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NFSv4.1/flexfiles: Fix a protocol error in layoutreturn
[linux/fpc-iii.git] / arch / m68k / kernel / traps.c
blob6c9ca24830e9829d7be7761bdd528a765e8b7d2f
1 /*
2 * linux/arch/m68k/kernel/traps.c
3 *
4 * Copyright (C) 1993, 1994 by Hamish Macdonald
5 *
6 * 68040 fixes by Michael Rausch
7 * 68040 fixes by Martin Apel
8 * 68040 fixes and writeback by Richard Zidlicky
9 * 68060 fixes by Roman Hodek
10 * 68060 fixes by Jesper Skov
11 *
12 * This file is subject to the terms and conditions of the GNU General Public
13 * License. See the file COPYING in the main directory of this archive
14 * for more details.
15 */
16
17 /*
18 * Sets up all exception vectors
19 */
20
21 #include <linux/sched.h>
22 #include <linux/signal.h>
23 #include <linux/kernel.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/user.h>
27 #include <linux/string.h>
28 #include <linux/linkage.h>
29 #include <linux/init.h>
30 #include <linux/ptrace.h>
31 #include <linux/kallsyms.h>
32
33 #include <asm/setup.h>
34 #include <asm/fpu.h>
35 #include <asm/uaccess.h>
36 #include <asm/traps.h>
37 #include <asm/pgalloc.h>
38 #include <asm/machdep.h>
39 #include <asm/siginfo.h>
40
41
42 static const char *vec_names[] = {
43 [VEC_RESETSP] = "RESET SP",
44 [VEC_RESETPC] = "RESET PC",
45 [VEC_BUSERR] = "BUS ERROR",
46 [VEC_ADDRERR] = "ADDRESS ERROR",
47 [VEC_ILLEGAL] = "ILLEGAL INSTRUCTION",
48 [VEC_ZERODIV] = "ZERO DIVIDE",
49 [VEC_CHK] = "CHK",
50 [VEC_TRAP] = "TRAPcc",
51 [VEC_PRIV] = "PRIVILEGE VIOLATION",
52 [VEC_TRACE] = "TRACE",
53 [VEC_LINE10] = "LINE 1010",
54 [VEC_LINE11] = "LINE 1111",
55 [VEC_RESV12] = "UNASSIGNED RESERVED 12",
56 [VEC_COPROC] = "COPROCESSOR PROTOCOL VIOLATION",
57 [VEC_FORMAT] = "FORMAT ERROR",
58 [VEC_UNINT] = "UNINITIALIZED INTERRUPT",
59 [VEC_RESV16] = "UNASSIGNED RESERVED 16",
60 [VEC_RESV17] = "UNASSIGNED RESERVED 17",
61 [VEC_RESV18] = "UNASSIGNED RESERVED 18",
62 [VEC_RESV19] = "UNASSIGNED RESERVED 19",
63 [VEC_RESV20] = "UNASSIGNED RESERVED 20",
64 [VEC_RESV21] = "UNASSIGNED RESERVED 21",
65 [VEC_RESV22] = "UNASSIGNED RESERVED 22",
66 [VEC_RESV23] = "UNASSIGNED RESERVED 23",
67 [VEC_SPUR] = "SPURIOUS INTERRUPT",
68 [VEC_INT1] = "LEVEL 1 INT",
69 [VEC_INT2] = "LEVEL 2 INT",
70 [VEC_INT3] = "LEVEL 3 INT",
71 [VEC_INT4] = "LEVEL 4 INT",
72 [VEC_INT5] = "LEVEL 5 INT",
73 [VEC_INT6] = "LEVEL 6 INT",
74 [VEC_INT7] = "LEVEL 7 INT",
75 [VEC_SYS] = "SYSCALL",
76 [VEC_TRAP1] = "TRAP #1",
77 [VEC_TRAP2] = "TRAP #2",
78 [VEC_TRAP3] = "TRAP #3",
79 [VEC_TRAP4] = "TRAP #4",
80 [VEC_TRAP5] = "TRAP #5",
81 [VEC_TRAP6] = "TRAP #6",
82 [VEC_TRAP7] = "TRAP #7",
83 [VEC_TRAP8] = "TRAP #8",
84 [VEC_TRAP9] = "TRAP #9",
85 [VEC_TRAP10] = "TRAP #10",
86 [VEC_TRAP11] = "TRAP #11",
87 [VEC_TRAP12] = "TRAP #12",
88 [VEC_TRAP13] = "TRAP #13",
89 [VEC_TRAP14] = "TRAP #14",
90 [VEC_TRAP15] = "TRAP #15",
91 [VEC_FPBRUC] = "FPCP BSUN",
92 [VEC_FPIR] = "FPCP INEXACT",
93 [VEC_FPDIVZ] = "FPCP DIV BY 0",
94 [VEC_FPUNDER] = "FPCP UNDERFLOW",
95 [VEC_FPOE] = "FPCP OPERAND ERROR",
96 [VEC_FPOVER] = "FPCP OVERFLOW",
97 [VEC_FPNAN] = "FPCP SNAN",
98 [VEC_FPUNSUP] = "FPCP UNSUPPORTED OPERATION",
99 [VEC_MMUCFG] = "MMU CONFIGURATION ERROR",
100 [VEC_MMUILL] = "MMU ILLEGAL OPERATION ERROR",
101 [VEC_MMUACC] = "MMU ACCESS LEVEL VIOLATION ERROR",
102 [VEC_RESV59] = "UNASSIGNED RESERVED 59",
103 [VEC_UNIMPEA] = "UNASSIGNED RESERVED 60",
104 [VEC_UNIMPII] = "UNASSIGNED RESERVED 61",
105 [VEC_RESV62] = "UNASSIGNED RESERVED 62",
106 [VEC_RESV63] = "UNASSIGNED RESERVED 63",
107 };
108
109 static const char *space_names[] = {
110 [0] = "Space 0",
111 [USER_DATA] = "User Data",
112 [USER_PROGRAM] = "User Program",
113 #ifndef CONFIG_SUN3
114 [3] = "Space 3",
115 #else
116 [FC_CONTROL] = "Control",
117 #endif
118 [4] = "Space 4",
119 [SUPER_DATA] = "Super Data",
120 [SUPER_PROGRAM] = "Super Program",
121 [CPU_SPACE] = "CPU"
122 };
123
124 void die_if_kernel(char *,struct pt_regs *,int);
125 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
126 unsigned long error_code);
