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144077ea GU |
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> | |
144077ea GU |
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", | |
1da177e4 | 115 | #else |
144077ea GU |
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 | ||
245b815c | 136 | pr_debug("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr); |
144077ea GU |
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; | |
245b815c | 163 | pr_debug("errorcode = %ld\n", errorcode); |
144077ea GU |
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) { | |
245b815c GU |
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); | |
144077ea GU |
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 | ||
245b815c | 225 | pr_debug("do_040writeback1, res=%d\n", res); |
144077ea GU |
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) | |
245b815c | 247 | pr_err("access_error040: cannot handle 1st writeback. oops.\n"); |
144077ea GU |
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 | ||
245b815c GU |
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, | |
144077ea | 302 | fp->un.fmt7.wb2s, fp->un.fmt7.wb3s); |
245b815c | 303 | pr_debug("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n", |
144077ea GU |
304 | fp->un.fmt7.wb2a, fp->un.fmt7.wb3a, |
305 | fp->un.fmt7.wb2d, fp->un.fmt7.wb3d); | |
144077ea GU |
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); | |
245b815c | 320 | pr_debug("mmusr = %lx\n", mmusr); |
144077ea GU |
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)) { | |
245b815c | 334 | pr_debug("do_page_fault() !=0\n"); |
144077ea GU |
335 | if (user_mode(&fp->ptregs)){ |
336 | /* delay writebacks after signal delivery */ | |
245b815c | 337 | pr_debug(".. was usermode - return\n"); |
144077ea GU |
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: | |
245b815c | 345 | pr_debug(".. disabling wb2\n"); |
144077ea GU |
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) | |
245b815c | 359 | pr_err("68040 bus error (ssw=%x, faddr=%lx)\n", ssw, |
144077ea GU |
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 | ||
144077ea | 382 | if (ssw & (FC | FB)) |
245b815c | 383 | pr_debug("Instruction fault at %#010lx\n", |
144077ea GU |
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) | |
245b815c | 389 | pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n", |
144077ea GU |
390 | ssw & RW ? "read" : "write", |
391 | fp->un.fmtb.daddr, | |
392 | space_names[ssw & DFC], fp->ptregs.pc); | |
144077ea GU |
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)) | |
245b815c | 415 | pr_err("Instruction fault at %#010lx\n", |
144077ea GU |
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 | ||
245b815c | 425 | pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n", |
144077ea GU |
426 | ssw & RW ? "read" : "write", |
427 | fp->un.fmtb.daddr, | |
428 | space_names[ssw & DFC], fp->ptregs.pc); | |
429 | } | |
245b815c | 430 | pr_err("BAD KERNEL BUSERR\n"); |
144077ea GU |
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 { | |
245b815c GU |
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); | |
144077ea GU |
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) { | |
5fec45a2 | 491 | if (!mmu_emu_handle_fault(addr, 1, 0)) |
144077ea GU |
492 | do_page_fault (&fp->ptregs, addr, 0); |
493 | } else { | |
245b815c | 494 | pr_debug("protection fault on insn access (segv).\n"); |
144077ea GU |
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; | |
245b815c | 508 | #endif |
144077ea | 509 | |
245b815c GU |
510 | pr_debug("pid = %x ", current->pid); |
511 | pr_debug("SSW=%#06x ", ssw); | |
144077ea GU |
512 | |
513 | if (ssw & (FC | FB)) | |
245b815c | 514 | pr_debug("Instruction fault at %#010lx\n", |
144077ea GU |
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) | |
245b815c | 520 | pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n", |
144077ea GU |
521 | ssw & RW ? "read" : "write", |
522 | fp->un.fmtb.daddr, | |
523 | space_names[ssw & DFC], fp->ptregs.pc); | |
144077ea GU |
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" | |
2a353506 AS |
534 | "pmove %%psr,%1" |
535 | : "=a&" (desc), "=m" (temp) | |
536 | : "a" (addr), "d" (ssw)); | |
245b815c GU |
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)); | |
