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sysfs: Remove support for tagged directories with untagged members (again)
[linux-btrfs-devel.git] / arch / m68k / kernel / traps_mm.c
blob4022bbc288782357fa339c17e2254d6462ca6327
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 /* assembler routines */
43 asmlinkage void system_call(void);
44 asmlinkage void buserr(void);
45 asmlinkage void trap(void);
46 asmlinkage void nmihandler(void);
47 #ifdef CONFIG_M68KFPU_EMU
48 asmlinkage void fpu_emu(void);
49 #endif
50
51 e_vector vectors[256];
52
53 /* nmi handler for the Amiga */
54 asm(".text\n"
55 __ALIGN_STR "\n"
56 "nmihandler: rte");
57
58 /*
59 * this must be called very early as the kernel might
60 * use some instruction that are emulated on the 060
61 * and so we're prepared for early probe attempts (e.g. nf_init).
62 */
63 void __init base_trap_init(void)
64 {
65 if (MACH_IS_SUN3X) {
66 extern e_vector *sun3x_prom_vbr;
67
68 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
69 }
70
71 /* setup the exception vector table */
72 __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
73
74 if (CPU_IS_060) {
75 /* set up ISP entry points */
76 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
77
78 vectors[VEC_UNIMPII] = unimp_vec;
79 }
80
81 vectors[VEC_BUSERR] = buserr;
82 vectors[VEC_ILLEGAL] = trap;
83 vectors[VEC_SYS] = system_call;
84 }
85
86 void __init trap_init (void)
87 {
88 int i;
89
90 for (i = VEC_SPUR; i <= VEC_INT7; i++)
91 vectors[i] = bad_inthandler;
92
93 for (i = 0; i < VEC_USER; i++)
94 if (!vectors[i])
95 vectors[i] = trap;
96
97 for (i = VEC_USER; i < 256; i++)
98 vectors[i] = bad_inthandler;
99
100 #ifdef CONFIG_M68KFPU_EMU
101 if (FPU_IS_EMU)
102 vectors[VEC_LINE11] = fpu_emu;
103 #endif
104
105 if (CPU_IS_040 && !FPU_IS_EMU) {
106 /* set up FPSP entry points */
107 asmlinkage void dz_vec(void) asm ("dz");
108 asmlinkage void inex_vec(void) asm ("inex");
109 asmlinkage void ovfl_vec(void) asm ("ovfl");
110 asmlinkage void unfl_vec(void) asm ("unfl");
111 asmlinkage void snan_vec(void) asm ("snan");
112 asmlinkage void operr_vec(void) asm ("operr");
113 asmlinkage void bsun_vec(void) asm ("bsun");
114 asmlinkage void fline_vec(void) asm ("fline");
115 asmlinkage void unsupp_vec(void) asm ("unsupp");
116
117 vectors[VEC_FPDIVZ] = dz_vec;
118 vectors[VEC_FPIR] = inex_vec;
119 vectors[VEC_FPOVER] = ovfl_vec;
120 vectors[VEC_FPUNDER] = unfl_vec;
121 vectors[VEC_FPNAN] = snan_vec;
122 vectors[VEC_FPOE] = operr_vec;
123 vectors[VEC_FPBRUC] = bsun_vec;
124 vectors[VEC_LINE11] = fline_vec;
125 vectors[VEC_FPUNSUP] = unsupp_vec;
126 }
127
128 if (CPU_IS_060 && !FPU_IS_EMU) {
129 /* set up IFPSP entry points */
130 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
131 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
132 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
133 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
134 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
135 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
136 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
137 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
138 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
139
140 vectors[VEC_FPNAN] = snan_vec6;
141 vectors[VEC_FPOE] = operr_vec6;
142 vectors[VEC_FPOVER] = ovfl_vec6;
143 vectors[VEC_FPUNDER] = unfl_vec6;
144 vectors[VEC_FPDIVZ] = dz_vec6;
145 vectors[VEC_FPIR] = inex_vec6;
146 vectors[VEC_LINE11] = fline_vec6;
147 vectors[VEC_FPUNSUP] = unsupp_vec6;
148 vectors[VEC_UNIMPEA] = effadd_vec6;
149 }
150
151 /* if running on an amiga, make the NMI interrupt do nothing */
152 if (MACH_IS_AMIGA) {
153 vectors[VEC_INT7] = nmihandler;
154 }
155 }
156
157
158 static const char *vec_names[] = {
159 [VEC_RESETSP] = "RESET SP",
160 [VEC_RESETPC] = "RESET PC",
161 [VEC_BUSERR] = "BUS ERROR",
162 [VEC_ADDRERR] = "ADDRESS ERROR",
163 [VEC_ILLEGAL] = "ILLEGAL INSTRUCTION",
