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> |
ebaeb5ae | 60 | #include <asm/fadump.h> |
dc1c1ca3 | 61 | |
7dbb922c | 62 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
5be3492f AB |
63 | int (*__debugger)(struct pt_regs *regs) __read_mostly; |
64 | int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly; | |
65 | int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly; | |
66 | int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly; | |
67 | int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly; | |
68 | int (*__debugger_dabr_match)(struct pt_regs *regs) __read_mostly; | |
69 | int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly; | |
14cf11af PM |
70 | |
71 | EXPORT_SYMBOL(__debugger); | |
72 | EXPORT_SYMBOL(__debugger_ipi); | |
73 | EXPORT_SYMBOL(__debugger_bpt); | |
74 | EXPORT_SYMBOL(__debugger_sstep); | |
75 | EXPORT_SYMBOL(__debugger_iabr_match); | |
76 | EXPORT_SYMBOL(__debugger_dabr_match); | |
77 | EXPORT_SYMBOL(__debugger_fault_handler); | |
78 | #endif | |
79 | ||
14cf11af PM |
80 | /* |
81 | * Trap & Exception support | |
82 | */ | |
83 | ||
6031d9d9 | 84 | #ifdef CONFIG_PMAC_BACKLIGHT |
85 | static void pmac_backlight_unblank(void) | |
86 | { | |
87 | mutex_lock(&pmac_backlight_mutex); | |
88 | if (pmac_backlight) { | |
89 | struct backlight_properties *props; | |
90 | ||
91 | props = &pmac_backlight->props; | |
92 | props->brightness = props->max_brightness; | |
93 | props->power = FB_BLANK_UNBLANK; | |
94 | backlight_update_status(pmac_backlight); | |
95 | } | |
96 | mutex_unlock(&pmac_backlight_mutex); | |
97 | } | |
98 | #else | |
99 | static inline void pmac_backlight_unblank(void) { } | |
100 | #endif | |
101 | ||
760ca4dc AB |
102 | static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
103 | static int die_owner = -1; | |
104 | static unsigned int die_nest_count; | |
105 | static int die_counter; | |
106 | ||
107 | static unsigned __kprobes long oops_begin(struct pt_regs *regs) | |
14cf11af | 108 | { |
760ca4dc | 109 | int cpu; |
34c2a14f | 110 | unsigned long flags; |
14cf11af PM |
111 | |
112 | if (debugger(regs)) | |
113 | return 1; | |
114 | ||
293e4688 | 115 | oops_enter(); |
116 | ||
760ca4dc AB |
117 | /* racy, but better than risking deadlock. */ |
118 | raw_local_irq_save(flags); | |
119 | cpu = smp_processor_id(); | |
120 | if (!arch_spin_trylock(&die_lock)) { | |
121 | if (cpu == die_owner) | |
122 | /* nested oops. should stop eventually */; | |
123 | else | |
124 | arch_spin_lock(&die_lock); | |
34c2a14f | 125 | } |
760ca4dc AB |
126 | die_nest_count++; |
127 | die_owner = cpu; | |
128 | console_verbose(); | |
129 | bust_spinlocks(1); | |
130 | if (machine_is(powermac)) | |
131 | pmac_backlight_unblank(); | |
132 | return flags; | |
133 | } | |
e8222502 | 134 | |
760ca4dc AB |
135 | static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, |
136 | int signr) | |
137 | { | |
14cf11af | 138 | bust_spinlocks(0); |
760ca4dc | 139 | die_owner = -1; |
bcdcd8e7 | 140 | add_taint(TAINT_DIE); |
760ca4dc | 141 | die_nest_count--; |
58154c8c AB |
142 | oops_exit(); |
143 | printk("\n"); | |
760ca4dc AB |
144 | if (!die_nest_count) |
145 | /* Nest count reaches zero, release the lock. */ | |
146 | arch_spin_unlock(&die_lock); | |
147 | raw_local_irq_restore(flags); | |
cc532915 | 148 | |
ebaeb5ae MS |
149 | crash_fadump(regs, "die oops"); |
150 | ||
9b00ac06 AB |
151 | /* |
152 | * A system reset (0x100) is a request to dump, so we always send | |
153 | * it through the crashdump code. | |
154 | */ | |
155 | if (kexec_should_crash(current) || (TRAP(regs) == 0x100)) { | |
cc532915 | 156 | crash_kexec(regs); |
9b00ac06 AB |
157 | |
158 | /* | |
159 | * We aren't the primary crash CPU. We need to send it | |
160 | * to a holding pattern to avoid it ending up in the panic | |
161 | * code. | |
162 | */ | |
163 | crash_kexec_secondary(regs); | |
164 | } | |
14cf11af | 165 | |
760ca4dc AB |
166 | if (!signr) |
167 | return; | |
168 | ||
58154c8c AB |
169 | /* |
170 | * While our oops output is serialised by a spinlock, output | |
171 | * from panic() called below can race and corrupt it. If we | |
172 | * know we are going to panic, delay for 1 second so we have a | |
173 | * chance to get clean backtraces from all CPUs that are oopsing. | |
174 | */ | |
175 | if (in_interrupt() || panic_on_oops || !current->pid || | |
176 | is_global_init(current)) { | |
177 | mdelay(MSEC_PER_SEC); | |
178 | } | |
179 | ||
14cf11af PM |
180 | if (in_interrupt()) |
181 | panic("Fatal exception in interrupt"); | |
cea6a4ba | 182 | if (panic_on_oops) |
012c437d | 183 | panic("Fatal exception"); |
760ca4dc AB |
184 | do_exit(signr); |
185 | } | |
cea6a4ba | 186 | |
760ca4dc AB |
187 | static int __kprobes __die(const char *str, struct pt_regs *regs, long err) |
188 | { | |
189 | printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter); | |
190 | #ifdef CONFIG_PREEMPT | |
191 | printk("PREEMPT "); | |
192 | #endif | |
193 | #ifdef CONFIG_SMP | |
194 | printk("SMP NR_CPUS=%d ", NR_CPUS); | |
195 | #endif | |
196 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
197 | printk("DEBUG_PAGEALLOC "); | |
198 | #endif | |
199 | #ifdef CONFIG_NUMA | |
200 | printk("NUMA "); | |
201 | #endif | |
202 | printk("%s\n", ppc_md.name ? ppc_md.name : ""); | |
203 | ||
204 | if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV) == NOTIFY_STOP) | |
205 | return 1; | |
206 | ||
207 | print_modules(); | |
208 | show_regs(regs); | |
14cf11af PM |
209 | |
210 | return 0; | |
211 | } | |
212 | ||
760ca4dc AB |
213 | void die(const char *str, struct pt_regs *regs, long err) |
214 | { | |
215 | unsigned long flags = oops_begin(regs); | |
216 | ||
217 | if (__die(str, regs, err)) | |
218 | err = 0; | |
219 | oops_end(flags, regs, err); | |
220 | } | |
221 | ||
25baa35b ON |
222 | void user_single_step_siginfo(struct task_struct *tsk, |
223 | struct pt_regs *regs, siginfo_t *info) | |
224 | { | |
225 | memset(info, 0, sizeof(*info)); | |
226 | info->si_signo = SIGTRAP; | |
227 | info->si_code = TRAP_TRACE; | |
228 | info->si_addr = (void __user *)regs->nip; | |
229 | } | |
230 | ||
14cf11af PM |
231 | void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) |
232 | { | |
233 | siginfo_t info; | |
d0c3d534 OJ |
234 | const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \ |
235 | "at %08lx nip %08lx lr %08lx code %x\n"; | |
236 | const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \ | |
237 | "at %016lx nip %016lx lr %016lx code %x\n"; | |
14cf11af PM |
238 | |
239 | if (!user_mode(regs)) { | |
760ca4dc AB |
240 | die("Exception in kernel mode", regs, signr); |
241 | return; | |
242 | } | |
243 | ||
244 | if (show_unhandled_signals && unhandled_signal(current, signr)) { | |
76462232 CD |
245 | printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32, |
246 | current->comm, current->pid, signr, | |
247 | addr, regs->nip, regs->link, code); | |
248 | } | |
14cf11af PM |
249 | |
250 | memset(&info, 0, sizeof(info)); | |
251 | info.si_signo = signr; | |
252 | info.si_code = code; | |
253 | info.si_addr = (void __user *) addr; | |
254 | force_sig_info(signr, &info, current); | |
