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Commit | Line | Data |
---|---|---|
b00dc837 | 1 | /* |
1da177e4 LT |
2 | * arch/sparc64/mm/fault.c: Page fault handlers for the 64-bit Sparc. |
3 | * | |
4fe3ebec | 4 | * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
5 | * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz) |
6 | */ | |
7 | ||
8 | #include <asm/head.h> | |
9 | ||
10 | #include <linux/string.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/ptrace.h> | |
14 | #include <linux/mman.h> | |
15 | #include <linux/signal.h> | |
16 | #include <linux/mm.h> | |
cdd4f4c7 | 17 | #include <linux/extable.h> |
1da177e4 | 18 | #include <linux/init.h> |
a084b667 | 19 | #include <linux/perf_event.h> |
1da177e4 | 20 | #include <linux/interrupt.h> |
05e14cb3 | 21 | #include <linux/kprobes.h> |
1eeb66a1 | 22 | #include <linux/kdebug.h> |
eeabac73 | 23 | #include <linux/percpu.h> |
812cb83a | 24 | #include <linux/context_tracking.h> |
70ffdb93 | 25 | #include <linux/uaccess.h> |
1da177e4 LT |
26 | |
27 | #include <asm/page.h> | |
28 | #include <asm/pgtable.h> | |
29 | #include <asm/openprom.h> | |
30 | #include <asm/oplib.h> | |
1da177e4 LT |
31 | #include <asm/asi.h> |
32 | #include <asm/lsu.h> | |
33 | #include <asm/sections.h> | |
7a1ac526 | 34 | #include <asm/mmu_context.h> |
8df52620 | 35 | #include <asm/setup.h> |
1da177e4 | 36 | |
4b177647 DM |
37 | int show_unhandled_signals = 1; |
38 | ||
4ed5d5e4 | 39 | static inline __kprobes int notify_page_fault(struct pt_regs *regs) |
d98f8f05 | 40 | { |
127cda1e DM |
41 | int ret = 0; |
42 | ||
43 | /* kprobe_running() needs smp_processor_id() */ | |
135d0821 | 44 | if (kprobes_built_in() && !user_mode(regs)) { |
127cda1e DM |
45 | preempt_disable(); |
46 | if (kprobe_running() && kprobe_fault_handler(regs, 0)) | |
47 | ret = 1; | |
48 | preempt_enable(); | |
49 | } | |
50 | return ret; | |
d98f8f05 | 51 | } |
d98f8f05 | 52 | |
05e14cb3 PP |
53 | static void __kprobes unhandled_fault(unsigned long address, |
54 | struct task_struct *tsk, | |
55 | struct pt_regs *regs) | |
1da177e4 LT |
56 | { |
57 | if ((unsigned long) address < PAGE_SIZE) { | |
58 | printk(KERN_ALERT "Unable to handle kernel NULL " | |
59 | "pointer dereference\n"); | |
60 | } else { | |
61 | printk(KERN_ALERT "Unable to handle kernel paging request " | |
62 | "at virtual address %016lx\n", (unsigned long)address); | |
63 | } | |
64 | printk(KERN_ALERT "tsk->{mm,active_mm}->context = %016lx\n", | |
65 | (tsk->mm ? | |
66 | CTX_HWBITS(tsk->mm->context) : | |
67 | CTX_HWBITS(tsk->active_mm->context))); | |
68 | printk(KERN_ALERT "tsk->{mm,active_mm}->pgd = %016lx\n", | |
69 | (tsk->mm ? (unsigned long) tsk->mm->pgd : | |
70 | (unsigned long) tsk->active_mm->pgd)); | |
1da177e4 LT |
71 | die_if_kernel("Oops", regs); |
72 | } | |
73 | ||
4ed5d5e4 | 74 | static void __kprobes bad_kernel_pc(struct pt_regs *regs, unsigned long vaddr) |
1da177e4 | 75 | { |
1da177e4 LT |
76 | printk(KERN_CRIT "OOPS: Bogus kernel PC [%016lx] in fault handler\n", |
77 | regs->tpc); | |
eb398d10 | 78 | printk(KERN_CRIT "OOPS: RPC [%016lx]\n", regs->u_regs[15]); |
4fe3ebec | 79 | printk("OOPS: RPC <%pS>\n", (void *) regs->u_regs[15]); |
bf941d6c | 80 | printk(KERN_CRIT "OOPS: Fault was to vaddr[%lx]\n", vaddr); |
c1f193a7 | 81 | dump_stack(); |
1da177e4 LT |
82 | unhandled_fault(regs->tpc, current, regs); |