127 int send_fault_sig(struct pt_regs *regs);
128
129 asmlinkage void trap_c(struct frame *fp);
130
131 #if defined (CONFIG_M68060)
132 static inline void access_error060 (struct frame *fp)
133 {
134 unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
135
136 pr_debug("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
137
138 if (fslw & MMU060_BPE) {
139 /* branch prediction error -> clear branch cache */
140 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
141 "orl #0x00400000,%/d0\n\t"
142 "movec %/d0,%/cacr"
143 : : : "d0" );
144 /* return if there's no other error */
145 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
146 return;
147 }
148
149 if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
150 unsigned long errorcode;
151 unsigned long addr = fp->un.fmt4.effaddr;
152
153 if (fslw & MMU060_MA)
154 addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
155
156 errorcode = 1;
157 if (fslw & MMU060_DESC_ERR) {
158 __flush_tlb040_one(addr);
159 errorcode = 0;
160 }
161 if (fslw & MMU060_W)
162 errorcode |= 2;
163 pr_debug("errorcode = %ld\n", errorcode);
164 do_page_fault(&fp->ptregs, addr, errorcode);
165 } else if (fslw & (MMU060_SEE)){
166 /* Software Emulation Error.
167 * fault during mem_read/mem_write in ifpsp060/os.S
168 */
169 send_fault_sig(&fp->ptregs);
170 } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
171 send_fault_sig(&fp->ptregs) > 0) {
172 pr_err("pc=%#lx, fa=%#lx\n", fp->ptregs.pc,
173 fp->un.fmt4.effaddr);
174 pr_err("68060 access error, fslw=%lx\n", fslw);
175 trap_c( fp );
176 }
177 }
178 #endif /* CONFIG_M68060 */
179
180 #if defined (CONFIG_M68040)
181 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
182 {
183 unsigned long mmusr;
184 mm_segment_t old_fs = get_fs();
185
186 set_fs(MAKE_MM_SEG(wbs));
187
188 if (iswrite)
189 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
190 else
191 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
192
193 asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
194
195 set_fs(old_fs);
196
197 return mmusr;
198 }
199
200 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
201 unsigned long wbd)
202 {
203 int res = 0;
204 mm_segment_t old_fs = get_fs();
205
206 /* set_fs can not be moved, otherwise put_user() may oops */
207 set_fs(MAKE_MM_SEG(wbs));
208
209 switch (wbs & WBSIZ_040) {
210 case BA_SIZE_BYTE:
211 res = put_user(wbd & 0xff, (char __user *)wba);
212 break;
213 case BA_SIZE_WORD:
214 res = put_user(wbd & 0xffff, (short __user *)wba);
215 break;
216 case BA_SIZE_LONG:
217 res = put_user(wbd, (int __user *)wba);
218 break;
219 }
220
221 /* set_fs can not be moved, otherwise put_user() may oops */
222 set_fs(old_fs);
223
224
225 pr_debug("do_040writeback1, res=%d\n", res);
226
227 return res;
228 }
229
230 /* after an exception in a writeback the stack frame corresponding
231 * to that exception is discarded, set a few bits in the old frame
232 * to simulate what it should look like
233 */
234 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
235 {
236 fp->un.fmt7.faddr = wba;
237 fp->un.fmt7.ssw = wbs & 0xff;
238 if (wba != current->thread.faddr)
239 fp->un.fmt7.ssw |= MA_040;
240 }
241
242 static inline void do_040writebacks(struct frame *fp)
243 {
244 int res = 0;
245 #if 0
246 if (fp->un.fmt7.wb1s & WBV_040)
247 pr_err("access_error040: cannot handle 1st writeback. oops.\n");
248 #endif
249
250 if ((fp->un.fmt7.wb2s & WBV_040) &&
251 !(fp->un.fmt7.wb2s & WBTT_040)) {
252 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
253 fp->un.fmt7.wb2d);
254 if (res)
255 fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
256 else
257 fp->un.fmt7.wb2s = 0;
258 }
259
260 /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
261 if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
262 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
263 fp->un.fmt7.wb3d);
264 if (res)
265 {
266 fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
267
268 fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
269 fp->un.fmt7.wb3s &= (~WBV_040);
