Merge branch 'upstream'
[linux-2.6] / 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 inthandler(void);
49 asmlinkage void nmihandler(void);
50 #ifdef CONFIG_M68KFPU_EMU
51 asmlinkage void fpu_emu(void);
52 #endif
53
54 e_vector vectors[256] = {
55         [VEC_BUSERR]    = buserr,
56         [VEC_ADDRERR]   = trap,
57         [VEC_ILLEGAL]   = trap,
58         [VEC_ZERODIV]   = trap,
59         [VEC_CHK]       = trap,
60         [VEC_TRAP]      = trap,
61         [VEC_PRIV]      = trap,
62         [VEC_TRACE]     = trap,
63         [VEC_LINE10]    = trap,
64         [VEC_LINE11]    = trap,
65         [VEC_RESV12]    = trap,
66         [VEC_COPROC]    = trap,
67         [VEC_FORMAT]    = trap,
68         [VEC_UNINT]     = trap,
69         [VEC_RESV16]    = trap,
70         [VEC_RESV17]    = trap,
71         [VEC_RESV18]    = trap,
72         [VEC_RESV19]    = trap,
73         [VEC_RESV20]    = trap,
74         [VEC_RESV21]    = trap,
75         [VEC_RESV22]    = trap,
76         [VEC_RESV23]    = trap,
77         [VEC_SPUR]      = inthandler,
78         [VEC_INT1]      = inthandler,
79         [VEC_INT2]      = inthandler,
80         [VEC_INT3]      = inthandler,
81         [VEC_INT4]      = inthandler,
82         [VEC_INT5]      = inthandler,
83         [VEC_INT6]      = inthandler,
84         [VEC_INT7]      = inthandler,
85         [VEC_SYS]       = system_call,
86         [VEC_TRAP1]     = trap,
87         [VEC_TRAP2]     = trap,
88         [VEC_TRAP3]     = trap,
89         [VEC_TRAP4]     = trap,
90         [VEC_TRAP5]     = trap,
91         [VEC_TRAP6]     = trap,
92         [VEC_TRAP7]     = trap,
93         [VEC_TRAP8]     = trap,
94         [VEC_TRAP9]     = trap,
95         [VEC_TRAP10]    = trap,
96         [VEC_TRAP11]    = trap,
97         [VEC_TRAP12]    = trap,
98         [VEC_TRAP13]    = trap,
99         [VEC_TRAP14]    = trap,
100         [VEC_TRAP15]    = trap,
101 };
102
103 /* nmi handler for the Amiga */
104 asm(".text\n"
105     __ALIGN_STR "\n"
106     "nmihandler: rte");
107
108 /*
109  * this must be called very early as the kernel might
110  * use some instruction that are emulated on the 060
111  */
112 void __init base_trap_init(void)
113 {
114         if(MACH_IS_SUN3X) {
115                 extern e_vector *sun3x_prom_vbr;
116
117                 __asm__ volatile ("movec %%vbr, %0" : "=r" ((void*)sun3x_prom_vbr));
118         }
119
120         /* setup the exception vector table */
121         __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
122
123         if (CPU_IS_060) {
124                 /* set up ISP entry points */
125                 asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
126
127                 vectors[VEC_UNIMPII] = unimp_vec;
128         }
129 }
130
131 void __init trap_init (void)
132 {
133         int i;
134
135         for (i = 48; i < 64; i++)
136                 if (!vectors[i])
137                         vectors[i] = trap;
138
139         for (i = 64; i < 256; i++)
140                 vectors[i] = inthandler;
141
142 #ifdef CONFIG_M68KFPU_EMU
143         if (FPU_IS_EMU)
144                 vectors[VEC_LINE11] = fpu_emu;
145 #endif
146
147         if (CPU_IS_040 && !FPU_IS_EMU) {
148                 /* set up FPSP entry points */
149                 asmlinkage void dz_vec(void) asm ("dz");
150                 asmlinkage void inex_vec(void) asm ("inex");
151                 asmlinkage void ovfl_vec(void) asm ("ovfl");
152                 asmlinkage void unfl_vec(void) asm ("unfl");
153                 asmlinkage void snan_vec(void) asm ("snan");
154                 asmlinkage void operr_vec(void) asm ("operr");
155                 asmlinkage void bsun_vec(void) asm ("bsun");
156                 asmlinkage void fline_vec(void) asm ("fline");
157                 asmlinkage void unsupp_vec(void) asm ("unsupp");
158
159                 vectors[VEC_FPDIVZ] = dz_vec;
160                 vectors[VEC_FPIR] = inex_vec;
161                 vectors[VEC_FPOVER] = ovfl_vec;
162                 vectors[VEC_FPUNDER] = unfl_vec;
163                 vectors[VEC_FPNAN] = snan_vec;
164                 vectors[VEC_FPOE] = operr_vec;
165                 vectors[VEC_FPBRUC] = bsun_vec;
166                 vectors[VEC_LINE11] = fline_vec;
167                 vectors[VEC_FPUNSUP] = unsupp_vec;
168         }
169
170         if (CPU_IS_060 && !FPU_IS_EMU) {
171                 /* set up IFPSP entry points */
172                 asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
173                 asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
174                 asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
175                 asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
176                 asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
177                 asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
178                 asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
179                 asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
180                 asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
181
182                 vectors[VEC_FPNAN] = snan_vec6;
183                 vectors[VEC_FPOE] = operr_vec6;
184                 vectors[VEC_FPOVER] = ovfl_vec6;
185                 vectors[VEC_FPUNDER] = unfl_vec6;
186                 vectors[VEC_FPDIVZ] = dz_vec6;
187                 vectors[VEC_FPIR] = inex_vec6;
188                 vectors[VEC_LINE11] = fline_vec6;
189                 vectors[VEC_FPUNSUP] = unsupp_vec6;
190                 vectors[VEC_UNIMPEA] = effadd_vec6;
