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-rw-r--r--arch/ppc/kernel/traps.c826
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diff --git a/arch/ppc/kernel/traps.c b/arch/ppc/kernel/traps.c
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1/*
2 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Modified by Cort Dougan (cort@cs.nmt.edu)
10 * and Paul Mackerras (paulus@cs.anu.edu.au)
11 */
12
13/*
14 * This file handles the architecture-dependent parts of hardware exceptions
15 */
16
17#include <linux/errno.h>
18#include <linux/sched.h>
19#include <linux/kernel.h>
20#include <linux/mm.h>
21#include <linux/stddef.h>
22#include <linux/unistd.h>
23#include <linux/ptrace.h>
24#include <linux/slab.h>
25#include <linux/user.h>
26#include <linux/a.out.h>
27#include <linux/interrupt.h>
28#include <linux/init.h>
29#include <linux/module.h>
30#include <linux/prctl.h>
31#include <linux/bug.h>
32
33#include <asm/pgtable.h>
34#include <asm/uaccess.h>
35#include <asm/system.h>
36#include <asm/io.h>
37#include <asm/reg.h>
38#include <asm/xmon.h>
39#include <asm/pmc.h>
40
41#ifdef CONFIG_XMON
42extern int xmon_bpt(struct pt_regs *regs);
43extern int xmon_sstep(struct pt_regs *regs);
44extern int xmon_iabr_match(struct pt_regs *regs);
45extern int xmon_dabr_match(struct pt_regs *regs);
46
47int (*debugger)(struct pt_regs *regs) = xmon;
48int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
49int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
50int (*debugger_iabr_match)(struct pt_regs *regs) = xmon_iabr_match;
51int (*debugger_dabr_match)(struct pt_regs *regs) = xmon_dabr_match;
52void (*debugger_fault_handler)(struct pt_regs *regs);
53#else
54#ifdef CONFIG_KGDB
55int (*debugger)(struct pt_regs *regs);
56int (*debugger_bpt)(struct pt_regs *regs);
57int (*debugger_sstep)(struct pt_regs *regs);
58int (*debugger_iabr_match)(struct pt_regs *regs);
59int (*debugger_dabr_match)(struct pt_regs *regs);
60void (*debugger_fault_handler)(struct pt_regs *regs);
61#else
62#define debugger(regs) do { } while (0)
63#define debugger_bpt(regs) 0
64#define debugger_sstep(regs) 0
65#define debugger_iabr_match(regs) 0
66#define debugger_dabr_match(regs) 0
67#define debugger_fault_handler ((void (*)(struct pt_regs *))0)
68#endif
69#endif
70
71/*
72 * Trap & Exception support
73 */
74
75DEFINE_SPINLOCK(die_lock);
76
77int die(const char * str, struct pt_regs * fp, long err)
78{
79 static int die_counter;
80 int nl = 0;
81 console_verbose();
82 spin_lock_irq(&die_lock);
83 printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
84#ifdef CONFIG_PREEMPT
85 printk("PREEMPT ");
86 nl = 1;
87#endif
88#ifdef CONFIG_SMP
89 printk("SMP NR_CPUS=%d ", NR_CPUS);
90 nl = 1;
91#endif
92 if (nl)
93 printk("\n");
94 show_regs(fp);
95 add_taint(TAINT_DIE);
96 spin_unlock_irq(&die_lock);
97 /* do_exit() should take care of panic'ing from an interrupt
98 * context so we don't handle it here
99 */
100 do_exit(err);
101}
102
103void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
104{
105 siginfo_t info;
106
107 if (!user_mode(regs)) {
108 debugger(regs);
109 die("Exception in kernel mode", regs, signr);
110 }
111 info.si_signo = signr;
112 info.si_errno = 0;
113 info.si_code = code;
114 info.si_addr = (void __user *) addr;
115 force_sig_info(signr, &info, current);
116
117 /*
118 * Init gets no signals that it doesn't have a handler for.
