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/sched/debug.h>
  23 #include <linux/signal.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/module.h>
  27 #include <linux/user.h>
  28 #include <linux/string.h>
  29 #include <linux/linkage.h>
  30 #include <linux/init.h>
  31 #include <linux/ptrace.h>
  32 #include <linux/kallsyms.h>
  33
  34 #include <asm/setup.h>
  35 #include <asm/fpu.h>
  36 #include <linux/uaccess.h>
  37 #include <asm/traps.h>
  38 #include <asm/machdep.h>
  39 #include <asm/siginfo.h>
  40 #include <asm/tlbflush.h>
  41
  42 static const char *vec_names[] = {
  43         [VEC_RESETSP]   = "RESET SP",
  44         [VEC_RESETPC]   = "RESET PC",
  45         [VEC_BUSERR]    = "BUS ERROR",
  46         [VEC_ADDRERR]   = "ADDRESS ERROR",
  47         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
  48         [VEC_ZERODIV]   = "ZERO DIVIDE",
  49         [VEC_CHK]       = "CHK",
  50         [VEC_TRAP]      = "TRAPcc",
  51         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
  52         [VEC_TRACE]     = "TRACE",
  53         [VEC_LINE10]    = "LINE 1010",
  54         [VEC_LINE11]    = "LINE 1111",
  55         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
  56         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
  57         [VEC_FORMAT]    = "FORMAT ERROR",
  58         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
  59         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
  60         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
  61         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
  62         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
  63         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
  64         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
  65         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
  66         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
  67         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
  68         [VEC_INT1]      = "LEVEL 1 INT",
  69         [VEC_INT2]      = "LEVEL 2 INT",
  70         [VEC_INT3]      = "LEVEL 3 INT",
  71         [VEC_INT4]      = "LEVEL 4 INT",
  72         [VEC_INT5]      = "LEVEL 5 INT",
  73         [VEC_INT6]      = "LEVEL 6 INT",
  74         [VEC_INT7]      = "LEVEL 7 INT",
  75         [VEC_SYS]       = "SYSCALL",
  76         [VEC_TRAP1]     = "TRAP #1",
  77         [VEC_TRAP2]     = "TRAP #2",
  78         [VEC_TRAP3]     = "TRAP #3",
  79         [VEC_TRAP4]     = "TRAP #4",
  80         [VEC_TRAP5]     = "TRAP #5",
  81         [VEC_TRAP6]     = "TRAP #6",
  82         [VEC_TRAP7]     = "TRAP #7",
  83         [VEC_TRAP8]     = "TRAP #8",
  84         [VEC_TRAP9]     = "TRAP #9",
  85         [VEC_TRAP10]    = "TRAP #10",
  86         [VEC_TRAP11]    = "TRAP #11",
  87         [VEC_TRAP12]    = "TRAP #12",
  88         [VEC_TRAP13]    = "TRAP #13",
  89         [VEC_TRAP14]    = "TRAP #14",
  90         [VEC_TRAP15]    = "TRAP #15",
  91         [VEC_FPBRUC]    = "FPCP BSUN",
  92         [VEC_FPIR]      = "FPCP INEXACT",
  93         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
  94         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
  95         [VEC_FPOE]      = "FPCP OPERAND ERROR",
  96         [VEC_FPOVER]    = "FPCP OVERFLOW",
  97         [VEC_FPNAN]     = "FPCP SNAN",
  98         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
  99         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 100         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 101         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 102         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 103         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 104         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 105         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 106         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 107 };
 108
 109 static const char *space_names[] = {
 110         [0]             = "Space 0",
 111         [USER_DATA]     = "User Data",
 112         [USER_PROGRAM]  = "User Program",
 113 #ifndef CONFIG_SUN3
 114         [3]             = "Space 3",
 115 #else
 116         [FC_CONTROL]    = "Control",
 117 #endif
 118         [4]             = "Space 4",
 119         [SUPER_DATA]    = "Super Data",
 120         [SUPER_PROGRAM] = "Super Program",
 121         [CPU_SPACE]     = "CPU"
 122 };
 123
 124 void die_if_kernel(char *,struct pt_regs *,int);
 125 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 126                              unsigned long error_code);
 127 int send_fault_sig(struct pt_regs *regs);
 128
 129 asmlinkage void trap_c(struct frame *fp);
 130
 131 #if defined (CONFIG_M68060)
 132 static inline void access_error060 (struct frame *fp)
 133 {
 134         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
 135
 136         pr_debug("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 137
 138         if (fslw & MMU060_BPE) {
 139                 /* branch prediction error -> clear branch cache */
 140                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 141                                       "orl   #0x00400000,%/d0\n\t"
 142                                       "movec %/d0,%/cacr"
 143                                       : : : "d0" );
 144                 /* return if there's no other error */
 145                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 146                         return;
 147         }
 148
 149         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 150                 unsigned long errorcode;
 151                 unsigned long addr = fp->un.fmt4.effaddr;
 152
 153                 if (fslw & MMU060_MA)
 154                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 155
 156                 errorcode = 1;
 157                 if (fslw & MMU060_DESC_ERR) {
 158                         __flush_tlb040_one(addr);
 159                         errorcode = 0;
 160                 }
 161                 if (fslw & MMU060_W)
 162                         errorcode |= 2;
 163                 pr_debug("errorcode = %ld\n", errorcode);
 164                 do_page_fault(&fp->ptregs, addr, errorcode);
 165         } else if (fslw & (MMU060_SEE)){
 166                 /* Software Emulation Error.
