1 /*
2 * linux/arch/arm/kernel/traps.c
3 *
4 * Copyright (C) 1995-2002 Russell King
5 * Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * 'traps.c' handles hardware exceptions after we have saved some state in
12 * 'linux/arch/arm/lib/traps.S'. Mostly a debugging aid, but will probably
13 * kill the offending process.
14 */
15 #include <linux/module.h>
16 #include <linux/signal.h>
17 #include <linux/spinlock.h>
18 #include <linux/personality.h>
19 #include <linux/kallsyms.h>
20 #include <linux/delay.h>
21 #include <linux/hardirq.h>
22 #include <linux/init.h>
23 #include <linux/uaccess.h>
24
25 #include <asm/atomic.h>
26 #include <asm/cacheflush.h>
27 #include <asm/system.h>
28 #include <asm/unistd.h>
29 #include <asm/traps.h>
30 #include <asm/unwind.h>
31
32 #include "ptrace.h"
33 #include "signal.h"
34
35 static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" };
36
37 #ifdef CONFIG_DEBUG_USER
38 unsigned int user_debug;
39
40 static int __init user_debug_setup(char *str)
41 {
42 get_option(&str, &user_debug);
43 return 1;
44 }
45 __setup("user_debug=", user_debug_setup);
46 #endif
47
48 static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
49
50 void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
51 {
52 #ifdef CONFIG_KALLSYMS
53 printk("[<%08lx>] ", where);
54 print_symbol("(%s) ", where);
55 printk("from [<%08lx>] ", from);
56 print_symbol("(%s)\n", from);
57 #else
58 printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
59 #endif
60
61 if (in_exception_text(where))
62 dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
63 }
64
65 #ifndef CONFIG_ARM_UNWIND
66 /*
67 * Stack pointers should always be within the kernels view of
68 * physical memory. If it is not there, then we can't dump
69 * out any information relating to the stack.
70 */
71 static int verify_stack(unsigned long sp)
72 {
73 if (sp < PAGE_OFFSET ||
74 (sp > (unsigned long)high_memory && high_memory != NULL))
75 return -EFAULT;
76
77 return 0;
78 }
79 #endif
80
81 /*
82 * Dump out the contents of some memory nicely...
83 */
84 static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
85 {
86 unsigned long p = bottom & ~31;
87 mm_segment_t fs;
88 int i;
89
90 /*
91 * We need to switch to kernel mode so that we can use __get_user
92 * to safely read from kernel space. Note that we now dump the
93 * code first, just in case the backtrace kills us.
94 */
95 fs = get_fs();
96 set_fs(KERNEL_DS);
97
98 printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
99
100 for (p = bottom & ~31; p < top;) {
101 printk("%04lx: ", p & 0xffff);
102
103 for (i = 0; i < 8; i++, p += 4) {
104 unsigned int val;
105
106 if (p < bottom || p >= top)
107 printk(" ");
108 else {
109 __get_user(val, (unsigned long *)p);
110 printk("%08x ", val);
111 }
112 }
113 printk ("\n");
114 }
115
116 set_fs(fs);
117 }
118
119 static void dump_instr(struct pt_regs *regs)
120 {
121 unsigned long addr = instruction_pointer(regs);
122 const int thumb = thumb_mode(regs);
123 const int width = thumb ? 4 : 8;
124 mm_segment_t fs;
125 int i;
126
127 /*
128 * We need to switch to kernel mode so that we can use __get_user
129 * to safely read from kernel space. Note that we now dump the
130 * code first, just in case the backtrace kills us.
