arch/m68k/kernel/traps.c

   1 /*
   2  *  linux/arch/m68k/kernel/traps.c
   3  *
   4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
   5  *
   6  *  68040 fixes by Michael Rausch
   7  *  68040 fixes by Martin Apel
   8  *  68040 fixes and writeback by Richard Zidlicky
   9  *  68060 fixes by Roman Hodek
  10  *  68060 fixes by Jesper Skov
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 /*
  18  * Sets up all exception vectors
  19  */
  20
  21 #include <linux/sched.h>
  22 #include <linux/signal.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/user.h>
  27 #include <linux/string.h>
  28 #include <linux/linkage.h>
  29 #include <linux/init.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/kallsyms.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/fpu.h>
  35 #include <asm/system.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/traps.h>
  38 #include <asm/pgalloc.h>
  39 #include <asm/machdep.h>
  40 #include <asm/siginfo.h>
  41
  42 /* assembler routines */
  43 asmlinkage void system_call(void);
  44 asmlinkage void buserr(void);
  45 asmlinkage void trap(void);
  46 asmlinkage void nmihandler(void);
  47 #ifdef CONFIG_M68KFPU_EMU
  48 asmlinkage void fpu_emu(void);
  49 #endif
  50
  51 e_vector vectors[256] = {
  52         [VEC_BUSERR]    = buserr,
  53         [VEC_SYS]       = system_call,
  54 };
  55
  56 /* nmi handler for the Amiga */
  57 asm(".text\n"
  58     __ALIGN_STR "\n"
  59     "nmihandler: rte");
  60
  61 /*
  62  * this must be called very early as the kernel might
  63  * use some instruction that are emulated on the 060
  64  */
  65 void __init base_trap_init(void)
  66 {
  67         if(MACH_IS_SUN3X) {
  68                 extern e_vector *sun3x_prom_vbr;
  69
  70                 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
  71         }
  72
  73         /* setup the exception vector table */
  74         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
  75
  76         if (CPU_IS_060) {
  77                 /* set up ISP entry points */
  78                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
  79
  80                 vectors[VEC_UNIMPII] = unimp_vec;
  81         }
  82 }
  83
  84 void __init trap_init (void)
  85 {
  86         int i;
  87
  88         for (i = VEC_SPUR; i <= VEC_INT7; i++)
  89                 vectors[i] = bad_inthandler;
  90
  91         for (i = 0; i < VEC_USER; i++)
  92                 if (!vectors[i])
  93                         vectors[i] = trap;
  94
  95         for (i = VEC_USER; i < 256; i++)
  96                 vectors[i] = bad_inthandler;
  97
  98 #ifdef CONFIG_M68KFPU_EMU
  99         if (FPU_IS_EMU)
 100                 vectors[VEC_LINE11] = fpu_emu;
 101 #endif
 102
 103         if (CPU_IS_040 && !FPU_IS_EMU) {
 104                 /* set up FPSP entry points */
 105                 asmlinkage void dz_vec(void) asm ("dz");
 106                 asmlinkage void inex_vec(void) asm ("inex");
 107                 asmlinkage void ovfl_vec(void) asm ("ovfl");
 108                 asmlinkage void unfl_vec(void) asm ("unfl");
 109                 asmlinkage void snan_vec(void) asm ("snan");
 110                 asmlinkage void operr_vec(void) asm ("operr");
 111                 asmlinkage void bsun_vec(void) asm ("bsun");
 112                 asmlinkage void fline_vec(void) asm ("fline");
 113                 asmlinkage void unsupp_vec(void) asm ("unsupp");
 114
 115                 vectors[VEC_FPDIVZ] = dz_vec;
 116                 vectors[VEC_FPIR] = inex_vec;
 117                 vectors[VEC_FPOVER] = ovfl_vec;
 118                 vectors[VEC_FPUNDER] = unfl_vec;
 119                 vectors[VEC_FPNAN] = snan_vec;
 120                 vectors[VEC_FPOE] = operr_vec;
 121                 vectors[VEC_FPBRUC] = bsun_vec;
 122                 vectors[VEC_LINE11] = fline_vec;
 123                 vectors[VEC_FPUNSUP] = unsupp_vec;
 124         }
 125
 126         if (CPU_IS_060 && !FPU_IS_EMU) {
 127                 /* set up IFPSP entry points */
 128                 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
 129                 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
 130                 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
 131                 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
 132                 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
 133                 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
 134                 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
 135                 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
 136                 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
 137
 138                 vectors[VEC_FPNAN] = snan_vec6;
 139                 vectors[VEC_FPOE] = operr_vec6;
 140                 vectors[VEC_FPOVER] = ovfl_vec6;
 141                 vectors[VEC_FPUNDER] = unfl_vec6;
 142                 vectors[VEC_FPDIVZ] = dz_vec6;
 143                 vectors[VEC_FPIR] = inex_vec6;
 144                 vectors[VEC_LINE11] = fline_vec6;
 145                 vectors[VEC_FPUNSUP] = unsupp_vec6;
 146                 vectors[VEC_UNIMPEA] = effadd_vec6;
 147         }
 148
 149         /* if running on an amiga, make the NMI interrupt do nothing */
 150         if (MACH_IS_AMIGA) {
 151                 vectors[VEC_INT7] = nmihandler;
 152         }
 153 }
 154
 155
 156 static const char *vec_names[] = {
 157         [VEC_RESETSP]   = "RESET SP",
 158         [VEC_RESETPC]   = "RESET PC",
 159         [VEC_BUSERR]    = "BUS ERROR",
 160         [VEC_ADDRERR]   = "ADDRESS ERROR",