 167                  * fault during mem_read/mem_write in ifpsp060/os.S
 168                  */
 169                 send_fault_sig(&fp->ptregs);
 170         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 171                    send_fault_sig(&fp->ptregs) > 0) {
 172                 pr_err("pc=%#lx, fa=%#lx\n", fp->ptregs.pc,
 173                        fp->un.fmt4.effaddr);
 174                 pr_err("68060 access error, fslw=%lx\n", fslw);
 175                 trap_c( fp );
 176         }
 177 }
 178 #endif /* CONFIG_M68060 */
 179
 180 #if defined (CONFIG_M68040)
 181 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 182 {
 183         unsigned long mmusr;
 184         mm_segment_t old_fs = get_fs();
 185
 186         set_fs(MAKE_MM_SEG(wbs));
 187
 188         if (iswrite)
 189                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 190         else
 191                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 192
 193         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 194
 195         set_fs(old_fs);
 196
 197         return mmusr;
 198 }
 199
 200 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 201                                    unsigned long wbd)
 202 {
 203         int res = 0;
 204         mm_segment_t old_fs = get_fs();
 205
 206         /* set_fs can not be moved, otherwise put_user() may oops */
 207         set_fs(MAKE_MM_SEG(wbs));
 208
 209         switch (wbs & WBSIZ_040) {
 210         case BA_SIZE_BYTE:
 211                 res = put_user(wbd & 0xff, (char __user *)wba);
 212                 break;
 213         case BA_SIZE_WORD:
 214                 res = put_user(wbd & 0xffff, (short __user *)wba);
 215                 break;
 216         case BA_SIZE_LONG:
 217                 res = put_user(wbd, (int __user *)wba);
 218                 break;
 219         }
 220
 221         /* set_fs can not be moved, otherwise put_user() may oops */
 222         set_fs(old_fs);
 223
 224
 225         pr_debug("do_040writeback1, res=%d\n", res);
 226
 227         return res;
 228 }
 229
 230 /* after an exception in a writeback the stack frame corresponding
 231  * to that exception is discarded, set a few bits in the old frame
 232  * to simulate what it should look like
 233  */
 234 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 235 {
 236         fp->un.fmt7.faddr = wba;
 237         fp->un.fmt7.ssw = wbs & 0xff;
 238         if (wba != current->thread.faddr)
 239             fp->un.fmt7.ssw |= MA_040;
 240 }
 241
 242 static inline void do_040writebacks(struct frame *fp)
 243 {
 244         int res = 0;
 245 #if 0
 246         if (fp->un.fmt7.wb1s & WBV_040)
 247                 pr_err("access_error040: cannot handle 1st writeback. oops.\n");
 248 #endif
 249
 250         if ((fp->un.fmt7.wb2s & WBV_040) &&
 251             !(fp->un.fmt7.wb2s & WBTT_040)) {
 252                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 253                                        fp->un.fmt7.wb2d);
 254                 if (res)
 255                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 256                 else
 257                         fp->un.fmt7.wb2s = 0;
 258         }
 259
 260         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 261         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 262                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 263                                        fp->un.fmt7.wb3d);
 264                 if (res)
 265                     {
 266                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 267
 268                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 269                         fp->un.fmt7.wb3s &= (~WBV_040);
 270                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 271                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 272                     }
 273                 else
 274                         fp->un.fmt7.wb3s = 0;
 275         }
 276
 277         if (res)
 278                 send_fault_sig(&fp->ptregs);
 279 }
 280
 281 /*
 282  * called from sigreturn(), must ensure userspace code didn't
 283  * manipulate exception frame to circumvent protection, then complete
 284  * pending writebacks
 285  * we just clear TM2 to turn it into a userspace access
 286  */
 287 asmlinkage void berr_040cleanup(struct frame *fp)
 288 {
 289         fp->un.fmt7.wb2s &= ~4;
 290         fp->un.fmt7.wb3s &= ~4;
 291
 292         do_040writebacks(fp);
 293 }
 294
 295 static inline void access_error040(struct frame *fp)
 296 {
 297         unsigned short ssw = fp->un.fmt7.ssw;
 298         unsigned long mmusr;
 299
 300         pr_debug("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 301         pr_debug("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 302                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 303         pr_debug("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 304                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 305                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 306
 307         if (ssw & ATC_040) {
 308                 unsigned long addr = fp->un.fmt7.faddr;
 309                 unsigned long errorcode;
 310
 311                 /*
 312                  * The MMU status has to be determined AFTER the address
 313                  * has been corrected if there was a misaligned access (MA).
