2
* linux/arch/m68k/kernel/traps.c
4
* Copyright (C) 1993, 1994 by Hamish Macdonald
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
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
18
* Sets up all exception vectors
21
#include <linux/sched.h>
22
#include <linux/signal.h>
23
#include <linux/kernel.h>
25
#include <linux/module.h>
26
#include <linux/user.h>
27
#include <linux/string.h>
28
#include <linux/linkage.h>
29
#include <linux/init.h>
30
#include <linux/ptrace.h>
31
#include <linux/kallsyms.h>
33
#include <asm/setup.h>
35
#include <asm/system.h>
36
#include <asm/uaccess.h>
37
#include <asm/traps.h>
38
#include <asm/pgalloc.h>
39
#include <asm/machdep.h>
40
#include <asm/siginfo.h>
42
/* assembler routines */
43
asmlinkage void system_call(void);
44
asmlinkage void buserr(void);
45
asmlinkage void trap(void);
46
asmlinkage void nmihandler(void);
47
#ifdef CONFIG_M68KFPU_EMU
48
asmlinkage void fpu_emu(void);
51
e_vector vectors[256] = {
52
[VEC_BUSERR] = buserr,
53
[VEC_SYS] = system_call,
56
/* nmi handler for the Amiga */
62
* this must be called very early as the kernel might
63
* use some instruction that are emulated on the 060
65
void __init base_trap_init(void)
68
extern e_vector *sun3x_prom_vbr;
70
__asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
73
/* setup the exception vector table */
74
__asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
77
/* set up ISP entry points */
78
asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
80
vectors[VEC_UNIMPII] = unimp_vec;
84
void __init trap_init (void)
88
for (i = VEC_SPUR; i <= VEC_INT7; i++)
89
vectors[i] = bad_inthandler;
91
for (i = 0; i < VEC_USER; i++)
95
for (i = VEC_USER; i < 256; i++)
96
vectors[i] = bad_inthandler;
98
#ifdef CONFIG_M68KFPU_EMU
100
vectors[VEC_LINE11] = fpu_emu;
103
if (CPU_IS_040 && !FPU_IS_EMU) {
104
/* set up FPSP entry points */
105
asmlinkage void dz_vec(void) asm ("dz");
106
asmlinkage void inex_vec(void) asm ("inex");
107
asmlinkage void ovfl_vec(void) asm ("ovfl");
108
asmlinkage void unfl_vec(void) asm ("unfl");
109
asmlinkage void snan_vec(void) asm ("snan");
110
asmlinkage void operr_vec(void) asm ("operr");
111
asmlinkage void bsun_vec(void) asm ("bsun");
112
asmlinkage void fline_vec(void) asm ("fline");
113
asmlinkage void unsupp_vec(void) asm ("unsupp");
115
vectors[VEC_FPDIVZ] = dz_vec;
116
vectors[VEC_FPIR] = inex_vec;
117
vectors[VEC_FPOVER] = ovfl_vec;
118
vectors[VEC_FPUNDER] = unfl_vec;
119
vectors[VEC_FPNAN] = snan_vec;
120
vectors[VEC_FPOE] = operr_vec;
121
vectors[VEC_FPBRUC] = bsun_vec;
122
vectors[VEC_LINE11] = fline_vec;
123
vectors[VEC_FPUNSUP] = unsupp_vec;
126
if (CPU_IS_060 && !FPU_IS_EMU) {
127
/* set up IFPSP entry points */
128
asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
129
asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
130
asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
131
asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
132
asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
133
asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
134
asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
135
asmlinkage void unsupp_vec6(void) asm ("_060_fpsp_unsupp");
136
asmlinkage void effadd_vec6(void) asm ("_060_fpsp_effadd");
138
vectors[VEC_FPNAN] = snan_vec6;
139
vectors[VEC_FPOE] = operr_vec6;
140
vectors[VEC_FPOVER] = ovfl_vec6;
141
vectors[VEC_FPUNDER] = unfl_vec6;
142
vectors[VEC_FPDIVZ] = dz_vec6;
143
vectors[VEC_FPIR] = inex_vec6;
144
vectors[VEC_LINE11] = fline_vec6;
145
vectors[VEC_FPUNSUP] = unsupp_vec6;
146
vectors[VEC_UNIMPEA] = effadd_vec6;
149
/* if running on an amiga, make the NMI interrupt do nothing */
