Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
[~shefty/rdma-dev.git] / 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/system.h>
36 #include <asm/uaccess.h>
37 #include <asm/traps.h>
38 #include <asm/pgalloc.h>
39 #include <asm/machdep.h>
40 #include <asm/siginfo.h>
41
42
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 #ifdef DEBUG
138         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
139 #endif
140
141         if (fslw & MMU060_BPE) {
142                 /* branch prediction error -> clear branch cache */
143                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
144                                       "orl   #0x00400000,%/d0\n\t"
145                                       "movec %/d0,%/cacr"
146                                       : : : "d0" );
147                 /* return if there's no other error */
148                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
149                         return;
150         }
151
152         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
153                 unsigned long errorcode;
154                 unsigned long addr = fp->un.fmt4.effaddr;
155
156                 if (fslw & MMU060_MA)
157                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
158
159                 errorcode = 1;
160                 if (fslw & MMU060_DESC_ERR) {
161                         __flush_tlb040_one(addr);
162                         errorcode = 0;
163                 }
164                 if (fslw & MMU060_W)
165                         errorcode |= 2;
166 #ifdef DEBUG
167                 printk("errorcode = %d\n", errorcode );
168 #endif
169                 do_page_fault(&fp->ptregs, addr, errorcode);
170         } else if (fslw & (MMU060_SEE)){
171                 /* Software Emulation Error.
172                  * fault during mem_read/mem_write in ifpsp060/os.S
173                  */
174                 send_fault_sig(&fp->ptregs);
175         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
176                    send_fault_sig(&fp->ptregs) > 0) {
177                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
178                 printk( "68060 access error, fslw=%lx\n", fslw );
179                 trap_c( fp );
180         }
181 }
182 #endif /* CONFIG_M68060 */
183
184 #if defined (CONFIG_M68040)
185 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
186 {
187         unsigned long mmusr;
188         mm_segment_t old_fs = get_fs();
189
190         set_fs(MAKE_MM_SEG(wbs));
191
192         if (iswrite)
193                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
194         else
195                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
196
197         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
198
199         set_fs(old_fs);
200
201         return mmusr;
202 }
203
204 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
205                                    unsigned long wbd)
206 {
207         int res = 0;
208         mm_segment_t old_fs = get_fs();
209
210         /* set_fs can not be moved, otherwise put_user() may oops */
211         set_fs(MAKE_MM_SEG(wbs));
212
213         switch (wbs & WBSIZ_040) {
214         case BA_SIZE_BYTE:
215                 res = put_user(wbd & 0xff, (char __user *)wba);
216                 break;
217         case BA_SIZE_WORD:
218                 res = put_user(wbd & 0xffff, (short __user *)wba);
219                 break;
220         case BA_SIZE_LONG:
221                 res = put_user(wbd, (int __user *)wba);
222                 break;
223         }
224
225         /* set_fs can not be moved, otherwise put_user() may oops */
226         set_fs(old_fs);
227
228
229 #ifdef DEBUG
230         printk("do_040writeback1, res=%d\n",res);
231 #endif
232
233         return res;
234 }
235
236 /* after an exception in a writeback the stack frame corresponding
237  * to that exception is discarded, set a few bits in the old frame
238  * to simulate what it should look like
239  */
240 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
241 {
242         fp->un.fmt7.faddr = wba;
243         fp->un.fmt7.ssw = wbs & 0xff;
244         if (wba != current->thread.faddr)
245             fp->un.fmt7.ssw |= MA_040;
246 }
247
248 static inline void do_040writebacks(struct frame *fp)
249 {
250         int res = 0;
251 #if 0
252         if (fp->un.fmt7.wb1s & WBV_040)
253                 printk("access_error040: cannot handle 1st writeback. oops.\n");
254 #endif
255
256         if ((fp->un.fmt7.wb2s & WBV_040) &&
257             !(fp->un.fmt7.wb2s & WBTT_040)) {
258                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
259                                        fp->un.fmt7.wb2d);
260                 if (res)
261                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
262                 else
263                         fp->un.fmt7.wb2s = 0;
264         }
265
266         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
267         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
268                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
269                                        fp->un.fmt7.wb3d);
270                 if (res)
271                     {
272                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
273
274                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
275                         fp->un.fmt7.wb3s &= (~WBV_040);
276                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
277                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
278                     }
279                 else
280                         fp->un.fmt7.wb3s = 0;
281         }
282
283         if (res)
284                 send_fault_sig(&fp->ptregs);
285 }
286
287 /*
288  * called from sigreturn(), must ensure userspace code didn't
289  * manipulate exception frame to circumvent protection, then complete
290  * pending writebacks
291  * we just clear TM2 to turn it into a userspace access
292  */
293 asmlinkage void berr_040cleanup(struct frame *fp)
294 {
295         fp->un.fmt7.wb2s &= ~4;
296         fp->un.fmt7.wb3s &= ~4;
297
298         do_040writebacks(fp);
299 }
300
301 static inline void access_error040(struct frame *fp)
302 {
303         unsigned short ssw = fp->un.fmt7.ssw;
304         unsigned long mmusr;
305
306 #ifdef DEBUG
307         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
308         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
309                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
310         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
311                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
312                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
313 #endif
314
315         if (ssw & ATC_040) {
316                 unsigned long addr = fp->un.fmt7.faddr;
317                 unsigned long errorcode;
318
319                 /*
320                  * The MMU status has to be determined AFTER the address
321                  * has been corrected if there was a misaligned access (MA).
