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// SPDX-License-Identifier: GPL-2.0-or-later

/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007-2010 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 *                                                                         *
 *   Copyright (C) 2008 by Hongtao Zheng                                   *
 *   hontor@126.com                                                        *
 *                                                                         *
 *   Copyright (C) 2009 by David Brownell                                  *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "breakpoints.h"
#include "embeddedice.h"
#include "target_request.h"
#include "etm.h"
#include <helper/time_support.h>
#include "arm_simulator.h"
#include "arm_semihosting.h"
#include "algorithm.h"
#include "register.h"
#include "armv4_5.h"

/**
 * @file
 * Hold common code supporting the ARM7 and ARM9 core generations.
 *
 * While the ARM core implementations evolved substantially during these
 * two generations, they look quite similar from the JTAG perspective.
 * Both have similar debug facilities, based on the same two scan chains
 * providing access to the core and to an EmbeddedICE module.  Both can
 * support similar ETM and ETB modules, for tracing.  And both expose
 * what could be viewed as "ARM Classic", with multiple processor modes,
 * shadowed registers, and support for the Thumb instruction set.
 *
 * Processor differences include things like presence or absence of MMU
 * and cache, pipeline sizes, use of a modified Harvard Architecture
 * (with separate instruction and data buses from the CPU), support
 * for cpu clock gating during idle, and more.
 */

static int arm7_9_debug_entry(struct target *target);

/**
 * Clear watchpoints for an ARM7/9 target.
 *
 * @param arm7_9 Pointer to the common struct for an ARM7/9 target
 * @return JTAG error status after executing queue
 */
static int arm7_9_clear_watchpoints(struct arm7_9_common *arm7_9)
{
	LOG_DEBUG("-");
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x0);
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], 0x0);
	arm7_9->sw_breakpoint_count = 0;
	arm7_9->sw_breakpoints_added = 0;
	arm7_9->wp0_used = 0;
	arm7_9->wp1_used = arm7_9->wp1_used_default;
	arm7_9->wp_available = arm7_9->wp_available_max;

	return jtag_execute_queue();
}

/**
 * Assign a watchpoint to one of the two available hardware comparators in an
 * ARM7 or ARM9 target.
 *
 * @param arm7_9 Pointer to the common struct for an ARM7/9 target
 * @param breakpoint Pointer to the breakpoint to be used as a watchpoint
 */
static void arm7_9_assign_wp(struct arm7_9_common *arm7_9, struct breakpoint *breakpoint)
{
	if (!arm7_9->wp0_used) {
		arm7_9->wp0_used = 1;
		breakpoint_hw_set(breakpoint, 0);
		arm7_9->wp_available--;
	} else if (!arm7_9->wp1_used) {
		arm7_9->wp1_used = 1;
		breakpoint_hw_set(breakpoint, 1);
		arm7_9->wp_available--;
	} else {
		LOG_ERROR("BUG: no hardware comparator available");
	}

	LOG_DEBUG("BPID: %" PRIu32 " (0x%08" TARGET_PRIxADDR ") using hw wp: %u",
			breakpoint->unique_id,
			breakpoint->address,
			breakpoint->number);
}

/**
 * Setup an ARM7/9 target's embedded ICE registers for software breakpoints.
 *
 * @param arm7_9 Pointer to common struct for ARM7/9 targets
 * @return Error codes if there is a problem finding a watchpoint or the result
 * of executing the JTAG queue
 */
static int arm7_9_set_software_breakpoints(struct arm7_9_common *arm7_9)
{
	if (arm7_9->sw_breakpoints_added)
		return ERROR_OK;
	if (arm7_9->wp_available < 1) {
		LOG_WARNING("can't enable sw breakpoints with no watchpoint unit available");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}
	arm7_9->wp_available--;

	/* pick a breakpoint unit */
	if (!arm7_9->wp0_used) {
		arm7_9->sw_breakpoints_added = 1;
		arm7_9->wp0_used = 3;
	} else if (!arm7_9->wp1_used) {
		arm7_9->sw_breakpoints_added = 2;
		arm7_9->wp1_used = 3;
	} else {
		LOG_ERROR("BUG: both watchpoints used, but wp_available >= 1");
		return ERROR_FAIL;
	}

	if (arm7_9->sw_breakpoints_added == 1) {
		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);
	} else if (arm7_9->sw_breakpoints_added == 2) {
		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);
	} else {
		LOG_ERROR("BUG: both watchpoints used, but wp_available >= 1");
		return ERROR_FAIL;
	}
	LOG_DEBUG("SW BP using hw wp: %d",
		arm7_9->sw_breakpoints_added);

	return jtag_execute_queue();
}

/**
 * Setup the common pieces for an ARM7/9 target after reset or on startup.
 *
 * @param target Pointer to an ARM7/9 target to setup
 * @return Result of clearing the watchpoints on the target
 */
static int arm7_9_setup(struct target *target)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);

	return arm7_9_clear_watchpoints(arm7_9);
}

/**
 * Set either a hardware or software breakpoint on an ARM7/9 target.  The
 * breakpoint is set up even if it is already set.  Some actions, e.g. reset,
 * might have erased the values in Embedded ICE.
 *
 * @param target Pointer to the target device to set the breakpoints on
 * @param breakpoint Pointer to the breakpoint to be set
 * @return For hardware breakpoints, this is the result of executing the JTAG
 * queue.  For software breakpoints, this will be the status of the
 * required memory reads and writes
 */
static int arm7_9_set_breakpoint(struct target *target, struct breakpoint *breakpoint)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	int retval = ERROR_OK;

	LOG_DEBUG("BPID: %" PRIu32 ", Address: 0x%08" TARGET_PRIxADDR ", Type: %d",
		breakpoint->unique_id,
		breakpoint->address,
		breakpoint->type);

	if (target->state != TARGET_HALTED) {
		LOG_TARGET_ERROR(target, "not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	if (breakpoint->type == BKPT_HARD) {
		/* either an ARM (4 byte) or Thumb (2 byte) breakpoint */
		uint32_t mask = (breakpoint->length == 4) ? 0x3u : 0x1u;