 314                  */
 315                 if (ssw & MA_040)
 316                         addr = (addr + 7) & -8;
 317
 318                 /* MMU error, get the MMUSR info for this access */
 319                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 320                 pr_debug("mmusr = %lx\n", mmusr);
 321                 errorcode = 1;
 322                 if (!(mmusr & MMU_R_040)) {
 323                         /* clear the invalid atc entry */
 324                         __flush_tlb040_one(addr);
 325                         errorcode = 0;
 326                 }
 327
 328                 /* despite what documentation seems to say, RMW
 329                  * accesses have always both the LK and RW bits set */
 330                 if (!(ssw & RW_040) || (ssw & LK_040))
 331                         errorcode |= 2;
 332
 333                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 334                         pr_debug("do_page_fault() !=0\n");
 335                         if (user_mode(&fp->ptregs)){
 336                                 /* delay writebacks after signal delivery */
 337                                 pr_debug(".. was usermode - return\n");
 338                                 return;
 339                         }
 340                         /* disable writeback into user space from kernel
 341                          * (if do_page_fault didn't fix the mapping,
 342                          * the writeback won't do good)
 343                          */
 344 disable_wb:
 345                         pr_debug(".. disabling wb2\n");
 346                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 347                                 fp->un.fmt7.wb2s &= ~WBV_040;
 348                         if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
 349                                 fp->un.fmt7.wb3s &= ~WBV_040;
 350                 }
 351         } else {
 352                 /* In case of a bus error we either kill the process or expect
 353                  * the kernel to catch the fault, which then is also responsible
 354                  * for cleaning up the mess.
 355                  */
 356                 current->thread.signo = SIGBUS;
 357                 current->thread.faddr = fp->un.fmt7.faddr;
 358                 if (send_fault_sig(&fp->ptregs) >= 0)
 359                         pr_err("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
 360                                fp->un.fmt7.faddr);
 361                 goto disable_wb;
 362         }
 363
 364         do_040writebacks(fp);
 365 }
 366 #endif /* CONFIG_M68040 */
 367
 368 #if defined(CONFIG_SUN3)
 369 #include <asm/sun3mmu.h>
 370
 371 extern int mmu_emu_handle_fault (unsigned long, int, int);
 372
 373 /* sun3 version of bus_error030 */
 374
 375 static inline void bus_error030 (struct frame *fp)
 376 {
 377         unsigned char buserr_type = sun3_get_buserr ();
 378         unsigned long addr, errorcode;
 379         unsigned short ssw = fp->un.fmtb.ssw;
 380         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 381
 382         if (ssw & (FC | FB))
 383                 pr_debug("Instruction fault at %#010lx\n",
 384                         ssw & FC ?
 385                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 386                         :
 387                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 388         if (ssw & DF)
 389                 pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 390                         ssw & RW ? "read" : "write",
 391                         fp->un.fmtb.daddr,
 392                         space_names[ssw & DFC], fp->ptregs.pc);
 393
 394         /*
 395          * Check if this page should be demand-mapped. This needs to go before
 396          * the testing for a bad kernel-space access (demand-mapping applies
 397          * to kernel accesses too).
 398          */
 399
 400         if ((ssw & DF)
 401             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 402                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 403                         return;
 404         }
 405
 406         /* Check for kernel-space pagefault (BAD). */
 407         if (fp->ptregs.sr & PS_S) {
 408                 /* kernel fault must be a data fault to user space */
 409                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 410                      // try checking the kernel mappings before surrender
 411                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 412                           return;
 413                         /* instruction fault or kernel data fault! */
 414                         if (ssw & (FC | FB))
 415                                 pr_err("Instruction fault at %#010lx\n",
 416                                         fp->ptregs.pc);
 417                         if (ssw & DF) {
 418                                 /* was this fault incurred testing bus mappings? */
 419                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 420                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 421                                         send_fault_sig(&fp->ptregs);
 422                                         return;
 423                                 }
 424
 425                                 pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 426                                         ssw & RW ? "read" : "write",
 427                                         fp->un.fmtb.daddr,