119 * That's all very well, but if it has caused a synchronous
120 * exception and we ignore the resulting signal, it will just
121 * generate the same exception over and over again and we get
122 * nowhere. Better to kill it and let the kernel panic.
123 */
124 if (is_global_init(current)) {
125 __sighandler_t handler;
126
127 spin_lock_irq(&current->sighand->siglock);
128 handler = current->sighand->action[signr-1].sa.sa_handler;
129 spin_unlock_irq(&current->sighand->siglock);
130 if (handler == SIG_DFL) {
131 /* init has generated a synchronous exception
132 and it doesn't have a handler for the signal */
133 printk(KERN_CRIT "init has generated signal %d "
134 "but has no handler for it\n", signr);
135 do_exit(signr);
136 }
137 }
138}
139
140/*
141 * I/O accesses can cause machine checks on powermacs.
142 * Check if the NIP corresponds to the address of a sync
143 * instruction for which there is an entry in the exception
144 * table.
145 * Note that the 601 only takes a machine check on TEA
146 * (transfer error ack) signal assertion, and does not
147 * set any of the top 16 bits of SRR1.
148 * -- paulus.
149 */
150static inline int check_io_access(struct pt_regs *regs)
151{
152#if defined CONFIG_8xx
153 unsigned long msr = regs->msr;
154 const struct exception_table_entry *entry;
155 unsigned int *nip = (unsigned int *)regs->nip;
156
157 if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000)))
158 && (entry = search_exception_tables(regs->nip)) != NULL) {
159 /*
160 * Check that it's a sync instruction, or somewhere
161 * in the twi; isync; nop sequence that inb/inw/inl uses.
162 * As the address is in the exception table
163 * we should be able to read the instr there.
164 * For the debug message, we look at the preceding
165 * load or store.
166 */
167 if (*nip == 0x60000000) /* nop */
168 nip -= 2;
169 else if (*nip == 0x4c00012c) /* isync */
170 --nip;
171 /* eieio from I/O string functions */
172 else if ((*nip) == 0x7c0006ac || *(nip+1) == 0x7c0006ac)
173 nip += 2;
174 if (*nip == 0x7c0004ac || (*nip >> 26) == 3 ||
175 (*(nip+1) >> 26) == 3) {
176 /* sync or twi */
177 unsigned int rb;
178
179 --nip;
180 rb = (*nip >> 11) & 0x1f;
181 printk(KERN_DEBUG "%s bad port %lx at %p\n",
182 (*nip & 0x100)? "OUT to": "IN from",
183 regs->gpr[rb] - _IO_BASE, nip);
184 regs->msr |= MSR_RI;
185 regs->nip = entry->fixup;
186 return 1;
187 }
188 }
189#endif /* CONFIG_8xx */
190 return 0;
191}
192
193#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
194/* On 4xx, the reason for the machine check or program exception
195 is in the ESR. */
196#define get_reason(regs) ((regs)->dsisr)
197#define get_mc_reason(regs) ((regs)->dsisr)
198#define REASON_FP ESR_FP
199#define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
200#define REASON_PRIVILEGED ESR_PPR
201#define REASON_TRAP ESR_PTR
202
203/* single-step stuff */
204#define single_stepping(regs) (current->thread.dbcr0 & DBCR0_IC)
205#define clear_single_step(regs) (current->thread.dbcr0 &= ~DBCR0_IC)
206
207#else
208/* On non-4xx, the reason for the machine check or program
209 exception is in the MSR. */
210#define get_reason(regs) ((regs)->msr)
211#define get_mc_reason(regs) ((regs)->msr)
212#define REASON_FP 0x100000
213#define REASON_ILLEGAL 0x80000
214#define REASON_PRIVILEGED 0x40000
215#define REASON_TRAP 0x20000
216
217#define single_stepping(regs) ((regs)->msr & MSR_SE)
