Commit | Line | Data |
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14cf11af | 1 | /* |
14cf11af | 2 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
fe04b112 | 3 | * Copyright 2007-2010 Freescale Semiconductor, Inc. |
14cf11af PM |
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 | ||
14cf11af PM |
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> | |
8dad3f92 | 24 | #include <linux/ptrace.h> |
14cf11af | 25 | #include <linux/user.h> |
14cf11af | 26 | #include <linux/interrupt.h> |
14cf11af PM |
27 | #include <linux/init.h> |
28 | #include <linux/module.h> | |
8dad3f92 | 29 | #include <linux/prctl.h> |
14cf11af PM |
30 | #include <linux/delay.h> |
31 | #include <linux/kprobes.h> | |
cc532915 | 32 | #include <linux/kexec.h> |
5474c120 | 33 | #include <linux/backlight.h> |
73c9ceab | 34 | #include <linux/bug.h> |
1eeb66a1 | 35 | #include <linux/kdebug.h> |
80947e7c | 36 | #include <linux/debugfs.h> |
76462232 | 37 | #include <linux/ratelimit.h> |
14cf11af | 38 | |
80947e7c | 39 | #include <asm/emulated_ops.h> |
14cf11af PM |
40 | #include <asm/pgtable.h> |
41 | #include <asm/uaccess.h> | |
42 | #include <asm/system.h> | |
43 | #include <asm/io.h> | |
86417780 PM |
44 | #include <asm/machdep.h> |
45 | #include <asm/rtas.h> | |
f7f6f4fe | 46 | #include <asm/pmc.h> |
dc1c1ca3 | 47 | #ifdef CONFIG_PPC32 |
14cf11af | 48 | #include <asm/reg.h> |
86417780 | 49 | #endif |
14cf11af PM |
50 | #ifdef CONFIG_PMAC_BACKLIGHT |
51 | #include <asm/backlight.h> | |
52 | #endif | |
dc1c1ca3 | 53 | #ifdef CONFIG_PPC64 |
86417780 | 54 | #include <asm/firmware.h> |
dc1c1ca3 | 55 | #include <asm/processor.h> |
dc1c1ca3 | 56 | #endif |
c0ce7d08 | 57 | #include <asm/kexec.h> |
16c57b36 | 58 | #include <asm/ppc-opcode.h> |
cce1f106 | 59 | #include <asm/rio.h> |
dc1c1ca3 | 60 | |
7dbb922c | 61 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
5be3492f AB |
62 | int (*__debugger)(struct pt_regs *regs) __read_mostly; |
63 | int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly; | |
64 | int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly; | |
65 | int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly; | |
66 | int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly; | |
67 | int (*__debugger_dabr_match)(struct pt_regs *regs) __read_mostly; | |
68 | int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly; | |
14cf11af PM |
69 | |
70 | EXPORT_SYMBOL(__debugger); | |
71 | EXPORT_SYMBOL(__debugger_ipi); | |
72 | EXPORT_SYMBOL(__debugger_bpt); | |
73 | EXPORT_SYMBOL(__debugger_sstep); | |
74 | EXPORT_SYMBOL(__debugger_iabr_match); | |
75 | EXPORT_SYMBOL(__debugger_dabr_match); | |
76 | EXPORT_SYMBOL(__debugger_fault_handler); | |
77 | #endif | |
78 | ||
14cf11af PM |
79 | /* |
80 | * Trap & Exception support | |
81 | */ | |
82 | ||
6031d9d9 | 83 | #ifdef CONFIG_PMAC_BACKLIGHT |
84 | static void pmac_backlight_unblank(void) | |
85 | { | |
86 | mutex_lock(&pmac_backlight_mutex); | |
87 | if (pmac_backlight) { | |
88 | struct backlight_properties *props; | |
89 | ||
90 | props = &pmac_backlight->props; | |
91 | props->brightness = props->max_brightness; | |
92 | props->power = FB_BLANK_UNBLANK; | |
93 | backlight_update_status(pmac_backlight); | |
94 | } | |
95 | mutex_unlock(&pmac_backlight_mutex); | |
96 | } | |
97 | #else | |
98 | static inline void pmac_backlight_unblank(void) { } | |
99 | #endif | |
100 | ||
14cf11af PM |
101 | int die(const char *str, struct pt_regs *regs, long err) |
102 | { | |
34c2a14f | 103 | static struct { |
b8f87782 | 104 | raw_spinlock_t lock; |
34c2a14f | 105 | u32 lock_owner; |
106 | int lock_owner_depth; | |
107 | } die = { | |
b8f87782 | 108 | .lock = __RAW_SPIN_LOCK_UNLOCKED(die.lock), |
34c2a14f | 109 | .lock_owner = -1, |
110 | .lock_owner_depth = 0 | |
111 | }; | |
c0ce7d08 | 112 | static int die_counter; |
34c2a14f | 113 | unsigned long flags; |
14cf11af PM |
114 | |
115 | if (debugger(regs)) | |
116 | return 1; | |
117 | ||
293e4688 | 118 | oops_enter(); |
119 | ||
34c2a14f | 120 | if (die.lock_owner != raw_smp_processor_id()) { |
121 | console_verbose(); | |
b8f87782 | 122 | raw_spin_lock_irqsave(&die.lock, flags); |
34c2a14f | 123 | die.lock_owner = smp_processor_id(); |
124 | die.lock_owner_depth = 0; | |
125 | bust_spinlocks(1); | |
126 | if (machine_is(powermac)) | |
127 | pmac_backlight_unblank(); | |
128 | } else { | |
129 | local_save_flags(flags); | |
130 | } | |
5474c120 | 131 | |
34c2a14f | 132 | if (++die.lock_owner_depth < 3) { |
133 | printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter); | |
14cf11af | 134 | #ifdef CONFIG_PREEMPT |
34c2a14f | 135 | printk("PREEMPT "); |
14cf11af PM |
136 | #endif |
137 | #ifdef CONFIG_SMP | |
34c2a14f | 138 | printk("SMP NR_CPUS=%d ", NR_CPUS); |
14cf11af PM |
139 | #endif |
140 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
34c2a14f | 141 | printk("DEBUG_PAGEALLOC "); |
14cf11af PM |
142 | #endif |
143 | #ifdef CONFIG_NUMA | |
34c2a14f | 144 | printk("NUMA "); |
14cf11af | 145 | #endif |
ae7f4463 | 146 | printk("%s\n", ppc_md.name ? ppc_md.name : ""); |
34c2a14f | 147 | |
66fcb105 AB |
148 | if (notify_die(DIE_OOPS, str, regs, err, 255, |
149 | SIGSEGV) == NOTIFY_STOP) | |
150 | return 1; | |
151 | ||
34c2a14f | 152 | print_modules(); |
153 | show_regs(regs); | |
154 | } else { | |
155 | printk("Recursive die() failure, output suppressed\n"); | |
156 | } | |
e8222502 | 157 | |
14cf11af | 158 | bust_spinlocks(0); |
34c2a14f | 159 | die.lock_owner = -1; |
bcdcd8e7 | 160 | add_taint(TAINT_DIE); |
b8f87782 | 161 | raw_spin_unlock_irqrestore(&die.lock, flags); |
cc532915 | 162 | |
c0ce7d08 DW |
163 | if (kexec_should_crash(current) || |
164 | kexec_sr_activated(smp_processor_id())) | |
cc532915 | 165 | crash_kexec(regs); |
c0ce7d08 | 166 | crash_kexec_secondary(regs); |
14cf11af PM |
167 | |
168 | if (in_interrupt()) | |
169 | panic("Fatal exception in interrupt"); | |
170 | ||
cea6a4ba | 171 | if (panic_on_oops) |
012c437d | 172 | panic("Fatal exception"); |
cea6a4ba | 173 | |
293e4688 | 174 | oops_exit(); |
14cf11af PM |
175 | do_exit(err); |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
25baa35b ON |
180 | void user_single_step_siginfo(struct task_struct *tsk, |
181 | struct pt_regs *regs, siginfo_t *info) | |
182 | { | |
183 | memset(info, 0, sizeof(*info)); | |
184 | info->si_signo = SIGTRAP; | |
185 | info->si_code = TRAP_TRACE; | |
186 | info->si_addr = (void __user *)regs->nip; | |
187 | } | |
188 | ||
14cf11af PM |
189 | void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) |
190 | { | |
191 | siginfo_t info; | |
d0c3d534 OJ |
192 | const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \ |
193 | "at %08lx nip %08lx lr %08lx code %x\n"; | |
194 | const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \ | |
195 | "at %016lx nip %016lx lr %016lx code %x\n"; | |
14cf11af PM |
196 | |
197 | if (!user_mode(regs)) { | |
198 | if (die("Exception in kernel mode", regs, signr)) | |
199 | return; | |
d0c3d534 | 200 | } else if (show_unhandled_signals && |
76462232 CD |
201 | unhandled_signal(current, signr)) { |
202 | printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32, | |
203 | current->comm, current->pid, signr, | |
204 | addr, regs->nip, regs->link, code); | |
205 | } | |
14cf11af PM |
206 | |