		/* reassign a hw breakpoint */
		if (!breakpoint->is_set)
			arm7_9_assign_wp(arm7_9, breakpoint);

		if (breakpoint->number == 0) {
			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);
		} else if (breakpoint->number == 1) {
			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);
		} else {
			LOG_ERROR("BUG: no hardware comparator available");
			return ERROR_OK;
		}

		retval = jtag_execute_queue();
	} else if (breakpoint->type == BKPT_SOFT) {
		/* did we already set this breakpoint? */
		if (breakpoint->is_set)
			return ERROR_OK;

		if (breakpoint->length == 4) {
			uint32_t verify = 0xffffffff;
			/* keep the original instruction in target endianness */
			retval = target_read_memory(target, breakpoint->address, 4, 1, breakpoint->orig_instr);
			if (retval != ERROR_OK)
				return retval;
			/* write the breakpoint instruction in target
			 * endianness (arm7_9->arm_bkpt is host endian) */
			retval = target_write_u32(target, breakpoint->address, arm7_9->arm_bkpt);
			if (retval != ERROR_OK)
				return retval;

			retval = target_read_u32(target, breakpoint->address, &verify);
			if (retval != ERROR_OK)
				return retval;
			if (verify != arm7_9->arm_bkpt) {
				LOG_ERROR("Unable to set 32 bit software breakpoint at address %08" TARGET_PRIxADDR
						" - check that memory is read/writable", breakpoint->address);
				return ERROR_OK;
			}
		} else {
			uint16_t verify = 0xffff;
			/* keep the original instruction in target endianness */
			retval = target_read_memory(target, breakpoint->address, 2, 1, breakpoint->orig_instr);
			if (retval != ERROR_OK)
				return retval;
			/* write the breakpoint instruction in target
			 * endianness (arm7_9->thumb_bkpt is host endian) */
			retval = target_write_u16(target, breakpoint->address, arm7_9->thumb_bkpt);
			if (retval != ERROR_OK)
				return retval;

			retval = target_read_u16(target, breakpoint->address, &verify);
			if (retval != ERROR_OK)
				return retval;
			if (verify != arm7_9->thumb_bkpt) {
				LOG_ERROR("Unable to set thumb software breakpoint at address %08" TARGET_PRIxADDR
						" - check that memory is read/writable", breakpoint->address);
				return ERROR_OK;
			}
		}

		retval = arm7_9_set_software_breakpoints(arm7_9);
		if (retval != ERROR_OK)
			return retval;

		arm7_9->sw_breakpoint_count++;

		breakpoint->is_set = true;
	}

	return retval;
}

/**
 * Unsets an existing breakpoint on an ARM7/9 target.  If it is a hardware
 * breakpoint, the watchpoint used will be freed and the Embedded ICE registers
 * will be updated.  Otherwise, the software breakpoint will be restored to its
 * original instruction if it hasn't already been modified.
 *
 * @param target Pointer to ARM7/9 target to unset the breakpoint from
 * @param breakpoint Pointer to breakpoint to be unset
 * @return For hardware breakpoints, this is the result of executing the JTAG
 * queue.  For software breakpoints, this will be the status of the
 * required memory reads and writes
 */
static int arm7_9_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
{
	int retval = ERROR_OK;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);

	LOG_DEBUG("BPID: %" PRIu32 ", Address: 0x%08" TARGET_PRIxADDR,
		breakpoint->unique_id,
		breakpoint->address);

	if (!breakpoint->is_set) {
		LOG_WARNING("breakpoint not set");
		return ERROR_OK;
	}

	if (breakpoint->type == BKPT_HARD) {
		LOG_DEBUG("BPID: %" PRIu32 " Releasing hw wp: %d",
			breakpoint->unique_id,
			breakpoint->is_set);
		if (breakpoint->number == 0) {
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x0);
			arm7_9->wp0_used = 0;
			arm7_9->wp_available++;
		} else if (breakpoint->number == 1) {
			embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], 0x0);
			arm7_9->wp1_used = 0;
			arm7_9->wp_available++;
		}
		retval = jtag_execute_queue();
		breakpoint->is_set = false;
	} else {
		/* restore original instruction (kept in target endianness) */
		if (breakpoint->length == 4) {
			uint32_t current_instr;
			/* check that user program as not modified breakpoint instruction */
			retval = target_read_memory(target,
					breakpoint->address, 4, 1, (uint8_t *)&current_instr);
			if (retval != ERROR_OK)
				return retval;
			current_instr = target_buffer_get_u32(target, (uint8_t *)&current_instr);
			if (current_instr == arm7_9->arm_bkpt) {
				retval = target_write_memory(target,
						breakpoint->address, 4, 1, breakpoint->orig_instr);
				if (retval != ERROR_OK)
					return retval;
			}

		} else {
			uint16_t current_instr;
			/* check that user program as not modified breakpoint instruction */
			retval = target_read_memory(target,
					breakpoint->address, 2, 1, (uint8_t *)&current_instr);
			if (retval != ERROR_OK)
				return retval;
			current_instr = target_buffer_get_u16(target, (uint8_t *)&current_instr);
			if (current_instr == arm7_9->thumb_bkpt) {
				retval = target_write_memory(target,
						breakpoint->address, 2, 1, breakpoint->orig_instr);
				if (retval != ERROR_OK)
					return retval;
			}
		}

		if (--arm7_9->sw_breakpoint_count == 0) {
			/* We have removed the last sw breakpoint, clear the hw breakpoint we used
			 *to implement it */
			if (arm7_9->sw_breakpoints_added == 1)
				embeddedice_set_reg(&arm7_9->eice_cache->reg_list[
						EICE_W0_CONTROL_VALUE], 0);
			else if (arm7_9->sw_breakpoints_added == 2)
				embeddedice_set_reg(&arm7_9->eice_cache->reg_list[
						EICE_W1_CONTROL_VALUE], 0);
		}

