arch/m68k/kernel/traps_mm.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
  53 /* nmi handler for the Amiga */
  54 asm(".text\n"
  55     __ALIGN_STR "\n"
  56     "nmihandler: rte");
  57
  58 /*
  59  * this must be called very early as the kernel might
  60  * use some instruction that are emulated on the 060
  61  * and so we're prepared for early probe attempts (e.g. nf_init).
  62  */
  63 void __init base_trap_init(void)
  64 {
  65         if (MACH_IS_SUN3X) {
  66                 extern e_vector *sun3x_prom_vbr;
  67
  68                 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
  69         }
  70
  71         /* setup the exception vector table */
  72         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
  73
  74         if (CPU_IS_060) {
  75                 /* set up ISP entry points */
  76                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
  77
  78                 vectors[VEC_UNIMPII] = unimp_vec;
  79         }
  80
  81         vectors[VEC_BUSERR] = buserr;
  82         vectors[VEC_ILLEGAL] = trap;
  83         vectors[VEC_SYS] = system_call;
  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 __user *)wba);
 331                 break;
 332         case BA_SIZE_WORD:
 333                 res = put_user(wbd & 0xffff, (short __user *)wba);
 334                 break;
 335         case BA_SIZE_LONG:
 336                 res = put_user(wbd, (int __user *)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 a 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 disable_wb:
 474 #ifdef DEBUG
 475                         printk(".. disabling wb2\n");
 476 #endif
 477                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 478                                 fp->un.fmt7.wb2s &= ~WBV_040;
 479                         if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
 480                                 fp->un.fmt7.wb3s &= ~WBV_040;
 481                 }
 482         } else {
 483                 /* In case of a bus error we either kill the process or expect
 484                  * the kernel to catch the fault, which then is also responsible
 485                  * for cleaning up the mess.
 486                  */
 487                 current->thread.signo = SIGBUS;
 488                 current->thread.faddr = fp->un.fmt7.faddr;
 489                 if (send_fault_sig(&fp->ptregs) >= 0)
 490                         printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
 491                                fp->un.fmt7.faddr);
 492                 goto disable_wb;
 493         }
 494
 495         do_040writebacks(fp);
 496 }
 497 #endif /* CONFIG_M68040 */
 498
 499 #if defined(CONFIG_SUN3)
 500 #include <asm/sun3mmu.h>
 501
 502 extern int mmu_emu_handle_fault (unsigned long, int, int);
 503
 504 /* sun3 version of bus_error030 */
 505
 506 static inline void bus_error030 (struct frame *fp)
 507 {
 508         unsigned char buserr_type = sun3_get_buserr ();
 509         unsigned long addr, errorcode;
 510         unsigned short ssw = fp->un.fmtb.ssw;
 511         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 512
 513 #ifdef DEBUG
 514         if (ssw & (FC | FB))
 515                 printk ("Instruction fault at %#010lx\n",
 516                         ssw & FC ?
 517                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 518                         :
 519                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 520         if (ssw & DF)
 521                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 522                         ssw & RW ? "read" : "write",
 523                         fp->un.fmtb.daddr,
 524                         space_names[ssw & DFC], fp->ptregs.pc);
 525 #endif
 526
 527         /*
 528          * Check if this page should be demand-mapped. This needs to go before
 529          * the testing for a bad kernel-space access (demand-mapping applies
 530          * to kernel accesses too).
