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>
35 #include <linux/bug.h>
36 #include <linux/kdebug.h>
38 #include <asm/pgtable.h>
39 #include <asm/uaccess.h>
40 #include <asm/system.h>
42 #include <asm/machdep.h>
48 #ifdef CONFIG_PMAC_BACKLIGHT
49 #include <asm/backlight.h>
52 #include <asm/firmware.h>
53 #include <asm/processor.h>
55 #include <asm/kexec.h>
57 #ifdef CONFIG_DEBUGGER
58 int (*__debugger
)(struct pt_regs
*regs
);
59 int (*__debugger_ipi
)(struct pt_regs
*regs
);
60 int (*__debugger_bpt
)(struct pt_regs
*regs
);
61 int (*__debugger_sstep
)(struct pt_regs
*regs
);
62 int (*__debugger_iabr_match
)(struct pt_regs
*regs
);
63 int (*__debugger_dabr_match
)(struct pt_regs
*regs
);
64 int (*__debugger_fault_handler
)(struct pt_regs
*regs
);
66 EXPORT_SYMBOL(__debugger
);
67 EXPORT_SYMBOL(__debugger_ipi
);
68 EXPORT_SYMBOL(__debugger_bpt
);
69 EXPORT_SYMBOL(__debugger_sstep
);
70 EXPORT_SYMBOL(__debugger_iabr_match
);
71 EXPORT_SYMBOL(__debugger_dabr_match
);
72 EXPORT_SYMBOL(__debugger_fault_handler
);
76 * Trap & Exception support
79 #ifdef CONFIG_PMAC_BACKLIGHT
80 static void pmac_backlight_unblank(void)
82 mutex_lock(&pmac_backlight_mutex
);
84 struct backlight_properties
*props
;
86 props
= &pmac_backlight
->props
;
87 props
->brightness
= props
->max_brightness
;
88 props
->power
= FB_BLANK_UNBLANK
;
89 backlight_update_status(pmac_backlight
);
91 mutex_unlock(&pmac_backlight_mutex
);
94 static inline void pmac_backlight_unblank(void) { }
97 int die(const char *str
, struct pt_regs
*regs
, long err
)
102 int lock_owner_depth
;
104 .lock
= __SPIN_LOCK_UNLOCKED(die
.lock
),
106 .lock_owner_depth
= 0
108 static int die_counter
;
116 if (die
.lock_owner
!= raw_smp_processor_id()) {
118 spin_lock_irqsave(&die
.lock
, flags
);
119 die
.lock_owner
= smp_processor_id();
120 die
.lock_owner_depth
= 0;
122 if (machine_is(powermac
))
123 pmac_backlight_unblank();
125 local_save_flags(flags
);
128 if (++die
.lock_owner_depth
< 3) {
129 printk("Oops: %s, sig: %ld [#%d]\n", str
, err
, ++die_counter
);
130 #ifdef CONFIG_PREEMPT
134 printk("SMP NR_CPUS=%d ", NR_CPUS
);
136 #ifdef CONFIG_DEBUG_PAGEALLOC
137 printk("DEBUG_PAGEALLOC ");
142 printk("%s\n", ppc_md
.name
? ppc_md
.name
: "");
147 printk("Recursive die() failure, output suppressed\n");
152 spin_unlock_irqrestore(&die
.lock
, flags
);
154 if (kexec_should_crash(current
) ||
155 kexec_sr_activated(smp_processor_id()))
157 crash_kexec_secondary(regs
);
160 panic("Fatal exception in interrupt");
163 panic("Fatal exception");
171 void _exception(int signr
, struct pt_regs
*regs
, int code
, unsigned long addr
)
175 if (!user_mode(regs
)) {
176 if (die("Exception in kernel mode", regs
, signr
))
180 memset(&info
, 0, sizeof(info
));
181 info
.si_signo
= signr
;
183 info
.si_addr
= (void __user
*) addr
;
184 force_sig_info(signr
, &info
, current
);
187 * Init gets no signals that it doesn't have a handler for.
188 * That's all very well, but if it has caused a synchronous
189 * exception and we ignore the resulting signal, it will just
190 * generate the same exception over and over again and we get
191 * nowhere. Better to kill it and let the kernel panic.