14cf11af PM |
255 | } |
256 | ||
257 | #ifdef CONFIG_PPC64 | |
258 | void system_reset_exception(struct pt_regs *regs) | |
259 | { | |
260 | /* See if any machine dependent calls */ | |
c902be71 AB |
261 | if (ppc_md.system_reset_exception) { |
262 | if (ppc_md.system_reset_exception(regs)) | |
263 | return; | |
264 | } | |
14cf11af | 265 | |
8dad3f92 | 266 | die("System Reset", regs, SIGABRT); |
14cf11af PM |
267 | |
268 | /* Must die if the interrupt is not recoverable */ | |
269 | if (!(regs->msr & MSR_RI)) | |
270 | panic("Unrecoverable System Reset"); | |
271 | ||
272 | /* What should we do here? We could issue a shutdown or hard reset. */ | |
273 | } | |
274 | #endif | |
275 | ||
276 | /* | |
277 | * I/O accesses can cause machine checks on powermacs. | |
278 | * Check if the NIP corresponds to the address of a sync | |
279 | * instruction for which there is an entry in the exception | |
280 | * table. | |
281 | * Note that the 601 only takes a machine check on TEA | |
282 | * (transfer error ack) signal assertion, and does not | |
283 | * set any of the top 16 bits of SRR1. | |
284 | * -- paulus. | |
285 | */ | |
286 | static inline int check_io_access(struct pt_regs *regs) | |
287 | { | |
68a64357 | 288 | #ifdef CONFIG_PPC32 |
14cf11af PM |
289 | unsigned long msr = regs->msr; |
290 | const struct exception_table_entry *entry; | |
291 | unsigned int *nip = (unsigned int *)regs->nip; | |
292 | ||
293 | if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000))) | |
294 | && (entry = search_exception_tables(regs->nip)) != NULL) { | |
295 | /* | |
296 | * Check that it's a sync instruction, or somewhere | |
297 | * in the twi; isync; nop sequence that inb/inw/inl uses. | |
298 | * As the address is in the exception table | |
299 | * we should be able to read the instr there. | |
300 | * For the debug message, we look at the preceding | |
301 | * load or store. | |
302 | */ | |
303 | if (*nip == 0x60000000) /* nop */ | |
304 | nip -= 2; | |
305 | else if (*nip == 0x4c00012c) /* isync */ | |
306 | --nip; | |
307 | if (*nip == 0x7c0004ac || (*nip >> 26) == 3) { | |
308 | /* sync or twi */ | |
309 | unsigned int rb; | |
310 | ||
311 | --nip; | |
312 | rb = (*nip >> 11) & 0x1f; | |
313 | printk(KERN_DEBUG "%s bad port %lx at %p\n", | |
314 | (*nip & 0x100)? "OUT to": "IN from", | |
315 | regs->gpr[rb] - _IO_BASE, nip); | |
316 | regs->msr |= MSR_RI; | |
317 | regs->nip = entry->fixup; | |
318 | return 1; | |
319 | } | |
320 | } | |
68a64357 | 321 | #endif /* CONFIG_PPC32 */ |
14cf11af PM |
322 | return 0; |
323 | } | |
324 | ||
172ae2e7 | 325 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
14cf11af PM |
326 | /* On 4xx, the reason for the machine check or program exception |
327 | is in the ESR. */ | |
328 | #define get_reason(regs) ((regs)->dsisr) | |
329 | #ifndef CONFIG_FSL_BOOKE | |
330 | #define get_mc_reason(regs) ((regs)->dsisr) | |
331 | #else | |
fe04b112 | 332 | #define get_mc_reason(regs) (mfspr(SPRN_MCSR)) |
14cf11af PM |
333 | #endif |
334 | #define REASON_FP ESR_FP | |
335 | #define REASON_ILLEGAL (ESR_PIL | ESR_PUO) | |
336 | #define REASON_PRIVILEGED ESR_PPR | |
337 | #define REASON_TRAP ESR_PTR | |
338 | ||
339 | /* single-step stuff */ | |
340 | #define single_stepping(regs) (current->thread.dbcr0 & DBCR0_IC) | |
341 | #define clear_single_step(regs) (current->thread.dbcr0 &= ~DBCR0_IC) | |
342 | ||
343 | #else | |
344 | /* On non-4xx, the reason for the machine check or program | |
345 | exception is in the MSR. */ | |
346 | #define get_reason(regs) ((regs)->msr) | |
347 | #define get_mc_reason(regs) ((regs)->msr) | |
348 | #define REASON_FP 0x100000 | |
349 | #define REASON_ILLEGAL 0x80000 | |
350 | #define REASON_PRIVILEGED 0x40000 | |
351 | #define REASON_TRAP 0x20000 | |
352 | ||
353 | #define single_stepping(regs) ((regs)->msr & MSR_SE) | |
354 | #define clear_single_step(regs) ((regs)->msr &= ~MSR_SE) | |
355 | #endif | |
356 | ||
47c0bd1a BH |
357 | #if defined(CONFIG_4xx) |
358 | int machine_check_4xx(struct pt_regs *regs) | |
14cf11af | 359 | { |
1a6a4ffe | 360 | unsigned long reason = get_mc_reason(regs); |
14cf11af | 361 | |
14cf11af PM |
362 | if (reason & ESR_IMCP) { |
363 | printk("Instruction"); | |
364 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
365 | } else | |
366 | printk("Data"); | |
367 | printk(" machine check in kernel mode.\n"); | |
47c0bd1a BH |
368 | |
369 | return 0; | |
370 | } | |
371 | ||
372 | int machine_check_440A(struct pt_regs *regs) | |
373 | { | |
374 | unsigned long reason = get_mc_reason(regs); | |
375 | ||
14cf11af PM |
376 | printk("Machine check in kernel mode.\n"); |
377 | if (reason & ESR_IMCP){ | |
378 | printk("Instruction Synchronous Machine Check exception\n"); | |
379 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
380 | } | |
381 | else { | |
382 | u32 mcsr = mfspr(SPRN_MCSR); | |
383 | if (mcsr & MCSR_IB) | |
384 | printk("Instruction Read PLB Error\n"); | |
385 | if (mcsr & MCSR_DRB) | |
386 | printk("Data Read PLB Error\n"); | |
387 | if (mcsr & MCSR_DWB) | |
388 | printk("Data Write PLB Error\n"); | |
389 | if (mcsr & MCSR_TLBP) | |
390 | printk("TLB Parity Error\n"); | |
391 | if (mcsr & MCSR_ICP){ | |
392 | flush_instruction_cache(); | |
393 | printk("I-Cache Parity Error\n"); | |
394 | } | |
395 | if (mcsr & MCSR_DCSP) | |
396 | printk("D-Cache Search Parity Error\n"); | |
397 | if (mcsr & MCSR_DCFP) | |
398 | printk("D-Cache Flush Parity Error\n"); | |
399 | if (mcsr & MCSR_IMPE) | |
400 | printk("Machine Check exception is imprecise\n"); | |
401 | ||
402 | /* Clear MCSR */ | |
403 | mtspr(SPRN_MCSR, mcsr); | |
404 | } | |
47c0bd1a BH |
405 | return 0; |
406 | } | |
fc5e7097 DK |
407 | |
408 | int machine_check_47x(struct pt_regs *regs) | |
409 | { | |
410 | unsigned long reason = get_mc_reason(regs); | |
411 | u32 mcsr; | |
412 | ||
413 | printk(KERN_ERR "Machine check in kernel mode.\n"); | |
414 | if (reason & ESR_IMCP) { | |
415 | printk(KERN_ERR | |
416 | "Instruction Synchronous Machine Check exception\n"); | |
417 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
418 | return 0; | |
419 | } | |
420 | mcsr = mfspr(SPRN_MCSR); | |
421 | if (mcsr & MCSR_IB) | |
422 | printk(KERN_ERR "Instruction Read PLB Error\n"); | |
423 | if (mcsr & MCSR_DRB) | |
424 | printk(KERN_ERR "Data Read PLB Error\n"); | |
425 | if (mcsr & MCSR_DWB) | |
426 | printk(KERN_ERR "Data Write PLB Error\n"); | |
427 | if (mcsr & MCSR_TLBP) | |
428 | printk(KERN_ERR "TLB Parity Error\n"); | |
429 | if (mcsr & MCSR_ICP) { | |
430 | flush_instruction_cache(); | |
431 | printk(KERN_ERR "I-Cache Parity Error\n"); | |
432 | } | |
433 | if (mcsr & MCSR_DCSP) | |
434 | printk(KERN_ERR "D-Cache Search Parity Error\n"); | |
435 | if (mcsr & PPC47x_MCSR_GPR) | |
436 | printk(KERN_ERR "GPR Parity Error\n"); | |
437 | if (mcsr & PPC47x_MCSR_FPR) | |
438 | printk(KERN_ERR "FPR Parity Error\n"); | |
439 | if (mcsr & PPC47x_MCSR_IPR) | |
440 | printk(KERN_ERR "Machine Check exception is imprecise\n"); | |
441 | ||
442 | /* Clear MCSR */ | |
443 | mtspr(SPRN_MCSR, mcsr); | |
444 | ||
445 | return 0; | |
446 | } | |
47c0bd1a | 447 | #elif defined(CONFIG_E500) |
