gdb/aarch64: Use default gdbarch methods where possible

Make use of the default gdbarch methods for gdbarch_dummy_id,
gdbarch_unwind_pc, and gdbarch_unwind_sp where possible.

I have not tested this change but, by inspecting the code, I believe
the default methods are equivalent to the code being deleted.

gdb/ChangeLog:

	* gdb/aarch64-tdep.c (aarch64_dummy_id): Delete.
	(aarch64_unwind_pc): Delete.
	(aarch64_unwind_sp): Delete.
	(aarch64_gdbarch_init): Don't register deleted functions with
	gdbarch.

2 files changed, 8 insertions, 38 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ae9a68f..e06d2d9 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,13 @@
 2019-02-27  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* gdb/aarch64-tdep.c (aarch64_dummy_id): Delete.
+	(aarch64_unwind_pc): Delete.
+	(aarch64_unwind_sp): Delete.
+	(aarch64_gdbarch_init): Don't register deleted functions with
+	gdbarch.
+
+2019-02-27  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* gdbtypes.c (type_align): Don't consider static members when
 	computing structure alignment.
 
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index f855393..dd57ef9 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -998,39 +998,6 @@ struct frame_base aarch64_normal_base =
   aarch64_normal_frame_base
 };
 
-/* Assuming THIS_FRAME is a dummy, return the frame ID of that
-   dummy frame.  The frame ID's base needs to match the TOS value
-   saved by save_dummy_frame_tos () and returned from
-   aarch64_push_dummy_call, and the PC needs to match the dummy
-   frame's breakpoint.  */
-
-static struct frame_id
-aarch64_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
-  return frame_id_build (get_frame_register_unsigned (this_frame,
-						      AARCH64_SP_REGNUM),
-			 get_frame_pc (this_frame));
-}
-
-/* Implement the "unwind_pc" gdbarch method.  */
-
-static CORE_ADDR
-aarch64_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
-  CORE_ADDR pc
-    = frame_unwind_register_unsigned (this_frame, AARCH64_PC_REGNUM);
-
-  return pc;
-}
-
-/* Implement the "unwind_sp" gdbarch method.  */
-
-static CORE_ADDR
-aarch64_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
-  return frame_unwind_register_unsigned (this_frame, AARCH64_SP_REGNUM);
-}
-
 /* Return the value of the REGNUM register in the previous frame of
    *THIS_FRAME.  */
 
@@ -3091,11 +3058,6 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_push_dummy_call (gdbarch, aarch64_push_dummy_call);
   set_gdbarch_frame_align (gdbarch, aarch64_frame_align);
 
-  /* Frame handling.  */
-  set_gdbarch_dummy_id (gdbarch, aarch64_dummy_id);
-  set_gdbarch_unwind_pc (gdbarch, aarch64_unwind_pc);
-  set_gdbarch_unwind_sp (gdbarch, aarch64_unwind_sp);
-
   /* Advance PC across function entry code.  */
   set_gdbarch_skip_prologue (gdbarch, aarch64_skip_prologue);