[PATCH] m68k: convert generic irq code to irq controller
[linux-2.6.git] / arch / m68k / kernel / traps.c
1 /*
2  *  linux/arch/m68k/kernel/traps.c
3  *
4  *  Copyright (C) 1993, 1994 by Hamish Macdonald
5  *
6  *  68040 fixes by Michael Rausch
7  *  68040 fixes by Martin Apel
8  *  68040 fixes and writeback by Richard Zidlicky
9  *  68060 fixes by Roman Hodek
10  *  68060 fixes by Jesper Skov
11  *
12  * This file is subject to the terms and conditions of the GNU General Public
13  * License.  See the file COPYING in the main directory of this archive
14  * for more details.
15  */
16
17 /*
18  * Sets up all exception vectors
19  */
20
21 #include <linux/config.h>
22 #include <linux/sched.h>
23 #include <linux/signal.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/module.h>
27 #include <linux/a.out.h>
28 #include <linux/user.h>
29 #include <linux/string.h>
30 #include <linux/linkage.h>
31 #include <linux/init.h>
32 #include <linux/ptrace.h>
33 #include <linux/kallsyms.h>
34
35 #include <asm/setup.h>
36 #include <asm/fpu.h>
37 #include <asm/system.h>
38 #include <asm/uaccess.h>
39 #include <asm/traps.h>
40 #include <asm/pgalloc.h>
41 #include <asm/machdep.h>
42 #include <asm/siginfo.h>
43
44 /* assembler routines */
45 asmlinkage void system_call(void);
46 asmlinkage void buserr(void);
47 asmlinkage void trap(void);
48 asmlinkage void nmihandler(void);
49 #ifdef CONFIG_M68KFPU_EMU
50 asmlinkage void fpu_emu(void);
51 #endif
52
53 e_vector vectors[256] = {
54         [VEC_BUSERR]    = buserr,
55         [VEC_SYS]       = system_call,
56 };
57
58 /* nmi handler for the Amiga */
59 asm(".text\n"
60     __ALIGN_STR "\n"
61     "nmihandler: rte");
62
63 /*
64  * this must be called very early as the kernel might
65  * use some instruction that are emulated on the 060
66  */
67 void __init base_trap_init(void)
68 {
69         if(MACH_IS_SUN3X) {
70                 extern e_vector *sun3x_prom_vbr;
71
72                 __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
73         }
74
75         /* setup the exception vector table */
76         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
77
78         if (CPU_IS_060) {
79                 /* set up ISP entry points */
80                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
81
82                 vectors[VEC_UNIMPII] = unimp_vec;
83         }
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 *)wba);
331                 break;
332         case BA_SIZE_WORD:
333                 res = put_user(wbd & 0xffff, (short *)wba);
334                 break;
335         case BA_SIZE_LONG:
336                 res = put_user(wbd, (int *)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 an 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 #ifdef DEBUG
474                         printk(".. disabling wb2\n");
475 #endif
476                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
477                                 fp->un.fmt7.wb2s &= ~WBV_040;
478                 }
479         } else if (send_fault_sig(&fp->ptregs) > 0) {
480                 printk("68040 access error, ssw=%x\n", ssw);
481                 trap_c(fp);
482         }
483
484         do_040writebacks(fp);
485 }
486 #endif /* CONFIG_M68040 */
487
488 #if defined(CONFIG_SUN3)
489 #include <asm/sun3mmu.h>
490
491 extern int mmu_emu_handle_fault (unsigned long, int, int);
492
493 /* sun3 version of bus_error030 */
494
495 static inline void bus_error030 (struct frame *fp)
496 {
497         unsigned char buserr_type = sun3_get_buserr ();
498         unsigned long addr, errorcode;
499         unsigned short ssw = fp->un.fmtb.ssw;
500         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
501
502 #ifdef DEBUG
503         if (ssw & (FC | FB))
504                 printk ("Instruction fault at %#010lx\n",
505                         ssw & FC ?
506                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
507                         :
508                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
509         if (ssw & DF)
510                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
511                         ssw & RW ? "read" : "write",
512                         fp->un.fmtb.daddr,
513                         space_names[ssw & DFC], fp->ptregs.pc);
514 #endif
515
516         /*
517          * Check if this page should be demand-mapped. This needs to go before
518          * the testing for a bad kernel-space access (demand-mapping applies
519          * to kernel accesses too).