191         }
192
193         /* if running on an amiga, make the NMI interrupt do nothing */
194         if (MACH_IS_AMIGA) {
195                 vectors[VEC_INT7] = nmihandler;
196         }
197 }
198
199
200 static const char *vec_names[] = {
201         [VEC_RESETSP]   = "RESET SP",
202         [VEC_RESETPC]   = "RESET PC",
203         [VEC_BUSERR]    = "BUS ERROR",
204         [VEC_ADDRERR]   = "ADDRESS ERROR",
205         [VEC_ILLEGAL]   = "ILLEGAL INSTRUCTION",
206         [VEC_ZERODIV]   = "ZERO DIVIDE",
207         [VEC_CHK]       = "CHK",
208         [VEC_TRAP]      = "TRAPcc",
209         [VEC_PRIV]      = "PRIVILEGE VIOLATION",
210         [VEC_TRACE]     = "TRACE",
211         [VEC_LINE10]    = "LINE 1010",
212         [VEC_LINE11]    = "LINE 1111",
213         [VEC_RESV12]    = "UNASSIGNED RESERVED 12",
214         [VEC_COPROC]    = "COPROCESSOR PROTOCOL VIOLATION",
215         [VEC_FORMAT]    = "FORMAT ERROR",
216         [VEC_UNINT]     = "UNINITIALIZED INTERRUPT",
217         [VEC_RESV16]    = "UNASSIGNED RESERVED 16",
218         [VEC_RESV17]    = "UNASSIGNED RESERVED 17",
219         [VEC_RESV18]    = "UNASSIGNED RESERVED 18",
220         [VEC_RESV19]    = "UNASSIGNED RESERVED 19",
221         [VEC_RESV20]    = "UNASSIGNED RESERVED 20",
222         [VEC_RESV21]    = "UNASSIGNED RESERVED 21",
223         [VEC_RESV22]    = "UNASSIGNED RESERVED 22",
224         [VEC_RESV23]    = "UNASSIGNED RESERVED 23",
225         [VEC_SPUR]      = "SPURIOUS INTERRUPT",
226         [VEC_INT1]      = "LEVEL 1 INT",
227         [VEC_INT2]      = "LEVEL 2 INT",
228         [VEC_INT3]      = "LEVEL 3 INT",
229         [VEC_INT4]      = "LEVEL 4 INT",
230         [VEC_INT5]      = "LEVEL 5 INT",
231         [VEC_INT6]      = "LEVEL 6 INT",
232         [VEC_INT7]      = "LEVEL 7 INT",
233         [VEC_SYS]       = "SYSCALL",
234         [VEC_TRAP1]     = "TRAP #1",
235         [VEC_TRAP2]     = "TRAP #2",
236         [VEC_TRAP3]     = "TRAP #3",
237         [VEC_TRAP4]     = "TRAP #4",
238         [VEC_TRAP5]     = "TRAP #5",
239         [VEC_TRAP6]     = "TRAP #6",
240         [VEC_TRAP7]     = "TRAP #7",
241         [VEC_TRAP8]     = "TRAP #8",
242         [VEC_TRAP9]     = "TRAP #9",
243         [VEC_TRAP10]    = "TRAP #10",
244         [VEC_TRAP11]    = "TRAP #11",
245         [VEC_TRAP12]    = "TRAP #12",
246         [VEC_TRAP13]    = "TRAP #13",
247         [VEC_TRAP14]    = "TRAP #14",
248         [VEC_TRAP15]    = "TRAP #15",
249         [VEC_FPBRUC]    = "FPCP BSUN",
250         [VEC_FPIR]      = "FPCP INEXACT",
251         [VEC_FPDIVZ]    = "FPCP DIV BY 0",
252         [VEC_FPUNDER]   = "FPCP UNDERFLOW",
253         [VEC_FPOE]      = "FPCP OPERAND ERROR",
254         [VEC_FPOVER]    = "FPCP OVERFLOW",
255         [VEC_FPNAN]     = "FPCP SNAN",
256         [VEC_FPUNSUP]   = "FPCP UNSUPPORTED OPERATION",
257         [VEC_MMUCFG]    = "MMU CONFIGURATION ERROR",
258         [VEC_MMUILL]    = "MMU ILLEGAL OPERATION ERROR",
259         [VEC_MMUACC]    = "MMU ACCESS LEVEL VIOLATION ERROR",
260         [VEC_RESV59]    = "UNASSIGNED RESERVED 59",
261         [VEC_UNIMPEA]   = "UNASSIGNED RESERVED 60",
262         [VEC_UNIMPII]   = "UNASSIGNED RESERVED 61",
263         [VEC_RESV62]    = "UNASSIGNED RESERVED 62",
264         [VEC_RESV63]    = "UNASSIGNED RESERVED 63",
265 };
266
267 static const char *space_names[] = {
268         [0]             = "Space 0",
269         [USER_DATA]     = "User Data",
270         [USER_PROGRAM]  = "User Program",
271 #ifndef CONFIG_SUN3
272         [3]             = "Space 3",
273 #else
274         [FC_CONTROL]    = "Control",
275 #endif
276         [4]             = "Space 4",
277         [SUPER_DATA]    = "Super Data",
278         [SUPER_PROGRAM] = "Super Program",
279         [CPU_SPACE]     = "CPU"
280 };
281
282 void die_if_kernel(char *,struct pt_regs *,int);
283 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
284                              unsigned long error_code);
285 int send_fault_sig(struct pt_regs *regs);
286
287 asmlinkage void trap_c(struct frame *fp);
288
289 #if defined (CONFIG_M68060)
290 static inline void access_error060 (struct frame *fp)
291 {
292         unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
293
294 #ifdef DEBUG
295         printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
296 #endif
297
298         if (fslw & MMU060_BPE) {
299                 /* branch prediction error -> clear branch cache */
300                 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
301                                       "orl   #0x00400000,%/d0\n\t"
302                                       "movec %/d0,%/cacr"
303                                       : : : "d0" );
304                 /* return if there's no other error */
305                 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
306                         return;
307         }
308
309         if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
310                 unsigned long errorcode;
311                 unsigned long addr = fp->un.fmt4.effaddr;
312
313                 if (fslw & MMU060_MA)
314                         addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
315
316                 errorcode = 1;
317                 if (fslw & MMU060_DESC_ERR) {
318                         __flush_tlb040_one(addr);
319                         errorcode = 0;
320                 }
321                 if (fslw & MMU060_W)
322                         errorcode |= 2;
323 #ifdef DEBUG
324                 printk("errorcode = %d\n", errorcode );
325 #endif
