arm7_9_common.c 73.8 KB
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/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   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.             *
 ***************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif

#include "replacements.h"
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#include "embeddedice.h"
#include "target.h"
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#include "target_request.h"
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#include "armv4_5.h"
#include "arm_jtag.h"
#include "jtag.h"
#include "log.h"
#include "arm7_9_common.h"
#include "breakpoints.h"

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>

int arm7_9_debug_entry(target_t *target);
int arm7_9_enable_sw_bkpts(struct target_s *target);

/* command handler forward declarations */
int handle_arm7_9_write_xpsr_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int handle_arm7_9_write_xpsr_im8_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int handle_arm7_9_read_core_reg_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int handle_arm7_9_write_core_reg_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int handle_arm7_9_sw_bkpts_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int handle_arm7_9_force_hw_bkpts_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int handle_arm7_9_dbgrq_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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int handle_arm7_9_fast_memory_access_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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int handle_arm7_9_dcc_downloads_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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int handle_arm7_9_etm_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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int arm7_9_reinit_embeddedice(target_t *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	breakpoint_t *breakpoint = target->breakpoints;
	
	arm7_9->wp_available = 2;
	arm7_9->wp0_used = 0;
	arm7_9->wp1_used = 0;
		
	/* mark all hardware breakpoints as unset */
	while (breakpoint)
	{
		if (breakpoint->type == BKPT_HARD)
		{
			breakpoint->set = 0;
		}
		breakpoint = breakpoint->next;
	}
		
	if (arm7_9->sw_bkpts_enabled && arm7_9->sw_bkpts_use_wp)
	{
		arm7_9->sw_bkpts_enabled = 0;
		arm7_9_enable_sw_bkpts(target);
	}
	
	arm7_9->reinit_embeddedice = 0;
	
	return ERROR_OK;
}

int arm7_9_jtag_callback(enum jtag_event event, void *priv)
{
	target_t *target = priv;
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	/* a test-logic reset occured
	 * the EmbeddedICE registers have been reset
	 * hardware breakpoints have been cleared
	 */
	if (event == JTAG_TRST_ASSERTED)
	{
		arm7_9->reinit_embeddedice = 1;
	}
	
	return ERROR_OK;
}

int arm7_9_get_arch_pointers(target_t *target, armv4_5_common_t **armv4_5_p, arm7_9_common_t **arm7_9_p)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
	{
		return -1;
	}
	
	if (arm7_9->common_magic != ARM7_9_COMMON_MAGIC)
	{
		return -1;
	}
	
	*armv4_5_p = armv4_5;
	*arm7_9_p = arm7_9;
	
	return ERROR_OK;
}

int arm7_9_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (arm7_9->force_hw_bkpts)
		breakpoint->type = BKPT_HARD;

	if (breakpoint->set)
	{
		WARNING("breakpoint already set");
		return ERROR_OK;
	}

	if (breakpoint->type == BKPT_HARD)
	{
		/* either an ARM (4 byte) or Thumb (2 byte) breakpoint */
		u32 mask = (breakpoint->length == 4) ? 0x3u : 0x1u;
		if (!arm7_9->wp0_used)
		{
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], breakpoint->address);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], mask);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffffu);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], ~EICE_W_CTRL_nOPC & 0xff);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], EICE_W_CTRL_ENABLE);

			jtag_execute_queue();
			arm7_9->wp0_used = 1;
			breakpoint->set = 1;
		}
		else if (!arm7_9->wp1_used)
		{
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_VALUE], breakpoint->address);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_MASK], mask);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_MASK], 0xffffffffu);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_MASK], ~EICE_W_CTRL_nOPC & 0xff);
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], EICE_W_CTRL_ENABLE);