83 | } | |
84 | ||
85 | /* | |
86 | * We now make sure that mmap_sem is held in all paths that call | |
87 | * this. Additionally, to prevent kswapd from ripping ptes from | |
88 | * under us, raise interrupts around the time that we look at the | |
89 | * pte, kswapd will have to wait to get his smp ipi response from | |
da160546 | 90 | * us. vmtruncate likewise. This saves us having to get pte lock. |
1da177e4 LT |
91 | */ |
92 | static unsigned int get_user_insn(unsigned long tpc) | |
93 | { | |
94 | pgd_t *pgdp = pgd_offset(current->mm, tpc); | |
95 | pud_t *pudp; | |
96 | pmd_t *pmdp; | |
97 | pte_t *ptep, pte; | |
98 | unsigned long pa; | |
99 | u32 insn = 0; | |
1da177e4 | 100 | |
70ffc6eb DM |
101 | if (pgd_none(*pgdp) || unlikely(pgd_bad(*pgdp))) |
102 | goto out; | |
1da177e4 | 103 | pudp = pud_offset(pgdp, tpc); |
70ffc6eb DM |
104 | if (pud_none(*pudp) || unlikely(pud_bad(*pudp))) |
105 | goto out; | |
1da177e4 LT |
106 | |
107 | /* This disables preemption for us as well. */ | |
70ffc6eb | 108 | local_irq_disable(); |
1da177e4 | 109 | |
70ffc6eb DM |
110 | pmdp = pmd_offset(pudp, tpc); |
111 | if (pmd_none(*pmdp) || unlikely(pmd_bad(*pmdp))) | |
112 | goto out_irq_enable; | |
113 | ||
7bc3777c NG |
114 | #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE) |
115 | if (is_hugetlb_pmd(*pmdp)) { | |
70ffc6eb DM |
116 | pa = pmd_pfn(*pmdp) << PAGE_SHIFT; |
117 | pa += tpc & ~HPAGE_MASK; | |
1da177e4 | 118 | |
70ffc6eb DM |
119 | /* Use phys bypass so we don't pollute dtlb/dcache. */ |
120 | __asm__ __volatile__("lduwa [%1] %2, %0" | |
121 | : "=r" (insn) | |
122 | : "r" (pa), "i" (ASI_PHYS_USE_EC)); | |
123 | } else | |
124 | #endif | |
125 | { | |
126 | ptep = pte_offset_map(pmdp, tpc); | |
127 | pte = *ptep; | |
128 | if (pte_present(pte)) { | |
129 | pa = (pte_pfn(pte) << PAGE_SHIFT); | |
130 | pa += (tpc & ~PAGE_MASK); | |
131 | ||
132 | /* Use phys bypass so we don't pollute dtlb/dcache. */ | |
133 | __asm__ __volatile__("lduwa [%1] %2, %0" | |
134 | : "=r" (insn) | |
135 | : "r" (pa), "i" (ASI_PHYS_USE_EC)); | |
136 | } | |
137 | pte_unmap(ptep); | |
138 | } | |
139 | out_irq_enable: | |
140 | local_irq_enable(); | |
1da177e4 | 141 | out: |
1da177e4 LT |
142 | return insn; |
143 | } | |
144 | ||
4b177647 DM |
145 | static inline void |
146 | show_signal_msg(struct pt_regs *regs, int sig, int code, | |
147 | unsigned long address, struct task_struct *tsk) | |
148 | { | |
149 | if (!unhandled_signal(tsk, sig)) | |
150 | return; | |
151 | ||
152 | if (!printk_ratelimit()) | |
153 | return; | |
154 | ||
155 | printk("%s%s[%d]: segfault at %lx ip %p (rpc %p) sp %p error %x", | |
156 | task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG, | |
157 | tsk->comm, task_pid_nr(tsk), address, | |
158 | (void *)regs->tpc, (void *)regs->u_regs[UREG_I7], | |
159 | (void *)regs->u_regs[UREG_FP], code); | |
160 | ||
161 | print_vma_addr(KERN_CONT " in ", regs->tpc); | |
162 | ||
163 | printk(KERN_CONT "\n"); | |
164 | } | |
165 | ||
1da177e4 | 166 | static void do_fault_siginfo(int code, int sig, struct pt_regs *regs, |
70ffc6eb DM |
167 | unsigned long fault_addr, unsigned int insn, |
168 | int fault_code) | |
1da177e4 | 169 | { |
4b177647 | 170 | unsigned long addr; |
1da177e4 LT |
171 | siginfo_t info; |
172 | ||
173 | info.si_code = code; | |
174 | info.si_signo = sig; | |