151
vectors[VEC_INT7] = nmihandler;
156
static const char *vec_names[] = {
157
[VEC_RESETSP] = "RESET SP",
158
[VEC_RESETPC] = "RESET PC",
159
[VEC_BUSERR] = "BUS ERROR",
160
[VEC_ADDRERR] = "ADDRESS ERROR",
161
[VEC_ILLEGAL] = "ILLEGAL INSTRUCTION",
162
[VEC_ZERODIV] = "ZERO DIVIDE",
164
[VEC_TRAP] = "TRAPcc",
165
[VEC_PRIV] = "PRIVILEGE VIOLATION",
166
[VEC_TRACE] = "TRACE",
167
[VEC_LINE10] = "LINE 1010",
168
[VEC_LINE11] = "LINE 1111",
169
[VEC_RESV12] = "UNASSIGNED RESERVED 12",
170
[VEC_COPROC] = "COPROCESSOR PROTOCOL VIOLATION",
171
[VEC_FORMAT] = "FORMAT ERROR",
172
[VEC_UNINT] = "UNINITIALIZED INTERRUPT",
173
[VEC_RESV16] = "UNASSIGNED RESERVED 16",
174
[VEC_RESV17] = "UNASSIGNED RESERVED 17",
175
[VEC_RESV18] = "UNASSIGNED RESERVED 18",
176
[VEC_RESV19] = "UNASSIGNED RESERVED 19",
177
[VEC_RESV20] = "UNASSIGNED RESERVED 20",
178
[VEC_RESV21] = "UNASSIGNED RESERVED 21",
179
[VEC_RESV22] = "UNASSIGNED RESERVED 22",
180
[VEC_RESV23] = "UNASSIGNED RESERVED 23",
181
[VEC_SPUR] = "SPURIOUS INTERRUPT",
182
[VEC_INT1] = "LEVEL 1 INT",
183
[VEC_INT2] = "LEVEL 2 INT",
184
[VEC_INT3] = "LEVEL 3 INT",
185
[VEC_INT4] = "LEVEL 4 INT",
186
[VEC_INT5] = "LEVEL 5 INT",
187
[VEC_INT6] = "LEVEL 6 INT",
188
[VEC_INT7] = "LEVEL 7 INT",
189
[VEC_SYS] = "SYSCALL",
190
[VEC_TRAP1] = "TRAP #1",
191
[VEC_TRAP2] = "TRAP #2",
192
[VEC_TRAP3] = "TRAP #3",
193
[VEC_TRAP4] = "TRAP #4",
194
[VEC_TRAP5] = "TRAP #5",
195
[VEC_TRAP6] = "TRAP #6",
196
[VEC_TRAP7] = "TRAP #7",
197
[VEC_TRAP8] = "TRAP #8",
198
[VEC_TRAP9] = "TRAP #9",
199
[VEC_TRAP10] = "TRAP #10",
200
[VEC_TRAP11] = "TRAP #11",
201
[VEC_TRAP12] = "TRAP #12",
202
[VEC_TRAP13] = "TRAP #13",
203
[VEC_TRAP14] = "TRAP #14",
204
[VEC_TRAP15] = "TRAP #15",
205
[VEC_FPBRUC] = "FPCP BSUN",
206
[VEC_FPIR] = "FPCP INEXACT",
207
[VEC_FPDIVZ] = "FPCP DIV BY 0",
208
[VEC_FPUNDER] = "FPCP UNDERFLOW",
209
[VEC_FPOE] = "FPCP OPERAND ERROR",
210
[VEC_FPOVER] = "FPCP OVERFLOW",
211
[VEC_FPNAN] = "FPCP SNAN",
212
[VEC_FPUNSUP] = "FPCP UNSUPPORTED OPERATION",
213
[VEC_MMUCFG] = "MMU CONFIGURATION ERROR",
214
[VEC_MMUILL] = "MMU ILLEGAL OPERATION ERROR",
215
[VEC_MMUACC] = "MMU ACCESS LEVEL VIOLATION ERROR",
216
[VEC_RESV59] = "UNASSIGNED RESERVED 59",
217
[VEC_UNIMPEA] = "UNASSIGNED RESERVED 60",
218
[VEC_UNIMPII] = "UNASSIGNED RESERVED 61",
219
[VEC_RESV62] = "UNASSIGNED RESERVED 62",
220
[VEC_RESV63] = "UNASSIGNED RESERVED 63",
223
static const char *space_names[] = {
225
[USER_DATA] = "User Data",
226
[USER_PROGRAM] = "User Program",
230
[FC_CONTROL] = "Control",
233
[SUPER_DATA] = "Super Data",
234
[SUPER_PROGRAM] = "Super Program",
238
void die_if_kernel(char *,struct pt_regs *,int);
239
asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
240
unsigned long error_code);
241
int send_fault_sig(struct pt_regs *regs);
243
asmlinkage void trap_c(struct frame *fp);
245
#if defined (CONFIG_M68060)
246
static inline void access_error060 (struct frame *fp)
248
unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
251
printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
254
if (fslw & MMU060_BPE) {
255
/* branch prediction error -> clear branch cache */
256
__asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
257
"orl #0x00400000,%/d0\n\t"
260
/* return if there's no other error */
261
if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
265
if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
266
unsigned long errorcode;
267
unsigned long addr = fp->un.fmt4.effaddr;
269
if (fslw & MMU060_MA)
270
addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
273
if (fslw & MMU060_DESC_ERR) {
274
__flush_tlb040_one(addr);
280