			jtag_execute_queue();
			arm7_9->wp1_used = 1;
			breakpoint->set = 2;
		}
		else
		{
			ERROR("BUG: no hardware comparator available");
			return ERROR_OK;
		}
	}
	else if (breakpoint->type == BKPT_SOFT)
	{
		if (breakpoint->length == 4)
		{
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			/* keep the original instruction in target endianness */
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			target->type->read_memory(target, breakpoint->address, 4, 1, breakpoint->orig_instr);
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			/* write the breakpoint instruction in target endianness (arm7_9->arm_bkpt is host endian) */
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			target_write_u32(target, breakpoint->address, arm7_9->arm_bkpt);
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		}
		else
		{
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			/* keep the original instruction in target endianness */
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			target->type->read_memory(target, breakpoint->address, 2, 1, breakpoint->orig_instr);
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			/* write the breakpoint instruction in target endianness (arm7_9->thumb_bkpt is host endian) */
			target_write_u16(target, breakpoint->address, arm7_9->thumb_bkpt);
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		}
		breakpoint->set = 1;
	}

	return ERROR_OK;

}

int arm7_9_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	if (!breakpoint->set)
	{
		WARNING("breakpoint not set");
		return ERROR_OK;
	}
	
	if (breakpoint->type == BKPT_HARD)
	{
		if (breakpoint->set == 1)
		{
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x0);
			jtag_execute_queue();
			arm7_9->wp0_used = 0;
		}
		else if (breakpoint->set == 2)
		{
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], 0x0);
			jtag_execute_queue();
			arm7_9->wp1_used = 0;
		}
		breakpoint->set = 0;
	}
	else
	{
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		/* restore original instruction (kept in target endianness) */
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		if (breakpoint->length == 4)
		{
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			u32 current_instr;
			/* check that user program as not modified breakpoint instruction */
			target->type->read_memory(target, breakpoint->address, 4, 1, (u8*)&current_instr);
			if (current_instr==arm7_9->arm_bkpt)
				target->type->write_memory(target, breakpoint->address, 4, 1, breakpoint->orig_instr);
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		}
		else
		{
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			u16 current_instr;
			/* check that user program as not modified breakpoint instruction */
			target->type->read_memory(target, breakpoint->address, 2, 1, (u8*)&current_instr);
			if (current_instr==arm7_9->thumb_bkpt)
				target->type->write_memory(target, breakpoint->address, 2, 1, breakpoint->orig_instr);
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		}
		breakpoint->set = 0;
	}

	return ERROR_OK;
}

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int arm7_9_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
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{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (arm7_9->force_hw_bkpts)
	{
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		DEBUG("forcing use of hardware breakpoint at address 0x%8.8x", breakpoint->address);
		breakpoint->type = BKPT_HARD;
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	}
	
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	if ((breakpoint->type == BKPT_SOFT) && (arm7_9->sw_bkpts_enabled == 0))
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	{
		INFO("sw breakpoint requested, but software breakpoints not enabled");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}
	
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	if ((breakpoint->type == BKPT_HARD) && (arm7_9->wp_available < 1))
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	{
		INFO("no watchpoint unit available for hardware breakpoint");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}
	
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	if ((breakpoint->length != 2) && (breakpoint->length != 4))
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	{
		INFO("only breakpoints of two (Thumb) or four (ARM) bytes length supported");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}
	
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	if (breakpoint->type == BKPT_HARD)
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		arm7_9->wp_available--;
	
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	return ERROR_OK;
}

int arm7_9_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (breakpoint->set)
	{
		arm7_9_unset_breakpoint(target, breakpoint);
	}
	
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	if (breakpoint->type == BKPT_HARD)
		arm7_9->wp_available++;
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	return ERROR_OK;
}

int arm7_9_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	int rw_mask = 1;
	u32 mask;
	
	mask = watchpoint->length - 1;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (watchpoint->rw == WPT_ACCESS)
		rw_mask = 0;
	else
		rw_mask = 1;
	
	if (!arm7_9->wp0_used)
	{
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], watchpoint->address);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], mask);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], watchpoint->mask);
		if( watchpoint->mask != 0xffffffffu )
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_VALUE], watchpoint->value);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xff & ~EICE_W_CTRL_nOPC & ~rw_mask);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], EICE_W_CTRL_ENABLE | EICE_W_CTRL_nOPC | (watchpoint->rw & 1));