175 | info.si_errno = 0; | |
70ffc6eb | 176 | if (fault_code & FAULT_CODE_ITLB) { |
4b177647 | 177 | addr = regs->tpc; |
70ffc6eb DM |
178 | } else { |
179 | /* If we were able to probe the faulting instruction, use it | |
180 | * to compute a precise fault address. Otherwise use the fault | |
181 | * time provided address which may only have page granularity. | |
182 | */ | |
183 | if (insn) | |
184 | addr = compute_effective_address(regs, insn, 0); | |
185 | else | |
186 | addr = fault_addr; | |
187 | } | |
4b177647 | 188 | info.si_addr = (void __user *) addr; |
1da177e4 | 189 | info.si_trapno = 0; |
4b177647 DM |
190 | |
191 | if (unlikely(show_unhandled_signals)) | |
192 | show_signal_msg(regs, sig, code, addr, current); | |
193 | ||
1da177e4 LT |
194 | force_sig_info(sig, &info, current); |
195 | } | |
196 | ||
1da177e4 LT |
197 | static unsigned int get_fault_insn(struct pt_regs *regs, unsigned int insn) |
198 | { | |
199 | if (!insn) { | |
200 | if (!regs->tpc || (regs->tpc & 0x3)) | |
201 | return 0; | |
202 | if (regs->tstate & TSTATE_PRIV) { | |
203 | insn = *(unsigned int *) regs->tpc; | |
204 | } else { | |
205 | insn = get_user_insn(regs->tpc); | |
206 | } | |
207 | } | |
208 | return insn; | |
209 | } | |
210 | ||
4ed5d5e4 DM |
211 | static void __kprobes do_kernel_fault(struct pt_regs *regs, int si_code, |
212 | int fault_code, unsigned int insn, | |
213 | unsigned long address) | |
1da177e4 | 214 | { |
1da177e4 LT |
215 | unsigned char asi = ASI_P; |
216 | ||
217 | if ((!insn) && (regs->tstate & TSTATE_PRIV)) | |
218 | goto cannot_handle; | |
219 | ||
220 | /* If user insn could be read (thus insn is zero), that | |
221 | * is fine. We will just gun down the process with a signal | |
222 | * in that case. | |
223 | */ | |
224 | ||
225 | if (!(fault_code & (FAULT_CODE_WRITE|FAULT_CODE_ITLB)) && | |
226 | (insn & 0xc0800000) == 0xc0800000) { | |
227 | if (insn & 0x2000) | |
228 | asi = (regs->tstate >> 24); | |
229 | else | |
230 | asi = (insn >> 5); | |
231 | if ((asi & 0xf2) == 0x82) { | |
232 | if (insn & 0x1000000) { | |
233 | handle_ldf_stq(insn, regs); | |
234 | } else { | |
235 | /* This was a non-faulting load. Just clear the | |
236 | * destination register(s) and continue with the next | |
237 | * instruction. -jj | |
238 | */ | |
239 | handle_ld_nf(insn, regs); | |
240 | } | |
241 | return; | |
242 | } | |
243 | } | |
244 | ||
1da177e4 LT |
245 | /* Is this in ex_table? */ |
246 | if (regs->tstate & TSTATE_PRIV) { | |
8cf14af0 | 247 | const struct exception_table_entry *entry; |
1da177e4 | 248 | |
622eaec6 DM |
249 | entry = search_exception_tables(regs->tpc); |
250 | if (entry) { | |
8cf14af0 | 251 | regs->tpc = entry->fixup; |
1da177e4 | 252 | regs->tnpc = regs->tpc + 4; |
1da177e4 LT |
253 | return; |
254 | } | |
255 | } else { | |
256 | /* The si_code was set to make clear whether | |
257 | * this was a SEGV_MAPERR or SEGV_ACCERR fault. | |
258 | */ | |
70ffc6eb | 259 | do_fault_siginfo(si_code, SIGSEGV, regs, address, insn, fault_code); |
1da177e4 LT |
260 | return; |
261 | } | |
262 | ||
263 | cannot_handle: | |
264 | unhandled_fault (address, current, regs); | |
265 | } | |
266 | ||
4ed5d5e4 | 267 | static void noinline __kprobes bogus_32bit_fault_tpc(struct pt_regs *regs) |
9b026058 DM |
268 | { |
269 | static int times; | |
270 | ||
271 | if (times++ < 10) | |
