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32518401af68d274be52d52cf9249505496d07a9
[deliverable/linux.git] / arch / powerpc / kernel / traps.c
1 /*
2 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
3 * Copyright 2007-2010 Freescale Semiconductor, Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 *
10 * Modified by Cort Dougan (cort@cs.nmt.edu)
11 * and Paul Mackerras (paulus@samba.org)
12 */
13
14 /*
15 * This file handles the architecture-dependent parts of hardware exceptions
16 */
17
18 #include <linux/errno.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/stddef.h>
23 #include <linux/unistd.h>
24 #include <linux/ptrace.h>
25 #include <linux/user.h>
26 #include <linux/interrupt.h>
27 #include <linux/init.h>
28 #include <linux/module.h>
29 #include <linux/prctl.h>
30 #include <linux/delay.h>
31 #include <linux/kprobes.h>
32 #include <linux/kexec.h>
33 #include <linux/backlight.h>
34 #include <linux/bug.h>
35 #include <linux/kdebug.h>
36 #include <linux/debugfs.h>
37 #include <linux/ratelimit.h>
38
39 #include <asm/emulated_ops.h>
40 #include <asm/pgtable.h>
41 #include <asm/uaccess.h>
42 #include <asm/io.h>
43 #include <asm/machdep.h>
44 #include <asm/rtas.h>
45 #include <asm/pmc.h>
46 #ifdef CONFIG_PPC32
47 #include <asm/reg.h>
48 #endif
49 #ifdef CONFIG_PMAC_BACKLIGHT
50 #include <asm/backlight.h>
51 #endif
52 #ifdef CONFIG_PPC64
53 #include <asm/firmware.h>
54 #include <asm/processor.h>
55 #endif
56 #include <asm/kexec.h>
57 #include <asm/ppc-opcode.h>
58 #include <asm/rio.h>
59 #include <asm/fadump.h>
60 #include <asm/switch_to.h>
61 #include <asm/debug.h>
62
63 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
64 int (*__debugger)(struct pt_regs *regs) __read_mostly;
65 int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly;
66 int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly;
67 int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly;
68 int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly;
69 int (*__debugger_dabr_match)(struct pt_regs *regs) __read_mostly;
70 int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly;
71
72 EXPORT_SYMBOL(__debugger);
73 EXPORT_SYMBOL(__debugger_ipi);
74 EXPORT_SYMBOL(__debugger_bpt);
75 EXPORT_SYMBOL(__debugger_sstep);
76 EXPORT_SYMBOL(__debugger_iabr_match);
77 EXPORT_SYMBOL(__debugger_dabr_match);
78 EXPORT_SYMBOL(__debugger_fault_handler);
79 #endif
80
81 /*
82 * Trap & Exception support
83 */
84
85 #ifdef CONFIG_PMAC_BACKLIGHT
86 static void pmac_backlight_unblank(void)
87 {
88 mutex_lock(&pmac_backlight_mutex);
89 if (pmac_backlight) {
90 struct backlight_properties *props;
91
92 props = &pmac_backlight->props;
93 props->brightness = props->max_brightness;
94 props->power = FB_BLANK_UNBLANK;
95 backlight_update_status(pmac_backlight);
96 }
97 mutex_unlock(&pmac_backlight_mutex);
98 }
99 #else
100 static inline void pmac_backlight_unblank(void) { }
101 #endif
102
103 static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
104 static int die_owner = -1;
105 static unsigned int die_nest_count;
106 static int die_counter;
107
108 static unsigned __kprobes long oops_begin(struct pt_regs *regs)
109 {
110 int cpu;
111 unsigned long flags;
112
113 if (debugger(regs))
114 return 1;
115
116 oops_enter();
117
118 /* racy, but better than risking deadlock. */
119 raw_local_irq_save(flags);
120 cpu = smp_processor_id();
121 if (!arch_spin_trylock(&die_lock)) {
122 if (cpu == die_owner)
123 /* nested oops. should stop eventually */;
124 else
125 arch_spin_lock(&die_lock);
126 }
127 die_nest_count++;
128 die_owner = cpu;
129 console_verbose();
130 bust_spinlocks(1);
131 if (machine_is(powermac))
132 pmac_backlight_unblank();
133 return flags;
134 }
135
136 static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs,
137 int signr)
138 {
139 bust_spinlocks(0);
140 die_owner = -1;
141 add_taint(TAINT_DIE);
142 die_nest_count--;
143 oops_exit();
144 printk("\n");
145 if (!die_nest_count)
146 /* Nest count reaches zero, release the lock. */
147 arch_spin_unlock(&die_lock);
148 raw_local_irq_restore(flags);
149
150 crash_fadump(regs, "die oops");
151
152 /*
153 * A system reset (0x100) is a request to dump, so we always send
154 * it through the crashdump code.
155 */
156 if (kexec_should_crash(current) || (TRAP(regs) == 0x100)) {
157 crash_kexec(regs);
158
159 /*
160 * We aren't the primary crash CPU. We need to send it
161 * to a holding pattern to avoid it ending up in the panic
162 * code.
163 */
164 crash_kexec_secondary(regs);
165 }
166
167 if (!signr)
168 return;
169
170 /*
171 * While our oops output is serialised by a spinlock, output
172 * from panic() called below can race and corrupt it. If we
173 * know we are going to panic, delay for 1 second so we have a
174 * chance to get clean backtraces from all CPUs that are oopsing.