322                  */
323                 if (ssw & MA_040)
324                         addr = (addr + 7) & -8;
325
326                 /* MMU error, get the MMUSR info for this access */
327                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
328 #ifdef DEBUG
329                 printk("mmusr = %lx\n", mmusr);
330 #endif
331                 errorcode = 1;
332                 if (!(mmusr & MMU_R_040)) {
333                         /* clear the invalid atc entry */
334                         __flush_tlb040_one(addr);
335                         errorcode = 0;
336                 }
337
338                 /* despite what documentation seems to say, RMW
339                  * accesses have always both the LK and RW bits set */
340                 if (!(ssw & RW_040) || (ssw & LK_040))
341                         errorcode |= 2;
342
343                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
344 #ifdef DEBUG
345                         printk("do_page_fault() !=0\n");
346 #endif
347                         if (user_mode(&fp->ptregs)){
348                                 /* delay writebacks after signal delivery */
349 #ifdef DEBUG
350                                 printk(".. was usermode - return\n");
351 #endif
352                                 return;
353                         }
354                         /* disable writeback into user space from kernel
355                          * (if do_page_fault didn't fix the mapping,
356                          * the writeback won't do good)
357                          */
358 disable_wb:
359 #ifdef DEBUG
360                         printk(".. disabling wb2\n");
361 #endif
362                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
363                                 fp->un.fmt7.wb2s &= ~WBV_040;
364                         if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
365                                 fp->un.fmt7.wb3s &= ~WBV_040;
366                 }
367         } else {
368                 /* In case of a bus error we either kill the process or expect
369                  * the kernel to catch the fault, which then is also responsible
370                  * for cleaning up the mess.
371                  */
372                 current->thread.signo = SIGBUS;
373                 current->thread.faddr = fp->un.fmt7.faddr;
374                 if (send_fault_sig(&fp->ptregs) >= 0)
375                         printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
376                                fp->un.fmt7.faddr);
377                 goto disable_wb;
378         }
379
380         do_040writebacks(fp);
381 }
382 #endif /* CONFIG_M68040 */
383
384 #if defined(CONFIG_SUN3)
385 #include <asm/sun3mmu.h>
386
387 extern int mmu_emu_handle_fault (unsigned long, int, int);
388
389 /* sun3 version of bus_error030 */
390
391 static inline void bus_error030 (struct frame *fp)
392 {
393         unsigned char buserr_type = sun3_get_buserr ();
394         unsigned long addr, errorcode;
395         unsigned short ssw = fp->un.fmtb.ssw;
396         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
397
398 #ifdef DEBUG
399         if (ssw & (FC | FB))
400                 printk ("Instruction fault at %#010lx\n",
401                         ssw & FC ?
402                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
403                         :
404                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
405         if (ssw & DF)
406                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
407                         ssw & RW ? "read" : "write",
408                         fp->un.fmtb.daddr,
409                         space_names[ssw & DFC], fp->ptregs.pc);
410 #endif
411
412         /*
413          * Check if this page should be demand-mapped. This needs to go before
414          * the testing for a bad kernel-space access (demand-mapping applies
415          * to kernel accesses too).