 531          */
 532
 533         if ((ssw & DF)
 534             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 535                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 536                         return;
 537         }
 538
 539         /* Check for kernel-space pagefault (BAD). */
 540         if (fp->ptregs.sr & PS_S) {
 541                 /* kernel fault must be a data fault to user space */
 542                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 543                      // try checking the kernel mappings before surrender
 544                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 545                           return;
 546                         /* instruction fault or kernel data fault! */
 547                         if (ssw & (FC | FB))
 548                                 printk ("Instruction fault at %#010lx\n",
 549                                         fp->ptregs.pc);
 550                         if (ssw & DF) {
 551                                 /* was this fault incurred testing bus mappings? */
 552                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 553                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 554                                         send_fault_sig(&fp->ptregs);
 555                                         return;
 556                                 }
 557
 558                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 559                                         ssw & RW ? "read" : "write",
 560                                         fp->un.fmtb.daddr,
 561                                         space_names[ssw & DFC], fp->ptregs.pc);
 562                         }
 563                         printk ("BAD KERNEL BUSERR\n");
 564
 565                         die_if_kernel("Oops", &fp->ptregs,0);
 566                         force_sig(SIGKILL, current);
 567                         return;
 568                 }
 569         } else {
 570                 /* user fault */
 571                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 572                         /* not an instruction fault or data fault! BAD */
 573                         panic ("USER BUSERR w/o instruction or data fault");
 574         }
 575
 576
 577         /* First handle the data fault, if any.  */
 578         if (ssw & DF) {
 579                 addr = fp->un.fmtb.daddr;
 580
 581 // errorcode bit 0:     0 -> no page            1 -> protection fault
 582 // errorcode bit 1:     0 -> read fault         1 -> write fault
 583
 584 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 585 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 586
 587                 if (buserr_type & SUN3_BUSERR_PROTERR)
 588                         errorcode = 0x01;
 589                 else if (buserr_type & SUN3_BUSERR_INVALID)
 590                         errorcode = 0x00;
 591                 else {
 592 #ifdef DEBUG
 593                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 594                         printk ("invalid %s access at %#lx from pc %#lx\n",
 595                                 !(ssw & RW) ? "write" : "read", addr,
 596                                 fp->ptregs.pc);
 597 #endif
 598                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 599                         force_sig (SIGBUS, current);
 600                         return;
 601                 }
 602
 603 //todo: wtf is RM bit? --m
 604                 if (!(ssw & RW) || ssw & RM)
 605                         errorcode |= 0x02;
 606
 607                 /* Handle page fault. */
 608                 do_page_fault (&fp->ptregs, addr, errorcode);
 609
 610                 /* Retry the data fault now. */
 611                 return;
 612         }
 613
 614         /* Now handle the instruction fault. */
 615
 616         /* Get the fault address. */
 617         if (fp->ptregs.format == 0xA)
 618                 addr = fp->ptregs.pc + 4;
 619         else
 620                 addr = fp->un.fmtb.baddr;
 621         if (ssw & FC)
 622                 addr -= 2;
 623
 624         if (buserr_type & SUN3_BUSERR_INVALID) {
 625                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 626                         do_page_fault (&fp->ptregs, addr, 0);
 627        } else {
 628 #ifdef DEBUG
 629                 printk ("protection fault on insn access (segv).\n");
 630 #endif
 631                 force_sig (SIGSEGV, current);
 632        }
 633 }
 634 #else
 635 #if defined(CPU_M68020_OR_M68030)
 636 static inline void bus_error030 (struct frame *fp)
 637 {
 638         volatile unsigned short temp;
 639         unsigned short mmusr;
 640         unsigned long addr, errorcode;
 641         unsigned short ssw = fp->un.fmtb.ssw;
 642 #ifdef DEBUG
 643         unsigned long desc;
 644
 645         printk ("pid = %x  ", current->pid);
 646         printk ("SSW=%#06x  ", ssw);
 647
 648         if (ssw & (FC | FB))
 649                 printk ("Instruction fault at %#010lx\n",
 650                         ssw & FC ?
