/*
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/*
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* linux/arch/m68knommu/mm/fault.c
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* linux/arch/m68knommu/mm/fault.c
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*
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*
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* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
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* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
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* The Silver Hammer Group, Ltd.
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* The Silver Hammer Group, Ltd.
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*
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*
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* Based on:
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* Based on:
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*
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*
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* linux/arch/m68k/mm/fault.c
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* linux/arch/m68k/mm/fault.c
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*
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*
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* Copyright (C) 1995 Hamish Macdonald
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* Copyright (C) 1995 Hamish Macdonald
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*/
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*/
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#include <linux/mman.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <linux/ptrace.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <asm/pgtable.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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extern void die_if_kernel(char *, struct pt_regs *, long);
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/*
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/*
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* This routine handles page faults. It determines the problem, and
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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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* then passes it off to one of the appropriate routines.
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*
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*
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* error_code:
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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 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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* bit 1 == 0 means read, 1 means write
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*
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*
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* If this routine detects a bad access, it returns 1, otherwise it
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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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* returns 0.
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*/
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*/
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asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
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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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unsigned long error_code)
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{
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{
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#ifdef DEBUG
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#ifdef DEBUG
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printk("page fault!\n");
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printk("page fault!\n");
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show_regs(regs);
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show_regs(regs);
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#endif
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#endif
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/*
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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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* 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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* terminate things with extreme prejudice.
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*/
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*/
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if ((unsigned long) address < PAGE_SIZE) {
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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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printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
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} else
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} else
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printk(KERN_ALERT "Unable to handle kernel access");
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printk(KERN_ALERT "Unable to handle kernel access");
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printk(" at virtual address %08lx\n",address);
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printk(" at virtual address %08lx\n",address);
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die_if_kernel("Oops", regs, error_code);
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die_if_kernel("Oops", regs, error_code);
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do_exit(SIGKILL);
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do_exit(SIGKILL);
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return 1;
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return 1;
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}
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}
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