207 | memset(&info, 0, sizeof(info)); | |
208 | info.si_signo = signr; | |
209 | info.si_code = code; | |
210 | info.si_addr = (void __user *) addr; | |
211 | force_sig_info(signr, &info, current); | |
14cf11af PM |
212 | } |
213 | ||
214 | #ifdef CONFIG_PPC64 | |
215 | void system_reset_exception(struct pt_regs *regs) | |
216 | { | |
217 | /* See if any machine dependent calls */ | |
c902be71 AB |
218 | if (ppc_md.system_reset_exception) { |
219 | if (ppc_md.system_reset_exception(regs)) | |
220 | return; | |
221 | } | |
14cf11af | 222 | |
c0ce7d08 | 223 | #ifdef CONFIG_KEXEC |
104699c0 | 224 | cpumask_set_cpu(smp_processor_id(), &cpus_in_sr); |
c0ce7d08 DW |
225 | #endif |
226 | ||
8dad3f92 | 227 | die("System Reset", regs, SIGABRT); |
14cf11af | 228 | |
eac8392f DW |
229 | /* |
230 | * Some CPUs when released from the debugger will execute this path. | |
231 | * These CPUs entered the debugger via a soft-reset. If the CPU was | |
232 | * hung before entering the debugger it will return to the hung | |
233 | * state when exiting this function. This causes a problem in | |
234 | * kdump since the hung CPU(s) will not respond to the IPI sent | |
235 | * from kdump. To prevent the problem we call crash_kexec_secondary() | |
236 | * here. If a kdump had not been initiated or we exit the debugger | |
237 | * with the "exit and recover" command (x) crash_kexec_secondary() | |
238 | * will return after 5ms and the CPU returns to its previous state. | |
239 | */ | |
240 | crash_kexec_secondary(regs); | |
241 | ||
14cf11af PM |
242 | /* Must die if the interrupt is not recoverable */ |
243 | if (!(regs->msr & MSR_RI)) | |
244 | panic("Unrecoverable System Reset"); | |
245 | ||
246 | /* What should we do here? We could issue a shutdown or hard reset. */ | |
247 | } | |
248 | #endif | |
249 | ||
250 | /* | |
251 | * I/O accesses can cause machine checks on powermacs. | |
252 | * Check if the NIP corresponds to the address of a sync | |
253 | * instruction for which there is an entry in the exception | |
254 | * table. | |
255 | * Note that the 601 only takes a machine check on TEA | |
256 | * (transfer error ack) signal assertion, and does not | |
257 | * set any of the top 16 bits of SRR1. | |
258 | * -- paulus. | |
259 | */ | |
260 | static inline int check_io_access(struct pt_regs *regs) | |
261 | { | |
68a64357 | 262 | #ifdef CONFIG_PPC32 |
14cf11af PM |
263 | unsigned long msr = regs->msr; |
264 | const struct exception_table_entry *entry; | |
265 | unsigned int *nip = (unsigned int *)regs->nip; | |
266 | ||
267 | if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000))) | |
268 | && (entry = search_exception_tables(regs->nip)) != NULL) { | |
269 | /* | |
270 | * Check that it's a sync instruction, or somewhere | |
271 | * in the twi; isync; nop sequence that inb/inw/inl uses. | |
272 | * As the address is in the exception table | |
273 | * we should be able to read the instr there. | |
274 | * For the debug message, we look at the preceding | |
275 | * load or store. | |
276 | */ | |
277 | if (*nip == 0x60000000) /* nop */ | |
278 | nip -= 2; | |
279 | else if (*nip == 0x4c00012c) /* isync */ | |
280 | --nip; | |
281 | if (*nip == 0x7c0004ac || (*nip >> 26) == 3) { | |
282 | /* sync or twi */ | |
283 | unsigned int rb; | |
284 | ||
285 | --nip; | |
286 | rb = (*nip >> 11) & 0x1f; | |
287 | printk(KERN_DEBUG "%s bad port %lx at %p\n", | |
288 | (*nip & 0x100)? "OUT to": "IN from", | |
289 | regs->gpr[rb] - _IO_BASE, nip); | |
290 | regs->msr |= MSR_RI; | |
291 | regs->nip = entry->fixup; | |
292 | return 1; | |
293 | } | |
294 | } | |
68a64357 | 295 | #endif /* CONFIG_PPC32 */ |
14cf11af PM |
296 | return 0; |
297 | } | |
298 | ||
172ae2e7 | 299 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
14cf11af PM |
300 | /* On 4xx, the reason for the machine check or program exception |
301 | is in the ESR. */ | |
302 | #define get_reason(regs) ((regs)->dsisr) | |
303 | #ifndef CONFIG_FSL_BOOKE | |
304 | #define get_mc_reason(regs) ((regs)->dsisr) | |
305 | #else | |
fe04b112 | 306 | #define get_mc_reason(regs) (mfspr(SPRN_MCSR)) |
14cf11af PM |
307 | #endif |
308 | #define REASON_FP ESR_FP | |
309 | #define REASON_ILLEGAL (ESR_PIL | ESR_PUO) | |
310 | #define REASON_PRIVILEGED ESR_PPR | |
311 | #define REASON_TRAP ESR_PTR | |
312 | ||
313 | /* single-step stuff */ | |
314 | #define single_stepping(regs) (current->thread.dbcr0 & DBCR0_IC) | |
315 | #define clear_single_step(regs) (current->thread.dbcr0 &= ~DBCR0_IC) | |
316 | ||
317 | #else | |
318 | /* On non-4xx, the reason for the machine check or program | |
319 | exception is in the MSR. */ | |
320 | #define get_reason(regs) ((regs)->msr) | |
321 | #define get_mc_reason(regs) ((regs)->msr) | |
322 | #define REASON_FP 0x100000 | |
323 | #define REASON_ILLEGAL 0x80000 | |
324 | #define REASON_PRIVILEGED 0x40000 | |
325 | #define REASON_TRAP 0x20000 | |
326 | ||
327 | #define single_stepping(regs) ((regs)->msr & MSR_SE) | |
328 | #define clear_single_step(regs) ((regs)->msr &= ~MSR_SE) | |
329 | #endif | |
330 | ||
47c0bd1a BH |
331 | #if defined(CONFIG_4xx) |
332 | int machine_check_4xx(struct pt_regs *regs) | |
14cf11af | 333 | { |
1a6a4ffe | 334 | unsigned long reason = get_mc_reason(regs); |
14cf11af | 335 | |
14cf11af PM |
336 | if (reason & ESR_IMCP) { |
337 | printk("Instruction"); | |
338 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
339 | } else | |
340 | printk("Data"); | |
341 | printk(" machine check in kernel mode.\n"); | |
47c0bd1a BH |
342 | |
343 | return 0; | |
344 | } | |
345 | ||
346 | int machine_check_440A(struct pt_regs *regs) | |
347 | { | |
348 | unsigned long reason = get_mc_reason(regs); | |
349 | ||
14cf11af PM |
350 | printk("Machine check in kernel mode.\n"); |
351 | if (reason & ESR_IMCP){ | |
352 | printk("Instruction Synchronous Machine Check exception\n"); | |
353 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
354 | } | |
355 | else { | |
356 | u32 mcsr = mfspr(SPRN_MCSR); | |
357 | if (mcsr & MCSR_IB) | |
358 | printk("Instruction Read PLB Error\n"); | |
359 | if (mcsr & MCSR_DRB) | |
360 | printk("Data Read PLB Error\n"); | |
361 | if (mcsr & MCSR_DWB) | |
362 | printk("Data Write PLB Error\n"); | |
363 | if (mcsr & MCSR_TLBP) | |
364 | printk("TLB Parity Error\n"); | |
365 | if (mcsr & MCSR_ICP){ | |
366 | flush_instruction_cache(); | |
367 | printk("I-Cache Parity Error\n"); | |
368 | } | |
369 | if (mcsr & MCSR_DCSP) | |
370 | printk("D-Cache Search Parity Error\n"); | |
371 | if (mcsr & MCSR_DCFP) | |
372 | printk("D-Cache Flush Parity Error\n"); | |
373 | if (mcsr & MCSR_IMPE) | |
374 | printk("Machine Check exception is imprecise\n"); | |
375 | ||
376 | /* Clear MCSR */ | |
377 | mtspr(SPRN_MCSR, mcsr); | |
378 | } | |
47c0bd1a BH |
379 | return 0; |
380 | } | |
fc5e7097 DK |
381 | |
382 | int machine_check_47x(struct pt_regs *regs) | |
383 | { | |
384 | unsigned long reason = get_mc_reason(regs); | |
385 | u32 mcsr; | |
386 | ||
387 | printk(KERN_ERR "Machine check in kernel mode.\n"); | |
388 | if (reason & ESR_IMCP) { | |
389 | printk(KERN_ERR | |
390 | "Instruction Synchronous Machine Check exception\n"); | |
391 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
392 | return 0; | |
393 | } | |
394 | mcsr = mfspr(SPRN_MCSR); | |