520          */
521
522         if ((ssw & DF)
523             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
524                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
525                         return;
526         }
527
528         /* Check for kernel-space pagefault (BAD). */
529         if (fp->ptregs.sr & PS_S) {
530                 /* kernel fault must be a data fault to user space */
531                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
532                      // try checking the kernel mappings before surrender
533                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
534                           return;
535                         /* instruction fault or kernel data fault! */
536                         if (ssw & (FC | FB))
537                                 printk ("Instruction fault at %#010lx\n",
538                                         fp->ptregs.pc);
539                         if (ssw & DF) {
540                                 /* was this fault incurred testing bus mappings? */
541                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
542                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
543                                         send_fault_sig(&fp->ptregs);
544                                         return;
545                                 }
546
547                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
548                                         ssw & RW ? "read" : "write",
549                                         fp->un.fmtb.daddr,
550                                         space_names[ssw & DFC], fp->ptregs.pc);
551                         }
552                         printk ("BAD KERNEL BUSERR\n");
553
554                         die_if_kernel("Oops", &fp->ptregs,0);
555                         force_sig(SIGKILL, current);
556                         return;
557                 }
558         } else {
559                 /* user fault */
560                 if (!(ssw & (FC | FB)) && !(ssw & DF))
561                         /* not an instruction fault or data fault! BAD */
562                         panic ("USER BUSERR w/o instruction or data fault");
563         }
564
565
566         /* First handle the data fault, if any.  */
567         if (ssw & DF) {
568                 addr = fp->un.fmtb.daddr;
569
570 // errorcode bit 0:     0 -> no page            1 -> protection fault
571 // errorcode bit 1:     0 -> read fault         1 -> write fault
572
573 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
574 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
575
576                 if (buserr_type & SUN3_BUSERR_PROTERR)
577                         errorcode = 0x01;
578                 else if (buserr_type & SUN3_BUSERR_INVALID)
579                         errorcode = 0x00;
580                 else {
581 #ifdef DEBUG
582                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
583                         printk ("invalid %s access at %#lx from pc %#lx\n",
584                                 !(ssw & RW) ? "write" : "read", addr,
585                                 fp->ptregs.pc);
586 #endif
587                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
588                         force_sig (SIGBUS, current);
589                         return;
590                 }
591
592 //todo: wtf is RM bit? --m
593                 if (!(ssw & RW) || ssw & RM)
594                         errorcode |= 0x02;
595
596                 /* Handle page fault. */
597                 do_page_fault (&fp->ptregs, addr, errorcode);
598
599                 /* Retry the data fault now. */
600                 return;
601         }
602
603         /* Now handle the instruction fault. */
604
605         /* Get the fault address. */
606         if (fp->ptregs.format == 0xA)
607                 addr = fp->ptregs.pc + 4;
608         else
609                 addr = fp->un.fmtb.baddr;
610         if (ssw & FC)
611                 addr -= 2;
612
613         if (buserr_type & SUN3_BUSERR_INVALID) {
614                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
615                         do_page_fault (&fp->ptregs, addr, 0);
616        } else {
617 #ifdef DEBUG
618                 printk ("protection fault on insn access (segv).\n");
619 #endif
620                 force_sig (SIGSEGV, current);
621        }
622 }
623 #else
624 #if defined(CPU_M68020_OR_M68030)
625 static inline void bus_error030 (struct frame *fp)
626 {
627         volatile unsigned short temp;
628         unsigned short mmusr;
629         unsigned long addr, errorcode;
630         unsigned short ssw = fp->un.fmtb.ssw;
631 #ifdef DEBUG
632         unsigned long desc;
633
634         printk ("pid = %x  ", current->pid);
635         printk ("SSW=%#06x  ", ssw);
636
637         if (ssw & (FC | FB))
638                 printk ("Instruction fault at %#010lx\n",
639                         ssw & FC ?
