2 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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.
9 * Modified by Cort Dougan (cort@cs.nmt.edu)
10 * and Paul Mackerras (paulus@samba.org)
14 * This file handles the architecture-dependent parts of hardware exceptions
17 #include <linux/errno.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.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/delay.h>
32 #include <linux/kprobes.h>
33 #include <linux/kexec.h>
34 #include <linux/backlight.h>
36 #include <asm/kdebug.h>
37 #include <asm/pgtable.h>
38 #include <asm/uaccess.h>
39 #include <asm/system.h>
41 #include <asm/machdep.h>
47 #ifdef CONFIG_PMAC_BACKLIGHT
48 #include <asm/backlight.h>
51 #include <asm/firmware.h>
52 #include <asm/processor.h>
54 #include <asm/kexec.h>
56 #ifdef CONFIG_PPC64 /* XXX */
57 #define _IO_BASE pci_io_base
59 cpumask_t cpus_in_sr = CPU_MASK_NONE;
63 #ifdef CONFIG_DEBUGGER
64 int (*__debugger)(struct pt_regs *regs);
65 int (*__debugger_ipi)(struct pt_regs *regs);
66 int (*__debugger_bpt)(struct pt_regs *regs);
67 int (*__debugger_sstep)(struct pt_regs *regs);
68 int (*__debugger_iabr_match)(struct pt_regs *regs);
69 int (*__debugger_dabr_match)(struct pt_regs *regs);
70 int (*__debugger_fault_handler)(struct pt_regs *regs);
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);
81 ATOMIC_NOTIFIER_HEAD(powerpc_die_chain);
83 int register_die_notifier(struct notifier_block *nb)
85 return atomic_notifier_chain_register(&powerpc_die_chain, nb);
87 EXPORT_SYMBOL(register_die_notifier);
89 int unregister_die_notifier(struct notifier_block *nb)
91 return atomic_notifier_chain_unregister(&powerpc_die_chain, nb);
93 EXPORT_SYMBOL(unregister_die_notifier);
96 * Trap & Exception support
99 static DEFINE_SPINLOCK(die_lock);
101 int die(const char *str, struct pt_regs *regs, long err)
103 static int die_counter;
109 spin_lock_irq(&die_lock);
111 #ifdef CONFIG_PMAC_BACKLIGHT
112 mutex_lock(&pmac_backlight_mutex);
113 if (machine_is(powermac) && pmac_backlight) {
114 struct backlight_properties *props;
116 down(&pmac_backlight->sem);
117 props = pmac_backlight->props;
118 props->brightness = props->max_brightness;
119 props->power = FB_BLANK_UNBLANK;
120 props->update_status(pmac_backlight);
121 up(&pmac_backlight->sem);
123 mutex_unlock(&pmac_backlight_mutex);
125 printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
126 #ifdef CONFIG_PREEMPT
130 printk("SMP NR_CPUS=%d ", NR_CPUS);
132 #ifdef CONFIG_DEBUG_PAGEALLOC
133 printk("DEBUG_PAGEALLOC ");
138 printk("%s\n", ppc_md.name ? "" : ppc_md.name);
143 spin_unlock_irq(&die_lock);
145 if (kexec_should_crash(current) ||
146 kexec_sr_activated(smp_processor_id()))
148 crash_kexec_secondary(regs);
151 panic("Fatal exception in interrupt");
154 panic("Fatal exception: panic_on_oops");
161 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
165 if (!user_mode(regs)) {
166 if (die("Exception in kernel mode", regs, signr))
170 memset(&info, 0, sizeof(info));
171 info.si_signo = signr;
173 info.si_addr = (void __user *) addr;
174 force_sig_info(signr, &info, current);
177 * Init gets no signals that it doesn't have a handler for.
178 * That's all very well, but if it has caused a synchronous
179 * exception and we ignore the resulting signal, it will just
180 * generate the same exception over and over again and we get
181 * nowhere. Better to kill it and let the kernel panic.