270 fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
271 fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
272 }
273 else
274 fp->un.fmt7.wb3s = 0;
275 }
276
277 if (res)
278 send_fault_sig(&fp->ptregs);
279 }
280
281 /*
282 * called from sigreturn(), must ensure userspace code didn't
283 * manipulate exception frame to circumvent protection, then complete
284 * pending writebacks
285 * we just clear TM2 to turn it into a userspace access
286 */
287 asmlinkage void berr_040cleanup(struct frame *fp)
288 {
289 fp->un.fmt7.wb2s &= ~4;
290 fp->un.fmt7.wb3s &= ~4;
291
292 do_040writebacks(fp);
293 }
294
295 static inline void access_error040(struct frame *fp)
296 {
297 unsigned short ssw = fp->un.fmt7.ssw;
298 unsigned long mmusr;
299
300 pr_debug("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
301 pr_debug("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
302 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
303 pr_debug("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
304 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
305 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
306
307 if (ssw & ATC_040) {
308 unsigned long addr = fp->un.fmt7.faddr;
309 unsigned long errorcode;
310
311 /*
312 * The MMU status has to be determined AFTER the address
313 * has been corrected if there was a misaligned access (MA).
314 */
315 if (ssw & MA_040)
316 addr = (addr + 7) & -8;
317
318 /* MMU error, get the MMUSR info for this access */
319 mmusr = probe040(!(ssw & RW_040), addr, ssw);
320 pr_debug("mmusr = %lx\n", mmusr);
321 errorcode = 1;
322 if (!(mmusr & MMU_R_040)) {
323 /* clear the invalid atc entry */
324 __flush_tlb040_one(addr);
325 errorcode = 0;
326 }
327
328 /* despite what documentation seems to say, RMW
329 * accesses have always both the LK and RW bits set */
330 if (!(ssw & RW_040) || (ssw & LK_040))
331 errorcode |= 2;
332
333 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
334 pr_debug("do_page_fault() !=0\n");
335 if (user_mode(&fp->ptregs)){
336 /* delay writebacks after signal delivery */
337 pr_debug(".. was usermode - return\n");
338 return;
339 }
340 /* disable writeback into user space from kernel
341 * (if do_page_fault didn't fix the mapping,
342 * the writeback won't do good)
343 */
344 disable_wb:
345 pr_debug(".. disabling wb2\n");
346 if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
347 fp->un.fmt7.wb2s &= ~WBV_040;
348 if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
349 fp->un.fmt7.wb3s &= ~WBV_040;
350 }
351 } else {
352 /* In case of a bus error we either kill the process or expect
353 * the kernel to catch the fault, which then is also responsible
354 * for cleaning up the mess.
355 */
356 current->thread.signo = SIGBUS;
357 current->thread.faddr = fp->un.fmt7.faddr;
358 if (send_fault_sig(&fp->ptregs) >= 0)
359 pr_err("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
360 fp->un.fmt7.faddr);
361 goto disable_wb;
362 }
363
364 do_040writebacks(fp);
365 }
366 #endif /* CONFIG_M68040 */
367
368 #if defined(CONFIG_SUN3)
369 #include <asm/sun3mmu.h>
370
371 extern int mmu_emu_handle_fault (unsigned long, int, int);
372
373 /* sun3 version of bus_error030 */
374
375 static inline void bus_error030 (struct frame *fp)
376 {
377 unsigned char buserr_type = sun3_get_buserr ();
378 unsigned long addr, errorcode;
379 unsigned short ssw = fp->un.fmtb.ssw;
380 extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
381
382 if (ssw & (FC | FB))
383 pr_debug("Instruction fault at %#010lx\n",
384 ssw & FC ?
385 fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
386 :
387 fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
388 if (ssw & DF)
389 pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
390 ssw & RW ? "read" : "write",
391 fp->un.fmtb.daddr,
392 space_names[ssw & DFC], fp->ptregs.pc);
393
394 /*
395 * Check if this page should be demand-mapped. This needs to go before
396 * the testing for a bad kernel-space access (demand-mapping applies
397 * to kernel accesses too).