395 | if (mcsr & MCSR_IB) | |
396 | printk(KERN_ERR "Instruction Read PLB Error\n"); | |
397 | if (mcsr & MCSR_DRB) | |
398 | printk(KERN_ERR "Data Read PLB Error\n"); | |
399 | if (mcsr & MCSR_DWB) | |
400 | printk(KERN_ERR "Data Write PLB Error\n"); | |
401 | if (mcsr & MCSR_TLBP) | |
402 | printk(KERN_ERR "TLB Parity Error\n"); | |
403 | if (mcsr & MCSR_ICP) { | |
404 | flush_instruction_cache(); | |
405 | printk(KERN_ERR "I-Cache Parity Error\n"); | |
406 | } | |
407 | if (mcsr & MCSR_DCSP) | |
408 | printk(KERN_ERR "D-Cache Search Parity Error\n"); | |
409 | if (mcsr & PPC47x_MCSR_GPR) | |
410 | printk(KERN_ERR "GPR Parity Error\n"); | |
411 | if (mcsr & PPC47x_MCSR_FPR) | |
412 | printk(KERN_ERR "FPR Parity Error\n"); | |
413 | if (mcsr & PPC47x_MCSR_IPR) | |
414 | printk(KERN_ERR "Machine Check exception is imprecise\n"); | |
415 | ||
416 | /* Clear MCSR */ | |
417 | mtspr(SPRN_MCSR, mcsr); | |
418 | ||
419 | return 0; | |
420 | } | |
47c0bd1a | 421 | #elif defined(CONFIG_E500) |
fe04b112 SW |
422 | int machine_check_e500mc(struct pt_regs *regs) |
423 | { | |
424 | unsigned long mcsr = mfspr(SPRN_MCSR); | |
425 | unsigned long reason = mcsr; | |
426 | int recoverable = 1; | |
427 | ||
82a9a480 | 428 | if (reason & MCSR_LD) { |
cce1f106 SX |
429 | recoverable = fsl_rio_mcheck_exception(regs); |
430 | if (recoverable == 1) | |
431 | goto silent_out; | |
432 | } | |
433 | ||
fe04b112 SW |
434 | printk("Machine check in kernel mode.\n"); |
435 | printk("Caused by (from MCSR=%lx): ", reason); | |
436 | ||
437 | if (reason & MCSR_MCP) | |
438 | printk("Machine Check Signal\n"); | |
439 | ||
440 | if (reason & MCSR_ICPERR) { | |
441 | printk("Instruction Cache Parity Error\n"); | |
442 | ||
443 | /* | |
444 | * This is recoverable by invalidating the i-cache. | |
445 | */ | |
446 | mtspr(SPRN_L1CSR1, mfspr(SPRN_L1CSR1) | L1CSR1_ICFI); | |
447 | while (mfspr(SPRN_L1CSR1) & L1CSR1_ICFI) | |
448 | ; | |
449 | ||
450 | /* | |
451 | * This will generally be accompanied by an instruction | |
452 | * fetch error report -- only treat MCSR_IF as fatal | |
453 | * if it wasn't due to an L1 parity error. | |
454 | */ | |
455 | reason &= ~MCSR_IF; | |
456 | } | |
457 | ||
458 | if (reason & MCSR_DCPERR_MC) { | |
459 | printk("Data Cache Parity Error\n"); | |
460 | recoverable = 0; | |
461 | } | |
462 | ||
463 | if (reason & MCSR_L2MMU_MHIT) { | |
464 | printk("Hit on multiple TLB entries\n"); | |
465 | recoverable = 0; | |
466 | } | |
467 | ||
468 | if (reason & MCSR_NMI) | |
469 | printk("Non-maskable interrupt\n"); | |
470 | ||
471 | if (reason & MCSR_IF) { | |
472 | printk("Instruction Fetch Error Report\n"); | |
473 | recoverable = 0; | |
474 | } | |
475 | ||
476 | if (reason & MCSR_LD) { | |
477 | printk("Load Error Report\n"); | |
478 | recoverable = 0; | |
479 | } | |
480 | ||
481 | if (reason & MCSR_ST) { | |
482 | printk("Store Error Report\n"); | |
483 | recoverable = 0; | |
484 | } | |
485 | ||
486 | if (reason & MCSR_LDG) { | |
487 | printk("Guarded Load Error Report\n"); | |
488 | recoverable = 0; | |
489 | } | |
490 | ||
491 | if (reason & MCSR_TLBSYNC) | |
492 | printk("Simultaneous tlbsync operations\n"); | |
493 | ||
494 | if (reason & MCSR_BSL2_ERR) { | |
495 | printk("Level 2 Cache Error\n"); | |
496 | recoverable = 0; | |
497 | } | |
498 | ||
499 | if (reason & MCSR_MAV) { | |
500 | u64 addr; | |
501 | ||
502 | addr = mfspr(SPRN_MCAR); | |
503 | addr |= (u64)mfspr(SPRN_MCARU) << 32; | |
504 | ||
505 | printk("Machine Check %s Address: %#llx\n", | |
506 | reason & MCSR_MEA ? "Effective" : "Physical", addr); | |
507 | } | |
508 | ||
cce1f106 | 509 | silent_out: |
fe04b112 SW |
510 | mtspr(SPRN_MCSR, mcsr); |
511 | return mfspr(SPRN_MCSR) == 0 && recoverable; | |
512 | } | |
513 | ||
47c0bd1a BH |
514 | int machine_check_e500(struct pt_regs *regs) |
515 | { | |
516 | unsigned long reason = get_mc_reason(regs); | |
517 | ||
cce1f106 SX |
518 | if (reason & MCSR_BUS_RBERR) { |
519 | if (fsl_rio_mcheck_exception(regs)) | |
520 | return 1; | |
521 | } | |
522 | ||
14cf11af PM |
523 | printk("Machine check in kernel mode.\n"); |
524 | printk("Caused by (from MCSR=%lx): ", reason); | |
525 | ||
526 | if (reason & MCSR_MCP) | |
527 | printk("Machine Check Signal\n"); | |
528 | if (reason & MCSR_ICPERR) | |
529 | printk("Instruction Cache Parity Error\n"); | |
530 | if (reason & MCSR_DCP_PERR) | |
531 | printk("Data Cache Push Parity Error\n"); | |
532 | if (reason & MCSR_DCPERR) | |
533 | printk("Data Cache Parity Error\n"); | |
14cf11af PM |
534 | if (reason & MCSR_BUS_IAERR) |
535 | printk("Bus - Instruction Address Error\n"); | |
536 | if (reason & MCSR_BUS_RAERR) | |
537 | printk("Bus - Read Address Error\n"); | |
538 | if (reason & MCSR_BUS_WAERR) | |
539 | printk("Bus - Write Address Error\n"); | |
540 | if (reason & MCSR_BUS_IBERR) | |
541 | printk("Bus - Instruction Data Error\n"); | |
542 | if (reason & MCSR_BUS_RBERR) | |
543 | printk("Bus - Read Data Bus Error\n"); | |
544 | if (reason & MCSR_BUS_WBERR) | |
545 | printk("Bus - Read Data Bus Error\n"); | |
546 | if (reason & MCSR_BUS_IPERR) | |
547 | printk("Bus - Instruction Parity Error\n"); | |
548 | if (reason & MCSR_BUS_RPERR) | |
549 | printk("Bus - Read Parity Error\n"); | |
47c0bd1a BH |
550 | |
551 | return 0; | |
552 | } | |
4490c06b KG |
553 | |
554 | int machine_check_generic(struct pt_regs *regs) | |
555 | { | |
556 | return 0; | |
557 | } | |
47c0bd1a BH |
558 | #elif defined(CONFIG_E200) |
559 | int machine_check_e200(struct pt_regs *regs) | |
560 | { | |
561 | unsigned long reason = get_mc_reason(regs); | |
562 | ||
14cf11af PM |
563 | printk("Machine check in kernel mode.\n"); |
564 | printk("Caused by (from MCSR=%lx): ", reason); | |
565 | ||
566 | if (reason & MCSR_MCP) | |
567 | printk("Machine Check Signal\n"); | |
568 | if (reason & MCSR_CP_PERR) | |
569 | printk("Cache Push Parity Error\n"); | |
570 | if (reason & MCSR_CPERR) | |
571 | printk("Cache Parity Error\n"); | |
572 | if (reason & MCSR_EXCP_ERR) | |
573 | printk("ISI, ITLB, or Bus Error on first instruction fetch for an exception handler\n"); | |
574 | if (reason & MCSR_BUS_IRERR) | |
575 | printk("Bus - Read Bus Error on instruction fetch\n"); | |
576 | if (reason & MCSR_BUS_DRERR) | |
577 | printk("Bus - Read Bus Error on data load\n"); | |
578 | if (reason & MCSR_BUS_WRERR) | |
579 | printk("Bus - Write Bus Error on buffered store or cache line push\n"); | |
47c0bd1a BH |
580 | |
581 | return 0; | |
582 | } | |
583 | #else | |
584 | int machine_check_generic(struct pt_regs *regs) | |
585 | { | |
586 | unsigned long reason = get_mc_reason(regs); | |
587 | ||
14cf11af PM |
588 | printk("Machine check in kernel mode.\n"); |
589 | printk("Caused by (from SRR1=%lx): ", reason); | |
590 | switch (reason & 0x601F0000) { | |
591 | case 0x80000: | |
592 | printk("Machine check signal\n"); | |
593 | break; | |
594 | case 0: /* for 601 */ | |
595 | case 0x40000: | |
596 | case 0x140000: /* 7450 MSS error and TEA */ | |
597 | printk("Transfer error ack signal\n"); | |
598 | break; | |
599 | case 0x20000: | |
600 | printk("Data parity error signal\n"); | |
601 | break; | |
602 | case 0x10000: | |
603 | printk("Address parity error signal\n"); | |
604 | break; | |
605 | case 0x20000000: | |
