+extern struct displaced_step_closure *amd64_displaced_step_copy_insn
+ (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs);
+extern void amd64_displaced_step_fixup (struct gdbarch *gdbarch,
+ struct displaced_step_closure *closure,
+ CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs);