arch/m68k/kernel/traps.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
access_error060
probe040
do_040writeback1
fix_xframe040
do_040writebacks
berr_040cleanup
access_error040
bus_error030
bus_error030
access_errorcf
buserr_c
show_trace
show_registers
show_stack
bad_super_trap
trap_c
die_if_kernel
set_esp0
fpsp040_die
fpemu_signal
   1 /*
   2  *  linux/arch/m68k/kernel/traps.c
   3  *
   4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
   5  *
   6  *  68040 fixes by Michael Rausch
   7  *  68040 fixes by Martin Apel
   8  *  68040 fixes and writeback by Richard Zidlicky
   9  *  68060 fixes by Roman Hodek
  10  *  68060 fixes by Jesper Skov
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16 
  17 /*
  18  * Sets up all exception vectors
  19  */
  20 
  21 #include <linux/sched.h>
  22 #include <linux/sched/debug.h>
  23 #include <linux/signal.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/module.h>
  27 #include <linux/user.h>
  28 #include <linux/string.h>
  29 #include <linux/linkage.h>
  30 #include <linux/init.h>
  31 #include <linux/ptrace.h>
  32 #include <linux/kallsyms.h>
  33 
  34 #include <asm/setup.h>
  35 #include <asm/fpu.h>
  36 #include <linux/uaccess.h>
  37 #include <asm/traps.h>
  38 #include <asm/pgalloc.h>
  39 #include <asm/machdep.h>
  40 #include <asm/siginfo.h>
  41 
  42 
  43 static const char *vec_names[] = {
  44         [VEC_RESETSP]   = "RESET SP",
  45         [VEC_RESETPC]   = "RESET PC",
  46         [VEC_BUSERR]    = "BUS ERROR",
  47         [VEC_ADDRERR]   = "ADDRESS ERROR",
  48         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
  49         [VEC_ZERODIV]   = "ZERO DIVIDE",
  50         [VEC_CHK]       = "CHK",
  51         [VEC_TRAP]      = "TRAPcc",
  52         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
  53         [VEC_TRACE]     = "TRACE",
  54         [VEC_LINE10]    = "LINE 1010",
  55         [VEC_LINE11]    = "LINE 1111",
  56         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
  57         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
  58         [VEC_FORMAT]    = "FORMAT ERROR",
  59         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
  60         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
  61         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
  62         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
  63         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
  64         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
  65         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
  66         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
  67         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
  68         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
  69         [VEC_INT1]      = "LEVEL 1 INT",
  70         [VEC_INT2]      = "LEVEL 2 INT",
  71         [VEC_INT3]      = "LEVEL 3 INT",
  72         [VEC_INT4]      = "LEVEL 4 INT",
  73         [VEC_INT5]      = "LEVEL 5 INT",
  74         [VEC_INT6]      = "LEVEL 6 INT",
  75         [VEC_INT7]      = "LEVEL 7 INT",
  76         [VEC_SYS]       = "SYSCALL",
  77         [VEC_TRAP1]     = "TRAP #1",
  78         [VEC_TRAP2]     = "TRAP #2",
  79         [VEC_TRAP3]     = "TRAP #3",
  80         [VEC_TRAP4]     = "TRAP #4",
  81         [VEC_TRAP5]     = "TRAP #5",
  82         [VEC_TRAP6]     = "TRAP #6",
  83         [VEC_TRAP7]     = "TRAP #7",
  84         [VEC_TRAP8]     = "TRAP #8",
  85         [VEC_TRAP9]     = "TRAP #9",
  86         [VEC_TRAP10]    = "TRAP #10",
  87         [VEC_TRAP11]    = "TRAP #11",
  88         [VEC_TRAP12]    = "TRAP #12",
  89         [VEC_TRAP13]    = "TRAP #13",
  90         [VEC_TRAP14]    = "TRAP #14",
  91         [VEC_TRAP15]    = "TRAP #15",
  92         [VEC_FPBRUC]    = "FPCP BSUN",
  93         [VEC_FPIR]      = "FPCP INEXACT",
  94         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
  95         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
  96         [VEC_FPOE]      = "FPCP OPERAND ERROR",
  97         [VEC_FPOVER]    = "FPCP OVERFLOW",
  98         [VEC_FPNAN]     = "FPCP SNAN",
  99         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
 100         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
 101         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
 102         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
 103         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
 104         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
 105         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
 106         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
 107         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
 108 };
 109 
 110 static const char *space_names[] = {
 111         [0]             = "Space 0",
 112         [USER_DATA]     = "User Data",
 113         [USER_PROGRAM]  = "User Program",
 114 #ifndef CONFIG_SUN3
 115         [3]             = "Space 3",
 116 #else
 117         [FC_CONTROL]    = "Control",
 118 #endif
 119         [4]             = "Space 4",
 120         [SUPER_DATA]    = "Super Data",
 121         [SUPER_PROGRAM] = "Super Program",
 122         [CPU_SPACE]     = "CPU"
 123 };
 124 
 125 void die_if_kernel(char *,struct pt_regs *,int);
 126 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 127                              unsigned long error_code);
 128 int send_fault_sig(struct pt_regs *regs);
 129 
 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         mm_segment_t old_fs = get_fs();
 186 
 187         set_fs(MAKE_MM_SEG(wbs));
 188 
 189         if (iswrite)
 190                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
 191         else
 192                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
 193 
 194         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
 195 
 196         set_fs(old_fs);
 197 
 198         return mmusr;
 199 }
 200 
 201 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
 202                                    unsigned long wbd)
 203 {
 204         int res = 0;
 205         mm_segment_t old_fs = get_fs();
 206 
 207         /* set_fs can not be moved, otherwise put_user() may oops */
 208         set_fs(MAKE_MM_SEG(wbs));
 209 
 210         switch (wbs & WBSIZ_040) {
 211         case BA_SIZE_BYTE:
 212                 res = put_user(wbd & 0xff, (char __user *)wba);
 213                 break;
 214         case BA_SIZE_WORD:
 215                 res = put_user(wbd & 0xffff, (short __user *)wba);
 216                 break;
 217         case BA_SIZE_LONG:
 218                 res = put_user(wbd, (int __user *)wba);
 219                 break;
 220         }
 221 
 222         /* set_fs can not be moved, otherwise put_user() may oops */
 223         set_fs(old_fs);
 224 
 225 
 226         pr_debug("do_040writeback1, res=%d\n", res);
 227 
 228         return res;
 229 }
 230 
 231 /* after an exception in a writeback the stack frame corresponding
 232  * to that exception is discarded, set a few bits in the old frame
 233  * to simulate what it should look like
 234  */
 235 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
 236 {
 237         fp->un.fmt7.faddr = wba;
 238         fp->un.fmt7.ssw = wbs & 0xff;
 239         if (wba != current->thread.faddr)
 240             fp->un.fmt7.ssw |= MA_040;
 241 }
 242 
 243 static inline void do_040writebacks(struct frame *fp)
 244 {
 245         int res = 0;
 246 #if 0
 247         if (fp->un.fmt7.wb1s & WBV_040)
 248                 pr_err("access_error040: cannot handle 1st writeback. oops.\n");
 249 #endif
 250 
 251         if ((fp->un.fmt7.wb2s & WBV_040) &&
 252             !(fp->un.fmt7.wb2s & WBTT_040)) {
 253                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
 254                                        fp->un.fmt7.wb2d);
 255                 if (res)
 256                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
 257                 else
 258                         fp->un.fmt7.wb2s = 0;
 259         }
 260 
 261         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
 262         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
 263                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
 264                                        fp->un.fmt7.wb3d);
 265                 if (res)
 266                     {
 267                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
 268 
 269                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
 270                         fp->un.fmt7.wb3s &= (~WBV_040);
 271                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
 272                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
 273                     }
 274                 else
 275                         fp->un.fmt7.wb3s = 0;
 276         }
 277 
 278         if (res)
 279                 send_fault_sig(&fp->ptregs);
 280 }
 281 
 282 /*
 283  * called from sigreturn(), must ensure userspace code didn't
 284  * manipulate exception frame to circumvent protection, then complete
 285  * pending writebacks
 286  * we just clear TM2 to turn it into a userspace access
 287  */
 288 asmlinkage void berr_040cleanup(struct frame *fp)
 289 {
 290         fp->un.fmt7.wb2s &= ~4;
 291         fp->un.fmt7.wb3s &= ~4;
 292 
 293         do_040writebacks(fp);
 294 }
 295 
 296 static inline void access_error040(struct frame *fp)
 297 {
 298         unsigned short ssw = fp->un.fmt7.ssw;
 299         unsigned long mmusr;
 300 
 301         pr_debug("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
 302         pr_debug("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
 303                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
 304         pr_debug("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
 305                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
 306                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
 307 
 308         if (ssw & ATC_040) {
 309                 unsigned long addr = fp->un.fmt7.faddr;
 310                 unsigned long errorcode;
 311 
 312                 /*
 313                  * The MMU status has to be determined AFTER the address
 314                  * has been corrected if there was a misaligned access (MA).
 315                  */
 316                 if (ssw & MA_040)
 317                         addr = (addr + 7) & -8;
 318 
 319                 /* MMU error, get the MMUSR info for this access */
 320                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
 321                 pr_debug("mmusr = %lx\n", mmusr);
 322                 errorcode = 1;
 323                 if (!(mmusr & MMU_R_040)) {
 324                         /* clear the invalid atc entry */
 325                         __flush_tlb040_one(addr);
 326                         errorcode = 0;
 327                 }
 328 
 329                 /* despite what documentation seems to say, RMW
 330                  * accesses have always both the LK and RW bits set */
 331                 if (!(ssw & RW_040) || (ssw & LK_040))
 332                         errorcode |= 2;
 333 
 334                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
 335                         pr_debug("do_page_fault() !=0\n");
 336                         if (user_mode(&fp->ptregs)){
 337                                 /* delay writebacks after signal delivery */
 338                                 pr_debug(".. was usermode - return\n");
 339                                 return;
 340                         }
 341                         /* disable writeback into user space from kernel
 342                          * (if do_page_fault didn't fix the mapping,
 343                          * the writeback won't do good)
 344                          */
 345 disable_wb:
 346                         pr_debug(".. disabling wb2\n");
 347                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
 348                                 fp->un.fmt7.wb2s &= ~WBV_040;
 349                         if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
 350                                 fp->un.fmt7.wb3s &= ~WBV_040;
 351                 }
 352         } else {
 353                 /* In case of a bus error we either kill the process or expect
 354                  * the kernel to catch the fault, which then is also responsible
 355                  * for cleaning up the mess.
 356                  */
 357                 current->thread.signo = SIGBUS;
 358                 current->thread.faddr = fp->un.fmt7.faddr;
 359                 if (send_fault_sig(&fp->ptregs) >= 0)
 360                         pr_err("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
 361                                fp->un.fmt7.faddr);
 362                 goto disable_wb;
 363         }
 364 
 365         do_040writebacks(fp);
 366 }
 367 #endif /* CONFIG_M68040 */
 368 
 369 #if defined(CONFIG_SUN3)
 370 #include <asm/sun3mmu.h>
 371 
 372 extern int mmu_emu_handle_fault (unsigned long, int, int);
 373 
 374 /* sun3 version of bus_error030 */
 375 
 376 static inline void bus_error030 (struct frame *fp)
 377 {
 378         unsigned char buserr_type = sun3_get_buserr ();
 379         unsigned long addr, errorcode;
 380         unsigned short ssw = fp->un.fmtb.ssw;
 381         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
 382 
 383         if (ssw & (FC | FB))
 384                 pr_debug("Instruction fault at %#010lx\n",
 385                         ssw & FC ?
 386                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 387                         :
 388                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 389         if (ssw & DF)
 390                 pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 391                         ssw & RW ? "read" : "write",
 392                         fp->un.fmtb.daddr,
 393                         space_names[ssw & DFC], fp->ptregs.pc);
 394 
 395         /*
 396          * Check if this page should be demand-mapped. This needs to go before
 397          * the testing for a bad kernel-space access (demand-mapping applies
 398          * to kernel accesses too).
 399          */
 400 
 401         if ((ssw & DF)
 402             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
 403                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
 404                         return;
 405         }
 406 
 407         /* Check for kernel-space pagefault (BAD). */
 408         if (fp->ptregs.sr & PS_S) {
 409                 /* kernel fault must be a data fault to user space */
 410                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
 411                      // try checking the kernel mappings before surrender
 412                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
 413                           return;
 414                         /* instruction fault or kernel data fault! */
 415                         if (ssw & (FC | FB))
 416                                 pr_err("Instruction fault at %#010lx\n",
 417                                         fp->ptregs.pc);
 418                         if (ssw & DF) {
 419                                 /* was this fault incurred testing bus mappings? */
 420                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
 421                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
 422                                         send_fault_sig(&fp->ptregs);
 423                                         return;
 424                                 }
 425 
 426                                 pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 427                                         ssw & RW ? "read" : "write",
 428                                         fp->un.fmtb.daddr,
 429                                         space_names[ssw & DFC], fp->ptregs.pc);
 430                         }
 431                         pr_err("BAD KERNEL BUSERR\n");
 432 
 433                         die_if_kernel("Oops", &fp->ptregs,0);
 434                         force_sig(SIGKILL);
 435                         return;
 436                 }
 437         } else {
 438                 /* user fault */
 439                 if (!(ssw & (FC | FB)) && !(ssw & DF))
 440                         /* not an instruction fault or data fault! BAD */
 441                         panic ("USER BUSERR w/o instruction or data fault");
 442         }
 443 
 444 
 445         /* First handle the data fault, if any.  */
 446         if (ssw & DF) {
 447                 addr = fp->un.fmtb.daddr;
 448 
 449 // errorcode bit 0:     0 -> no page            1 -> protection fault
 450 // errorcode bit 1:     0 -> read fault         1 -> write fault
 451 
 452 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
 453 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
 454 
 455                 if (buserr_type & SUN3_BUSERR_PROTERR)
 456                         errorcode = 0x01;
 457                 else if (buserr_type & SUN3_BUSERR_INVALID)
 458                         errorcode = 0x00;
 459                 else {
 460                         pr_debug("*** unexpected busfault type=%#04x\n",
 461                                  buserr_type);
 462                         pr_debug("invalid %s access at %#lx from pc %#lx\n",
 463                                  !(ssw & RW) ? "write" : "read", addr,
 464                                  fp->ptregs.pc);
 465                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 466                         force_sig (SIGBUS);
 467                         return;
 468                 }
 469 
 470 //todo: wtf is RM bit? --m
 471                 if (!(ssw & RW) || ssw & RM)
 472                         errorcode |= 0x02;
 473 
 474                 /* Handle page fault. */
 475                 do_page_fault (&fp->ptregs, addr, errorcode);
 476 
 477                 /* Retry the data fault now. */
 478                 return;
 479         }
 480 
