         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 255 #endif
 256
 257         if (fslw & MMU060_BPE) {
 258                 /* branch prediction error -> clear branch cache */
 259                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 260                                       "orl   #0x00400000,%/d0\n\t"
 261                                       "movec %/d0,%/cacr"
 262                                       : : : "d0" );
 263                 /* return if there's no other error */
 264                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 265                         return;
 266         }
 267
 268         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 269                 unsigned long errorcode;
 270                 unsigned long addr = fp->un.fmt4.effaddr;
 271
 272                 if (fslw & MMU060_MA)
 273                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 274
 275                 errorcode = 1;
 276                 if (fslw & MMU060_DESC_ERR) {
 277                         __flush_tlb040_one(addr);
 278                         errorcode = 0;
 279                 }
 280                 if (fslw & MMU060_W)
 281                         errorcode |= 2;
 282 #ifdef DEBUG
 283                 printk("errorcode = %d\n", errorcode );
 284 #endif
 285                 do_page_fault(&fp->ptregs, addr, errorcode);
 286         } else if (fslw & (MMU060_SEE)){
 287                 /* Software Emulation Error.
 288                  * fault during mem_read/mem_write in ifpsp060/os.S
 289                  */
 290                 send_fault_sig(&fp->ptregs);
 291         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 292                    send_fault_sig(&fp->ptregs) > 0) {
 293                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 294                 printk( "68060 access error, fslw=%lx\n", fslw );
 295                 trap_c( fp );
 296         }
 297 }
 298 #endif /* CONFIG_M68060 */
 299
 300 #if defined (CONFIG_M68040)
 301 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 302 {
 303         unsigned long mmusr;
 304         mm_segment_t old_fs = get_fs();
 305
 306         set_fs(MAKE_MM_SEG(wbs));
 307
 308         if (iswrite)
 309                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 310         else
 311                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 312
 313         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 314
 315         set_fs(old_fs);
 316
 317         return mmusr;
 318 }
 319
 320 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 321                                    unsigned long wbd)
 322 {
 323         int res = 0;
 324         mm_segment_t old_fs = get_fs();
 325
 326         /* set_fs can not be moved, otherwise put_user() may oops */
 327         set_fs(MAKE_MM_SEG(wbs));
 328
 329         switch (wbs & WBSIZ_040) {
 330         case BA_SIZE_BYTE:
 331                 res = put_user(wbd & 0xff, (char *)wba);
 332                 break;
 333         case BA_SIZE_WORD:
 334                 res = put_user(wbd & 0xffff, (short *)wba);
 335                 break;
 336         case BA_SIZE_LONG:
 337                 res = put_user(wbd, (int *)wba);
 338                 break;
 339         }
 340
 341         /* set_fs can not be moved, otherwise put_user() may oops */
 342         set_fs(old_fs);
 343
 344
 345 #ifdef DEBUG
 346         printk("do_040writeback1, res=%d\n",res);
 347 #endif
 348
 349         return res;
 350 }
 351
 352 /* after an exception in a writeback the stack frame corresponding
 353  * to that exception is discarded, set a few bits in the old frame
 354  * to simulate what it should look like
 355  */
 356 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 357 {
 358         fp->un.fmt7.faddr = wba;
 359         fp->un.fmt7.ssw = wbs & 0xff;
 360         if (wba != current->thread.faddr)
 361             fp->un.fmt7.ssw |= MA_040;
 362 }
 363
 364 static inline void do_040writebacks(struct frame *fp)
 365 {
 366         int res = 0;
 367 #if 0
 368         if (fp->un.fmt7.wb1s & WBV_040)
 369                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 370 #endif
 371
 372         if ((fp->un.fmt7.wb2s & WBV_040) &&
 373             !(fp->un.fmt7.wb2s & WBTT_040)) {
 374                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 375                                        fp->un.fmt7.wb2d);
 376                 if (res)
 377                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 378                 else
 379                         fp->un.fmt7.wb2s = 0;
 380         }
 381
 382         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 383         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 384                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 385                                        fp->un.fmt7.wb3d);
