arch/m68k/kernel/traps.c

   1 /*
   2  *  linux/arch/m68k/kernel/traps.c
   3  *
   4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
   5  *
   6  *  68040 fixes by Michael Rausch
   7  *  68040 fixes by Martin Apel
   8  *  68040 fixes and writeback by Richard Zidlicky
   9  *  68060 fixes by Roman Hodek
  10  *  68060 fixes by Jesper Skov
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 /*
  18  * Sets up all exception vectors
  19  */
  20
  21 #include <linux/sched.h>
  22 #include <linux/signal.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/user.h>
  27 #include <linux/string.h>
  28 #include <linux/linkage.h>
  29 #include <linux/init.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/kallsyms.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/fpu.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/traps.h>
  37 #include <asm/pgalloc.h>
  38 #include <asm/machdep.h>
  39 #include <asm/siginfo.h>
  40
  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 #ifdef DEBUG
 137         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
 138 #endif
 139
 140         if (fslw & MMU060_BPE) {
 141                 /* branch prediction error -> clear branch cache */
 142                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
 143                                       "orl   #0x00400000,%/d0\n\t"
 144                                       "movec %/d0,%/cacr"
 145                                       : : : "d0" );
 146                 /* return if there's no other error */
 147                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
 148                         return;
 149         }
 150
 151         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
 152                 unsigned long errorcode;
 153                 unsigned long addr = fp->un.fmt4.effaddr;
 154
 155                 if (fslw & MMU060_MA)
 156                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
 157
 158                 errorcode = 1;
 159                 if (fslw & MMU060_DESC_ERR) {
 160                         __flush_tlb040_one(addr);
 161                         errorcode = 0;
 162                 }
 163                 if (fslw & MMU060_W)
 164                         errorcode |= 2;
 165 #ifdef DEBUG
 166                 printk("errorcode = %d\n", errorcode );
 167 #endif
 168                 do_page_fault(&fp->ptregs, addr, errorcode);
 169         } else if (fslw & (MMU060_SEE)){
 170                 /* Software Emulation Error.
 171                  * fault during mem_read/mem_write in ifpsp060/os.S
 172                  */
 173                 send_fault_sig(&fp->ptregs);
 174         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
 175                    send_fault_sig(&fp->ptregs) > 0) {
 176                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
 177                 printk( "68060 access error, fslw=%lx\n", fslw );
 178                 trap_c( fp );
 179         }
 180 }
 181 #endif /* CONFIG_M68060 */
 182
 183 #if defined (CONFIG_M68040)
 184 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
 185 {
 186         unsigned long mmusr;
 187         mm_segment_t old_fs = get_fs();
 188
 189         set_fs(MAKE_MM_SEG(wbs));
 190
 191         if (iswrite)
 192                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 193         else
 194                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 195
 196         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 197
 198         set_fs(old_fs);
 199
 200         return mmusr;
 201 }
 202
 203 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 204                                    unsigned long wbd)
 205 {
 206         int res = 0;
 207         mm_segment_t old_fs = get_fs();
 208
 209         /* set_fs can not be moved, otherwise put_user() may oops */
 210         set_fs(MAKE_MM_SEG(wbs));
 211
 212         switch (wbs & WBSIZ_040) {
 213         case BA_SIZE_BYTE:
 214                 res = put_user(wbd & 0xff, (char __user *)wba);
 215                 break;
 216         case BA_SIZE_WORD:
 217                 res = put_user(wbd & 0xffff, (short __user *)wba);
 218                 break;
 219         case BA_SIZE_LONG:
 220                 res = put_user(wbd, (int __user *)wba);
 221                 break;
 222         }
 223
 224         /* set_fs can not be moved, otherwise put_user() may oops */
 225         set_fs(old_fs);
 226
 227
 228 #ifdef DEBUG
 229         printk("do_040writeback1, res=%d\n",res);
 230 #endif
 231
 232         return res;
 233 }
 234
 235 /* after an exception in a writeback the stack frame corresponding
 236  * to that exception is discarded, set a few bits in the old frame
 237  * to simulate what it should look like
 238  */
 239 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 240 {
 241         fp->un.fmt7.faddr = wba;
 242         fp->un.fmt7.ssw = wbs & 0xff;
 243         if (wba != current->thread.faddr)
 244             fp->un.fmt7.ssw |= MA_040;
 245 }
 246
 247 static inline void do_040writebacks(struct frame *fp)
 248 {
 249         int res = 0;
 250 #if 0
 251         if (fp->un.fmt7.wb1s & WBV_040)
 252                 printk("access_error040: cannot handle 1st writeback. oops.\n");
 253 #endif
 254
 255         if ((fp->un.fmt7.wb2s & WBV_040) &&
 256             !(fp->un.fmt7.wb2s & WBTT_040)) {
 257                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 258                                        fp->un.fmt7.wb2d);
 259                 if (res)
 260                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 261                 else
 262                         fp->un.fmt7.wb2s = 0;