193 if (is_init(current
)) {
194 __sighandler_t handler
;
196 spin_lock_irq(¤t
->sighand
->siglock
);
197 handler
= current
->sighand
->action
[signr
-1].sa
.sa_handler
;
198 spin_unlock_irq(¤t
->sighand
->siglock
);
199 if (handler
== SIG_DFL
) {
200 /* init has generated a synchronous exception
201 and it doesn't have a handler for the signal */
202 printk(KERN_CRIT
"init has generated signal %d "
203 "but has no handler for it\n", signr
);
210 void system_reset_exception(struct pt_regs
*regs
)
212 /* See if any machine dependent calls */
213 if (ppc_md
.system_reset_exception
) {
214 if (ppc_md
.system_reset_exception(regs
))
219 cpu_set(smp_processor_id(), cpus_in_sr
);
222 die("System Reset", regs
, SIGABRT
);
225 * Some CPUs when released from the debugger will execute this path.
226 * These CPUs entered the debugger via a soft-reset. If the CPU was
227 * hung before entering the debugger it will return to the hung
228 * state when exiting this function. This causes a problem in
229 * kdump since the hung CPU(s) will not respond to the IPI sent
230 * from kdump. To prevent the problem we call crash_kexec_secondary()
231 * here. If a kdump had not been initiated or we exit the debugger
232 * with the "exit and recover" command (x) crash_kexec_secondary()
233 * will return after 5ms and the CPU returns to its previous state.
235 crash_kexec_secondary(regs
);
237 /* Must die if the interrupt is not recoverable */
238 if (!(regs
->msr
& MSR_RI
))
239 panic("Unrecoverable System Reset");
241 /* What should we do here? We could issue a shutdown or hard reset. */
246 * I/O accesses can cause machine checks on powermacs.
247 * Check if the NIP corresponds to the address of a sync
248 * instruction for which there is an entry in the exception
250 * Note that the 601 only takes a machine check on TEA
251 * (transfer error ack) signal assertion, and does not
252 * set any of the top 16 bits of SRR1.
255 static inline int check_io_access(struct pt_regs
*regs
)
258 unsigned long msr
= regs
->msr
;
259 const struct exception_table_entry
*entry
;
260 unsigned int *nip
= (unsigned int *)regs
->nip
;
262 if (((msr
& 0xffff0000) == 0 || (msr
& (0x80000 | 0x40000)))
263 && (entry
= search_exception_tables(regs
->nip
)) != NULL
) {
265 * Check that it's a sync instruction, or somewhere
266 * in the twi; isync; nop sequence that inb/inw/inl uses.
267 * As the address is in the exception table
268 * we should be able to read the instr there.
269 * For the debug message, we look at the preceding
272 if (*nip
== 0x60000000) /* nop */
274 else if (*nip
== 0x4c00012c) /* isync */
276 if (*nip
== 0x7c0004ac || (*nip
>> 26) == 3) {
281 rb
= (*nip
>> 11) & 0x1f;
282 printk(KERN_DEBUG
"%s bad port %lx at %p\n",
283 (*nip
& 0x100)? "OUT to": "IN from",
284 regs
->gpr
[rb
] - _IO_BASE
, nip
);
286 regs
->nip
= entry
->fixup
;
290 #endif /* CONFIG_PPC32 */
294 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
295 /* On 4xx, the reason for the machine check or program exception
297 #define get_reason(regs) ((regs)->dsisr)
298 #ifndef CONFIG_FSL_BOOKE
299 #define get_mc_reason(regs) ((regs)->dsisr)
301 #define get_mc_reason(regs) (mfspr(SPRN_MCSR))
303 #define REASON_FP ESR_FP
304 #define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
305 #define REASON_PRIVILEGED ESR_PPR
306 #define REASON_TRAP ESR_PTR
308 /* single-step stuff */
309 #define single_stepping(regs) (current->thread.dbcr0 & DBCR0_IC)
310 #define clear_single_step(regs) (current->thread.dbcr0 &= ~DBCR0_IC)