 481         /* Now handle the instruction fault. */
 482 
 483         /* Get the fault address. */
 484         if (fp->ptregs.format == 0xA)
 485                 addr = fp->ptregs.pc + 4;
 486         else
 487                 addr = fp->un.fmtb.baddr;
 488         if (ssw & FC)
 489                 addr -= 2;
 490 
 491         if (buserr_type & SUN3_BUSERR_INVALID) {
 492                 if (!mmu_emu_handle_fault(addr, 1, 0))
 493                         do_page_fault (&fp->ptregs, addr, 0);
 494        } else {
 495                 pr_debug("protection fault on insn access (segv).\n");
 496                 force_sig (SIGSEGV);
 497        }
 498 }
 499 #else
 500 #if defined(CPU_M68020_OR_M68030)
 501 static inline void bus_error030 (struct frame *fp)
 502 {
 503         volatile unsigned short temp;
 504         unsigned short mmusr;
 505         unsigned long addr, errorcode;
 506         unsigned short ssw = fp->un.fmtb.ssw;
 507 #ifdef DEBUG
 508         unsigned long desc;
 509 #endif
 510 
 511         pr_debug("pid = %x  ", current->pid);
 512         pr_debug("SSW=%#06x  ", ssw);
 513 
 514         if (ssw & (FC | FB))
 515                 pr_debug("Instruction fault at %#010lx\n",
 516                         ssw & FC ?
 517                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
 518                         :
 519                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 520         if (ssw & DF)
 521                 pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 522                         ssw & RW ? "read" : "write",
 523                         fp->un.fmtb.daddr,
 524                         space_names[ssw & DFC], fp->ptregs.pc);
 525 
 526         /* ++andreas: If a data fault and an instruction fault happen
 527            at the same time map in both pages.  */
 528 
 529         /* First handle the data fault, if any.  */
 530         if (ssw & DF) {
 531                 addr = fp->un.fmtb.daddr;
 532 
 533 #ifdef DEBUG
 534                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
 535                               "pmove %%psr,%1"
 536                               : "=a&" (desc), "=m" (temp)
 537                               : "a" (addr), "d" (ssw));
 538                 pr_debug("mmusr is %#x for addr %#lx in task %p\n",
 539                          temp, addr, current);
 540                 pr_debug("descriptor address is 0x%p, contents %#lx\n",
 541                          __va(desc), *(unsigned long *)__va(desc));
 542 #else
 543                 asm volatile ("ptestr %2,%1@,#7\n\t"
 544                               "pmove %%psr,%0"
 545                               : "=m" (temp) : "a" (addr), "d" (ssw));
 546 #endif
 547                 mmusr = temp;
 548                 errorcode = (mmusr & MMU_I) ? 0 : 1;
 549                 if (!(ssw & RW) || (ssw & RM))
 550                         errorcode |= 2;
 551 
 552                 if (mmusr & (MMU_I | MMU_WP)) {
 553                         if (ssw & 4) {
 554                                 pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 555                                        ssw & RW ? "read" : "write",
 556                                        fp->un.fmtb.daddr,
 557                                        space_names[ssw & DFC], fp->ptregs.pc);
 558                                 goto buserr;
 559                         }
 560                         /* Don't try to do anything further if an exception was
 561                            handled. */
 562                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
 563                                 return;
 564                 } else if (!(mmusr & MMU_I)) {
 565                         /* probably a 020 cas fault */
 566                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
 567                                 pr_err("unexpected bus error (%#x,%#x)\n", ssw,
 568                                        mmusr);
 569                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 570                         pr_err("invalid %s access at %#lx from pc %#lx\n",
 571                                !(ssw & RW) ? "write" : "read", addr,
 572                                fp->ptregs.pc);
 573                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 574                         force_sig(SIGSEGV);
 575                         return;
 576                 } else {
 577 #if 0
 578                         static volatile long tlong;
 579 #endif
 580 
 581                         pr_err("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
 582                                !(ssw & RW) ? "write" : "read", addr,
 583                                fp->ptregs.pc, ssw);
 584                         asm volatile ("ptestr #1,%1@,#0\n\t"
 585                                       "pmove %%psr,%0"
 586                                       : "=m" (temp)
 587                                       : "a" (addr));
 588                         mmusr = temp;
 589 
 590                         pr_err("level 0 mmusr is %#x\n", mmusr);
 591 #if 0
 592                         asm volatile ("pmove %%tt0,%0"
 593                                       : "=m" (tlong));
 594                         pr_debug("tt0 is %#lx, ", tlong);
 595                         asm volatile ("pmove %%tt1,%0"
 596                                       : "=m" (tlong));
 597                         pr_debug("tt1 is %#lx\n", tlong);
 598 #endif
 599                         pr_debug("Unknown SIGSEGV - 1\n");
 600                         die_if_kernel("Oops",&fp->ptregs,mmusr);
