2 * linux/arch/arm/kernel/traps.c
4 * Copyright (C) 1995-2009 Russell King
5 * Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds
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.
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.
15 #include <linux/signal.h>
16 #include <linux/personality.h>
17 #include <linux/kallsyms.h>
18 #include <linux/spinlock.h>
19 #include <linux/uaccess.h>
20 #include <linux/hardirq.h>
21 #include <linux/kdebug.h>
22 #include <linux/module.h>
23 #include <linux/kexec.h>
24 #include <linux/bug.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/sched.h>
29 #include <linux/atomic.h>
30 #include <asm/cacheflush.h>
31 #include <asm/exception.h>
32 #include <asm/unistd.h>
33 #include <asm/traps.h>
34 #include <asm/unwind.h>
36 #include <asm/system_misc.h>
37 #include <asm/opcodes.h>
39 static const char *handler
[]= {
44 "undefined instruction",
49 #ifdef CONFIG_DEBUG_USER
50 unsigned int user_debug
;
52 static int __init
user_debug_setup(char *str
)
54 get_option(&str
, &user_debug
);
57 __setup("user_debug=", user_debug_setup
);
60 static void dump_mem(const char *, const char *, unsigned long, unsigned long);
62 void dump_backtrace_entry(unsigned long where
, unsigned long from
, unsigned long frame
)
64 #ifdef CONFIG_KALLSYMS
65 printk("[<%08lx>] (%ps) from [<%08lx>] (%pS)\n", where
, (void *)where
, from
, (void *)from
);
67 printk("Function entered at [<%08lx>] from [<%08lx>]\n", where
, from
);
70 if (in_exception_text(where
))
71 dump_mem("", "Exception stack", frame
+ 4, frame
+ 4 + sizeof(struct pt_regs
));
74 #ifndef CONFIG_ARM_UNWIND
76 * Stack pointers should always be within the kernels view of
77 * physical memory. If it is not there, then we can't dump
78 * out any information relating to the stack.
80 static int verify_stack(unsigned long sp
)
82 if (sp
< PAGE_OFFSET
||
83 (sp
> (unsigned long)high_memory
&& high_memory
!= NULL
))
91 * Dump out the contents of some memory nicely...
93 static void dump_mem(const char *lvl
, const char *str
, unsigned long bottom
,
101 * We need to switch to kernel mode so that we can use __get_user
102 * to safely read from kernel space. Note that we now dump the
103 * code first, just in case the backtrace kills us.
108 printk("%s%s(0x%08lx to 0x%08lx)\n", lvl
, str
, bottom
, top
);
110 for (first
= bottom
& ~31; first
< top
; first
+= 32) {
112 char str
[sizeof(" 12345678") * 8 + 1];
114 memset(str
, ' ', sizeof(str
));
115 str
[sizeof(str
) - 1] = '\0';
117 for (p
= first
, i
= 0; i
< 8 && p
< top
; i
++, p
+= 4) {
118 if (p
>= bottom
&& p
< top
) {
120 if (__get_user(val
, (unsigned long *)p
) == 0)
121 sprintf(str
+ i
* 9, " %08lx", val
);
123 sprintf(str
+ i
* 9, " ????????");
126 printk("%s%04lx:%s\n", lvl
, first
& 0xffff, str
);
132 static void dump_instr(const char *lvl
, struct pt_regs
*regs
)
134 unsigned long addr
= instruction_pointer(regs
);
135 const int thumb
= thumb_mode(regs
);
136 const int width
= thumb
? 4 : 8;
138 char str
[sizeof("00000000 ") * 5 + 2 + 1], *p
= str
;
142 * We need to switch to kernel mode so that we can use __get_user
143 * to safely read from kernel space. Note that we now dump the
144 * code first, just in case the backtrace kills us.
