libdebugger: ARM fixes for Cortex-A8 and ARM mode.

- Fix destorying the target and thread parts.
- Fix the ARM backend to support Cortex-A8 and ARM mode code.
- Use the DBGDSCR interrupt mask when single stepping.
- Use the DBGDSCR method of entry to debug mode to filter the
  execptions.
- Add support for BSPs to control the ARM backend.

1 files changed, 66 insertions, 0 deletions

diff --git a/cpukit/include/rtems/debugger/rtems-debugger-bsp.h b/cpukit/include/rtems/debugger/rtems-debugger-bsp.h
new file mode 100644
index 0000000000..be79912a80
--- /dev/null
+++ b/cpukit/include/rtems/debugger/rtems-debugger-bsp.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2019 Chris Johns <chrisj@rtems.org>.
+ * All rights reserved.
+ *
+ * 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 AUTHOR 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 AUTHOR 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.
+ */
+
+/*
+ * Debugger BSP support.
+ */
+
+#ifndef _RTEMS_DEBUGGER_BSP_h
+#define _RTEMS_DEBUGGER_BSP_h
+
+#include <rtems/rtems-debugger.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * ARM
+ */
+
+/**
+ * Debug registers
+ *
+ * Return the debugger registers for you BSP if the SoC requires memory mapped
+ * registers and the DBGDRAR and DBGDSAR are not support or return 0. This
+ * function is provided in the ARM backend and declared weak.
+ */
+void* rtems_debugger_arm_debug_registers(void);
+
+/**
+ * Configure the debug interface.
+ *
+ * Some ARM devices need special configurations to enable the debugging
+ * hardware. The device are often locked down for securty reasons and
+ * the debug hardware in the ARM needs to be enabled (asserting DBGEN).
+ */
+bool rtems_debugger_arm_debug_configure(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif