Exemplo n.º 1
0
int mips32_pracc_write_mem8(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint8_t *buf)
{
	static const uint32_t 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 $11,($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 */
															/* loop: */
		MIPS32_BEQ(0,10,8),									/* 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_B(NEG16(8)),									/* b loop */
		MIPS32_NOP,
															/* end: */
		MIPS32_LW(11,0,15),									/* lw $11,($15) */
		MIPS32_LW(10,0,15),									/* lw $10,($15) */
		MIPS32_LW(9,0,15),									/* lw $9,($15) */
		MIPS32_LW(8,0,15),									/* lw $8,($15) */
		MIPS32_B(NEG16(26)),								/* b start */
		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
	};

	/* TODO remove array */
	uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
	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, ARRAY_SIZE(code), code, \
		count + 2, param_in, 0, NULL, 1);

	free(param_in);

	return retval;
}
Exemplo n.º 2
0
int mips32_cp0_read(struct mips_ejtag *ejtag_info, uint32_t *val, uint32_t cp0_reg, uint32_t cp0_sel)
{
	/**
	 * Do not make this code static, but regenerate it every time,
	 * as 5th element has to be changed to add parameters
	 */
	uint32_t 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) */

		/* 5 */ MIPS32_MFC0(8, 0, 0),						/* move COP0 [cp0_reg select] to $8 */

		MIPS32_LUI(9, UPPER16(MIPS32_PRACC_PARAM_OUT)),		/* $11 = MIPS32_PRACC_PARAM_OUT */
		MIPS32_ORI(9, 9, LOWER16(MIPS32_PRACC_PARAM_OUT)),
		MIPS32_SW(8, 0, 9),									/* sw $8,0($9) */

		MIPS32_LW(9, 0, 15),								/* lw $9,($15) */
		MIPS32_LW(8, 0, 15),								/* lw $8,($15) */
		MIPS32_B(NEG16(12)),								/* b start */
		MIPS32_MFC0(15, 31, 0),								/* move COP0 DeSave to $15 */
	};

	/**
	 * Note that our input parametes cp0_reg and cp0_sel
	 * are numbers (not gprs) which make part of mfc0 instruction opcode.
	 *
	 * These are not fix, but can be different for each mips32_cp0_read() function call,
	 * and that is why we must insert them directly into opcode,
	 * i.e. we can not pass it on EJTAG microprogram stack (via param_in),
	 * and put them into the gprs later from MIPS32_PRACC_STACK
	 * because mfc0 do not use gpr as a parameter for the cp0_reg and select part,
	 * but plain (immediate) number.
	 *
	 * MIPS32_MTC0 is implemented via MIPS32_R_INST macro.
	 * In order to insert our parameters, we must change rd and funct fields.
	 */
	code[5] |= (cp0_reg << 11) | cp0_sel;  /* change rd and funct of MIPS32_R_INST macro */

	/* TODO remove array */
	uint32_t *param_out = val;
	int retval;

	retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 0, NULL, 1, param_out, 1);

	return retval;
}
Exemplo n.º 3
0
/**
 * \b mips32_pracc_sync_cache
 *
 * Synchronize Caches to Make Instruction Writes Effective
 * (ref. doc. MIPS32 Architecture For Programmers Volume II: The MIPS32 Instruction Set,
 *  Document Number: MD00086, Revision 2.00, June 9, 2003)
 *
 * When the instruction stream is written, the SYNCI instruction should be used
 * in conjunction with other instructions to make the newly-written instructions effective.
 *
 * Explanation :
 * A program that loads another program into memory is actually writing the D- side cache.
 * The instructions it has loaded can't be executed until they reach the I-cache.
 *
 * After the instructions have been written, the loader should arrange
 * to write back any containing D-cache line and invalidate any locations
 * already in the I-cache.
 *
 * You can do that with cache instructions, but those instructions are only available in kernel mode,
 * and a loader writing instructions for the use of its own process need not be privileged software.
 *
 * In the latest MIPS32/64 CPUs, MIPS provides the synci instruction,
 * which does the whole job for a cache-line-sized chunk of the memory you just loaded:
 * That is, it arranges a D-cache write-back and an I-cache invalidate.
 *
 * To employ synci at user level, you need to know the size of a cache line,
 * and that can be obtained with a rdhwr SYNCI_Step
 * from one of the standard “hardware registers”.
 */
static int mips32_pracc_sync_cache(struct mips_ejtag *ejtag_info,
		uint32_t start_addr, uint32_t end_addr)
{
	static const uint32_t 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 $11,($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 start_addr to $9 */
		MIPS32_LW(10, 4, 8),								/* Load write end_addr to $10 */