		breakpoint->is_set = false;
	}

	return retval;
}

/**
 * Add a breakpoint to an ARM7/9 target.  This makes sure that there are no
 * dangling breakpoints and that the desired breakpoint can be added.
 *
 * @param target Pointer to the target ARM7/9 device to add a breakpoint to
 * @param breakpoint Pointer to the breakpoint to be added
 * @return An error status if there is a problem adding the breakpoint or the
 * result of setting the breakpoint
 */
int arm7_9_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);

	if (arm7_9->breakpoint_count == 0) {
		/* make sure we don't have any dangling breakpoints. This is vital upon
		 * GDB connect/disconnect
		 */
		arm7_9_clear_watchpoints(arm7_9);
	}

	if ((breakpoint->type == BKPT_HARD) && (arm7_9->wp_available < 1)) {
		LOG_INFO("no watchpoint unit available for hardware breakpoint");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}

	if ((breakpoint->length != 2) && (breakpoint->length != 4)) {
		LOG_INFO("only breakpoints of two (Thumb) or four (ARM) bytes length supported");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}

	if (breakpoint->type == BKPT_HARD)
		arm7_9_assign_wp(arm7_9, breakpoint);

	arm7_9->breakpoint_count++;

	return arm7_9_set_breakpoint(target, breakpoint);
}

/**
 * Removes a breakpoint from an ARM7/9 target.  This will make sure there are no
 * dangling breakpoints and updates available watchpoints if it is a hardware
 * breakpoint.
 *
 * @param target Pointer to the target to have a breakpoint removed
 * @param breakpoint Pointer to the breakpoint to be removed
 * @return Error status if there was a problem unsetting the breakpoint or the
 * watchpoints could not be cleared
 */
int arm7_9_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
{
	int retval = ERROR_OK;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);

	retval = arm7_9_unset_breakpoint(target, breakpoint);
	if (retval != ERROR_OK)
		return retval;

	if (breakpoint->type == BKPT_HARD)
		arm7_9->wp_available++;

	arm7_9->breakpoint_count--;
	if (arm7_9->breakpoint_count == 0) {
		/* make sure we don't have any dangling breakpoints */
		retval = arm7_9_clear_watchpoints(arm7_9);
		if (retval != ERROR_OK)
			return retval;
	}

	return ERROR_OK;
}

/**
 * Sets a watchpoint for an ARM7/9 target in one of the watchpoint units.  It is
 * considered a bug to call this function when there are no available watchpoint
 * units.
 *
 * @param target Pointer to an ARM7/9 target to set a watchpoint on
 * @param watchpoint Pointer to the watchpoint to be set
 * @return Error status if watchpoint set fails or the result of executing the
 * JTAG queue
 */
static int arm7_9_set_watchpoint(struct target *target, struct watchpoint *watchpoint)
{
	int retval = ERROR_OK;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	int rw_mask = 1;
	uint32_t mask;
	const uint32_t wp_data_mask = watchpoint->mask;

	mask = watchpoint->length - 1;

	if (target->state != TARGET_HALTED) {
		LOG_TARGET_ERROR(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],
			wp_data_mask);
		if (wp_data_mask != (uint32_t)WATCHPOINT_IGNORE_DATA_VALUE_MASK)
			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));

		retval = jtag_execute_queue();
		if (retval != ERROR_OK)
			return retval;
		watchpoint_set(watchpoint, 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],
			wp_data_mask);
		if (wp_data_mask != (uint32_t)WATCHPOINT_IGNORE_DATA_VALUE_MASK)
			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));

		retval = jtag_execute_queue();
		if (retval != ERROR_OK)
			return retval;
		watchpoint_set(watchpoint, 2);
		arm7_9->wp1_used = 2;
	} else {
		LOG_ERROR("BUG: no hardware comparator available");
		return ERROR_OK;
	}

	return ERROR_OK;
}

/**
 * Unset an existing watchpoint and clear the used watchpoint unit.
 *
 * @param target Pointer to the target to have the watchpoint removed
 * @param watchpoint Pointer to the watchpoint to be removed
 * @return Error status while trying to unset the watchpoint or the result of
 *         executing the JTAG queue
 */
static int arm7_9_unset_watchpoint(struct target *target, struct watchpoint *watchpoint)
{
	int retval = ERROR_OK;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);

	if (target->state != TARGET_HALTED) {
		LOG_TARGET_ERROR(target, "not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	if (!watchpoint->is_set) {
		LOG_WARNING("breakpoint not set");
		return ERROR_OK;
	}

	if (watchpoint->number == 1) {
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x0);
		retval = jtag_execute_queue();
		if (retval != ERROR_OK)
			return retval;
		arm7_9->wp0_used = 0;
	} else if (watchpoint->number == 2) {
		embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], 0x0);
		retval = jtag_execute_queue();
		if (retval != ERROR_OK)
			return retval;
		arm7_9->wp1_used = 0;
	}
	watchpoint->is_set = false;

	return ERROR_OK;
}

/**
 * Add a watchpoint to an ARM7/9 target.  If there are no watchpoint units
 * available, an error response is returned.
 *
 * @param target Pointer to the ARM7/9 target to add a watchpoint to
 * @param watchpoint Pointer to the watchpoint to be added
 * @return Error status while trying to add the watchpoint
 */
int arm7_9_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);

	if (arm7_9->wp_available < 1)
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;

	if ((watchpoint->length != 1) && (watchpoint->length != 2) && (watchpoint->length != 4))
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;

	arm7_9->wp_available--;

	return ERROR_OK;
}

/**
 * Remove a watchpoint from an ARM7/9 target.  The watchpoint will be unset and
 * the used watchpoint unit will be reopened.
 *
 * @param target Pointer to the target to remove a watchpoint from
 * @param watchpoint Pointer to the watchpoint to be removed
 * @return Result of trying to unset the watchpoint
 */
int arm7_9_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
{
	int retval = ERROR_OK;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);

	if (watchpoint->is_set) {
		retval = arm7_9_unset_watchpoint(target, watchpoint);
		if (retval != ERROR_OK)
			return retval;
	}

	arm7_9->wp_available++;

	return ERROR_OK;
}

/**
 * Restarts the target by sending a RESTART instruction and moving the JTAG
 * state to IDLE.  This includes a timeout waiting for DBGACK and SYSCOMP to be
 * asserted by the processor.
 *
 * @param target Pointer to target to issue commands to
 * @return Error status if there is a timeout or a problem while executing the
 * JTAG queue
 */
int arm7_9_execute_sys_speed(struct target *target)
{
	int retval;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm_jtag *jtag_info = &arm7_9->jtag_info;
	struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];