 428                                         space_names[ssw & DFC], fp->ptregs.pc);
 429                         }
 430                         pr_err("BAD KERNEL BUSERR\n");
 431
 432                         die_if_kernel("Oops", &fp->ptregs,0);
 433                         force_sig(SIGKILL);
 434                         return;
 435                 }
 436         } else {
 437                 /* user fault */
 438                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 439                         /* not an instruction fault or data fault! BAD */
 440                         panic ("USER BUSERR w/o instruction or data fault");
 441         }
 442
 443
 444         /* First handle the data fault, if any.  */
 445         if (ssw & DF) {
 446                 addr = fp->un.fmtb.daddr;
 447
 448 // errorcode bit 0:     0 -> no page            1 -> protection fault
 449 // errorcode bit 1:     0 -> read fault         1 -> write fault
 450
 451 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 452 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 453
 454                 if (buserr_type & SUN3_BUSERR_PROTERR)
 455                         errorcode = 0x01;
 456                 else if (buserr_type & SUN3_BUSERR_INVALID)
 457                         errorcode = 0x00;
 458                 else {
 459                         pr_debug("*** unexpected busfault type=%#04x\n",
 460                                  buserr_type);
 461                         pr_debug("invalid %s access at %#lx from pc %#lx\n",
 462                                  !(ssw & RW) ? "write" : "read", addr,
 463                                  fp->ptregs.pc);
 464                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 465                         force_sig (SIGBUS);
 466                         return;
 467                 }
 468
 469 //todo: wtf is RM bit? --m
 470                 if (!(ssw & RW) || ssw & RM)
 471                         errorcode |= 0x02;
 472
 473                 /* Handle page fault. */
 474                 do_page_fault (&fp->ptregs, addr, errorcode);
 475
 476                 /* Retry the data fault now. */
 477                 return;
 478         }
 479
 480         /* Now handle the instruction fault. */
 481
 482         /* Get the fault address. */
 483         if (fp->ptregs.format == 0xA)
 484                 addr = fp->ptregs.pc + 4;
 485         else
 486                 addr = fp->un.fmtb.baddr;
 487         if (ssw & FC)
 488                 addr -= 2;
 489
 490         if (buserr_type & SUN3_BUSERR_INVALID) {
 491                 if (!mmu_emu_handle_fault(addr, 1, 0))
 492                         do_page_fault (&fp->ptregs, addr, 0);
 493        } else {
 494                 pr_debug("protection fault on insn access (segv).\n");
 495                 force_sig (SIGSEGV);
 496        }
 497 }
 498 #else
 499 #if defined(CPU_M68020_OR_M68030)
 500 static inline void bus_error030 (struct frame *fp)
 501 {
 502         volatile unsigned short temp;
 503         unsigned short mmusr;
 504         unsigned long addr, errorcode;
 505         unsigned short ssw = fp->un.fmtb.ssw;
 506 #ifdef DEBUG
 507         unsigned long desc;
 508 #endif
 509
 510         pr_debug("pid = %x  ", current->pid);
 511         pr_debug("SSW=%#06x  ", ssw);
 512
 513         if (ssw & (FC | FB))
 514                 pr_debug("Instruction fault at %#010lx\n",
 515                         ssw & FC ?
 516                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 517                         :
 518                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 519         if (ssw & DF)
 520                 pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 521                         ssw & RW ? "read" : "write",
 522                         fp->un.fmtb.daddr,
 523                         space_names[ssw & DFC], fp->ptregs.pc);
 524
 525         /* ++andreas: If a data fault and an instruction fault happen
 526            at the same time map in both pages.  */
 527
 528         /* First handle the data fault, if any.  */
 529         if (ssw & DF) {
 530                 addr = fp->un.fmtb.daddr;
 531
 532 #ifdef DEBUG
 533                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 534                               "pmove %%psr,%1"
 535                               : "=a&" (desc), "=m" (temp)
 536                               : "a" (addr), "d" (ssw));
 537                 pr_debug("mmusr is %#x for addr %#lx in task %p\n",
 538                          temp, addr, current);
 539                 pr_debug("descriptor address is 0x%p, contents %#lx\n",
 540                          __va(desc), *(unsigned long *)__va(desc));
 541 #else
 542                 asm volatile ("ptestr %2,%1@,#7\n\t"
 543                               "pmove %%psr,%0"
 544                               : "=m" (temp) : "a" (addr), "d" (ssw));
 545 #endif
 546                 mmusr = temp;
 547                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 548                 if (!(ssw & RW) || (ssw & RM))
 549                         errorcode |= 2;
 550
 551                 if (mmusr & (MMU_I | MMU_WP)) {
 552                         if (ssw & 4) {
 553                                 pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 554                                        ssw & RW ? "read" : "write",
 555                                        fp->un.fmtb.daddr,
 556                                        space_names[ssw & DFC], fp->ptregs.pc);
