riscv-openocd/src/target/mips32_pracc.c

/***************************************************************************
 *   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 <string.h>
#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_info->ejtag_ctrl;
		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)
{
	mips_ejtag_t *ejtag_info = ctx->ejtag_info;
	int offset;
	u32 ejtag_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!) */
	ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
	mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_CONTROL, NULL);
	mips_ejtag_drscan_32(ctx->ejtag_info, &ejtag_ctrl);
	
	return ERROR_OK;
}

static int mips32_pracc_exec_write(mips32_pracc_context *ctx, u32 address)
{
	u32 ejtag_ctrl,data;
	int offset;
	mips_ejtag_t *ejtag_info = ctx->ejtag_info;
	
	mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_DATA, NULL);
	mips_ejtag_drscan_32(ctx->ejtag_info, &data);
	
	/* Clear access pending bit */
	ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
	mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_CONTROL, NULL);
	mips_ejtag_drscan_32(ctx->ejtag_info, &ejtag_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 ejtag_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, &ejtag_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 (ejtag_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=ERROR_OK;
	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;
}