- merged mips target into svn trunk

git-svn-id: svn://svn.berlios.de/openocd/trunk@874 b42882b7-edfa-0310-969c-e2dbd0fdcd60

11 files changed, 2399 insertions, 4 deletions

diff --git a/src/target/Makefile.am b/src/target/Makefile.am
index 5b0ef6e5..adf1add4 100644
--- a/src/target/Makefile.am
+++ b/src/target/Makefile.am
@@ -12,11 +12,12 @@ noinst_LIBRARIES = libtarget.a
 libtarget_a_SOURCES = target.c register.c breakpoints.c armv4_5.c embeddedice.c etm.c arm7tdmi.c arm9tdmi.c \
 	arm_jtag.c arm7_9_common.c algorithm.c arm920t.c arm720t.c armv4_5_mmu.c armv4_5_cache.c arm_disassembler.c \
 	arm966e.c arm926ejs.c feroceon.c etb.c xscale.c arm_simulator.c image.c armv7m.c cortex_m3.c cortex_swjdp.c \
-	etm_dummy.c $(OOCD_TRACE_FILES) target_request.c trace.c arm11.c arm11_dbgtap.c
+	etm_dummy.c $(OOCD_TRACE_FILES) target_request.c trace.c arm11.c arm11_dbgtap.c mips32.c mips_m4k.c \
+	mips32_pracc.c mips_ejtag.c
 noinst_HEADERS = target.h trace.h register.h armv4_5.h embeddedice.h etm.h arm7tdmi.h arm9tdmi.h \
 	arm_jtag.h arm7_9_common.h arm920t.h arm720t.h armv4_5_mmu.h armv4_5_cache.h breakpoints.h algorithm.h \
 	arm_disassembler.h arm966e.h arm926ejs.h etb.h xscale.h arm_simulator.h image.h armv7m.h cortex_m3.h cortex_swjdp.h \
-	etm_dummy.h oocd_trace.h target_request.h trace.h arm11.h
+	etm_dummy.h oocd_trace.h target_request.h trace.h arm11.h mips32.h mips_m4k.h mips_ejtag.h mips32_pracc.h
 
 nobase_dist_pkglib_DATA = xscale/debug_handler.bin event/at91eb40a_reset.script target/at91eb40a.cfg \
 	event/at91r40008_reset.script event/sam7s256_reset.script event/sam7x256_reset.script \
@@ -35,6 +36,6 @@ nobase_dist_pkglib_DATA = xscale/debug_handler.bin event/at91eb40a_reset.script
 	interface/chameleon.cfg interface/at91rm9200.cfg interface/jlink.cfg interface/arm-usb-ocd.cfg \
 	interface/signalyzer.cfg event/eir-sam7se512_reset.script target/eir-sam7se512.cfg \
 	event/hammer_reset.script interface/flyswatter.cfg target/hammer.cfg target/mx31.cfg  \
-	event/str730_program.script event/str750_program.script interface/olimex-jtag-tiny-a.cfg
-	
+	event/str730_program.script event/str750_program.script interface/olimex-jtag-tiny-a.cfg \
+	target/pic32mx.cfg
 
diff --git a/src/target/mips32.c b/src/target/mips32.c
new file mode 100644
index 00000000..f338c1db
--- /dev/null
+++ b/src/target/mips32.c
@@ -0,0 +1,338 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "mips32.h"
+#include "jtag.h"
+#include "log.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+char* mips32_core_reg_list[] =
+{
+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+	"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+	"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
+	"status", "lo", "hi", "badvaddr", "cause", "pc"
+};
+
+mips32_core_reg_t mips32_core_reg_list_arch_info[MIPS32NUMCOREREGS] = 
+{
+	{0, NULL, NULL},
+	{1, NULL, NULL},
+	{2, NULL, NULL},
+	{3, NULL, NULL},
+	{4, NULL, NULL},
+	{5, NULL, NULL},
+	{6, NULL, NULL},
+	{7, NULL, NULL},
+	{8, NULL, NULL},
+	{9, NULL, NULL},
+	{10, NULL, NULL},
+	{11, NULL, NULL},
+	{12, NULL, NULL},
+	{13, NULL, NULL},
+	{14, NULL, NULL},
+	{15, NULL, NULL},
+	{16, NULL, NULL},
+	{17, NULL, NULL},
+	{18, NULL, NULL},
+	{19, NULL, NULL},
+	{20, NULL, NULL},
+	{21, NULL, NULL},
+	{22, NULL, NULL},
+	{23, NULL, NULL},
+	{24, NULL, NULL},
+	{25, NULL, NULL},
+	{26, NULL, NULL},
+	{27, NULL, NULL},
+	{28, NULL, NULL},
+	{29, NULL, NULL},
+	{30, NULL, NULL},
+	{31, NULL, NULL},
+	
+	{32, NULL, NULL},
+	{33, NULL, NULL},
+	{34, NULL, NULL},
+	{35, NULL, NULL},
+	{36, NULL, NULL},
+	{37, NULL, NULL},
+};
+
+u8 mips32_gdb_dummy_fsr_value[] = {0, 0, 0, 0};
+
+reg_t mips32_gdb_dummy_fsr_reg =
+{
+	"GDB dummy floating-point status register", mips32_gdb_dummy_fsr_value, 0, 1, 32, NULL, 0, NULL, 0
+};
+
+u8 mips32_gdb_dummy_fir_value[] = {0, 0, 0, 0};
+
+reg_t mips32_gdb_dummy_fir_reg =
+{
+	"GDB dummy floating-point register", mips32_gdb_dummy_fir_value, 0, 1, 32, NULL, 0, NULL, 0
+};
+
+int mips32_core_reg_arch_type = -1;
+
+int mips32_get_core_reg(reg_t *reg)
+{
+	int retval;
+	mips32_core_reg_t *mips32_reg = reg->arch_info;
+	target_t *target = mips32_reg->target;
+	mips32_common_t *mips32_target = target->arch_info;
+	
+	if (target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+
+	retval = mips32_target->read_core_reg(target, mips32_reg->num);
+	
+	return retval;
+}
+
+int mips32_set_core_reg(reg_t *reg, u8 *buf)
+{
+	mips32_core_reg_t *mips32_reg = reg->arch_info;
+	target_t *target = mips32_reg->target;
+	u32 value = buf_get_u32(buf, 0, 32);
+		
+	if (target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+		
+	buf_set_u32(reg->value, 0, 32, value);
+	reg->dirty = 1;
+	reg->valid = 1;
+
+	return ERROR_OK;
+}
+
+int mips32_read_core_reg(struct target_s *target, int num)
+{
+	u32 reg_value;
+	mips32_core_reg_t *mips_core_reg;
+	
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+		
+	if ((num < 0) || (num >= MIPS32NUMCOREREGS))
+		return ERROR_INVALID_ARGUMENTS;
+
+	mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
+	reg_value = mips32->core_regs[num];
+	buf_set_u32(mips32->core_cache->reg_list[num].value, 0, 32, reg_value);
+	mips32->core_cache->reg_list[num].valid = 1;
+	mips32->core_cache->reg_list[num].dirty = 0;
+	
+	return ERROR_OK;	
+}
+
+int mips32_write_core_reg(struct target_s *target, int num)
+{
+	u32 reg_value;
+	mips32_core_reg_t *mips_core_reg;
+	
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+
+	if ((num < 0) || (num >= MIPS32NUMCOREREGS))
+		return ERROR_INVALID_ARGUMENTS;
+	
+	reg_value = buf_get_u32(mips32->core_cache->reg_list[num].value, 0, 32);
+	mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
+	mips32->core_regs[num] = reg_value;
+	LOG_DEBUG("write core reg %i value 0x%x", num , reg_value);
+	mips32->core_cache->reg_list[num].valid = 1;
+	mips32->core_cache->reg_list[num].dirty = 0;
+	
+	return ERROR_OK;
+}
+
+int mips32_invalidate_core_regs(target_t *target)
+{
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+	int i;
+	
+	for (i = 0; i < mips32->core_cache->num_regs; i++)
+	{
+		mips32->core_cache->reg_list[i].valid = 0;
+		mips32->core_cache->reg_list[i].dirty = 0;
+	}
+	
+	return ERROR_OK;
+}
+
+int mips32_get_gdb_reg_list(target_t *target, reg_t **reg_list[], int *reg_list_size)
+{
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+	int i;
+	
+	/* include fsr/fir reg */
+	*reg_list_size = MIPS32NUMCOREREGS + 2;
+	*reg_list = malloc(sizeof(reg_t*) * (*reg_list_size));
+	
+	for (i = 0; i < MIPS32NUMCOREREGS; i++)
+	{
+		(*reg_list)[i] = &mips32->core_cache->reg_list[i];
+	}
+	
+	/* add dummy floating points regs */
+	(*reg_list)[38] = &mips32_gdb_dummy_fsr_reg;
+	(*reg_list)[39] = &mips32_gdb_dummy_fir_reg;
+	
+	return ERROR_OK;
+}
+
+int mips32_save_context(target_t *target)
+{
+	int i;
+	
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	/* read core registers */
+	mips32_pracc_read_regs(ejtag_info, mips32->core_regs);
+	
+	for (i = 0; i < MIPS32NUMCOREREGS; i++)
+	{
+		if (!mips32->core_cache->reg_list[i].valid)
+		{
+			mips32->read_core_reg(target, i);
+		}
+	}
+	
+	return ERROR_OK;		
+}
+
+int mips32_restore_context(target_t *target)
+{
+	int i;
+	
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	for (i = 0; i < MIPS32NUMCOREREGS; i++)
+	{
+		if (mips32->core_cache->reg_list[i].dirty)
+		{
+			mips32->write_core_reg(target, i);
+		}
+	}
+	
+	/* write core regs */
+	mips32_pracc_write_regs(ejtag_info, mips32->core_regs);
+	
+	return ERROR_OK;		
+}
+
+int mips32_arch_state(struct target_s *target)
+{
+	mips32_common_t *mips32 = target->arch_info;
+	
+	if (mips32->common_magic != MIPS32_COMMON_MAGIC)
+	{
+		LOG_ERROR("BUG: called for a non-MIPS32 target");
+		exit(-1);
+	}
+	
+	LOG_USER("target halted due to %s, pc: 0x%8.8x",
+		target_debug_reason_strings[target->debug_reason],
+		buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
+	
+	return ERROR_OK;
+}
+
+reg_cache_t *mips32_build_reg_cache(target_t *target)
+{
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+
+	int num_regs = MIPS32NUMCOREREGS;
+	reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
+	reg_cache_t *cache = malloc(sizeof(reg_cache_t));
+	reg_t *reg_list = malloc(sizeof(reg_t) * num_regs);