 557                                 goto buserr;
 558                         }
 559                         /* Don't try to do anything further if an exception was
 560                            handled. */
 561                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 562                                 return;
 563                 } else if (!(mmusr & MMU_I)) {
 564                         /* probably a 020 cas fault */
 565                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 566                                 pr_err("unexpected bus error (%#x,%#x)\n", ssw,
 567                                        mmusr);
 568                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 569                         pr_err("invalid %s access at %#lx from pc %#lx\n",
 570                                !(ssw & RW) ? "write" : "read", addr,
 571                                fp->ptregs.pc);
 572                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 573                         force_sig(SIGSEGV);
 574                         return;
 575                 } else {
 576 #if 0
 577                         static volatile long tlong;
 578 #endif
 579
 580                         pr_err("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 581                                !(ssw & RW) ? "write" : "read", addr,
 582                                fp->ptregs.pc, ssw);
 583                         asm volatile ("ptestr #1,%1@,#0\n\t"
 584                                       "pmove %%psr,%0"
 585                                       : "=m" (temp)
 586                                       : "a" (addr));
 587                         mmusr = temp;
 588
 589                         pr_err("level 0 mmusr is %#x\n", mmusr);
 590 #if 0
 591                         asm volatile ("pmove %%tt0,%0"
 592                                       : "=m" (tlong));
 593                         pr_debug("tt0 is %#lx, ", tlong);
 594                         asm volatile ("pmove %%tt1,%0"
 595                                       : "=m" (tlong));
 596                         pr_debug("tt1 is %#lx\n", tlong);
 597 #endif
 598                         pr_debug("Unknown SIGSEGV - 1\n");
 599                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 600                         force_sig(SIGSEGV);
 601                         return;
 602                 }
 603
 604                 /* setup an ATC entry for the access about to be retried */
 605                 if (!(ssw & RW) || (ssw & RM))
 606                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 607                                       : "a" (addr), "d" (ssw));
 608                 else
 609                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 610                                       : "a" (addr), "d" (ssw));
 611         }
 612
 613         /* Now handle the instruction fault. */
 614
 615         if (!(ssw & (FC|FB)))
 616                 return;
 617
 618         if (fp->ptregs.sr & PS_S) {
 619                 pr_err("Instruction fault at %#010lx\n", fp->ptregs.pc);
 620         buserr:
 621                 pr_err("BAD KERNEL BUSERR\n");
 622                 die_if_kernel("Oops",&fp->ptregs,0);
 623                 force_sig(SIGKILL);
 624                 return;
 625         }
 626
 627         /* get the fault address */
 628         if (fp->ptregs.format == 10)
 629                 addr = fp->ptregs.pc + 4;
 630         else
 631                 addr = fp->un.fmtb.baddr;
 632         if (ssw & FC)
 633                 addr -= 2;
 634
 635         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 636                 /* Insn fault on same page as data fault.  But we
 637                    should still create the ATC entry.  */
 638                 goto create_atc_entry;
 639
 640 #ifdef DEBUG
 641         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 642                       "pmove %%psr,%1"
 643                       : "=a&" (desc), "=m" (temp)
 644                       : "a" (addr));
 645         pr_debug("mmusr is %#x for addr %#lx in task %p\n",
 646                 temp, addr, current);
 647         pr_debug("descriptor address is 0x%p, contents %#lx\n",
 648                 __va(desc), *(unsigned long *)__va(desc));
 649 #else
 650         asm volatile ("ptestr #1,%1@,#7\n\t"
 651                       "pmove %%psr,%0"
 652                       : "=m" (temp) : "a" (addr));
 653 #endif
 654         mmusr = temp;
 655         if (mmusr & MMU_I)
 656                 do_page_fault (&fp->ptregs, addr, 0);
 657         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 658                 pr_err("invalid insn access at %#lx from pc %#lx\n",
 659                         addr, fp->ptregs.pc);
 660                 pr_debug("Unknown SIGSEGV - 2\n");
 661                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 662                 force_sig(SIGSEGV);
 663                 return;
 664         }
 665
 666 create_atc_entry:
 667         /* setup an ATC entry for the access about to be retried */
 668         asm volatile ("ploadr #2,%0@" : /* no outputs */
 669                       : "a" (addr));
 670 }
 671 #endif /* CPU_M68020_OR_M68030 */
 672 #endif /* !CONFIG_SUN3 */
 673
 674 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
 675 #include <asm/mcfmmu.h>
 676
 677 /*
 678  *      The following table converts the FS encoding of a ColdFire
 679  *      exception stack frame into the error_code value needed by
 680  *      do_fault.
