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12#include <linux/sched.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/errno.h>
16#include <linux/ptrace.h>
17#include <linux/timer.h>
18#include <linux/mm.h>
19#include <linux/smp.h>
20#include <linux/init.h>
21#include <linux/delay.h>
22#include <linux/spinlock.h>
23#include <linux/interrupt.h>
24#include <linux/kallsyms.h>
25#include <linux/pci.h>
26#include <linux/kdebug.h>
27#include <linux/bug.h>
28#include <linux/irq.h>
29#include <linux/export.h>
30#include <asm/processor.h>
31#include <linux/uaccess.h>
32#include <asm/io.h>
33#include <linux/atomic.h>
34#include <asm/smp.h>
35#include <asm/pgalloc.h>
36#include <asm/cacheflush.h>
37#include <asm/cpu-regs.h>
38#include <asm/busctl-regs.h>
39#include <unit/leds.h>
40#include <asm/fpu.h>
41#include <asm/sections.h>
42#include <asm/debugger.h>
43#include "internal.h"
44
45#if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
46#error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
47#endif
48
49int kstack_depth_to_print = 24;
50
51spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);
52
53struct exception_to_signal_map {
54 u8 signo;
55 u32 si_code;
56};
57
58static const struct exception_to_signal_map exception_to_signal_map[256] = {
59
60 [EXCEP_ITLBMISS >> 3] = { 0, 0 },
61 [EXCEP_DTLBMISS >> 3] = { 0, 0 },
62 [EXCEP_IAERROR >> 3] = { 0, 0 },
63 [EXCEP_DAERROR >> 3] = { 0, 0 },
64
65
66 [EXCEP_TRAP >> 3] = { SIGTRAP, TRAP_BRKPT },
67 [EXCEP_ISTEP >> 3] = { SIGTRAP, TRAP_TRACE },
68 [EXCEP_IBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT },
69 [EXCEP_OBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT },
70 [EXCEP_PRIVINS >> 3] = { SIGILL, ILL_PRVOPC },
71 [EXCEP_UNIMPINS >> 3] = { SIGILL, ILL_ILLOPC },
72 [EXCEP_UNIMPEXINS >> 3] = { SIGILL, ILL_ILLOPC },
73 [EXCEP_MEMERR >> 3] = { SIGSEGV, SEGV_ACCERR },
74 [EXCEP_MISALIGN >> 3] = { SIGBUS, BUS_ADRALN },
75 [EXCEP_BUSERROR >> 3] = { SIGBUS, BUS_ADRERR },
76 [EXCEP_ILLINSACC >> 3] = { SIGSEGV, SEGV_ACCERR },
77 [EXCEP_ILLDATACC >> 3] = { SIGSEGV, SEGV_ACCERR },
78 [EXCEP_IOINSACC >> 3] = { SIGSEGV, SEGV_ACCERR },
79 [EXCEP_PRIVINSACC >> 3] = { SIGSEGV, SEGV_ACCERR },
80 [EXCEP_PRIVDATACC >> 3] = { SIGSEGV, SEGV_ACCERR },
81 [EXCEP_DATINSACC >> 3] = { SIGSEGV, SEGV_ACCERR },
82 [EXCEP_DOUBLE_FAULT >> 3] = { SIGILL, ILL_BADSTK },
83
84
85 [EXCEP_FPU_DISABLED >> 3] = { SIGILL, ILL_COPROC },
86 [EXCEP_FPU_UNIMPINS >> 3] = { SIGILL, ILL_COPROC },
87 [EXCEP_FPU_OPERATION >> 3] = { SIGFPE, FPE_INTDIV },
88
89
90 [EXCEP_WDT >> 3] = { SIGALRM, 0 },
91 [EXCEP_NMI >> 3] = { SIGQUIT, 0 },
92 [EXCEP_IRQ_LEVEL0 >> 3] = { SIGINT, 0 },
93 [EXCEP_IRQ_LEVEL1 >> 3] = { 0, 0 },
94 [EXCEP_IRQ_LEVEL2 >> 3] = { 0, 0 },
95 [EXCEP_IRQ_LEVEL3 >> 3] = { 0, 0 },
96 [EXCEP_IRQ_LEVEL4 >> 3] = { 0, 0 },
97 [EXCEP_IRQ_LEVEL5 >> 3] = { 0, 0 },
98 [EXCEP_IRQ_LEVEL6 >> 3] = { 0, 0 },
99
100
101 [EXCEP_SYSCALL0 >> 3] = { 0, 0 },
102 [EXCEP_SYSCALL1 >> 3] = { SIGILL, ILL_ILLTRP },
103 [EXCEP_SYSCALL2 >> 3] = { SIGILL, ILL_ILLTRP },
104 [EXCEP_SYSCALL3 >> 3] = { SIGILL, ILL_ILLTRP },
105 [EXCEP_SYSCALL4 >> 3] = { SIGILL, ILL_ILLTRP },
106 [EXCEP_SYSCALL5 >> 3] = { SIGILL, ILL_ILLTRP },
107 [EXCEP_SYSCALL6 >> 3] = { SIGILL, ILL_ILLTRP },
108 [EXCEP_SYSCALL7 >> 3] = { SIGILL, ILL_ILLTRP },