313 /* On non-4xx, the reason for the machine check or program
314 exception is in the MSR. */
315 #define get_reason(regs) ((regs)->msr)
316 #define get_mc_reason(regs) ((regs)->msr)
317 #define REASON_FP 0x100000
318 #define REASON_ILLEGAL 0x80000
319 #define REASON_PRIVILEGED 0x40000
320 #define REASON_TRAP 0x20000
322 #define single_stepping(regs) ((regs)->msr & MSR_SE)
323 #define clear_single_step(regs) ((regs)->msr &= ~MSR_SE)
327 * This is "fall-back" implementation for configurations
328 * which don't provide platform-specific machine check info
330 void __attribute__ ((weak
))
331 platform_machine_check(struct pt_regs
*regs
)
335 void machine_check_exception(struct pt_regs
*regs
)
338 unsigned long reason
= get_mc_reason(regs
);
340 /* See if any machine dependent calls */
341 if (ppc_md
.machine_check_exception
)
342 recover
= ppc_md
.machine_check_exception(regs
);
347 if (user_mode(regs
)) {
349 _exception(SIGBUS
, regs
, BUS_ADRERR
, regs
->nip
);
353 #if defined(CONFIG_8xx) && defined(CONFIG_PCI)
354 /* the qspan pci read routines can cause machine checks -- Cort */
355 bad_page_fault(regs
, regs
->dar
, SIGBUS
);
359 if (debugger_fault_handler(regs
)) {
364 if (check_io_access(regs
))
367 #if defined(CONFIG_4xx) && !defined(CONFIG_440A)
368 if (reason
& ESR_IMCP
) {
369 printk("Instruction");
370 mtspr(SPRN_ESR
, reason
& ~ESR_IMCP
);
373 printk(" machine check in kernel mode.\n");
374 #elif defined(CONFIG_440A)
375 printk("Machine check in kernel mode.\n");
376 if (reason
& ESR_IMCP
){
377 printk("Instruction Synchronous Machine Check exception\n");
378 mtspr(SPRN_ESR
, reason
& ~ESR_IMCP
);
381 u32 mcsr
= mfspr(SPRN_MCSR
);
383 printk("Instruction Read PLB Error\n");
385 printk("Data Read PLB Error\n");
387 printk("Data Write PLB Error\n");
388 if (mcsr
& MCSR_TLBP
)
389 printk("TLB Parity Error\n");
390 if (mcsr
& MCSR_ICP
){
391 flush_instruction_cache();
392 printk("I-Cache Parity Error\n");
394 if (mcsr
& MCSR_DCSP
)
395 printk("D-Cache Search Parity Error\n");
396 if (mcsr
& MCSR_DCFP
)
397 printk("D-Cache Flush Parity Error\n");
398 if (mcsr
& MCSR_IMPE
)
399 printk("Machine Check exception is imprecise\n");
402 mtspr(SPRN_MCSR
, mcsr
);
404 #elif defined (CONFIG_E500)
405 printk("Machine check in kernel mode.\n");
406 printk("Caused by (from MCSR=%lx): ", reason
);
408 if (reason
& MCSR_MCP
)
409 printk("Machine Check Signal\n");
410 if (reason
& MCSR_ICPERR
)
411 printk("Instruction Cache Parity Error\n");
412 if (reason
& MCSR_DCP_PERR
)
413 printk("Data Cache Push Parity Error\n");
414 if (reason
& MCSR_DCPERR
)
415 printk("Data Cache Parity Error\n");
416 if (reason
& MCSR_GL_CI
)
417 printk("Guarded Load or Cache-Inhibited stwcx.\n");
418 if (reason
& MCSR_BUS_IAERR
)
419 printk("Bus - Instruction Address Error\n");
420 if (reason
& MCSR_BUS_RAERR
)
421 printk("Bus - Read Address Error\n");
422 if (reason
& MCSR_BUS_WAERR
)
423 printk("Bus - Write Address Error\n");
424 if (reason
& MCSR_BUS_IBERR
)
425 printk("Bus - Instruction Data Error\n");
426 if (reason
& MCSR_BUS_RBERR
)
427 printk("Bus - Read Data Bus Error\n");
428 if (reason
& MCSR_BUS_WBERR
)
429 printk("Bus - Read Data Bus Error\n");
430 if (reason
& MCSR_BUS_IPERR
)
431 printk("Bus - Instruction Parity Error\n");
432 if (reason
& MCSR_BUS_RPERR
)
433 printk("Bus - Read Parity Error\n");
434 #elif defined (CONFIG_E200)
435 printk("Machine check in kernel mode.\n");
436 printk("Caused by (from MCSR=%lx): ", reason
);
438 if (reason
& MCSR_MCP
)
439 printk("Machine Check Signal\n");
440 if (reason
& MCSR_CP_PERR
)