 386                 if (res)
 387                     {
 388                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 389
 390                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 391                         fp->un.fmt7.wb3s &= (~WBV_040);
 392                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 393                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 394                     }
 395                 else
 396                         fp->un.fmt7.wb3s = 0;
 397         }
 398
 399         if (res)
 400                 send_fault_sig(&fp->ptregs);
 401 }
 402
 403 /*
 404  * called from sigreturn(), must ensure userspace code didn't
 405  * manipulate exception frame to circumvent protection, then complete
 406  * pending writebacks
 407  * we just clear TM2 to turn it into an userspace access
 408  */
 409 asmlinkage void berr_040cleanup(struct frame *fp)
 410 {
 411         fp->un.fmt7.wb2s &= ~4;
 412         fp->un.fmt7.wb3s &= ~4;
 413
 414         do_040writebacks(fp);
 415 }
 416
 417 static inline void access_error040(struct frame *fp)
 418 {
 419         unsigned short ssw = fp->un.fmt7.ssw;
 420         unsigned long mmusr;
 421
 422 #ifdef DEBUG
 423         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 424         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 425                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 426         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 427                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 428                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 429 #endif
 430
 431         if (ssw & ATC_040) {
 432                 unsigned long addr = fp->un.fmt7.faddr;
 433                 unsigned long errorcode;
 434
 435                 /*
 436                  * The MMU status has to be determined AFTER the address
 437                  * has been corrected if there was a misaligned access (MA).
 438                  */
 439                 if (ssw & MA_040)
 440                         addr = (addr + 7) & -8;
 441
 442                 /* MMU error, get the MMUSR info for this access */
 443                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 444 #ifdef DEBUG
 445                 printk("mmusr = %lx\n", mmusr);
 446 #endif
 447                 errorcode = 1;
 448                 if (!(mmusr & MMU_R_040)) {
 449                         /* clear the invalid atc entry */
 450                         __flush_tlb040_one(addr);
 451                         errorcode = 0;
 452                 }
 453
 454                 /* despite what documentation seems to say, RMW
 455                  * accesses have always both the LK and RW bits set */
 456                 if (!(ssw & RW_040) || (ssw & LK_040))
 457                         errorcode |= 2;
 458
 459                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 460 #ifdef DEBUG
 461                         printk("do_page_fault() !=0 \n");
 462 #endif
 463                         if (user_mode(&fp->ptregs)){
 464                                 /* delay writebacks after signal delivery */
 465 #ifdef DEBUG
 466                                 printk(".. was usermode - return\n");
 467 #endif
 468                                 return;
 469                         }
 470                         /* disable writeback into user space from kernel
 471                          * (if do_page_fault didn't fix the mapping,
 472                          * the writeback won't do good)
 473                          */
 474 #ifdef DEBUG
 475                         printk(".. disabling wb2\n");
 476 #endif
 477                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 478                                 fp->un.fmt7.wb2s &= ~WBV_040;
 479                 }
 480         } else if (send_fault_sig(&fp->ptregs) > 0) {
 481                 printk("68040 access error, ssw=%x\n", ssw);
 482                 trap_c(fp);
 483         }
 484
 485         do_040writebacks(fp);
 486 }
 487 #endif /* CONFIG_M68040 */
 488
 489 #if defined(CONFIG_SUN3)
 490 #include <asm/sun3mmu.h>
 491
 492 extern int mmu_emu_handle_fault (unsigned long, int, int);
 493
 494 /* sun3 version of bus_error030 */
 495
 496 static inline void bus_error030 (struct frame *fp)
 497 {
 498         unsigned char buserr_type = sun3_get_buserr ();
 499         unsigned long addr, errorcode;
 500         unsigned short ssw = fp->un.fmtb.ssw;
 501         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 502
 503 #ifdef DEBUG
 504         if (ssw & (FC | FB))
 505                 printk ("Instruction fault at %#010lx\n",
 506                         ssw & FC ?