 681 */
 682 static const unsigned char fs_err_code[] = {
 683         0,  /* 0000 */
 684         0,  /* 0001 */
 685         0,  /* 0010 */
 686         0,  /* 0011 */
 687         1,  /* 0100 */
 688         0,  /* 0101 */
 689         0,  /* 0110 */
 690         0,  /* 0111 */
 691         2,  /* 1000 */
 692         3,  /* 1001 */
 693         2,  /* 1010 */
 694         0,  /* 1011 */
 695         1,  /* 1100 */
 696         1,  /* 1101 */
 697         0,  /* 1110 */
 698         0   /* 1111 */
 699 };
 700
 701 static inline void access_errorcf(unsigned int fs, struct frame *fp)
 702 {
 703         unsigned long mmusr, addr;
 704         unsigned int err_code;
 705         int need_page_fault;
 706
 707         mmusr = mmu_read(MMUSR);
 708         addr = mmu_read(MMUAR);
 709
 710         /*
 711          * error_code:
 712          *      bit 0 == 0 means no page found, 1 means protection fault
 713          *      bit 1 == 0 means read, 1 means write
 714          */
 715         switch (fs) {
 716         case  5:  /* 0101 TLB opword X miss */
 717                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0);
 718                 addr = fp->ptregs.pc;
 719                 break;
 720         case  6:  /* 0110 TLB extension word X miss */
 721                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1);
 722                 addr = fp->ptregs.pc + sizeof(long);
 723                 break;
 724         case 10:  /* 1010 TLB W miss */
 725                 need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0);
 726                 break;
 727         case 14: /* 1110 TLB R miss */
 728                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0);
 729                 break;
 730         default:
 731                 /* 0000 Normal  */
 732                 /* 0001 Reserved */
 733                 /* 0010 Interrupt during debug service routine */
 734                 /* 0011 Reserved */
 735                 /* 0100 X Protection */
 736                 /* 0111 IFP in emulator mode */
 737                 /* 1000 W Protection*/
 738                 /* 1001 Write error*/
 739                 /* 1011 Reserved*/
 740                 /* 1100 R Protection*/
 741                 /* 1101 R Protection*/
 742                 /* 1111 OEP in emulator mode*/
 743                 need_page_fault = 1;
 744                 break;
 745         }
 746
 747         if (need_page_fault) {
 748                 err_code = fs_err_code[fs];
 749                 if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */
 750                         err_code |= 2; /* bit1 - write, bit0 - protection */
 751                 do_page_fault(&fp->ptregs, addr, err_code);
 752         }
 753 }
 754 #endif /* CONFIG_COLDFIRE CONFIG_MMU */
 755
 756 asmlinkage void buserr_c(struct frame *fp)
 757 {
 758         /* Only set esp0 if coming from user mode */
 759         if (user_mode(&fp->ptregs))
 760                 current->thread.esp0 = (unsigned long) fp;
 761
 762         pr_debug("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 763
 764 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
 765         if (CPU_IS_COLDFIRE) {
 766                 unsigned int fs;
 767                 fs = (fp->ptregs.vector & 0x3) |
 768                         ((fp->ptregs.vector & 0xc00) >> 8);
 769                 switch (fs) {
 770                 case 0x5:
 771                 case 0x6:
 772                 case 0x7:
 773                 case 0x9:
 774                 case 0xa:
 775                 case 0xd:
 776                 case 0xe:
 777                 case 0xf:
 778                         access_errorcf(fs, fp);
 779                         return;
 780                 default:
 781                         break;
 782                 }
 783         }
 784 #endif /* CONFIG_COLDFIRE && CONFIG_MMU */
 785
 786         switch (fp->ptregs.format) {
 787 #if defined (CONFIG_M68060)
 788         case 4:                         /* 68060 access error */
 789           access_error060 (fp);
 790           break;
 791 #endif
 792 #if defined (CONFIG_M68040)
 793         case 0x7:                       /* 68040 access error */
 794           access_error040 (fp);
 795           break;
 796 #endif
 797 #if defined (CPU_M68020_OR_M68030)
 798         case 0xa:
 799         case 0xb:
 800           bus_error030 (fp);
 801           break;
 802 #endif
 803         default:
 804           die_if_kernel("bad frame format",&fp->ptregs,0);
 805           pr_debug("Unknown SIGSEGV - 4\n");
 806           force_sig(SIGSEGV);
 807         }
 808 }
 809
 810
 811 static int kstack_depth_to_print = 48;
 812
 813 static void show_trace(unsigned long *stack, const char *loglvl)
 814 {
 815         unsigned long *endstack;
 816         unsigned long addr;
 817         int i;
 818
 819         printk("%sCall Trace:", loglvl);
 820         addr = (unsigned long)stack + THREAD_SIZE - 1;
 821         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 822         i = 0;
 823         while (stack + 1 <= endstack) {
 824                 addr = *stack++;
 825                 /*
 826                  * If the address is either in the text segment of the
 827                  * kernel, or in the region which contains vmalloc'ed
 828                  * memory, it *may* be the address of a calling
 829                  * routine; if so, print it so that someone tracing
 830                  * down the cause of the crash will be able to figure
 831                  * out the call path that was taken.