 161         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
 162         [VEC_ZERODIV]   = "ZERO DIVIDE",
 163         [VEC_CHK]       = "CHK",
 164         [VEC_TRAP]      = "TRAPcc",
 165         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
 166         [VEC_TRACE]     = "TRACE",
 167         [VEC_LINE10]    = "LINE 1010",
 168         [VEC_LINE11]    = "LINE 1111",
 169         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
 170         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
 171         [VEC_FORMAT]    = "FORMAT ERROR",
 172         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
 173         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
 174         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
 175         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
 176         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
 177         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
 178         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
 179         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
 180         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
 181         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
 182         [VEC_INT1]      = "LEVEL 1 INT",
 183         [VEC_INT2]      = "LEVEL 2 INT",
 184         [VEC_INT3]      = "LEVEL 3 INT",
 185         [VEC_INT4]      = "LEVEL 4 INT",
 186         [VEC_INT5]      = "LEVEL 5 INT",
 187         [VEC_INT6]      = "LEVEL 6 INT",
 188         [VEC_INT7]      = "LEVEL 7 INT",
 189         [VEC_SYS]       = "SYSCALL",
 190         [VEC_TRAP1]     = "TRAP #1",
 191         [VEC_TRAP2]     = "TRAP #2",
 192         [VEC_TRAP3]     = "TRAP #3",
 193         [VEC_TRAP4]     = "TRAP #4",
 194         [VEC_TRAP5]     = "TRAP #5",
 195         [VEC_TRAP6]     = "TRAP #6",
 196         [VEC_TRAP7]     = "TRAP #7",
 197         [VEC_TRAP8]     = "TRAP #8",
 198         [VEC_TRAP9]     = "TRAP #9",
 199         [VEC_TRAP10]    = "TRAP #10",
 200         [VEC_TRAP11]    = "TRAP #11",
 201         [VEC_TRAP12]    = "TRAP #12",
 202         [VEC_TRAP13]    = "TRAP #13",
 203         [VEC_TRAP14]    = "TRAP #14",
 204         [VEC_TRAP15]    = "TRAP #15",
 205         [VEC_FPBRUC]    = "FPCP BSUN",
 206         [VEC_FPIR]      = "FPCP INEXACT",
 207         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
 208         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
 209         [VEC_FPOE]      = "FPCP OPERAND ERROR",
 210         [VEC_FPOVER]    = "FPCP OVERFLOW",
 211         [VEC_FPNAN]     = "FPCP SNAN",
 212         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
 213         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 214         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 215         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 216         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 217         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 218         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 219         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 220         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 221 };
 222
 223 static const char *space_names[] = {
 224         [0]             = "Space 0",
 225         [USER_DATA]     = "User Data",
 226         [USER_PROGRAM]  = "User Program",
 227 #ifndef CONFIG_SUN3
 228         [3]             = "Space 3",
 229 #else
 230         [FC_CONTROL]    = "Control",
 231 #endif
 232         [4]             = "Space 4",
 233         [SUPER_DATA]    = "Super Data",
 234         [SUPER_PROGRAM] = "Super Program",
 235         [CPU_SPACE]     = "CPU"
 236 };
 237
 238 void die_if_kernel(char *,struct pt_regs *,int);
 239 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 240                              unsigned long error_code);
 241 int send_fault_sig(struct pt_regs *regs);
 242
 243 asmlinkage void trap_c(struct frame *fp);
 244
 245 #if defined (CONFIG_M68060)
 246 static inline void access_error060 (struct frame *fp)
 247 {
 248         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
 249
 250 #ifdef DEBUG
 251         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 252 #endif
 253
 254         if (fslw & MMU060_BPE) {
 255                 /* branch prediction error -> clear branch cache */
 256                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 257                                       "orl   #0x00400000,%/d0\n\t"
 258                                       "movec %/d0,%/cacr"
 259                                       : : : "d0" );
 260                 /* return if there's no other error */
 261                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 262                         return;
 263         }
 264
 265         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 266                 unsigned long errorcode;
 267                 unsigned long addr = fp->un.fmt4.effaddr;
 268
 269                 if (fslw & MMU060_MA)
 270                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 271
 272                 errorcode = 1;
 273                 if (fslw & MMU060_DESC_ERR) {
 274                         __flush_tlb040_one(addr);
 275                         errorcode = 0;
 276                 }
 277                 if (fslw & MMU060_W)
 278                         errorcode |= 2;
 279 #ifdef DEBUG
 280                 printk("errorcode = %d\n", errorcode );
 281 #endif
 282                 do_page_fault(&fp->ptregs, addr, errorcode);
 283         } else if (fslw & (MMU060_SEE)){
 284                 /* Software Emulation Error.