144077ea GU |
541 | #else |
542 | asm volatile ("ptestr %2,%1@,#7\n\t" | |
2a353506 AS |
543 | "pmove %%psr,%0" |
544 | : "=m" (temp) : "a" (addr), "d" (ssw)); | |
144077ea GU |
545 | #endif |
546 | mmusr = temp; | |
144077ea GU |
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) { | |
245b815c | 553 | pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n", |
144077ea GU |
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) | |
245b815c GU |
566 | pr_err("unexpected bus error (%#x,%#x)\n", ssw, |
567 | mmusr); | |
144077ea | 568 | } else if (mmusr & (MMU_B|MMU_L|MMU_S)) { |
245b815c | 569 | pr_err("invalid %s access at %#lx from pc %#lx\n", |
144077ea GU |
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 | ||
245b815c | 580 | pr_err("weird %s access at %#lx from pc %#lx (ssw is %#x)\n", |
144077ea GU |
581 | !(ssw & RW) ? "write" : "read", addr, |
582 | fp->ptregs.pc, ssw); | |
583 | asm volatile ("ptestr #1,%1@,#0\n\t" | |
2a353506 AS |
584 | "pmove %%psr,%0" |
585 | : "=m" (temp) | |
586 | : "a" (addr)); | |
144077ea GU |
587 | mmusr = temp; |
588 | ||
245b815c | 589 | pr_err("level 0 mmusr is %#x\n", mmusr); |
144077ea | 590 | #if 0 |
2a353506 AS |
591 | asm volatile ("pmove %%tt0,%0" |
592 | : "=m" (tlong)); | |
245b815c | 593 | pr_debug("tt0 is %#lx, ", tlong); |
2a353506 AS |
594 | asm volatile ("pmove %%tt1,%0" |
595 | : "=m" (tlong)); | |
245b815c | 596 | pr_debug("tt1 is %#lx\n", tlong); |
144077ea | 597 | #endif |
245b815c | 598 | pr_debug("Unknown SIGSEGV - 1\n"); |
144077ea GU |
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) { | |
245b815c | 619 | pr_err("Instruction fault at %#010lx\n", fp->ptregs.pc); |
144077ea | 620 | buserr: |
245b815c | 621 | pr_err("BAD KERNEL BUSERR\n"); |
144077ea GU |
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" | |
2a353506 AS |
642 | "pmove %%psr,%1" |
643 | : "=a&" (desc), "=m" (temp) | |
644 | : "a" (addr)); | |
245b815c GU |
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)); | |
144077ea GU |
649 | #else |
650 | asm volatile ("ptestr #1,%1@,#7\n\t" | |
2a353506 AS |
651 | "pmove %%psr,%0" |
652 | : "=m" (temp) : "a" (addr)); | |
144077ea GU |
653 | #endif |
654 | mmusr = temp; | |
144077ea GU |
655 | if (mmusr & MMU_I) |
656 | do_page_fault (&fp->ptregs, addr, 0); | |
657 | else if (mmusr & (MMU_B|MMU_L|MMU_S)) { | |
245b815c | 658 | pr_err("invalid insn access at %#lx from pc %#lx\n", |
144077ea | 659 | addr, fp->ptregs.pc); |
245b815c | 660 | pr_debug("Unknown SIGSEGV - 2\n"); |
144077ea GU |
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 | ||
78d705e3 GU |
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 | ||
144077ea GU |
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 | ||
245b815c | 762 | pr_debug("*** Bus Error *** Format is %x\n", fp->ptregs.format); |
144077ea | 763 | |
78d705e3 GU |
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 | ||
144077ea GU |
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); | |
245b815c | 805 | pr_debug("Unknown SIGSEGV - 4\n"); |
144077ea GU |
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 | ||
245b815c | 819 | pr_info("Call Trace:"); |
144077ea GU |
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) | |
245b815c | 836 | pr_cont("\n "); |
144077ea | 837 | #endif |
245b815c | 838 | pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr); |
144077ea GU |
839 | i++; |
840 | } | |
841 | } | |
245b815c | 842 | pr_cont("\n"); |
144077ea GU |
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(); | |
245b815c GU |
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", | |
144077ea | 857 | regs->d0, regs->d1, regs->d2, regs->d3); |
245b815c | 858 | pr_info("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n", |
144077ea GU |
859 | regs->d4, regs->d5, regs->a0, regs->a1); |
860 | ||
245b815c | 861 | pr_info("Process %s (pid: %d, task=%p)\n", |
144077ea GU |
862 | current->comm, task_pid_nr(current), current); |
863 | addr = (unsigned long)&fp->un; | |
245b815c | 864 | pr_info("Frame format=%X ", regs->format); |
144077ea GU |
865 | switch (regs->format) { |
866 | case 0x2: | |
245b815c | 867 | pr_cont("instr addr=%08lx\n", fp->un.fmt2.iaddr); |
144077ea GU |
868 | addr += sizeof(fp->un.fmt2); |
869 | break; | |
870 | case 0x3: | |