416          */
417
418         if ((ssw & DF)
419             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
420                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
421                         return;
422         }
423
424         /* Check for kernel-space pagefault (BAD). */
425         if (fp->ptregs.sr & PS_S) {
426                 /* kernel fault must be a data fault to user space */
427                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
428                      // try checking the kernel mappings before surrender
429                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
430                           return;
431                         /* instruction fault or kernel data fault! */
432                         if (ssw & (FC | FB))
433                                 printk ("Instruction fault at %#010lx\n",
434                                         fp->ptregs.pc);
435                         if (ssw & DF) {
436                                 /* was this fault incurred testing bus mappings? */
437                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
438                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
439                                         send_fault_sig(&fp->ptregs);
440                                         return;
441                                 }
442
443                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
444                                         ssw & RW ? "read" : "write",
445                                         fp->un.fmtb.daddr,
446                                         space_names[ssw & DFC], fp->ptregs.pc);
447                         }
448                         printk ("BAD KERNEL BUSERR\n");
449
450                         die_if_kernel("Oops", &fp->ptregs,0);
451                         force_sig(SIGKILL, current);
452                         return;
453                 }
454         } else {
455                 /* user fault */
456                 if (!(ssw & (FC | FB)) && !(ssw & DF))
457                         /* not an instruction fault or data fault! BAD */
458                         panic ("USER BUSERR w/o instruction or data fault");
459         }
460
461
462         /* First handle the data fault, if any.  */
463         if (ssw & DF) {
464                 addr = fp->un.fmtb.daddr;
465
466 // errorcode bit 0:     0 -> no page            1 -> protection fault
467 // errorcode bit 1:     0 -> read fault         1 -> write fault
468
469 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
470 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
471
472                 if (buserr_type & SUN3_BUSERR_PROTERR)
473                         errorcode = 0x01;
474                 else if (buserr_type & SUN3_BUSERR_INVALID)
475                         errorcode = 0x00;
476                 else {
477 #ifdef DEBUG
478                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
479                         printk ("invalid %s access at %#lx from pc %#lx\n",
480                                 !(ssw & RW) ? "write" : "read", addr,
481                                 fp->ptregs.pc);
482 #endif
483                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
484                         force_sig (SIGBUS, current);
485                         return;
486                 }
487
488 //todo: wtf is RM bit? --m
489                 if (!(ssw & RW) || ssw & RM)
490                         errorcode |= 0x02;
491
492                 /* Handle page fault. */
493                 do_page_fault (&fp->ptregs, addr, errorcode);
494
495                 /* Retry the data fault now. */
496                 return;
497         }
498
499         /* Now handle the instruction fault. */
500
501         /* Get the fault address. */
502         if (fp->ptregs.format == 0xA)
503                 addr = fp->ptregs.pc + 4;
504         else
505                 addr = fp->un.fmtb.baddr;
506         if (ssw & FC)
507                 addr -= 2;
508
509         if (buserr_type & SUN3_BUSERR_INVALID) {
510                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
511                         do_page_fault (&fp->ptregs, addr, 0);
512        } else {
513 #ifdef DEBUG
514                 printk ("protection fault on insn access (segv).\n");
515 #endif
516                 force_sig (SIGSEGV, current);
517        }
518 }
519 #else
520 #if defined(CPU_M68020_OR_M68030)
521 static inline void bus_error030 (struct frame *fp)
522 {
523         volatile unsigned short temp;
524         unsigned short mmusr;
525         unsigned long addr, errorcode;
526         unsigned short ssw = fp->un.fmtb.ssw;
527 #ifdef DEBUG
528         unsigned long desc;
529
530         printk ("pid = %x  ", current->pid);
531         printk ("SSW=%#06x  ", ssw);
532
533         if (ssw & (FC | FB))
534                 printk ("Instruction fault at %#010lx\n",
535                         ssw & FC ?