149 for (i
= -4; i
< 1 + !!thumb
; i
++) {
150 unsigned int val
, bad
;
153 bad
= __get_user(val
, &((u16
*)addr
)[i
]);
155 bad
= __get_user(val
, &((u32
*)addr
)[i
]);
158 p
+= sprintf(p
, i
== 0 ? "(%0*x) " : "%0*x ",
161 p
+= sprintf(p
, "bad PC value");
165 printk("%sCode: %s\n", lvl
, str
);
170 #ifdef CONFIG_ARM_UNWIND
171 static inline void dump_backtrace(struct pt_regs
*regs
, struct task_struct
*tsk
)
173 unwind_backtrace(regs
, tsk
);
176 static void dump_backtrace(struct pt_regs
*regs
, struct task_struct
*tsk
)
178 unsigned int fp
, mode
;
181 printk("Backtrace: ");
188 mode
= processor_mode(regs
);
189 } else if (tsk
!= current
) {
190 fp
= thread_saved_fp(tsk
);
193 asm("mov %0, fp" : "=r" (fp
) : : "cc");
198 printk("no frame pointer");
200 } else if (verify_stack(fp
)) {
201 printk("invalid frame pointer 0x%08x", fp
);
203 } else if (fp
< (unsigned long)end_of_stack(tsk
))
204 printk("frame pointer underflow");
208 c_backtrace(fp
, mode
);
212 void show_stack(struct task_struct
*tsk
, unsigned long *sp
)
214 dump_backtrace(NULL
, tsk
);
218 #ifdef CONFIG_PREEMPT
219 #define S_PREEMPT " PREEMPT"
228 #ifdef CONFIG_THUMB2_KERNEL
229 #define S_ISA " THUMB2"
234 static int __die(const char *str
, int err
, struct pt_regs
*regs
)
236 struct task_struct
*tsk
= current
;
237 static int die_counter
;
240 printk(KERN_EMERG
"Internal error: %s: %x [#%d]" S_PREEMPT S_SMP
241 S_ISA
"\n", str
, err
, ++die_counter
);
243 /* trap and error numbers are mostly meaningless on ARM */
244 ret
= notify_die(DIE_OOPS
, str
, regs
, err
, tsk
->thread
.trap_no
, SIGSEGV
);
245 if (ret
== NOTIFY_STOP
)
250 printk(KERN_EMERG
"Process %.*s (pid: %d, stack limit = 0x%p)\n",
251 TASK_COMM_LEN
, tsk
->comm
, task_pid_nr(tsk
), end_of_stack(tsk
));
253 if (!user_mode(regs
) || in_interrupt()) {
254 dump_mem(KERN_EMERG
, "Stack: ", regs
->ARM_sp
,
255 THREAD_SIZE
+ (unsigned long)task_stack_page(tsk
));
256 dump_backtrace(regs
, tsk
);
257 dump_instr(KERN_EMERG
, regs
);
263 static arch_spinlock_t die_lock
= __ARCH_SPIN_LOCK_UNLOCKED
;
264 static int die_owner
= -1;
265 static unsigned int die_nest_count
;
267 static unsigned long oops_begin(void)
274 /* racy, but better than risking deadlock. */
275 raw_local_irq_save(flags
);
276 cpu
= smp_processor_id();
277 if (!arch_spin_trylock(&die_lock
)) {
278 if (cpu
== die_owner
)
279 /* nested oops. should stop eventually */;
281 arch_spin_lock(&die_lock
);
290 static void oops_end(unsigned long flags
, struct pt_regs
*regs
, int signr
)
292 if (regs
&& kexec_should_crash(current
))
297 add_taint(TAINT_DIE
, LOCKDEP_NOW_UNRELIABLE
);
300 /* Nest count reaches zero, release the lock. */
301 arch_spin_unlock(&die_lock
);
302 raw_local_irq_restore(flags
);
306 panic("Fatal exception in interrupt");
308 panic("Fatal exception");
314 * This function is protected against re-entrancy.