326                 do_page_fault(&fp->ptregs, addr, errorcode);
327         } else if (fslw & (MMU060_SEE)){
328                 /* Software Emulation Error.
329                  * fault during mem_read/mem_write in ifpsp060/os.S
330                  */
331                 send_fault_sig(&fp->ptregs);
332         } else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
333                    send_fault_sig(&fp->ptregs) > 0) {
334                 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
335                 printk( "68060 access error, fslw=%lx\n", fslw );
336                 trap_c( fp );
337         }
338 }
339 #endif /* CONFIG_M68060 */
340
341 #if defined (CONFIG_M68040)
342 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
343 {
344         unsigned long mmusr;
345         mm_segment_t old_fs = get_fs();
346
347         set_fs(MAKE_MM_SEG(wbs));
348
349         if (iswrite)
350                 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
351         else
352                 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
353
354         asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
355
356         set_fs(old_fs);
357
358         return mmusr;
359 }
360
361 static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
362                                    unsigned long wbd)
363 {
364         int res = 0;
365         mm_segment_t old_fs = get_fs();
366
367         /* set_fs can not be moved, otherwise put_user() may oops */
368         set_fs(MAKE_MM_SEG(wbs));
369
370         switch (wbs & WBSIZ_040) {
371         case BA_SIZE_BYTE:
372                 res = put_user(wbd & 0xff, (char *)wba);
373                 break;
374         case BA_SIZE_WORD:
375                 res = put_user(wbd & 0xffff, (short *)wba);
376                 break;
377         case BA_SIZE_LONG:
378                 res = put_user(wbd, (int *)wba);
379                 break;
380         }
381
382         /* set_fs can not be moved, otherwise put_user() may oops */
383         set_fs(old_fs);
384
385
386 #ifdef DEBUG
387         printk("do_040writeback1, res=%d\n",res);
388 #endif
389
390         return res;
391 }
392
393 /* after an exception in a writeback the stack frame corresponding
394  * to that exception is discarded, set a few bits in the old frame
395  * to simulate what it should look like
396  */
397 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
398 {
399         fp->un.fmt7.faddr = wba;
400         fp->un.fmt7.ssw = wbs & 0xff;
401         if (wba != current->thread.faddr)
402             fp->un.fmt7.ssw |= MA_040;
403 }
404
405 static inline void do_040writebacks(struct frame *fp)
406 {
407         int res = 0;
408 #if 0
409         if (fp->un.fmt7.wb1s & WBV_040)
410                 printk("access_error040: cannot handle 1st writeback. oops.\n");
411 #endif
412
413         if ((fp->un.fmt7.wb2s & WBV_040) &&
414             !(fp->un.fmt7.wb2s & WBTT_040)) {
415                 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
416                                        fp->un.fmt7.wb2d);
417                 if (res)
418                         fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
419                 else
420                         fp->un.fmt7.wb2s = 0;
421         }
422
423         /* do the 2nd wb only if the first one was successful (except for a kernel wb) */
424         if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
425                 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
426                                        fp->un.fmt7.wb3d);
427                 if (res)
428                     {
429                         fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
430
431                         fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
432                         fp->un.fmt7.wb3s &= (~WBV_040);
433                         fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
434                         fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
435                     }
436                 else
437                         fp->un.fmt7.wb3s = 0;
438         }
439
440         if (res)
441                 send_fault_sig(&fp->ptregs);
442 }
443
444 /*
445  * called from sigreturn(), must ensure userspace code didn't
446  * manipulate exception frame to circumvent protection, then complete
447  * pending writebacks
448  * we just clear TM2 to turn it into an userspace access
449  */
450 asmlinkage void berr_040cleanup(struct frame *fp)
451 {
452         fp->un.fmt7.wb2s &= ~4;
453         fp->un.fmt7.wb3s &= ~4;
454
455         do_040writebacks(fp);
456 }
457
458 static inline void access_error040(struct frame *fp)
459 {
460         unsigned short ssw = fp->un.fmt7.ssw;
461         unsigned long mmusr;
462
463 #ifdef DEBUG
464         printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
465         printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
466                 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
467         printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
468                 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
469                 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
470 #endif
471
472         if (ssw & ATC_040) {
473                 unsigned long addr = fp->un.fmt7.faddr;
474                 unsigned long errorcode;
475
476                 /*
477                  * The MMU status has to be determined AFTER the address
478                  * has been corrected if there was a misaligned access (MA).