164 [VEC_ZERODIV] = "ZERO DIVIDE",
165 [VEC_CHK] = "CHK",
166 [VEC_TRAP] = "TRAPcc",
167 [VEC_PRIV] = "PRIVILEGE VIOLATION",
168 [VEC_TRACE] = "TRACE",
169 [VEC_LINE10] = "LINE 1010",
170 [VEC_LINE11] = "LINE 1111",
171 [VEC_RESV12] = "UNASSIGNED RESERVED 12",
172 [VEC_COPROC] = "COPROCESSOR PROTOCOL VIOLATION",
173 [VEC_FORMAT] = "FORMAT ERROR",
174 [VEC_UNINT] = "UNINITIALIZED INTERRUPT",
175 [VEC_RESV16] = "UNASSIGNED RESERVED 16",
176 [VEC_RESV17] = "UNASSIGNED RESERVED 17",
177 [VEC_RESV18] = "UNASSIGNED RESERVED 18",
178 [VEC_RESV19] = "UNASSIGNED RESERVED 19",
179 [VEC_RESV20] = "UNASSIGNED RESERVED 20",
180 [VEC_RESV21] = "UNASSIGNED RESERVED 21",
181 [VEC_RESV22] = "UNASSIGNED RESERVED 22",
182 [VEC_RESV23] = "UNASSIGNED RESERVED 23",
183 [VEC_SPUR] = "SPURIOUS INTERRUPT",
184 [VEC_INT1] = "LEVEL 1 INT",
185 [VEC_INT2] = "LEVEL 2 INT",
186 [VEC_INT3] = "LEVEL 3 INT",
187 [VEC_INT4] = "LEVEL 4 INT",
188 [VEC_INT5] = "LEVEL 5 INT",
189 [VEC_INT6] = "LEVEL 6 INT",
190 [VEC_INT7] = "LEVEL 7 INT",
191 [VEC_SYS] = "SYSCALL",
192 [VEC_TRAP1] = "TRAP #1",
193 [VEC_TRAP2] = "TRAP #2",
194 [VEC_TRAP3] = "TRAP #3",
195 [VEC_TRAP4] = "TRAP #4",
196 [VEC_TRAP5] = "TRAP #5",
197 [VEC_TRAP6] = "TRAP #6",
198 [VEC_TRAP7] = "TRAP #7",
199 [VEC_TRAP8] = "TRAP #8",
200 [VEC_TRAP9] = "TRAP #9",
201 [VEC_TRAP10] = "TRAP #10",
202 [VEC_TRAP11] = "TRAP #11",
203 [VEC_TRAP12] = "TRAP #12",
204 [VEC_TRAP13] = "TRAP #13",
205 [VEC_TRAP14] = "TRAP #14",
206 [VEC_TRAP15] = "TRAP #15",
207 [VEC_FPBRUC] = "FPCP BSUN",
208 [VEC_FPIR] = "FPCP INEXACT",
209 [VEC_FPDIVZ] = "FPCP DIV BY 0",
210 [VEC_FPUNDER] = "FPCP UNDERFLOW",
211 [VEC_FPOE] = "FPCP OPERAND ERROR",
212 [VEC_FPOVER] = "FPCP OVERFLOW",
213 [VEC_FPNAN] = "FPCP SNAN",
214 [VEC_FPUNSUP] = "FPCP UNSUPPORTED OPERATION",
215 [VEC_MMUCFG] = "MMU CONFIGURATION ERROR",
216 [VEC_MMUILL] = "MMU ILLEGAL OPERATION ERROR",
217 [VEC_MMUACC] = "MMU ACCESS LEVEL VIOLATION ERROR",
218 [VEC_RESV59] = "UNASSIGNED RESERVED 59",
219 [VEC_UNIMPEA] = "UNASSIGNED RESERVED 60",
220 [VEC_UNIMPII] = "UNASSIGNED RESERVED 61",
221 [VEC_RESV62] = "UNASSIGNED RESERVED 62",
222 [VEC_RESV63] = "UNASSIGNED RESERVED 63",
223 };
224
225 static const char *space_names[] = {
226 [0] = "Space 0",
227 [USER_DATA] = "User Data",
228 [USER_PROGRAM] = "User Program",
229 #ifndef CONFIG_SUN3
230 [3] = "Space 3",
231 #else
232 [FC_CONTROL] = "Control",
233 #endif
234 [4] = "Space 4",
235 [SUPER_DATA] = "Super Data",
236 [SUPER_PROGRAM] = "Super Program",
237 [CPU_SPACE] = "CPU"
238 };
239
240 void die_if_kernel(char *,struct pt_regs *,int);
241 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
242 unsigned long error_code);
243 int send_fault_sig(struct pt_regs *regs);
244
245 asmlinkage void trap_c(struct frame *fp);
246
247 #if defined (CONFIG_M68060)
248 static inline void access_error060 (struct frame *fp)
249 {
250 unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
251
252 #ifdef DEBUG
253 printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
254 #endif
255
256 if (fslw & MMU060_BPE) {
257 /* branch prediction error -> clear branch cache */
258 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
259 "orl #0x00400000,%/d0\n\t"
260 "movec %/d0,%/cacr"
261 : : : "d0" );
262 /* return if there's no other error */
263 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
264 return;
265 }
266
267 if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
268 unsigned long errorcode;
269 unsigned long addr = fp->un.fmt4.effaddr;
270
271 if (fslw & MMU060_MA)
272 addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
273
274 errorcode = 1;
275 if (fslw & MMU060_DESC_ERR) {
276 __flush_tlb040_one(addr);
277 errorcode = 0;
278 }
279 if (fslw & MMU060_W)
280 errorcode |= 2;
281 #ifdef DEBUG
282 printk("errorcode = %d\n", errorcode );
283 #endif
284 do_page_fault(&fp->ptregs, addr, errorcode);
285 } else if (fslw & (MMU060_SEE)){
286 /* Software Emulation Error.