 285                  * fault during mem_read/mem_write in ifpsp060/os.S
 286                  */
 287                 send_fault_sig(&fp->ptregs);
 288         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 289                    send_fault_sig(&fp->ptregs) > 0) {
 290                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 291                 printk( "68060 access error, fslw=%lx\n", fslw );
 292                 trap_c( fp );
 293         }
 294 }
 295 #endif /* CONFIG_M68060 */
 296
 297 #if defined (CONFIG_M68040)
 298 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 299 {
 300         unsigned long mmusr;
 301         mm_segment_t old_fs = get_fs();
 302
 303         set_fs(MAKE_MM_SEG(wbs));
 304
 305         if (iswrite)
 306                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 307         else
 308                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 309
 310         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 311
 312         set_fs(old_fs);
 313
 314         return mmusr;
 315 }
 316
 317 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 318                                    unsigned long wbd)
 319 {
 320         int res = 0;
 321         mm_segment_t old_fs = get_fs();
 322
 323         /* set_fs can not be moved, otherwise put_user() may oops */
 324         set_fs(MAKE_MM_SEG(wbs));
 325
 326         switch (wbs & WBSIZ_040) {
 327         case BA_SIZE_BYTE:
 328                 res = put_user(wbd & 0xff, (char __user *)wba);
 329                 break;
 330         case BA_SIZE_WORD:
 331                 res = put_user(wbd & 0xffff, (short __user *)wba);
 332                 break;
 333         case BA_SIZE_LONG:
 334                 res = put_user(wbd, (int __user *)wba);
 335                 break;
 336         }
 337
 338         /* set_fs can not be moved, otherwise put_user() may oops */
 339         set_fs(old_fs);
 340
 341
 342 #ifdef DEBUG
 343         printk("do_040writeback1, res=%d\n",res);
 344 #endif
 345
 346         return res;
 347 }
 348
 349 /* after an exception in a writeback the stack frame corresponding
 350  * to that exception is discarded, set a few bits in the old frame
 351  * to simulate what it should look like
 352  */
 353 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 354 {
 355         fp->un.fmt7.faddr = wba;
 356         fp->un.fmt7.ssw = wbs & 0xff;
 357         if (wba != current->thread.faddr)
 358             fp->un.fmt7.ssw |= MA_040;
 359 }
 360
 361 static inline void do_040writebacks(struct frame *fp)
 362 {
 363         int res = 0;
 364 #if 0
 365         if (fp->un.fmt7.wb1s & WBV_040)
 366                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 367 #endif
 368
 369         if ((fp->un.fmt7.wb2s & WBV_040) &&
 370             !(fp->un.fmt7.wb2s & WBTT_040)) {
 371                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 372                                        fp->un.fmt7.wb2d);
 373                 if (res)
 374                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 375                 else
 376                         fp->un.fmt7.wb2s = 0;
 377         }
 378
 379         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 380         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 381                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 382                                        fp->un.fmt7.wb3d);
 383                 if (res)
 384                     {
 385                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 386
 387                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 388                         fp->un.fmt7.wb3s &= (~WBV_040);
 389                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 390                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 391                     }
 392                 else
 393                         fp->un.fmt7.wb3s = 0;
 394         }
 395
 396         if (res)
 397                 send_fault_sig(&fp->ptregs);
 398 }
 399
 400 /*
 401  * called from sigreturn(), must ensure userspace code didn't
 402  * manipulate exception frame to circumvent protection, then complete
 403  * pending writebacks
 404  * we just clear TM2 to turn it into a userspace access
 405  */
 406 asmlinkage void berr_040cleanup(struct frame *fp)
 407 {
 408         fp->un.fmt7.wb2s &= ~4;
 409         fp->un.fmt7.wb3s &= ~4;
 410
 411         do_040writebacks(fp);
 412 }
 413
 414 static inline void access_error040(struct frame *fp)
 415 {
 416         unsigned short ssw = fp->un.fmt7.ssw;
 417         unsigned long mmusr;
 418
 419 #ifdef DEBUG
 420         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 421         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 422                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 423         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 424                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 425                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 426 #endif
 427
 428         if (ssw & ATC_040) {
 429                 unsigned long addr = fp->un.fmt7.faddr;
 430                 unsigned long errorcode;
 431
 432                 /*
 433                  * The MMU status has to be determined AFTER the address
 434                  * has been corrected if there was a misaligned access (MA).