316 void die(const char *str
, struct pt_regs
*regs
, int err
)
318 enum bug_trap_type bug_type
= BUG_TRAP_TYPE_NONE
;
319 unsigned long flags
= oops_begin();
322 if (!user_mode(regs
))
323 bug_type
= report_bug(regs
->ARM_pc
, regs
);
324 if (bug_type
!= BUG_TRAP_TYPE_NONE
)
327 if (__die(str
, err
, regs
))
330 oops_end(flags
, regs
, sig
);
333 void arm_notify_die(const char *str
, struct pt_regs
*regs
,
334 struct siginfo
*info
, unsigned long err
, unsigned long trap
)
336 if (user_mode(regs
)) {
337 current
->thread
.error_code
= err
;
338 current
->thread
.trap_no
= trap
;
340 force_sig_info(info
->si_signo
, info
, current
);
346 #ifdef CONFIG_GENERIC_BUG
348 int is_valid_bugaddr(unsigned long pc
)
350 #ifdef CONFIG_THUMB2_KERNEL
352 u16 insn
= __opcode_to_mem_thumb16(BUG_INSTR_VALUE
);
355 u32 insn
= __opcode_to_mem_arm(BUG_INSTR_VALUE
);
358 if (probe_kernel_address((unsigned *)pc
, bkpt
))
366 static LIST_HEAD(undef_hook
);
367 static DEFINE_RAW_SPINLOCK(undef_lock
);
369 void register_undef_hook(struct undef_hook
*hook
)
373 raw_spin_lock_irqsave(&undef_lock
, flags
);
374 list_add(&hook
->node
, &undef_hook
);
375 raw_spin_unlock_irqrestore(&undef_lock
, flags
);
378 void unregister_undef_hook(struct undef_hook
*hook
)
382 raw_spin_lock_irqsave(&undef_lock
, flags
);
383 list_del(&hook
->node
);
384 raw_spin_unlock_irqrestore(&undef_lock
, flags
);
387 static int call_undef_hook(struct pt_regs
*regs
, unsigned int instr
)
389 struct undef_hook
*hook
;
391 int (*fn
)(struct pt_regs
*regs
, unsigned int instr
) = NULL
;
393 raw_spin_lock_irqsave(&undef_lock
, flags
);
394 list_for_each_entry(hook
, &undef_hook
, node
)
395 if ((instr
& hook
->instr_mask
) == hook
->instr_val
&&
396 (regs
->ARM_cpsr
& hook
->cpsr_mask
) == hook
->cpsr_val
)
398 raw_spin_unlock_irqrestore(&undef_lock
, flags
);
400 return fn
? fn(regs
, instr
) : 1;
403 asmlinkage
void __exception
do_undefinstr(struct pt_regs
*regs
)
409 pc
= (void __user
*)instruction_pointer(regs
);
411 if (processor_mode(regs
) == SVC_MODE
) {
412 #ifdef CONFIG_THUMB2_KERNEL
413 if (thumb_mode(regs
)) {
414 instr
= __mem_to_opcode_thumb16(((u16
*)pc
)[0]);
415 if (is_wide_instruction(instr
)) {
417 inst2
= __mem_to_opcode_thumb16(((u16
*)pc
)[1]);
418 instr
= __opcode_thumb32_compose(instr
, inst2
);
422 instr
= __mem_to_opcode_arm(*(u32
*) pc
);
423 } else if (thumb_mode(regs
)) {
424 if (get_user(instr
, (u16 __user
*)pc
))
426 instr
= __mem_to_opcode_thumb16(instr
);
427 if (is_wide_instruction(instr
)) {
429 if (get_user(instr2
, (u16 __user
*)pc
+1))
431 instr2
= __mem_to_opcode_thumb16(instr2
);
432 instr
= __opcode_thumb32_compose(instr
, instr2
);
435 if (get_user(instr
, (u32 __user
*)pc
))
437 instr
= __mem_to_opcode_arm(instr
);
440 if (call_undef_hook(regs
, instr
) == 0)
444 #ifdef CONFIG_DEBUG_USER
445 if (user_debug
& UDBG_UNDEFINED
) {
446 printk(KERN_INFO
"%s (%d): undefined instruction: pc=%p\n",
447 current
->comm
, task_pid_nr(current
), pc
);
449 dump_instr(KERN_INFO
, regs
);
453 info
.si_signo
= SIGILL
;
455 info
.si_code
= ILL_ILLOPC
;
458 arm_notify_die("Oops - undefined instruction", regs
, &info
, 0, 6);
461 asmlinkage
void do_unexp_fiq (struct pt_regs
*regs
)
463 printk("Hmm. Unexpected FIQ received, but trying to continue\n");
464 printk("You may have a hardware problem...\n");
468 * bad_mode handles the impossible case in the vectors. If you see one of
469 * these, then it's extremely serious, and could mean you have buggy hardware.
470 * It never returns, and never tries to sync. We hope that we can at least
471 * dump out some state information...
