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