fe04b112 SW |
448 | int machine_check_e500mc(struct pt_regs *regs) |
449 | { | |
450 | unsigned long mcsr = mfspr(SPRN_MCSR); | |
451 | unsigned long reason = mcsr; | |
452 | int recoverable = 1; | |
453 | ||
82a9a480 | 454 | if (reason & MCSR_LD) { |
cce1f106 SX |
455 | recoverable = fsl_rio_mcheck_exception(regs); |
456 | if (recoverable == 1) | |
457 | goto silent_out; | |
458 | } | |
459 | ||
fe04b112 SW |
460 | printk("Machine check in kernel mode.\n"); |
461 | printk("Caused by (from MCSR=%lx): ", reason); | |
462 | ||
463 | if (reason & MCSR_MCP) | |
464 | printk("Machine Check Signal\n"); | |
465 | ||
466 | if (reason & MCSR_ICPERR) { | |
467 | printk("Instruction Cache Parity Error\n"); | |
468 | ||
469 | /* | |
470 | * This is recoverable by invalidating the i-cache. | |
471 | */ | |
472 | mtspr(SPRN_L1CSR1, mfspr(SPRN_L1CSR1) | L1CSR1_ICFI); | |
473 | while (mfspr(SPRN_L1CSR1) & L1CSR1_ICFI) | |
474 | ; | |
475 | ||
476 | /* | |
477 | * This will generally be accompanied by an instruction | |
478 | * fetch error report -- only treat MCSR_IF as fatal | |
479 | * if it wasn't due to an L1 parity error. | |
480 | */ | |
481 | reason &= ~MCSR_IF; | |
482 | } | |
483 | ||
484 | if (reason & MCSR_DCPERR_MC) { | |
485 | printk("Data Cache Parity Error\n"); | |
37caf9f2 KG |
486 | |
487 | /* | |
488 | * In write shadow mode we auto-recover from the error, but it | |
489 | * may still get logged and cause a machine check. We should | |
490 | * only treat the non-write shadow case as non-recoverable. | |
491 | */ | |
492 | if (!(mfspr(SPRN_L1CSR2) & L1CSR2_DCWS)) | |
493 | recoverable = 0; | |
fe04b112 SW |
494 | } |
495 | ||
496 | if (reason & MCSR_L2MMU_MHIT) { | |
497 | printk("Hit on multiple TLB entries\n"); | |
498 | recoverable = 0; | |
499 | } | |
500 | ||
501 | if (reason & MCSR_NMI) | |
502 | printk("Non-maskable interrupt\n"); | |
503 | ||
504 | if (reason & MCSR_IF) { | |
505 | printk("Instruction Fetch Error Report\n"); | |
506 | recoverable = 0; | |
507 | } | |
508 | ||
509 | if (reason & MCSR_LD) { | |
510 | printk("Load Error Report\n"); | |
511 | recoverable = 0; | |
512 | } | |
513 | ||
514 | if (reason & MCSR_ST) { | |
515 | printk("Store Error Report\n"); | |
516 | recoverable = 0; | |
517 | } | |
518 | ||
519 | if (reason & MCSR_LDG) { | |
520 | printk("Guarded Load Error Report\n"); | |
521 | recoverable = 0; | |
522 | } | |
523 | ||
524 | if (reason & MCSR_TLBSYNC) | |
525 | printk("Simultaneous tlbsync operations\n"); | |
526 | ||
527 | if (reason & MCSR_BSL2_ERR) { | |
528 | printk("Level 2 Cache Error\n"); | |
529 | recoverable = 0; | |
530 | } | |
531 | ||
532 | if (reason & MCSR_MAV) { | |
533 | u64 addr; | |
534 | ||
535 | addr = mfspr(SPRN_MCAR); | |
536 | addr |= (u64)mfspr(SPRN_MCARU) << 32; | |
537 | ||
538 | printk("Machine Check %s Address: %#llx\n", | |
539 | reason & MCSR_MEA ? "Effective" : "Physical", addr); | |
540 | } | |
541 | ||
cce1f106 | 542 | silent_out: |
fe04b112 SW |
543 | mtspr(SPRN_MCSR, mcsr); |
544 | return mfspr(SPRN_MCSR) == 0 && recoverable; | |
545 | } | |
546 | ||
47c0bd1a BH |
547 | int machine_check_e500(struct pt_regs *regs) |
548 | { | |
549 | unsigned long reason = get_mc_reason(regs); | |
550 | ||
cce1f106 SX |
551 | if (reason & MCSR_BUS_RBERR) { |
552 | if (fsl_rio_mcheck_exception(regs)) | |
553 | return 1; | |
554 | } | |
555 | ||
14cf11af PM |
556 | printk("Machine check in kernel mode.\n"); |
557 | printk("Caused by (from MCSR=%lx): ", reason); | |
558 | ||
559 | if (reason & MCSR_MCP) | |
560 | printk("Machine Check Signal\n"); | |
561 | if (reason & MCSR_ICPERR) | |
562 | printk("Instruction Cache Parity Error\n"); | |
563 | if (reason & MCSR_DCP_PERR) | |
564 | printk("Data Cache Push Parity Error\n"); | |
565 | if (reason & MCSR_DCPERR) | |
566 | printk("Data Cache Parity Error\n"); | |
14cf11af PM |
567 | if (reason & MCSR_BUS_IAERR) |
568 | printk("Bus - Instruction Address Error\n"); | |
569 | if (reason & MCSR_BUS_RAERR) | |
570 | printk("Bus - Read Address Error\n"); | |
571 | if (reason & MCSR_BUS_WAERR) | |
572 | printk("Bus - Write Address Error\n"); | |
573 | if (reason & MCSR_BUS_IBERR) | |
574 | printk("Bus - Instruction Data Error\n"); | |
575 | if (reason & MCSR_BUS_RBERR) | |
576 | printk("Bus - Read Data Bus Error\n"); | |
577 | if (reason & MCSR_BUS_WBERR) | |
578 | printk("Bus - Read Data Bus Error\n"); | |
579 | if (reason & MCSR_BUS_IPERR) | |
580 | printk("Bus - Instruction Parity Error\n"); | |
581 | if (reason & MCSR_BUS_RPERR) | |
582 | printk("Bus - Read Parity Error\n"); | |
47c0bd1a BH |
583 | |
584 | return 0; | |
585 | } | |
4490c06b KG |
586 | |
587 | int machine_check_generic(struct pt_regs *regs) | |
588 | { | |
589 | return 0; | |
590 | } | |
47c0bd1a BH |
591 | #elif defined(CONFIG_E200) |
592 | int machine_check_e200(struct pt_regs *regs) | |
593 | { | |
594 | unsigned long reason = get_mc_reason(regs); | |
595 | ||
14cf11af PM |
596 | printk("Machine check in kernel mode.\n"); |
597 | printk("Caused by (from MCSR=%lx): ", reason); | |
598 | ||
599 | if (reason & MCSR_MCP) | |
600 | printk("Machine Check Signal\n"); | |
601 | if (reason & MCSR_CP_PERR) | |
602 | printk("Cache Push Parity Error\n"); | |
603 | if (reason & MCSR_CPERR) | |
604 | printk("Cache Parity Error\n"); | |
605 | if (reason & MCSR_EXCP_ERR) | |
606 | printk("ISI, ITLB, or Bus Error on first instruction fetch for an exception handler\n"); | |
607 | if (reason & MCSR_BUS_IRERR) | |
608 | printk("Bus - Read Bus Error on instruction fetch\n"); | |
609 | if (reason & MCSR_BUS_DRERR) | |
610 | printk("Bus - Read Bus Error on data load\n"); | |
611 | if (reason & MCSR_BUS_WRERR) | |
612 | printk("Bus - Write Bus Error on buffered store or cache line push\n"); | |
47c0bd1a BH |
613 | |
614 | return 0; | |
615 | } | |
616 | #else | |
617 | int machine_check_generic(struct pt_regs *regs) | |
618 | { | |
619 | unsigned long reason = get_mc_reason(regs); | |
620 | ||
14cf11af PM |
621 | printk("Machine check in kernel mode.\n"); |
622 | printk("Caused by (from SRR1=%lx): ", reason); | |
623 | switch (reason & 0x601F0000) { | |
624 | case 0x80000: | |
625 | printk("Machine check signal\n"); | |
626 | break; | |
627 | case 0: /* for 601 */ | |
628 | case 0x40000: | |
629 | case 0x140000: /* 7450 MSS error and TEA */ | |
630 | printk("Transfer error ack signal\n"); | |
631 | break; | |
632 | case 0x20000: | |
633 | printk("Data parity error signal\n"); | |
634 | break; | |
635 | case 0x10000: | |
636 | printk("Address parity error signal\n"); | |
637 | break; | |
638 | case 0x20000000: | |
639 | printk("L1 Data Cache error\n"); | |
640 | break; | |
641 | case 0x40000000: | |
642 | printk("L1 Instruction Cache error\n"); | |
643 | break; | |
644 | case 0x00100000: | |
645 | printk("L2 data cache parity error\n"); | |
646 | break; | |
647 | default: | |
648 | printk("Unknown values in msr\n"); | |
649 | } | |
75918a4b OJ |
650 | return 0; |
651 | } | |
47c0bd1a | 652 | #endif /* everything else */ |
75918a4b OJ |
653 | |
654 | void machine_check_exception(struct pt_regs *regs) | |
655 | { | |
656 | int recover = 0; | |
657 | ||
89713ed1 AB |
