cpukit/aarch64: Add libdebugger support

This adds support for libdebugger under AArch64 using software
breakpoints and the single-step execution mode present in all AArch64
CPUs.

spec/build/cpukit/libdebugger.yml

@@ -10,6 +10,8 @@ includes: []
 install: []
 install-path: ${BSP_LIBDIR}
 links:
+- role: build-dependency
+  uid: objdbgaarch64
 - role: build-dependency
   uid: objdbgarm
 - role: build-dependency

spec/build/cpukit/objdbgaarch64.yml

@@ -0,0 +1,15 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+build-type: objects
+cflags: []
+copyrights:
+- Copyright (C) 2021 On-Line Applications Research (OAR)
+cppflags: []
+cxxflags: []
+enabled-by:
+- aarch64
+includes: []
+install: []
+links: []
+source:
+- cpukit/libdebugger/rtems-debugger-aarch64.c
+type: build

spec/build/cpukit/optlibdebugger.yml

@@ -9,6 +9,7 @@ default: null
 default-by-variant: []
 description: ''
 enabled-by:
+- aarch64
 - arm
 - i386
 links: []