131 */
132 fs = get_fs();
133 set_fs(KERNEL_DS);
134
135 printk("Code: ");
136 for (i = -4; i < 1; i++) {
137 unsigned int val, bad;
138
139 if (thumb)
140 bad = __get_user(val, &((u16 *)addr)[i]);
141 else
142 bad = __get_user(val, &((u32 *)addr)[i]);
143
144 if (!bad)
145 printk(i == 0 ? "(%0*x) " : "%0*x ", width, val);
146 else {
147 printk("bad PC value.");
148 break;
149 }
150 }
151 printk("\n");
152
153 set_fs(fs);
154 }
155
156 #ifdef CONFIG_ARM_UNWIND
157 static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
158 {
159 unwind_backtrace(regs, tsk);
160 }
161 #else
162 static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
163 {
164 unsigned int fp, mode;
165 int ok = 1;
166
167 printk("Backtrace: ");
168
169 if (!tsk)
170 tsk = current;
171
172 if (regs) {
173 fp = regs->ARM_fp;
174 mode = processor_mode(regs);
175 } else if (tsk != current) {
176 fp = thread_saved_fp(tsk);
177 mode = 0x10;
178 } else {
179 asm("mov %0, fp" : "=r" (fp) : : "cc");
180 mode = 0x10;
181 }
182
183 if (!fp) {
184 printk("no frame pointer");
185 ok = 0;
186 } else if (verify_stack(fp)) {
187 printk("invalid frame pointer 0x%08x", fp);
188 ok = 0;
189 } else if (fp < (unsigned long)end_of_stack(tsk))
190 printk("frame pointer underflow");
191 printk("\n");
192
193 if (ok)
194 c_backtrace(fp, mode);
195 }
196 #endif
197
198 void dump_stack(void)
199 {
200 dump_backtrace(NULL, NULL);
201 }
202
203 EXPORT_SYMBOL(dump_stack);
204
205 void show_stack(struct task_struct *tsk, unsigned long *sp)
206 {
207 dump_backtrace(NULL, tsk);
208 barrier();
209 }
210
211 #ifdef CONFIG_PREEMPT
212 #define S_PREEMPT " PREEMPT"
213 #else
214 #define S_PREEMPT ""
215 #endif
216 #ifdef CONFIG_SMP
217 #define S_SMP " SMP"
218 #else
219 #define S_SMP ""
220 #endif
221
222 static void __die(const char *str, int err, struct thread_info *thread, struct pt_regs *regs)
223 {
224 struct task_struct *tsk = thread->task;
225 static int die_counter;
226
227 printk("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
228 str, err, ++die_counter);
229 print_modules();
230 __show_regs(regs);
231 printk("Process %s (pid: %d, stack limit = 0x%p)\n",
232 tsk->comm, task_pid_nr(tsk), thread + 1);
233
234 if (!user_mode(regs) || in_interrupt()) {
235 dump_mem("Stack: ", regs->ARM_sp,
236 THREAD_SIZE + (unsigned long)task_stack_page(tsk));
237 dump_backtrace(regs, tsk);
238 dump_instr(regs);
239 }
240 }
241
242 DEFINE_SPINLOCK(die_lock);
243
244 /*
245 * This function is protected against re-entrancy.
246 */
247 NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
248 {
249 struct thread_info *thread = current_thread_info();
250
251 oops_enter();
252
253 console_verbose();
254 spin_lock_irq(&die_lock);
255 bust_spinlocks(1);
256 __die(str, err, thread, regs);
257 bust_spinlocks(0);
258 add_taint(TAINT_DIE);
259 spin_unlock_irq(&die_lock);
260
261 if (in_interrupt())
262 panic("Fatal exception in interrupt");
263
264 if (panic_on_oops)
265 panic("Fatal exception");
266
267 oops_exit();
268 do_exit(SIGSEGV);
269 }
270
271 void arm_notify_die(const char *str, struct pt_regs *regs,
272 struct siginfo *info, unsigned long err, unsigned long trap)
273 {
274 if (user_mode(regs)) {
275 current->thread.error_code = err;
276 current->thread.trap_no = trap;
277
278 force_sig_info(info->si_signo, info, current);
279 } else {
280 die(str, regs, err);
281 }
282 }
283
284 static LIST_HEAD(undef_hook);
285 static DEFINE_SPINLOCK(undef_lock);
286
287 void register_undef_hook(struct undef_hook *hook)
288 {
289 unsigned long flags;
290
291 spin_lock_irqsave(&undef_lock, flags);
292 list_add(&hook->node, &undef_hook);
293 spin_unlock_irqrestore(&undef_lock, flags);
294 }
295
296 void unregister_undef_hook(struct undef_hook *hook)
297 {
298 unsigned long flags;
299
300 spin_lock_irqsave(&undef_lock, flags);