		MIPS32_RDHWR(11, MIPS32_SYNCI_STEP),				/* $11 = MIPS32_SYNCI_STEP */
		MIPS32_BEQ(11, 0, 6),								/* beq $11, $0, end */
		MIPS32_NOP,
															/* synci_loop : */
		MIPS32_SYNCI(0, 9),									/* synci 0($9) */
		MIPS32_SLTU(8, 10, 9),								/* sltu $8, $10, $9  # $8 = $10 < $9 ? 1 : 0 */
		MIPS32_BNE(8, 0, NEG16(3)),							/* bne $8, $0, synci_loop */
		MIPS32_ADDU(9, 9, 11),								/* $9 += MIPS32_SYNCI_STEP */
		MIPS32_SYNC,
															/* end: */
		MIPS32_LW(11, 0, 15),								/* lw $11,($15) */
		MIPS32_LW(10, 0, 15),								/* lw $10,($15) */
		MIPS32_LW(9, 0, 15),								/* lw $9,($15) */
		MIPS32_LW(8, 0, 15),								/* lw $8,($15) */
		MIPS32_B(NEG16(24)),								/* b start */
		MIPS32_MFC0(15, 31, 0),								/* move COP0 DeSave to $15 */
	};

	/* TODO remove array */
	uint32_t *param_in = malloc(2 * sizeof(uint32_t));
	int retval;
	param_in[0] = start_addr;
	param_in[1] = end_addr;

	retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 2, param_in, 0, NULL, 1);

	free(param_in);

	return retval;
}
Exemplo n.º 4
0
static int mips32_pracc_read_u32(struct mips_ejtag *ejtag_info, uint32_t addr, uint32_t *buf)
{
	static const uint32_t 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_LW(8, NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN), 15), /* load R8 @ param_in[0] = address */

		MIPS32_LW(8, 0, 8),									/* lw $8,0($8), Load $8 with the word @mem[$8] */
		MIPS32_SW(8, NEG16(MIPS32_PRACC_STACK - MIPS32_PRACC_PARAM_OUT), 15), /* store R8 @ param_out[0] */

		MIPS32_LW(8, 0, 15),								/* lw $8,($15) */
		MIPS32_B(NEG16(9)),									/* b start */
		MIPS32_MFC0(15, 31, 0),								/* move COP0 DeSave to $15 */
	};

	int retval = ERROR_OK;
	uint32_t param_in[1];

	param_in[0] = addr;

	retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
			ARRAY_SIZE(param_in), param_in, 1, buf, 1);
	if (retval != ERROR_OK)
		return retval;

	return retval;
}
Exemplo n.º 5
0
int mips32_pracc_write_u32(struct mips_ejtag *ejtag_info, uint32_t addr, uint32_t *buf)
{
	static const uint32_t 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_LW(8,NEG16((MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN)-4), 15),	/* load R8 @ param_in[1] = data */
		MIPS32_LW(9,NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN), 15),		/* load R9 @ param_in[0] = address */

		MIPS32_SW(8,0,9),									/* sw $8,0($9) */

		MIPS32_LW(9,0,15),									/* lw $9,($15) */
		MIPS32_LW(8,0,15),									/* lw $8,($15) */
		MIPS32_B(NEG16(11)),								/* b start */
		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
	};

	/* TODO remove array */
	uint32_t param_in[1 + 1];
	param_in[0] = addr;
	param_in[1] = *buf;

	mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, \
		ARRAY_SIZE(param_in), param_in, 0, NULL, 1);

	return ERROR_OK;
}
Exemplo n.º 6
0
int mips32_cp0_write(struct mips_ejtag *ejtag_info,
		uint32_t val, uint32_t cp0_reg, uint32_t cp0_sel)
{
	uint32_t 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_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 val to $9 */