658 | __get_cpu_var(irq_stat).mce_exceptions++; |
659 | ||
47c0bd1a BH |
660 | /* See if any machine dependent calls. In theory, we would want |
661 | * to call the CPU first, and call the ppc_md. one if the CPU | |
662 | * one returns a positive number. However there is existing code | |
663 | * that assumes the board gets a first chance, so let's keep it | |
664 | * that way for now and fix things later. --BenH. | |
665 | */ | |
75918a4b OJ |
666 | if (ppc_md.machine_check_exception) |
667 | recover = ppc_md.machine_check_exception(regs); | |
47c0bd1a BH |
668 | else if (cur_cpu_spec->machine_check) |
669 | recover = cur_cpu_spec->machine_check(regs); | |
75918a4b | 670 | |
47c0bd1a | 671 | if (recover > 0) |
75918a4b OJ |
672 | return; |
673 | ||
75918a4b | 674 | #if defined(CONFIG_8xx) && defined(CONFIG_PCI) |
47c0bd1a BH |
675 | /* the qspan pci read routines can cause machine checks -- Cort |
676 | * | |
677 | * yuck !!! that totally needs to go away ! There are better ways | |
678 | * to deal with that than having a wart in the mcheck handler. | |
679 | * -- BenH | |
680 | */ | |
75918a4b OJ |
681 | bad_page_fault(regs, regs->dar, SIGBUS); |
682 | return; | |
683 | #endif | |
684 | ||
a443506b | 685 | if (debugger_fault_handler(regs)) |
75918a4b | 686 | return; |
75918a4b OJ |
687 | |
688 | if (check_io_access(regs)) | |
689 | return; | |
690 | ||
8dad3f92 | 691 | die("Machine check", regs, SIGBUS); |
14cf11af PM |
692 | |
693 | /* Must die if the interrupt is not recoverable */ | |
694 | if (!(regs->msr & MSR_RI)) | |
695 | panic("Unrecoverable Machine check"); | |
696 | } | |
697 | ||
698 | void SMIException(struct pt_regs *regs) | |
699 | { | |
700 | die("System Management Interrupt", regs, SIGABRT); | |
701 | } | |
702 | ||
dc1c1ca3 | 703 | void unknown_exception(struct pt_regs *regs) |
14cf11af PM |
704 | { |
705 | printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", | |
706 | regs->nip, regs->msr, regs->trap); | |
707 | ||
708 | _exception(SIGTRAP, regs, 0, 0); | |
709 | } | |
710 | ||
dc1c1ca3 | 711 | void instruction_breakpoint_exception(struct pt_regs *regs) |
14cf11af PM |
712 | { |
713 | if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5, | |
714 | 5, SIGTRAP) == NOTIFY_STOP) | |
715 | return; | |
716 | if (debugger_iabr_match(regs)) | |
717 | return; | |
718 | _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); | |
719 | } | |
720 | ||
721 | void RunModeException(struct pt_regs *regs) | |
722 | { | |
723 | _exception(SIGTRAP, regs, 0, 0); | |
724 | } | |
725 | ||
8dad3f92 | 726 | void __kprobes single_step_exception(struct pt_regs *regs) |
14cf11af | 727 | { |
2538c2d0 | 728 | clear_single_step(regs); |
14cf11af PM |
729 | |
730 | if (notify_die(DIE_SSTEP, "single_step", regs, 5, | |
731 | 5, SIGTRAP) == NOTIFY_STOP) | |
732 | return; | |
733 | if (debugger_sstep(regs)) | |
734 | return; | |
735 | ||
736 | _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); | |
737 | } | |
738 | ||
739 | /* | |
740 | * After we have successfully emulated an instruction, we have to | |
741 | * check if the instruction was being single-stepped, and if so, | |
742 | * pretend we got a single-step exception. This was pointed out | |
743 | * by Kumar Gala. -- paulus | |
744 | */ | |
8dad3f92 | 745 | static void emulate_single_step(struct pt_regs *regs) |
14cf11af | 746 | { |
2538c2d0 P |
747 | if (single_stepping(regs)) |
748 | single_step_exception(regs); | |
14cf11af PM |
749 | } |
750 | ||
5fad293b | 751 | static inline int __parse_fpscr(unsigned long fpscr) |
dc1c1ca3 | 752 | { |
5fad293b | 753 | int ret = 0; |
dc1c1ca3 SR |
754 | |
755 | /* Invalid operation */ | |
756 | if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX)) | |
5fad293b | 757 | ret = FPE_FLTINV; |
dc1c1ca3 SR |
758 | |
759 | /* Overflow */ | |
760 | else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX)) | |
5fad293b | 761 | ret = FPE_FLTOVF; |
dc1c1ca3 SR |
762 | |
763 | /* Underflow */ | |
764 | else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX)) | |
5fad293b | 765 | ret = FPE_FLTUND; |
dc1c1ca3 SR |
766 | |
767 | /* Divide by zero */ | |
768 | else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX)) | |
5fad293b | 769 | ret = FPE_FLTDIV; |
dc1c1ca3 SR |
770 | |
771 | /* Inexact result */ | |
772 | else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX)) | |
5fad293b KG |
773 | ret = FPE_FLTRES; |
774 | ||
775 | return ret; | |
776 | } | |
777 | ||
778 | static void parse_fpe(struct pt_regs *regs) | |
779 | { | |
780 | int code = 0; | |
781 | ||
782 | flush_fp_to_thread(current); | |
783 | ||
784 | code = __parse_fpscr(current->thread.fpscr.val); | |
dc1c1ca3 SR |
785 | |
786 | _exception(SIGFPE, regs, code, regs->nip); | |
787 | } | |
788 | ||
789 | /* | |
790 | * Illegal instruction emulation support. Originally written to | |
14cf11af PM |
791 | * provide the PVR to user applications using the mfspr rd, PVR. |
792 | * Return non-zero if we can't emulate, or -EFAULT if the associated | |
793 | * memory access caused an access fault. Return zero on success. | |
794 | * | |
795 | * There are a couple of ways to do this, either "decode" the instruction | |
796 | * or directly match lots of bits. In this case, matching lots of | |
797 | * bits is faster and easier. | |
86417780 | 798 | * |
14cf11af | 799 | */ |
14cf11af PM |
800 | static int emulate_string_inst(struct pt_regs *regs, u32 instword) |
801 | { | |
802 | u8 rT = (instword >> 21) & 0x1f; | |
803 | u8 rA = (instword >> 16) & 0x1f; | |
804 | u8 NB_RB = (instword >> 11) & 0x1f; | |
805 | u32 num_bytes; | |
806 | unsigned long EA; | |
807 | int pos = 0; | |
808 | ||
809 | /* Early out if we are an invalid form of lswx */ | |
16c57b36 | 810 | if ((instword & PPC_INST_STRING_MASK) == PPC_INST_LSWX) |
14cf11af PM |
811 | if ((rT == rA) || (rT == NB_RB)) |
812 | return -EINVAL; | |
813 | ||
814 | EA = (rA == 0) ? 0 : regs->gpr[rA]; | |
815 | ||
16c57b36 KG |
816 | switch (instword & PPC_INST_STRING_MASK) { |
817 | case PPC_INST_LSWX: | |
818 | case PPC_INST_STSWX: | |
14cf11af PM |
819 | EA += NB_RB; |
820 | num_bytes = regs->xer & 0x7f; | |
821 | break; | |
16c57b36 KG |
822 | case PPC_INST_LSWI: |
823 | case PPC_INST_STSWI: | |
14cf11af PM |
824 | num_bytes = (NB_RB == 0) ? 32 : NB_RB; |
825 | break; | |
826 | default: | |
827 | return -EINVAL; | |
828 | } | |
829 | ||
830 | while (num_bytes != 0) | |
831 | { | |
832 | u8 val; | |
833 | u32 shift = 8 * (3 - (pos & 0x3)); | |
834 | ||
16c57b36 KG |
835 | switch ((instword & PPC_INST_STRING_MASK)) { |
836 | case PPC_INST_LSWX: | |
837 | case PPC_INST_LSWI: | |
14cf11af PM |
838 | if (get_user(val, (u8 __user *)EA)) |
839 | return -EFAULT; | |
840 | /* first time updating this reg, | |
841 | * zero it out */ | |
842 | if (pos == 0) | |
843 | regs->gpr[rT] = 0; | |
844 | regs->gpr[rT] |= val << shift; | |
845 | break; | |
16c57b36 KG |
846 | case PPC_INST_STSWI: |
847 | case PPC_INST_STSWX: | |
14cf11af PM |
848 | val = regs->gpr[rT] >> shift; |
849 | if (put_user(val, (u8 __user *)EA)) | |
850 | return -EFAULT; | |
851 | break; | |
852 | } | |
853 | /* move EA to next address */ | |
854 | EA += 1; | |
855 | num_bytes--; | |