536                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
537                         :
538                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
539         if (ssw & DF)
540                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
541                         ssw & RW ? "read" : "write",
542                         fp->un.fmtb.daddr,
543                         space_names[ssw & DFC], fp->ptregs.pc);
544 #endif
545
546         /* ++andreas: If a data fault and an instruction fault happen
547            at the same time map in both pages.  */
548
549         /* First handle the data fault, if any.  */
550         if (ssw & DF) {
551                 addr = fp->un.fmtb.daddr;
552
553 #ifdef DEBUG
554                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
555                               "pmove %%psr,%1"
556                               : "=a&" (desc), "=m" (temp)
557                               : "a" (addr), "d" (ssw));
558 #else
559                 asm volatile ("ptestr %2,%1@,#7\n\t"
560                               "pmove %%psr,%0"
561                               : "=m" (temp) : "a" (addr), "d" (ssw));
562 #endif
563                 mmusr = temp;
564
565 #ifdef DEBUG
566                 printk("mmusr is %#x for addr %#lx in task %p\n",
567                        mmusr, addr, current);
568                 printk("descriptor address is %#lx, contents %#lx\n",
569                        __va(desc), *(unsigned long *)__va(desc));
570 #endif
571
572                 errorcode = (mmusr & MMU_I) ? 0 : 1;
573                 if (!(ssw & RW) || (ssw & RM))
574                         errorcode |= 2;
575
576                 if (mmusr & (MMU_I | MMU_WP)) {
577                         if (ssw & 4) {
578                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
579                                        ssw & RW ? "read" : "write",
580                                        fp->un.fmtb.daddr,
581                                        space_names[ssw & DFC], fp->ptregs.pc);
582                                 goto buserr;
583                         }
584                         /* Don't try to do anything further if an exception was
585                            handled. */
586                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
587                                 return;
588                 } else if (!(mmusr & MMU_I)) {
589                         /* probably a 020 cas fault */
590                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
591                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
592                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
593                         printk("invalid %s access at %#lx from pc %#lx\n",
594                                !(ssw & RW) ? "write" : "read", addr,
595                                fp->ptregs.pc);
596                         die_if_kernel("Oops",&fp->ptregs,mmusr);
597                         force_sig(SIGSEGV, current);
598                         return;
599                 } else {
600 #if 0
601                         static volatile long tlong;
602 #endif
603
604                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
605                                !(ssw & RW) ? "write" : "read", addr,
606                                fp->ptregs.pc, ssw);
607                         asm volatile ("ptestr #1,%1@,#0\n\t"
608                                       "pmove %%psr,%0"
609                                       : "=m" (temp)
610                                       : "a" (addr));
611                         mmusr = temp;
612
613                         printk ("level 0 mmusr is %#x\n", mmusr);
614 #if 0
615                         asm volatile ("pmove %%tt0,%0"
616                                       : "=m" (tlong));
617                         printk("tt0 is %#lx, ", tlong);
618                         asm volatile ("pmove %%tt1,%0"
619                                       : "=m" (tlong));
620                         printk("tt1 is %#lx\n", tlong);
621 #endif
622 #ifdef DEBUG
623                         printk("Unknown SIGSEGV - 1\n");
624 #endif
625                         die_if_kernel("Oops",&fp->ptregs,mmusr);
626                         force_sig(SIGSEGV, current);
627                         return;
628                 }
629
630                 /* setup an ATC entry for the access about to be retried */
631                 if (!(ssw & RW) || (ssw & RM))
632                         asm volatile ("ploadw %1,%0@" : /* no outputs */
633                                       : "a" (addr), "d" (ssw));
634                 else
635                         asm volatile ("ploadr %1,%0@" : /* no outputs */
636                                       : "a" (addr), "d" (ssw));
637         }
638
639         /* Now handle the instruction fault. */
640
641         if (!(ssw & (FC|FB)))
642                 return;
643
644         if (fp->ptregs.sr & PS_S) {
645                 printk("Instruction fault at %#010lx\n",
646                         fp->ptregs.pc);
647         buserr:
648                 printk ("BAD KERNEL BUSERR\n");