175 */
176 if (in_interrupt() || panic_on_oops || !current->pid ||
177 is_global_init(current)) {
178 mdelay(MSEC_PER_SEC);
179 }
180
181 if (in_interrupt())
182 panic("Fatal exception in interrupt");
183 if (panic_on_oops)
184 panic("Fatal exception");
185 do_exit(signr);
186 }
187
188 static int __kprobes __die(const char *str, struct pt_regs *regs, long err)
189 {
190 printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
191 #ifdef CONFIG_PREEMPT
192 printk("PREEMPT ");
193 #endif
194 #ifdef CONFIG_SMP
195 printk("SMP NR_CPUS=%d ", NR_CPUS);
196 #endif
197 #ifdef CONFIG_DEBUG_PAGEALLOC
198 printk("DEBUG_PAGEALLOC ");
199 #endif
200 #ifdef CONFIG_NUMA
201 printk("NUMA ");
202 #endif
203 printk("%s\n", ppc_md.name ? ppc_md.name : "");
204
205 if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV) == NOTIFY_STOP)
206 return 1;
207
208 print_modules();
209 show_regs(regs);
210
211 return 0;
212 }
213
214 void die(const char *str, struct pt_regs *regs, long err)
215 {
216 unsigned long flags = oops_begin(regs);
217
218 if (__die(str, regs, err))
219 err = 0;
220 oops_end(flags, regs, err);
221 }
222
223 void user_single_step_siginfo(struct task_struct *tsk,
224 struct pt_regs *regs, siginfo_t *info)
225 {
226 memset(info, 0, sizeof(*info));
227 info->si_signo = SIGTRAP;
228 info->si_code = TRAP_TRACE;
229 info->si_addr = (void __user *)regs->nip;
230 }
231
232 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
233 {
234 siginfo_t info;
235 const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \
236 "at %08lx nip %08lx lr %08lx code %x\n";
237 const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \
238 "at %016lx nip %016lx lr %016lx code %x\n";
239
240 if (!user_mode(regs)) {
241 die("Exception in kernel mode", regs, signr);
242 return;
243 }
244
245 if (show_unhandled_signals && unhandled_signal(current, signr)) {
246 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
247 current->comm, current->pid, signr,
248 addr, regs->nip, regs->link, code);
249 }
250
251 if (arch_irqs_disabled() && !arch_irq_disabled_regs(regs))
252 local_irq_enable();
253
254 current->thread.trap_nr = code;
255 memset(&info, 0, sizeof(info));
256 info.si_signo = signr;
257 info.si_code = code;
258 info.si_addr = (void __user *) addr;
259 force_sig_info(signr, &info, current);
260 }
261
262 #ifdef CONFIG_PPC64
263 void system_reset_exception(struct pt_regs *regs)
264 {
265 /* See if any machine dependent calls */
266 if (ppc_md.system_reset_exception) {
267 if (ppc_md.system_reset_exception(regs))
268 return;
269 }
270
271 die("System Reset", regs, SIGABRT);
272
273 /* Must die if the interrupt is not recoverable */
274 if (!(regs->msr & MSR_RI))
275 panic("Unrecoverable System Reset");
276
277 /* What should we do here? We could issue a shutdown or hard reset. */
278 }
279 #endif
280
281 /*
282 * I/O accesses can cause machine checks on powermacs.
283 * Check if the NIP corresponds to the address of a sync
284 * instruction for which there is an entry in the exception
285 * table.
286 * Note that the 601 only takes a machine check on TEA
287 * (transfer error ack) signal assertion, and does not
288 * set any of the top 16 bits of SRR1.
289 * -- paulus.
290 */
291 static inline int check_io_access(struct pt_regs *regs)
292 {
293 #ifdef CONFIG_PPC32
294 unsigned long msr = regs->msr;
295 const struct exception_table_entry *entry;
296 unsigned int *nip = (unsigned int *)regs->nip;
297
298 if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000)))
299 && (entry = search_exception_tables(regs->nip)) != NULL) {
300 /*
301 * Check that it's a sync instruction, or somewhere
302 * in the twi; isync; nop sequence that inb/inw/inl uses.
303 * As the address is in the exception table
304 * we should be able to read the instr there.
305 * For the debug message, we look at the preceding
306 * load or store.
307 */
308 if (*nip == 0x60000000) /* nop */
309 nip -= 2;
310 else if (*nip == 0x4c00012c) /* isync */
311 --nip;
312 if (*nip == 0x7c0004ac || (*nip >> 26) == 3) {
313 /* sync or twi */
314 unsigned int rb;
315
316 --nip;
317 rb = (*nip >> 11) & 0x1f;
318 printk(KERN_DEBUG "%s bad port %lx at %p\n",
319 (*nip & 0x100)? "OUT to": "IN from",
320 regs->gpr[rb] - _IO_BASE, nip);
321 regs->msr |= MSR_RI;
322 regs->nip = entry->fixup;
323 return 1;
324 }
325 }
326 #endif /* CONFIG_PPC32 */
327 return 0;
328 }
329
330 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
331 /* On 4xx, the reason for the machine check or program exception
332 is in the ESR. */
333 #define get_reason(regs) ((regs)->dsisr)
334 #ifndef CONFIG_FSL_BOOKE
335 #define get_mc_reason(regs) ((regs)->dsisr)
336 #else
337 #define get_mc_reason(regs) (mfspr(SPRN_MCSR))
338 #endif
339 #define REASON_FP ESR_FP
340 #define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
341 #define REASON_PRIVILEGED ESR_PPR
342 #define REASON_TRAP ESR_PTR
343
344 /* single-step stuff */
345 #define single_stepping(regs) (current->thread.dbcr0 & DBCR0_IC)
346 #define clear_single_step(regs) (current->thread.dbcr0 &= ~DBCR0_IC)
347
348 #else
349 /* On non-4xx, the reason for the machine check or program
350 exception is in the MSR. */
351 #define get_reason(regs) ((regs)->msr)
352 #define get_mc_reason(regs) ((regs)->msr)
353 #define REASON_FP 0x100000
354 #define REASON_ILLEGAL 0x80000
355 #define REASON_PRIVILEGED 0x40000
356 #define REASON_TRAP 0x20000
357
358 #define single_stepping(regs) ((regs)->msr & MSR_SE)
359 #define clear_single_step(regs) ((regs)->msr &= ~MSR_SE)
360 #endif
361
362 #if defined(CONFIG_4xx)
363 int machine_check_4xx(struct pt_regs *regs)
364 {
365 unsigned long reason = get_mc_reason(regs);
366
367 if (reason & ESR_IMCP) {
368 printk("Instruction");
369 mtspr(SPRN_ESR, reason & ~ESR_IMCP);
370 } else
371 printk("Data");
372 printk(" machine check in kernel mode.\n");
373
374 return 0;
375 }
376
377 int machine_check_440A(struct pt_regs *regs)