479                  */
480                 if (ssw & MA_040)
481                         addr = (addr + 7) & -8;
482
483                 /* MMU error, get the MMUSR info for this access */
484                 mmusr = probe040(!(ssw & RW_040), addr, ssw);
485 #ifdef DEBUG
486                 printk("mmusr = %lx\n", mmusr);
487 #endif
488                 errorcode = 1;
489                 if (!(mmusr & MMU_R_040)) {
490                         /* clear the invalid atc entry */
491                         __flush_tlb040_one(addr);
492                         errorcode = 0;
493                 }
494
495                 /* despite what documentation seems to say, RMW
496                  * accesses have always both the LK and RW bits set */
497                 if (!(ssw & RW_040) || (ssw & LK_040))
498                         errorcode |= 2;
499
500                 if (do_page_fault(&fp->ptregs, addr, errorcode)) {
501 #ifdef DEBUG
502                         printk("do_page_fault() !=0 \n");
503 #endif
504                         if (user_mode(&fp->ptregs)){
505                                 /* delay writebacks after signal delivery */
506 #ifdef DEBUG
507                                 printk(".. was usermode - return\n");
508 #endif
509                                 return;
510                         }
511                         /* disable writeback into user space from kernel
512                          * (if do_page_fault didn't fix the mapping,
513                          * the writeback won't do good)
514                          */
515 #ifdef DEBUG
516                         printk(".. disabling wb2\n");
517 #endif
518                         if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
519                                 fp->un.fmt7.wb2s &= ~WBV_040;
520                 }
521         } else if (send_fault_sig(&fp->ptregs) > 0) {
522                 printk("68040 access error, ssw=%x\n", ssw);
523                 trap_c(fp);
524         }
525
526         do_040writebacks(fp);
527 }
528 #endif /* CONFIG_M68040 */
529
530 #if defined(CONFIG_SUN3)
531 #include <asm/sun3mmu.h>
532
533 extern int mmu_emu_handle_fault (unsigned long, int, int);
534
535 /* sun3 version of bus_error030 */
536
537 static inline void bus_error030 (struct frame *fp)
538 {
539         unsigned char buserr_type = sun3_get_buserr ();
540         unsigned long addr, errorcode;
541         unsigned short ssw = fp->un.fmtb.ssw;
542         extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
543
544 #ifdef DEBUG
545         if (ssw & (FC | FB))
546                 printk ("Instruction fault at %#010lx\n",
547                         ssw & FC ?
548                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
549                         :
550                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
551         if (ssw & DF)
552                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
553                         ssw & RW ? "read" : "write",
554                         fp->un.fmtb.daddr,
555                         space_names[ssw & DFC], fp->ptregs.pc);
556 #endif
557
558         /*
559          * Check if this page should be demand-mapped. This needs to go before
560          * the testing for a bad kernel-space access (demand-mapping applies
561          * to kernel accesses too).