		jtag_execute_queue();
		watchpoint->set = 1;
		arm7_9->wp0_used = 2;
	}
	else if (!arm7_9->wp1_used)
	{
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_VALUE], watchpoint->address);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_MASK], mask);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_MASK], watchpoint->mask);
		if( watchpoint->mask != 0xffffffffu )
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_VALUE], watchpoint->value);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_MASK], 0xff & ~EICE_W_CTRL_nOPC & ~rw_mask);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], EICE_W_CTRL_ENABLE | EICE_W_CTRL_nOPC | (watchpoint->rw & 1));

		jtag_execute_queue();
		watchpoint->set = 2;
		arm7_9->wp1_used = 2;
	} 
	else
	{
		ERROR("BUG: no hardware comparator available");
		return ERROR_OK;
	}
	
	return ERROR_OK;
}

int arm7_9_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (!watchpoint->set)
	{
		WARNING("breakpoint not set");
		return ERROR_OK;
	}
	
	if (watchpoint->set == 1)
	{
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x0);
		jtag_execute_queue();
		arm7_9->wp0_used = 0;
	}
	else if (watchpoint->set == 2)
	{
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], 0x0);
		jtag_execute_queue();
		arm7_9->wp1_used = 0;
	}
	watchpoint->set = 0;

	return ERROR_OK;
}

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int arm7_9_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
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{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (arm7_9->wp_available < 1)
	{
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}
	
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	if ((watchpoint->length != 1) && (watchpoint->length != 2) && (watchpoint->length != 4))
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	{
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}
	
	arm7_9->wp_available--;
		
	return ERROR_OK;
}

int arm7_9_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (target->state != TARGET_HALTED)
	{
		WARNING("target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (watchpoint->set)
	{
		arm7_9_unset_watchpoint(target, watchpoint);
	}
		
	arm7_9->wp_available++;
	
	return ERROR_OK;
}

int arm7_9_enable_sw_bkpts(struct target_s *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	int retval;
	
	if (arm7_9->sw_bkpts_enabled)
		return ERROR_OK;
	
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	if (arm7_9->wp_available < 1)
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	{
		WARNING("can't enable sw breakpoints with no watchpoint unit available");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}
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	arm7_9->wp_available--;
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	if (!arm7_9->wp0_used)
	{
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_VALUE], arm7_9->arm_bkpt);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0x0);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0xffffffffu);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], ~EICE_W_CTRL_nOPC & 0xff);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], EICE_W_CTRL_ENABLE);
		arm7_9->sw_bkpts_enabled = 1;
		arm7_9->wp0_used = 3;
	}
	else if (!arm7_9->wp1_used)
	{
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_VALUE], arm7_9->arm_bkpt);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_MASK], 0x0);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_MASK], 0xffffffffu);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_MASK], ~EICE_W_CTRL_nOPC & 0xff);
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], EICE_W_CTRL_ENABLE);
		arm7_9->sw_bkpts_enabled = 2;
		arm7_9->wp1_used = 3;
	}
	else
	{
		ERROR("BUG: both watchpoints used, but wp_available >= 1");
		exit(-1);
	}
	
	if ((retval = jtag_execute_queue()) != ERROR_OK)
	{
		ERROR("error writing EmbeddedICE registers to enable sw breakpoints");
		exit(-1);
	};
	
	return ERROR_OK;
}

int arm7_9_disable_sw_bkpts(struct target_s *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	if (!arm7_9->sw_bkpts_enabled)
		return ERROR_OK;
	
	if (arm7_9->sw_bkpts_enabled == 1)
	{
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x0);
		arm7_9->sw_bkpts_enabled = 0;
		arm7_9->wp0_used = 0;
		arm7_9->wp_available++;
	}
	else if (arm7_9->sw_bkpts_enabled == 2)
	{
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], 0x0);
		arm7_9->sw_bkpts_enabled = 0;
		arm7_9->wp1_used = 0;
		arm7_9->wp_available++;
	}

	return ERROR_OK;
}

int arm7_9_execute_sys_speed(struct target_s *target)
{
	int timeout;
	int retval;
	