606 | printk("L1 Data Cache error\n"); | |
607 | break; | |
608 | case 0x40000000: | |
609 | printk("L1 Instruction Cache error\n"); | |
610 | break; | |
611 | case 0x00100000: | |
612 | printk("L2 data cache parity error\n"); | |
613 | break; | |
614 | default: | |
615 | printk("Unknown values in msr\n"); | |
616 | } | |
75918a4b OJ |
617 | return 0; |
618 | } | |
47c0bd1a | 619 | #endif /* everything else */ |
75918a4b OJ |
620 | |
621 | void machine_check_exception(struct pt_regs *regs) | |
622 | { | |
623 | int recover = 0; | |
624 | ||
89713ed1 AB |
625 | __get_cpu_var(irq_stat).mce_exceptions++; |
626 | ||
47c0bd1a BH |
627 | /* See if any machine dependent calls. In theory, we would want |
628 | * to call the CPU first, and call the ppc_md. one if the CPU | |
629 | * one returns a positive number. However there is existing code | |
630 | * that assumes the board gets a first chance, so let's keep it | |
631 | * that way for now and fix things later. --BenH. | |
632 | */ | |
75918a4b OJ |
633 | if (ppc_md.machine_check_exception) |
634 | recover = ppc_md.machine_check_exception(regs); | |
47c0bd1a BH |
635 | else if (cur_cpu_spec->machine_check) |
636 | recover = cur_cpu_spec->machine_check(regs); | |
75918a4b | 637 | |
47c0bd1a | 638 | if (recover > 0) |
75918a4b OJ |
639 | return; |
640 | ||
75918a4b | 641 | #if defined(CONFIG_8xx) && defined(CONFIG_PCI) |
47c0bd1a BH |
642 | /* the qspan pci read routines can cause machine checks -- Cort |
643 | * | |
644 | * yuck !!! that totally needs to go away ! There are better ways | |
645 | * to deal with that than having a wart in the mcheck handler. | |
646 | * -- BenH | |
647 | */ | |
75918a4b OJ |
648 | bad_page_fault(regs, regs->dar, SIGBUS); |
649 | return; | |
650 | #endif | |
651 | ||
a443506b | 652 | if (debugger_fault_handler(regs)) |
75918a4b | 653 | return; |
75918a4b OJ |
654 | |
655 | if (check_io_access(regs)) | |
656 | return; | |
657 | ||
8dad3f92 | 658 | die("Machine check", regs, SIGBUS); |
14cf11af PM |
659 | |
660 | /* Must die if the interrupt is not recoverable */ | |
661 | if (!(regs->msr & MSR_RI)) | |
662 | panic("Unrecoverable Machine check"); | |
663 | } | |
664 | ||
665 | void SMIException(struct pt_regs *regs) | |
666 | { | |
667 | die("System Management Interrupt", regs, SIGABRT); | |
668 | } | |
669 | ||
dc1c1ca3 | 670 | void unknown_exception(struct pt_regs *regs) |
14cf11af PM |
671 | { |
672 | printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", | |
673 | regs->nip, regs->msr, regs->trap); | |
674 | ||
675 | _exception(SIGTRAP, regs, 0, 0); | |
676 | } | |
677 | ||
dc1c1ca3 | 678 | void instruction_breakpoint_exception(struct pt_regs *regs) |
14cf11af PM |
679 | { |
680 | if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5, | |
681 | 5, SIGTRAP) == NOTIFY_STOP) | |
682 | return; | |
683 | if (debugger_iabr_match(regs)) | |
684 | return; | |
685 | _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); | |
686 | } | |
687 | ||
688 | void RunModeException(struct pt_regs *regs) | |
689 | { | |
690 | _exception(SIGTRAP, regs, 0, 0); | |
691 | } | |
692 | ||
8dad3f92 | 693 | void __kprobes single_step_exception(struct pt_regs *regs) |
14cf11af | 694 | { |
2538c2d0 | 695 | clear_single_step(regs); |
14cf11af PM |
696 | |
697 | if (notify_die(DIE_SSTEP, "single_step", regs, 5, | |
698 | 5, SIGTRAP) == NOTIFY_STOP) | |
699 | return; | |
700 | if (debugger_sstep(regs)) | |
701 | return; | |
702 | ||
703 | _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); | |
704 | } | |
705 | ||
706 | /* | |
707 | * After we have successfully emulated an instruction, we have to | |
708 | * check if the instruction was being single-stepped, and if so, | |
709 | * pretend we got a single-step exception. This was pointed out | |
710 | * by Kumar Gala. -- paulus | |
711 | */ | |
8dad3f92 | 712 | static void emulate_single_step(struct pt_regs *regs) |
14cf11af | 713 | { |
2538c2d0 P |
714 | if (single_stepping(regs)) |
715 | single_step_exception(regs); | |
14cf11af PM |
716 | } |
717 | ||
5fad293b | 718 | static inline int __parse_fpscr(unsigned long fpscr) |
dc1c1ca3 | 719 | { |
5fad293b | 720 | int ret = 0; |
dc1c1ca3 SR |
721 | |
722 | /* Invalid operation */ | |
723 | if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX)) | |
5fad293b | 724 | ret = FPE_FLTINV; |
dc1c1ca3 SR |
725 | |
726 | /* Overflow */ | |
727 | else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX)) | |
5fad293b | 728 | ret = FPE_FLTOVF; |
dc1c1ca3 SR |
729 | |
730 | /* Underflow */ | |
731 | else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX)) | |
5fad293b | 732 | ret = FPE_FLTUND; |
dc1c1ca3 SR |
733 | |
734 | /* Divide by zero */ | |
735 | else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX)) | |
5fad293b | 736 | ret = FPE_FLTDIV; |
dc1c1ca3 SR |
737 | |
738 | /* Inexact result */ | |
739 | else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX)) | |
5fad293b KG |
740 | ret = FPE_FLTRES; |
741 | ||
742 | return ret; | |
743 | } | |
744 | ||
745 | static void parse_fpe(struct pt_regs *regs) | |
746 | { | |
747 | int code = 0; | |
748 | ||
749 | flush_fp_to_thread(current); | |
750 | ||
751 | code = __parse_fpscr(current->thread.fpscr.val); | |
dc1c1ca3 SR |
752 | |
753 | _exception(SIGFPE, regs, code, regs->nip); | |
754 | } | |
755 | ||
756 | /* | |
757 | * Illegal instruction emulation support. Originally written to | |
14cf11af PM |
758 | * provide the PVR to user applications using the mfspr rd, PVR. |
759 | * Return non-zero if we can't emulate, or -EFAULT if the associated | |
760 | * memory access caused an access fault. Return zero on success. | |
761 | * | |
762 | * There are a couple of ways to do this, either "decode" the instruction | |
763 | * or directly match lots of bits. In this case, matching lots of | |
764 | * bits is faster and easier. | |
86417780 | 765 | * |
14cf11af | 766 | */ |
14cf11af PM |
767 | static int emulate_string_inst(struct pt_regs *regs, u32 instword) |
768 | { | |
769 | u8 rT = (instword >> 21) & 0x1f; | |
770 | u8 rA = (instword >> 16) & 0x1f; | |
771 | u8 NB_RB = (instword >> 11) & 0x1f; | |
772 | u32 num_bytes; | |
773 | unsigned long EA; | |
774 | int pos = 0; | |
775 | ||
776 | /* Early out if we are an invalid form of lswx */ | |
16c57b36 | 777 | if ((instword & PPC_INST_STRING_MASK) == PPC_INST_LSWX) |
14cf11af PM |
778 | if ((rT == rA) || (rT == NB_RB)) |
779 | return -EINVAL; | |
780 | ||
781 | EA = (rA == 0) ? 0 : regs->gpr[rA]; | |
782 | ||
16c57b36 KG |
783 | switch (instword & PPC_INST_STRING_MASK) { |
784 | case PPC_INST_LSWX: | |
785 | case PPC_INST_STSWX: | |
14cf11af PM |
786 | EA += NB_RB; |
787 | num_bytes = regs->xer & 0x7f; | |
788 | break; | |
16c57b36 KG |
789 | case PPC_INST_LSWI: |
790 | case PPC_INST_STSWI: | |
14cf11af PM |
791 | num_bytes = (NB_RB == 0) ? 32 : NB_RB; |
792 | break; | |
793 | default: | |
794 | return -EINVAL; | |
795 | } | |
796 | ||
797 | while (num_bytes != 0) | |
798 | { | |
799 | u8 val; | |
800 | u32 shift = 8 * (3 - (pos & 0x3)); | |
801 | ||
16c57b36 KG |
802 | switch ((instword & PPC_INST_STRING_MASK)) { |
803 | case PPC_INST_LSWX: | |
804 | case PPC_INST_LSWI: | |
14cf11af PM |
805 | if (get_user(val, (u8 __user *)EA)) |
806 | return -EFAULT; | |
807 | /* first time updating this reg, | |