640                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
641                         :
642                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
643         if (ssw & DF)
644                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
645                         ssw & RW ? "read" : "write",
646                         fp->un.fmtb.daddr,
647                         space_names[ssw & DFC], fp->ptregs.pc);
648 #endif
649
650         /* ++andreas: If a data fault and an instruction fault happen
651            at the same time map in both pages.  */
652
653         /* First handle the data fault, if any.  */
654         if (ssw & DF) {
655                 addr = fp->un.fmtb.daddr;
656
657 #ifdef DEBUG
658                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
659                               "pmove %%psr,%1@"
660                               : "=a&" (desc)
661                               : "a" (&temp), "a" (addr), "d" (ssw));
662 #else
663                 asm volatile ("ptestr %2,%1@,#7\n\t"
664                               "pmove %%psr,%0@"
665                               : : "a" (&temp), "a" (addr), "d" (ssw));
666 #endif
667                 mmusr = temp;
668
669 #ifdef DEBUG
670                 printk("mmusr is %#x for addr %#lx in task %p\n",
671                        mmusr, addr, current);
672                 printk("descriptor address is %#lx, contents %#lx\n",
673                        __va(desc), *(unsigned long *)__va(desc));
674 #endif
675
676                 errorcode = (mmusr & MMU_I) ? 0 : 1;
677                 if (!(ssw & RW) || (ssw & RM))
678                         errorcode |= 2;
679
680                 if (mmusr & (MMU_I | MMU_WP)) {
681                         if (ssw & 4) {
682                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
683                                        ssw & RW ? "read" : "write",
684                                        fp->un.fmtb.daddr,
685                                        space_names[ssw & DFC], fp->ptregs.pc);
686                                 goto buserr;
687                         }
688                         /* Don't try to do anything further if an exception was
689                            handled. */
690                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
691                                 return;
692                 } else if (!(mmusr & MMU_I)) {
693                         /* probably a 020 cas fault */
694                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
695                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
696                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
697                         printk("invalid %s access at %#lx from pc %#lx\n",
698                                !(ssw & RW) ? "write" : "read", addr,
699                                fp->ptregs.pc);
700                         die_if_kernel("Oops",&fp->ptregs,mmusr);
701                         force_sig(SIGSEGV, current);
702                         return;
703                 } else {
704 #if 0
705                         static volatile long tlong;
706 #endif
707
708                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
709                                !(ssw & RW) ? "write" : "read", addr,
710                                fp->ptregs.pc, ssw);
711                         asm volatile ("ptestr #1,%1@,#0\n\t"
712                                       "pmove %%psr,%0@"
713                                       : /* no outputs */
714                                       : "a" (&temp), "a" (addr));
715                         mmusr = temp;
716
717                         printk ("level 0 mmusr is %#x\n", mmusr);
718 #if 0
719                         asm volatile ("pmove %%tt0,%0@"
720                                       : /* no outputs */
721                                       : "a" (&tlong));
722                         printk("tt0 is %#lx, ", tlong);
723                         asm volatile ("pmove %%tt1,%0@"
724                                       : /* no outputs */
725                                       : "a" (&tlong));
726                         printk("tt1 is %#lx\n", tlong);
727 #endif
728 #ifdef DEBUG
729                         printk("Unknown SIGSEGV - 1\n");
730 #endif
731                         die_if_kernel("Oops",&fp->ptregs,mmusr);
732                         force_sig(SIGSEGV, current);
733                         return;
734                 }
735
736                 /* setup an ATC entry for the access about to be retried */
737                 if (!(ssw & RW) || (ssw & RM))
738                         asm volatile ("ploadw %1,%0@" : /* no outputs */
739                                       : "a" (addr), "d" (ssw));
740                 else
741                         asm volatile ("ploadr %1,%0@" : /* no outputs */
742                                       : "a" (addr), "d" (ssw));
743         }
744
745         /* Now handle the instruction fault. */
746
747         if (!(ssw & (FC|FB)))
748                 return;
749
750         if (fp->ptregs.sr & PS_S) {
751                 printk("Instruction fault at %#010lx\n",
752                         fp->ptregs.pc);
753         buserr:
754                 printk ("BAD KERNEL BUSERR\n");
755                 die_if_kernel("Oops",&fp->ptregs,0);