245b815c | 871 | pr_cont("eff addr=%08lx\n", fp->un.fmt3.effaddr); |
144077ea GU |
872 | addr += sizeof(fp->un.fmt3); |
873 | break; | |
874 | case 0x4: | |
245b815c GU |
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); | |
144077ea GU |
881 | addr += sizeof(fp->un.fmt4); |
882 | break; | |
883 | case 0x7: | |
245b815c | 884 | pr_cont("eff addr=%08lx ssw=%04x faddr=%08lx\n", |
144077ea | 885 | fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr); |
245b815c | 886 | pr_info("wb 1 stat/addr/data: %04x %08lx %08lx\n", |
144077ea | 887 | fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0); |
245b815c | 888 | pr_info("wb 2 stat/addr/data: %04x %08lx %08lx\n", |
144077ea | 889 | fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d); |
245b815c | 890 | pr_info("wb 3 stat/addr/data: %04x %08lx %08lx\n", |
144077ea | 891 | fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d); |
245b815c | 892 | pr_info("push data: %08lx %08lx %08lx %08lx\n", |
144077ea GU |
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: | |
245b815c | 898 | pr_cont("instr addr=%08lx\n", fp->un.fmt9.iaddr); |
144077ea GU |
899 | addr += sizeof(fp->un.fmt9); |
900 | break; | |
901 | case 0xa: | |
245b815c | 902 | pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n", |
144077ea GU |
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: | |
245b815c | 908 | pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n", |
144077ea GU |
909 | fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb, |
910 | fp->un.fmtb.daddr, fp->un.fmtb.dobuf); | |
245b815c | 911 | pr_info("baddr=%08lx dibuf=%08lx ver=%x\n", |
144077ea GU |
912 | fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver); |
913 | addr += sizeof(fp->un.fmtb); | |
914 | break; | |
915 | default: | |
245b815c | 916 | pr_cont("\n"); |
144077ea GU |
917 | } |
918 | show_stack(NULL, (unsigned long *)addr); | |
919 | ||
245b815c | 920 | pr_info("Code:"); |
144077ea GU |
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) { | |
245b815c | 925 | pr_cont(" Bad PC value."); |
144077ea GU |
926 | break; |
927 | } | |
245b815c GU |
928 | if (i) |
929 | pr_cont(" %04x", c); | |
930 | else | |
931 | pr_cont(" <%04x>", c); | |
144077ea GU |
932 | } |
933 | set_fs(old_fs); | |
245b815c | 934 | pr_cont("\n"); |
144077ea GU |
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 | ||
245b815c | 951 | pr_info("Stack from %08lx:", (unsigned long)stack); |
144077ea GU |
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) | |
245b815c GU |
957 | pr_cont("\n "); |
958 | pr_cont(" %08lx", *p++); | |
144077ea | 959 | } |
245b815c | 960 | pr_cont("\n"); |
144077ea GU |
961 | show_trace(stack); |
962 | } | |
963 | ||
144077ea GU |
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)) | |
245b815c | 978 | pr_err("*** %s *** FORMAT=%X\n", |
144077ea GU |
979 | vec_names[vector], |
980 | fp->ptregs.format); | |
981 | else | |
245b815c | 982 | pr_err("*** Exception %d *** FORMAT=%X\n", |
144077ea GU |
983 | vector, fp->ptregs.format); |
984 | if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) { | |
985 | unsigned short ssw = fp->un.fmtb.ssw; | |
986 | ||
245b815c | 987 | pr_err("SSW=%#06x ", ssw); |
144077ea GU |
988 | |
989 | if (ssw & RC) | |
245b815c | 990 | pr_err("Pipe stage C instruction fault at %#010lx\n", |
144077ea GU |
991 | (fp->ptregs.format) == 0xA ? |
992 | fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2); | |
993 | if (ssw & RB) | |
245b815c | 994 | pr_err("Pipe stage B instruction fault at %#010lx\n", |
144077ea GU |
995 | (fp->ptregs.format) == 0xA ? |
996 | fp->ptregs.pc + 4 : fp->un.fmtb.baddr); | |
997 | if (ssw & DF) | |
245b815c | 998 | pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n", |
144077ea GU |
999 | ssw & RW ? "read" : "write", |
1000 | fp->un.fmtb.daddr, space_names[ssw & DFC], | |
1001 | fp->ptregs.pc); | |
1002 | } | |
245b815c | 1003 | pr_err("Current process id is %d\n", task_pid_nr(current)); |
144077ea GU |
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(); | |
245b815c | 1135 | pr_crit("%s: %08x\n", str, nr); |
144077ea | 1136 | show_registers(fp); |
373d4d09 | 1137 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
144077ea GU |
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 | } | |
1da177e4 | 1166 | #endif |