 435                  */
 436                 if (ssw & MA_040)
 437                         addr = (addr + 7) & -8;
 438
 439                 /* MMU error, get the MMUSR info for this access */
 440                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 441 #ifdef DEBUG
 442                 printk("mmusr = %lx\n", mmusr);
 443 #endif
 444                 errorcode = 1;
 445                 if (!(mmusr & MMU_R_040)) {
 446                         /* clear the invalid atc entry */
 447                         __flush_tlb040_one(addr);
 448                         errorcode = 0;
 449                 }
 450
 451                 /* despite what documentation seems to say, RMW
 452                  * accesses have always both the LK and RW bits set */
 453                 if (!(ssw & RW_040) || (ssw & LK_040))
 454                         errorcode |= 2;
 455
 456                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 457 #ifdef DEBUG
 458                         printk("do_page_fault() !=0\n");
 459 #endif
 460                         if (user_mode(&fp->ptregs)){
 461                                 /* delay writebacks after signal delivery */
 462 #ifdef DEBUG
 463                                 printk(".. was usermode - return\n");
 464 #endif
 465                                 return;
 466                         }
 467                         /* disable writeback into user space from kernel
 468                          * (if do_page_fault didn't fix the mapping,
 469                          * the writeback won't do good)
 470                          */
 471 disable_wb:
 472 #ifdef DEBUG
 473                         printk(".. disabling wb2\n");
 474 #endif
 475                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 476                                 fp->un.fmt7.wb2s &= ~WBV_040;
 477                         if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
 478                                 fp->un.fmt7.wb3s &= ~WBV_040;
 479                 }
 480         } else {
 481                 /* In case of a bus error we either kill the process or expect
 482                  * the kernel to catch the fault, which then is also responsible
 483                  * for cleaning up the mess.
 484                  */
 485                 current->thread.signo = SIGBUS;
 486                 current->thread.faddr = fp->un.fmt7.faddr;
 487                 if (send_fault_sig(&fp->ptregs) >= 0)
 488                         printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
 489                                fp->un.fmt7.faddr);
 490                 goto disable_wb;
 491         }
 492
 493         do_040writebacks(fp);
 494 }
 495 #endif /* CONFIG_M68040 */
 496
 497 #if defined(CONFIG_SUN3)
 498 #include <asm/sun3mmu.h>
 499
 500 extern int mmu_emu_handle_fault (unsigned long, int, int);
 501
 502 /* sun3 version of bus_error030 */
 503
 504 static inline void bus_error030 (struct frame *fp)
 505 {
 506         unsigned char buserr_type = sun3_get_buserr ();
 507         unsigned long addr, errorcode;
 508         unsigned short ssw = fp->un.fmtb.ssw;
 509         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 510
 511 #ifdef DEBUG
 512         if (ssw & (FC | FB))
 513                 printk ("Instruction fault at %#010lx\n",
 514                         ssw & FC ?
 515                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 516                         :
 517                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 518         if (ssw & DF)
 519                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 520                         ssw & RW ? "read" : "write",
 521                         fp->un.fmtb.daddr,
 522                         space_names[ssw & DFC], fp->ptregs.pc);
 523 #endif
 524
 525         /*
 526          * Check if this page should be demand-mapped. This needs to go before
 527          * the testing for a bad kernel-space access (demand-mapping applies
 528          * to kernel accesses too).
 529          */
 530
 531         if ((ssw & DF)
 532             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 533                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 534                         return;
 535         }
 536
 537         /* Check for kernel-space pagefault (BAD). */
 538         if (fp->ptregs.sr & PS_S) {
 539                 /* kernel fault must be a data fault to user space */
 540                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 541                      // try checking the kernel mappings before surrender
 542                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 543                           return;
 544                         /* instruction fault or kernel data fault! */
 545                         if (ssw & (FC | FB))
 546                                 printk ("Instruction fault at %#010lx\n",
 547                                         fp->ptregs.pc);
 548                         if (ssw & DF) {
 549                                 /* was this fault incurred testing bus mappings? */
 550                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 551                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 552                                         send_fault_sig(&fp->ptregs);
 553                                         return;
 554                                 }
 555
 556                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 557                                         ssw & RW ? "read" : "write",
 558                                         fp->un.fmtb.daddr,
 559                                         space_names[ssw & DFC], fp->ptregs.pc);
 560                         }
 561                         printk ("BAD KERNEL BUSERR\n");
 562
 563                         die_if_kernel("Oops", &fp->ptregs,0);
 564                         force_sig(SIGKILL, current);
 565                         return;
 566                 }
 567         } else {
 568                 /* user fault */
 569                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 570                         /* not an instruction fault or data fault! BAD */
