1 files changed, 45 insertions, 0 deletions
diff --git a/arch/x86/include/asm/extable.h b/arch/x86/include/asm/extable.h
new file mode 100644
index 000000000..1f0cbc529
--- /dev/null
+++ b/arch/x86/include/asm/extable.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_EXTABLE_H
+#define _ASM_X86_EXTABLE_H
+/*
+ * The exception table consists of triples of addresses relative to the
+ * exception table entry itself. The first address is of an instruction
+ * that is allowed to fault, the second is the target at which the program
+ * should continue. The third is a handler function to deal with the fault
+ * caused by the instruction in the first field.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry {
+	int insn, fixup, handler;
+};
+struct pt_regs;
+
+#define ARCH_HAS_RELATIVE_EXTABLE
+
+#define swap_ex_entry_fixup(a, b, tmp, delta)			\
+	do {							\
+		(a)->fixup = (b)->fixup + (delta);		\
+		(b)->fixup = (tmp).fixup - (delta);		\
+		(a)->handler = (b)->handler + (delta);		\
+		(b)->handler = (tmp).handler - (delta);		\
+	} while (0)
+
+enum handler_type {
+	EX_HANDLER_NONE,
+	EX_HANDLER_FAULT,
+	EX_HANDLER_UACCESS,
+	EX_HANDLER_OTHER
+};
+
+extern int fixup_exception(struct pt_regs *regs, int trapnr,
+			   unsigned long error_code, unsigned long fault_addr);
+extern int fixup_bug(struct pt_regs *regs, int trapnr);
+extern enum handler_type ex_get_fault_handler_type(unsigned long ip);
+extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
+
+#endif