 651                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 652                         :
 653                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 654         if (ssw & DF)
 655                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 656                         ssw & RW ? "read" : "write",
 657                         fp->un.fmtb.daddr,
 658                         space_names[ssw & DFC], fp->ptregs.pc);
 659 #endif
 660
 661         /* ++andreas: If a data fault and an instruction fault happen
 662            at the same time map in both pages.  */
 663
 664         /* First handle the data fault, if any.  */
 665         if (ssw & DF) {
 666                 addr = fp->un.fmtb.daddr;
 667
 668 #ifdef DEBUG
 669                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 670                               "pmove %%psr,%1@"
 671                               : "=a&" (desc)
 672                               : "a" (&temp), "a" (addr), "d" (ssw));
 673 #else
 674                 asm volatile ("ptestr %2,%1@,#7\n\t"
 675                               "pmove %%psr,%0@"
 676                               : : "a" (&temp), "a" (addr), "d" (ssw));
 677 #endif
 678                 mmusr = temp;
 679
 680 #ifdef DEBUG
 681                 printk("mmusr is %#x for addr %#lx in task %p\n",
 682                        mmusr, addr, current);
 683                 printk("descriptor address is %#lx, contents %#lx\n",
 684                        __va(desc), *(unsigned long *)__va(desc));
 685 #endif
 686
 687                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 688                 if (!(ssw & RW) || (ssw & RM))
 689                         errorcode |= 2;
 690
 691                 if (mmusr & (MMU_I | MMU_WP)) {
 692                         if (ssw & 4) {
 693                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 694                                        ssw & RW ? "read" : "write",
 695                                        fp->un.fmtb.daddr,
 696                                        space_names[ssw & DFC], fp->ptregs.pc);
 697                                 goto buserr;
 698                         }
 699                         /* Don't try to do anything further if an exception was
 700                            handled. */
 701                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 702                                 return;
 703                 } else if (!(mmusr & MMU_I)) {
 704                         /* probably a 020 cas fault */
 705                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 706                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 707                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 708                         printk("invalid %s access at %#lx from pc %#lx\n",
 709                                !(ssw & RW) ? "write" : "read", addr,
 710                                fp->ptregs.pc);
 711                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 712                         force_sig(SIGSEGV, current);
 713                         return;
 714                 } else {
 715 #if 0
 716                         static volatile long tlong;
 717 #endif
 718
 719                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 720                                !(ssw & RW) ? "write" : "read", addr,
 721                                fp->ptregs.pc, ssw);
 722                         asm volatile ("ptestr #1,%1@,#0\n\t"
 723                                       "pmove %%psr,%0@"
 724                                       : /* no outputs */
 725                                       : "a" (&temp), "a" (addr));
 726                         mmusr = temp;
 727
 728                         printk ("level 0 mmusr is %#x\n", mmusr);
 729 #if 0
 730                         asm volatile ("pmove %%tt0,%0@"
 731                                       : /* no outputs */
 732                                       : "a" (&tlong));
 733                         printk("tt0 is %#lx, ", tlong);
 734                         asm volatile ("pmove %%tt1,%0@"
 735                                       : /* no outputs */
 736                                       : "a" (&tlong));
 737                         printk("tt1 is %#lx\n", tlong);
 738 #endif
 739 #ifdef DEBUG
 740                         printk("Unknown SIGSEGV - 1\n");
 741 #endif
 742                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 743                         force_sig(SIGSEGV, current);
 744                         return;
 745                 }
 746
 747                 /* setup an ATC entry for the access about to be retried */
 748                 if (!(ssw & RW) || (ssw & RM))
 749                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 750                                       : "a" (addr), "d" (ssw));
 751                 else
 752                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 753                                       : "a" (addr), "d" (ssw));
 754         }
 755
 756         /* Now handle the instruction fault. */
 757
 758         if (!(ssw & (FC|FB)))
 759                 return;
 760
 761         if (fp->ptregs.sr & PS_S) {
 762                 printk("Instruction fault at %#010lx\n",
 763                         fp->ptregs.pc);
 764         buserr:
 765                 printk ("BAD KERNEL BUSERR\n");
 766                 die_if_kernel("Oops",&fp->ptregs,0);
 767                 force_sig(SIGKILL, current);
 768                 return;
 769         }
 770
 771         /* get the fault address */
 772         if (fp->ptregs.format == 10)
 773                 addr = fp->ptregs.pc + 4;