441 printk("Cache Push Parity Error\n");
442 if (reason
& MCSR_CPERR
)
443 printk("Cache Parity Error\n");
444 if (reason
& MCSR_EXCP_ERR
)
445 printk("ISI, ITLB, or Bus Error on first instruction fetch for an exception handler\n");
446 if (reason
& MCSR_BUS_IRERR
)
447 printk("Bus - Read Bus Error on instruction fetch\n");
448 if (reason
& MCSR_BUS_DRERR
)
449 printk("Bus - Read Bus Error on data load\n");
450 if (reason
& MCSR_BUS_WRERR
)
451 printk("Bus - Write Bus Error on buffered store or cache line push\n");
452 #else /* !CONFIG_4xx && !CONFIG_E500 && !CONFIG_E200 */
453 printk("Machine check in kernel mode.\n");
454 printk("Caused by (from SRR1=%lx): ", reason
);
455 switch (reason
& 0x601F0000) {
457 printk("Machine check signal\n");
459 case 0: /* for 601 */
461 case 0x140000: /* 7450 MSS error and TEA */
462 printk("Transfer error ack signal\n");
465 printk("Data parity error signal\n");
468 printk("Address parity error signal\n");
471 printk("L1 Data Cache error\n");
474 printk("L1 Instruction Cache error\n");
477 printk("L2 data cache parity error\n");
480 printk("Unknown values in msr\n");
482 #endif /* CONFIG_4xx */
485 * Optional platform-provided routine to print out
486 * additional info, e.g. bus error registers.
488 platform_machine_check(regs
);
490 if (debugger_fault_handler(regs
))
492 die("Machine check", regs
, SIGBUS
);
494 /* Must die if the interrupt is not recoverable */
495 if (!(regs
->msr
& MSR_RI
))
496 panic("Unrecoverable Machine check");
499 void SMIException(struct pt_regs
*regs
)
501 die("System Management Interrupt", regs
, SIGABRT
);
504 void unknown_exception(struct pt_regs
*regs
)
506 printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
507 regs
->nip
, regs
->msr
, regs
->trap
);
509 _exception(SIGTRAP
, regs
, 0, 0);
512 void instruction_breakpoint_exception(struct pt_regs
*regs
)
514 if (notify_die(DIE_IABR_MATCH
, "iabr_match", regs
, 5,
515 5, SIGTRAP
) == NOTIFY_STOP
)
517 if (debugger_iabr_match(regs
))
519 _exception(SIGTRAP
, regs
, TRAP_BRKPT
, regs
->nip
);
522 void RunModeException(struct pt_regs
*regs
)
524 _exception(SIGTRAP
, regs
, 0, 0);
527 void __kprobes
single_step_exception(struct pt_regs
*regs
)
529 regs
->msr
&= ~(MSR_SE
| MSR_BE
); /* Turn off 'trace' bits */
531 if (notify_die(DIE_SSTEP
, "single_step", regs
, 5,
532 5, SIGTRAP
) == NOTIFY_STOP
)
534 if (debugger_sstep(regs
))
537 _exception(SIGTRAP
, regs
, TRAP_TRACE
, regs
->nip
);
541 * After we have successfully emulated an instruction, we have to
542 * check if the instruction was being single-stepped, and if so,
543 * pretend we got a single-step exception. This was pointed out
544 * by Kumar Gala. -- paulus
546 static void emulate_single_step(struct pt_regs
*regs
)
548 if (single_stepping(regs
)) {
549 clear_single_step(regs
);
550 _exception(SIGTRAP
, regs
, TRAP_TRACE
, 0);
554 static inline int __parse_fpscr(unsigned long fpscr
)
558 /* Invalid operation */
559 if ((fpscr
& FPSCR_VE
) && (fpscr
& FPSCR_VX
))
563 else if ((fpscr
& FPSCR_OE
) && (fpscr
& FPSCR_OX
))
567 else if ((fpscr
& FPSCR_UE
) && (fpscr
& FPSCR_UX
))
571 else if ((fpscr
& FPSCR_ZE
) && (fpscr
& FPSCR_ZX
))
575 else if ((fpscr
& FPSCR_XE
) && (fpscr
& FPSCR_XX
))
581 static void parse_fpe(struct pt_regs
*regs
)
585 flush_fp_to_thread(current
);
587 code
= __parse_fpscr(current
->thread
.fpscr
.val
);
589 _exception(SIGFPE
, regs
, code
, regs
->nip
);
593 * Illegal instruction emulation support. Originally written to
594 * provide the PVR to user applications using the mfspr rd, PVR.