	/* set RESTART instruction */
	if (arm7_9->need_bypass_before_restart) {
		arm7_9->need_bypass_before_restart = 0;
		retval = arm_jtag_set_instr(jtag_info->tap, 0xf, NULL, TAP_IDLE);
		if (retval != ERROR_OK)
			return retval;
	}
	retval = arm_jtag_set_instr(jtag_info->tap, 0x4, NULL, TAP_IDLE);
	if (retval != ERROR_OK)
		return retval;

	int64_t then = timeval_ms();
	bool timeout;
	while (!(timeout = ((timeval_ms()-then) > 1000))) {
		/* read debug status register */
		embeddedice_read_reg(dbg_stat);
		retval = jtag_execute_queue();
		if (retval != 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;
		if (debug_level >= 3)
			alive_sleep(100);
		else
			keep_alive();
	}
	if (timeout) {
		LOG_ERROR("timeout waiting for SYSCOMP & DBGACK, last DBG_STATUS: %" PRIx32 "",
			buf_get_u32(dbg_stat->value, 0, dbg_stat->size));
		return ERROR_TARGET_TIMEOUT;
	}

	return ERROR_OK;
}

/**
 * Restarts the target by sending a RESTART instruction and moving the JTAG
 * state to IDLE.  This validates that DBGACK and SYSCOMP are set without
 * waiting until they are.
 *
 * @param target Pointer to the target to issue commands to
 * @return Always ERROR_OK
 */
static int arm7_9_execute_fast_sys_speed(struct target *target)
{
	static int set;
	static uint8_t check_value[4], check_mask[4];

	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm_jtag *jtag_info = &arm7_9->jtag_info;
	struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
	int retval;

	/* set RESTART instruction */
	if (arm7_9->need_bypass_before_restart) {
		arm7_9->need_bypass_before_restart = 0;
		retval = arm_jtag_set_instr(jtag_info->tap, 0xf, NULL, TAP_IDLE);
		if (retval != ERROR_OK)
			return retval;
	}
	retval = arm_jtag_set_instr(jtag_info->tap, 0x4, NULL, TAP_IDLE);
	if (retval != ERROR_OK)
		return retval;

	if (!set) {
		/* check for DBGACK and SYSCOMP set (others don't care) */

		/* NB! These are constants that must be available until after next jtag_execute() and
		 * we evaluate the values upon first execution in lieu of setting up these constants
		 * during early setup.
		 * */
		buf_set_u32(check_value, 0, 32, 0x9);
		buf_set_u32(check_mask, 0, 32, 0x9);
		set = 1;
	}

	/* read debug status register */
	embeddedice_read_reg_w_check(dbg_stat, check_value, check_mask);

	return ERROR_OK;
}

/**
 * Get some data from the ARM7/9 target.
 *
 * @param target Pointer to the ARM7/9 target to read data from
 * @param size The number of 32bit words to be read
 * @param buffer Pointer to the buffer that will hold the data
 * @return The result of receiving data from the Embedded ICE unit
 */
int arm7_9_target_request_data(struct target *target, uint32_t size, uint8_t *buffer)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm_jtag *jtag_info = &arm7_9->jtag_info;
	uint32_t *data;
	int retval = ERROR_OK;
	uint32_t i;

	data = malloc(size * (sizeof(uint32_t)));

	retval = embeddedice_receive(jtag_info, data, size);

	/* return the 32-bit ints in the 8-bit array */
	for (i = 0; i < size; i++)
		h_u32_to_le(buffer + (i * 4), data[i]);

	free(data);

	return retval;
}

/**
 * Handles requests to an ARM7/9 target.  If debug messaging is enabled, the
 * target is running and the DCC control register has the W bit high, this will
 * execute the request on the target.
 *
 * @param priv Void pointer expected to be a struct target pointer
 * @return ERROR_OK unless there are issues with the JTAG queue or when reading
 * from the Embedded ICE unit
 */
static int arm7_9_handle_target_request(void *priv)
{
	int retval = ERROR_OK;
	struct target *target = priv;
	if (!target_was_examined(target))
		return ERROR_OK;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm_jtag *jtag_info = &arm7_9->jtag_info;
	struct reg *dcc_control = &arm7_9->eice_cache->reg_list[EICE_COMMS_CTRL];

	if (!target->dbg_msg_enabled)
		return ERROR_OK;

	if (target->state == TARGET_RUNNING) {
		/* read DCC control register */
		embeddedice_read_reg(dcc_control);
		retval = jtag_execute_queue();
		if (retval != ERROR_OK)
			return retval;

