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Linux 4.13.16
[linux/fpc-iii.git] / arch / m68k / kernel / traps.c
blobc1cc4e99aa945dd1a14cc6a7561c1b58f3b5f2fa
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, current);
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, current);
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, current);
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, current);
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, current);
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, current);
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, current);
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, current);
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;
1011 int vector = (fp->ptregs.vector >> 2) & 0xff;
1012 siginfo_t info;
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 info.si_code = BUS_ADRALN;
1033 sig = SIGBUS;
1034 break;
1035 case VEC_ILLEGAL:
1036 case VEC_LINE10:
1037 case VEC_LINE11:
1038 info.si_code = ILL_ILLOPC;
1039 sig = SIGILL;
1040 break;
1041 case VEC_PRIV:
1042 info.si_code = ILL_PRVOPC;
1043 sig = SIGILL;
1044 break;
1045 case VEC_COPROC:
1046 info.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 info.si_code = ILL_ILLTRP;
1064 sig = SIGILL;
1065 break;
1066 case VEC_FPBRUC:
1067 case VEC_FPOE:
1068 case VEC_FPNAN:
1069 info.si_code = FPE_FLTINV;
1070 sig = SIGFPE;
1071 break;
1072 case VEC_FPIR:
1073 info.si_code = FPE_FLTRES;
1074 sig = SIGFPE;
1075 break;
1076 case VEC_FPDIVZ:
1077 info.si_code = FPE_FLTDIV;
1078 sig = SIGFPE;
1079 break;
1080 case VEC_FPUNDER:
1081 info.si_code = FPE_FLTUND;
1082 sig = SIGFPE;
1083 break;
1084 case VEC_FPOVER:
1085 info.si_code = FPE_FLTOVF;
1086 sig = SIGFPE;
1087 break;
1088 case VEC_ZERODIV:
1089 info.si_code = FPE_INTDIV;
1090 sig = SIGFPE;
1091 break;
1092 case VEC_CHK:
1093 case VEC_TRAP:
1094 info.si_code = FPE_INTOVF;
1095 sig = SIGFPE;
1096 break;
1097 case VEC_TRACE: /* ptrace single step */
1098 info.si_code = TRAP_TRACE;
1099 sig = SIGTRAP;
1100 break;
1101 case VEC_TRAP15: /* breakpoint */
1102 info.si_code = TRAP_BRKPT;
1103 sig = SIGTRAP;
1104 break;
1105 default:
1106 info.si_code = ILL_ILLOPC;
1107 sig = SIGILL;
1108 break;
1109 }
1110 info.si_signo = sig;
1111 info.si_errno = 0;
1112 switch (fp->ptregs.format) {
1113 default:
1114 info.si_addr = (void *) fp->ptregs.pc;
1115 break;
1116 case 2:
1117 info.si_addr = (void *) fp->un.fmt2.iaddr;
1118 break;
1119 case 7:
1120 info.si_addr = (void *) fp->un.fmt7.effaddr;
1121 break;
1122 case 9:
1123 info.si_addr = (void *) fp->un.fmt9.iaddr;
1124 break;
1125 case 10:
1126 info.si_addr = (void *) fp->un.fmta.daddr;
1127 break;
1128 case 11:
1129 info.si_addr = (void *) fp->un.fmtb.daddr;
1130 break;
1131 }
1132 force_sig_info (sig, &info, current);
1133 }
1134
1135 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1136 {
1137 if (!(fp->sr & PS_S))
1138 return;
1139
1140 console_verbose();
1141 pr_crit("%s: %08x\n", str, nr);
1142 show_registers(fp);
1143 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
1144 do_exit(SIGSEGV);
1145 }
1146
1147 asmlinkage void set_esp0(unsigned long ssp)
1148 {
1149 current->thread.esp0 = ssp;
1150 }
1151
1152 /*
1153 * This function is called if an error occur while accessing
1154 * user-space from the fpsp040 code.
1155 */
1156 asmlinkage void fpsp040_die(void)
1157 {
1158 do_exit(SIGSEGV);
1159 }
1160
1161 #ifdef CONFIG_M68KFPU_EMU
1162 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1163 {
1164 siginfo_t info;
1165
1166 info.si_signo = signal;
1167 info.si_errno = 0;
1168 info.si_code = code;
1169 info.si_addr = addr;
1170 force_sig_info(signal, &info, current);
1171 }
1172 #endif
Linux with added FPC-III support