808 | * zero it out */ | |
809 | if (pos == 0) | |
810 | regs->gpr[rT] = 0; | |
811 | regs->gpr[rT] |= val << shift; | |
812 | break; | |
16c57b36 KG |
813 | case PPC_INST_STSWI: |
814 | case PPC_INST_STSWX: | |
14cf11af PM |
815 | val = regs->gpr[rT] >> shift; |
816 | if (put_user(val, (u8 __user *)EA)) | |
817 | return -EFAULT; | |
818 | break; | |
819 | } | |
820 | /* move EA to next address */ | |
821 | EA += 1; | |
822 | num_bytes--; | |
823 | ||
824 | /* manage our position within the register */ | |
825 | if (++pos == 4) { | |
826 | pos = 0; | |
827 | if (++rT == 32) | |
828 | rT = 0; | |
829 | } | |
830 | } | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
c3412dcb WS |
835 | static int emulate_popcntb_inst(struct pt_regs *regs, u32 instword) |
836 | { | |
837 | u32 ra,rs; | |
838 | unsigned long tmp; | |
839 | ||
840 | ra = (instword >> 16) & 0x1f; | |
841 | rs = (instword >> 21) & 0x1f; | |
842 | ||
843 | tmp = regs->gpr[rs]; | |
844 | tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL); | |
845 | tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL); | |
846 | tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL; | |
847 | regs->gpr[ra] = tmp; | |
848 | ||
849 | return 0; | |
850 | } | |
851 | ||
c1469f13 KG |
852 | static int emulate_isel(struct pt_regs *regs, u32 instword) |
853 | { | |
854 | u8 rT = (instword >> 21) & 0x1f; | |
855 | u8 rA = (instword >> 16) & 0x1f; | |
856 | u8 rB = (instword >> 11) & 0x1f; | |
857 | u8 BC = (instword >> 6) & 0x1f; | |
858 | u8 bit; | |
859 | unsigned long tmp; | |
860 | ||
861 | tmp = (rA == 0) ? 0 : regs->gpr[rA]; | |
862 | bit = (regs->ccr >> (31 - BC)) & 0x1; | |
863 | ||
864 | regs->gpr[rT] = bit ? tmp : regs->gpr[rB]; | |
865 | ||
866 | return 0; | |
867 | } | |
868 | ||
14cf11af PM |
869 | static int emulate_instruction(struct pt_regs *regs) |
870 | { | |
871 | u32 instword; | |
872 | u32 rd; | |
873 | ||
fab5db97 | 874 | if (!user_mode(regs) || (regs->msr & MSR_LE)) |
14cf11af PM |
875 | return -EINVAL; |
876 | CHECK_FULL_REGS(regs); | |
877 | ||
878 | if (get_user(instword, (u32 __user *)(regs->nip))) | |
879 | return -EFAULT; | |
880 | ||
881 | /* Emulate the mfspr rD, PVR. */ | |
16c57b36 | 882 | if ((instword & PPC_INST_MFSPR_PVR_MASK) == PPC_INST_MFSPR_PVR) { |
eecff81d | 883 | PPC_WARN_EMULATED(mfpvr, regs); |
14cf11af PM |
884 | rd = (instword >> 21) & 0x1f; |
885 | regs->gpr[rd] = mfspr(SPRN_PVR); | |
886 | return 0; | |
887 | } | |
888 | ||
889 | /* Emulating the dcba insn is just a no-op. */ | |
80947e7c | 890 | if ((instword & PPC_INST_DCBA_MASK) == PPC_INST_DCBA) { |
eecff81d | 891 | PPC_WARN_EMULATED(dcba, regs); |
14cf11af | 892 | return 0; |
80947e7c | 893 | } |
14cf11af PM |
894 | |
895 | /* Emulate the mcrxr insn. */ | |
16c57b36 | 896 | if ((instword & PPC_INST_MCRXR_MASK) == PPC_INST_MCRXR) { |
86417780 | 897 | int shift = (instword >> 21) & 0x1c; |
14cf11af PM |
898 | unsigned long msk = 0xf0000000UL >> shift; |
899 | ||
eecff81d | 900 | PPC_WARN_EMULATED(mcrxr, regs); |
14cf11af PM |
901 | regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk); |
902 | regs->xer &= ~0xf0000000UL; | |
903 | return 0; | |
904 | } | |
905 | ||
906 | /* Emulate load/store string insn. */ | |
80947e7c | 907 | if ((instword & PPC_INST_STRING_GEN_MASK) == PPC_INST_STRING) { |
eecff81d | 908 | PPC_WARN_EMULATED(string, regs); |
14cf11af | 909 | return emulate_string_inst(regs, instword); |
80947e7c | 910 | } |
14cf11af | 911 | |
c3412dcb | 912 | /* Emulate the popcntb (Population Count Bytes) instruction. */ |
16c57b36 | 913 | if ((instword & PPC_INST_POPCNTB_MASK) == PPC_INST_POPCNTB) { |
eecff81d | 914 | PPC_WARN_EMULATED(popcntb, regs); |
c3412dcb WS |
915 | return emulate_popcntb_inst(regs, instword); |
916 | } | |
917 | ||
c1469f13 | 918 | /* Emulate isel (Integer Select) instruction */ |
16c57b36 | 919 | if ((instword & PPC_INST_ISEL_MASK) == PPC_INST_ISEL) { |
eecff81d | 920 | PPC_WARN_EMULATED(isel, regs); |
c1469f13 KG |
921 | return emulate_isel(regs, instword); |
922 | } | |
923 | ||
efcac658 AK |
924 | #ifdef CONFIG_PPC64 |
925 | /* Emulate the mfspr rD, DSCR. */ | |
926 | if (((instword & PPC_INST_MFSPR_DSCR_MASK) == PPC_INST_MFSPR_DSCR) && | |
927 | cpu_has_feature(CPU_FTR_DSCR)) { | |
928 | PPC_WARN_EMULATED(mfdscr, regs); | |
929 | rd = (instword >> 21) & 0x1f; | |
930 | regs->gpr[rd] = mfspr(SPRN_DSCR); | |
931 | return 0; | |
932 | } | |
933 | /* Emulate the mtspr DSCR, rD. */ | |
934 | if (((instword & PPC_INST_MTSPR_DSCR_MASK) == PPC_INST_MTSPR_DSCR) && | |
935 | cpu_has_feature(CPU_FTR_DSCR)) { | |
936 | PPC_WARN_EMULATED(mtdscr, regs); | |
937 | rd = (instword >> 21) & 0x1f; | |
938 | mtspr(SPRN_DSCR, regs->gpr[rd]); | |
939 | current->thread.dscr_inherit = 1; | |
940 | return 0; | |
941 | } | |
942 | #endif | |
943 | ||
14cf11af PM |
944 | return -EINVAL; |
945 | } | |
946 | ||
73c9ceab | 947 | int is_valid_bugaddr(unsigned long addr) |
14cf11af | 948 | { |
73c9ceab | 949 | return is_kernel_addr(addr); |
14cf11af PM |
950 | } |
951 | ||
8dad3f92 | 952 | void __kprobes program_check_exception(struct pt_regs *regs) |
14cf11af PM |
953 | { |
954 | unsigned int reason = get_reason(regs); | |
955 | extern int do_mathemu(struct pt_regs *regs); | |
956 | ||
aa42c69c | 957 | /* We can now get here via a FP Unavailable exception if the core |
04903a30 | 958 | * has no FPU, in that case the reason flags will be 0 */ |
14cf11af | 959 | |
dc1c1ca3 SR |
960 | if (reason & REASON_FP) { |
961 | /* IEEE FP exception */ | |
962 | parse_fpe(regs); | |
8dad3f92 PM |
963 | return; |
964 | } | |
965 | if (reason & REASON_TRAP) { | |
ba797b28 JW |
966 | /* Debugger is first in line to stop recursive faults in |
967 | * rcu_lock, notify_die, or atomic_notifier_call_chain */ | |
968 | if (debugger_bpt(regs)) | |
969 | return; | |
970 | ||
14cf11af | 971 | /* trap exception */ |
dc1c1ca3 SR |
972 | if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP) |
973 | == NOTIFY_STOP) | |
974 | return; | |
73c9ceab JF |
975 | |
976 | if (!(regs->msr & MSR_PR) && /* not user-mode */ | |
608e2619 | 977 | report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) { |
14cf11af PM |
978 | regs->nip += 4; |
979 | return; | |
980 | } | |
8dad3f92 PM |
981 | _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); |
982 | return; | |
983 | } | |
984 | ||
cd8a5673 PM |
985 | local_irq_enable(); |
986 | ||
04903a30 KG |
987 | #ifdef CONFIG_MATH_EMULATION |
988 | /* (reason & REASON_ILLEGAL) would be the obvious thing here, | |
989 | * but there seems to be a hardware bug on the 405GP (RevD) | |
990 | * that means ESR is sometimes set incorrectly - either to | |
991 | * ESR_DST (!?) or 0. In the process of chasing this with the | |
992 | * hardware people - not sure if it can happen on any illegal | |
993 | * instruction or only on FP instructions, whether there is a | |
25985edc | 994 | * pattern to occurrences etc. -dgibson 31/Mar/2003 */ |
5fad293b KG |
995 | switch (do_mathemu(regs)) { |
996 | case 0: | |
04903a30 KG |
997 | emulate_single_step(regs); |
998 | return; | |
5fad293b KG |
999 | case 1: { |
1000 | int code = 0; | |
1001 | code = __parse_fpscr(current->thread.fpscr.val); | |
1002 | _exception(SIGFPE, regs, code, regs->nip); | |
1003 | return; | |
1004 | } | |