+	mips32_core_reg_t *arch_info = malloc(sizeof(mips32_core_reg_t) * num_regs);
+	int i;
+	
+	if (mips32_core_reg_arch_type == -1)
+		mips32_core_reg_arch_type = register_reg_arch_type(mips32_get_core_reg, mips32_set_core_reg);
+		
+	/* Build the process context cache */ 
+	cache->name = "mips32 registers";
+	cache->next = NULL;
+	cache->reg_list = reg_list;
+	cache->num_regs = num_regs;
+	(*cache_p) = cache;
+	mips32->core_cache = cache;
+	
+	for (i = 0; i < num_regs; i++)
+	{
+		arch_info[i] = mips32_core_reg_list_arch_info[i];
+		arch_info[i].target = target;
+		arch_info[i].mips32_common = mips32;
+		reg_list[i].name = mips32_core_reg_list[i];
+		reg_list[i].size = 32;
+		reg_list[i].value = calloc(1, 4);
+		reg_list[i].dirty = 0;
+		reg_list[i].valid = 0;
+		reg_list[i].bitfield_desc = NULL;
+		reg_list[i].num_bitfields = 0;
+		reg_list[i].arch_type = mips32_core_reg_arch_type;
+		reg_list[i].arch_info = &arch_info[i];
+	}
+	
+	return cache;
+}
+
+int mips32_init_arch_info(target_t *target, mips32_common_t *mips32, int chain_pos, char *variant)
+{
+	target->arch_info = mips32;
+	mips32->common_magic = MIPS32_COMMON_MAGIC;
+	
+	mips32->ejtag_info.chain_pos = chain_pos;
+	mips32->read_core_reg = mips32_read_core_reg;
+	mips32->write_core_reg = mips32_write_core_reg;
+	
+	return ERROR_OK;
+}
+
+int mips32_register_commands(struct command_context_s *cmd_ctx)
+{
+	return ERROR_OK;
+}
+
+int mips32_run_algorithm(struct target_s *target, int num_mem_params, mem_param_t *mem_params, int num_reg_params, reg_param_t *reg_params, u32 entry_point, u32 exit_point, int timeout_ms, void *arch_info)
+{
+	/*TODO*/
+	return ERROR_OK;
+}
diff --git a/src/target/mips32.h b/src/target/mips32.h
new file mode 100644
index 00000000..aeed1a60
--- /dev/null
+++ b/src/target/mips32.h
@@ -0,0 +1,112 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#ifndef MIPS32_H
+#define MIPS32_H
+
+#include "target.h"
+#include "register.h"
+#include "mips_ejtag.h"
+#include "mips32_pracc.h"
+
+#define MIPS32_COMMON_MAGIC		0xB320B320
+
+/* offsets into mips32 core register cache */
+enum 
+{
+	MIPS32_PC = 37,
+	MIPS32NUMCOREREGS
+};
+
+typedef struct mips32_common_s
+{
+	int common_magic;
+	void *arch_info;
+	reg_cache_t *core_cache;
+	mips_ejtag_t ejtag_info;
+	u32 core_regs[MIPS32NUMCOREREGS];
+	
+	/* register cache to processor synchronization */
+	int (*read_core_reg)(struct target_s *target, int num);
+	int (*write_core_reg)(struct target_s *target, int num);
+} mips32_common_t;
+
+typedef struct mips32_core_reg_s
+{
+	u32 num;
+	target_t *target;
+	mips32_common_t *mips32_common;
+} mips32_core_reg_t;
+
+#define MIPS32_OP_BEQ	0x04
+#define MIPS32_OP_ADDI	0x08
+#define MIPS32_OP_AND	0x24
+#define MIPS32_OP_COP0	0x10
+#define MIPS32_OP_LUI	0x0F
+#define MIPS32_OP_LW	0x23
+#define MIPS32_OP_LBU	0x24
+#define MIPS32_OP_LHU	0x25
+#define MIPS32_OP_MFHI	0x10
+#define MIPS32_OP_MFLO	0x12
+#define MIPS32_OP_SB	0x28
+#define MIPS32_OP_SH	0x29
+#define MIPS32_OP_SW	0x2B
+#define MIPS32_OP_ORI	0x0D
+
+#define MIPS32_COP0_MF	0x00
+#define MIPS32_COP0_MT	0x04
+
+#define MIPS32_R_INST(opcode, rs, rt, rd, shamt, funct)	(((opcode)<<26) |((rs)<<21)|((rt)<<16)|((rd)<<11)| ((shamt)<<5) | (funct))
+#define MIPS32_I_INST(opcode, rs, rt, immd)	(((opcode)<<26) |((rs)<<21)|((rt)<<16)|(immd))
+#define MIPS32_J_INST(opcode, addr)	(((opcode)<<26) |(addr))
+
+#define MIPS32_NOP					0
+#define MIPS32_ADDI(tar, src, val)	MIPS32_I_INST(MIPS32_OP_ADDI, src, tar, val)
+#define MIPS32_AND(reg, off, val)	MIPS32_R_INST(0, off, val, reg, 0, MIPS32_OP_AND)
+#define MIPS32_B(off)				MIPS32_BEQ(0, 0, off)
+#define MIPS32_BEQ(src,tar,off)		MIPS32_I_INST(MIPS32_OP_BEQ, src, tar, off)
+#define MIPS32_MFC0(gpr, cpr, sel)	MIPS32_R_INST(MIPS32_OP_COP0, MIPS32_COP0_MF, gpr, cpr, 0, sel)
+#define MIPS32_MTC0(gpr,cpr, sel)	MIPS32_R_INST(MIPS32_OP_COP0, MIPS32_COP0_MT, gpr, cpr, 0, sel)
+#define MIPS32_LBU(reg, off, base)	MIPS32_I_INST(MIPS32_OP_LBU, base, reg, off)
+#define MIPS32_LHU(reg, off, base)	MIPS32_I_INST(MIPS32_OP_LHU, base, reg, off)
+#define MIPS32_LUI(reg, val)		MIPS32_I_INST(MIPS32_OP_LUI, 0, reg, val)
+#define MIPS32_LW(reg, off, base)	MIPS32_I_INST(MIPS32_OP_LW, base, reg, off)
+#define MIPS32_LO(reg)				MIPS32_R_INST(0, 0, 0, reg, 0, MIPS32_OP_MFHI)
+#define MIPS32_HI(reg)				MIPS32_R_INST(0, 0, 0, reg, 0, MIPS32_OP_MFLO)
+#define MIPS32_ORI(src, tar, val)	MIPS32_I_INST(MIPS32_OP_ORI, src, tar, val)
+#define MIPS32_SB(reg, off, base)	MIPS32_I_INST(MIPS32_OP_SB, base, reg, off)
+#define MIPS32_SH(reg, off, base)	MIPS32_I_INST(MIPS32_OP_SH, base, reg, off)
+#define MIPS32_SW(reg, off, base)	MIPS32_I_INST(MIPS32_OP_SW, base, reg, off)
+#define MIPS32_DRET					0x4200001F
+
+extern int mips32_arch_state(struct target_s *target);
+extern int mips32_init_arch_info(target_t *target, mips32_common_t *mips32, int chain_pos, char *variant);
+extern int mips32_restore_context(target_t *target);
+extern int mips32_save_context(target_t *target);
+extern reg_cache_t *mips32_build_reg_cache(target_t *target);
+extern int mips32_run_algorithm(struct target_s *target, int num_mem_params, mem_param_t *mem_params, int num_reg_params, reg_param_t *reg_params, u32 entry_point, u32 exit_point, int timeout_ms, void *arch_info);
+
+extern int mips32_register_commands(struct command_context_s *cmd_ctx);
+extern int mips32_invalidate_core_regs(target_t *target);
+extern int mips32_get_gdb_reg_list(target_t *target, reg_t **reg_list[], int *reg_list_size);
+
+#endif	/*MIPS32_H*/
diff --git a/src/target/mips32_pracc.c b/src/target/mips32_pracc.c
new file mode 100644
index 00000000..400227e9
--- /dev/null
+++ b/src/target/mips32_pracc.c
@@ -0,0 +1,781 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "log.h"
+#include "mips32.h"
+#include "mips32_pracc.h"
+
+typedef struct {
+	u32 *local_iparam;
+	int num_iparam;
+	u32 *local_oparam;
+	int num_oparam;
+	u32 *code;
+	int code_len;
+	u32 stack[32];
+	int stack_offset;
+	mips_ejtag_t *ejtag_info;
+} mips32_pracc_context;
+
+static int wait_for_pracc_rw(mips_ejtag_t *ejtag_info, u32 *ctrl)
+{
+	u32 ejtag_ctrl;
+	
+	while (1) 
+	{
+		mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
+		ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
+		mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
+		if (ejtag_ctrl & EJTAG_CTRL_PRACC)
+			break;
+		LOG_DEBUG("DEBUGMODULE: No memory access in progress!\n");
+		return ERROR_JTAG_DEVICE_ERROR;
+	}
+	
+	*ctrl = ejtag_ctrl;
+	return ERROR_OK;
+}
+
+static int mips32_pracc_exec_read(mips32_pracc_context *ctx, u32 address)
+{
+	int offset;
+	u32 ctrl, data;
+
+	if ((address >= MIPS32_PRACC_PARAM_IN)
+		&& (address <= MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4))
+	{
+		offset = (address - MIPS32_PRACC_PARAM_IN) / 4;
+		data = ctx->local_iparam[offset];
+	}
+	else if ((address >= MIPS32_PRACC_PARAM_OUT)
+		&& (address <= MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4))
+	{
+		offset = (address - MIPS32_PRACC_PARAM_OUT) / 4;
+		data = ctx->local_oparam[offset];
+	}
+	else if ((address >= MIPS32_PRACC_TEXT)
+		&& (address <= MIPS32_PRACC_TEXT + ctx->code_len*4))
+	{
+		offset = (address - MIPS32_PRACC_TEXT) / 4;
+		data = ctx->code[offset];
+	}
+	else if (address == MIPS32_PRACC_STACK)
+	{
+		/* save to our debug stack */
+		data = ctx->stack[--ctx->stack_offset];
+	}
+	else
+	{
+		/* TODO: send JMP 0xFF200000 instruction. Hopefully processor jump back
+		 * to start of debug vector */
+		
+		data = 0;
+		LOG_ERROR("Error reading unexpected address");
+		return ERROR_JTAG_DEVICE_ERROR;
+	}
+	
+	/* Send the data out */
+	mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_DATA, NULL);
+	mips_ejtag_drscan_32(ctx->ejtag_info, &data);
+
+	/* Clear the access pending bit (let the processor eat!) */
+	ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
+	mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_CONTROL, NULL);
+	mips_ejtag_drscan_32(ctx->ejtag_info, &ctrl);
+	
+	return ERROR_OK;
+}
+
+static int mips32_pracc_exec_write(mips32_pracc_context *ctx, u32 address)
+{
+	u32 ctrl,data;
+	int offset;
+	
+	mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_DATA, NULL);
+	mips_ejtag_drscan_32(ctx->ejtag_info, &data);
+	