301 list_del(&hook->node);
302 spin_unlock_irqrestore(&undef_lock, flags);
303 }
304
305 static int call_undef_hook(struct pt_regs *regs, unsigned int instr)
306 {
307 struct undef_hook *hook;
308 unsigned long flags;
309 int (*fn)(struct pt_regs *regs, unsigned int instr) = NULL;
310
311 spin_lock_irqsave(&undef_lock, flags);
312 list_for_each_entry(hook, &undef_hook, node)
313 if ((instr & hook->instr_mask) == hook->instr_val &&
314 (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val)
315 fn = hook->fn;
316 spin_unlock_irqrestore(&undef_lock, flags);
317
318 return fn ? fn(regs, instr) : 1;
319 }
320
321 asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
322 {
323 unsigned int correction = thumb_mode(regs) ? 2 : 4;
324 unsigned int instr;
325 siginfo_t info;
326 void __user *pc;
327
328 /*
329 * According to the ARM ARM, PC is 2 or 4 bytes ahead,
330 * depending whether we're in Thumb mode or not.
331 * Correct this offset.
332 */
333 regs->ARM_pc -= correction;
334
335 pc = (void __user *)instruction_pointer(regs);
336
337 if (processor_mode(regs) == SVC_MODE) {
338 instr = *(u32 *) pc;
339 } else if (thumb_mode(regs)) {
340 get_user(instr, (u16 __user *)pc);
341 } else {
342 get_user(instr, (u32 __user *)pc);
343 }
344
345 if (call_undef_hook(regs, instr) == 0)
346 return;
347
348 #ifdef CONFIG_DEBUG_USER
349 if (user_debug & UDBG_UNDEFINED) {
350 printk(KERN_INFO "%s (%d): undefined instruction: pc=%p\n",
351 current->comm, task_pid_nr(current), pc);
352 dump_instr(regs);
353 }
354 #endif
355
356 info.si_signo = SIGILL;
357 info.si_errno = 0;
358 info.si_code = ILL_ILLOPC;
359 info.si_addr = pc;
360
361 arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6);
362 }
363
364 asmlinkage void do_unexp_fiq (struct pt_regs *regs)
365 {
366 printk("Hmm. Unexpected FIQ received, but trying to continue\n");
367 printk("You may have a hardware problem...\n");
368 }
369
370 /*
371 * bad_mode handles the impossible case in the vectors. If you see one of
372 * these, then it's extremely serious, and could mean you have buggy hardware.
373 * It never returns, and never tries to sync. We hope that we can at least
374 * dump out some state information...
375 */
376 asmlinkage void bad_mode(struct pt_regs *regs, int reason)
377 {
378 console_verbose();
379
380 printk(KERN_CRIT "Bad mode in %s handler detected\n", handler[reason]);
381
382 die("Oops - bad mode", regs, 0);
383 local_irq_disable();
384 panic("bad mode");
385 }
386
387 static int bad_syscall(int n, struct pt_regs *regs)
388 {
389 struct thread_info *thread = current_thread_info();
390 siginfo_t info;
391
392 if (current->personality != PER_LINUX &&
393 current->personality != PER_LINUX_32BIT &&
394 thread->exec_domain->handler) {
395 thread->exec_domain->handler(n, regs);
396 return regs->ARM_r0;
397 }
398
399 #ifdef CONFIG_DEBUG_USER
400 if (user_debug & UDBG_SYSCALL) {
401 printk(KERN_ERR "[%d] %s: obsolete system call %08x.\n",
402 task_pid_nr(current), current->comm, n);
403 dump_instr(regs);
404 }
405 #endif
406
407 info.si_signo = SIGILL;
408 info.si_errno = 0;
409 info.si_code = ILL_ILLTRP;
410 info.si_addr = (void __user *)instruction_pointer(regs) -
411 (thumb_mode(regs) ? 2 : 4);
412
413 arm_notify_die("Oops - bad syscall", regs, &info, n, 0);
414
415 return regs->ARM_r0;
416 }
417
418 static inline void
419 do_cache_op(unsigned long start, unsigned long end, int flags)
420 {
421 struct vm_area_struct *vma;
422
423 if (end < start || flags)
424 return;
425
426 vma = find_vma(current->active_mm, start);
427 if (vma && vma->vm_start < end) {
428 if (start < vma->vm_start)
429 start = vma->vm_start;
430 if (end > vma->vm_end)
431 end = vma->vm_end;
432
433 flush_cache_user_range(vma, start, end);
434 }
435 }
436
437 /*
438 * Handle all unrecognised system calls.
