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+/** @file debug_stub.h
+ * @brief Shared C/ASM header file for debugger stub
+ *
+ */
+
+/* Copyright (C) 2007-2010 the NxOS developers
+ *
+ * Module Developed by: TC Wan <tcwan@cs.usm.my>
+ *
+ * See AUTHORS for a full list of the developers.
+ *
+ * Redistribution of this file is permitted under
+ * the terms of the GNU Public License (GPL) version 2.
+ */
+
+#ifndef __DEBUG_STUB_H__
+#define __DEBUG_STUB_H__
+
+#include "_c_arm_macros.h"
+
+#ifndef __ASSEMBLY__
+#include "types.h"
+#endif
+
+/** @addtogroup debugger */
+/*@{*/
+
+
+/* Declarations go here. */
+/** @name Debug Message Constants.
+ *
+ * Debug Message Values
+ */
+/*@{*/
+#define MSGBUF_SIZE 256 /* Debug Message Buffer Size */
+#define MSGBUF_STARTCHAR '$'
+#define MSGBUF_ACKCHAR '+'
+#define MSGBUF_NAKCHAR '-'
+#define MSGBUF_ERRCHAR 'E'
+#define MSGBUF_SIGCHAR 'S'
+#define MSG_ERRCHKSUM 1
+#define MSG_UNKNOWNCMD 2
+#define MSGBUF_CMDINDEX_OUTOFRANGE_VAL -1
+
+/*@}*/
+
+/** @name Bitmask Definitions.
+ *
+ * Various Bitmasks used for data manipulation.
+ */
+/*@{*/
+#define BKPT_STATE_THUMB_FLAG 0x01 /* Flag Thumb Breakpoint */
+#define ASCII_LOWER2UPPER_MASK 0x20 /* ASCII Conversion bitmask */
+#define NIBBLE0 0x0000000F /* Nibble 0 word(3:0) */
+#define NIBBLE1 0x000000F0 /* Nibble 1 word(7:4) */
+#define NIBBLE2 0x00000F00 /* Nibble 2 word(11:8) */
+#define NIBBLE3 0x0000F000 /* Nibble 3 word(15:12) */
+#define NIBBLE4 0x000F0000 /* Nibble 4 word(19:16) */
+#define NIBBLE5 0x00F00000 /* Nibble 5 word(23:20) */
+#define NIBBLE6 0x0F000000 /* Nibble 6 word(27:24) */
+#define NIBBLE7 0xF0000000 /* Nibble 7 word(31:28) */
+#define BYTE0 0x000000FF /* Byte 0 word(7:0) */
+#define BYTE1 0x0000FF00 /* Byte 1 word(15:8) */
+#define BYTE2 0x00FF0000 /* Byte 2 word(23:16) */
+#define BYTE3 0xFF000000 /* Byte 3 word(31:24) */
+#define HLFWRD0 0x0000FFFF /* Halfword 0 word(15:0) */
+#define HLFWRD1 0xFFFF0000 /* Halfword 0 word(31:16) */
+/*@}*/
+
+/** @name BKPT suppport constants
+ *
+ * ARM and Thumb Breakpoint Instructions.
+ */
+/*@{*/
+#define BKPT32_INSTR 0xE1200070 /* ARM BKPT instruction */
+#define BKPT32_ENUM_MASK 0x000FFF0F /* ARM BKPT Enum Mask */
+#define BKPT32_AUTO_BKPT 0x00080000 /* ARM BKPT Auto-Step Flag (for CONT support) */
+#define BKPT32_MANUAL_BKPT 0x0007FF0F /* Manually inserted ARM Breakpoint */
+
+#define BKPT16_INSTR 0xBE00 /* Thumb BKPT instruction (not supported currently) */
+#define BKPT16_ENUM_MASK 0x00FF /* Thumb BKPT Enum Mask */
+#define BKPT16_AUTO_BKPT 0x0080 /* Thumb BKPT Auto-Step Flag (for CONT support) */
+#define BKPT16_MANUAL_BKPT 0x007F /* Manually inserted Thumb Breakpoint */
+/*@}*/
+
+/** Debugger State Enums
+ *
+ * Debugger State.
+ * The enums must be consecutive, starting from 0
+ */
+ENUM_BEGIN
+ENUM_VALASSIGN(DBG_RESET, 0) /**< Initial State. */
+ENUM_VAL(DBG_INIT) /**< Debugger Initialized. */
+ENUM_VAL(DBG_MANUAL_BKPT_ARM) /**< Manual ARM Breakpoint. */
+ENUM_VAL(DBG_NORMAL_BKPT_ARM) /**< Normal ARM Breakpoint (Single Step, Normal). */
+ENUM_VAL(DBG_MANUAL_BKPT_THUMB) /**< Manual Thumb Breakpoint. */
+ENUM_VAL(DBG_NORMAL_BKPT_THUMB) /**< Normal Thumb Breakpoint (Single Step, Normal). */
+ENUM_END(dbg_state_t)
+
+#ifndef __ASSEMBLY__
+
+/* Define C stuff */
+/** @defgroup debug_public */
+/*@{*/
+
+
+/** Initialize Debugger.
+ * Equivalent to GDB set_debug_traps() routine
+ */
+FUNCDEF void dbg__bkpt_init(void);
+
+/** Debugger Handler Routine (called by Exception Handler Trap).
+ * Equivalent to GDB handle_exception() routine
+ */
+FUNCDEF void dbg__bkpt_handler(void);
+
+/** dbg_breakpoint_arm.
+ * Equivalent to GDB breakpoint() routine for ARM code
+ */
+FUNCDEF inline void dbg_breakpoint_arm(void) { asm volatile (".word BKPT32_INSTR | BKPT32_MANUAL_BKPT") }
+
+/** dbg_breakpoint_thumb.
+ * Equivalent to GDB breakpoint() routine for Thumb code
+ */
+FUNCDEF inline void dbg_breakpoint_thumb(void) { asm volatile (".hword BKPT16_INSTR | BKPT16_MANUAL_BKPT") }
+
+/*@}*/
+
+#else
+/* Define Assembly stuff */
+
+/* dbg__bkpt_arm
+ * GDB breakpoint() for ARM mode
+ */
+ .macro dbg__bkpt_arm
+ .word (BKPT32_INSTR | BKPT32_MANUAL_BKPT)
+ .endm
+
+/* dbg__bkpt_arm
+ * GDB breakpoint() for Thumb mode
+ */
+ .macro dbg__bkpt_thumb
+ .hword (BKPT16_INSTR | BKPT16_MANUAL_BKPT)
+ .endm
+
+#endif
+ /*@}*/
+
+#endif /* __DEBUG_STUB_H__ */