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.

bsps/aarch64/include/bsp/aarch64-mmu.h

@@ -371,6 +371,17 @@ aarch64_mmu_enable( void )
   _AArch64_Write_sctlr_el1( sctlr );
 }
 
+BSP_START_TEXT_SECTION static inline void
+aarch64_mmu_disable( void )
+{
+  uint64_t sctlr;
+
+  /* Enable MMU and cache */
+  sctlr = _AArch64_Read_sctlr_el1();
+  sctlr &= ~(AARCH64_SCTLR_EL1_M);
+  _AArch64_Write_sctlr_el1( sctlr );
+}
+
 BSP_START_TEXT_SECTION static inline void aarch64_mmu_setup( void )
 {
   /* Set TCR */

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: []