595 * Return non-zero if we can't emulate, or -EFAULT if the associated
596 * memory access caused an access fault. Return zero on success.
598 * There are a couple of ways to do this, either "decode" the instruction
599 * or directly match lots of bits. In this case, matching lots of
600 * bits is faster and easier.
603 #define INST_MFSPR_PVR 0x7c1f42a6
604 #define INST_MFSPR_PVR_MASK 0xfc1fffff
606 #define INST_DCBA 0x7c0005ec
607 #define INST_DCBA_MASK 0xfc0007fe
609 #define INST_MCRXR 0x7c000400
610 #define INST_MCRXR_MASK 0xfc0007fe
612 #define INST_STRING 0x7c00042a
613 #define INST_STRING_MASK 0xfc0007fe
614 #define INST_STRING_GEN_MASK 0xfc00067e
615 #define INST_LSWI 0x7c0004aa
616 #define INST_LSWX 0x7c00042a
617 #define INST_STSWI 0x7c0005aa
618 #define INST_STSWX 0x7c00052a
620 #define INST_POPCNTB 0x7c0000f4
621 #define INST_POPCNTB_MASK 0xfc0007fe
623 static int emulate_string_inst(struct pt_regs
*regs
, u32 instword
)
625 u8 rT
= (instword
>> 21) & 0x1f;
626 u8 rA
= (instword
>> 16) & 0x1f;
627 u8 NB_RB
= (instword
>> 11) & 0x1f;
632 /* Early out if we are an invalid form of lswx */
633 if ((instword
& INST_STRING_MASK
) == INST_LSWX
)
634 if ((rT
== rA
) || (rT
== NB_RB
))
637 EA
= (rA
== 0) ? 0 : regs
->gpr
[rA
];
639 switch (instword
& INST_STRING_MASK
) {
643 num_bytes
= regs
->xer
& 0x7f;
647 num_bytes
= (NB_RB
== 0) ? 32 : NB_RB
;
653 while (num_bytes
!= 0)
656 u32 shift
= 8 * (3 - (pos
& 0x3));
658 switch ((instword
& INST_STRING_MASK
)) {
661 if (get_user(val
, (u8 __user
*)EA
))
663 /* first time updating this reg,
667 regs
->gpr
[rT
] |= val
<< shift
;
671 val
= regs
->gpr
[rT
] >> shift
;
672 if (put_user(val
, (u8 __user
*)EA
))
676 /* move EA to next address */
680 /* manage our position within the register */
691 static int emulate_popcntb_inst(struct pt_regs
*regs
, u32 instword
)
696 ra
= (instword
>> 16) & 0x1f;
697 rs
= (instword
>> 21) & 0x1f;
700 tmp
= tmp
- ((tmp
>> 1) & 0x5555555555555555ULL
);
701 tmp
= (tmp
& 0x3333333333333333ULL
) + ((tmp
>> 2) & 0x3333333333333333ULL
);
702 tmp
= (tmp
+ (tmp
>> 4)) & 0x0f0f0f0f0f0f0f0fULL
;
708 static int emulate_instruction(struct pt_regs
*regs
)
713 if (!user_mode(regs
) || (regs
->msr
& MSR_LE
))
715 CHECK_FULL_REGS(regs
);
717 if (get_user(instword
, (u32 __user
*)(regs
->nip
)))
720 /* Emulate the mfspr rD, PVR. */
721 if ((instword
& INST_MFSPR_PVR_MASK
) == INST_MFSPR_PVR
) {
722 rd
= (instword
>> 21) & 0x1f;
723 regs
->gpr
[rd
] = mfspr(SPRN_PVR
);
727 /* Emulating the dcba insn is just a no-op. */
728 if ((instword
& INST_DCBA_MASK
) == INST_DCBA
)
731 /* Emulate the mcrxr insn. */
732 if ((instword
& INST_MCRXR_MASK
) == INST_MCRXR
) {
733 int shift
= (instword
>> 21) & 0x1c;
734 unsigned long msk
= 0xf0000000UL
>> shift
;
736 regs
->ccr
= (regs
->ccr
& ~msk
) | ((regs
->xer
>> shift
) & msk
);
737 regs
->xer
&= ~0xf0000000UL
;
741 /* Emulate load/store string insn. */
742 if ((instword
& INST_STRING_GEN_MASK
) == INST_STRING
)
743 return emulate_string_inst(regs
, instword
);