218#define clear_single_step(regs) ((regs)->msr &= ~MSR_SE)
219#endif
220
221/*
222 * This is "fall-back" implementation for configurations
223 * which don't provide platform-specific machine check info
224 */
225void __attribute__ ((weak))
226platform_machine_check(struct pt_regs *regs)
227{
228}
229
230#if defined(CONFIG_4xx)
231int machine_check_4xx(struct pt_regs *regs)
232{
233 unsigned long reason = get_mc_reason(regs);
234
235 if (reason & ESR_IMCP) {
236 printk("Instruction");
237 mtspr(SPRN_ESR, reason & ~ESR_IMCP);
238 } else
239 printk("Data");
240 printk(" machine check in kernel mode.\n");
241
242 return 0;
243}
244
245int machine_check_440A(struct pt_regs *regs)
246{
247 unsigned long reason = get_mc_reason(regs);
248
249 printk("Machine check in kernel mode.\n");
250 if (reason & ESR_IMCP){
251 printk("Instruction Synchronous Machine Check exception\n");
252 mtspr(SPRN_ESR, reason & ~ESR_IMCP);
253 }
254 else {
255 u32 mcsr = mfspr(SPRN_MCSR);
256 if (mcsr & MCSR_IB)
257 printk("Instruction Read PLB Error\n");
258 if (mcsr & MCSR_DRB)
259 printk("Data Read PLB Error\n");
260 if (mcsr & MCSR_DWB)
261 printk("Data Write PLB Error\n");
262 if (mcsr & MCSR_TLBP)
263 printk("TLB Parity Error\n");
264 if (mcsr & MCSR_ICP){
265 flush_instruction_cache();
266 printk("I-Cache Parity Error\n");
267 }
268 if (mcsr & MCSR_DCSP)
269 printk("D-Cache Search Parity Error\n");
270 if (mcsr & MCSR_DCFP)
271 printk("D-Cache Flush Parity Error\n");
272 if (mcsr & MCSR_IMPE)
273 printk("Machine Check exception is imprecise\n");
274
275 /* Clear MCSR */
276 mtspr(SPRN_MCSR, mcsr);
277 }
278 return 0;
279}
280#else
281int machine_check_generic(struct pt_regs *regs)
282{
283 unsigned long reason = get_mc_reason(regs);
284
285 printk("Machine check in kernel mode.\n");
286 printk("Caused by (from SRR1=%lx): ", reason);
287 switch (reason & 0x601F0000) {
288 case 0x80000:
289 printk("Machine check signal\n");
290 break;
291 case 0: /* for 601 */
292 case 0x40000:
293 case 0x140000: /* 7450 MSS error and TEA */
294 printk("Transfer error ack signal\n");
295 break;
296 case 0x20000:
297 printk("Data parity error signal\n");
298 break;
299 case 0x10000:
300 printk("Address parity error signal\n");
301 break;
302 case 0x20000000:
303 printk("L1 Data Cache error\n");
304 break;
305 case 0x40000000:
306 printk("L1 Instruction Cache error\n");
307 break;
308 case 0x00100000:
309 printk("L2 data cache parity error\n");
310 break;
311 default:
312 printk("Unknown values in msr\n");
313 }
314 return 0;
315}
316#endif /* everything else */
317
318void machine_check_exception(struct pt_regs *regs)
319{
320 int recover = 0;
321
322 if (cur_cpu_spec->machine_check)
323 recover = cur_cpu_spec->machine_check(regs);
324 if (recover > 0)
325 return;
326
327 if (user_mode(regs)) {
328 regs->msr |= MSR_RI;
329 _exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
330 return;
331 }
332
333#if defined(CONFIG_8xx) && defined(CONFIG_PCI)
334 /* the qspan pci read routines can cause machine checks -- Cort */
335 bad_page_fault(regs, regs->dar, SIGBUS);
336 return;
337#endif
338
339 if (debugger_fault_handler) {
340 debugger_fault_handler(regs);
341 regs->msr |= MSR_RI;
342 return;
343 }
344
345 if (check_io_access(regs))
346 return;
347
348 /*
349 * Optional platform-provided routine to print out
350 * additional info, e.g. bus error registers.