287 * fault during mem_read/mem_write in ifpsp060/os.S
288 */
289 send_fault_sig(&fp->ptregs);
290 } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
291 send_fault_sig(&fp->ptregs) > 0) {
292 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
293 printk( "68060 access error, fslw=%lx\n", fslw );
294 trap_c( fp );
295 }
296 }
297 #endif /* CONFIG_M68060 */
298
299 #if defined (CONFIG_M68040)
300 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
301 {
302 unsigned long mmusr;
303 mm_segment_t old_fs = get_fs();
304
305 set_fs(MAKE_MM_SEG(wbs));
306
307 if (iswrite)
308 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
309 else
310 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
311
312 asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
313
314 set_fs(old_fs);
315
316 return mmusr;
317 }
318
319 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
320 unsigned long wbd)
321 {
322 int res = 0;
323 mm_segment_t old_fs = get_fs();
324
325 /* set_fs can not be moved, otherwise put_user() may oops */
326 set_fs(MAKE_MM_SEG(wbs));
327
328 switch (wbs & WBSIZ_040) {
329 case BA_SIZE_BYTE:
330 res = put_user(wbd & 0xff, (char __user *)wba);
331 break;
332 case BA_SIZE_WORD:
333 res = put_user(wbd & 0xffff, (short __user *)wba);
334 break;
335 case BA_SIZE_LONG:
336 res = put_user(wbd, (int __user *)wba);
337 break;
338 }
339
340 /* set_fs can not be moved, otherwise put_user() may oops */
341 set_fs(old_fs);
342
343
344 #ifdef DEBUG
345 printk("do_040writeback1, res=%d\n",res);
346 #endif
347
348 return res;
349 }
350
351 /* after an exception in a writeback the stack frame corresponding
352 * to that exception is discarded, set a few bits in the old frame
353 * to simulate what it should look like
354 */
355 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
356 {
357 fp->un.fmt7.faddr = wba;
358 fp->un.fmt7.ssw = wbs & 0xff;
359 if (wba != current->thread.faddr)
360 fp->un.fmt7.ssw |= MA_040;
361 }
362
363 static inline void do_040writebacks(struct frame *fp)
364 {
365 int res = 0;
366 #if 0
367 if (fp->un.fmt7.wb1s & WBV_040)
368 printk("access_error040: cannot handle 1st writeback. oops.\n");
369 #endif
370
371 if ((fp->un.fmt7.wb2s & WBV_040) &&
372 !(fp->un.fmt7.wb2s & WBTT_040)) {
373 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
374 fp->un.fmt7.wb2d);
375 if (res)
376 fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
377 else
378 fp->un.fmt7.wb2s = 0;
379 }
380
381 /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
382 if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
383 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
384 fp->un.fmt7.wb3d);
385 if (res)
386 {
387 fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
388
389 fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
390 fp->un.fmt7.wb3s &= (~WBV_040);
391 fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
392 fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
393 }
394 else
395 fp->un.fmt7.wb3s = 0;
396 }
397
398 if (res)
399 send_fault_sig(&fp->ptregs);
400 }
401
402 /*
403 * called from sigreturn(), must ensure userspace code didn't
404 * manipulate exception frame to circumvent protection, then complete
405 * pending writebacks
406 * we just clear TM2 to turn it into a userspace access
407 */
408 asmlinkage void berr_040cleanup(struct frame *fp)
409 {
410 fp->un.fmt7.wb2s &= ~4;
411 fp->un.fmt7.wb3s &= ~4;
412
413 do_040writebacks(fp);
414 }
415
416 static inline void access_error040(struct frame *fp)
417 {
418 unsigned short ssw = fp->un.fmt7.ssw;
419 unsigned long mmusr;
420
421 #ifdef DEBUG
422 printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
423 printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
424 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
425 printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
426 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
427 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
428 #endif
429
430 if (ssw & ATC_040) {
431 unsigned long addr = fp->un.fmt7.faddr;
432 unsigned long errorcode;
433
434 /*
435 * The MMU status has to be determined AFTER the address
436 * has been corrected if there was a misaligned access (MA).