562          */
563
564         if ((ssw & DF)
565             && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
566                 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
567                         return;
568         }
569
570         /* Check for kernel-space pagefault (BAD). */
571         if (fp->ptregs.sr & PS_S) {
572                 /* kernel fault must be a data fault to user space */
573                 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
574                      // try checking the kernel mappings before surrender
575                      if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
576                           return;
577                         /* instruction fault or kernel data fault! */
578                         if (ssw & (FC | FB))
579                                 printk ("Instruction fault at %#010lx\n",
580                                         fp->ptregs.pc);
581                         if (ssw & DF) {
582                                 /* was this fault incurred testing bus mappings? */
583                                 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
584                                    (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
585                                         send_fault_sig(&fp->ptregs);
586                                         return;
587                                 }
588
589                                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
590                                         ssw & RW ? "read" : "write",
591                                         fp->un.fmtb.daddr,
592                                         space_names[ssw & DFC], fp->ptregs.pc);
593                         }
594                         printk ("BAD KERNEL BUSERR\n");
595
596                         die_if_kernel("Oops", &fp->ptregs,0);
597                         force_sig(SIGKILL, current);
598                         return;
599                 }
600         } else {
601                 /* user fault */
602                 if (!(ssw & (FC | FB)) && !(ssw & DF))
603                         /* not an instruction fault or data fault! BAD */
604                         panic ("USER BUSERR w/o instruction or data fault");
605         }
606
607
608         /* First handle the data fault, if any.  */
609         if (ssw & DF) {
610                 addr = fp->un.fmtb.daddr;
611
612 // errorcode bit 0:     0 -> no page            1 -> protection fault
613 // errorcode bit 1:     0 -> read fault         1 -> write fault
614
615 // (buserr_type & SUN3_BUSERR_PROTERR)  -> protection fault
616 // (buserr_type & SUN3_BUSERR_INVALID)  -> invalid page fault
617
618                 if (buserr_type & SUN3_BUSERR_PROTERR)
619                         errorcode = 0x01;
620                 else if (buserr_type & SUN3_BUSERR_INVALID)
621                         errorcode = 0x00;
622                 else {
623 #ifdef DEBUG
624                         printk ("*** unexpected busfault type=%#04x\n", buserr_type);
625                         printk ("invalid %s access at %#lx from pc %#lx\n",
626                                 !(ssw & RW) ? "write" : "read", addr,
627                                 fp->ptregs.pc);
628 #endif
629                         die_if_kernel ("Oops", &fp->ptregs, buserr_type);
630                         force_sig (SIGBUS, current);
631                         return;
632                 }
633
634 //todo: wtf is RM bit? --m
635                 if (!(ssw & RW) || ssw & RM)
636                         errorcode |= 0x02;
637
638                 /* Handle page fault. */
639                 do_page_fault (&fp->ptregs, addr, errorcode);
640
641                 /* Retry the data fault now. */
642                 return;
643         }
644
645         /* Now handle the instruction fault. */
646
647         /* Get the fault address. */
648         if (fp->ptregs.format == 0xA)
649                 addr = fp->ptregs.pc + 4;
650         else
651                 addr = fp->un.fmtb.baddr;
652         if (ssw & FC)
653                 addr -= 2;
654
655         if (buserr_type & SUN3_BUSERR_INVALID) {
656                 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
657                         do_page_fault (&fp->ptregs, addr, 0);
658        } else {
659 #ifdef DEBUG
660                 printk ("protection fault on insn access (segv).\n");
661 #endif
662                 force_sig (SIGSEGV, current);
663        }
664 }
665 #else
666 #if defined(CPU_M68020_OR_M68030)
667 static inline void bus_error030 (struct frame *fp)
668 {
669         volatile unsigned short temp;
670         unsigned short mmusr;
671         unsigned long addr, errorcode;
672         unsigned short ssw = fp->un.fmtb.ssw;
673 #ifdef DEBUG
674         unsigned long desc;
675
676         printk ("pid = %x  ", current->pid);
677         printk ("SSW=%#06x  ", ssw);
678
679         if (ssw & (FC | FB))
680                 printk ("Instruction fault at %#010lx\n",
681                         ssw & FC ?
682                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
683                         :
684                         fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
685         if (ssw & DF)
686                 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
687                         ssw & RW ? "read" : "write",
688                         fp->un.fmtb.daddr,
689                         space_names[ssw & DFC], fp->ptregs.pc);
690 #endif
691
692         /* ++andreas: If a data fault and an instruction fault happen
693            at the same time map in both pages.  */
694
695         /* First handle the data fault, if any.  */
696         if (ssw & DF) {
697                 addr = fp->un.fmtb.daddr;
698
699 #ifdef DEBUG
700                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
701                               "pmove %%psr,%1@"
702                               : "=a&" (desc)
703                               : "a" (&temp), "a" (addr), "d" (ssw));
704 #else
705                 asm volatile ("ptestr %2,%1@,#7\n\t"
706                               "pmove %%psr,%0@"
707                               : : "a" (&temp), "a" (addr), "d" (ssw));
708 #endif
709                 mmusr = temp;
710
711 #ifdef DEBUG
712                 printk("mmusr is %#x for addr %#lx in task %p\n",
713                        mmusr, addr, current);
714                 printk("descriptor address is %#lx, contents %#lx\n",
715                        __va(desc), *(unsigned long *)__va(desc));
716 #endif
717
718                 errorcode = (mmusr & MMU_I) ? 0 : 1;
719                 if (!(ssw & RW) || (ssw & RM))
720                         errorcode |= 2;
721
722                 if (mmusr & (MMU_I | MMU_WP)) {
723                         if (ssw & 4) {
724                                 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
725                                        ssw & RW ? "read" : "write",
726                                        fp->un.fmtb.daddr,
727                                        space_names[ssw & DFC], fp->ptregs.pc);
728                                 goto buserr;
729                         }