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	arm_jtag_t *jtag_info = &arm7_9->jtag_info;
	reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
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	/* set RESTART instruction */
	jtag_add_end_state(TAP_RTI);
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	arm_jtag_set_instr(jtag_info, 0x4, NULL);
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	for (timeout=0; timeout<50; timeout++)
	{
		/* read debug status register */
		embeddedice_read_reg(dbg_stat);
		if ((retval = jtag_execute_queue()) != ERROR_OK)
			return retval;
		if ((buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1))
				   && (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_SYSCOMP, 1)))
			break;
		usleep(100000);	
	}
	if (timeout == 50)
	{
		ERROR("timeout waiting for SYSCOMP & DBGACK, last DBG_STATUS: %x", buf_get_u32(dbg_stat->value, 0, dbg_stat->size));
		return ERROR_TARGET_TIMEOUT;
	}
	
	return ERROR_OK;
}

int arm7_9_execute_fast_sys_speed(struct target_s *target)
{
	u8 check_value[4], check_mask[4];
	
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	arm_jtag_t *jtag_info = &arm7_9->jtag_info;
	reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
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	/* set RESTART instruction */
	jtag_add_end_state(TAP_RTI);
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	arm_jtag_set_instr(jtag_info, 0x4, NULL);
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	/* check for DBGACK and SYSCOMP set (others don't care) */
	buf_set_u32(check_value, 0, 32, 0x9);
	buf_set_u32(check_mask, 0, 32, 0x9);
	
	/* read debug status register */
	embeddedice_read_reg_w_check(dbg_stat, check_value, check_value);

	return ERROR_OK;
}

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int arm7_9_target_request_data(target_t *target, u32 size, u8 *buffer)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	arm_jtag_t *jtag_info = &arm7_9->jtag_info;
	u32 *data;
	int i;
	
	data = malloc(size * (sizeof(u32)));
	
	embeddedice_receive(jtag_info, data, size);
	
	for (i = 0; i < size; i++)
	{
		h_u32_to_le(buffer + (i * 4), data[i]);
	}
	
	free(data);
	
	return ERROR_OK;
}

int arm7_9_handle_target_request(void *priv)
{
	target_t *target = priv;
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	arm_jtag_t *jtag_info = &arm7_9->jtag_info; 
	reg_t *dcc_control = &arm7_9->eice_cache->reg_list[EICE_COMMS_CTRL];
	
	if (target->state == TARGET_RUNNING)
	{
		/* read DCC control register */
		embeddedice_read_reg(dcc_control);
		jtag_execute_queue();
		
		/* check W bit */
		if (buf_get_u32(dcc_control->value, 1, 1) == 1)
		{
			u32 request;
			
			embeddedice_receive(jtag_info, &request, 1);
			target_request(target, request);
		}
	}
	
	return ERROR_OK;
}

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enum target_state arm7_9_poll(target_t *target)
{
	int retval;
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];

	if (arm7_9->reinit_embeddedice)
	{
		arm7_9_reinit_embeddedice(target);
	}
	
	/* read debug status register */
	embeddedice_read_reg(dbg_stat);
	if ((retval = jtag_execute_queue()) != ERROR_OK)
	{
		switch (retval)
		{
			case ERROR_JTAG_QUEUE_FAILED:
				ERROR("JTAG queue failed while reading EmbeddedICE status register");
				exit(-1);
				break;
			default:
				break;
		}
	}
	
	if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1))
	{
		DEBUG("DBGACK set, dbg_state->value: 0x%x", buf_get_u32(dbg_stat->value, 0, 32));
		if ((target->state == TARGET_UNKNOWN))
		{
			WARNING("DBGACK set while target was in unknown state. Reset or initialize target before resuming");
			target->state = TARGET_RUNNING;
		}
		if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
		{
			target->state = TARGET_HALTED;
			if ((retval = arm7_9_debug_entry(target)) != ERROR_OK)
				return retval;
			