473 asmlinkage
void bad_mode(struct pt_regs
*regs
, int reason
)
477 printk(KERN_CRIT
"Bad mode in %s handler detected\n", handler
[reason
]);
479 die("Oops - bad mode", regs
, 0);
484 static int bad_syscall(int n
, struct pt_regs
*regs
)
486 struct thread_info
*thread
= current_thread_info();
489 if ((current
->personality
& PER_MASK
) != PER_LINUX
&&
490 thread
->exec_domain
->handler
) {
491 thread
->exec_domain
->handler(n
, regs
);
495 #ifdef CONFIG_DEBUG_USER
496 if (user_debug
& UDBG_SYSCALL
) {
497 printk(KERN_ERR
"[%d] %s: obsolete system call %08x.\n",
498 task_pid_nr(current
), current
->comm
, n
);
499 dump_instr(KERN_ERR
, regs
);
503 info
.si_signo
= SIGILL
;
505 info
.si_code
= ILL_ILLTRP
;
506 info
.si_addr
= (void __user
*)instruction_pointer(regs
) -
507 (thumb_mode(regs
) ? 2 : 4);
509 arm_notify_die("Oops - bad syscall", regs
, &info
, n
, 0);
514 static long do_cache_op_restart(struct restart_block
*);
517 __do_cache_op(unsigned long start
, unsigned long end
)
522 unsigned long chunk
= min(PAGE_SIZE
, end
- start
);
524 if (signal_pending(current
)) {
525 struct thread_info
*ti
= current_thread_info();
527 ti
->restart_block
= (struct restart_block
) {
528 .fn
= do_cache_op_restart
,
531 ti
->arm_restart_block
= (struct arm_restart_block
) {
540 return -ERESTART_RESTARTBLOCK
;
543 ret
= flush_cache_user_range(start
, start
+ chunk
);
549 } while (start
< end
);
554 static long do_cache_op_restart(struct restart_block
*unused
)
556 struct arm_restart_block
*restart_block
;
558 restart_block
= ¤t_thread_info()->arm_restart_block
;
559 return __do_cache_op(restart_block
->cache
.start
,
560 restart_block
->cache
.end
);
564 do_cache_op(unsigned long start
, unsigned long end
, int flags
)
566 if (end
< start
|| flags
)
569 if (!access_ok(VERIFY_READ
, start
, end
- start
))
572 return __do_cache_op(start
, end
);
576 * Handle all unrecognised system calls.
577 * 0x9f0000 - 0x9fffff are some more esoteric system calls
579 #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
580 asmlinkage
int arm_syscall(int no
, struct pt_regs
*regs
)
582 struct thread_info
*thread
= current_thread_info();
585 if ((no
>> 16) != (__ARM_NR_BASE
>> 16))
586 return bad_syscall(no
, regs
);
588 switch (no
& 0xffff) {
589 case 0: /* branch through 0 */
590 info
.si_signo
= SIGSEGV
;
592 info
.si_code
= SEGV_MAPERR
;
595 arm_notify_die("branch through zero", regs
, &info
, 0, 0);
598 case NR(breakpoint
): /* SWI BREAK_POINT */
599 regs
->ARM_pc
-= thumb_mode(regs
) ? 2 : 4;
600 ptrace_break(current
, regs
);
604 * Flush a region from virtual address 'r0' to virtual address 'r1'
605 * _exclusive_. There is no alignment requirement on either address;
606 * user space does not need to know the hardware cache layout.
608 * r2 contains flags. It should ALWAYS be passed as ZERO until it
609 * is defined to be something else. For now we ignore it, but may
610 * the fires of hell burn in your belly if you break this rule. ;)
612 * (at a later date, we may want to allow this call to not flush
613 * various aspects of the cache. Passing '0' will guarantee that
614 * everything necessary gets flushed to maintain consistency in
615 * the specified region).
618 return do_cache_op(regs
->ARM_r0
, regs
->ARM_r1
, regs
->ARM_r2
);
621 if (!(elf_hwcap
& HWCAP_26BIT
))
623 regs
->ARM_cpsr
&= ~MODE32_BIT
;
627 if (!(elf_hwcap
& HWCAP_26BIT
))
629 regs
->ARM_cpsr
|= MODE32_BIT
;
633 thread
->tp_value
[0] = regs
->ARM_r0
;
637 asm ("mcr p15, 0, %0, c13, c0, 3"
638 : : "r" (regs
->ARM_r0
));
641 * User space must never try to access this directly.
642 * Expect your app to break eventually if you do so.
643 * The user helper at 0xffff0fe0 must be used instead.