 571                         panic ("USER BUSERR w/o instruction or data fault");
 572         }
 573
 574
 575         /* First handle the data fault, if any.  */
 576         if (ssw & DF) {
 577                 addr = fp->un.fmtb.daddr;
 578
 579 // errorcode bit 0:     0 -> no page            1 -> protection fault
 580 // errorcode bit 1:     0 -> read fault         1 -> write fault
 581
 582 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 583 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 584
 585                 if (buserr_type & SUN3_BUSERR_PROTERR)
 586                         errorcode = 0x01;
 587                 else if (buserr_type & SUN3_BUSERR_INVALID)
 588                         errorcode = 0x00;
 589                 else {
 590 #ifdef DEBUG
 591                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 592                         printk ("invalid %s access at %#lx from pc %#lx\n",
 593                                 !(ssw & RW) ? "write" : "read", addr,
 594                                 fp->ptregs.pc);
 595 #endif
 596                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 597                         force_sig (SIGBUS, current);
 598                         return;
 599                 }
 600
 601 //todo: wtf is RM bit? --m
 602                 if (!(ssw & RW) || ssw & RM)
 603                         errorcode |= 0x02;
 604
 605                 /* Handle page fault. */
 606                 do_page_fault (&fp->ptregs, addr, errorcode);
 607
 608                 /* Retry the data fault now. */
 609                 return;
 610         }
 611
 612         /* Now handle the instruction fault. */
 613
 614         /* Get the fault address. */
 615         if (fp->ptregs.format == 0xA)
 616                 addr = fp->ptregs.pc + 4;
 617         else
 618                 addr = fp->un.fmtb.baddr;
 619         if (ssw & FC)
 620                 addr -= 2;
 621
 622         if (buserr_type & SUN3_BUSERR_INVALID) {
 623                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 624                         do_page_fault (&fp->ptregs, addr, 0);
 625        } else {
 626 #ifdef DEBUG
 627                 printk ("protection fault on insn access (segv).\n");
 628 #endif
 629                 force_sig (SIGSEGV, current);
 630        }
 631 }
 632 #else
 633 #if defined(CPU_M68020_OR_M68030)
 634 static inline void bus_error030 (struct frame *fp)
 635 {
 636         volatile unsigned short temp;
 637         unsigned short mmusr;
 638         unsigned long addr, errorcode;
 639         unsigned short ssw = fp->un.fmtb.ssw;
 640 #ifdef DEBUG
 641         unsigned long desc;
 642
 643         printk ("pid = %x  ", current->pid);
 644         printk ("SSW=%#06x  ", ssw);
 645
 646         if (ssw & (FC | FB))
 647                 printk ("Instruction fault at %#010lx\n",
 648                         ssw & FC ?
 649                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 650                         :
 651                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 652         if (ssw & DF)
 653                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 654                         ssw & RW ? "read" : "write",
 655                         fp->un.fmtb.daddr,
 656                         space_names[ssw & DFC], fp->ptregs.pc);
 657 #endif
 658
 659         /* ++andreas: If a data fault and an instruction fault happen
 660            at the same time map in both pages.  */
 661
 662         /* First handle the data fault, if any.  */
 663         if (ssw & DF) {
 664                 addr = fp->un.fmtb.daddr;
 665
 666 #ifdef DEBUG
 667                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 668                               "pmove %%psr,%1@"
 669                               : "=a&" (desc)
 670                               : "a" (&temp), "a" (addr), "d" (ssw));
 671 #else
 672                 asm volatile ("ptestr %2,%1@,#7\n\t"
 673                               "pmove %%psr,%0@"
 674                               : : "a" (&temp), "a" (addr), "d" (ssw));
 675 #endif
 676                 mmusr = temp;
 677
 678 #ifdef DEBUG
 679                 printk("mmusr is %#x for addr %#lx in task %p\n",
 680                        mmusr, addr, current);
 681                 printk("descriptor address is %#lx, contents %#lx\n",
 682                        __va(desc), *(unsigned long *)__va(desc));
 683 #endif
 684
 685                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 686                 if (!(ssw & RW) || (ssw & RM))
 687                         errorcode |= 2;
 688
 689                 if (mmusr & (MMU_I | MMU_WP)) {
 690                         if (ssw & 4) {
 691                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 692                                        ssw & RW ? "read" : "write",
 693                                        fp->un.fmtb.daddr,
 694                                        space_names[ssw & DFC], fp->ptregs.pc);
 695                                 goto buserr;
 696                         }
 697                         /* Don't try to do anything further if an exception was
 698                            handled. */
 699                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 700                                 return;
 701                 } else if (!(mmusr & MMU_I)) {
 702                         /* probably a 020 cas fault */
 703                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 704                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 705                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 706                         printk("invalid %s access at %#lx from pc %#lx\n",
 707                                !(ssw & RW) ? "write" : "read", addr,
 708                                fp->ptregs.pc);
 709                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 710                         force_sig(SIGSEGV, current);
 711                         return;
 712                 } else {
 713 #if 0
 714                         static volatile long tlong;
 715 #endif
 716
 717                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 718                                !(ssw & RW) ? "write" : "read", addr,