183 if (current->pid == 1) {
184 __sighandler_t handler;
186 spin_lock_irq(¤t->sighand->siglock);
187 handler = current->sighand->action[signr-1].sa.sa_handler;
188 spin_unlock_irq(¤t->sighand->siglock);
189 if (handler == SIG_DFL) {
190 /* init has generated a synchronous exception
191 and it doesn't have a handler for the signal */
192 printk(KERN_CRIT "init has generated signal %d "
193 "but has no handler for it\n", signr);
200 void system_reset_exception(struct pt_regs *regs)
202 /* See if any machine dependent calls */
203 if (ppc_md.system_reset_exception) {
204 if (ppc_md.system_reset_exception(regs))
209 cpu_set(smp_processor_id(), cpus_in_sr);
212 die("System Reset", regs, SIGABRT);
214 /* Must die if the interrupt is not recoverable */
215 if (!(regs->msr & MSR_RI))
216 panic("Unrecoverable System Reset");
218 /* What should we do here? We could issue a shutdown or hard reset. */
223 * I/O accesses can cause machine checks on powermacs.
224 * Check if the NIP corresponds to the address of a sync
225 * instruction for which there is an entry in the exception
227 * Note that the 601 only takes a machine check on TEA
228 * (transfer error ack) signal assertion, and does not
229 * set any of the top 16 bits of SRR1.
232 static inline int check_io_access(struct pt_regs *regs)
234 #if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
235 unsigned long msr = regs->msr;
236 const struct exception_table_entry *entry;
237 unsigned int *nip = (unsigned int *)regs->nip;
239 if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000)))
240 && (entry = search_exception_tables(regs->nip)) != NULL) {
242 * Check that it's a sync instruction, or somewhere
243 * in the twi; isync; nop sequence that inb/inw/inl uses.
244 * As the address is in the exception table
245 * we should be able to read the instr there.
246 * For the debug message, we look at the preceding
249 if (*nip == 0x60000000) /* nop */
251 else if (*nip == 0x4c00012c) /* isync */
253 if (*nip == 0x7c0004ac || (*nip >> 26) == 3) {
258 rb = (*nip >> 11) & 0x1f;
259 printk(KERN_DEBUG "%s bad port %lx at %p\n",
260 (*nip & 0x100)? "OUT to": "IN from",
261 regs->gpr[rb] - _IO_BASE, nip);
263 regs->nip = entry->fixup;
267 #endif /* CONFIG_PPC_PMAC && CONFIG_PPC32 */
271 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
272 /* On 4xx, the reason for the machine check or program exception
274 #define get_reason(regs) ((regs)->dsisr)
275 #ifndef CONFIG_FSL_BOOKE
276 #define get_mc_reason(regs) ((regs)->dsisr)
278 #define get_mc_reason(regs) (mfspr(SPRN_MCSR))
280 #define REASON_FP ESR_FP
281 #define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
282 #define REASON_PRIVILEGED ESR_PPR
283 #define REASON_TRAP ESR_PTR
285 /* single-step stuff */
286 #define single_stepping(regs) (current->thread.dbcr0 & DBCR0_IC)
287 #define clear_single_step(regs) (current->thread.dbcr0 &= ~DBCR0_IC)
290 /* On non-4xx, the reason for the machine check or program
291 exception is in the MSR. */
292 #define get_reason(regs) ((regs)->msr)
293 #define get_mc_reason(regs) ((regs)->msr)
294 #define REASON_FP 0x100000
295 #define REASON_ILLEGAL 0x80000
296 #define REASON_PRIVILEGED 0x40000
297 #define REASON_TRAP 0x20000
299 #define single_stepping(regs) ((regs)->msr & MSR_SE)
300 #define clear_single_step(regs) ((regs)->msr &= ~MSR_SE)
304 * This is "fall-back" implementation for configurations
305 * which don't provide platform-specific machine check info
307 void __attribute__ ((weak))
308 platform_machine_check(struct pt_regs *regs)
312 void machine_check_exception(struct pt_regs *regs)
315 unsigned long reason = get_mc_reason(regs);
317 /* See if any machine dependent calls */
318 if (ppc_md.machine_check_exception)
319 recover = ppc_md.machine_check_exception(regs);
324 if (user_mode(regs)) {