		/* check W bit */
		if (buf_get_u32(dcc_control->value, 1, 1) == 1) {
			uint32_t request;

			retval = embeddedice_receive(jtag_info, &request, 1);
			if (retval != ERROR_OK)
				return retval;
			retval = target_request(target, request);
			if (retval != ERROR_OK)
				return retval;
		}
	}

	return ERROR_OK;
}

/**
 * Polls an ARM7/9 target for its current status.  If DBGACK is set, the target
 * is manipulated to the right halted state based on its current state.  This is
 * what happens:
 *
 * <table>
 *   <tr><th > State</th><th > Action</th></tr>
 *   <tr><td > TARGET_RUNNING | TARGET_RESET</td>
 *     <td > Enters debug mode.  If TARGET_RESET, pc may be checked</td></tr>
 *   <tr><td > TARGET_UNKNOWN</td><td > Warning is logged</td></tr>
 *   <tr><td > TARGET_DEBUG_RUNNING</td><td > Enters debug mode</td></tr>
 *   <tr><td > TARGET_HALTED</td><td > Nothing</td></tr>
 * </table>
 *
 * If the target does not end up in the halted state, a warning is produced.  If
 * DBGACK is cleared, then the target is expected to either be running or
 * running in debug.
 *
 * @param target Pointer to the ARM7/9 target to poll
 * @return ERROR_OK or an error status if a command fails
 */
int arm7_9_poll(struct target *target)
{
	int retval;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];

	/* read debug status register */
	embeddedice_read_reg(dbg_stat);
	retval = jtag_execute_queue();
	if (retval != ERROR_OK)
		return retval;

	if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1)) {
		/* LOG_DEBUG("DBGACK set, dbg_state->value: 0x%x", buf_get_u32(dbg_stat->value, 0, *32));*/
		if (target->state == TARGET_UNKNOWN) {
			/* Starting OpenOCD with target in debug-halt */
			target->state = TARGET_RUNNING;
			LOG_DEBUG("DBGACK already set during server startup.");
		}
		if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET)) {
			target->state = TARGET_HALTED;

			retval = arm7_9_debug_entry(target);
			if (retval != ERROR_OK)
				return retval;

			if (arm_semihosting(target, &retval) != 0)
				return retval;

			retval = target_call_event_callbacks(target, TARGET_EVENT_HALTED);
			if (retval != ERROR_OK)
				return retval;
		}
		if (target->state == TARGET_DEBUG_RUNNING) {
			target->state = TARGET_HALTED;
			retval = arm7_9_debug_entry(target);
			if (retval != ERROR_OK)
				return retval;

			retval = target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
			if (retval != ERROR_OK)
				return retval;
		}
		if (target->state != TARGET_HALTED)
			LOG_WARNING(
				"DBGACK set, but the target did not end up in the halted state %d",
				target->state);
	} else {
		if (target->state != TARGET_DEBUG_RUNNING)
			target->state = TARGET_RUNNING;
	}

	return ERROR_OK;
}

/**
 * Asserts the reset (SRST) on an ARM7/9 target.  Some -S targets (ARM966E-S in
 * the STR912 isn't affected, ARM926EJ-S in the LPC3180 and AT91SAM9260 is
 * affected) completely stop the JTAG clock while the core is held in reset
 * (SRST).  It isn't possible to program the halt condition once reset is
 * asserted, hence a hook that allows the target to set up its reset-halt
 * condition is setup prior to asserting reset.
 *
 * @param target Pointer to an ARM7/9 target to assert reset on
 * @return ERROR_FAIL if the JTAG device does not have SRST, otherwise ERROR_OK
 */
int arm7_9_assert_reset(struct target *target)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	enum reset_types jtag_reset_config = jtag_get_reset_config();
	bool use_event = false;

	/* TODO: apply hw reset signal in not examined state */
	if (!(target_was_examined(target))) {
		LOG_WARNING("Reset is not asserted because the target is not examined.");
		LOG_WARNING("Use a reset button or power cycle the target.");
		return ERROR_TARGET_NOT_EXAMINED;
	}

	LOG_DEBUG("target->state: %s", target_state_name(target));

	if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT))
		use_event = true;
	else if (!(jtag_reset_config & RESET_HAS_SRST)) {
		LOG_ERROR("%s: how to reset?", target_name(target));
		return ERROR_FAIL;
	}

	/* At this point trst has been asserted/deasserted once. We would
	 * like to program EmbeddedICE while SRST is asserted, instead of
	 * depending on SRST to leave that module alone.  However, many CPUs
	 * gate the JTAG clock while SRST is asserted; or JTAG may need
	 * clock stability guarantees (adaptive clocking might help).
	 *
	 * So we assume JTAG access during SRST is off the menu unless it's
	 * been specifically enabled.
	 */
	bool srst_asserted = false;

	if (!use_event && !(jtag_reset_config & RESET_SRST_PULLS_TRST)
			&& (jtag_reset_config & RESET_SRST_NO_GATING)) {
		jtag_add_reset(0, 1);
		srst_asserted = true;
	}

	if (target->reset_halt) {
		/*
		 * For targets that don't support communication while SRST is
		 * asserted, we need to set up the reset vector catch first.
		 *
		 * When we use TRST+SRST and that's equivalent to a power-up
		 * reset, these settings may well be reset anyway; so setting
		 * them here won't matter.
		 */
		if (arm7_9->has_vector_catch) {
			/* program vector catch register to catch reset */
			embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0x1);

			/* extra runtest added as issues were found with
			 * certain ARM9 cores (maybe more) - AT91SAM9260
			 * and STR9
			 */
			jtag_add_runtest(1, TAP_IDLE);
		} else {
			/* program watchpoint unit to match on reset vector
			 * address
			 */
			embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], 0x0);
			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], 0xffffffff);
			embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], EICE_W_CTRL_ENABLE);
			embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], ~EICE_W_CTRL_NOPC & 0xff);
		}
	}

	if (use_event)
		target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
	else {
		/* If we use SRST ... we'd like to issue just SRST, but the
		 * board or chip may be set up so we have to assert TRST as
		 * well.  On some chips that combination is equivalent to a
		 * power-up reset, and generally clobbers EICE state.
		 */
		if (jtag_reset_config & RESET_SRST_PULLS_TRST)
			jtag_add_reset(1, 1);
		else if (!srst_asserted)
			jtag_add_reset(0, 1);
		jtag_add_sleep(50000);
	}

	target->state = TARGET_RESET;
	register_cache_invalidate(arm7_9->arm.core_cache);