printk("errorcode = %d\n", errorcode );
282
do_page_fault(&fp->ptregs, addr, errorcode);
283
} else if (fslw & (MMU060_SEE)){
284
/* Software Emulation Error.
285
* fault during mem_read/mem_write in ifpsp060/os.S
287
send_fault_sig(&fp->ptregs);
288
} else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
289
send_fault_sig(&fp->ptregs) > 0) {
290
printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
291
printk( "68060 access error, fslw=%lx\n", fslw );
295
#endif /* CONFIG_M68060 */
297
#if defined (CONFIG_M68040)
298
static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
301
mm_segment_t old_fs = get_fs();
303
set_fs(MAKE_MM_SEG(wbs));
306
asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
308
asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
310
asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
317
static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
321
mm_segment_t old_fs = get_fs();
323
/* set_fs can not be moved, otherwise put_user() may oops */
324
set_fs(MAKE_MM_SEG(wbs));
326
switch (wbs & WBSIZ_040) {
328
res = put_user(wbd & 0xff, (char __user *)wba);
331
res = put_user(wbd & 0xffff, (short __user *)wba);
334
res = put_user(wbd, (int __user *)wba);
338
/* set_fs can not be moved, otherwise put_user() may oops */
343
printk("do_040writeback1, res=%d\n",res);
349
/* after an exception in a writeback the stack frame corresponding
350
* to that exception is discarded, set a few bits in the old frame
351
* to simulate what it should look like
353
static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
355
fp->un.fmt7.faddr = wba;
356
fp->un.fmt7.ssw = wbs & 0xff;
357
if (wba != current->thread.faddr)
358
fp->un.fmt7.ssw |= MA_040;
361
static inline void do_040writebacks(struct frame *fp)
365
if (fp->un.fmt7.wb1s & WBV_040)
366
printk("access_error040: cannot handle 1st writeback. oops.\n");
369
if ((fp->un.fmt7.wb2s & WBV_040) &&
370
!(fp->un.fmt7.wb2s & WBTT_040)) {
371
res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
374
fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
376
fp->un.fmt7.wb2s = 0;
379
/* do the 2nd wb only if the first one was successful (except for a kernel wb) */
380
if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
381
res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
385
fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
387
fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
388
fp->un.fmt7.wb3s &= (~WBV_040);
389
fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
390
fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
393
fp->un.fmt7.wb3s = 0;
397
send_fault_sig(&fp->ptregs);
401
* called from sigreturn(), must ensure userspace code didn't
402
* manipulate exception frame to circumvent protection, then complete
404
* we just clear TM2 to turn it into a userspace access
406
asmlinkage void berr_040cleanup(struct frame *fp)
408
fp->un.fmt7.wb2s &= ~4;
409
fp->un.fmt7.wb3s &= ~4;
411
do_040writebacks(fp);
414
static inline void access_error040(struct frame *fp)
416
unsigned short ssw = fp->un.fmt7.ssw;
420
printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
421
printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
422
fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
423
printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
424
fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
425
fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
429
unsigned long addr = fp->un.fmt7.faddr;
430
unsigned long errorcode;
433
* The MMU status has to be determined AFTER the address
434
* has been corrected if there was a misaligned access (MA).