644 * (see entry-armv.S for details)
646 *((unsigned int *)0xffff0ff0) = regs
->ARM_r0
;
650 #ifdef CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG
652 * Atomically store r1 in *r2 if *r2 is equal to r0 for user space.
653 * Return zero in r0 if *MEM was changed or non-zero if no exchange
654 * happened. Also set the user C flag accordingly.
655 * If access permissions have to be fixed up then non-zero is
656 * returned and the operation has to be re-attempted.
658 * *NOTE*: This is a ghost syscall private to the kernel. Only the
659 * __kuser_cmpxchg code in entry-armv.S should be aware of its
660 * existence. Don't ever use this from user code.
664 extern void do_DataAbort(unsigned long addr
, unsigned int fsr
,
665 struct pt_regs
*regs
);
667 unsigned long addr
= regs
->ARM_r2
;
668 struct mm_struct
*mm
= current
->mm
;
669 pgd_t
*pgd
; pmd_t
*pmd
; pte_t
*pte
;
672 regs
->ARM_cpsr
&= ~PSR_C_BIT
;
673 down_read(&mm
->mmap_sem
);
674 pgd
= pgd_offset(mm
, addr
);
675 if (!pgd_present(*pgd
))
677 pmd
= pmd_offset(pgd
, addr
);
678 if (!pmd_present(*pmd
))
680 pte
= pte_offset_map_lock(mm
, pmd
, addr
, &ptl
);
681 if (!pte_present(*pte
) || !pte_write(*pte
) || !pte_dirty(*pte
)) {
682 pte_unmap_unlock(pte
, ptl
);
685 val
= *(unsigned long *)addr
;
688 *(unsigned long *)addr
= regs
->ARM_r1
;
689 regs
->ARM_cpsr
|= PSR_C_BIT
;
691 pte_unmap_unlock(pte
, ptl
);
692 up_read(&mm
->mmap_sem
);
696 up_read(&mm
->mmap_sem
);
697 /* simulate a write access fault */
698 do_DataAbort(addr
, 15 + (1 << 11), regs
);
703 /* Calls 9f00xx..9f07ff are defined to return -ENOSYS
704 if not implemented, rather than raising SIGILL. This
705 way the calling program can gracefully determine whether
706 a feature is supported. */
707 if ((no
& 0xffff) <= 0x7ff)
711 #ifdef CONFIG_DEBUG_USER
713 * experience shows that these seem to indicate that
714 * something catastrophic has happened
716 if (user_debug
& UDBG_SYSCALL
) {
717 printk("[%d] %s: arm syscall %d\n",
718 task_pid_nr(current
), current
->comm
, no
);
719 dump_instr("", regs
);
720 if (user_mode(regs
)) {
722 c_backtrace(regs
->ARM_fp
, processor_mode(regs
));
726 info
.si_signo
= SIGILL
;
728 info
.si_code
= ILL_ILLTRP
;
729 info
.si_addr
= (void __user
*)instruction_pointer(regs
) -
730 (thumb_mode(regs
) ? 2 : 4);
732 arm_notify_die("Oops - bad syscall(2)", regs
, &info
, no
, 0);
736 #ifdef CONFIG_TLS_REG_EMUL
739 * We might be running on an ARMv6+ processor which should have the TLS
740 * register but for some reason we can't use it, or maybe an SMP system
741 * using a pre-ARMv6 processor (there are apparently a few prototypes like
742 * that in existence) and therefore access to that register must be
746 static int get_tp_trap(struct pt_regs
*regs
, unsigned int instr
)
748 int reg
= (instr
>> 12) & 15;
751 regs
->uregs
[reg
] = current_thread_info()->tp_value
[0];
756 static struct undef_hook arm_mrc_hook
= {
757 .instr_mask
= 0x0fff0fff,
758 .instr_val
= 0x0e1d0f70,
759 .cpsr_mask
= PSR_T_BIT
,
764 static int __init
arm_mrc_hook_init(void)
766 register_undef_hook(&arm_mrc_hook
);
770 late_initcall(arm_mrc_hook_init
);
774 void __bad_xchg(volatile void *ptr
, int size
)
776 printk("xchg: bad data size: pc 0x%p, ptr 0x%p, size %d\n",
777 __builtin_return_address(0), ptr
, size
);
780 EXPORT_SYMBOL(__bad_xchg
);
783 * A data abort trap was taken, but we did not handle the instruction.