351 */
352 platform_machine_check(regs);
353
354 debugger(regs);
355 die("machine check", regs, SIGBUS);
356}
357
358void SMIException(struct pt_regs *regs)
359{
360 debugger(regs);
361#if !(defined(CONFIG_XMON) || defined(CONFIG_KGDB))
362 show_regs(regs);
363 panic("System Management Interrupt");
364#endif
365}
366
367void unknown_exception(struct pt_regs *regs)
368{
369 printk("Bad trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
370 regs->nip, regs->msr, regs->trap, print_tainted());
371 _exception(SIGTRAP, regs, 0, 0);
372}
373
374void instruction_breakpoint_exception(struct pt_regs *regs)
375{
376 if (debugger_iabr_match(regs))
377 return;
378 _exception(SIGTRAP, regs, TRAP_BRKPT, 0);
379}
380
381void RunModeException(struct pt_regs *regs)
382{
383 _exception(SIGTRAP, regs, 0, 0);
384}
385
386/* Illegal instruction emulation support. Originally written to
387 * provide the PVR to user applications using the mfspr rd, PVR.
388 * Return non-zero if we can't emulate, or -EFAULT if the associated
389 * memory access caused an access fault. Return zero on success.
390 *
391 * There are a couple of ways to do this, either "decode" the instruction
392 * or directly match lots of bits. In this case, matching lots of
393 * bits is faster and easier.
394 *
395 */
396#define INST_MFSPR_PVR 0x7c1f42a6
397#define INST_MFSPR_PVR_MASK 0xfc1fffff
398
399#define INST_DCBA 0x7c0005ec
400#define INST_DCBA_MASK 0x7c0007fe
401
402#define INST_MCRXR 0x7c000400
403#define INST_MCRXR_MASK 0x7c0007fe
404
405#define INST_STRING 0x7c00042a
406#define INST_STRING_MASK 0x7c0007fe
407#define INST_STRING_GEN_MASK 0x7c00067e
408#define INST_LSWI 0x7c0004aa
409#define INST_LSWX 0x7c00042a
410#define INST_STSWI 0x7c0005aa
411#define INST_STSWX 0x7c00052a
412
413static int emulate_string_inst(struct pt_regs *regs, u32 instword)
414{
415 u8 rT = (instword >> 21) & 0x1f;
416 u8 rA = (instword >> 16) & 0x1f;
417 u8 NB_RB = (instword >> 11) & 0x1f;
418 u32 num_bytes;
419 unsigned long EA;
420 int pos = 0;
421
422 /* Early out if we are an invalid form of lswx */
423 if ((instword & INST_STRING_MASK) == INST_LSWX)
424 if ((rT == rA) || (rT == NB_RB))
425 return -EINVAL;
426
427 EA = (rA == 0) ? 0 : regs->gpr[rA];
428
429 switch (instword & INST_STRING_MASK) {
430 case INST_LSWX:
431 case INST_STSWX:
432 EA += NB_RB;
433 num_bytes = regs->xer & 0x7f;
434 break;
435 case INST_LSWI:
436 case INST_STSWI:
437 num_bytes = (NB_RB == 0) ? 32 : NB_RB;
438 break;
439 default:
440 return -EINVAL;
441 }
442
443 while (num_bytes != 0)
444 {
445 u8 val;
446 u32 shift = 8 * (3 - (pos & 0x3));
447
448 switch ((instword & INST_STRING_MASK)) {
449 case INST_LSWX:
450 case INST_LSWI:
451 if (get_user(val, (u8 __user *)EA))
452 return -EFAULT;
453 /* first time updating this reg,
454 * zero it out */
455 if (pos == 0)
456 regs->gpr[rT] = 0;
457 regs->gpr[rT] |= val << shift;
458 break;
459 case INST_STSWI:
460 case INST_STSWX:
461 val = regs->gpr[rT] >> shift;
462 if (put_user(val, (u8 __user *)EA))
463 return -EFAULT;
464 break;
465 }
466 /* move EA to next address */
467 EA += 1;
468 num_bytes--;
469
470 /* manage our position within the register */
471 if (++pos == 4) {
472 pos = 0;
473 if (++rT == 32)
474 rT = 0;
475 }
476 }
477
478 return 0;
479}
480
481static int emulate_instruction(struct pt_regs *regs)
482{
483 u32 instword;
484 u32 rd;
485
486 if (!user_mode(regs))
487 return -EINVAL;
488 CHECK_FULL_REGS(regs);
489
490 if (get_user(instword, (u32 __user *)(regs->nip)))
491 return -EFAULT;
492
493 /* Emulate the mfspr rD, PVR.