437
addr = (addr + 7) & -8;
439
/* MMU error, get the MMUSR info for this access */
440
mmusr = probe040(!(ssw & RW_040), addr, ssw);
442
printk("mmusr = %lx\n", mmusr);
445
if (!(mmusr & MMU_R_040)) {
446
/* clear the invalid atc entry */
447
__flush_tlb040_one(addr);
451
/* despite what documentation seems to say, RMW
452
* accesses have always both the LK and RW bits set */
453
if (!(ssw & RW_040) || (ssw & LK_040))
456
if (do_page_fault(&fp->ptregs, addr, errorcode)) {
458
printk("do_page_fault() !=0\n");
460
if (user_mode(&fp->ptregs)){
461
/* delay writebacks after signal delivery */
463
printk(".. was usermode - return\n");
467
/* disable writeback into user space from kernel
468
* (if do_page_fault didn't fix the mapping,
469
* the writeback won't do good)
473
printk(".. disabling wb2\n");
475
if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
476
fp->un.fmt7.wb2s &= ~WBV_040;
477
if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
478
fp->un.fmt7.wb3s &= ~WBV_040;
481
/* In case of a bus error we either kill the process or expect
482
* the kernel to catch the fault, which then is also responsible
483
* for cleaning up the mess.
485
current->thread.signo = SIGBUS;
486
current->thread.faddr = fp->un.fmt7.faddr;
487
if (send_fault_sig(&fp->ptregs) >= 0)
488
printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
493
do_040writebacks(fp);
495
#endif /* CONFIG_M68040 */
497
#if defined(CONFIG_SUN3)
498
#include <asm/sun3mmu.h>
500
extern int mmu_emu_handle_fault (unsigned long, int, int);
502
/* sun3 version of bus_error030 */
504
static inline void bus_error030 (struct frame *fp)
506
unsigned char buserr_type = sun3_get_buserr ();
507
unsigned long addr, errorcode;
508
unsigned short ssw = fp->un.fmtb.ssw;
509
extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
513
printk ("Instruction fault at %#010lx\n",
515
fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
517
fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
519
printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
520
ssw & RW ? "read" : "write",
522
space_names[ssw & DFC], fp->ptregs.pc);
526
* Check if this page should be demand-mapped. This needs to go before
527
* the testing for a bad kernel-space access (demand-mapping applies
528
* to kernel accesses too).
532
&& (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
533
if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
537
/* Check for kernel-space pagefault (BAD). */
538
if (fp->ptregs.sr & PS_S) {
539
/* kernel fault must be a data fault to user space */
540
if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
541
// try checking the kernel mappings before surrender
542
if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
544
/* instruction fault or kernel data fault! */
546
printk ("Instruction fault at %#010lx\n",
549
/* was this fault incurred testing bus mappings? */
550
if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
551
(fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
552
send_fault_sig(&fp->ptregs);
556
printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
557
ssw & RW ? "read" : "write",
559
space_names[ssw & DFC], fp->ptregs.pc);
561
printk ("BAD KERNEL BUSERR\n");
563
die_if_kernel("Oops", &fp->ptregs,0);
564
force_sig(SIGKILL, current);
569
if (!(ssw & (FC | FB)) && !(ssw & DF))
570
/* not an instruction fault or data fault! BAD */
571
panic ("USER BUSERR w/o instruction or data fault");
575
/* First handle the data fault, if any. */
577
addr = fp->un.fmtb.daddr;
579
// errorcode bit 0: 0 -> no page 1 -> protection fault
580
// errorcode bit 1: 0 -> read fault 1 -> write fault
582
// (buserr_type & SUN3_BUSERR_PROTERR) -> protection fault
583
// (buserr_type & SUN3_BUSERR_INVALID) -> invalid page fault
585
if (buserr_type & SUN3_BUSERR_PROTERR)
587
else if (buserr_type & SUN3_BUSERR_INVALID)
591
printk ("*** unexpected busfault type=%#04x\n", buserr_type);
592
printk ("invalid %s access at %#lx from pc %#lx\n",
593
