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authorYoshinori Sato <ysato@users.sourceforge.jp>2015-01-28 02:47:36 +0900
committerYoshinori Sato <ysato@users.sourceforge.jp>2015-06-23 13:35:53 +0900
commitbbeb79acb3b44f727f6267e1f6db9b3fdf791c24 (patch)
tree630031609e4056c3d033d03c94d77af0a041adec /arch/h8300/mm/fault.c
parent4e0c20981ec16d13cfebaad7ed6245a472df2ed0 (diff)
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h8300: Memory management
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300/mm/fault.c')
-rw-r--r--arch/h8300/mm/fault.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/h8300/mm/fault.c b/arch/h8300/mm/fault.c
new file mode 100644
index 000000000000..5924ff555ded
--- /dev/null
+++ b/arch/h8300/mm/fault.c
@@ -0,0 +1,57 @@
+/*
+ * 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>
+
+#include <asm/pgtable.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;
+}