			target_call_event_callbacks(target, TARGET_EVENT_HALTED);
		}
		if (target->state == TARGET_DEBUG_RUNNING)
		{
			target->state = TARGET_HALTED;
			if ((retval = arm7_9_debug_entry(target)) != ERROR_OK)
				return retval;
			
			target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
		}
	}
	else
	{
		if (target->state != TARGET_DEBUG_RUNNING)
			target->state = TARGET_RUNNING;
	}
	
	return target->state;
}

int arm7_9_assert_reset(target_t *target)
{
	int retval;
	
	DEBUG("target->state: %s", target_state_strings[target->state]);
	
	if (target->state == TARGET_HALTED || target->state == TARGET_UNKNOWN)
	{
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		/* if the target wasn't running, there might be working areas allocated */
		target_free_all_working_areas(target);
		
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		/* assert SRST and TRST */
		/* system would get ouf sync if we didn't reset test-logic, too */
		if ((retval = jtag_add_reset(1, 1)) != ERROR_OK)
		{
			if (retval == ERROR_JTAG_RESET_CANT_SRST)
			{
				WARNING("can't assert srst");
				return retval;
			}
			else
			{
				ERROR("unknown error");
				exit(-1);
			}
		}
		jtag_add_sleep(5000);
		if ((retval = jtag_add_reset(0, 1)) != ERROR_OK)
		{
			if (retval == ERROR_JTAG_RESET_WOULD_ASSERT_TRST)
			{
				WARNING("srst resets test logic, too");
				retval = jtag_add_reset(1, 1);
			}
		}
	}
	else
	{
		if ((retval = jtag_add_reset(0, 1)) != ERROR_OK)
		{
			if (retval == ERROR_JTAG_RESET_WOULD_ASSERT_TRST)
			{
				WARNING("srst resets test logic, too");
				retval = jtag_add_reset(1, 1);
			}
			
			if (retval == ERROR_JTAG_RESET_CANT_SRST)
			{
				WARNING("can't assert srst");
				return retval;
			}
			else if (retval != ERROR_OK)
			{
				ERROR("unknown error");
				exit(-1);
			}
		}
	}
	
	target->state = TARGET_RESET;
	jtag_add_sleep(50000);
	
	armv4_5_invalidate_core_regs(target);

	return ERROR_OK;

}

int arm7_9_deassert_reset(target_t *target)
{
	DEBUG("target->state: %s", target_state_strings[target->state]);
	
	/* deassert reset lines */
	jtag_add_reset(0, 0);
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	return ERROR_OK;
}

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int arm7_9_clear_halt(target_t *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
	
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	/* we used DBGRQ only if we didn't come out of reset */
	if (!arm7_9->debug_entry_from_reset && arm7_9->use_dbgrq)
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	{
		/* program EmbeddedICE Debug Control Register to deassert DBGRQ
		 */
		buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGRQ, 1, 0);	
		embeddedice_store_reg(dbg_ctrl);
	}
	else
	{
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		if (arm7_9->debug_entry_from_reset && arm7_9->has_vector_catch)
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		{
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			/* if we came out of reset, and vector catch is supported, we used
			 * vector catch to enter debug state
			 * restore the register in that case
			 */
			embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH]);
		}
		else
		{
			/* restore registers if watchpoint unit 0 was in use
			 */
			if (arm7_9->wp0_used)
			{
				embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK]);
				embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK]);
				embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK]);
			}
			/* control value always has to be restored, as it was either disabled, 
			 * or enabled with possibly different bits
			 */
			embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE]);
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		}
	}
	
	return ERROR_OK;
}

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int arm7_9_soft_reset_halt(struct target_s *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
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	reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
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	int i;
	
	if (target->state == TARGET_RUNNING)
	{
		target->type->halt(target);
	}
	
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	while (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
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	{
		embeddedice_read_reg(dbg_stat);
		jtag_execute_queue();
	}
	target->state = TARGET_HALTED;
	