378 {
379 unsigned long reason = get_mc_reason(regs);
380
381 printk("Machine check in kernel mode.\n");
382 if (reason & ESR_IMCP){
383 printk("Instruction Synchronous Machine Check exception\n");
384 mtspr(SPRN_ESR, reason & ~ESR_IMCP);
385 }
386 else {
387 u32 mcsr = mfspr(SPRN_MCSR);
388 if (mcsr & MCSR_IB)
389 printk("Instruction Read PLB Error\n");
390 if (mcsr & MCSR_DRB)
391 printk("Data Read PLB Error\n");
392 if (mcsr & MCSR_DWB)
393 printk("Data Write PLB Error\n");
394 if (mcsr & MCSR_TLBP)
395 printk("TLB Parity Error\n");
396 if (mcsr & MCSR_ICP){
397 flush_instruction_cache();
398 printk("I-Cache Parity Error\n");
399 }
400 if (mcsr & MCSR_DCSP)
401 printk("D-Cache Search Parity Error\n");
402 if (mcsr & MCSR_DCFP)
403 printk("D-Cache Flush Parity Error\n");
404 if (mcsr & MCSR_IMPE)
405 printk("Machine Check exception is imprecise\n");
406
407 /* Clear MCSR */
408 mtspr(SPRN_MCSR, mcsr);
409 }
410 return 0;
411 }
412
413 int machine_check_47x(struct pt_regs *regs)
414 {
415 unsigned long reason = get_mc_reason(regs);
416 u32 mcsr;
417
418 printk(KERN_ERR "Machine check in kernel mode.\n");
419 if (reason & ESR_IMCP) {
420 printk(KERN_ERR
421 "Instruction Synchronous Machine Check exception\n");
422 mtspr(SPRN_ESR, reason & ~ESR_IMCP);
423 return 0;
424 }
425 mcsr = mfspr(SPRN_MCSR);
426 if (mcsr & MCSR_IB)
427 printk(KERN_ERR "Instruction Read PLB Error\n");
428 if (mcsr & MCSR_DRB)
429 printk(KERN_ERR "Data Read PLB Error\n");
430 if (mcsr & MCSR_DWB)
431 printk(KERN_ERR "Data Write PLB Error\n");
432 if (mcsr & MCSR_TLBP)
433 printk(KERN_ERR "TLB Parity Error\n");
434 if (mcsr & MCSR_ICP) {
435 flush_instruction_cache();
436 printk(KERN_ERR "I-Cache Parity Error\n");
437 }
438 if (mcsr & MCSR_DCSP)
439 printk(KERN_ERR "D-Cache Search Parity Error\n");
440 if (mcsr & PPC47x_MCSR_GPR)
441 printk(KERN_ERR "GPR Parity Error\n");
442 if (mcsr & PPC47x_MCSR_FPR)
443 printk(KERN_ERR "FPR Parity Error\n");
444 if (mcsr & PPC47x_MCSR_IPR)
445 printk(KERN_ERR "Machine Check exception is imprecise\n");
446
447 /* Clear MCSR */
448 mtspr(SPRN_MCSR, mcsr);
449
450 return 0;
451 }
452 #elif defined(CONFIG_E500)
453 int machine_check_e500mc(struct pt_regs *regs)
454 {
455 unsigned long mcsr = mfspr(SPRN_MCSR);
456 unsigned long reason = mcsr;
457 int recoverable = 1;
458
459 if (reason & MCSR_LD) {
460 recoverable = fsl_rio_mcheck_exception(regs);
461 if (recoverable == 1)
462 goto silent_out;
463 }
464
465 printk("Machine check in kernel mode.\n");
466 printk("Caused by (from MCSR=%lx): ", reason);
467
468 if (reason & MCSR_MCP)
469 printk("Machine Check Signal\n");
470
471 if (reason & MCSR_ICPERR) {
472 printk("Instruction Cache Parity Error\n");
473
474 /*
475 * This is recoverable by invalidating the i-cache.
476 */
477 mtspr(SPRN_L1CSR1, mfspr(SPRN_L1CSR1) | L1CSR1_ICFI);
478 while (mfspr(SPRN_L1CSR1) & L1CSR1_ICFI)
479 ;
480
481 /*
482 * This will generally be accompanied by an instruction
483 * fetch error report -- only treat MCSR_IF as fatal
484 * if it wasn't due to an L1 parity error.
485 */
486 reason &= ~MCSR_IF;
487 }
488
489 if (reason & MCSR_DCPERR_MC) {
490 printk("Data Cache Parity Error\n");
491
492 /*
493 * In write shadow mode we auto-recover from the error, but it
494 * may still get logged and cause a machine check. We should
495 * only treat the non-write shadow case as non-recoverable.
496 */
497 if (!(mfspr(SPRN_L1CSR2) & L1CSR2_DCWS))
498 recoverable = 0;
499 }
500
501 if (reason & MCSR_L2MMU_MHIT) {
502 printk("Hit on multiple TLB entries\n");
503 recoverable = 0;
504 }
505
506 if (reason & MCSR_NMI)
507 printk("Non-maskable interrupt\n");
508
509 if (reason & MCSR_IF) {
510 printk("Instruction Fetch Error Report\n");
511 recoverable = 0;
512 }
513
514 if (reason & MCSR_LD) {
515 printk("Load Error Report\n");
516 recoverable = 0;
517 }
518
519 if (reason & MCSR_ST) {
520 printk("Store Error Report\n");
521 recoverable = 0;
522 }
523
524 if (reason & MCSR_LDG) {
525 printk("Guarded Load Error Report\n");
526 recoverable = 0;
527 }
528
529 if (reason & MCSR_TLBSYNC)
530 printk("Simultaneous tlbsync operations\n");
531
532 if (reason & MCSR_BSL2_ERR) {
533 printk("Level 2 Cache Error\n");
534 recoverable = 0;
535 }
536
537 if (reason & MCSR_MAV) {
538 u64 addr;
539
540 addr = mfspr(SPRN_MCAR);
541 addr |= (u64)mfspr(SPRN_MCARU) << 32;
542
543 printk("Machine Check %s Address: %#llx\n",
544 reason & MCSR_MEA ? "Effective" : "Physical", addr);
545 }
546
547 silent_out:
548 mtspr(SPRN_MCSR, mcsr);
549 return mfspr(SPRN_MCSR) == 0 && recoverable;
550 }
551
552 int machine_check_e500(struct pt_regs *regs)
553 {
554 unsigned long reason = get_mc_reason(regs);
555
556 if (reason & MCSR_BUS_RBERR) {
557 if (fsl_rio_mcheck_exception(regs))
558 return 1;
559 }
560
561 printk("Machine check in kernel mode.\n");
562 printk("Caused by (from MCSR=%lx): ", reason);
563
564 if (reason & MCSR_MCP)
565 printk("Machine Check Signal\n");
566 if (reason & MCSR_ICPERR)
567 printk("Instruction Cache Parity Error\n");
568 if (reason & MCSR_DCP_PERR)
569 printk("Data Cache Push Parity Error\n");
570 if (reason & MCSR_DCPERR)
571 printk("Data Cache Parity Error\n");
572 if (reason & MCSR_BUS_IAERR)
573 printk("Bus - Instruction Address Error\n");
574 if (reason & MCSR_BUS_RAERR)
575 printk("Bus - Read Address Error\n");
576 if (reason & MCSR_BUS_WAERR)
577 printk("Bus - Write Address Error\n");
578 if (reason & MCSR_BUS_IBERR)
579 printk("Bus - Instruction Data Error\n");
580 if (reason & MCSR_BUS_RBERR)
581 printk("Bus - Read Data Bus Error\n");
582 if (reason & MCSR_BUS_WBERR)
583 printk("Bus - Read Data Bus Error\n");
584 if (reason & MCSR_BUS_IPERR)
585 printk("Bus - Instruction Parity Error\n");
586 if (reason & MCSR_BUS_RPERR)
587 printk("Bus - Read Parity Error\n");
588
589 return 0;
590 }
591
592 int machine_check_generic(struct pt_regs *regs)
593 {
594 return 0;
595 }
596 #elif defined(CONFIG_E200)