 832                  */
 833                 if (__kernel_text_address(addr)) {
 834 #ifndef CONFIG_KALLSYMS
 835                         if (i % 5 == 0)
 836                                 pr_cont("\n       ");
 837 #endif
 838                         pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr);
 839                         i++;
 840                 }
 841         }
 842         pr_cont("\n");
 843 }
 844
 845 void show_registers(struct pt_regs *regs)
 846 {
 847         struct frame *fp = (struct frame *)regs;
 848         u16 c, *cp;
 849         unsigned long addr;
 850         int i;
 851
 852         print_modules();
 853         pr_info("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
 854         pr_info("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
 855         pr_info("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 856                regs->d0, regs->d1, regs->d2, regs->d3);
 857         pr_info("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 858                regs->d4, regs->d5, regs->a0, regs->a1);
 859
 860         pr_info("Process %s (pid: %d, task=%p)\n",
 861                 current->comm, task_pid_nr(current), current);
 862         addr = (unsigned long)&fp->un;
 863         pr_info("Frame format=%X ", regs->format);
 864         switch (regs->format) {
 865         case 0x2:
 866                 pr_cont("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 867                 addr += sizeof(fp->un.fmt2);
 868                 break;
 869         case 0x3:
 870                 pr_cont("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 871                 addr += sizeof(fp->un.fmt3);
 872                 break;
 873         case 0x4:
 874                 if (CPU_IS_060)
 875                         pr_cont("fault addr=%08lx fslw=%08lx\n",
 876                                 fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 877                 else
 878                         pr_cont("eff addr=%08lx pc=%08lx\n",
 879                                 fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 880                 addr += sizeof(fp->un.fmt4);
 881                 break;
 882         case 0x7:
 883                 pr_cont("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 884                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 885                 pr_info("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 886                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 887                 pr_info("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 888                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 889                 pr_info("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 890                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 891                 pr_info("push data: %08lx %08lx %08lx %08lx\n",
 892                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 893                         fp->un.fmt7.pd3);
 894                 addr += sizeof(fp->un.fmt7);
 895                 break;
 896         case 0x9:
 897                 pr_cont("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 898                 addr += sizeof(fp->un.fmt9);
 899                 break;
 900         case 0xa:
 901                 pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 902                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 903                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 904                 addr += sizeof(fp->un.fmta);
 905                 break;
 906         case 0xb:
 907                 pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 908                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 909                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 910                 pr_info("baddr=%08lx dibuf=%08lx ver=%x\n",
 911                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 912                 addr += sizeof(fp->un.fmtb);
 913                 break;
 914         default:
 915                 pr_cont("\n");
 916         }
 917         show_stack(NULL, (unsigned long *)addr, KERN_INFO);
 918
 919         pr_info("Code:");
 920         cp = (u16 *)regs->pc;
 921         for (i = -8; i < 16; i++) {
 922                 if (get_kernel_nofault(c, cp + i) && i >= 0) {
 923                         pr_cont(" Bad PC value.");
 924                         break;
 925                 }
 926                 if (i)
 927                         pr_cont(" %04x", c);
 928                 else
 929                         pr_cont(" <%04x>", c);
 930         }
 931         pr_cont("\n");
 932 }
 933
 934 void show_stack(struct task_struct *task, unsigned long *stack,
 935                 const char *loglvl)
 936 {
 937         unsigned long *p;
 938         unsigned long *endstack;
 939         int i;
 940
 941         if (!stack) {
 942                 if (task)
 943                         stack = (unsigned long *)task->thread.esp0;
 944                 else
 945                         stack = (unsigned long *)&stack;
 946         }
 947         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 948
 949         printk("%sStack from %08lx:", loglvl, (unsigned long)stack);
 950         p = stack;
 951         for (i = 0; i < kstack_depth_to_print; i++) {
 952                 if (p + 1 > endstack)
 953                         break;
 954                 if (i % 8 == 0)
 955                         pr_cont("\n       ");
 956                 pr_cont(" %08lx", *p++);
 957         }
 958         pr_cont("\n");
 959         show_trace(stack, loglvl);
 960 }
 961
 962 /*
 963  * The vector number returned in the frame pointer may also contain
 964  * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
 965  * 2 bits, and upper 2 bits. So we need to mask out the real vector
 966  * number before using it in comparisons. You don't need to do this on
 967  * real 68k parts, but it won't hurt either.
 968  */
 969
 970 void bad_super_trap (struct frame *fp)
 971 {
 972         int vector = (fp->ptregs.vector >> 2) & 0xff;
 973
 974         console_verbose();
 975         if (vector < ARRAY_SIZE(vec_names))
 976                 pr_err("*** %s ***   FORMAT=%X\n",
 977                         vec_names[vector],
 978                         fp->ptregs.format);
 979         else
 980                 pr_err("*** Exception %d ***   FORMAT=%X\n",
 981                         vector, fp->ptregs.format);
 982         if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
 983                 unsigned short ssw = fp->un.fmtb.ssw;
 984
 985                 pr_err("SSW=%#06x  ", ssw);
 986
 987                 if (ssw & RC)
 988                         pr_err("Pipe stage C instruction fault at %#010lx\n",
 989                                 (fp->ptregs.format) == 0xA ?
 990                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
 991                 if (ssw & RB)
 992                         pr_err("Pipe stage B instruction fault at %#010lx\n",
 993                                 (fp->ptregs.format) == 0xA ?
 994                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 995                 if (ssw & DF)
 996                         pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 997                                 ssw & RW ? "read" : "write",
 998                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
 999                                 fp->ptregs.pc);
1000         }
1001         pr_err("Current process id is %d\n", task_pid_nr(current));
1002         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1003 }
1004
1005 asmlinkage void trap_c(struct frame *fp)
1006 {
1007         int sig, si_code;
1008         void __user *addr;
1009         int vector = (fp->ptregs.vector >> 2) & 0xff;
1010
1011         if (fp->ptregs.sr & PS_S) {
1012                 if (vector == VEC_TRACE) {
1013                         /* traced a trapping instruction on a 68020/30,
1014                          * real exception will be executed afterwards.