649                 die_if_kernel("Oops",&fp->ptregs,0);
650                 force_sig(SIGKILL, current);
651                 return;
652         }
653
654         /* get the fault address */
655         if (fp->ptregs.format == 10)
656                 addr = fp->ptregs.pc + 4;
657         else
658                 addr = fp->un.fmtb.baddr;
659         if (ssw & FC)
660                 addr -= 2;
661
662         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
663                 /* Insn fault on same page as data fault.  But we
664                    should still create the ATC entry.  */
665                 goto create_atc_entry;
666
667 #ifdef DEBUG
668         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
669                       "pmove %%psr,%1"
670                       : "=a&" (desc), "=m" (temp)
671                       : "a" (addr));
672 #else
673         asm volatile ("ptestr #1,%1@,#7\n\t"
674                       "pmove %%psr,%0"
675                       : "=m" (temp) : "a" (addr));
676 #endif
677         mmusr = temp;
678
679 #ifdef DEBUG
680         printk ("mmusr is %#x for addr %#lx in task %p\n",
681                 mmusr, addr, current);
682         printk ("descriptor address is %#lx, contents %#lx\n",
683                 __va(desc), *(unsigned long *)__va(desc));
684 #endif
685
686         if (mmusr & MMU_I)
687                 do_page_fault (&fp->ptregs, addr, 0);
688         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
689                 printk ("invalid insn access at %#lx from pc %#lx\n",
690                         addr, fp->ptregs.pc);
691 #ifdef DEBUG
692                 printk("Unknown SIGSEGV - 2\n");
693 #endif
694                 die_if_kernel("Oops",&fp->ptregs,mmusr);
695                 force_sig(SIGSEGV, current);
696                 return;
697         }
698
699 create_atc_entry:
700         /* setup an ATC entry for the access about to be retried */
701         asm volatile ("ploadr #2,%0@" : /* no outputs */
702                       : "a" (addr));
703 }
704 #endif /* CPU_M68020_OR_M68030 */
705 #endif /* !CONFIG_SUN3 */
706
707 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
708 #include <asm/mcfmmu.h>
709
710 /*
711  *      The following table converts the FS encoding of a ColdFire
712  *      exception stack frame into the error_code value needed by
713  *      do_fault.
714 */
715 static const unsigned char fs_err_code[] = {
716         0,  /* 0000 */
717         0,  /* 0001 */
718         0,  /* 0010 */
719         0,  /* 0011 */
720         1,  /* 0100 */
721         0,  /* 0101 */
722         0,  /* 0110 */
723         0,  /* 0111 */
724         2,  /* 1000 */
725         3,  /* 1001 */
726         2,  /* 1010 */
727         0,  /* 1011 */
728         1,  /* 1100 */
729         1,  /* 1101 */
730         0,  /* 1110 */
731         0   /* 1111 */
732 };
733
734 static inline void access_errorcf(unsigned int fs, struct frame *fp)
735 {
736         unsigned long mmusr, addr;
737         unsigned int err_code;
738         int need_page_fault;
739
740         mmusr = mmu_read(MMUSR);
741         addr = mmu_read(MMUAR);
742
743         /*
744          * error_code:
745          *      bit 0 == 0 means no page found, 1 means protection fault
746          *      bit 1 == 0 means read, 1 means write
747          */
748         switch (fs) {
749         case  5:  /* 0101 TLB opword X miss */
750                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0);
751                 addr = fp->ptregs.pc;
752                 break;
753         case  6:  /* 0110 TLB extension word X miss */
754                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1);
755                 addr = fp->ptregs.pc + sizeof(long);
756                 break;
757         case 10:  /* 1010 TLB W miss */
758                 need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0);
759                 break;
760         case 14: /* 1110 TLB R miss */
761                 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0);
762                 break;
763         default:
764                 /* 0000 Normal  */
765                 /* 0001 Reserved */
766                 /* 0010 Interrupt during debug service routine */
767                 /* 0011 Reserved */
768                 /* 0100 X Protection */
769                 /* 0111 IFP in emulator mode */
770                 /* 1000 W Protection*/
771                 /* 1001 Write error*/
772                 /* 1011 Reserved*/
773                 /* 1100 R Protection*/
774                 /* 1101 R Protection*/
775                 /* 1111 OEP in emulator mode*/
776                 need_page_fault = 1;
777                 break;
778         }
779
780         if (need_page_fault) {
781                 err_code = fs_err_code[fs];
782                 if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */
783                         err_code |= 2; /* bit1 - write, bit0 - protection */
784                 do_page_fault(&fp->ptregs, addr, err_code);
785         }
786 }
787 #endif /* CONFIG_COLDFIRE CONFIG_MMU */
788
789 asmlinkage void buserr_c(struct frame *fp)
790 {
791         /* Only set esp0 if coming from user mode */
792         if (user_mode(&fp->ptregs))
