cpukit/libdebugger: Add MicroBlaze support

Add MicroBlaze support for libdebugger. This uses only software break
type instructions to provide self-hosted GDB debugging support for
applications since internal control of debug hardware is not possible.

Also of note, this implementation for MicroBlaze would typically use the
brki instruction for software break, but instead uses an illegal opcode
to manage software breaks as exceptions. This is due to poor interaction
with the debug hardware where the debug hardware will intercept software
breaks instead of allowing the software break vector to execute.

cpukit/score/cpu/microblaze/include/rtems/score/cpu.h

@@ -208,6 +208,30 @@ typedef struct {
 #define _CPU_MSR_SET( _msr_value ) \
 { __asm__ volatile ("mts rmsr, %0" : "=&r" ((_msr_value)) : "0" ((_msr_value))); }
 
+#define MICROBLAZE_PVR0_VERSION_GET( _pvr0_value ) \
+  ( ( _pvr0_value >> 8 ) & 0xff )
+
+#define _CPU_PVR0_GET( _pvr0_value ) \
+  do { \
+    ( _pvr0_value ) = 0; \
+    __asm__ volatile ( "mfs %0, rpvr0" : "=&r" ( ( _pvr0_value ) ) ); \
+  } while ( 0 )
+
+#define MICROBLAZE_PVR3_BP_GET( _pvr3_value ) \
+  ( ( _pvr3_value >> 25 ) & 0xf )
+
+#define MICROBLAZE_PVR3_RWP_GET( _pvr3_value ) \
+  ( ( _pvr3_value >> 19 ) & 0x7 )
+
+#define MICROBLAZE_PVR3_WWP_GET( _pvr3_value ) \
+  ( ( _pvr3_value >> 13 ) & 0x7 )
+
+#define _CPU_PVR3_GET( _pvr3_value ) \
+  do { \
+    ( _pvr3_value ) = 0; \
+    __asm__ volatile ( "mfs %0, rpvr3" : "=&r" ( ( _pvr3_value ) ) ); \
+  } while ( 0 )
+
 #define _CPU_ISR_Disable( _isr_cookie ) \
   { \
     unsigned int _new_msr;  \

spec/build/cpukit/libdebugger.yml

@@ -16,6 +16,8 @@ links:
   uid: objdbgarm
 - role: build-dependency
   uid: objdbgi386
+- role: build-dependency
+  uid: objdbgmicroblaze
 source:
 - cpukit/libdebugger/rtems-debugger-block.c
 - cpukit/libdebugger/rtems-debugger-bsp.c

spec/build/cpukit/objdbgmicroblaze.yml

@@ -0,0 +1,15 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+build-type: objects
+cflags: []
+copyrights:
+- Copyright (C) 2022 On-Line Applications Research (OAR)
+cppflags: []
+cxxflags: []
+enabled-by:
+- microblaze
+includes: []
+install: []
+links: []
+source:
+- cpukit/libdebugger/rtems-debugger-microblaze.c
+type: build

spec/build/cpukit/optlibdebugger.yml

@@ -12,6 +12,7 @@ enabled-by:
 - aarch64
 - arm
 - i386
+- microblaze
 links: []
 name: BUILD_LIBDEBUGGER
 type: build