597 int machine_check_e200(struct pt_regs *regs)
598 {
599 unsigned long reason = get_mc_reason(regs);
600
601 printk("Machine check in kernel mode.\n");
602 printk("Caused by (from MCSR=%lx): ", reason);
603
604 if (reason & MCSR_MCP)
605 printk("Machine Check Signal\n");
606 if (reason & MCSR_CP_PERR)
607 printk("Cache Push Parity Error\n");
608 if (reason & MCSR_CPERR)
609 printk("Cache Parity Error\n");
610 if (reason & MCSR_EXCP_ERR)
611 printk("ISI, ITLB, or Bus Error on first instruction fetch for an exception handler\n");
612 if (reason & MCSR_BUS_IRERR)
613 printk("Bus - Read Bus Error on instruction fetch\n");
614 if (reason & MCSR_BUS_DRERR)
615 printk("Bus - Read Bus Error on data load\n");
616 if (reason & MCSR_BUS_WRERR)
617 printk("Bus - Write Bus Error on buffered store or cache line push\n");
618
619 return 0;
620 }
621 #else
622 int machine_check_generic(struct pt_regs *regs)
623 {
624 unsigned long reason = get_mc_reason(regs);
625
626 printk("Machine check in kernel mode.\n");
627 printk("Caused by (from SRR1=%lx): ", reason);
628 switch (reason & 0x601F0000) {
629 case 0x80000:
630 printk("Machine check signal\n");
631 break;
632 case 0: /* for 601 */
633 case 0x40000:
634 case 0x140000: /* 7450 MSS error and TEA */
635 printk("Transfer error ack signal\n");
636 break;
637 case 0x20000:
638 printk("Data parity error signal\n");
639 break;
640 case 0x10000:
641 printk("Address parity error signal\n");
642 break;
643 case 0x20000000:
644 printk("L1 Data Cache error\n");
645 break;
646 case 0x40000000:
647 printk("L1 Instruction Cache error\n");
648 break;
649 case 0x00100000:
650 printk("L2 data cache parity error\n");
651 break;
652 default:
653 printk("Unknown values in msr\n");
654 }
655 return 0;
656 }
657 #endif /* everything else */
658
659 void machine_check_exception(struct pt_regs *regs)
660 {
661 int recover = 0;
662
663 __get_cpu_var(irq_stat).mce_exceptions++;
664
665 /* See if any machine dependent calls. In theory, we would want
666 * to call the CPU first, and call the ppc_md. one if the CPU
667 * one returns a positive number. However there is existing code
668 * that assumes the board gets a first chance, so let's keep it
669 * that way for now and fix things later. --BenH.
670 */
671 if (ppc_md.machine_check_exception)
672 recover = ppc_md.machine_check_exception(regs);
673 else if (cur_cpu_spec->machine_check)
674 recover = cur_cpu_spec->machine_check(regs);
675
676 if (recover > 0)
677 return;
678
679 #if defined(CONFIG_8xx) && defined(CONFIG_PCI)
680 /* the qspan pci read routines can cause machine checks -- Cort
681 *
682 * yuck !!! that totally needs to go away ! There are better ways
683 * to deal with that than having a wart in the mcheck handler.
684 * -- BenH
685 */
686 bad_page_fault(regs, regs->dar, SIGBUS);
687 return;
688 #endif
689
690 if (debugger_fault_handler(regs))
691 return;
692
693 if (check_io_access(regs))
694 return;
695
696 die("Machine check", regs, SIGBUS);
697
698 /* Must die if the interrupt is not recoverable */
699 if (!(regs->msr & MSR_RI))
700 panic("Unrecoverable Machine check");
701 }
702
703 void SMIException(struct pt_regs *regs)
704 {
705 die("System Management Interrupt", regs, SIGABRT);
706 }
707
708 void unknown_exception(struct pt_regs *regs)
709 {
710 printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
711 regs->nip, regs->msr, regs->trap);
712
713 _exception(SIGTRAP, regs, 0, 0);
714 }
715
716 void instruction_breakpoint_exception(struct pt_regs *regs)
717 {
718 if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5,
719 5, SIGTRAP) == NOTIFY_STOP)
720 return;
721 if (debugger_iabr_match(regs))
722 return;
723 _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
724 }
725
726 void RunModeException(struct pt_regs *regs)
727 {
728 _exception(SIGTRAP, regs, 0, 0);
729 }
730
731 void __kprobes single_step_exception(struct pt_regs *regs)
732 {
733 clear_single_step(regs);
734
735 if (notify_die(DIE_SSTEP, "single_step", regs, 5,
736 5, SIGTRAP) == NOTIFY_STOP)
737 return;
738 if (debugger_sstep(regs))
739 return;
740
741 _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
742 }
743
744 /*
745 * After we have successfully emulated an instruction, we have to
746 * check if the instruction was being single-stepped, and if so,
747 * pretend we got a single-step exception. This was pointed out
748 * by Kumar Gala. -- paulus
749 */
750 static void emulate_single_step(struct pt_regs *regs)
751 {
752 if (single_stepping(regs))
753 single_step_exception(regs);
754 }
755
756 static inline int __parse_fpscr(unsigned long fpscr)
757 {
758 int ret = 0;
759
760 /* Invalid operation */
761 if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
762 ret = FPE_FLTINV;
763
764 /* Overflow */
765 else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX))
766 ret = FPE_FLTOVF;
767
768 /* Underflow */
769 else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX))
770 ret = FPE_FLTUND;
771
772 /* Divide by zero */
773 else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX))
774 ret = FPE_FLTDIV;
775
776 /* Inexact result */
777 else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX))
778 ret = FPE_FLTRES;
779
780 return ret;
781 }
782
783 static void parse_fpe(struct pt_regs *regs)
784 {
785 int code = 0;
786
787 flush_fp_to_thread(current);
788
789 code = __parse_fpscr(current->thread.fpscr.val);
790
791 _exception(SIGFPE, regs, code, regs->nip);
792 }
793
794 /*
795 * Illegal instruction emulation support. Originally written to
796 * provide the PVR to user applications using the mfspr rd, PVR.
797 * Return non-zero if we can't emulate, or -EFAULT if the associated
798 * memory access caused an access fault. Return zero on success.
799 *
800 * There are a couple of ways to do this, either "decode" the instruction
801 * or directly match lots of bits. In this case, matching lots of
802 * bits is faster and easier.