793                 current->thread.esp0 = (unsigned long) fp;
794
795 #ifdef DEBUG
796         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
797 #endif
798
799 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
800         if (CPU_IS_COLDFIRE) {
801                 unsigned int fs;
802                 fs = (fp->ptregs.vector & 0x3) |
803                         ((fp->ptregs.vector & 0xc00) >> 8);
804                 switch (fs) {
805                 case 0x5:
806                 case 0x6:
807                 case 0x7:
808                 case 0x9:
809                 case 0xa:
810                 case 0xd:
811                 case 0xe:
812                 case 0xf:
813                         access_errorcf(fs, fp);
814                         return;
815                 default:
816                         break;
817                 }
818         }
819 #endif /* CONFIG_COLDFIRE && CONFIG_MMU */
820
821         switch (fp->ptregs.format) {
822 #if defined (CONFIG_M68060)
823         case 4:                         /* 68060 access error */
824           access_error060 (fp);
825           break;
826 #endif
827 #if defined (CONFIG_M68040)
828         case 0x7:                       /* 68040 access error */
829           access_error040 (fp);
830           break;
831 #endif
832 #if defined (CPU_M68020_OR_M68030)
833         case 0xa:
834         case 0xb:
835           bus_error030 (fp);
836           break;
837 #endif
838         default:
839           die_if_kernel("bad frame format",&fp->ptregs,0);
840 #ifdef DEBUG
841           printk("Unknown SIGSEGV - 4\n");
842 #endif
843           force_sig(SIGSEGV, current);
844         }
845 }
846
847
848 static int kstack_depth_to_print = 48;
849
850 void show_trace(unsigned long *stack)
851 {
852         unsigned long *endstack;
853         unsigned long addr;
854         int i;
855
856         printk("Call Trace:");
857         addr = (unsigned long)stack + THREAD_SIZE - 1;
858         endstack = (unsigned long *)(addr & -THREAD_SIZE);
859         i = 0;
860         while (stack + 1 <= endstack) {
861                 addr = *stack++;
862                 /*
863                  * If the address is either in the text segment of the
864                  * kernel, or in the region which contains vmalloc'ed
865                  * memory, it *may* be the address of a calling
866                  * routine; if so, print it so that someone tracing
867                  * down the cause of the crash will be able to figure
868                  * out the call path that was taken.
869                  */
870                 if (__kernel_text_address(addr)) {
871 #ifndef CONFIG_KALLSYMS
872                         if (i % 5 == 0)
873                                 printk("\n       ");
874 #endif
875                         printk(" [<%08lx>] %pS\n", addr, (void *)addr);
876                         i++;
877                 }
878         }
879         printk("\n");
880 }
881
882 void show_registers(struct pt_regs *regs)
883 {
884         struct frame *fp = (struct frame *)regs;
885         mm_segment_t old_fs = get_fs();
886         u16 c, *cp;
887         unsigned long addr;
888         int i;
889
890         print_modules();
891         printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
892         printk("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
893         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
894                regs->d0, regs->d1, regs->d2, regs->d3);
895         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
896                regs->d4, regs->d5, regs->a0, regs->a1);
897
898         printk("Process %s (pid: %d, task=%p)\n",
899                 current->comm, task_pid_nr(current), current);
900         addr = (unsigned long)&fp->un;
901         printk("Frame format=%X ", regs->format);
902         switch (regs->format) {
903         case 0x2:
904                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
905                 addr += sizeof(fp->un.fmt2);
906                 break;
907         case 0x3:
908                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
909                 addr += sizeof(fp->un.fmt3);
910                 break;
911         case 0x4:
912                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
913                         : "eff addr=%08lx pc=%08lx\n"),
914                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
915                 addr += sizeof(fp->un.fmt4);
916                 break;
917         case 0x7:
918                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
919                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
920                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
921                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
922                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
923                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
924                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
925                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
926                 printk("push data: %08lx %08lx %08lx %08lx\n",