 263         }
 264
 265         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 266         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 267                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 268                                        fp->un.fmt7.wb3d);
 269                 if (res)
 270                     {
 271                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 272
 273                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 274                         fp->un.fmt7.wb3s &= (~WBV_040);
 275                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 276                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 277                     }
 278                 else
 279                         fp->un.fmt7.wb3s = 0;
 280         }
 281
 282         if (res)
 283                 send_fault_sig(&fp->ptregs);
 284 }
 285
 286 /*
 287  * called from sigreturn(), must ensure userspace code didn't
 288  * manipulate exception frame to circumvent protection, then complete
 289  * pending writebacks
 290  * we just clear TM2 to turn it into a userspace access
 291  */
 292 asmlinkage void berr_040cleanup(struct frame *fp)
 293 {
 294         fp->un.fmt7.wb2s &= ~4;
 295         fp->un.fmt7.wb3s &= ~4;
 296
 297         do_040writebacks(fp);
 298 }
 299
 300 static inline void access_error040(struct frame *fp)
 301 {
 302         unsigned short ssw = fp->un.fmt7.ssw;
 303         unsigned long mmusr;
 304
 305 #ifdef DEBUG
 306         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 307         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 308                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 309         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 310                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 311                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 312 #endif
 313
 314         if (ssw & ATC_040) {
 315                 unsigned long addr = fp->un.fmt7.faddr;
 316                 unsigned long errorcode;
 317
 318                 /*
 319                  * The MMU status has to be determined AFTER the address
 320                  * has been corrected if there was a misaligned access (MA).
 321                  */
 322                 if (ssw & MA_040)
 323                         addr = (addr + 7) & -8;
 324
 325                 /* MMU error, get the MMUSR info for this access */
 326                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 327 #ifdef DEBUG
 328                 printk("mmusr = %lx\n", mmusr);
 329 #endif
 330                 errorcode = 1;
 331                 if (!(mmusr & MMU_R_040)) {
 332                         /* clear the invalid atc entry */
 333                         __flush_tlb040_one(addr);
 334                         errorcode = 0;
 335                 }
 336
 337                 /* despite what documentation seems to say, RMW
 338                  * accesses have always both the LK and RW bits set */
 339                 if (!(ssw & RW_040) || (ssw & LK_040))
 340                         errorcode |= 2;
 341
 342                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 343 #ifdef DEBUG
 344                         printk("do_page_fault() !=0\n");
 345 #endif
 346                         if (user_mode(&fp->ptregs)){
 347                                 /* delay writebacks after signal delivery */
 348 #ifdef DEBUG
 349                                 printk(".. was usermode - return\n");
 350 #endif
 351                                 return;
 352                         }
 353                         /* disable writeback into user space from kernel
 354                          * (if do_page_fault didn't fix the mapping,
 355                          * the writeback won't do good)
 356                          */
 357 disable_wb:
 358 #ifdef DEBUG
 359                         printk(".. disabling wb2\n");
 360 #endif
 361                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 362                                 fp->un.fmt7.wb2s &= ~WBV_040;
 363                         if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
 364                                 fp->un.fmt7.wb3s &= ~WBV_040;
 365                 }
 366         } else {
 367                 /* In case of a bus error we either kill the process or expect
 368                  * the kernel to catch the fault, which then is also responsible
 369                  * for cleaning up the mess.
 370                  */
 371                 current->thread.signo = SIGBUS;
 372                 current->thread.faddr = fp->un.fmt7.faddr;
 373                 if (send_fault_sig(&fp->ptregs) >= 0)
 374                         printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
 375                                fp->un.fmt7.faddr);
 376                 goto disable_wb;
 377         }
 378
 379         do_040writebacks(fp);
 380 }
 381 #endif /* CONFIG_M68040 */
 382
 383 #if defined(CONFIG_SUN3)
 384 #include <asm/sun3mmu.h>
 385
 386 extern int mmu_emu_handle_fault (unsigned long, int, int);
 387
 388 /* sun3 version of bus_error030 */
 389
 390 static inline void bus_error030 (struct frame *fp)
 391 {
 392         unsigned char buserr_type = sun3_get_buserr ();
 393         unsigned long addr, errorcode;
 394         unsigned short ssw = fp->un.fmtb.ssw;
 395         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 396
 397 #ifdef DEBUG
 398         if (ssw & (FC | FB))
 399                 printk ("Instruction fault at %#010lx\n",
 400                         ssw & FC ?