326 _exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
330 #if defined(CONFIG_8xx) && defined(CONFIG_PCI)
331 /* the qspan pci read routines can cause machine checks -- Cort */
332 bad_page_fault(regs, regs->dar, SIGBUS);
336 if (debugger_fault_handler(regs)) {
341 if (check_io_access(regs))
344 #if defined(CONFIG_4xx) && !defined(CONFIG_440A)
345 if (reason & ESR_IMCP) {
346 printk("Instruction");
347 mtspr(SPRN_ESR, reason & ~ESR_IMCP);
350 printk(" machine check in kernel mode.\n");
351 #elif defined(CONFIG_440A)
352 printk("Machine check in kernel mode.\n");
353 if (reason & ESR_IMCP){
354 printk("Instruction Synchronous Machine Check exception\n");
355 mtspr(SPRN_ESR, reason & ~ESR_IMCP);
358 u32 mcsr = mfspr(SPRN_MCSR);
360 printk("Instruction Read PLB Error\n");
362 printk("Data Read PLB Error\n");
364 printk("Data Write PLB Error\n");
365 if (mcsr & MCSR_TLBP)
366 printk("TLB Parity Error\n");
367 if (mcsr & MCSR_ICP){
368 flush_instruction_cache();
369 printk("I-Cache Parity Error\n");
371 if (mcsr & MCSR_DCSP)
372 printk("D-Cache Search Parity Error\n");
373 if (mcsr & MCSR_DCFP)
374 printk("D-Cache Flush Parity Error\n");
375 if (mcsr & MCSR_IMPE)
376 printk("Machine Check exception is imprecise\n");
379 mtspr(SPRN_MCSR, mcsr);
381 #elif defined (CONFIG_E500)
382 printk("Machine check in kernel mode.\n");
383 printk("Caused by (from MCSR=%lx): ", reason);
385 if (reason & MCSR_MCP)
386 printk("Machine Check Signal\n");
387 if (reason & MCSR_ICPERR)
388 printk("Instruction Cache Parity Error\n");
389 if (reason & MCSR_DCP_PERR)
390 printk("Data Cache Push Parity Error\n");
391 if (reason & MCSR_DCPERR)
392 printk("Data Cache Parity Error\n");
393 if (reason & MCSR_GL_CI)
394 printk("Guarded Load or Cache-Inhibited stwcx.\n");
395 if (reason & MCSR_BUS_IAERR)
396 printk("Bus - Instruction Address Error\n");
397 if (reason & MCSR_BUS_RAERR)
398 printk("Bus - Read Address Error\n");
399 if (reason & MCSR_BUS_WAERR)
400 printk("Bus - Write Address Error\n");
401 if (reason & MCSR_BUS_IBERR)
402 printk("Bus - Instruction Data Error\n");
403 if (reason & MCSR_BUS_RBERR)
404 printk("Bus - Read Data Bus Error\n");
405 if (reason & MCSR_BUS_WBERR)
406 printk("Bus - Read Data Bus Error\n");
407 if (reason & MCSR_BUS_IPERR)
408 printk("Bus - Instruction Parity Error\n");
409 if (reason & MCSR_BUS_RPERR)
410 printk("Bus - Read Parity Error\n");
411 #elif defined (CONFIG_E200)
412 printk("Machine check in kernel mode.\n");
413 printk("Caused by (from MCSR=%lx): ", reason);
415 if (reason & MCSR_MCP)
416 printk("Machine Check Signal\n");
417 if (reason & MCSR_CP_PERR)
418 printk("Cache Push Parity Error\n");
419 if (reason & MCSR_CPERR)
420 printk("Cache Parity Error\n");
421 if (reason & MCSR_EXCP_ERR)
422 printk("ISI, ITLB, or Bus Error on first instruction fetch for an exception handler\n");
423 if (reason & MCSR_BUS_IRERR)
424 printk("Bus - Read Bus Error on instruction fetch\n");
425 if (reason & MCSR_BUS_DRERR)
426 printk("Bus - Read Bus Error on data load\n");
427 if (reason & MCSR_BUS_WRERR)
428 printk("Bus - Write Bus Error on buffered store or cache line push\n");
429 #else /* !CONFIG_4xx && !CONFIG_E500 && !CONFIG_E200 */
430 printk("Machine check in kernel mode.\n");
431 printk("Caused by (from SRR1=%lx): ", reason);
432 switch (reason & 0x601F0000) {
434 printk("Machine check signal\n");
436 case 0: /* for 601 */
438 case 0x140000: /* 7450 MSS error and TEA */
439 printk("Transfer error ack signal\n");
442 printk("Data parity error signal\n");
445 printk("Address parity error signal\n");
448 printk("L1 Data Cache error\n");
451 printk("L1 Instruction Cache error\n");
454 printk("L2 data cache parity error\n");
457 printk("Unknown values in msr\n");
459 #endif /* CONFIG_4xx */
462 * Optional platform-provided routine to print out
463 * additional info, e.g. bus error registers.