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	/* program EmbeddedICE Debug Control Register to assert DBGACK and INTDIS
	 * ensure that DBGRQ is cleared
	 */
	buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGACK, 1, 1);
	buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGRQ, 1, 0);
	buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_INTDIS, 1, 1);
	embeddedice_store_reg(dbg_ctrl);
	
	arm7_9_clear_halt(target);
	
	/* if the target is in Thumb state, change to ARM state */
	if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_ITBIT, 1))
	{
		u32 r0_thumb, pc_thumb;
		DEBUG("target entered debug from Thumb state, changing to ARM");
		/* Entered debug from Thumb mode */
		armv4_5->core_state = ARMV4_5_STATE_THUMB;
		arm7_9->change_to_arm(target, &r0_thumb, &pc_thumb);
	}
	
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	/* all register content is now invalid */
	armv4_5_invalidate_core_regs(target);
	
	/* SVC, ARM state, IRQ and FIQ disabled */
	buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8, 0xd3);
	armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
	armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
	
	/* start fetching from 0x0 */
	buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, 0x0);
	armv4_5->core_cache->reg_list[15].dirty = 1;
	armv4_5->core_cache->reg_list[15].valid = 1;
	
	armv4_5->core_mode = ARMV4_5_MODE_SVC;
	armv4_5->core_state = ARMV4_5_STATE_ARM;
	
	/* reset registers */
	for (i = 0; i <= 14; i++)
	{	
		buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).value, 0, 32, 0xffffffff);
		ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).dirty = 1;
		ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).valid = 1;
	}
	
	target_call_event_callbacks(target, TARGET_EVENT_HALTED);
	
	return ERROR_OK;
}

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int arm7_9_prepare_reset_halt(target_t *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
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	/* poll the target, and resume if it was currently halted */
	arm7_9_poll(target);
	if (target->state == TARGET_HALTED)
	{
		arm7_9_resume(target, 1, 0x0, 0, 1);
	}
	
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	if (arm7_9->has_vector_catch)
	{
		/* program vector catch register to catch reset vector */
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0x1);
	}
	else
	{
		/* program watchpoint unit to match on reset vector address */
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0x3);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0x0);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x100);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xf7);
	}
	
	return ERROR_OK;
}

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int arm7_9_halt(target_t *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
	
	DEBUG("target->state: %s", target_state_strings[target->state]);
	
	if (target->state == TARGET_HALTED)
	{
		WARNING("target was already halted");
		return ERROR_TARGET_ALREADY_HALTED;
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	}
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	if (target->state == TARGET_UNKNOWN)
	{
		WARNING("target was in unknown state when halt was requested");
	}
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	if (target->state == TARGET_RESET) 
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	{
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		if ((jtag_reset_config & RESET_SRST_PULLS_TRST) && jtag_srst)
		{
			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 arm7_9_prepare_reset_halt()
			 */
			target->debug_reason = DBG_REASON_DBGRQ;
			
			return ERROR_OK; 
		}
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	}
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	if (arm7_9->use_dbgrq)
	{
		/* program EmbeddedICE Debug Control Register to assert DBGRQ
		 */
		buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGRQ, 1, 1);	
		embeddedice_store_reg(dbg_ctrl);
	}
	else
	{
		/* program watchpoint unit to match on any address
		 */
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0xffffffff);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x100);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xf7);
	}

	target->debug_reason = DBG_REASON_DBGRQ;
	
	return ERROR_OK;
}

int arm7_9_debug_entry(target_t *target)
{
	int i;
	u32 context[16];
	u32* context_p[16];
	u32 r0_thumb, pc_thumb;
	u32 cpsr;
	int retval;
	/* get pointers to arch-specific information */
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
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