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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 | 27 | #include <linux/init.h> |
8a39b05f PG |
28 | #include <linux/extable.h> |
29 | #include <linux/module.h> /* print_modules */ | |
8dad3f92 | 30 | #include <linux/prctl.h> |
14cf11af PM |
31 | #include <linux/delay.h> |
32 | #include <linux/kprobes.h> | |
cc532915 | 33 | #include <linux/kexec.h> |
5474c120 | 34 | #include <linux/backlight.h> |
73c9ceab | 35 | #include <linux/bug.h> |
1eeb66a1 | 36 | #include <linux/kdebug.h> |
80947e7c | 37 | #include <linux/debugfs.h> |
76462232 | 38 | #include <linux/ratelimit.h> |
ba12eede | 39 | #include <linux/context_tracking.h> |
14cf11af | 40 | |
80947e7c | 41 | #include <asm/emulated_ops.h> |
14cf11af | 42 | #include <asm/pgtable.h> |
7c0f6ba6 | 43 | #include <linux/uaccess.h> |
14cf11af | 44 | #include <asm/io.h> |
86417780 PM |
45 | #include <asm/machdep.h> |
46 | #include <asm/rtas.h> | |
f7f6f4fe | 47 | #include <asm/pmc.h> |
14cf11af | 48 | #include <asm/reg.h> |
14cf11af PM |
49 | #ifdef CONFIG_PMAC_BACKLIGHT |
50 | #include <asm/backlight.h> | |
51 | #endif | |
dc1c1ca3 | 52 | #ifdef CONFIG_PPC64 |
86417780 | 53 | #include <asm/firmware.h> |
dc1c1ca3 | 54 | #include <asm/processor.h> |
6ce6c629 | 55 | #include <asm/tm.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> |
ae3a197e | 61 | #include <asm/switch_to.h> |
f54db641 | 62 | #include <asm/tm.h> |
ae3a197e | 63 | #include <asm/debug.h> |
42f5b4ca | 64 | #include <asm/asm-prototypes.h> |
fd7bacbc | 65 | #include <asm/hmi.h> |
4e0e3435 | 66 | #include <sysdev/fsl_pci.h> |
6cc89bad | 67 | #include <asm/kprobes.h> |
dc1c1ca3 | 68 | |
da665885 | 69 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC_CORE) |
5be3492f AB |
70 | int (*__debugger)(struct pt_regs *regs) __read_mostly; |
71 | int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly; | |
72 | int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly; | |
73 | int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly; | |
74 | int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly; | |
9422de3e | 75 | int (*__debugger_break_match)(struct pt_regs *regs) __read_mostly; |
5be3492f | 76 | int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly; |
14cf11af PM |
77 | |
78 | EXPORT_SYMBOL(__debugger); | |
79 | EXPORT_SYMBOL(__debugger_ipi); | |
80 | EXPORT_SYMBOL(__debugger_bpt); | |
81 | EXPORT_SYMBOL(__debugger_sstep); | |
82 | EXPORT_SYMBOL(__debugger_iabr_match); | |
9422de3e | 83 | EXPORT_SYMBOL(__debugger_break_match); |
14cf11af PM |
84 | EXPORT_SYMBOL(__debugger_fault_handler); |
85 | #endif | |
86 | ||
8b3c34cf MN |
87 | /* Transactional Memory trap debug */ |
88 | #ifdef TM_DEBUG_SW | |
89 | #define TM_DEBUG(x...) printk(KERN_INFO x) | |
90 | #else | |
91 | #define TM_DEBUG(x...) do { } while(0) | |
92 | #endif | |
93 | ||
14cf11af PM |
94 | /* |
95 | * Trap & Exception support | |
96 | */ | |
97 | ||
6031d9d9 | 98 | #ifdef CONFIG_PMAC_BACKLIGHT |
99 | static void pmac_backlight_unblank(void) | |
100 | { | |
101 | mutex_lock(&pmac_backlight_mutex); | |
102 | if (pmac_backlight) { | |
103 | struct backlight_properties *props; | |
104 | ||
105 | props = &pmac_backlight->props; | |
106 | props->brightness = props->max_brightness; | |
107 | props->power = FB_BLANK_UNBLANK; | |
108 | backlight_update_status(pmac_backlight); | |
109 | } | |
110 | mutex_unlock(&pmac_backlight_mutex); | |
111 | } | |
112 | #else | |
113 | static inline void pmac_backlight_unblank(void) { } | |
114 | #endif | |
115 | ||
760ca4dc AB |
116 | static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
117 | static int die_owner = -1; | |
118 | static unsigned int die_nest_count; | |
119 | static int die_counter; | |
120 | ||
03465f89 | 121 | static unsigned long oops_begin(struct pt_regs *regs) |
14cf11af | 122 | { |
760ca4dc | 123 | int cpu; |
34c2a14f | 124 | unsigned long flags; |
14cf11af | 125 | |
293e4688 | 126 | oops_enter(); |
127 | ||
760ca4dc AB |
128 | /* racy, but better than risking deadlock. */ |
129 | raw_local_irq_save(flags); | |
130 | cpu = smp_processor_id(); | |
131 | if (!arch_spin_trylock(&die_lock)) { | |
132 | if (cpu == die_owner) | |
133 | /* nested oops. should stop eventually */; | |
134 | else | |
135 | arch_spin_lock(&die_lock); | |
34c2a14f | 136 | } |
760ca4dc AB |
137 | die_nest_count++; |
138 | die_owner = cpu; | |
139 | console_verbose(); | |
140 | bust_spinlocks(1); | |
141 | if (machine_is(powermac)) | |
142 | pmac_backlight_unblank(); | |
143 | return flags; | |
144 | } | |
03465f89 | 145 | NOKPROBE_SYMBOL(oops_begin); |
e8222502 | 146 | |
03465f89 | 147 | static void oops_end(unsigned long flags, struct pt_regs *regs, |
760ca4dc AB |
148 | int signr) |
149 | { | |
14cf11af | 150 | bust_spinlocks(0); |
373d4d09 | 151 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
760ca4dc | 152 | die_nest_count--; |
58154c8c AB |
153 | oops_exit(); |
154 | printk("\n"); | |
7458e8b2 | 155 | if (!die_nest_count) { |
760ca4dc | 156 | /* Nest count reaches zero, release the lock. */ |
7458e8b2 | 157 | die_owner = -1; |
760ca4dc | 158 | arch_spin_unlock(&die_lock); |
7458e8b2 | 159 | } |
760ca4dc | 160 | raw_local_irq_restore(flags); |
cc532915 | 161 | |
ebaeb5ae MS |
162 | crash_fadump(regs, "die oops"); |
163 | ||
9b00ac06 AB |
164 | /* |
165 | * A system reset (0x100) is a request to dump, so we always send | |
166 | * it through the crashdump code. | |
167 | */ | |
168 | if (kexec_should_crash(current) || (TRAP(regs) == 0x100)) { | |
cc532915 | 169 | crash_kexec(regs); |
9b00ac06 AB |
170 | |
171 | /* | |
172 | * We aren't the primary crash CPU. We need to send it | |
173 | * to a holding pattern to avoid it ending up in the panic | |
174 | * code. | |
175 | */ | |
176 | crash_kexec_secondary(regs); | |
177 | } | |
14cf11af | 178 | |
760ca4dc AB |
179 | if (!signr) |
180 | return; | |
181 | ||
58154c8c AB |
182 | /* |
183 | * While our oops output is serialised by a spinlock, output | |
184 | * from panic() called below can race and corrupt it. If we | |
185 | * know we are going to panic, delay for 1 second so we have a | |
186 | * chance to get clean backtraces from all CPUs that are oopsing. | |
187 | */ | |
188 | if (in_interrupt() || panic_on_oops || !current->pid || | |
189 | is_global_init(current)) { | |
190 | mdelay(MSEC_PER_SEC); | |
191 | } | |
192 | ||
14cf11af PM |
193 | if (in_interrupt()) |
194 | panic("Fatal exception in interrupt"); | |
cea6a4ba | 195 | if (panic_on_oops) |
012c437d | 196 | panic("Fatal exception"); |
760ca4dc AB |
197 | do_exit(signr); |
198 | } | |
03465f89 | 199 | NOKPROBE_SYMBOL(oops_end); |
cea6a4ba | 200 | |
03465f89 | 201 | static int __die(const char *str, struct pt_regs *regs, long err) |
760ca4dc AB |
202 | { |
203 | printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter); | |
204 | #ifdef CONFIG_PREEMPT | |
205 | printk("PREEMPT "); | |
206 | #endif | |
207 | #ifdef CONFIG_SMP | |
208 | printk("SMP NR_CPUS=%d ", NR_CPUS); | |
209 | #endif | |
e7df0d88 JK |
210 | if (debug_pagealloc_enabled()) |
211 | printk("DEBUG_PAGEALLOC "); | |
760ca4dc AB |
212 | #ifdef CONFIG_NUMA |
213 | printk("NUMA "); | |
214 | #endif | |
215 | printk("%s\n", ppc_md.name ? ppc_md.name : ""); | |
216 | ||
217 | if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV) == NOTIFY_STOP) | |
218 | return 1; | |
219 | ||
220 | print_modules(); | |
221 | show_regs(regs); | |
14cf11af PM |
222 | |
223 | return 0; | |
224 | } | |
03465f89 | 225 | NOKPROBE_SYMBOL(__die); |
14cf11af | 226 | |
760ca4dc AB |
227 | void die(const char *str, struct pt_regs *regs, long err) |
228 | { | |
6f44b20e NP |
229 | unsigned long flags; |
230 | ||
231 | if (debugger(regs)) | |
232 | return; | |
760ca4dc | 233 | |
6f44b20e | 234 | flags = oops_begin(regs); |
760ca4dc AB |
235 | if (__die(str, regs, err)) |
236 | err = 0; | |
237 | oops_end(flags, regs, err); | |
238 | } | |
239 | ||
25baa35b ON |
240 | void user_single_step_siginfo(struct task_struct *tsk, |
241 | struct pt_regs *regs, siginfo_t *info) | |
242 | { | |
243 | memset(info, 0, sizeof(*info)); | |
244 | info->si_signo = SIGTRAP; | |
245 | info->si_code = TRAP_TRACE; | |
246 | info->si_addr = (void __user *)regs->nip; | |
247 | } | |
248 | ||
14cf11af PM |
249 | void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) |
250 | { | |
251 | siginfo_t info; | |
d0c3d534 OJ |
252 | const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \ |
253 | "at %08lx nip %08lx lr %08lx code %x\n"; | |
254 | const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \ | |
255 | "at %016lx nip %016lx lr %016lx code %x\n"; | |
14cf11af PM |
256 | |
257 | if (!user_mode(regs)) { | |
760ca4dc AB |
258 | die("Exception in kernel mode", regs, signr); |
259 | return; | |
260 | } | |
261 | ||
262 | if (show_unhandled_signals && unhandled_signal(current, signr)) { | |
76462232 CD |
263 | printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32, |
264 | current->comm, current->pid, signr, | |
265 | addr, regs->nip, regs->link, code); | |
266 | } | |
14cf11af | 267 | |
a3512b2d | 268 | if (arch_irqs_disabled() && !arch_irq_disabled_regs(regs)) |
9f2f79e3 BH |
269 | local_irq_enable(); |
270 | ||
41ab5266 | 271 | current->thread.trap_nr = code; |
14cf11af PM |
272 | memset(&info, 0, sizeof(info)); |
273 | info.si_signo = signr; | |
274 | info.si_code = code; | |
275 | info.si_addr = (void __user *) addr; | |
276 | force_sig_info(signr, &info, current); | |
14cf11af PM |
277 | } |
278 | ||
14cf11af PM |
279 | void system_reset_exception(struct pt_regs *regs) |
280 | { | |
281 | /* See if any machine dependent calls */ | |
c902be71 AB |
282 | if (ppc_md.system_reset_exception) { |