465 platform_machine_check(regs);
467 if (debugger_fault_handler(regs))
469 die("Machine check", regs, SIGBUS);
471 /* Must die if the interrupt is not recoverable */
472 if (!(regs->msr & MSR_RI))
473 panic("Unrecoverable Machine check");
476 void SMIException(struct pt_regs *regs)
478 die("System Management Interrupt", regs, SIGABRT);
481 void unknown_exception(struct pt_regs *regs)
483 printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
484 regs->nip, regs->msr, regs->trap);
486 _exception(SIGTRAP, regs, 0, 0);
489 void instruction_breakpoint_exception(struct pt_regs *regs)
491 if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5,
492 5, SIGTRAP) == NOTIFY_STOP)
494 if (debugger_iabr_match(regs))
496 _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
499 void RunModeException(struct pt_regs *regs)
501 _exception(SIGTRAP, regs, 0, 0);
504 void __kprobes single_step_exception(struct pt_regs *regs)
506 regs->msr &= ~(MSR_SE | MSR_BE); /* Turn off 'trace' bits */
508 if (notify_die(DIE_SSTEP, "single_step", regs, 5,
509 5, SIGTRAP) == NOTIFY_STOP)
511 if (debugger_sstep(regs))
514 _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
518 * After we have successfully emulated an instruction, we have to
519 * check if the instruction was being single-stepped, and if so,
520 * pretend we got a single-step exception. This was pointed out
521 * by Kumar Gala. -- paulus
523 static void emulate_single_step(struct pt_regs *regs)
525 if (single_stepping(regs)) {
526 clear_single_step(regs);
527 _exception(SIGTRAP, regs, TRAP_TRACE, 0);
531 static void parse_fpe(struct pt_regs *regs)
536 flush_fp_to_thread(current);
538 fpscr = current->thread.fpscr.val;
540 /* Invalid operation */
541 if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
545 else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX))
549 else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX))
553 else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX))
557 else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX))
560 _exception(SIGFPE, regs, code, regs->nip);
564 * Illegal instruction emulation support. Originally written to
565 * provide the PVR to user applications using the mfspr rd, PVR.
566 * Return non-zero if we can't emulate, or -EFAULT if the associated
567 * memory access caused an access fault. Return zero on success.
569 * There are a couple of ways to do this, either "decode" the instruction
570 * or directly match lots of bits. In this case, matching lots of
571 * bits is faster and easier.
574 #define INST_MFSPR_PVR 0x7c1f42a6
575 #define INST_MFSPR_PVR_MASK 0xfc1fffff
577 #define INST_DCBA 0x7c0005ec
578 #define INST_DCBA_MASK 0x7c0007fe
580 #define INST_MCRXR 0x7c000400
581 #define INST_MCRXR_MASK 0x7c0007fe
583 #define INST_STRING 0x7c00042a
584 #define INST_STRING_MASK 0x7c0007fe
585 #define INST_STRING_GEN_MASK 0x7c00067e
586 #define INST_LSWI 0x7c0004aa
587 #define INST_LSWX 0x7c00042a
588 #define INST_STSWI 0x7c0005aa
589 #define INST_STSWX 0x7c00052a
591 static int emulate_string_inst(struct pt_regs *regs, u32 instword)
593 u8 rT = (instword >> 21) & 0x1f;
594 u8 rA = (instword >> 16) & 0x1f;
595 u8 NB_RB = (instword >> 11) & 0x1f;
600 /* Early out if we are an invalid form of lswx */
601 if ((instword & INST_STRING_MASK) == INST_LSWX)
602 if ((rT == rA) || (rT == NB_RB))
605 EA = (rA == 0) ? 0 : regs->gpr[rA];
607 switch (instword & INST_STRING_MASK) {
611 num_bytes = regs->xer & 0x7f;
615 num_bytes = (NB_RB == 0) ? 32 : NB_RB;
621 while (num_bytes != 0)
624 u32 shift = 8 * (3 - (pos & 0x3));
626 switch ((instword & INST_STRING_MASK)) {
629 if (get_user(val, (u8 __user *)EA))
631 /* first time updating this reg,
635 regs->gpr[rT] |= val << shift;
639 val = regs->gpr[rT] >> shift;
640 if (put_user(val, (u8 __user *)EA))
644 /* move EA to next address */
648 /* manage our position within the register */
659 static int emulate_instruction(struct pt_regs *regs)
664 if (!user_mode(regs) || (regs->msr & MSR_LE))
666 CHECK_FULL_REGS(regs);
668 if (get_user(instword, (u32 __user *)(regs->nip)))
671 /* Emulate the mfspr rD, PVR. */
672 if ((instword & INST_MFSPR_PVR_MASK) == INST_MFSPR_PVR) {
673 rd = (instword >> 21) & 0x1f;
674 regs->gpr[rd] = mfspr(SPRN_PVR);
678 /* Emulating the dcba insn is just a no-op. */
679 if ((instword & INST_DCBA_MASK) == INST_DCBA)
682 /* Emulate the mcrxr insn. */
683 if ((instword & INST_MCRXR_MASK) == INST_MCRXR) {
684 int shift = (instword >> 21) & 0x1c;
685 unsigned long msk = 0xf0000000UL >> shift;
687 regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk);
688 regs->xer &= ~0xf0000000UL;
692 /* Emulate load/store string insn. */
693 if ((instword & INST_STRING_GEN_MASK) == INST_STRING)
694 return emulate_string_inst(regs, instword);
700 * Look through the list of trap instructions that are used for BUG(),
701 * BUG_ON() and WARN_ON() and see if we hit one. At this point we know
702 * that the exception was caused by a trap instruction of some kind.
703 * Returns 1 if we should continue (i.e. it was a WARN_ON) or 0
706 extern struct bug_entry __start___bug_table[], __stop___bug_table[];
708 #ifndef CONFIG_MODULES
709 #define module_find_bug(x) NULL
712 struct bug_entry *find_bug(unsigned long bugaddr)
714 struct bug_entry *bug;
716 for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
717 if (bugaddr == bug->bug_addr)
719 return module_find_bug(bugaddr);
722 static int check_bug_trap(struct pt_regs *regs)
724 struct bug_entry *bug;
727 if (regs->msr & MSR_PR)
728 return 0; /* not in kernel */
729 addr = regs->nip; /* address of trap instruction */
730 if (addr < PAGE_OFFSET)
732 bug = find_bug(regs->nip);
735 if (bug->line & BUG_WARNING_TRAP) {
736 /* this is a WARN_ON rather than BUG/BUG_ON */
737 printk(KERN_ERR "Badness in %s at %s:%ld\n",
738 bug->function, bug->file,
739 bug->line & ~BUG_WARNING_TRAP);
743 printk(KERN_CRIT "kernel BUG in %s at %s:%ld!\n",
744 bug->function, bug->file, bug->line);
749 void __kprobes program_check_exception(struct pt_regs *regs)
751 unsigned int reason = get_reason(regs);
752 extern int do_mathemu(struct pt_regs *regs);
754 #ifdef CONFIG_MATH_EMULATION
755 /* (reason & REASON_ILLEGAL) would be the obvious thing here,
756 * but there seems to be a hardware bug on the 405GP (RevD)
757 * that means ESR is sometimes set incorrectly - either to