803 *
804 */
805 static int emulate_string_inst(struct pt_regs *regs, u32 instword)
806 {
807 u8 rT = (instword >> 21) & 0x1f;
808 u8 rA = (instword >> 16) & 0x1f;
809 u8 NB_RB = (instword >> 11) & 0x1f;
810 u32 num_bytes;
811 unsigned long EA;
812 int pos = 0;
813
814 /* Early out if we are an invalid form of lswx */
815 if ((instword & PPC_INST_STRING_MASK) == PPC_INST_LSWX)
816 if ((rT == rA) || (rT == NB_RB))
817 return -EINVAL;
818
819 EA = (rA == 0) ? 0 : regs->gpr[rA];
820
821 switch (instword & PPC_INST_STRING_MASK) {
822 case PPC_INST_LSWX:
823 case PPC_INST_STSWX:
824 EA += NB_RB;
825 num_bytes = regs->xer & 0x7f;
826 break;
827 case PPC_INST_LSWI:
828 case PPC_INST_STSWI:
829 num_bytes = (NB_RB == 0) ? 32 : NB_RB;
830 break;
831 default:
832 return -EINVAL;
833 }
834
835 while (num_bytes != 0)
836 {
837 u8 val;
838 u32 shift = 8 * (3 - (pos & 0x3));
839
840 switch ((instword & PPC_INST_STRING_MASK)) {
841 case PPC_INST_LSWX:
842 case PPC_INST_LSWI:
843 if (get_user(val, (u8 __user *)EA))
844 return -EFAULT;
845 /* first time updating this reg,
846 * zero it out */
847 if (pos == 0)
848 regs->gpr[rT] = 0;
849 regs->gpr[rT] |= val << shift;
850 break;
851 case PPC_INST_STSWI:
852 case PPC_INST_STSWX:
853 val = regs->gpr[rT] >> shift;
854 if (put_user(val, (u8 __user *)EA))
855 return -EFAULT;
856 break;
857 }
858 /* move EA to next address */
859 EA += 1;
860 num_bytes--;
861
862 /* manage our position within the register */
863 if (++pos == 4) {
864 pos = 0;
865 if (++rT == 32)
866 rT = 0;
867 }
868 }
869
870 return 0;
871 }
872
873 static int emulate_popcntb_inst(struct pt_regs *regs, u32 instword)
874 {
875 u32 ra,rs;
876 unsigned long tmp;
877
878 ra = (instword >> 16) & 0x1f;
879 rs = (instword >> 21) & 0x1f;
880
881 tmp = regs->gpr[rs];
882 tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL);
883 tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL);
884 tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
885 regs->gpr[ra] = tmp;
886
887 return 0;
888 }
889
890 static int emulate_isel(struct pt_regs *regs, u32 instword)
891 {
892 u8 rT = (instword >> 21) & 0x1f;
893 u8 rA = (instword >> 16) & 0x1f;
894 u8 rB = (instword >> 11) & 0x1f;
895 u8 BC = (instword >> 6) & 0x1f;
896 u8 bit;
897 unsigned long tmp;
898
899 tmp = (rA == 0) ? 0 : regs->gpr[rA];
900 bit = (regs->ccr >> (31 - BC)) & 0x1;
901
902 regs->gpr[rT] = bit ? tmp : regs->gpr[rB];
903
904 return 0;
905 }
906
907 static int emulate_instruction(struct pt_regs *regs)
908 {
909 u32 instword;
910 u32 rd;
911
912 if (!user_mode(regs) || (regs->msr & MSR_LE))
913 return -EINVAL;
914 CHECK_FULL_REGS(regs);
915
916 if (get_user(instword, (u32 __user *)(regs->nip)))
917 return -EFAULT;
918
919 /* Emulate the mfspr rD, PVR. */
920 if ((instword & PPC_INST_MFSPR_PVR_MASK) == PPC_INST_MFSPR_PVR) {
921 PPC_WARN_EMULATED(mfpvr, regs);
922 rd = (instword >> 21) & 0x1f;
923 regs->gpr[rd] = mfspr(SPRN_PVR);
924 return 0;
925 }
926
927 /* Emulating the dcba insn is just a no-op. */
928 if ((instword & PPC_INST_DCBA_MASK) == PPC_INST_DCBA) {
929 PPC_WARN_EMULATED(dcba, regs);
930 return 0;
931 }
932
933 /* Emulate the mcrxr insn. */
934 if ((instword & PPC_INST_MCRXR_MASK) == PPC_INST_MCRXR) {
935 int shift = (instword >> 21) & 0x1c;
936 unsigned long msk = 0xf0000000UL >> shift;
937
938 PPC_WARN_EMULATED(mcrxr, regs);
939 regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk);
940 regs->xer &= ~0xf0000000UL;
941 return 0;
942 }
943
944 /* Emulate load/store string insn. */
945 if ((instword & PPC_INST_STRING_GEN_MASK) == PPC_INST_STRING) {
946 PPC_WARN_EMULATED(string, regs);
947 return emulate_string_inst(regs, instword);
948 }
949
950 /* Emulate the popcntb (Population Count Bytes) instruction. */
951 if ((instword & PPC_INST_POPCNTB_MASK) == PPC_INST_POPCNTB) {
952 PPC_WARN_EMULATED(popcntb, regs);
953 return emulate_popcntb_inst(regs, instword);
954 }
955
956 /* Emulate isel (Integer Select) instruction */
957 if ((instword & PPC_INST_ISEL_MASK) == PPC_INST_ISEL) {
958 PPC_WARN_EMULATED(isel, regs);
959 return emulate_isel(regs, instword);
960 }
961
962 #ifdef CONFIG_PPC64
963 /* Emulate the mfspr rD, DSCR. */
964 if (((instword & PPC_INST_MFSPR_DSCR_MASK) == PPC_INST_MFSPR_DSCR) &&
965 cpu_has_feature(CPU_FTR_DSCR)) {
966 PPC_WARN_EMULATED(mfdscr, regs);
967 rd = (instword >> 21) & 0x1f;
968 regs->gpr[rd] = mfspr(SPRN_DSCR);
969 return 0;
970 }
971 /* Emulate the mtspr DSCR, rD. */
972 if (((instword & PPC_INST_MTSPR_DSCR_MASK) == PPC_INST_MTSPR_DSCR) &&
973 cpu_has_feature(CPU_FTR_DSCR)) {
974 PPC_WARN_EMULATED(mtdscr, regs);
975 rd = (instword >> 21) & 0x1f;
976 current->thread.dscr = regs->gpr[rd];
977 current->thread.dscr_inherit = 1;
978 mtspr(SPRN_DSCR, current->thread.dscr);
979 return 0;
980 }
981 #endif
982
983 return -EINVAL;
984 }
985
986 int is_valid_bugaddr(unsigned long addr)
987 {
988 return is_kernel_addr(addr);
989 }
990
991 void __kprobes program_check_exception(struct pt_regs *regs)
992 {
993 unsigned int reason = get_reason(regs);
994 extern int do_mathemu(struct pt_regs *regs);
995
996 /* We can now get here via a FP Unavailable exception if the core
997 * has no FPU, in that case the reason flags will be 0 */
998
999 if (reason & REASON_FP) {
1000 /* IEEE FP exception */
1001 parse_fpe(regs);
1002 return;
1003 }
1004 if (reason & REASON_TRAP) {
1005 /* Debugger is first in line to stop recursive faults in
1006 * rcu_lock, notify_die, or atomic_notifier_call_chain */
1007 if (debugger_bpt(regs))
1008 return;
1009
1010 /* trap exception */
1011 if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP)
1012 == NOTIFY_STOP)
1013 return;
1014
1015 if (!(regs->msr & MSR_PR) && /* not user-mode */
1016 report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
1017 regs->nip += 4;
1018 return;
1019 }
1020 _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
1021 return;
1022 }
1023
1024 /* We restore the interrupt state now */
1025 if (!arch_irq_disabled_regs(regs))
1026 local_irq_enable();
1027
1028 #ifdef CONFIG_MATH_EMULATION
1029 /* (reason & REASON_ILLEGAL) would be the obvious thing here,
1030 * but there seems to be a hardware bug on the 405GP (RevD)
1031 * that means ESR is sometimes set incorrectly - either to
1032 * ESR_DST (!?) or 0. In the process of chasing this with the
1033 * hardware people - not sure if it can happen on any illegal
1034 * instruction or only on FP instructions, whether there is a
1035 * pattern to occurrences etc. -dgibson 31/Mar/2003 */
1036 switch (do_mathemu(regs)) {
1037 case 0:
1038 emulate_single_step(regs);
1039 return;
1040 case 1: {
1041 int code = 0;
1042 code = __parse_fpscr(current->thread.fpscr.val);
1043 _exception(SIGFPE, regs, code, regs->nip);
1044 return;
1045 }
1046 case -EFAULT:
1047 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
1048 return;
1049 }