 401                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 402                         :
 403                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 404         if (ssw & DF)
 405                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 406                         ssw & RW ? "read" : "write",
 407                         fp->un.fmtb.daddr,
 408                         space_names[ssw & DFC], fp->ptregs.pc);
 409 #endif
 410
 411         /*
 412          * Check if this page should be demand-mapped. This needs to go before
 413          * the testing for a bad kernel-space access (demand-mapping applies
 414          * to kernel accesses too).
 415          */
 416
 417         if ((ssw & DF)
 418             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 419                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 420                         return;
 421         }
 422
 423         /* Check for kernel-space pagefault (BAD). */
 424         if (fp->ptregs.sr & PS_S) {
 425                 /* kernel fault must be a data fault to user space */
 426                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 427                      // try checking the kernel mappings before surrender
 428                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 429                           return;
 430                         /* instruction fault or kernel data fault! */
 431                         if (ssw & (FC | FB))
 432                                 printk ("Instruction fault at %#010lx\n",
 433                                         fp->ptregs.pc);
 434                         if (ssw & DF) {
 435                                 /* was this fault incurred testing bus mappings? */
 436                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 437                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 438                                         send_fault_sig(&fp->ptregs);
 439                                         return;
 440                                 }
 441
 442                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 443                                         ssw & RW ? "read" : "write",
 444                                         fp->un.fmtb.daddr,
 445                                         space_names[ssw & DFC], fp->ptregs.pc);
 446                         }
 447                         printk ("BAD KERNEL BUSERR\n");
 448
 449                         die_if_kernel("Oops", &fp->ptregs,0);
 450                         force_sig(SIGKILL, current);
 451                         return;
 452                 }
 453         } else {
 454                 /* user fault */
 455                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 456                         /* not an instruction fault or data fault! BAD */
 457                         panic ("USER BUSERR w/o instruction or data fault");
 458         }
 459
 460
 461         /* First handle the data fault, if any.  */
 462         if (ssw & DF) {
 463                 addr = fp->un.fmtb.daddr;
 464
 465 // errorcode bit 0:     0 -> no page            1 -> protection fault
 466 // errorcode bit 1:     0 -> read fault         1 -> write fault
 467
 468 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 469 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 470
 471                 if (buserr_type & SUN3_BUSERR_PROTERR)
 472                         errorcode = 0x01;
 473                 else if (buserr_type & SUN3_BUSERR_INVALID)
 474                         errorcode = 0x00;
 475                 else {
 476 #ifdef DEBUG
 477                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
 478                         printk ("invalid %s access at %#lx from pc %#lx\n",
 479                                 !(ssw & RW) ? "write" : "read", addr,
 480                                 fp->ptregs.pc);
 481 #endif
 482                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 483                         force_sig (SIGBUS, current);
 484                         return;
 485                 }
 486
 487 //todo: wtf is RM bit? --m
 488                 if (!(ssw & RW) || ssw & RM)
 489                         errorcode |= 0x02;
 490
 491                 /* Handle page fault. */
 492                 do_page_fault (&fp->ptregs, addr, errorcode);
 493
 494                 /* Retry the data fault now. */
 495                 return;
 496         }
 497
 498         /* Now handle the instruction fault. */
 499
 500         /* Get the fault address. */
 501         if (fp->ptregs.format == 0xA)
 502                 addr = fp->ptregs.pc + 4;
 503         else
 504                 addr = fp->un.fmtb.baddr;
 505         if (ssw & FC)
 506                 addr -= 2;
 507
 508         if (buserr_type & SUN3_BUSERR_INVALID) {
 509                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
 510                         do_page_fault (&fp->ptregs, addr, 0);
 511        } else {
 512 #ifdef DEBUG
 513                 printk ("protection fault on insn access (segv).\n");
 514 #endif
 515                 force_sig (SIGSEGV, current);
 516        }
 517 }
 518 #else
 519 #if defined(CPU_M68020_OR_M68030)
 520 static inline void bus_error030 (struct frame *fp)
 521 {
 522         volatile unsigned short temp;
 523         unsigned short mmusr;
 524         unsigned long addr, errorcode;
 525         unsigned short ssw = fp->un.fmtb.ssw;
 526 #ifdef DEBUG
 527         unsigned long desc;
 528
 529         printk ("pid = %x  ", current->pid);
 530         printk ("SSW=%#06x  ", ssw);
 531
 532         if (ssw & (FC | FB))
 533                 printk ("Instruction fault at %#010lx\n",
 534                         ssw & FC ?
 535                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 536                         :
 537                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 538         if (ssw & DF)
 539                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 540                         ssw & RW ? "read" : "write",
 541                         fp->un.fmtb.daddr,
 542                         space_names[ssw & DFC], fp->ptregs.pc);
 543 #endif
 544
 545         /* ++andreas: If a data fault and an instruction fault happen
 546            at the same time map in both pages.  */
 547
 548         /* First handle the data fault, if any.  */
 549         if (ssw & DF) {
 550                 addr = fp->un.fmtb.daddr;
 551
 552 #ifdef DEBUG
 553                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 554                               "pmove %%psr,%1"
 555                               : "=a&" (desc), "=m" (temp)
 556                               : "a" (addr), "d" (ssw));
 557 #else
 558                 asm volatile ("ptestr %2,%1@,#7\n\t"
 559                               "pmove %%psr,%0"
 560                               : "=m" (temp) : "a" (addr), "d" (ssw));
 561 #endif
 562                 mmusr = temp;
 563
 564 #ifdef DEBUG
 565                 printk("mmusr is %#x for addr %#lx in task %p\n",
 566                        mmusr, addr, current);
 567                 printk("descriptor address is %#lx, contents %#lx\n",
 568                        __va(desc), *(unsigned long *)__va(desc));
 569 #endif
 570
 571                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 572                 if (!(ssw & RW) || (ssw & RM))
 573                         errorcode |= 2;
 574
 575                 if (mmusr & (MMU_I | MMU_WP)) {
 576                         if (ssw & 4) {
 577                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 578                                        ssw & RW ? "read" : "write",
 579                                        fp->un.fmtb.daddr,
 580                                        space_names[ssw & DFC], fp->ptregs.pc);
 581                                 goto buserr;
 582                         }
 583                         /* Don't try to do anything further if an exception was
 584                            handled. */
 585                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 586                                 return;
 587                 } else if (!(mmusr & MMU_I)) {
 588                         /* probably a 020 cas fault */
 589                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 590                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
 591                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 592                         printk("invalid %s access at %#lx from pc %#lx\n",
 593                                !(ssw & RW) ? "write" : "read", addr,
 594                                fp->ptregs.pc);
 595                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 596                         force_sig(SIGSEGV, current);
 597                         return;
 598                 } else {
 599 #if 0
 600                         static volatile long tlong;
 601 #endif
 602
 603                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 604                                !(ssw & RW) ? "write" : "read", addr,
 605                                fp->ptregs.pc, ssw);
 606                         asm volatile ("ptestr #1,%1@,#0\n\t"
 607                                       "pmove %%psr,%0"
 608                                       : "=m" (temp)
 609                                       : "a" (addr));
 610                         mmusr = temp;
 611
 612                         printk ("level 0 mmusr is %#x\n", mmusr);
 613 #if 0
 614                         asm volatile ("pmove %%tt0,%0"
 615                                       : "=m" (tlong));
 616                         printk("tt0 is %#lx, ", tlong);
 617                         asm volatile ("pmove %%tt1,%0"
 618                                       : "=m" (tlong));
 619                         printk("tt1 is %#lx\n", tlong);
 620 #endif
 621 #ifdef DEBUG
 622                         printk("Unknown SIGSEGV - 1\n");
 623 #endif
 624                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 625                         force_sig(SIGSEGV, current);
 626                         return;
 627                 }
 628
 629                 /* setup an ATC entry for the access about to be retried */
 630                 if (!(ssw & RW) || (ssw & RM))
 631                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 632                                       : "a" (addr), "d" (ssw));
 633                 else
 634                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 635                                       : "a" (addr), "d" (ssw));
 636         }
 637
 638         /* Now handle the instruction fault. */
 639
 640         if (!(ssw & (FC|FB)))
 641                 return;
 642
 643         if (fp->ptregs.sr & PS_S) {
 644                 printk("Instruction fault at %#010lx\n",
 645                         fp->ptregs.pc);
 646         buserr:
 647                 printk ("BAD KERNEL BUSERR\n");