109 [EXCEP_SYSCALL8 >> 3] = { SIGILL, ILL_ILLTRP },
110 [EXCEP_SYSCALL9 >> 3] = { SIGILL, ILL_ILLTRP },
111 [EXCEP_SYSCALL10 >> 3] = { SIGILL, ILL_ILLTRP },
112 [EXCEP_SYSCALL11 >> 3] = { SIGILL, ILL_ILLTRP },
113 [EXCEP_SYSCALL12 >> 3] = { SIGILL, ILL_ILLTRP },
114 [EXCEP_SYSCALL13 >> 3] = { SIGILL, ILL_ILLTRP },
115 [EXCEP_SYSCALL14 >> 3] = { SIGILL, ILL_ILLTRP },
116 [EXCEP_SYSCALL15 >> 3] = { SIGABRT, 0 },
117};
118
119
120
121
122
123
124
125int die_if_no_fixup(const char *str, struct pt_regs *regs,
126 enum exception_code code)
127{
128 u8 opcode;
129 int signo, si_code;
130
131 if (user_mode(regs))
132 return 0;
133
134 peripheral_leds_display_exception(code);
135
136 signo = exception_to_signal_map[code >> 3].signo;
137 si_code = exception_to_signal_map[code >> 3].si_code;
138
139 switch (code) {
140
141 case EXCEP_ITLBMISS:
142 case EXCEP_DTLBMISS:
143 case EXCEP_IAERROR:
144 case EXCEP_DAERROR:
145 case EXCEP_MEMERR:
146 case EXCEP_MISALIGN:
147 case EXCEP_BUSERROR:
148 case EXCEP_ILLDATACC:
149 case EXCEP_IOINSACC:
150 case EXCEP_PRIVINSACC:
151 case EXCEP_PRIVDATACC:
152 case EXCEP_DATINSACC:
153 if (fixup_exception(regs))
154 return 1;
155 break;
156
157 case EXCEP_TRAP:
158 case EXCEP_UNIMPINS:
159 if (probe_kernel_read(&opcode, (u8 *)regs->pc, 1) < 0)
160 break;
161 if (opcode == 0xff) {
162 if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0))
163 return 1;
164 if (at_debugger_breakpoint(regs))
165 regs->pc++;
166 signo = SIGTRAP;
167 si_code = TRAP_BRKPT;
168 }
169 break;
170
171 case EXCEP_SYSCALL1 ... EXCEP_SYSCALL14:
172
173 regs->pc -= 2;
174 break;
175
176 case EXCEP_SYSCALL15:
177 if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_WARN)
178 return 1;
179
180
181 regs->pc -= 2;
182 break;
183
184 default:
185 break;
186 }
187
188 if (debugger_intercept(code, signo, si_code, regs) == 0)
189 return 1;
190
191 if (notify_die(DIE_GPF, str, regs, code, 0, 0))
192 return 1;
193
194
195 die(str, regs, code);
196}
197
198
199
200
201asmlinkage void handle_exception(struct pt_regs *regs, u32 intcode)
202{
203 siginfo_t info;
204
205
206 if (die_if_no_fixup(NULL, regs, intcode))
207 return;
208
209
210 info.si_signo = exception_to_signal_map[intcode >> 3].signo;
211 info.si_code = exception_to_signal_map[intcode >> 3].si_code;
212 info.si_errno = 0;
213 info.si_addr = (void *) regs->pc;
214 force_sig_info(info.si_signo, &info, current);
215}
216
217
218
219
220asmlinkage void nmi(struct pt_regs *regs, enum exception_code code)
221{
222
223 if (debugger_intercept(code, SIGQUIT, 0, regs))
224 return;
225
226 printk(KERN_WARNING "--- Register Dump ---\n");
227 show_registers(regs);
228 printk(KERN_WARNING "---------------------\n");
229}
230
231
232
233
234void show_trace(unsigned long *sp)
235{
236 unsigned long bottom, stack, addr, fp, raslot;
237
238 printk(KERN_EMERG "\nCall Trace:\n");
239
240
241 asm("mov sp,%0" : "=a"(stack));
242 asm("mov a3,%0" : "=r"(fp));
243
244 raslot = ULONG_MAX;
245 bottom = (stack + THREAD_SIZE) & ~(THREAD_SIZE - 1);
246 for (; stack < bottom; stack += sizeof(addr)) {
247 addr = *(unsigned long *)stack;
248 if (stack == fp) {
249 if (addr > stack && addr < bottom) {
250 fp = addr;
251 raslot = stack + sizeof(addr);
252 continue;
253 }
254 fp = 0;
255 raslot = ULONG_MAX;
256 }
257