730                         /* Don't try to do anything further if an exception was
731                            handled. */
732                         if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
733                                 return;
734                 } else if (!(mmusr & MMU_I)) {
735                         /* probably a 020 cas fault */
736                         if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
737                                 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
738                 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
739                         printk("invalid %s access at %#lx from pc %#lx\n",
740                                !(ssw & RW) ? "write" : "read", addr,
741                                fp->ptregs.pc);
742                         die_if_kernel("Oops",&fp->ptregs,mmusr);
743                         force_sig(SIGSEGV, current);
744                         return;
745                 } else {
746 #if 0
747                         static volatile long tlong;
748 #endif
749
750                         printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
751                                !(ssw & RW) ? "write" : "read", addr,
752                                fp->ptregs.pc, ssw);
753                         asm volatile ("ptestr #1,%1@,#0\n\t"
754                                       "pmove %%psr,%0@"
755                                       : /* no outputs */
756                                       : "a" (&temp), "a" (addr));
757                         mmusr = temp;
758
759                         printk ("level 0 mmusr is %#x\n", mmusr);
760 #if 0
761                         asm volatile ("pmove %%tt0,%0@"
762                                       : /* no outputs */
763                                       : "a" (&tlong));
764                         printk("tt0 is %#lx, ", tlong);
765                         asm volatile ("pmove %%tt1,%0@"
766                                       : /* no outputs */
767                                       : "a" (&tlong));
768                         printk("tt1 is %#lx\n", tlong);
769 #endif
770 #ifdef DEBUG
771                         printk("Unknown SIGSEGV - 1\n");
772 #endif
773                         die_if_kernel("Oops",&fp->ptregs,mmusr);
774                         force_sig(SIGSEGV, current);
775                         return;
776                 }
777
778                 /* setup an ATC entry for the access about to be retried */
779                 if (!(ssw & RW) || (ssw & RM))
780                         asm volatile ("ploadw %1,%0@" : /* no outputs */
781                                       : "a" (addr), "d" (ssw));
782                 else
783                         asm volatile ("ploadr %1,%0@" : /* no outputs */
784                                       : "a" (addr), "d" (ssw));
785         }
786
787         /* Now handle the instruction fault. */
788
789         if (!(ssw & (FC|FB)))
790                 return;
791
792         if (fp->ptregs.sr & PS_S) {
793                 printk("Instruction fault at %#010lx\n",
794                         fp->ptregs.pc);
795         buserr:
796                 printk ("BAD KERNEL BUSERR\n");
797                 die_if_kernel("Oops",&fp->ptregs,0);
798                 force_sig(SIGKILL, current);
799                 return;
800         }
801
802         /* get the fault address */
803         if (fp->ptregs.format == 10)
804                 addr = fp->ptregs.pc + 4;
805         else
806                 addr = fp->un.fmtb.baddr;
807         if (ssw & FC)
808                 addr -= 2;
809
810         if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
811                 /* Insn fault on same page as data fault.  But we
812                    should still create the ATC entry.  */
813                 goto create_atc_entry;
814
815 #ifdef DEBUG
816         asm volatile ("ptestr #1,%2@,#7,%0\n\t"
817                       "pmove %%psr,%1@"
818                       : "=a&" (desc)
819                       : "a" (&temp), "a" (addr));
820 #else
821         asm volatile ("ptestr #1,%1@,#7\n\t"
822                       "pmove %%psr,%0@"
823                       : : "a" (&temp), "a" (addr));
824 #endif
825         mmusr = temp;
826
827 #ifdef DEBUG
828         printk ("mmusr is %#x for addr %#lx in task %p\n",
829                 mmusr, addr, current);
830         printk ("descriptor address is %#lx, contents %#lx\n",
831                 __va(desc), *(unsigned long *)__va(desc));
832 #endif
833
834         if (mmusr & MMU_I)
835                 do_page_fault (&fp->ptregs, addr, 0);
836         else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
837                 printk ("invalid insn access at %#lx from pc %#lx\n",
838                         addr, fp->ptregs.pc);
839 #ifdef DEBUG
840                 printk("Unknown SIGSEGV - 2\n");
841 #endif
842                 die_if_kernel("Oops",&fp->ptregs,mmusr);
843                 force_sig(SIGSEGV, current);
844                 return;
845         }
846
847 create_atc_entry:
848         /* setup an ATC entry for the access about to be retried */
849         asm volatile ("ploadr #2,%0@" : /* no outputs */
850                       : "a" (addr));
851 }
852 #endif /* CPU_M68020_OR_M68030 */
853 #endif /* !CONFIG_SUN3 */
854
855 asmlinkage void buserr_c(struct frame *fp)
856 {
857         /* Only set esp0 if coming from user mode */
858         if (user_mode(&fp->ptregs))
859                 current->thread.esp0 = (unsigned long) fp;
860
861 #ifdef DEBUG
862         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
863 #endif
864
865         switch (fp->ptregs.format) {
866 #if defined (CONFIG_M68060)
867         case 4:                         /* 68060 access error */
868           access_error060 (fp);
869           break;
870 #endif
871 #if defined (CONFIG_M68040)
872         case 0x7:                       /* 68040 access error */
873           access_error040 (fp);
874           break;
875 #endif
876 #if defined (CPU_M68020_OR_M68030)
877         case 0xa:
878         case 0xb:
879           bus_error030 (fp);
880           break;
881 #endif
882         default:
883           die_if_kernel("bad frame format",&fp->ptregs,0);
884 #ifdef DEBUG
885           printk("Unknown SIGSEGV - 4\n");
886 #endif
887           force_sig(SIGSEGV, current);
888         }
889 }
890
891
892 static int kstack_depth_to_print = 48;
893
894 void show_trace(unsigned long *stack)
895 {
896         unsigned long *endstack;
897         unsigned long addr;
898         int i;
899
900         printk("Call Trace:");
901         addr = (unsigned long)stack + THREAD_SIZE - 1;
902         endstack = (unsigned long *)(addr & -THREAD_SIZE);
903         i = 0;
904         while (stack + 1 <= endstack) {
905                 addr = *stack++;
906                 /*
907                  * If the address is either in the text segment of the
908                  * kernel, or in the region which contains vmalloc'ed
909                  * memory, it *may* be the address of a calling
910                  * routine; if so, print it so that someone tracing
911                  * down the cause of the crash will be able to figure
912                  * out the call path that was taken.
913                  */
914                 if (__kernel_text_address(addr)) {
915 #ifndef CONFIG_KALLSYMS
916                         if (i % 5 == 0)
917                                 printk("\n       ");
918 #endif
919                         printk(" [<%08lx>]", addr);
920                         print_symbol(" %s\n", addr);
921                         i++;
922                 }
923         }
924         printk("\n");
925 }
926
927 void show_registers(struct pt_regs *regs)
928 {
929         struct frame *fp = (struct frame *)regs;
930         unsigned long addr;
931         int i;
932
933         addr = (unsigned long)&fp->un;
934         printk("Frame format=%X ", fp->ptregs.format);
935         switch (fp->ptregs.format) {
936         case 0x2:
937             printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
938             addr += sizeof(fp->un.fmt2);
939             break;
940         case 0x3:
941             printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
942             addr += sizeof(fp->un.fmt3);
943             break;
944         case 0x4:
945             printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
946                     : "eff addr=%08lx pc=%08lx\n"),
947                    fp->un.fmt4.effaddr, fp->un.fmt4.pc);
948             addr += sizeof(fp->un.fmt4);
949             break;
950         case 0x7:
951             printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
952                    fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
953             printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
954                    fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
955             printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
956                    fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
957             printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
958                    fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
959             printk("push data: %08lx %08lx %08lx %08lx\n",
960                    fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
961                    fp->un.fmt7.pd3);
962             addr += sizeof(fp->un.fmt7);
963             break;
964         case 0x9:
965             printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
966             addr += sizeof(fp->un.fmt9);
967             break;
968         case 0xa:
969             printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
970                    fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
971                    fp->un.fmta.daddr, fp->un.fmta.dobuf);
972             addr += sizeof(fp->un.fmta);
973             break;
974         case 0xb:
975             printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
976                    fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
977                    fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
978             printk("baddr=%08lx dibuf=%08lx ver=%x\n",
979                    fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
980             addr += sizeof(fp->un.fmtb);
981             break;
982         default:
983             printk("\n");
984         }
985         show_stack(NULL, (unsigned long *)addr);
986
987         printk("Code: ");
988         for (i = 0; i < 10; i++)
989                 printk("%04x ", 0xffff & ((short *) fp->ptregs.pc)[i]);
990         printk ("\n");
991 }
992
993 void show_stack(struct task_struct *task, unsigned long *stack)
994 {
995         unsigned long *endstack;
996         int i;
997
998         if (!stack) {
999                 if (task)
1000                         stack = (unsigned long *)task->thread.esp0;
1001                 else
1002                         stack = (unsigned long *)&stack;
1003         }
1004         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
1005
1006         printk("Stack from %08lx:", (unsigned long)stack);
1007         for (i = 0; i < kstack_depth_to_print; i++) {
1008                 if (stack + 1 > endstack)
1009                         break;
1010                 if (i % 8 == 0)
1011                         printk("\n       ");
1012                 printk(" %08lx", *stack++);
1013         }
1014         printk("\n");
1015         show_trace(stack);
1016 }
1017
1018 /*
1019  * The architecture-independent backtrace generator
1020  */
1021 void dump_stack(void)
1022 {
1023         unsigned long stack;
1024
1025         show_trace(&stack);
1026 }
1027
1028 EXPORT_SYMBOL(dump_stack);
1029
1030 void bad_super_trap (struct frame *fp)
1031 {
1032         console_verbose();
1033         if (fp->ptregs.vector < 4*sizeof(vec_names)/sizeof(vec_names[0]))
1034                 printk ("*** %s ***   FORMAT=%X\n",
1035                         vec_names[(fp->ptregs.vector) >> 2],
1036                         fp->ptregs.format);
1037         else
1038                 printk ("*** Exception %d ***   FORMAT=%X\n",
1039                         (fp->ptregs.vector) >> 2,
1040                         fp->ptregs.format);
1041         if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1042                 unsigned short ssw = fp->un.fmtb.ssw;
1043
1044                 printk ("SSW=%#06x  ", ssw);
1045
1046                 if (ssw & RC)
1047                         printk ("Pipe stage C instruction fault at %#010lx\n",
1048                                 (fp->ptregs.format) == 0xA ?
1049                                 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1050                 if (ssw & RB)
1051                         printk ("Pipe stage B instruction fault at %#010lx\n",
1052                                 (fp->ptregs.format) == 0xA ?