745 /* Emulate the popcntb (Population Count Bytes) instruction. */
746 if ((instword
& INST_POPCNTB_MASK
) == INST_POPCNTB
) {
747 return emulate_popcntb_inst(regs
, instword
);
753 int is_valid_bugaddr(unsigned long addr
)
755 return is_kernel_addr(addr
);
758 void __kprobes
program_check_exception(struct pt_regs
*regs
)
760 unsigned int reason
= get_reason(regs
);
761 extern int do_mathemu(struct pt_regs
*regs
);
763 /* We can now get here via a FP Unavailable exception if the core
764 * has no FPU, in that case the reason flags will be 0 */
766 if (reason
& REASON_FP
) {
767 /* IEEE FP exception */
771 if (reason
& REASON_TRAP
) {
773 if (notify_die(DIE_BPT
, "breakpoint", regs
, 5, 5, SIGTRAP
)
776 if (debugger_bpt(regs
))
779 if (!(regs
->msr
& MSR_PR
) && /* not user-mode */
780 report_bug(regs
->nip
) == BUG_TRAP_TYPE_WARN
) {
784 _exception(SIGTRAP
, regs
, TRAP_BRKPT
, regs
->nip
);
790 #ifdef CONFIG_MATH_EMULATION
791 /* (reason & REASON_ILLEGAL) would be the obvious thing here,
792 * but there seems to be a hardware bug on the 405GP (RevD)
793 * that means ESR is sometimes set incorrectly - either to
794 * ESR_DST (!?) or 0. In the process of chasing this with the
795 * hardware people - not sure if it can happen on any illegal
796 * instruction or only on FP instructions, whether there is a
797 * pattern to occurences etc. -dgibson 31/Mar/2003 */
798 switch (do_mathemu(regs
)) {
800 emulate_single_step(regs
);
804 code
= __parse_fpscr(current
->thread
.fpscr
.val
);
805 _exception(SIGFPE
, regs
, code
, regs
->nip
);
809 _exception(SIGSEGV
, regs
, SEGV_MAPERR
, regs
->nip
);
812 /* fall through on any other errors */
813 #endif /* CONFIG_MATH_EMULATION */
815 /* Try to emulate it if we should. */
816 if (reason
& (REASON_ILLEGAL
| REASON_PRIVILEGED
)) {
817 switch (emulate_instruction(regs
)) {
820 emulate_single_step(regs
);
823 _exception(SIGSEGV
, regs
, SEGV_MAPERR
, regs
->nip
);
828 if (reason
& REASON_PRIVILEGED
)
829 _exception(SIGILL
, regs
, ILL_PRVOPC
, regs
->nip
);
831 _exception(SIGILL
, regs
, ILL_ILLOPC
, regs
->nip
);
834 void alignment_exception(struct pt_regs
*regs
)
836 int sig
, code
, fixed
= 0;
838 /* we don't implement logging of alignment exceptions */
839 if (!(current
->thread
.align_ctl
& PR_UNALIGN_SIGBUS
))
840 fixed
= fix_alignment(regs
);
843 regs
->nip
+= 4; /* skip over emulated instruction */
844 emulate_single_step(regs
);
848 /* Operand address was bad */
849 if (fixed
== -EFAULT
) {
857 _exception(sig
, regs
, code
, regs
->dar
);
859 bad_page_fault(regs
, regs
->dar
, sig
);
862 void StackOverflow(struct pt_regs
*regs
)
864 printk(KERN_CRIT
"Kernel stack overflow in process %p, r1=%lx\n",
865 current
, regs
->gpr
[1]);
868 panic("kernel stack overflow");
871 void nonrecoverable_exception(struct pt_regs
*regs
)
873 printk(KERN_ERR
"Non-recoverable exception at PC=%lx MSR=%lx\n",
874 regs
->nip
, regs
->msr
);
876 die("nonrecoverable exception", regs
, SIGKILL
);
879 void trace_syscall(struct pt_regs
*regs
)