+	/* Clear access pending bit */
+	ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
+	mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_CONTROL, NULL);
+	mips_ejtag_drscan_32(ctx->ejtag_info, &ctrl);
+	
+	if ((address >= MIPS32_PRACC_PARAM_IN)
+		&& (address <= MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4))
+	{
+		offset = (address - MIPS32_PRACC_PARAM_IN) / 4;
+		ctx->local_iparam[offset] = data;
+	}
+	else if ((address >= MIPS32_PRACC_PARAM_OUT )
+		&& (address <= MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4))
+	{
+		offset = (address - MIPS32_PRACC_PARAM_OUT) / 4;
+		ctx->local_oparam[offset] = data;
+	}
+	else if (address == MIPS32_PRACC_STACK)
+	{
+		/* save data onto our stack */
+		ctx->stack[ctx->stack_offset++] = data;
+	}
+	else
+	{
+		LOG_ERROR("Error writing unexpected address");
+		return ERROR_JTAG_DEVICE_ERROR;
+	}
+	
+	return ERROR_OK;
+}
+
+int mips32_pracc_exec( mips_ejtag_t *ejtag_info, int code_len, u32 *code, int num_param_in, u32 *param_in, int num_param_out, u32 *param_out, int cycle)
+{
+	u32 ctrl;
+	u32 address, data;
+	mips32_pracc_context ctx;
+	int retval;
+	int pass = 0;
+	
+	ctx.local_iparam = param_in;
+	ctx.local_oparam = param_out;
+	ctx.num_iparam = num_param_in;
+	ctx.num_oparam = num_param_out;
+	ctx.code = code;
+	ctx.code_len = code_len;
+	ctx.ejtag_info = ejtag_info;
+	ctx.stack_offset = 0;
+	
+	while (1)
+	{
+		if ((retval = wait_for_pracc_rw(ejtag_info, &ctrl)) != ERROR_OK)
+			return retval;
+		
+		address = data = 0;
+		mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
+		mips_ejtag_drscan_32(ejtag_info, &address);
+		
+		/* Check for read or write */
+		if (ctrl & EJTAG_CTRL_PRNW)
+		{
+			if ((retval = mips32_pracc_exec_write(&ctx, address)) != ERROR_OK)
+				return retval;
+		}
+		else
+		{
+			/* Check to see if its reading at the debug vector. The first pass through
+			 * the module is always read at the vector, so the first one we allow.  When
+			 * the second read from the vector occurs we are done and just exit. */
+			if ((address == MIPS32_PRACC_TEXT) && (pass++))
+			{
+				break;
+			}
+			
+			if ((retval = mips32_pracc_exec_read(&ctx, address)) != ERROR_OK)
+				return retval;
+		}
+		
+		if (cycle == 0)
+			break;
+	}
+	
+	/* stack sanity check */
+	if (ctx.stack_offset != 0)
+	{
+		LOG_DEBUG("Pracc Stack not zero");
+	}
+	
+	return ERROR_OK;
+}
+
+int mips32_pracc_read_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int count, void *buf)
+{
+	switch (size)
+	{
+		case 1:
+			return mips32_pracc_read_mem8(ejtag_info, addr, count, (u8*)buf);
+		case 2:
+			return mips32_pracc_read_mem16(ejtag_info, addr, count, (u16*)buf);
+		case 4:
+			return mips32_pracc_read_mem32(ejtag_info, addr, count, (u32*)buf);
+	}
+	
+	return ERROR_OK;
+}
+
+int mips32_pracc_read_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf)
+{	
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_SW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_SW(11,0,15), 								/* sw $10,($15) */
+			
+		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_PARAM_IN)),		/* $8 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(9,0,8),									/* $9=mem[$8]; read addr */
+		MIPS32_LW(10,4,8),									/* $10=mem[$8+4]; read count */
+		MIPS32_LUI(11,UPPER16(MIPS32_PRACC_PARAM_OUT)), 	/* $11=MIPS32_PRACC_PARAM_OUT */
+		MIPS32_ORI(11,11,LOWER16(MIPS32_PRACC_PARAM_OUT)),
+		MIPS32_NOP,
+															/* loop: */
+		MIPS32_BEQ(0,10,9),									/* beq 0, $10, end */
+		MIPS32_NOP,
+		
+		MIPS32_LW(12,0,9), 									/* lw $12,0($9), Load $12 with the word @mem[$9] */
+		MIPS32_SW(12,0,11), 								/* sw $12,0($11) */
+		
+		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
+		MIPS32_ADDI(9,9,4), 								/* $1+=4 */
+		MIPS32_ADDI(11,11,4), 								/* $11+=4 */
+		
+		MIPS32_NOP,
+		MIPS32_B(NEG16(9)),									/* b loop */
+		MIPS32_NOP,
+															/* end: */
+		MIPS32_LW(11,0,15), 								/* sw $11,($15) */
+		MIPS32_LW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_LW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(31)),								/* b start */
+		MIPS32_NOP,
+	};
+	
+	int retval;
+	int blocksize;
+	int bytesread;
+	u32 param_in[2];
+	
+	bytesread = 0;
+	
+	while (count > 0)
+	{	
+		blocksize = count;
+		if (count > 0x400)
+			blocksize = 0x400;
+		
+		param_in[0] = addr;
+		param_in[1] = blocksize;
+		
+		if ((retval = mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+			sizeof(param_in)/sizeof(param_in[0]), param_in, blocksize, &buf[bytesread], 1)) != ERROR_OK)
+			return retval;
+		
+		count -= blocksize;
+		addr += blocksize;
+		bytesread += blocksize;
+	}
+
+	return retval;
+}
+
+int mips32_pracc_read_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf)
+{
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_SW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_SW(11,0,15), 								/* sw $10,($15) */
+			
+		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_PARAM_IN)),		/* $8 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(9,0,8),									/* $9=mem[$8]; read addr */
+		MIPS32_LW(10,4,8),									/* $10=mem[$8+4]; read count */
+		MIPS32_LUI(11,UPPER16(MIPS32_PRACC_PARAM_OUT)),		/* $11=MIPS32_PRACC_PARAM_OUT */
+		MIPS32_ORI(11,11,LOWER16(MIPS32_PRACC_PARAM_OUT)),
+		MIPS32_NOP,
+															/* loop: */
+		MIPS32_BEQ(0,10,9), 								/* beq 0, $10, end */
+		MIPS32_NOP,
+		
+		MIPS32_LHU(12,0,9), 								/* lw $12,0($9), Load $12 with the halfword @mem[$9] */
+		MIPS32_SW(12,0,11), 								/* sw $12,0($11) */
+		
+		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
+		MIPS32_ADDI(9,9,2), 								/* $9+=2 */
+		MIPS32_ADDI(11,11,4), 								/* $11+=4 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(9)),									/* b loop */
+		MIPS32_NOP,
+
+		MIPS32_LW(11,0,15), 								/* sw $11,($15) */
+		MIPS32_LW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_LW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(31)),								/* b start */
+		MIPS32_NOP,
+	};
+
+//	/* TODO remove array */
+	u32 param_out[count];
+	int i;
+	
+//	int retval;
+	int blocksize;
+	int bytesread;
+	u32 param_in[2];
+	
+	bytesread = 0;
+	
+	//while (count > 0)
+	{	
+		blocksize = count;
+		if (count > 0x400)
+			blocksize = 0x400;
+		
+		param_in[0] = addr;
+		param_in[1] = blocksize;
+		
+		mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+			sizeof(param_in)/sizeof(param_in[0]), param_in, count, param_out, 1);
+		
+//		count -= blocksize;
+//		addr += blocksize;
+//		bytesread += blocksize;
+	}
+	
+	for (i = 0; i < count; i++)
+	{
+		buf[i] = param_out[i];
+	}
+	
+	return ERROR_OK;
+}
+
+int mips32_pracc_read_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf)
+{
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_SW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_SW(11,0,15), 								/* sw $10,($15) */
+			
+		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_PARAM_IN)), 		/* $8 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(9,0,8), 									/* $9=mem[$8]; read addr */
+		MIPS32_LW(10,4,8), 									/* $10=mem[$8+4]; read count */
+		MIPS32_LUI(11,UPPER16(MIPS32_PRACC_PARAM_OUT)), 	/* $11=MIPS32_PRACC_PARAM_OUT */
+		MIPS32_ORI(11,11,LOWER16(MIPS32_PRACC_PARAM_OUT)),
+		MIPS32_NOP,
+															/* loop: */
+		MIPS32_BEQ(0,10,9), 								/* beq 0, $10, end */
+		MIPS32_NOP,
+		
+		MIPS32_LBU(12,0,9), 								/* lw $12,0($9), Load t4 with the byte @mem[t1] */
+		MIPS32_SW(12,0,11), 								/* sw $12,0($11) */
+		
+		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
+		MIPS32_ADDI(9,9,1), 								/* $9+=1 */
+		MIPS32_ADDI(11,11,4), 								/* $11+=4 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(9)),									/* b loop */
+		MIPS32_NOP,
+															/* end: */
+		MIPS32_LW(11,0,15), 								/* sw $11,($15) */
+		MIPS32_LW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_LW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(31)),								/* b start */
+		MIPS32_NOP,
+	};
+	
+//	/* TODO remove array */
+	u32 param_out[count];
+	int i;
+	
+//	int retval;
+	int blocksize;
+	int bytesread;
+	u32 param_in[2];
+	
+	bytesread = 0;
+	
+//	while (count > 0)
+	{	
+		blocksize = count;
+		if (count > 0x400)
+			blocksize = 0x400;
+		
+		param_in[0] = addr;