437 */
438 if (ssw & MA_040)
439 addr = (addr + 7) & -8;
440
441 /* MMU error, get the MMUSR info for this access */
442 mmusr = probe040(!(ssw & RW_040), addr, ssw);
443 #ifdef DEBUG
444 printk("mmusr = %lx\n", mmusr);
445 #endif
446 errorcode = 1;
447 if (!(mmusr & MMU_R_040)) {
448 /* clear the invalid atc entry */
449 __flush_tlb040_one(addr);
450 errorcode = 0;
451 }
452
453 /* despite what documentation seems to say, RMW
454 * accesses have always both the LK and RW bits set */
455 if (!(ssw & RW_040) || (ssw & LK_040))
456 errorcode |= 2;
457
458 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
459 #ifdef DEBUG
460 printk("do_page_fault() !=0\n");
461 #endif
462 if (user_mode(&fp->ptregs)){
463 /* delay writebacks after signal delivery */
464 #ifdef DEBUG
465 printk(".. was usermode - return\n");
466 #endif
467 return;
468 }
469 /* disable writeback into user space from kernel
470 * (if do_page_fault didn't fix the mapping,
471 * the writeback won't do good)
472 */
473 disable_wb:
474 #ifdef DEBUG
475 printk(".. disabling wb2\n");
476 #endif
477 if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
478 fp->un.fmt7.wb2s &= ~WBV_040;
479 if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
480 fp->un.fmt7.wb3s &= ~WBV_040;
481 }
482 } else {
483 /* In case of a bus error we either kill the process or expect
484 * the kernel to catch the fault, which then is also responsible
485 * for cleaning up the mess.
486 */
487 current->thread.signo = SIGBUS;
488 current->thread.faddr = fp->un.fmt7.faddr;
489 if (send_fault_sig(&fp->ptregs) >= 0)
490 printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
491 fp->un.fmt7.faddr);
492 goto disable_wb;
493 }
494
495 do_040writebacks(fp);
496 }
497 #endif /* CONFIG_M68040 */
498
499 #if defined(CONFIG_SUN3)
500 #include <asm/sun3mmu.h>
501
502 extern int mmu_emu_handle_fault (unsigned long, int, int);
503
504 /* sun3 version of bus_error030 */
505
506 static inline void bus_error030 (struct frame *fp)
507 {
508 unsigned char buserr_type = sun3_get_buserr ();
509 unsigned long addr, errorcode;
510 unsigned short ssw = fp->un.fmtb.ssw;
511 extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
512
513 #ifdef DEBUG
514 if (ssw & (FC | FB))
515 printk ("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 printk ("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 #endif
526
527 /*
528 * Check if this page should be demand-mapped. This needs to go before
529 * the testing for a bad kernel-space access (demand-mapping applies
530 * to kernel accesses too).
531 */
532
533 if ((ssw & DF)
534 && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
535 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
536 return;
537 }
538
539 /* Check for kernel-space pagefault (BAD). */
540 if (fp->ptregs.sr & PS_S) {
541 /* kernel fault must be a data fault to user space */
542 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
543 // try checking the kernel mappings before surrender
544 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
545 return;
546 /* instruction fault or kernel data fault! */
547 if (ssw & (FC | FB))
548 printk ("Instruction fault at %#010lx\n",
549 fp->ptregs.pc);
550 if (ssw & DF) {
551 /* was this fault incurred testing bus mappings? */
552 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
553 (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
554 send_fault_sig(&fp->ptregs);
555 return;
556 }
557
558 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
559 ssw & RW ? "read" : "write",
560 fp->un.fmtb.daddr,
561 space_names[ssw & DFC], fp->ptregs.pc);
562 }
563 printk ("BAD KERNEL BUSERR\n");
564
565 die_if_kernel("Oops", &fp->ptregs,0);
566 force_sig(SIGKILL, current);
567 return;
568 }
569 } else {
570 /* user fault */
571 if (!(ssw & (FC | FB)) && !(ssw & DF))
572 /* not an instruction fault or data fault! BAD */
573 panic ("USER BUSERR w/o instruction or data fault");
574 }
575
576
577 /* First handle the data fault, if any. */
578 if (ssw & DF) {
579 addr = fp->un.fmtb.daddr;
580
581 // errorcode bit 0: 0 -> no page 1 -> protection fault
