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81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
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/*
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* arch/ubicom32/mm/fault.c
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* Ubicom32 architecture page fault implementation.
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*
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* (C) Copyright 2009, Ubicom, Inc.
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* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
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* Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
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*
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* Based on:
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*
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* linux/arch/m68k/mm/fault.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* This file is part of the Ubicom32 Linux Kernel Port.
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*
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* The Ubicom32 Linux Kernel Port is free software: you can redistribute
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* it and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Ubicom32 Linux Kernel Port is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Ubicom32 Linux Kernel Port. If not,
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* see <http://www.gnu.org/licenses/>.
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*
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* Ubicom32 implementation derived from (with many thanks):
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* arch/m68knommu
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* arch/blackfin
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* arch/parisc
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*/
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#include <linux/module.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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extern void die_if_kernel(char *, struct pt_regs *, long);
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/*
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* This routine handles page faults. It determines the problem, and
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* then passes it off to one of the appropriate routines.
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*
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* error_code:
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* bit 0 == 0 means no page found, 1 means protection fault
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* bit 1 == 0 means read, 1 means write
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*
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* If this routine detects a bad access, it returns 1, otherwise it
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* returns 0.
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*/
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asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
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unsigned long error_code)
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{
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#ifdef DEBUG
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printk (KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
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regs->sr, regs->pc, address, error_code);
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#endif
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/*
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* Oops. The kernel tried to access some bad page. We'll have to
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* terminate things with extreme prejudice.
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*/
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if ((unsigned long) address < PAGE_SIZE) {
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printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
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} else
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printk(KERN_ALERT "Unable to handle kernel access");
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printk(KERN_ALERT " at virtual address %08lx\n",address);
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die_if_kernel("Oops", regs, error_code);
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do_exit(SIGKILL);
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return 1;
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}
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