		/* 8 */ MIPS32_MTC0(9, 0, 0),						/* move $9 to COP0 [cp0_reg select] */

		MIPS32_LW(9, 0, 15),								/* lw $9,($15) */
		MIPS32_LW(8, 0, 15),								/* lw $8,($15) */
		MIPS32_B(NEG16(12)),								/* b start */
		MIPS32_MFC0(15, 31, 0),								/* move COP0 DeSave to $15 */
	};

	/**
	 * Note that MIPS32_MTC0 macro is implemented via MIPS32_R_INST macro.
	 * In order to insert our parameters, we must change rd and funct fields.
	 */
	code[8] |= (cp0_reg << 11) | cp0_sel;  /* change rd and funct fields of MIPS32_R_INST macro */

	/* TODO remove array */
	uint32_t *param_in = malloc(1 * sizeof(uint32_t));
	int retval;
	param_in[0] = val;

	retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 1, param_in, 0, NULL, 1);

	free(param_in);

	return retval;
}
Exemplo n.º 7
0
static int mips32_pracc_write_mem32(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint32_t *buf)
{
	static const uint32_t 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 $11,($15) */

		MIPS32_ADDI(8,15,NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN)),  /* $8= 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 beginning of data */

															/* loop: */
		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(9,9,4),									/* $9 += 4 */
		MIPS32_BNE(10,9,NEG16(4)),							/* bne $10, $9, loop */
		MIPS32_ADDI(8,8,4),									/* $8 += 4 */

															/* end: */
		MIPS32_LW(11,0,15),									/* lw $11,($15) */
		MIPS32_LW(10,0,15),									/* lw $10,($15) */
		MIPS32_LW(9,0,15),									/* lw $9,($15) */
		MIPS32_LW(8,0,15),									/* lw $8,($15) */
		MIPS32_B(NEG16(21)),								/* b start */
		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
	};

	/* TODO remove array */
	uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
	param_in[0] = addr;
	param_in[1] = addr + (count * sizeof(uint32_t));	/* last address */

	memcpy(&param_in[2], buf, count * sizeof(uint32_t));

	int retval;
	retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
		count + 2, param_in, 0, NULL, 1);

	free(param_in);

	return retval;
}
Exemplo n.º 8
0
/* Set (to enable) or clear (to disable stepping) the SSt bit (bit 8) in Cp0 Debug reg (reg 23, sel 0) */
int mips_ejtag_config_step(struct mips_ejtag *ejtag_info, int enable_step)
{
	struct pracc_queue_info ctx = {.max_code = 7};
	pracc_queue_init(&ctx);
	if (ctx.retval != ERROR_OK)
		goto exit;

	pracc_add(&ctx, 0, MIPS32_MFC0(8, 23, 0));			/* move COP0 Debug to $8 */
	pracc_add(&ctx, 0, MIPS32_ORI(8, 8, 0x0100));			/* set SSt bit in debug reg */
	if (!enable_step)
		pracc_add(&ctx, 0, MIPS32_XORI(8, 8, 0x0100));		/* clear SSt bit in debug reg */

	pracc_add(&ctx, 0, MIPS32_MTC0(8, 23, 0));			/* move $8 to COP0 Debug */
	pracc_add(&ctx, 0, MIPS32_LUI(8, UPPER16(ejtag_info->reg8)));		/* restore upper 16 bits  of $8 */
	pracc_add(&ctx, 0, MIPS32_B(NEG16((ctx.code_count + 1))));			/* jump to start */
	pracc_add(&ctx, 0, MIPS32_ORI(8, 8, LOWER16(ejtag_info->reg8)));	/* restore lower 16 bits of $8 */

	ctx.retval = mips32_pracc_queue_exec(ejtag_info, &ctx, NULL);
exit:
	pracc_queue_free(&ctx);
	return ctx.retval;
}