756                 force_sig(SIGKILL, current);
757                 return;
758         }
759
760         /* get the fault address */
761         if (fp->ptregs.format == 10)
762                 addr = fp->ptregs.pc + 4;
763         else
764                 addr = fp->un.fmtb.baddr;
765         if (ssw & FC)
766                 addr -= 2;
767
768         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
769                 /* Insn fault on same page as data fault.  But we
770                    should still create the ATC entry.  */
771                 goto create_atc_entry;
772
773 #ifdef DEBUG
774         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
775                       "pmove %%psr,%1@"
776                       : "=a&" (desc)
777                       : "a" (&temp), "a" (addr));
778 #else
779         asm volatile ("ptestr #1,%1@,#7\n\t"
780                       "pmove %%psr,%0@"
781                       : : "a" (&temp), "a" (addr));
782 #endif
783         mmusr = temp;
784
785 #ifdef DEBUG
786         printk ("mmusr is %#x for addr %#lx in task %p\n",
787                 mmusr, addr, current);
788         printk ("descriptor address is %#lx, contents %#lx\n",
789                 __va(desc), *(unsigned long *)__va(desc));
790 #endif
791
792         if (mmusr & MMU_I)
793                 do_page_fault (&fp->ptregs, addr, 0);
794         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
795                 printk ("invalid insn access at %#lx from pc %#lx\n",
796                         addr, fp->ptregs.pc);
797 #ifdef DEBUG
798                 printk("Unknown SIGSEGV - 2\n");
799 #endif
800                 die_if_kernel("Oops",&fp->ptregs,mmusr);
801                 force_sig(SIGSEGV, current);
802                 return;
803         }
804
805 create_atc_entry:
806         /* setup an ATC entry for the access about to be retried */
807         asm volatile ("ploadr #2,%0@" : /* no outputs */
808                       : "a" (addr));
809 }
810 #endif /* CPU_M68020_OR_M68030 */
811 #endif /* !CONFIG_SUN3 */
812
813 asmlinkage void buserr_c(struct frame *fp)
814 {
815         /* Only set esp0 if coming from user mode */
816         if (user_mode(&fp->ptregs))
817                 current->thread.esp0 = (unsigned long) fp;
818
819 #ifdef DEBUG
820         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
821 #endif
822
823         switch (fp->ptregs.format) {
824 #if defined (CONFIG_M68060)
825         case 4:                         /* 68060 access error */
826           access_error060 (fp);
827           break;
828 #endif
829 #if defined (CONFIG_M68040)
830         case 0x7:                       /* 68040 access error */
831           access_error040 (fp);
832           break;
833 #endif
834 #if defined (CPU_M68020_OR_M68030)
835         case 0xa:
836         case 0xb:
837           bus_error030 (fp);
838           break;
839 #endif
840         default:
841           die_if_kernel("bad frame format",&fp->ptregs,0);
842 #ifdef DEBUG
843           printk("Unknown SIGSEGV - 4\n");
844 #endif
845           force_sig(SIGSEGV, current);
846         }
847 }
848
849
850 static int kstack_depth_to_print = 48;
851
852 void show_trace(unsigned long *stack)
853 {
854         unsigned long *endstack;
855         unsigned long addr;
856         int i;
857
858         printk("Call Trace:");
859         addr = (unsigned long)stack + THREAD_SIZE - 1;
860         endstack = (unsigned long *)(addr & -THREAD_SIZE);
861         i = 0;
862         while (stack + 1 <= endstack) {
863                 addr = *stack++;
864                 /*
865                  * If the address is either in the text segment of the
866                  * kernel, or in the region which contains vmalloc'ed
867                  * memory, it *may* be the address of a calling
868                  * routine; if so, print it so that someone tracing
869                  * down the cause of the crash will be able to figure
870                  * out the call path that was taken.
871                  */
872                 if (__kernel_text_address(addr)) {
873 #ifndef CONFIG_KALLSYMS
874                         if (i % 5 == 0)
875                                 printk("\n       ");
876 #endif
877                         printk(" [<%08lx>]", addr);
878                         print_symbol(" %s\n", addr);
879                         i++;
880                 }
881         }
882         printk("\n");
883 }
884
885 void show_registers(struct pt_regs *regs)
886 {
887         struct frame *fp = (struct frame *)regs;
888         mm_segment_t old_fs = get_fs();
889         u16 c, *cp;
890         unsigned long addr;
891         int i;
892
893         print_modules();
894         printk("PC: [<%08lx>]",regs->pc);
895         print_symbol(" %s", regs->pc);
896         printk("\nSR: %04x  SP: %p  a2: %08lx\n",
897                regs->sr, regs, regs->a2);
898         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
899                regs->d0, regs->d1, regs->d2, regs->d3);
900         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
901                regs->d4, regs->d5, regs->a0, regs->a1);
902
903         printk("Process %s (pid: %d, task=%p)\n",
904                 current->comm, current->pid, current);
905         addr = (unsigned long)&fp->un;
906         printk("Frame format=%X ", regs->format);