283 | if (ppc_md.system_reset_exception(regs)) | |
284 | return; | |
285 | } | |
14cf11af | 286 | |
8dad3f92 | 287 | die("System Reset", regs, SIGABRT); |
14cf11af PM |
288 | |
289 | /* Must die if the interrupt is not recoverable */ | |
290 | if (!(regs->msr & MSR_RI)) | |
291 | panic("Unrecoverable System Reset"); | |
292 | ||
293 | /* What should we do here? We could issue a shutdown or hard reset. */ | |
294 | } | |
1e9b4507 | 295 | |
f307939f | 296 | #ifdef CONFIG_PPC64 |
1e9b4507 MS |
297 | /* |
298 | * This function is called in real mode. Strictly no printk's please. | |
299 | * | |
300 | * regs->nip and regs->msr contains srr0 and ssr1. | |
301 | */ | |
302 | long machine_check_early(struct pt_regs *regs) | |
303 | { | |
4c703416 MS |
304 | long handled = 0; |
305 | ||
69111bac | 306 | __this_cpu_inc(irq_stat.mce_exceptions); |
e6654d5b | 307 | |
27ea2c42 DA |
308 | add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); |
309 | ||
4c703416 MS |
310 | if (cur_cpu_spec && cur_cpu_spec->machine_check_early) |
311 | handled = cur_cpu_spec->machine_check_early(regs); | |
312 | return handled; | |
1e9b4507 MS |
313 | } |
314 | ||
0869b6fd MS |
315 | long hmi_exception_realmode(struct pt_regs *regs) |
316 | { | |
69111bac | 317 | __this_cpu_inc(irq_stat.hmi_exceptions); |
0869b6fd | 318 | |
fd7bacbc MS |
319 | wait_for_subcore_guest_exit(); |
320 | ||
0869b6fd MS |
321 | if (ppc_md.hmi_exception_early) |
322 | ppc_md.hmi_exception_early(regs); | |
323 | ||
fd7bacbc MS |
324 | wait_for_tb_resync(); |
325 | ||
0869b6fd MS |
326 | return 0; |
327 | } | |
328 | ||
14cf11af PM |
329 | #endif |
330 | ||
331 | /* | |
332 | * I/O accesses can cause machine checks on powermacs. | |
333 | * Check if the NIP corresponds to the address of a sync | |
334 | * instruction for which there is an entry in the exception | |
335 | * table. | |
336 | * Note that the 601 only takes a machine check on TEA | |
337 | * (transfer error ack) signal assertion, and does not | |
338 | * set any of the top 16 bits of SRR1. | |
339 | * -- paulus. | |
340 | */ | |
341 | static inline int check_io_access(struct pt_regs *regs) | |
342 | { | |
68a64357 | 343 | #ifdef CONFIG_PPC32 |
14cf11af PM |
344 | unsigned long msr = regs->msr; |
345 | const struct exception_table_entry *entry; | |
346 | unsigned int *nip = (unsigned int *)regs->nip; | |
347 | ||
348 | if (((msr & 0xffff0000) == 0 || (msr & (0x80000 | 0x40000))) | |
349 | && (entry = search_exception_tables(regs->nip)) != NULL) { | |
350 | /* | |
351 | * Check that it's a sync instruction, or somewhere | |
352 | * in the twi; isync; nop sequence that inb/inw/inl uses. | |
353 | * As the address is in the exception table | |
354 | * we should be able to read the instr there. | |
355 | * For the debug message, we look at the preceding | |
356 | * load or store. | |
357 | */ | |
ddc6cd0d | 358 | if (*nip == PPC_INST_NOP) |
14cf11af | 359 | nip -= 2; |
ddc6cd0d | 360 | else if (*nip == PPC_INST_ISYNC) |
14cf11af | 361 | --nip; |
ddc6cd0d | 362 | if (*nip == PPC_INST_SYNC || (*nip >> 26) == OP_TRAP) { |
14cf11af PM |
363 | unsigned int rb; |
364 | ||
365 | --nip; | |
366 | rb = (*nip >> 11) & 0x1f; | |
367 | printk(KERN_DEBUG "%s bad port %lx at %p\n", | |
368 | (*nip & 0x100)? "OUT to": "IN from", | |
369 | regs->gpr[rb] - _IO_BASE, nip); | |
370 | regs->msr |= MSR_RI; | |
61a92f70 | 371 | regs->nip = extable_fixup(entry); |
14cf11af PM |
372 | return 1; |
373 | } | |
374 | } | |
68a64357 | 375 | #endif /* CONFIG_PPC32 */ |
14cf11af PM |
376 | return 0; |
377 | } | |
378 | ||
172ae2e7 | 379 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
14cf11af PM |
380 | /* On 4xx, the reason for the machine check or program exception |
381 | is in the ESR. */ | |
382 | #define get_reason(regs) ((regs)->dsisr) | |
383 | #ifndef CONFIG_FSL_BOOKE | |
384 | #define get_mc_reason(regs) ((regs)->dsisr) | |
385 | #else | |
fe04b112 | 386 | #define get_mc_reason(regs) (mfspr(SPRN_MCSR)) |
14cf11af PM |
387 | #endif |
388 | #define REASON_FP ESR_FP | |
389 | #define REASON_ILLEGAL (ESR_PIL | ESR_PUO) | |
390 | #define REASON_PRIVILEGED ESR_PPR | |
391 | #define REASON_TRAP ESR_PTR | |
392 | ||
393 | /* single-step stuff */ | |
51ae8d4a BB |
394 | #define single_stepping(regs) (current->thread.debug.dbcr0 & DBCR0_IC) |
395 | #define clear_single_step(regs) (current->thread.debug.dbcr0 &= ~DBCR0_IC) | |
14cf11af PM |
396 | |
397 | #else | |
398 | /* On non-4xx, the reason for the machine check or program | |
399 | exception is in the MSR. */ | |
400 | #define get_reason(regs) ((regs)->msr) | |
401 | #define get_mc_reason(regs) ((regs)->msr) | |
8b3c34cf | 402 | #define REASON_TM 0x200000 |
14cf11af PM |
403 | #define REASON_FP 0x100000 |
404 | #define REASON_ILLEGAL 0x80000 | |
405 | #define REASON_PRIVILEGED 0x40000 | |
406 | #define REASON_TRAP 0x20000 | |
407 | ||
408 | #define single_stepping(regs) ((regs)->msr & MSR_SE) | |
409 | #define clear_single_step(regs) ((regs)->msr &= ~MSR_SE) | |
410 | #endif | |
411 | ||
47c0bd1a BH |
412 | #if defined(CONFIG_4xx) |
413 | int machine_check_4xx(struct pt_regs *regs) | |
14cf11af | 414 | { |
1a6a4ffe | 415 | unsigned long reason = get_mc_reason(regs); |
14cf11af | 416 | |
14cf11af PM |
417 | if (reason & ESR_IMCP) { |
418 | printk("Instruction"); | |
419 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
420 | } else | |
421 | printk("Data"); | |
422 | printk(" machine check in kernel mode.\n"); | |
47c0bd1a BH |
423 | |
424 | return 0; | |
425 | } | |
426 | ||
427 | int machine_check_440A(struct pt_regs *regs) | |
428 | { | |
429 | unsigned long reason = get_mc_reason(regs); | |
430 | ||
14cf11af PM |
431 | printk("Machine check in kernel mode.\n"); |
432 | if (reason & ESR_IMCP){ | |
433 | printk("Instruction Synchronous Machine Check exception\n"); | |
434 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
435 | } | |
436 | else { | |
437 | u32 mcsr = mfspr(SPRN_MCSR); | |
438 | if (mcsr & MCSR_IB) | |
439 | printk("Instruction Read PLB Error\n"); | |
440 | if (mcsr & MCSR_DRB) | |
441 | printk("Data Read PLB Error\n"); | |
442 | if (mcsr & MCSR_DWB) | |
443 | printk("Data Write PLB Error\n"); | |
444 | if (mcsr & MCSR_TLBP) | |
445 | printk("TLB Parity Error\n"); | |
446 | if (mcsr & MCSR_ICP){ | |
447 | flush_instruction_cache(); | |
448 | printk("I-Cache Parity Error\n"); | |
449 | } | |
450 | if (mcsr & MCSR_DCSP) | |
451 | printk("D-Cache Search Parity Error\n"); | |
452 | if (mcsr & MCSR_DCFP) | |
453 | printk("D-Cache Flush Parity Error\n"); | |
454 | if (mcsr & MCSR_IMPE) | |
455 | printk("Machine Check exception is imprecise\n"); | |
456 | ||
457 | /* Clear MCSR */ | |
458 | mtspr(SPRN_MCSR, mcsr); | |
459 | } | |
47c0bd1a BH |
460 | return 0; |
461 | } | |
fc5e7097 DK |
462 | |
463 | int machine_check_47x(struct pt_regs *regs) | |
464 | { | |
465 | unsigned long reason = get_mc_reason(regs); | |
466 | u32 mcsr; | |
467 | ||
468 | printk(KERN_ERR "Machine check in kernel mode.\n"); | |
469 | if (reason & ESR_IMCP) { | |
470 | printk(KERN_ERR | |
471 | "Instruction Synchronous Machine Check exception\n"); | |
472 | mtspr(SPRN_ESR, reason & ~ESR_IMCP); | |
473 | return 0; | |
474 | } | |
475 | mcsr = mfspr(SPRN_MCSR); | |
476 | if (mcsr & MCSR_IB) | |
477 | printk(KERN_ERR "Instruction Read PLB Error\n"); | |
478 | if (mcsr & MCSR_DRB) | |
479 | printk(KERN_ERR "Data Read PLB Error\n"); | |
480 | if (mcsr & MCSR_DWB) | |
481 | printk(KERN_ERR "Data Write PLB Error\n"); | |
482 | if (mcsr & MCSR_TLBP) | |
483 | printk(KERN_ERR "TLB Parity Error\n"); | |
484 | if (mcsr & MCSR_ICP) { | |
485 | flush_instruction_cache(); | |
486 | printk(KERN_ERR "I-Cache Parity Error\n"); | |
487 | } | |
488 | if (mcsr & MCSR_DCSP) | |
489 | printk(KERN_ERR "D-Cache Search Parity Error\n"); | |
490 | if (mcsr & PPC47x_MCSR_GPR) | |
491 | printk(KERN_ERR "GPR Parity Error\n"); | |
492 | if (mcsr & PPC47x_MCSR_FPR) | |
493 | printk(KERN_ERR "FPR Parity Error\n"); | |
494 | if (mcsr & PPC47x_MCSR_IPR) | |
495 | printk(KERN_ERR "Machine Check exception is imprecise\n"); | |
496 | ||
497 | /* Clear MCSR */ | |
498 | mtspr(SPRN_MCSR, mcsr); | |
499 | ||
500 | return 0; | |
501 | } | |
47c0bd1a | 502 | #elif defined(CONFIG_E500) |
fe04b112 SW |
503 | int machine_check_e500mc(struct pt_regs *regs) |
504 | { | |
505 | unsigned long mcsr = mfspr(SPRN_MCSR); | |
506 | unsigned long reason = mcsr; | |
507 | int recoverable = 1; | |
508 | ||
82a9a480 | 509 | if (reason & MCSR_LD) { |
cce1f106 SX |
510 | recoverable = fsl_rio_mcheck_exception(regs); |
511 | if (recoverable == 1) | |
512 | goto silent_out; | |
513 | } | |
514 | ||
fe04b112 SW |
515 | printk("Machine check in kernel mode.\n"); |
516 | printk("Caused by (from MCSR=%lx): ", reason); | |
517 | ||
518 | if (reason & MCSR_MCP) | |
519 | printk("Machine Check Signal\n"); | |
520 | ||
521 | if (reason & MCSR_ICPERR) { | |
522 | printk("Instruction Cache Parity Error\n"); | |
523 | ||
524 | /* | |
525 | * This is recoverable by invalidating the i-cache. | |
526 | */ | |
527 | mtspr(SPRN_L1CSR1, mfspr(SPRN_L1CSR1) | L1CSR1_ICFI); | |
528 | while (mfspr(SPRN_L1CSR1) & L1CSR1_ICFI) | |
529 | ; | |
530 | ||
531 | /* | |
532 | * This will generally be accompanied by an instruction | |
533 | * fetch error report -- only treat MCSR_IF as fatal | |
534 | * if it wasn't due to an L1 parity error. | |
535 | */ | |
536 | reason &= ~MCSR_IF; | |
537 | } | |
538 | ||
539 | if (reason & MCSR_DCPERR_MC) { | |
540 | printk("Data Cache Parity Error\n"); | |
37caf9f2 KG |
541 | |
542 | /* | |
543 | * In write shadow mode we auto-recover from the error, but it | |
544 | * may still get logged and cause a machine check. We should | |