 648                 die_if_kernel("Oops",&fp->ptregs,0);
 649                 force_sig(SIGKILL, current);
 650                 return;
 651         }
 652
 653         /* get the fault address */
 654         if (fp->ptregs.format == 10)
 655                 addr = fp->ptregs.pc + 4;
 656         else
 657                 addr = fp->un.fmtb.baddr;
 658         if (ssw & FC)
 659                 addr -= 2;
 660
 661         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 662                 /* Insn fault on same page as data fault.  But we
 663                    should still create the ATC entry.  */
 664                 goto create_atc_entry;
 665
 666 #ifdef DEBUG
 667         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 668                       "pmove %%psr,%1"
 669                       : "=a&" (desc), "=m" (temp)
 670                       : "a" (addr));
 671 #else
 672         asm volatile ("ptestr #1,%1@,#7\n\t"
 673                       "pmove %%psr,%0"
 674                       : "=m" (temp) : "a" (addr));
 675 #endif
 676         mmusr = temp;
 677
 678 #ifdef DEBUG
 679         printk ("mmusr is %#x for addr %#lx in task %p\n",
 680                 mmusr, addr, current);
 681         printk ("descriptor address is %#lx, contents %#lx\n",
 682                 __va(desc), *(unsigned long *)__va(desc));
 683 #endif
 684
 685         if (mmusr & MMU_I)
 686                 do_page_fault (&fp->ptregs, addr, 0);
 687         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 688                 printk ("invalid insn access at %#lx from pc %#lx\n",
 689                         addr, fp->ptregs.pc);
 690 #ifdef DEBUG
 691                 printk("Unknown SIGSEGV - 2\n");
 692 #endif
 693                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 694                 force_sig(SIGSEGV, current);
 695                 return;
 696         }
 697
 698 create_atc_entry:
 699         /* setup an ATC entry for the access about to be retried */
 700         asm volatile ("ploadr #2,%0@" : /* no outputs */
 701                       : "a" (addr));
 702 }
 703 #endif /* CPU_M68020_OR_M68030 */
 704 #endif /* !CONFIG_SUN3 */
 705
 706 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
 707 #include <asm/mcfmmu.h>
 708
 709 /*
 710  *      The following table converts the FS encoding of a ColdFire
 711  *      exception stack frame into the error_code value needed by
 712  *      do_fault.
 713 */
 714 static const unsigned char fs_err_code[] = {
 715         0,  /* 0000 */
 716         0,  /* 0001 */
 717         0,  /* 0010 */
 718         0,  /* 0011 */
 719         1,  /* 0100 */
 720         0,  /* 0101 */
 721         0,  /* 0110 */
 722         0,  /* 0111 */
 723         2,  /* 1000 */
 724         3,  /* 1001 */
 725         2,  /* 1010 */
 726         0,  /* 1011 */
 727         1,  /* 1100 */
 728         1,  /* 1101 */
 729         0,  /* 1110 */
 730         0   /* 1111 */
 731 };
 732
 733 static inline void access_errorcf(unsigned int fs, struct frame *fp)
 734 {
 735         unsigned long mmusr, addr;
 736         unsigned int err_code;
 737         int need_page_fault;
 738
 739         mmusr = mmu_read(MMUSR);
 740         addr = mmu_read(MMUAR);
 741
 742         /*
 743          * error_code:
 744          *      bit 0 == 0 means no page found, 1 means protection fault
 745          *      bit 1 == 0 means read, 1 means write
 746          */
 747         switch (fs) {
 748         case  5:  /* 0101 TLB opword X miss */
 749                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0);
 750                 addr = fp->ptregs.pc;
 751                 break;
 752         case  6:  /* 0110 TLB extension word X miss */
 753                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1);
 754                 addr = fp->ptregs.pc + sizeof(long);
 755                 break;
 756         case 10:  /* 1010 TLB W miss */
 757                 need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0);
 758                 break;
 759         case 14: /* 1110 TLB R miss */
 760                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0);
 761                 break;
 762         default:
 763                 /* 0000 Normal  */
 764                 /* 0001 Reserved */
 765                 /* 0010 Interrupt during debug service routine */
 766                 /* 0011 Reserved */
 767                 /* 0100 X Protection */
 768                 /* 0111 IFP in emulator mode */
 769                 /* 1000 W Protection*/
 770                 /* 1001 Write error*/
 771                 /* 1011 Reserved*/
 772                 /* 1100 R Protection*/
 773                 /* 1101 R Protection*/
 774                 /* 1111 OEP in emulator mode*/
 775                 need_page_fault = 1;
 776                 break;
 777         }
 778
 779         if (need_page_fault) {
 780                 err_code = fs_err_code[fs];
 781                 if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */
 782                         err_code |= 2; /* bit1 - write, bit0 - protection */
 783                 do_page_fault(&fp->ptregs, addr, err_code);
 784         }
 785 }
 786 #endif /* CONFIG_COLDFIRE CONFIG_MMU */
 787
 788 asmlinkage void buserr_c(struct frame *fp)
 789 {
 790         /* Only set esp0 if coming from user mode */