/*
 * Disable memory protection for 0xFF20.0000–0xFF3F.FFFF
 * It is needed by EJTAG 1.5-2.0, especially for BMIPS CPUs
 * For example bcm7401 and others. At leas on some
 * CPUs, DebugMode wont start if this bit is not removed.
 */
static int disable_dcr_mp(struct mips_ejtag *ejtag_info)
{
	uint32_t dcr;
	int retval;

	retval = mips32_dmaacc_read_mem(ejtag_info, EJTAG_DCR, 4, 1, &dcr);
	if (retval != ERROR_OK)
		goto error;

	dcr &= ~EJTAG_DCR_MP;
	retval = mips32_dmaacc_write_mem(ejtag_info, EJTAG_DCR, 4, 1, &dcr);
	if (retval != ERROR_OK)
		goto error;
	return ERROR_OK;
error:
	LOG_ERROR("Failed to remove DCR MPbit!");
	return retval;
}
Exemplo n.º 9
0
static int ath79_spi_bitbang_codegen(struct ath79_flash_bank *ath79_info,
				     struct pracc_queue_info *ctx,
				     uint8_t *data, int len,
				     int partial_xfer)
{
	uint32_t cs_high = ATH79_SPI_CS_ALLHI;
	uint32_t cs_low = ath79_chipselects[ath79_info->chipselect];
	uint32_t clock_high = cs_low | ATH79_SPI_CE_HI;
	uint32_t clock_low = cs_low;
	uint32_t pracc_out = 0;
	uint32_t io_base = ath79_info->io_base;

	const uint32_t preamble1[] = {
		/* $15 = MIPS32_PRACC_BASE_ADDR */
		MIPS32_LUI(0, 15, PRACC_UPPER_BASE_ADDR),
		/* $1 = io_base */
		MIPS32_LUI(0, 1, UPPER16(io_base)),
	};
	ath79_pracc_addn(ctx, preamble1, ARRAY_SIZE(preamble1));
	if (ath79_info->spi.pre_deselect) {
		/* Clear deselect flag so we don't deselect again if
		 * this is a partial xfer.
		 */
		ath79_info->spi.pre_deselect = 0;
		const uint32_t pre_deselect[] = {
			/* [$1 + FS] = 1  (enable flash io register access) */
			MIPS32_LUI(0, 2, UPPER16(1)),
			MIPS32_ORI(0, 2, 2, LOWER16(1)),
			MIPS32_SW(0, 2, ATH79_REG_FS, 1),
			/* deselect flash just in case */
			/* $2 = SPI_CS_DIS */
			MIPS32_LUI(0, 2, UPPER16(cs_high)),
			MIPS32_ORI(0, 2, 2, LOWER16(cs_high)),
			/* [$1 + WRITE] = $2 */
			MIPS32_SW(0, 2, ATH79_REG_WRITE, 1),
		};
		ath79_pracc_addn(ctx, pre_deselect, ARRAY_SIZE(pre_deselect));
	}
	const uint32_t preamble2[] = {
		/* t0 = CLOCK_LOW + 0-bit */
		MIPS32_LUI(0, 8, UPPER16((clock_low + 0))),
		MIPS32_ORI(0, 8, 8, LOWER16((clock_low + 0))),
		/* t1 = CLOCK_LOW + 1-bit */
		MIPS32_LUI(0, 9, UPPER16((clock_low + 1))),
		MIPS32_ORI(0, 9, 9, LOWER16((clock_low + 1))),
		/* t2 = CLOCK_HIGH + 0-bit */
		MIPS32_LUI(0, 10, UPPER16((clock_high + 0))),
		MIPS32_ORI(0, 10, 10, LOWER16((clock_high + 0))),
		/* t3 = CLOCK_HIGH + 1-bit */
		MIPS32_LUI(0, 11, UPPER16((clock_high + 1))),
		MIPS32_ORI(0, 11, 11, LOWER16((clock_high + 1))),
	};
	ath79_pracc_addn(ctx, preamble2, ARRAY_SIZE(preamble2));

	for (int i = 0; i < len; i++) {
		uint8_t x = data[i];

		/* Generate bitbang code for one byte, highest bit first .*/
		for (int j = BITS_PER_BYTE - 1; j >= 0; j--) {
			int bit = ((x >> j) & 1);