545 | * only treat the non-write shadow case as non-recoverable. | |
546 | */ | |
547 | if (!(mfspr(SPRN_L1CSR2) & L1CSR2_DCWS)) | |
548 | recoverable = 0; | |
fe04b112 SW |
549 | } |
550 | ||
551 | if (reason & MCSR_L2MMU_MHIT) { | |
552 | printk("Hit on multiple TLB entries\n"); | |
553 | recoverable = 0; | |
554 | } | |
555 | ||
556 | if (reason & MCSR_NMI) | |
557 | printk("Non-maskable interrupt\n"); | |
558 | ||
559 | if (reason & MCSR_IF) { | |
560 | printk("Instruction Fetch Error Report\n"); | |
561 | recoverable = 0; | |
562 | } | |
563 | ||
564 | if (reason & MCSR_LD) { | |
565 | printk("Load Error Report\n"); | |
566 | recoverable = 0; | |
567 | } | |
568 | ||
569 | if (reason & MCSR_ST) { | |
570 | printk("Store Error Report\n"); | |
571 | recoverable = 0; | |
572 | } | |
573 | ||
574 | if (reason & MCSR_LDG) { | |
575 | printk("Guarded Load Error Report\n"); | |
576 | recoverable = 0; | |
577 | } | |
578 | ||
579 | if (reason & MCSR_TLBSYNC) | |
580 | printk("Simultaneous tlbsync operations\n"); | |
581 | ||
582 | if (reason & MCSR_BSL2_ERR) { | |
583 | printk("Level 2 Cache Error\n"); | |
584 | recoverable = 0; | |
585 | } | |
586 | ||
587 | if (reason & MCSR_MAV) { | |
588 | u64 addr; | |
589 | ||
590 | addr = mfspr(SPRN_MCAR); | |
591 | addr |= (u64)mfspr(SPRN_MCARU) << 32; | |
592 | ||
593 | printk("Machine Check %s Address: %#llx\n", | |
594 | reason & MCSR_MEA ? "Effective" : "Physical", addr); | |
595 | } | |
596 | ||
cce1f106 | 597 | silent_out: |
fe04b112 SW |
598 | mtspr(SPRN_MCSR, mcsr); |
599 | return mfspr(SPRN_MCSR) == 0 && recoverable; | |
600 | } | |
601 | ||
47c0bd1a BH |
602 | int machine_check_e500(struct pt_regs *regs) |
603 | { | |
604 | unsigned long reason = get_mc_reason(regs); | |
605 | ||
cce1f106 SX |
606 | if (reason & MCSR_BUS_RBERR) { |
607 | if (fsl_rio_mcheck_exception(regs)) | |
608 | return 1; | |
4e0e3435 HJ |
609 | if (fsl_pci_mcheck_exception(regs)) |
610 | return 1; | |
cce1f106 SX |
611 | } |
612 | ||
14cf11af PM |
613 | printk("Machine check in kernel mode.\n"); |
614 | printk("Caused by (from MCSR=%lx): ", reason); | |
615 | ||
616 | if (reason & MCSR_MCP) | |
617 | printk("Machine Check Signal\n"); | |
618 | if (reason & MCSR_ICPERR) | |
619 | printk("Instruction Cache Parity Error\n"); | |
620 | if (reason & MCSR_DCP_PERR) | |
621 | printk("Data Cache Push Parity Error\n"); | |
622 | if (reason & MCSR_DCPERR) | |
623 | printk("Data Cache Parity Error\n"); | |
14cf11af PM |
624 | if (reason & MCSR_BUS_IAERR) |
625 | printk("Bus - Instruction Address Error\n"); | |
626 | if (reason & MCSR_BUS_RAERR) | |
627 | printk("Bus - Read Address Error\n"); | |
628 | if (reason & MCSR_BUS_WAERR) | |
629 | printk("Bus - Write Address Error\n"); | |
630 | if (reason & MCSR_BUS_IBERR) | |
631 | printk("Bus - Instruction Data Error\n"); | |
632 | if (reason & MCSR_BUS_RBERR) | |
633 | printk("Bus - Read Data Bus Error\n"); | |
634 | if (reason & MCSR_BUS_WBERR) | |
c1528339 | 635 | printk("Bus - Write Data Bus Error\n"); |
14cf11af PM |
636 | if (reason & MCSR_BUS_IPERR) |
637 | printk("Bus - Instruction Parity Error\n"); | |
638 | if (reason & MCSR_BUS_RPERR) | |
639 | printk("Bus - Read Parity Error\n"); | |
47c0bd1a BH |
640 | |
641 | return 0; | |
642 | } | |
4490c06b KG |
643 | |
644 | int machine_check_generic(struct pt_regs *regs) | |
645 | { | |
646 | return 0; | |
647 | } | |
47c0bd1a BH |
648 | #elif defined(CONFIG_E200) |
649 | int machine_check_e200(struct pt_regs *regs) | |
650 | { | |
651 | unsigned long reason = get_mc_reason(regs); | |
652 | ||
14cf11af PM |
653 | printk("Machine check in kernel mode.\n"); |
654 | printk("Caused by (from MCSR=%lx): ", reason); | |
655 | ||
656 | if (reason & MCSR_MCP) | |
657 | printk("Machine Check Signal\n"); | |
658 | if (reason & MCSR_CP_PERR) | |
659 | printk("Cache Push Parity Error\n"); | |
660 | if (reason & MCSR_CPERR) | |
661 | printk("Cache Parity Error\n"); | |
662 | if (reason & MCSR_EXCP_ERR) | |
663 | printk("ISI, ITLB, or Bus Error on first instruction fetch for an exception handler\n"); | |
664 | if (reason & MCSR_BUS_IRERR) | |
665 | printk("Bus - Read Bus Error on instruction fetch\n"); | |
666 | if (reason & MCSR_BUS_DRERR) | |
667 | printk("Bus - Read Bus Error on data load\n"); | |
668 | if (reason & MCSR_BUS_WRERR) | |
669 | printk("Bus - Write Bus Error on buffered store or cache line push\n"); | |
47c0bd1a BH |
670 | |
671 | return 0; | |
672 | } | |
e627f8dc CL |
673 | #elif defined(CONFIG_PPC_8xx) |
674 | int machine_check_8xx(struct pt_regs *regs) | |
675 | { | |
676 | unsigned long reason = get_mc_reason(regs); | |
677 | ||
678 | pr_err("Machine check in kernel mode.\n"); | |
679 | pr_err("Caused by (from SRR1=%lx): ", reason); | |
680 | if (reason & 0x40000000) | |
681 | pr_err("Fetch error at address %lx\n", regs->nip); | |
682 | else | |
683 | pr_err("Data access error at address %lx\n", regs->dar); | |
684 | ||
685 | #ifdef CONFIG_PCI | |
686 | /* the qspan pci read routines can cause machine checks -- Cort | |
687 | * | |
688 | * yuck !!! that totally needs to go away ! There are better ways | |
689 | * to deal with that than having a wart in the mcheck handler. | |
690 | * -- BenH | |
691 | */ | |
692 | bad_page_fault(regs, regs->dar, SIGBUS); | |
693 | return 1; | |
694 | #else | |
695 | return 0; | |
696 | #endif | |
697 | } | |
47c0bd1a BH |
698 | #else |
699 | int machine_check_generic(struct pt_regs *regs) | |
700 | { | |
701 | unsigned long reason = get_mc_reason(regs); | |
702 | ||
14cf11af PM |
703 | printk("Machine check in kernel mode.\n"); |
704 | printk("Caused by (from SRR1=%lx): ", reason); | |
705 | switch (reason & 0x601F0000) { | |
706 | case 0x80000: | |
707 | printk("Machine check signal\n"); | |
708 | break; | |
709 | case 0: /* for 601 */ | |
710 | case 0x40000: | |
711 | case 0x140000: /* 7450 MSS error and TEA */ | |
712 | printk("Transfer error ack signal\n"); | |
713 | break; | |
714 | case 0x20000: | |
715 | printk("Data parity error signal\n"); | |
716 | break; | |
717 | case 0x10000: | |
718 | printk("Address parity error signal\n"); | |
719 | break; | |
720 | case 0x20000000: | |
721 | printk("L1 Data Cache error\n"); | |
722 | break; | |
723 | case 0x40000000: | |
724 | printk("L1 Instruction Cache error\n"); | |
725 | break; | |
726 | case 0x00100000: | |
727 | printk("L2 data cache parity error\n"); | |
728 | break; | |
729 | default: | |
730 | printk("Unknown values in msr\n"); | |
731 | } | |
75918a4b OJ |
732 | return 0; |
733 | } | |
47c0bd1a | 734 | #endif /* everything else */ |
75918a4b OJ |
735 | |
736 | void machine_check_exception(struct pt_regs *regs) | |
737 | { | |
ba12eede | 738 | enum ctx_state prev_state = exception_enter(); |
75918a4b OJ |
739 | int recover = 0; |
740 | ||
69111bac | 741 | __this_cpu_inc(irq_stat.mce_exceptions); |
89713ed1 | 742 | |
47c0bd1a BH |
743 | /* See if any machine dependent calls. In theory, we would want |
744 | * to call the CPU first, and call the ppc_md. one if the CPU | |
745 | * one returns a positive number. However there is existing code | |
746 | * that assumes the board gets a first chance, so let's keep it | |
747 | * that way for now and fix things later. --BenH. | |
748 | */ | |
75918a4b OJ |
749 | if (ppc_md.machine_check_exception) |
750 | recover = ppc_md.machine_check_exception(regs); | |
47c0bd1a BH |
751 | else if (cur_cpu_spec->machine_check) |
752 | recover = cur_cpu_spec->machine_check(regs); | |
75918a4b | 753 | |
47c0bd1a | 754 | if (recover > 0) |
ba12eede | 755 | goto bail; |
75918a4b | 756 | |
a443506b | 757 | if (debugger_fault_handler(regs)) |
ba12eede | 758 | goto bail; |
75918a4b OJ |
759 | |
760 | if (check_io_access(regs)) | |
ba12eede | 761 | goto bail; |
75918a4b | 762 | |
8dad3f92 | 763 | die("Machine check", regs, SIGBUS); |
14cf11af PM |
764 | |
765 | /* Must die if the interrupt is not recoverable */ | |
766 | if (!(regs->msr & MSR_RI)) | |
767 | panic("Unrecoverable Machine check"); | |
ba12eede LZ |
768 | |
769 | bail: | |
770 | exception_exit(prev_state); | |
14cf11af PM |
771 | } |
772 | ||
773 | void SMIException(struct pt_regs *regs) | |
774 | { | |
775 | die("System Management Interrupt", regs, SIGABRT); | |
776 | } | |
777 | ||
0869b6fd MS |
778 | void handle_hmi_exception(struct pt_regs *regs) |
779 | { | |
780 | struct pt_regs *old_regs; | |
781 | ||
782 | old_regs = set_irq_regs(regs); | |
783 | irq_enter(); | |
784 | ||
785 | if (ppc_md.handle_hmi_exception) | |
786 | ppc_md.handle_hmi_exception(regs); | |
787 | ||
788 | irq_exit(); | |
789 | set_irq_regs(old_regs); | |
790 | } | |
791 | ||
dc1c1ca3 | 792 | void unknown_exception(struct pt_regs *regs) |
14cf11af | 793 | { |
ba12eede LZ |
794 | enum ctx_state prev_state = exception_enter(); |
795 | ||
14cf11af PM |
796 | printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", |
797 | regs->nip, regs->msr, regs->trap); | |
798 | ||
799 | _exception(SIGTRAP, regs, 0, 0); | |
ba12eede LZ |
800 | |
801 | exception_exit(prev_state); | |
14cf11af PM |
802 | } |
803 | ||
dc1c1ca3 | 804 | void instruction_breakpoint_exception(struct pt_regs *regs) |
14cf11af | 805 | { |
ba12eede LZ |
806 | enum ctx_state prev_state = exception_enter(); |
807 | ||
14cf11af PM |
808 | if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5, |
809 | 5, SIGTRAP) == NOTIFY_STOP) | |
ba12eede | 810 | goto bail; |
14cf11af | 811 | if (debugger_iabr_match(regs)) |
ba12eede | 812 | goto bail; |
14cf11af | 813 | _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); |
ba12eede LZ |
814 | |
815 | bail: | |
816 | exception_exit(prev_state); | |
14cf11af PM |
817 | } |
818 | ||
819 | void RunModeException(struct pt_regs *regs) | |