582 // errorcode bit 1: 0 -> read fault 1 -> write fault
583
584 // (buserr_type & SUN3_BUSERR_PROTERR) -> protection fault
585 // (buserr_type & SUN3_BUSERR_INVALID) -> invalid page fault
586
587 if (buserr_type & SUN3_BUSERR_PROTERR)
588 errorcode = 0x01;
589 else if (buserr_type & SUN3_BUSERR_INVALID)
590 errorcode = 0x00;
591 else {
592 #ifdef DEBUG
593 printk ("*** unexpected busfault type=%#04x\n", buserr_type);
594 printk ("invalid %s access at %#lx from pc %#lx\n",
595 !(ssw & RW) ? "write" : "read", addr,
596 fp->ptregs.pc);
597 #endif
598 die_if_kernel ("Oops", &fp->ptregs, buserr_type);
599 force_sig (SIGBUS, current);
600 return;
601 }
602
603 //todo: wtf is RM bit? --m
604 if (!(ssw & RW) || ssw & RM)
605 errorcode |= 0x02;
606
607 /* Handle page fault. */
608 do_page_fault (&fp->ptregs, addr, errorcode);
609
610 /* Retry the data fault now. */
611 return;
612 }
613
614 /* Now handle the instruction fault. */
615
616 /* Get the fault address. */
617 if (fp->ptregs.format == 0xA)
618 addr = fp->ptregs.pc + 4;
619 else
620 addr = fp->un.fmtb.baddr;
621 if (ssw & FC)
622 addr -= 2;
623
624 if (buserr_type & SUN3_BUSERR_INVALID) {
625 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
626 do_page_fault (&fp->ptregs, addr, 0);
627 } else {
628 #ifdef DEBUG
629 printk ("protection fault on insn access (segv).\n");
630 #endif
631 force_sig (SIGSEGV, current);
632 }
633 }
634 #else
635 #if defined(CPU_M68020_OR_M68030)
636 static inline void bus_error030 (struct frame *fp)
637 {
638 volatile unsigned short temp;
639 unsigned short mmusr;
640 unsigned long addr, errorcode;
641 unsigned short ssw = fp->un.fmtb.ssw;
642 #ifdef DEBUG
643 unsigned long desc;
644
645 printk ("pid = %x ", current->pid);
646 printk ("SSW=%#06x ", ssw);
647
648 if (ssw & (FC | FB))
649 printk ("Instruction fault at %#010lx\n",
650 ssw & FC ?
651 fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
652 :
653 fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
654 if (ssw & DF)
655 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
656 ssw & RW ? "read" : "write",
657 fp->un.fmtb.daddr,
658 space_names[ssw & DFC], fp->ptregs.pc);
659 #endif
660
661 /* ++andreas: If a data fault and an instruction fault happen
662 at the same time map in both pages. */
663
664 /* First handle the data fault, if any. */
665 if (ssw & DF) {
666 addr = fp->un.fmtb.daddr;
667
668 #ifdef DEBUG
669 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
670 "pmove %%psr,%1@"
671 : "=a&" (desc)
672 : "a" (&temp), "a" (addr), "d" (ssw));
673 #else
674 asm volatile ("ptestr %2,%1@,#7\n\t"
675 "pmove %%psr,%0@"
676 : : "a" (&temp), "a" (addr), "d" (ssw));
677 #endif
678 mmusr = temp;
679
680 #ifdef DEBUG
681 printk("mmusr is %#x for addr %#lx in task %p\n",
682 mmusr, addr, current);
683 printk("descriptor address is %#lx, contents %#lx\n",
684 __va(desc), *(unsigned long *)__va(desc));
685 #endif
686
687 errorcode = (mmusr & MMU_I) ? 0 : 1;
688 if (!(ssw & RW) || (ssw & RM))
689 errorcode |= 2;
690
691 if (mmusr & (MMU_I | MMU_WP)) {
692 if (ssw & 4) {
693 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
694 ssw & RW ? "read" : "write",
695 fp->un.fmtb.daddr,
696 space_names[ssw & DFC], fp->ptregs.pc);
697 goto buserr;
698 }
699 /* Don't try to do anything further if an exception was
700 handled. */
701 if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
702 return;
703 } else if (!(mmusr & MMU_I)) {
704 /* probably a 020 cas fault */
705 if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
706 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
707 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
708 printk("invalid %s access at %#lx from pc %#lx\n",
709 !(ssw & RW) ? "write" : "read", addr,
710 fp->ptregs.pc);
711 die_if_kernel("Oops",&fp->ptregs,mmusr);
712 force_sig(SIGSEGV, current);
713 return;
714 } else {
715 #if 0
716 static volatile long tlong;
717 #endif
718
719 printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
720 !(ssw & RW) ? "write" : "read", addr,
721 fp->ptregs.pc, ssw);
722 asm volatile ("ptestr #1,%1@,#0\n\t"
723 "pmove %%psr,%0@"
724 : /* no outputs */