			if (bit) {
				/* [$1 + WRITE] = t1 */
				pracc_add(ctx, 0,
					  MIPS32_SW(0, 9, ATH79_REG_WRITE, 1));
				/* [$1 + WRITE] = t3 */
				pracc_add(ctx, 0,
					  MIPS32_SW(0, 11, ATH79_REG_WRITE, 1));
			} else {
				/* [$1 + WRITE] = t0 */
				pracc_add(ctx, 0,
					  MIPS32_SW(0, 8, ATH79_REG_WRITE, 1));
				/* [$1 + WRITE] = t2 */
				pracc_add(ctx, 0,
					  MIPS32_SW(0, 10, ATH79_REG_WRITE, 1));
			}
		}
		if (i % 4 == 3) {
			/* $3 = [$1 + DATA] */
			pracc_add(ctx, 0, MIPS32_LW(0, 3, ATH79_REG_DATA, 1));
			/* [OUTi] = $3 */
			pracc_add(ctx, MIPS32_PRACC_PARAM_OUT + pracc_out,
				  MIPS32_SW(0, 3, PRACC_OUT_OFFSET +
				 pracc_out, 15));
			pracc_out += 4;
		}
	}
	if (len & 3) { /* not a multiple of 4 bytes */
		/* $3 = [$1 + DATA] */
		pracc_add(ctx, 0, MIPS32_LW(0, 3, ATH79_REG_DATA, 1));
		/* [OUTi] = $3 */
		pracc_add(ctx, MIPS32_PRACC_PARAM_OUT + pracc_out,
			  MIPS32_SW(0, 3, PRACC_OUT_OFFSET + pracc_out, 15));
		pracc_out += 4;
	}

	if (ath79_info->spi.post_deselect && !partial_xfer) {
		const uint32_t post_deselect[] = {
			/* $2 = SPI_CS_DIS */
			MIPS32_LUI(0, 2, UPPER16(cs_high)),
			MIPS32_ORI(0, 2, 2, LOWER16(cs_high)),
			/* [$1 + WRITE] = $2 */
			MIPS32_SW(0, 2, ATH79_REG_WRITE, 1),

			/* [$1 + FS] = 0  (disable flash io register access) */
			MIPS32_XORI(0, 2, 2, 0),
			MIPS32_SW(0, 2, ATH79_REG_FS, 1),
		};
		ath79_pracc_addn(ctx, post_deselect, ARRAY_SIZE(post_deselect));
	}

	/* common pracc epilogue */
	/* jump to start */
	pracc_add(ctx, 0, MIPS32_B(0, NEG16(ctx->code_count + 1)));
	/* restore $15 from DeSave */
	pracc_add(ctx, 0, MIPS32_MFC0(0, 15, 31, 0));

	return pracc_out / 4;
}
Exemplo n.º 10
0
/**
 * \b mips32_pracc_clean_invalidate_cache
 *
 * Writeback D$ and Invalidate I$
 * so that the instructions written can be visible to CPU
 */
static int mips32_pracc_clean_invalidate_cache(struct mips_ejtag *ejtag_info,
													uint32_t start_addr, uint32_t end_addr)
{
	static const uint32_t 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 $11,($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 start_addr to $9 */
		MIPS32_LW(10, 4, 8),								/* Load write end_addr to $10 */
		MIPS32_LW(11, 8, 8),								/* Load write clsiz to $11 */

															/* cache_loop: */
		MIPS32_SLTU(8, 10, 9),								/* sltu $8, $10, $9  :  $8 <- $10 < $9 ? */
		MIPS32_BGTZ(8, 6),									/* bgtz $8, end */
		MIPS32_NOP,

		MIPS32_CACHE(MIPS32_CACHE_D_HIT_WRITEBACK, 0, 9),		/* cache Hit_Writeback_D, 0($9) */
		MIPS32_CACHE(MIPS32_CACHE_I_HIT_INVALIDATE, 0, 9),	/* cache Hit_Invalidate_I, 0($9) */

		MIPS32_ADDU(9, 9, 11),								/* $9 += $11 */

		MIPS32_B(NEG16(7)),									/* b cache_loop */
		MIPS32_NOP,
															/* end: */
		MIPS32_LW(11, 0, 15),								/* lw $11,($15) */
		MIPS32_LW(10, 0, 15),								/* lw $10,($15) */
		MIPS32_LW(9, 0, 15),								/* lw $9,($15) */
		MIPS32_LW(8, 0, 15),								/* lw $8,($15) */
		MIPS32_B(NEG16(25)),								/* b start */
		MIPS32_MFC0(15, 31, 0),								/* move COP0 DeSave to $15 */
	};