398 */
399
400 if ((ssw & DF)
401 && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
402 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
403 return;
404 }
405
406 /* Check for kernel-space pagefault (BAD). */
407 if (fp->ptregs.sr & PS_S) {
408 /* kernel fault must be a data fault to user space */
409 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
410 // try checking the kernel mappings before surrender
411 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
412 return;
413 /* instruction fault or kernel data fault! */
414 if (ssw & (FC | FB))
415 pr_err("Instruction fault at %#010lx\n",
416 fp->ptregs.pc);
417 if (ssw & DF) {
418 /* was this fault incurred testing bus mappings? */
419 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
420 (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
421 send_fault_sig(&fp->ptregs);
422 return;
423 }
424
425 pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
426 ssw & RW ? "read" : "write",
427 fp->un.fmtb.daddr,
428 space_names[ssw & DFC], fp->ptregs.pc);
429 }
430 pr_err("BAD KERNEL BUSERR\n");
431
432 die_if_kernel("Oops", &fp->ptregs,0);
433 force_sig(SIGKILL, current);
434 return;
435 }
436 } else {
437 /* user fault */
438 if (!(ssw & (FC | FB)) && !(ssw & DF))
439 /* not an instruction fault or data fault! BAD */
440 panic ("USER BUSERR w/o instruction or data fault");
441 }
442
443
444 /* First handle the data fault, if any. */
445 if (ssw & DF) {
446 addr = fp->un.fmtb.daddr;
447
448 // errorcode bit 0: 0 -> no page 1 -> protection fault
449 // errorcode bit 1: 0 -> read fault 1 -> write fault
450
451 // (buserr_type & SUN3_BUSERR_PROTERR) -> protection fault
452 // (buserr_type & SUN3_BUSERR_INVALID) -> invalid page fault
453
454 if (buserr_type & SUN3_BUSERR_PROTERR)
455 errorcode = 0x01;
456 else if (buserr_type & SUN3_BUSERR_INVALID)
457 errorcode = 0x00;
458 else {
459 pr_debug("*** unexpected busfault type=%#04x\n",
460 buserr_type);
461 pr_debug("invalid %s access at %#lx from pc %#lx\n",
462 !(ssw & RW) ? "write" : "read", addr,
463 fp->ptregs.pc);
464 die_if_kernel ("Oops", &fp->ptregs, buserr_type);
465 force_sig (SIGBUS, current);
466 return;
467 }
468
469 //todo: wtf is RM bit? --m
470 if (!(ssw & RW) || ssw & RM)
471 errorcode |= 0x02;
472
473 /* Handle page fault. */
474 do_page_fault (&fp->ptregs, addr, errorcode);
475
476 /* Retry the data fault now. */
477 return;
478 }
479
480 /* Now handle the instruction fault. */
481
482 /* Get the fault address. */
483 if (fp->ptregs.format == 0xA)
484 addr = fp->ptregs.pc + 4;
485 else
486 addr = fp->un.fmtb.baddr;
487 if (ssw & FC)
488 addr -= 2;
489
490 if (buserr_type & SUN3_BUSERR_INVALID) {
491 if (!mmu_emu_handle_fault(addr, 1, 0))
492 do_page_fault (&fp->ptregs, addr, 0);
493 } else {
494 pr_debug("protection fault on insn access (segv).\n");
495 force_sig (SIGSEGV, current);
496 }
497 }
498 #else
499 #if defined(CPU_M68020_OR_M68030)
500 static inline void bus_error030 (struct frame *fp)
501 {
502 volatile unsigned short temp;
503 unsigned short mmusr;
504 unsigned long addr, errorcode;
505 unsigned short ssw = fp->un.fmtb.ssw;
506 #ifdef DEBUG
507 unsigned long desc;
508 #endif
509
510 pr_debug("pid = %x ", current->pid);
511 pr_debug("SSW=%#06x ", ssw);
512
513 if (ssw & (FC | FB))
514 pr_debug("Instruction fault at %#010lx\n",
515 ssw & FC ?
516 fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
517 :
518 fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
519 if (ssw & DF)
520 pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
521 ssw & RW ? "read" : "write",
522 fp->un.fmtb.daddr,
523 space_names[ssw & DFC], fp->ptregs.pc);
524
525 /* ++andreas: If a data fault and an instruction fault happen
526 at the same time map in both pages. */
527
528 /* First handle the data fault, if any. */
529 if (ssw & DF) {
530 addr = fp->un.fmtb.daddr;
531
532 #ifdef DEBUG
533 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
534 "pmove %%psr,%1"
535 : "=a&" (desc), "=m" (temp)
536 : "a" (addr), "d" (ssw));
537 pr_debug("mmusr is %#x for addr %#lx in task %p\n",
538 temp, addr, current);
