fault.c (2383050f6a3a2e00636eabfcf66445af653ddd80) fault.c (2dd0e8d2d2a157dbc83295a78336c2217110f2f8)
1/*
2 * Based on arch/arm/mm/fault.c
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 1995-2004 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 *
8 * This program is free software; you can redistribute it and/or modify

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36#include <asm/esr.h>
37#include <asm/sysreg.h>
38#include <asm/system_misc.h>
39#include <asm/pgtable.h>
40#include <asm/tlbflush.h>
41
42static const char *fault_name(unsigned int esr);
43
1/*
2 * Based on arch/arm/mm/fault.c
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 1995-2004 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 *
8 * This program is free software; you can redistribute it and/or modify

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36#include <asm/esr.h>
37#include <asm/sysreg.h>
38#include <asm/system_misc.h>
39#include <asm/pgtable.h>
40#include <asm/tlbflush.h>
41
42static const char *fault_name(unsigned int esr);
43
44#ifdef CONFIG_KPROBES
45static inline int notify_page_fault(struct pt_regs *regs, unsigned int esr)
46{
47 int ret = 0;
48
49 /* kprobe_running() needs smp_processor_id() */
50 if (!user_mode(regs)) {
51 preempt_disable();
52 if (kprobe_running() && kprobe_fault_handler(regs, esr))
53 ret = 1;
54 preempt_enable();
55 }
56
57 return ret;
58}
59#else
60static inline int notify_page_fault(struct pt_regs *regs, unsigned int esr)
61{
62 return 0;
63}
64#endif
65
44/*
45 * Dump out the page tables associated with 'addr' in mm 'mm'.
46 */
47void show_pte(struct mm_struct *mm, unsigned long addr)
48{
49 pgd_t *pgd;
50
51 if (!mm)

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254 struct pt_regs *regs)
255{
256 struct task_struct *tsk;
257 struct mm_struct *mm;
258 int fault, sig, code;
259 unsigned long vm_flags = VM_READ | VM_WRITE | VM_EXEC;
260 unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
261
66/*
67 * Dump out the page tables associated with 'addr' in mm 'mm'.
68 */
69void show_pte(struct mm_struct *mm, unsigned long addr)
70{
71 pgd_t *pgd;
72
73 if (!mm)

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276 struct pt_regs *regs)
277{
278 struct task_struct *tsk;
279 struct mm_struct *mm;
280 int fault, sig, code;
281 unsigned long vm_flags = VM_READ | VM_WRITE | VM_EXEC;
282 unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
283
284 if (notify_page_fault(regs, esr))
285 return 0;
286
262 tsk = current;
263 mm = tsk->mm;
264
265 /*
266 * If we're in an interrupt or have no user context, we must not take
267 * the fault.
268 */
269 if (faulthandler_disabled() || !mm)

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624 rv = 0;
625 }
626
627 if (interrupts_enabled(regs))
628 trace_hardirqs_on();
629
630 return rv;
631}
287 tsk = current;
288 mm = tsk->mm;
289
290 /*
291 * If we're in an interrupt or have no user context, we must not take
292 * the fault.
293 */
294 if (faulthandler_disabled() || !mm)

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649 rv = 0;
650 }
651
652 if (interrupts_enabled(regs))
653 trace_hardirqs_on();
654
655 return rv;
656}
657NOKPROBE_SYMBOL(do_debug_exception);
632
633#ifdef CONFIG_ARM64_PAN
634void cpu_enable_pan(void *__unused)
635{
636 config_sctlr_el1(SCTLR_EL1_SPAN, 0);
637}
638#endif /* CONFIG_ARM64_PAN */
639

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659#ifdef CONFIG_ARM64_PAN
660void cpu_enable_pan(void *__unused)
661{
662 config_sctlr_el1(SCTLR_EL1_SPAN, 0);
663}
664#endif /* CONFIG_ARM64_PAN */
665

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