907         switch (regs->format) {
908         case 0x2:
909                 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
910                 addr += sizeof(fp->un.fmt2);
911                 break;
912         case 0x3:
913                 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
914                 addr += sizeof(fp->un.fmt3);
915                 break;
916         case 0x4:
917                 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
918                         : "eff addr=%08lx pc=%08lx\n"),
919                         fp->un.fmt4.effaddr, fp->un.fmt4.pc);
920                 addr += sizeof(fp->un.fmt4);
921                 break;
922         case 0x7:
923                 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
924                         fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
925                 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
926                         fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
927                 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
928                         fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
929                 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
930                         fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
931                 printk("push data: %08lx %08lx %08lx %08lx\n",
932                         fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
933                         fp->un.fmt7.pd3);
934                 addr += sizeof(fp->un.fmt7);
935                 break;
936         case 0x9:
937                 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
938                 addr += sizeof(fp->un.fmt9);
939                 break;
940         case 0xa:
941                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
942                         fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
943                         fp->un.fmta.daddr, fp->un.fmta.dobuf);
944                 addr += sizeof(fp->un.fmta);
945                 break;
946         case 0xb:
947                 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
948                         fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
949                         fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
950                 printk("baddr=%08lx dibuf=%08lx ver=%x\n",
951                         fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
952                 addr += sizeof(fp->un.fmtb);
953                 break;
954         default:
955                 printk("\n");
956         }
957         show_stack(NULL, (unsigned long *)addr);
958
959         printk("Code:");
960         set_fs(KERNEL_DS);
961         cp = (u16 *)regs->pc;
962         for (i = -8; i < 16; i++) {
963                 if (get_user(c, cp + i) && i >= 0) {
964                         printk(" Bad PC value.");
965                         break;
966                 }
967                 printk(i ? " %04x" : " <%04x>", c);
968         }
969         set_fs(old_fs);
970         printk ("\n");
971 }
972
973 void show_stack(struct task_struct *task, unsigned long *stack)
974 {
975         unsigned long *p;
976         unsigned long *endstack;
977         int i;
978
979         if (!stack) {
980                 if (task)
981                         stack = (unsigned long *)task->thread.esp0;
982                 else
983                         stack = (unsigned long *)&stack;
984         }
985         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
986
987         printk("Stack from %08lx:", (unsigned long)stack);
988         p = stack;
989         for (i = 0; i < kstack_depth_to_print; i++) {
990                 if (p + 1 > endstack)
991                         break;
992                 if (i % 8 == 0)
993                         printk("\n       ");
994                 printk(" %08lx", *p++);
995         }
996         printk("\n");
997         show_trace(stack);
998 }
999
1000 /*
1001  * The architecture-independent backtrace generator
1002  */
1003 void dump_stack(void)
1004 {
1005         unsigned long stack;
1006
1007         show_trace(&stack);
1008 }
1009
1010 EXPORT_SYMBOL(dump_stack);
1011
1012 void bad_super_trap (struct frame *fp)
1013 {
1014         console_verbose();
1015         if (fp->ptregs.vector < 4*sizeof(vec_names)/sizeof(vec_names[0]))
1016                 printk ("*** %s ***   FORMAT=%X\n",
1017                         vec_names[(fp->ptregs.vector) >> 2],
1018                         fp->ptregs.format);
1019         else
1020                 printk ("*** Exception %d ***   FORMAT=%X\n",
1021                         (fp->ptregs.vector) >> 2,
1022                         fp->ptregs.format);
1023         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1024                 unsigned short ssw = fp->un.fmtb.ssw;
1025
1026                 printk ("SSW=%#06x  ", ssw);
1027
1028                 if (ssw & RC)
1029                         printk ("Pipe stage C instruction fault at %#010lx\n",
1030                                 (fp->ptregs.format) == 0xA ?
1031                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1032                 if (ssw & RB)
1033                         printk ("Pipe stage B instruction fault at %#010lx\n",
1034                                 (fp->ptregs.format) == 0xA ?