881 printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n",
882 current
, current
->pid
, regs
->nip
, regs
->link
, regs
->gpr
[0],
883 regs
->ccr
&0x10000000?"Error=":"", regs
->gpr
[3], print_tainted());
886 void kernel_fp_unavailable_exception(struct pt_regs
*regs
)
888 printk(KERN_EMERG
"Unrecoverable FP Unavailable Exception "
889 "%lx at %lx\n", regs
->trap
, regs
->nip
);
890 die("Unrecoverable FP Unavailable Exception", regs
, SIGABRT
);
893 void altivec_unavailable_exception(struct pt_regs
*regs
)
895 if (user_mode(regs
)) {
896 /* A user program has executed an altivec instruction,
897 but this kernel doesn't support altivec. */
898 _exception(SIGILL
, regs
, ILL_ILLOPC
, regs
->nip
);
902 printk(KERN_EMERG
"Unrecoverable VMX/Altivec Unavailable Exception "
903 "%lx at %lx\n", regs
->trap
, regs
->nip
);
904 die("Unrecoverable VMX/Altivec Unavailable Exception", regs
, SIGABRT
);
907 void performance_monitor_exception(struct pt_regs
*regs
)
913 void SoftwareEmulation(struct pt_regs
*regs
)
915 extern int do_mathemu(struct pt_regs
*);
916 extern int Soft_emulate_8xx(struct pt_regs
*);
919 CHECK_FULL_REGS(regs
);
921 if (!user_mode(regs
)) {
923 die("Kernel Mode Software FPU Emulation", regs
, SIGFPE
);
926 #ifdef CONFIG_MATH_EMULATION
927 errcode
= do_mathemu(regs
);
931 emulate_single_step(regs
);
935 code
= __parse_fpscr(current
->thread
.fpscr
.val
);
936 _exception(SIGFPE
, regs
, code
, regs
->nip
);
940 _exception(SIGSEGV
, regs
, SEGV_MAPERR
, regs
->nip
);
943 _exception(SIGILL
, regs
, ILL_ILLOPC
, regs
->nip
);
948 errcode
= Soft_emulate_8xx(regs
);
951 emulate_single_step(regs
);
954 _exception(SIGILL
, regs
, ILL_ILLOPC
, regs
->nip
);
957 _exception(SIGSEGV
, regs
, SEGV_MAPERR
, regs
->nip
);
962 #endif /* CONFIG_8xx */
964 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
966 void DebugException(struct pt_regs
*regs
, unsigned long debug_status
)
968 if (debug_status
& DBSR_IC
) { /* instruction completion */
969 regs
->msr
&= ~MSR_DE
;
970 if (user_mode(regs
)) {
971 current
->thread
.dbcr0
&= ~DBCR0_IC
;
973 /* Disable instruction completion */
974 mtspr(SPRN_DBCR0
, mfspr(SPRN_DBCR0
) & ~DBCR0_IC
);
975 /* Clear the instruction completion event */
976 mtspr(SPRN_DBSR
, DBSR_IC
);
977 if (debugger_sstep(regs
))
980 _exception(SIGTRAP
, regs
, TRAP_TRACE
, 0);
983 #endif /* CONFIG_4xx || CONFIG_BOOKE */
985 #if !defined(CONFIG_TAU_INT)
986 void TAUException(struct pt_regs
*regs
)
988 printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
989 regs
->nip
, regs
->msr
, regs
->trap
, print_tainted());
991 #endif /* CONFIG_INT_TAU */
993 #ifdef CONFIG_ALTIVEC
994 void altivec_assist_exception(struct pt_regs
*regs
)
998 if (!user_mode(regs
)) {
999 printk(KERN_EMERG
"VMX/Altivec assist exception in kernel mode"
1000 " at %lx\n", regs
->nip
);
1001 die("Kernel VMX/Altivec assist exception", regs
, SIGILL
);
1004 flush_altivec_to_thread(current
);
1006 err
= emulate_altivec(regs
);
1008 regs
->nip
+= 4; /* skip emulated instruction */
1009 emulate_single_step(regs