 507                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 508                         :
 509                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 510         if (ssw & DF)
 511                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 512                         ssw & RW ? "read" : "write",
 513                         fp->un.fmtb.daddr,
 514                         space_names[ssw & DFC], fp->ptregs.pc);
 515 #endif
 516
 517         /*
 518          * Check if this page should be demand-mapped. This needs to go before
 519          * the testing for a bad kernel-space access (demand-mapping applies
 520          * to kernel accesses too).
 521          */
 522
 523         if ((ssw & DF)
 524             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 525                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 526                         return;
 527         }
 528
 529         /* Check for kernel-space pagefault (BAD). */
 530         if (fp->ptregs.sr & PS_S) {
 531                 /* kernel fault must be a data fault to user space */
 532                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 533                      // try checking the kernel mappings before surrender
 534                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 535                           return;
 536                         /* instruction fault or kernel data fault! */
 537                         if (ssw & (FC | FB))
 538                                 printk ("Instruction fault at %#010lx\n",
 539                                         fp->ptregs.pc);
 540                         if (ssw & DF) {
 541                                 /* was this fault incurred testing bus mappings? */
 542                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 543                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 544                                         send_fault_sig(&fp->ptregs);
 545                                         return;
 546                                 }
 547
 548                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 549                                         ssw & RW ? "read" : "write",
 550                                         fp->un.fmtb.daddr,
 551                                         space_names[ssw & DFC], fp->ptregs.pc);
 552                         }
 553                         printk ("BAD KERNEL BUSERR\n");
 554
 555                         die_if_kernel("Oops", &fp->ptregs,0);
 556                         force_sig(SIGKILL, current);
 557                         return;
 558                 }
 559         } else {
 560                 /* user fault */
 561                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 562                         /* not an instruction fault or data fault! BAD */
 563                         panic ("USER BUSERR w/o instruction or data fault");
 564         }
 565
 566
 567         /* First handle the data fault, if any.  */
 568         if (ssw & DF) {
 569                 addr = fp->un.fmtb.daddr;
 570
 571 // errorcode bit 0:     0 -> no page            1 -> protection fault
 572 // errorcode bit 1:     0 -> read fault         1 -> write fault
 573
 574 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 575 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 576
 577                 if (buserr_type & SUN3_BUSERR_PROTERR)
 578                         errorcode = 0x01;
 579                 else if (buserr_type & SUN3_BUSERR_INVALID)
 580                         errorcode = 0x00;
 581                 else {
 582 #ifdef DEBUG
 583                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 584                         printk ("invalid %s access at %#lx from pc %#lx\n",
 585                                 !(ssw & RW) ? "write" : "read", addr,
 586                                 fp->ptregs.pc);
 587 #endif
 588                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 589                         force_sig (SIGBUS, current);
 590                         return;
 591                 }
 592
 593 //todo: wtf is RM bit? --m
 594                 if (!(ssw & RW) || ssw & RM)
 595                         errorcode |= 0x02;
 596
 597                 /* Handle page fault. */
 598                 do_page_fault (&fp->ptregs, addr, errorcode);
 599
 600                 /* Retry the data fault now. */
 601                 return;
 602         }
 603
 604         /* Now handle the instruction fault. */
 605
 606         /* Get the fault address. */
 607         if (fp->ptregs.format == 0xA)
 608                 addr = fp->ptregs.pc + 4;
 609         else
 610                 addr = fp->un.fmtb.baddr;
 611         if (ssw & FC)
 612                 addr -= 2;
 613
 614         if (buserr_type & SUN3_BUSERR_INVALID) {
 615                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 616                         do_page_fault (&fp->ptregs, addr, 0);
 617        } else {
 618 #ifdef DEBUG
 619                 printk ("protection fault on insn access (segv).\n");
 620 #endif
 621                 force_sig (SIGSEGV, current);
 622        }
 623 }
 624 #else
 625 #if defined(CPU_M68020_OR_M68030)
 626 static inline void bus_error030 (struct frame *fp)
 627 {
 628         volatile unsigned short temp;
 629         unsigned short mmusr;
 630         unsigned long addr, errorcode;
 631         unsigned short ssw = fp->un.fmtb.ssw;
 632 #ifdef DEBUG
 633         unsigned long desc;
 634
 635         printk ("pid = %x  ", current->pid);
 636         printk ("SSW=%#06x  ", ssw);
 637
 638         if (ssw & (FC | FB))
 639                 printk ("Instruction fault at %#010lx\n",
 640                         ssw & FC ?