820 | { | |
821 | _exception(SIGTRAP, regs, 0, 0); | |
822 | } | |
823 | ||
03465f89 | 824 | void single_step_exception(struct pt_regs *regs) |
14cf11af | 825 | { |
ba12eede LZ |
826 | enum ctx_state prev_state = exception_enter(); |
827 | ||
2538c2d0 | 828 | clear_single_step(regs); |
14cf11af | 829 | |
6cc89bad NR |
830 | if (kprobe_post_handler(regs)) |
831 | return; | |
832 | ||
14cf11af PM |
833 | if (notify_die(DIE_SSTEP, "single_step", regs, 5, |
834 | 5, SIGTRAP) == NOTIFY_STOP) | |
ba12eede | 835 | goto bail; |
14cf11af | 836 | if (debugger_sstep(regs)) |
ba12eede | 837 | goto bail; |
14cf11af PM |
838 | |
839 | _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); | |
ba12eede LZ |
840 | |
841 | bail: | |
842 | exception_exit(prev_state); | |
14cf11af | 843 | } |
03465f89 | 844 | NOKPROBE_SYMBOL(single_step_exception); |
14cf11af PM |
845 | |
846 | /* | |
847 | * After we have successfully emulated an instruction, we have to | |
848 | * check if the instruction was being single-stepped, and if so, | |
849 | * pretend we got a single-step exception. This was pointed out | |
850 | * by Kumar Gala. -- paulus | |
851 | */ | |
8dad3f92 | 852 | static void emulate_single_step(struct pt_regs *regs) |
14cf11af | 853 | { |
2538c2d0 P |
854 | if (single_stepping(regs)) |
855 | single_step_exception(regs); | |
14cf11af PM |
856 | } |
857 | ||
5fad293b | 858 | static inline int __parse_fpscr(unsigned long fpscr) |
dc1c1ca3 | 859 | { |
5fad293b | 860 | int ret = 0; |
dc1c1ca3 SR |
861 | |
862 | /* Invalid operation */ | |
863 | if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX)) | |
5fad293b | 864 | ret = FPE_FLTINV; |
dc1c1ca3 SR |
865 | |
866 | /* Overflow */ | |
867 | else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX)) | |
5fad293b | 868 | ret = FPE_FLTOVF; |
dc1c1ca3 SR |
869 | |
870 | /* Underflow */ | |
871 | else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX)) | |
5fad293b | 872 | ret = FPE_FLTUND; |
dc1c1ca3 SR |
873 | |
874 | /* Divide by zero */ | |
875 | else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX)) | |
5fad293b | 876 | ret = FPE_FLTDIV; |
dc1c1ca3 SR |
877 | |
878 | /* Inexact result */ | |
879 | else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX)) | |
5fad293b KG |
880 | ret = FPE_FLTRES; |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
885 | static void parse_fpe(struct pt_regs *regs) | |
886 | { | |
887 | int code = 0; | |
888 | ||
889 | flush_fp_to_thread(current); | |
890 | ||
de79f7b9 | 891 | code = __parse_fpscr(current->thread.fp_state.fpscr); |
dc1c1ca3 SR |
892 | |
893 | _exception(SIGFPE, regs, code, regs->nip); | |
894 | } | |
895 | ||
896 | /* | |
897 | * Illegal instruction emulation support. Originally written to | |
14cf11af PM |
898 | * provide the PVR to user applications using the mfspr rd, PVR. |
899 | * Return non-zero if we can't emulate, or -EFAULT if the associated | |
900 | * memory access caused an access fault. Return zero on success. | |
901 | * | |
902 | * There are a couple of ways to do this, either "decode" the instruction | |
903 | * or directly match lots of bits. In this case, matching lots of | |
904 | * bits is faster and easier. | |
86417780 | 905 | * |
14cf11af | 906 | */ |
14cf11af PM |
907 | static int emulate_string_inst(struct pt_regs *regs, u32 instword) |
908 | { | |
909 | u8 rT = (instword >> 21) & 0x1f; | |
910 | u8 rA = (instword >> 16) & 0x1f; | |
911 | u8 NB_RB = (instword >> 11) & 0x1f; | |
912 | u32 num_bytes; | |
913 | unsigned long EA; | |
914 | int pos = 0; | |
915 | ||
916 | /* Early out if we are an invalid form of lswx */ | |
16c57b36 | 917 | if ((instword & PPC_INST_STRING_MASK) == PPC_INST_LSWX) |
14cf11af PM |
918 | if ((rT == rA) || (rT == NB_RB)) |
919 | return -EINVAL; | |
920 | ||
921 | EA = (rA == 0) ? 0 : regs->gpr[rA]; | |
922 | ||
16c57b36 KG |
923 | switch (instword & PPC_INST_STRING_MASK) { |
924 | case PPC_INST_LSWX: | |
925 | case PPC_INST_STSWX: | |
14cf11af PM |
926 | EA += NB_RB; |
927 | num_bytes = regs->xer & 0x7f; | |
928 | break; | |
16c57b36 KG |
929 | case PPC_INST_LSWI: |
930 | case PPC_INST_STSWI: | |
14cf11af PM |
931 | num_bytes = (NB_RB == 0) ? 32 : NB_RB; |
932 | break; | |
933 | default: | |
934 | return -EINVAL; | |
935 | } | |
936 | ||
937 | while (num_bytes != 0) | |
938 | { | |
939 | u8 val; | |
940 | u32 shift = 8 * (3 - (pos & 0x3)); | |
941 | ||
80aa0fb4 JY |
942 | /* if process is 32-bit, clear upper 32 bits of EA */ |
943 | if ((regs->msr & MSR_64BIT) == 0) | |
944 | EA &= 0xFFFFFFFF; | |
945 | ||
16c57b36 KG |
946 | switch ((instword & PPC_INST_STRING_MASK)) { |
947 | case PPC_INST_LSWX: | |
948 | case PPC_INST_LSWI: | |
14cf11af PM |
949 | if (get_user(val, (u8 __user *)EA)) |
950 | return -EFAULT; | |
951 | /* first time updating this reg, | |
952 | * zero it out */ | |
953 | if (pos == 0) | |
954 | regs->gpr[rT] = 0; | |
955 | regs->gpr[rT] |= val << shift; | |
956 | break; | |
16c57b36 KG |
957 | case PPC_INST_STSWI: |
958 | case PPC_INST_STSWX: | |
14cf11af PM |
959 | val = regs->gpr[rT] >> shift; |
960 | if (put_user(val, (u8 __user *)EA)) | |
961 | return -EFAULT; | |
962 | break; | |
963 | } | |
964 | /* move EA to next address */ | |
965 | EA += 1; | |
966 | num_bytes--; | |
967 | ||
968 | /* manage our position within the register */ | |
969 | if (++pos == 4) { | |
970 | pos = 0; | |
971 | if (++rT == 32) | |
972 | rT = 0; | |
973 | } | |
974 | } | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
c3412dcb WS |
979 | static int emulate_popcntb_inst(struct pt_regs *regs, u32 instword) |
980 | { | |
981 | u32 ra,rs; | |
982 | unsigned long tmp; | |
983 | ||
984 | ra = (instword >> 16) & 0x1f; | |
985 | rs = (instword >> 21) & 0x1f; | |
986 | ||
987 | tmp = regs->gpr[rs]; | |
988 | tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL); | |
989 | tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL); | |
990 | tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL; | |
991 | regs->gpr[ra] = tmp; | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
c1469f13 KG |
996 | static int emulate_isel(struct pt_regs *regs, u32 instword) |
997 | { | |
998 | u8 rT = (instword >> 21) & 0x1f; | |
999 | u8 rA = (instword >> 16) & 0x1f; | |
1000 | u8 rB = (instword >> 11) & 0x1f; | |
1001 | u8 BC = (instword >> 6) & 0x1f; | |
1002 | u8 bit; | |
1003 | unsigned long tmp; | |
1004 | ||
1005 | tmp = (rA == 0) ? 0 : regs->gpr[rA]; | |
1006 | bit = (regs->ccr >> (31 - BC)) & 0x1; | |
1007 | ||
1008 | regs->gpr[rT] = bit ? tmp : regs->gpr[rB]; | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | ||
6ce6c629 MN |
1013 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1014 | static inline bool tm_abort_check(struct pt_regs *regs, int cause) | |
1015 | { | |
1016 | /* If we're emulating a load/store in an active transaction, we cannot | |
1017 | * emulate it as the kernel operates in transaction suspended context. | |
1018 | * We need to abort the transaction. This creates a persistent TM | |
1019 | * abort so tell the user what caused it with a new code. | |
1020 | */ | |
1021 | if (MSR_TM_TRANSACTIONAL(regs->msr)) { | |
1022 | tm_enable(); | |
1023 | tm_abort(cause); | |
1024 | return true; | |
1025 | } | |
1026 | return false; | |
1027 | } | |
1028 | #else | |
1029 | static inline bool tm_abort_check(struct pt_regs *regs, int reason) | |
1030 | { | |
1031 | return false; | |
1032 | } | |
1033 | #endif | |
1034 | ||
14cf11af PM |
1035 | static int emulate_instruction(struct pt_regs *regs) |
1036 | { | |
1037 | u32 instword; | |
1038 | u32 rd; | |
1039 | ||
4288e343 | 1040 | if (!user_mode(regs)) |
14cf11af PM |
1041 | return -EINVAL; |
1042 | CHECK_FULL_REGS(regs); | |
1043 | ||
1044 | if (get_user(instword, (u32 __user *)(regs->nip))) | |
1045 | return -EFAULT; | |
1046 | ||
1047 | /* Emulate the mfspr rD, PVR. */ | |
16c57b36 | 1048 | if ((instword & PPC_INST_MFSPR_PVR_MASK) == PPC_INST_MFSPR_PVR) { |
eecff81d | 1049 | PPC_WARN_EMULATED(mfpvr, regs); |
14cf11af PM |
1050 | rd = (instword >> 21) & 0x1f; |
1051 | regs->gpr[rd] = mfspr(SPRN_PVR); | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* Emulating the dcba insn is just a no-op. */ | |
80947e7c | 1056 | if ((instword & PPC_INST_DCBA_MASK) == PPC_INST_DCBA) { |
eecff81d | 1057 | PPC_WARN_EMULATED(dcba, regs); |
14cf11af | 1058 | return 0; |
80947e7c | 1059 | } |
14cf11af PM |
1060 | |
1061 | /* Emulate the mcrxr insn. */ | |
16c57b36 | 1062 | if ((instword & PPC_INST_MCRXR_MASK) == PPC_INST_MCRXR) { |
86417780 | 1063 | int shift = (instword >> 21) & 0x1c; |
14cf11af PM |
1064 | unsigned long msk = 0xf0000000UL >> shift; |
1065 | ||
eecff81d | 1066 | PPC_WARN_EMULATED(mcrxr, regs); |
14cf11af PM |
1067 | regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk); |
1068 | regs->xer &= ~0xf0000000UL; | |
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | /* Emulate load/store string insn. */ | |
80947e7c | 1073 | if ((instword & PPC_INST_STRING_GEN_MASK) == PPC_INST_STRING) { |
6ce6c629 MN |
1074 | if (tm_abort_check(regs, |
1075 | TM_CAUSE_EMULATE | TM_CAUSE_PERSISTENT)) | |
1076 | return -EINVAL; | |
eecff81d | 1077 | PPC_WARN_EMULATED(string, regs); |
14cf11af | 1078 | return emulate_string_inst(regs, instword); |
80947e7c | 1079 | } |
14cf11af | 1080 | |
c3412dcb | 1081 | /* Emulate the popcntb (Population Count Bytes) instruction. */ |
16c57b36 | 1082 | if ((instword & PPC_INST_POPCNTB_MASK) == PPC_INST_POPCNTB) { |
eecff81d | 1083 | PPC_WARN_EMULATED(popcntb, regs); |
c3412dcb WS |
1084 | return emulate_popcntb_inst(regs, instword); |
1085 | } | |
1086 | ||
c1469f13 | 1087 | /* Emulate isel (Integer Select) instruction */ |