272 | printk(KERN_ERR "FAULT[%s:%d]: 32-bit process reports " | |
273 | "64-bit TPC [%lx]\n", | |
274 | current->comm, current->pid, | |
275 | regs->tpc); | |
276 | show_regs(regs); | |
277 | } | |
278 | ||
05e14cb3 | 279 | asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs) |
1da177e4 | 280 | { |
812cb83a | 281 | enum ctx_state prev_state = exception_enter(); |
1da177e4 LT |
282 | struct mm_struct *mm = current->mm; |
283 | struct vm_area_struct *vma; | |
284 | unsigned int insn = 0; | |
83c54070 | 285 | int si_code, fault_code, fault; |
7a1ac526 | 286 | unsigned long address, mm_rss; |
7358e510 | 287 | unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; |
1da177e4 LT |
288 | |
289 | fault_code = get_thread_fault_code(); | |
290 | ||
127cda1e | 291 | if (notify_page_fault(regs)) |
812cb83a | 292 | goto exit_exception; |
1da177e4 LT |
293 | |
294 | si_code = SEGV_MAPERR; | |
295 | address = current_thread_info()->fault_address; | |
296 | ||
297 | if ((fault_code & FAULT_CODE_ITLB) && | |
298 | (fault_code & FAULT_CODE_DTLB)) | |
299 | BUG(); | |
300 | ||
eeabac73 | 301 | if (test_thread_flag(TIF_32BIT)) { |
9b026058 DM |
302 | if (!(regs->tstate & TSTATE_PRIV)) { |
303 | if (unlikely((regs->tpc >> 32) != 0)) { | |
304 | bogus_32bit_fault_tpc(regs); | |
305 | goto intr_or_no_mm; | |
306 | } | |
307 | } | |
e5c460f4 | 308 | if (unlikely((address >> 32) != 0)) |
9b026058 | 309 | goto intr_or_no_mm; |
eeabac73 DM |
310 | } |
311 | ||
1da177e4 | 312 | if (regs->tstate & TSTATE_PRIV) { |
9b026058 | 313 | unsigned long tpc = regs->tpc; |
1da177e4 LT |
314 | |
315 | /* Sanity check the PC. */ | |
be71716e | 316 | if ((tpc >= KERNBASE && tpc < (unsigned long) __init_end) || |
1da177e4 LT |
317 | (tpc >= MODULES_VADDR && tpc < MODULES_END)) { |
318 | /* Valid, no problems... */ | |
319 | } else { | |
bf941d6c | 320 | bad_kernel_pc(regs, address); |
812cb83a | 321 | goto exit_exception; |
1da177e4 | 322 | } |
759496ba JW |
323 | } else |
324 | flags |= FAULT_FLAG_USER; | |
1da177e4 LT |
325 | |
326 | /* | |
327 | * If we're in an interrupt or have no user | |
328 | * context, we must not take the fault.. | |
329 | */ | |
70ffdb93 | 330 | if (faulthandler_disabled() || !mm) |
1da177e4 LT |
331 | goto intr_or_no_mm; |
332 | ||
a8b0ca17 | 333 | perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); |
a084b667 | 334 | |
1da177e4 LT |
335 | if (!down_read_trylock(&mm->mmap_sem)) { |
336 | if ((regs->tstate & TSTATE_PRIV) && | |
337 | !search_exception_tables(regs->tpc)) { | |
338 | insn = get_fault_insn(regs, insn); | |
339 | goto handle_kernel_fault; | |
340 | } | |
7358e510 KC |
341 | |
342 | retry: | |
1da177e4 LT |
343 | down_read(&mm->mmap_sem); |
344 | } | |
345 | ||
4ccb9272 | 346 | if (fault_code & FAULT_CODE_BAD_RA) |
347 | goto do_sigbus; | |
348 | ||
1da177e4 LT |
349 | vma = find_vma(mm, address); |
350 | if (!vma) | |
351 | goto bad_area; | |
352 | ||
353 | /* Pure DTLB misses do not tell us whether the fault causing | |
354 | * load/store/atomic was a write or not, it only says that there | |
355 | * was no match. So in such a case we (carefully) read the | |
356 | * instruction to try and figure this out. It's an optimization | |
357 | * so it's ok if we can't do this. | |
358 | * | |
359 | * Special hack, window spill/fill knows the exact fault type. | |
360 | */ | |
361 | if (((fault_code & | |