539 pr_debug("descriptor address is 0x%p, contents %#lx\n",
540 __va(desc), *(unsigned long *)__va(desc));
541 #else
542 asm volatile ("ptestr %2,%1@,#7\n\t"
543 "pmove %%psr,%0"
544 : "=m" (temp) : "a" (addr), "d" (ssw));
545 #endif
546 mmusr = temp;
547 errorcode = (mmusr & MMU_I) ? 0 : 1;
548 if (!(ssw & RW) || (ssw & RM))
549 errorcode |= 2;
550
551 if (mmusr & (MMU_I | MMU_WP)) {
552 if (ssw & 4) {
553 pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
554 ssw & RW ? "read" : "write",
555 fp->un.fmtb.daddr,
556 space_names[ssw & DFC], fp->ptregs.pc);
557 goto buserr;
558 }
559 /* Don't try to do anything further if an exception was
560 handled. */
561 if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
562 return;
563 } else if (!(mmusr & MMU_I)) {
564 /* probably a 020 cas fault */
565 if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
566 pr_err("unexpected bus error (%#x,%#x)\n", ssw,
567 mmusr);
568 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
569 pr_err("invalid %s access at %#lx from pc %#lx\n",
570 !(ssw & RW) ? "write" : "read", addr,
571 fp->ptregs.pc);
572 die_if_kernel("Oops",&fp->ptregs,mmusr);
573 force_sig(SIGSEGV, current);
574 return;
575 } else {
576 #if 0
577 static volatile long tlong;
578 #endif
579
580 pr_err("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
581 !(ssw & RW) ? "write" : "read", addr,
582 fp->ptregs.pc, ssw);
583 asm volatile ("ptestr #1,%1@,#0\n\t"
584 "pmove %%psr,%0"
585 : "=m" (temp)
586 : "a" (addr));
587 mmusr = temp;
588
589 pr_err("level 0 mmusr is %#x\n", mmusr);
590 #if 0
591 asm volatile ("pmove %%tt0,%0"
592 : "=m" (tlong));
593 pr_debug("tt0 is %#lx, ", tlong);
594 asm volatile ("pmove %%tt1,%0"
595 : "=m" (tlong));
596 pr_debug("tt1 is %#lx\n", tlong);
597 #endif
598 pr_debug("Unknown SIGSEGV - 1\n");
599 die_if_kernel("Oops",&fp->ptregs,mmusr);
600 force_sig(SIGSEGV, current);
601 return;
602 }
603
604 /* setup an ATC entry for the access about to be retried */
605 if (!(ssw & RW) || (ssw & RM))
606 asm volatile ("ploadw %1,%0@" : /* no outputs */
607 : "a" (addr), "d" (ssw));
608 else
609 asm volatile ("ploadr %1,%0@" : /* no outputs */
610 : "a" (addr), "d" (ssw));
611 }
612
613 /* Now handle the instruction fault. */
614
615 if (!(ssw & (FC|FB)))
616 return;
617
618 if (fp->ptregs.sr & PS_S) {
619 pr_err("Instruction fault at %#010lx\n", fp->ptregs.pc);
620 buserr:
621 pr_err("BAD KERNEL BUSERR\n");
622 die_if_kernel("Oops",&fp->ptregs,0);
623 force_sig(SIGKILL, current);
624 return;
625 }
626
627 /* get the fault address */
628 if (fp->ptregs.format == 10)
629 addr = fp->ptregs.pc + 4;
630 else
631 addr = fp->un.fmtb.baddr;
632 if (ssw & FC)
633 addr -= 2;
634
635 if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
636 /* Insn fault on same page as data fault. But we
637 should still create the ATC entry. */
638 goto create_atc_entry;
639
640 #ifdef DEBUG
641 asm volatile ("ptestr #1,%2@,#7,%0\n\t"
642 "pmove %%psr,%1"
643 : "=a&" (desc), "=m" (temp)
644 : "a" (addr));
645 pr_debug("mmusr is %#x for addr %#lx in task %p\n",
646 temp, addr, current);
647 pr_debug("descriptor address is 0x%p, contents %#lx\n",
648 __va(desc), *(unsigned long *)__va(desc));
649 #else
650 asm volatile ("ptestr #1,%1@,#7\n\t"
651 "pmove %%psr,%0"
652 : "=m" (temp) : "a" (addr));
653 #endif
654 mmusr = temp;
655 if (mmusr & MMU_I)
656 do_page_fault (&fp->ptregs, addr, 0);
657 else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
658 pr_err("invalid insn access at %#lx from pc %#lx\n",
659 addr, fp->ptregs.pc);
660 pr_debug("Unknown SIGSEGV - 2\n");
661 die_if_kernel("Oops",&fp->ptregs,mmusr);
662 force_sig(SIGSEGV, current);
663 return;
664 }
665
666 create_atc_entry:
667 /* setup an ATC entry for the access about to be retried */
668 asm volatile ("ploadr #2,%0@" : /* no outputs */
669 : "a" (addr));
670 }
671 #endif /* CPU_M68020_OR_M68030 */
672 #endif /* !CONFIG_SUN3 */
673
674 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
675 #include <asm/mcfmmu.h>
676
677 /*
678 * The following table converts the FS encoding of a ColdFire
679 * exception stack frame into the error_code value needed by
680 * do_fault.