1005 | case -EFAULT: | |
1006 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
1007 | return; | |
04903a30 | 1008 | } |
5fad293b | 1009 | /* fall through on any other errors */ |
04903a30 KG |
1010 | #endif /* CONFIG_MATH_EMULATION */ |
1011 | ||
8dad3f92 PM |
1012 | /* Try to emulate it if we should. */ |
1013 | if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) { | |
14cf11af PM |
1014 | switch (emulate_instruction(regs)) { |
1015 | case 0: | |
1016 | regs->nip += 4; | |
1017 | emulate_single_step(regs); | |
8dad3f92 | 1018 | return; |
14cf11af PM |
1019 | case -EFAULT: |
1020 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
8dad3f92 | 1021 | return; |
14cf11af PM |
1022 | } |
1023 | } | |
8dad3f92 PM |
1024 | |
1025 | if (reason & REASON_PRIVILEGED) | |
1026 | _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); | |
1027 | else | |
1028 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
14cf11af PM |
1029 | } |
1030 | ||
dc1c1ca3 | 1031 | void alignment_exception(struct pt_regs *regs) |
14cf11af | 1032 | { |
4393c4f6 | 1033 | int sig, code, fixed = 0; |
14cf11af | 1034 | |
e9370ae1 PM |
1035 | /* we don't implement logging of alignment exceptions */ |
1036 | if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS)) | |
1037 | fixed = fix_alignment(regs); | |
14cf11af PM |
1038 | |
1039 | if (fixed == 1) { | |
1040 | regs->nip += 4; /* skip over emulated instruction */ | |
1041 | emulate_single_step(regs); | |
1042 | return; | |
1043 | } | |
1044 | ||
dc1c1ca3 | 1045 | /* Operand address was bad */ |
14cf11af | 1046 | if (fixed == -EFAULT) { |
4393c4f6 BH |
1047 | sig = SIGSEGV; |
1048 | code = SEGV_ACCERR; | |
1049 | } else { | |
1050 | sig = SIGBUS; | |
1051 | code = BUS_ADRALN; | |
14cf11af | 1052 | } |
4393c4f6 BH |
1053 | if (user_mode(regs)) |
1054 | _exception(sig, regs, code, regs->dar); | |
1055 | else | |
1056 | bad_page_fault(regs, regs->dar, sig); | |
14cf11af PM |
1057 | } |
1058 | ||
1059 | void StackOverflow(struct pt_regs *regs) | |
1060 | { | |
1061 | printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n", | |
1062 | current, regs->gpr[1]); | |
1063 | debugger(regs); | |
1064 | show_regs(regs); | |
1065 | panic("kernel stack overflow"); | |
1066 | } | |
1067 | ||
1068 | void nonrecoverable_exception(struct pt_regs *regs) | |
1069 | { | |
1070 | printk(KERN_ERR "Non-recoverable exception at PC=%lx MSR=%lx\n", | |
1071 | regs->nip, regs->msr); | |
1072 | debugger(regs); | |
1073 | die("nonrecoverable exception", regs, SIGKILL); | |
1074 | } | |
1075 | ||
1076 | void trace_syscall(struct pt_regs *regs) | |
1077 | { | |
1078 | printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n", | |
19c5870c | 1079 | current, task_pid_nr(current), regs->nip, regs->link, regs->gpr[0], |
14cf11af PM |
1080 | regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted()); |
1081 | } | |
dc1c1ca3 | 1082 | |
dc1c1ca3 SR |
1083 | void kernel_fp_unavailable_exception(struct pt_regs *regs) |
1084 | { | |
1085 | printk(KERN_EMERG "Unrecoverable FP Unavailable Exception " | |
1086 | "%lx at %lx\n", regs->trap, regs->nip); | |
1087 | die("Unrecoverable FP Unavailable Exception", regs, SIGABRT); | |
1088 | } | |
dc1c1ca3 SR |
1089 | |
1090 | void altivec_unavailable_exception(struct pt_regs *regs) | |
1091 | { | |
dc1c1ca3 SR |
1092 | if (user_mode(regs)) { |
1093 | /* A user program has executed an altivec instruction, | |
1094 | but this kernel doesn't support altivec. */ | |
1095 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1096 | return; | |
1097 | } | |
6c4841c2 | 1098 | |
dc1c1ca3 SR |
1099 | printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception " |
1100 | "%lx at %lx\n", regs->trap, regs->nip); | |
1101 | die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT); | |
dc1c1ca3 SR |
1102 | } |
1103 | ||
ce48b210 MN |
1104 | void vsx_unavailable_exception(struct pt_regs *regs) |
1105 | { | |
1106 | if (user_mode(regs)) { | |
1107 | /* A user program has executed an vsx instruction, | |
1108 | but this kernel doesn't support vsx. */ | |
1109 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1110 | return; | |
1111 | } | |
1112 | ||
1113 | printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception " | |
1114 | "%lx at %lx\n", regs->trap, regs->nip); | |
1115 | die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT); | |
1116 | } | |
1117 | ||
dc1c1ca3 SR |
1118 | void performance_monitor_exception(struct pt_regs *regs) |
1119 | { | |
89713ed1 AB |
1120 | __get_cpu_var(irq_stat).pmu_irqs++; |
1121 | ||
dc1c1ca3 SR |
1122 | perf_irq(regs); |
1123 | } | |
dc1c1ca3 | 1124 | |
8dad3f92 | 1125 | #ifdef CONFIG_8xx |
14cf11af PM |
1126 | void SoftwareEmulation(struct pt_regs *regs) |
1127 | { | |
1128 | extern int do_mathemu(struct pt_regs *); | |
1129 | extern int Soft_emulate_8xx(struct pt_regs *); | |
5dd57a13 | 1130 | #if defined(CONFIG_MATH_EMULATION) || defined(CONFIG_8XX_MINIMAL_FPEMU) |
14cf11af | 1131 | int errcode; |
5dd57a13 | 1132 | #endif |
14cf11af PM |
1133 | |
1134 | CHECK_FULL_REGS(regs); | |
1135 | ||
1136 | if (!user_mode(regs)) { | |
1137 | debugger(regs); | |
1138 | die("Kernel Mode Software FPU Emulation", regs, SIGFPE); | |
1139 | } | |
1140 | ||
1141 | #ifdef CONFIG_MATH_EMULATION | |
1142 | errcode = do_mathemu(regs); | |
80947e7c | 1143 | if (errcode >= 0) |
eecff81d | 1144 | PPC_WARN_EMULATED(math, regs); |
5fad293b KG |
1145 | |
1146 | switch (errcode) { | |
1147 | case 0: | |
1148 | emulate_single_step(regs); | |
1149 | return; | |
1150 | case 1: { | |
1151 | int code = 0; | |
1152 | code = __parse_fpscr(current->thread.fpscr.val); | |
1153 | _exception(SIGFPE, regs, code, regs->nip); | |
1154 | return; | |
1155 | } | |
1156 | case -EFAULT: | |
1157 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
1158 | return; | |
1159 | default: | |
1160 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1161 | return; | |
1162 | } | |
1163 | ||
5dd57a13 | 1164 | #elif defined(CONFIG_8XX_MINIMAL_FPEMU) |
14cf11af | 1165 | errcode = Soft_emulate_8xx(regs); |
80947e7c | 1166 | if (errcode >= 0) |
eecff81d | 1167 | PPC_WARN_EMULATED(8xx, regs); |
80947e7c | 1168 | |
5fad293b KG |
1169 | switch (errcode) { |
1170 | case 0: | |
14cf11af | 1171 | emulate_single_step(regs); |
5fad293b KG |
1172 | return; |
1173 | case 1: | |
1174 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1175 | return; | |
1176 | case -EFAULT: | |
1177 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
1178 | return; | |
1179 | } | |
5dd57a13 SW |
1180 | #else |
1181 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
5fad293b | 1182 | #endif |
14cf11af | 1183 | } |
8dad3f92 | 1184 | #endif /* CONFIG_8xx */ |
14cf11af | 1185 | |
172ae2e7 | 1186 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
3bffb652 DK |
1187 | static void handle_debug(struct pt_regs *regs, unsigned long debug_status) |
1188 | { | |
1189 | int changed = 0; | |
1190 | /* | |
1191 | * Determine the cause of the debug event, clear the | |
1192 | * event flags and send a trap to the handler. Torez | |
1193 | */ | |
1194 | if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) { | |
1195 | dbcr_dac(current) &= ~(DBCR_DAC1R | DBCR_DAC1W); | |
1196 | #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE | |
1197 | current->thread.dbcr2 &= ~DBCR2_DAC12MODE; | |
1198 | #endif | |
1199 | do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT, | |
1200 | 5); | |
1201 | changed |= 0x01; | |
1202 | } else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) { | |
1203 | dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W); | |
1204 | do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT, | |
1205 | 6); | |
1206 | changed |= 0x01; | |
1207 | } else if (debug_status & DBSR_IAC1) { | |
1208 | current->thread.dbcr0 &= ~DBCR0_IAC1; | |
1209 | dbcr_iac_range(current) &= ~DBCR_IAC12MODE; | |
1210 | do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT, | |
1211 | 1); | |
1212 | changed |= 0x01; | |
1213 | } else if (debug_status & DBSR_IAC2) { | |
1214 | current->thread.dbcr0 &= ~DBCR0_IAC2; | |
1215 | do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT, | |
1216 | 2); | |
1217 | changed |= 0x01; | |
1218 | } else if (debug_status & DBSR_IAC3) { | |
1219 | current->thread.dbcr0 &= ~DBCR0_IAC3; | |
1220 | dbcr_iac_range(current) &= ~DBCR_IAC34MODE; | |
1221 | do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT, | |
1222 | 3); | |
1223 | changed |= 0x01; | |
1224 | } else if (debug_status & DBSR_IAC4) { | |
1225 | current->thread.dbcr0 &= ~DBCR0_IAC4; | |
1226 | do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT, | |
1227 | 4); | |
1228 | changed |= 0x01; | |
1229 | } | |
1230 | /* | |
1231 | * At the point this routine was called, the MSR(DE) was turned off. | |
1232 | * Check all other debug flags and see if that bit needs to be turned | |
1233 | * back on or not. | |
1234 | */ | |
1235 | if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0, current->thread.dbcr1)) | |
1236 | regs->msr |= MSR_DE; | |
1237 | else | |
1238 | /* Make sure the IDM flag is off */ | |
1239 | current->thread.dbcr0 &= ~DBCR0_IDM; | |
1240 | ||
1241 | if (changed & 0x01) | |
1242 | mtspr(SPRN_DBCR0, current->thread.dbcr0); | |
1243 | } | |
14cf11af | 1244 | |
f8279621 | 1245 | void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status) |
14cf11af | 1246 | { |
3bffb652 DK |
1247 | current->thread.dbsr = debug_status; |
1248 | ||
ec097c84 RM |
1249 | /* Hack alert: On BookE, Branch Taken stops on the branch itself, while |
1250 | * on server, it stops on the target of the branch. In order to simulate | |
1251 | * the server behaviour, we thus restart right away with a single step | |
1252 | * instead of stopping here when hitting a BT | |
1253 | */ | |
1254 | if (debug_status & DBSR_BT) { | |
1255 | regs->msr &= ~MSR_DE; | |
1256 | ||
1257 | /* Disable BT */ | |
1258 | mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_BT); | |
1259 | /* Clear the BT event */ | |
1260 | mtspr(SPRN_DBSR, DBSR_BT); | |
1261 | ||
1262 | /* Do the single step trick only when coming from userspace */ | |
1263 | if (user_mode(regs)) { | |
1264 | current->thread.dbcr0 &= ~DBCR0_BT; | |
1265 | current->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC; | |
1266 | regs->msr |= MSR_DE; | |
1267 | return; | |
1268 | } | |
1269 | ||
1270 | if (notify_die(DIE_SSTEP, "block_step", regs, 5, | |
1271 | 5, SIGTRAP) == NOTIFY_STOP) { | |
1272 | return; | |
1273 | } | |
1274 | if (debugger_sstep(regs)) | |
1275 | return; | |
1276 | } else if (debug_status & DBSR_IC) { /* Instruction complete */ | |
14cf11af | 1277 | regs->msr &= ~MSR_DE; |
f8279621 KG |
1278 | |
1279 | /* Disable instruction completion */ | |
1280 | mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC); | |
1281 | /* Clear the instruction completion event */ | |
1282 | mtspr(SPRN_DBSR, DBSR_IC); | |
1283 | ||
1284 | if (notify_die(DIE_SSTEP, "single_step", regs, 5, | |
1285 | 5, SIGTRAP) == NOTIFY_STOP) { | |
1286 | return; | |
1287 | } | |
1288 | ||
1289 | if (debugger_sstep(regs)) | |
1290 | return; | |
1291 | ||
d6a61bfc | 1292 | if (user_mode(regs)) { |
3bffb652 DK |
1293 | current->thread.dbcr0 &= ~DBCR0_IC; |
1294 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS | |
1295 | if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0, | |
1296 | current->thread.dbcr1)) | |
1297 | regs->msr |= MSR_DE; | |
1298 | else | |
1299 | /* Make sure the IDM bit is off */ | |
1300 | current->thread.dbcr0 &= ~DBCR0_IDM; | |
1301 | #endif | |
d6a61bfc | 1302 | } |
3bffb652 DK |
1303 | |
1304 | _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); | |
1305 | } else | |
1306 | handle_debug(regs, debug_status); | |
14cf11af | 1307 | } |
172ae2e7 | 1308 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
14cf11af PM |
1309 | |
1310 | #if !defined(CONFIG_TAU_INT) | |
1311 | void TAUException(struct pt_regs *regs) | |
1312 | { | |
1313 | printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n", | |
1314 | regs->nip, regs->msr, regs->trap, print_tainted()); | |
1315 | } | |
1316 | #endif /* CONFIG_INT_TAU */ | |
14cf11af PM |
1317 | |
1318 | #ifdef CONFIG_ALTIVEC | |
dc1c1ca3 | 1319 | void altivec_assist_exception(struct pt_regs *regs) |
14cf11af PM |
1320 | { |
1321 | int err; | |
1322 | ||
14cf11af PM |
1323 | if (!user_mode(regs)) { |
1324 | printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode" | |
1325 | " at %lx\n", regs->nip); | |
8dad3f92 | 1326 | die("Kernel VMX/Altivec assist exception", regs, SIGILL); |
14cf11af PM |
1327 | } |
1328 | ||
dc1c1ca3 | 1329 | flush_altivec_to_thread(current); |
dc1c1ca3 | 1330 | |
eecff81d | 1331 | PPC_WARN_EMULATED(altivec, regs); |
14cf11af PM |
1332 | err = emulate_altivec(regs); |
1333 | if (err == 0) { | |
1334 | regs->nip += 4; /* skip emulated instruction */ | |
1335 | emulate_single_step(regs); | |
1336 | return; | |
1337 | } | |
1338 | ||
1339 | if (err == -EFAULT) { | |
1340 | /* got an error reading the instruction */ | |
1341 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1342 | } else { | |
1343 | /* didn't recognize the instruction */ | |
1344 | /* XXX quick hack for now: set the non-Java bit in the VSCR */ | |
76462232 CD |
1345 | printk_ratelimited(KERN_ERR "Unrecognized altivec instruction " |
1346 | "in %s at %lx\n", current->comm, regs->nip); | |
14cf11af PM |
1347 | current->thread.vscr.u[3] |= 0x10000; |
1348 | } | |
1349 | } | |
1350 | #endif /* CONFIG_ALTIVEC */ | |
1351 | ||
ce48b210 MN |
1352 | #ifdef CONFIG_VSX |
1353 | void vsx_assist_exception(struct pt_regs *regs) | |
1354 | { | |
1355 | if (!user_mode(regs)) { | |
1356 | printk(KERN_EMERG "VSX assist exception in kernel mode" | |
1357 | " at %lx\n", regs->nip); | |
1358 | die("Kernel VSX assist exception", regs, SIGILL); | |
1359 | } | |
1360 | ||
1361 | flush_vsx_to_thread(current); | |
1362 | printk(KERN_INFO "VSX assist not supported at %lx\n", regs->nip); | |
1363 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1364 | } | |
1365 | #endif /* CONFIG_VSX */ | |
1366 | ||
14cf11af PM |
1367 | #ifdef CONFIG_FSL_BOOKE |
1368 | void CacheLockingException(struct pt_regs *regs, unsigned long address, | |
1369 | unsigned long error_code) | |
1370 | { | |
1371 | /* We treat cache locking instructions from the user | |
1372 | * as priv ops, in the future we could try to do | |
1373 | * something smarter | |
1374 | */ | |
1375 | if (error_code & (ESR_DLK|ESR_ILK)) | |
1376 | _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); | |
1377 | return; | |
1378 | } | |
1379 | #endif /* CONFIG_FSL_BOOKE */ | |