856 | ||
857 | /* manage our position within the register */ | |
858 | if (++pos == 4) { | |
859 | pos = 0; | |
860 | if (++rT == 32) | |
861 | rT = 0; | |
862 | } | |
863 | } | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
c3412dcb WS |
868 | static int emulate_popcntb_inst(struct pt_regs *regs, u32 instword) |
869 | { | |
870 | u32 ra,rs; | |
871 | unsigned long tmp; | |
872 | ||
873 | ra = (instword >> 16) & 0x1f; | |
874 | rs = (instword >> 21) & 0x1f; | |
875 | ||
876 | tmp = regs->gpr[rs]; | |
877 | tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL); | |
878 | tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL); | |
879 | tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL; | |
880 | regs->gpr[ra] = tmp; | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
c1469f13 KG |
885 | static int emulate_isel(struct pt_regs *regs, u32 instword) |
886 | { | |
887 | u8 rT = (instword >> 21) & 0x1f; | |
888 | u8 rA = (instword >> 16) & 0x1f; | |
889 | u8 rB = (instword >> 11) & 0x1f; | |
890 | u8 BC = (instword >> 6) & 0x1f; | |
891 | u8 bit; | |
892 | unsigned long tmp; | |
893 | ||
894 | tmp = (rA == 0) ? 0 : regs->gpr[rA]; | |
895 | bit = (regs->ccr >> (31 - BC)) & 0x1; | |
896 | ||
897 | regs->gpr[rT] = bit ? tmp : regs->gpr[rB]; | |
898 | ||
899 | return 0; | |
900 | } | |
901 | ||
14cf11af PM |
902 | static int emulate_instruction(struct pt_regs *regs) |
903 | { | |
904 | u32 instword; | |
905 | u32 rd; | |
906 | ||
fab5db97 | 907 | if (!user_mode(regs) || (regs->msr & MSR_LE)) |
14cf11af PM |
908 | return -EINVAL; |
909 | CHECK_FULL_REGS(regs); | |
910 | ||
911 | if (get_user(instword, (u32 __user *)(regs->nip))) | |
912 | return -EFAULT; | |
913 | ||
914 | /* Emulate the mfspr rD, PVR. */ | |
16c57b36 | 915 | if ((instword & PPC_INST_MFSPR_PVR_MASK) == PPC_INST_MFSPR_PVR) { |
eecff81d | 916 | PPC_WARN_EMULATED(mfpvr, regs); |
14cf11af PM |
917 | rd = (instword >> 21) & 0x1f; |
918 | regs->gpr[rd] = mfspr(SPRN_PVR); | |
919 | return 0; | |
920 | } | |
921 | ||
922 | /* Emulating the dcba insn is just a no-op. */ | |
80947e7c | 923 | if ((instword & PPC_INST_DCBA_MASK) == PPC_INST_DCBA) { |
eecff81d | 924 | PPC_WARN_EMULATED(dcba, regs); |
14cf11af | 925 | return 0; |
80947e7c | 926 | } |
14cf11af PM |
927 | |
928 | /* Emulate the mcrxr insn. */ | |
16c57b36 | 929 | if ((instword & PPC_INST_MCRXR_MASK) == PPC_INST_MCRXR) { |
86417780 | 930 | int shift = (instword >> 21) & 0x1c; |
14cf11af PM |
931 | unsigned long msk = 0xf0000000UL >> shift; |
932 | ||
eecff81d | 933 | PPC_WARN_EMULATED(mcrxr, regs); |
14cf11af PM |
934 | regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk); |
935 | regs->xer &= ~0xf0000000UL; | |
936 | return 0; | |
937 | } | |
938 | ||
939 | /* Emulate load/store string insn. */ | |
80947e7c | 940 | if ((instword & PPC_INST_STRING_GEN_MASK) == PPC_INST_STRING) { |
eecff81d | 941 | PPC_WARN_EMULATED(string, regs); |
14cf11af | 942 | return emulate_string_inst(regs, instword); |
80947e7c | 943 | } |
14cf11af | 944 | |
c3412dcb | 945 | /* Emulate the popcntb (Population Count Bytes) instruction. */ |
16c57b36 | 946 | if ((instword & PPC_INST_POPCNTB_MASK) == PPC_INST_POPCNTB) { |
eecff81d | 947 | PPC_WARN_EMULATED(popcntb, regs); |
c3412dcb WS |
948 | return emulate_popcntb_inst(regs, instword); |
949 | } | |
950 | ||
c1469f13 | 951 | /* Emulate isel (Integer Select) instruction */ |
16c57b36 | 952 | if ((instword & PPC_INST_ISEL_MASK) == PPC_INST_ISEL) { |
eecff81d | 953 | PPC_WARN_EMULATED(isel, regs); |
c1469f13 KG |
954 | return emulate_isel(regs, instword); |
955 | } | |
956 | ||
efcac658 AK |
957 | #ifdef CONFIG_PPC64 |
958 | /* Emulate the mfspr rD, DSCR. */ | |
959 | if (((instword & PPC_INST_MFSPR_DSCR_MASK) == PPC_INST_MFSPR_DSCR) && | |
960 | cpu_has_feature(CPU_FTR_DSCR)) { | |
961 | PPC_WARN_EMULATED(mfdscr, regs); | |
962 | rd = (instword >> 21) & 0x1f; | |
963 | regs->gpr[rd] = mfspr(SPRN_DSCR); | |
964 | return 0; | |
965 | } | |
966 | /* Emulate the mtspr DSCR, rD. */ | |
967 | if (((instword & PPC_INST_MTSPR_DSCR_MASK) == PPC_INST_MTSPR_DSCR) && | |
968 | cpu_has_feature(CPU_FTR_DSCR)) { | |
969 | PPC_WARN_EMULATED(mtdscr, regs); | |
970 | rd = (instword >> 21) & 0x1f; | |
971 | mtspr(SPRN_DSCR, regs->gpr[rd]); | |
972 | current->thread.dscr_inherit = 1; | |
973 | return 0; | |
974 | } | |
975 | #endif | |
976 | ||
14cf11af PM |
977 | return -EINVAL; |
978 | } | |
979 | ||
73c9ceab | 980 | int is_valid_bugaddr(unsigned long addr) |
14cf11af | 981 | { |
73c9ceab | 982 | return is_kernel_addr(addr); |
14cf11af PM |
983 | } |
984 | ||
8dad3f92 | 985 | void __kprobes program_check_exception(struct pt_regs *regs) |
14cf11af PM |
986 | { |
987 | unsigned int reason = get_reason(regs); | |
988 | extern int do_mathemu(struct pt_regs *regs); | |
989 | ||
aa42c69c | 990 | /* We can now get here via a FP Unavailable exception if the core |
04903a30 | 991 | * has no FPU, in that case the reason flags will be 0 */ |
14cf11af | 992 | |
dc1c1ca3 SR |
993 | if (reason & REASON_FP) { |
994 | /* IEEE FP exception */ | |
995 | parse_fpe(regs); | |
8dad3f92 PM |
996 | return; |
997 | } | |
998 | if (reason & REASON_TRAP) { | |
ba797b28 JW |
999 | /* Debugger is first in line to stop recursive faults in |
1000 | * rcu_lock, notify_die, or atomic_notifier_call_chain */ | |
1001 | if (debugger_bpt(regs)) | |
1002 | return; | |
1003 | ||
14cf11af | 1004 | /* trap exception */ |
dc1c1ca3 SR |
1005 | if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP) |
1006 | == NOTIFY_STOP) | |
1007 | return; | |
73c9ceab JF |
1008 | |
1009 | if (!(regs->msr & MSR_PR) && /* not user-mode */ | |
608e2619 | 1010 | report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) { |
14cf11af PM |
1011 | regs->nip += 4; |
1012 | return; | |
1013 | } | |
8dad3f92 PM |
1014 | _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); |
1015 | return; | |
1016 | } | |
1017 | ||
cd8a5673 PM |
1018 | local_irq_enable(); |
1019 | ||
04903a30 KG |
1020 | #ifdef CONFIG_MATH_EMULATION |
1021 | /* (reason & REASON_ILLEGAL) would be the obvious thing here, | |
1022 | * but there seems to be a hardware bug on the 405GP (RevD) | |
1023 | * that means ESR is sometimes set incorrectly - either to | |
1024 | * ESR_DST (!?) or 0. In the process of chasing this with the | |
1025 | * hardware people - not sure if it can happen on any illegal | |
1026 | * instruction or only on FP instructions, whether there is a | |
25985edc | 1027 | * pattern to occurrences etc. -dgibson 31/Mar/2003 */ |
5fad293b KG |
1028 | switch (do_mathemu(regs)) { |
1029 | case 0: | |
04903a30 KG |
1030 | emulate_single_step(regs); |
1031 | return; | |
5fad293b KG |
1032 | case 1: { |
1033 | int code = 0; | |
1034 | code = __parse_fpscr(current->thread.fpscr.val); | |
1035 | _exception(SIGFPE, regs, code, regs->nip); | |
1036 | return; | |
1037 | } | |
1038 | case -EFAULT: | |
1039 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
1040 | return; | |
04903a30 | 1041 | } |
5fad293b | 1042 | /* fall through on any other errors */ |
04903a30 KG |
1043 | #endif /* CONFIG_MATH_EMULATION */ |
1044 | ||
8dad3f92 PM |
1045 | /* Try to emulate it if we should. */ |