16c57b36 | 1088 | if ((instword & PPC_INST_ISEL_MASK) == PPC_INST_ISEL) { |
eecff81d | 1089 | PPC_WARN_EMULATED(isel, regs); |
c1469f13 KG |
1090 | return emulate_isel(regs, instword); |
1091 | } | |
1092 | ||
9863c28a JY |
1093 | /* Emulate sync instruction variants */ |
1094 | if ((instword & PPC_INST_SYNC_MASK) == PPC_INST_SYNC) { | |
1095 | PPC_WARN_EMULATED(sync, regs); | |
1096 | asm volatile("sync"); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
efcac658 AK |
1100 | #ifdef CONFIG_PPC64 |
1101 | /* Emulate the mfspr rD, DSCR. */ | |
73d2fb75 AB |
1102 | if ((((instword & PPC_INST_MFSPR_DSCR_USER_MASK) == |
1103 | PPC_INST_MFSPR_DSCR_USER) || | |
1104 | ((instword & PPC_INST_MFSPR_DSCR_MASK) == | |
1105 | PPC_INST_MFSPR_DSCR)) && | |
efcac658 AK |
1106 | cpu_has_feature(CPU_FTR_DSCR)) { |
1107 | PPC_WARN_EMULATED(mfdscr, regs); | |
1108 | rd = (instword >> 21) & 0x1f; | |
1109 | regs->gpr[rd] = mfspr(SPRN_DSCR); | |
1110 | return 0; | |
1111 | } | |
1112 | /* Emulate the mtspr DSCR, rD. */ | |
73d2fb75 AB |
1113 | if ((((instword & PPC_INST_MTSPR_DSCR_USER_MASK) == |
1114 | PPC_INST_MTSPR_DSCR_USER) || | |
1115 | ((instword & PPC_INST_MTSPR_DSCR_MASK) == | |
1116 | PPC_INST_MTSPR_DSCR)) && | |
efcac658 AK |
1117 | cpu_has_feature(CPU_FTR_DSCR)) { |
1118 | PPC_WARN_EMULATED(mtdscr, regs); | |
1119 | rd = (instword >> 21) & 0x1f; | |
00ca0de0 | 1120 | current->thread.dscr = regs->gpr[rd]; |
efcac658 | 1121 | current->thread.dscr_inherit = 1; |
00ca0de0 | 1122 | mtspr(SPRN_DSCR, current->thread.dscr); |
efcac658 AK |
1123 | return 0; |
1124 | } | |
1125 | #endif | |
1126 | ||
14cf11af PM |
1127 | return -EINVAL; |
1128 | } | |
1129 | ||
73c9ceab | 1130 | int is_valid_bugaddr(unsigned long addr) |
14cf11af | 1131 | { |
73c9ceab | 1132 | return is_kernel_addr(addr); |
14cf11af PM |
1133 | } |
1134 | ||
3a3b5aa6 KH |
1135 | #ifdef CONFIG_MATH_EMULATION |
1136 | static int emulate_math(struct pt_regs *regs) | |
1137 | { | |
1138 | int ret; | |
1139 | extern int do_mathemu(struct pt_regs *regs); | |
1140 | ||
1141 | ret = do_mathemu(regs); | |
1142 | if (ret >= 0) | |
1143 | PPC_WARN_EMULATED(math, regs); | |
1144 | ||
1145 | switch (ret) { | |
1146 | case 0: | |
1147 | emulate_single_step(regs); | |
1148 | return 0; | |
1149 | case 1: { | |
1150 | int code = 0; | |
de79f7b9 | 1151 | code = __parse_fpscr(current->thread.fp_state.fpscr); |
3a3b5aa6 KH |
1152 | _exception(SIGFPE, regs, code, regs->nip); |
1153 | return 0; | |
1154 | } | |
1155 | case -EFAULT: | |
1156 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | return -1; | |
1161 | } | |
1162 | #else | |
1163 | static inline int emulate_math(struct pt_regs *regs) { return -1; } | |
1164 | #endif | |
1165 | ||
03465f89 | 1166 | void program_check_exception(struct pt_regs *regs) |
14cf11af | 1167 | { |
ba12eede | 1168 | enum ctx_state prev_state = exception_enter(); |
14cf11af | 1169 | unsigned int reason = get_reason(regs); |
14cf11af | 1170 | |
aa42c69c | 1171 | /* We can now get here via a FP Unavailable exception if the core |
04903a30 | 1172 | * has no FPU, in that case the reason flags will be 0 */ |
14cf11af | 1173 | |
dc1c1ca3 SR |
1174 | if (reason & REASON_FP) { |
1175 | /* IEEE FP exception */ | |
1176 | parse_fpe(regs); | |
ba12eede | 1177 | goto bail; |
8dad3f92 PM |
1178 | } |
1179 | if (reason & REASON_TRAP) { | |
a4c3f909 | 1180 | unsigned long bugaddr; |
ba797b28 JW |
1181 | /* Debugger is first in line to stop recursive faults in |
1182 | * rcu_lock, notify_die, or atomic_notifier_call_chain */ | |
1183 | if (debugger_bpt(regs)) | |
ba12eede | 1184 | goto bail; |
ba797b28 | 1185 | |
6cc89bad NR |
1186 | if (kprobe_handler(regs)) |
1187 | goto bail; | |
1188 | ||
14cf11af | 1189 | /* trap exception */ |
dc1c1ca3 SR |
1190 | if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP) |
1191 | == NOTIFY_STOP) | |
ba12eede | 1192 | goto bail; |
73c9ceab | 1193 | |
a4c3f909 BS |
1194 | bugaddr = regs->nip; |
1195 | /* | |
1196 | * Fixup bugaddr for BUG_ON() in real mode | |
1197 | */ | |
1198 | if (!is_kernel_addr(bugaddr) && !(regs->msr & MSR_IR)) | |
1199 | bugaddr += PAGE_OFFSET; | |
1200 | ||
73c9ceab | 1201 | if (!(regs->msr & MSR_PR) && /* not user-mode */ |
a4c3f909 | 1202 | report_bug(bugaddr, regs) == BUG_TRAP_TYPE_WARN) { |
14cf11af | 1203 | regs->nip += 4; |
ba12eede | 1204 | goto bail; |
14cf11af | 1205 | } |
8dad3f92 | 1206 | _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip); |
ba12eede | 1207 | goto bail; |
8dad3f92 | 1208 | } |
bc2a9408 MN |
1209 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1210 | if (reason & REASON_TM) { | |
1211 | /* This is a TM "Bad Thing Exception" program check. | |
1212 | * This occurs when: | |
1213 | * - An rfid/hrfid/mtmsrd attempts to cause an illegal | |
1214 | * transition in TM states. | |
1215 | * - A trechkpt is attempted when transactional. | |
1216 | * - A treclaim is attempted when non transactional. | |
1217 | * - A tend is illegally attempted. | |
1218 | * - writing a TM SPR when transactional. | |
1219 | */ | |
1220 | if (!user_mode(regs) && | |
1221 | report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) { | |
1222 | regs->nip += 4; | |
ba12eede | 1223 | goto bail; |
bc2a9408 MN |
1224 | } |
1225 | /* If usermode caused this, it's done something illegal and | |
1226 | * gets a SIGILL slap on the wrist. We call it an illegal | |
1227 | * operand to distinguish from the instruction just being bad | |
1228 | * (e.g. executing a 'tend' on a CPU without TM!); it's an | |
1229 | * illegal /placement/ of a valid instruction. | |
1230 | */ | |
1231 | if (user_mode(regs)) { | |
1232 | _exception(SIGILL, regs, ILL_ILLOPN, regs->nip); | |
ba12eede | 1233 | goto bail; |
bc2a9408 MN |
1234 | } else { |
1235 | printk(KERN_EMERG "Unexpected TM Bad Thing exception " | |
1236 | "at %lx (msr 0x%x)\n", regs->nip, reason); | |
1237 | die("Unrecoverable exception", regs, SIGABRT); | |
1238 | } | |
1239 | } | |
1240 | #endif | |
8dad3f92 | 1241 | |
b3f6a459 ME |
1242 | /* |
1243 | * If we took the program check in the kernel skip down to sending a | |
1244 | * SIGILL. The subsequent cases all relate to emulating instructions | |
1245 | * which we should only do for userspace. We also do not want to enable | |
1246 | * interrupts for kernel faults because that might lead to further | |
1247 | * faults, and loose the context of the original exception. | |
1248 | */ | |
1249 | if (!user_mode(regs)) | |
1250 | goto sigill; | |
1251 | ||
a3512b2d BH |
1252 | /* We restore the interrupt state now */ |
1253 | if (!arch_irq_disabled_regs(regs)) | |
1254 | local_irq_enable(); | |
cd8a5673 | 1255 | |
04903a30 KG |
1256 | /* (reason & REASON_ILLEGAL) would be the obvious thing here, |
1257 | * but there seems to be a hardware bug on the 405GP (RevD) | |
1258 | * that means ESR is sometimes set incorrectly - either to | |
1259 | * ESR_DST (!?) or 0. In the process of chasing this with the | |
1260 | * hardware people - not sure if it can happen on any illegal | |
1261 | * instruction or only on FP instructions, whether there is a | |
4e63f8ed BH |
1262 | * pattern to occurrences etc. -dgibson 31/Mar/2003 |
1263 | */ | |
3a3b5aa6 | 1264 | if (!emulate_math(regs)) |
ba12eede | 1265 | goto bail; |
04903a30 | 1266 | |
8dad3f92 PM |
1267 | /* Try to emulate it if we should. */ |
1268 | if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) { | |
14cf11af PM |
1269 | switch (emulate_instruction(regs)) { |
1270 | case 0: | |
1271 | regs->nip += 4; | |
1272 | emulate_single_step(regs); | |
ba12eede | 1273 | goto bail; |
14cf11af PM |
1274 | case -EFAULT: |
1275 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip); | |
ba12eede | 1276 | goto bail; |
14cf11af PM |
1277 | } |
1278 | } | |
8dad3f92 | 1279 | |
b3f6a459 | 1280 | sigill: |
8dad3f92 PM |
1281 | if (reason & REASON_PRIVILEGED) |
1282 | _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); | |
1283 | else | |
1284 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
ba12eede LZ |
1285 | |
1286 | bail: | |
1287 | exception_exit(prev_state); | |
14cf11af | 1288 | } |
03465f89 | 1289 | NOKPROBE_SYMBOL(program_check_exception); |
14cf11af | 1290 | |
bf593907 PM |
1291 | /* |
1292 | * This occurs when running in hypervisor mode on POWER6 or later | |
1293 | * and an illegal instruction is encountered. | |
1294 | */ | |
03465f89 | 1295 | void emulation_assist_interrupt(struct pt_regs *regs) |
bf593907 PM |
1296 | { |
1297 | regs->msr |= REASON_ILLEGAL; | |
1298 | program_check_exception(regs); | |
1299 | } | |
03465f89 | 1300 | NOKPROBE_SYMBOL(emulation_assist_interrupt); |
bf593907 | 1301 | |
dc1c1ca3 | 1302 | void alignment_exception(struct pt_regs *regs) |
14cf11af | 1303 | { |
ba12eede | 1304 | enum ctx_state prev_state = exception_enter(); |
4393c4f6 | 1305 | int sig, code, fixed = 0; |
14cf11af | 1306 | |
a3512b2d BH |
1307 | /* We restore the interrupt state now */ |
1308 | if (!arch_irq_disabled_regs(regs)) | |
1309 | local_irq_enable(); | |
1310 | ||
6ce6c629 MN |
1311 | if (tm_abort_check(regs, TM_CAUSE_ALIGNMENT | TM_CAUSE_PERSISTENT)) |
1312 | goto bail; | |
1313 | ||
e9370ae1 PM |
1314 | /* we don't implement logging of alignment exceptions */ |
1315 | if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS)) | |
1316 | fixed = fix_alignment(regs); | |
14cf11af PM |
1317 | |
1318 | if (fixed == 1) { | |
1319 | regs->nip += 4; /* skip over emulated instruction */ | |
1320 | emulate_single_step(regs); | |
ba12eede | 1321 | goto bail; |
14cf11af PM |
1322 | } |
1323 | ||
dc1c1ca3 | 1324 | /* Operand address was bad */ |
14cf11af | 1325 | if (fixed == -EFAULT) { |
4393c4f6 BH |
1326 | sig = SIGSEGV; |
1327 | code = SEGV_ACCERR; | |
1328 | } else { | |