439 * 0x9f0000 - 0x9fffff are some more esoteric system calls
440 */
441 #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
442 asmlinkage int arm_syscall(int no, struct pt_regs *regs)
443 {
444 struct thread_info *thread = current_thread_info();
445 siginfo_t info;
446
447 if ((no >> 16) != (__ARM_NR_BASE>> 16))
448 return bad_syscall(no, regs);
449
450 switch (no & 0xffff) {
451 case 0: /* branch through 0 */
452 info.si_signo = SIGSEGV;
453 info.si_errno = 0;
454 info.si_code = SEGV_MAPERR;
455 info.si_addr = NULL;
456
457 arm_notify_die("branch through zero", regs, &info, 0, 0);
458 return 0;
459
460 case NR(breakpoint): /* SWI BREAK_POINT */
461 regs->ARM_pc -= thumb_mode(regs) ? 2 : 4;
462 ptrace_break(current, regs);
463 return regs->ARM_r0;
464
465 /*
466 * Flush a region from virtual address 'r0' to virtual address 'r1'
467 * _exclusive_. There is no alignment requirement on either address;
468 * user space does not need to know the hardware cache layout.
469 *
470 * r2 contains flags. It should ALWAYS be passed as ZERO until it
471 * is defined to be something else. For now we ignore it, but may
472 * the fires of hell burn in your belly if you break this rule. ;)
473 *
474 * (at a later date, we may want to allow this call to not flush
475 * various aspects of the cache. Passing '' will guarantee that
476 * everything necessary gets flushed to maintain consistency in
477 * the specified region).
478 */
479 case NR(cacheflush):
480 do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);
481 return 0;
482
483 case NR(usr26):
484 if (!(elf_hwcap & HWCAP_26BIT))
485 break;
486 regs->ARM_cpsr &= ~MODE32_BIT;
487 return regs->ARM_r0;
488
489 case NR(usr32):
490 if (!(elf_hwcap & HWCAP_26BIT))
491 break;
492 regs->ARM_cpsr |= MODE32_BIT;
493 return regs->ARM_r0;
494
495 case NR(set_tls):
496 thread->tp_value = regs->ARM_r0;
497 #if defined(CONFIG_HAS_TLS_REG)
498 asm ("mcr p15, 0, %0, c13, c0, 3" : : "r" (regs->ARM_r0) );
499 #elif !defined(CONFIG_TLS_REG_EMUL)
500 /*
501 * User space must never try to access this directly.
502 * Expect your app to break eventually if you do so.
503 * The user helper at 0xffff0fe0 must be used instead.
504 * (see entry-armv.S for details)
505 */
506 *((unsigned int *)0xffff0ff0) = regs->ARM_r0;
507 #endif
508 return 0;
509
510 #ifdef CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG
511 /*
512 * Atomically store r1 in *r2 if *r2 is equal to r0 for user space.
513 * Return zero in r0 if *MEM was changed or non-zero if no exchange
514 * happened. Also set the user C flag accordingly.
515 * If access permissions have to be fixed up then non-zero is
516 * returned and the operation has to be re-attempted.
517 *
518 * *NOTE*: This is a ghost syscall private to the kernel. Only the
519 * __kuser_cmpxchg code in entry-armv.S should be aware of its
520 * existence. Don't ever use this from user code.
521 */
522 case 0xfff0:
523 for (;;) {
524 extern void do_DataAbort(unsigned long addr, unsigned int fsr,
525 struct pt_regs *regs);
526 unsigned long val;
527 unsigned long addr = regs->ARM_r2;
528 struct mm_struct *mm = current->mm;
529 pgd_t *pgd; pmd_t *pmd; pte_t *pte;
530 spinlock_t *ptl;
531
532 regs->ARM_cpsr &= ~PSR_C_BIT;
533 down_read(&mm->mmap_sem);
534 pgd = pgd_offset(mm, addr);
535 if (!pgd_present(*pgd))
536 goto bad_access;
537 pmd = pmd_offset(pgd, addr);
538 if (!pmd_present(*pmd))
539 goto bad_access;
540 pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
541 if (!pte_present(*pte) || !pte_dirty(*pte)) {
542 pte_unmap_unlock(pte, ptl);
543 goto bad_access;
544 }
545 val = *(unsigned long *)addr;
546 val -= regs->ARM_r0;
547 if (val == 0) {
548 *(unsigned long *)addr = regs->ARM_r1;
549 regs->ARM_cpsr |= PSR_C_BIT;
550 }
551 pte_unmap_unlock(pte, ptl);
552 up_read(&mm->mmap_sem);
553 return val;
554
555 bad_access:
556 up_read(&mm->mmap_sem);
557 /* simulate a write access fault */
558 do_DataAbort(addr, 15 + (1 << 11), regs);
559 }
560 #endif
561
562 default:
563 /* Calls 9f00xx..9f07ff are defined to return -ENOSYS
564 if not implemented, rather than raising SIGILL. This
565 way the calling program can gracefully determine whether
566 a feature is supported. */
567 if (no <= 0x7ff)
568 return -ENOSYS;
569 break;
570 }
571 #ifdef CONFIG_DEBUG_USER
572 /*
573 * experience shows that these seem to indicate that
574 * something catastrophic has happened
575 */
576 if (user_debug & UDBG_SYSCALL) {
577 printk("[%d] %s: arm syscall %d\n",
578 task_pid_nr(current), current->comm, no);
579 dump_instr(regs);
580 if (user_mode(regs)) {
581 __show_regs(regs);
582 c_backtrace(regs->ARM_fp, processor_mode(regs));
583 }
584 }
585 #endif
586 info.si_signo = SIGILL;
587 info.si_errno = 0;
588 info.si_code = ILL_ILLTRP;
589 info.si_addr = (void __user *)instruction_pointer(regs) -
590 (thumb_mode(regs) ? 2 : 4);
591
592 arm_notify_die("Oops - bad syscall(2)", regs, &info, no, 0);
593 return 0;
594 }
595
596 #ifdef CONFIG_TLS_REG_EMUL
597
598 /*
599 * We might be running on an ARMv6+ processor which should have the TLS
600 * register but for some reason we can't use it, or maybe an SMP system
601 * using a pre-ARMv6 processor (there are apparently a few prototypes like
602 * that in existence) and therefore access to that register must be
603 * emulated.
604 */
605
606 static int get_tp_trap(struct pt_regs *regs, unsigned int instr)
607 {
608 int reg = (instr >> 12) & 15;
609 if (reg == 15)
610 return 1;
611 regs->uregs[reg] = current_thread_info()->tp_value;
612 regs->ARM_pc += 4;
613 return 0;
614 }
615
616 static struct undef_hook arm_mrc_hook = {
617 .instr_mask = 0x0fff0fff,
618 .instr_val = 0x0e1d0f70,
619 .cpsr_mask = PSR_T_BIT,
620 .cpsr_val = 0,
621 .fn = get_tp_trap,
622 };
623
624 static int __init arm_mrc_hook_init(void)
625 {
626 register_undef_hook(&arm_mrc_hook);
627 return 0;
628 }
629
630 late_initcall(arm_mrc_hook_init);
631
632 #endif
633
634 void __bad_xchg(volatile void *ptr, int size)
635 {
636 printk("xchg: bad data size: pc 0x%p, ptr 0x%p, size %d\n",
637 __builtin_return_address(0), ptr, size);
638 BUG();
639 }
640 EXPORT_SYMBOL(__bad_xchg);
641
642 /*
643 * A data abort trap was taken, but we did not handle the instruction.