+		param_in[1] = blocksize;
+		
+		mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+			sizeof(param_in)/sizeof(param_in[0]), param_in, count, param_out, 1);
+		
+//		count -= blocksize;
+//		addr += blocksize;
+//		bytesread += blocksize;
+	}
+	
+	for (i = 0; i < count; i++)
+	{
+		buf[i] = param_out[i];
+	}
+
+	return ERROR_OK;
+}
+
+int mips32_pracc_write_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int count, void *buf)
+{
+	switch (size)
+	{
+		case 1:
+			return mips32_pracc_write_mem8(ejtag_info, addr, count, (u8*)buf);
+		case 2:
+			return mips32_pracc_write_mem16(ejtag_info, addr, count,(u16*)buf);
+		case 4:
+			return mips32_pracc_write_mem32(ejtag_info, addr, count, (u32*)buf);
+	}
+	
+	return ERROR_OK;
+}
+
+int mips32_pracc_write_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf)
+{
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_SW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_SW(11,0,15), 								/* sw $10,($15) */
+		
+		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_PARAM_IN)), 		/* $8 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(9,0,8), 									/* Load write addr to $9 */
+		MIPS32_LW(10,4,8), 									/* Load write count to $10 */
+		MIPS32_ADDI(8,8,8), 								/* $8+=8 */
+		MIPS32_NOP,
+															/* loop: */
+		MIPS32_BEQ(0,10,9),									/* beq $0, $10, end */
+		MIPS32_NOP,
+		
+		MIPS32_LW(11,0,8), 									/* lw $11,0($8), Load $11 with the word @mem[$8] */
+		MIPS32_SW(11,0,9), 									/* sw $11,0($9) */
+		
+		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
+		MIPS32_ADDI(9,9,4), 								/* $9+=4 */
+		MIPS32_ADDI(8,8,4), 								/* $8+=4 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(9)),									/* b loop */
+		MIPS32_NOP,
+															/* end: */
+		MIPS32_LW(11,0,15), 								/* sw $11,($15) */
+		MIPS32_LW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_LW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(30)),								/* b start */
+		MIPS32_NOP,
+	};
+	
+	/* TODO remove array */
+	u32 param_in[count+2];
+	param_in[0] = addr;
+	param_in[1] = count;
+	
+	memcpy(&param_in[2], buf, count * sizeof(u32));
+	
+	mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		sizeof(param_in)/sizeof(param_in[0]),param_in, 0, NULL, 1);
+
+	return ERROR_OK;
+}
+
+int mips32_pracc_write_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf)
+{
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_SW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_SW(11,0,15), 								/* sw $10,($15) */
+		
+		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_PARAM_IN)), 		/* $8 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(9,0,8), 									/* Load write addr to $9 */
+		MIPS32_LW(10,4,8), 									/* Load write count to $10 */
+		MIPS32_ADDI(8,8,8), 								/* $8+=8 */
+		MIPS32_NOP,
+															/* loop: */
+		MIPS32_BEQ(0,10,9),									/* beq $0, $10, end */
+		MIPS32_NOP,
+		
+		MIPS32_LW(11,0,8), 									/* lw $11,0($8), Load $11 with the word @mem[$8] */
+		MIPS32_SH(11,0,9), 									/* sh $11,0($9) */
+		
+		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
+		MIPS32_ADDI(9,9,2), 								/* $9+=2 */
+		MIPS32_ADDI(8,8,4), 								/* $8+=4 */
+		
+		MIPS32_NOP,
+		MIPS32_B(NEG16(9)),									/* b loop */
+		MIPS32_NOP,
+															/* end: */
+		MIPS32_LW(11,0,15), 								/* sw $11,($15) */
+		MIPS32_LW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_LW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(30)),								/* b start */
+		MIPS32_NOP,
+	};
+	
+	/* TODO remove array */
+	u32 param_in[count+2];
+	int i;
+	param_in[0] = addr;
+	param_in[1] = count;
+	
+	for (i = 0; i < count; i++)
+	{
+		param_in[i+2] = buf[i];
+	}
+	
+	mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		sizeof(param_in)/sizeof(param_in[0]), param_in, 0, NULL, 1);
+
+	return ERROR_OK;
+}
+
+int mips32_pracc_write_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf)
+{
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_SW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_SW(11,0,15), 								/* sw $10,($15) */
+		
+		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_PARAM_IN)), 		/* $8 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(9,0,8), 									/* Load write addr to $9 */
+		MIPS32_LW(10,4,8), 									/* Load write count to $10 */
+		MIPS32_ADDI(8,8,8), 								/* $8+=8 */
+		MIPS32_NOP,
+															/* loop: */
+		MIPS32_BEQ(0,10,9),									/* beq $0, $10, end */
+		MIPS32_NOP,
+		
+		MIPS32_LW(11,0,8), 									/* lw $11,0($8), Load $11 with the word @mem[$8] */
+		MIPS32_SB(11,0,9), 									/* sb $11,0($9) */
+		
+		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
+		MIPS32_ADDI(9,9,1), 								/* $9+=1 */
+		MIPS32_ADDI(8,8,4), 								/* $8+=4 */
+		
+		MIPS32_NOP,
+		MIPS32_B(NEG16(9)),									/* b loop */
+		MIPS32_NOP,
+															/* end: */
+		MIPS32_LW(11,0,15), 								/* sw $11,($15) */
+		MIPS32_LW(10,0,15), 								/* sw $10,($15) */
+		MIPS32_LW(9,0,15), 									/* sw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(30)),								/* b start */
+		MIPS32_NOP,
+	};
+	
+	/* TODO remove array */
+	u32 param_in[count+2];
+	int retval;
+	int i;
+	param_in[0] = addr;
+	param_in[1] = count;
+	
+	for (i = 0; i < count; i++)
+	{
+		param_in[i+2] = buf[i];
+	}
+	
+	retval = mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		sizeof(param_in)/sizeof(param_in[0]), param_in, 0, NULL, 1);
+
+	return retval;
+}
+
+int mips32_pracc_write_regs(mips_ejtag_t *ejtag_info, u32 *regs)
+{
+	/* TODO restore all core registers */
+	
+	u32 code[] = {
+														/* start: */
+		MIPS32_MTC0(2,31,0),							/* move $2 to COP0 DeSave */
+		MIPS32_LUI(2,UPPER16(MIPS32_PRACC_PARAM_IN)), 	/* $2 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(2,2,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		/*MIPS32_LW(0,0*4,2),*/ 						/* lw $0,0*4($2) */
+		MIPS32_LW(1,1*4,2), 							/* lw $1,1*4($2) */
+		MIPS32_MFC0(2,31,0),							/* move COP0 DeSave to $2 */
+		
+		MIPS32_MTC0(1,31,0),							/* move $1 to COP0 DeSave */
+		MIPS32_LUI(1,UPPER16(MIPS32_PRACC_PARAM_IN)), 	/* $1 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(1,1,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(2,2*4,1), 							/* lw $2,2*4($1) */
+		MIPS32_LW(3,3*4,1), 							/* lw $3,3*4($1) */
+		MIPS32_LW(4,4*4,1), 							/* lw $4,4*4($1) */
+		MIPS32_LW(5,5*4,1), 							/* lw $5,5*4($1) */
+		MIPS32_LW(6,6*4,1), 							/* lw $6,6*4($1) */
+		MIPS32_LW(7,7*4,1), 							/* lw $7,7*4($1) */
+		MIPS32_LW(8,8*4,1), 							/* lw $8,8*4($1) */
+		MIPS32_LW(9,9*4,1), 							/* lw $9,9*4($1) */
+		MIPS32_LW(10,10*4,1), 							/* lw $10,10*4($1) */
+		MIPS32_LW(11,11*4,1), 							/* lw $11,11*4($1) */
+		MIPS32_LW(12,12*4,1), 							/* lw $12,12*4($1) */
+		MIPS32_LW(13,13*4,1), 							/* lw $13,13*4($1) */
+		MIPS32_LW(14,14*4,1), 							/* lw $14,14*4($1) */
+		MIPS32_LW(15,15*4,1), 							/* lw $15,15*4($1) */
+		MIPS32_LW(16,16*4,1), 							/* lw $16,16*4($1) */
+		MIPS32_LW(17,17*4,1), 							/* lw $17,17*4($1) */
+		MIPS32_LW(18,18*4,1), 							/* lw $18,18*4($1) */
+		MIPS32_LW(19,19*4,1), 							/* lw $19,19*4($1) */
+		MIPS32_LW(20,20*4,1), 							/* lw $20,20*4($1) */
+		MIPS32_LW(21,21*4,1), 							/* lw $21,21*4($1) */
+		MIPS32_LW(22,22*4,1), 							/* lw $22,22*4($1) */
+		MIPS32_LW(23,23*4,1), 							/* lw $23,23*4($1) */
+		MIPS32_LW(24,24*4,1), 							/* lw $24,24*4($1) */
+		MIPS32_LW(25,25*4,1), 							/* lw $25,25*4($1) */
+		MIPS32_LW(26,26*4,1), 							/* lw $26,26*4($1) */
+		MIPS32_LW(27,27*4,1), 							/* lw $27,27*4($1) */
+		MIPS32_LW(28,28*4,1), 							/* lw $28,28*4($1) */
+		MIPS32_LW(29,29*4,1), 							/* lw $29,29*4($1) */
+		MIPS32_LW(30,30*4,1), 							/* lw $30,30*4($1) */
+		MIPS32_LW(31,31*4,1), 							/* lw $31,31*4($1) */
+		
+		MIPS32_MFC0(1,31,0),							/* move COP0 DeSave to $1 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(41)),							/* b start */
+		MIPS32_NOP,
+	};
+	
+	int retval;
+	
+	retval = mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		32, regs, 0, NULL, 1);
+	
+	return retval;
+}
+
+int mips32_pracc_read_regs(mips_ejtag_t *ejtag_info, u32 *regs)
+{
+	u32 code[] = {
+														/* start: */