	/* REVISIT why isn't standard debug entry logic sufficient?? */
	if (target->reset_halt && (!(jtag_reset_config & RESET_SRST_PULLS_TRST) || use_event)) {
		/* debug entry was prepared above */
		target->debug_reason = DBG_REASON_DBGRQ;
	}

	return ERROR_OK;
}

/**
 * Deassert the reset (SRST) signal on an ARM7/9 target.  If SRST pulls TRST
 * and the target is being reset into a halt, a warning will be triggered
 * because it is not possible to reset into a halted mode in this case.  The
 * target is halted using the target's functions.
 *
 * @param target Pointer to the target to have the reset deasserted
 * @return ERROR_OK or an error from polling or halting the target
 */
int arm7_9_deassert_reset(struct target *target)
{
	int retval = ERROR_OK;
	LOG_DEBUG("target->state: %s", target_state_name(target));

	/* deassert reset lines */
	jtag_add_reset(0, 0);

	/* In case polling is disabled, we need to examine the
	 * target and poll here for this target to work correctly.
	 *
	 * Otherwise, e.g. halt will fail afterwards with bogus
	 * error messages as halt will believe that reset is
	 * still in effect.
	 */
	retval = target_examine_one(target);
	if (retval != ERROR_OK)
		return retval;

	retval = target_poll(target);
	if (retval != ERROR_OK)
		return retval;

	enum reset_types jtag_reset_config = jtag_get_reset_config();
	if (target->reset_halt && (jtag_reset_config & RESET_SRST_PULLS_TRST) != 0) {
		LOG_WARNING(
			"srst pulls trst - can not reset into halted mode. Issuing halt after reset.");
		retval = target_halt(target);
		if (retval != ERROR_OK)
			return retval;
	}
	return retval;
}

/**
 * Clears the halt condition for an ARM7/9 target.  If it isn't coming out of
 * reset and if DBGRQ is used, it is programmed to be deasserted.  If the reset
 * vector catch was used, it is restored.  Otherwise, the control value is
 * restored and the watchpoint unit is restored if it was in use.
 *
 * @param target Pointer to the ARM7/9 target to have halt cleared
 * @return Always ERROR_OK
 */
static int arm7_9_clear_halt(struct target *target)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct reg *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];

	/* we used DBGRQ only if we didn't come out of reset */
	if (!arm7_9->debug_entry_from_reset && arm7_9->use_dbgrq) {
		/* 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 {
		if (arm7_9->debug_entry_from_reset && arm7_9->has_vector_catch) {
			/* 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) {
				if (arm7_9->debug_entry_from_reset)
					embeddedice_store_reg(&arm7_9->eice_cache->reg_list[
							EICE_W0_ADDR_VALUE]);
				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]);
		}
	}

	return ERROR_OK;
}

/**
 * Issue a software reset and halt to an ARM7/9 target.  The target is halted
 * and then there is a wait until the processor shows the halt.  This wait can
 * timeout and results in an error being returned.  The software reset involves
 * clearing the halt, updating the debug control register, changing to ARM mode,
 * reset of the program counter, and reset of all of the registers.
 *
 * @param target Pointer to the ARM7/9 target to be reset and halted by software
 * @return Error status if any of the commands fail, otherwise ERROR_OK
 */
int arm7_9_soft_reset_halt(struct target *target)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm *arm = &arm7_9->arm;
	struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
	struct reg *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
	int i;
	int retval;

	/* FIX!!! replace some of this code with tcl commands
	 *
	 * halt # the halt command is synchronous
	 * armv4_5 core_state arm
	 *
	 */

	retval = target_halt(target);
	if (retval != ERROR_OK)
		return retval;

	long long then = timeval_ms();
	int timeout;
	while (!(timeout = ((timeval_ms()-then) > 1000))) {
		if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) != 0)
			break;
		embeddedice_read_reg(dbg_stat);
		retval = jtag_execute_queue();
		if (retval != ERROR_OK)
			return retval;
		if (debug_level >= 3)
			alive_sleep(100);
		else
			keep_alive();
	}
	if (timeout) {
		LOG_ERROR("Failed to halt CPU after 1 sec");
		return ERROR_TARGET_TIMEOUT;
	}
	target->state = TARGET_HALTED;

	/* 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);

	retval = arm7_9_clear_halt(target);
	if (retval != ERROR_OK)
		return retval;

	/* if the target is in Thumb state, change to ARM state */
	if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_ITBIT, 1)) {
		uint32_t r0_thumb, pc_thumb;
		LOG_DEBUG("target entered debug from Thumb state, changing to ARM");
		/* Entered debug from Thumb mode */
		arm->core_state = ARM_STATE_THUMB;
		arm7_9->change_to_arm(target, &r0_thumb, &pc_thumb);
	}

	/* REVISIT likewise for bit 5 -- switch Jazelle-to-ARM */

	/* all register content is now invalid */
	register_cache_invalidate(arm->core_cache);

	/* SVC, ARM state, IRQ and FIQ disabled */
	uint32_t cpsr;

	cpsr = buf_get_u32(arm->cpsr->value, 0, 32);
	cpsr &= ~0xff;
	cpsr |= 0xd3;
	arm_set_cpsr(arm, cpsr);
	arm->cpsr->dirty = true;

	/* start fetching from 0x0 */
	buf_set_u32(arm->pc->value, 0, 32, 0x0);
	arm->pc->dirty = true;
	arm->pc->valid = true;