 641                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 642                         :
 643                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 644         if (ssw & DF)
 645                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 646                         ssw & RW ? "read" : "write",
 647                         fp->un.fmtb.daddr,
 648                         space_names[ssw & DFC], fp->ptregs.pc);
 649 #endif
 650
 651         /* ++andreas: If a data fault and an instruction fault happen
 652            at the same time map in both pages.  */
 653
 654         /* First handle the data fault, if any.  */
 655         if (ssw & DF) {
 656                 addr = fp->un.fmtb.daddr;
 657
 658 #ifdef DEBUG
 659                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 660                               "pmove %%psr,%1@"
 661                               : "=a&" (desc)
 662                               : "a" (&temp), "a" (addr), "d" (ssw));
 663 #else
 664                 asm volatile ("ptestr %2,%1@,#7\n\t"
 665                               "pmove %%psr,%0@"
 666                               : : "a" (&temp), "a" (addr), "d" (ssw));
 667 #endif
 668                 mmusr = temp;
 669
 670 #ifdef DEBUG
 671                 printk("mmusr is %#x for addr %#lx in task %p\n",
 672                        mmusr, addr, current);
 673                 printk("descriptor address is %#lx, contents %#lx\n",
 674                        __va(desc), *(unsigned long *)__va(desc));
 675 #endif
 676
 677                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 678                 if (!(ssw & RW) || (ssw & RM))
 679                         errorcode |= 2;
 680
 681                 if (mmusr & (MMU_I | MMU_WP)) {
 682                         if (ssw & 4) {
 683                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 684                                        ssw & RW ? "read" : "write",
 685                                        fp->un.fmtb.daddr,
 686                                        space_names[ssw & DFC], fp->ptregs.pc);
 687                                 goto buserr;
 688                         }
 689                         /* Don't try to do anything further if an exception was
 690                            handled. */
 691                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 692                                 return;
 693                 } else if (!(mmusr & MMU_I)) {
 694                         /* probably a 020 cas fault */
 695                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 696                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 697                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 698                         printk("invalid %s access at %#lx from pc %#lx\n",
 699                                !(ssw & RW) ? "write" : "read", addr,
 700                                fp->ptregs.pc);
 701                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 702                         force_sig(SIGSEGV, current);
 703                         return;
 704                 } else {
 705 #if 0
 706                         static volatile long tlong;
 707 #endif
 708
 709                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 710                                !(ssw & RW) ? "write" : "read", addr,
 711                                fp->ptregs.pc, ssw);
 712                         asm volatile ("ptestr #1,%1@,#0\n\t"
 713                                       "pmove %%psr,%0@"
 714                                       : /* no outputs */
 715                                       : "a" (&temp), "a" (addr));
 716                         mmusr = temp;
 717
 718                         printk ("level 0 mmusr is %#x\n", mmusr);
 719 #if 0
 720                         asm volatile ("pmove %%tt0,%0@"
 721                                       : /* no outputs */
 722                                       : "a" (&tlong));
 723                         printk("tt0 is %#lx, ", tlong);
 724                         asm volatile ("pmove %%tt1,%0@"
 725                                       : /* no outputs */
 726                                       : "a" (&tlong));
 727                         printk("tt1 is %#lx\n", tlong);
 728 #endif
 729 #ifdef DEBUG
 730                         printk("Unknown SIGSEGV - 1\n");
