// SPDX-License-Identifier: GPL-2.0

  /*
   *  linux/arch/h8300/mm/fault.c
   *
   *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
   *  Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
   *
   *  Based on:
   *
   *  linux/arch/m68knommu/mm/fault.c
   *  linux/arch/m68k/mm/fault.c
   *
   *  Copyright (C) 1995  Hamish Macdonald
   */
  
  #include <linux/mman.h>
  #include <linux/mm.h>
  #include <linux/kernel.h>
  #include <linux/ptrace.h>

  
  void die(const char *str, struct pt_regs *fp, unsigned long err);
  
  /*
   * This routine handles page faults.  It determines the problem, and
   * then passes it off to one of the appropriate routines.
   *
   * error_code:
   *	bit 0 == 0 means no page found, 1 means protection fault
   *	bit 1 == 0 means read, 1 means write
   *
   * If this routine detects a bad access, it returns 1, otherwise it
   * returns 0.
   */
  asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
  			      unsigned long error_code)
  {
  #ifdef DEBUG
  	pr_debug("regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld
  ",
  		 regs->sr, regs->pc, address, error_code);
  #endif
  
  /*
   * Oops. The kernel tried to access some bad page. We'll have to
   * terminate things with extreme prejudice.
   */
  	if ((unsigned long) address < PAGE_SIZE)
  		pr_alert("Unable to handle kernel NULL pointer dereference");
  	else
  		pr_alert("Unable to handle kernel access");
  	printk(" at virtual address %08lx
  ", address);
  	if (!user_mode(regs))
  		die("Oops", regs, error_code);
  	do_exit(SIGKILL);
  
  	return 1;
  }