patch-2.3.48 linux/arch/mips64/sgi-ip22/ip22-berr.c

• Lines: 97
• Date: Thu Feb 24 22:53:35 2000
• Orig file: v2.3.47/linux/arch/mips64/sgi-ip22/ip22-berr.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.47/linux/arch/mips64/sgi-ip22/ip22-berr.c linux/arch/mips64/sgi-ip22/ip22-berr.c
@@ -0,0 +1,96 @@
+/* $Id: ip22-berr.c,v 1.2 2000/02/24 00:12:41 ralf Exp $
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle
+ * Copyright (C) 1999, 2000 by Silicon Graphics
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/uaccess.h>
+#include <asm/paccess.h>
+#include <asm/addrspace.h>
+#include <asm/ptrace.h>
+
+extern asmlinkage void handle_ibe(void);
+extern asmlinkage void handle_dbe(void);
+
+extern const struct exception_table_entry __start___dbe_table[];
+extern const struct exception_table_entry __stop___dbe_table[];
+
+static inline unsigned long
+search_one_table(const struct exception_table_entry *first,
+                 const struct exception_table_entry *last,
+                 unsigned long value)
+{
+	while (first <= last) {
+		const struct exception_table_entry *mid;
+		long diff;
+
+		mid = (last - first) / 2 + first;
+		diff = mid->insn - value;
+		if (diff == 0)
+			return mid->nextinsn;
+		else if (diff < 0)
+			first = mid+1;
+		else
+			last = mid-1;
+	}
+	return 0;
+}
+
+static inline unsigned long
+search_dbe_table(unsigned long addr)
+{
+	unsigned long ret;
+
+	/* There is only the kernel to search.  */
+	ret = search_one_table(__start___dbe_table, __stop___dbe_table-1, addr);
+	if (ret) return ret;
+
+	return 0;
+}
+
+void do_ibe(struct pt_regs *regs)
+{
+	printk("Got ibe at 0x%lx\n", regs->cp0_epc);
+	show_regs(regs);
+	dump_tlb_addr(regs->cp0_epc);
+	force_sig(SIGBUS, current);
+	while(1);
+}
+
+void do_dbe(struct pt_regs *regs)
+{
+	unsigned long fixup;
+
+	fixup = search_dbe_table(regs->cp0_epc);
+	if (fixup) {
+		long new_epc;
+
+		new_epc = fixup_exception(dpf_reg, fixup, regs->cp0_epc);
+		regs->cp0_epc = new_epc;
+		return;
+	}
+
+	printk("Got dbe at 0x%lx\n", regs->cp0_epc);
+	show_regs(regs);
+	dump_tlb_all();
+	while(1);
+	force_sig(SIGBUS, current);
+}
+
+void __init
+bus_error_init(void)
+{
+	int dummy;
+
+	set_except_vector(6, handle_ibe);
+	set_except_vector(7, handle_dbe);
+
+	/* At this time nothing uses the DBE protection mechanism on the
+	   Indy, so this here is needed to make the kernel link.  */
+	get_dbe(dummy, (int *)KSEG0);
+}