758 * ESR_DST (!?) or 0. In the process of chasing this with the
759 * hardware people - not sure if it can happen on any illegal
760 * instruction or only on FP instructions, whether there is a
761 * pattern to occurences etc. -dgibson 31/Mar/2003 */
762 if (!(reason & REASON_TRAP) && do_mathemu(regs) == 0) {
763 emulate_single_step(regs);
766 #endif /* CONFIG_MATH_EMULATION */
768 if (reason & REASON_FP) {
769 /* IEEE FP exception */
773 if (reason & REASON_TRAP) {
775 if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP)
778 if (debugger_bpt(regs))
780 if (check_bug_trap(regs)) {
784 _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
790 /* Try to emulate it if we should. */
791 if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
792 switch (emulate_instruction(regs)) {
795 emulate_single_step(regs);
798 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
803 if (reason & REASON_PRIVILEGED)
804 _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
806 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
809 void alignment_exception(struct pt_regs *regs)
813 /* we don't implement logging of alignment exceptions */
814 if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS))
815 fixed = fix_alignment(regs);
818 regs->nip += 4; /* skip over emulated instruction */
819 emulate_single_step(regs);
823 /* Operand address was bad */
824 if (fixed == -EFAULT) {
826 _exception(SIGSEGV, regs, SEGV_ACCERR, regs->dar);
828 /* Search exception table */
829 bad_page_fault(regs, regs->dar, SIGSEGV);
832 _exception(SIGBUS, regs, BUS_ADRALN, regs->dar);
835 void StackOverflow(struct pt_regs *regs)
837 printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",
838 current, regs->gpr[1]);
841 panic("kernel stack overflow");
844 void nonrecoverable_exception(struct pt_regs *regs)
846 printk(KERN_ERR "Non-recoverable exception at PC=%lx MSR=%lx\n",
847 regs->nip, regs->msr);
849 die("nonrecoverable exception", regs, SIGKILL);
852 void trace_syscall(struct pt_regs *regs)
854 printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n",
855 current, current->pid, regs->nip, regs->link, regs->gpr[0],
856 regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted());
859 void kernel_fp_unavailable_exception(struct pt_regs *regs)
861 printk(KERN_EMERG "Unrecoverable FP Unavailable Exception "
862 "%lx at %lx\n", regs->trap, regs->nip);
863 die("Unrecoverable FP Unavailable Exception", regs, SIGABRT);
866 void altivec_unavailable_exception(struct pt_regs *regs)
868 #if !defined(CONFIG_ALTIVEC)
869 if (user_mode(regs)) {
870 /* A user program has executed an altivec instruction,
871 but this kernel doesn't support altivec. */
872 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
876 printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
877 "%lx at %lx\n", regs->trap, regs->nip);
878 die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
881 void performance_monitor_exception(struct pt_regs *regs)
887 void SoftwareEmulation(struct pt_regs *regs)
889 extern int do_mathemu(struct pt_regs *);
890 extern int Soft_emulate_8xx(struct pt_regs *);
893 CHECK_FULL_REGS(regs);
895 if (!user_mode(regs)) {
897 die("Kernel Mode Software FPU Emulation", regs, SIGFPE);
900 #ifdef CONFIG_MATH_EMULATION
901 errcode = do_mathemu(regs);
903 errcode = Soft_emulate_8xx(regs);
907 _exception(SIGFPE, regs, 0, 0);
908 else if (errcode == -EFAULT)
909 _exception(SIGSEGV, regs, 0, 0);
911 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
913 emulate_single_step(regs);
915 #endif /* CONFIG_8xx */
917 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
919 void DebugException(struct pt_regs *regs, unsigned long debug_status)
921 if (debug_status & DBSR_IC) { /* instruction completion */
922 regs->msr &= ~MSR_DE;
923 if (user_mode(regs)) {
924 current->thread.dbcr0 &= ~DBCR0_IC;
926 /* Disable instruction completion */
