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