927                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
928                         fp->un.fmt7.pd3);
929                 addr += sizeof(fp->un.fmt7);
930                 break;
931         case 0x9:
932                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
933                 addr += sizeof(fp->un.fmt9);
934                 break;
935         case 0xa:
936                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
937                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
938                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
939                 addr += sizeof(fp->un.fmta);
940                 break;
941         case 0xb:
942                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
943                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
944                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
945                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
946                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
947                 addr += sizeof(fp->un.fmtb);
948                 break;
949         default:
950                 printk("\n");
951         }
952         show_stack(NULL, (unsigned long *)addr);
953
954         printk("Code:");
955         set_fs(KERNEL_DS);
956         cp = (u16 *)regs->pc;
957         for (i = -8; i < 16; i++) {
958                 if (get_user(c, cp + i) && i >= 0) {
959                         printk(" Bad PC value.");
960                         break;
961                 }
962                 printk(i ? " %04x" : " <%04x>", c);
963         }
964         set_fs(old_fs);
965         printk ("\n");
966 }
967
968 void show_stack(struct task_struct *task, unsigned long *stack)
969 {
970         unsigned long *p;
971         unsigned long *endstack;
972         int i;
973
974         if (!stack) {
975                 if (task)
976                         stack = (unsigned long *)task->thread.esp0;
977                 else
978                         stack = (unsigned long *)&stack;
979         }
980         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
981
982         printk("Stack from %08lx:", (unsigned long)stack);
983         p = stack;
984         for (i = 0; i < kstack_depth_to_print; i++) {
985                 if (p + 1 > endstack)
986                         break;
987                 if (i % 8 == 0)
988                         printk("\n       ");
989                 printk(" %08lx", *p++);
990         }
991         printk("\n");
992         show_trace(stack);
993 }
994
995 /*
996  * The architecture-independent backtrace generator
997  */
998 void dump_stack(void)
999 {
1000         unsigned long stack;
1001
1002         show_trace(&stack);
1003 }
1004
1005 EXPORT_SYMBOL(dump_stack);
1006
1007 /*
1008  * The vector number returned in the frame pointer may also contain
1009  * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
1010  * 2 bits, and upper 2 bits. So we need to mask out the real vector
1011  * number before using it in comparisons. You don't need to do this on
1012  * real 68k parts, but it won't hurt either.
1013  */
1014
1015 void bad_super_trap (struct frame *fp)
1016 {
1017         int vector = (fp->ptregs.vector >> 2) & 0xff;
1018
1019         console_verbose();
1020         if (vector < ARRAY_SIZE(vec_names))
1021                 printk ("*** %s ***   FORMAT=%X\n",
1022                         vec_names[vector],
1023                         fp->ptregs.format);
1024         else
1025                 printk ("*** Exception %d ***   FORMAT=%X\n",
1026                         vector, fp->ptregs.format);
1027         if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
1028                 unsigned short ssw = fp->un.fmtb.ssw;
1029
1030                 printk ("SSW=%#06x  ", ssw);
1031
1032                 if (ssw & RC)
1033                         printk ("Pipe stage C instruction fault at %#010lx\n",
1034                                 (fp->ptregs.format) == 0xA ?
1035                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1036                 if (ssw & RB)
1037                         printk ("Pipe stage B instruction fault at %#010lx\n",
1038                                 (fp->ptregs.format) == 0xA ?
1039                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1040                 if (ssw & DF)
1041                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1042                                 ssw & RW ? "read" : "write",
1043                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1044                                 fp->ptregs.pc);
1045         }
1046         printk ("Current process id is %d\n", task_pid_nr(current));
1047         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1048 }
1049
1050 asmlinkage void trap_c(struct frame *fp)
1051 {
1052         int sig;
1053         int vector = (fp->ptregs.vector >> 2) & 0xff;
1054         siginfo_t info;
1055
1056         if (fp->ptregs.sr & PS_S) {
1057                 if (vector == VEC_TRACE) {
1058                         /* traced a trapping instruction on a 68020/30,
1059                          * real exception will be executed afterwards.