1035                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1036                 if (ssw & DF)
1037                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1038                                 ssw & RW ? "read" : "write",
1039                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1040                                 fp->ptregs.pc);
1041         }
1042         printk ("Current process id is %d\n", current->pid);
1043         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1044 }
1045
1046 asmlinkage void trap_c(struct frame *fp)
1047 {
1048         int sig;
1049         siginfo_t info;
1050
1051         if (fp->ptregs.sr & PS_S) {
1052                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1053                         /* traced a trapping instruction */
1054                         current->ptrace |= PT_DTRACE;
1055                 } else
1056                         bad_super_trap(fp);
1057                 return;
1058         }
1059
1060         /* send the appropriate signal to the user program */
1061         switch ((fp->ptregs.vector) >> 2) {
1062             case VEC_ADDRERR:
1063                 info.si_code = BUS_ADRALN;
1064                 sig = SIGBUS;
1065                 break;
1066             case VEC_ILLEGAL:
1067             case VEC_LINE10:
1068             case VEC_LINE11:
1069                 info.si_code = ILL_ILLOPC;
1070                 sig = SIGILL;
1071                 break;
1072             case VEC_PRIV:
1073                 info.si_code = ILL_PRVOPC;
1074                 sig = SIGILL;
1075                 break;
1076             case VEC_COPROC:
1077                 info.si_code = ILL_COPROC;
1078                 sig = SIGILL;
1079                 break;
1080             case VEC_TRAP1:
1081             case VEC_TRAP2:
1082             case VEC_TRAP3:
1083             case VEC_TRAP4:
1084             case VEC_TRAP5:
1085             case VEC_TRAP6:
1086             case VEC_TRAP7:
1087             case VEC_TRAP8:
1088             case VEC_TRAP9:
1089             case VEC_TRAP10:
1090             case VEC_TRAP11:
1091             case VEC_TRAP12:
1092             case VEC_TRAP13:
1093             case VEC_TRAP14:
1094                 info.si_code = ILL_ILLTRP;
1095                 sig = SIGILL;
1096                 break;
1097             case VEC_FPBRUC:
1098             case VEC_FPOE:
1099             case VEC_FPNAN:
1100                 info.si_code = FPE_FLTINV;
1101                 sig = SIGFPE;
1102                 break;
1103             case VEC_FPIR:
1104                 info.si_code = FPE_FLTRES;
1105                 sig = SIGFPE;
1106                 break;
1107             case VEC_FPDIVZ:
1108                 info.si_code = FPE_FLTDIV;
1109                 sig = SIGFPE;
1110                 break;
1111             case VEC_FPUNDER:
1112                 info.si_code = FPE_FLTUND;
1113                 sig = SIGFPE;
1114                 break;
1115             case VEC_FPOVER:
1116                 info.si_code = FPE_FLTOVF;
1117                 sig = SIGFPE;
1118                 break;
1119             case VEC_ZERODIV:
1120                 info.si_code = FPE_INTDIV;
1121                 sig = SIGFPE;
1122                 break;
1123             case VEC_CHK:
1124             case VEC_TRAP:
1125                 info.si_code = FPE_INTOVF;
1126                 sig = SIGFPE;
1127                 break;
1128             case VEC_TRACE:             /* ptrace single step */
1129                 info.si_code = TRAP_TRACE;
1130                 sig = SIGTRAP;
1131                 break;
1132             case VEC_TRAP15:            /* breakpoint */
1133                 info.si_code = TRAP_BRKPT;
1134                 sig = SIGTRAP;
1135                 break;
1136             default:
1137                 info.si_code = ILL_ILLOPC;
1138                 sig = SIGILL;
1139                 break;
1140         }
1141         info.si_signo = sig;
1142         info.si_errno = 0;
1143         switch (fp->ptregs.format) {
1144             default:
1145                 info.si_addr = (void *) fp->ptregs.pc;
1146                 break;
1147             case 2:
1148                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1149                 break;
1150             case 7:
1151                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1152                 break;
1153             case 9:
1154                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1155                 break;
1156             case 10:
1157                 info.si_addr = (void *) fp->un.fmta.daddr;
1158                 break;
1159             case 11:
1160                 info.si_addr = (void *) fp->un.fmtb.daddr;
1161                 break;
1162         }
1163         force_sig_info (sig, &info, current);
1164 }
1165
1166 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1167 {
1168         if (!(fp->sr & PS_S))
1169                 return;
1170
1171         console_verbose();
1172         printk("%s: %08x\n",str,nr);
1173         show_registers(fp);
1174         do_exit(SIGSEGV);
1175 }
1176
1177 /*
1178  * This function is called if an error occur while accessing
1179  * user-space from the fpsp040 code.
1180  */
1181 asmlinkage void fpsp040_die(void)
1182 {
1183         do_exit(SIGSEGV);
1184 }
1185
1186 #ifdef CONFIG_M68KFPU_EMU
1187 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1188 {
1189         siginfo_t info;
1190
1191         info.si_signo = signal;
1192         info.si_errno = 0;
1193         info.si_code = code;
1194         info.si_addr = addr;
1195         force_sig_info(signal, &info, current);
1196 }
1197 #endif