1380 | ||
1381 | #ifdef CONFIG_SPE | |
1382 | void SPEFloatingPointException(struct pt_regs *regs) | |
1383 | { | |
6a800f36 | 1384 | extern int do_spe_mathemu(struct pt_regs *regs); |
14cf11af PM |
1385 | unsigned long spefscr; |
1386 | int fpexc_mode; | |
1387 | int code = 0; | |
6a800f36 LY |
1388 | int err; |
1389 | ||
685659ee | 1390 | flush_spe_to_thread(current); |
14cf11af PM |
1391 | |
1392 | spefscr = current->thread.spefscr; | |
1393 | fpexc_mode = current->thread.fpexc_mode; | |
1394 | ||
14cf11af PM |
1395 | if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) { |
1396 | code = FPE_FLTOVF; | |
14cf11af PM |
1397 | } |
1398 | else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) { | |
1399 | code = FPE_FLTUND; | |
14cf11af PM |
1400 | } |
1401 | else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV)) | |
1402 | code = FPE_FLTDIV; | |
1403 | else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) { | |
1404 | code = FPE_FLTINV; | |
14cf11af PM |
1405 | } |
1406 | else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES)) | |
1407 | code = FPE_FLTRES; | |
1408 | ||
6a800f36 LY |
1409 | err = do_spe_mathemu(regs); |
1410 | if (err == 0) { | |
1411 | regs->nip += 4; /* skip emulated instruction */ | |
1412 | emulate_single_step(regs); | |
1413 | return; | |
1414 | } | |
1415 | ||
1416 | if (err == -EFAULT) { | |
1417 | /* got an error reading the instruction */ | |
1418 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1419 | } else if (err == -EINVAL) { | |
1420 | /* didn't recognize the instruction */ | |
1421 | printk(KERN_ERR "unrecognized spe instruction " | |
1422 | "in %s at %lx\n", current->comm, regs->nip); | |
1423 | } else { | |
1424 | _exception(SIGFPE, regs, code, regs->nip); | |
1425 | } | |
14cf11af | 1426 | |
14cf11af PM |
1427 | return; |
1428 | } | |
6a800f36 LY |
1429 | |
1430 | void SPEFloatingPointRoundException(struct pt_regs *regs) | |
1431 | { | |
1432 | extern int speround_handler(struct pt_regs *regs); | |
1433 | int err; | |
1434 | ||
1435 | preempt_disable(); | |
1436 | if (regs->msr & MSR_SPE) | |
1437 | giveup_spe(current); | |
1438 | preempt_enable(); | |
1439 | ||
1440 | regs->nip -= 4; | |
1441 | err = speround_handler(regs); | |
1442 | if (err == 0) { | |
1443 | regs->nip += 4; /* skip emulated instruction */ | |
1444 | emulate_single_step(regs); | |
1445 | return; | |
1446 | } | |
1447 | ||
1448 | if (err == -EFAULT) { | |
1449 | /* got an error reading the instruction */ | |
1450 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1451 | } else if (err == -EINVAL) { | |
1452 | /* didn't recognize the instruction */ | |
1453 | printk(KERN_ERR "unrecognized spe instruction " | |
1454 | "in %s at %lx\n", current->comm, regs->nip); | |
1455 | } else { | |
1456 | _exception(SIGFPE, regs, 0, regs->nip); | |
1457 | return; | |
1458 | } | |
1459 | } | |
14cf11af PM |
1460 | #endif |
1461 | ||
dc1c1ca3 SR |
1462 | /* |
1463 | * We enter here if we get an unrecoverable exception, that is, one | |
1464 | * that happened at a point where the RI (recoverable interrupt) bit | |
1465 | * in the MSR is 0. This indicates that SRR0/1 are live, and that | |
1466 | * we therefore lost state by taking this exception. | |
1467 | */ | |
1468 | void unrecoverable_exception(struct pt_regs *regs) | |
1469 | { | |
1470 | printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n", | |
1471 | regs->trap, regs->nip); | |
1472 | die("Unrecoverable exception", regs, SIGABRT); | |
1473 | } | |
dc1c1ca3 | 1474 | |
14cf11af PM |
1475 | #ifdef CONFIG_BOOKE_WDT |
1476 | /* | |
1477 | * Default handler for a Watchdog exception, | |
1478 | * spins until a reboot occurs | |
1479 | */ | |
1480 | void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs) | |
1481 | { | |
1482 | /* Generic WatchdogHandler, implement your own */ | |
1483 | mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE)); | |
1484 | return; | |
1485 | } | |
1486 | ||
1487 | void WatchdogException(struct pt_regs *regs) | |
1488 | { | |
1489 | printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n"); | |
1490 | WatchdogHandler(regs); | |
1491 | } | |
1492 | #endif | |
dc1c1ca3 | 1493 | |
dc1c1ca3 SR |
1494 | /* |
1495 | * We enter here if we discover during exception entry that we are | |
1496 | * running in supervisor mode with a userspace value in the stack pointer. | |
1497 | */ | |
1498 | void kernel_bad_stack(struct pt_regs *regs) | |
1499 | { | |
1500 | printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n", | |
1501 | regs->gpr[1], regs->nip); | |
1502 | die("Bad kernel stack pointer", regs, SIGABRT); | |
1503 | } | |
14cf11af PM |
1504 | |
1505 | void __init trap_init(void) | |
1506 | { | |
1507 | } | |
80947e7c GU |
1508 | |
1509 | ||
1510 | #ifdef CONFIG_PPC_EMULATED_STATS | |
1511 | ||
1512 | #define WARN_EMULATED_SETUP(type) .type = { .name = #type } | |
1513 | ||
1514 | struct ppc_emulated ppc_emulated = { | |
1515 | #ifdef CONFIG_ALTIVEC | |
1516 | WARN_EMULATED_SETUP(altivec), | |
1517 | #endif | |
1518 | WARN_EMULATED_SETUP(dcba), | |
1519 | WARN_EMULATED_SETUP(dcbz), | |
1520 | WARN_EMULATED_SETUP(fp_pair), | |
1521 | WARN_EMULATED_SETUP(isel), | |
1522 | WARN_EMULATED_SETUP(mcrxr), | |
1523 | WARN_EMULATED_SETUP(mfpvr), | |
1524 | WARN_EMULATED_SETUP(multiple), | |
1525 | WARN_EMULATED_SETUP(popcntb), | |
1526 | WARN_EMULATED_SETUP(spe), | |
1527 | WARN_EMULATED_SETUP(string), | |
1528 | WARN_EMULATED_SETUP(unaligned), | |
1529 | #ifdef CONFIG_MATH_EMULATION | |
1530 | WARN_EMULATED_SETUP(math), | |
1531 | #elif defined(CONFIG_8XX_MINIMAL_FPEMU) | |
1532 | WARN_EMULATED_SETUP(8xx), | |
1533 | #endif | |
1534 | #ifdef CONFIG_VSX | |
1535 | WARN_EMULATED_SETUP(vsx), | |
1536 | #endif | |
efcac658 AK |
1537 | #ifdef CONFIG_PPC64 |
1538 | WARN_EMULATED_SETUP(mfdscr), | |
1539 | WARN_EMULATED_SETUP(mtdscr), | |
1540 | #endif | |
80947e7c GU |
1541 | }; |
1542 | ||
1543 | u32 ppc_warn_emulated; | |
1544 | ||
1545 | void ppc_warn_emulated_print(const char *type) | |
1546 | { | |
76462232 CD |
1547 | pr_warn_ratelimited("%s used emulated %s instruction\n", current->comm, |
1548 | type); | |
80947e7c GU |
1549 | } |
1550 | ||
1551 | static int __init ppc_warn_emulated_init(void) | |
1552 | { | |
1553 | struct dentry *dir, *d; | |
1554 | unsigned int i; | |
1555 | struct ppc_emulated_entry *entries = (void *)&ppc_emulated; | |
1556 | ||
1557 | if (!powerpc_debugfs_root) | |
1558 | return -ENODEV; | |
1559 | ||
1560 | dir = debugfs_create_dir("emulated_instructions", | |
1561 | powerpc_debugfs_root); | |
1562 | if (!dir) | |
1563 | return -ENOMEM; | |
1564 | ||
1565 | d = debugfs_create_u32("do_warn", S_IRUGO | S_IWUSR, dir, | |
1566 | &ppc_warn_emulated); | |
1567 | if (!d) | |
1568 | goto fail; | |
1569 | ||
1570 | for (i = 0; i < sizeof(ppc_emulated)/sizeof(*entries); i++) { | |
1571 | d = debugfs_create_u32(entries[i].name, S_IRUGO | S_IWUSR, dir, | |
1572 | (u32 *)&entries[i].val.counter); | |
1573 | if (!d) | |
1574 | goto fail; | |
1575 | } | |
1576 | ||
1577 | return 0; | |
1578 | ||
1579 | fail: | |
1580 | debugfs_remove_recursive(dir); | |
1581 | return -ENOMEM; | |
1582 | } | |
1583 | ||
1584 | device_initcall(ppc_warn_emulated_init); | |
1585 | ||
1586 | #endif /* CONFIG_PPC_EMULATED_STATS */ |