362 | (FAULT_CODE_DTLB | FAULT_CODE_WRITE | FAULT_CODE_WINFIXUP)) == FAULT_CODE_DTLB) && | |
363 | (vma->vm_flags & VM_WRITE) != 0) { | |
364 | insn = get_fault_insn(regs, 0); | |
365 | if (!insn) | |
366 | goto continue_fault; | |
73c50a27 DM |
367 | /* All loads, stores and atomics have bits 30 and 31 both set |
368 | * in the instruction. Bit 21 is set in all stores, but we | |
369 | * have to avoid prefetches which also have bit 21 set. | |
370 | */ | |
1da177e4 | 371 | if ((insn & 0xc0200000) == 0xc0200000 && |
73c50a27 | 372 | (insn & 0x01780000) != 0x01680000) { |
1da177e4 LT |
373 | /* Don't bother updating thread struct value, |
374 | * because update_mmu_cache only cares which tlb | |
375 | * the access came from. | |
376 | */ | |
377 | fault_code |= FAULT_CODE_WRITE; | |
378 | } | |
379 | } | |
380 | continue_fault: | |
381 | ||
382 | if (vma->vm_start <= address) | |
383 | goto good_area; | |
384 | if (!(vma->vm_flags & VM_GROWSDOWN)) | |
385 | goto bad_area; | |
386 | if (!(fault_code & FAULT_CODE_WRITE)) { | |
387 | /* Non-faulting loads shouldn't expand stack. */ | |
388 | insn = get_fault_insn(regs, insn); | |
389 | if ((insn & 0xc0800000) == 0xc0800000) { | |
390 | unsigned char asi; | |
391 | ||
392 | if (insn & 0x2000) | |
393 | asi = (regs->tstate >> 24); | |
394 | else | |
395 | asi = (insn >> 5); | |
396 | if ((asi & 0xf2) == 0x82) | |
397 | goto bad_area; | |
398 | } | |
399 | } | |
400 | if (expand_stack(vma, address)) | |
401 | goto bad_area; | |
402 | /* | |
403 | * Ok, we have a good vm_area for this memory access, so | |
404 | * we can handle it.. | |
405 | */ | |
406 | good_area: | |
407 | si_code = SEGV_ACCERR; | |
408 | ||
409 | /* If we took a ITLB miss on a non-executable page, catch | |
410 | * that here. | |
411 | */ | |
412 | if ((fault_code & FAULT_CODE_ITLB) && !(vma->vm_flags & VM_EXEC)) { | |
2bf7c3ef DA |
413 | WARN(address != regs->tpc, |
414 | "address (%lx) != regs->tpc (%lx)\n", address, regs->tpc); | |
415 | WARN_ON(regs->tstate & TSTATE_PRIV); | |
1da177e4 LT |
416 | goto bad_area; |
417 | } | |
418 | ||
419 | if (fault_code & FAULT_CODE_WRITE) { | |
420 | if (!(vma->vm_flags & VM_WRITE)) | |
421 | goto bad_area; | |
422 | ||
423 | /* Spitfire has an icache which does not snoop | |
424 | * processor stores. Later processors do... | |
425 | */ | |
426 | if (tlb_type == spitfire && | |
427 | (vma->vm_flags & VM_EXEC) != 0 && | |
428 | vma->vm_file != NULL) | |
429 | set_thread_fault_code(fault_code | | |
430 | FAULT_CODE_BLKCOMMIT); | |
759496ba JW |
431 | |
432 | flags |= FAULT_FLAG_WRITE; | |
1da177e4 LT |
433 | } else { |
434 | /* Allow reads even for write-only mappings */ | |
435 | if (!(vma->vm_flags & (VM_READ | VM_EXEC))) | |
436 | goto bad_area; | |
437 | } | |
438 | ||
dcddffd4 | 439 | fault = handle_mm_fault(vma, address, flags); |
7358e510 KC |
440 | |
441 | if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) | |
812cb83a | 442 | goto exit_exception; |
7358e510 | 443 | |
83c54070 NP |
444 | if (unlikely(fault & VM_FAULT_ERROR)) { |
445 | if (fault & VM_FAULT_OOM) | |
446 | goto out_of_memory; | |
33692f27 LT |
447 | else if (fault & VM_FAULT_SIGSEGV) |
448 | goto bad_area; | |
83c54070 NP |
449 | else if (fault & VM_FAULT_SIGBUS) |
450 | goto do_sigbus; | |
1da177e4 LT |
451 | BUG(); |
452 | } | |
7358e510 KC |
453 | |