 719                                fp->ptregs.pc, ssw);
 720                         asm volatile ("ptestr #1,%1@,#0\n\t"
 721                                       "pmove %%psr,%0@"
 722                                       : /* no outputs */
 723                                       : "a" (&temp), "a" (addr));
 724                         mmusr = temp;
 725
 726                         printk ("level 0 mmusr is %#x\n", mmusr);
 727 #if 0
 728                         asm volatile ("pmove %%tt0,%0@"
 729                                       : /* no outputs */
 730                                       : "a" (&tlong));
 731                         printk("tt0 is %#lx, ", tlong);
 732                         asm volatile ("pmove %%tt1,%0@"
 733                                       : /* no outputs */
 734                                       : "a" (&tlong));
 735                         printk("tt1 is %#lx\n", tlong);
 736 #endif
 737 #ifdef DEBUG
 738                         printk("Unknown SIGSEGV - 1\n");
 739 #endif
 740                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 741                         force_sig(SIGSEGV, current);
 742                         return;
 743                 }
 744
 745                 /* setup an ATC entry for the access about to be retried */
 746                 if (!(ssw & RW) || (ssw & RM))
 747                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 748                                       : "a" (addr), "d" (ssw));
 749                 else
 750                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 751                                       : "a" (addr), "d" (ssw));
 752         }
 753
 754         /* Now handle the instruction fault. */
 755
 756         if (!(ssw & (FC|FB)))
 757                 return;
 758
 759         if (fp->ptregs.sr & PS_S) {
 760                 printk("Instruction fault at %#010lx\n",
 761                         fp->ptregs.pc);
 762         buserr:
 763                 printk ("BAD KERNEL BUSERR\n");
 764                 die_if_kernel("Oops",&fp->ptregs,0);
 765                 force_sig(SIGKILL, current);
 766                 return;
 767         }
 768
 769         /* get the fault address */
 770         if (fp->ptregs.format == 10)
 771                 addr = fp->ptregs.pc + 4;
 772         else
 773                 addr = fp->un.fmtb.baddr;
 774         if (ssw & FC)
 775                 addr -= 2;
 776
 777         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 778                 /* Insn fault on same page as data fault.  But we
 779                    should still create the ATC entry.  */
 780                 goto create_atc_entry;
 781
 782 #ifdef DEBUG
 783         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 784                       "pmove %%psr,%1@"
 785                       : "=a&" (desc)
 786                       : "a" (&temp), "a" (addr));
 787 #else
 788         asm volatile ("ptestr #1,%1@,#7\n\t"
 789                       "pmove %%psr,%0@"
 790                       : : "a" (&temp), "a" (addr));
 791 #endif
 792         mmusr = temp;
 793
 794 #ifdef DEBUG
 795         printk ("mmusr is %#x for addr %#lx in task %p\n",
 796                 mmusr, addr, current);
 797         printk ("descriptor address is %#lx, contents %#lx\n",
 798                 __va(desc), *(unsigned long *)__va(desc));
 799 #endif
 800
 801         if (mmusr & MMU_I)
 802                 do_page_fault (&fp->ptregs, addr, 0);
 803         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 804                 printk ("invalid insn access at %#lx from pc %#lx\n",
 805                         addr, fp->ptregs.pc);
 806 #ifdef DEBUG
 807                 printk("Unknown SIGSEGV - 2\n");
 808 #endif
 809                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 810                 force_sig(SIGSEGV, current);
 811                 return;
 812         }
 813
 814 create_atc_entry:
 815         /* setup an ATC entry for the access about to be retried */
 816         asm volatile ("ploadr #2,%0@" : /* no outputs */
 817                       : "a" (addr));
 818 }
 819 #endif /* CPU_M68020_OR_M68030 */
 820 #endif /* !CONFIG_SUN3 */
 821
 822 asmlinkage void buserr_c(struct frame *fp)
 823 {
 824         /* Only set esp0 if coming from user mode */
 825         if (user_mode(&fp->ptregs))
 826                 current->thread.esp0 = (unsigned long) fp;
 827
 828 #ifdef DEBUG
 829         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 830 #endif
 831
 832         switch (fp->ptregs.format) {
 833 #if defined (CONFIG_M68060)
 834         case 4:                         /* 68060 access error */
 835           access_error060 (fp);
 836           break;
 837 #endif
 838 #if defined (CONFIG_M68040)
 839         case 0x7:                       /* 68040 access error */
 840           access_error040 (fp);
 841           break;
 842 #endif
 843 #if defined (CPU_M68020_OR_M68030)
 844         case 0xa:
 845         case 0xb:
 846           bus_error030 (fp);
 847           break;
 848 #endif
 849         default:
 850           die_if_kernel("bad frame format",&fp->ptregs,0);
 851 #ifdef DEBUG
 852           printk("Unknown SIGSEGV - 4\n");
 853 #endif
 854           force_sig(SIGSEGV, current);
 855         }
 856 }
 857
 858
 859 static int kstack_depth_to_print = 48;
 860
 861 void show_trace(unsigned long *stack)
 862 {
 863         unsigned long *endstack;
 864         unsigned long addr;
 865         int i;
 866
 867         printk("Call Trace:");
 868         addr = (unsigned long)stack + THREAD_SIZE - 1;
 869         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 870         i = 0;
 871         while (stack + 1 <= endstack) {
 872                 addr = *stack++;
 873                 /*
 874                  * If the address is either in the text segment of the
 875                  * kernel, or in the region which contains vmalloc'ed
 876                  * memory, it *may* be the address of a calling
 877                  * routine; if so, print it so that someone tracing
 878                  * down the cause of the crash will be able to figure
 879                  * out the call path that was taken.