725 : "a" (&temp), "a" (addr));
726 mmusr = temp;
727
728 printk ("level 0 mmusr is %#x\n", mmusr);
729 #if 0
730 asm volatile ("pmove %%tt0,%0@"
731 : /* no outputs */
732 : "a" (&tlong));
733 printk("tt0 is %#lx, ", tlong);
734 asm volatile ("pmove %%tt1,%0@"
735 : /* no outputs */
736 : "a" (&tlong));
737 printk("tt1 is %#lx\n", tlong);
738 #endif
739 #ifdef DEBUG
740 printk("Unknown SIGSEGV - 1\n");
741 #endif
742 die_if_kernel("Oops",&fp->ptregs,mmusr);
743 force_sig(SIGSEGV, current);
744 return;
745 }
746
747 /* setup an ATC entry for the access about to be retried */
748 if (!(ssw & RW) || (ssw & RM))
749 asm volatile ("ploadw %1,%0@" : /* no outputs */
750 : "a" (addr), "d" (ssw));
751 else
752 asm volatile ("ploadr %1,%0@" : /* no outputs */
753 : "a" (addr), "d" (ssw));
754 }
755
756 /* Now handle the instruction fault. */
757
758 if (!(ssw & (FC|FB)))
759 return;
760
761 if (fp->ptregs.sr & PS_S) {
762 printk("Instruction fault at %#010lx\n",
763 fp->ptregs.pc);
764 buserr:
765 printk ("BAD KERNEL BUSERR\n");
766 die_if_kernel("Oops",&fp->ptregs,0);
767 force_sig(SIGKILL, current);
768 return;
769 }
770
771 /* get the fault address */
772 if (fp->ptregs.format == 10)
773 addr = fp->ptregs.pc + 4;
774 else
775 addr = fp->un.fmtb.baddr;
776 if (ssw & FC)
777 addr -= 2;
778
779 if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
780 /* Insn fault on same page as data fault. But we
781 should still create the ATC entry. */
782 goto create_atc_entry;
783
784 #ifdef DEBUG
785 asm volatile ("ptestr #1,%2@,#7,%0\n\t"
786 "pmove %%psr,%1@"
787 : "=a&" (desc)
788 : "a" (&temp), "a" (addr));
789 #else
790 asm volatile ("ptestr #1,%1@,#7\n\t"
791 "pmove %%psr,%0@"
792 : : "a" (&temp), "a" (addr));
793 #endif
794 mmusr = temp;
795
796 #ifdef DEBUG
797 printk ("mmusr is %#x for addr %#lx in task %p\n",
798 mmusr, addr, current);
799 printk ("descriptor address is %#lx, contents %#lx\n",
800 __va(desc), *(unsigned long *)__va(desc));
801 #endif
802
803 if (mmusr & MMU_I)
804 do_page_fault (&fp->ptregs, addr, 0);
805 else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
806 printk ("invalid insn access at %#lx from pc %#lx\n",
807 addr, fp->ptregs.pc);
808 #ifdef DEBUG
809 printk("Unknown SIGSEGV - 2\n");
810 #endif
811 die_if_kernel("Oops",&fp->ptregs,mmusr);
812 force_sig(SIGSEGV, current);
813 return;
814 }
815
816 create_atc_entry:
817 /* setup an ATC entry for the access about to be retried */
818 asm volatile ("ploadr #2,%0@" : /* no outputs */
819 : "a" (addr));
820 }
821 #endif /* CPU_M68020_OR_M68030 */
822 #endif /* !CONFIG_SUN3 */
823
824 asmlinkage void buserr_c(struct frame *fp)
825 {
826 /* Only set esp0 if coming from user mode */
827 if (user_mode(&fp->ptregs))
828 current->thread.esp0 = (unsigned long) fp;
829
830 #ifdef DEBUG
831 printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
832 #endif
833
834 switch (fp->ptregs.format) {
835 #if defined (CONFIG_M68060)
836 case 4: /* 68060 access error */
837 access_error060 (fp);
838 break;
839 #endif
840 #if defined (CONFIG_M68040)
841 case 0x7: /* 68040 access error */
842 access_error040 (fp);
843 break;
844 #endif
845 #if defined (CPU_M68020_OR_M68030)
846 case 0xa:
847 case 0xb:
848 bus_error030 (fp);
849 break;
850 #endif
851 default:
852 die_if_kernel("bad frame format",&fp->ptregs,0);
853 #ifdef DEBUG
854 printk("Unknown SIGSEGV - 4\n");
855 #endif
856 force_sig(SIGSEGV, current);
857 }
858 }
859
860
861 static int kstack_depth_to_print = 48;
862
863 void show_trace(unsigned long *stack)
864 {
865 unsigned long *endstack;
866 unsigned long addr;
867 int i;
868
869 printk("Call Trace:");
870 addr = (unsigned long)stack + THREAD_SIZE - 1;
871 endstack = (unsigned long *)(addr & -THREAD_SIZE);
872 i = 0;
873 while (stack + 1 <= endstack) {
874 addr = *stack++;
875 /*
876 * If the address is either in the text segment of the
877 * kernel, or in the region which contains vmalloc'ed
878 * memory, it *may* be the address of a calling
879 * routine; if so, print it so that someone tracing
880 * down the cause of the crash will be able to figure
881 * out the call path that was taken.