+		MIPS32_MTC0(2,31,0),							/* move $2 to COP0 DeSave */
+		MIPS32_LUI(2,UPPER16(MIPS32_PRACC_PARAM_OUT)), 	/* $2 = MIPS32_PRACC_PARAM_OUT */
+		MIPS32_ORI(2,2,LOWER16(MIPS32_PRACC_PARAM_OUT)),
+		MIPS32_SW(0,0*4,2),								/* sw $0,0*4($2) */
+		MIPS32_SW(1,1*4,2), 							/* sw $1,1*4($2) */
+		MIPS32_SW(15,15*4,2), 							/* sw $15,15*4($2) */
+		MIPS32_MFC0(2,31,0),							/* move COP0 DeSave to $2 */
+		MIPS32_MTC0(15,31,0),							/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 	/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(1,0,15), 								/* sw $1,($15) */
+		MIPS32_SW(2,0,15), 								/* sw $2,($15) */
+		MIPS32_LUI(1,UPPER16(MIPS32_PRACC_PARAM_OUT)), 	/* $1 = MIPS32_PRACC_PARAM_OUT */
+		MIPS32_ORI(1,1,LOWER16(MIPS32_PRACC_PARAM_OUT)),
+		MIPS32_SW(2,2*4,1), 							/* sw $2,2*4($1) */
+		MIPS32_SW(3,3*4,1), 							/* sw $3,3*4($1) */
+		MIPS32_SW(4,4*4,1), 							/* sw $4,4*4($1) */
+		MIPS32_SW(5,5*4,1), 							/* sw $5,5*4($1) */
+		MIPS32_SW(6,6*4,1), 							/* sw $6,6*4($1) */
+		MIPS32_SW(7,7*4,1), 							/* sw $7,7*4($1) */
+		MIPS32_SW(8,8*4,1), 							/* sw $8,8*4($1) */
+		MIPS32_SW(9,9*4,1), 							/* sw $9,9*4($1) */
+		MIPS32_SW(10,10*4,1), 							/* sw $10,10*4($1) */
+		MIPS32_SW(11,11*4,1), 							/* sw $11,11*4($1) */
+		MIPS32_SW(12,12*4,1), 							/* sw $12,12*4($1) */
+		MIPS32_SW(13,13*4,1), 							/* sw $13,13*4($1) */
+		MIPS32_SW(14,14*4,1), 							/* sw $14,14*4($1) */
+		MIPS32_SW(16,16*4,1), 							/* sw $16,16*4($1) */
+		MIPS32_SW(17,17*4,1), 							/* sw $17,17*4($1) */
+		MIPS32_SW(18,18*4,1), 							/* sw $18,18*4($1) */
+		MIPS32_SW(19,19*4,1), 							/* sw $19,19*4($1) */
+		MIPS32_SW(20,20*4,1), 							/* sw $20,20*4($1) */
+		MIPS32_SW(21,21*4,1), 							/* sw $21,21*4($1) */
+		MIPS32_SW(22,22*4,1), 							/* sw $22,22*4($1) */
+		MIPS32_SW(23,23*4,1), 							/* sw $23,23*4($1) */
+		MIPS32_SW(24,24*4,1), 							/* sw $24,24*4($1) */
+		MIPS32_SW(25,25*4,1), 							/* sw $25,25*4($1) */
+		MIPS32_SW(26,26*4,1), 							/* sw $26,26*4($1) */
+		MIPS32_SW(27,27*4,1), 							/* sw $27,27*4($1) */
+		MIPS32_SW(28,28*4,1), 							/* sw $28,28*4($1) */
+		MIPS32_SW(29,29*4,1), 							/* sw $29,29*4($1) */
+		MIPS32_SW(30,30*4,1), 							/* sw $30,30*4($1) */
+		MIPS32_SW(31,31*4,1), 							/* sw $31,31*4($1) */
+		
+		MIPS32_MFC0(2,12,0),							/* move status to $2 */
+		MIPS32_SW(2,32*4,1), 							/* sw $2,32*4($1) */
+		MIPS32_LO(2),									/* move lo to $2 */
+		MIPS32_SW(2,33*4,1), 							/* sw $2,33*4($1) */
+		MIPS32_HI(2),									/* move hi to $2 */
+		MIPS32_SW(2,34*4,1), 							/* sw $2,34*4($1) */
+		MIPS32_MFC0(2,8,0),								/* move badvaddr to $2 */
+		MIPS32_SW(2,35*4,1), 							/* sw $2,35*4($1) */
+		MIPS32_MFC0(2,13,0),							/* move cause to $2 */
+		MIPS32_SW(2,36*4,1), 							/* sw $2,36*4($1) */
+		MIPS32_MFC0(2,24,0),							/* move pc to $2 */
+		MIPS32_SW(2,37*4,1), 							/* sw $2,37*4($1) */
+		
+		MIPS32_LW(2,0,15), 								/* sw $2,($15) */
+		MIPS32_LW(1,0,15), 								/* sw $1,($15) */
+		MIPS32_MFC0(15,31,0),							/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(60)),							/* b start */
+		MIPS32_NOP,
+	};
+	
+	int retval;
+	
+	retval = mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		0, NULL, 38, regs, 1);
+	
+	return retval;
+}
diff --git a/src/target/mips32_pracc.h b/src/target/mips32_pracc.h
new file mode 100644
index 00000000..5cda497d
--- /dev/null
+++ b/src/target/mips32_pracc.h
@@ -0,0 +1,55 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifndef MIPS32_PRACC_H
+#define MIPS32_PRACC_H
+
+#include "mips_ejtag.h"
+
+#define MIPS32_PRACC_TEXT			0xFF200200
+#define MIPS32_PRACC_STACK			0xFF2FFFFC
+#define MIPS32_PRACC_PARAM_IN		0xFF201000
+#define MIPS32_PRACC_PARAM_IN_SIZE	0x1000
+#define MIPS32_PRACC_PARAM_OUT		(MIPS32_PRACC_PARAM_IN + MIPS32_PRACC_PARAM_IN_SIZE)
+#define MIPS32_PRACC_PARAM_OUT_SIZE	0x1000
+
+#define UPPER16(u32) (u32 >> 16)
+#define LOWER16(u32) (u32 & 0xFFFF)
+#define NEG16(v) (((~(v)) + 1) & 0xFFFF)
+//#define NEG18(v) ( ((~(v)) + 1) & 0x3FFFF )
+
+extern int mips32_pracc_read_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int count, void *buf);
+extern int mips32_pracc_write_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int count, void *buf);
+
+extern int mips32_pracc_read_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf);
+extern int mips32_pracc_read_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf);
+extern int mips32_pracc_read_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf);
+
+extern int mips32_pracc_write_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf);
+extern int mips32_pracc_write_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf);
+extern int mips32_pracc_write_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf);
+
+extern int mips32_pracc_read_regs(mips_ejtag_t *ejtag_info, u32 *regs);
+extern int mips32_pracc_write_regs(mips_ejtag_t *ejtag_info, u32 *regs);
+
+extern int mips32_pracc_exec( mips_ejtag_t *ejtag_info, int code_len, u32 *code, int num_param_in, u32 *param_in, int num_param_out, u32 *param_out, int cycle);
+
+#endif
diff --git a/src/target/mips_ejtag.c b/src/target/mips_ejtag.c
new file mode 100644
index 00000000..d2203685
--- /dev/null
+++ b/src/target/mips_ejtag.c
@@ -0,0 +1,283 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "mips32.h"
+#include "mips_ejtag.h"
+
+#include "binarybuffer.h"
+#include "log.h"
+#include "jtag.h"
+
+#include <stdlib.h>
+
+int mips_ejtag_set_instr(mips_ejtag_t *ejtag_info, int new_instr, in_handler_t handler)
+{
+	jtag_device_t *device = jtag_get_device(ejtag_info->chain_pos);
+	
+	if (buf_get_u32(device->cur_instr, 0, device->ir_length) != new_instr)
+	{
+		scan_field_t field;
+		u8 t[4];
+		
+		field.device = ejtag_info->chain_pos;
+		field.num_bits = device->ir_length;
+		field.out_value = t;
+		buf_set_u32(field.out_value, 0, field.num_bits, new_instr);
+		field.out_mask = NULL;
+		field.in_value = NULL;
+		field.in_check_value = NULL;
+		field.in_check_mask = NULL;
+		field.in_handler = handler;
+		field.in_handler_priv = NULL;
+		jtag_add_ir_scan(1, &field, -1);
+	}
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_get_idcode(mips_ejtag_t *ejtag_info, u32 *idcode, in_handler_t handler)
+{
+	scan_field_t field;
+	
+	jtag_add_end_state(TAP_RTI);
+	
+	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IDCODE, NULL);
+	
+	field.device = ejtag_info->chain_pos;
+	field.num_bits = 32;
+	field.out_value = NULL;
+	field.out_mask = NULL;
+	field.in_value = (void*)idcode;
+	field.in_check_value = NULL;
+	field.in_check_mask = NULL;
+	field.in_handler = NULL;
+	field.in_handler_priv = NULL;
+	jtag_add_dr_scan(1, &field, -1);
+	
+	if (jtag_execute_queue() != ERROR_OK)
+	{
+		LOG_ERROR("register read failed");
+	}
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_get_impcode(mips_ejtag_t *ejtag_info, u32 *impcode, in_handler_t handler)
+{
+	scan_field_t field;
+	
+	jtag_add_end_state(TAP_RTI);
+	
+	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IMPCODE, NULL);
+	
+	field.device = ejtag_info->chain_pos;
+	field.num_bits = 32;
+	field.out_value = NULL;
+	field.out_mask = NULL;
+	field.in_value = (void*)impcode;
+	field.in_check_value = NULL;
+	field.in_check_mask = NULL;
+	field.in_handler = NULL;
+	field.in_handler_priv = NULL;
+	jtag_add_dr_scan(1, &field, -1);
+	
+	if (jtag_execute_queue() != ERROR_OK)
+	{
+		LOG_ERROR("register read failed");
+	}
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_drscan_32(mips_ejtag_t *ejtag_info, u32 *data)
+{
+	jtag_device_t *device;
+	device = jtag_get_device(ejtag_info->chain_pos);
+	scan_field_t field;
+	u8 t[4];
+	int retval;
+	
+	field.device = ejtag_info->chain_pos;
+	field.num_bits = 32;
+	field.out_value = t;
+	buf_set_u32(field.out_value, 0, field.num_bits, *data);
+	field.out_mask = NULL;
+	field.in_value = (u8*)data;
+	field.in_check_value = NULL;
+	field.in_check_mask = NULL;
+	field.in_handler = NULL;
+	field.in_handler_priv = NULL;
+	jtag_add_dr_scan(1, &field, -1);
+	
+	if ((retval = jtag_execute_queue()) != ERROR_OK)
+	{
+		LOG_ERROR("register read failed");
+		return retval;
+	}
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_step_enable(mips_ejtag_t *ejtag_info)