 880                  */
 881                 if (__kernel_text_address(addr)) {
 882 #ifndef CONFIG_KALLSYMS
 883                         if (i % 5 == 0)
 884                                 printk("\n       ");
 885 #endif
 886                         printk(" [<%08lx>] %pS\n", addr, (void *)addr);
 887                         i++;
 888                 }
 889         }
 890         printk("\n");
 891 }
 892
 893 void show_registers(struct pt_regs *regs)
 894 {
 895         struct frame *fp = (struct frame *)regs;
 896         mm_segment_t old_fs = get_fs();
 897         u16 c, *cp;
 898         unsigned long addr;
 899         int i;
 900
 901         print_modules();
 902         printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
 903         printk("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
 904         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 905                regs->d0, regs->d1, regs->d2, regs->d3);
 906         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 907                regs->d4, regs->d5, regs->a0, regs->a1);
 908
 909         printk("Process %s (pid: %d, task=%p)\n",
 910                 current->comm, task_pid_nr(current), current);
 911         addr = (unsigned long)&fp->un;
 912         printk("Frame format=%X ", regs->format);
 913         switch (regs->format) {
 914         case 0x2:
 915                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 916                 addr += sizeof(fp->un.fmt2);
 917                 break;
 918         case 0x3:
 919                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 920                 addr += sizeof(fp->un.fmt3);
 921                 break;
 922         case 0x4:
 923                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 924                         : "eff addr=%08lx pc=%08lx\n"),
 925                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 926                 addr += sizeof(fp->un.fmt4);
 927                 break;
 928         case 0x7:
 929                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 930                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 931                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 932                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 933                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 934                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 935                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 936                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 937                 printk("push data: %08lx %08lx %08lx %08lx\n",
 938                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 939                         fp->un.fmt7.pd3);
 940                 addr += sizeof(fp->un.fmt7);
 941                 break;
 942         case 0x9:
 943                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 944                 addr += sizeof(fp->un.fmt9);
 945                 break;
 946         case 0xa:
 947                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 948                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 949                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 950                 addr += sizeof(fp->un.fmta);
 951                 break;
 952         case 0xb:
 953                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 954                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 955                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 956                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 957                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 958                 addr += sizeof(fp->un.fmtb);
 959                 break;
 960         default:
 961                 printk("\n");
 962         }
 963         show_stack(NULL, (unsigned long *)addr);
 964
 965         printk("Code:");
 966         set_fs(KERNEL_DS);
 967         cp = (u16 *)regs->pc;
 968         for (i = -8; i < 16; i++) {
 969                 if (get_user(c, cp + i) && i >= 0) {
 970                         printk(" Bad PC value.");
 971                         break;
 972                 }
 973                 printk(i ? " %04x" : " <%04x>", c);
 974         }
 975         set_fs(old_fs);
 976         printk ("\n");
 977 }
 978
 979 void show_stack(struct task_struct *task, unsigned long *stack)
 980 {
 981         unsigned long *p;
 982         unsigned long *endstack;
 983         int i;
 984
 985         if (!stack) {
 986                 if (task)
 987                         stack = (unsigned long *)task->thread.esp0;
 988                 else
 989                         stack = (unsigned long *)&stack;
 990         }
 991         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 992
 993         printk("Stack from %08lx:", (unsigned long)stack);
 994         p = stack;
 995         for (i = 0; i < kstack_depth_to_print; i++) {
 996                 if (p + 1 > endstack)
 997                         break;
 998                 if (i % 8 == 0)
 999                         printk("\n       ");
1000                 printk(" %08lx", *p++);
1001         }
1002         printk("\n");
1003         show_trace(stack);
1004 }
1005
1006 /*
1007  * The architecture-independent backtrace generator
1008  */
1009 void dump_stack(void)
1010 {
1011         unsigned long stack;
1012
1013         show_trace(&stack);
1014 }
1015
1016 EXPORT_SYMBOL(dump_stack);
1017
1018 void bad_super_trap (struct frame *fp)
1019 {
1020         console_verbose();
1021         if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
1022                 printk ("*** %s ***   FORMAT=%X\n",
1023                         vec_names[(fp->ptregs.vector) >> 2],
1024                         fp->ptregs.format);
1025         else
1026                 printk ("*** Exception %d ***   FORMAT=%X\n",
1027                         (fp->ptregs.vector) >> 2,
1028                         fp->ptregs.format);
1029         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1030                 unsigned short ssw = fp->un.fmtb.ssw;
1031
1032                 printk ("SSW=%#06x  ", ssw);
1033
1034                 if (ssw & RC)
1035                         printk ("Pipe stage C instruction fault at %#010lx\n",
1036                                 (fp->ptregs.format) == 0xA ?
1037                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1038                 if (ssw & RB)
1039                         printk ("Pipe stage B instruction fault at %#010lx\n",
1040                                 (fp->ptregs.format) == 0xA ?