882 */
883 if (__kernel_text_address(addr)) {
884 #ifndef CONFIG_KALLSYMS
885 if (i % 5 == 0)
886 printk("\n ");
887 #endif
888 printk(" [<%08lx>] %pS\n", addr, (void *)addr);
889 i++;
890 }
891 }
892 printk("\n");
893 }
894
895 void show_registers(struct pt_regs *regs)
896 {
897 struct frame *fp = (struct frame *)regs;
898 mm_segment_t old_fs = get_fs();
899 u16 c, *cp;
900 unsigned long addr;
901 int i;
902
903 print_modules();
904 printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
905 printk("SR: %04x SP: %p a2: %08lx\n", regs->sr, regs, regs->a2);
906 printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
907 regs->d0, regs->d1, regs->d2, regs->d3);
908 printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
909 regs->d4, regs->d5, regs->a0, regs->a1);
910
911 printk("Process %s (pid: %d, task=%p)\n",
912 current->comm, task_pid_nr(current), current);
913 addr = (unsigned long)&fp->un;
914 printk("Frame format=%X ", regs->format);
915 switch (regs->format) {
916 case 0x2:
917 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
918 addr += sizeof(fp->un.fmt2);
919 break;
920 case 0x3:
921 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
922 addr += sizeof(fp->un.fmt3);
923 break;
924 case 0x4:
925 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
926 : "eff addr=%08lx pc=%08lx\n"),
927 fp->un.fmt4.effaddr, fp->un.fmt4.pc);
928 addr += sizeof(fp->un.fmt4);
929 break;
930 case 0x7:
931 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
932 fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
933 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
934 fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
935 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
936 fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
937 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
938 fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
939 printk("push data: %08lx %08lx %08lx %08lx\n",
940 fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
941 fp->un.fmt7.pd3);
942 addr += sizeof(fp->un.fmt7);
943 break;
944 case 0x9:
945 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
946 addr += sizeof(fp->un.fmt9);
947 break;
948 case 0xa:
949 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
950 fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
951 fp->un.fmta.daddr, fp->un.fmta.dobuf);
952 addr += sizeof(fp->un.fmta);
953 break;
954 case 0xb:
955 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
956 fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
957 fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
958 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
959 fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
960 addr += sizeof(fp->un.fmtb);
961 break;
962 default:
963 printk("\n");
964 }
965 show_stack(NULL, (unsigned long *)addr);
966
967 printk("Code:");
968 set_fs(KERNEL_DS);
969 cp = (u16 *)regs->pc;
970 for (i = -8; i < 16; i++) {
971 if (get_user(c, cp + i) && i >= 0) {
972 printk(" Bad PC value.");
973 break;
974 }
975 printk(i ? " %04x" : " <%04x>", c);
976 }
977 set_fs(old_fs);
978 printk ("\n");
979 }
980
981 void show_stack(struct task_struct *task, unsigned long *stack)
982 {
983 unsigned long *p;
984 unsigned long *endstack;
985 int i;
986
987 if (!stack) {
988 if (task)
989 stack = (unsigned long *)task->thread.esp0;
990 else
991 stack = (unsigned long *)&stack;
992 }
993 endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
994
995 printk("Stack from %08lx:", (unsigned long)stack);
996 p = stack;
997 for (i = 0; i < kstack_depth_to_print; i++) {
998 if (p + 1 > endstack)
999 break;
1000 if (i % 8 == 0)
1001 printk("\n ");
1002 printk(" %08lx", *p++);
1003 }
1004 printk("\n");
1005 show_trace(stack);
1006 }
1007
1008 /*
1009 * The architecture-independent backtrace generator
1010 */
1011 void dump_stack(void)
1012 {
1013 unsigned long stack;
1014
1015 show_trace(&stack);
1016 }
1017
1018 EXPORT_SYMBOL(dump_stack);
1019
1020 void bad_super_trap (struct frame *fp)
1021 {
1022 console_verbose();
1023 if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
1024 printk ("*** %s *** FORMAT=%X\n",
1025 vec_names[(fp->ptregs.vector) >> 2],
1026 fp->ptregs.format);
1027 else
1028 printk ("*** Exception %d *** FORMAT=%X\n",
1029 (fp->ptregs.vector) >> 2,
1030 fp->ptregs.format);
1031 if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1032 unsigned short ssw = fp->un.fmtb.ssw;
1033
1034 printk ("SSW=%#06x ", ssw);
1035
1036 if (ssw & RC)
1037 printk ("Pipe stage C instruction fault at %#010lx\n",
1038 (fp->ptregs.format) == 0xA ?
1039 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1040 if (ssw & RB)
1041 printk ("Pipe stage B instruction fault at %#010lx\n",
1042 (fp->ptregs.format) == 0xA ?
1043 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1044 if (ssw & DF)
1045 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1046 ssw & RW ? "read" : "write",
1047 fp->un.fmtb.daddr, space_names[ssw & DFC],
1048 fp->ptregs.pc);
1049 }
1050 printk ("Current process id is %d\n", task_pid_nr(current));
1051 die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1052 }
1053
1054 asmlinkage void trap_c(struct frame *fp)
1055 {
1056 int sig;
1057 siginfo_t info;
1058
1059 if (fp->ptregs.sr & PS_S) {
1060 if (fp->ptregs.vector == VEC_TRACE << 2) {
1061 /* traced a trapping instruction on a 68020/30,
1062 * real exception will be executed afterwards.
