// 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\n", 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\n", address); if (!user_mode(regs)) die("Oops", regs, error_code); do_exit(SIGKILL); return 1; }