1046 | if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) { | |
14cf11af PM |
1047 | switch (emulate_instruction(regs)) { |
1048 | case 0: | |
1049 | regs->nip += 4; | |
1050 | emulate_single_step(regs); | |
8dad3f92 | 1051 | return; |
14cf11af PM |
1052 | case -EFAULT: |
1053 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
8dad3f92 | 1054 | return; |
14cf11af PM |
1055 | } |
1056 | } | |
8dad3f92 PM |
1057 | |
1058 | if (reason & REASON_PRIVILEGED) | |
1059 | _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); | |
1060 | else | |
1061 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
14cf11af PM |
1062 | } |
1063 | ||
dc1c1ca3 | 1064 | void alignment_exception(struct pt_regs *regs) |
14cf11af | 1065 | { |
4393c4f6 | 1066 | int sig, code, fixed = 0; |
14cf11af | 1067 | |
e9370ae1 PM |
1068 | /* we don't implement logging of alignment exceptions */ |
1069 | if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS)) | |
1070 | fixed = fix_alignment(regs); | |
14cf11af PM |
1071 | |
1072 | if (fixed == 1) { | |
1073 | regs->nip += 4; /* skip over emulated instruction */ | |
1074 | emulate_single_step(regs); | |
1075 | return; | |
1076 | } | |
1077 | ||
dc1c1ca3 | 1078 | /* Operand address was bad */ |
14cf11af | 1079 | if (fixed == -EFAULT) { |
4393c4f6 BH |
1080 | sig = SIGSEGV; |
1081 | code = SEGV_ACCERR; | |
1082 | } else { | |
1083 | sig = SIGBUS; | |
1084 | code = BUS_ADRALN; | |
14cf11af | 1085 | } |
4393c4f6 BH |
1086 | if (user_mode(regs)) |
1087 | _exception(sig, regs, code, regs->dar); | |
1088 | else | |
1089 | bad_page_fault(regs, regs->dar, sig); | |
14cf11af PM |
1090 | } |
1091 | ||
1092 | void StackOverflow(struct pt_regs *regs) | |
1093 | { | |
1094 | printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n", | |
1095 | current, regs->gpr[1]); | |
1096 | debugger(regs); | |
1097 | show_regs(regs); | |
1098 | panic("kernel stack overflow"); | |
1099 | } | |
1100 | ||
1101 | void nonrecoverable_exception(struct pt_regs *regs) | |
1102 | { | |
1103 | printk(KERN_ERR "Non-recoverable exception at PC=%lx MSR=%lx\n", | |
1104 | regs->nip, regs->msr); | |
1105 | debugger(regs); | |
1106 | die("nonrecoverable exception", regs, SIGKILL); | |
1107 | } | |
1108 | ||
1109 | void trace_syscall(struct pt_regs *regs) | |
1110 | { | |
1111 | printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n", | |
19c5870c | 1112 | current, task_pid_nr(current), regs->nip, regs->link, regs->gpr[0], |
14cf11af PM |
1113 | regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted()); |
1114 | } | |
dc1c1ca3 | 1115 | |
dc1c1ca3 SR |
1116 | void kernel_fp_unavailable_exception(struct pt_regs *regs) |
1117 | { | |
1118 | printk(KERN_EMERG "Unrecoverable FP Unavailable Exception " | |
1119 | "%lx at %lx\n", regs->trap, regs->nip); | |
1120 | die("Unrecoverable FP Unavailable Exception", regs, SIGABRT); | |
1121 | } | |
dc1c1ca3 SR |
1122 | |
1123 | void altivec_unavailable_exception(struct pt_regs *regs) | |
1124 | { | |
dc1c1ca3 SR |
1125 | if (user_mode(regs)) { |
1126 | /* A user program has executed an altivec instruction, | |
1127 | but this kernel doesn't support altivec. */ | |
1128 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1129 | return; | |
1130 | } | |
6c4841c2 | 1131 | |
dc1c1ca3 SR |
1132 | printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception " |
1133 | "%lx at %lx\n", regs->trap, regs->nip); | |
1134 | die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT); | |
dc1c1ca3 SR |
1135 | } |
1136 | ||
ce48b210 MN |
1137 | void vsx_unavailable_exception(struct pt_regs *regs) |
1138 | { | |
1139 | if (user_mode(regs)) { | |
1140 | /* A user program has executed an vsx instruction, | |
1141 | but this kernel doesn't support vsx. */ | |
1142 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1143 | return; | |
1144 | } | |
1145 | ||
1146 | printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception " | |
1147 | "%lx at %lx\n", regs->trap, regs->nip); | |
1148 | die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT); | |
1149 | } | |
1150 | ||
dc1c1ca3 SR |
1151 | void performance_monitor_exception(struct pt_regs *regs) |
1152 | { | |
89713ed1 AB |
1153 | __get_cpu_var(irq_stat).pmu_irqs++; |
1154 | ||
dc1c1ca3 SR |
1155 | perf_irq(regs); |
1156 | } | |
dc1c1ca3 | 1157 | |
8dad3f92 | 1158 | #ifdef CONFIG_8xx |
14cf11af PM |
1159 | void SoftwareEmulation(struct pt_regs *regs) |
1160 | { | |
1161 | extern int do_mathemu(struct pt_regs *); | |
1162 | extern int Soft_emulate_8xx(struct pt_regs *); | |
5dd57a13 | 1163 | #if defined(CONFIG_MATH_EMULATION) || defined(CONFIG_8XX_MINIMAL_FPEMU) |
14cf11af | 1164 | int errcode; |
5dd57a13 | 1165 | #endif |
14cf11af PM |
1166 | |
1167 | CHECK_FULL_REGS(regs); | |
1168 | ||
1169 | if (!user_mode(regs)) { | |
1170 | debugger(regs); | |
1171 | die("Kernel Mode Software FPU Emulation", regs, SIGFPE); | |
1172 | } | |
1173 | ||
1174 | #ifdef CONFIG_MATH_EMULATION | |
1175 | errcode = do_mathemu(regs); | |
80947e7c | 1176 | if (errcode >= 0) |
eecff81d | 1177 | PPC_WARN_EMULATED(math, regs); |
5fad293b KG |
1178 | |
1179 | switch (errcode) { | |
1180 | case 0: | |
1181 | emulate_single_step(regs); | |
1182 | return; | |
1183 | case 1: { | |
1184 | int code = 0; | |
1185 | code = __parse_fpscr(current->thread.fpscr.val); | |
1186 | _exception(SIGFPE, regs, code, regs->nip); | |
1187 | return; | |
1188 | } | |
1189 | case -EFAULT: | |
1190 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
1191 | return; | |
1192 | default: | |
1193 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1194 | return; | |
1195 | } | |
1196 | ||
5dd57a13 | 1197 | #elif defined(CONFIG_8XX_MINIMAL_FPEMU) |
14cf11af | 1198 | errcode = Soft_emulate_8xx(regs); |
80947e7c | 1199 | if (errcode >= 0) |
eecff81d | 1200 | PPC_WARN_EMULATED(8xx, regs); |
80947e7c | 1201 | |
5fad293b KG |
1202 | switch (errcode) { |
1203 | case 0: | |
14cf11af | 1204 | emulate_single_step(regs); |
5fad293b KG |
1205 | return; |
1206 | case 1: | |
1207 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1208 | return; | |
1209 | case -EFAULT: | |
1210 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
1211 | return; | |
1212 | } | |
5dd57a13 SW |
1213 | #else |
1214 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
5fad293b | 1215 | #endif |
14cf11af | 1216 | } |
8dad3f92 | 1217 | #endif /* CONFIG_8xx */ |
14cf11af | 1218 | |
172ae2e7 | 1219 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
3bffb652 DK |
1220 | static void handle_debug(struct pt_regs *regs, unsigned long debug_status) |
1221 | { | |
1222 | int changed = 0; | |
1223 | /* | |
1224 | * Determine the cause of the debug event, clear the | |
1225 | * event flags and send a trap to the handler. Torez | |
1226 | */ | |
1227 | if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) { | |
1228 | dbcr_dac(current) &= ~(DBCR_DAC1R | DBCR_DAC1W); | |
1229 | #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE | |
1230 | current->thread.dbcr2 &= ~DBCR2_DAC12MODE; | |
1231 | #endif | |
1232 | do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT, | |
1233 | 5); | |
1234 | changed |= 0x01; | |