1015                          */
1016                         return;
1017                 }
1018 #ifdef CONFIG_MMU
1019                 if (fixup_exception(&fp->ptregs))
1020                         return;
1021 #endif
1022                 bad_super_trap(fp);
1023                 return;
1024         }
1025
1026         /* send the appropriate signal to the user program */
1027         switch (vector) {
1028             case VEC_ADDRERR:
1029                 si_code = BUS_ADRALN;
1030                 sig = SIGBUS;
1031                 break;
1032             case VEC_ILLEGAL:
1033             case VEC_LINE10:
1034             case VEC_LINE11:
1035                 si_code = ILL_ILLOPC;
1036                 sig = SIGILL;
1037                 break;
1038             case VEC_PRIV:
1039                 si_code = ILL_PRVOPC;
1040                 sig = SIGILL;
1041                 break;
1042             case VEC_COPROC:
1043                 si_code = ILL_COPROC;
1044                 sig = SIGILL;
1045                 break;
1046             case VEC_TRAP1:
1047             case VEC_TRAP2:
1048             case VEC_TRAP3:
1049             case VEC_TRAP4:
1050             case VEC_TRAP5:
1051             case VEC_TRAP6:
1052             case VEC_TRAP7:
1053             case VEC_TRAP8:
1054             case VEC_TRAP9:
1055             case VEC_TRAP10:
1056             case VEC_TRAP11:
1057             case VEC_TRAP12:
1058             case VEC_TRAP13:
1059             case VEC_TRAP14:
1060                 si_code = ILL_ILLTRP;
1061                 sig = SIGILL;
1062                 break;
1063             case VEC_FPBRUC:
1064             case VEC_FPOE:
1065             case VEC_FPNAN:
1066                 si_code = FPE_FLTINV;
1067                 sig = SIGFPE;
1068                 break;
1069             case VEC_FPIR:
1070                 si_code = FPE_FLTRES;
1071                 sig = SIGFPE;
1072                 break;
1073             case VEC_FPDIVZ:
1074                 si_code = FPE_FLTDIV;
1075                 sig = SIGFPE;
1076                 break;
1077             case VEC_FPUNDER:
1078                 si_code = FPE_FLTUND;
1079                 sig = SIGFPE;
1080                 break;
1081             case VEC_FPOVER:
1082                 si_code = FPE_FLTOVF;
1083                 sig = SIGFPE;
1084                 break;
1085             case VEC_ZERODIV:
1086                 si_code = FPE_INTDIV;
1087                 sig = SIGFPE;
1088                 break;
1089             case VEC_CHK:
1090             case VEC_TRAP:
1091                 si_code = FPE_INTOVF;
1092                 sig = SIGFPE;
1093                 break;
1094             case VEC_TRACE:             /* ptrace single step */
1095                 si_code = TRAP_TRACE;
1096                 sig = SIGTRAP;
1097                 break;
1098             case VEC_TRAP15:            /* breakpoint */
1099                 si_code = TRAP_BRKPT;
1100                 sig = SIGTRAP;
1101                 break;
1102             default:
1103                 si_code = ILL_ILLOPC;
1104                 sig = SIGILL;
1105                 break;
1106         }
1107         switch (fp->ptregs.format) {
1108             default:
1109                 addr = (void __user *) fp->ptregs.pc;
1110                 break;
1111             case 2:
1112                 addr = (void __user *) fp->un.fmt2.iaddr;
1113                 break;
1114             case 7:
1115                 addr = (void __user *) fp->un.fmt7.effaddr;
1116                 break;
1117             case 9:
1118                 addr = (void __user *) fp->un.fmt9.iaddr;
1119                 break;
1120             case 10:
1121                 addr = (void __user *) fp->un.fmta.daddr;
1122                 break;
1123             case 11:
1124                 addr = (void __user*) fp->un.fmtb.daddr;
1125                 break;
1126         }
1127         force_sig_fault(sig, si_code, addr);
1128 }
1129
1130 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1131 {
1132         if (!(fp->sr & PS_S))
1133                 return;
1134
1135         console_verbose();
1136         pr_crit("%s: %08x\n", str, nr);
1137         show_registers(fp);
1138         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
1139         do_exit(SIGSEGV);
1140 }
1141
1142 asmlinkage void set_esp0(unsigned long ssp)
1143 {
1144         current->thread.esp0 = ssp;
1145 }
1146
1147 /*
1148  * This function is called if an error occur while accessing
1149  * user-space from the fpsp040 code.
1150  */
1151 asmlinkage void fpsp040_die(void)
1152 {
1153         force_sigsegv(SIGSEGV);
1154 }
1155
1156 #ifdef CONFIG_M68KFPU_EMU
1157 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1158 {
1159         force_sig_fault(signal, code, addr);
1160 }
1161 #endif