-/* Fallback for register convertible. */
-extern gdbarch_register_convertible_ftype generic_register_convertible_not;
-
-extern CORE_ADDR generic_cannot_extract_struct_value_address (char *dummy);
-
-/* Helper function for targets that don't know how my arguments are
- being passed */
-extern gdbarch_frame_num_args_ftype frame_num_args_unknown;
-
-/* Implementation of breakpoint from PC using any of the deprecated
- macros BREAKPOINT, LITTLE_BREAKPOINT, BIG_BREAPOINT. For legacy
- targets that don't yet implement their own breakpoint_from_pc(). */
-extern gdbarch_breakpoint_from_pc_ftype legacy_breakpoint_from_pc;
-
-/* Implementation of extract return value that grubs around in the
- register cache. */
-extern gdbarch_extract_return_value_ftype legacy_extract_return_value;
-
-/* Frameless functions not identifable. */
-extern gdbarch_frameless_function_invocation_ftype generic_frameless_function_invocation_not;
-
-/* Only structures, unions, and arrays are returned using the struct
- convention. Note that arrays are never passed by value in the C
- language family, so that case is irrelevant for C. */
-extern gdbarch_return_value_on_stack_ftype generic_return_value_on_stack_not;
-
-/* Map onto old REGISTER_NAMES. */
-extern const char *legacy_register_name (int i);
-
-/* Accessor for old global function pointer for disassembly. */
-extern int legacy_print_insn (bfd_vma vma, disassemble_info *info);
-
-/* Backward compatible call_dummy_words. */
-extern LONGEST legacy_call_dummy_words[];
-extern int legacy_sizeof_call_dummy_words;
-
-/* Typical remote_translate_xfer_address */
-extern gdbarch_remote_translate_xfer_address_ftype generic_remote_translate_xfer_address;
-
-/* Generic implementation of prologue_frameless_p. Just calls
- SKIP_PROLOG and checks the return value to see if it actually
- changed. */
-extern gdbarch_prologue_frameless_p_ftype generic_prologue_frameless_p;
-
-/* The only possible cases for inner_than. */
+/* An implementation of gdbarch_displaced_step_copy_insn for
+ processors that don't need to modify the instruction before
+ single-stepping the displaced copy.
+
+ Simply copy gdbarch_max_insn_length (ARCH) bytes from FROM to TO.
+ The closure is an array of that many bytes containing the
+ instruction's bytes, allocated with xmalloc. */
+extern struct displaced_step_closure *
+ simple_displaced_step_copy_insn (struct gdbarch *gdbarch,
+ CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs);
+
+/* Simple implementation of gdbarch_displaced_step_free_closure: Call
+ xfree.
+ This is appropriate for use with simple_displaced_step_copy_insn. */
+extern void
+ simple_displaced_step_free_closure (struct gdbarch *gdbarch,
+ struct displaced_step_closure *closure);
+
+/* Default implementation of gdbarch_displaced_hw_singlestep. */
+extern int
+ default_displaced_step_hw_singlestep (struct gdbarch *,
+ struct displaced_step_closure *);
+
+/* Possible value for gdbarch_displaced_step_location:
+ Place displaced instructions at the program's entry point,
+ leaving space for inferior function call return breakpoints. */
+extern CORE_ADDR displaced_step_at_entry_point (struct gdbarch *gdbarch);
+
+/* The only possible cases for inner_than. */