);
1013 if (err
== -EFAULT
) {
1014 /* got an error reading the instruction */
1015 _exception(SIGSEGV
, regs
, SEGV_ACCERR
, regs
->nip
);
1017 /* didn't recognize the instruction */
1018 /* XXX quick hack for now: set the non-Java bit in the VSCR */
1019 if (printk_ratelimit())
1020 printk(KERN_ERR
"Unrecognized altivec instruction "
1021 "in %s at %lx\n", current
->comm
, regs
->nip
);
1022 current
->thread
.vscr
.u
[3] |= 0x10000;
1025 #endif /* CONFIG_ALTIVEC */
1027 #ifdef CONFIG_FSL_BOOKE
1028 void CacheLockingException(struct pt_regs
*regs
, unsigned long address
,
1029 unsigned long error_code
)
1031 /* We treat cache locking instructions from the user
1032 * as priv ops, in the future we could try to do
1035 if (error_code
& (ESR_DLK
|ESR_ILK
))
1036 _exception(SIGILL
, regs
, ILL_PRVOPC
, regs
->nip
);
1039 #endif /* CONFIG_FSL_BOOKE */
1042 void SPEFloatingPointException(struct pt_regs
*regs
)
1044 unsigned long spefscr
;
1048 spefscr
= current
->thread
.spefscr
;
1049 fpexc_mode
= current
->thread
.fpexc_mode
;
1051 /* Hardware does not neccessarily set sticky
1052 * underflow/overflow/invalid flags */
1053 if ((spefscr
& SPEFSCR_FOVF
) && (fpexc_mode
& PR_FP_EXC_OVF
)) {
1055 spefscr
|= SPEFSCR_FOVFS
;
1057 else if ((spefscr
& SPEFSCR_FUNF
) && (fpexc_mode
& PR_FP_EXC_UND
)) {
1059 spefscr
|= SPEFSCR_FUNFS
;
1061 else if ((spefscr
& SPEFSCR_FDBZ
) && (fpexc_mode
& PR_FP_EXC_DIV
))
1063 else if ((spefscr
& SPEFSCR_FINV
) && (fpexc_mode
& PR_FP_EXC_INV
)) {
1065 spefscr
|= SPEFSCR_FINVS
;
1067 else if ((spefscr
& (SPEFSCR_FG
| SPEFSCR_FX
)) && (fpexc_mode
& PR_FP_EXC_RES
))
1070 current
->thread
.spefscr
= spefscr
;
1072 _exception(SIGFPE
, regs
, code
, regs
->nip
);
1078 * We enter here if we get an unrecoverable exception, that is, one
1079 * that happened at a point where the RI (recoverable interrupt) bit
1080 * in the MSR is 0. This indicates that SRR0/1 are live, and that
1081 * we therefore lost state by taking this exception.
1083 void unrecoverable_exception(struct pt_regs
*regs
)
1085 printk(KERN_EMERG
"Unrecoverable exception %lx at %lx\n",
1086 regs
->trap
, regs
->nip
);
1087 die("Unrecoverable exception", regs
, SIGABRT
);
1090 #ifdef CONFIG_BOOKE_WDT
1092 * Default handler for a Watchdog exception,
1093 * spins until a reboot occurs
1095 void __attribute__ ((weak
)) WatchdogHandler(struct pt_regs
*regs
)
1097 /* Generic WatchdogHandler, implement your own */
1098 mtspr(SPRN_TCR
, mfspr(SPRN_TCR
)&(~TCR_WIE
));
1102 void WatchdogException(struct pt_regs
*regs
)
1104 printk (KERN_EMERG
"PowerPC Book-E Watchdog Exception\n");
1105 WatchdogHandler(regs
);
1110 * We enter here if we discover during exception entry that we are
1111 * running in supervisor mode with a userspace value in the stack pointer.
1113 void kernel_bad_stack(struct pt_regs
*regs
)
1115 printk(KERN_EMERG
"Bad kernel stack pointer %lx at %lx\n",
1116 regs
->gpr
[1], regs
->nip
);
1117 die("Bad kernel stack pointer", regs
, SIGABRT
);
1120 void __init
trap_init(void)