1235 | } else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) { | |
1236 | dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W); | |
1237 | do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT, | |
1238 | 6); | |
1239 | changed |= 0x01; | |
1240 | } else if (debug_status & DBSR_IAC1) { | |
1241 | current->thread.dbcr0 &= ~DBCR0_IAC1; | |
1242 | dbcr_iac_range(current) &= ~DBCR_IAC12MODE; | |
1243 | do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT, | |
1244 | 1); | |
1245 | changed |= 0x01; | |
1246 | } else if (debug_status & DBSR_IAC2) { | |
1247 | current->thread.dbcr0 &= ~DBCR0_IAC2; | |
1248 | do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT, | |
1249 | 2); | |
1250 | changed |= 0x01; | |
1251 | } else if (debug_status & DBSR_IAC3) { | |
1252 | current->thread.dbcr0 &= ~DBCR0_IAC3; | |
1253 | dbcr_iac_range(current) &= ~DBCR_IAC34MODE; | |
1254 | do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT, | |
1255 | 3); | |
1256 | changed |= 0x01; | |
1257 | } else if (debug_status & DBSR_IAC4) { | |
1258 | current->thread.dbcr0 &= ~DBCR0_IAC4; | |
1259 | do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT, | |
1260 | 4); | |
1261 | changed |= 0x01; | |
1262 | } | |
1263 | /* | |
1264 | * At the point this routine was called, the MSR(DE) was turned off. | |
1265 | * Check all other debug flags and see if that bit needs to be turned | |
1266 | * back on or not. | |
1267 | */ | |
1268 | if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0, current->thread.dbcr1)) | |
1269 | regs->msr |= MSR_DE; | |
1270 | else | |
1271 | /* Make sure the IDM flag is off */ | |
1272 | current->thread.dbcr0 &= ~DBCR0_IDM; | |
1273 | ||
1274 | if (changed & 0x01) | |
1275 | mtspr(SPRN_DBCR0, current->thread.dbcr0); | |
1276 | } | |
14cf11af | 1277 | |
f8279621 | 1278 | void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status) |
14cf11af | 1279 | { |
3bffb652 DK |
1280 | current->thread.dbsr = debug_status; |
1281 | ||
ec097c84 RM |
1282 | /* Hack alert: On BookE, Branch Taken stops on the branch itself, while |
1283 | * on server, it stops on the target of the branch. In order to simulate | |
1284 | * the server behaviour, we thus restart right away with a single step | |
1285 | * instead of stopping here when hitting a BT | |
1286 | */ | |
1287 | if (debug_status & DBSR_BT) { | |
1288 | regs->msr &= ~MSR_DE; | |
1289 | ||
1290 | /* Disable BT */ | |
1291 | mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_BT); | |
1292 | /* Clear the BT event */ | |
1293 | mtspr(SPRN_DBSR, DBSR_BT); | |
1294 | ||
1295 | /* Do the single step trick only when coming from userspace */ | |
1296 | if (user_mode(regs)) { | |
1297 | current->thread.dbcr0 &= ~DBCR0_BT; | |
1298 | current->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC; | |
1299 | regs->msr |= MSR_DE; | |
1300 | return; | |
1301 | } | |
1302 | ||
1303 | if (notify_die(DIE_SSTEP, "block_step", regs, 5, | |
1304 | 5, SIGTRAP) == NOTIFY_STOP) { | |
1305 | return; | |
1306 | } | |
1307 | if (debugger_sstep(regs)) | |
1308 | return; | |
1309 | } else if (debug_status & DBSR_IC) { /* Instruction complete */ | |
14cf11af | 1310 | regs->msr &= ~MSR_DE; |
f8279621 KG |
1311 | |
1312 | /* Disable instruction completion */ | |
1313 | mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC); | |
1314 | /* Clear the instruction completion event */ | |
1315 | mtspr(SPRN_DBSR, DBSR_IC); | |
1316 | ||
1317 | if (notify_die(DIE_SSTEP, "single_step", regs, 5, | |
1318 | 5, SIGTRAP) == NOTIFY_STOP) { | |
1319 | return; | |
1320 | } | |
1321 | ||
1322 | if (debugger_sstep(regs)) | |
1323 | return; | |
1324 | ||
d6a61bfc | 1325 | if (user_mode(regs)) { |
3bffb652 | 1326 | current->thread.dbcr0 &= ~DBCR0_IC; |
3bffb652 DK |
1327 | if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0, |
1328 | current->thread.dbcr1)) | |
1329 | regs->msr |= MSR_DE; | |
1330 | else | |
1331 | /* Make sure the IDM bit is off */ | |
1332 | current->thread.dbcr0 &= ~DBCR0_IDM; | |
d6a61bfc | 1333 | } |
3bffb652 DK |
1334 | |
1335 | _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); | |
1336 | } else | |
1337 | handle_debug(regs, debug_status); | |
14cf11af | 1338 | } |
172ae2e7 | 1339 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
14cf11af PM |
1340 | |
1341 | #if !defined(CONFIG_TAU_INT) | |
1342 | void TAUException(struct pt_regs *regs) | |
1343 | { | |
1344 | printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n", | |
1345 | regs->nip, regs->msr, regs->trap, print_tainted()); | |
1346 | } | |
1347 | #endif /* CONFIG_INT_TAU */ | |
14cf11af PM |
1348 | |
1349 | #ifdef CONFIG_ALTIVEC | |
dc1c1ca3 | 1350 | void altivec_assist_exception(struct pt_regs *regs) |
14cf11af PM |
1351 | { |
1352 | int err; | |
1353 | ||
14cf11af PM |
1354 | if (!user_mode(regs)) { |
1355 | printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode" | |
1356 | " at %lx\n", regs->nip); | |
8dad3f92 | 1357 | die("Kernel VMX/Altivec assist exception", regs, SIGILL); |
14cf11af PM |
1358 | } |
1359 | ||
dc1c1ca3 | 1360 | flush_altivec_to_thread(current); |
dc1c1ca3 | 1361 | |
eecff81d | 1362 | PPC_WARN_EMULATED(altivec, regs); |
14cf11af PM |
1363 | err = emulate_altivec(regs); |
1364 | if (err == 0) { | |
1365 | regs->nip += 4; /* skip emulated instruction */ | |
1366 | emulate_single_step(regs); | |
1367 | return; | |
1368 | } | |
1369 | ||
1370 | if (err == -EFAULT) { | |
1371 | /* got an error reading the instruction */ | |
1372 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1373 | } else { | |
1374 | /* didn't recognize the instruction */ | |
1375 | /* XXX quick hack for now: set the non-Java bit in the VSCR */ | |
76462232 CD |
1376 | printk_ratelimited(KERN_ERR "Unrecognized altivec instruction " |
1377 | "in %s at %lx\n", current->comm, regs->nip); | |
14cf11af PM |
1378 | current->thread.vscr.u[3] |= 0x10000; |
1379 | } | |
1380 | } | |
1381 | #endif /* CONFIG_ALTIVEC */ | |
1382 | ||
ce48b210 MN |
1383 | #ifdef CONFIG_VSX |
1384 | void vsx_assist_exception(struct pt_regs *regs) | |
1385 | { | |
1386 | if (!user_mode(regs)) { | |
1387 | printk(KERN_EMERG "VSX assist exception in kernel mode" | |
1388 | " at %lx\n", regs->nip); | |
1389 | die("Kernel VSX assist exception", regs, SIGILL); | |
1390 | } | |
1391 | ||
1392 | flush_vsx_to_thread(current); | |
1393 | printk(KERN_INFO "VSX assist not supported at %lx\n", regs->nip); | |
1394 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1395 | } | |
1396 | #endif /* CONFIG_VSX */ | |
1397 | ||
14cf11af PM |
1398 | #ifdef CONFIG_FSL_BOOKE |
1399 | void CacheLockingException(struct pt_regs *regs, unsigned long address, | |
1400 | unsigned long error_code) | |
1401 | { | |
1402 | /* We treat cache locking instructions from the user | |
1403 | * as priv ops, in the future we could try to do | |
1404 | * something smarter | |
1405 | */ | |
1406 | if (error_code & (ESR_DLK|ESR_ILK)) | |
1407 | _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); | |
1408 | return; | |
1409 | } | |
1410 | #endif /* CONFIG_FSL_BOOKE */ | |
1411 | ||
1412 | #ifdef CONFIG_SPE | |
1413 | void SPEFloatingPointException(struct pt_regs *regs) | |