 731 #endif
 732                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 733                         force_sig(SIGSEGV, current);
 734                         return;
 735                 }
 736
 737                 /* setup an ATC entry for the access about to be retried */
 738                 if (!(ssw & RW) || (ssw & RM))
 739                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 740                                       : "a" (addr), "d" (ssw));
 741                 else
 742                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 743                                       : "a" (addr), "d" (ssw));
 744         }
 745
 746         /* Now handle the instruction fault. */
 747
 748         if (!(ssw & (FC|FB)))
 749                 return;
 750
 751         if (fp->ptregs.sr & PS_S) {
 752                 printk("Instruction fault at %#010lx\n",
 753                         fp->ptregs.pc);
 754         buserr:
 755                 printk ("BAD KERNEL BUSERR\n");
 756                 die_if_kernel("Oops",&fp->ptregs,0);
 757                 force_sig(SIGKILL, current);
 758                 return;
 759         }
 760
 761         /* get the fault address */
 762         if (fp->ptregs.format == 10)
 763                 addr = fp->ptregs.pc + 4;
 764         else
 765                 addr = fp->un.fmtb.baddr;
 766         if (ssw & FC)
 767                 addr -= 2;
 768
 769         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 770                 /* Insn fault on same page as data fault.  But we
 771                    should still create the ATC entry.  */
 772                 goto create_atc_entry;
 773
 774 #ifdef DEBUG
 775         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 776                       "pmove %%psr,%1@"
 777                       : "=a&" (desc)
 778                       : "a" (&temp), "a" (addr));
 779 #else
 780         asm volatile ("ptestr #1,%1@,#7\n\t"
 781                       "pmove %%psr,%0@"
 782                       : : "a" (&temp), "a" (addr));
 783 #endif
 784         mmusr = temp;
 785
 786 #ifdef DEBUG
 787         printk ("mmusr is %#x for addr %#lx in task %p\n",
 788                 mmusr, addr, current);
 789         printk ("descriptor address is %#lx, contents %#lx\n",
 790                 __va(desc), *(unsigned long *)__va(desc));
 791 #endif
 792
 793         if (mmusr & MMU_I)
 794                 do_page_fault (&fp->ptregs, addr, 0);
 795         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 796                 printk ("invalid insn access at %#lx from pc %#lx\n",
 797                         addr, fp->ptregs.pc);
 798 #ifdef DEBUG
 799                 printk("Unknown SIGSEGV - 2\n");
 800 #endif
 801                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 802                 force_sig(SIGSEGV, current);
 803                 return;
 804         }
 805
 806 create_atc_entry:
 807         /* setup an ATC entry for the access about to be retried */
 808         asm volatile ("ploadr #2,%0@" : /* no outputs */
 809                       : "a" (addr));
 810 }
 811 #endif /* CPU_M68020_OR_M68030 */
 812 #endif /* !CONFIG_SUN3 */
 813
 814 asmlinkage void buserr_c(struct frame *fp)
 815 {
 816         /* Only set esp0 if coming from user mode */
 817         if (user_mode(&fp->ptregs))
 818                 current->thread.esp0 = (unsigned long) fp;
 819
 820 #ifdef DEBUG
 821         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 822 #endif
 823
 824         switch (fp->ptregs.format) {
 825 #if defined (CONFIG_M68060)
 826         case 4:                         /* 68060 access error */
 827           access_error060 (fp);
 828           break;
 829 #endif
 830 #if defined (CONFIG_M68040)
 831         case 0x7:                       /* 68040 access error */
 832           access_error040 (fp);
 833           break;
 834 #endif
 835 #if defined (CPU_M68020_OR_M68030)
 836         case 0xa:
 837         case 0xb:
 838           bus_error030 (fp);
 839           break;
 840 #endif
 841         default:
 842           die_if_kernel("bad frame format",&fp->ptregs,0);
 843 #ifdef DEBUG
 844           printk("Unknown SIGSEGV - 4\n");
 845 #endif
 846           force_sig(SIGSEGV, current);
 847         }
 848 }
 849
 850
 851 static int kstack_depth_to_print = 48;
 852
 853 void show_trace(unsigned long *stack)
 854 {