1063 */
1064 } else if (!handle_kernel_fault(&fp->ptregs))
1065 bad_super_trap(fp);
1066 return;
1067 }
1068
1069 /* send the appropriate signal to the user program */
1070 switch ((fp->ptregs.vector) >> 2) {
1071 case VEC_ADDRERR:
1072 info.si_code = BUS_ADRALN;
1073 sig = SIGBUS;
1074 break;
1075 case VEC_ILLEGAL:
1076 case VEC_LINE10:
1077 case VEC_LINE11:
1078 info.si_code = ILL_ILLOPC;
1079 sig = SIGILL;
1080 break;
1081 case VEC_PRIV:
1082 info.si_code = ILL_PRVOPC;
1083 sig = SIGILL;
1084 break;
1085 case VEC_COPROC:
1086 info.si_code = ILL_COPROC;
1087 sig = SIGILL;
1088 break;
1089 case VEC_TRAP1:
1090 case VEC_TRAP2:
1091 case VEC_TRAP3:
1092 case VEC_TRAP4:
1093 case VEC_TRAP5:
1094 case VEC_TRAP6:
1095 case VEC_TRAP7:
1096 case VEC_TRAP8:
1097 case VEC_TRAP9:
1098 case VEC_TRAP10:
1099 case VEC_TRAP11:
1100 case VEC_TRAP12:
1101 case VEC_TRAP13:
1102 case VEC_TRAP14:
1103 info.si_code = ILL_ILLTRP;
1104 sig = SIGILL;
1105 break;
1106 case VEC_FPBRUC:
1107 case VEC_FPOE:
1108 case VEC_FPNAN:
1109 info.si_code = FPE_FLTINV;
1110 sig = SIGFPE;
1111 break;
1112 case VEC_FPIR:
1113 info.si_code = FPE_FLTRES;
1114 sig = SIGFPE;
1115 break;
1116 case VEC_FPDIVZ:
1117 info.si_code = FPE_FLTDIV;
1118 sig = SIGFPE;
1119 break;
1120 case VEC_FPUNDER:
1121 info.si_code = FPE_FLTUND;
1122 sig = SIGFPE;
1123 break;
1124 case VEC_FPOVER:
1125 info.si_code = FPE_FLTOVF;
1126 sig = SIGFPE;
1127 break;
1128 case VEC_ZERODIV:
1129 info.si_code = FPE_INTDIV;
1130 sig = SIGFPE;
1131 break;
1132 case VEC_CHK:
1133 case VEC_TRAP:
1134 info.si_code = FPE_INTOVF;
1135 sig = SIGFPE;
1136 break;
1137 case VEC_TRACE: /* ptrace single step */
1138 info.si_code = TRAP_TRACE;
1139 sig = SIGTRAP;
1140 break;
1141 case VEC_TRAP15: /* breakpoint */
1142 info.si_code = TRAP_BRKPT;
1143 sig = SIGTRAP;
1144 break;
1145 default:
1146 info.si_code = ILL_ILLOPC;
1147 sig = SIGILL;
1148 break;
1149 }
1150 info.si_signo = sig;
1151 info.si_errno = 0;
1152 switch (fp->ptregs.format) {
1153 default:
1154 info.si_addr = (void *) fp->ptregs.pc;
1155 break;
1156 case 2:
1157 info.si_addr = (void *) fp->un.fmt2.iaddr;
1158 break;
1159 case 7:
1160 info.si_addr = (void *) fp->un.fmt7.effaddr;
1161 break;
1162 case 9:
1163 info.si_addr = (void *) fp->un.fmt9.iaddr;
1164 break;
1165 case 10:
1166 info.si_addr = (void *) fp->un.fmta.daddr;
1167 break;
1168 case 11:
1169 info.si_addr = (void *) fp->un.fmtb.daddr;
1170 break;
1171 }
1172 force_sig_info (sig, &info, current);
1173 }
1174
1175 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1176 {
1177 if (!(fp->sr & PS_S))
1178 return;
1179
1180 console_verbose();
1181 printk("%s: %08x\n",str,nr);
1182 show_registers(fp);
1183 add_taint(TAINT_DIE);
1184 do_exit(SIGSEGV);
1185 }
1186
1187 /*
1188 * This function is called if an error occur while accessing
1189 * user-space from the fpsp040 code.
1190 */
1191 asmlinkage void fpsp040_die(void)
1192 {
1193 do_exit(SIGSEGV);
1194 }
1195
1196 #ifdef CONFIG_M68KFPU_EMU
1197 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1198 {
1199 siginfo_t info;
1200
1201 info.si_signo = signal;
1202 info.si_errno = 0;
1203 info.si_code = code;
1204 info.si_addr = addr;
1205 force_sig_info(signal, &info, current);
1206 }
1207 #endif
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