 791         if (user_mode(&fp->ptregs))
 792                 current->thread.esp0 = (unsigned long) fp;
 793
 794 #ifdef DEBUG
 795         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 796 #endif
 797
 798 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
 799         if (CPU_IS_COLDFIRE) {
 800                 unsigned int fs;
 801                 fs = (fp->ptregs.vector & 0x3) |
 802                         ((fp->ptregs.vector & 0xc00) >> 8);
 803                 switch (fs) {
 804                 case 0x5:
 805                 case 0x6:
 806                 case 0x7:
 807                 case 0x9:
 808                 case 0xa:
 809                 case 0xd:
 810                 case 0xe:
 811                 case 0xf:
 812                         access_errorcf(fs, fp);
 813                         return;
 814                 default:
 815                         break;
 816                 }
 817         }
 818 #endif /* CONFIG_COLDFIRE && CONFIG_MMU */
 819
 820         switch (fp->ptregs.format) {
 821 #if defined (CONFIG_M68060)
 822         case 4:                         /* 68060 access error */
 823           access_error060 (fp);
 824           break;
 825 #endif
 826 #if defined (CONFIG_M68040)
 827         case 0x7:                       /* 68040 access error */
 828           access_error040 (fp);
 829           break;
 830 #endif
 831 #if defined (CPU_M68020_OR_M68030)
 832         case 0xa:
 833         case 0xb:
 834           bus_error030 (fp);
 835           break;
 836 #endif
 837         default:
 838           die_if_kernel("bad frame format",&fp->ptregs,0);
 839 #ifdef DEBUG
 840           printk("Unknown SIGSEGV - 4\n");
 841 #endif
 842           force_sig(SIGSEGV, current);
 843         }
 844 }
 845
 846
 847 static int kstack_depth_to_print = 48;
 848
 849 void show_trace(unsigned long *stack)
 850 {
 851         unsigned long *endstack;
 852         unsigned long addr;
 853         int i;
 854
 855         printk("Call Trace:");
 856         addr = (unsigned long)stack + THREAD_SIZE - 1;
 857         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 858         i = 0;
 859         while (stack + 1 <= endstack) {
 860                 addr = *stack++;
 861                 /*
 862                  * If the address is either in the text segment of the
 863                  * kernel, or in the region which contains vmalloc'ed
 864                  * memory, it *may* be the address of a calling
 865                  * routine; if so, print it so that someone tracing
 866                  * down the cause of the crash will be able to figure
 867                  * out the call path that was taken.
 868                  */
 869                 if (__kernel_text_address(addr)) {
 870 #ifndef CONFIG_KALLSYMS
 871                         if (i % 5 == 0)
 872                                 printk("\n       ");
 873 #endif
 874                         printk(" [<%08lx>] %pS\n", addr, (void *)addr);
 875                         i++;
 876                 }
 877         }
 878         printk("\n");
 879 }
 880
 881 void show_registers(struct pt_regs *regs)
 882 {
 883         struct frame *fp = (struct frame *)regs;
 884         mm_segment_t old_fs = get_fs();
 885         u16 c, *cp;
 886         unsigned long addr;
 887         int i;
 888
 889         print_modules();
 890         printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
 891         printk("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
 892         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 893                regs->d0, regs->d1, regs->d2, regs->d3);
 894         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 895                regs->d4, regs->d5, regs->a0, regs->a1);
 896
 897         printk("Process %s (pid: %d, task=%p)\n",
 898                 current->comm, task_pid_nr(current), current);
 899         addr = (unsigned long)&fp->un;
 900         printk("Frame format=%X ", regs->format);
 901         switch (regs->format) {
 902         case 0x2:
 903                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 904                 addr += sizeof(fp->un.fmt2);
 905                 break;
 906         case 0x3:
 907                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 908                 addr += sizeof(fp->un.fmt3);
 909                 break;
 910         case 0x4:
 911                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
 912                         : "eff addr=%08lx pc=%08lx\n"),
 913                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 914                 addr += sizeof(fp->un.fmt4);
 915                 break;
 916         case 0x7:
 917                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 918                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 919                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 920                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 921                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 922                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 923                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 924                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 925                 printk("push data: %08lx %08lx %08lx %08lx\n",