258 if (__kernel_text_address(addr)) {
259 printk(" [<%08lx>]", addr);
260 if (stack >= raslot)
261 raslot = ULONG_MAX;
262 else
263 printk(" ?");
264 print_symbol(" %s", addr);
265 printk("\n");
266 }
267 }
268
269 printk("\n");
270}
271
272
273
274
275void show_stack(struct task_struct *task, unsigned long *sp)
276{
277 unsigned long *stack;
278 int i;
279
280 if (!sp)
281 sp = (unsigned long *) &sp;
282
283 stack = sp;
284 printk(KERN_EMERG "Stack:");
285 for (i = 0; i < kstack_depth_to_print; i++) {
286 if (((long) stack & (THREAD_SIZE - 1)) == 0)
287 break;
288 if ((i % 8) == 0)
289 printk(KERN_EMERG " ");
290 printk("%08lx ", *stack++);
291 }
292
293 show_trace(sp);
294}
295
296
297
298
299void show_registers_only(struct pt_regs *regs)
300{
301 unsigned long ssp;
302
303 ssp = (unsigned long) regs + sizeof(*regs);
304
305 printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n",
306 regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
307 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
308 regs->d0, regs->d1, regs->d2, regs->d3);
309 printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n",
310 regs->a0, regs->a1, regs->a2, regs->a3);
311 printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n",
312 regs->e0, regs->e1, regs->e2, regs->e3);
313 printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n",
314 regs->e4, regs->e5, regs->e6, regs->e7);
315 printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n",
316 regs->lar, regs->lir, regs->mdr, regs->sp);
317 printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n",
318 regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
319 printk(KERN_EMERG "threadinfo=%p task=%p)\n",
320 current_thread_info(), current);
321
322 if ((unsigned long) current >= PAGE_OFFSET &&
323 (unsigned long) current < (unsigned long)high_memory)
324 printk(KERN_EMERG "Process %s (pid: %d)\n",
325 current->comm, current->pid);
326
327#ifdef CONFIG_SMP
328 printk(KERN_EMERG "CPUID: %08x\n", CPUID);
329#endif
330 printk(KERN_EMERG "CPUP: %04hx\n", CPUP);
331 printk(KERN_EMERG "TBR: %08x\n", TBR);
332 printk(KERN_EMERG "DEAR: %08x\n", DEAR);
333 printk(KERN_EMERG "sISR: %08x\n", sISR);
334 printk(KERN_EMERG "NMICR: %04hx\n", NMICR);
335 printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
336 printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
337 printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
338 printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2);
339 printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2);
340}
341
342
343
344
345void show_registers(struct pt_regs *regs)
346{
347 unsigned long sp;
348 int i;
349
350 show_registers_only(regs);
351
352 if (!user_mode(regs))
353 sp = (unsigned long) regs + sizeof(*regs);
354 else
355 sp = regs->sp;
356
357
358
359
360 if (!user_mode(regs)) {
361 printk(KERN_EMERG "\n");
362 show_stack(current, (unsigned long *) sp);
363
364#if 0
365 printk(KERN_EMERG "\nCode: ");
366 if (regs->pc < PAGE_OFFSET)
367 goto bad;
368
369 for (i = 0; i < 20; i++) {
370 unsigned char c;
371 if (__get_user(c, &((unsigned char *) regs->pc)[i]))
372 goto bad;
373 printk("%02x ", c);
374 }
375#else
376 i = 0;
377#endif
378 }
379
380 printk("\n");
381 return;
382
383#if 0
384bad:
385 printk(KERN_EMERG " Bad PC value.");
386 break;
387#endif
388}
389
390
391
392
393void show_trace_task(struct task_struct *tsk)
394{
395 unsigned long sp = tsk->thread.sp;
396
397
398 if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
399 return;
400
401 show_trace((unsigned long *) sp);
402}
403
404
405
406
407void die(const char *str, struct pt_regs *regs, enum exception_code code)
408{
409 console_verbose();
410 spin_lock_irq(&die_lock);
411 printk(KERN_EMERG "\n%s: %04x\n",
412 str, code & 0xffff);
413 show_registers(regs);
414
415 if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
416 (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
417 printk(KERN_EMERG "Exception in usermode interrupt handler\n");
418 printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n");
419 asm volatile ("0: bra 0b");
420 }
421
422 spin_unlock_irq(&die_lock);
423 do_exit(SIGSEGV);
424}
425
426
427
428
429asmlinkage void do_double_fault(struct pt_regs *regs)
430{
431 struct task_struct *tsk = current;
432
433 strcpy(tsk->comm, "emergency tsk");
434 tsk->pid = 0;
435 console_verbose();
436 printk(KERN_EMERG "--- double fault ---\n");
437 show_registers(regs);
438}
439
440
441
442
443asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
444{
445 console_verbose();
446
447 printk(KERN_EMERG "Asynchronous I/O Bus Error\n");
448 printk(KERN_EMERG "==========================\n");
449
450 if (bcberr & BCBERR_BEME)
451 printk(KERN_EMERG "- Multiple recorded errors\n");
452
453 printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
454 bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "",
455 bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "",
456 bcberr & BCBERR_BEMR_DMA ? " DMA" : "");
457
458 printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
459 bcberr & BCBERR_BEBST ? "Burst" : "Single",
460 bcberr & BCBERR_BERW ? "Read" : "Write",
461 bcberr & BCBERR_BESB_MON ? "Monitor Space" :
462 bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" :
463 bcberr & BCBERR_BESB_EX ? "External I/O Bus" :
464 bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" :
465 "On Chip Memory",
466 bcbear
467 );
468
469 printk(KERN_EMERG "- Detected by the %s\n",
470 bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");
471
472#ifdef CONFIG_PCI
473#define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X)))
474#define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
475#define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))
476
477 printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n",
478 *(volatile __u32 *) (0xBFFFFFF4));
479 printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n",
480 BRIDGEREGL(PCI_BASE_ADDRESS_0));
481 printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
482 BRIDGEREGL(0x48));
483 printk(KERN_EMERG "- PCI Bridge Command: %04hx\n",
484 BRIDGEREGW(PCI_COMMAND));
485 printk(KERN_EMERG "- PCI Bridge Status: %04hx\n",
486 BRIDGEREGW(PCI_STATUS));
487 printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n",
488 BRIDGEREGL(0x4c));
489#endif
490
491 printk(KERN_EMERG "\n");
492 show_registers(regs);
493
494 panic("Halted due to asynchronous I/O Bus Error\n");
495}
496
497
498
499
500asmlinkage void uninitialised_exception(struct pt_regs *regs,
501 enum exception_code code)
502{
503
504
505 if (debugger_intercept(code, SIGSYS, 0, regs) == 0)
506 return;
507