681 */
682 static const unsigned char fs_err_code[] = {
683 0, /* 0000 */
684 0, /* 0001 */
685 0, /* 0010 */
686 0, /* 0011 */
687 1, /* 0100 */
688 0, /* 0101 */
689 0, /* 0110 */
690 0, /* 0111 */
691 2, /* 1000 */
692 3, /* 1001 */
693 2, /* 1010 */
694 0, /* 1011 */
695 1, /* 1100 */
696 1, /* 1101 */
697 0, /* 1110 */
698 0 /* 1111 */
699 };
700
701 static inline void access_errorcf(unsigned int fs, struct frame *fp)
702 {
703 unsigned long mmusr, addr;
704 unsigned int err_code;
705 int need_page_fault;
706
707 mmusr = mmu_read(MMUSR);
708 addr = mmu_read(MMUAR);
709
710 /*
711 * error_code:
712 * bit 0 == 0 means no page found, 1 means protection fault
713 * bit 1 == 0 means read, 1 means write
714 */
715 switch (fs) {
716 case 5: /* 0101 TLB opword X miss */
717 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0);
718 addr = fp->ptregs.pc;
719 break;
720 case 6: /* 0110 TLB extension word X miss */
721 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1);
722 addr = fp->ptregs.pc + sizeof(long);
723 break;
724 case 10: /* 1010 TLB W miss */
725 need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0);
726 break;
727 case 14: /* 1110 TLB R miss */
728 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0);
729 break;
730 default:
731 /* 0000 Normal */
732 /* 0001 Reserved */
733 /* 0010 Interrupt during debug service routine */
734 /* 0011 Reserved */
735 /* 0100 X Protection */
736 /* 0111 IFP in emulator mode */
737 /* 1000 W Protection*/
738 /* 1001 Write error*/
739 /* 1011 Reserved*/
740 /* 1100 R Protection*/
741 /* 1101 R Protection*/
742 /* 1111 OEP in emulator mode*/
743 need_page_fault = 1;
744 break;
745 }
746
747 if (need_page_fault) {
748 err_code = fs_err_code[fs];
749 if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */
750 err_code |= 2; /* bit1 - write, bit0 - protection */
751 do_page_fault(&fp->ptregs, addr, err_code);
752 }
753 }
754 #endif /* CONFIG_COLDFIRE CONFIG_MMU */
755
756 asmlinkage void buserr_c(struct frame *fp)
757 {
758 /* Only set esp0 if coming from user mode */
759 if (user_mode(&fp->ptregs))
760 current->thread.esp0 = (unsigned long) fp;
761
762 pr_debug("*** Bus Error *** Format is %x\n", fp->ptregs.format);
763
764 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
765 if (CPU_IS_COLDFIRE) {
766 unsigned int fs;
767 fs = (fp->ptregs.vector & 0x3) |
768 ((fp->ptregs.vector & 0xc00) >> 8);
769 switch (fs) {
770 case 0x5:
771 case 0x6:
772 case 0x7:
773 case 0x9:
774 case 0xa:
775 case 0xd:
776 case 0xe:
777 case 0xf:
778 access_errorcf(fs, fp);
779 return;
780 default:
781 break;
782 }
783 }
784 #endif /* CONFIG_COLDFIRE && CONFIG_MMU */
785
786 switch (fp->ptregs.format) {
787 #if defined (CONFIG_M68060)
788 case 4: /* 68060 access error */
789 access_error060 (fp);
790 break;
791 #endif
792 #if defined (CONFIG_M68040)
793 case 0x7: /* 68040 access error */
794 access_error040 (fp);
795 break;
796 #endif
797 #if defined (CPU_M68020_OR_M68030)
798 case 0xa:
799 case 0xb:
800 bus_error030 (fp);
801 break;
802 #endif
803 default:
804 die_if_kernel("bad frame format",&fp->ptregs,0);
805 pr_debug("Unknown SIGSEGV - 4\n");
806 force_sig(SIGSEGV, current);
807 }
808 }
809
810
811 static int kstack_depth_to_print = 48;
812
813 void show_trace(unsigned long *stack)
814 {
815 unsigned long *endstack;
816 unsigned long addr;
817 int i;
818
819 pr_info("Call Trace:");
820 addr = (unsigned long)stack + THREAD_SIZE - 1;
821 endstack = (unsigned long *)(addr & -THREAD_SIZE);
822 i = 0;
823 while (stack + 1 <= endstack) {
824 addr = *stack++;
825 /*
826 * If the address is either in the text segment of the
827 * kernel, or in the region which contains vmalloc'ed
828 * memory, it *may* be the address of a calling
829 * routine; if so, print it so that someone tracing
830 * down the cause of the crash will be able to figure
831 * out the call path that was taken.