 601                         force_sig(SIGSEGV);
 602                         return;
 603                 }
 604 
 605                 /* setup an ATC entry for the access about to be retried */
 606                 if (!(ssw & RW) || (ssw & RM))
 607                         asm volatile ("ploadw %1,%0@" : /* no outputs */
 608                                       : "a" (addr), "d" (ssw));
 609                 else
 610                         asm volatile ("ploadr %1,%0@" : /* no outputs */
 611                                       : "a" (addr), "d" (ssw));
 612         }
 613 
 614         /* Now handle the instruction fault. */
 615 
 616         if (!(ssw & (FC|FB)))
 617                 return;
 618 
 619         if (fp->ptregs.sr & PS_S) {
 620                 pr_err("Instruction fault at %#010lx\n", fp->ptregs.pc);
 621         buserr:
 622                 pr_err("BAD KERNEL BUSERR\n");
 623                 die_if_kernel("Oops",&fp->ptregs,0);
 624                 force_sig(SIGKILL);
 625                 return;
 626         }
 627 
 628         /* get the fault address */
 629         if (fp->ptregs.format == 10)
 630                 addr = fp->ptregs.pc + 4;
 631         else
 632                 addr = fp->un.fmtb.baddr;
 633         if (ssw & FC)
 634                 addr -= 2;
 635 
 636         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
 637                 /* Insn fault on same page as data fault.  But we
 638                    should still create the ATC entry.  */
 639                 goto create_atc_entry;
 640 
 641 #ifdef DEBUG
 642         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
 643                       "pmove %%psr,%1"
 644                       : "=a&" (desc), "=m" (temp)
 645                       : "a" (addr));
 646         pr_debug("mmusr is %#x for addr %#lx in task %p\n",
 647                 temp, addr, current);
 648         pr_debug("descriptor address is 0x%p, contents %#lx\n",
 649                 __va(desc), *(unsigned long *)__va(desc));
 650 #else
 651         asm volatile ("ptestr #1,%1@,#7\n\t"
 652                       "pmove %%psr,%0"
 653                       : "=m" (temp) : "a" (addr));
 654 #endif
 655         mmusr = temp;
 656         if (mmusr & MMU_I)
 657                 do_page_fault (&fp->ptregs, addr, 0);
 658         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 659                 pr_err("invalid insn access at %#lx from pc %#lx\n",
 660                         addr, fp->ptregs.pc);
 661                 pr_debug("Unknown SIGSEGV - 2\n");
 662                 die_if_kernel("Oops",&fp->ptregs,mmusr);
 663                 force_sig(SIGSEGV);
 664                 return;
 665         }
 666 
 667 create_atc_entry:
 668         /* setup an ATC entry for the access about to be retried */
 669         asm volatile ("ploadr #2,%0@" : /* no outputs */
 670                       : "a" (addr));
 671 }
 672 #endif /* CPU_M68020_OR_M68030 */
 673 #endif /* !CONFIG_SUN3 */
 674 
 675 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
 676 #include <asm/mcfmmu.h>
 677 
 678 /*
 679  *      The following table converts the FS encoding of a ColdFire
 680  *      exception stack frame into the error_code value needed by
 681  *      do_fault.
 682 */
 683 static const unsigned char fs_err_code[] = {
 684         0,  /* 0000 */
 685         0,  /* 0001 */
 686         0,  /* 0010 */
 687         0,  /* 0011 */
 688         1,  /* 0100 */
 689         0,  /* 0101 */
 690         0,  /* 0110 */
 691         0,  /* 0111 */
 692         2,  /* 1000 */
 693         3,  /* 1001 */
 694         2,  /* 1010 */
 695         0,  /* 1011 */
 696         1,  /* 1100 */
 697         1,  /* 1101 */
 698         0,  /* 1110 */
 699         0   /* 1111 */
 700 };
 701 
 702 static inline void access_errorcf(unsigned int fs, struct frame *fp)
 703 {
 704         unsigned long mmusr, addr;
 705         unsigned int err_code;
 706         int need_page_fault;
 707 
 708         mmusr = mmu_read(MMUSR);
 709         addr = mmu_read(MMUAR);
 710 
 711         /*
 712          * error_code:
 713          *      bit 0 == 0 means no page found, 1 means protection fault
 714          *      bit 1 == 0 means read, 1 means write
 715          */
 716         switch (fs) {
 717         case  5:  /* 0101 TLB opword X miss */
 718                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0);
 719                 addr = fp->ptregs.pc;
 720                 break;
 721         case  6:  /* 0110 TLB extension word X miss */
 722                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1);
 723                 addr = fp->ptregs.pc + sizeof(long);
 724                 break;
 725         case 10:  /* 1010 TLB W miss */
 726                 need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0);
 727                 break;
 728         case 14: /* 1110 TLB R miss */
 729                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0);
 730                 break;
 731         default:
 732                 /* 0000 Normal  */
 733                 /* 0001 Reserved */
 734                 /* 0010 Interrupt during debug service routine */
 735                 /* 0011 Reserved */
 736                 /* 0100 X Protection */
 737                 /* 0111 IFP in emulator mode */
 738                 /* 1000 W Protection*/
 739                 /* 1001 Write error*/
 740                 /* 1011 Reserved*/
 741                 /* 1100 R Protection*/
 742                 /* 1101 R Protection*/
 743                 /* 1111 OEP in emulator mode*/
 744                 need_page_fault = 1;