1050 /* fall through on any other errors */
1051 #endif /* CONFIG_MATH_EMULATION */
1052
1053 /* Try to emulate it if we should. */
1054 if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
1055 switch (emulate_instruction(regs)) {
1056 case 0:
1057 regs->nip += 4;
1058 emulate_single_step(regs);
1059 return;
1060 case -EFAULT:
1061 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
1062 return;
1063 }
1064 }
1065
1066 if (reason & REASON_PRIVILEGED)
1067 _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
1068 else
1069 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
1070 }
1071
1072 void alignment_exception(struct pt_regs *regs)
1073 {
1074 int sig, code, fixed = 0;
1075
1076 /* We restore the interrupt state now */
1077 if (!arch_irq_disabled_regs(regs))
1078 local_irq_enable();
1079
1080 /* we don't implement logging of alignment exceptions */
1081 if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS))
1082 fixed = fix_alignment(regs);
1083
1084 if (fixed == 1) {
1085 regs->nip += 4; /* skip over emulated instruction */
1086 emulate_single_step(regs);
1087 return;
1088 }
1089
1090 /* Operand address was bad */
1091 if (fixed == -EFAULT) {
1092 sig = SIGSEGV;
1093 code = SEGV_ACCERR;
1094 } else {
1095 sig = SIGBUS;
1096 code = BUS_ADRALN;
1097 }
1098 if (user_mode(regs))
1099 _exception(sig, regs, code, regs->dar);
1100 else
1101 bad_page_fault(regs, regs->dar, sig);
1102 }
1103
1104 void StackOverflow(struct pt_regs *regs)
1105 {
1106 printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",
1107 current, regs->gpr[1]);
1108 debugger(regs);
1109 show_regs(regs);
1110 panic("kernel stack overflow");
1111 }
1112
1113 void nonrecoverable_exception(struct pt_regs *regs)
1114 {
1115 printk(KERN_ERR "Non-recoverable exception at PC=%lx MSR=%lx\n",
1116 regs->nip, regs->msr);
1117 debugger(regs);
1118 die("nonrecoverable exception", regs, SIGKILL);
1119 }
1120
1121 void trace_syscall(struct pt_regs *regs)
1122 {
1123 printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n",
1124 current, task_pid_nr(current), regs->nip, regs->link, regs->gpr[0],
1125 regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted());
1126 }
1127
1128 void kernel_fp_unavailable_exception(struct pt_regs *regs)
1129 {
1130 printk(KERN_EMERG "Unrecoverable FP Unavailable Exception "
1131 "%lx at %lx\n", regs->trap, regs->nip);
1132 die("Unrecoverable FP Unavailable Exception", regs, SIGABRT);
1133 }
1134
1135 void altivec_unavailable_exception(struct pt_regs *regs)
1136 {
1137 if (user_mode(regs)) {
1138 /* A user program has executed an altivec instruction,
1139 but this kernel doesn't support altivec. */
1140 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
1141 return;
1142 }
1143
1144 printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
1145 "%lx at %lx\n", regs->trap, regs->nip);
1146 die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
1147 }
1148
1149 void vsx_unavailable_exception(struct pt_regs *regs)
1150 {
1151 if (user_mode(regs)) {
1152 /* A user program has executed an vsx instruction,
1153 but this kernel doesn't support vsx. */
1154 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
1155 return;
1156 }
1157
1158 printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception "
1159 "%lx at %lx\n", regs->trap, regs->nip);
1160 die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT);
1161 }
1162
1163 void performance_monitor_exception(struct pt_regs *regs)
1164 {
1165 __get_cpu_var(irq_stat).pmu_irqs++;
1166
1167 perf_irq(regs);
1168 }
1169
1170 #ifdef CONFIG_8xx
1171 void SoftwareEmulation(struct pt_regs *regs)
1172 {
1173 extern int do_mathemu(struct pt_regs *);
1174 extern int Soft_emulate_8xx(struct pt_regs *);
1175 #if defined(CONFIG_MATH_EMULATION) || defined(CONFIG_8XX_MINIMAL_FPEMU)
1176 int errcode;
1177 #endif
1178
1179 CHECK_FULL_REGS(regs);
1180
1181 if (!user_mode(regs)) {
1182 debugger(regs);
1183 die("Kernel Mode Software FPU Emulation", regs, SIGFPE);
1184 }
1185
1186 #ifdef CONFIG_MATH_EMULATION
1187 errcode = do_mathemu(regs);
1188 if (errcode >= 0)
1189 PPC_WARN_EMULATED(math, regs);
1190
1191 switch (errcode) {
1192 case 0:
1193 emulate_single_step(regs);
1194 return;
1195 case 1: {
1196 int code = 0;
1197 code = __parse_fpscr(current->thread.fpscr.val);
1198 _exception(SIGFPE, regs, code, regs->nip);
1199 return;
1200 }
1201 case -EFAULT:
1202 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
1203 return;
1204 default:
1205 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
1206 return;
1207 }
1208
1209 #elif defined(CONFIG_8XX_MINIMAL_FPEMU)
1210 errcode = Soft_emulate_8xx(regs);
1211 if (errcode >= 0)
1212 PPC_WARN_EMULATED(8xx, regs);
1213
1214 switch (errcode) {
1215 case 0:
1216 emulate_single_step(regs);
1217 return;
1218 case 1:
1219 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
1220 return;
1221 case -EFAULT:
1222 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
1223 return;
1224 }
1225 #else
1226 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
1227 #endif
1228 }
1229 #endif /* CONFIG_8xx */
1230
1231 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1232 static void handle_debug(struct pt_regs *regs, unsigned long debug_status)
1233 {
1234 int changed = 0;
1235 /*
1236 * Determine the cause of the debug event, clear the
1237 * event flags and send a trap to the handler. Torez
1238 */
1239 if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) {
1240 dbcr_dac(current) &= ~(DBCR_DAC1R | DBCR_DAC1W);
1241 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1242 current->thread.dbcr2 &= ~DBCR2_DAC12MODE;
1243 #endif
1244 do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT,
1245 5);
1246 changed |= 0x01;
1247 } else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) {
1248 dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W);
1249 do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT,
1250 6);
1251 changed |= 0x01;
1252 } else if (debug_status & DBSR_IAC1) {
1253 current->thread.dbcr0 &= ~DBCR0_IAC1;
1254 dbcr_iac_range(current) &= ~DBCR_IAC12MODE;
1255 do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT,
1256 1);
1257 changed |= 0x01;
1258 } else if (debug_status & DBSR_IAC2) {
1259 current->thread.dbcr0 &= ~DBCR0_IAC2;
1260 do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT,
1261 2);
1262 changed |= 0x01;
1263 } else if (debug_status & DBSR_IAC3) {
1264 current->thread.dbcr0 &= ~DBCR0_IAC3;
1265 dbcr_iac_range(current) &= ~DBCR_IAC34MODE;
1266 do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT,
1267 3);
1268 changed |= 0x01;
1269 } else if (debug_status & DBSR_IAC4) {
1270 current->thread.dbcr0 &= ~DBCR0_IAC4;
1271 do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT,
1272 4);
1273 changed |= 0x01;
1274 }
1275 /*
1276 * At the point this routine was called, the MSR(DE) was turned off.