1414 | { | |
6a800f36 | 1415 | extern int do_spe_mathemu(struct pt_regs *regs); |
14cf11af PM |
1416 | unsigned long spefscr; |
1417 | int fpexc_mode; | |
1418 | int code = 0; | |
6a800f36 LY |
1419 | int err; |
1420 | ||
685659ee | 1421 | flush_spe_to_thread(current); |
14cf11af PM |
1422 | |
1423 | spefscr = current->thread.spefscr; | |
1424 | fpexc_mode = current->thread.fpexc_mode; | |
1425 | ||
14cf11af PM |
1426 | if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) { |
1427 | code = FPE_FLTOVF; | |
14cf11af PM |
1428 | } |
1429 | else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) { | |
1430 | code = FPE_FLTUND; | |
14cf11af PM |
1431 | } |
1432 | else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV)) | |
1433 | code = FPE_FLTDIV; | |
1434 | else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) { | |
1435 | code = FPE_FLTINV; | |
14cf11af PM |
1436 | } |
1437 | else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES)) | |
1438 | code = FPE_FLTRES; | |
1439 | ||
6a800f36 LY |
1440 | err = do_spe_mathemu(regs); |
1441 | if (err == 0) { | |
1442 | regs->nip += 4; /* skip emulated instruction */ | |
1443 | emulate_single_step(regs); | |
1444 | return; | |
1445 | } | |
1446 | ||
1447 | if (err == -EFAULT) { | |
1448 | /* got an error reading the instruction */ | |
1449 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1450 | } else if (err == -EINVAL) { | |
1451 | /* didn't recognize the instruction */ | |
1452 | printk(KERN_ERR "unrecognized spe instruction " | |
1453 | "in %s at %lx\n", current->comm, regs->nip); | |
1454 | } else { | |
1455 | _exception(SIGFPE, regs, code, regs->nip); | |
1456 | } | |
14cf11af | 1457 | |
14cf11af PM |
1458 | return; |
1459 | } | |
6a800f36 LY |
1460 | |
1461 | void SPEFloatingPointRoundException(struct pt_regs *regs) | |
1462 | { | |
1463 | extern int speround_handler(struct pt_regs *regs); | |
1464 | int err; | |
1465 | ||
1466 | preempt_disable(); | |
1467 | if (regs->msr & MSR_SPE) | |
1468 | giveup_spe(current); | |
1469 | preempt_enable(); | |
1470 | ||
1471 | regs->nip -= 4; | |
1472 | err = speround_handler(regs); | |
1473 | if (err == 0) { | |
1474 | regs->nip += 4; /* skip emulated instruction */ | |
1475 | emulate_single_step(regs); | |
1476 | return; | |
1477 | } | |
1478 | ||
1479 | if (err == -EFAULT) { | |
1480 | /* got an error reading the instruction */ | |
1481 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1482 | } else if (err == -EINVAL) { | |
1483 | /* didn't recognize the instruction */ | |
1484 | printk(KERN_ERR "unrecognized spe instruction " | |
1485 | "in %s at %lx\n", current->comm, regs->nip); | |
1486 | } else { | |
1487 | _exception(SIGFPE, regs, 0, regs->nip); | |
1488 | return; | |
1489 | } | |
1490 | } | |
14cf11af PM |
1491 | #endif |
1492 | ||
dc1c1ca3 SR |
1493 | /* |
1494 | * We enter here if we get an unrecoverable exception, that is, one | |
1495 | * that happened at a point where the RI (recoverable interrupt) bit | |
1496 | * in the MSR is 0. This indicates that SRR0/1 are live, and that | |
1497 | * we therefore lost state by taking this exception. | |
1498 | */ | |
1499 | void unrecoverable_exception(struct pt_regs *regs) | |
1500 | { | |
1501 | printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n", | |
1502 | regs->trap, regs->nip); | |
1503 | die("Unrecoverable exception", regs, SIGABRT); | |
1504 | } | |
dc1c1ca3 | 1505 | |
14cf11af PM |
1506 | #ifdef CONFIG_BOOKE_WDT |
1507 | /* | |
1508 | * Default handler for a Watchdog exception, | |
1509 | * spins until a reboot occurs | |
1510 | */ | |
1511 | void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs) | |
1512 | { | |
1513 | /* Generic WatchdogHandler, implement your own */ | |
1514 | mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE)); | |
1515 | return; | |
1516 | } | |
1517 | ||
1518 | void WatchdogException(struct pt_regs *regs) | |
1519 | { | |
1520 | printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n"); | |
1521 | WatchdogHandler(regs); | |
1522 | } | |
1523 | #endif | |
dc1c1ca3 | 1524 | |
dc1c1ca3 SR |
1525 | /* |
1526 | * We enter here if we discover during exception entry that we are | |
1527 | * running in supervisor mode with a userspace value in the stack pointer. | |
1528 | */ | |
1529 | void kernel_bad_stack(struct pt_regs *regs) | |
1530 | { | |
1531 | printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n", | |
1532 | regs->gpr[1], regs->nip); | |
1533 | die("Bad kernel stack pointer", regs, SIGABRT); | |
1534 | } | |
14cf11af PM |
1535 | |
1536 | void __init trap_init(void) | |
1537 | { | |
1538 | } | |
80947e7c GU |
1539 | |
1540 | ||
1541 | #ifdef CONFIG_PPC_EMULATED_STATS | |
1542 | ||
1543 | #define WARN_EMULATED_SETUP(type) .type = { .name = #type } | |
1544 | ||
1545 | struct ppc_emulated ppc_emulated = { | |
1546 | #ifdef CONFIG_ALTIVEC | |
1547 | WARN_EMULATED_SETUP(altivec), | |
1548 | #endif | |
1549 | WARN_EMULATED_SETUP(dcba), | |
1550 | WARN_EMULATED_SETUP(dcbz), | |
1551 | WARN_EMULATED_SETUP(fp_pair), | |
1552 | WARN_EMULATED_SETUP(isel), | |
1553 | WARN_EMULATED_SETUP(mcrxr), | |
1554 | WARN_EMULATED_SETUP(mfpvr), | |
1555 | WARN_EMULATED_SETUP(multiple), | |
1556 | WARN_EMULATED_SETUP(popcntb), | |
1557 | WARN_EMULATED_SETUP(spe), | |
1558 | WARN_EMULATED_SETUP(string), | |
1559 | WARN_EMULATED_SETUP(unaligned), | |
1560 | #ifdef CONFIG_MATH_EMULATION | |
1561 | WARN_EMULATED_SETUP(math), | |
1562 | #elif defined(CONFIG_8XX_MINIMAL_FPEMU) | |
1563 | WARN_EMULATED_SETUP(8xx), | |
1564 | #endif | |
1565 | #ifdef CONFIG_VSX | |
1566 | WARN_EMULATED_SETUP(vsx), | |
1567 | #endif | |
efcac658 AK |
1568 | #ifdef CONFIG_PPC64 |
1569 | WARN_EMULATED_SETUP(mfdscr), | |
1570 | WARN_EMULATED_SETUP(mtdscr), | |
1571 | #endif | |
80947e7c GU |
1572 | }; |
1573 | ||
1574 | u32 ppc_warn_emulated; | |
1575 | ||
1576 | void ppc_warn_emulated_print(const char *type) | |
1577 | { | |
76462232 CD |
1578 | pr_warn_ratelimited("%s used emulated %s instruction\n", current->comm, |
1579 | type); | |
80947e7c GU |
1580 | } |
1581 | ||
1582 | static int __init ppc_warn_emulated_init(void) | |
1583 | { | |
1584 | struct dentry *dir, *d; | |
1585 | unsigned int i; | |
1586 | struct ppc_emulated_entry *entries = (void *)&ppc_emulated; | |
1587 | ||
1588 | if (!powerpc_debugfs_root) | |
1589 | return -ENODEV; | |
1590 | ||
1591 | dir = debugfs_create_dir("emulated_instructions", | |
1592 | powerpc_debugfs_root); | |
1593 | if (!dir) | |
1594 | return -ENOMEM; | |
1595 | ||
1596 | d = debugfs_create_u32("do_warn", S_IRUGO | S_IWUSR, dir, | |
1597 | &ppc_warn_emulated); | |
1598 | if (!d) | |
1599 | goto fail; | |
1600 | ||
1601 | for (i = 0; i < sizeof(ppc_emulated)/sizeof(*entries); i++) { | |
1602 | d = debugfs_create_u32(entries[i].name, S_IRUGO | S_IWUSR, dir, | |
1603 | (u32 *)&entries[i].val.counter); | |
1604 | if (!d) | |
1605 | goto fail; | |
1606 | } | |
1607 | ||
1608 | return 0; | |
1609 | ||
1610 | fail: | |
1611 | debugfs_remove_recursive(dir); | |
1612 | return -ENOMEM; | |
1613 | } | |
1614 | ||
1615 | device_initcall(ppc_warn_emulated_init); | |
1616 | ||
1617 | #endif /* CONFIG_PPC_EMULATED_STATS */ |