 745                 break;
 746         }
 747 
 748         if (need_page_fault) {
 749                 err_code = fs_err_code[fs];
 750                 if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */
 751                         err_code |= 2; /* bit1 - write, bit0 - protection */
 752                 do_page_fault(&fp->ptregs, addr, err_code);
 753         }
 754 }
 755 #endif /* CONFIG_COLDFIRE CONFIG_MMU */
 756 
 757 asmlinkage void buserr_c(struct frame *fp)
 758 {
 759         /* Only set esp0 if coming from user mode */
 760         if (user_mode(&fp->ptregs))
 761                 current->thread.esp0 = (unsigned long) fp;
 762 
 763         pr_debug("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 764 
 765 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
 766         if (CPU_IS_COLDFIRE) {
 767                 unsigned int fs;
 768                 fs = (fp->ptregs.vector & 0x3) |
 769                         ((fp->ptregs.vector & 0xc00) >> 8);
 770                 switch (fs) {
 771                 case 0x5:
 772                 case 0x6:
 773                 case 0x7:
 774                 case 0x9:
 775                 case 0xa:
 776                 case 0xd:
 777                 case 0xe:
 778                 case 0xf:
 779                         access_errorcf(fs, fp);
 780                         return;
 781                 default:
 782                         break;
 783                 }
 784         }
 785 #endif /* CONFIG_COLDFIRE && CONFIG_MMU */
 786 
 787         switch (fp->ptregs.format) {
 788 #if defined (CONFIG_M68060)
 789         case 4:                         /* 68060 access error */
 790           access_error060 (fp);
 791           break;
 792 #endif
 793 #if defined (CONFIG_M68040)
 794         case 0x7:                       /* 68040 access error */
 795           access_error040 (fp);
 796           break;
 797 #endif
 798 #if defined (CPU_M68020_OR_M68030)
 799         case 0xa:
 800         case 0xb:
 801           bus_error030 (fp);
 802           break;
 803 #endif
 804         default:
 805           die_if_kernel("bad frame format",&fp->ptregs,0);
 806           pr_debug("Unknown SIGSEGV - 4\n");
 807           force_sig(SIGSEGV);
 808         }
 809 }
 810 
 811 
 812 static int kstack_depth_to_print = 48;
 813 
 814 void show_trace(unsigned long *stack)
 815 {
 816         unsigned long *endstack;
 817         unsigned long addr;
 818         int i;
 819 
 820         pr_info("Call Trace:");
 821         addr = (unsigned long)stack + THREAD_SIZE - 1;
 822         endstack = (unsigned long *)(addr & -THREAD_SIZE);
 823         i = 0;
 824         while (stack + 1 <= endstack) {
 825                 addr = *stack++;
 826                 /*
 827                  * If the address is either in the text segment of the
 828                  * kernel, or in the region which contains vmalloc'ed
 829                  * memory, it *may* be the address of a calling
 830                  * routine; if so, print it so that someone tracing
 831                  * down the cause of the crash will be able to figure
 832                  * out the call path that was taken.
 833                  */
 834                 if (__kernel_text_address(addr)) {
 835 #ifndef CONFIG_KALLSYMS
 836                         if (i % 5 == 0)
 837                                 pr_cont("\n       ");
 838 #endif
 839                         pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr);
 840                         i++;
 841                 }
 842         }
 843         pr_cont("\n");
 844 }
 845 
 846 void show_registers(struct pt_regs *regs)
 847 {
 848         struct frame *fp = (struct frame *)regs;
 849         mm_segment_t old_fs = get_fs();
 850         u16 c, *cp;
 851         unsigned long addr;
 852         int i;
 853 
 854         print_modules();
 855         pr_info("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
 856         pr_info("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
 857         pr_info("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
 858                regs->d0, regs->d1, regs->d2, regs->d3);
 859         pr_info("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
 860                regs->d4, regs->d5, regs->a0, regs->a1);
 861 
 862         pr_info("Process %s (pid: %d, task=%p)\n",
 863                 current->comm, task_pid_nr(current), current);
 864         addr = (unsigned long)&fp->un;
 865         pr_info("Frame format=%X ", regs->format);
 866         switch (regs->format) {
 867         case 0x2:
 868                 pr_cont("instr addr=%08lx\n", fp->un.fmt2.iaddr);
 869                 addr += sizeof(fp->un.fmt2);
 870                 break;
 871         case 0x3:
 872                 pr_cont("eff addr=%08lx\n", fp->un.fmt3.effaddr);
 873                 addr += sizeof(fp->un.fmt3);
 874                 break;
 875         case 0x4:
 876                 if (CPU_IS_060)
 877                         pr_cont("fault addr=%08lx fslw=%08lx\n",
 878                                 fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 879                 else
 880                         pr_cont("eff addr=%08lx pc=%08lx\n",
 881                                 fp->un.fmt4.effaddr, fp->un.fmt4.pc);
 882                 addr += sizeof(fp->un.fmt4);
 883                 break;
 884         case 0x7:
 885                 pr_cont("eff addr=%08lx ssw=%04x faddr=%08lx\n",
 886                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
 887                 pr_info("wb 1 stat/addr/data: %04x %08lx %08lx\n",
