patch-2.4.10 linux/arch/mips64/sgi-ip32/ip32-berr.c
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- Lines: 98
- Date:
Sun Sep 9 10:43:02 2001
- Orig file:
v2.4.9/linux/arch/mips64/sgi-ip32/ip32-berr.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/arch/mips64/sgi-ip32/ip32-berr.c linux/arch/mips64/sgi-ip32/ip32-berr.c
@@ -0,0 +1,97 @@
+/*
+ * 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>
+
+/* XXX I have no idea what this does --kmw */
+
+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
+ O2, so this here is needed to make the kernel link. */
+ get_dbe(dummy, (int *)KSEG0);
+}
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