644 * Try to abort the user program, or panic if it was the kernel.
645 */
646 asmlinkage void
647 baddataabort(int code, unsigned long instr, struct pt_regs *regs)
648 {
649 unsigned long addr = instruction_pointer(regs);
650 siginfo_t info;
651
652 #ifdef CONFIG_DEBUG_USER
653 if (user_debug & UDBG_BADABORT) {
654 printk(KERN_ERR "[%d] %s: bad data abort: code %d instr 0x%08lx\n",
655 task_pid_nr(current), current->comm, code, instr);
656 dump_instr(regs);
657 show_pte(current->mm, addr);
658 }
659 #endif
660
661 info.si_signo = SIGILL;
662 info.si_errno = 0;
663 info.si_code = ILL_ILLOPC;
664 info.si_addr = (void __user *)addr;
665
666 arm_notify_die("unknown data abort code", regs, &info, instr, 0);
667 }
668
669 void __attribute__((noreturn)) __bug(const char *file, int line)
670 {
671 printk(KERN_CRIT"kernel BUG at %s:%d!\n", file, line);
672 *(int *)0 = 0;
673
674 /* Avoid "noreturn function does return" */
675 for (;;);
676 }
677 EXPORT_SYMBOL(__bug);
678
679 void __readwrite_bug(const char *fn)
680 {
681 printk("%s called, but not implemented\n", fn);
682 BUG();
683 }
684 EXPORT_SYMBOL(__readwrite_bug);
685
686 void __pte_error(const char *file, int line, unsigned long val)
687 {
688 printk("%s:%d: bad pte %08lx.\n", file, line, val);
689 }
690
691 void __pmd_error(const char *file, int line, unsigned long val)
692 {
693 printk("%s:%d: bad pmd %08lx.\n", file, line, val);
694 }
695
696 void __pgd_error(const char *file, int line, unsigned long val)
697 {
698 printk("%s:%d: bad pgd %08lx.\n", file, line, val);
699 }
700
701 asmlinkage void __div0(void)
702 {
703 printk("Division by zero in kernel.\n");
704 dump_stack();
705 }
706 EXPORT_SYMBOL(__div0);
707
708 void abort(void)
709 {
710 BUG();
711
712 /* if that doesn't kill us, halt */
713 panic("Oops failed to kill thread");
714 }
715 EXPORT_SYMBOL(abort);
716
717 void __init trap_init(void)
718 {
719 return;
720 }
721
722 void __init early_trap_init(void)
723 {
724 unsigned long vectors = CONFIG_VECTORS_BASE;
725 extern char __stubs_start[], __stubs_end[];
726 extern char __vectors_start[], __vectors_end[];
727 extern char __kuser_helper_start[], __kuser_helper_end[];
728 int kuser_sz = __kuser_helper_end - __kuser_helper_start;
729
730 /*
731 * Copy the vectors, stubs and kuser helpers (in entry-armv.S)
732 * into the vector page, mapped at 0xffff0000, and ensure these
733 * are visible to the instruction stream.
734 */
735 memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start);
736 memcpy((void *)vectors + 0x200, __stubs_start, __stubs_end - __stubs_start);
737 memcpy((void *)vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);
738
739 /*
740 * Copy signal return handlers into the vector page, and
741 * set sigreturn to be a pointer to these.
742 */
743 memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes,
744 sizeof(sigreturn_codes));
745
746 flush_icache_range(vectors, vectors + PAGE_SIZE);
747 modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
748 }
749
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