1277 * Check all other debug flags and see if that bit needs to be turned
1278 * back on or not.
1279 */
1280 if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0, current->thread.dbcr1))
1281 regs->msr |= MSR_DE;
1282 else
1283 /* Make sure the IDM flag is off */
1284 current->thread.dbcr0 &= ~DBCR0_IDM;
1285
1286 if (changed & 0x01)
1287 mtspr(SPRN_DBCR0, current->thread.dbcr0);
1288 }
1289
1290 void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
1291 {
1292 current->thread.dbsr = debug_status;
1293
1294 /* Hack alert: On BookE, Branch Taken stops on the branch itself, while
1295 * on server, it stops on the target of the branch. In order to simulate
1296 * the server behaviour, we thus restart right away with a single step
1297 * instead of stopping here when hitting a BT
1298 */
1299 if (debug_status & DBSR_BT) {
1300 regs->msr &= ~MSR_DE;
1301
1302 /* Disable BT */
1303 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_BT);
1304 /* Clear the BT event */
1305 mtspr(SPRN_DBSR, DBSR_BT);
1306
1307 /* Do the single step trick only when coming from userspace */
1308 if (user_mode(regs)) {
1309 current->thread.dbcr0 &= ~DBCR0_BT;
1310 current->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
1311 regs->msr |= MSR_DE;
1312 return;
1313 }
1314
1315 if (notify_die(DIE_SSTEP, "block_step", regs, 5,
1316 5, SIGTRAP) == NOTIFY_STOP) {
1317 return;
1318 }
1319 if (debugger_sstep(regs))
1320 return;
1321 } else if (debug_status & DBSR_IC) { /* Instruction complete */
1322 regs->msr &= ~MSR_DE;
1323
1324 /* Disable instruction completion */
1325 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
1326 /* Clear the instruction completion event */
1327 mtspr(SPRN_DBSR, DBSR_IC);
1328
1329 if (notify_die(DIE_SSTEP, "single_step", regs, 5,
1330 5, SIGTRAP) == NOTIFY_STOP) {
1331 return;
1332 }
1333
1334 if (debugger_sstep(regs))
1335 return;
1336
1337 if (user_mode(regs)) {
1338 current->thread.dbcr0 &= ~DBCR0_IC;
1339 if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0,
1340 current->thread.dbcr1))
1341 regs->msr |= MSR_DE;
1342 else
1343 /* Make sure the IDM bit is off */
1344 current->thread.dbcr0 &= ~DBCR0_IDM;
1345 }
1346
1347 _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
1348 } else
1349 handle_debug(regs, debug_status);
1350 }
1351 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1352
1353 #if !defined(CONFIG_TAU_INT)
1354 void TAUException(struct pt_regs *regs)
1355 {
1356 printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
1357 regs->nip, regs->msr, regs->trap, print_tainted());
1358 }
1359 #endif /* CONFIG_INT_TAU */
1360
1361 #ifdef CONFIG_ALTIVEC
1362 void altivec_assist_exception(struct pt_regs *regs)
1363 {
1364 int err;
1365
1366 if (!user_mode(regs)) {
1367 printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode"
1368 " at %lx\n", regs->nip);
1369 die("Kernel VMX/Altivec assist exception", regs, SIGILL);
1370 }
1371
1372 flush_altivec_to_thread(current);
1373
1374 PPC_WARN_EMULATED(altivec, regs);
1375 err = emulate_altivec(regs);
1376 if (err == 0) {
1377 regs->nip += 4; /* skip emulated instruction */
1378 emulate_single_step(regs);
1379 return;
1380 }
1381
1382 if (err == -EFAULT) {
1383 /* got an error reading the instruction */
1384 _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
1385 } else {
1386 /* didn't recognize the instruction */
1387 /* XXX quick hack for now: set the non-Java bit in the VSCR */
1388 printk_ratelimited(KERN_ERR "Unrecognized altivec instruction "
1389 "in %s at %lx\n", current->comm, regs->nip);
1390 current->thread.vscr.u[3] |= 0x10000;
1391 }
1392 }
1393 #endif /* CONFIG_ALTIVEC */
1394
1395 #ifdef CONFIG_VSX
1396 void vsx_assist_exception(struct pt_regs *regs)
1397 {
1398 if (!user_mode(regs)) {
1399 printk(KERN_EMERG "VSX assist exception in kernel mode"
1400 " at %lx\n", regs->nip);
1401 die("Kernel VSX assist exception", regs, SIGILL);
1402 }
1403
1404 flush_vsx_to_thread(current);
1405 printk(KERN_INFO "VSX assist not supported at %lx\n", regs->nip);
1406 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
1407 }
1408 #endif /* CONFIG_VSX */
1409
1410 #ifdef CONFIG_FSL_BOOKE
1411 void CacheLockingException(struct pt_regs *regs, unsigned long address,
1412 unsigned long error_code)
1413 {
1414 /* We treat cache locking instructions from the user
1415 * as priv ops, in the future we could try to do
1416 * something smarter
1417 */
1418 if (error_code & (ESR_DLK|ESR_ILK))
1419 _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
1420 return;
1421 }
1422 #endif /* CONFIG_FSL_BOOKE */
1423
1424 #ifdef CONFIG_SPE
1425 void SPEFloatingPointException(struct pt_regs *regs)
1426 {
1427 extern int do_spe_mathemu(struct pt_regs *regs);
1428 unsigned long spefscr;
1429 int fpexc_mode;
1430 int code = 0;
1431 int err;
1432
1433 flush_spe_to_thread(current);
1434
1435 spefscr = current->thread.spefscr;
1436 fpexc_mode = current->thread.fpexc_mode;
1437
1438 if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) {
1439 code = FPE_FLTOVF;
1440 }
1441 else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) {
1442 code = FPE_FLTUND;
1443 }
1444 else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV))
1445 code = FPE_FLTDIV;