1329 | sig = SIGBUS; | |
1330 | code = BUS_ADRALN; | |
14cf11af | 1331 | } |
4393c4f6 BH |
1332 | if (user_mode(regs)) |
1333 | _exception(sig, regs, code, regs->dar); | |
1334 | else | |
1335 | bad_page_fault(regs, regs->dar, sig); | |
ba12eede LZ |
1336 | |
1337 | bail: | |
1338 | exception_exit(prev_state); | |
14cf11af PM |
1339 | } |
1340 | ||
f0f558b1 PM |
1341 | void slb_miss_bad_addr(struct pt_regs *regs) |
1342 | { | |
1343 | enum ctx_state prev_state = exception_enter(); | |
1344 | ||
1345 | if (user_mode(regs)) | |
1346 | _exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar); | |
1347 | else | |
1348 | bad_page_fault(regs, regs->dar, SIGSEGV); | |
1349 | ||
1350 | exception_exit(prev_state); | |
1351 | } | |
1352 | ||
14cf11af PM |
1353 | void StackOverflow(struct pt_regs *regs) |
1354 | { | |
1355 | printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n", | |
1356 | current, regs->gpr[1]); | |
1357 | debugger(regs); | |
1358 | show_regs(regs); | |
1359 | panic("kernel stack overflow"); | |
1360 | } | |
1361 | ||
1362 | void nonrecoverable_exception(struct pt_regs *regs) | |
1363 | { | |
1364 | printk(KERN_ERR "Non-recoverable exception at PC=%lx MSR=%lx\n", | |
1365 | regs->nip, regs->msr); | |
1366 | debugger(regs); | |
1367 | die("nonrecoverable exception", regs, SIGKILL); | |
1368 | } | |
1369 | ||
dc1c1ca3 SR |
1370 | void kernel_fp_unavailable_exception(struct pt_regs *regs) |
1371 | { | |
ba12eede LZ |
1372 | enum ctx_state prev_state = exception_enter(); |
1373 | ||
dc1c1ca3 SR |
1374 | printk(KERN_EMERG "Unrecoverable FP Unavailable Exception " |
1375 | "%lx at %lx\n", regs->trap, regs->nip); | |
1376 | die("Unrecoverable FP Unavailable Exception", regs, SIGABRT); | |
ba12eede LZ |
1377 | |
1378 | exception_exit(prev_state); | |
dc1c1ca3 | 1379 | } |
dc1c1ca3 SR |
1380 | |
1381 | void altivec_unavailable_exception(struct pt_regs *regs) | |
1382 | { | |
ba12eede LZ |
1383 | enum ctx_state prev_state = exception_enter(); |
1384 | ||
dc1c1ca3 SR |
1385 | if (user_mode(regs)) { |
1386 | /* A user program has executed an altivec instruction, | |
1387 | but this kernel doesn't support altivec. */ | |
1388 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
ba12eede | 1389 | goto bail; |
dc1c1ca3 | 1390 | } |
6c4841c2 | 1391 | |
dc1c1ca3 SR |
1392 | printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception " |
1393 | "%lx at %lx\n", regs->trap, regs->nip); | |
1394 | die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT); | |
ba12eede LZ |
1395 | |
1396 | bail: | |
1397 | exception_exit(prev_state); | |
dc1c1ca3 SR |
1398 | } |
1399 | ||
ce48b210 MN |
1400 | void vsx_unavailable_exception(struct pt_regs *regs) |
1401 | { | |
1402 | if (user_mode(regs)) { | |
1403 | /* A user program has executed an vsx instruction, | |
1404 | but this kernel doesn't support vsx. */ | |
1405 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1406 | return; | |
1407 | } | |
1408 | ||
1409 | printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception " | |
1410 | "%lx at %lx\n", regs->trap, regs->nip); | |
1411 | die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT); | |
1412 | } | |
1413 | ||
2517617e | 1414 | #ifdef CONFIG_PPC64 |
172f7aaa CB |
1415 | static void tm_unavailable(struct pt_regs *regs) |
1416 | { | |
5d176f75 CB |
1417 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1418 | if (user_mode(regs)) { | |
1419 | current->thread.load_tm++; | |
1420 | regs->msr |= MSR_TM; | |
1421 | tm_enable(); | |
1422 | tm_restore_sprs(¤t->thread); | |
1423 | return; | |
1424 | } | |
1425 | #endif | |
172f7aaa CB |
1426 | pr_emerg("Unrecoverable TM Unavailable Exception " |
1427 | "%lx at %lx\n", regs->trap, regs->nip); | |
1428 | die("Unrecoverable TM Unavailable Exception", regs, SIGABRT); | |
1429 | } | |
1430 | ||
021424a1 | 1431 | void facility_unavailable_exception(struct pt_regs *regs) |
d0c0c9a1 | 1432 | { |
021424a1 | 1433 | static char *facility_strings[] = { |
2517617e MN |
1434 | [FSCR_FP_LG] = "FPU", |
1435 | [FSCR_VECVSX_LG] = "VMX/VSX", | |
1436 | [FSCR_DSCR_LG] = "DSCR", | |
1437 | [FSCR_PM_LG] = "PMU SPRs", | |
1438 | [FSCR_BHRB_LG] = "BHRB", | |
1439 | [FSCR_TM_LG] = "TM", | |
1440 | [FSCR_EBB_LG] = "EBB", | |
1441 | [FSCR_TAR_LG] = "TAR", | |
021424a1 | 1442 | }; |
2517617e | 1443 | char *facility = "unknown"; |
021424a1 | 1444 | u64 value; |
c952c1c4 | 1445 | u32 instword, rd; |
2517617e MN |
1446 | u8 status; |
1447 | bool hv; | |
021424a1 | 1448 | |
2517617e MN |
1449 | hv = (regs->trap == 0xf80); |
1450 | if (hv) | |
b14b6260 | 1451 | value = mfspr(SPRN_HFSCR); |
2517617e MN |
1452 | else |
1453 | value = mfspr(SPRN_FSCR); | |
1454 | ||
1455 | status = value >> 56; | |
1456 | if (status == FSCR_DSCR_LG) { | |
c952c1c4 AK |
1457 | /* |
1458 | * User is accessing the DSCR register using the problem | |
1459 | * state only SPR number (0x03) either through a mfspr or | |
1460 | * a mtspr instruction. If it is a write attempt through | |
1461 | * a mtspr, then we set the inherit bit. This also allows | |
1462 | * the user to write or read the register directly in the | |
1463 | * future by setting via the FSCR DSCR bit. But in case it | |
1464 | * is a read DSCR attempt through a mfspr instruction, we | |
1465 | * just emulate the instruction instead. This code path will | |
1466 | * always emulate all the mfspr instructions till the user | |
446957ba | 1467 | * has attempted at least one mtspr instruction. This way it |
c952c1c4 AK |
1468 | * preserves the same behaviour when the user is accessing |
1469 | * the DSCR through privilege level only SPR number (0x11) | |
1470 | * which is emulated through illegal instruction exception. | |
1471 | * We always leave HFSCR DSCR set. | |
2517617e | 1472 | */ |
c952c1c4 AK |
1473 | if (get_user(instword, (u32 __user *)(regs->nip))) { |
1474 | pr_err("Failed to fetch the user instruction\n"); | |
1475 | return; | |
1476 | } | |
1477 | ||
1478 | /* Write into DSCR (mtspr 0x03, RS) */ | |
1479 | if ((instword & PPC_INST_MTSPR_DSCR_USER_MASK) | |
1480 | == PPC_INST_MTSPR_DSCR_USER) { | |
1481 | rd = (instword >> 21) & 0x1f; | |
1482 | current->thread.dscr = regs->gpr[rd]; | |
1483 | current->thread.dscr_inherit = 1; | |
b57bd2de MN |
1484 | current->thread.fscr |= FSCR_DSCR; |
1485 | mtspr(SPRN_FSCR, current->thread.fscr); | |
c952c1c4 AK |
1486 | } |
1487 | ||
1488 | /* Read from DSCR (mfspr RT, 0x03) */ | |
1489 | if ((instword & PPC_INST_MFSPR_DSCR_USER_MASK) | |
1490 | == PPC_INST_MFSPR_DSCR_USER) { | |
1491 | if (emulate_instruction(regs)) { | |
1492 | pr_err("DSCR based mfspr emulation failed\n"); | |
1493 | return; | |
1494 | } | |
1495 | regs->nip += 4; | |
1496 | emulate_single_step(regs); | |
1497 | } | |
2517617e | 1498 | return; |
b14b6260 ME |
1499 | } |
1500 | ||
172f7aaa CB |
1501 | if (status == FSCR_TM_LG) { |
1502 | /* | |
1503 | * If we're here then the hardware is TM aware because it | |
1504 | * generated an exception with FSRM_TM set. | |
1505 | * | |
1506 | * If cpu_has_feature(CPU_FTR_TM) is false, then either firmware | |
1507 | * told us not to do TM, or the kernel is not built with TM | |
1508 | * support. | |
1509 | * | |
1510 | * If both of those things are true, then userspace can spam the | |
1511 | * console by triggering the printk() below just by continually | |
1512 | * doing tbegin (or any TM instruction). So in that case just | |
1513 | * send the process a SIGILL immediately. | |
1514 | */ | |
1515 | if (!cpu_has_feature(CPU_FTR_TM)) | |
1516 | goto out; | |
1517 | ||
1518 | tm_unavailable(regs); | |
1519 | return; | |
1520 | } | |
1521 | ||
93c2ec0f BS |
1522 | if ((hv || status >= 2) && |
1523 | (status < ARRAY_SIZE(facility_strings)) && | |
2517617e MN |
1524 | facility_strings[status]) |
1525 | facility = facility_strings[status]; | |
021424a1 | 1526 | |
d0c0c9a1 MN |
1527 | /* We restore the interrupt state now */ |
1528 | if (!arch_irq_disabled_regs(regs)) | |
1529 | local_irq_enable(); | |
1530 | ||
93c2ec0f BS |
1531 | pr_err_ratelimited("%sFacility '%s' unavailable (%d), exception at 0x%lx, MSR=%lx\n", |
1532 | hv ? "Hypervisor " : "", facility, status, regs->nip, regs->msr); | |
d0c0c9a1 | 1533 | |
172f7aaa | 1534 | out: |
d0c0c9a1 MN |
1535 | if (user_mode(regs)) { |
1536 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); | |
1537 | return; | |
1538 | } | |
1539 | ||
021424a1 | 1540 | die("Unexpected facility unavailable exception", regs, SIGABRT); |
d0c0c9a1 | 1541 | } |
2517617e | 1542 | #endif |
d0c0c9a1 | 1543 | |
f54db641 MN |
1544 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1545 | ||
f54db641 MN |
1546 | void fp_unavailable_tm(struct pt_regs *regs) |
1547 | { | |
1548 | /* Note: This does not handle any kind of FP laziness. */ | |
1549 | ||
1550 | TM_DEBUG("FP Unavailable trap whilst transactional at 0x%lx, MSR=%lx\n", | |
1551 | regs->nip, regs->msr); | |
f54db641 MN |
1552 | |
1553 | /* We can only have got here if the task started using FP after | |
1554 | * beginning the transaction. So, the transactional regs are just a | |
1555 | * copy of the checkpointed ones. But, we still need to recheckpoint | |
1556 | * as we're enabling FP for the process; it will return, abort the | |
1557 | * transaction, and probably retry but now with FP enabled. So the | |
1558 | * checkpointed FP registers need to be loaded. | |
1559 | */ | |
d31626f7 | 1560 | tm_reclaim_current(TM_CAUSE_FAC_UNAV); |
f54db641 MN |
1561 | /* Reclaim didn't save out any FPRs to transact_fprs. */ |
1562 | ||
1563 | /* Enable FP for the task: */ | |
1564 | regs->msr |= (MSR_FP | current->thread.fpexc_mode); | |
1565 | ||
1566 | /* This loads and recheckpoints the FP registers from | |