 774         else
 775                 addr = fp->un.fmtb.baddr;
 776         if (ssw & FC)
 777                 addr -= 2;
 778
 779         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 780                 /* Insn fault on same page as data fault.  But we
 781                    should still create the ATC entry.  */
 782                 goto create_atc_entry;
 783
 784 #ifdef DEBUG
 785         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 786                       "pmove %%psr,%1@"
 787                       : "=a&" (desc)
 788                       : "a" (&temp), "a" (addr));
 789 #else
 790         asm volatile ("ptestr #1,%1@,#7\n\t"
 791                       "pmove %%psr,%0@"
 792                       : : "a" (&temp), "a" (addr));
 793 #endif
 794         mmusr = temp;
 795
 796 #ifdef DEBUG
 797         printk ("mmusr is %#x for addr %#lx in task %p\n",
 798                 mmusr, addr, current);
 799         printk ("descriptor address is %#lx, contents %#lx\n",
 800                 __va(desc), *(unsigned long *)__va(desc));
 801 #endif
 802
 803         if (mmusr & MMU_I)
 804                 do_page_fault (&fp->ptregs, addr, 0);
 805         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 806                 printk ("invalid insn access at %#lx from pc %#lx\n",
 807                         addr, fp->ptregs.pc);
 808 #ifdef DEBUG
 809                 printk("Unknown SIGSEGV - 2\n");
 810 #endif
 811                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 812                 force_sig(SIGSEGV, current);
 813                 return;
 814         }
 815
 816 create_atc_entry:
 817         /* setup an ATC entry for the access about to be retried */
 818         asm volatile ("ploadr #2,%0@" : /* no outputs */
 819                       : "a" (addr));
 820 }
 821 #endif /* CPU_M68020_OR_M68030 */
 822 #endif /* !CONFIG_SUN3 */
 823
 824 asmlinkage void buserr_c(struct frame *fp)
 825 {
 826         /* Only set esp0 if coming from user mode */
 827         if (user_mode(&fp->ptregs))
 828                 current->thread.esp0 = (unsigned long) fp;
 829
 830 #ifdef DEBUG
 831         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 832 #endif
 833
 834         switch (fp->ptregs.format) {
 835 #if defined (CONFIG_M68060)
 836         case 4:                         /* 68060 access error */
 837           access_error060 (fp);
 838           break;
 839 #endif
 840 #if defined (CONFIG_M68040)
 841         case 0x7:                       /* 68040 access error */
 842           access_error040 (fp);
 843           break;
 844 #endif
 845 #if defined (CPU_M68020_OR_M68030)
 846         case 0xa:
 847         case 0xb:
 848           bus_error030 (fp);
 849           break;
 850 #endif
 851         default:
 852           die_if_kernel("bad frame format",&fp->ptregs,0);
 853 #ifdef DEBUG
 854           printk("Unknown SIGSEGV - 4\n");
 855 #endif
 856           force_sig(SIGSEGV, current);
 857         }
 858 }
 859
 860
 861 static int kstack_depth_to_print = 48;
 862
 863 void show_trace(unsigned long *stack)
 864 {
 865         unsigned long *endstack;
 866         unsigned long addr;
 867         int i;
 868
 869         printk("Call Trace:");
 870         addr = (unsigned long)stack + THREAD_SIZE - 1;
 871         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 872         i = 0;
 873         while (stack + 1 <= endstack) {
 874                 addr = *stack++;
 875                 /*
 876                  * If the address is either in the text segment of the
 877                  * kernel, or in the region which contains vmalloc'ed
 878                  * memory, it *may* be the address of a calling
 879                  * routine; if so, print it so that someone tracing
 880                  * down the cause of the crash will be able to figure
 881                  * out the call path that was taken.
 882                  */
 883                 if (__kernel_text_address(addr)) {
 884 #ifndef CONFIG_KALLSYMS
 885                         if (i % 5 == 0)
 886                                 printk("\n       ");
 887 #endif
 888                         printk(" [<%08lx>] %pS\n", addr, (void *)addr);
 889                         i++;
 890                 }
 891         }
 892         printk("\n");
 893 }
 894
 895 void show_registers(struct pt_regs *regs)
 896 {
 897         struct frame *fp = (struct frame *)regs;
 898         mm_segment_t old_fs = get_fs();
 899         u16 c, *cp;
 900         unsigned long addr;
 901         int i;
 902
 903         print_modules();
 904         printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
 905         printk("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
 906         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 907                regs->d0, regs->d1, regs->d2, regs->d3);
 908         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 909                regs->d4, regs->d5, regs->a0, regs->a1);
 910
 911         printk("Process %s (pid: %d, task=%p)\n",
 912                 current->comm, task_pid_nr(current), current);
 913         addr = (unsigned long)&fp->un;
 914         printk("Frame format=%X ", regs->format);
 915         switch (regs->format) {
 916         case 0x2:
 917                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 918                 addr += sizeof(fp->un.fmt2);
 919                 break;
 920         case 0x3:
 921                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 922                 addr += sizeof(fp->un.fmt3);
 923                 break;
 924         case 0x4:
 925                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 926                         : "eff addr=%08lx pc=%08lx\n"),