 926                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 927                         fp->un.fmt7.pd3);
 928                 addr += sizeof(fp->un.fmt7);
 929                 break;
 930         case 0x9:
 931                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 932                 addr += sizeof(fp->un.fmt9);
 933                 break;
 934         case 0xa:
 935                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 936                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 937                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 938                 addr += sizeof(fp->un.fmta);
 939                 break;
 940         case 0xb:
 941                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 942                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 943                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 944                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
 945                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 946                 addr += sizeof(fp->un.fmtb);
 947                 break;
 948         default:
 949                 printk("\n");
 950         }
 951         show_stack(NULL, (unsigned long *)addr);
 952
 953         printk("Code:");
 954         set_fs(KERNEL_DS);
 955         cp = (u16 *)regs->pc;
 956         for (i = -8; i < 16; i++) {
 957                 if (get_user(c, cp + i) && i >= 0) {
 958                         printk(" Bad PC value.");
 959                         break;
 960                 }
 961                 printk(i ? " %04x" : " <%04x>", c);
 962         }
 963         set_fs(old_fs);
 964         printk ("\n");
 965 }
 966
 967 void show_stack(struct task_struct *task, unsigned long *stack)
 968 {
 969         unsigned long *p;
 970         unsigned long *endstack;
 971         int i;
 972
 973         if (!stack) {
 974                 if (task)
 975                         stack = (unsigned long *)task->thread.esp0;
 976                 else
 977                         stack = (unsigned long *)&stack;
 978         }
 979         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 980
 981         printk("Stack from %08lx:", (unsigned long)stack);
 982         p = stack;
 983         for (i = 0; i < kstack_depth_to_print; i++) {
 984                 if (p + 1 > endstack)
 985                         break;
 986                 if (i % 8 == 0)
 987                         printk("\n       ");
 988                 printk(" %08lx", *p++);
 989         }
 990         printk("\n");
 991         show_trace(stack);
 992 }
 993
 994 /*
 995  * The architecture-independent backtrace generator
 996  */
 997 void dump_stack(void)
 998 {
 999         unsigned long stack;
1000
1001         show_trace(&stack);
1002 }
1003
1004 EXPORT_SYMBOL(dump_stack);
1005
1006 /*
1007  * The vector number returned in the frame pointer may also contain
1008  * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
1009  * 2 bits, and upper 2 bits. So we need to mask out the real vector
1010  * number before using it in comparisons. You don't need to do this on
1011  * real 68k parts, but it won't hurt either.
1012  */
1013
1014 void bad_super_trap (struct frame *fp)
1015 {
1016         int vector = (fp->ptregs.vector >> 2) & 0xff;
1017
1018         console_verbose();
1019         if (vector < ARRAY_SIZE(vec_names))
1020                 printk ("*** %s ***   FORMAT=%X\n",
1021                         vec_names[vector],
1022                         fp->ptregs.format);
1023         else
1024                 printk ("*** Exception %d ***   FORMAT=%X\n",
1025                         vector, fp->ptregs.format);
1026         if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
1027                 unsigned short ssw = fp->un.fmtb.ssw;
1028
1029                 printk ("SSW=%#06x  ", ssw);
1030
1031                 if (ssw & RC)
1032                         printk ("Pipe stage C instruction fault at %#010lx\n",
1033                                 (fp->ptregs.format) == 0xA ?
1034                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1035                 if (ssw & RB)
1036                         printk ("Pipe stage B instruction fault at %#010lx\n",
1037                                 (fp->ptregs.format) == 0xA ?
1038                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1039                 if (ssw & DF)
1040                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1041                                 ssw & RW ? "read" : "write",
1042                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1043                                 fp->ptregs.pc);
1044         }
1045         printk ("Current process id is %d\n", task_pid_nr(current));
1046         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1047 }
1048
1049 asmlinkage void trap_c(struct frame *fp)
1050 {
1051         int sig;
1052         int vector = (fp->ptregs.vector >> 2) & 0xff;
1053         siginfo_t info;
1054
1055         if (fp->ptregs.sr & PS_S) {
1056                 if (vector == VEC_TRACE) {
1057                         /* traced a trapping instruction on a 68020/30,
1058                          * real exception will be executed afterwards.