1567 | * thread.fpr[]. They will remain in registers after the | |
1568 | * checkpoint so we don't need to reload them after. | |
3ac8ff1c PM |
1569 | * If VMX is in use, the VRs now hold checkpointed values, |
1570 | * so we don't want to load the VRs from the thread_struct. | |
f54db641 | 1571 | */ |
3ac8ff1c PM |
1572 | tm_recheckpoint(¤t->thread, MSR_FP); |
1573 | ||
1574 | /* If VMX is in use, get the transactional values back */ | |
1575 | if (regs->msr & MSR_VEC) { | |
dc310669 CB |
1576 | msr_check_and_set(MSR_VEC); |
1577 | load_vr_state(¤t->thread.vr_state); | |
3ac8ff1c PM |
1578 | /* At this point all the VSX state is loaded, so enable it */ |
1579 | regs->msr |= MSR_VSX; | |
1580 | } | |
f54db641 MN |
1581 | } |
1582 | ||
f54db641 MN |
1583 | void altivec_unavailable_tm(struct pt_regs *regs) |
1584 | { | |
1585 | /* See the comments in fp_unavailable_tm(). This function operates | |
1586 | * the same way. | |
1587 | */ | |
1588 | ||
1589 | TM_DEBUG("Vector Unavailable trap whilst transactional at 0x%lx," | |
1590 | "MSR=%lx\n", | |
1591 | regs->nip, regs->msr); | |
d31626f7 | 1592 | tm_reclaim_current(TM_CAUSE_FAC_UNAV); |
f54db641 | 1593 | regs->msr |= MSR_VEC; |
3ac8ff1c | 1594 | tm_recheckpoint(¤t->thread, MSR_VEC); |
f54db641 | 1595 | current->thread.used_vr = 1; |
3ac8ff1c PM |
1596 | |
1597 | if (regs->msr & MSR_FP) { | |
dc310669 CB |
1598 | msr_check_and_set(MSR_FP); |
1599 | load_fp_state(¤t->thread.fp_state); | |
3ac8ff1c PM |
1600 | regs->msr |= MSR_VSX; |
1601 | } | |
f54db641 | 1602 | } |
f54db641 | 1603 | |
f54db641 MN |
1604 | void vsx_unavailable_tm(struct pt_regs *regs) |
1605 | { | |
3ac8ff1c PM |
1606 | unsigned long orig_msr = regs->msr; |
1607 | ||
f54db641 MN |
1608 | /* See the comments in fp_unavailable_tm(). This works similarly, |
1609 | * though we're loading both FP and VEC registers in here. | |
1610 | * | |
1611 | * If FP isn't in use, load FP regs. If VEC isn't in use, load VEC | |
1612 | * regs. Either way, set MSR_VSX. | |
1613 | */ | |
1614 | ||
1615 | TM_DEBUG("VSX Unavailable trap whilst transactional at 0x%lx," | |
1616 | "MSR=%lx\n", | |
1617 | regs->nip, regs->msr); | |
1618 | ||
3ac8ff1c PM |
1619 | current->thread.used_vsr = 1; |
1620 | ||
1621 | /* If FP and VMX are already loaded, we have all the state we need */ | |
1622 | if ((orig_msr & (MSR_FP | MSR_VEC)) == (MSR_FP | MSR_VEC)) { | |
1623 | regs->msr |= MSR_VSX; | |
1624 | return; | |
1625 | } | |
1626 | ||
f54db641 | 1627 | /* This reclaims FP and/or VR regs if they're already enabled */ |
d31626f7 | 1628 | tm_reclaim_current(TM_CAUSE_FAC_UNAV); |
f54db641 MN |
1629 | |
1630 | regs->msr |= MSR_VEC | MSR_FP | current->thread.fpexc_mode | | |
1631 | MSR_VSX; | |
3ac8ff1c PM |
1632 | |
1633 | /* This loads & recheckpoints FP and VRs; but we have | |
1634 | * to be sure not to overwrite previously-valid state. | |
1635 | */ | |
1636 | tm_recheckpoint(¤t->thread, regs->msr & ~orig_msr); | |
1637 | ||
dc310669 CB |
1638 | msr_check_and_set(orig_msr & (MSR_FP | MSR_VEC)); |
1639 | ||
3ac8ff1c | 1640 | if (orig_msr & MSR_FP) |
dc310669 | 1641 | load_fp_state(¤t->thread.fp_state); |
3ac8ff1c | 1642 | if (orig_msr & MSR_VEC) |
dc310669 | 1643 | load_vr_state(¤t->thread.vr_state); |
f54db641 | 1644 | } |
f54db641 MN |
1645 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ |
1646 | ||
dc1c1ca3 SR |
1647 | void performance_monitor_exception(struct pt_regs *regs) |
1648 | { | |
69111bac | 1649 | __this_cpu_inc(irq_stat.pmu_irqs); |
89713ed1 | 1650 | |
dc1c1ca3 SR |
1651 | perf_irq(regs); |
1652 | } | |
dc1c1ca3 | 1653 | |
8dad3f92 | 1654 | #ifdef CONFIG_8xx |
14cf11af PM |
1655 | void SoftwareEmulation(struct pt_regs *regs) |
1656 | { | |
14cf11af PM |
1657 | CHECK_FULL_REGS(regs); |
1658 | ||
1659 | if (!user_mode(regs)) { | |
1660 | debugger(regs); | |
1eb2819d LC |
1661 | die("Kernel Mode Unimplemented Instruction or SW FPU Emulation", |
1662 | regs, SIGFPE); | |
14cf11af PM |
1663 | } |
1664 | ||
3a3b5aa6 | 1665 | if (!emulate_math(regs)) |
5fad293b | 1666 | return; |
3a3b5aa6 | 1667 | |
5dd57a13 | 1668 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); |
14cf11af | 1669 | } |
8dad3f92 | 1670 | #endif /* CONFIG_8xx */ |
14cf11af | 1671 | |
172ae2e7 | 1672 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
3bffb652 DK |
1673 | static void handle_debug(struct pt_regs *regs, unsigned long debug_status) |
1674 | { | |
1675 | int changed = 0; | |
1676 | /* | |
1677 | * Determine the cause of the debug event, clear the | |
1678 | * event flags and send a trap to the handler. Torez | |
1679 | */ | |
1680 | if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) { | |
1681 | dbcr_dac(current) &= ~(DBCR_DAC1R | DBCR_DAC1W); | |
1682 | #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE | |
51ae8d4a | 1683 | current->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE; |
3bffb652 DK |
1684 | #endif |
1685 | do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT, | |
1686 | 5); | |
1687 | changed |= 0x01; | |
1688 | } else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) { | |
1689 | dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W); | |
1690 | do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT, | |
1691 | 6); | |
1692 | changed |= 0x01; | |
1693 | } else if (debug_status & DBSR_IAC1) { | |
51ae8d4a | 1694 | current->thread.debug.dbcr0 &= ~DBCR0_IAC1; |
3bffb652 DK |
1695 | dbcr_iac_range(current) &= ~DBCR_IAC12MODE; |
1696 | do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT, | |
1697 | 1); | |
1698 | changed |= 0x01; | |
1699 | } else if (debug_status & DBSR_IAC2) { | |
51ae8d4a | 1700 | current->thread.debug.dbcr0 &= ~DBCR0_IAC2; |
3bffb652 DK |
1701 | do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT, |
1702 | 2); | |
1703 | changed |= 0x01; | |
1704 | } else if (debug_status & DBSR_IAC3) { | |
51ae8d4a | 1705 | current->thread.debug.dbcr0 &= ~DBCR0_IAC3; |
3bffb652 DK |
1706 | dbcr_iac_range(current) &= ~DBCR_IAC34MODE; |
1707 | do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT, | |
1708 | 3); | |
1709 | changed |= 0x01; | |
1710 | } else if (debug_status & DBSR_IAC4) { | |
51ae8d4a | 1711 | current->thread.debug.dbcr0 &= ~DBCR0_IAC4; |
3bffb652 DK |
1712 | do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT, |
1713 | 4); | |
1714 | changed |= 0x01; | |
1715 | } | |
1716 | /* | |
1717 | * At the point this routine was called, the MSR(DE) was turned off. | |
1718 | * Check all other debug flags and see if that bit needs to be turned | |
1719 | * back on or not. | |
1720 | */ | |
51ae8d4a | 1721 | if (DBCR_ACTIVE_EVENTS(current->thread.debug.dbcr0, |
95791988 | 1722 | current->thread.debug.dbcr1)) |
3bffb652 DK |
1723 | regs->msr |= MSR_DE; |
1724 | else | |
1725 | /* Make sure the IDM flag is off */ | |
51ae8d4a | 1726 | current->thread.debug.dbcr0 &= ~DBCR0_IDM; |
3bffb652 DK |
1727 | |
1728 | if (changed & 0x01) | |
51ae8d4a | 1729 | mtspr(SPRN_DBCR0, current->thread.debug.dbcr0); |
3bffb652 | 1730 | } |
14cf11af | 1731 | |
03465f89 | 1732 | void DebugException(struct pt_regs *regs, unsigned long debug_status) |
14cf11af | 1733 | { |
51ae8d4a | 1734 | current->thread.debug.dbsr = debug_status; |
3bffb652 | 1735 | |
ec097c84 RM |
1736 | /* Hack alert: On BookE, Branch Taken stops on the branch itself, while |
1737 | * on server, it stops on the target of the branch. In order to simulate | |
1738 | * the server behaviour, we thus restart right away with a single step | |
1739 | * instead of stopping here when hitting a BT | |
1740 | */ | |
1741 | if (debug_status & DBSR_BT) { | |
1742 | regs->msr &= ~MSR_DE; | |
1743 | ||
1744 | /* Disable BT */ | |
1745 | mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_BT); | |
1746 | /* Clear the BT event */ | |
1747 | mtspr(SPRN_DBSR, DBSR_BT); | |
1748 | ||
1749 | /* Do the single step trick only when coming from userspace */ | |
1750 | if (user_mode(regs)) { | |
51ae8d4a BB |
1751 | current->thread.debug.dbcr0 &= ~DBCR0_BT; |
1752 | current->thread.debug.dbcr0 |= DBCR0_IDM | DBCR0_IC; | |
ec097c84 RM |
1753 | regs->msr |= MSR_DE; |
1754 | return; | |
1755 | } | |
1756 | ||
6cc89bad NR |
1757 | if (kprobe_post_handler(regs)) |
1758 | return; | |
1759 | ||
ec097c84 RM |
1760 | if (notify_die(DIE_SSTEP, "block_step", regs, 5, |
1761 | 5, SIGTRAP) == NOTIFY_STOP) { | |
1762 | return; | |
1763 | } | |
1764 | if (debugger_sstep(regs)) | |
1765 | return; | |
1766 | } else if (debug_status & DBSR_IC) { /* Instruction complete */ | |
14cf11af | 1767 | regs->msr &= ~MSR_DE; |
f8279621 KG |
1768 | |
1769 | /* Disable instruction completion */ | |
1770 | mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC); | |
1771 | /* Clear the instruction completion event */ | |
1772 | mtspr(SPRN_DBSR, DBSR_IC); | |
1773 | ||
6cc89bad NR |
1774 | if (kprobe_post_handler(regs)) |
1775 | return; | |
1776 | ||
f8279621 KG |
1777 | if (notify_die(DIE_SSTEP, "single_step", regs, 5, |
1778 | 5, SIGTRAP) == NOTIFY_STOP) { | |
1779 | return; | |
1780 | } | |
1781 | ||
1782 | if (debugger_sstep(regs)) | |
1783 | return; | |
1784 | ||
d6a61bfc | 1785 | if (user_mode(regs)) { |
51ae8d4a BB |
1786 | current->thread.debug.dbcr0 &= ~DBCR0_IC; |
1787 | if (DBCR_ACTIVE_EVENTS(current->thread.debug.dbcr0, | |
1788 | current->thread.debug.dbcr1)) | |
3bffb652 DK |
1789 | regs->msr |= MSR_DE; |
1790 | else | |
1791 | /* Make sure the IDM bit is off */ | |
51ae8d4a | 1792 | current->thread.debug.dbcr0 &= ~DBCR0_IDM; |
d6a61bfc | 1793 | } |
3bffb652 DK |
1794 | |
1795 | _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip); | |
1796 | } else | |
1797 | handle_debug(regs, debug_status); | |
14cf11af | 1798 | } |