 927                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 928                 addr += sizeof(fp->un.fmt4);
 929                 break;
 930         case 0x7:
 931                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 932                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 933                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 934                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 935                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 936                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 937                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 938                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 939                 printk("push data: %08lx %08lx %08lx %08lx\n",
 940                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 941                         fp->un.fmt7.pd3);
 942                 addr += sizeof(fp->un.fmt7);
 943                 break;
 944         case 0x9:
 945                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 946                 addr += sizeof(fp->un.fmt9);
 947                 break;
 948         case 0xa:
 949                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 950                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 951                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 952                 addr += sizeof(fp->un.fmta);
 953                 break;
 954         case 0xb:
 955                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 956                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 957                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 958                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 959                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 960                 addr += sizeof(fp->un.fmtb);
 961                 break;
 962         default:
 963                 printk("\n");
 964         }
 965         show_stack(NULL, (unsigned long *)addr);
 966
 967         printk("Code:");
 968         set_fs(KERNEL_DS);
 969         cp = (u16 *)regs->pc;
 970         for (i = -8; i < 16; i++) {
 971                 if (get_user(c, cp + i) && i >= 0) {
 972                         printk(" Bad PC value.");
 973                         break;
 974                 }
 975                 printk(i ? " %04x" : " <%04x>", c);
 976         }
 977         set_fs(old_fs);
 978         printk ("\n");
 979 }
 980
 981 void show_stack(struct task_struct *task, unsigned long *stack)
 982 {
 983         unsigned long *p;
 984         unsigned long *endstack;
 985         int i;
 986
 987         if (!stack) {
 988                 if (task)
 989                         stack = (unsigned long *)task->thread.esp0;
 990                 else
 991                         stack = (unsigned long *)&stack;
 992         }
 993         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 994
 995         printk("Stack from %08lx:", (unsigned long)stack);
 996         p = stack;
 997         for (i = 0; i < kstack_depth_to_print; i++) {
 998                 if (p + 1 > endstack)
 999                         break;
1000                 if (i % 8 == 0)
1001                         printk("\n       ");
1002                 printk(" %08lx", *p++);
1003         }
1004         printk("\n");
1005         show_trace(stack);
1006 }
1007
1008 /*
1009  * The architecture-independent backtrace generator
1010  */
1011 void dump_stack(void)
1012 {
1013         unsigned long stack;
1014
1015         show_trace(&stack);
1016 }
1017
1018 EXPORT_SYMBOL(dump_stack);
1019
1020 void bad_super_trap (struct frame *fp)
1021 {
1022         console_verbose();
1023         if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
1024                 printk ("*** %s ***   FORMAT=%X\n",
1025                         vec_names[(fp->ptregs.vector) >> 2],
1026                         fp->ptregs.format);
1027         else
1028                 printk ("*** Exception %d ***   FORMAT=%X\n",
1029                         (fp->ptregs.vector) >> 2,
1030                         fp->ptregs.format);
1031         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1032                 unsigned short ssw = fp->un.fmtb.ssw;
1033
1034                 printk ("SSW=%#06x  ", ssw);
1035
1036                 if (ssw & RC)
1037                         printk ("Pipe stage C instruction fault at %#010lx\n",
1038                                 (fp->ptregs.format) == 0xA ?
1039                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1040                 if (ssw & RB)
1041                         printk ("Pipe stage B instruction fault at %#010lx\n",
1042                                 (fp->ptregs.format) == 0xA ?
1043                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1044                 if (ssw & DF)
1045                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1046                                 ssw & RW ? "read" : "write",
1047                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1048                                 fp->ptregs.pc);
1049         }
1050         printk ("Current process id is %d\n", task_pid_nr(current));
1051         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1052 }
1053
1054 asmlinkage void trap_c(struct frame *fp)
1055 {
1056         int sig;
1057         siginfo_t info;
1058
1059         if (fp->ptregs.sr & PS_S) {
1060                 if (fp->ptregs.vector == VEC_TRACE << 2) {
1061                         /* traced a trapping instruction on a 68020/30,
1062                          * real exception will be executed afterwards.