 855         unsigned long *endstack;
 856         unsigned long addr;
 857         int i;
 858
 859         printk("Call Trace:");
 860         addr = (unsigned long)stack + THREAD_SIZE - 1;
 861         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 862         i = 0;
 863         while (stack + 1 <= endstack) {
 864                 addr = *stack++;
 865                 /*
 866                  * If the address is either in the text segment of the
 867                  * kernel, or in the region which contains vmalloc'ed
 868                  * memory, it *may* be the address of a calling
 869                  * routine; if so, print it so that someone tracing
 870                  * down the cause of the crash will be able to figure
 871                  * out the call path that was taken.
 872                  */
 873                 if (__kernel_text_address(addr)) {
 874 #ifndef CONFIG_KALLSYMS
 875                         if (i % 5 == 0)
 876                                 printk("\n       ");
 877 #endif
 878                         printk(" [<%08lx>]", addr);
 879                         print_symbol(" %s\n", addr);
 880                         i++;
 881                 }
 882         }
 883         printk("\n");
 884 }
 885
 886 void show_registers(struct pt_regs *regs)
 887 {
 888         struct frame *fp = (struct frame *)regs;
 889         mm_segment_t old_fs = get_fs();
 890         u16 c, *cp;
 891         unsigned long addr;
 892         int i;
 893
 894         print_modules();
 895         printk("PC: [<%08lx>]",regs->pc);
 896         print_symbol(" %s", regs->pc);
 897         printk("\nSR: %04x  SP: %p  a2: %08lx\n",
 898                regs->sr, regs, regs->a2);
 899         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 900                regs->d0, regs->d1, regs->d2, regs->d3);
 901         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 902                regs->d4, regs->d5, regs->a0, regs->a1);
 903
 904         printk("Process %s (pid: %d, task=%p)\n",
 905                 current->comm, current->pid, current);
 906         addr = (unsigned long)&fp->un;
 907         printk("Frame format=%X ", regs->format);
 908         switch (regs->format) {
 909         case 0x2:
 910                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 911                 addr += sizeof(fp->un.fmt2);
 912                 break;
 913         case 0x3:
 914                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 915                 addr += sizeof(fp->un.fmt3);
 916                 break;
 917         case 0x4:
 918                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 919                         : "eff addr=%08lx pc=%08lx\n"),
 920                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 921                 addr += sizeof(fp->un.fmt4);
 922                 break;
 923         case 0x7:
 924                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 925                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 926                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 927                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 928                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 929                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 930                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 931                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 932                 printk("push data: %08lx %08lx %08lx %08lx\n",
 933                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 934                         fp->un.fmt7.pd3);
 935                 addr += sizeof(fp->un.fmt7);
 936                 break;
 937         case 0x9:
 938                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 939                 addr += sizeof(fp->un.fmt9);
 940                 break;
 941         case 0xa:
 942                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 943                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 944                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 945                 addr += sizeof(fp->un.fmta);
 946                 break;
 947         case 0xb:
 948                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 949                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 950                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 951                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 952                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 953                 addr += sizeof(fp->un.fmtb);
 954                 break;
 955         default:
 956                 printk("\n");
 957         }
 958         show_stack(NULL, (unsigned long *)addr);
 959
 960         printk("Code:");
 961         set_fs(KERNEL_DS);
 962         cp = (u16 *)regs->pc;
 963         for (i = -8; i < 16; i++) {
 964                 if (get_user(c, cp + i) && i >= 0) {
 965                         printk(" Bad PC value.");
 966                         break;
 967                 }
 968                 printk(i ? " %04x" : " <%04x>", c);
 969         }
 970         set_fs(old_fs);
 971         printk ("\n");
 972 }
 973
 974 void show_stack(struct task_struct *task, unsigned long *stack)
 975 {
 976         unsigned long *p;
 977         unsigned long *endstack;
 978         int i;
 979
 980         if (!stack) {
 981                 if (task)
 982                         stack = (unsigned long *)task->thread.esp0;
 983                 else
 984                         stack = (unsigned long *)&stack;
 985         }
 986         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 987
 988         printk("Stack from %08lx:", (unsigned long)stack);
 989         p = stack;
 990         for (i = 0; i < kstack_depth_to_print; i++) {
 991                 if (p + 1 > endstack)
 992                         break;
 993                 if (i % 8 == 0)
 994                         printk("\n       ");
 995                 printk(" %08lx", *p++);
 996         }
 997         printk("\n");
 998         show_trace(stack);
 999 }
1000
1001 /*
1002  * The architecture-independent backtrace generator
1003  */
1004 void dump_stack(void)
1005 {
1006         unsigned long stack;
1007
1008         show_trace(&stack);
1009 }
1010
1011 EXPORT_SYMBOL(dump_stack);
1012
1013 void bad_super_trap (struct frame *fp)
1014 {
1015         console_verbose();
1016         if (fp->ptregs.vector < 4*sizeof(vec_names)/sizeof(vec_names[0]))
1017                 printk ("*** %s ***   FORMAT=%X\n",
1018                         vec_names[(fp->ptregs.vector) >> 2],
1019                         fp->ptregs.format);
1020         else
1021                 printk ("*** Exception %d ***   FORMAT=%X\n",
1022                         (fp->ptregs.vector) >> 2,
1023                         fp->ptregs.format);
1024         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1025                 unsigned short ssw = fp->un.fmtb.ssw;
1026
1027                 printk ("SSW=%#06x  ", ssw);
1028
1029                 if (ssw & RC)
1030                         printk ("Pipe stage C instruction fault at %#010lx\n",
1031                                 (fp->ptregs.format) == 0xA ?
1032                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1033                 if (ssw & RB)
1034                         printk ("Pipe stage B instruction fault at %#010lx\n",
1035                                 (fp->ptregs.format) == 0xA ?
1036                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1037                 if (ssw & DF)
1038                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1039                                 ssw & RW ? "read" : "write",
1040                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1041                                 fp->ptregs.pc);
1042         }
1043         printk ("Current process id is %d\n", current->pid);
1044         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1045 }
1046
1047 asmlinkage void trap_c(struct frame *fp)
1048 {
1049         int sig;
1050         siginfo_t info;
1051
1052         if (fp->ptregs.sr & PS_S) {
1053                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1054                         /* traced a trapping instruction */
1055                         current->ptrace |= PT_DTRACE;
1056                 } else
1057                         bad_super_trap(fp);
1058                 return;
1059         }
1060
1061         /* send the appropriate signal to the user program */
1062         switch ((fp->ptregs.vector) >> 2) {
1063             case VEC_ADDRERR:
1064                 info.si_code = BUS_ADRALN;
1065                 sig = SIGBUS;
1066                 break;