1060                          */
1061                 } else if (!handle_kernel_fault(&fp->ptregs))
1062                         bad_super_trap(fp);
1063                 return;
1064         }
1065
1066         /* send the appropriate signal to the user program */
1067         switch (vector) {
1068             case VEC_ADDRERR:
1069                 info.si_code = BUS_ADRALN;
1070                 sig = SIGBUS;
1071                 break;
1072             case VEC_ILLEGAL:
1073             case VEC_LINE10:
1074             case VEC_LINE11:
1075                 info.si_code = ILL_ILLOPC;
1076                 sig = SIGILL;
1077                 break;
1078             case VEC_PRIV:
1079                 info.si_code = ILL_PRVOPC;
1080                 sig = SIGILL;
1081                 break;
1082             case VEC_COPROC:
1083                 info.si_code = ILL_COPROC;
1084                 sig = SIGILL;
1085                 break;
1086             case VEC_TRAP1:
1087             case VEC_TRAP2:
1088             case VEC_TRAP3:
1089             case VEC_TRAP4:
1090             case VEC_TRAP5:
1091             case VEC_TRAP6:
1092             case VEC_TRAP7:
1093             case VEC_TRAP8:
1094             case VEC_TRAP9:
1095             case VEC_TRAP10:
1096             case VEC_TRAP11:
1097             case VEC_TRAP12:
1098             case VEC_TRAP13:
1099             case VEC_TRAP14:
1100                 info.si_code = ILL_ILLTRP;
1101                 sig = SIGILL;
1102                 break;
1103             case VEC_FPBRUC:
1104             case VEC_FPOE:
1105             case VEC_FPNAN:
1106                 info.si_code = FPE_FLTINV;
1107                 sig = SIGFPE;
1108                 break;
1109             case VEC_FPIR:
1110                 info.si_code = FPE_FLTRES;
1111                 sig = SIGFPE;
1112                 break;
1113             case VEC_FPDIVZ:
1114                 info.si_code = FPE_FLTDIV;
1115                 sig = SIGFPE;
1116                 break;
1117             case VEC_FPUNDER:
1118                 info.si_code = FPE_FLTUND;
1119                 sig = SIGFPE;
1120                 break;
1121             case VEC_FPOVER:
1122                 info.si_code = FPE_FLTOVF;
1123                 sig = SIGFPE;
1124                 break;
1125             case VEC_ZERODIV:
1126                 info.si_code = FPE_INTDIV;
1127                 sig = SIGFPE;
1128                 break;
1129             case VEC_CHK:
1130             case VEC_TRAP:
1131                 info.si_code = FPE_INTOVF;
1132                 sig = SIGFPE;
1133                 break;
1134             case VEC_TRACE:             /* ptrace single step */
1135                 info.si_code = TRAP_TRACE;
1136                 sig = SIGTRAP;
1137                 break;
1138             case VEC_TRAP15:            /* breakpoint */
1139                 info.si_code = TRAP_BRKPT;
1140                 sig = SIGTRAP;
1141                 break;
1142             default:
1143                 info.si_code = ILL_ILLOPC;
1144                 sig = SIGILL;
1145                 break;
1146         }
1147         info.si_signo = sig;
1148         info.si_errno = 0;
1149         switch (fp->ptregs.format) {
1150             default:
1151                 info.si_addr = (void *) fp->ptregs.pc;
1152                 break;
1153             case 2:
1154                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1155                 break;
1156             case 7:
1157                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1158                 break;
1159             case 9:
1160                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1161                 break;
1162             case 10:
1163                 info.si_addr = (void *) fp->un.fmta.daddr;
1164                 break;
1165             case 11:
1166                 info.si_addr = (void *) fp->un.fmtb.daddr;
1167                 break;
1168         }
1169         force_sig_info (sig, &info, current);
1170 }
1171
1172 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1173 {
1174         if (!(fp->sr & PS_S))
1175                 return;
1176
1177         console_verbose();
1178         printk("%s: %08x\n",str,nr);
1179         show_registers(fp);
1180         add_taint(TAINT_DIE);
1181         do_exit(SIGSEGV);
1182 }
1183
1184 asmlinkage void set_esp0(unsigned long ssp)
1185 {
1186         current->thread.esp0 = ssp;
1187 }
1188
1189 /*
1190  * This function is called if an error occur while accessing
1191  * user-space from the fpsp040 code.
1192  */
1193 asmlinkage void fpsp040_die(void)
1194 {
1195         do_exit(SIGSEGV);
1196 }
1197
1198 #ifdef CONFIG_M68KFPU_EMU
1199 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1200 {
1201         siginfo_t info;
1202
1203         info.si_signo = signal;
1204         info.si_errno = 0;
1205         info.si_code = code;
1206         info.si_addr = addr;
1207         force_sig_info(signal, &info, current);
1208 }
1209 #endif