	/* reset registers */
	for (i = 0; i <= 14; i++) {
		struct reg *r = arm_reg_current(arm, i);

		buf_set_u32(r->value, 0, 32, 0xffffffff);
		r->dirty = true;
		r->valid = true;
	}

	retval = target_call_event_callbacks(target, TARGET_EVENT_HALTED);
	if (retval != ERROR_OK)
		return retval;

	return ERROR_OK;
}

/**
 * Halt an ARM7/9 target.  This is accomplished by either asserting the DBGRQ
 * line or by programming a watchpoint to trigger on any address.  It is
 * considered a bug to call this function while the target is in the
 * TARGET_RESET state.
 *
 * @param target Pointer to the ARM7/9 target to be halted
 * @return Always ERROR_OK
 */
int arm7_9_halt(struct target *target)
{
	if (target->state == TARGET_RESET) {
		LOG_ERROR(
			"BUG: arm7/9 does not support halt during reset. This is handled in arm7_9_assert_reset()");
		return ERROR_OK;
	}

	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct reg *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];

	LOG_DEBUG("target->state: %s",
		target_state_name(target));

	if (target->state == TARGET_HALTED) {
		LOG_DEBUG("target was already halted");
		return ERROR_OK;
	}

	if (target->state == TARGET_UNKNOWN)
		LOG_WARNING("target was in unknown state when halt was requested");

	if (arm7_9->use_dbgrq) {
		/* program EmbeddedICE Debug Control Register to assert DBGRQ
		 */
		if (arm7_9->set_special_dbgrq)
			arm7_9->set_special_dbgrq(target);
		else {
			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],
			EICE_W_CTRL_ENABLE);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK],
			~EICE_W_CTRL_NOPC & 0xff);
	}

	target->debug_reason = DBG_REASON_DBGRQ;

	return ERROR_OK;
}

/**
 * Handle an ARM7/9 target's entry into debug mode.  The halt is cleared on the
 * ARM.  The JTAG queue is then executed and the reason for debug entry is
 * examined.  Once done, the target is verified to be halted and the processor
 * is forced into ARM mode.  The core registers are saved for the current core
 * mode and the program counter (register 15) is updated as needed.  The core
 * registers and CPSR and SPSR are saved for restoration later.
 *
 * @param target Pointer to target that is entering debug mode
 * @return Error code if anything fails, otherwise ERROR_OK
 */
static int arm7_9_debug_entry(struct target *target)
{
	int i;
	uint32_t context[16];
	uint32_t *context_p[16];
	uint32_t r0_thumb, pc_thumb;
	uint32_t cpsr, cpsr_mask = 0;
	int retval;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm *arm = &arm7_9->arm;
	struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
	struct reg *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];

#ifdef _DEBUG_ARM7_9_
	LOG_DEBUG("-");
#endif

	/* 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);

	retval = arm7_9_clear_halt(target);
	if (retval != ERROR_OK)
		return retval;

	retval = jtag_execute_queue();
	if (retval != ERROR_OK)
		return retval;

	retval = arm7_9->examine_debug_reason(target);
	if (retval != ERROR_OK)
		return retval;

	if (target->state != TARGET_HALTED) {
		LOG_TARGET_ERROR(target, "not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	/* if the target is in Thumb state, change to ARM state */
	if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_ITBIT, 1)) {
		LOG_DEBUG("target entered debug from Thumb state");
		/* Entered debug from Thumb mode */
		arm->core_state = ARM_STATE_THUMB;
		cpsr_mask = 1 << 5;
		arm7_9->change_to_arm(target, &r0_thumb, &pc_thumb);
		LOG_DEBUG("r0_thumb: 0x%8.8" PRIx32
			", pc_thumb: 0x%8.8" PRIx32, r0_thumb, pc_thumb);
	} else if (buf_get_u32(dbg_stat->value, 5, 1)) {
		/* \todo Get some vaguely correct handling of Jazelle, if
		 * anyone ever uses it and full info becomes available.
		 * See ARM9EJS TRM B.7.1 for how to switch J->ARM; and
		 * B.7.3 for the reverse.  That'd be the bare minimum...
		 */
		LOG_DEBUG("target entered debug from Jazelle state");
		arm->core_state = ARM_STATE_JAZELLE;
		cpsr_mask = 1 << 24;
		LOG_ERROR("Jazelle debug entry -- BROKEN!");
	} else {
		LOG_DEBUG("target entered debug from ARM state");
		/* Entered debug from ARM mode */
		arm->core_state = ARM_STATE_ARM;
	}

	for (i = 0; i < 16; i++)
		context_p[i] = &context[i];
	/* save core registers (r0 - r15 of current core mode) */
	arm7_9->read_core_regs(target, 0xffff, context_p);

	arm7_9->read_xpsr(target, &cpsr, 0);

	retval = jtag_execute_queue();
	if (retval != ERROR_OK)
		return retval;

	/* Sync our CPSR copy with J or T bits EICE reported, but
	 * which we then erased by putting the core into ARM mode.
	 */
	arm_set_cpsr(arm, cpsr | cpsr_mask);

	if (!is_arm_mode(arm->core_mode)) {
		target->state = TARGET_UNKNOWN;
		LOG_ERROR("cpsr contains invalid mode value - communication failure");
		return ERROR_TARGET_FAILURE;
	}

	LOG_DEBUG("target entered debug state in %s mode",
		arm_mode_name(arm->core_mode));

	if (arm->core_state == ARM_STATE_THUMB) {
		LOG_DEBUG("thumb state, applying fixups");
		context[0] = r0_thumb;
		context[15] = pc_thumb;
	} else if (arm->core_state == ARM_STATE_ARM) {
		/* adjust value stored by STM */
		context[15] -= 3 * 4;
	}

	if ((target->debug_reason != DBG_REASON_DBGRQ) || (!arm7_9->use_dbgrq))
		context[15] -= 3 * ((arm->core_state == ARM_STATE_ARM) ? 4 : 2);
	else
		context[15] -= arm7_9->dbgreq_adjust_pc *
			((arm->core_state == ARM_STATE_ARM) ? 4 : 2);

	for (i = 0; i <= 15; i++) {
		struct reg *r = arm_reg_current(arm, i);

		LOG_DEBUG("r%i: 0x%8.8" PRIx32 "", i, context[i]);

		buf_set_u32(r->value, 0, 32, context[i]);
		/* r0 and r15 (pc) have to be restored later */
		r->dirty = (i == 0) || (i == 15);
		r->valid = true;
	}