+{	
+	u32 code[] = {
+			MIPS32_MTC0(1,31,0),			/* move $1 to COP0 DeSave */
+			MIPS32_MFC0(1,23,0),			/* move COP0 Debug to $1 */
+			MIPS32_ORI(1,1,0x0100),			/* set SSt bit in debug reg */
+			MIPS32_MTC0(1,23,0),			/* move $1 to COP0 Debug */
+			MIPS32_MFC0(1,31,0),			/* move COP0 DeSave to $1 */
+			MIPS32_NOP,
+			MIPS32_B(NEG16(7)),
+			MIPS32_NOP,
+	};
+	
+	mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		0, NULL, 0, NULL, 1);
+	
+	return ERROR_OK;
+}
+int mips_ejtag_step_disable(mips_ejtag_t *ejtag_info)
+{
+	u32 code[] = {
+			MIPS32_MTC0(15,31,0),							/* move $15 to COP0 DeSave */
+			MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 	/* $15 = MIPS32_PRACC_STACK */
+			MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+			MIPS32_SW(1,0,15), 								/* sw $2,($15) */
+			MIPS32_SW(2,0,15), 								/* sw $3,($15) */
+			MIPS32_MFC0(1,23,0),							/* move COP0 Debug to $1 */
+			MIPS32_LUI(2,0xFFFF), 							/* $2 = 0xfffffeff */
+			MIPS32_ORI(2,2,0xFEFF),
+			MIPS32_AND(1,1,2),
+			MIPS32_MTC0(1,23,0),							/* move $1 to COP0 Debug */
+			MIPS32_LW(2,0,15),
+			MIPS32_LW(1,0,15),
+			MIPS32_MFC0(15,31,0),							/* move COP0 DeSave to $15 */
+			MIPS32_NOP,
+			MIPS32_B(NEG16(15)),
+			MIPS32_NOP,
+	};
+	
+	mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		0, NULL, 0, NULL, 1);
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_config_step(mips_ejtag_t *ejtag_info, int enable_step)
+{	
+	if (enable_step)
+		return mips_ejtag_step_enable(ejtag_info);	
+	return mips_ejtag_step_disable(ejtag_info);
+}
+
+int mips_ejtag_enter_debug(mips_ejtag_t *ejtag_info)
+{
+	jtag_add_end_state(TAP_RTI);
+	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
+	
+	/* set debug break bit */
+	ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV | EJTAG_CTRL_JTAGBRK;
+	mips_ejtag_drscan_32(ejtag_info, &ejtag_info->ejtag_ctrl);
+	
+	/* break bit will be cleared by hardware */
+	ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
+	mips_ejtag_drscan_32(ejtag_info, &ejtag_info->ejtag_ctrl);
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_exit_debug(mips_ejtag_t *ejtag_info, int enable_interrupts)
+{
+	u32 inst;
+	inst = MIPS32_DRET;
+	
+	/* TODO : enable/disable interrrupts */
+	
+	/* execute our dret instruction */
+	mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_read_debug(mips_ejtag_t *ejtag_info, u32* debug_reg)
+{
+	u32 code[] = {
+			MIPS32_MTC0(15,31,0),							/* move $15 to COP0 DeSave */
+			MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 	/* $15 = MIPS32_PRACC_STACK */
+			MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+			MIPS32_SW(1,0,15), 								/* sw $1,($15) */
+			MIPS32_SW(2,0,15), 								/* sw $2,($15) */
+			MIPS32_LUI(1,UPPER16(MIPS32_PRACC_PARAM_OUT)), 	/* $1 = MIPS32_PRACC_PARAM_OUT */
+			MIPS32_ORI(1,1,LOWER16(MIPS32_PRACC_PARAM_OUT)),
+			MIPS32_MFC0(2,23,0),							/* move COP0 Debug to $1 */
+			MIPS32_SW(2,0,1),
+			MIPS32_LW(2,0,15),
+			MIPS32_LW(1,0,15),
+			MIPS32_MFC0(15,31,0),							/* move COP0 DeSave to $15 */
+			MIPS32_NOP,
+			MIPS32_B(NEG16(14)),
+			MIPS32_NOP,
+	};
+	
+	mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		0, NULL, 1, debug_reg, 1);
+	
+	return ERROR_OK;
+}
+
+int mips_ejtag_init(mips_ejtag_t *ejtag_info)
+{
+	u32 ejtag_version;
+	
+	mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode, NULL);
+	LOG_DEBUG("impcode: 0x%8.8x", ejtag_info->impcode);
+	
+	/* get ejtag version */
+	ejtag_version = ((ejtag_info->impcode >> 29) & 0x07);
+	
+	switch (ejtag_version)
+	{
+		case 0:
+			LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
+			break;
+		case 1:
+			LOG_DEBUG("EJTAG: Version 2.5 Detected");
+			break;
+		case 2:
+			LOG_DEBUG("EJTAG: Version 2.6 Detected");
+			break;
+		case 3:
+			LOG_DEBUG("EJTAG: Version 3.1 Detected");
+			break;
+		default:
+			LOG_DEBUG("EJTAG: Unknown Version Detected");
+			break;
+	}
+	
+	/* set initial state for ejtag control reg */
+	ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
+	
+	return ERROR_OK;
+}
diff --git a/src/target/mips_ejtag.h b/src/target/mips_ejtag.h
new file mode 100644
index 00000000..b25bd026
--- /dev/null
+++ b/src/target/mips_ejtag.h
@@ -0,0 +1,107 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#ifndef MIPS_EJTAG
+#define MIPS_EJTAG
+
+#include "types.h"
+#include "jtag.h"
+
+#define EJTAG_INST_IDCODE		0x01
+#define EJTAG_INST_IMPCODE		0x03
+#define EJTAG_INST_ADDRESS		0x08
+#define EJTAG_INST_DATA			0x09
+#define EJTAG_INST_CONTROL		0x0A
+#define EJTAG_INST_ALL			0x0B
+#define EJTAG_INST_EJTAGBOOT	0x0C
+#define EJTAG_INST_NORMALBOOT	0x0D
+#define EJTAG_INST_FASTDATA		0x0E
+#define EJTAG_INST_TCBCONTROLA	0x10
+#define EJTAG_INST_TCBCONTROLB	0x11
+#define EJTAG_INST_TCBDATA		0x12
+#define EJTAG_INST_BYPASS		0x1F
+
+#define EJTAG_CTRL_TOF			(1 << 1)
+#define EJTAG_CTRL_TIF			(1 << 2)
+#define EJTAG_CTRL_BRKST		(1 << 3)
+#define EJTAG_CTRL_DLOCK		(1 << 5)
+#define EJTAG_CTRL_DRWN			(1 << 9)
+#define EJTAG_CTRL_DERR			(1 << 10)
+#define EJTAG_CTRL_DSTRT		(1 << 11)
+#define EJTAG_CTRL_JTAGBRK		(1 << 12)
+#define EJTAG_CTRL_SETDEV		(1 << 14)
+#define EJTAG_CTRL_PROBEN		(1 << 15)
+#define EJTAG_CTRL_PRRST		(1 << 16)
+#define EJTAG_CTRL_DMAACC		(1 << 17)
+#define EJTAG_CTRL_PRACC		(1 << 18)
+#define EJTAG_CTRL_PRNW			(1 << 19)
+#define EJTAG_CTRL_PERRST		(1 << 20)
+#define EJTAG_CTRL_SYNC			(1 << 23)
+#define EJTAG_CTRL_DNM			(1 << 28)
+#define EJTAG_CTRL_ROCC			(1 << 31)
+
+/* Debug Register (CP0 Register 23, Select 0) */
+
+#define EJTAG_DEBUG_DSS			(1 << 0)
+#define EJTAG_DEBUG_DBP			(1 << 1)
+#define EJTAG_DEBUG_DDBL		(1 << 2)
+#define EJTAG_DEBUG_DDBS		(1 << 3)
+#define EJTAG_DEBUG_DIB			(1 << 4)
+#define EJTAG_DEBUG_DINT		(1 << 5)
+#define EJTAG_DEBUG_OFFLINE		(1 << 7)
+#define EJTAG_DEBUG_SST			(1 << 8)
+#define EJTAG_DEBUG_NOSST		(1 << 9)
+#define EJTAG_DEBUG_DDBLIMPR	(1 << 18)
+#define EJTAG_DEBUG_DDBSIMPR	(1 << 19)
+#define EJTAG_DEBUG_IEXI		(1 << 20)
+#define EJTAG_DEBUG_DBUSEP		(1 << 21)
+#define EJTAG_DEBUG_CACHEEP		(1 << 22)
+#define EJTAG_DEBUG_MCHECKP		(1 << 23)
+#define EJTAG_DEBUG_IBUSEP		(1 << 24)
+#define EJTAG_DEBUG_COUNTDM		(1 << 25)
+#define EJTAG_DEBUG_HALT		(1 << 26)
+#define EJTAG_DEBUG_DOZE		(1 << 27)
+#define EJTAG_DEBUG_LSNM		(1 << 28)
+#define EJTAG_DEBUG_NODCR		(1 << 29)
+#define EJTAG_DEBUG_DM			(1 << 30)
+#define EJTAG_DEBUG_DBD			(1 << 31)
+
+typedef struct mips_ejtag_s
+{
+	int chain_pos;
+	u32 impcode;
+//	int use_dma;
+	u32 ejtag_ctrl;
+} mips_ejtag_t;
+
+extern int mips_ejtag_set_instr(mips_ejtag_t *ejtag_info, int new_instr, in_handler_t handler);
+extern int mips_ejtag_enter_debug(mips_ejtag_t *ejtag_info);
+extern int mips_ejtag_exit_debug(mips_ejtag_t *ejtag_info, int enable_interrupts);
+extern int mips_ejtag_get_impcode(mips_ejtag_t *ejtag_info, u32 *impcode, in_handler_t handler);
+extern int mips_ejtag_get_idcode(mips_ejtag_t *ejtag_info, u32 *idcode, in_handler_t handler);
+extern int mips_ejtag_drscan_32(mips_ejtag_t *ejtag_info, u32 *data);
+
+extern int mips_ejtag_init(mips_ejtag_t *ejtag_info);
+extern int mips_ejtag_config_step(mips_ejtag_t *ejtag_info, int enable_step);
+extern int mips_ejtag_read_debug(mips_ejtag_t *ejtag_info, u32* debug_reg);
+
+#endif /* MIPS_EJTAG */
diff --git a/src/target/mips_m4k.c b/src/target/mips_m4k.c
new file mode 100644
index 00000000..8695a626
--- /dev/null
+++ b/src/target/mips_m4k.c
@@ -0,0 +1,642 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "mips32.h"
+#include "mips_m4k.h"
+#include "jtag.h"
+#include "log.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+/* cli handling */
+
+/* forward declarations */
+int mips_m4k_poll(target_t *target);
+int mips_m4k_halt(struct target_s *target);
+int mips_m4k_soft_reset_halt(struct target_s *target);
+int mips_m4k_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution);
+int mips_m4k_step(struct target_s *target, int current, u32 address, int handle_breakpoints);
+int mips_m4k_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer);
+int mips_m4k_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer);
+int mips_m4k_register_commands(struct command_context_s *cmd_ctx);
+int mips_m4k_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
+int mips_m4k_quit();