494 */
495 if ((instword & INST_MFSPR_PVR_MASK) == INST_MFSPR_PVR) {
496 rd = (instword >> 21) & 0x1f;
497 regs->gpr[rd] = mfspr(SPRN_PVR);
498 return 0;
499 }
500
501 /* Emulating the dcba insn is just a no-op. */
502 if ((instword & INST_DCBA_MASK) == INST_DCBA)
503 return 0;
504
505 /* Emulate the mcrxr insn. */
506 if ((instword & INST_MCRXR_MASK) == INST_MCRXR) {
507 int shift = (instword >> 21) & 0x1c;
508 unsigned long msk = 0xf0000000UL >> shift;
509
510 regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk);
511 regs->xer &= ~0xf0000000UL;
512 return 0;
513 }
514
515 /* Emulate load/store string insn. */
516 if ((instword & INST_STRING_GEN_MASK) == INST_STRING)
517 return emulate_string_inst(regs, instword);
518
519 return -EINVAL;
520}
521
522/*
523 * After we have successfully emulated an instruction, we have to
524 * check if the instruction was being single-stepped, and if so,
525 * pretend we got a single-step exception. This was pointed out
526 * by Kumar Gala. -- paulus
527 */
528static void emulate_single_step(struct pt_regs *regs)
529{
530 if (single_stepping(regs)) {
531 clear_single_step(regs);
532 _exception(SIGTRAP, regs, TRAP_TRACE, 0);
533 }
534}
535
536int is_valid_bugaddr(unsigned long addr)
537{
538 return addr >= PAGE_OFFSET;
539}
540
541void program_check_exception(struct pt_regs *regs)
542{
543 unsigned int reason = get_reason(regs);
544 extern int do_mathemu(struct pt_regs *regs);
545
546#ifdef CONFIG_MATH_EMULATION
547 /* (reason & REASON_ILLEGAL) would be the obvious thing here,
548 * but there seems to be a hardware bug on the 405GP (RevD)
549 * that means ESR is sometimes set incorrectly - either to
550 * ESR_DST (!?) or 0. In the process of chasing this with the
551 * hardware people - not sure if it can happen on any illegal
552 * instruction or only on FP instructions, whether there is a
553 * pattern to occurrences etc. -dgibson 31/Mar/2003 */
554 if (!(reason & REASON_TRAP) && do_mathemu(regs) == 0) {
555 emulate_single_step(regs);
556 return;
557 }
558#endif /* CONFIG_MATH_EMULATION */
559
560 if (reason & REASON_FP) {
561 /* IEEE FP exception */
562 int code = 0;
563 u32 fpscr;
564
565 /* We must make sure the FP state is consistent with
566 * our MSR_FP in regs
567 */
568 preempt_disable();
569 if (regs->msr & MSR_FP)
570 giveup_fpu(current);
571 preempt_enable();
572
573 fpscr = current->thread.fpscr.val;
574 fpscr &= fpscr << 22; /* mask summary bits with enables */
575 if (fpscr & FPSCR_VX)
576 code = FPE_FLTINV;
577 else if (fpscr & FPSCR_OX)
578 code = FPE_FLTOVF;
579 else if (fpscr & FPSCR_UX)
580 code = FPE_FLTUND;
581 else if (fpscr & FPSCR_ZX)
582 code = FPE_FLTDIV;
583 else if (fpscr & FPSCR_XX)
584 code = FPE_FLTRES;
585 _exception(SIGFPE, regs, code, regs->nip);
586 return;
587 }
588
589 if (reason & REASON_TRAP) {
590 /* trap exception */
591 if (debugger_bpt(regs))
592 return;
593
594 if (!(regs->msr & MSR_PR) && /* not user-mode */
595 report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
596 regs->nip += 4;
597 return;
598 }
599 _exception(SIGTRAP, regs, TRAP_BRKPT, 0);
