[ubicom32]: move new files out from platform support patch

[openwrt/svn-archive/archive.git] / target / linux / ubicom32 / files / arch / ubicom32 / mm / fault.c

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 (file)
index 0000000..ce6b1c7
--- /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;
+}