784 * Try to abort the user program, or panic if it was the kernel.
787 baddataabort(int code
, unsigned long instr
, struct pt_regs
*regs
)
789 unsigned long addr
= instruction_pointer(regs
);
792 #ifdef CONFIG_DEBUG_USER
793 if (user_debug
& UDBG_BADABORT
) {
794 printk(KERN_ERR
"[%d] %s: bad data abort: code %d instr 0x%08lx\n",
795 task_pid_nr(current
), current
->comm
, code
, instr
);
796 dump_instr(KERN_ERR
, regs
);
797 show_pte(current
->mm
, addr
);
801 info
.si_signo
= SIGILL
;
803 info
.si_code
= ILL_ILLOPC
;
804 info
.si_addr
= (void __user
*)addr
;
806 arm_notify_die("unknown data abort code", regs
, &info
, instr
, 0);
809 void __readwrite_bug(const char *fn
)
811 printk("%s called, but not implemented\n", fn
);
814 EXPORT_SYMBOL(__readwrite_bug
);
816 void __pte_error(const char *file
, int line
, pte_t pte
)
818 printk("%s:%d: bad pte %08llx.\n", file
, line
, (long long)pte_val(pte
));
821 void __pmd_error(const char *file
, int line
, pmd_t pmd
)
823 printk("%s:%d: bad pmd %08llx.\n", file
, line
, (long long)pmd_val(pmd
));
826 void __pgd_error(const char *file
, int line
, pgd_t pgd
)
828 printk("%s:%d: bad pgd %08llx.\n", file
, line
, (long long)pgd_val(pgd
));
831 asmlinkage
void __div0(void)
833 printk("Division by zero in kernel.\n");
836 EXPORT_SYMBOL(__div0
);
842 /* if that doesn't kill us, halt */
843 panic("Oops failed to kill thread");
845 EXPORT_SYMBOL(abort
);
847 void __init
trap_init(void)
852 #ifdef CONFIG_KUSER_HELPERS
853 static void __init
kuser_init(void *vectors
)
855 extern char __kuser_helper_start
[], __kuser_helper_end
[];
856 int kuser_sz
= __kuser_helper_end
- __kuser_helper_start
;
858 memcpy(vectors
+ 0x1000 - kuser_sz
, __kuser_helper_start
, kuser_sz
);
861 * vectors + 0xfe0 = __kuser_get_tls
862 * vectors + 0xfe8 = hardware TLS instruction at 0xffff0fe8
864 if (tls_emu
|| has_tls_reg
)
865 memcpy(vectors
+ 0xfe0, vectors
+ 0xfe8, 4);
868 static inline void __init
kuser_init(void *vectors
)
873 void __init
early_trap_init(void *vectors_base
)
875 #ifndef CONFIG_CPU_V7M
876 unsigned long vectors
= (unsigned long)vectors_base
;
877 extern char __stubs_start
[], __stubs_end
[];
878 extern char __vectors_start
[], __vectors_end
[];
881 vectors_page
= vectors_base
;
884 * Poison the vectors page with an undefined instruction. This
885 * instruction is chosen to be undefined for both ARM and Thumb
886 * ISAs. The Thumb version is an undefined instruction with a
887 * branch back to the undefined instruction.
889 for (i
= 0; i
< PAGE_SIZE
/ sizeof(u32
); i
++)
890 ((u32
*)vectors_base
)[i
] = 0xe7fddef1;
893 * Copy the vectors, stubs and kuser helpers (in entry-armv.S)
894 * into the vector page, mapped at 0xffff0000, and ensure these
895 * are visible to the instruction stream.
897 memcpy((void *)vectors
, __vectors_start
, __vectors_end
- __vectors_start
);
898 memcpy((void *)vectors
+ 0x1000, __stubs_start
, __stubs_end
- __stubs_start
);
900 kuser_init(vectors_base
);
902 flush_icache_range(vectors
, vectors
+ PAGE_SIZE
* 2);
903 modify_domain(DOMAIN_USER
, DOMAIN_CLIENT
);
904 #else /* ifndef CONFIG_CPU_V7M */
906 * on V7-M there is no need to copy the vector table to a dedicated
907 * memory area. The address is configurable and so a table in the kernel