[PATCH v1 2/5] cpukit/microblaze: Add debug vector and handler
Kinsey Moore
kinsey.moore at oarcorp.com
Tue Feb 1 15:25:55 UTC 2022
This patch adds a vector for debug events along with a hook similar to
the exception framework. The debug vector generates an exception frame
for use by libdebugger.
---
.../start/_debug_sw_break_handler.S | 106 ++++++++++++++++++
bsps/microblaze/shared/start/start.S | 7 +-
cpukit/score/cpu/microblaze/cpu.c | 26 +++++
.../cpu/microblaze/include/rtems/score/cpu.h | 9 ++
.../bsps/microblaze/microblaze_fpga/obj.yml | 1 +
5 files changed, 148 insertions(+), 1 deletion(-)
create mode 100644 bsps/microblaze/microblaze_fpga/start/_debug_sw_break_handler.S
diff --git a/bsps/microblaze/microblaze_fpga/start/_debug_sw_break_handler.S b/bsps/microblaze/microblaze_fpga/start/_debug_sw_break_handler.S
new file mode 100644
index 0000000000..ebf69f6d53
--- /dev/null
+++ b/bsps/microblaze/microblaze_fpga/start/_debug_sw_break_handler.S
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSBSPsMicroblaze
+ *
+ * @brief MicroBlaze debug trap handler implementation
+ */
+
+/*
+ * Copyright (C) 2022 On-Line Applications Research Corporation (OAR)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <rtems/score/cpu.h>
+
+ .text
+ .globl _debug_sw_break_handler # HW Exception Handler Label
+ .extern _CPU_Debug_handle
+ .align 2
+
+ _debug_sw_break_handler:
+ /* The stack used here does not matter since debug cannot recurse */
+
+ /* Subtract exception frame */
+ addik r1, r1, -(CPU_EXCEPTION_FRAME_SIZE)
+
+ /* Store program state */
+ swi r2, r1, MICROBLAZE_EXCEPTION_FRAME_R2
+ swi r3, r1, MICROBLAZE_EXCEPTION_FRAME_R3
+ swi r4, r1, MICROBLAZE_EXCEPTION_FRAME_R4
+ swi r5, r1, MICROBLAZE_EXCEPTION_FRAME_R5
+ swi r6, r1, MICROBLAZE_EXCEPTION_FRAME_R6
+ swi r7, r1, MICROBLAZE_EXCEPTION_FRAME_R7
+ swi r8, r1, MICROBLAZE_EXCEPTION_FRAME_R8
+ swi r9, r1, MICROBLAZE_EXCEPTION_FRAME_R9
+ swi r10, r1, MICROBLAZE_EXCEPTION_FRAME_R10
+ swi r11, r1, MICROBLAZE_EXCEPTION_FRAME_R11
+ swi r12, r1, MICROBLAZE_EXCEPTION_FRAME_R12
+ swi r13, r1, MICROBLAZE_EXCEPTION_FRAME_R13
+ swi r14, r1, MICROBLAZE_EXCEPTION_FRAME_R14
+ swi r15, r1, MICROBLAZE_EXCEPTION_FRAME_R15
+ swi r16, r1, MICROBLAZE_EXCEPTION_FRAME_R16
+ swi r17, r1, MICROBLAZE_EXCEPTION_FRAME_R17
+ swi r18, r1, MICROBLAZE_EXCEPTION_FRAME_R18
+ swi r19, r1, MICROBLAZE_EXCEPTION_FRAME_R19
+ swi r20, r1, MICROBLAZE_EXCEPTION_FRAME_R20
+ swi r21, r1, MICROBLAZE_EXCEPTION_FRAME_R21
+ swi r22, r1, MICROBLAZE_EXCEPTION_FRAME_R22
+ swi r23, r1, MICROBLAZE_EXCEPTION_FRAME_R23
+ swi r24, r1, MICROBLAZE_EXCEPTION_FRAME_R24
+ swi r25, r1, MICROBLAZE_EXCEPTION_FRAME_R25
+ swi r26, r1, MICROBLAZE_EXCEPTION_FRAME_R26
+ swi r27, r1, MICROBLAZE_EXCEPTION_FRAME_R27
+ swi r28, r1, MICROBLAZE_EXCEPTION_FRAME_R28
+ swi r29, r1, MICROBLAZE_EXCEPTION_FRAME_R29
+ swi r30, r1, MICROBLAZE_EXCEPTION_FRAME_R30
+ swi r31, r1, MICROBLAZE_EXCEPTION_FRAME_R31
+
+ /* Retrieve and store MSR */
+ mfs r3, rmsr
+ swi r3, r1, MICROBLAZE_EXCEPTION_FRAME_MSR
+
+ /* Retrieve and store EAR */
+ mfs r3, rear
+ swi r3, r1, MICROBLAZE_EXCEPTION_FRAME_EAR
+
+ /* Retrieve and store ESR */
+ mfs r3, resr
+ swi r3, r1, MICROBLAZE_EXCEPTION_FRAME_ESR
+
+ /* Retrieve and store BTR */
+ mfs r3, rbtr
+ swi r3, r1, MICROBLAZE_EXCEPTION_FRAME_BTR