!(ssw & RW) ? "write" : "read", addr,
596
die_if_kernel ("Oops", &fp->ptregs, buserr_type);
597
force_sig (SIGBUS, current);
601
//todo: wtf is RM bit? --m
602
if (!(ssw & RW) || ssw & RM)
605
/* Handle page fault. */
606
do_page_fault (&fp->ptregs, addr, errorcode);
608
/* Retry the data fault now. */
612
/* Now handle the instruction fault. */
614
/* Get the fault address. */
615
if (fp->ptregs.format == 0xA)
616
addr = fp->ptregs.pc + 4;
618
addr = fp->un.fmtb.baddr;
622
if (buserr_type & SUN3_BUSERR_INVALID) {
623
if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
624
do_page_fault (&fp->ptregs, addr, 0);
627
printk ("protection fault on insn access (segv).\n");
629
force_sig (SIGSEGV, current);
633
#if defined(CPU_M68020_OR_M68030)
634
static inline void bus_error030 (struct frame *fp)
636
volatile unsigned short temp;
637
unsigned short mmusr;
638
unsigned long addr, errorcode;
639
unsigned short ssw = fp->un.fmtb.ssw;
643
printk ("pid = %x ", current->pid);
644
printk ("SSW=%#06x ", ssw);
647
printk ("Instruction fault at %#010lx\n",
649
fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
651
fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
653
printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
654
ssw & RW ? "read" : "write",
656
space_names[ssw & DFC], fp->ptregs.pc);
659
/* ++andreas: If a data fault and an instruction fault happen
660
at the same time map in both pages. */
662
/* First handle the data fault, if any. */
664
addr = fp->un.fmtb.daddr;
667
asm volatile ("ptestr %3,%2@,#7,%0\n\t"
670
: "a" (&temp), "a" (addr), "d" (ssw));
672
asm volatile ("ptestr %2,%1@,#7\n\t"
674
: : "a" (&temp), "a" (addr), "d" (ssw));
679
printk("mmusr is %#x for addr %#lx in task %p\n",
680
mmusr, addr, current);
681
printk("descriptor address is %#lx, contents %#lx\n",
682
__va(desc), *(unsigned long *)__va(desc));
685
errorcode = (mmusr & MMU_I) ? 0 : 1;
686
if (!(ssw & RW) || (ssw & RM))
689
if (mmusr & (MMU_I | MMU_WP)) {
691
printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
692
ssw & RW ? "read" : "write",
694
space_names[ssw & DFC], fp->ptregs.pc);
697
/* Don't try to do anything further if an exception was
699
if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
701
} else if (!(mmusr & MMU_I)) {
702
/* probably a 020 cas fault */
703
if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
704
printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
705
} else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
706
printk("invalid %s access at %#lx from pc %#lx\n",
707
!(ssw & RW) ? "write" : "read", addr,
709
die_if_kernel("Oops",&fp->ptregs,mmusr);
710
force_sig(SIGSEGV, current);
714
static volatile long tlong;
717
printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
718
!(ssw & RW) ? "write" : "read", addr,
720
asm volatile ("ptestr #1,%1@,#0\n\t"
723
: "a" (&temp), "a" (addr));
726
printk ("level 0 mmusr is %#x\n", mmusr);
728
asm volatile ("pmove %%tt0,%0@"
731
printk("tt0 is %#lx, ", tlong);
732
asm volatile ("pmove %%tt1,%0@"
735
printk("tt1 is %#lx\n", tlong);
738
printk("Unknown SIGSEGV - 1\n");
740
die_if_kernel("Oops",&fp->ptregs,mmusr);
741
force_sig(SIGSEGV, current);
745
/* setup an ATC entry for the access about to be retried */
746
if (!(ssw & RW) || (ssw & RM))
747
asm volatile ("ploadw %1,%0@" : /* no outputs */
748
: "a" (addr), "d" (ssw));
750
asm volatile ("ploadr %1,%0@" : /* no outputs */
751
: "a" (addr), "d" (ssw));
754
/* Now handle the instruction fault. */
756
if (!(ssw & (FC|FB)))
759
if (fp->ptregs.sr & PS_S) {
760
printk("Instruction fault at %#010lx\n",
763
printk ("BAD KERNEL BUSERR\n");
764
die_if_kernel("Oops",&fp->ptregs,0);
765
force_sig(SIGKILL, current);
769
/* get the fault address */
770
if (fp->ptregs.format == 10)
771
addr = fp->ptregs.pc + 4;
773
addr = fp->un.fmtb.baddr;
777
if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
778
/* Insn fault on same page as data fault. But we
779
should still create the ATC entry. */
780