	/**
	 * Find cache line size in bytes
	 */
	uint32_t conf;
	uint32_t dl, clsiz;

	mips32_cp0_read(ejtag_info, &conf, 16, 1);
	dl = (conf & MIPS32_CONFIG1_DL_MASK) >> MIPS32_CONFIG1_DL_SHIFT;

	/* dl encoding : dl=1 => 4 bytes, dl=2 => 8 bytes, etc... */
	clsiz = 0x2 << dl;

	/* TODO remove array */
	uint32_t *param_in = malloc(3 * sizeof(uint32_t));
	int retval;
	param_in[0] = start_addr;
	param_in[1] = end_addr;
	param_in[2] = clsiz;

	retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 3, param_in, 0, NULL, 1);

	free(param_in);

	return retval;
}
Exemplo n.º 11
0
static int mips32_pracc_read_mem8(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint8_t *buf)
{
	static const uint32_t 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 $11,($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)),
															/* loop: */
		MIPS32_BEQ(0, 10, 8),								/* beq 0, $10, end */
		MIPS32_NOP,

		MIPS32_LBU(8, 0, 9),								/* lw $8,0($9), Load t4 with the byte @mem[t1] */
		MIPS32_SW(8, 0, 11),								/* sw $8,0($11) */

		MIPS32_ADDI(10, 10, NEG16(1)),						/* $10-- */
		MIPS32_ADDI(9, 9, 1),								/* $9 += 1 */
		MIPS32_ADDI(11, 11, 4),								/* $11 += 4 */
		MIPS32_B(NEG16(8)),									/* b loop */
		MIPS32_NOP,
															/* end: */
		MIPS32_LW(11, 0, 15),								/* lw $11,($15) */
		MIPS32_LW(10, 0, 15),								/* lw $10,($15) */
		MIPS32_LW(9, 0, 15),								/* lw $9,($15) */
		MIPS32_LW(8, 0, 15),								/* lw $8,($15) */
		MIPS32_B(NEG16(27)),								/* b start */
		MIPS32_MFC0(15, 31, 0),								/* move COP0 DeSave to $15 */
	};

	/* TODO remove array */
	uint32_t *param_out = malloc(count * sizeof(uint32_t));
	if (param_out == NULL) {
		LOG_ERROR("Out of memory");
		return ERROR_FAIL;
	}

	int retval = ERROR_OK;
	int blocksize;
	uint32_t param_in[2];
	int bytesread = 0;

	while (count > 0) {
		blocksize = count;
		if (count > 0x400)
			blocksize = 0x400;

		param_in[0] = addr;
		param_in[1] = blocksize;

		retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
			ARRAY_SIZE(param_in), param_in, count, &param_out[bytesread], 1);

		if (retval != ERROR_OK)
			return retval;

		count -= blocksize;
		addr += blocksize;
		bytesread += blocksize;
	}
	int i;
	for (i = 0; i < bytesread; i++)
		buf[i] = param_out[i];

	free(param_out);
	return retval;
}
Exemplo n.º 12
0
static int mips32_pracc_read_mem32(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint32_t *buf)
{
	static const uint32_t 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 $11,($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)),
															/* loop: */
		MIPS32_BEQ(0, 10, 8),								/* beq 0, $10, end */
		MIPS32_NOP,

		MIPS32_LW(8, 0, 9),									/* lw $8,0($9), Load $8 with the word @mem[$9] */
		MIPS32_SW(8, 0, 11),								/* sw $8,0($11) */

		MIPS32_ADDI(10, 10, NEG16(1)),						/* $10-- */
		MIPS32_ADDI(9, 9, 4),								/* $1 += 4 */
		MIPS32_ADDI(11, 11, 4),								/* $11 += 4 */

		MIPS32_B(NEG16(8)),									/* b loop */
		MIPS32_NOP,
															/* end: */
		MIPS32_LW(11, 0, 15),								/* lw $11,($15) */
		MIPS32_LW(10, 0, 15),								/* lw $10,($15) */
		MIPS32_LW(9, 0, 15),								/* lw $9,($15) */
		MIPS32_LW(8, 0, 15),								/* lw $8,($15) */
		MIPS32_B(NEG16(27)),								/* b start */
		MIPS32_MFC0(15, 31, 0),								/* move COP0 DeSave to $15 */
	};

	int retval = ERROR_OK;
	int blocksize;
	int wordsread;
	uint32_t param_in[2];