1067             case VEC_ILLEGAL:
1068             case VEC_LINE10:
1069             case VEC_LINE11:
1070                 info.si_code = ILL_ILLOPC;
1071                 sig = SIGILL;
1072                 break;
1073             case VEC_PRIV:
1074                 info.si_code = ILL_PRVOPC;
1075                 sig = SIGILL;
1076                 break;
1077             case VEC_COPROC:
1078                 info.si_code = ILL_COPROC;
1079                 sig = SIGILL;
1080                 break;
1081             case VEC_TRAP1:
1082             case VEC_TRAP2:
1083             case VEC_TRAP3:
1084             case VEC_TRAP4:
1085             case VEC_TRAP5:
1086             case VEC_TRAP6:
1087             case VEC_TRAP7:
1088             case VEC_TRAP8:
1089             case VEC_TRAP9:
1090             case VEC_TRAP10:
1091             case VEC_TRAP11:
1092             case VEC_TRAP12:
1093             case VEC_TRAP13:
1094             case VEC_TRAP14:
1095                 info.si_code = ILL_ILLTRP;
1096                 sig = SIGILL;
1097                 break;
1098             case VEC_FPBRUC:
1099             case VEC_FPOE:
1100             case VEC_FPNAN:
1101                 info.si_code = FPE_FLTINV;
1102                 sig = SIGFPE;
1103                 break;
1104             case VEC_FPIR:
1105                 info.si_code = FPE_FLTRES;
1106                 sig = SIGFPE;
1107                 break;
1108             case VEC_FPDIVZ:
1109                 info.si_code = FPE_FLTDIV;
1110                 sig = SIGFPE;
1111                 break;
1112             case VEC_FPUNDER:
1113                 info.si_code = FPE_FLTUND;
1114                 sig = SIGFPE;
1115                 break;
1116             case VEC_FPOVER:
1117                 info.si_code = FPE_FLTOVF;
1118                 sig = SIGFPE;
1119                 break;
1120             case VEC_ZERODIV:
1121                 info.si_code = FPE_INTDIV;
1122                 sig = SIGFPE;
1123                 break;
1124             case VEC_CHK:
1125             case VEC_TRAP:
1126                 info.si_code = FPE_INTOVF;
1127                 sig = SIGFPE;
1128                 break;
1129             case VEC_TRACE:             /* ptrace single step */
1130                 info.si_code = TRAP_TRACE;
1131                 sig = SIGTRAP;
1132                 break;
1133             case VEC_TRAP15:            /* breakpoint */
1134                 info.si_code = TRAP_BRKPT;
1135                 sig = SIGTRAP;
1136                 break;
1137             default:
1138                 info.si_code = ILL_ILLOPC;
1139                 sig = SIGILL;
1140                 break;
1141         }
1142         info.si_signo = sig;
1143         info.si_errno = 0;
1144         switch (fp->ptregs.format) {
1145             default:
1146                 info.si_addr = (void *) fp->ptregs.pc;
1147                 break;
1148             case 2:
1149                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1150                 break;
1151             case 7:
1152                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1153                 break;
1154             case 9:
1155                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1156                 break;
1157             case 10:
1158                 info.si_addr = (void *) fp->un.fmta.daddr;
1159                 break;
1160             case 11:
1161                 info.si_addr = (void *) fp->un.fmtb.daddr;
1162                 break;
1163         }
1164         force_sig_info (sig, &info, current);
1165 }
1166
1167 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1168 {
1169         if (!(fp->sr & PS_S))
1170                 return;
1171
1172         console_verbose();
1173         printk("%s: %08x\n",str,nr);
1174         show_registers(fp);
1175         do_exit(SIGSEGV);
1176 }
1177
1178 /*
1179  * This function is called if an error occur while accessing
1180  * user-space from the fpsp040 code.
1181  */
1182 asmlinkage void fpsp040_die(void)
1183 {
1184         do_exit(SIGSEGV);
1185 }
1186
1187 #ifdef CONFIG_M68KFPU_EMU
1188 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1189 {
1190         siginfo_t info;
1191
1192         info.si_signo = signal;
1193         info.si_errno = 0;
1194         info.si_code = code;
1195         info.si_addr = addr;
1196         force_sig_info(signal, &info, current);
1197 }
1198 #endif