 888                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
 889                 pr_info("wb 2 stat/addr/data: %04x %08lx %08lx\n",
 890                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
 891                 pr_info("wb 3 stat/addr/data: %04x %08lx %08lx\n",
 892                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
 893                 pr_info("push data: %08lx %08lx %08lx %08lx\n",
 894                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
 895                         fp->un.fmt7.pd3);
 896                 addr += sizeof(fp->un.fmt7);
 897                 break;
 898         case 0x9:
 899                 pr_cont("instr addr=%08lx\n", fp->un.fmt9.iaddr);
 900                 addr += sizeof(fp->un.fmt9);
 901                 break;
 902         case 0xa:
 903                 pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 904                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
 905                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
 906                 addr += sizeof(fp->un.fmta);
 907                 break;
 908         case 0xb:
 909                 pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
 910                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
 911                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
 912                 pr_info("baddr=%08lx dibuf=%08lx ver=%x\n",
 913                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
 914                 addr += sizeof(fp->un.fmtb);
 915                 break;
 916         default:
 917                 pr_cont("\n");
 918         }
 919         show_stack(NULL, (unsigned long *)addr);
 920 
 921         pr_info("Code:");
 922         set_fs(KERNEL_DS);
 923         cp = (u16 *)regs->pc;
 924         for (i = -8; i < 16; i++) {
 925                 if (get_user(c, cp + i) && i >= 0) {
 926                         pr_cont(" Bad PC value.");
 927                         break;
 928                 }
 929                 if (i)
 930                         pr_cont(" %04x", c);
 931                 else
 932                         pr_cont(" <%04x>", c);
 933         }
 934         set_fs(old_fs);
 935         pr_cont("\n");
 936 }
 937 
 938 void show_stack(struct task_struct *task, unsigned long *stack)
 939 {
 940         unsigned long *p;
 941         unsigned long *endstack;
 942         int i;
 943 
 944         if (!stack) {
 945                 if (task)
 946                         stack = (unsigned long *)task->thread.esp0;
 947                 else
 948                         stack = (unsigned long *)&stack;
 949         }
 950         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 951 
 952         pr_info("Stack from %08lx:", (unsigned long)stack);
 953         p = stack;
 954         for (i = 0; i < kstack_depth_to_print; i++) {
 955                 if (p + 1 > endstack)
 956                         break;
 957                 if (i % 8 == 0)
 958                         pr_cont("\n       ");
 959                 pr_cont(" %08lx", *p++);
 960         }
 961         pr_cont("\n");
 962         show_trace(stack);
 963 }
 964 
 965 /*
 966  * The vector number returned in the frame pointer may also contain
 967  * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
 968  * 2 bits, and upper 2 bits. So we need to mask out the real vector
 969  * number before using it in comparisons. You don't need to do this on
 970  * real 68k parts, but it won't hurt either.
 971  */
 972 
 973 void bad_super_trap (struct frame *fp)
 974 {
 975         int vector = (fp->ptregs.vector >> 2) & 0xff;
 976 
 977         console_verbose();
 978         if (vector < ARRAY_SIZE(vec_names))
 979                 pr_err("*** %s ***   FORMAT=%X\n",
 980                         vec_names[vector],
 981                         fp->ptregs.format);
 982         else
 983                 pr_err("*** Exception %d ***   FORMAT=%X\n",
 984                         vector, fp->ptregs.format);
 985         if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
 986                 unsigned short ssw = fp->un.fmtb.ssw;
 987 
 988                 pr_err("SSW=%#06x  ", ssw);
 989 
 990                 if (ssw & RC)
 991                         pr_err("Pipe stage C instruction fault at %#010lx\n",
 992                                 (fp->ptregs.format) == 0xA ?
 993                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
 994                 if (ssw & RB)
 995                         pr_err("Pipe stage B instruction fault at %#010lx\n",
 996                                 (fp->ptregs.format) == 0xA ?
 997                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 998                 if (ssw & DF)
 999                         pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1000                                 ssw & RW ? "read" : "write",
1001                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1002                                 fp->ptregs.pc);
1003         }
1004         pr_err("Current process id is %d\n", task_pid_nr(current));
1005         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1006 }
1007 
1008 asmlinkage void trap_c(struct frame *fp)
1009 {
1010         int sig, si_code;
1011         void __user *addr;
1012         int vector = (fp->ptregs.vector >> 2) & 0xff;
1013 
1014         if (fp->ptregs.sr & PS_S) {
1015                 if (vector == VEC_TRACE) {
1016                         /* traced a trapping instruction on a 68020/30,
1017                          * real exception will be executed afterwards.