832 */
833 if (__kernel_text_address(addr)) {
834 #ifndef CONFIG_KALLSYMS
835 if (i % 5 == 0)
836 pr_cont("\n ");
837 #endif
838 pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr);
839 i++;
840 }
841 }
842 pr_cont("\n");
843 }
844
845 void show_registers(struct pt_regs *regs)
846 {
847 struct frame *fp = (struct frame *)regs;
848 mm_segment_t old_fs = get_fs();
849 u16 c, *cp;
850 unsigned long addr;
851 int i;
852
853 print_modules();
854 pr_info("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
855 pr_info("SR: %04x SP: %p a2: %08lx\n", regs->sr, regs, regs->a2);
856 pr_info("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
857 regs->d0, regs->d1, regs->d2, regs->d3);
858 pr_info("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
859 regs->d4, regs->d5, regs->a0, regs->a1);
860
861 pr_info("Process %s (pid: %d, task=%p)\n",
862 current->comm, task_pid_nr(current), current);
863 addr = (unsigned long)&fp->un;
864 pr_info("Frame format=%X ", regs->format);
865 switch (regs->format) {
866 case 0x2:
867 pr_cont("instr addr=%08lx\n", fp->un.fmt2.iaddr);
868 addr += sizeof(fp->un.fmt2);
869 break;
870 case 0x3:
871 pr_cont("eff addr=%08lx\n", fp->un.fmt3.effaddr);
872 addr += sizeof(fp->un.fmt3);
873 break;
874 case 0x4:
875 if (CPU_IS_060)
876 pr_cont("fault addr=%08lx fslw=%08lx\n",
877 fp->un.fmt4.effaddr, fp->un.fmt4.pc);
878 else
879 pr_cont("eff addr=%08lx pc=%08lx\n",
880 fp->un.fmt4.effaddr, fp->un.fmt4.pc);
881 addr += sizeof(fp->un.fmt4);
882 break;
883 case 0x7:
884 pr_cont("eff addr=%08lx ssw=%04x faddr=%08lx\n",
885 fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
886 pr_info("wb 1 stat/addr/data: %04x %08lx %08lx\n",
887 fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
888 pr_info("wb 2 stat/addr/data: %04x %08lx %08lx\n",
889 fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
890 pr_info("wb 3 stat/addr/data: %04x %08lx %08lx\n",
891 fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
892 pr_info("push data: %08lx %08lx %08lx %08lx\n",
893 fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
894 fp->un.fmt7.pd3);
895 addr += sizeof(fp->un.fmt7);
896 break;
897 case 0x9:
898 pr_cont("instr addr=%08lx\n", fp->un.fmt9.iaddr);
899 addr += sizeof(fp->un.fmt9);
900 break;
901 case 0xa:
902 pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
903 fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
904 fp->un.fmta.daddr, fp->un.fmta.dobuf);
905 addr += sizeof(fp->un.fmta);
906 break;
907 case 0xb:
908 pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
909 fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
910 fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
911 pr_info("baddr=%08lx dibuf=%08lx ver=%x\n",
912 fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
913 addr += sizeof(fp->un.fmtb);
914 break;
915 default:
916 pr_cont("\n");
917 }
918 show_stack(NULL, (unsigned long *)addr);
919
920 pr_info("Code:");
921 set_fs(KERNEL_DS);
922 cp = (u16 *)regs->pc;
923 for (i = -8; i < 16; i++) {
924 if (get_user(c, cp + i) && i >= 0) {
925 pr_cont(" Bad PC value.");
926 break;
927 }
928 if (i)
929 pr_cont(" %04x", c);
930 else
931 pr_cont(" <%04x>", c);
932 }
933 set_fs(old_fs);
934 pr_cont("\n");
935 }
936
937 void show_stack(struct task_struct *task, unsigned long *stack)
938 {
939 unsigned long *p;
940 unsigned long *endstack;
941 int i;
942
943 if (!stack) {
944 if (task)
945 stack = (unsigned long *)task->thread.esp0;
946 else
947 stack = (unsigned long *)&stack;
948 }
949 endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
950
951 pr_info("Stack from %08lx:", (unsigned long)stack);
952 p = stack;
953 for (i = 0; i < kstack_depth_to_print; i++) {
954 if (p + 1 > endstack)
955 break;
956 if (i % 8 == 0)
957 pr_cont("\n ");
958 pr_cont(" %08lx", *p++);
959 }
960 pr_cont("\n");
961 show_trace(stack);
962 }
963
964 /*
965 * The vector number returned in the frame pointer may also contain
966 * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
967 * 2 bits, and upper 2 bits. So we need to mask out the real vector
968 * number before using it in comparisons. You don't need to do this on
969 * real 68k parts, but it won't hurt either.
970 */
971
972 void bad_super_trap (struct frame *fp)
973 {
974 int vector = (fp->ptregs.vector >> 2) & 0xff;
975
976 console_verbose();
977 if (vector < ARRAY_SIZE(vec_names))
978 pr_err("*** %s *** FORMAT=%X\n",
979 vec_names[vector],
980 fp->ptregs.format);
981 else
982 pr_err("*** Exception %d *** FORMAT=%X\n",
983 vector, fp->ptregs.format);
984 if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
985 unsigned short ssw = fp->un.fmtb.ssw;
986
987 pr_err("SSW=%#06x ", ssw);
988
989 if (ssw & RC)
990 pr_err("Pipe stage C instruction fault at %#010lx\n",
991 (fp->ptregs.format) == 0xA ?
992 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
993 if (ssw & RB)
994 pr_err("Pipe stage B instruction fault at %#010lx\n",
995 (fp->ptregs.format) == 0xA ?
996 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
997 if (ssw & DF)
998 pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
999 ssw & RW ? "read" : "write",
1000 fp->un.fmtb.daddr, space_names[ssw & DFC],
1001 fp->ptregs.pc);
1002 }
1003 pr_err("Current process id is %d\n", task_pid_nr(current));
1004 die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1005 }
1006
1007 asmlinkage void trap_c(struct frame *fp)
1008 {
1009 int sig;
1010 int vector = (fp->ptregs.vector >> 2) & 0xff;
1011 siginfo_t info;
1012
1013 if (fp->ptregs.sr & PS_S) {
1014 if (vector == VEC_TRACE) {
1015 /* traced a trapping instruction on a 68020/30,
1016 * real exception will be executed afterwards.