+
+ /* Calculate and store original stack pointer */
+ addik r3, r1, CPU_EXCEPTION_FRAME_SIZE
+ swi r3, r1, MICROBLAZE_EXCEPTION_FRAME_R1
+
+ /* set parameter 1 to CPU Exception frame */
+ addi r5, r1, 0
+
+ /* call into the debug framework */
+ braid _CPU_Debug_handle
+ nop
diff --git a/bsps/microblaze/shared/start/start.S b/bsps/microblaze/shared/start/start.S
index bd50fe0d24..e9aaa706e5 100644
--- a/bsps/microblaze/shared/start/start.S
+++ b/bsps/microblaze/shared/start/start.S
@@ -46,7 +46,7 @@
# 0x14 # Hardware Interrupt _interrupt_handler
# 0x18 # (-- IMM --)
- # 0x1C # Breakpoint Exception (-- Don't Care --)
+ # 0x1C # Breakpoint Exception _debug_sw_break_handler
# 0x20 # (-- IMM --)
# 0x24 # Hardware Exception _hw_exception_handler
@@ -73,6 +73,11 @@ _vector_sw_exception:
_vector_interrupt:
brai _interrupt_handler
+ .section .vectors.debug_sw_break, "ax"
+ .align 2
+_vector_debug_sw_break:
+ brai _debug_sw_break_handler
+
.section .vectors.hw_exception, "ax"
.align 2
_vector_hw_exception:
diff --git a/cpukit/score/cpu/microblaze/cpu.c b/cpukit/score/cpu/microblaze/cpu.c
index 84b85c44e0..c75aa0f147 100644
--- a/cpukit/score/cpu/microblaze/cpu.c
+++ b/cpukit/score/cpu/microblaze/cpu.c
@@ -204,3 +204,29 @@ void _CPU_Exception_handle( CPU_Exception_frame *ef )
rtems_fatal( RTEMS_FATAL_SOURCE_EXCEPTION, (rtems_fatal_code) ef );
}
+
+CPU_Exception_handler installed_debug_handler = NULL;
+
+void _CPU_Debug_install_handler(
+ CPU_Exception_handler new_handler,
+ CPU_Exception_handler *old_handler
+)
+{
+ if ( old_handler != NULL ) {
+ *old_handler = installed_debug_handler;
+ }
+
+ installed_debug_handler = new_handler;
+}
+
+void _CPU_Debug_handle( CPU_Exception_frame *ef )
+{
+ /* BiP is not set for software debug events, set it here */
+ ef->msr |= MICROBLAZE_MSR_BIP;
+
+ if ( installed_debug_handler != NULL ) {
+ installed_debug_handler( ef );
+ }
+
+ rtems_fatal( RTEMS_FATAL_SOURCE_EXCEPTION, (rtems_fatal_code) ef );
+}
diff --git a/cpukit/score/cpu/microblaze/include/rtems/score/cpu.h b/cpukit/score/cpu/microblaze/include/rtems/score/cpu.h
index 91839a18ab..37b6779481 100644
--- a/cpukit/score/cpu/microblaze/include/rtems/score/cpu.h
+++ b/cpukit/score/cpu/microblaze/include/rtems/score/cpu.h
@@ -344,6 +344,15 @@ void _CPU_Exception_handle(
CPU_Exception_frame *ef
);
+void _CPU_Debug_install_handler(
+ CPU_Exception_handler new_handler,
+ CPU_Exception_handler *old_handler
+);
+
+void _CPU_Debug_handle(
+ CPU_Exception_frame *ef
+);
+
void _CPU_Context_switch(
Context_Control *run,
Context_Control *heir
diff --git a/spec/build/bsps/microblaze/microblaze_fpga/obj.yml b/spec/build/bsps/microblaze/microblaze_fpga/obj.yml
index 0635a06f0c..f7e9bd7cc3 100644
--- a/spec/build/bsps/microblaze/microblaze_fpga/obj.yml
+++ b/spec/build/bsps/microblaze/microblaze_fpga/obj.yml
@@ -24,6 +24,7 @@ source:
- bsps/microblaze/microblaze_fpga/console/console-io.c
- bsps/microblaze/microblaze_fpga/console/debug-io.c
- bsps/microblaze/microblaze_fpga/irq/irq.c
+- bsps/microblaze/microblaze_fpga/start/_debug_sw_break_handler.S
- bsps/microblaze/microblaze_fpga/start/_exception_handler.S
- bsps/microblaze/microblaze_fpga/start/_interrupt_handler.S
- bsps/microblaze/microblaze_fpga/start/bspreset.c
--
2.30.2
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