927 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
928 /* Clear the instruction completion event */
929 mtspr(SPRN_DBSR, DBSR_IC);
930 if (debugger_sstep(regs))
933 _exception(SIGTRAP, regs, TRAP_TRACE, 0);
936 #endif /* CONFIG_4xx || CONFIG_BOOKE */
938 #if !defined(CONFIG_TAU_INT)
939 void TAUException(struct pt_regs *regs)
941 printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
942 regs->nip, regs->msr, regs->trap, print_tainted());
944 #endif /* CONFIG_INT_TAU */
946 #ifdef CONFIG_ALTIVEC
947 void altivec_assist_exception(struct pt_regs *regs)
951 if (!user_mode(regs)) {
952 printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode"
953 " at %lx\n", regs->nip);
954 die("Kernel VMX/Altivec assist exception", regs, SIGILL);
957 flush_altivec_to_thread(current);
959 err = emulate_altivec(regs);
961 regs->nip += 4; /* skip emulated instruction */
962 emulate_single_step(regs);
966 if (err == -EFAULT) {
967 /* got an error reading the instruction */
968 _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
970 /* didn't recognize the instruction */
971 /* XXX quick hack for now: set the non-Java bit in the VSCR */
972 if (printk_ratelimit())
973 printk(KERN_ERR "Unrecognized altivec instruction "
974 "in %s at %lx\n", current->comm, regs->nip);
975 current->thread.vscr.u[3] |= 0x10000;
978 #endif /* CONFIG_ALTIVEC */
980 #ifdef CONFIG_FSL_BOOKE
981 void CacheLockingException(struct pt_regs *regs, unsigned long address,
982 unsigned long error_code)
984 /* We treat cache locking instructions from the user
985 * as priv ops, in the future we could try to do
988 if (error_code & (ESR_DLK|ESR_ILK))
989 _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
992 #endif /* CONFIG_FSL_BOOKE */
995 void SPEFloatingPointException(struct pt_regs *regs)
997 unsigned long spefscr;
1001 spefscr = current->thread.spefscr;
1002 fpexc_mode = current->thread.fpexc_mode;
1004 /* Hardware does not neccessarily set sticky
1005 * underflow/overflow/invalid flags */
1006 if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) {
1008 spefscr |= SPEFSCR_FOVFS;
1010 else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) {
1012 spefscr |= SPEFSCR_FUNFS;
1014 else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV))
1016 else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) {
1018 spefscr |= SPEFSCR_FINVS;
1020 else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES))
1023 current->thread.spefscr = spefscr;
1025 _exception(SIGFPE, regs, code, regs->nip);
1031 * We enter here if we get an unrecoverable exception, that is, one
1032 * that happened at a point where the RI (recoverable interrupt) bit
1033 * in the MSR is 0. This indicates that SRR0/1 are live, and that
1034 * we therefore lost state by taking this exception.
1036 void unrecoverable_exception(struct pt_regs *regs)
1038 printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n",
1039 regs->trap, regs->nip);
1040 die("Unrecoverable exception", regs, SIGABRT);
1043 #ifdef CONFIG_BOOKE_WDT
1045 * Default handler for a Watchdog exception,
1046 * spins until a reboot occurs
1048 void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs)
1050 /* Generic WatchdogHandler, implement your own */
1051 mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE));
1055 void WatchdogException(struct pt_regs *regs)
1057 printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n");
1058 WatchdogHandler(regs);
1063 * We enter here if we discover during exception entry that we are
1064 * running in supervisor mode with a userspace value in the stack pointer.
1066 void kernel_bad_stack(struct pt_regs *regs)
1068 printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n",
1069 regs->gpr[1], regs->nip);
1070 die("Bad kernel stack pointer", regs, SIGABRT);
1073 void __init trap_init(void)