1017 */
1018 } else if (!handle_kernel_fault(&fp->ptregs))
1019 bad_super_trap(fp);
1020 return;
1021 }
1022
1023 /* send the appropriate signal to the user program */
1024 switch (vector) {
1025 case VEC_ADDRERR:
1026 info.si_code = BUS_ADRALN;
1027 sig = SIGBUS;
1028 break;
1029 case VEC_ILLEGAL:
1030 case VEC_LINE10:
1031 case VEC_LINE11:
1032 info.si_code = ILL_ILLOPC;
1033 sig = SIGILL;
1034 break;
1035 case VEC_PRIV:
1036 info.si_code = ILL_PRVOPC;
1037 sig = SIGILL;
1038 break;
1039 case VEC_COPROC:
1040 info.si_code = ILL_COPROC;
1041 sig = SIGILL;
1042 break;
1043 case VEC_TRAP1:
1044 case VEC_TRAP2:
1045 case VEC_TRAP3:
1046 case VEC_TRAP4:
1047 case VEC_TRAP5:
1048 case VEC_TRAP6:
1049 case VEC_TRAP7:
1050 case VEC_TRAP8:
1051 case VEC_TRAP9:
1052 case VEC_TRAP10:
1053 case VEC_TRAP11:
1054 case VEC_TRAP12:
1055 case VEC_TRAP13:
1056 case VEC_TRAP14:
1057 info.si_code = ILL_ILLTRP;
1058 sig = SIGILL;
1059 break;
1060 case VEC_FPBRUC:
1061 case VEC_FPOE:
1062 case VEC_FPNAN:
1063 info.si_code = FPE_FLTINV;
1064 sig = SIGFPE;
1065 break;
1066 case VEC_FPIR:
1067 info.si_code = FPE_FLTRES;
1068 sig = SIGFPE;
1069 break;
1070 case VEC_FPDIVZ:
1071 info.si_code = FPE_FLTDIV;
1072 sig = SIGFPE;
1073 break;
1074 case VEC_FPUNDER:
1075 info.si_code = FPE_FLTUND;
1076 sig = SIGFPE;
1077 break;
1078 case VEC_FPOVER:
1079 info.si_code = FPE_FLTOVF;
1080 sig = SIGFPE;
1081 break;
1082 case VEC_ZERODIV:
1083 info.si_code = FPE_INTDIV;
1084 sig = SIGFPE;
1085 break;
1086 case VEC_CHK:
1087 case VEC_TRAP:
1088 info.si_code = FPE_INTOVF;
1089 sig = SIGFPE;
1090 break;
1091 case VEC_TRACE: /* ptrace single step */
1092 info.si_code = TRAP_TRACE;
1093 sig = SIGTRAP;
1094 break;
1095 case VEC_TRAP15: /* breakpoint */
1096 info.si_code = TRAP_BRKPT;
1097 sig = SIGTRAP;
1098 break;
1099 default:
1100 info.si_code = ILL_ILLOPC;
1101 sig = SIGILL;
1102 break;
1103 }
1104 info.si_signo = sig;
1105 info.si_errno = 0;
1106 switch (fp->ptregs.format) {
1107 default:
1108 info.si_addr = (void *) fp->ptregs.pc;
1109 break;
1110 case 2:
1111 info.si_addr = (void *) fp->un.fmt2.iaddr;
1112 break;
1113 case 7:
1114 info.si_addr = (void *) fp->un.fmt7.effaddr;
1115 break;
1116 case 9:
1117 info.si_addr = (void *) fp->un.fmt9.iaddr;
1118 break;
1119 case 10:
1120 info.si_addr = (void *) fp->un.fmta.daddr;
1121 break;
1122 case 11:
1123 info.si_addr = (void *) fp->un.fmtb.daddr;
1124 break;
1125 }
1126 force_sig_info (sig, &info, current);
1127 }
1128
1129 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1130 {
1131 if (!(fp->sr & PS_S))
1132 return;
1133
1134 console_verbose();
1135 pr_crit("%s: %08x\n", str, nr);
1136 show_registers(fp);
1137 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
1138 do_exit(SIGSEGV);
1139 }
1140
1141 asmlinkage void set_esp0(unsigned long ssp)
1142 {
1143 current->thread.esp0 = ssp;
1144 }
1145
1146 /*
1147 * This function is called if an error occur while accessing
1148 * user-space from the fpsp040 code.
1149 */
1150 asmlinkage void fpsp040_die(void)
1151 {
1152 do_exit(SIGSEGV);
1153 }
1154
1155 #ifdef CONFIG_M68KFPU_EMU
1156 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1157 {
1158 siginfo_t info;
1159
1160 info.si_signo = signal;
1161 info.si_errno = 0;
1162 info.si_code = code;
1163 info.si_addr = addr;
1164 force_sig_info(signal, &info, current);
1165 }
1166 #endif
Linux with added FPC-III support