+int mips_m4k_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target);
+
+int mips_m4k_examine(struct command_context_s *cmd_ctx, struct target_s *target);
+int mips_m4k_assert_reset(target_t *target);
+int mips_m4k_deassert_reset(target_t *target);
+
+target_type_t mips_m4k_target =
+{
+	.name = "mips_m4k",
+
+	.poll = mips_m4k_poll,
+	.arch_state = mips32_arch_state,
+
+	.target_request_data = NULL,
+
+	.halt = mips_m4k_halt,
+	.resume = mips_m4k_resume,
+	.step = mips_m4k_step,
+
+	.assert_reset = mips_m4k_assert_reset,
+	.deassert_reset = mips_m4k_deassert_reset,
+	.soft_reset_halt = mips_m4k_soft_reset_halt,
+	
+	.get_gdb_reg_list = mips32_get_gdb_reg_list,
+
+	.read_memory = mips_m4k_read_memory,
+	.write_memory = mips_m4k_write_memory,
+	.bulk_write_memory = mips_m4k_bulk_write_memory,
+	.checksum_memory = NULL,
+	.blank_check_memory = NULL,
+	
+	.run_algorithm = mips32_run_algorithm,
+
+	.add_breakpoint = mips_m4k_add_breakpoint,
+	.remove_breakpoint = mips_m4k_remove_breakpoint,
+	.add_watchpoint = mips_m4k_add_watchpoint,
+	.remove_watchpoint = mips_m4k_remove_watchpoint,
+
+	.register_commands = mips_m4k_register_commands,
+	.target_command = mips_m4k_target_command,
+	.init_target = mips_m4k_init_target,
+	.examine = mips_m4k_examine,
+	.quit = mips_m4k_quit
+};
+
+int mips_m4k_debug_entry(target_t *target)
+{
+	u32 debug_reg;
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	/* read debug register */
+	mips_ejtag_read_debug(ejtag_info, &debug_reg);
+	
+	if ((target->debug_reason != DBG_REASON_DBGRQ)
+		&& (target->debug_reason != DBG_REASON_SINGLESTEP))
+	{
+//		if (cortex_m3->nvic_dfsr & DFSR_BKPT)
+//		{
+//			target->debug_reason = DBG_REASON_BREAKPOINT;
+//			if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
+//				target->debug_reason = DBG_REASON_WPTANDBKPT;
+//		}
+//		else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
+//			target->debug_reason = DBG_REASON_WATCHPOINT;
+	}
+	
+	if (debug_reg & EJTAG_DEBUG_DSS)
+	{
+		/* stopped due to single step - clear step bit */
+		mips_ejtag_config_step(ejtag_info, 0);
+	}
+	
+	mips32_save_context(target);
+	
+	LOG_DEBUG("entered debug state at PC 0x%x, target->state: %s", \
+		*(u32*)(mips32->core_cache->reg_list[MIPS32_PC].value), target_state_strings[target->state]);
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_poll(target_t *target)
+{
+	int retval;
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	/* read ejtag control reg */
+	jtag_add_end_state(TAP_RTI);
+	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
+	mips_ejtag_drscan_32(ejtag_info, &ejtag_info->ejtag_ctrl);
+	
+	if (ejtag_info->ejtag_ctrl & EJTAG_CTRL_BRKST)
+	{
+		if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
+		{
+			jtag_add_end_state(TAP_RTI);
+			mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
+			
+			target->state = TARGET_HALTED;
+			
+			if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
+				return retval;
+			
+			target_call_event_callbacks(target, TARGET_EVENT_HALTED);
+		}
+		else if (target->state == TARGET_DEBUG_RUNNING)
+		{
+			target->state = TARGET_HALTED;
+			
+			if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
+				return retval;
+			
+			target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
+		}
+	}
+	else
+	{
+		target->state = TARGET_RUNNING;
+	}
+	
+	if (ejtag_info->ejtag_ctrl & EJTAG_CTRL_ROCC)
+	{
+		/* we have detected a reset, clear flag
+		 * otherwise ejtag will not work */
+		jtag_add_end_state(TAP_RTI);
+		ejtag_info->ejtag_ctrl &= ~EJTAG_CTRL_ROCC;
+		
+		mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
+		mips_ejtag_drscan_32(ejtag_info, &ejtag_info->ejtag_ctrl);
+		LOG_DEBUG("Reset Detected");
+	}
+	
+//	LOG_DEBUG("ctrl=0x%08X", ejtag_info->ejtag_ctrl);
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_halt(struct target_s *target)
+{
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
+	
+	if (target->state == TARGET_HALTED)
+	{
+		LOG_DEBUG("target was already halted");
+		return ERROR_OK;
+	}
+	
+	if (target->state == TARGET_UNKNOWN)
+	{
+		LOG_WARNING("target was in unknown state when halt was requested");
+	}
+	
+	if (target->state == TARGET_RESET) 
+	{
+		if ((jtag_reset_config & RESET_SRST_PULLS_TRST) && jtag_srst)
+		{
+			LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
+			return ERROR_TARGET_FAILURE;
+		}
+		else
+		{
+			/* we came here in a reset_halt or reset_init sequence
+			 * debug entry was already prepared in mips32_prepare_reset_halt()
+			 */
+			target->debug_reason = DBG_REASON_DBGRQ;
+			
+			return ERROR_OK;
+		}
+	}
+	
+	/* break processor */
+	mips_ejtag_enter_debug(ejtag_info);
+	
+	target->debug_reason = DBG_REASON_DBGRQ;
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_assert_reset(target_t *target)
+{
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
+	
+	if (!(jtag_reset_config & RESET_HAS_SRST))
+	{
+		LOG_ERROR("Can't assert SRST");
+		return ERROR_FAIL;
+	}
+	
+	if (target->reset_halt)
+	{
+		/* use hardware to catch reset */
+		jtag_add_end_state(TAP_RTI);
+		mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT, NULL);
+	}
+	else
+	{
+		jtag_add_end_state(TAP_RTI);
+		mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
+	}
+	
+	/* here we should issue a srst only, but we may have to assert trst as well */
+	if (jtag_reset_config & RESET_SRST_PULLS_TRST)
+	{
+		jtag_add_reset(1, 1);
+	}
+	else
+	{
+		jtag_add_reset(0, 1);
+	}
+	
+	target->state = TARGET_RESET;
+	jtag_add_sleep(50000);
+
+	mips32_invalidate_core_regs(target);
+
+	return ERROR_OK;
+}
+
+int mips_m4k_deassert_reset(target_t *target)
+{
+	LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
+	
+	/* deassert reset lines */
+	jtag_add_reset(0, 0);
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_soft_reset_halt(struct target_s *target)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution)
+{
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	breakpoint_t *breakpoint = NULL;
+	u32 resume_pc;
+	
+	if (target->state != TARGET_HALTED)
+	{
+		LOG_WARNING("target not halted");
+		return ERROR_TARGET_NOT_HALTED;
+	}
+	
+	if (!debug_execution)
+	{
+		target_free_all_working_areas(target);
+		mips_m4k_enable_breakpoints(target);
+		mips_m4k_enable_watchpoints(target);
+	}
+	
+	/* current = 1: continue on current pc, otherwise continue at <address> */
+	if (!current) 
+	{
+		buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
+		mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
+		mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
+	}
+	
+	resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
+	
+	mips32_restore_context(target);
+	
+	/* the front-end may request us not to handle breakpoints */
+	if (handle_breakpoints)
+	{
+		/* Single step past breakpoint at current address */
+		if ((breakpoint = breakpoint_find(target, resume_pc)))
+		{
+			LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
+			mips_m4k_unset_breakpoint(target, breakpoint);
+			//mips_m4k_single_step_core(target);
+			mips_m4k_set_breakpoint(target, breakpoint);
+		}
+	}
+	
+	/* exit debug mode - enable interrupts if required */
+	mips_ejtag_exit_debug(ejtag_info, !debug_execution);
+	
+	/* registers are now invalid */
+	mips32_invalidate_core_regs(target);
+	
+	if (!debug_execution)
+	{
+		target->state = TARGET_RUNNING;
+		target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
+		LOG_DEBUG("target resumed at 0x%x", resume_pc);
+	}
+	else
+	{
+		target->state = TARGET_DEBUG_RUNNING;
+		target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
+		LOG_DEBUG("target debug resumed at 0x%x", resume_pc);
+	}
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_step(struct target_s *target, int current, u32 address, int handle_breakpoints)
+{
+	/* get pointers to arch-specific information */
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	breakpoint_t *breakpoint = NULL;
+
+	if (target->state != TARGET_HALTED)
+	{
+		LOG_WARNING("target not halted");
+		return ERROR_TARGET_NOT_HALTED;
+	}
+
+	/* current = 1: continue on current pc, otherwise continue at <address> */
+	if (!current)
+		buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
+	
+	/* the front-end may request us not to handle breakpoints */