1018                          */
1019                         return;
1020                 }
1021 #ifdef CONFIG_MMU
1022                 if (fixup_exception(&fp->ptregs))
1023                         return;
1024 #endif
1025                 bad_super_trap(fp);
1026                 return;
1027         }
1028 
1029         /* send the appropriate signal to the user program */
1030         switch (vector) {
1031             case VEC_ADDRERR:
1032                 si_code = BUS_ADRALN;
1033                 sig = SIGBUS;
1034                 break;
1035             case VEC_ILLEGAL:
1036             case VEC_LINE10:
1037             case VEC_LINE11:
1038                 si_code = ILL_ILLOPC;
1039                 sig = SIGILL;
1040                 break;
1041             case VEC_PRIV:
1042                 si_code = ILL_PRVOPC;
1043                 sig = SIGILL;
1044                 break;
1045             case VEC_COPROC:
1046                 si_code = ILL_COPROC;
1047                 sig = SIGILL;
1048                 break;
1049             case VEC_TRAP1:
1050             case VEC_TRAP2:
1051             case VEC_TRAP3:
1052             case VEC_TRAP4:
1053             case VEC_TRAP5:
1054             case VEC_TRAP6:
1055             case VEC_TRAP7:
1056             case VEC_TRAP8:
1057             case VEC_TRAP9:
1058             case VEC_TRAP10:
1059             case VEC_TRAP11:
1060             case VEC_TRAP12:
1061             case VEC_TRAP13:
1062             case VEC_TRAP14:
1063                 si_code = ILL_ILLTRP;
1064                 sig = SIGILL;
1065                 break;
1066             case VEC_FPBRUC:
1067             case VEC_FPOE:
1068             case VEC_FPNAN:
1069                 si_code = FPE_FLTINV;
1070                 sig = SIGFPE;
1071                 break;
1072             case VEC_FPIR:
1073                 si_code = FPE_FLTRES;
1074                 sig = SIGFPE;
1075                 break;
1076             case VEC_FPDIVZ:
1077                 si_code = FPE_FLTDIV;
1078                 sig = SIGFPE;
1079                 break;
1080             case VEC_FPUNDER:
1081                 si_code = FPE_FLTUND;
1082                 sig = SIGFPE;
1083                 break;
1084             case VEC_FPOVER:
1085                 si_code = FPE_FLTOVF;
1086                 sig = SIGFPE;
1087                 break;
1088             case VEC_ZERODIV:
1089                 si_code = FPE_INTDIV;
1090                 sig = SIGFPE;
1091                 break;
1092             case VEC_CHK:
1093             case VEC_TRAP:
1094                 si_code = FPE_INTOVF;
1095                 sig = SIGFPE;
1096                 break;
1097             case VEC_TRACE:             /* ptrace single step */
1098                 si_code = TRAP_TRACE;
1099                 sig = SIGTRAP;
1100                 break;
1101             case VEC_TRAP15:            /* breakpoint */
1102                 si_code = TRAP_BRKPT;
1103                 sig = SIGTRAP;
1104                 break;
1105             default:
1106                 si_code = ILL_ILLOPC;
1107                 sig = SIGILL;
1108                 break;
1109         }
1110         switch (fp->ptregs.format) {
1111             default:
1112                 addr = (void __user *) fp->ptregs.pc;
1113                 break;
1114             case 2:
1115                 addr = (void __user *) fp->un.fmt2.iaddr;
1116                 break;
1117             case 7:
1118                 addr = (void __user *) fp->un.fmt7.effaddr;
1119                 break;
1120             case 9:
1121                 addr = (void __user *) fp->un.fmt9.iaddr;
1122                 break;
1123             case 10:
1124                 addr = (void __user *) fp->un.fmta.daddr;
1125                 break;
1126             case 11:
1127                 addr = (void __user*) fp->un.fmtb.daddr;
1128                 break;
1129         }
1130         force_sig_fault(sig, si_code, addr);
1131 }
1132 
1133 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1134 {
1135         if (!(fp->sr & PS_S))
1136                 return;
1137 
1138         console_verbose();
1139         pr_crit("%s: %08x\n", str, nr);
1140         show_registers(fp);
1141         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
1142         do_exit(SIGSEGV);
1143 }
1144 
1145 asmlinkage void set_esp0(unsigned long ssp)
1146 {
1147         current->thread.esp0 = ssp;
1148 }
1149 
1150 /*
1151  * This function is called if an error occur while accessing
1152  * user-space from the fpsp040 code.
1153  */
1154 asmlinkage void fpsp040_die(void)
1155 {
1156         do_exit(SIGSEGV);
1157 }
1158 
1159 #ifdef CONFIG_M68KFPU_EMU
1160 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1161 {
1162         force_sig_fault(signal, code, addr);
1163 }
1164 #endif
/* [<][>][^][v][top][bottom][index][help] */
root/arch/m68k/kernel/traps.c

DEFINITIONS