	wordsread = 0;

	while (count > 0) {
		blocksize = count;
		if (count > 0x400)
			blocksize = 0x400;

		param_in[0] = addr;
		param_in[1] = blocksize;

		retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
				ARRAY_SIZE(param_in), param_in, blocksize, &buf[wordsread], 1);
		if (retval != ERROR_OK)
			return retval;

		count -= blocksize;
		addr += blocksize*sizeof(uint32_t);
		wordsread += blocksize;
	}

	return retval;
}
Exemplo n.º 13
0
/* fastdata upload/download requires an initialized working area
 * to load the download code; it should not be called otherwise
 * fetch order from the fastdata area
 * 1. start addr
 * 2. end addr
 * 3. data ...
 */
int mips32_pracc_fastdata_xfer(struct mips_ejtag *ejtag_info, struct working_area *source,
								int write, uint32_t addr, int count, uint32_t *buf)
{
	uint32_t handler_code[] = {
		/* caution when editing, table is modified below */
		/* r15 points to the start of this code */
		MIPS32_SW(8,MIPS32_FASTDATA_HANDLER_SIZE - 4,15),
		MIPS32_SW(9,MIPS32_FASTDATA_HANDLER_SIZE - 8,15),
		MIPS32_SW(10,MIPS32_FASTDATA_HANDLER_SIZE - 12,15),
		MIPS32_SW(11,MIPS32_FASTDATA_HANDLER_SIZE - 16,15),
		/* start of fastdata area in t0 */
		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_FASTDATA_AREA)),
		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_FASTDATA_AREA)),
		MIPS32_LW(9,0,8),								/* start addr in t1 */
		MIPS32_LW(10,0,8),								/* end addr to t2 */
														/* loop: */
		/* 8 */ MIPS32_LW(11,0,0),						/* lw t3,[t8 | r9] */
		/* 9 */ MIPS32_SW(11,0,0),						/* sw t3,[r9 | r8] */
		MIPS32_BNE(10,9,NEG16(3)),						/* bne $t2,t1,loop */
		MIPS32_ADDI(9,9,4),								/* addi t1,t1,4 */

		MIPS32_LW(8,MIPS32_FASTDATA_HANDLER_SIZE - 4,15),
		MIPS32_LW(9,MIPS32_FASTDATA_HANDLER_SIZE - 8,15),
		MIPS32_LW(10,MIPS32_FASTDATA_HANDLER_SIZE - 12,15),
		MIPS32_LW(11,MIPS32_FASTDATA_HANDLER_SIZE - 16,15),

		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_TEXT)),
		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_TEXT)),
		MIPS32_JR(15),									/* jr start */
		MIPS32_MFC0(15,31,0),							/* move COP0 DeSave to $15 */
	};

	uint32_t jmp_code[] = {
		MIPS32_MTC0(15,31,0),			/* move $15 to COP0 DeSave */
		/* 1 */ MIPS32_LUI(15,0),		/* addr of working area added below */
		/* 2 */ MIPS32_ORI(15,15,0),	/* addr of working area added below */
		MIPS32_JR(15),					/* jump to ram program */
		MIPS32_NOP,
	};

	int retval, i;
	uint32_t val, ejtag_ctrl, address;

	if (source->size < MIPS32_FASTDATA_HANDLER_SIZE)
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;

	if (write)
	{
		handler_code[8] = MIPS32_LW(11,0,8);	/* load data from probe at fastdata area */
		handler_code[9] = MIPS32_SW(11,0,9);	/* store data to RAM @ r9 */
	}
	else
	{
		handler_code[8] = MIPS32_LW(11,0,9);	/* load data from RAM @ r9 */
		handler_code[9] = MIPS32_SW(11,0,8);	/* store data to probe at fastdata area */
	}

	/* write program into RAM */
	mips32_pracc_write_mem32(ejtag_info, source->address, ARRAY_SIZE(handler_code), handler_code);

	LOG_DEBUG("%s using 0x%.8" PRIx32 " for write handler\n", __func__, source->address);

	jmp_code[1] |= UPPER16(source->address);
	jmp_code[2] |= LOWER16(source->address);

	for (i = 0; i < (int) ARRAY_SIZE(jmp_code); i++)
	{
		if ((retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl)) != ERROR_OK)
			return retval;

		mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
		mips_ejtag_drscan_32(ejtag_info, &jmp_code[i]);

