diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/mm/fault.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/mm/fault.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/mm/fault.c b/target/linux/ubicom32/files/arch/ubicom32/mm/fault.c new file mode 100644 index 000000000..ce6b1c760 --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/mm/fault.c @@ -0,0 +1,80 @@ +/* + * arch/ubicom32/mm/fault.c + * Ubicom32 architecture page fault implementation. + * + * (C) Copyright 2009, Ubicom, Inc. + * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, + * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) + * + * Based on: + * + * linux/arch/m68k/mm/fault.c + * + * Copyright (C) 1995 Hamish Macdonald + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port is free software: you can redistribute + * it and/or modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + */ + +#include <linux/module.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/kernel.h> +#include <linux/ptrace.h> + +#include <asm/system.h> +#include <asm/pgtable.h> + +extern void die_if_kernel(char *, struct pt_regs *, long); + +/* + * 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 + printk (KERN_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) { + printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference"); + } else + printk(KERN_ALERT "Unable to handle kernel access"); + printk(KERN_ALERT " at virtual address %08lx\n",address); + die_if_kernel("Oops", regs, error_code); + do_exit(SIGKILL); + + return 1; +} |