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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 <asm/processor.h>
30#include <asm/system.h>
31#include <asm/uaccess.h>
32#include <asm/io.h>
33#include <asm/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 (get_user(opcode, (uint8_t __user *)regs->pc) != 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 dump_stack(void)
300{
301 unsigned long stack;
302
303 show_stack(current, &stack);
304}
305EXPORT_SYMBOL(dump_stack);
306
307
308
309
310void show_registers_only(struct pt_regs *regs)
311{
312 unsigned long ssp;
313
314 ssp = (unsigned long) regs + sizeof(*regs);
315
316 printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n",
317 regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
318 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
319 regs->d0, regs->d1, regs->d2, regs->d3);
320 printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n",
321 regs->a0, regs->a1, regs->a2, regs->a3);
322 printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n",
323 regs->e0, regs->e1, regs->e2, regs->e3);
324 printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n",
325 regs->e4, regs->e5, regs->e6, regs->e7);
326 printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n",
327 regs->lar, regs->lir, regs->mdr, regs->sp);
328 printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n",
329 regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
330 printk(KERN_EMERG "threadinfo=%p task=%p)\n",
331 current_thread_info(), current);
332
333 if ((unsigned long) current >= PAGE_OFFSET &&
334 (unsigned long) current < (unsigned long)high_memory)
335 printk(KERN_EMERG "Process %s (pid: %d)\n",
336 current->comm, current->pid);
337
338#ifdef CONFIG_SMP
339 printk(KERN_EMERG "CPUID: %08x\n", CPUID);
340#endif
341 printk(KERN_EMERG "CPUP: %04hx\n", CPUP);
342 printk(KERN_EMERG "TBR: %08x\n", TBR);
343 printk(KERN_EMERG "DEAR: %08x\n", DEAR);
344 printk(KERN_EMERG "sISR: %08x\n", sISR);
345 printk(KERN_EMERG "NMICR: %04hx\n", NMICR);
346 printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
347 printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
348 printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
349 printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2);
350 printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2);
351}
352
353
354
355
356void show_registers(struct pt_regs *regs)
357{
358 unsigned long sp;
359 int i;
360
361 show_registers_only(regs);
362
363 if (!user_mode(regs))
364 sp = (unsigned long) regs + sizeof(*regs);
365 else
366 sp = regs->sp;
367
368
369
370
371 if (!user_mode(regs)) {
372 printk(KERN_EMERG "\n");
373 show_stack(current, (unsigned long *) sp);
374
375#if 0
376 printk(KERN_EMERG "\nCode: ");
377 if (regs->pc < PAGE_OFFSET)
378 goto bad;
379
380 for (i = 0; i < 20; i++) {
381 unsigned char c;
382 if (__get_user(c, &((unsigned char *) regs->pc)[i]))
383 goto bad;
384 printk("%02x ", c);
385 }
386#else
387 i = 0;
388#endif
389 }
390
391 printk("\n");
392 return;
393
394#if 0
395bad:
396 printk(KERN_EMERG " Bad PC value.");
397 break;
398#endif
399}
400
401
402
403
404void show_trace_task(struct task_struct *tsk)
405{
406 unsigned long sp = tsk->thread.sp;
407
408
409 if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
410 return;
411
412 show_trace((unsigned long *) sp);
413}
414
415
416
417
418void die(const char *str, struct pt_regs *regs, enum exception_code code)
419{
420 console_verbose();
421 spin_lock_irq(&die_lock);
422 printk(KERN_EMERG "\n%s: %04x\n",
423 str, code & 0xffff);
424 show_registers(regs);
425
426 if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
427 (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
428 printk(KERN_EMERG "Exception in usermode interrupt handler\n");
429 printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n");
430 asm volatile ("0: bra 0b");
431 }
432
433 spin_unlock_irq(&die_lock);
434 do_exit(SIGSEGV);
435}
436
437
438
439
440asmlinkage void do_double_fault(struct pt_regs *regs)
441{
442 struct task_struct *tsk = current;
443
444 strcpy(tsk->comm, "emergency tsk");
445 tsk->pid = 0;
446 console_verbose();
447 printk(KERN_EMERG "--- double fault ---\n");
448 show_registers(regs);
449}
450
451
452
453
454asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
455{
456 console_verbose();
457
458 printk(KERN_EMERG "Asynchronous I/O Bus Error\n");
459 printk(KERN_EMERG "==========================\n");
460
461 if (bcberr & BCBERR_BEME)
462 printk(KERN_EMERG "- Multiple recorded errors\n");
463
464 printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
465 bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "",
466 bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "",
467 bcberr & BCBERR_BEMR_DMA ? " DMA" : "");
468
469 printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