1446 else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) {
1447 code = FPE_FLTINV;
1448 }
1449 else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES))
1450 code = FPE_FLTRES;
1451
1452 err = do_spe_mathemu(regs);
1453 if (err == 0) {
1454 regs->nip += 4; /* skip emulated instruction */
1455 emulate_single_step(regs);
1456 return;
1457 }
1458
1459 if (err == -EFAULT) {
1460 /* got an error reading the instruction */
1461 _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
1462 } else if (err == -EINVAL) {
1463 /* didn't recognize the instruction */
1464 printk(KERN_ERR "unrecognized spe instruction "
1465 "in %s at %lx\n", current->comm, regs->nip);
1466 } else {
1467 _exception(SIGFPE, regs, code, regs->nip);
1468 }
1469
1470 return;
1471 }
1472
1473 void SPEFloatingPointRoundException(struct pt_regs *regs)
1474 {
1475 extern int speround_handler(struct pt_regs *regs);
1476 int err;
1477
1478 preempt_disable();
1479 if (regs->msr & MSR_SPE)
1480 giveup_spe(current);
1481 preempt_enable();
1482
1483 regs->nip -= 4;
1484 err = speround_handler(regs);
1485 if (err == 0) {
1486 regs->nip += 4; /* skip emulated instruction */
1487 emulate_single_step(regs);
1488 return;
1489 }
1490
1491 if (err == -EFAULT) {
1492 /* got an error reading the instruction */
1493 _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
1494 } else if (err == -EINVAL) {
1495 /* didn't recognize the instruction */
1496 printk(KERN_ERR "unrecognized spe instruction "
1497 "in %s at %lx\n", current->comm, regs->nip);
1498 } else {
1499 _exception(SIGFPE, regs, 0, regs->nip);
1500 return;
1501 }
1502 }
1503 #endif
1504
1505 /*
1506 * We enter here if we get an unrecoverable exception, that is, one
1507 * that happened at a point where the RI (recoverable interrupt) bit
1508 * in the MSR is 0. This indicates that SRR0/1 are live, and that
1509 * we therefore lost state by taking this exception.
1510 */
1511 void unrecoverable_exception(struct pt_regs *regs)
1512 {
1513 printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n",
1514 regs->trap, regs->nip);
1515 die("Unrecoverable exception", regs, SIGABRT);
1516 }
1517
1518 #ifdef CONFIG_BOOKE_WDT
1519 /*
1520 * Default handler for a Watchdog exception,
1521 * spins until a reboot occurs
1522 */
1523 void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs)
1524 {
1525 /* Generic WatchdogHandler, implement your own */
1526 mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE));
1527 return;
1528 }
1529
1530 void WatchdogException(struct pt_regs *regs)
1531 {
1532 printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n");
1533 WatchdogHandler(regs);
1534 }
1535 #endif
1536
1537 /*
1538 * We enter here if we discover during exception entry that we are
1539 * running in supervisor mode with a userspace value in the stack pointer.
1540 */
1541 void kernel_bad_stack(struct pt_regs *regs)
1542 {
1543 printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n",
1544 regs->gpr[1], regs->nip);
1545 die("Bad kernel stack pointer", regs, SIGABRT);
1546 }
1547
1548 void __init trap_init(void)
1549 {
1550 }
1551
1552
1553 #ifdef CONFIG_PPC_EMULATED_STATS
1554
1555 #define WARN_EMULATED_SETUP(type) .type = { .name = #type }
1556
1557 struct ppc_emulated ppc_emulated = {
1558 #ifdef CONFIG_ALTIVEC
1559 WARN_EMULATED_SETUP(altivec),
1560 #endif
1561 WARN_EMULATED_SETUP(dcba),
1562 WARN_EMULATED_SETUP(dcbz),
1563 WARN_EMULATED_SETUP(fp_pair),
1564 WARN_EMULATED_SETUP(isel),
1565 WARN_EMULATED_SETUP(mcrxr),
1566 WARN_EMULATED_SETUP(mfpvr),
1567 WARN_EMULATED_SETUP(multiple),
1568 WARN_EMULATED_SETUP(popcntb),
1569 WARN_EMULATED_SETUP(spe),
1570 WARN_EMULATED_SETUP(string),
1571 WARN_EMULATED_SETUP(unaligned),
1572 #ifdef CONFIG_MATH_EMULATION
1573 WARN_EMULATED_SETUP(math),
1574 #elif defined(CONFIG_8XX_MINIMAL_FPEMU)
1575 WARN_EMULATED_SETUP(8xx),
1576 #endif
1577 #ifdef CONFIG_VSX
1578 WARN_EMULATED_SETUP(vsx),
1579 #endif
1580 #ifdef CONFIG_PPC64
1581 WARN_EMULATED_SETUP(mfdscr),
1582 WARN_EMULATED_SETUP(mtdscr),
1583 #endif
1584 };
1585
1586 u32 ppc_warn_emulated;
1587
1588 void ppc_warn_emulated_print(const char *type)
1589 {
1590 pr_warn_ratelimited("%s used emulated %s instruction\n", current->comm,
1591 type);
1592 }
1593
1594 static int __init ppc_warn_emulated_init(void)
1595 {
1596 struct dentry *dir, *d;
1597 unsigned int i;
1598 struct ppc_emulated_entry *entries = (void *)&ppc_emulated;
1599
1600 if (!powerpc_debugfs_root)
1601 return -ENODEV;
1602
1603 dir = debugfs_create_dir("emulated_instructions",
1604 powerpc_debugfs_root);
1605 if (!dir)
1606 return -ENOMEM;
1607
1608 d = debugfs_create_u32("do_warn", S_IRUGO | S_IWUSR, dir,
1609 &ppc_warn_emulated);
1610 if (!d)
1611 goto fail;
1612
1613 for (i = 0; i < sizeof(ppc_emulated)/sizeof(*entries); i++) {
1614 d = debugfs_create_u32(entries[i].name, S_IRUGO | S_IWUSR, dir,
1615 (u32 *)&entries[i].val.counter);
1616 if (!d)
1617 goto fail;
1618 }
1619
1620 return 0;
1621
1622 fail:
1623 debugfs_remove_recursive(dir);
1624 return -ENOMEM;
1625 }
1626
1627 device_initcall(ppc_warn_emulated_init);
1628
1629 #endif /* CONFIG_PPC_EMULATED_STATS */
Linux kernel - Deliverables
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