1 files changed, 61 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..eeed395c3
--- /dev/null
+++ b/arch/x86/include/asm/extable.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_EXTABLE_H
+#define _ASM_X86_EXTABLE_H
+
+#include <asm/extable_fixup_types.h>
+
+/*
+ * The exception table consists of two addresses relative to the
+ * exception table entry itself and a type selector field.
+ *
+ * The first address is of an instruction that is allowed to fault, the
+ * second is the target at which the program should continue.
+ *
+ * The type entry is used by fixup_exception() to select the handler 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, data;
+};
+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)->data = (b)->data;				\
+		(b)->data = (tmp).data;				\
+	} while (0)
+
+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 int ex_get_fixup_type(unsigned long ip);
+extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
+
+#ifdef CONFIG_X86_MCE
+extern void __noreturn ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr);
+#else
+static inline void __noreturn ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr)
+{
+	for (;;)
+		cpu_relax();
+}
+#endif
+
+#if defined(CONFIG_BPF_JIT) && defined(CONFIG_X86_64)
+bool ex_handler_bpf(const struct exception_table_entry *x, struct pt_regs *regs);
+#else
+static inline bool ex_handler_bpf(const struct exception_table_entry *x,
+				  struct pt_regs *regs) { return false; }
+#endif
+
+#endif