454 | if (flags & FAULT_FLAG_ALLOW_RETRY) { | |
455 | if (fault & VM_FAULT_MAJOR) { | |
456 | current->maj_flt++; | |
457 | perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, | |
458 | 1, regs, address); | |
459 | } else { | |
460 | current->min_flt++; | |
461 | perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, | |
462 | 1, regs, address); | |
463 | } | |
464 | if (fault & VM_FAULT_RETRY) { | |
465 | flags &= ~FAULT_FLAG_ALLOW_RETRY; | |
45cac65b | 466 | flags |= FAULT_FLAG_TRIED; |
7358e510 KC |
467 | |
468 | /* No need to up_read(&mm->mmap_sem) as we would | |
469 | * have already released it in __lock_page_or_retry | |
470 | * in mm/filemap.c. | |
471 | */ | |
472 | ||
473 | goto retry; | |
474 | } | |
a084b667 | 475 | } |
1da177e4 | 476 | up_read(&mm->mmap_sem); |
7a1ac526 DM |
477 | |
478 | mm_rss = get_mm_rss(mm); | |
af1b1a9b MK |
479 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) |
480 | mm_rss -= (mm->context.thp_pte_count * (HPAGE_SIZE / PAGE_SIZE)); | |
dcc1e8dd | 481 | #endif |
7bebd83d | 482 | if (unlikely(mm_rss > |
dcc1e8dd DM |
483 | mm->context.tsb_block[MM_TSB_BASE].tsb_rss_limit)) |
484 | tsb_grow(mm, MM_TSB_BASE, mm_rss); | |
9e695d2e | 485 | #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE) |
af1b1a9b | 486 | mm_rss = mm->context.hugetlb_pte_count + mm->context.thp_pte_count; |
1e953d84 | 487 | mm_rss *= REAL_HPAGE_PER_HPAGE; |
7bebd83d | 488 | if (unlikely(mm_rss > |
0fbebed6 DM |
489 | mm->context.tsb_block[MM_TSB_HUGE].tsb_rss_limit)) { |
490 | if (mm->context.tsb_block[MM_TSB_HUGE].tsb) | |
491 | tsb_grow(mm, MM_TSB_HUGE, mm_rss); | |
492 | else | |
493 | hugetlb_setup(regs); | |
494 | ||
495 | } | |
dcc1e8dd | 496 | #endif |
812cb83a KT |
497 | exit_exception: |
498 | exception_exit(prev_state); | |
efdc1e20 | 499 | return; |
1da177e4 LT |
500 | |
501 | /* | |
502 | * Something tried to access memory that isn't in our memory map.. | |
503 | * Fix it, but check if it's kernel or user first.. | |
504 | */ | |
505 | bad_area: | |
506 | insn = get_fault_insn(regs, insn); | |
507 | up_read(&mm->mmap_sem); | |
508 | ||
509 | handle_kernel_fault: | |
510 | do_kernel_fault(regs, si_code, fault_code, insn, address); | |
812cb83a | 511 | goto exit_exception; |
1da177e4 LT |
512 | |
513 | /* | |
514 | * We ran out of memory, or some other thing happened to us that made | |
515 | * us unable to handle the page fault gracefully. | |
516 | */ | |
517 | out_of_memory: | |
518 | insn = get_fault_insn(regs, insn); | |
519 | up_read(&mm->mmap_sem); | |
a923c28f DM |
520 | if (!(regs->tstate & TSTATE_PRIV)) { |
521 | pagefault_out_of_memory(); | |
812cb83a | 522 | goto exit_exception; |
a923c28f | 523 | } |
1da177e4 LT |
524 | goto handle_kernel_fault; |
525 | ||
526 | intr_or_no_mm: | |
527 | insn = get_fault_insn(regs, 0); | |
528 | goto handle_kernel_fault; | |
529 | ||
530 | do_sigbus: | |
531 | insn = get_fault_insn(regs, insn); | |
532 | up_read(&mm->mmap_sem); | |
533 | ||
534 | /* | |
535 | * Send a sigbus, regardless of whether we were in kernel | |
536 | * or user mode. | |
537 | */ | |
70ffc6eb | 538 | do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, address, insn, fault_code); |
1da177e4 LT |
539 | |
540 | /* Kernel mode? Handle exceptions or die */ | |
541 | if (regs->tstate & TSTATE_PRIV) | |
542 | goto handle_kernel_fault; | |
1da177e4 | 543 | } |