+	if (handle_breakpoints)
+		if ((breakpoint = breakpoint_find(target, buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32))))
+			mips_m4k_unset_breakpoint(target, breakpoint);
+	
+	/* restore context */
+	mips32_restore_context(target);
+	
+	/* configure single step mode */
+	mips_ejtag_config_step(ejtag_info, 1);
+	
+	target->debug_reason = DBG_REASON_SINGLESTEP;
+	
+	target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
+	
+	/* exit debug mode */
+	mips_ejtag_exit_debug(ejtag_info, 1);
+	
+	/* registers are now invalid */
+	mips32_invalidate_core_regs(target);
+	
+	if (breakpoint)
+		mips_m4k_set_breakpoint(target, breakpoint);
+
+	LOG_DEBUG("target stepped ");
+	
+	mips_m4k_debug_entry(target);
+	target_call_event_callbacks(target, TARGET_EVENT_HALTED);
+	
+	return ERROR_OK;
+}
+
+void mips_m4k_enable_breakpoints(struct target_s *target)
+{
+	breakpoint_t *breakpoint = target->breakpoints;
+	
+	/* set any pending breakpoints */
+	while (breakpoint)
+	{
+		if (breakpoint->set == 0)
+			mips_m4k_set_breakpoint(target, breakpoint);
+		breakpoint = breakpoint->next;
+	}
+}
+
+int mips_m4k_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+int mips_m4k_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
+{
+	/* TODO */
+	return ERROR_OK;
+}
+
+void mips_m4k_enable_watchpoints(struct target_s *target)
+{
+	watchpoint_t *watchpoint = target->watchpoints;
+	
+	/* set any pending watchpoints */
+	while (watchpoint)
+	{
+		if (watchpoint->set == 0)
+			mips_m4k_set_watchpoint(target, watchpoint);
+		watchpoint = watchpoint->next;
+	}
+}
+
+int mips_m4k_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
+{
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	LOG_DEBUG("address: 0x%8.8x, size: 0x%8.8x, count: 0x%8.8x", address, size, count);
+
+	if (target->state != TARGET_HALTED)
+	{
+		LOG_WARNING("target not halted");
+		return ERROR_TARGET_NOT_HALTED;
+	}
+
+	/* sanitize arguments */
+	if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
+		return ERROR_INVALID_ARGUMENTS;
+
+	if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
+		return ERROR_TARGET_UNALIGNED_ACCESS;
+	
+	switch (size)
+	{
+		case 4:
+		case 2:
+		case 1:
+			return mips32_pracc_read_mem(ejtag_info, address, size, count, (void *)buffer);
+		default:
+			LOG_ERROR("BUG: we shouldn't get here");
+			exit(-1);
+			break;
+	}
+
+	return ERROR_OK;
+}
+
+int mips_m4k_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
+{
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	
+	LOG_DEBUG("address: 0x%8.8x, size: 0x%8.8x, count: 0x%8.8x", address, size, count);
+
+	if (target->state != TARGET_HALTED)
+	{
+		LOG_WARNING("target not halted");
+		return ERROR_TARGET_NOT_HALTED;
+	}
+
+	/* sanitize arguments */
+	if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
+		return ERROR_INVALID_ARGUMENTS;
+
+	if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
+		return ERROR_TARGET_UNALIGNED_ACCESS;
+	
+	switch (size)
+	{
+		case 4:
+		case 2:
+		case 1:
+			mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
+			break;
+		default:
+			LOG_ERROR("BUG: we shouldn't get here");
+			exit(-1);
+			break;
+	}
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_register_commands(struct command_context_s *cmd_ctx)
+{
+	int retval;
+	
+	retval = mips32_register_commands(cmd_ctx);
+	return retval;
+}
+
+int mips_m4k_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
+{
+	mips32_build_reg_cache(target);
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_quit()
+{
+	return ERROR_OK;
+}
+
+int mips_m4k_init_arch_info(target_t *target, mips_m4k_common_t *mips_m4k, int chain_pos, char *variant)
+{
+	mips32_common_t *mips32 = &mips_m4k->mips32_common;
+	
+	if (variant)
+	{
+		mips_m4k->variant = strdup(variant);
+	}
+	else
+	{
+		mips_m4k->variant = strdup("");
+	}
+	
+	mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
+	
+	/* initialize mips4k specific info */
+	mips32_init_arch_info(target, mips32, chain_pos, variant);
+	mips32->arch_info = mips_m4k;
+		
+	return ERROR_OK;
+}
+
+int mips_m4k_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
+{
+	int chain_pos;
+	char *variant = NULL;
+	mips_m4k_common_t *mips_m4k = malloc(sizeof(mips_m4k_common_t));
+	
+	if (argc < 4)
+	{
+		LOG_ERROR("'target mips4k' requires at least one additional argument");
+		exit(-1);
+	}
+	
+	chain_pos = strtoul(args[3], NULL, 0);
+	
+	if (argc >= 5)
+		variant = args[4];
+	
+	mips_m4k_init_arch_info(target, mips_m4k, chain_pos, variant);
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_examine(struct command_context_s *cmd_ctx, struct target_s *target)
+{
+	int retval;
+	mips32_common_t *mips32 = target->arch_info;
+	mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+	u32 idcode = 0;
+	
+	target->type->examined = 1;
+	
+	mips_ejtag_get_idcode(ejtag_info, &idcode, NULL);
+	
+	if (((idcode >> 1) & 0x7FF) == 0x29)
+	{
+		/* we are using a pic32mx so select ejtag port
+		 * as it is not selected by default */
+		mips_ejtag_set_instr(ejtag_info, 0x05, NULL);
+		LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
+	}
+	
+	/* init rest of ejtag interface */
+	if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
+		return retval;
+	
+	return ERROR_OK;
+}
+
+int mips_m4k_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
+{
+	return mips_m4k_write_memory(target, address, 4, count, buffer);
+}
diff --git a/src/target/mips_m4k.h b/src/target/mips_m4k.h
new file mode 100644
index 00000000..4f5d3bff
--- /dev/null
+++ b/src/target/mips_m4k.h
@@ -0,0 +1,52 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2008 by David T.L. Wong                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#ifndef MIPS_M4K_H
+#define MIPS_M4K_H
+
+#include "register.h"
+#include "target.h"
+
+#define MIPSM4K_COMMON_MAGIC	0xB321B321
+
+typedef struct mips_m4k_common_s
+{
+	int common_magic;
+	mips32_common_t mips32_common;
+	
+	char *variant;
+} mips_m4k_common_t;
+
+extern int mips_m4k_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer);
+
+extern void mips_m4k_enable_breakpoints(struct target_s *target);
+extern int mips_m4k_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint);
+extern int mips_m4k_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint);
+extern int mips_m4k_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint);
+extern int mips_m4k_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint);
+extern int mips_m4k_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint);
+extern int mips_m4k_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint);
+extern int mips_m4k_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint);
+extern int mips_m4k_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint);
+extern void mips_m4k_enable_watchpoints(struct target_s *target);
+
+#endif	/*MIPS_M4K_H*/
diff --git a/src/target/target.c b/src/target/target.c
index 3d0c4afd..58a940bd 100644
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -92,6 +92,7 @@ extern target_type_t feroceon_target;
 extern target_type_t xscale_target;
 extern target_type_t cortexm3_target;
 extern target_type_t arm11_target;
+extern target_type_t mips_m4k_target;
 
 target_type_t *target_types[] =
 {
@@ -105,6 +106,7 @@ target_type_t *target_types[] =
 	&xscale_target,
 	&cortexm3_target,
 	&arm11_target,
+	&mips_m4k_target,
 	NULL,
 };
 
diff --git a/src/target/target/pic32mx.cfg b/src/target/target/pic32mx.cfg
new file mode 100644
index 00000000..25ef0294
--- /dev/null
+++ b/src/target/target/pic32mx.cfg
@@ -0,0 +1,22 @@
+jtag_nsrst_delay 100
+jtag_ntrst_delay 100
+
+#use combined on interfaces or targets that can't set TRST/SRST separately
+reset_config srst_only
+
+#jtag scan chain
+#format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE)
+jtag_device 5 0x1 0x1 0x1e
+
+#target <type> <startup mode>
+#target arm7tdmi <reset mode> <chainpos> <endianness> <variant>
+target mips_m4k little 0
+run_and_halt_time 0 30
+
+working_area 0 0xa0000000 16384 nobackup
+
+#flash bank str7x <base> <size> 0 0 <target#> <variant>
+#flash bank stm32x 0 0 0 0 0
+
+# For more information about the configuration files, take a look at:
+# http://openfacts.berlios.de/index-en.phtml?title=Open+On-Chip+Debugger