508 peripheral_leds_display_exception(code);
509 printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
510 show_registers(regs);
511
512 for (;;)
513 continue;
514}
515
516
517
518
519
520void __init __set_intr_stub(enum exception_code code, void *handler)
521{
522 unsigned long addr;
523 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
524
525 addr = (unsigned long) handler - (unsigned long) vector;
526 vector[0] = 0xdc;
527 vector[1] = addr;
528 vector[2] = addr >> 8;
529 vector[3] = addr >> 16;
530 vector[4] = addr >> 24;
531 vector[5] = 0xcb;
532 vector[6] = 0xcb;
533 vector[7] = 0xcb;
534}
535
536
537
538
539void __init set_intr_stub(enum exception_code code, void *handler)
540{
541 unsigned long addr;
542 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
543 unsigned long flags;
544
545 addr = (unsigned long) handler - (unsigned long) vector;
546
547 flags = arch_local_cli_save();
548
549 vector[0] = 0xdc;
550 vector[1] = addr;
551 vector[2] = addr >> 8;
552 vector[3] = addr >> 16;
553 vector[4] = addr >> 24;
554 vector[5] = 0xcb;
555 vector[6] = 0xcb;
556 vector[7] = 0xcb;
557
558 arch_local_irq_restore(flags);
559
560#ifndef CONFIG_MN10300_CACHE_SNOOP
561 mn10300_dcache_flush_inv();
562 mn10300_icache_inv();
563#endif
564}
565
566
567
568
569void __init trap_init(void)
570{
571 set_excp_vector(EXCEP_TRAP, handle_exception);
572 set_excp_vector(EXCEP_ISTEP, handle_exception);
573 set_excp_vector(EXCEP_IBREAK, handle_exception);
574 set_excp_vector(EXCEP_OBREAK, handle_exception);
575
576 set_excp_vector(EXCEP_PRIVINS, handle_exception);
577 set_excp_vector(EXCEP_UNIMPINS, handle_exception);
578 set_excp_vector(EXCEP_UNIMPEXINS, handle_exception);
579 set_excp_vector(EXCEP_MEMERR, handle_exception);
580 set_excp_vector(EXCEP_MISALIGN, misalignment);
581 set_excp_vector(EXCEP_BUSERROR, handle_exception);
582 set_excp_vector(EXCEP_ILLINSACC, handle_exception);
583 set_excp_vector(EXCEP_ILLDATACC, handle_exception);
584 set_excp_vector(EXCEP_IOINSACC, handle_exception);
585 set_excp_vector(EXCEP_PRIVINSACC, handle_exception);
586 set_excp_vector(EXCEP_PRIVDATACC, handle_exception);
587 set_excp_vector(EXCEP_DATINSACC, handle_exception);
588 set_excp_vector(EXCEP_FPU_UNIMPINS, handle_exception);
589 set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception);
590
591 set_excp_vector(EXCEP_NMI, nmi);
592
593 set_excp_vector(EXCEP_SYSCALL1, handle_exception);
594 set_excp_vector(EXCEP_SYSCALL2, handle_exception);
595 set_excp_vector(EXCEP_SYSCALL3, handle_exception);
596 set_excp_vector(EXCEP_SYSCALL4, handle_exception);
597 set_excp_vector(EXCEP_SYSCALL5, handle_exception);
598 set_excp_vector(EXCEP_SYSCALL6, handle_exception);
599 set_excp_vector(EXCEP_SYSCALL7, handle_exception);
600 set_excp_vector(EXCEP_SYSCALL8, handle_exception);
601 set_excp_vector(EXCEP_SYSCALL9, handle_exception);
602 set_excp_vector(EXCEP_SYSCALL10, handle_exception);
603 set_excp_vector(EXCEP_SYSCALL11, handle_exception);
604 set_excp_vector(EXCEP_SYSCALL12, handle_exception);
605 set_excp_vector(EXCEP_SYSCALL13, handle_exception);
606 set_excp_vector(EXCEP_SYSCALL14, handle_exception);
607 set_excp_vector(EXCEP_SYSCALL15, handle_exception);
608}
609
610
611
612
613int is_valid_bugaddr(unsigned long pc)
614{
615 return pc >= PAGE_OFFSET;
616}
617