1059                          */
1060                 } else if (!handle_kernel_fault(&fp->ptregs))
1061                         bad_super_trap(fp);
1062                 return;
1063         }
1064
1065         /* send the appropriate signal to the user program */
1066         switch (vector) {
1067             case VEC_ADDRERR:
1068                 info.si_code = BUS_ADRALN;
1069                 sig = SIGBUS;
1070                 break;
1071             case VEC_ILLEGAL:
1072             case VEC_LINE10:
1073             case VEC_LINE11:
1074                 info.si_code = ILL_ILLOPC;
1075                 sig = SIGILL;
1076                 break;
1077             case VEC_PRIV:
1078                 info.si_code = ILL_PRVOPC;
1079                 sig = SIGILL;
1080                 break;
1081             case VEC_COPROC:
1082                 info.si_code = ILL_COPROC;
1083                 sig = SIGILL;
1084                 break;
1085             case VEC_TRAP1:
1086             case VEC_TRAP2:
1087             case VEC_TRAP3:
1088             case VEC_TRAP4:
1089             case VEC_TRAP5:
1090             case VEC_TRAP6:
1091             case VEC_TRAP7:
1092             case VEC_TRAP8:
1093             case VEC_TRAP9:
1094             case VEC_TRAP10:
1095             case VEC_TRAP11:
1096             case VEC_TRAP12:
1097             case VEC_TRAP13:
1098             case VEC_TRAP14:
1099                 info.si_code = ILL_ILLTRP;
1100                 sig = SIGILL;
1101                 break;
1102             case VEC_FPBRUC:
1103             case VEC_FPOE:
1104             case VEC_FPNAN:
1105                 info.si_code = FPE_FLTINV;
1106                 sig = SIGFPE;
1107                 break;
1108             case VEC_FPIR:
1109                 info.si_code = FPE_FLTRES;
1110                 sig = SIGFPE;
1111                 break;
1112             case VEC_FPDIVZ:
1113                 info.si_code = FPE_FLTDIV;
1114                 sig = SIGFPE;
1115                 break;
1116             case VEC_FPUNDER:
1117                 info.si_code = FPE_FLTUND;
1118                 sig = SIGFPE;
1119                 break;
1120             case VEC_FPOVER:
1121                 info.si_code = FPE_FLTOVF;
1122                 sig = SIGFPE;
1123                 break;
1124             case VEC_ZERODIV:
1125                 info.si_code = FPE_INTDIV;
1126                 sig = SIGFPE;
1127                 break;
1128             case VEC_CHK:
1129             case VEC_TRAP:
1130                 info.si_code = FPE_INTOVF;
1131                 sig = SIGFPE;
1132                 break;
1133             case VEC_TRACE:             /* ptrace single step */
1134                 info.si_code = TRAP_TRACE;
1135                 sig = SIGTRAP;
1136                 break;
1137             case VEC_TRAP15:            /* breakpoint */
1138                 info.si_code = TRAP_BRKPT;
1139                 sig = SIGTRAP;
1140                 break;
1141             default:
1142                 info.si_code = ILL_ILLOPC;
1143                 sig = SIGILL;
1144                 break;
1145         }
1146         info.si_signo = sig;
1147         info.si_errno = 0;
1148         switch (fp->ptregs.format) {
1149             default:
1150                 info.si_addr = (void *) fp->ptregs.pc;
1151                 break;
1152             case 2:
1153                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1154                 break;
1155             case 7:
1156                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1157                 break;
1158             case 9:
1159                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1160                 break;
1161             case 10:
1162                 info.si_addr = (void *) fp->un.fmta.daddr;
1163                 break;
1164             case 11:
1165                 info.si_addr = (void *) fp->un.fmtb.daddr;
1166                 break;
1167         }
1168         force_sig_info (sig, &info, current);
1169 }
1170
1171 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1172 {
1173         if (!(fp->sr & PS_S))
1174                 return;
1175
1176         console_verbose();
1177         printk("%s: %08x\n",str,nr);
1178         show_registers(fp);
1179         add_taint(TAINT_DIE);
1180         do_exit(SIGSEGV);
1181 }
1182
1183 asmlinkage void set_esp0(unsigned long ssp)
1184 {
1185         current->thread.esp0 = ssp;
1186 }
1187
1188 /*
1189  * This function is called if an error occur while accessing
1190  * user-space from the fpsp040 code.
1191  */
1192 asmlinkage void fpsp040_die(void)
1193 {
1194         do_exit(SIGSEGV);
1195 }
1196
1197 #ifdef CONFIG_M68KFPU_EMU
1198 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1199 {
1200         siginfo_t info;
1201
1202         info.si_signo = signal;
1203         info.si_errno = 0;
1204         info.si_code = code;
1205         info.si_addr = addr;
1206         force_sig_info(signal, &info, current);
1207 }
1208 #endif