	LOG_DEBUG("entered debug state at PC 0x%" PRIx32 "", context[15]);

	/* exceptions other than USR & SYS have a saved program status register */
	if (arm->spsr) {
		uint32_t spsr;
		arm7_9->read_xpsr(target, &spsr, 1);
		retval = jtag_execute_queue();
		if (retval != ERROR_OK)
			return retval;
		buf_set_u32(arm->spsr->value, 0, 32, spsr);
		arm->spsr->dirty = false;
		arm->spsr->valid = true;
	}

	retval = jtag_execute_queue();
	if (retval != ERROR_OK)
		return retval;

	if (arm7_9->post_debug_entry) {
		retval = arm7_9->post_debug_entry(target);
		if (retval != ERROR_OK)
			return retval;
	}

	return ERROR_OK;
}

/**
 * Validate the full context for an ARM7/9 target in all processor modes.  If
 * there are any invalid registers for the target, they will all be read.  This
 * includes the PSR.
 *
 * @param target Pointer to the ARM7/9 target to capture the full context from
 * @return Error if the target is not halted, has an invalid core mode, or if
 *         the JTAG queue fails to execute
 */
static int arm7_9_full_context(struct target *target)
{
	int i;
	int retval;
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm *arm = &arm7_9->arm;
	struct {
		uint32_t value;
		uint8_t *reg_p;
	} read_cache[6 * (16 + 1)];
	int read_cache_idx = 0;

	LOG_DEBUG("-");

	if (target->state != TARGET_HALTED) {
		LOG_TARGET_ERROR(target, "not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	if (!is_arm_mode(arm->core_mode)) {
		LOG_ERROR("not a valid arm core mode - communication failure?");
		return ERROR_FAIL;
	}

	/* iterate through processor modes (User, FIQ, IRQ, SVC, ABT, UND)
	 * SYS shares registers with User, so we don't touch SYS
	 */
	for (i = 0; i < 6; i++) {
		uint32_t mask = 0;
		uint32_t *reg_p[16];
		int j;
		bool valid = true;

		/* check if there are invalid registers in the current mode
		 */
		for (j = 0; j <= 16; j++) {
			if (!ARMV4_5_CORE_REG_MODE(arm->core_cache, armv4_5_number_to_mode(i), j).valid)
				valid = false;
		}

		if (!valid) {
			uint32_t tmp_cpsr;

			/* change processor mode (and mask T bit) */
			tmp_cpsr = buf_get_u32(arm->cpsr->value, 0, 8)
				& 0xe0;
			tmp_cpsr |= armv4_5_number_to_mode(i);
			tmp_cpsr &= ~0x20;
			arm7_9->write_xpsr_im8(target, tmp_cpsr & 0xff, 0, 0);

			for (j = 0; j < 15; j++) {
				if (!ARMV4_5_CORE_REG_MODE(arm->core_cache,
						armv4_5_number_to_mode(i), j).valid) {
					read_cache[read_cache_idx].reg_p = ARMV4_5_CORE_REG_MODE(
							arm->core_cache,
							armv4_5_number_to_mode(i),
							j).value;
					reg_p[j] = &read_cache[read_cache_idx].value;
					read_cache_idx++;
					mask |= 1 << j;
					ARMV4_5_CORE_REG_MODE(arm->core_cache,
						armv4_5_number_to_mode(i),
						j).valid = true;
					ARMV4_5_CORE_REG_MODE(arm->core_cache,
						armv4_5_number_to_mode(i),
						j).dirty = false;
				}
			}

			/* if only the PSR is invalid, mask is all zeroes */
			if (mask)
				arm7_9->read_core_regs(target, mask, reg_p);

			/* check if the PSR has to be read */
			if (!ARMV4_5_CORE_REG_MODE(arm->core_cache, armv4_5_number_to_mode(i),
					16).valid) {
				read_cache[read_cache_idx].reg_p = ARMV4_5_CORE_REG_MODE(arm->core_cache,
					armv4_5_number_to_mode(i), 16).value;
				arm7_9->read_xpsr(target, &read_cache[read_cache_idx].value, 1);
				read_cache_idx++;
				ARMV4_5_CORE_REG_MODE(arm->core_cache, armv4_5_number_to_mode(i),
					16).valid = true;
				ARMV4_5_CORE_REG_MODE(arm->core_cache, armv4_5_number_to_mode(i),
					16).dirty = false;
			}
		}
	}

	/* restore processor mode (mask T bit) */
	arm7_9->write_xpsr_im8(target,
		buf_get_u32(arm->cpsr->value, 0, 8) & ~0x20, 0, 0);

	retval = jtag_execute_queue();
	if (retval != ERROR_OK)
		return retval;
	/*
	 * FIXME: regs in cache should be tagged as 'valid' only now,
	 * not before the jtag_execute_queue()
	 */
	while (read_cache_idx) {
		read_cache_idx--;
		buf_set_u32(read_cache[read_cache_idx].reg_p, 0, 32, read_cache[read_cache_idx].value);
	}
	return ERROR_OK;
}

/**
 * Restore the processor context on an ARM7/9 target.  The full processor
 * context is analyzed to see if any of the registers are dirty on this end, but
 * have a valid new value.  If this is the case, the processor is changed to the
 * appropriate mode and the new register values are written out to the
 * processor.  If there happens to be a dirty register with an invalid value, an
 * error will be logged.
 *
 * @param target Pointer to the ARM7/9 target to have its context restored
 * @return Error status if the target is not halted or the core mode in the
 * armv4_5 struct is invalid.
 */
static int arm7_9_restore_context(struct target *target)
{
	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
	struct arm *arm = &arm7_9->arm;
	struct reg *reg;
	enum arm_mode current_mode = arm->core_mode;
	int i, j;
	bool dirty;
	int mode_change;

	LOG_DEBUG("-");


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