1063                          */
1064                 } else if (!handle_kernel_fault(&fp->ptregs))
1065                         bad_super_trap(fp);
1066                 return;
1067         }
1068
1069         /* send the appropriate signal to the user program */
1070         switch ((fp->ptregs.vector) >> 2) {
1071             case VEC_ADDRERR:
1072                 info.si_code = BUS_ADRALN;
1073                 sig = SIGBUS;
1074                 break;
1075             case VEC_ILLEGAL:
1076             case VEC_LINE10:
1077             case VEC_LINE11:
1078                 info.si_code = ILL_ILLOPC;
1079                 sig = SIGILL;
1080                 break;
1081             case VEC_PRIV:
1082                 info.si_code = ILL_PRVOPC;
1083                 sig = SIGILL;
1084                 break;
1085             case VEC_COPROC:
1086                 info.si_code = ILL_COPROC;
1087                 sig = SIGILL;
1088                 break;
1089             case VEC_TRAP1:
1090             case VEC_TRAP2:
1091             case VEC_TRAP3:
1092             case VEC_TRAP4:
1093             case VEC_TRAP5:
1094             case VEC_TRAP6:
1095             case VEC_TRAP7:
1096             case VEC_TRAP8:
1097             case VEC_TRAP9:
1098             case VEC_TRAP10:
1099             case VEC_TRAP11:
1100             case VEC_TRAP12:
1101             case VEC_TRAP13:
1102             case VEC_TRAP14:
1103                 info.si_code = ILL_ILLTRP;
1104                 sig = SIGILL;
1105                 break;
1106             case VEC_FPBRUC:
1107             case VEC_FPOE:
1108             case VEC_FPNAN:
1109                 info.si_code = FPE_FLTINV;
1110                 sig = SIGFPE;
1111                 break;
1112             case VEC_FPIR:
1113                 info.si_code = FPE_FLTRES;
1114                 sig = SIGFPE;
1115                 break;
1116             case VEC_FPDIVZ:
1117                 info.si_code = FPE_FLTDIV;
1118                 sig = SIGFPE;
1119                 break;
1120             case VEC_FPUNDER:
1121                 info.si_code = FPE_FLTUND;
1122                 sig = SIGFPE;
1123                 break;
1124             case VEC_FPOVER:
1125                 info.si_code = FPE_FLTOVF;
1126                 sig = SIGFPE;
1127                 break;
1128             case VEC_ZERODIV:
1129                 info.si_code = FPE_INTDIV;
1130                 sig = SIGFPE;
1131                 break;
1132             case VEC_CHK:
1133             case VEC_TRAP:
1134                 info.si_code = FPE_INTOVF;
1135                 sig = SIGFPE;
1136                 break;
1137             case VEC_TRACE:             /* ptrace single step */
1138                 info.si_code = TRAP_TRACE;
1139                 sig = SIGTRAP;
1140                 break;
1141             case VEC_TRAP15:            /* breakpoint */
1142                 info.si_code = TRAP_BRKPT;
1143                 sig = SIGTRAP;
1144                 break;
1145             default:
1146                 info.si_code = ILL_ILLOPC;
1147                 sig = SIGILL;
1148                 break;
1149         }
1150         info.si_signo = sig;
1151         info.si_errno = 0;
1152         switch (fp->ptregs.format) {
1153             default:
1154                 info.si_addr = (void *) fp->ptregs.pc;
1155                 break;
1156             case 2:
1157                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1158                 break;
1159             case 7:
1160                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1161                 break;
1162             case 9:
1163                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1164                 break;
1165             case 10:
1166                 info.si_addr = (void *) fp->un.fmta.daddr;
1167                 break;
1168             case 11:
1169                 info.si_addr = (void *) fp->un.fmtb.daddr;
1170                 break;
1171         }
1172         force_sig_info (sig, &info, current);
1173 }
1174
1175 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1176 {
1177         if (!(fp->sr & PS_S))
1178                 return;
1179
1180         console_verbose();
1181         printk("%s: %08x\n",str,nr);
1182         show_registers(fp);
1183         add_taint(TAINT_DIE);
1184         do_exit(SIGSEGV);
1185 }
1186
1187 /*
1188  * This function is called if an error occur while accessing
1189  * user-space from the fpsp040 code.
1190  */
1191 asmlinkage void fpsp040_die(void)
1192 {
1193         do_exit(SIGSEGV);
1194 }
1195
1196 #ifdef CONFIG_M68KFPU_EMU
1197 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1198 {
1199         siginfo_t info;
1200
1201         info.si_signo = signal;
1202         info.si_errno = 0;
1203         info.si_code = code;
1204         info.si_addr = addr;
1205         force_sig_info(signal, &info, current);
1206 }
1207 #endif