goto create_atc_entry;
783
asm volatile ("ptestr #1,%2@,#7,%0\n\t"
786
: "a" (&temp), "a" (addr));
788
asm volatile ("ptestr #1,%1@,#7\n\t"
790
: : "a" (&temp), "a" (addr));
795
printk ("mmusr is %#x for addr %#lx in task %p\n",
796
mmusr, addr, current);
797
printk ("descriptor address is %#lx, contents %#lx\n",
798
__va(desc), *(unsigned long *)__va(desc));
802
do_page_fault (&fp->ptregs, addr, 0);
803
else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
804
printk ("invalid insn access at %#lx from pc %#lx\n",
805
addr, fp->ptregs.pc);
807
printk("Unknown SIGSEGV - 2\n");
809
die_if_kernel("Oops",&fp->ptregs,mmusr);
810
force_sig(SIGSEGV, current);
815
/* setup an ATC entry for the access about to be retried */
816
asm volatile ("ploadr #2,%0@" : /* no outputs */
819
#endif /* CPU_M68020_OR_M68030 */
820
#endif /* !CONFIG_SUN3 */
822
asmlinkage void buserr_c(struct frame *fp)
824
/* Only set esp0 if coming from user mode */
825
if (user_mode(&fp->ptregs))
826
current->thread.esp0 = (unsigned long) fp;
829
printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
832
switch (fp->ptregs.format) {
833
#if defined (CONFIG_M68060)
834
case 4: /* 68060 access error */
835
access_error060 (fp);
838
#if defined (CONFIG_M68040)
839
case 0x7: /* 68040 access error */
840
access_error040 (fp);
843
#if defined (CPU_M68020_OR_M68030)
850
die_if_kernel("bad frame format",&fp->ptregs,0);
852
printk("Unknown SIGSEGV - 4\n");
854
force_sig(SIGSEGV, current);
859
static int kstack_depth_to_print = 48;
861
void show_trace(unsigned long *stack)
863
unsigned long *endstack;
867
printk("Call Trace:");
868
addr = (unsigned long)stack + THREAD_SIZE - 1;
869
endstack = (unsigned long *)(addr & -THREAD_SIZE);
871
while (stack + 1 <= endstack) {
874
* If the address is either in the text segment of the
875
* kernel, or in the region which contains vmalloc'ed
876
* memory, it *may* be the address of a calling
877
* routine; if so, print it so that someone tracing
878
* down the cause of the crash will be able to figure
879
* out the call path that was taken.
881
if (__kernel_text_address(addr)) {
882
#ifndef CONFIG_KALLSYMS
886
printk(" [<%08lx>] %pS\n", addr, (void *)addr);
893
void show_registers(struct pt_regs *regs)
895
struct frame *fp = (struct frame *)regs;
896
mm_segment_t old_fs = get_fs();
902
printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
903
printk("SR: %04x SP: %p a2: %08lx\n", regs->sr, regs, regs->a2);
904
printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
905
regs->d0, regs->d1, regs->d2, regs->d3);
906
printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
907
regs->d4, regs->d5, regs->a0, regs->a1);
909
printk("Process %s (pid: %d, task=%p)\n",
910
current->comm, task_pid_nr(current), current);
911
addr = (unsigned long)&fp->un;
912
printk("Frame format=%X ", regs->format);
913
switch (regs->format) {
915
printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
916
addr += sizeof(fp->un.fmt2);
919
printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
920
addr += sizeof(fp->un.fmt3);
923
printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
924
: "eff addr=%08lx pc=%08lx\n"),
925
fp->un.fmt4.effaddr, fp->un.fmt4.pc);
926
addr += sizeof(fp->un.fmt4);
929
printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
930
fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
931
printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
932
fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
933
printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
934
fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
935
printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
936
fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
937
printk("push data: %08lx %08lx %08lx %08lx\n",
938
fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
940
addr += sizeof(fp->un.fmt7);
943
printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
944
addr += sizeof(fp->un.fmt9);
947
printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
948
fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
949
fp->un.fmta.daddr, fp->un.fmta.dobuf);
950
addr += sizeof(fp->un.fmta);
953
printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
954
fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
955
fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
956
printk("baddr=%08lx dibuf=%08lx ver=%x\n",
957
fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
958
addr += sizeof(fp->un.fmtb);
963
show_stack(NULL, (unsigned long *)addr);
967
cp = (u16 *)regs->pc;
968
for (i = -8; i < 16; i++) {
969
if (get_user(c, cp + i) && i >= 0) {
970
printk(" Bad PC value.");
973
printk(i ? " %04x" : " <%04x>", c);
979
void show_stack(struct task_struct *task, unsigned long *stack)
982
unsigned long *endstack;
987
stack = (unsigned long *)task->thread.esp0;
989
stack = (unsigned long *)&stack;
991
endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
993
printk("Stack from %08lx:", (unsigned long)stack);
995
for (i = 0; i < kstack_depth_to_print; i++) {
996
if (p + 1 > endstack)
1000
printk(" %08lx", *p++);
1007
* The architecture-independent backtrace generator
1009
void dump_stack(void)
1011
unsigned long stack;
1016
EXPORT_SYMBOL(dump_stack);
1018
void bad_super_trap (struct frame *fp)
1021
if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
1022
printk ("*** %s *** FORMAT=%X\n",
1023
vec_names[(fp->ptregs.vector) >> 2],
1026
printk ("*** Exception %d *** FORMAT=%X\n",
1027
(fp->ptregs.vector) >> 2,
1029
if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
1030
unsigned short ssw = fp->un.fmtb.ssw;
1032
printk ("SSW=%#06x ", ssw);
1035
printk ("Pipe stage C instruction fault at %#010lx\n",
1036
(fp->ptregs.format) == 0xA ?
1037
fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
1039
printk ("Pipe stage B instruction fault at %#010lx\n",
1040
(fp->ptregs.format) == 0xA ?
1041
fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
1043
printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
1044
ssw & RW ? "read" : "write",
1045
fp->un.fmtb.daddr, space_names[ssw & DFC],
1048
printk ("Current process id is %d\n", task_pid_nr(current));
1049
die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
1052
asmlinkage void trap_c(struct frame *fp)
1057
if (fp->ptregs.sr & PS_S) {
1058
if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
1059
/* traced a trapping instruction */
1065
/* send the appropriate signal to the user program */
1066
switch ((fp->ptregs.vector) >> 2) {
1068
info.si_code = BUS_ADRALN;
1074
info.si_code = ILL_ILLOPC;
1078
info.si_code = ILL_PRVOPC;
1082
info.si_code = ILL_COPROC;
1099
info.si_code = ILL_ILLTRP;
1105
info.si_code = FPE_FLTINV;
1109
info.si_code = FPE_FLTRES;
1113
info.si_code = FPE_FLTDIV;
1117
info.si_code = FPE_FLTUND;
1121
info.si_code = FPE_FLTOVF;
1125
info.si_code = FPE_INTDIV;
1130
info.si_code = FPE_INTOVF;
1133
case VEC_TRACE: /* ptrace single step */
1134
info.si_code = TRAP_TRACE;
1137
case VEC_TRAP15: /* breakpoint */
1138
info.si_code = TRAP_BRKPT;
1142
info.si_code = ILL_ILLOPC;
1146
info.si_signo = sig;
1148
switch (fp->ptregs.format) {
1150
info.si_addr = (void *) fp->ptregs.pc;
1153
info.si_addr = (void *) fp->un.fmt2.iaddr;
1156
info.si_addr = (void *) fp->un.fmt7.effaddr;
1159
info.si_addr = (void *) fp->un.fmt9.iaddr;
1162
info.si_addr = (void *) fp->un.fmta.daddr;
1165
info.si_addr = (void *) fp->un.fmtb.daddr;
1168
force_sig_info (sig, &info, current);
1171
void die_if_kernel (char *str, struct pt_regs *fp, int nr)
1173
if (!(fp->sr & PS_S))
1177
printk("%s: %08x\n",str,nr);
1179
add_taint(TAINT_DIE);
1184
* This function is called if an error occur while accessing
1185
* user-space from the fpsp040 code.
1187
asmlinkage void fpsp040_die(void)
1192
#ifdef CONFIG_M68KFPU_EMU
1193
asmlinkage void fpemu_signal(int signal, int code, void *addr)
1197
info.si_signo = signal;
1199
info.si_code = code;
1200
info.si_addr = addr;
1201
force_sig_info(signal, &info, current);