1/* 2 * linux/arch/m68knommu/mm/fault.c 3 * 4 * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, 5 * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) 6 * 7 * Based on: 8 * 9 * linux/arch/m68k/mm/fault.c 10 * 11 * Copyright (C) 1995 Hamish Macdonald 12 */ 13 14#include <linux/mman.h> 15#include <linux/mm.h> 16#include <linux/kernel.h> 17#include <linux/ptrace.h> 18 19#include <asm/system.h> 20#include <asm/pgtable.h> 21 22extern void die_if_kernel(char *, struct pt_regs *, long); 23 24/* 25 * This routine handles page faults. It determines the problem, and 26 * then passes it off to one of the appropriate routines. 27 * 28 * error_code: 29 * bit 0 == 0 means no page found, 1 means protection fault 30 * bit 1 == 0 means read, 1 means write 31 * 32 * If this routine detects a bad access, it returns 1, otherwise it 33 * returns 0. 34 */ 35asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address, 36 unsigned long error_code) 37{ 38#ifdef DEBUG 39 printk(KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n", 40 regs->sr, regs->pc, address, error_code); 41#endif 42 43 /* 44 * Oops. The kernel tried to access some bad page. We'll have to 45 * terminate things with extreme prejudice. 46 */ 47 if ((unsigned long) address < PAGE_SIZE) 48 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference"); 49 else 50 printk(KERN_ALERT "Unable to handle kernel access"); 51 printk(KERN_ALERT " at virtual address %08lx\n", address); 52 die_if_kernel("Oops", regs, error_code); 53 do_exit(SIGKILL); 54 55 return 1; 56} 57