New target methods for memory tagging support

This patch starts adding some of the generic pieces to accomodate memory
tagging.

We have three new target methods:

- supports_memory_tagging: Checks if the target supports memory tagging. This
  defaults to false for targets that don't support memory tagging.

- fetch_memtags: Fetches the allocation tags associated with a particular
  memory range [address, address + length).

  The default is to return 0 without returning any tags. This should only
  be called if memory tagging is supported.

- store_memtags: Stores a set of allocation tags for a particular memory
  range [address, address + length).

  The default is to return 0. This should only
  be called if memory tagging is supported.

gdb/ChangeLog:

2021-03-24  Luis Machado  <luis.machado@linaro.org>

	* remote.c (remote_target) <supports_memory_tagging>: New method
	override.
	<fetch_memtags>: New method override.
	<store_memtags>: New method override.
	(remote_target::supports_memory_tagging): New method.
	(remote_target::fetch_memtags): New method.
	(remote_target::store_memtags): New method.
	* target-delegates.c: Regenerate.
	* target.h (struct target_ops) <supports_memory_tagging>: New virtual
	method.
	<fetch_memtags>: New virtual method.
	<store_memtags>: New virtual method.
	(target_supports_memory_tagging): Define.
	(target_fetch_memtags): Define.
	(target_store_memtags): Define.
	* target-debug.h (target_debug_print_size_t)
	(target_debug_print_const_gdb_byte_vector_r)
	(target_debug_print_gdb_byte_vector_r): New functions.

1 files changed, 34 insertions, 0 deletions

diff --git a/gdb/remote.c b/gdb/remote.c
index a7f3539..eb6ef04 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -690,6 +690,14 @@ public:
   int remove_exec_catchpoint (int) override;
   enum exec_direction_kind execution_direction () override;
 
+  bool supports_memory_tagging () override;
+
+  bool fetch_memtags (CORE_ADDR address, size_t len,
+		      gdb::byte_vector &tags, int type) override;
+
+  bool store_memtags (CORE_ADDR address, size_t len,
+		      const gdb::byte_vector &tags, int type) override;
+
 public: /* Remote specific methods.  */
 
   void remote_download_command_source (int num, ULONGEST addr,
@@ -14489,6 +14497,32 @@ show_remote_timeout (struct ui_file *file, int from_tty,
 		    value);
 }
 
+/* Implement the "supports_memory_tagging" target_ops method.  */
+
+bool
+remote_target::supports_memory_tagging ()
+{
+  return false;
+}
+
+/* Implement the "fetch_memtags" target_ops method.  */
+
+bool
+remote_target::fetch_memtags (CORE_ADDR address, size_t len,
+			      gdb::byte_vector &tags, int type)
+{
+  return false;
+}
+
+/* Implement the "store_memtags" target_ops method.  */
+
+bool
+remote_target::store_memtags (CORE_ADDR address, size_t len,
+			      const gdb::byte_vector &tags, int type)
+{
+  return false;
+}
+
 void _initialize_remote ();
 void
 _initialize_remote ()