600 return;
601 }
602
603 /* Try to emulate it if we should. */
604 if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
605 switch (emulate_instruction(regs)) {
606 case 0:
607 regs->nip += 4;
608 emulate_single_step(regs);
609 return;
610 case -EFAULT:
611 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
612 return;
613 }
614 }
615
616 if (reason & REASON_PRIVILEGED)
617 _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
618 else
619 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
620}
621
622void single_step_exception(struct pt_regs *regs)
623{
624 regs->msr &= ~(MSR_SE | MSR_BE); /* Turn off 'trace' bits */
625 if (debugger_sstep(regs))
626 return;
627 _exception(SIGTRAP, regs, TRAP_TRACE, 0);
628}
629
630void alignment_exception(struct pt_regs *regs)
631{
632 int sig, code, fixed = 0;
633
634 fixed = fix_alignment(regs);
635 if (fixed == 1) {
636 regs->nip += 4; /* skip over emulated instruction */
637 emulate_single_step(regs);
638 return;
639 }
640 if (fixed == -EFAULT) {
641 sig = SIGSEGV;
642 code = SEGV_ACCERR;
643 } else {
644 sig = SIGBUS;
645 code = BUS_ADRALN;
646 }
647 if (user_mode(regs))
648 _exception(sig, regs, code, regs->dar);
649 else
650 bad_page_fault(regs, regs->dar, sig);
651}
652
653void StackOverflow(struct pt_regs *regs)
654{
655 printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",
656 current, regs->gpr[1]);
657 debugger(regs);
658 show_regs(regs);
659 panic("kernel stack overflow");
660}
661
662void nonrecoverable_exception(struct pt_regs *regs)
663{
664 printk(KERN_ERR "Non-recoverable exception at PC=%lx MSR=%lx\n",
665 regs->nip, regs->msr);
666 debugger(regs);
667 die("nonrecoverable exception", regs, SIGKILL);
668}
669
670void trace_syscall(struct pt_regs *regs)
671{
672 printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n",
673 current, current->pid, regs->nip, regs->link, regs->gpr[0],
674 regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted());
675}
676
677#ifdef CONFIG_8xx
678void SoftwareEmulation(struct pt_regs *regs)
679{
680 extern int do_mathemu(struct pt_regs *);
681 extern int Soft_emulate_8xx(struct pt_regs *);
682 int errcode;
683
684 CHECK_FULL_REGS(regs);
685
686 if (!user_mode(regs)) {
687 debugger(regs);
688 die("Kernel Mode Software FPU Emulation", regs, SIGFPE);
689 }
690
691#ifdef CONFIG_MATH_EMULATION
692 errcode = do_mathemu(regs);
693#else
694 errcode = Soft_emulate_8xx(regs);
695#endif
696 if (errcode) {
697 if (errcode > 0)
698 _exception(SIGFPE, regs, 0, 0);
699 else if (errcode == -EFAULT)
700 _exception(SIGSEGV, regs, 0, 0);
701 else
702 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
703 } else
704 emulate_single_step(regs);
705}
706#endif /* CONFIG_8xx */
707
708#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
709
710void DebugException(struct pt_regs *regs, unsigned long debug_status)
711{
712 if (debug_status & DBSR_IC) { /* instruction completion */
713 regs->msr &= ~MSR_DE;
714 if (user_mode(regs)) {
715 current->thread.dbcr0 &= ~DBCR0_IC;
716 } else {
717 /* Disable instruction completion */
718 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
719 /* Clear the instruction completion event */
720 mtspr(SPRN_DBSR, DBSR_IC);
721 if (debugger_sstep(regs))
722 return;
723 }
724 _exception(SIGTRAP, regs, TRAP_TRACE, 0);
725 }
726}
727#endif /* CONFIG_4xx || CONFIG_BOOKE */
728
729#if !defined(CONFIG_TAU_INT)
730void TAUException(struct pt_regs *regs)
731{
732 printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
733 regs->nip, regs->msr, regs->trap, print_tainted());
734}
735#endif /* CONFIG_INT_TAU */
736
737/*
738 * FP unavailable trap from kernel - print a message, but let
739 * the task use FP in the kernel until it returns to user mode.
740 */
741void kernel_fp_unavailable_exception(struct pt_regs *regs)
742{
743 regs->msr |= MSR_FP;
744 printk(KERN_ERR "floating point used in kernel (task=%p, pc=%lx)\n",
745 current, regs->nip);
746}
747
748void altivec_unavailable_exception(struct pt_regs *regs)
749{
750 static int kernel_altivec_count;
751
752#ifndef CONFIG_ALTIVEC
753 if (user_mode(regs)) {
754 /* A user program has executed an altivec instruction,
755 but this kernel doesn't support altivec. */
756 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
757 return;
758 }
759#endif
760 /* The kernel has executed an altivec instruction without
761 first enabling altivec. Whinge but let it do it. */
762 if (++kernel_altivec_count < 10)
763 printk(KERN_ERR "AltiVec used in kernel (task=%p, pc=%lx)\n",
764 current, regs->nip);
765 regs->msr |= MSR_VEC;
766}
767
768#ifdef CONFIG_ALTIVEC
769void altivec_assist_exception(struct pt_regs *regs)
770{
771 int err;
772
773 preempt_disable();
774 if (regs->msr & MSR_VEC)
775 giveup_altivec(current);
776 preempt_enable();
777 if (!user_mode(regs)) {
778 printk(KERN_ERR "altivec assist exception in kernel mode"
779 " at %lx\n", regs->nip);
780 debugger(regs);
781 die("altivec assist exception", regs, SIGFPE);
782 return;
783 }
784
785 err = emulate_altivec(regs);
786 if (err == 0) {
787 regs->nip += 4; /* skip emulated instruction */
788 emulate_single_step(regs);
789 return;
790 }
791
792 if (err == -EFAULT) {
793 /* got an error reading the instruction */
794 _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
795 } else {
796 /* didn't recognize the instruction */
797 /* XXX quick hack for now: set the non-Java bit in the VSCR */
798 printk(KERN_ERR "unrecognized altivec instruction "
799 "in %s at %lx\n", current->comm, regs->nip);
800 current->thread.vscr.u[3] |= 0x10000;
801 }
802}
803#endif /* CONFIG_ALTIVEC */
804
805#ifdef CONFIG_BOOKE_WDT
806/*
807 * Default handler for a Watchdog exception,
808 * spins until a reboot occurs
809 */
810void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs)
811{
812 /* Generic WatchdogHandler, implement your own */
813 mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE));
814 return;
815}
816
817void WatchdogException(struct pt_regs *regs)
818{
819 printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n");
820 WatchdogHandler(regs);
821}
822#endif
823
824void __init trap_init(void)
825{
826}
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