1053                                 fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1054                 if (ssw & DF)
1055                         printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1056                                 ssw & RW ? "read" : "write",
1057                                 fp->un.fmtb.daddr, space_names[ssw & DFC],
1058                                 fp->ptregs.pc);
1059         }
1060         printk ("Current process id is %d\n", current->pid);
1061         die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1062 }
1063
1064 asmlinkage void trap_c(struct frame *fp)
1065 {
1066         int sig;
1067         siginfo_t info;
1068
1069         if (fp->ptregs.sr & PS_S) {
1070                 if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1071                         /* traced a trapping instruction */
1072                         current->ptrace |= PT_DTRACE;
1073                 } else
1074                         bad_super_trap(fp);
1075                 return;
1076         }
1077
1078         /* send the appropriate signal to the user program */
1079         switch ((fp->ptregs.vector) >> 2) {
1080             case VEC_ADDRERR:
1081                 info.si_code = BUS_ADRALN;
1082                 sig = SIGBUS;
1083                 break;
1084             case VEC_ILLEGAL:
1085             case VEC_LINE10:
1086             case VEC_LINE11:
1087                 info.si_code = ILL_ILLOPC;
1088                 sig = SIGILL;
1089                 break;
1090             case VEC_PRIV:
1091                 info.si_code = ILL_PRVOPC;
1092                 sig = SIGILL;
1093                 break;
1094             case VEC_COPROC:
1095                 info.si_code = ILL_COPROC;
1096                 sig = SIGILL;
1097                 break;
1098             case VEC_TRAP1:
1099             case VEC_TRAP2:
1100             case VEC_TRAP3:
1101             case VEC_TRAP4:
1102             case VEC_TRAP5:
1103             case VEC_TRAP6:
1104             case VEC_TRAP7:
1105             case VEC_TRAP8:
1106             case VEC_TRAP9:
1107             case VEC_TRAP10:
1108             case VEC_TRAP11:
1109             case VEC_TRAP12:
1110             case VEC_TRAP13:
1111             case VEC_TRAP14:
1112                 info.si_code = ILL_ILLTRP;
1113                 sig = SIGILL;
1114                 break;
1115             case VEC_FPBRUC:
1116             case VEC_FPOE:
1117             case VEC_FPNAN:
1118                 info.si_code = FPE_FLTINV;
1119                 sig = SIGFPE;
1120                 break;
1121             case VEC_FPIR:
1122                 info.si_code = FPE_FLTRES;
1123                 sig = SIGFPE;
1124                 break;
1125             case VEC_FPDIVZ:
1126                 info.si_code = FPE_FLTDIV;
1127                 sig = SIGFPE;
1128                 break;
1129             case VEC_FPUNDER:
1130                 info.si_code = FPE_FLTUND;
1131                 sig = SIGFPE;
1132                 break;
1133             case VEC_FPOVER:
1134                 info.si_code = FPE_FLTOVF;
1135                 sig = SIGFPE;
1136                 break;
1137             case VEC_ZERODIV:
1138                 info.si_code = FPE_INTDIV;
1139                 sig = SIGFPE;
1140                 break;
1141             case VEC_CHK:
1142             case VEC_TRAP:
1143                 info.si_code = FPE_INTOVF;
1144                 sig = SIGFPE;
1145                 break;
1146             case VEC_TRACE:             /* ptrace single step */
1147                 info.si_code = TRAP_TRACE;
1148                 sig = SIGTRAP;
1149                 break;
1150             case VEC_TRAP15:            /* breakpoint */
1151                 info.si_code = TRAP_BRKPT;
1152                 sig = SIGTRAP;
1153                 break;
1154             default:
1155                 info.si_code = ILL_ILLOPC;
1156                 sig = SIGILL;
1157                 break;
1158         }
1159         info.si_signo = sig;
1160         info.si_errno = 0;
1161         switch (fp->ptregs.format) {
1162             default:
1163                 info.si_addr = (void *) fp->ptregs.pc;
1164                 break;
1165             case 2:
1166                 info.si_addr = (void *) fp->un.fmt2.iaddr;
1167                 break;
1168             case 7:
1169                 info.si_addr = (void *) fp->un.fmt7.effaddr;
1170                 break;
1171             case 9:
1172                 info.si_addr = (void *) fp->un.fmt9.iaddr;
1173                 break;
1174             case 10:
1175                 info.si_addr = (void *) fp->un.fmta.daddr;
1176                 break;
1177             case 11:
1178                 info.si_addr = (void *) fp->un.fmtb.daddr;
1179                 break;
1180         }
1181         force_sig_info (sig, &info, current);
1182 }
1183
1184 void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1185 {
1186         if (!(fp->sr & PS_S))
1187                 return;
1188
1189         console_verbose();
1190         printk("%s: %08x\n",str,nr);
1191         print_modules();
1192         printk("PC: [<%08lx>]",fp->pc);
1193         print_symbol(" %s\n", fp->pc);
1194         printk("\nSR: %04x  SP: %p  a2: %08lx\n",
1195                fp->sr, fp, fp->a2);
1196         printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
1197                fp->d0, fp->d1, fp->d2, fp->d3);
1198         printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
1199                fp->d4, fp->d5, fp->a0, fp->a1);
1200
1201         printk("Process %s (pid: %d, stackpage=%08lx)\n",
1202                 current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
1203         show_stack(NULL, (unsigned long *)fp);
1204         do_exit(SIGSEGV);
1205 }
1206
1207 /*
1208  * This function is called if an error occur while accessing
1209  * user-space from the fpsp040 code.
1210  */
1211 asmlinkage void fpsp040_die(void)
1212 {
1213         do_exit(SIGSEGV);
1214 }
1215
1216 #ifdef CONFIG_M68KFPU_EMU
1217 asmlinkage void fpemu_signal(int signal, int code, void *addr)
1218 {
1219         siginfo_t info;
1220
1221         info.si_signo = signal;
1222         info.si_errno = 0;
1223         info.si_code = code;
1224         info.si_addr = addr;
1225         force_sig_info(signal, &info, current);
1226 }
1227 #endif