1041                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1042                 if (ssw & DF)
1043                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1044                                 ssw & RW ? "read" : "write",
1045                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1046                                 fp->ptregs.pc);
1047         }
1048         printk ("Current process id is %d\n", task_pid_nr(current));
1049         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1050 }
1051
1052 asmlinkage void trap_c(struct frame *fp)
1053 {
1054         int sig;
1055         siginfo_t info;
1056
1057         if (fp->ptregs.sr & PS_S) {
1058                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1059                         /* traced a trapping instruction */
1060                 } else
1061                         bad_super_trap(fp);
1062                 return;
1063         }
1064
1065         /* send the appropriate signal to the user program */
1066         switch ((fp->ptregs.vector) >> 2) {
1067             case VEC_ADDRERR:
1068                 info.si_code = BUS_ADRALN;
1069                 sig = SIGBUS;
1070                 break;
1071             case VEC_ILLEGAL:
1072             case VEC_LINE10:
1073             case VEC_LINE11:
1074                 info.si_code = ILL_ILLOPC;
1075                 sig = SIGILL;
1076                 break;
1077             case VEC_PRIV:
1078                 info.si_code = ILL_PRVOPC;
1079                 sig = SIGILL;
1080                 break;
1081             case VEC_COPROC:
1082                 info.si_code = ILL_COPROC;
1083                 sig = SIGILL;
1084                 break;
1085             case VEC_TRAP1:
1086             case VEC_TRAP2:
1087             case VEC_TRAP3:
1088             case VEC_TRAP4:
1089             case VEC_TRAP5:
1090             case VEC_TRAP6:
1091             case VEC_TRAP7:
1092             case VEC_TRAP8:
1093             case VEC_TRAP9:
1094             case VEC_TRAP10:
1095             case VEC_TRAP11:
1096             case VEC_TRAP12:
1097             case VEC_TRAP13:
1098             case VEC_TRAP14:
1099                 info.si_code = ILL_ILLTRP;
1100                 sig = SIGILL;
1101                 break;
1102             case VEC_FPBRUC:
1103             case VEC_FPOE:
1104             case VEC_FPNAN:
1105                 info.si_code = FPE_FLTINV;
1106                 sig = SIGFPE;
1107                 break;
1108             case VEC_FPIR:
1109                 info.si_code = FPE_FLTRES;
1110                 sig = SIGFPE;
1111                 break;
1112             case VEC_FPDIVZ:
1113                 info.si_code = FPE_FLTDIV;
1114                 sig = SIGFPE;
1115                 break;
1116             case VEC_FPUNDER:
1117                 info.si_code = FPE_FLTUND;
1118                 sig = SIGFPE;
1119                 break;
1120             case VEC_FPOVER:
1121                 info.si_code = FPE_FLTOVF;
1122                 sig = SIGFPE;
1123                 break;
1124             case VEC_ZERODIV:
1125                 info.si_code = FPE_INTDIV;
1126                 sig = SIGFPE;
1127                 break;
1128             case VEC_CHK:
1129             case VEC_TRAP:
1130                 info.si_code = FPE_INTOVF;
1131                 sig = SIGFPE;
1132                 break;
1133             case VEC_TRACE:             /* ptrace single step */
1134                 info.si_code = TRAP_TRACE;
1135                 sig = SIGTRAP;
1136                 break;
1137             case VEC_TRAP15:            /* breakpoint */
1138                 info.si_code = TRAP_BRKPT;
1139                 sig = SIGTRAP;
1140                 break;
1141             default:
1142                 info.si_code = ILL_ILLOPC;
1143                 sig = SIGILL;
1144                 break;
1145         }
1146         info.si_signo = sig;
1147         info.si_errno = 0;
1148         switch (fp->ptregs.format) {
1149             default:
1150                 info.si_addr = (void *) fp->ptregs.pc;
1151                 break;
1152             case 2:
1153                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1154                 break;
1155             case 7:
1156                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1157                 break;
1158             case 9:
1159                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1160                 break;
1161             case 10:
1162                 info.si_addr = (void *) fp->un.fmta.daddr;
1163                 break;
1164             case 11:
1165                 info.si_addr = (void *) fp->un.fmtb.daddr;
1166                 break;
1167         }
1168         force_sig_info (sig, &info, current);
1169 }
1170
1171 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1172 {
1173         if (!(fp->sr & PS_S))
1174                 return;
1175
1176         console_verbose();
1177         printk("%s: %08x\n",str,nr);
1178         show_registers(fp);
1179         add_taint(TAINT_DIE);
1180         do_exit(SIGSEGV);
1181 }
1182
1183 /*
1184  * This function is called if an error occur while accessing
1185  * user-space from the fpsp040 code.
1186  */
1187 asmlinkage void fpsp040_die(void)
1188 {
1189         do_exit(SIGSEGV);
1190 }
1191
1192 #ifdef CONFIG_M68KFPU_EMU
1193 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1194 {
1195         siginfo_t info;
1196
1197         info.si_signo = signal;
1198         info.si_errno = 0;
1199         info.si_code = code;
1200         info.si_addr = addr;
1201         force_sig_info(signal, &info, current);
1202 }
1203 #endif