470 bcberr & BCBERR_BEBST ? "Burst" : "Single",
471 bcberr & BCBERR_BERW ? "Read" : "Write",
472 bcberr & BCBERR_BESB_MON ? "Monitor Space" :
473 bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" :
474 bcberr & BCBERR_BESB_EX ? "External I/O Bus" :
475 bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" :
476 "On Chip Memory",
477 bcbear
478 );
479
480 printk(KERN_EMERG "- Detected by the %s\n",
481 bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");
482
483#ifdef CONFIG_PCI
484#define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X)))
485#define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
486#define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))
487
488 printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n",
489 *(volatile __u32 *) (0xBFFFFFF4));
490 printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n",
491 BRIDGEREGL(PCI_BASE_ADDRESS_0));
492 printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
493 BRIDGEREGL(0x48));
494 printk(KERN_EMERG "- PCI Bridge Command: %04hx\n",
495 BRIDGEREGW(PCI_COMMAND));
496 printk(KERN_EMERG "- PCI Bridge Status: %04hx\n",
497 BRIDGEREGW(PCI_STATUS));
498 printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n",
499 BRIDGEREGL(0x4c));
500#endif
501
502 printk(KERN_EMERG "\n");
503 show_registers(regs);
504
505 panic("Halted due to asynchronous I/O Bus Error\n");
506}
507
508
509
510
511asmlinkage void uninitialised_exception(struct pt_regs *regs,
512 enum exception_code code)
513{
514
515
516 if (debugger_intercept(code, SIGSYS, 0, regs) == 0)
517 return;
518
519 peripheral_leds_display_exception(code);
520 printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
521 show_registers(regs);
522
523 for (;;)
524 continue;
525}
526
527
528
529
530
531void __init __set_intr_stub(enum exception_code code, void *handler)
532{
533 unsigned long addr;
534 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
535
536 addr = (unsigned long) handler - (unsigned long) vector;
537 vector[0] = 0xdc;
538 vector[1] = addr;
539 vector[2] = addr >> 8;
540 vector[3] = addr >> 16;
541 vector[4] = addr >> 24;
542 vector[5] = 0xcb;
543 vector[6] = 0xcb;
544 vector[7] = 0xcb;
545}
546
547
548
549
550void __init set_intr_stub(enum exception_code code, void *handler)
551{
552 unsigned long addr;
553 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
554 unsigned long flags;
555
556 addr = (unsigned long) handler - (unsigned long) vector;
557
558 flags = arch_local_cli_save();
559
560 vector[0] = 0xdc;
561 vector[1] = addr;
562 vector[2] = addr >> 8;
563 vector[3] = addr >> 16;
564 vector[4] = addr >> 24;
565 vector[5] = 0xcb;
566 vector[6] = 0xcb;
567 vector[7] = 0xcb;
568
569 arch_local_irq_restore(flags);
570
571#ifndef CONFIG_MN10300_CACHE_SNOOP
572 mn10300_dcache_flush_inv();
573 mn10300_icache_inv();
574#endif
575}
576
577
578
579
580void __init trap_init(void)
581{
582 set_excp_vector(EXCEP_TRAP, handle_exception);
583 set_excp_vector(EXCEP_ISTEP, handle_exception);
584 set_excp_vector(EXCEP_IBREAK, handle_exception);
585 set_excp_vector(EXCEP_OBREAK, handle_exception);
586
587 set_excp_vector(EXCEP_PRIVINS, handle_exception);
588 set_excp_vector(EXCEP_UNIMPINS, handle_exception);
589 set_excp_vector(EXCEP_UNIMPEXINS, handle_exception);
590 set_excp_vector(EXCEP_MEMERR, handle_exception);
591 set_excp_vector(EXCEP_MISALIGN, misalignment);
592 set_excp_vector(EXCEP_BUSERROR, handle_exception);
593 set_excp_vector(EXCEP_ILLINSACC, handle_exception);
594 set_excp_vector(EXCEP_ILLDATACC, handle_exception);
595 set_excp_vector(EXCEP_IOINSACC, handle_exception);
596 set_excp_vector(EXCEP_PRIVINSACC, handle_exception);
597 set_excp_vector(EXCEP_PRIVDATACC, handle_exception);
598 set_excp_vector(EXCEP_DATINSACC, handle_exception);
599 set_excp_vector(EXCEP_FPU_UNIMPINS, handle_exception);
600 set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception);
601
602 set_excp_vector(EXCEP_NMI, nmi);
603
604 set_excp_vector(EXCEP_SYSCALL1, handle_exception);
605 set_excp_vector(EXCEP_SYSCALL2, handle_exception);
606 set_excp_vector(EXCEP_SYSCALL3, handle_exception);
607 set_excp_vector(EXCEP_SYSCALL4, handle_exception);
608 set_excp_vector(EXCEP_SYSCALL5, handle_exception);
609 set_excp_vector(EXCEP_SYSCALL6, handle_exception);
610 set_excp_vector(EXCEP_SYSCALL7, handle_exception);
611 set_excp_vector(EXCEP_SYSCALL8, handle_exception);
612 set_excp_vector(EXCEP_SYSCALL9, handle_exception);
613 set_excp_vector(EXCEP_SYSCALL10, handle_exception);
614 set_excp_vector(EXCEP_SYSCALL11, handle_exception);
615 set_excp_vector(EXCEP_SYSCALL12, handle_exception);
616 set_excp_vector(EXCEP_SYSCALL13, handle_exception);
617 set_excp_vector(EXCEP_SYSCALL14, handle_exception);
618 set_excp_vector(EXCEP_SYSCALL15, handle_exception);
619}
620
621
622
623
624int is_valid_bugaddr(unsigned long pc)
625{
626 return pc >= PAGE_OFFSET;
627}
628