03465f89 | 1799 | NOKPROBE_SYMBOL(DebugException); |
172ae2e7 | 1800 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
14cf11af PM |
1801 | |
1802 | #if !defined(CONFIG_TAU_INT) | |
1803 | void TAUException(struct pt_regs *regs) | |
1804 | { | |
1805 | printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n", | |
1806 | regs->nip, regs->msr, regs->trap, print_tainted()); | |
1807 | } | |
1808 | #endif /* CONFIG_INT_TAU */ | |
14cf11af PM |
1809 | |
1810 | #ifdef CONFIG_ALTIVEC | |
dc1c1ca3 | 1811 | void altivec_assist_exception(struct pt_regs *regs) |
14cf11af PM |
1812 | { |
1813 | int err; | |
1814 | ||
14cf11af PM |
1815 | if (!user_mode(regs)) { |
1816 | printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode" | |
1817 | " at %lx\n", regs->nip); | |
8dad3f92 | 1818 | die("Kernel VMX/Altivec assist exception", regs, SIGILL); |
14cf11af PM |
1819 | } |
1820 | ||
dc1c1ca3 | 1821 | flush_altivec_to_thread(current); |
dc1c1ca3 | 1822 | |
eecff81d | 1823 | PPC_WARN_EMULATED(altivec, regs); |
14cf11af PM |
1824 | err = emulate_altivec(regs); |
1825 | if (err == 0) { | |
1826 | regs->nip += 4; /* skip emulated instruction */ | |
1827 | emulate_single_step(regs); | |
1828 | return; | |
1829 | } | |
1830 | ||
1831 | if (err == -EFAULT) { | |
1832 | /* got an error reading the instruction */ | |
1833 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1834 | } else { | |
1835 | /* didn't recognize the instruction */ | |
1836 | /* XXX quick hack for now: set the non-Java bit in the VSCR */ | |
76462232 CD |
1837 | printk_ratelimited(KERN_ERR "Unrecognized altivec instruction " |
1838 | "in %s at %lx\n", current->comm, regs->nip); | |
de79f7b9 | 1839 | current->thread.vr_state.vscr.u[3] |= 0x10000; |
14cf11af PM |
1840 | } |
1841 | } | |
1842 | #endif /* CONFIG_ALTIVEC */ | |
1843 | ||
14cf11af PM |
1844 | #ifdef CONFIG_FSL_BOOKE |
1845 | void CacheLockingException(struct pt_regs *regs, unsigned long address, | |
1846 | unsigned long error_code) | |
1847 | { | |
1848 | /* We treat cache locking instructions from the user | |
1849 | * as priv ops, in the future we could try to do | |
1850 | * something smarter | |
1851 | */ | |
1852 | if (error_code & (ESR_DLK|ESR_ILK)) | |
1853 | _exception(SIGILL, regs, ILL_PRVOPC, regs->nip); | |
1854 | return; | |
1855 | } | |
1856 | #endif /* CONFIG_FSL_BOOKE */ | |
1857 | ||
1858 | #ifdef CONFIG_SPE | |
1859 | void SPEFloatingPointException(struct pt_regs *regs) | |
1860 | { | |
6a800f36 | 1861 | extern int do_spe_mathemu(struct pt_regs *regs); |
14cf11af PM |
1862 | unsigned long spefscr; |
1863 | int fpexc_mode; | |
1864 | int code = 0; | |
6a800f36 LY |
1865 | int err; |
1866 | ||
685659ee | 1867 | flush_spe_to_thread(current); |
14cf11af PM |
1868 | |
1869 | spefscr = current->thread.spefscr; | |
1870 | fpexc_mode = current->thread.fpexc_mode; | |
1871 | ||
14cf11af PM |
1872 | if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) { |
1873 | code = FPE_FLTOVF; | |
14cf11af PM |
1874 | } |
1875 | else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) { | |
1876 | code = FPE_FLTUND; | |
14cf11af PM |
1877 | } |
1878 | else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV)) | |
1879 | code = FPE_FLTDIV; | |
1880 | else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) { | |
1881 | code = FPE_FLTINV; | |
14cf11af PM |
1882 | } |
1883 | else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES)) | |
1884 | code = FPE_FLTRES; | |
1885 | ||
6a800f36 LY |
1886 | err = do_spe_mathemu(regs); |
1887 | if (err == 0) { | |
1888 | regs->nip += 4; /* skip emulated instruction */ | |
1889 | emulate_single_step(regs); | |
1890 | return; | |
1891 | } | |
1892 | ||
1893 | if (err == -EFAULT) { | |
1894 | /* got an error reading the instruction */ | |
1895 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1896 | } else if (err == -EINVAL) { | |
1897 | /* didn't recognize the instruction */ | |
1898 | printk(KERN_ERR "unrecognized spe instruction " | |
1899 | "in %s at %lx\n", current->comm, regs->nip); | |
1900 | } else { | |
1901 | _exception(SIGFPE, regs, code, regs->nip); | |
1902 | } | |
14cf11af | 1903 | |
14cf11af PM |
1904 | return; |
1905 | } | |
6a800f36 LY |
1906 | |
1907 | void SPEFloatingPointRoundException(struct pt_regs *regs) | |
1908 | { | |
1909 | extern int speround_handler(struct pt_regs *regs); | |
1910 | int err; | |
1911 | ||
1912 | preempt_disable(); | |
1913 | if (regs->msr & MSR_SPE) | |
1914 | giveup_spe(current); | |
1915 | preempt_enable(); | |
1916 | ||
1917 | regs->nip -= 4; | |
1918 | err = speround_handler(regs); | |
1919 | if (err == 0) { | |
1920 | regs->nip += 4; /* skip emulated instruction */ | |
1921 | emulate_single_step(regs); | |
1922 | return; | |
1923 | } | |
1924 | ||
1925 | if (err == -EFAULT) { | |
1926 | /* got an error reading the instruction */ | |
1927 | _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip); | |
1928 | } else if (err == -EINVAL) { | |
1929 | /* didn't recognize the instruction */ | |
1930 | printk(KERN_ERR "unrecognized spe instruction " | |
1931 | "in %s at %lx\n", current->comm, regs->nip); | |
1932 | } else { | |
1933 | _exception(SIGFPE, regs, 0, regs->nip); | |
1934 | return; | |
1935 | } | |
1936 | } | |
14cf11af PM |
1937 | #endif |
1938 | ||
dc1c1ca3 SR |
1939 | /* |
1940 | * We enter here if we get an unrecoverable exception, that is, one | |
1941 | * that happened at a point where the RI (recoverable interrupt) bit | |
1942 | * in the MSR is 0. This indicates that SRR0/1 are live, and that | |
1943 | * we therefore lost state by taking this exception. | |
1944 | */ | |
1945 | void unrecoverable_exception(struct pt_regs *regs) | |
1946 | { | |
1947 | printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n", | |
1948 | regs->trap, regs->nip); | |
1949 | die("Unrecoverable exception", regs, SIGABRT); | |
1950 | } | |
dc1c1ca3 | 1951 | |
1e18c17a | 1952 | #if defined(CONFIG_BOOKE_WDT) || defined(CONFIG_40x) |
14cf11af PM |
1953 | /* |
1954 | * Default handler for a Watchdog exception, | |
1955 | * spins until a reboot occurs | |
1956 | */ | |
1957 | void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs) | |
1958 | { | |
1959 | /* Generic WatchdogHandler, implement your own */ | |
1960 | mtspr(SPRN_TCR, mfspr(SPRN_TCR)&(~TCR_WIE)); | |
1961 | return; | |
1962 | } | |
1963 | ||
1964 | void WatchdogException(struct pt_regs *regs) | |
1965 | { | |
1966 | printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n"); | |
1967 | WatchdogHandler(regs); | |
1968 | } | |
1969 | #endif | |
dc1c1ca3 | 1970 | |
dc1c1ca3 SR |
1971 | /* |
1972 | * We enter here if we discover during exception entry that we are | |
1973 | * running in supervisor mode with a userspace value in the stack pointer. | |
1974 | */ | |
1975 | void kernel_bad_stack(struct pt_regs *regs) | |
1976 | { | |
1977 | printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n", | |
1978 | regs->gpr[1], regs->nip); | |
1979 | die("Bad kernel stack pointer", regs, SIGABRT); | |
1980 | } | |
14cf11af PM |
1981 | |
1982 | void __init trap_init(void) | |
1983 | { | |
1984 | } | |
80947e7c GU |
1985 | |
1986 | ||
1987 | #ifdef CONFIG_PPC_EMULATED_STATS | |
1988 | ||
1989 | #define WARN_EMULATED_SETUP(type) .type = { .name = #type } | |
1990 | ||
1991 | struct ppc_emulated ppc_emulated = { | |
1992 | #ifdef CONFIG_ALTIVEC | |
1993 | WARN_EMULATED_SETUP(altivec), | |
1994 | #endif | |
1995 | WARN_EMULATED_SETUP(dcba), | |
1996 | WARN_EMULATED_SETUP(dcbz), | |
1997 | WARN_EMULATED_SETUP(fp_pair), | |
1998 | WARN_EMULATED_SETUP(isel), | |
1999 | WARN_EMULATED_SETUP(mcrxr), | |
2000 | WARN_EMULATED_SETUP(mfpvr), | |
2001 | WARN_EMULATED_SETUP(multiple), | |
2002 | WARN_EMULATED_SETUP(popcntb), | |
2003 | WARN_EMULATED_SETUP(spe), | |
2004 | WARN_EMULATED_SETUP(string), | |
a3821b2a | 2005 | WARN_EMULATED_SETUP(sync), |
80947e7c GU |
2006 | WARN_EMULATED_SETUP(unaligned), |
2007 | #ifdef CONFIG_MATH_EMULATION | |
2008 | WARN_EMULATED_SETUP(math), | |
80947e7c GU |
2009 | #endif |
2010 | #ifdef CONFIG_VSX | |
2011 | WARN_EMULATED_SETUP(vsx), | |
2012 | #endif | |
efcac658 AK |
2013 | #ifdef CONFIG_PPC64 |
2014 | WARN_EMULATED_SETUP(mfdscr), | |
2015 | WARN_EMULATED_SETUP(mtdscr), | |
f83319d7 | 2016 | WARN_EMULATED_SETUP(lq_stq), |
efcac658 | 2017 | #endif |
80947e7c GU |
2018 | }; |
2019 | ||
2020 | u32 ppc_warn_emulated; | |
2021 | ||
2022 | void ppc_warn_emulated_print(const char *type) | |
2023 | { | |
76462232 CD |
2024 | pr_warn_ratelimited("%s used emulated %s instruction\n", current->comm, |
2025 | type); | |
80947e7c GU |
2026 | } |
2027 | ||
2028 | static int __init ppc_warn_emulated_init(void) | |
2029 | { | |
2030 | struct dentry *dir, *d; | |
2031 | unsigned int i; | |
2032 | struct ppc_emulated_entry *entries = (void *)&ppc_emulated; | |
2033 | ||
2034 | if (!powerpc_debugfs_root) | |
2035 | return -ENODEV; | |
2036 | ||
2037 | dir = debugfs_create_dir("emulated_instructions", | |
2038 | powerpc_debugfs_root); | |
2039 | if (!dir) | |
2040 | return -ENOMEM; | |
2041 | ||
2042 | d = debugfs_create_u32("do_warn", S_IRUGO | S_IWUSR, dir, | |
2043 | &ppc_warn_emulated); | |
2044 | if (!d) | |
2045 | goto fail; | |
2046 | ||
2047 | for (i = 0; i < sizeof(ppc_emulated)/sizeof(*entries); i++) { | |
2048 | d = debugfs_create_u32(entries[i].name, S_IRUGO | S_IWUSR, dir, | |
2049 | (u32 *)&entries[i].val.counter); | |
2050 | if (!d) | |
2051 | goto fail; | |
2052 | } | |
2053 | ||
2054 | return 0; | |
2055 | ||
2056 | fail: | |
2057 | debugfs_remove_recursive(dir); | |
2058 | return -ENOMEM; | |
2059 | } | |
2060 | ||
2061 | device_initcall(ppc_warn_emulated_init); | |
2062 | ||
2063 | #endif /* CONFIG_PPC_EMULATED_STATS */ |