		/* Clear the access pending bit (let the processor eat!) */
		ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
		mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
		mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
	}

	if ((retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl)) != ERROR_OK)
		return retval;

	/* next fetch to dmseg should be in FASTDATA_AREA, check */
	address = 0;
	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
	mips_ejtag_drscan_32(ejtag_info, &address);

	if (address != MIPS32_PRACC_FASTDATA_AREA)
		return ERROR_FAIL;

	/* Send the load start address */
	val = addr;
	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_FASTDATA, NULL);
	mips_ejtag_fastdata_scan(ejtag_info, 1, &val);

	/* Send the load end address */
	val = addr + (count - 1) * 4;
	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_FASTDATA, NULL);
	mips_ejtag_fastdata_scan(ejtag_info, 1, &val);

	for (i = 0; i < count; i++)
	{
		/* Send the data out using fastdata (clears the access pending bit) */
		if ((retval = mips_ejtag_fastdata_scan(ejtag_info, write, buf++)) != ERROR_OK)
			return retval;
	}

	if ((retval = jtag_execute_queue()) != ERROR_OK)
	{
		LOG_ERROR("fastdata load failed");
		return retval;
	}

	if ((retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl)) != ERROR_OK)
		return retval;

	address = 0;
	mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
	mips_ejtag_drscan_32(ejtag_info, &address);

	if (address != MIPS32_PRACC_TEXT)
		LOG_ERROR("mini program did not return to start\n");

	return retval;
}
Exemplo n.º 14
0
int mips32_pracc_read_regs(struct mips_ejtag *ejtag_info, uint32_t *regs)
{
	static const uint32_t 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_MFLO(2),									/* move lo to $2 */
		MIPS32_SW(2,33*4,1),							/* sw $2,33*4($1) */
		MIPS32_MFHI(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 depc (pc) to $2 */
		MIPS32_SW(2,37*4,1),							/* sw $2,37*4($1) */

		MIPS32_LW(2,0,15),								/* lw $2,($15) */
		MIPS32_LW(1,0,15),								/* lw $1,($15) */
		MIPS32_B(NEG16(58)),							/* b start */
		MIPS32_MFC0(15,31,0),							/* move COP0 DeSave to $15 */
	};

	int retval;

	retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, \
		0, NULL, MIPS32NUMCOREREGS, regs, 1);

	return retval;
}
Exemplo n.º 15
0
int mips32_pracc_read_mem16(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint16_t *buf)
{
	static const uint32_t 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 $11,($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)),
															/* loop: */
		MIPS32_BEQ(0,10,8),									/* beq 0, $10, end */
		MIPS32_NOP,

		MIPS32_LHU(8,0,9),									/* lw $8,0($9), Load $8 with the halfword @mem[$9] */
		MIPS32_SW(8,0,11),									/* sw $8,0($11) */

		MIPS32_ADDI(10,10,NEG16(1)),						/* $10-- */
		MIPS32_ADDI(9,9,2),									/* $9 += 2 */
		MIPS32_ADDI(11,11,4),								/* $11 += 4 */
		MIPS32_B(NEG16(8)),									/* b loop */
		MIPS32_NOP,
															/* end: */
		MIPS32_LW(11,0,15),									/* lw $11,($15) */
		MIPS32_LW(10,0,15),									/* lw $10,($15) */
		MIPS32_LW(9,0,15),									/* lw $9,($15) */
		MIPS32_LW(8,0,15),									/* lw $8,($15) */
		MIPS32_B(NEG16(27)),								/* b start */
		MIPS32_MFC0(15,30,0),								/* move COP0 DeSave to $15 */
	};

	/* TODO remove array */
	uint32_t *param_out = malloc(count * sizeof(uint32_t));
	int i;

//	int retval;
	int blocksize;
	int bytesread;
	uint32_t 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, ARRAY_SIZE(code), code, \
			ARRAY_SIZE(param_in), param_in, count, param_out, 1);

//		count -= blocksize;
//		addr += blocksize;
//		bytesread += blocksize;
	}

	for (i = 0; i < count; i++)
	{
		buf[i] = param_out[i];
	}

	free(param_out);

	return ERROR_OK;
}